Fix config passed to deepseek_eagle

Signed-off-by: Tyler Michael Smith <tlrmchlsmth@gmail.com>

.buildkite/release-pipeline.yaml

@@ -76,7 +76,7 @@ steps:
       queue: arm64_cpu_queue_postmerge
     commands:
       - "aws ecr-public get-login-password --region us-east-1 | docker login --username AWS --password-stdin public.ecr.aws/q9t5s3a7"
-      - "DOCKER_BUILDKIT=1 docker build --build-arg max_jobs=16 --build-arg USE_SCCACHE=1 --build-arg GIT_REPO_CHECK=1 --build-arg CUDA_VERSION=12.9.1 --build-arg torch_cuda_arch_list='8.7 9.0 10.0+PTX 12.0' --build-arg INSTALL_KV_CONNECTORS=true --tag public.ecr.aws/q9t5s3a7/vllm-release-repo:$BUILDKITE_COMMIT-$(uname -m) --target vllm-openai --progress plain -f docker/Dockerfile ."
+      - "DOCKER_BUILDKIT=1 docker build --build-arg max_jobs=16 --build-arg USE_SCCACHE=1 --build-arg GIT_REPO_CHECK=1 --build-arg CUDA_VERSION=12.9.1 --build-arg FLASHINFER_AOT_COMPILE=true --build-arg torch_cuda_arch_list='8.7 9.0 10.0+PTX 12.0' --build-arg INSTALL_KV_CONNECTORS=true --tag public.ecr.aws/q9t5s3a7/vllm-release-repo:$BUILDKITE_COMMIT-$(uname -m) --target vllm-openai --progress plain -f docker/Dockerfile ."
       - "docker push public.ecr.aws/q9t5s3a7/vllm-release-repo:$BUILDKITE_COMMIT-$(uname -m)"
 
   # Add job to create multi-arch manifest

.buildkite/scripts/hardware_ci/run-xpu-test.sh

@@ -42,9 +42,8 @@ docker run \
     pytest -v -s v1/sample --ignore=v1/sample/test_logprobs.py --ignore=v1/sample/test_logprobs_e2e.py
     pytest -v -s v1/worker --ignore=v1/worker/test_gpu_model_runner.py
     pytest -v -s v1/structured_output
-    pytest -v -s v1/spec_decode --ignore=v1/spec_decode/test_max_len.py --ignore=v1/spec_decode/test_eagle.py --ignore=v1/spec_decode/test_tree_attention.py
+    pytest -v -s v1/spec_decode --ignore=v1/spec_decode/test_max_len.py --ignore=v1/spec_decode/test_tree_attention.py
     pytest -v -s v1/kv_connector/unit --ignore=v1/kv_connector/unit/test_multi_connector.py --ignore=v1/kv_connector/unit/test_nixl_connector.py --ignore=v1/kv_connector/unit/test_shared_storage_connector.py
+    pytest -v -s v1/test_metrics
     pytest -v -s v1/test_serial_utils.py
-    pytest -v -s v1/test_utils.py
-    pytest -v -s v1/test_metrics_reader.py
 '

.buildkite/test-pipeline.yaml

@@ -159,10 +159,7 @@ steps:
   - examples/offline_inference/rlhf.py
   - examples/offline_inference/rlhf_colocate.py
   - tests/examples/offline_inference/data_parallel.py
-  - tests/v1/test_async_llm_dp.py
-  - tests/v1/test_external_lb_dp.py
-  - tests/v1/test_internal_lb_dp.py
-  - tests/v1/test_hybrid_lb_dp.py
+  - tests/v1/distributed
   - tests/v1/engine/test_engine_core_client.py
   - tests/distributed/test_symm_mem_allreduce.py
   commands:
@@ -180,10 +177,10 @@ steps:
   - TP_SIZE=2 DP_SIZE=2 ENABLE_EP=1 torchrun --nproc-per-node=4 distributed/test_torchrun_example_moe.py
   # test with internal dp
   - python3 ../examples/offline_inference/data_parallel.py --enforce-eager
-  - TP_SIZE=2 DP_SIZE=2 pytest -v -s v1/test_async_llm_dp.py
-  - TP_SIZE=2 DP_SIZE=2 pytest -v -s v1/test_external_lb_dp.py
-  - TP_SIZE=1 DP_SIZE=4 pytest -v -s v1/test_internal_lb_dp.py
-  - TP_SIZE=1 DP_SIZE=4 pytest -v -s v1/test_hybrid_lb_dp.py
+  - TP_SIZE=2 DP_SIZE=2 pytest -v -s v1/distributed/test_async_llm_dp.py
+  - TP_SIZE=2 DP_SIZE=2 pytest -v -s v1/distributed/test_external_lb_dp.py
+  - TP_SIZE=1 DP_SIZE=4 pytest -v -s v1/distributed/test_internal_lb_dp.py
+  - TP_SIZE=1 DP_SIZE=4 pytest -v -s v1/distributed/test_hybrid_lb_dp.py
   - pytest -v -s v1/engine/test_engine_core_client.py::test_kv_cache_events_dp
   - pytest -v -s distributed/test_utils.py
   - pytest -v -s compile/test_basic_correctness.py
@@ -300,12 +297,9 @@ steps:
     - pytest -v -s v1/spec_decode
     - pytest -v -s v1/kv_connector/unit
     - pytest -v -s v1/metrics
-    - pytest -v -s v1/test_kv_sharing.py
-    - pytest -v -s v1/test_metrics_reader.py
     - pytest -v -s v1/test_oracle.py
     - pytest -v -s v1/test_request.py
     - pytest -v -s v1/test_serial_utils.py
-    - pytest -v -s v1/test_utils.py
     # Integration test for streaming correctness (requires special branch).
     - pip install -U git+https://github.com/robertgshaw2-redhat/lm-evaluation-harness.git@streaming-api
     - pytest -v -s entrypoints/openai/correctness/test_lmeval.py::test_lm_eval_accuracy_v1_engine
@@ -465,29 +459,18 @@ steps:
   commands:
     - pytest -v -s kernels/mamba
 
-- label: Tensorizer Test # 14min
-  timeout_in_minutes: 25
-  mirror_hardwares: [amdexperimental]
-  source_file_dependencies:
-  - vllm/model_executor/model_loader
-  - tests/tensorizer_loader
-  - tests/entrypoints/openai/test_tensorizer_entrypoint.py
-  commands:
-    - apt-get update && apt-get install -y curl libsodium23
-    - export VLLM_WORKER_MULTIPROC_METHOD=spawn
-    - pytest -v -s tensorizer_loader
-    - pytest -v -s entrypoints/openai/test_tensorizer_entrypoint.py
-
-- label: Model Executor Test # 7min
-  timeout_in_minutes: 20
+- label: Model Executor Test # 23min
+  timeout_in_minutes: 35
   mirror_hardwares: [amdexperimental]
   source_file_dependencies:
   - vllm/model_executor
   - tests/model_executor
+  - tests/entrypoints/openai/test_tensorizer_entrypoint.py
   commands:
     - apt-get update && apt-get install -y curl libsodium23
     - export VLLM_WORKER_MULTIPROC_METHOD=spawn
     - pytest -v -s model_executor
+    - pytest -v -s entrypoints/openai/test_tensorizer_entrypoint.py
 
 - label: Benchmarks # 11min
   timeout_in_minutes: 20
@@ -522,7 +505,7 @@ steps:
   # https://github.com/pytorch/ao/issues/2919, we'll have to skip new torchao tests for now
   # we can only upgrade after this is resolved
   - pip install --pre torchao==0.13.0.dev20250814 --index-url https://download.pytorch.org/whl/nightly/cu128
-  - VLLM_TEST_FORCE_LOAD_FORMAT=auto pytest -v -s quantization
+  - VLLM_TEST_FORCE_LOAD_FORMAT=auto pytest -v -s quantization/
 
 - label: LM Eval Small Models # 53min
   timeout_in_minutes: 75
@@ -769,6 +752,7 @@ steps:
   commands:
     - pip install --upgrade git+https://github.com/huggingface/transformers
     - pytest -v -s tests/models/test_initialization.py
+    - pytest -v -s tests/models/test_transformers.py
     - pytest -v -s tests/models/multimodal/processing/
     - pytest -v -s tests/models/multimodal/test_mapping.py
     - python3 examples/offline_inference/basic/chat.py
@@ -830,6 +814,23 @@ steps:
     - uv pip install --system 'gpt-oss[eval]==0.0.5'
     - pytest -s -v tests/evals/gpt_oss/test_gpqa_correctness.py --model openai/gpt-oss-20b --metric 0.58 --server-args '--tensor-parallel-size 2'
 
+- label: Blackwell Quantized MoE Test
+  timeout_in_minutes: 60
+  working_dir: "/vllm-workspace/"
+  gpu: b200
+  source_file_dependencies:
+  - tests/quantization/test_blackwell_moe.py
+  - vllm/model_executor/models/deepseek_v2.py
+  - vllm/model_executor/models/gpt_oss.py
+  - vllm/model_executor/models/llama4.py
+  - vllm/model_executor/layers/fused_moe
+  - vllm/model_executor/layers/quantization/compressed_tensors
+  - vllm/model_executor/layers/quantization/modelopt.py
+  - vllm/model_executor/layers/quantization/mxfp4.py
+  - vllm/v1/attention/backends/flashinfer.py
+  commands:
+    - pytest -s -v tests/quantization/test_blackwell_moe.py
+
 #####  1 GPU test  #####
 #####  multi gpus test  #####
 
@@ -889,14 +890,13 @@ steps:
   - tests/compile/test_wrapper.py
   - tests/distributed/
   - tests/entrypoints/llm/test_collective_rpc.py
-  - tests/v1/test_async_llm_dp.py
-  - tests/v1/test_external_lb_dp.py
+  - tests/v1/distributed
   - tests/v1/entrypoints/openai/test_multi_api_servers.py
   - tests/v1/shutdown
   - tests/v1/worker/test_worker_memory_snapshot.py
   commands:
-  - TP_SIZE=1 DP_SIZE=2 pytest -v -s v1/test_async_llm_dp.py
-  - TP_SIZE=1 DP_SIZE=2 pytest -v -s v1/test_external_lb_dp.py
+  - TP_SIZE=1 DP_SIZE=2 pytest -v -s v1/distributed/test_async_llm_dp.py
+  - TP_SIZE=1 DP_SIZE=2 pytest -v -s v1/distributed/test_external_lb_dp.py
   - DP_SIZE=2 pytest -v -s v1/entrypoints/openai/test_multi_api_servers.py
   - pytest -v -s entrypoints/llm/test_collective_rpc.py
   - pytest -v -s ./compile/test_basic_correctness.py

.github/CODEOWNERS

@@ -12,8 +12,6 @@
 /vllm/model_executor/layers/mamba @tdoublep
 /vllm/model_executor/model_loader @22quinn
 /vllm/multimodal @DarkLight1337 @ywang96 @NickLucche
-/vllm/v1/attention @LucasWilkinson
-/vllm/v1/sample @22quinn @houseroad
 /vllm/vllm_flash_attn @LucasWilkinson
 /vllm/lora @jeejeelee
 /vllm/reasoning @aarnphm @chaunceyjiang
@@ -28,11 +26,13 @@ CMakeLists.txt @tlrmchlsmth @LucasWilkinson
 
 # vLLM V1
 /vllm/v1 @WoosukKwon @robertgshaw2-redhat @njhill @ywang96 @comaniac @alexm-redhat
-/vllm/v1/structured_output @mgoin @russellb @aarnphm @benchislett
-/vllm/v1/spec_decode @benchislett @luccafong
+/vllm/v1/attention @LucasWilkinson
 /vllm/v1/attention/backends/flashinfer.py @mgoin
 /vllm/v1/attention/backends/triton_attn.py @tdoublep
 /vllm/v1/core @WoosukKwon @robertgshaw2-redhat @njhill @ywang96 @comaniac @alexm-redhat @heheda12345 @ApostaC
+/vllm/v1/sample @22quinn @houseroad @njhill
+/vllm/v1/spec_decode @benchislett @luccafong
+/vllm/v1/structured_output @mgoin @russellb @aarnphm @benchislett
 /vllm/v1/kv_cache_interface.py @heheda12345
 /vllm/v1/offloading @ApostaC
 
@@ -54,7 +54,7 @@ CMakeLists.txt @tlrmchlsmth @LucasWilkinson
 /tests/weight_loading @mgoin @youkaichao @yewentao256
 /tests/lora @jeejeelee
 /tests/models/language/generation/test_hybrid.py @tdoublep
-/tests/v1/kv_connector/nixl_integration @NickLucche 
+/tests/v1/kv_connector/nixl_integration @NickLucche
 /tests/v1/kv_connector @ApostaC
 /tests/v1/offloading @ApostaC
 

.github/mergify.yml

@@ -274,7 +274,7 @@ pull_request_rules:
       - files~=^vllm/model_executor/model_loader/tensorizer.py
       - files~=^vllm/model_executor/model_loader/tensorizer_loader.py
       - files~=^tests/entrypoints/openai/test_tensorizer_entrypoint.py
-      - files~=^tests/tensorizer_loader/
+      - files~=^tests/model_executor/model_loader/tensorizer_loader/
   actions:
     assign:
       users:

README.md

@@ -21,6 +21,7 @@ Join us at the [PyTorch Conference, October 22-23](https://events.linuxfoundatio
 
 *Latest News* 🔥
 
+- [2025/09] We hosted [vLLM Toronto Meetup](https://luma.com/e80e0ymm) focused on tackling inference at scale and speculative decoding with speakers from NVIDIA and Red Hat! Please find the meetup slides [here](https://docs.google.com/presentation/d/1IYJYmJcu9fLpID5N5RbW_vO0XLo0CGOR14IXOjB61V8/edit?usp=sharing).
 - [2025/08] We hosted [vLLM Shenzhen Meetup](https://mp.weixin.qq.com/s/k8ZBO1u2_2odgiKWH_GVTQ) focusing on the ecosystem around vLLM! Please find the meetup slides [here](https://drive.google.com/drive/folders/1Ua2SVKVSu-wp5vou_6ElraDt2bnKhiEA).
 - [2025/08] We hosted [vLLM Singapore Meetup](https://www.sginnovate.com/event/vllm-sg-meet). We shared V1 updates, disaggregated serving and MLLM speedups with speakers from Embedded LLM, AMD, WekaIO, and A*STAR. Please find the meetup slides [here](https://drive.google.com/drive/folders/1ncf3GyqLdqFaB6IeB834E5TZJPLAOiXZ?usp=sharing).
 - [2025/08] We hosted [vLLM Shanghai Meetup](https://mp.weixin.qq.com/s/pDmAXHcN7Iqc8sUKgJgGtg) focusing on building, developing, and integrating with vLLM! Please find the meetup slides [here](https://drive.google.com/drive/folders/1OvLx39wnCGy_WKq8SiVKf7YcxxYI3WCH).

cmake/external_projects/flashmla.cmake

@@ -18,8 +18,8 @@ if(FLASH_MLA_SRC_DIR)
 else()
   FetchContent_Declare(
         flashmla
-        GIT_REPOSITORY https://github.com/vllm-project/FlashMLA.git
-        GIT_TAG a757314c04eedd166e329e846c820eb1bdd702de
+        GIT_REPOSITORY https://github.com/vllm-project/FlashMLA
+        GIT_TAG 5f65b85703c7ed75fda01e06495077caad207c3f
         GIT_PROGRESS TRUE
         CONFIGURE_COMMAND ""
         BUILD_COMMAND ""
@@ -33,23 +33,64 @@ message(STATUS "FlashMLA is available at ${flashmla_SOURCE_DIR}")
 # The FlashMLA kernels only work on hopper and require CUDA 12.3 or later.
 # Only build FlashMLA kernels if we are building for something compatible with 
 # sm90a
-cuda_archs_loose_intersection(FLASH_MLA_ARCHS "9.0a" "${CUDA_ARCHS}")
-if(${CMAKE_CUDA_COMPILER_VERSION} VERSION_GREATER 12.3 AND FLASH_MLA_ARCHS)
+
+set(SUPPORT_ARCHS)
+if(${CMAKE_CUDA_COMPILER_VERSION} VERSION_GREATER 12.3)
+    list(APPEND SUPPORT_ARCHS 9.0a)
+endif()
+if(${CMAKE_CUDA_COMPILER_VERSION} VERSION_GREATER 12.8)
+    list(APPEND SUPPORT_ARCHS 10.0a)
+endif()
+
+
+cuda_archs_loose_intersection(FLASH_MLA_ARCHS "${SUPPORT_ARCHS}" "${CUDA_ARCHS}")
+if(FLASH_MLA_ARCHS)
+    set(VLLM_FLASHMLA_GPU_FLAGS ${VLLM_GPU_FLAGS})
+    list(APPEND VLLM_FLASHMLA_GPU_FLAGS "--expt-relaxed-constexpr" "--expt-extended-lambda" "--use_fast_math")
+
     set(FlashMLA_SOURCES
-        ${flashmla_SOURCE_DIR}/csrc/flash_api.cpp
-        ${flashmla_SOURCE_DIR}/csrc/kernels/get_mla_metadata.cu
-        ${flashmla_SOURCE_DIR}/csrc/kernels/mla_combine.cu
-        ${flashmla_SOURCE_DIR}/csrc/kernels/splitkv_mla.cu
-        ${flashmla_SOURCE_DIR}/csrc/kernels_fp8/flash_fwd_mla_fp8_sm90.cu)
+        ${flashmla_SOURCE_DIR}/csrc/torch_api.cpp
+        ${flashmla_SOURCE_DIR}/csrc/pybind.cpp
+        ${flashmla_SOURCE_DIR}/csrc/smxx/get_mla_metadata.cu
+        ${flashmla_SOURCE_DIR}/csrc/smxx/mla_combine.cu
+        ${flashmla_SOURCE_DIR}/csrc/sm90/decode/dense/splitkv_mla.cu
+        ${flashmla_SOURCE_DIR}/csrc/sm90/decode/sparse_fp8/splitkv_mla.cu
+        ${flashmla_SOURCE_DIR}/csrc/sm90/prefill/sparse/fwd.cu
+        ${flashmla_SOURCE_DIR}/csrc/sm100/decode/sparse_fp8/splitkv_mla.cu
+        ${flashmla_SOURCE_DIR}/csrc/sm100/prefill/dense/fmha_cutlass_fwd_sm100.cu
+        ${flashmla_SOURCE_DIR}/csrc/sm100/prefill/dense/fmha_cutlass_bwd_sm100.cu
+        ${flashmla_SOURCE_DIR}/csrc/sm100/prefill/sparse/fwd.cu
+    )
+
+    set(FlashMLA_Extension_SOURCES
+        ${flashmla_SOURCE_DIR}/csrc/extension/torch_api.cpp
+        ${flashmla_SOURCE_DIR}/csrc/extension/sm90/dense_fp8/pybind.cpp
+        ${flashmla_SOURCE_DIR}/csrc/extension/sm90/dense_fp8/flash_fwd_mla_fp8_sm90.cu
+    )
 
     set(FlashMLA_INCLUDES
+        ${flashmla_SOURCE_DIR}/csrc
+        ${flashmla_SOURCE_DIR}/csrc/sm90
         ${flashmla_SOURCE_DIR}/csrc/cutlass/include
-        ${flashmla_SOURCE_DIR}/csrc)
+        ${flashmla_SOURCE_DIR}/csrc/cutlass/tools/util/include
+    )
+
+    set(FlashMLA_Extension_INCLUDES
+        ${flashmla_SOURCE_DIR}/csrc
+        ${flashmla_SOURCE_DIR}/csrc/sm90
+        ${flashmla_SOURCE_DIR}/csrc/extension/sm90/dense_fp8/
+        ${flashmla_SOURCE_DIR}/csrc/cutlass/include
+        ${flashmla_SOURCE_DIR}/csrc/cutlass/tools/util/include
+    )
 
     set_gencode_flags_for_srcs(
         SRCS "${FlashMLA_SOURCES}"
         CUDA_ARCHS "${FLASH_MLA_ARCHS}")
 
+    set_gencode_flags_for_srcs(
+        SRCS "${FlashMLA_Extension_SOURCES}"
+        CUDA_ARCHS "${FLASH_MLA_ARCHS}")
+
     define_gpu_extension_target(
         _flashmla_C
         DESTINATION vllm
@@ -60,8 +101,32 @@ if(${CMAKE_CUDA_COMPILER_VERSION} VERSION_GREATER 12.3 AND FLASH_MLA_ARCHS)
         INCLUDE_DIRECTORIES ${FlashMLA_INCLUDES}
         USE_SABI 3
         WITH_SOABI)
+
+    # Keep Stable ABI for the module, but *not* for CUDA/C++ files.
+    # This prevents Py_LIMITED_API from affecting nvcc and C++ compiles.
+    target_compile_options(_flashmla_C PRIVATE
+        $<$<COMPILE_LANGUAGE:CUDA>:-UPy_LIMITED_API>
+        $<$<COMPILE_LANGUAGE:CXX>:-UPy_LIMITED_API>)
+
+    define_gpu_extension_target(
+        _flashmla_extension_C
+        DESTINATION vllm
+        LANGUAGE ${VLLM_GPU_LANG}
+        SOURCES ${FlashMLA_Extension_SOURCES}
+        COMPILE_FLAGS ${VLLM_FLASHMLA_GPU_FLAGS}
+        ARCHITECTURES ${VLLM_GPU_ARCHES}
+        INCLUDE_DIRECTORIES ${FlashMLA_Extension_INCLUDES}
+        USE_SABI 3
+        WITH_SOABI)
+
+    # Keep Stable ABI for the module, but *not* for CUDA/C++ files.
+    # This prevents Py_LIMITED_API from affecting nvcc and C++ compiles.
+    target_compile_options(_flashmla_extension_C PRIVATE
+        $<$<COMPILE_LANGUAGE:CUDA>:-UPy_LIMITED_API>
+        $<$<COMPILE_LANGUAGE:CXX>:-UPy_LIMITED_API>)
 else()
-    # Create an empty target for setup.py when not targeting sm90a systems
+    # Create empty targets for setup.py when not targeting sm90a systems
     add_custom_target(_flashmla_C)
+    add_custom_target(_flashmla_extension_C)
 endif()
 

csrc/cache.h

@@ -56,3 +56,11 @@ void cp_gather_cache(
     torch::Tensor const& block_table,  // [BATCH, BLOCK_INDICES]
     torch::Tensor const& cu_seq_lens,  // [BATCH+1]
     int64_t batch_size, std::optional<torch::Tensor> seq_starts = std::nullopt);
+
+// Indexer K quantization and cache function
+void indexer_k_quant_and_cache(
+    torch::Tensor& k,             // [num_tokens, head_dim]
+    torch::Tensor& kv_cache,      // [num_blocks, block_size, cache_stride]
+    torch::Tensor& slot_mapping,  // [num_tokens]
+    int64_t quant_block_size,     // quantization block size
+    const std::string& scale_fmt);

csrc/cache_kernels.cu

@@ -16,6 +16,7 @@
 
 #include <algorithm>
 #include <cassert>
+#include <cfloat>  // FLT_MIN
 #include <map>
 #include <vector>
 
@@ -396,6 +397,176 @@ __global__ void concat_and_cache_mla_kernel(
   copy(k_pe, kv_cache, k_pe_stride, block_stride, pe_dim, kv_lora_rank);
 }
 
+template <typename scalar_t, typename cache_t, Fp8KVCacheDataType kv_dt>
+__global__ void concat_and_cache_ds_mla_kernel(
+    const scalar_t* __restrict__ kv_c,  // [num_tokens, kv_lora_rank]
+    const scalar_t* __restrict__ k_pe,  // [num_tokens, pe_dim]
+    cache_t* __restrict__ kv_cache,  // [num_blocks, block_size, (kv_lora_rank
+                                     // + pe_dim)]
+    const int64_t* __restrict__ slot_mapping,  // [num_tokens]
+    const int block_stride,                    //
+    const int entry_stride,                    //
+    const int kv_c_stride,                     //
+    const int k_pe_stride,                     //
+    const int kv_lora_rank,                    //
+    const int pe_dim,                          //
+    const int block_size,                      //
+    const float* scale                         //
+) {
+  const int64_t token_idx = blockIdx.x;
+  const int64_t slot_idx = slot_mapping[token_idx];
+  // NOTE: slot_idx can be -1 if the token is padded
+  if (slot_idx < 0) {
+    return;
+  }
+  const int64_t block_idx = slot_idx / block_size;
+  const int64_t block_offset = slot_idx % block_size;
+  const int64_t dst_idx_start =
+      block_idx * block_stride + block_offset * entry_stride;
+
+  // Create 4 tile scales in shared memory
+  __shared__ float smem[20];
+  float* shard_abs_max = smem;
+  float* tile_scales = smem + 16;
+
+  // For the NoPE part, each tile of 128 elements is handled by 4 warps
+  // (128 threads). There are 4 total tiles, so 16 warps (512 threads).
+  // The first thread of the first warp in each tile writes the scale
+  // value for the tile. The RoPE part (last 64 elements) is handled
+  // by another 2 warps (64 threads).
+  // So in total, we use 18 warps (576 threads) per block.
+
+  // Cast kv_cache to 16_bit for RoPE values
+  scalar_t* kv_cache_16bit =
+      reinterpret_cast<scalar_t*>(&kv_cache[dst_idx_start]);
+
+  // The last 64 threads handle the RoPE part
+  if (threadIdx.x >= kv_lora_rank) {
+    const int8_t pe_idx = threadIdx.x - kv_lora_rank;
+    const int64_t src_idx = token_idx * k_pe_stride + pe_idx;
+    // RoPE values start after the packed 8-bit NoPE values and the
+    // 32-bit scales
+    const int64_t dst_idx = kv_lora_rank / 2 + 8 + pe_idx;
+    kv_cache_16bit[dst_idx] = k_pe[src_idx];
+    return;
+  }
+
+  // Determine the scale for each chunk of NoPE
+  const int16_t tile_idx = threadIdx.x >> 7;
+  const int16_t warp_idx = (threadIdx.x & 127) >> 5;
+  const int16_t lane_idx = threadIdx.x & 31;
+
+  // Load the NoPE element for this thread into registers
+  const int64_t src_idx = token_idx * kv_c_stride + threadIdx.x;
+  const scalar_t src_val = kv_c[src_idx];
+
+  // Warp-level reduction to find the max absolute value in the warp
+  float max_abs = fabsf(src_val);
+#pragma unroll
+  for (int offset = 16; offset > 0; offset /= 2) {
+#ifdef USE_ROCM
+    max_abs = fmaxf(max_abs, __shfl_down_sync(UINT64_MAX, max_abs, offset));
+#else
+    max_abs = fmaxf(max_abs, __shfl_down_sync(0xFFFFFFFF, max_abs, offset));
+#endif
+  }
+
+  // The first lane of each warp in each tile writes the max_abs of this part
+  // of the tile to shared memory
+  if (lane_idx == 0) {
+    shard_abs_max[tile_idx * 4 + warp_idx] = max_abs;
+  }
+  __syncthreads();
+
+  // The first lane of the first warp in each tile computes the scale for the
+  // tile and writes it to shared memory and to kv_cache
+  if (warp_idx == 0 && lane_idx == 0) {
+    float4 shard_abs_max_vec =
+        reinterpret_cast<float4*>(shard_abs_max)[tile_idx];
+    float tile_scale = fmaxf(fmaxf(shard_abs_max_vec.x, shard_abs_max_vec.y),
+                             fmaxf(shard_abs_max_vec.z, shard_abs_max_vec.w)) /
+                       448.f;
+
+    // Avoid division by zero in `scaled_convert`
+    tile_scales[tile_idx] = fmaxf(tile_scale, FLT_MIN);
+    float* kv_cache_32bit = reinterpret_cast<float*>(&kv_cache[dst_idx_start]);
+    const uint64_t dst_idx = kv_lora_rank / 4 + tile_idx;
+    kv_cache_32bit[dst_idx] = tile_scales[tile_idx];
+  }
+
+  __syncthreads();
+
+  // Now all threads in the block scale and write their element
+  const float scale_val = tile_scales[tile_idx];
+  const int64_t dst_idx = dst_idx_start + threadIdx.x;
+  kv_cache[dst_idx] =
+      fp8::scaled_convert<uint8_t, scalar_t, Fp8KVCacheDataType::kFp8E4M3>(
+          src_val, scale_val);
+}
+
+template <typename scalar_t, typename cache_t, Fp8KVCacheDataType kv_dt>
+__global__ void indexer_k_quant_and_cache_kernel(
+    const scalar_t* __restrict__ k,  // [num_tokens, head_dim]
+    cache_t* __restrict__ kv_cache,  // [num_blocks, block_size, cache_stride]
+    const int64_t* __restrict__ slot_mapping,  // [num_tokens]
+    const int head_dim,                        // dimension of each head
+    const int quant_block_size,                // quantization block size
+    const int cache_block_size,                // cache block size
+    const int cache_stride,  // stride for each token in kv_cache
+    const bool use_ue8m0     // use ue8m0 scale format
+) {
+  constexpr int VEC_SIZE = 4;
+  const int64_t token_idx = blockIdx.x;
+  const int64_t head_dim_idx = (blockIdx.y * blockDim.y * blockDim.x +
+                                threadIdx.y * blockDim.x + threadIdx.x) *
+                               VEC_SIZE;
+  const int64_t slot_idx = slot_mapping[token_idx];
+  const int64_t block_idx = slot_idx / cache_block_size;
+  const int64_t block_offset = slot_idx % cache_block_size;
+
+  // NOTE: slot_idx can be -1 if the token is padded
+  if (slot_idx < 0 || (head_dim_idx >= head_dim)) {
+    return;
+  }
+
+  float2 k_val = (reinterpret_cast<const float2*>(
+      k))[(token_idx * head_dim + head_dim_idx) / VEC_SIZE];
+  scalar_t* k_val_ptr = reinterpret_cast<scalar_t*>(&k_val);
+  float amax = 0.0f;
+  for (int i = 0; i < VEC_SIZE; i++) {
+    amax = fmaxf(amax, fabsf(float(k_val_ptr[i])));
+  }
+  __syncwarp();
+
+  // Reduced amax
+  for (int mask = 16; mask > 0; mask /= 2) {
+#ifdef USE_ROCM
+    amax = fmaxf(amax, __shfl_xor_sync(uint64_t(-1), amax, mask));
+#else
+    amax = fmaxf(amax, __shfl_xor_sync(unsigned(-1), amax, mask));
+#endif
+  }
+  __syncwarp();
+  float scale = fmaxf(amax, 1e-4) / 448.0f;
+  if (use_ue8m0) {
+    scale = exp2f(ceilf(log2f(scale)));
+  }
+
+  const int64_t dst_offset = block_idx * cache_block_size * cache_stride +
+                             block_offset * head_dim + head_dim_idx;
+  for (int i = 0; i < VEC_SIZE; i++) {
+    kv_cache[dst_offset + i] =
+        fp8::scaled_convert<cache_t, scalar_t, kv_dt>(k_val_ptr[i], scale);
+  }
+  if (threadIdx.x == 0) {
+    const int64_t dst_scale_idx =
+        block_idx * cache_block_size * cache_stride +
+        cache_block_size * head_dim +
+        (block_offset * head_dim + head_dim_idx) * 4 / quant_block_size;
+    reinterpret_cast<float*>(kv_cache)[dst_scale_idx / 4] = scale;
+  }
+}
+
 }  // namespace vllm
 
 // KV_T is the data type of key and value tensors.
@@ -438,7 +609,7 @@ void reshape_and_cache(
   const cudaStream_t stream = at::cuda::getCurrentCUDAStream();
 
   DISPATCH_BY_KV_CACHE_DTYPE(key.dtype(), kv_cache_dtype,
-                             CALL_RESHAPE_AND_CACHE)
+                             CALL_RESHAPE_AND_CACHE);
 }
 
 // KV_T is the data type of key and value tensors.
@@ -509,6 +680,18 @@ void reshape_and_cache_flash(
           kv_c_stride, k_pe_stride, kv_lora_rank, pe_dim, block_size,   \
           reinterpret_cast<const float*>(scale.data_ptr()));
 
+// KV_T is the data type of key and value tensors.
+// CACHE_T is the stored data type of kv-cache.
+#define CALL_CONCAT_AND_CACHE_DS_MLA(KV_T, CACHE_T, KV_DTYPE)           \
+  vllm::concat_and_cache_ds_mla_kernel<KV_T, CACHE_T, KV_DTYPE>         \
+      <<<grid, block, 0, stream>>>(                                     \
+          reinterpret_cast<KV_T*>(kv_c.data_ptr()),                     \
+          reinterpret_cast<KV_T*>(k_pe.data_ptr()),                     \
+          reinterpret_cast<CACHE_T*>(kv_cache.data_ptr()),              \
+          slot_mapping.data_ptr<int64_t>(), block_stride, entry_stride, \
+          kv_c_stride, k_pe_stride, kv_lora_rank, pe_dim, block_size,   \
+          reinterpret_cast<const float*>(scale.data_ptr()));
+
 void concat_and_cache_mla(
     torch::Tensor& kv_c,          // [num_tokens, kv_lora_rank]
     torch::Tensor& k_pe,          // [num_tokens, pe_dim]
@@ -531,20 +714,44 @@ void concat_and_cache_mla(
   int pe_dim = k_pe.size(1);
   int block_size = kv_cache.size(1);
 
-  TORCH_CHECK(kv_cache.size(2) == kv_lora_rank + pe_dim);
+  if (kv_cache_dtype == "fp8_ds_mla") {
+    TORCH_CHECK(kv_lora_rank == 512, "kv_lora_rank must be 512 for fp8_ds_mla");
+    TORCH_CHECK(pe_dim == 64, "pe_dim must be 64 for fp8_ds_mla");
+    TORCH_CHECK(kv_cache.size(2) == 656 / kv_cache.itemsize(),
+                "kv_cache.size(2) must be 656 bytes for fp8_ds_mla");
+    TORCH_CHECK(kv_c.itemsize() == 2,
+                "kv_c.itemsize() must be 2 for fp8_ds_mla");
+    TORCH_CHECK(k_pe.itemsize() == 2,
+                "k_pe.itemsize() must be 2 for fp8_ds_mla");
+  } else {
+    TORCH_CHECK(kv_cache.size(2) == kv_lora_rank + pe_dim);
+  }
 
   int kv_c_stride = kv_c.stride(0);
   int k_pe_stride = k_pe.stride(0);
   int block_stride = kv_cache.stride(0);
   int entry_stride = kv_cache.stride(1);
 
-  dim3 grid(num_tokens);
-  dim3 block(std::min(kv_lora_rank, 512));
   const at::cuda::OptionalCUDAGuard device_guard(device_of(kv_c));
   const cudaStream_t stream = at::cuda::getCurrentCUDAStream();
 
-  DISPATCH_BY_KV_CACHE_DTYPE(kv_c.dtype(), kv_cache_dtype,
-                             CALL_CONCAT_AND_CACHE_MLA);
+  if (kv_cache_dtype == "fp8_ds_mla") {
+    dim3 grid(num_tokens);
+    // For the NoPE part, each tile of 128 elements is handled by 4 warps
+    // (128 threads). There are 4 total tiles, so 16 warps (512 threads).
+    // The first thread of the first warp in each tile writes the scale
+    // value for the tile. The RoPE part (last 64 elements) is handled
+    // by another 2 warps (64 threads).
+    // So in total, we use 18 warps (576 threads) per block.
+    dim3 block(576);
+    DISPATCH_BY_KV_CACHE_DTYPE(kv_c.dtype(), kv_cache_dtype,
+                               CALL_CONCAT_AND_CACHE_DS_MLA);
+  } else {
+    dim3 grid(num_tokens);
+    dim3 block(std::min(kv_lora_rank, 512));
+    DISPATCH_BY_KV_CACHE_DTYPE(kv_c.dtype(), kv_cache_dtype,
+                               CALL_CONCAT_AND_CACHE_MLA);
+  }
 }
 
 namespace vllm {
@@ -922,3 +1129,42 @@ void cp_gather_cache(
     TORCH_CHECK(false, "Unsupported data type width: ", dtype_bits);
   }
 }
+
+// Macro to dispatch the kernel based on the data type.
+#define CALL_INDEXER_K_QUANT_AND_CACHE(KV_T, CACHE_T, KV_DTYPE)         \
+  vllm::indexer_k_quant_and_cache_kernel<KV_T, CACHE_T, KV_DTYPE>       \
+      <<<grid, block, 0, stream>>>(                                     \
+          reinterpret_cast<KV_T*>(k.data_ptr()),                        \
+          reinterpret_cast<CACHE_T*>(kv_cache.data_ptr()),              \
+          slot_mapping.data_ptr<int64_t>(), head_dim, quant_block_size, \
+          cache_block_size, cache_stride, use_ue8m0);
+
+void indexer_k_quant_and_cache(
+    torch::Tensor& k,             // [num_tokens, head_dim]
+    torch::Tensor& kv_cache,      // [num_blocks, block_size, cache_stride]
+    torch::Tensor& slot_mapping,  // [num_tokens]
+    int64_t quant_block_size,     // quantization block size
+    const std::string& scale_fmt) {
+  int num_tokens = k.size(0);
+  int head_dim = k.size(1);
+  int cache_block_size = kv_cache.size(1);
+  int cache_stride = kv_cache.size(2);
+  bool use_ue8m0 = scale_fmt == "ue8m0";
+
+  TORCH_CHECK(k.device() == kv_cache.device(),
+              "k and kv_cache must be on the same device");
+  TORCH_CHECK(k.device() == slot_mapping.device(),
+              "k and slot_mapping must be on the same device");
+  TORCH_CHECK(head_dim % quant_block_size == 0,
+              "head_dim must be divisible by quant_block_size");
+
+  constexpr int vec_size = 4;
+  dim3 grid(num_tokens, (head_dim + quant_block_size * vec_size - 1) /
+                            (quant_block_size * vec_size));
+  dim3 block(32, vec_size);
+  const at::cuda::OptionalCUDAGuard device_guard(device_of(k));
+  const cudaStream_t stream = at::cuda::getCurrentCUDAStream();
+
+  DISPATCH_BY_KV_CACHE_DTYPE(k.dtype(), "fp8_e4m3",
+                             CALL_INDEXER_K_QUANT_AND_CACHE);
+}

csrc/core/batch_invariant.hpp

@@ -0,0 +1,16 @@
+#pragma once
+#include <cstdlib>
+#include <string>
+#include <cctype>
+
+namespace vllm {
+
+// vllm_kernel_override_batch_invariant(); returns true
+// if env VLLM_KERNEL_OVERRIDE_BATCH_INVARIANT=1
+inline bool vllm_kernel_override_batch_invariant() {
+  std::string env_key = "VLLM_KERNEL_OVERRIDE_BATCH_INVARIANT";
+  const char* val = std::getenv(env_key.c_str());
+  return (val && std::atoi(val) != 0) ? 1 : 0;
+}
+
+}  // namespace vllm

csrc/layernorm_kernels.cu

@@ -1,6 +1,7 @@
 #include "type_convert.cuh"
 #include "dispatch_utils.h"
 #include "cub_helpers.h"
+#include "core/batch_invariant.hpp"
 
 #include <torch/cuda.h>
 #include <c10/cuda/CUDAGuard.h>
@@ -413,7 +414,9 @@ void fused_add_rms_norm(torch::Tensor& input,     // [..., hidden_size]
                           wt_ptr % req_alignment_bytes == 0;
   bool offsets_are_multiple_of_vector_width =
       hidden_size % vector_width == 0 && input_stride % vector_width == 0;
-  if (ptrs_are_aligned && offsets_are_multiple_of_vector_width) {
+  bool batch_invariant_launch = vllm::vllm_kernel_override_batch_invariant();
+  if (ptrs_are_aligned && offsets_are_multiple_of_vector_width &&
+      !batch_invariant_launch) {
     LAUNCH_FUSED_ADD_RMS_NORM(8);
   } else {
     LAUNCH_FUSED_ADD_RMS_NORM(0);
@@ -459,7 +462,8 @@ void poly_norm(torch::Tensor& out,     // [..., hidden_size]
   auto inp_ptr = reinterpret_cast<std::uintptr_t>(input.data_ptr());
   auto out_ptr = reinterpret_cast<std::uintptr_t>(out.data_ptr());
   bool ptrs_are_aligned = inp_ptr % 16 == 0 && out_ptr % 16 == 0;
-  if (ptrs_are_aligned && hidden_size % 8 == 0) {
+  bool batch_invariant_launch = vllm::vllm_kernel_override_batch_invariant();
+  if (ptrs_are_aligned && hidden_size % 8 == 0 && !batch_invariant_launch) {
     LAUNCH_FUSED_POLY_NORM(8);
   } else {
     LAUNCH_FUSED_POLY_NORM(0);

csrc/layernorm_quant_kernels.cu

@@ -9,6 +9,7 @@
 #include "quantization/fp8/common.cuh"
 #include "dispatch_utils.h"
 #include "cub_helpers.h"
+#include "core/batch_invariant.hpp"
 
 #include <torch/cuda.h>
 #include <c10/cuda/CUDAGuard.h>
@@ -240,7 +241,9 @@ void fused_add_rms_norm_static_fp8_quant(
   auto wt_ptr = reinterpret_cast<std::uintptr_t>(weight.data_ptr());
   bool ptrs_are_aligned =
       inp_ptr % 16 == 0 && res_ptr % 16 == 0 && wt_ptr % 16 == 0;
-  if (ptrs_are_aligned && hidden_size % 8 == 0 && input_stride % 8 == 0) {
+  bool batch_invariant_launch = vllm::vllm_kernel_override_batch_invariant();
+  if (ptrs_are_aligned && hidden_size % 8 == 0 && input_stride % 8 == 0 &&
+      !batch_invariant_launch) {
     LAUNCH_FUSED_ADD_RMS_NORM(8);
   } else {
     LAUNCH_FUSED_ADD_RMS_NORM(0);

csrc/moe/topk_softmax_kernels.cu

@@ -21,6 +21,7 @@
 #include <c10/cuda/CUDAGuard.h>
 #include "../cuda_compat.h"
 #include "../cub_helpers.h"
+#include "../core/batch_invariant.hpp"
 
 #define MAX(a, b) ((a) > (b) ? (a) : (b))
 #define MIN(a, b) ((a) < (b) ? (a) : (b))
@@ -405,7 +406,8 @@ void topkGatingSoftmaxLauncherHelper(const float* input, const bool* finished, f
     using Constants = detail::TopkConstants<EXPERTS, BYTES_PER_LDG, WARP_SIZE_PARAM>;
     static constexpr int VPT = Constants::VPT;
     static constexpr int ROWS_PER_WARP = Constants::ROWS_PER_WARP;
-    const int num_warps = (num_rows + ROWS_PER_WARP - 1) / ROWS_PER_WARP;
+    const bool batch_invariant_launch = vllm::vllm_kernel_override_batch_invariant();
+    const int num_warps = batch_invariant_launch ? 32 : (num_rows + ROWS_PER_WARP - 1) / ROWS_PER_WARP;
     const int num_blocks = (num_warps + WARPS_PER_TB - 1) / WARPS_PER_TB;
 
     dim3 block_dim(WARP_SIZE_PARAM, WARPS_PER_TB);

csrc/quantization/fp8/nvidia/quant_utils.cuh

@@ -576,6 +576,17 @@ __inline__ __device__ Tout scaled_convert(const Tin& x, const float scale) {
           TORCH_CHECK(false,                                                   \
                       "Unsupported input type of kv cache: ", SRC_DTYPE);      \
         }                                                                      \
+      } else if (KV_DTYPE == "fp8_ds_mla") {                                   \
+        if (SRC_DTYPE == at::ScalarType::Float) {                              \
+          FN(float, uint8_t, vllm::Fp8KVCacheDataType::kFp8E4M3);              \
+        } else if (SRC_DTYPE == at::ScalarType::Half) {                        \
+          FN(uint16_t, uint8_t, vllm::Fp8KVCacheDataType::kFp8E4M3);           \
+        } else if (SRC_DTYPE == at::ScalarType::BFloat16) {                    \
+          FN(__nv_bfloat16, uint8_t, vllm::Fp8KVCacheDataType::kFp8E4M3);      \
+        } else {                                                               \
+          TORCH_CHECK(false,                                                   \
+                      "Unsupported input type of kv cache: ", SRC_DTYPE);      \
+        }                                                                      \
       } else {                                                                 \
         TORCH_CHECK(false, "Unsupported data type of kv cache: ", KV_DTYPE);   \
       }                                                                        \

csrc/torch_bindings.cpp

@@ -713,6 +713,13 @@ TORCH_LIBRARY_EXPAND(CONCAT(TORCH_EXTENSION_NAME, _cache_ops), cache_ops) {
       "cp_gather_cache(Tensor src_cache, Tensor! dst, Tensor block_table, "
       "Tensor cu_seq_lens, int batch_size, Tensor? seq_starts) -> ()");
   cache_ops.impl("cp_gather_cache", torch::kCUDA, &cp_gather_cache);
+
+  cache_ops.def(
+      "indexer_k_quant_and_cache(Tensor k, Tensor! kv_cache, Tensor "
+      "slot_mapping, "
+      "int quant_block_size, str kv_cache_dtype) -> ()");
+  cache_ops.impl("indexer_k_quant_and_cache", torch::kCUDA,
+                 &indexer_k_quant_and_cache);
 }
 
 TORCH_LIBRARY_EXPAND(CONCAT(TORCH_EXTENSION_NAME, _cuda_utils), cuda_utils) {

docker/Dockerfile

@@ -391,19 +391,32 @@ RUN --mount=type=cache,target=/root/.cache/uv bash - <<'BASH'
     git clone --depth 1 --recursive --shallow-submodules \
         --branch ${FLASHINFER_GIT_REF} \
         ${FLASHINFER_GIT_REPO} flashinfer
+    # Exclude CUDA arches for older versions (11.x and 12.0-12.7)
+    # TODO: Update this to allow setting TORCH_CUDA_ARCH_LIST as a build arg.
+    if [[ "${CUDA_VERSION}" == 11.* ]]; then
+        FI_TORCH_CUDA_ARCH_LIST="7.5 8.0 8.9"
+    elif [[ "${CUDA_VERSION}" == 12.[0-7]* ]]; then
+        FI_TORCH_CUDA_ARCH_LIST="7.5 8.0 8.9 9.0a"
+    else
+        # CUDA 12.8+ supports 10.0a and 12.0
+        FI_TORCH_CUDA_ARCH_LIST="7.5 8.0 8.9 9.0a 10.0a 12.0"
+    fi
     pushd flashinfer
-        if [ "${FLASHINFER_AOT_COMPILE}" = "true" ]; then
-            # Exclude CUDA arches for older versions (11.x and 12.0-12.7)
-            # TODO: Update this to allow setting TORCH_CUDA_ARCH_LIST as a build arg.
-            if [[ "${CUDA_VERSION}" == 11.* ]]; then
-                FI_TORCH_CUDA_ARCH_LIST="7.5 8.0 8.9"
-            elif [[ "${CUDA_VERSION}" == 12.[0-7]* ]]; then
-                FI_TORCH_CUDA_ARCH_LIST="7.5 8.0 8.9 9.0a"
-            else
-                # CUDA 12.8+ supports 10.0a and 12.0
-                FI_TORCH_CUDA_ARCH_LIST="7.5 8.0 8.9 9.0a 10.0a 12.0"
+        if [[ "${CUDA_VERSION}" == 12.8.* ]] && [ "$TARGETPLATFORM" = "linux/amd64" ]; then
+            # NOTE: To make new precompiled wheels, see tools/flashinfer-build.sh
+            echo "🏗️  Installing FlashInfer from pre-compiled wheel"
+            uv pip install --system https://wheels.vllm.ai/flashinfer-python/flashinfer_python-0.3.1-cp39-abi3-manylinux1_x86_64.whl \
+                --extra-index-url ${PYTORCH_CUDA_INDEX_BASE_URL}/cu$(echo $CUDA_VERSION | cut -d. -f1,2 | tr -d '.')
+            if [ "${FLASHINFER_AOT_COMPILE}" = "true" ]; then
+                # Download pre-compiled cubins
+                TORCH_CUDA_ARCH_LIST="${FI_TORCH_CUDA_ARCH_LIST}" \
+                    python3 -m flashinfer --download-cubin || echo "WARNING: Failed to download flashinfer cubins."
             fi
+        elif [ "${FLASHINFER_AOT_COMPILE}" = "true" ]; then
             echo "🏗️  Installing FlashInfer with AOT compilation for arches: ${FI_TORCH_CUDA_ARCH_LIST}"
+            export FLASHINFER_CUDA_ARCH_LIST="${FI_TORCH_CUDA_ARCH_LIST}"
+            # HACK: We need these to run flashinfer.aot before installing flashinfer, get from the package in the future
+            uv pip install --system cuda-python==$(echo $CUDA_VERSION | cut -d. -f1,2) pynvml==$(echo $CUDA_VERSION | cut -d. -f1) nvidia-nvshmem-cu$(echo $CUDA_VERSION | cut -d. -f1)
             # Build AOT kernels
             TORCH_CUDA_ARCH_LIST="${FI_TORCH_CUDA_ARCH_LIST}" \
                 python3 -m flashinfer.aot
@@ -443,7 +456,7 @@ RUN --mount=type=cache,target=/root/.cache/uv \
 ARG DEEPGEMM_GIT_REF
 COPY tools/install_deepgemm.sh /tmp/install_deepgemm.sh
 RUN --mount=type=cache,target=/root/.cache/uv \
-    VLLM_DOCKER_BUILD_CONTEXT=1 /tmp/install_deepgemm.sh --cuda-version "${CUDA_VERSION}" ${DEEPGEMM_GIT_REF:+--ref "$DEEPGEMM_GIT_REF"} 
+    VLLM_DOCKER_BUILD_CONTEXT=1 TORCH_CUDA_ARCH_LIST="9.0a 10.0a" /tmp/install_deepgemm.sh --cuda-version "${CUDA_VERSION}" ${DEEPGEMM_GIT_REF:+--ref "$DEEPGEMM_GIT_REF"}
 
 COPY tools/install_gdrcopy.sh install_gdrcopy.sh
 RUN set -eux; \
@@ -461,6 +474,12 @@ ENV CUDA_HOME=/usr/local/cuda
 RUN export TORCH_CUDA_ARCH_LIST="${TORCH_CUDA_ARCH_LIST:-9.0a+PTX}" \
     && bash install_python_libraries.sh
 
+# CUDA image changed from /usr/local/nvidia to /usr/local/cuda in 12.8 but will
+# return to /usr/local/nvidia in 13.0 to allow container providers to mount drivers
+# consistently from the host (see https://github.com/vllm-project/vllm/issues/18859).
+# Until then, add /usr/local/nvidia/lib64 before the image cuda path to allow override.
+ENV LD_LIBRARY_PATH=/usr/local/nvidia/lib64:${LD_LIBRARY_PATH}
+
 #################### vLLM installation IMAGE ####################
 
 #################### TEST IMAGE ####################
@@ -533,7 +552,7 @@ RUN --mount=type=cache,target=/root/.cache/uv \
     else \
         BITSANDBYTES_VERSION="0.46.1"; \
     fi; \
-    uv pip install --system accelerate hf_transfer modelscope "bitsandbytes>=${BITSANDBYTES_VERSION}" 'timm>=1.0.17' boto3 runai-model-streamer runai-model-streamer[s3]
+    uv pip install --system accelerate hf_transfer modelscope "bitsandbytes>=${BITSANDBYTES_VERSION}" 'timm>=1.0.17' 'runai-model-streamer[s3]>=0.14.0'
 
 ENV VLLM_USAGE_SOURCE production-docker-image
 

docs/community/meetups.md

@@ -2,6 +2,7 @@
 
 We host regular meetups in San Francisco Bay Area every 2 months. We will share the project updates from the vLLM team and have guest speakers from the industry to share their experience and insights. Please find the materials of our previous meetups below:
 
+- [vLLM Toronto Meetup](https://luma.com/e80e0ymm), September 25th 2025. [[Slides]](https://docs.google.com/presentation/d/1IYJYmJcu9fLpID5N5RbW_vO0XLo0CGOR14IXOjB61V8/edit?usp=sharing)
 - [vLLM Shenzhen Meetup](https://mp.weixin.qq.com/s/k8ZBO1u2_2odgiKWH_GVTQ), August 30th 2025. [[Slides]](https://drive.google.com/drive/folders/1Ua2SVKVSu-wp5vou_6ElraDt2bnKhiEA)
 - [vLLM Singapore Meetup](https://www.sginnovate.com/event/vllm-sg-meet), August 27th 2025. [[Slides]](https://drive.google.com/drive/folders/1ncf3GyqLdqFaB6IeB834E5TZJPLAOiXZ?usp=sharing)
 - [vLLM Shanghai Meetup](https://mp.weixin.qq.com/s/pDmAXHcN7Iqc8sUKgJgGtg), August 23rd 2025. [[Slides]](https://drive.google.com/drive/folders/1OvLx39wnCGy_WKq8SiVKf7YcxxYI3WCH)

docs/contributing/benchmarks.md

@@ -823,6 +823,30 @@ The latest performance results are hosted on the public [vLLM Performance Dashbo
 
 More information on the performance benchmarks and their parameters can be found in [Benchmark README](https://github.com/intel-ai-tce/vllm/blob/more_cpu_models/.buildkite/nightly-benchmarks/README.md) and [performance benchmark description](gh-file:.buildkite/nightly-benchmarks/performance-benchmarks-descriptions.md).
 
+### Continuous Benchmarking
+
+The continuous benchmarking provides automated performance monitoring for vLLM across different models and GPU devices. This helps track vLLM's performance characteristics over time and identify any performance regressions or improvements.
+
+#### How It Works
+
+The continuous benchmarking is triggered via a [GitHub workflow CI](https://github.com/pytorch/pytorch-integration-testing/actions/workflows/vllm-benchmark.yml) in the PyTorch infrastructure repository, which runs automatically every 4 hours. The workflow executes three types of performance tests:
+
+- **Serving tests**: Measure request handling and API performance
+- **Throughput tests**: Evaluate token generation rates
+- **Latency tests**: Assess response time characteristics
+
+#### Benchmark Configuration
+
+The benchmarking currently runs on a predefined set of models configured in the [vllm-benchmarks directory](https://github.com/pytorch/pytorch-integration-testing/tree/main/vllm-benchmarks/benchmarks). To add new models for benchmarking:
+
+1. Navigate to the appropriate GPU directory in the benchmarks configuration
+2. Add your model specifications to the corresponding configuration files
+3. The new models will be included in the next scheduled benchmark run
+
+#### Viewing Results
+
+All continuous benchmarking results are automatically published to the public [vLLM Performance Dashboard](https://hud.pytorch.org/benchmark/llms?repoName=vllm-project%2Fvllm).
+
 [](){ #nightly-benchmarks }
 
 ## Nightly Benchmarks

docs/contributing/model/multimodal.md

@@ -66,35 +66,12 @@ Further update the model as follows:
 !!! important
     The returned `multimodal_embeddings` must be either a **3D [torch.Tensor][]** of shape `(num_items, feature_size, hidden_size)`, or a **list / tuple of 2D [torch.Tensor][]'s** of shape `(feature_size, hidden_size)`, so that `multimodal_embeddings[i]` retrieves the embeddings generated from the `i`-th multimodal data item (e.g, image) of the request.
 
-- Implement [get_input_embeddings][vllm.model_executor.models.interfaces.SupportsMultiModal.get_input_embeddings] to merge `multimodal_embeddings` with text embeddings from the `input_ids`. If input processing for the model is implemented correctly (see sections below), then you can leverage the utility function we provide to easily merge the embeddings.
+!!! note
+    By default, vLLM merges the multimodal embeddings into text embeddings depending on the information of their locations defined in
+    [PlaceholderRange][vllm.multimodal.inputs.PlaceholderRange] from input processing.
+    This logic can be found at [get_input_embeddings][vllm.model_executor.models.interfaces.SupportsMultiModal.get_input_embeddings].
 
-    ??? code
-
-        ```python
-        from .utils import merge_multimodal_embeddings
-
-        class YourModelForImage2Seq(nn.Module):
-            ...
-
-            def get_input_embeddings(
-                self,
-                input_ids: torch.Tensor,
-                multimodal_embeddings: Optional[MultiModalEmbeddings] = None,
-            ) -> torch.Tensor:
-
-                # `get_input_embeddings` should already be implemented for the language 
-                # model as one of the requirements of basic vLLM model implementation.
-                inputs_embeds = self.language_model.get_input_embeddings(input_ids)
-
-                if multimodal_embeddings is not None:
-                    inputs_embeds = merge_multimodal_embeddings(
-                        input_ids=input_ids, 
-                        inputs_embeds=inputs_embeds, 
-                        multimodal_embeddings=multimodal_embeddings,
-                        placeholder_token_id=self.config.image_token_index)
-
-                return inputs_embeds
-        ```
+    You may override this method if additional logic is required for your model when merging embeddings. 
 
 - Implement [get_language_model][vllm.model_executor.models.interfaces.SupportsMultiModal.get_language_model] getter to provide stable access to the underlying language model.
 

docs/contributing/profiling.md

@@ -160,6 +160,22 @@ GUI example:
 
 <img width="1799" alt="Screenshot 2025-03-05 at 11 48 42 AM" src="https://github.com/user-attachments/assets/c7cff1ae-6d6f-477d-a342-bd13c4fc424c" />
 
+## Continuous Profiling
+
+There is a [GitHub CI workflow](https://github.com/pytorch/pytorch-integration-testing/actions/workflows/vllm-profiling.yml) in the PyTorch infrastructure repository that provides continuous profiling for different models on vLLM. This automated profiling helps track performance characteristics over time and across different model configurations.
+
+### How It Works
+
+The workflow currently runs weekly profiling sessions for selected models, generating detailed performance traces that can be analyzed using different tools to identify performance regressions or optimization opportunities. But, it can be triggered manually as well, using the Github Action tool.
+
+### Adding New Models
+
+To extend the continuous profiling to additional models, you can modify the [profiling-tests.json](https://github.com/pytorch/pytorch-integration-testing/blob/main/vllm-profiling/cuda/profiling-tests.json) configuration file in the PyTorch integration testing repository. Simply add your model specifications to this file to include them in the automated profiling runs.
+
+### Viewing Profiling Results
+
+The profiling traces generated by the continuous profiling workflow are publicly available on the [vLLM Performance Dashboard](https://hud.pytorch.org/benchmark/llms?repoName=vllm-project%2Fvllm). Look for the **Profiling traces** table to access and download the traces for different models and runs.
+
 ## Profiling vLLM Python Code
 
 The Python standard library includes
@@ -208,3 +224,11 @@ One example is [snakeviz](https://jiffyclub.github.io/snakeviz/).
 pip install snakeviz
 snakeviz expensive_function.prof
 ```
+
+### Analyzing Garbage Collection Costs
+
+Leverage VLLM_GC_DEBUG environment variable to debug GC costs.
+
+- VLLM_GC_DEBUG=1: enable GC debugger with gc.collect elpased times
+- VLLM_GC_DEBUG='{"top_objects":5}': enable GC debugger to log top 5
+  collected objects for each gc.collect

docs/features/README.md

@@ -52,7 +52,7 @@ th:not(:first-child) {
 | [mm](multimodal_inputs.md) | ✅ | ✅ | [🟠](gh-pr:4194)<sup>^</sup> | ❔ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ❔ | ✅ | | | |
 | best-of | ✅ | ✅ | ✅ | [❌](gh-issue:6137) | ✅ | ❌ | ✅ | ✅ | ✅ | ❔ | [❌](gh-issue:7968) | ✅ | ✅ | | |
 | beam-search | ✅ | ✅ | ✅ | [❌](gh-issue:6137) | ✅ | ❌ | ✅ | ✅ | ✅ | ❔ | [❌](gh-issue:7968) | ❔ | ✅ | ✅ | |
-| [prompt-embeds](prompt_embeds.md) | ✅ | [❌](gh-issue:25096) | ? | ❌ | ✅ | ❌ | ❌ | ✅ | ❌ | ? | ? | ❌ | ? | ? | ✅ |
+| [prompt-embeds](prompt_embeds.md) | ✅ | [❌](gh-issue:25096) | ✅ | ❌ | ✅ | ❌ | ❌ | ✅ | ❌ | ❔ | ❔ | ❌ | ❔ | ❔ | ✅ |
 
 \* Chunked prefill and prefix caching are only applicable to last-token pooling.  
 <sup>^</sup> LoRA is only applicable to the language backbone of multimodal models.

docs/features/multimodal_inputs.md

@@ -6,6 +6,10 @@ This page teaches you how to pass multi-modal inputs to [multi-modal models][sup
     We are actively iterating on multi-modal support. See [this RFC](gh-issue:4194) for upcoming changes,
     and [open an issue on GitHub](https://github.com/vllm-project/vllm/issues/new/choose) if you have any feedback or feature requests.
 
+!!! tip
+    When serving multi-modal models, consider setting `--allowed-media-domains` to restrict domain that vLLM can access to prevent it from accessing arbitrary endpoints that can potentially be vulnerable to Server-Side Request Forgery (SSRF) attacks. You can provide a list of domains for this arg. For example: `--allowed-media-domains upload.wikimedia.org github.com www.bogotobogo.com`
+    This restriction is especially important if you run vLLM in a containerized environment where the vLLM pods may have unrestricted access to internal networks.
+
 ## Offline Inference
 
 To input multi-modal data, follow this schema in [vllm.inputs.PromptType][]:

docs/features/nixl_connector_usage.md

@@ -84,7 +84,7 @@ python tests/v1/kv_connector/nixl_integration/toy_proxy_server.py \
     - Connection info is passed via KVTransferParams from prefiller to decoder for handshake
 
 - `VLLM_NIXL_ABORT_REQUEST_TIMEOUT`: Timeout (in seconds) for automatically releasing the prefiller’s KV cache for a particular request. (Optional)
-    - Default: 120
+    - Default: 480
     - If a request is aborted and the decoder has not yet read the KV-cache blocks through the nixl channel, the prefill instance will release its KV-cache blocks after this timeout to avoid holding them indefinitely.
 
 ## Multi-Instance Setup

docs/features/tool_calling.md

@@ -323,8 +323,10 @@ Flags: `--tool-call-parser longcat`
 
 Supported models:
 
-* `ZhipuAI/GLM-4.5`
-* `ZhipuAI/GLM-4.5-Air`
+* `zai-org/GLM-4.5`
+* `zai-org/GLM-4.5-Air`
+* `zai-org/GLM-4.6`
+* `zai-org/GLM-4.6-Air`
 
 Flags: `--tool-call-parser glm45`
 

docs/getting_started/installation/README.md

@@ -25,3 +25,4 @@ The backends below live **outside** the main `vllm` repository and follow the
 | MetaX MACA GPU | N/A, install from source | <https://github.com/MetaX-MACA/vLLM-metax> |
 | Rebellions ATOM / REBEL NPU | `vllm-rbln` | <https://github.com/rebellions-sw/vllm-rbln> |
 | IBM Spyre AIU | `vllm-spyre` | <https://github.com/vllm-project/vllm-spyre> |
+| Cambricon MLU | `vllm-mlu` | <https://github.com/Cambricon/vllm-mlu> |

docs/getting_started/installation/cpu/s390x.inc.md

@@ -46,22 +46,22 @@ Execute the following commands to build and install vLLM from source.
     Please build the following dependencies, `torchvision`, `pyarrow` from source before building vLLM.
 
 ```bash
-    sed -i '/^torch/d' requirements-build.txt    # remove torch from requirements-build.txt since we use nightly builds
+    sed -i '/^torch/d' requirements/build.txt    # remove torch from requirements/build.txt since we use nightly builds
     uv pip install -v \
         --torch-backend auto \
-        -r requirements-build.txt \
-        -r requirements-cpu.txt \
+        -r requirements/build.txt \
+        -r requirements/cpu.txt \
     VLLM_TARGET_DEVICE=cpu python setup.py bdist_wheel && \
         uv pip install dist/*.whl
 ```
 
 ??? console "pip"
     ```bash
-        sed -i '/^torch/d' requirements-build.txt    # remove torch from requirements-build.txt since we use nightly builds
+        sed -i '/^torch/d' requirements/build.txt    # remove torch from requirements/build.txt since we use nightly builds
         pip install -v \
             --extra-index-url https://download.pytorch.org/whl/nightly/cpu \
-            -r requirements-build.txt \
-            -r requirements-cpu.txt \
+            -r requirements/build.txt \
+            -r requirements/cpu.txt \
         VLLM_TARGET_DEVICE=cpu python setup.py bdist_wheel && \
             pip install dist/*.whl
     ```

docs/models/supported_models.md

@@ -367,7 +367,7 @@ th {
 | `Gemma3nForCausalLM` | Gemma 3n | `google/gemma-3n-E2B-it`, `google/gemma-3n-E4B-it`, etc. | | | ✅︎ |
 | `GlmForCausalLM` | GLM-4 | `zai-org/glm-4-9b-chat-hf`, etc. | ✅︎ | ✅︎ | ✅︎ |
 | `Glm4ForCausalLM` | GLM-4-0414 | `zai-org/GLM-4-32B-0414`, etc. | ✅︎ | ✅︎ | ✅︎ |
-| `Glm4MoeForCausalLM` | GLM-4.5 | `zai-org/GLM-4.5`, etc. | ✅︎ | ✅︎ | ✅︎ |
+| `Glm4MoeForCausalLM` | GLM-4.5, GLM-4.6 | `zai-org/GLM-4.5`, etc. | ✅︎ | ✅︎ | ✅︎ |
 | `GPT2LMHeadModel` | GPT-2 | `gpt2`, `gpt2-xl`, etc. | | ✅︎ | ✅︎ |
 | `GPTBigCodeForCausalLM` | StarCoder, SantaCoder, WizardCoder | `bigcode/starcoder`, `bigcode/gpt_bigcode-santacoder`, `WizardLM/WizardCoder-15B-V1.0`, etc. | ✅︎ | ✅︎ | ✅︎ |
 | `GPTJForCausalLM` | GPT-J | `EleutherAI/gpt-j-6b`, `nomic-ai/gpt4all-j`, etc. | | ✅︎ | ✅︎ |
@@ -396,7 +396,6 @@ th {
 | `MiniCPM3ForCausalLM` | MiniCPM3 | `openbmb/MiniCPM3-4B`, etc. | ✅︎ | ✅︎ | ✅︎ |
 | `MistralForCausalLM` | Mistral, Mistral-Instruct | `mistralai/Mistral-7B-v0.1`, `mistralai/Mistral-7B-Instruct-v0.1`, etc. | ✅︎ | ✅︎ | ✅︎ |
 | `MixtralForCausalLM` | Mixtral-8x7B, Mixtral-8x7B-Instruct | `mistralai/Mixtral-8x7B-v0.1`, `mistralai/Mixtral-8x7B-Instruct-v0.1`, `mistral-community/Mixtral-8x22B-v0.1`, etc. | ✅︎ | ✅︎ | ✅︎ |
-| `MotifForCausalLM` | Motif-1-Tiny | `Motif-Technologies/Motif-2.6B`, `Motif-Technologies/Motif-2.6b-v1.1-LC`, etc. | ✅︎ | ✅︎ | |
 | `MPTForCausalLM` | MPT, MPT-Instruct, MPT-Chat, MPT-StoryWriter | `mosaicml/mpt-7b`, `mosaicml/mpt-7b-storywriter`, `mosaicml/mpt-30b`, etc. | | ✅︎ | ✅︎ |
 | `NemotronForCausalLM` | Nemotron-3, Nemotron-4, Minitron | `nvidia/Minitron-8B-Base`, `mgoin/Nemotron-4-340B-Base-hf-FP8`, etc. | ✅︎ | ✅︎ | ✅︎ |
 | `NemotronHForCausalLM` | Nemotron-H | `nvidia/Nemotron-H-8B-Base-8K`, `nvidia/Nemotron-H-47B-Base-8K`, `nvidia/Nemotron-H-56B-Base-8K`, etc. | ✅︎ | ✅︎ | ✅︎ |
@@ -404,12 +403,11 @@ th {
 | `OLMo2ForCausalLM` | OLMo2 | `allenai/OLMo-2-0425-1B`, etc. | ✅︎ | ✅︎ | ✅︎ |
 | `OLMo3ForCausalLM` | OLMo3 | TBA | ✅︎ | ✅︎ | ✅︎ |
 | `OLMoEForCausalLM` | OLMoE | `allenai/OLMoE-1B-7B-0924`, `allenai/OLMoE-1B-7B-0924-Instruct`, etc. | | ✅︎ | ✅︎ |
-| `OPTForCausalLM` | OPT, OPT-IML | `facebook/opt-66b`, `facebook/opt-iml-max-30b`, etc. | | ✅︎ | ✅︎ |
+| `OPTForCausalLM` | OPT, OPT-IML | `facebook/opt-66b`, `facebook/opt-iml-max-30b`, etc. | ✅︎ | ✅︎ | ✅︎ |
 | `OrionForCausalLM` | Orion | `OrionStarAI/Orion-14B-Base`, `OrionStarAI/Orion-14B-Chat`, etc. | | ✅︎ | ✅︎ |
 | `PhiForCausalLM` | Phi | `microsoft/phi-1_5`, `microsoft/phi-2`, etc. | ✅︎ | ✅︎ | ✅︎ |
 | `Phi3ForCausalLM` | Phi-4, Phi-3 | `microsoft/Phi-4-mini-instruct`, `microsoft/Phi-4`, `microsoft/Phi-3-mini-4k-instruct`, `microsoft/Phi-3-mini-128k-instruct`, `microsoft/Phi-3-medium-128k-instruct`, etc. | ✅︎ | ✅︎ | ✅︎ |
 | `PhiMoEForCausalLM` | Phi-3.5-MoE | `microsoft/Phi-3.5-MoE-instruct`, etc. | ✅︎ | ✅︎ | ✅︎ |
-| `Phi4FlashForCausalLM` | Phi-4-mini-flash-reasoning | `microsoft/microsoft/Phi-4-mini-instruct`, etc. | | | |
 | `PersimmonForCausalLM` | Persimmon | `adept/persimmon-8b-base`, `adept/persimmon-8b-chat`, etc. | | ✅︎ | ✅︎ |
 | `Plamo2ForCausalLM` | PLaMo2 | `pfnet/plamo-2-1b`, `pfnet/plamo-2-8b`, etc. | | ✅︎ | ✅︎ |
 | `QWenLMHeadModel` | Qwen | `Qwen/Qwen-7B`, `Qwen/Qwen-7B-Chat`, etc. | ✅︎ | ✅︎ | ✅︎ |

docs/serving/openai_compatible_server.md

@@ -351,13 +351,92 @@ you can use the [official OpenAI Python client](https://github.com/openai/openai
     To use the Transcriptions API, please install with extra audio dependencies using `pip install vllm[audio]`.
 
 Code example: <gh-file:examples/online_serving/openai_transcription_client.py>
-<!-- TODO: api enforced limits + uploading audios -->
 
 #### API Enforced Limits
 
 Set the maximum audio file size (in MB) that VLLM will accept, via the
 `VLLM_MAX_AUDIO_CLIP_FILESIZE_MB` environment variable. Default is 25 MB.
 
+#### Uploading Audio Files
+
+The Transcriptions API supports uploading audio files in various formats including FLAC, MP3, MP4, MPEG, MPGA, M4A, OGG, WAV, and WEBM.
+
+**Using OpenAI Python Client:**
+
+??? code
+
+    ```python
+    from openai import OpenAI
+
+    client = OpenAI(
+        base_url="http://localhost:8000/v1",
+        api_key="token-abc123",
+    )
+
+    # Upload audio file from disk
+    with open("audio.mp3", "rb") as audio_file:
+        transcription = client.audio.transcriptions.create(
+            model="openai/whisper-large-v3-turbo",
+            file=audio_file,
+            language="en",
+            response_format="verbose_json"
+        )
+
+    print(transcription.text)
+    ```
+
+**Using curl with multipart/form-data:**
+
+??? code
+
+    ```bash
+    curl -X POST "http://localhost:8000/v1/audio/transcriptions" \
+      -H "Authorization: Bearer token-abc123" \
+      -F "file=@audio.mp3" \
+      -F "model=openai/whisper-large-v3-turbo" \
+      -F "language=en" \
+      -F "response_format=verbose_json"
+    ```
+
+**Supported Parameters:**
+
+- `file`: The audio file to transcribe (required)
+- `model`: The model to use for transcription (required)
+- `language`: The language code (e.g., "en", "zh") (optional)
+- `prompt`: Optional text to guide the transcription style (optional)
+- `response_format`: Format of the response ("json", "text") (optional)
+- `temperature`: Sampling temperature between 0 and 1 (optional)
+
+For the complete list of supported parameters including sampling parameters and vLLM extensions, see the [protocol definitions](https://github.com/vllm-project/vllm/blob/main/vllm/entrypoints/openai/protocol.py#L2182).
+
+**Response Format:**
+
+For `verbose_json` response format:
+
+??? code
+
+    ```json
+    {
+      "text": "Hello, this is a transcription of the audio file.",
+      "language": "en",
+      "duration": 5.42,
+      "segments": [
+        {
+          "id": 0,
+          "seek": 0,
+          "start": 0.0,
+          "end": 2.5,
+          "text": "Hello, this is a transcription",
+          "tokens": [50364, 938, 428, 307, 275, 28347],
+          "temperature": 0.0,
+          "avg_logprob": -0.245,
+          "compression_ratio": 1.235,
+          "no_speech_prob": 0.012
+        }
+      ]
+    }
+    ```
+
 #### Extra Parameters
 
 The following [sampling parameters][sampling-params] are supported.

docs/training/trl.md

@@ -1,12 +1,54 @@
 # Transformers Reinforcement Learning
 
-Transformers Reinforcement Learning (TRL) is a full stack library that provides a set of tools to train transformer language models with methods like Supervised Fine-Tuning (SFT), Group Relative Policy Optimization (GRPO), Direct Preference Optimization (DPO), Reward Modeling, and more. The library is integrated with 🤗 transformers.
+[Transformers Reinforcement Learning](https://huggingface.co/docs/trl) (TRL) is a full stack library that provides a set of tools to train transformer language models with methods like Supervised Fine-Tuning (SFT), Group Relative Policy Optimization (GRPO), Direct Preference Optimization (DPO), Reward Modeling, and more. The library is integrated with 🤗 transformers.
 
 Online methods such as GRPO or Online DPO require the model to generate completions. vLLM can be used to generate these completions!
 
-See the guide [vLLM for fast generation in online methods](https://huggingface.co/docs/trl/main/en/speeding_up_training#vllm-for-fast-generation-in-online-methods) in the TRL documentation for more information.
+See the [vLLM integration guide](https://huggingface.co/docs/trl/main/en/vllm_integration) in the TRL documentation for more information.
+
+TRL currently supports the following online trainers with vLLM:
+
+- [GRPO](https://huggingface.co/docs/trl/main/en/grpo_trainer)
+- [Online DPO](https://huggingface.co/docs/trl/main/en/online_dpo_trainer)
+- [RLOO](https://huggingface.co/docs/trl/main/en/rloo_trainer)
+- [Nash-MD](https://huggingface.co/docs/trl/main/en/nash_md_trainer)
+- [XPO](https://huggingface.co/docs/trl/main/en/xpo_trainer)
+
+To enable vLLM in TRL, set the `use_vllm` flag in the trainer configuration to `True`.
+
+## Modes of Using vLLM During Training
+
+TRL supports **two modes** for integrating vLLM during training: **server mode** and **colocate mode**. You can control how vLLM operates during training with the `vllm_mode` parameter.
+
+### Server mode
+
+In **server mode**, vLLM runs as an independent process on dedicated GPUs and communicates with the trainer through HTTP requests. This configuration is ideal when you have separate GPUs for inference, as it isolates generation workloads from training, ensuring stable performance and easier scaling.
+
+```python
+from trl import GRPOConfig
+
+training_args = GRPOConfig(
+    ...,
+    use_vllm=True,
+    vllm_mode="server",  # default value, can be omitted
+)
+```
+
+### Colocate mode
+
+In **colocate mode**, vLLM runs inside the trainer process and shares GPU memory with the training model. This avoids launching a separate server and can improve GPU utilization, but may lead to memory contention on the training GPUs.
+
+```python
+from trl import GRPOConfig
+
+training_args = GRPOConfig(
+    ...,
+    use_vllm=True,
+    vllm_mode="colocate",
+)
+```
+
+Some trainers also support **vLLM sleep mode**, which offloads parameters and caches to GPU RAM during training, helping reduce memory usage. Learn more in the [memory optimization docs](https://huggingface.co/docs/trl/main/en/reducing_memory_usage#vllm-sleep-mode).
 
 !!! info
-    For more information on the `use_vllm` flag you can provide to the configs of these online methods, see:
-    - [`trl.GRPOConfig.use_vllm`](https://huggingface.co/docs/trl/main/en/grpo_trainer#trl.GRPOConfig.use_vllm)
-    - [`trl.OnlineDPOConfig.use_vllm`](https://huggingface.co/docs/trl/main/en/online_dpo_trainer#trl.OnlineDPOConfig.use_vllm)
+    For detailed configuration options and flags, refer to the documentation of the specific trainer you are using.

docs/usage/security.md

@@ -60,6 +60,12 @@ Key points from the PyTorch security guide:
 - Implement proper authentication and authorization for management interfaces
 - Follow the principle of least privilege for all system components
 
+### 4. **Restrict Domains Access for Media URLs:**
+
+Restrict domains that vLLM can access for media URLs by setting
+`--allowed-media-domains` to prevent Server-Side Request Forgery (SSRF) attacks.
+(e.g. `--allowed-media-domains upload.wikimedia.org github.com www.bogotobogo.com`)
+
 ## Security and Firewalls: Protecting Exposed vLLM Systems
 
 While vLLM is designed to allow unsafe network services to be isolated to

examples/offline_inference/spec_decode.py

@@ -54,6 +54,7 @@ def parse_args():
         "--method",
         type=str,
         default="eagle",
+        choices=["ngram", "eagle", "eagle3", "mtp"],
     )
     parser.add_argument("--num-spec-tokens", type=int, default=2)
     parser.add_argument("--prompt-lookup-max", type=int, default=5)
@@ -118,9 +119,9 @@ def main(args):
             "prompt_lookup_max": args.prompt_lookup_max,
             "prompt_lookup_min": args.prompt_lookup_min,
         }
-    elif args.method.endswith("mtp"):
+    elif args.method == "mtp":
         speculative_config = {
-            "method": args.method,
+            "method": "mtp",
             "num_speculative_tokens": args.num_spec_tokens,
         }
     else:

examples/offline_inference/torchrun_dp_example.py

@@ -4,6 +4,11 @@
 experimental support for data-parallel inference with torchrun
 Note the data load balancing and distribution is done out of the vllm engine,
 no internal lb supported in external_launcher mode.
+
+To run this example:
+```bash
+$ torchrun --nproc-per-node=2 examples/offline_inference/torchrun_dp_example.py
+```
 """
 
 from vllm import LLM, SamplingParams
@@ -14,7 +19,7 @@ prompts = [
     "The president of the United States is",
     "The capital of France is",
     "The future of AI is",
-] * 50
+]
 
 # Create sampling parameters, the same across all ranks
 sampling_params = SamplingParams(temperature=0.8, top_p=0.95)
@@ -45,14 +50,13 @@ prompts = [
 
 outputs = llm.generate(prompts, sampling_params)
 
-
-# all ranks will have the same outputs
-print("-" * 50)
 for output in outputs:
     prompt = output.prompt
     generated_text = output.outputs[0].text
-    print(f"Prompt: {prompt!r}\nGenerated text: {generated_text!r}\n")
-    print("-" * 50)
+    print(
+        f"DP Rank: {dp_rank} Prompt: {prompt!r}\nGenerated text: {generated_text!r}\n"
+    )
+
 """
 Further tips:
 

examples/online_serving/openai_chat_completion_client_for_multimodal.py

@@ -38,11 +38,13 @@ client = OpenAI(
     base_url=openai_api_base,
 )
 
+headers = {"User-Agent": "vLLM Example Client"}
+
 
 def encode_base64_content_from_url(content_url: str) -> str:
     """Encode a content retrieved from a remote url to base64 format."""
 
-    with requests.get(content_url) as response:
+    with requests.get(content_url, headers=headers) as response:
         response.raise_for_status()
         result = base64.b64encode(response.content).decode("utf-8")
 
@@ -50,19 +52,19 @@ def encode_base64_content_from_url(content_url: str) -> str:
 
 
 # Text-only inference
-def run_text_only(model: str) -> None:
+def run_text_only(model: str, max_completion_tokens: int) -> None:
     chat_completion = client.chat.completions.create(
         messages=[{"role": "user", "content": "What's the capital of France?"}],
         model=model,
-        max_completion_tokens=64,
+        max_completion_tokens=max_completion_tokens,
     )
 
     result = chat_completion.choices[0].message.content
-    print("Chat completion output:", result)
+    print("Chat completion output:\n", result)
 
 
 # Single-image input inference
-def run_single_image(model: str) -> None:
+def run_single_image(model: str, max_completion_tokens: int) -> None:
     ## Use image url in the payload
     image_url = "https://upload.wikimedia.org/wikipedia/commons/thumb/d/dd/Gfp-wisconsin-madison-the-nature-boardwalk.jpg/2560px-Gfp-wisconsin-madison-the-nature-boardwalk.jpg"
     chat_completion_from_url = client.chat.completions.create(
@@ -79,11 +81,11 @@ def run_single_image(model: str) -> None:
             }
         ],
         model=model,
-        max_completion_tokens=64,
+        max_completion_tokens=max_completion_tokens,
     )
 
     result = chat_completion_from_url.choices[0].message.content
-    print("Chat completion output from image url:", result)
+    print("Chat completion output from image url:\n", result)
 
     ## Use base64 encoded image in the payload
     image_base64 = encode_base64_content_from_url(image_url)
@@ -101,7 +103,7 @@ def run_single_image(model: str) -> None:
             }
         ],
         model=model,
-        max_completion_tokens=64,
+        max_completion_tokens=max_completion_tokens,
     )
 
     result = chat_completion_from_base64.choices[0].message.content
@@ -109,7 +111,7 @@ def run_single_image(model: str) -> None:
 
 
 # Multi-image input inference
-def run_multi_image(model: str) -> None:
+def run_multi_image(model: str, max_completion_tokens: int) -> None:
     image_url_duck = "https://upload.wikimedia.org/wikipedia/commons/d/da/2015_Kaczka_krzy%C5%BCowka_w_wodzie_%28samiec%29.jpg"
     image_url_lion = "https://upload.wikimedia.org/wikipedia/commons/7/77/002_The_lion_king_Snyggve_in_the_Serengeti_National_Park_Photo_by_Giles_Laurent.jpg"
     chat_completion_from_url = client.chat.completions.create(
@@ -130,15 +132,15 @@ def run_multi_image(model: str) -> None:
             }
         ],
         model=model,
-        max_completion_tokens=64,
+        max_completion_tokens=max_completion_tokens,
     )
 
     result = chat_completion_from_url.choices[0].message.content
-    print("Chat completion output:", result)
+    print("Chat completion output:\n", result)
 
 
 # Video input inference
-def run_video(model: str) -> None:
+def run_video(model: str, max_completion_tokens: int) -> None:
     video_url = "http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/ForBiggerFun.mp4"
     video_base64 = encode_base64_content_from_url(video_url)
 
@@ -157,11 +159,11 @@ def run_video(model: str) -> None:
             }
         ],
         model=model,
-        max_completion_tokens=64,
+        max_completion_tokens=max_completion_tokens,
     )
 
     result = chat_completion_from_url.choices[0].message.content
-    print("Chat completion output from image url:", result)
+    print("Chat completion output from video url:\n", result)
 
     ## Use base64 encoded video in the payload
     chat_completion_from_base64 = client.chat.completions.create(
@@ -178,15 +180,15 @@ def run_video(model: str) -> None:
             }
         ],
         model=model,
-        max_completion_tokens=64,
+        max_completion_tokens=max_completion_tokens,
     )
 
     result = chat_completion_from_base64.choices[0].message.content
-    print("Chat completion output from base64 encoded image:", result)
+    print("Chat completion output from base64 encoded video:\n", result)
 
 
 # Audio input inference
-def run_audio(model: str) -> None:
+def run_audio(model: str, max_completion_tokens: int) -> None:
     from vllm.assets.audio import AudioAsset
 
     audio_url = AudioAsset("winning_call").url
@@ -211,11 +213,11 @@ def run_audio(model: str) -> None:
             }
         ],
         model=model,
-        max_completion_tokens=64,
+        max_completion_tokens=max_completion_tokens,
     )
 
     result = chat_completion_from_base64.choices[0].message.content
-    print("Chat completion output from input audio:", result)
+    print("Chat completion output from input audio:\n", result)
 
     # HTTP URL
     chat_completion_from_url = client.chat.completions.create(
@@ -235,11 +237,11 @@ def run_audio(model: str) -> None:
             }
         ],
         model=model,
-        max_completion_tokens=64,
+        max_completion_tokens=max_completion_tokens,
     )
 
     result = chat_completion_from_url.choices[0].message.content
-    print("Chat completion output from audio url:", result)
+    print("Chat completion output from audio url:\n", result)
 
     # base64 URL
     chat_completion_from_base64 = client.chat.completions.create(
@@ -259,14 +261,14 @@ def run_audio(model: str) -> None:
             }
         ],
         model=model,
-        max_completion_tokens=64,
+        max_completion_tokens=max_completion_tokens,
     )
 
     result = chat_completion_from_base64.choices[0].message.content
-    print("Chat completion output from base64 encoded audio:", result)
+    print("Chat completion output from base64 encoded audio:\n", result)
 
 
-def run_multi_audio(model: str) -> None:
+def run_multi_audio(model: str, max_completion_tokens: int) -> None:
     from vllm.assets.audio import AudioAsset
 
     # Two different audios to showcase batched inference.
@@ -300,11 +302,11 @@ def run_multi_audio(model: str) -> None:
             }
         ],
         model=model,
-        max_completion_tokens=64,
+        max_completion_tokens=max_completion_tokens,
     )
 
     result = chat_completion_from_base64.choices[0].message.content
-    print("Chat completion output from input audio:", result)
+    print("Chat completion output from input audio:\n", result)
 
 
 example_function_map = {
@@ -330,13 +332,20 @@ def parse_args():
         choices=list(example_function_map.keys()),
         help="Conversation type with multimodal data.",
     )
+    parser.add_argument(
+        "--max-completion-tokens",
+        "-n",
+        type=int,
+        default=128,
+        help="Maximum number of tokens to generate for each completion.",
+    )
     return parser.parse_args()
 
 
 def main(args) -> None:
     chat_type = args.chat_type
     model = get_first_model(client)
-    example_function_map[chat_type](model)
+    example_function_map[chat_type](model, args.max_completion_tokens)
 
 
 if __name__ == "__main__":

mkdocs.yaml

@@ -102,7 +102,6 @@ plugins:
           - https://numpy.org/doc/stable/objects.inv
           - https://pytorch.org/docs/stable/objects.inv
           - https://psutil.readthedocs.io/en/stable/objects.inv
-          - https://huggingface.co/docs/transformers/main/en/objects.inv
 
 markdown_extensions:
   - attr_list

requirements/nightly_torch_test.txt

@@ -43,7 +43,6 @@ tritonclient==2.51.0
 numba == 0.60.0; python_version == '3.9' # v0.61 doesn't support Python 3.9. Required for N-gram speculative decoding
 numba == 0.61.2; python_version > '3.9'
 numpy
-runai-model-streamer==0.11.0
-runai-model-streamer-s3==0.11.0
+runai-model-streamer[s3]==0.14.0
 fastsafetensors>=0.1.10
 pydantic>=2.10 # 2.9 leads to error on python 3.10

requirements/rocm.txt

@@ -5,8 +5,6 @@ numba == 0.60.0; python_version == '3.9' # v0.61 doesn't support Python 3.9. Req
 numba == 0.61.2; python_version > '3.9'
 
 # Dependencies for AMD GPUs
-boto3
-botocore
 datasets
 ray[cgraph]>=2.48.0 # Ray Compiled Graph, required for pipeline parallelism in V1.
 peft
@@ -15,7 +13,6 @@ tensorizer==2.10.1
 packaging>=24.2
 setuptools>=77.0.3,<80.0.0
 setuptools-scm>=8
-runai-model-streamer==0.11.0
-runai-model-streamer-s3==0.11.0
+runai-model-streamer[s3]==0.14.0
 conch-triton-kernels==1.2.1
 timm>=1.0.17

requirements/test.in

@@ -51,8 +51,7 @@ tritonclient==2.51.0
 numba == 0.60.0; python_version == '3.9' # v0.61 doesn't support Python 3.9. Required for N-gram speculative decoding
 numba == 0.61.2; python_version > '3.9'
 numpy
-runai-model-streamer==0.11.0
-runai-model-streamer-s3==0.11.0
+runai-model-streamer[s3]==0.14.0
 fastsafetensors>=0.1.10
 pydantic>=2.10 # 2.9 leads to error on python 3.10
 decord==0.6.0

requirements/test.txt

@@ -72,7 +72,9 @@ blobfile==3.0.0
 bm25s==0.2.13
     # via mteb
 boto3==1.35.57
-    # via tensorizer
+    # via
+    #   runai-model-streamer-s3
+    #   tensorizer
 botocore==1.35.57
     # via
     #   boto3
@@ -925,10 +927,10 @@ rsa==4.9.1
     # via google-auth
 rtree==1.4.0
     # via torchgeo
-runai-model-streamer==0.11.0
-    # via -r requirements/test.in
-runai-model-streamer-s3==0.11.0
+runai-model-streamer==0.14.0
     # via -r requirements/test.in
+runai-model-streamer-s3==0.14.0
+    # via runai-model-streamer
 s3transfer==0.10.3
     # via boto3
 sacrebleu==2.4.3

setup.py

@@ -322,6 +322,8 @@ class precompiled_wheel_utils:
                     "vllm/_C.abi3.so",
                     "vllm/_moe_C.abi3.so",
                     "vllm/_flashmla_C.abi3.so",
+                    "vllm/_flashmla_extension_C.abi3.so",
+                    "vllm/_sparse_flashmla_C.abi3.so",
                     "vllm/vllm_flash_attn/_vllm_fa2_C.abi3.so",
                     "vllm/vllm_flash_attn/_vllm_fa3_C.abi3.so",
                     "vllm/cumem_allocator.abi3.so",
@@ -589,6 +591,8 @@ if _is_cuda():
         # not targeting a hopper system
         ext_modules.append(
             CMakeExtension(name="vllm._flashmla_C", optional=True))
+        ext_modules.append(
+            CMakeExtension(name="vllm._flashmla_extension_C", optional=True))
     ext_modules.append(CMakeExtension(name="vllm.cumem_allocator"))
 
 if _build_custom_ops():
@@ -654,10 +658,7 @@ setup(
         "bench": ["pandas", "datasets"],
         "tensorizer": ["tensorizer==2.10.1"],
         "fastsafetensors": ["fastsafetensors >= 0.1.10"],
-        "runai": [
-            "runai-model-streamer >= 0.14.0", "runai-model-streamer-gcs",
-            "google-cloud-storage", "runai-model-streamer-s3", "boto3"
-        ],
+        "runai": ["runai-model-streamer[s3,gcs] >= 0.14.0"],
         "audio": ["librosa", "soundfile",
                   "mistral_common[audio]"],  # Required for audio processing
         "video": [],  # Kept for backwards compatibility

tests/compile/piecewise/test_full_cudagraph.py

@@ -3,12 +3,11 @@
 import contextlib
 import os
 import weakref
-from dataclasses import dataclass
-from typing import Optional
 
 import pytest
 
 from tests.utils import wait_for_gpu_memory_to_clear
+from tests.v1.attention.utils import full_cg_backend_configs as backend_configs
 from vllm import LLM, SamplingParams
 from vllm.config import CompilationConfig
 from vllm.platforms import current_platform
@@ -33,89 +32,6 @@ def temporary_environ(env_vars):
                 os.environ[k] = v
 
 
-@dataclass
-class BackendConfig:
-    name: str
-    env_vars: dict
-    comp_config: dict
-    specific_gpu_arch: Optional[tuple] = None
-
-
-# Define all backend configurations of full cudagraph to be tested
-backend_configs = {
-    # FA3 on Hopper
-    "FA3":
-    BackendConfig(name="FA3",
-                  env_vars={
-                      "VLLM_FLASH_ATTN_VERSION": "3",
-                      "VLLM_FLASH_ATTN_MAX_NUM_SPLITS_FOR_CUDA_GRAPH": "16",
-                  },
-                  comp_config={
-                      "cudagraph_mode": "FULL",
-                  },
-                  specific_gpu_arch=(9, 0)),
-    # FlashMLA on Hopper
-    "FlashMLA":
-    BackendConfig(name="FlashMLA",
-                  env_vars={
-                      "VLLM_ATTENTION_BACKEND": "FLASHMLA",
-                  },
-                  comp_config={
-                      "cudagraph_mode": "FULL_AND_PIECEWISE",
-                  },
-                  specific_gpu_arch=(9, 0)),
-    # FlashAttention MLA on Hopper
-    "FlashAttentionMLA":
-    BackendConfig(name="FlashAttentionMLA",
-                  env_vars={
-                      "VLLM_ATTENTION_BACKEND": "FLASH_ATTN_MLA",
-                      "VLLM_FLASH_ATTN_MAX_NUM_SPLITS_FOR_CUDA_GRAPH": "16",
-                  },
-                  comp_config={
-                      "cudagraph_mode": "FULL_DECODE_ONLY",
-                  },
-                  specific_gpu_arch=(9, 0)),
-    # Cutlass MLA on Blackwell
-    "CutlassMLA":
-    BackendConfig(
-        name="CutlassMLA",
-        env_vars={
-            "VLLM_USE_V1": "1",
-            "VLLM_ATTENTION_BACKEND": "CUTLASS_MLA",
-            "FORCE_NUM_KV_SPLITS":
-            "1",  # TODO: remove this when hang issue is fixed
-        },
-        comp_config={
-            "cudagraph_mode": "FULL_AND_PIECEWISE",
-            "cudagraph_capture_sizes": [16, 32, 64, 128, 256, 512],
-        },
-        specific_gpu_arch=(10, 0)),
-    # FA2
-    "FA2":
-    BackendConfig(name="FA2",
-                  env_vars={
-                      "VLLM_FLASH_ATTN_VERSION": "2",
-                      "VLLM_FLASH_ATTN_MAX_NUM_SPLITS_FOR_CUDA_GRAPH": "16",
-                  },
-                  comp_config={
-                      "cudagraph_mode": "FULL",
-                  }),
-    # Triton Attention
-    "TritonAttn":
-    BackendConfig(name="TritonAttn",
-                  env_vars={"VLLM_ATTENTION_BACKEND": "TRITON_ATTN"},
-                  comp_config={
-                      "cudagraph_mode": "FULL",
-                  }),
-    # FlashInfer
-    "FlashInfer":
-    BackendConfig(name="FlashInfer",
-                  env_vars={"VLLM_ATTENTION_BACKEND": "FLASHINFER"},
-                  comp_config={
-                      "cudagraph_mode": "FULL_AND_PIECEWISE",
-                  }),
-}
-
 test_params_full_cudagraph = []
 
 # deepseek-ai/DeepSeek-V2-Lite with MLA

tests/compile/test_config.py

@@ -4,7 +4,7 @@ import pytest
 
 import vllm
 from vllm.compilation.counter import compilation_counter
-from vllm.config import CompilationConfig, VllmConfig
+from vllm.config import CompilationConfig, CUDAGraphMode, VllmConfig
 from vllm.utils import _is_torch_equal_or_newer
 
 
@@ -106,7 +106,6 @@ def test_dynamo_as_is(vllm_runner, monkeypatch):
 def test_no_compilation(vllm_runner, monkeypatch):
     # Disable multiprocessing so that the counter is in the same process
     monkeypatch.setenv('VLLM_ENABLE_V1_MULTIPROCESSING', '0')
-
     with (
             compilation_counter.expect(num_graphs_seen=0,
                                        dynamo_as_is_count=0),
@@ -131,3 +130,67 @@ def test_enforce_eager(vllm_runner, monkeypatch):
                         enforce_eager=True,
                         gpu_memory_utilization=0.4) as _):
         pass
+
+
+def test_splitting_ops_dynamic():
+    # Default config
+    config = VllmConfig()
+    assert config.compilation_config.cudagraph_mode == \
+        CUDAGraphMode.FULL_AND_PIECEWISE
+    assert config.compilation_config.splitting_ops_contain_attention()
+
+    # When use_inductor_graph_partition=True
+    if _is_torch_equal_or_newer('2.9.0.dev'):
+        # inductor graph partition is only available in PyTorch 2.9+.
+        # this is a fast config check so we are not using pytest.skip.
+        config = VllmConfig(compilation_config=CompilationConfig(
+            use_inductor_graph_partition=True,
+            splitting_ops=["silly_attention"]))
+        # should ignore splitting_ops
+        assert config.compilation_config.splitting_ops == []
+
+    # When attn_fusion pass enabled.
+    config = VllmConfig(compilation_config=CompilationConfig(
+        pass_config={
+            "enable_attn_fusion": True,
+            "enable_noop": True
+        },
+        custom_ops=["+quant_fp8"],
+        cudagraph_mode=CUDAGraphMode.PIECEWISE,
+    ))
+    assert config.compilation_config.splitting_ops == []
+    # cudagraph mode also fall back to FULL
+    assert config.compilation_config.cudagraph_mode == \
+        CUDAGraphMode.FULL
+
+    # splitting_ops can not contain attention ops when attn_fusion
+    # pass enabled.
+    with pytest.raises(AssertionError):
+        config = VllmConfig(compilation_config=CompilationConfig(
+            pass_config={
+                "enable_attn_fusion": True,
+                "enable_noop": True
+            },
+            custom_ops=["+quant_fp8"],
+            cudagraph_mode=CUDAGraphMode.PIECEWISE,
+            # work around for accessing all attntion ops
+            splitting_ops=CompilationConfig()._attention_ops,
+        ))
+
+    # When both use_inductor_graph_partition and attn_fusion pass enabled.
+    if _is_torch_equal_or_newer('2.9.0.dev'):
+        config = VllmConfig(compilation_config=CompilationConfig(
+            use_inductor_graph_partition=True,
+            pass_config={
+                "enable_attn_fusion": True,
+                "enable_noop": True
+            },
+            custom_ops=["+quant_fp8"],
+            cudagraph_mode=CUDAGraphMode.PIECEWISE,
+        ))
+        assert config.compilation_config.splitting_ops == []
+        # enable_attn_fusion is directly support under
+        # use_inductor_graph_partition=True, and cudagraph_mode
+        # is unchanged.
+        assert config.compilation_config.cudagraph_mode == \
+            CUDAGraphMode.PIECEWISE

tests/compile/test_full_graph.py

@@ -139,6 +139,21 @@ def test_custom_compile_config(
     run_model(compilation_config, model, model_kwargs)
 
 
+@pytest.mark.parametrize(
+    "optimization_level",
+    [CompilationLevel.NO_COMPILATION, CompilationLevel.PIECEWISE],
+)
+def test_fp8_kv_scale_compile(optimization_level: int):
+    model = "Qwen/Qwen2-0.5B"
+    model_kwargs = {
+        "quantization": "fp8",
+        "kv_cache_dtype": "fp8_e4m3",
+        "calculate_kv_scales": True,
+        "max_model_len": 512,
+    }
+    run_model(optimization_level, model, model_kwargs)
+
+
 def test_inductor_graph_partition_attn_fusion(caplog_vllm):
     if not is_torch_equal_or_newer("2.9.0.dev"):
         pytest.skip("inductor graph partition is only available "

tests/compile/test_fusion_attn.py

@@ -191,7 +191,6 @@ class AttentionQuantPatternModel(torch.nn.Module):
                 num_kv_heads=self.num_kv_heads,
                 head_size=self.head_size,
                 dtype=self.kv_cache_dtype,
-                use_mla=False,
             ),
             layer_names=[self.attn.layer_name],
             vllm_config=self.vllm_config,

tests/entrypoints/conftest.py

@@ -208,3 +208,11 @@ def zephyr_lora_files():
     """Download zephyr LoRA files once per test session."""
     from huggingface_hub import snapshot_download
     return snapshot_download(repo_id="typeof/zephyr-7b-beta-lora")
+
+
+@pytest.fixture(scope="session")
+def opt125_lora_files() -> str:
+    """Download opt-125m LoRA files once per test session."""
+    from huggingface_hub import snapshot_download
+    return snapshot_download(
+        repo_id="peft-internal-testing/opt-125m-dummy-lora")

tests/entrypoints/openai/test_completion_with_prompt_embeds.py

@@ -3,6 +3,7 @@
 
 import base64
 import io
+import json
 
 import openai  # use the official client for correctness check
 import pytest
@@ -16,13 +17,15 @@ from ...utils import RemoteOpenAIServer
 
 # any model with a chat template should work here
 MODEL_NAME = "facebook/opt-125m"
+LORA_SERVING_MODEL_NAME = "opt125m-lora"
 
 CONFIG = AutoConfig.from_pretrained(MODEL_NAME)
 
 
-@pytest.fixture(scope="module")
-def default_server_args() -> list[str]:
-    return [
+@pytest.fixture(scope="module", params=["use-lora"])
+def default_server_args(request: pytest.FixtureRequest,
+                        opt125_lora_files: str) -> list[str]:
+    args = [
         # use half precision for speed and memory savings in CI environment
         "--dtype",
         "bfloat16",
@@ -35,6 +38,25 @@ def default_server_args() -> list[str]:
         "--enable-prompt-embeds",
     ]
 
+    if request.param == "use-lora":
+        lora_module_1 = {
+            "name": LORA_SERVING_MODEL_NAME,
+            "path": opt125_lora_files,
+            "base_model_name": MODEL_NAME
+        }
+
+        args.extend([
+            "--enable-lora",
+            "--lora-module",
+            json.dumps(lora_module_1),
+            "--max-lora-rank",
+            "64",
+            "--max-cpu-loras",
+            "2",
+        ])
+
+    return args
+
 
 EXAMPLE_PROMPTS = [
     "Hello, my name is",
@@ -74,7 +96,7 @@ async def client_with_prompt_embeds(server_with_prompt_embeds):
 
 
 @pytest.mark.asyncio
-@pytest.mark.parametrize("model_name", [MODEL_NAME])
+@pytest.mark.parametrize("model_name", [MODEL_NAME, LORA_SERVING_MODEL_NAME])
 async def test_completions_with_prompt_embeds(
     example_prompt_embeds,
     client_with_prompt_embeds: openai.AsyncOpenAI,
@@ -179,7 +201,7 @@ async def test_completions_with_prompt_embeds(
 
 
 @pytest.mark.asyncio
-@pytest.mark.parametrize("model_name", [MODEL_NAME])
+@pytest.mark.parametrize("model_name", [MODEL_NAME, LORA_SERVING_MODEL_NAME])
 async def test_completions_errors_with_prompt_embeds(
         client_with_prompt_embeds: openai.AsyncOpenAI, model_name: str):
     # Test error case: invalid prompt_embeds
@@ -194,7 +216,7 @@ async def test_completions_errors_with_prompt_embeds(
 
 @pytest.mark.asyncio
 @pytest.mark.parametrize("logprobs_arg", [1, 0])
-@pytest.mark.parametrize("model_name", [MODEL_NAME])
+@pytest.mark.parametrize("model_name", [MODEL_NAME, LORA_SERVING_MODEL_NAME])
 async def test_completions_with_logprobs_and_prompt_embeds(
     example_prompt_embeds,
     client_with_prompt_embeds: openai.AsyncOpenAI,

tests/entrypoints/openai/test_lora_resolvers.py

@@ -45,6 +45,7 @@ class MockModelConfig:
     logits_processor_pattern: Optional[str] = None
     diff_sampling_param: Optional[dict] = None
     allowed_local_media_path: str = ""
+    allowed_media_domains: Optional[list[str]] = None
     encoder_config = None
     generation_config: str = "auto"
     skip_tokenizer_init: bool = False

tests/entrypoints/openai/test_serving_chat.py

@@ -240,6 +240,7 @@ class MockModelConfig:
     logits_processor_pattern = None
     diff_sampling_param: Optional[dict] = None
     allowed_local_media_path: str = ""
+    allowed_media_domains: Optional[list[str]] = None
     encoder_config = None
     generation_config: str = "auto"
     media_io_kwargs: dict[str, dict[str, Any]] = field(default_factory=dict)

tests/entrypoints/test_chat_utils.py

@@ -19,6 +19,7 @@ from vllm.entrypoints.chat_utils import (_try_extract_ast, load_chat_template,
                                          parse_chat_messages,
                                          parse_chat_messages_futures,
                                          resolve_chat_template_content_format,
+                                         resolve_chat_template_kwargs,
                                          resolve_hf_chat_template)
 from vllm.multimodal import MultiModalDataDict, MultiModalUUIDDict
 from vllm.multimodal.utils import (encode_audio_base64, encode_image_base64,
@@ -37,6 +38,7 @@ QWEN2AUDIO_MODEL_ID = "Qwen/Qwen2-Audio-7B-Instruct"
 QWEN2VL_MODEL_ID = "Qwen/Qwen2-VL-2B-Instruct"
 QWEN25VL_MODEL_ID = "Qwen/Qwen2.5-VL-3B-Instruct"
 QWEN25OMNI_MODEL_ID = "Qwen/Qwen2.5-Omni-7B"
+QWEN3_MODEL_ID = "Qwen/Qwen3-8B"
 LLAMA_GUARD_MODEL_ID = "meta-llama/Llama-Guard-3-1B"
 HERMES_MODEL_ID = "NousResearch/Hermes-3-Llama-3.1-8B"
 MISTRAL_MODEL_ID = "mistralai/Mistral-Small-3.1-24B-Instruct-2503"
@@ -2255,6 +2257,89 @@ def test_resolve_hf_chat_template(sample_json_schema, model, use_tools):
     assert isinstance(chat_template, str)
 
 
+@pytest.mark.parametrize(
+    "model, expected_kwargs",
+    [
+        (
+            QWEN2VL_MODEL_ID,
+            {
+                "add_vision_id", "add_generation_prompt",
+                "continue_final_message", "tools"
+            },
+        ),
+        (
+            QWEN3_MODEL_ID,
+            {
+                "enable_thinking", "add_generation_prompt",
+                "continue_final_message", "tools"
+            },
+        ),
+    ],
+)
+def test_resolve_hf_chat_template_kwargs(sample_json_schema, model,
+                                         expected_kwargs):
+    """checks that chat_template is a dict type for HF models."""
+    model_info = HF_EXAMPLE_MODELS.find_hf_info(model)
+    model_info.check_available_online(on_fail="skip")
+
+    tools = ([{
+        "type": "function",
+        "function": {
+            "name": "dummy_function_name",
+            "description": "This is a dummy function",
+            "parameters": sample_json_schema,
+        },
+    }])
+
+    chat_template_kwargs = {
+        # both unused
+        "unsed_kwargs_1": 123,
+        "unsed_kwargs_2": "abc",
+        # should not appear
+        "chat_template": "{% Hello world! %}",
+        # used by tokenizer
+        "continue_final_message": True,
+        "tools": tools,
+        # both used by Qwen2-VL and Qwen3
+        "add_generation_prompt": True,
+        # only used by Qwen2-VL
+        "add_vision_id": True,
+        # only used by Qwen3
+        "enable_thinking": True,
+    }
+
+    model_config = ModelConfig(
+        model,
+        tokenizer=model_info.tokenizer or model,
+        tokenizer_mode=model_info.tokenizer_mode,
+        revision=model_info.revision,
+        trust_remote_code=model_info.trust_remote_code,
+        hf_overrides=model_info.hf_overrides,
+        skip_tokenizer_init=model_info.skip_tokenizer_init,
+        enforce_eager=model_info.enforce_eager,
+        dtype=model_info.dtype)
+
+    # Build the tokenizer
+    tokenizer = get_tokenizer(
+        model,
+        trust_remote_code=model_config.trust_remote_code,
+    )
+
+    # Test detecting the tokenizer's chat_template
+    chat_template = resolve_hf_chat_template(
+        tokenizer,
+        chat_template=None,
+        tools=tools,
+        model_config=model_config,
+    )
+    resolved_chat_template_kwargs = resolve_chat_template_kwargs(
+        tokenizer,
+        chat_template=chat_template,
+        chat_template_kwargs=chat_template_kwargs,
+    )
+    assert set(resolved_chat_template_kwargs.keys()) == expected_kwargs
+
+
 # NOTE: Qwen2-Audio default chat template is specially defined inside
 # processor class instead of using `tokenizer_config.json`
 # yapf: disable

tests/kernels/attention/test_cache.py

@@ -593,6 +593,119 @@ def test_concat_and_cache_mla(
         torch.testing.assert_close(kv_cache, ref_kv_cache)
 
 
+@pytest.mark.parametrize("kv_lora_rank", KV_LORA_RANKS)
+@pytest.mark.parametrize("qk_rope_head_dim", QK_ROPE_HEAD_DIMS)
+@pytest.mark.parametrize("num_tokens", NUM_TOKENS_MLA)
+@pytest.mark.parametrize("block_size", BLOCK_SIZES_MLA)
+@pytest.mark.parametrize("num_blocks", NUM_BLOCKS_MLA)
+@pytest.mark.parametrize("dtype", DTYPES)
+@pytest.mark.parametrize("seed", SEEDS)
+@pytest.mark.parametrize("device", CUDA_DEVICES)
+@torch.inference_mode()
+def test_concat_and_cache_ds_mla(
+    kv_lora_rank: int,
+    qk_rope_head_dim: int,
+    num_tokens: int,
+    block_size: int,
+    num_blocks: int,
+    dtype: torch.dtype,
+    seed: int,
+    device: str,
+) -> None:
+    if dtype.itemsize != 2:
+        pytest.skip("ds_mla only supports 16-bit input")
+    kv_cache_dtype = "fp8_ds_mla"
+    current_platform.seed_everything(seed)
+    torch.set_default_device(device)
+
+    total_slots = num_blocks * block_size
+    slot_mapping_lst = random.sample(range(total_slots), num_tokens)
+    slot_mapping = torch.tensor(slot_mapping_lst,
+                                dtype=torch.long,
+                                device=device)
+
+    kv_c = torch.randn(num_tokens, kv_lora_rank, dtype=dtype, device=device)
+    k_pe = torch.randn(num_tokens,
+                       qk_rope_head_dim,
+                       dtype=dtype,
+                       device=device)
+    entry_size = kv_lora_rank + (4 * 4) + (2 * qk_rope_head_dim)
+
+    scale = torch.tensor(1.0, dtype=torch.float32, device=device)
+    kv_cache = _create_mla_cache(num_blocks,
+                                 block_size,
+                                 entry_size,
+                                 dtype=torch.uint8,
+                                 kv_cache_dtype=kv_cache_dtype,
+                                 device=device)
+
+    ref_cache = torch.zeros_like(kv_cache, dtype=kv_cache.dtype)
+    tile_data = torch.zeros(128, dtype=dtype, device=device)
+
+    for i in range(num_tokens):
+        slot = slot_mapping[i].item()
+        block_idx = slot // block_size
+        block_offset = slot % block_size
+
+        ref_cache_slice = ref_cache[block_idx, block_offset]
+        ref_cache_16bit = ref_cache_slice.view(dtype)
+        ref_cache_32bit = ref_cache_slice.view(torch.float32)
+
+        kv_c_data = kv_c[i]
+        for tile_idx in range(4):
+            tile_start = tile_idx * 128
+            tile_end = (tile_idx + 1) * 128
+            tile_data[:] = kv_c_data[tile_start:tile_end]
+
+            # tile_scale = tile_data.amax().to(torch.float32) / 448.
+            # NOTE: Using torch's amax() gives different results,
+            # so this must be manually computed.
+            tile_data_float = tile_data.to(torch.float32)
+            manual_max = abs(tile_data_float[0])
+            for j in range(1, 128):
+                manual_max = max(manual_max, abs(tile_data_float[j]))
+            tile_scale = manual_max / 448.
+
+            ref_cache_32bit[kv_lora_rank // 4 + tile_idx] = tile_scale
+
+            ops.convert_fp8(ref_cache_slice[tile_start:tile_end],
+                            tile_data,
+                            tile_scale.item(),
+                            kv_dtype="fp8")
+
+        for j in range(qk_rope_head_dim):
+            ref_cache_16bit[kv_lora_rank // 2 + 8 + j] = k_pe[i, j]
+
+    opcheck(
+        torch.ops._C_cache_ops.concat_and_cache_mla,
+        (kv_c, k_pe, kv_cache, slot_mapping, kv_cache_dtype, scale),
+        test_utils=DEFAULT_OPCHECK_TEST_UTILS,
+    )
+
+    ops.concat_and_cache_mla(kv_c, k_pe, kv_cache, slot_mapping,
+                             kv_cache_dtype, scale)
+
+    for i in range(num_tokens):
+        slot = slot_mapping[i].item()
+        block_idx = slot // block_size
+        block_offset = slot % block_size
+        kv_cache_slice = kv_cache[block_idx, block_offset]
+        ref_cache_slice = ref_cache[block_idx, block_offset]
+
+        kv_nope = kv_cache_slice[:kv_lora_rank]
+        ref_nope = ref_cache_slice[:kv_lora_rank]
+        kv_scales = kv_cache_slice.view(torch.float32)[kv_lora_rank //
+                                                       4:kv_lora_rank // 4 + 4]
+        ref_scales = ref_cache_slice.view(
+            torch.float32)[kv_lora_rank // 4:kv_lora_rank // 4 + 4]
+        kv_rope = kv_cache_slice.view(dtype)[kv_lora_rank // 2 + 8:]
+        ref_rope = ref_cache_slice.view(dtype)[kv_lora_rank // 2 + 8:]
+
+        torch.testing.assert_close(kv_nope, ref_nope, atol=0.001, rtol=0.1)
+        torch.testing.assert_close(kv_scales, ref_scales, atol=0.001, rtol=0.1)
+        torch.testing.assert_close(kv_rope, ref_rope, atol=0.001, rtol=0.1)
+
+
 @pytest.mark.parametrize("kv_lora_rank", KV_LORA_RANKS)
 @pytest.mark.parametrize("qk_rope_head_dim", QK_ROPE_HEAD_DIMS)
 @pytest.mark.parametrize("block_size", BLOCK_SIZES_MLA)

tests/kernels/attention/test_deepgemm_attention.py

@@ -0,0 +1,279 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+import random
+
+import pytest
+import torch
+
+from vllm.platforms import current_platform
+from vllm.utils import cdiv, has_deep_gemm
+from vllm.utils.deep_gemm import (_ceil_to_ue8m0, calc_diff, fp8_mqa_logits,
+                                  fp8_paged_mqa_logits, get_num_sms,
+                                  get_paged_mqa_logits_metadata)
+
+
+def kv_cache_cast_to_fp8(x: torch.Tensor) -> torch.Tensor:
+    # x: (num_blocks, block_size, 1, head_dim)
+    num_blocks, block_size, num_heads, head_dim = x.shape
+    assert num_heads == 1
+    x_amax = x.abs().float().amax(dim=3, keepdim=True).clamp(1e-4)
+    sf = x_amax / 448.0
+    x_scaled = (x * (1.0 / sf)).to(torch.float8_e4m3fn)
+    x_fp8 = torch.empty(
+        (num_blocks, block_size * (head_dim + 4)),
+        device=x.device,
+        dtype=torch.uint8,
+    )
+    x_fp8[:, :block_size * head_dim] = x_scaled.view(
+        num_blocks, block_size * head_dim).view(dtype=torch.uint8)
+    x_fp8[:,
+          block_size * head_dim:] = sf.view(num_blocks,
+                                            block_size).view(dtype=torch.uint8)
+    return x_fp8.view(num_blocks, block_size, num_heads, head_dim + 4)
+
+
+def per_custom_dims_cast_to_fp8(
+        x: torch.Tensor, dims: tuple,
+        use_ue8m0: bool) -> tuple[torch.Tensor, torch.Tensor]:
+    excluded_dims = tuple([i for i in range(x.dim()) if i not in set(dims)])
+    x_amax = x.abs().float().amax(dim=excluded_dims, keepdim=True).clamp(1e-4)
+    sf = x_amax / 448.0
+    sf = _ceil_to_ue8m0(sf) if use_ue8m0 else sf
+    x_scaled = (x * (1.0 / sf)).to(torch.float8_e4m3fn)
+    return x_scaled, sf.squeeze()
+
+
+def _generate_cp_test_data(seq_len: int, seq_len_kv: int):
+    assert seq_len_kv % seq_len == 0 and seq_len % 2 == 0
+    chunk_size = seq_len // 2
+    cp_size = seq_len_kv // seq_len
+    cp_id = cp_size // 3
+    ks = torch.zeros(seq_len, dtype=torch.int, device="cuda")
+    ke = torch.zeros(seq_len, dtype=torch.int, device="cuda")
+    for i in range(chunk_size):
+        ke[i] = cp_id * chunk_size + i
+        ke[i + chunk_size] = (cp_size * 2 - 1 - cp_id) * chunk_size + i
+    return ks, ke
+
+
+def _ref_fp8_mqa_logits(
+    q: torch.Tensor,
+    kv: torch.Tensor,
+    weights: torch.Tensor,
+    cu_seqlen_ks: torch.Tensor,
+    cu_seqlen_ke: torch.Tensor,
+):
+    seq_len_kv = kv.shape[0]
+
+    k = kv
+    q = q.float()
+    k = k.float()
+
+    mask_lo = (torch.arange(0, seq_len_kv, device="cuda")[None, :]
+               >= cu_seqlen_ks[:, None])
+    mask_hi = (torch.arange(0, seq_len_kv, device="cuda")[None, :]
+               < cu_seqlen_ke[:, None])
+    mask = mask_lo & mask_hi
+
+    score = torch.einsum("mhd,and->hmn", q, k)
+    logits = (score.relu() * weights.unsqueeze(-1).transpose(0, 1)).sum(dim=0)
+    logits = logits.masked_fill(~mask, float("-inf"))
+
+    return logits
+
+
+@pytest.mark.skipif(not current_platform.is_cuda(), reason="CUDA only")
+@pytest.mark.skipif(not has_deep_gemm(), reason="DeepGEMM not available")
+@pytest.mark.skipif(not current_platform.has_device_capability(90),
+                    reason="SM90 and SM100 only")
+def test_deepgemm_fp8_mqa_logits():
+    torch.manual_seed(0)
+    random.seed(0)
+    num_heads, head_dim = 32, 128
+    for seq_len in (512, ):
+        for seq_len_kv in (1024, ):
+            for disable_cp in (False, True):
+                q = torch.randn(
+                    seq_len,
+                    num_heads,
+                    head_dim,
+                    device="cuda",
+                    dtype=torch.bfloat16,
+                )
+                kv = torch.randn(seq_len_kv,
+                                 head_dim,
+                                 device="cuda",
+                                 dtype=torch.bfloat16)
+                weights = torch.randn(seq_len,
+                                      num_heads,
+                                      device="cuda",
+                                      dtype=torch.float32)
+
+                if disable_cp:
+                    ks = torch.zeros(seq_len, dtype=torch.int, device="cuda")
+                    ke = torch.arange(seq_len, dtype=torch.int,
+                                      device="cuda") + (seq_len_kv - seq_len)
+                else:
+                    ks, ke = _generate_cp_test_data(seq_len, seq_len_kv)
+
+                q_fp8 = q.to(torch.float8_e4m3fn)
+                kv_fp8 = per_custom_dims_cast_to_fp8(kv, (0, ), False)
+                logits = fp8_mqa_logits(q_fp8, kv_fp8, weights, ks, ke)
+
+                ref_logits = _ref_fp8_mqa_logits(
+                    q=q,
+                    kv=kv,
+                    weights=weights,
+                    cu_seqlen_ks=ks,
+                    cu_seqlen_ke=ke,
+                )
+
+                ref_neginf_mask = ref_logits == float("-inf")
+                neginf_mask = logits == float("-inf")
+                assert torch.equal(neginf_mask, ref_neginf_mask)
+
+                ref_logits = ref_logits.masked_fill(ref_neginf_mask, 0)
+                logits = logits.masked_fill(neginf_mask, 0)
+                diff = calc_diff(logits, ref_logits)
+                assert diff < 1e-3, f"{diff=}"
+
+
+def _ref_fp8_paged_mqa_logits(
+    q: torch.Tensor,
+    kv_cache: torch.Tensor,
+    weights: torch.Tensor,
+    context_lens: torch.Tensor,
+    block_tables: torch.Tensor,
+    max_model_len: int,
+):
+    batch_size, next_n, _, _ = q.size()
+    _, block_size, _, _ = kv_cache.size()
+    logits = torch.full(
+        [batch_size * next_n, max_model_len],
+        float("-inf"),
+        device=q.device,
+        dtype=torch.float32,
+    )
+    context_lens_list = context_lens.tolist()
+    for i in range(batch_size):
+        context_len = context_lens_list[i]
+        q_offsets = torch.arange(context_len - next_n,
+                                 context_len,
+                                 device="cuda")
+        weight_slice = (weights[i * next_n:(i + 1) * next_n, :].transpose(
+            0, 1).contiguous())
+        for block_rk in range(cdiv(context_len, block_size)):
+            block_idx = block_tables[i][block_rk]
+            qx, kx = q[i], kv_cache[block_idx]
+            k_offsets = torch.arange(
+                block_rk * block_size,
+                (block_rk + 1) * block_size,
+                device="cuda",
+            )
+            mask = (k_offsets[None, :] < context_len) & (k_offsets[None, :]
+                                                         <= q_offsets[:, None])
+            s = torch.where(
+                mask[None, :, :],
+                (qx.transpose(0, 1) @ kx.transpose(0, 1).transpose(1, 2)).to(
+                    logits.dtype),
+                float("-inf"),
+            )
+            s = torch.relu(s) * weight_slice[..., None]
+            s = s.sum(dim=0)
+            logits[
+                i * next_n:(i + 1) * next_n,
+                block_rk * block_size:(block_rk + 1) * block_size,
+            ] = torch.where(k_offsets[None, :] <= q_offsets[:, None], s,
+                            float("-inf"))
+    return logits
+
+
+@pytest.mark.skipif(not current_platform.is_cuda(), reason="CUDA only")
+@pytest.mark.skipif(not has_deep_gemm(), reason="DeepGEMM not available")
+@pytest.mark.skipif(not current_platform.has_device_capability(90),
+                    reason="SM90 and SM100 only")
+def test_deepgemm_fp8_paged_mqa_logits():
+    torch.manual_seed(0)
+    random.seed(0)
+
+    max_model_len = 4096
+    for batch_size, next_n in [(4, 1), (2, 2)]:
+        for heads, index_dim in [(32, 128)]:
+            for avg_kv in (2048, ):
+                num_blocks, blocksize = max_model_len * 2, 64
+
+                q = torch.randn(
+                    (batch_size, next_n, heads, index_dim),
+                    device="cuda",
+                    dtype=torch.bfloat16,
+                )
+                kv_cache = torch.randn(
+                    (num_blocks, blocksize, 1, index_dim),
+                    device="cuda",
+                    dtype=torch.bfloat16,
+                )
+                weights = torch.randn(
+                    (batch_size * next_n, heads),
+                    device="cuda",
+                    dtype=torch.float32,
+                )
+
+                context_lens = (torch.randint(int(0.8 * avg_kv),
+                                              int(1.2 * avg_kv),
+                                              (batch_size, )).cuda().to(
+                                                  torch.int32))
+                max_block_len = ((context_lens.max().item() + blocksize - 1) //
+                                 blocksize * blocksize)
+                block_tables = torch.zeros(
+                    (batch_size, max_block_len),
+                    device="cuda",
+                    dtype=torch.int32,
+                )
+
+                counter = 0
+                block_idx_pool = list(range(num_blocks))
+                random.shuffle(block_idx_pool)
+                for i in range(batch_size):
+                    ctx_len = int(context_lens[i].item())
+                    for j in range((ctx_len + blocksize - 1) // blocksize):
+                        block_tables[i][j] = block_idx_pool[counter]
+                        counter += 1
+
+                q_fp8 = q.to(torch.float8_e4m3fn)
+                kv_cache_fp8 = kv_cache_cast_to_fp8(kv_cache)
+
+                schedule_metadata = get_paged_mqa_logits_metadata(
+                    context_lens, blocksize, get_num_sms())
+                logits = fp8_paged_mqa_logits(
+                    q_fp8,
+                    kv_cache_fp8,
+                    weights,
+                    context_lens,
+                    block_tables,
+                    schedule_metadata,
+                    max_model_len,
+                )
+
+                ref_logits = _ref_fp8_paged_mqa_logits(
+                    q,
+                    kv_cache,
+                    weights,
+                    context_lens,
+                    block_tables,
+                    max_model_len,
+                )
+
+                positions = (torch.arange(max_model_len,
+                                          device="cuda").unsqueeze(0).expand(
+                                              batch_size * next_n, -1))
+                row_indices = (
+                    torch.arange(batch_size * next_n, device="cuda") // next_n)
+                next_n_offset = (
+                    torch.arange(batch_size * next_n, device="cuda") % next_n)
+                mask = positions <= (context_lens[row_indices] - next_n +
+                                     next_n_offset).unsqueeze(1)
+
+                logits = logits.masked_fill(~mask, 0)
+                ref_logits = ref_logits.masked_fill(~mask, 0)
+                diff = calc_diff(logits, ref_logits)
+                assert diff < 1e-3, f"{diff=}"

tests/kernels/attention/test_flashmla.py

@@ -97,18 +97,16 @@ def test_flash_mla(b, s_q, mean_sk, h_q, h_kv, d, dv, block_size, causal,
         descale_k = None
 
     def flash_mla():
-        return flash_mla_with_kvcache(
-            q,
-            blocked_k,
-            block_table,
-            cache_seqlens,
-            dv,
-            tile_scheduler_metadata,
-            num_splits,
-            causal=causal,
-            descale_q=descale_q,
-            descale_k=descale_k,
-        )
+        return flash_mla_with_kvcache(q,
+                                      blocked_k,
+                                      block_table,
+                                      cache_seqlens,
+                                      dv,
+                                      tile_scheduler_metadata,
+                                      num_splits,
+                                      causal=causal,
+                                      descale_q=descale_q,
+                                      descale_k=descale_k)
 
     def scaled_dot_product_attention(query, key, value, is_causal=False):
         query = query.float()

tests/kernels/attention/test_flashmla_sparse.py

@@ -0,0 +1,119 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+import pytest
+import torch
+
+
+def _cuda_sm90_available() -> bool:
+    if not torch.cuda.is_available():
+        return False
+    major, _ = torch.cuda.get_device_capability()
+    return major == 9
+
+
+def test_sparse_flashmla_metadata_smoke():
+    import vllm.attention.ops.flashmla as fm
+    ok, reason = fm.is_flashmla_supported()
+    if not ok or not _cuda_sm90_available():
+        pytest.skip(reason or "SM90 not available")
+
+    device = torch.device("cuda")
+    batch_size = 1
+    seqlen_q = 1
+    num_heads_q = 128
+    num_heads_k = 1
+    q_seq_per_hk = seqlen_q * num_heads_q // num_heads_k
+    topk = 128
+
+    cache_seqlens = torch.zeros(batch_size, dtype=torch.int32, device=device)
+
+    tile_md, num_splits = fm.get_mla_metadata(cache_seqlens,
+                                              q_seq_per_hk,
+                                              num_heads_k,
+                                              num_heads_q=num_heads_q,
+                                              topk=topk,
+                                              is_fp8_kvcache=True)
+    assert tile_md.dtype == torch.int32
+    assert num_splits.dtype == torch.int32
+
+
+def test_sparse_flashmla_decode_smoke():
+    import vllm.attention.ops.flashmla as fm
+    ok, reason = fm.is_flashmla_supported()
+    if not ok or not _cuda_sm90_available():
+        pytest.skip(reason or "SM90 not available")
+
+    device = torch.device("cuda")
+    batch_size = 1
+    seqlen_q = 1
+    num_heads_q = 1
+    head_dim_k = 576
+    head_dim_v = 512
+    num_heads_k = 1
+    page_block_size = 64
+    bytes_per_token = 656
+    topk = 128
+
+    # Metadata
+    q_seq_per_hk = seqlen_q * num_heads_q // num_heads_k
+    # q_heads_per_hk = num_heads_q // num_heads_k
+    cache_seqlens = torch.zeros(batch_size, dtype=torch.int32, device=device)
+    tile_md, num_splits = fm.get_mla_metadata(cache_seqlens,
+                                              q_seq_per_hk,
+                                              num_heads_k,
+                                              num_heads_q=num_heads_q,
+                                              topk=topk,
+                                              is_fp8_kvcache=True)
+
+    # Inputs
+    q = torch.zeros((batch_size, seqlen_q, num_heads_q, head_dim_k),
+                    dtype=torch.bfloat16,
+                    device=device)
+    k_cache = torch.zeros((1, page_block_size, num_heads_k, bytes_per_token),
+                          dtype=torch.uint8,
+                          device=device)
+    indices = torch.zeros((batch_size, seqlen_q, topk),
+                          dtype=torch.int32,
+                          device=device)
+
+    block_table = torch.zeros((batch_size, 128),
+                              dtype=torch.int32,
+                              device=device)
+    out, lse = fm.flash_mla_with_kvcache(q,
+                                         k_cache,
+                                         block_table,
+                                         cache_seqlens,
+                                         head_dim_v,
+                                         tile_md,
+                                         num_splits,
+                                         indices=indices,
+                                         is_fp8_kvcache=True)
+    assert out.shape[0] == batch_size
+    assert out.shape[-1] == head_dim_v
+    assert lse.shape[0] == batch_size
+
+
+def test_sparse_flashmla_prefill_smoke():
+    import vllm.attention.ops.flashmla as fm
+    ok, reason = fm.is_flashmla_supported()
+    if not ok or not _cuda_sm90_available():
+        pytest.skip(reason or "SM90 not available")
+
+    device = torch.device("cuda")
+    s_q = 1
+    s_kv = 1
+    h_q = 64  # kernel expects multiple of 64
+    h_kv = 1
+    d_qk = 576
+    d_v = 512
+    topk = 128
+
+    q = torch.zeros((s_q, h_q, d_qk), dtype=torch.bfloat16, device=device)
+    kv = torch.zeros((s_kv, h_kv, d_qk), dtype=torch.bfloat16, device=device)
+    indices = torch.zeros((s_q, h_kv, topk), dtype=torch.int32, device=device)
+
+    out, max_logits, lse = fm.flash_mla_sparse_prefill(q, kv, indices, 1.0,
+                                                       d_v)
+    assert out.shape == (s_q, h_q, d_v)
+    assert max_logits.shape == (s_q, h_q)
+    assert lse.shape == (s_q, h_q)

tests/kernels/attention/test_pack_unpack_triton.py

@@ -0,0 +1,245 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+
+import torch
+from torch.testing import assert_close
+
+from vllm.attention.ops.common import pack_seq_triton, unpack_seq_triton
+
+
+def test_pack_seq_basic_fp8():
+    """Test basic functionality of pack_seq_triton with fp8 and 3D tensors."""
+    device = "cuda"
+    dtype = torch.float8_e4m3fn
+
+    # Test cases with 3D tensors (N, H, D)
+    test_cases = [
+        (6, 8, 4, 2, [3, 3]),  # (6, 8, 4) -> (2, 3, 8, 4)
+        (10, 4, 8, 3, [2, 4, 4]),  # (10, 4, 8) -> (3, 4, 4, 8)
+        (20, 16, 32, 4, [5, 5, 5, 5]),  # (20, 16, 32) -> (4, 5, 16, 32)
+    ]
+
+    for N, H, D, B, lengths_list in test_cases:
+        # Create input tensor with small values for fp8
+        x = torch.randn(N, H, D, dtype=torch.float32, device=device) * 0.1
+        x = x.to(dtype=dtype)
+        lengths = torch.tensor(lengths_list, device=device)
+
+        # Pack the data
+        packed = pack_seq_triton(x, lengths)
+
+        # Check output shape and properties
+        expected_shape = (B, max(lengths_list), H, D)
+        assert packed.shape == expected_shape
+        assert packed.dtype == dtype
+        assert packed.device == x.device
+
+        # Check that valid data is preserved (within fp8 precision)
+        for b in range(B):
+            start_idx = sum(lengths_list[:b])
+            seq_len = lengths_list[b]
+
+            expected_data = x[start_idx:start_idx + seq_len].to(torch.float32)
+            actual_data = packed[b, :seq_len].to(torch.float32)
+
+            assert_close(actual_data, expected_data, rtol=1e-1, atol=1e-2)
+
+
+def test_pack_seq_custom_padding_fp8():
+    """Test pack_seq_triton with custom padding values for fp8."""
+    device = "cuda"
+    dtype = torch.float8_e4m3fn
+    N, H, D, B = 20, 8, 16, 2
+    lengths = torch.tensor([10, 10], device=device)
+
+    x = torch.randn(N, H, D, dtype=torch.float32, device=device) * 0.1
+    x = x.to(dtype=dtype)
+
+    # Test with different padding values
+    for pad_value in [-100.0, -10.0, 0.0, 10.0, 100.0]:
+        result = pack_seq_triton(x, lengths, pad_value=pad_value)
+
+        # Check valid data
+        for b in range(B):
+            start_idx = b * 10
+            expected_data = x[start_idx:start_idx + 10].to(torch.float32)
+            actual_data = result[b, :10].to(torch.float32)
+            assert_close(actual_data, expected_data, rtol=1e-1, atol=1e-2)
+
+        # Check padding (fp8 has limited range, so check for large values)
+        padded_data = result[:, 10:].to(torch.float32)
+        if pad_value < 0:
+            assert torch.all(padded_data < -50)  # Large negative values
+        elif pad_value > 0:
+            assert torch.all(padded_data > 50)  # Large positive values
+        else:
+            assert torch.allclose(padded_data,
+                                  torch.zeros_like(padded_data),
+                                  atol=1e-2)
+
+
+def test_pack_seq_default_negative_inf_padding_fp8():
+    """Test that pack_seq_triton uses -inf padding by default for fp8."""
+    device = "cuda"
+    dtype = torch.float8_e4m3fn
+    # B = 2
+    N, H, D = 20, 8, 16
+    lengths = torch.tensor([10, 10], device=device)
+
+    x = torch.randn(N, H, D, dtype=torch.float32, device=device) * 0.1
+    x = x.to(dtype=dtype)
+    result = pack_seq_triton(x, lengths)
+
+    # Check that padding is large negative values (fp8 representation of -inf)
+    padded_data = result[:, 10:].to(torch.float32)
+    assert torch.all(
+        padded_data < -100)  # fp8 -inf is represented as large negative number
+
+
+def test_pack_seq_edge_cases_fp8():
+    """Test pack_seq_triton with edge cases for fp8."""
+    device = "cuda"
+    dtype = torch.float8_e4m3fn
+
+    # Test with single batch element
+    x = torch.randn(10, 8, 16, dtype=torch.float32, device=device) * 0.1
+    x = x.to(dtype=dtype)
+    lengths = torch.tensor([10], device=device)
+    result = pack_seq_triton(x, lengths)
+    assert result.shape == (1, 10, 8, 16)
+
+    # Test with very short sequences
+    x = torch.randn(20, 4, 8, dtype=torch.float32, device=device) * 0.1
+    x = x.to(dtype=dtype)
+    lengths = torch.tensor([1, 1, 1], device=device)
+    result = pack_seq_triton(x, lengths)
+    assert result.shape == (3, 1, 4, 8)
+
+    # Test with different sequence lengths
+    x = torch.randn(15, 8, 16, dtype=torch.float32, device=device) * 0.1
+    x = x.to(dtype=dtype)
+    lengths = torch.tensor([5, 7, 3], device=device)
+    result = pack_seq_triton(x, lengths)
+    assert result.shape == (3, 7, 8, 16)
+
+
+def test_pack_seq_different_block_sizes_fp8():
+    """Test pack_seq_triton with different block sizes for fp8."""
+    device = "cuda"
+    dtype = torch.float8_e4m3fn
+    N, H, D, B = 100, 16, 32, 4
+    lengths = torch.tensor([25, 25, 25, 25], device=device)
+
+    x = torch.randn(N, H, D, dtype=torch.float32, device=device) * 0.1
+    x = x.to(dtype=dtype)
+
+    # Test different block sizes
+    for block_t, block_d in [(32, 32), (64, 64), (128, 128)]:
+        result = pack_seq_triton(x, lengths, block_t=block_t, block_d=block_d)
+
+        assert result.shape == (B, 25, H, D)
+
+        # Check that valid data is preserved (within fp8 precision)
+        for b in range(B):
+            start_idx = b * 25
+            expected_data = x[start_idx:start_idx + 25].to(torch.float32)
+            actual_data = result[b, :25].to(torch.float32)
+            assert_close(actual_data, expected_data, rtol=1e-1, atol=1e-2)
+
+
+def test_pack_seq_shape_consistency():
+    """Test that pack_seq_triton maintains shape consistency."""
+    device = "cuda"
+    dtype = torch.float8_e4m3fn
+    N, H, D, B = 20, 8, 16, 2
+    lengths = torch.tensor([10, 10], device=device)
+
+    x = torch.randn(N, H, D, dtype=torch.float32, device=device) * 0.1
+    x = x.to(dtype=dtype)
+
+    result = pack_seq_triton(x, lengths)
+
+    # Check shape consistency
+    assert result.shape[0] == B  # Batch dimension
+    assert result.shape[1] == lengths.max().item()  # Max sequence length
+    assert result.shape[2:] == x.shape[1:]  # Feature dimensions preserved
+
+
+def test_pack_unpack_roundtrip_fp8():
+    """Test that pack -> unpack gives us back the original data for fp8."""
+    device = "cuda"
+    dtype = torch.float8_e4m3fn
+
+    # Test cases with 3D tensors
+    test_cases = [
+        (6, 8, 4, 2, [3, 3]),
+        (10, 4, 8, 3, [2, 4, 4]),
+        (20, 16, 32, 4, [5, 5, 5, 5]),
+        (15, 8, 16, 3, [7, 5, 3]),
+    ]
+
+    for N, H, D, B, lengths_list in test_cases:
+        # Create input tensor with small values for fp8
+        x = torch.randn(N, H, D, dtype=torch.float32, device=device) * 0.1
+        x = x.to(dtype=dtype)
+        lengths = torch.tensor(lengths_list, device=device)
+
+        # Pack the data
+        packed = pack_seq_triton(x, lengths)
+
+        # Unpack the data
+        unpacked = unpack_seq_triton(packed, lengths)
+
+        # Check that we get back the original data (within fp8 precision)
+        assert unpacked.shape == x.shape
+        x_f32 = x.to(torch.float32)
+        unpacked_f32 = unpacked.to(torch.float32)
+        assert_close(x_f32, unpacked_f32, rtol=1e-3, atol=1e-3)
+
+        # Unpack without explicit start locations (computed in kernel)
+        unpacked_with_loc = unpack_seq_triton(packed, lengths)
+        assert_close(x_f32,
+                     unpacked_with_loc.to(torch.float32),
+                     rtol=1e-3,
+                     atol=1e-2)
+
+
+def test_unpack_seq_triton_edge_cases_fp8():
+    """Test unpack function with edge cases for fp8."""
+    device = "cuda"
+    dtype = torch.float8_e4m3fn
+
+    # Test with single batch element
+    x = torch.randn(10, 8, 16, dtype=torch.float32, device=device) * 0.1
+    x = x.to(dtype=dtype)
+    lengths = torch.tensor([10], device=device)
+    packed = pack_seq_triton(x, lengths)
+    unpacked = unpack_seq_triton(packed, lengths)
+    assert unpacked.shape == x.shape
+    assert_close(x.to(torch.float32),
+                 unpacked.to(torch.float32),
+                 rtol=1e-1,
+                 atol=1e-2)
+
+    # Test with very short sequences
+    x = torch.randn(20, 4, 8, dtype=torch.float32, device=device) * 0.1
+    x = x.to(dtype=dtype)
+    lengths = torch.tensor([1, 1, 1], device=device)
+    packed = pack_seq_triton(x, lengths)
+    unpacked = unpack_seq_triton(packed, lengths)
+    # Only compare the first 3 elements that were actually packed
+    assert_close(x[:3].to(torch.float32),
+                 unpacked.to(torch.float32),
+                 rtol=1e-1,
+                 atol=1e-2)
+
+    x = torch.randn(15, 8, 16, dtype=torch.float32, device=device) * 0.1
+    x = x.to(dtype=dtype)
+    lengths = torch.tensor([5, 7, 3], device=device)
+    packed = pack_seq_triton(x, lengths)
+    unpacked = unpack_seq_triton(packed, lengths)
+    assert unpacked.shape == x.shape
+    assert_close(x.to(torch.float32),
+                 unpacked.to(torch.float32),
+                 rtol=1e-1,
+                 atol=1e-2)

tests/model_executor/conftest.py

@@ -1,52 +0,0 @@
-# SPDX-License-Identifier: Apache-2.0
-# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
-
-import pytest
-
-
-@pytest.fixture
-def sample_regex():
-    return (r"((25[0-5]|(2[0-4]|1\d|[1-9]|)\d)\.){3}"
-            r"(25[0-5]|(2[0-4]|1\d|[1-9]|)\d)")
-
-
-@pytest.fixture
-def sample_json_schema():
-    return {
-        "type": "object",
-        "properties": {
-            "name": {
-                "type": "string"
-            },
-            "age": {
-                "type": "integer"
-            },
-            "skills": {
-                "type": "array",
-                "items": {
-                    "type": "string",
-                    "maxLength": 10
-                },
-                "minItems": 3
-            },
-            "work_history": {
-                "type": "array",
-                "items": {
-                    "type": "object",
-                    "properties": {
-                        "company": {
-                            "type": "string"
-                        },
-                        "duration": {
-                            "type": "number"
-                        },
-                        "position": {
-                            "type": "string"
-                        }
-                    },
-                    "required": ["company", "position"]
-                }
-            }
-        },
-        "required": ["name", "age", "skills", "work_history"]
-    }

tests/model_executor/model_loader/tensorizer_loader/conftest.py

@@ -10,7 +10,7 @@ from vllm.model_executor.model_loader import tensorizer as tensorizer_mod
 from vllm.model_executor.model_loader.tensorizer import TensorizerConfig
 from vllm.utils import get_distributed_init_method, get_ip, get_open_port
 from vllm.v1.executor.abstract import UniProcExecutor
-from vllm.worker.worker_base import WorkerWrapperBase
+from vllm.v1.worker.worker_base import WorkerWrapperBase
 
 MODEL_REF = "facebook/opt-125m"
 

tests/model_executor/model_loader/tensorizer_loader/test_tensorizer.py

@@ -14,6 +14,7 @@ import pytest
 import torch
 
 import vllm.model_executor.model_loader.tensorizer
+from tests.utils import VLLM_PATH, RemoteOpenAIServer
 from vllm import LLM, SamplingParams
 from vllm.engine.arg_utils import EngineArgs
 # yapf: disable
@@ -27,7 +28,6 @@ from vllm.model_executor.model_loader.tensorizer_loader import (
 # yapf: enable
 from vllm.utils import PlaceholderModule
 
-from ..utils import VLLM_PATH, RemoteOpenAIServer
 from .conftest import DummyExecutor, assert_from_collective_rpc
 
 try:

tests/models/registry.py

@@ -207,6 +207,7 @@ _TEXT_GENERATION_EXAMPLE_MODELS = {
                                          trust_remote_code=True),
     "DeepseekV3ForCausalLM": _HfExamplesInfo("deepseek-ai/DeepSeek-V3",  # noqa: E501
                                          trust_remote_code=True),
+    "DeepseekV32ForCausalLM": _HfExamplesInfo("deepseek-ai/DeepSeek-V3.2-Exp"),
     "Ernie4_5ForCausalLM": _HfExamplesInfo("baidu/ERNIE-4.5-0.3B-PT",
                                             min_transformers_version="4.54"),
     "Ernie4_5_MoeForCausalLM": _HfExamplesInfo("baidu/ERNIE-4.5-21B-A3B-PT",
@@ -298,9 +299,6 @@ _TEXT_GENERATION_EXAMPLE_MODELS = {
     "MistralForCausalLM": _HfExamplesInfo("mistralai/Mistral-7B-Instruct-v0.1"),
     "MixtralForCausalLM": _HfExamplesInfo("mistralai/Mixtral-8x7B-Instruct-v0.1",  # noqa: E501
                                           {"tiny": "TitanML/tiny-mixtral"}),  # noqa: E501
-    "MotifForCausalLM": _HfExamplesInfo("Motif-Technologies/Motif-2.6B",
-                                        trust_remote_code=True,
-                                        v0_only=True),
     "MptForCausalLM": _HfExamplesInfo("mpt", is_available_online=False),
     "MPTForCausalLM": _HfExamplesInfo("mosaicml/mpt-7b"),
     "NemotronForCausalLM": _HfExamplesInfo("nvidia/Minitron-8B-Base"),
@@ -642,7 +640,7 @@ _SPECULATIVE_DECODING_EXAMPLE_MODELS = {
                                     speculative_model="baidu/ERNIE-4.5-21B-A3B-PT"),
     "Glm4MoeMTPModel": _HfExamplesInfo("zai-org/GLM-4.5",
                                         speculative_model="zai-org/GLM-4.5",
-                                        min_transformers_version="4.54",
+                                        min_transformers_version="4.56",
                                         is_available_online=False),
     "LongCatFlashMTPModel": _HfExamplesInfo(
         "meituan-longcat/LongCat-Flash-Chat",
@@ -651,6 +649,9 @@ _SPECULATIVE_DECODING_EXAMPLE_MODELS = {
     "MiMoMTPModel": _HfExamplesInfo("XiaomiMiMo/MiMo-7B-RL",
                                     trust_remote_code=True,
                                     speculative_model="XiaomiMiMo/MiMo-7B-RL"),
+    "Eagle3Qwen2_5vlForCausalLM": _HfExamplesInfo(
+        "Qwen/Qwen2.5-VL-7B-Instruct",
+        speculative_model="Rayzl/qwen2.5-vl-7b-eagle3-sgl"),
     "Qwen3NextMTP": _HfExamplesInfo("Qwen/Qwen3-Next-80B-A3B-Instruct",
                                      min_transformers_version="4.56.3"),
 }

tests/models/test_initialization.py

@@ -8,7 +8,8 @@ import pytest
 
 from vllm import LLM
 from vllm.utils import GiB_bytes
-from vllm.v1.core.kv_cache_utils import get_kv_cache_configs
+from vllm.v1.core.kv_cache_utils import (generate_scheduler_kv_cache_config,
+                                         get_kv_cache_configs)
 from vllm.v1.engine.core import EngineCore as V1EngineCore
 
 from ..utils import create_new_process_for_each_test
@@ -62,11 +63,13 @@ def can_initialize(model_arch: str, monkeypatch: pytest.MonkeyPatch,
     # Avoid calling model.forward()
     def _initialize_kv_caches_v1(self, vllm_config):
         kv_cache_specs = self.model_executor.get_kv_cache_specs()
-        scheduler_kv_cache_config = get_kv_cache_configs(
+        kv_cache_configs = get_kv_cache_configs(
             vllm_config,
             kv_cache_specs,
             [10 * GiB_bytes],
-        )[0]
+        )
+        scheduler_kv_cache_config = generate_scheduler_kv_cache_config(
+            kv_cache_configs)
 
         # gpu_blocks (> 0), cpu_blocks, scheduler_kv_cache_config
         return 1, 0, scheduler_kv_cache_config
@@ -76,10 +79,6 @@ def can_initialize(model_arch: str, monkeypatch: pytest.MonkeyPatch,
         if model_info.v0_only:
             # NOTE(woosuk): skip the test for V0-only models
             return
-
-        if model_arch in ("Phi4FlashForCausalLM", "MotifForCausalLM"):
-            pytest.skip(
-                "Differential Flash Attention backend has been removed.")
         if model_arch == "GptOssForCausalLM":
             # FIXME: A hack to bypass FA3 assertion because our CI's L4 GPU
             # has cc==8.9 which hasn't supported FA3 yet. Remove this hack when

tests/models/test_transformers.py

@@ -100,10 +100,9 @@ def test_distributed(
                          kwargs_test=kwargs)
 
 
-@pytest.mark.skipif(
-    current_platform.is_rocm(),
-    reason="bitsandbytes quantization is currently not supported in rocm.")
 @pytest.mark.parametrize("model, quantization_kwargs", [
+    ("TheBloke/TinyLlama-1.1B-Chat-v0.3-AWQ", {}),
+    ("TheBloke/TinyLlama-1.1B-Chat-v0.3-GPTQ", {}),
     (
         "meta-llama/Llama-3.2-1B-Instruct",
         {
@@ -121,6 +120,11 @@ def test_quantization(
     max_tokens: int,
     num_logprobs: int,
 ) -> None:
+    if (current_platform.is_rocm()
+            and quantization_kwargs.get("quantization", "") == "bitsandbytes"):
+        pytest.skip(
+            "bitsandbytes quantization is currently not supported in rocm.")
+
     with vllm_runner(
             model, model_impl="auto", enforce_eager=True,
             **quantization_kwargs) as vllm_model:  # type: ignore[arg-type]

tests/models/test_vision.py

@@ -18,7 +18,7 @@ from vllm.utils import get_open_port, update_environment_variables
 
 
 @pytest.mark.parametrize(
-    ("feature_sample_layers", "num_layers_loaded", "max_possible_layers",
+    ("select_layers", "num_layers_loaded", "max_possible_layers",
      "expected_features"),
     [
         # All layers loaded
@@ -28,8 +28,8 @@ from vllm.utils import get_open_port, update_environment_variables
         ([1, 10], 10, 20, [1, 10]),
         ([-20, -11], 10, 20, [1, 10]),
     ])
-def test_resolve_visual_encoder_outputs(feature_sample_layers,
-                                        num_layers_loaded, max_possible_layers,
+def test_resolve_visual_encoder_outputs(select_layers, num_layers_loaded,
+                                        max_possible_layers,
                                         expected_features):
     """
     Test that offsets are correctly handled for vision feature layers.
@@ -39,9 +39,10 @@ def test_resolve_visual_encoder_outputs(feature_sample_layers,
     ]
     output_tensor = resolve_visual_encoder_outputs(
         encoder_outputs=encoder_outputs,
-        feature_sample_layers=feature_sample_layers,
         post_layer_norm=None,
-        max_possible_layers=max_possible_layers)
+        select_layers=select_layers,
+        max_possible_layers=max_possible_layers,
+    )
     assert torch.equal(torch.tensor(expected_features), output_tensor)
 
 

tests/multimodal/test_utils.py

@@ -66,7 +66,12 @@ async def test_fetch_image_http(image_url: str):
 @pytest.mark.parametrize("suffix", get_supported_suffixes())
 async def test_fetch_image_base64(url_images: dict[str, Image.Image],
                                   raw_image_url: str, suffix: str):
-    connector = MediaConnector()
+    connector = MediaConnector(
+        # Domain restriction should not apply to data URLs.
+        allowed_media_domains=[
+            "www.bogotobogo.com",
+            "github.com",
+        ])
     url_image = url_images[raw_image_url]
 
     try:
@@ -387,3 +392,29 @@ def test_argsort_mm_positions(case):
     modality_idxs = argsort_mm_positions(mm_positions)
 
     assert modality_idxs == expected_modality_idxs
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize("video_url", TEST_VIDEO_URLS)
+@pytest.mark.parametrize("num_frames", [-1, 32, 1800])
+async def test_allowed_media_domains(video_url: str, num_frames: int):
+    connector = MediaConnector(
+        media_io_kwargs={"video": {
+            "num_frames": num_frames,
+        }},
+        allowed_media_domains=[
+            "www.bogotobogo.com",
+            "github.com",
+        ])
+
+    video_sync, metadata_sync = connector.fetch_video(video_url)
+    video_async, metadata_async = await connector.fetch_video_async(video_url)
+    assert np.array_equal(video_sync, video_async)
+    assert metadata_sync == metadata_async
+
+    disallowed_url = "https://upload.wikimedia.org/wikipedia/commons/4/47/PNG_transparency_demonstration_1.png"
+    with pytest.raises(ValueError):
+        _, _ = connector.fetch_video(disallowed_url)
+
+    with pytest.raises(ValueError):
+        _, _ = await connector.fetch_video_async(disallowed_url)

tests/plugins/vllm_add_dummy_platform/vllm_add_dummy_platform/dummy_platform.py

@@ -26,5 +26,5 @@ class DummyPlatform(Platform):
 
     def get_attn_backend_cls(self, backend_name, head_size, dtype,
                              kv_cache_dtype, block_size, use_v1, use_mla,
-                             has_sink):
+                             has_sink, use_sparse):
         return "vllm_add_dummy_platform.dummy_attention_backend.DummyAttentionBackend"  # noqa E501

tests/quantization/test_blackwell_moe.py

@@ -0,0 +1,132 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+
+import json
+import os
+
+import pytest
+
+from tests.utils import RemoteOpenAIServer
+from vllm.platforms import current_platform
+
+if not current_platform.is_device_capability(100):
+    pytest.skip("This test only runs on Blackwell GPUs (SM100).",
+                allow_module_level=True)
+
+os.environ["FLASHINFER_NVCC_THREADS"] = "16"
+
+# dummy_hf_overrides = {"num_layers": 4, "num_hidden_layers": 4,
+# "text_config": {"num_layers": 4, "num_hidden_layers": 4}}
+dummy_hf_overrides = {"num_layers": 4, "num_hidden_layers": 4}
+
+
+def can_initialize(model: str, extra_args: list[str]):
+
+    # Server arguments
+    server_args = [
+        "--max-model-len",
+        "2048",
+        "--max-num-batched-tokens",
+        "256",
+        "--load-format",
+        "dummy",
+        "--trust-remote-code",
+        "--limit-mm-per-prompt",
+        json.dumps({"image": 0}),
+        *extra_args,
+    ]
+
+    # Launch server and make a simple request
+    with RemoteOpenAIServer(
+            model,
+            server_args,
+            max_wait_seconds=1000,  # Due to FlashInfer compile
+            override_hf_configs=dummy_hf_overrides) as server:
+        client = server.get_client()
+        # Make a simple request to verify the server works
+        completion = client.completions.create(
+            model=model,
+            prompt=["Hello, World!"],
+            temperature=0,
+            max_tokens=2,
+        )
+        print(completion)
+        assert completion.choices[0].text is not None
+
+
+## Llama4 ##
+
+
+@pytest.mark.skip(reason=(
+    "RuntimeError: run_moe() Expected a value of type "
+    "'Optional[List[Tensor]]' for argument '_9' but instead found type "
+    "'list'."))
+def test_llama4_fp8_tensor_moe_flashinfer_cutlass(
+        monkeypatch: pytest.MonkeyPatch):
+    monkeypatch.setenv("VLLM_USE_FLASHINFER_MOE_FP8", "1")
+    monkeypatch.setenv("VLLM_FLASHINFER_MOE_BACKEND", "throughput")
+    can_initialize("nvidia/Llama-4-Scout-17B-16E-Instruct-FP8", [])
+
+
+@pytest.mark.skip(reason="Works, but takes too long to run")
+def test_llama4_fp8_tensor_moe_flashinfer_trtllm(
+        monkeypatch: pytest.MonkeyPatch):
+    monkeypatch.setenv("VLLM_USE_FLASHINFER_MOE_FP8", "1")
+    monkeypatch.setenv("VLLM_FLASHINFER_MOE_BACKEND", "latency")
+    can_initialize("nvidia/Llama-4-Scout-17B-16E-Instruct-FP8", [])
+
+
+@pytest.mark.skip(reason="Works, but takes too long to run")
+def test_llama4_nvfp4_moe_flashinfer_cutlass(monkeypatch: pytest.MonkeyPatch):
+    monkeypatch.setenv("VLLM_USE_FLASHINFER_MOE_FP4", "1")
+    monkeypatch.setenv("VLLM_FLASHINFER_MOE_BACKEND", "throughput")
+    can_initialize("nvidia/Llama-4-Scout-17B-16E-Instruct-FP4", [])
+
+
+@pytest.mark.skip(reason="RuntimeError: No kernel found for the given options")
+def test_llama4_nvfp4_moe_flashinfer_trtllm(monkeypatch: pytest.MonkeyPatch):
+    monkeypatch.setenv("VLLM_USE_FLASHINFER_MOE_FP4", "1")
+    monkeypatch.setenv("VLLM_FLASHINFER_MOE_BACKEND", "latency")
+    can_initialize("nvidia/Llama-4-Scout-17B-16E-Instruct-FP4", [])
+
+
+## DeepSeekV3 ##
+
+
+def test_deepseek_fp8_block_moe_deep_gemm(monkeypatch: pytest.MonkeyPatch):
+    monkeypatch.setenv("VLLM_USE_DEEP_GEMM", "1")
+    can_initialize("deepseek-ai/DeepSeek-V3.1", [])
+
+
+def test_deepseek_nvfp4_moe_flashinfer_cutlass(
+        monkeypatch: pytest.MonkeyPatch):
+    monkeypatch.setenv("VLLM_USE_FLASHINFER_MOE_FP4", "1")
+    monkeypatch.setenv("VLLM_FLASHINFER_MOE_BACKEND", "throughput")
+    can_initialize("nvidia/DeepSeek-R1-0528-FP4-v2", [])
+
+
+@pytest.mark.skip(reason="RuntimeError: No kernel found for the given options")
+def test_deepseek_nvfp4_moe_flashinfer_trtllm(monkeypatch: pytest.MonkeyPatch):
+    monkeypatch.setenv("VLLM_USE_FLASHINFER_MOE_FP4", "1")
+    monkeypatch.setenv("VLLM_FLASHINFER_MOE_BACKEND", "latency")
+    can_initialize("nvidia/DeepSeek-R1-0528-FP4-v2", [])
+
+
+## GPT-OSS ##
+
+
+def test_gptoss_mxfp4bf16_moe_flashinfer(monkeypatch: pytest.MonkeyPatch):
+    monkeypatch.setenv("VLLM_USE_FLASHINFER_MOE_MXFP4_BF16", "1")
+    can_initialize("openai/gpt-oss-20b", [])
+
+
+def test_gptoss_mxfp4mxfp8_moe_flashinfer_cutlass(
+        monkeypatch: pytest.MonkeyPatch):
+    monkeypatch.setenv("VLLM_USE_FLASHINFER_MOE_MXFP4_MXFP8_CUTLASS", "1")
+    can_initialize("openai/gpt-oss-20b", [])
+
+
+def test_gptoss_mxfp4mxfp8_moe_flashinfer_trtllm(
+        monkeypatch: pytest.MonkeyPatch):
+    monkeypatch.setenv("VLLM_USE_FLASHINFER_MOE_MXFP4_MXFP8", "1")
+    can_initialize("openai/gpt-oss-20b", [])

tests/reasoning/test_glm4_moe_reasoning_parser.py

@@ -0,0 +1,203 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+
+import pytest
+from transformers import AutoTokenizer
+
+from tests.reasoning.utils import run_reasoning_extraction
+from vllm.reasoning import ReasoningParser, ReasoningParserManager
+
+parser_name = "glm45"
+start_token = "<think>"
+end_token = "</think>"
+
+REASONING_MODEL_NAME = "zai-org/GLM-4.5"
+
+
+@pytest.fixture(scope="module")
+def glm45_tokenizer():
+    return AutoTokenizer.from_pretrained(REASONING_MODEL_NAME)
+
+
+WITH_THINK = {
+    "output": "<think>This is a reasoning section</think>This is the rest",
+    "reasoning_content": "This is a reasoning section",
+    "content": "This is the rest",
+    "is_reasoning_end": True,
+}
+
+WITH_THINK_STREAM = {
+    "output": "<think>This is a reasoning section</think>This is the rest",
+    "reasoning_content": "This is a reasoning section",
+    "content": "This is the rest",
+    "is_reasoning_end": True,
+}
+
+WITHOUT_THINK = {
+    "output": "This is the rest",
+    "reasoning_content": None,
+    "content": "This is the rest",
+    "is_reasoning_end": False,
+}
+
+WITHOUT_THINK_STREAM = {
+    "output": "This is the rest",
+    "reasoning_content": None,
+    "content": "This is the rest",
+    "is_reasoning_end": False,
+}
+
+COMPLETE_REASONING = {
+    "output": "<think>This is a reasoning section</think>",
+    "reasoning_content": "This is a reasoning section",
+    "content": None,
+    "is_reasoning_end": True,
+}
+MULTILINE_REASONING = {
+    "output":
+    "<think>This is a reasoning\nsection</think>This is the rest\nThat",
+    "reasoning_content": "This is a reasoning\nsection",
+    "content": "This is the rest\nThat",
+    "is_reasoning_end": True,
+}
+ONLY_OPEN_TAG = {
+    "output": "<think>This is a reasoning section",
+    "reasoning_content": None,
+    "content": "<think>This is a reasoning section",
+    "is_reasoning_end": False,
+}
+
+ONLY_OPEN_TAG_STREAM = {
+    "output": "<think>This is a reasoning section",
+    "reasoning_content": "This is a reasoning section",
+    "content": None,
+    "is_reasoning_end": False,
+}
+
+TEST_CASES = [
+    pytest.param(
+        False,
+        WITH_THINK,
+        id="with_think",
+    ),
+    pytest.param(
+        True,
+        WITH_THINK_STREAM,
+        id="with_think_stream",
+    ),
+    pytest.param(
+        False,
+        WITHOUT_THINK,
+        id="without_think",
+    ),
+    pytest.param(
+        True,
+        WITHOUT_THINK_STREAM,
+        id="without_think_stream",
+    ),
+    pytest.param(
+        False,
+        COMPLETE_REASONING,
+        id="complete_reasoning",
+    ),
+    pytest.param(
+        True,
+        COMPLETE_REASONING,
+        id="complete_reasoning_stream",
+    ),
+    pytest.param(
+        False,
+        MULTILINE_REASONING,
+        id="multiline_reasoning",
+    ),
+    pytest.param(
+        True,
+        MULTILINE_REASONING,
+        id="multiline_reasoning_stream",
+    ),
+    pytest.param(
+        False,
+        ONLY_OPEN_TAG,
+        id="only_open_tag",
+    ),
+    pytest.param(
+        True,
+        ONLY_OPEN_TAG_STREAM,
+        id="only_open_tag_stream",
+    ),
+]
+
+STILL_REASONING_PROMPT = """[gMASK]<sop><|system|>
+You are a helpful assistant.<|user|>
+What is the capital of France?<|assistant|>
+<think>The user is asking for the capital of"""
+
+DONE_REASONING_PROMPT = """[gMASK]<sop><|system|>
+You are a helpful assistant.<|user|>
+What is the capital of France?<|assistant|>
+<think>The user is asking for the capital of France.</think>
+The capital of France is Paris."""
+
+MULTI_TURN_STILL_REASONING_PROMPT = """[gMASK]<sop><|system|>
+You are a helpful assistant.<|user|>
+What is the capital of France?<|assistant|>
+<think></think>
+The capital of France is Paris.<|user|>
+What about Chile?<|assistant|>
+<think>The user is asking for the capital of"""
+
+MULTI_TURN_DONE_REASONING_PROMPT = """[gMASK]<sop><|system|>
+You are a helpful assistant.<|user|>
+What is the capital of France?<|assistant|>
+<think></think>
+The capital of France is Paris.<|user|>
+What about Chile?<|assistant|>
+<think>The user is asking for the capital of Chile.</think>
+The capital of Chile is Santiago."""
+
+REASONING_END_TEST_CASES = [
+    pytest.param(STILL_REASONING_PROMPT, False, id="still_reasoning"),
+    pytest.param(DONE_REASONING_PROMPT, True, id="done_reasoning"),
+    pytest.param(MULTI_TURN_STILL_REASONING_PROMPT,
+                 False,
+                 id="multi_turn_still_reasoning"),
+    pytest.param(MULTI_TURN_DONE_REASONING_PROMPT,
+                 True,
+                 id="multi_turn_done_reasoning")
+]
+
+
+@pytest.mark.parametrize("streaming, param_dict", TEST_CASES)
+def test_reasoning(
+    streaming: bool,
+    param_dict: dict,
+    glm45_tokenizer,
+):
+    output = glm45_tokenizer.tokenize(param_dict["output"])
+    output_tokens: list[str] = [
+        glm45_tokenizer.convert_tokens_to_string([token]) for token in output
+    ]
+    parser: ReasoningParser = ReasoningParserManager.get_reasoning_parser(
+        parser_name)(glm45_tokenizer)
+
+    reasoning, content = run_reasoning_extraction(parser,
+                                                  output_tokens,
+                                                  streaming=streaming)
+
+    assert reasoning == param_dict["reasoning_content"]
+    assert content == param_dict["content"]
+
+    output_ids = glm45_tokenizer.convert_tokens_to_ids(output)
+    is_reasoning_end = parser.is_reasoning_end(output_ids)
+    assert is_reasoning_end == param_dict["is_reasoning_end"]
+
+
+@pytest.mark.parametrize("prompt, is_reasoning_end", REASONING_END_TEST_CASES)
+def test_is_reasoning_end_full_prompt(prompt: str, is_reasoning_end: bool,
+                                      glm45_tokenizer):
+    parser: ReasoningParser = ReasoningParserManager.get_reasoning_parser(
+        parser_name)(glm45_tokenizer)
+    tokens = glm45_tokenizer.tokenize(prompt)
+    token_ids = glm45_tokenizer.convert_tokens_to_ids(tokens)
+    check_is_reasoning_end = parser.is_reasoning_end(token_ids)
+    assert check_is_reasoning_end == is_reasoning_end

tests/speculative_decoding/speculators/test_eagle3.py

@@ -14,6 +14,9 @@ from vllm.model_executor.models.interfaces import supports_eagle3
     pytest.param(
         "nm-testing/Speculator-Qwen3-8B-Eagle3-converted-071-quantized",
         id="qwen3-eagle3-speculator"),
+    pytest.param(
+        "nm-testing/Speculator-Qwen3-8B-Eagle3-converted-071-quantized-w4a16",
+        id="qwen3-eagle3-speculator-w4a16-verifier"),
 ])
 def test_eagle3_speculators_model(vllm_runner, example_prompts, model_path,
                                   monkeypatch):

tests/utils.py

@@ -91,8 +91,10 @@ class RemoteOpenAIServer:
         env['VLLM_WORKER_MULTIPROC_METHOD'] = 'spawn'
         if env_dict is not None:
             env.update(env_dict)
+        serve_cmd = ["vllm", "serve", model, *vllm_serve_args]
+        print(f"Launching RemoteOpenAIServer with: {' '.join(serve_cmd)}")
         self.proc: subprocess.Popen = subprocess.Popen(
-            ["vllm", "serve", model, *vllm_serve_args],
+            serve_cmd,
             env=env,
             stdout=sys.stdout,
             stderr=sys.stderr,
@@ -1141,6 +1143,8 @@ def get_attn_backend_list_based_on_platform() -> list[str]:
             print("Skip FLASH_ATTN on ROCm as aiter is not installed")
 
         return attn_backend_list
+    elif current_platform.is_xpu():
+        return ["FLASH_ATTN", "TRITON_ATTN"]
     else:
         raise ValueError("Unsupported platform")
 

tests/utils_/test_gc_utils.py

@@ -0,0 +1,69 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+from dataclasses import dataclass
+from typing import Any
+
+from vllm.utils.gc_utils import (GCDebugConfig, _compute_detailed_type,
+                                 _compute_top_gc_collected_objects)
+
+
+@dataclass
+class Normal:
+    v: int
+
+
+@dataclass
+class ListWrapper:
+    vs: list[int]
+
+    def __len__(self) -> int:
+        return len(self.vs)
+
+
+def test_compute_detailed_type():
+    assert _compute_detailed_type(
+        Normal(v=8)) == "<class 'tests.utils_.test_gc_utils.Normal'>"
+
+    assert _compute_detailed_type([1, 2, 3]) == "<class 'list'>(size:3)"
+    assert _compute_detailed_type({4, 5}) == "<class 'set'>(size:2)"
+    assert _compute_detailed_type({6: 7}) == "<class 'dict'>(size:1)"
+    assert _compute_detailed_type(ListWrapper(
+        vs=[])) == "<class 'tests.utils_.test_gc_utils.ListWrapper'>(size:0)"
+
+
+def test_compute_top_gc_collected_objects():
+    objects: list[Any] = [[1, 2, 3], [4, 5, 6], [7, 8, 9], [10, 11, 12],
+                          {13, 14}, {
+                              15: 16,
+                              17: 18
+                          },
+                          Normal(v=19),
+                          Normal(v=20),
+                          Normal(v=21)]
+    assert _compute_top_gc_collected_objects(objects, top=-1) == ""
+    assert _compute_top_gc_collected_objects(objects, top=0) == ""
+    assert _compute_top_gc_collected_objects(
+        objects, top=1) == "    4:<class 'list'>(size:3)"
+    assert _compute_top_gc_collected_objects(objects, top=2) == "\n".join([
+        "    4:<class 'list'>(size:3)",
+        "    3:<class 'tests.utils_.test_gc_utils.Normal'>"
+    ])
+    assert _compute_top_gc_collected_objects(objects, top=3) == "\n".join([
+        "    4:<class 'list'>(size:3)",
+        "    3:<class 'tests.utils_.test_gc_utils.Normal'>",
+        "    1:<class 'set'>(size:2)"
+    ])
+
+
+def test_gc_debug_config():
+    assert not GCDebugConfig(None).enabled
+    assert not GCDebugConfig("").enabled
+    assert not GCDebugConfig("0").enabled
+
+    config = GCDebugConfig("1")
+    assert config.enabled
+    assert config.top_objects == -1
+
+    config = GCDebugConfig("{\"top_objects\":5}")
+    assert config.enabled
+    assert config.top_objects == 5

tests/v1/attention/test_mla_backends.py

@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: Apache-2.0
 # SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """Tests for v1 MLA backends without GPUModelRunner dependency."""
+from typing import Optional, Union
 
 import pytest
 import torch
@@ -10,6 +11,7 @@ from tests.v1.attention.utils import (BatchSpec, _Backend,
                                       create_standard_kv_cache_spec,
                                       create_vllm_config,
                                       get_attention_backend)
+from vllm import _custom_ops as ops
 from vllm.utils import STR_DTYPE_TO_TORCH_DTYPE, cdiv
 from vllm.v1.attention.backends.utils import CommonAttentionMetadata
 from vllm.v1.kv_cache_interface import FullAttentionSpec
@@ -78,7 +80,9 @@ def create_and_prepopulate_kv_cache(
         device: torch.device,
         num_blocks: int,
         common_attn_metadata: CommonAttentionMetadata,
-        randomize_blocks: bool = True) -> torch.Tensor:
+        randomize_blocks: bool = True,
+        kv_cache_dtype: Optional[str] = None,
+        scale: Union[float, torch.Tensor] = 1.0) -> torch.Tensor:
     """Create and prepopulate an MLA KV cache with context data.
     
     Args:
@@ -93,6 +97,11 @@ def create_and_prepopulate_kv_cache(
         common_attn_metadata: Common attention metadata
         randomize_blocks: Whether to randomly permute blocks 
                           or use sequential order
+        kv_cache_dtype: Optional kv cache dtype string. When set to
+                        "fp8_ds_mla" the cache is populated using the
+                        fp8 DeepSeek MLA layout via concat_and_cache_mla.
+        scale: Scaling factor forwarded to concat_and_cache_mla when the
+               fp8 cache layout is requested.
         
     Returns:
         MLA KV cache tensor
@@ -105,23 +114,61 @@ def create_and_prepopulate_kv_cache(
     block_table = common_attn_metadata.block_table_tensor
     slot_mapping = common_attn_metadata.slot_mapping
 
-    # Create MLA KV cache: (num_blocks, block_size, head_size)
-    kv_cache = torch.empty(num_blocks,
-                           block_size,
-                           head_size,
-                           dtype=dtype,
-                           device=device)
-    kv_cache_flat = kv_cache.view(-1, head_size)
+    use_fp8_ds_mla = kv_cache_dtype == "fp8_ds_mla"
+
+    if use_fp8_ds_mla:
+        if not kv_c_contexts:
+            raise ValueError("kv_c_contexts cannot be empty when using"
+                             " fp8_ds_mla cache dtype")
+        kv_lora_rank = kv_c_contexts[0].shape[-1]
+        rope_dim = k_pe_contexts[0].shape[-1]
+        entry_size = kv_lora_rank + 4 * 4 + 2 * rope_dim
+        kv_cache = torch.zeros(num_blocks,
+                               block_size,
+                               entry_size,
+                               dtype=torch.uint8,
+                               device=device)
+        scale_tensor = (scale
+                        if isinstance(scale, torch.Tensor) else torch.tensor(
+                            scale, dtype=torch.float32, device=device))
+        scale_tensor = scale_tensor.to(device=device, dtype=torch.float32)
+    else:
+        # Create MLA KV cache: (num_blocks, block_size, head_size)
+        kv_cache = torch.empty(num_blocks,
+                               block_size,
+                               head_size,
+                               dtype=dtype,
+                               device=device)
+        kv_cache_flat = kv_cache.view(-1, head_size)
 
     # Populate the cache with the context tokens
     # Start from block_id=1 since block_id=0 is considered the null block
     start_block_idx = 1
     for i in range(batch_size):
         kv_c_context, k_pe_context = kv_c_contexts[i], k_pe_contexts[i]
-        kv_context = torch.cat([kv_c_context, k_pe_context.squeeze(1)], dim=-1)
+        context_len = kv_c_context.shape[0]
+        if context_len == 0:
+            start_block_idx += cdiv(int(seq_lens[i]), block_size)
+            continue
+
         start = start_block_idx * block_size
-        end = start + kv_context.shape[0]
-        kv_cache_flat[start:end, ...] = kv_context
+
+        if use_fp8_ds_mla:
+            slots = torch.arange(context_len, device=device,
+                                 dtype=torch.long) + start
+            ops.concat_and_cache_mla(
+                kv_c_context,
+                k_pe_context.squeeze(1),
+                kv_cache,
+                slots,
+                kv_cache_dtype="fp8_ds_mla",
+                scale=scale_tensor,
+            )
+        else:
+            kv_context = torch.cat(
+                [kv_c_context, k_pe_context.squeeze(1)], dim=-1)
+            end = start + kv_context.shape[0]
+            kv_cache_flat[start:end, ...] = kv_context
 
         # Stay block aligned and allocate enough blocks for the new tokens
         start_block_idx += cdiv(int(seq_lens[i]), block_size)

tests/v1/attention/test_sparse_mla_backends.py

@@ -0,0 +1,426 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+"""Unit tests for the FlashMLA sparse backend utilities."""
+
+import math
+from types import MethodType, SimpleNamespace
+
+import numpy as np
+import pytest
+import torch
+
+from tests.v1.attention.test_mla_backends import (
+    BATCH_SPECS, BatchSpec, MockAttentionLayer,
+    create_and_prepopulate_kv_cache)
+from tests.v1.attention.utils import (create_common_attn_metadata,
+                                      create_standard_kv_cache_spec,
+                                      create_vllm_config)
+from vllm import _custom_ops as ops
+from vllm.attention.ops import flashmla
+from vllm.model_executor.layers.linear import ColumnParallelLinear
+from vllm.utils import cdiv
+from vllm.v1.attention.backends.mla.flashmla_sparse import (
+    FlashMLASparseBackend, FlashMLASparseDecodeAndContextMetadata,
+    FlashMLASparseImpl, FlashMLASparseMetadata)
+
+SPARSE_BACKEND_BATCH_SPECS = {
+    name: BATCH_SPECS[name]
+    for name in [
+        "mixed_small",
+        "mixed_medium",
+        "small_prefill",
+        "medium_prefill",
+        "single_prefill",
+    ]
+}
+
+SPARSE_BACKEND_BATCH_SPECS["large_q_prefill"] = BatchSpec(seq_lens=[1024] * 2,
+                                                          query_lens=[256] * 2)
+SPARSE_BACKEND_BATCH_SPECS["large_q_pure_prefill"] = BatchSpec(
+    seq_lens=[256] * 2, query_lens=[256] * 2)
+
+
+def _dequantize_fp8_ds_mla_entry(
+        cache_slice: torch.Tensor, kv_lora_rank: int, rope_dim: int,
+        dtype: torch.dtype) -> tuple[torch.Tensor, torch.Tensor]:
+    """Dequantize a single fp8_ds_mla cache entry back to latent + rope."""
+
+    # The first kv_lora_rank bytes store FP8 latent values with one scale per
+    # 128 element tile written as float32 right after the latent payload.
+    scales = cache_slice.view(torch.float32)[kv_lora_rank //
+                                             4:kv_lora_rank // 4 + 4]
+    latent = torch.empty(kv_lora_rank,
+                         dtype=torch.float16,
+                         device=cache_slice.device)
+    for tile_idx in range(4):
+        tile_start = tile_idx * 128
+        tile_end = tile_start + 128
+        ops.convert_fp8(latent[tile_start:tile_end],
+                        cache_slice[tile_start:tile_end],
+                        float(scales[tile_idx].item()),
+                        kv_dtype="fp8")
+    latent = latent.to(dtype)
+
+    rope_offset = kv_lora_rank // 2 + 8
+    rope_vals = cache_slice.view(dtype)[rope_offset:rope_offset + rope_dim]
+    return latent, rope_vals.clone()
+
+
+def _quantize_dequantize_fp8_ds_mla(
+        kv_c: torch.Tensor, k_pe: torch.Tensor, block_size: int,
+        scale: torch.Tensor) -> tuple[torch.Tensor, torch.Tensor]:
+    """Round-trip kv_c/k_pe though the fp8_ds_mla cache layout."""
+
+    if kv_c.numel() == 0:
+        return kv_c.clone(), k_pe.clone()
+
+    kv_lora_rank = kv_c.shape[-1]
+    rope_dim = k_pe.shape[-1]
+    num_tokens = kv_c.shape[0]
+    num_blocks = max(1, math.ceil(num_tokens / block_size))
+    entry_size = kv_lora_rank + 4 * 4 + 2 * rope_dim
+
+    tmp_cache = torch.zeros(num_blocks,
+                            block_size,
+                            entry_size,
+                            dtype=torch.uint8,
+                            device=kv_c.device)
+    slot_mapping = torch.arange(num_tokens,
+                                dtype=torch.long,
+                                device=kv_c.device)
+
+    ops.concat_and_cache_mla(kv_c,
+                             k_pe,
+                             tmp_cache,
+                             slot_mapping,
+                             kv_cache_dtype="fp8_ds_mla",
+                             scale=scale)
+
+    dequant_kv_c = torch.empty_like(kv_c)
+    dequant_k_pe = torch.empty_like(k_pe)
+
+    for token_idx in range(num_tokens):
+        slot = slot_mapping[token_idx].item()
+        block_idx = slot // block_size
+        block_offset = slot % block_size
+        cache_slice = tmp_cache[block_idx, block_offset]
+        latent, rope_vals = _dequantize_fp8_ds_mla_entry(
+            cache_slice, kv_lora_rank, rope_dim, kv_c.dtype)
+        dequant_kv_c[token_idx] = latent
+        dequant_k_pe[token_idx] = rope_vals
+
+    return dequant_kv_c, dequant_k_pe
+
+
+def test_sparse_backend_metadata_registration():
+    backend = FlashMLASparseBackend
+
+    assert backend.get_name() == "FLASHMLA_SPARSE_VLLM_V1"
+    assert backend.get_metadata_cls() is FlashMLASparseMetadata
+    assert backend.get_impl_cls() is FlashMLASparseImpl
+
+    dtype_list = backend.get_supported_dtypes()
+    assert torch.bfloat16 in dtype_list
+
+    shape = backend.get_kv_cache_shape(num_blocks=2,
+                                       block_size=64,
+                                       num_kv_heads=1,
+                                       head_size=576)
+    assert shape == (2, 64, 576)
+
+
+def test_sparse_decode_metadata_filters_prefill_indices():
+    prefill_context_lengths = torch.tensor([4, 2], dtype=torch.int32)
+    metadata = FlashMLASparseDecodeAndContextMetadata(
+        scheduler_metadata=torch.tensor([[0]], dtype=torch.int32),
+        num_splits=torch.tensor([1, 1], dtype=torch.int32),
+        cache_lens=torch.tensor([10, 12], dtype=torch.int32),
+        prefill_context_lengths=prefill_context_lengths,
+    )
+
+    indices = torch.tensor([[0, 3, 5], [1, 2, 4]], dtype=torch.int32)
+
+    context_indices, new_token_indices = metadata.filter_prefill_indices(
+        indices)
+
+    expected_context = torch.tensor([[-1, -1, 5], [-1, -1, 4]],
+                                    dtype=torch.int32)
+    expected_new_tokens = torch.tensor([[-1, -1, 1], [-1, 0, 2]],
+                                       dtype=torch.int32)
+
+    assert torch.equal(context_indices, expected_context)
+    assert torch.equal(new_token_indices, expected_new_tokens)
+
+
+def test_sparse_impl_zero_fills_when_metadata_missing():
+    impl = FlashMLASparseImpl.__new__(FlashMLASparseImpl)
+    dummy_layer = object()
+    q = torch.zeros((2, 1, 3))
+    k_c = torch.zeros((2, 3))
+    k_pe = torch.zeros((2, 1, 1))
+    kv_cache = torch.zeros((1, 1, 1))
+    output = torch.ones((2, 4))
+
+    result = FlashMLASparseImpl.forward(impl,
+                                        dummy_layer,
+                                        q,
+                                        k_c,
+                                        k_pe,
+                                        kv_cache,
+                                        attn_metadata=None,
+                                        output=output)
+
+    assert result is output
+    assert torch.all(result == 0)
+
+
+@pytest.mark.parametrize("batch_name", list(SPARSE_BACKEND_BATCH_SPECS.keys()))
+@pytest.mark.parametrize("kv_cache_dtype", ["fp8_ds_mla", "auto"])
+def test_sparse_backend_decode_correctness(dist_init, batch_name,
+                                           kv_cache_dtype):
+    if not torch.cuda.is_available():
+        pytest.skip("CUDA is required for sparse MLA decode test")
+
+    device = torch.device("cuda")
+    dtype = torch.bfloat16
+
+    batch_spec = SPARSE_BACKEND_BATCH_SPECS[batch_name]
+
+    # Model hyper-parameters (kept intentionally small for the unit test)
+    num_heads = 128
+    kv_lora_rank = 512
+    qk_nope_head_dim = 128
+    qk_rope_head_dim = 64
+    v_head_dim = 128
+    head_size = kv_lora_rank + qk_rope_head_dim
+    topk_tokens = 2048
+
+    max_seqlen = max(batch_spec.seq_lens)
+    total_cache_tokens = sum(batch_spec.seq_lens)
+    block_size = 64
+
+    vllm_config = create_vllm_config(
+        model_name="deepseek-ai/DeepSeek-V2-Lite-Chat",
+        max_model_len=max_seqlen,
+        num_gpu_blocks=max(2048,
+                           cdiv(total_cache_tokens, block_size) + 1),
+        block_size=block_size)
+    model_config = vllm_config.model_config
+    model_config.hf_config = SimpleNamespace(
+        attn_module_list_cfg=[{
+            "topk_tokens": topk_tokens
+        }])
+    model_config.hf_text_config = SimpleNamespace(
+        q_lora_rank=None,
+        kv_lora_rank=kv_lora_rank,
+        qk_nope_head_dim=qk_nope_head_dim,
+        qk_rope_head_dim=qk_rope_head_dim,
+        v_head_dim=v_head_dim,
+        model_type="deepseek_v2",
+    )
+    model_config.dtype = dtype
+    model_config.get_num_attention_heads = MethodType(
+        lambda self, parallel_config: num_heads, model_config)
+    model_config.get_num_kv_heads = MethodType(lambda self, parallel_config: 1,
+                                               model_config)
+    model_config.get_head_size = MethodType(lambda self: head_size,
+                                            model_config)
+    model_config.get_sliding_window = MethodType(lambda self: None,
+                                                 model_config)
+
+    kv_cache_spec = create_standard_kv_cache_spec(vllm_config)
+
+    torch.manual_seed(0)
+
+    scale = 1.0 / math.sqrt(head_size)
+
+    # Shared MLA projection weights to keep reference and backend in sync
+    W_UK = torch.randn(kv_lora_rank,
+                       num_heads,
+                       qk_nope_head_dim,
+                       dtype=dtype,
+                       device=device)
+    W_UV = torch.randn(kv_lora_rank,
+                       num_heads,
+                       v_head_dim,
+                       dtype=dtype,
+                       device=device)
+
+    # Build synthetic decode-only workload
+    seq_lens = batch_spec.seq_lens
+    query_lens = batch_spec.query_lens
+
+    all_q_vllm, all_kv_c_vllm, all_k_pe_vllm = [], [], []
+    kv_c_contexts, k_pe_contexts = [], []
+    reference_outputs = []
+
+    kv_cache_scale = torch.tensor(1.0, dtype=torch.float32, device=device)
+
+    for i in range(batch_spec.batch_size):
+        s_len = seq_lens[i]
+        q_len = query_lens[i]
+        ctx_len = s_len - q_len
+
+        q_c = torch.rand(q_len,
+                         num_heads,
+                         qk_nope_head_dim + qk_rope_head_dim,
+                         dtype=dtype,
+                         device=device)
+        kv_c_full = torch.rand(s_len, kv_lora_rank, dtype=dtype, device=device)
+        k_pe_full = torch.rand(s_len,
+                               1,
+                               qk_rope_head_dim,
+                               dtype=dtype,
+                               device=device)
+
+        kv_c_full, k_pe_full = _quantize_dequantize_fp8_ds_mla(
+            kv_c_full,
+            k_pe_full.squeeze(1),
+            block_size=vllm_config.cache_config.block_size,
+            scale=kv_cache_scale,
+        )
+
+        q_nope, q_pe = q_c.split([qk_nope_head_dim, qk_rope_head_dim], dim=-1)
+        ql_nope = torch.einsum("qnh,lnh->qnl", q_nope, W_UK)
+        q_mqa = torch.cat([ql_nope, q_pe], dim=-1)
+
+        k_mqa = torch.cat([kv_c_full, k_pe_full], dim=-1)
+        k_mqa = k_mqa.unsqueeze(1).expand(-1, num_heads, -1)
+        v_mqa = kv_c_full.unsqueeze(1).expand(-1, num_heads, -1)
+
+        attn_mask = torch.ones(q_len, s_len, dtype=torch.bool, device=device)
+        causal_mask = torch.tril(torch.ones(q_len, q_len, device=device))
+        attn_mask[:, ctx_len:] = causal_mask
+
+        q_sdpa_in = q_mqa.unsqueeze(0).transpose(1, 2)
+        k_sdpa_in = k_mqa.unsqueeze(0).transpose(1, 2)
+        v_sdpa_in = v_mqa.unsqueeze(0).transpose(1, 2)
+
+        sdpa_out = torch.nn.functional.scaled_dot_product_attention(
+            q_sdpa_in, k_sdpa_in, v_sdpa_in, attn_mask=attn_mask, scale=scale)
+        sdpa_out = sdpa_out.transpose(1, 2).squeeze(0)
+
+        sdpa_out = torch.einsum("qnl,lnv->qnv", sdpa_out, W_UV)
+        reference_outputs.append(sdpa_out.flatten(start_dim=-2))
+
+        all_q_vllm.append(q_c)
+        all_kv_c_vllm.append(kv_c_full[ctx_len:])
+        all_k_pe_vllm.append(k_pe_full[ctx_len:])
+        kv_c_contexts.append(kv_c_full[:ctx_len + 1])
+        k_pe_contexts.append(k_pe_full[:ctx_len + 1])
+
+    query_vllm = torch.cat(all_q_vllm, dim=0)
+    kv_c_vllm = torch.cat(all_kv_c_vllm, dim=0)
+    k_pe_vllm = torch.cat(all_k_pe_vllm, dim=0)
+    sdpa_reference = torch.cat(reference_outputs, dim=0)
+
+    vllm_config.cache_config.cache_dtype = kv_cache_dtype
+
+    common_attn_metadata = create_common_attn_metadata(
+        batch_spec,
+        vllm_config.cache_config.block_size,
+        device,
+        arange_block_indices=True)
+
+    kv_cache = create_and_prepopulate_kv_cache(
+        kv_c_contexts=kv_c_contexts,
+        k_pe_contexts=k_pe_contexts,
+        block_size=vllm_config.cache_config.block_size,
+        head_size=head_size,
+        dtype=dtype,
+        device=device,
+        num_blocks=vllm_config.cache_config.num_gpu_blocks,
+        common_attn_metadata=common_attn_metadata,
+        randomize_blocks=False,
+        kv_cache_dtype=vllm_config.cache_config.cache_dtype,
+        scale=kv_cache_scale,
+    )
+
+    builder_cls = FlashMLASparseBackend.get_builder_cls()
+    builder = builder_cls(kv_cache_spec, ["placeholder"], vllm_config, device)
+    metadata = builder.build(common_prefix_len=0,
+                             common_attn_metadata=common_attn_metadata)
+
+    starts = np.asarray(common_attn_metadata.query_start_loc_cpu,
+                        dtype=np.int32)
+    seg_lengths = np.diff(starts)
+    positions = np.arange(starts[-1], dtype=np.int32) - np.repeat(
+        starts[:-1], seg_lengths)
+    seq_lengths = np.asarray(common_attn_metadata.seq_lens_cpu, dtype=np.int32)
+    prefix_lengths = seq_lengths - seg_lengths
+    positions += np.repeat(prefix_lengths, seg_lengths)
+
+    pos_gpu = torch.as_tensor(positions, device=device, dtype=torch.int32)
+    topk = metadata.topk_tokens
+    debug_indices = torch.arange(topk, device=device,
+                                 dtype=torch.int32).unsqueeze(0)
+    token_positions = pos_gpu.unsqueeze(1)
+    causal_mask = (debug_indices <= token_positions)
+    debug_indices = torch.where(causal_mask, debug_indices,
+                                torch.full_like(debug_indices, -1))
+
+    # FlashMLASparseImpl now reads top-k indices from the indexer-provided
+    # buffer, so emulate that contract with a simple namespace mock.
+    debug_indices = debug_indices.expand(metadata.num_actual_tokens,
+                                         -1).clone()
+    mock_indexer = SimpleNamespace(topk_indices_buffer=debug_indices)
+
+    ok, reason = flashmla.is_flashmla_supported()
+    if not ok:
+        pytest.skip(reason)
+
+    kv_b_proj_weight = torch.cat([W_UK, W_UV], dim=-1)
+    kv_b_proj_weight = kv_b_proj_weight.view(
+        kv_lora_rank, num_heads * (qk_nope_head_dim + v_head_dim))
+
+    mock_kv_b_proj = ColumnParallelLinear(input_size=kv_lora_rank,
+                                          output_size=num_heads *
+                                          (qk_nope_head_dim + v_head_dim),
+                                          bias=False).to(device=device,
+                                                         dtype=dtype)
+    mock_kv_b_proj.weight = torch.nn.Parameter(kv_b_proj_weight.T.contiguous())
+
+    impl_cls = FlashMLASparseBackend.get_impl_cls()
+    impl = impl_cls(num_heads=num_heads,
+                    head_size=head_size,
+                    scale=scale,
+                    num_kv_heads=1,
+                    alibi_slopes=None,
+                    sliding_window=None,
+                    kv_cache_dtype=vllm_config.cache_config.cache_dtype,
+                    logits_soft_cap=None,
+                    attn_type="decoder",
+                    kv_sharing_target_layer_name=None,
+                    q_lora_rank=None,
+                    kv_lora_rank=kv_lora_rank,
+                    qk_nope_head_dim=qk_nope_head_dim,
+                    qk_rope_head_dim=qk_rope_head_dim,
+                    qk_head_dim=qk_nope_head_dim + qk_rope_head_dim,
+                    v_head_dim=v_head_dim,
+                    kv_b_proj=mock_kv_b_proj,
+                    indexer=mock_indexer)
+
+    impl.process_weights_after_loading(dtype)
+
+    layer = MockAttentionLayer(device)
+    out_buffer = torch.empty(metadata.num_actual_tokens,
+                             num_heads * v_head_dim,
+                             dtype=dtype,
+                             device=device)
+
+    backend_output = impl.forward(layer,
+                                  query_vllm,
+                                  kv_c_vllm,
+                                  k_pe_vllm,
+                                  kv_cache,
+                                  metadata,
+                                  output=out_buffer)
+
+    assert backend_output.shape == sdpa_reference.shape
+    assert backend_output.dtype == sdpa_reference.dtype
+    assert torch.isfinite(backend_output).all()
+
+    torch.testing.assert_close(backend_output,
+                               sdpa_reference,
+                               rtol=0.5,
+                               atol=0.5)

tests/v1/attention/utils.py

@@ -3,7 +3,7 @@
 """Utility functions for attention-related v1 tests."""
 
 from dataclasses import dataclass
-from typing import Union
+from typing import Optional, Union
 
 import pytest
 import torch
@@ -168,7 +168,6 @@ def create_standard_kv_cache_spec(
             vllm_config.parallel_config),
         head_size=vllm_config.model_config.get_head_size(),
         dtype=vllm_config.model_config.dtype,
-        use_mla=vllm_config.model_config.use_mla,
         sliding_window=vllm_config.model_config.get_sliding_window(),
     )
 
@@ -260,3 +259,88 @@ def create_dummy_kv_cache(block_size: int,
         dtype=dtype,
         device=device)
     return kv_cache
+
+
+@dataclass
+class BackendConfig:
+    name: str
+    env_vars: dict
+    comp_config: dict  # compilation config
+    specific_gpu_arch: Optional[tuple] = None
+
+
+# Define all backend configurations of full cudagraph to be tested
+full_cg_backend_configs = {
+    # FA3 on Hopper
+    "FA3":
+    BackendConfig(name="FA3",
+                  env_vars={
+                      "VLLM_ATTENTION_BACKEND": "FLASH_ATTN",
+                      "VLLM_FLASH_ATTN_VERSION": "3",
+                      "VLLM_FLASH_ATTN_MAX_NUM_SPLITS_FOR_CUDA_GRAPH": "16",
+                  },
+                  comp_config={
+                      "cudagraph_mode": "FULL",
+                  },
+                  specific_gpu_arch=(9, 0)),
+    # FlashMLA on Hopper
+    "FlashMLA":
+    BackendConfig(name="FlashMLA",
+                  env_vars={
+                      "VLLM_ATTENTION_BACKEND": "FLASHMLA",
+                  },
+                  comp_config={
+                      "cudagraph_mode": "FULL_AND_PIECEWISE",
+                  },
+                  specific_gpu_arch=(9, 0)),
+    # Cutlass MLA on Blackwell
+    "CutlassMLA":
+    BackendConfig(
+        name="CutlassMLA",
+        env_vars={
+            "VLLM_USE_V1": "1",
+            "VLLM_ATTENTION_BACKEND": "CUTLASS_MLA",
+            "FORCE_NUM_KV_SPLITS":
+            "1",  # TODO: remove this when hang issue is fixed
+        },
+        comp_config={
+            "cudagraph_mode": "FULL_AND_PIECEWISE",
+        },
+        specific_gpu_arch=(10, 0)),
+    # FlashAttention MLA on Hopper
+    "FlashAttentionMLA":
+    BackendConfig(name="FlashAttentionMLA",
+                  env_vars={
+                      "VLLM_ATTENTION_BACKEND": "FLASH_ATTN_MLA",
+                      "VLLM_FLASH_ATTN_MAX_NUM_SPLITS_FOR_CUDA_GRAPH": "16",
+                  },
+                  comp_config={
+                      "cudagraph_mode": "FULL_DECODE_ONLY",
+                  },
+                  specific_gpu_arch=(9, 0)),
+    # FA2
+    "FA2":
+    BackendConfig(name="FA2",
+                  env_vars={
+                      "VLLM_ATTENTION_BACKEND": "FLASH_ATTN",
+                      "VLLM_FLASH_ATTN_VERSION": "2",
+                      "VLLM_FLASH_ATTN_MAX_NUM_SPLITS_FOR_CUDA_GRAPH": "16",
+                  },
+                  comp_config={
+                      "cudagraph_mode": "FULL_AND_PIECEWISE",
+                  }),
+    # Triton Attention
+    "TritonAttn":
+    BackendConfig(name="TritonAttn",
+                  env_vars={"VLLM_ATTENTION_BACKEND": "TRITON_ATTN"},
+                  comp_config={
+                      "cudagraph_mode": "FULL_AND_PIECEWISE",
+                  }),
+    # FlashInfer
+    "FlashInfer":
+    BackendConfig(name="FlashInfer",
+                  env_vars={"VLLM_ATTENTION_BACKEND": "FLASHINFER"},
+                  comp_config={
+                      "cudagraph_mode": "FULL_AND_PIECEWISE",
+                  }),
+}

tests/v1/core/test_kv_cache_utils.py

@@ -24,7 +24,8 @@ from vllm.v1.core.kv_cache_utils import (
     make_block_hash_with_group_id)
 from vllm.v1.kv_cache_interface import (FullAttentionSpec, KVCacheConfig,
                                         KVCacheGroupSpec, KVCacheSpec,
-                                        KVCacheTensor, SlidingWindowSpec,
+                                        KVCacheTensor, MLAAttentionSpec,
+                                        SlidingWindowSpec,
                                         UniformTypeKVCacheSpecs)
 from vllm.v1.metrics.stats import PrefixCacheStats
 from vllm.v1.request import Request
@@ -77,13 +78,11 @@ def new_kv_cache_spec(block_size=16,
                       num_kv_heads=2,
                       head_size=64,
                       dtype=torch.float32,
-                      use_mla=False,
                       sliding_window=None):
     return FullAttentionSpec(block_size=block_size,
                              num_kv_heads=num_kv_heads,
                              head_size=head_size,
                              dtype=dtype,
-                             use_mla=use_mla,
                              sliding_window=sliding_window)
 
 
@@ -91,13 +90,11 @@ def new_sliding_window_spec(block_size=16,
                             num_kv_heads=2,
                             head_size=64,
                             dtype=torch.float32,
-                            use_mla=False,
                             sliding_window=1):
     return SlidingWindowSpec(block_size=block_size,
                              num_kv_heads=num_kv_heads,
                              head_size=head_size,
                              dtype=dtype,
-                             use_mla=use_mla,
                              sliding_window=sliding_window)
 
 
@@ -894,7 +891,6 @@ def test_merge_kv_cache_spec():
             num_kv_heads=full_spec.num_kv_heads,
             head_size=full_spec.head_size,
             dtype=full_spec.dtype,
-            use_mla=full_spec.use_mla,
             sliding_window=1,
         ),
     ]
@@ -991,7 +987,6 @@ def test_estimate_max_model_len(model_id, max_model_len,
             num_kv_heads=32,
             head_size=128,
             dtype=torch.float16,
-            use_mla=False,
         )
     # Estimate the maximum model length, 16384 model_len need 8GB
     estimated_max_len = estimate_max_model_len(vllm_config, kv_cache_spec,
@@ -1022,7 +1017,6 @@ def test_get_max_concurrency_for_kv_cache_config():
         num_kv_heads=32,
         head_size=128,
         dtype=torch.float16,
-        use_mla=False,
     )
 
     sliding_window_spec = SlidingWindowSpec(
@@ -1030,7 +1024,6 @@ def test_get_max_concurrency_for_kv_cache_config():
         num_kv_heads=32,
         head_size=128,
         dtype=torch.float16,
-        use_mla=False,
         sliding_window=1024,
     )
 
@@ -1412,3 +1405,48 @@ def test_generate_scheduler_kv_cache_config():
             KVCacheGroupSpec(['layer_1', 'layer_2'], new_kv_cache_spec())
         ],
     )
+
+
+def new_mla_spec(cache_dtype_str=None):
+    return MLAAttentionSpec(block_size=16,
+                            num_kv_heads=16,
+                            head_size=64,
+                            dtype=torch.float32,
+                            cache_dtype_str=cache_dtype_str)
+
+
+def test_merge_mla_spec():
+    kv_cache_specs = [
+        new_mla_spec(),
+        new_mla_spec(),
+    ]
+    mla_spec = kv_cache_specs[0].merge(kv_cache_specs)
+    assert mla_spec == new_mla_spec()
+
+    kv_cache_specs = [
+        new_mla_spec(cache_dtype_str="fp8_ds_mla"),
+        new_mla_spec(cache_dtype_str="fp8_ds_mla"),
+    ]
+    mla_spec = kv_cache_specs[0].merge(kv_cache_specs)
+    assert mla_spec == new_mla_spec(cache_dtype_str="fp8_ds_mla")
+
+    kv_cache_specs = [
+        new_mla_spec(cache_dtype_str="fp8_ds_mla"),
+        new_mla_spec(cache_dtype_str=None),
+    ]
+    with pytest.raises(AssertionError):
+        kv_cache_specs[0].merge(kv_cache_specs)
+
+    kv_cache_specs = [
+        new_kv_cache_spec(),
+        new_mla_spec(),
+    ]
+    with pytest.raises(AssertionError):
+        kv_cache_specs[0].merge(kv_cache_specs)
+
+    kv_cache_specs = [
+        new_mla_spec(cache_dtype_str="fp8_ds_mla"),
+        new_kv_cache_spec(),
+    ]
+    with pytest.raises(AssertionError):
+        kv_cache_specs[0].merge(kv_cache_specs)

tests/v1/core/test_prefix_caching.py

@@ -76,7 +76,7 @@ def make_kv_cache_config(block_size: int, num_blocks: int) -> KVCacheConfig:
         kv_cache_groups=[
             KVCacheGroupSpec(
                 ["layer"],
-                FullAttentionSpec(block_size, 1, 1, torch.float32, False),
+                FullAttentionSpec(block_size, 1, 1, torch.float32),
             )
         ],
     )
@@ -90,7 +90,7 @@ def make_kv_cache_config_hybrid_model(block_size: int,
         kv_cache_groups=[
             KVCacheGroupSpec(
                 ["layer1"],
-                FullAttentionSpec(block_size, 1, 1, torch.float32, False),
+                FullAttentionSpec(block_size, 1, 1, torch.float32),
             ),
             KVCacheGroupSpec(
                 ["layer2"],
@@ -98,7 +98,6 @@ def make_kv_cache_config_hybrid_model(block_size: int,
                                   1,
                                   1,
                                   torch.float32,
-                                  False,
                                   sliding_window=2 * block_size),
             ),
             KVCacheGroupSpec(
@@ -107,7 +106,6 @@ def make_kv_cache_config_hybrid_model(block_size: int,
                                   1,
                                   1,
                                   torch.float32,
-                                  False,
                                   sliding_window=2 * block_size),
             ),
         ],
@@ -1338,7 +1336,6 @@ def test_eagle_with_sliding_window():
         head_size=1,
         dtype=torch.float32,
         sliding_window=block_size,
-        use_mla=False,
     )
     manager = KVCacheManager(
         KVCacheConfig(

tests/v1/core/test_scheduler.py

@@ -1,5 +1,6 @@
 # SPDX-License-Identifier: Apache-2.0
 # SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+import dataclasses
 from typing import Optional
 from unittest.mock import Mock
 
@@ -1899,4 +1900,53 @@ def test_priority_scheduling_preemption_when_out_of_kv():
     assert output.scheduled_cached_reqs.num_reqs == 1
     assert output.scheduled_cached_reqs.req_ids[0] == request_high.request_id
     assert len(scheduler.waiting) == 1
-    assert len(scheduler.running) == 1
+    assert len(scheduler.running) == 1
+
+
+@pytest.mark.parametrize(
+    ("enable_chunked_prefill", "is_encoder_decoder", "expect_enabled"),
+    [
+        (True, False, True),
+        (False, False, False),
+        # Encoder-decoder models should always have it disabled
+        (False, True, False),
+        (True, True, False),
+    ])
+def test_chunked_prefill_disabled_for_encoder_decoder(
+        enable_chunked_prefill: bool, is_encoder_decoder: bool,
+        expect_enabled: bool) -> None:
+    """Validate that chunked prefill is appropriately disabled for 
+    encoder-decoder models."""
+    scheduler_config = SchedulerConfig(
+        enable_chunked_prefill=enable_chunked_prefill,
+        is_encoder_decoder=is_encoder_decoder,
+    )
+
+    # `is_encoder_decoder` should only be used during construction
+    # of the config, and otherwise stored in the model config.
+    assert "is_encoder_decoder" not in vars(scheduler_config)
+    assert "is_encoder_decoder" not in [
+        f.name for f in dataclasses.fields(scheduler_config)
+    ]
+    _validate_chunked_prefill_settings_for_encoder_decoder(
+        scheduler_config, is_encoder_decoder, expect_enabled)
+
+    # Ensure it is retained in VllmConfig, even after its post-init.
+    vllm_config = VllmConfig(scheduler_config=scheduler_config)
+    _validate_chunked_prefill_settings_for_encoder_decoder(
+        vllm_config.scheduler_config, is_encoder_decoder, expect_enabled)
+
+
+def _validate_chunked_prefill_settings_for_encoder_decoder(
+        scheduler_config: SchedulerConfig, is_encoder_decoder: bool,
+        expect_enabled: bool) -> None:
+    """Validate chunked prefill settings in the scheduler config for 
+    encoder-decoder models."""
+    assert scheduler_config.chunked_prefill_enabled is expect_enabled
+    assert scheduler_config.enable_chunked_prefill is expect_enabled
+    if is_encoder_decoder:
+        # Encoder-decoder models should automatically disable chunked multimodal
+        # inputs as well
+        assert scheduler_config.disable_chunked_mm_input is not expect_enabled
+    if is_encoder_decoder and not expect_enabled:
+        assert scheduler_config.long_prefill_token_threshold == 0

tests/v1/core/test_single_type_kv_cache_manager.py

@@ -35,7 +35,6 @@ def test_chunked_local_attention_possible_cached_prefix():
         head_size=1,
         dtype=torch.float32,
         attention_chunk_size=4,
-        use_mla=False,
     )
 
     block_pool = BlockPool(num_gpu_blocks=100, enable_caching=True)
@@ -100,7 +99,6 @@ def test_sliding_window_possible_cached_prefix():
         head_size=1,
         dtype=torch.float32,
         sliding_window=4,
-        use_mla=False,
     )
 
     block_pool = BlockPool(num_gpu_blocks=100, enable_caching=True)
@@ -165,7 +163,6 @@ def test_chunked_local_attention_remove_skipped_blocks():
         head_size=1,
         dtype=torch.float32,
         attention_chunk_size=4,
-        use_mla=False,
     )
 
     block_pool = BlockPool(num_gpu_blocks=2000, enable_caching=True)
@@ -217,7 +214,6 @@ def test_sliding_window_remove_skipped_blocks():
         head_size=1,
         dtype=torch.float32,
         sliding_window=4,
-        use_mla=False,
     )
 
     block_pool = BlockPool(num_gpu_blocks=2000, enable_caching=True)
@@ -285,7 +281,6 @@ def test_get_num_blocks_to_allocate():
         head_size=1,
         dtype=torch.float32,
         sliding_window=4,  # Placeholder value, not related to test result
-        use_mla=False,
     )
 
     block_pool = BlockPool(num_gpu_blocks=100, enable_caching=True)
@@ -308,7 +303,6 @@ def test_chunked_local_attention_get_num_blocks_to_allocate():
         head_size=1,
         dtype=torch.float32,
         attention_chunk_size=4,  # Placeholder value, not related to test result
-        use_mla=False,
     )
 
     block_pool = BlockPool(num_gpu_blocks=100, enable_caching=True)

tests/v1/cudagraph/test_cudagraph_dispatch.py

@@ -45,39 +45,22 @@ def _create_vllm_config(compilation_config: CompilationConfig,
 class TestCudagraphDispatcher:
 
     @pytest.mark.parametrize(
-        "params",
+        "case_id,cudagraph_mode_str,compilation_level",
         [
             # Test case 0: Full CG for mixed batches, no separate routine
-            {
-                "case_id": 0,
-                "cudagraph_mode": "FULL",
-                "compilation_level": CompilationLevel.NO_COMPILATION,
-            },
+            (0, "FULL", CompilationLevel.NO_COMPILATION),
             # Test case 1: Full CG for uniform batches, piecewise for mixed
-            {
-                "case_id": 1,
-                "cudagraph_mode": "FULL_AND_PIECEWISE",
-                "compilation_level": CompilationLevel.PIECEWISE,
-            },
+            (1, "FULL_AND_PIECEWISE", CompilationLevel.NO_COMPILATION),
             # Test case 2: Full CG for uniform batches, no CG for mixed
-            {
-                "case_id": 2,
-                "cudagraph_mode": "FULL_DECODE_ONLY",
-                "compilation_level": CompilationLevel.NO_COMPILATION,
-            },
+            (2, "FULL_DECODE_ONLY", CompilationLevel.NO_COMPILATION),
             # Test case 3: Piecewise for all
-            {
-                "case_id": 3,
-                "cudagraph_mode": "PIECEWISE",
-                "compilation_level": CompilationLevel.PIECEWISE,
-            },
+            (3, "PIECEWISE", CompilationLevel.PIECEWISE),
         ])
-    def test_dispatcher(self, params):
+    def test_dispatcher(self, cudagraph_mode_str, compilation_level):
         # Setup dispatcher
-        comp_config = CompilationConfig(
-            cudagraph_mode=params["cudagraph_mode"],
-            level=params["compilation_level"],
-            cudagraph_capture_sizes=[1, 8])
+        comp_config = CompilationConfig(cudagraph_mode=cudagraph_mode_str,
+                                        level=compilation_level,
+                                        cudagraph_capture_sizes=[1, 8])
 
         config = _create_vllm_config(comp_config, max_num_seqs=8)
         dispatcher = CudagraphDispatcher(config)
@@ -86,11 +69,11 @@ class TestCudagraphDispatcher:
             uniform_decode_query_len=1)
 
         # Verify the key is initialized correctly
-        if params["cudagraph_mode"] in ["FULL_AND_PIECEWISE", "PIECEWISE"]:
+        if cudagraph_mode_str in ["FULL_AND_PIECEWISE", "PIECEWISE"]:
             assert len(dispatcher.cudagraph_keys[CUDAGraphMode.PIECEWISE]) == 2
         else:
             assert len(dispatcher.cudagraph_keys[CUDAGraphMode.PIECEWISE]) == 0
-        if params["cudagraph_mode"] not in ["NONE", "PIECEWISE"]:
+        if cudagraph_mode_str not in ["NONE", "PIECEWISE"]:
             assert len(dispatcher.cudagraph_keys[CUDAGraphMode.FULL]) == 2
         else:
             assert len(dispatcher.cudagraph_keys[CUDAGraphMode.FULL]) == 0
@@ -99,10 +82,10 @@ class TestCudagraphDispatcher:
         # 1. non-uniform batch, size in cudagraph size list
         desc_full_exact = BatchDescriptor(num_tokens=8, uniform_decode=False)
         rt_mode, key = dispatcher.dispatch(desc_full_exact)
-        if params["cudagraph_mode"] == "FULL":
+        if cudagraph_mode_str == "FULL":
             assert rt_mode == CUDAGraphMode.FULL
             assert key == desc_full_exact
-        elif params["cudagraph_mode"] in ["FULL_AND_PIECEWISE", "PIECEWISE"]:
+        elif cudagraph_mode_str in ["FULL_AND_PIECEWISE", "PIECEWISE"]:
             assert rt_mode == CUDAGraphMode.PIECEWISE
             assert key == desc_full_exact
         else:
@@ -111,15 +94,13 @@ class TestCudagraphDispatcher:
         # 2. uniform decode batch, size in cudagraph size list
         desc_uniform_exact = BatchDescriptor(num_tokens=8, uniform_decode=True)
         rt_mode, key = dispatcher.dispatch(desc_uniform_exact)
-        if params["cudagraph_mode"] == "FULL":
+        if cudagraph_mode_str == "FULL":
             assert rt_mode == CUDAGraphMode.FULL
             assert key == desc_uniform_exact.non_uniform
-        elif params["cudagraph_mode"] in [
-                "FULL_DECODE_ONLY", "FULL_AND_PIECEWISE"
-        ]:
+        elif cudagraph_mode_str in ["FULL_DECODE_ONLY", "FULL_AND_PIECEWISE"]:
             assert rt_mode == CUDAGraphMode.FULL
             assert key == desc_uniform_exact
-        elif params["cudagraph_mode"] == "PIECEWISE":
+        elif cudagraph_mode_str == "PIECEWISE":
             assert rt_mode == CUDAGraphMode.PIECEWISE
             assert key == desc_uniform_exact.non_uniform
         else:
@@ -131,6 +112,16 @@ class TestCudagraphDispatcher:
         assert rt_mode == CUDAGraphMode.NONE
         assert key is None
 
+        # 4. Cascade attention should have a fall back mode
+        desc_full_exact = BatchDescriptor(num_tokens=8, uniform_decode=False)
+        rt_mode, key = dispatcher.dispatch(desc_full_exact,
+                                           use_cascade_attn=True)
+        if "PIECEWISE" in cudagraph_mode_str:  # string contains check
+            assert rt_mode == CUDAGraphMode.PIECEWISE
+            assert key == desc_full_exact.non_uniform
+        else:
+            assert rt_mode == CUDAGraphMode.NONE
+
 
 @pytest.mark.skipif(not current_platform.is_cuda(), reason="Skip if not cuda")
 class TestCUDAGraphWrapper:

tests/v1/cudagraph/test_cudagraph_mode.py

@@ -4,12 +4,11 @@ import contextlib
 import os
 import weakref
 from contextlib import ExitStack
-from dataclasses import dataclass
-from typing import Optional
 
 import pytest
 
 from tests.utils import wait_for_gpu_memory_to_clear
+from tests.v1.attention.utils import full_cg_backend_configs as backend_configs
 from vllm import LLM
 from vllm.config import CompilationConfig
 from vllm.platforms import current_platform
@@ -34,74 +33,6 @@ def temporary_environ(env_vars):
                 os.environ[k] = v
 
 
-@dataclass
-class BackendConfig:
-    name: str
-    env_vars: dict
-    comp_config: dict
-    specific_gpu_arch: Optional[tuple] = None
-
-
-# Define all backend configurations of full cudagraph to be tested
-backend_configs = {
-    # FA3 on Hopper
-    "FA3":
-    BackendConfig(name="FA3",
-                  env_vars={
-                      "VLLM_FLASH_ATTN_VERSION": "3",
-                      "VLLM_FLASH_ATTN_MAX_NUM_SPLITS_FOR_CUDA_GRAPH": "16",
-                  },
-                  comp_config={
-                      "cudagraph_mode": "FULL",
-                  },
-                  specific_gpu_arch=(9, 0)),
-    # FlashMLA on Hopper
-    "FlashMLA":
-    BackendConfig(name="FlashMLA",
-                  env_vars={
-                      "VLLM_ATTENTION_BACKEND": "FLASHMLA",
-                  },
-                  comp_config={
-                      "cudagraph_mode": "FULL_AND_PIECEWISE",
-                  },
-                  specific_gpu_arch=(9, 0)),
-    # FlashAttention MLA on Hopper
-    "FlashAttentionMLA":
-    BackendConfig(name="FlashAttentionMLA",
-                  env_vars={
-                      "VLLM_ATTENTION_BACKEND": "FLASH_ATTN_MLA",
-                      "VLLM_FLASH_ATTN_MAX_NUM_SPLITS_FOR_CUDA_GRAPH": "16",
-                  },
-                  comp_config={
-                      "cudagraph_mode": "FULL_DECODE_ONLY",
-                  },
-                  specific_gpu_arch=(9, 0)),
-    # FA2
-    "FA2":
-    BackendConfig(name="FA2",
-                  env_vars={
-                      "VLLM_FLASH_ATTN_VERSION": "2",
-                      "VLLM_FLASH_ATTN_MAX_NUM_SPLITS_FOR_CUDA_GRAPH": "16",
-                  },
-                  comp_config={
-                      "cudagraph_mode": "FULL_AND_PIECEWISE",
-                  }),
-    # Triton Attention
-    "TritonAttn":
-    BackendConfig(name="TritonAttn",
-                  env_vars={"VLLM_ATTENTION_BACKEND": "TRITON_ATTN"},
-                  comp_config={
-                      "cudagraph_mode": "FULL_AND_PIECEWISE",
-                  }),
-    # FlashInfer
-    "FlashInfer":
-    BackendConfig(name="FlashInfer",
-                  env_vars={"VLLM_ATTENTION_BACKEND": "FLASHINFER"},
-                  comp_config={
-                      "cudagraph_mode": "FULL_AND_PIECEWISE",
-                  }),
-}
-
 # test attention backend and cudagraph_mode combo
 # (backend_name, cudagraph_mode, supported)
 combo_cases_1 = [
@@ -114,9 +45,10 @@ combo_cases_1 = [
 ]
 
 
-@pytest.mark.parametrize("combo_case", combo_cases_1)
-def test_backend_and_cudagraph_mode_combo(combo_case):
-    backend_name, cudagraph_mode, supported = combo_case
+@pytest.mark.parametrize("backend_name, cudagraph_mode, supported",
+                         combo_cases_1)
+def test_backend_and_cudagraph_mode_combo(backend_name, cudagraph_mode,
+                                          supported):
     if backend_name == "FlashInfer":
         try:
             import flashinfer  # noqa: F401
@@ -142,7 +74,7 @@ def test_backend_and_cudagraph_mode_combo(combo_case):
                   compilation_config=CompilationConfig(
                       level=3, cudagraph_mode=cudagraph_mode))
         llm.generate(["Hello, my name is"] * 10)
-
+    # when above code raises, `llm` may be undefined, so we need to catch that
     try:
         llm = weakref.proxy(llm)
         del llm
@@ -173,7 +105,8 @@ combo_cases_2 = [
 ]
 
 
-@pytest.mark.parametrize("combo_case", combo_cases_2)
+@pytest.mark.parametrize("backend_name,cudagraph_mode,compilation_level,"\
+                         "supported", combo_cases_2)
 def test_cudagraph_compilation_combo(combo_case):
     backend_name, cudagraph_mode, compilation_level, supported\
         = combo_case
@@ -192,6 +125,7 @@ def test_cudagraph_compilation_combo(combo_case):
                   compilation_config=CompilationConfig(
                       level=compilation_level, cudagraph_mode=cudagraph_mode))
         llm.generate(["Hello, my name is"] * 10)
+    # when above code raises, `llm` may be undefined, so we need to catch that
     try:
         llm = weakref.proxy(llm)
         del llm

tests/v1/distributed/test_hybrid_lb_dp.py

@@ -12,7 +12,7 @@ import pytest_asyncio
 import requests
 
 from tests.utils import RemoteOpenAIServer
-from tests.v1.test_utils import check_request_balancing
+from tests.v1.utils import check_request_balancing
 from vllm.platforms import current_platform
 
 MODEL_NAME = "ibm-research/PowerMoE-3b"

tests/v1/distributed/test_internal_lb_dp.py

@@ -13,7 +13,7 @@ import pytest_asyncio
 import requests
 
 from tests.utils import RemoteOpenAIServer
-from tests.v1.test_utils import check_request_balancing
+from tests.v1.utils import check_request_balancing
 from vllm.platforms import current_platform
 
 MODEL_NAME = "ibm-research/PowerMoE-3b"

tests/v1/e2e/test_spec_decode.py

@@ -8,13 +8,15 @@ from typing import Any, Union
 import pytest
 import torch
 
-from tests.utils import get_attn_backend_list_based_on_platform
+from tests.utils import get_attn_backend_list_based_on_platform, large_gpu_mark
 from vllm import LLM, SamplingParams
 from vllm.assets.base import VLLM_S3_BUCKET_URL
 from vllm.assets.image import VLM_IMAGES_DIR
 from vllm.distributed import cleanup_dist_env_and_memory
 from vllm.platforms import current_platform
 
+MTP_SIMILARITY_RATE = 0.8
+
 
 def get_test_prompts(mm_enabled: bool):
     prompt_types = ["repeat", "sentence"]
@@ -86,69 +88,71 @@ def test_ngram_correctness(
     Compare the outputs of an original LLM and a speculative LLM
     should be the same when using ngram speculative decoding.
     '''
-    with monkeypatch.context() as m:
-        m.setenv("VLLM_USE_V1", "1")
-        test_prompts = get_test_prompts(mm_enabled=False)
+    test_prompts = get_test_prompts(mm_enabled=False)
 
-        ref_llm = LLM(model=model_name, max_model_len=1024)
-        ref_outputs = ref_llm.chat(test_prompts, sampling_config)
-        del ref_llm
-        torch.cuda.empty_cache()
-        cleanup_dist_env_and_memory()
+    ref_llm = LLM(model=model_name, max_model_len=1024)
+    ref_outputs = ref_llm.chat(test_prompts, sampling_config)
+    del ref_llm
+    torch.cuda.empty_cache()
+    cleanup_dist_env_and_memory()
 
-        spec_llm = LLM(
-            model=model_name,
-            speculative_config={
-                "method": "ngram",
-                "prompt_lookup_max": 5,
-                "prompt_lookup_min": 3,
-                "num_speculative_tokens": 3,
-            },
-            max_model_len=1024,
-        )
-        spec_outputs = spec_llm.chat(test_prompts, sampling_config)
-        matches = 0
-        misses = 0
-        for ref_output, spec_output in zip(ref_outputs, spec_outputs):
-            if ref_output.outputs[0].text == spec_output.outputs[0].text:
-                matches += 1
-            else:
-                misses += 1
-                print(f"ref_output: {ref_output.outputs[0].text}")
-                print(f"spec_output: {spec_output.outputs[0].text}")
+    spec_llm = LLM(
+        model=model_name,
+        speculative_config={
+            "method": "ngram",
+            "prompt_lookup_max": 5,
+            "prompt_lookup_min": 3,
+            "num_speculative_tokens": 3,
+        },
+        max_model_len=1024,
+    )
+    spec_outputs = spec_llm.chat(test_prompts, sampling_config)
+    matches = 0
+    misses = 0
+    for ref_output, spec_output in zip(ref_outputs, spec_outputs):
+        if ref_output.outputs[0].text == spec_output.outputs[0].text:
+            matches += 1
+        else:
+            misses += 1
+            print(f"ref_output: {ref_output.outputs[0].text}")
+            print(f"spec_output: {spec_output.outputs[0].text}")
 
-        # Heuristic: expect at least 66% of the prompts to match exactly
-        # Upon failure, inspect the outputs to check for inaccuracy.
-        assert matches >= int(0.66 * len(ref_outputs))
-        del spec_llm
-        torch.cuda.empty_cache()
-        cleanup_dist_env_and_memory()
+    # Heuristic: expect at least 66% of the prompts to match exactly
+    # Upon failure, inspect the outputs to check for inaccuracy.
+    assert matches >= int(0.66 * len(ref_outputs))
+    del spec_llm
+    torch.cuda.empty_cache()
+    cleanup_dist_env_and_memory()
 
 
-@pytest.mark.parametrize(["model_setup", "mm_enabled"], [
-    (("eagle3", "Qwen/Qwen3-8B", "AngelSlim/Qwen3-8B_eagle3", 1), False),
-    (("eagle", "meta-llama/Llama-3.1-8B-Instruct",
-      "yuhuili/EAGLE-LLaMA3.1-Instruct-8B", 1), False),
-    (("eagle3", "meta-llama/Llama-3.1-8B-Instruct",
-      "yuhuili/EAGLE3-LLaMA3.1-Instruct-8B", 1), False),
-    pytest.param(
-        ("eagle", "meta-llama/Llama-4-Scout-17B-16E-Instruct",
-         "morgendave/EAGLE-Llama-4-Scout-17B-16E-Instruct", 4),
-        False,
-        marks=pytest.mark.skip(reason="Skipping due to CI OOM issues")),
-    pytest.param(
-        ("eagle", "meta-llama/Llama-4-Scout-17B-16E-Instruct",
-         "morgendave/EAGLE-Llama-4-Scout-17B-16E-Instruct", 4),
-        True,
-        marks=pytest.mark.skip(reason="Skipping due to CI OOM issues")),
-    (("eagle", "eagle618/deepseek-v3-random",
-      "eagle618/eagle-deepseek-v3-random", 1), False),
-],
-                         ids=[
-                             "qwen3_eagle3", "llama3_eagle", "llama3_eagle3",
-                             "llama4_eagle", "llama4_eagle_mm",
-                             "deepseek_eagle"
-                         ])
+@pytest.mark.parametrize(
+    ["model_setup", "mm_enabled"],
+    [
+        (("eagle3", "Qwen/Qwen3-8B", "AngelSlim/Qwen3-8B_eagle3", 1), False),
+        pytest.param(("eagle3", "Qwen/Qwen2.5-VL-7B-Instruct",
+                      "Rayzl/qwen2.5-vl-7b-eagle3-sgl", 1),
+                     False,
+                     marks=pytest.mark.skip(reason="Skipping due to its " \
+                               "head_dim not being a a multiple of 32")),
+        (("eagle", "meta-llama/Llama-3.1-8B-Instruct",
+          "yuhuili/EAGLE-LLaMA3.1-Instruct-8B", 1), False),
+        (("eagle3", "meta-llama/Llama-3.1-8B-Instruct",
+          "yuhuili/EAGLE3-LLaMA3.1-Instruct-8B", 1), False),
+        pytest.param(("eagle", "meta-llama/Llama-4-Scout-17B-16E-Instruct",
+                      "morgendave/EAGLE-Llama-4-Scout-17B-16E-Instruct", 4),
+                     False,
+                     marks=large_gpu_mark(min_gb=80)),  # works on 4x H100
+        pytest.param(("eagle", "meta-llama/Llama-4-Scout-17B-16E-Instruct",
+                      "morgendave/EAGLE-Llama-4-Scout-17B-16E-Instruct", 4),
+                     True,
+                     marks=large_gpu_mark(min_gb=80)),  # works on 4x H100
+        (("eagle", "eagle618/deepseek-v3-random",
+          "eagle618/eagle-deepseek-v3-random", 1), False),
+    ],
+    ids=[
+        "qwen3_eagle3", "qwen2_5_vl_eagle3", "llama3_eagle", "llama3_eagle3",
+        "llama4_eagle", "llama4_eagle_mm", "deepseek_eagle"
+    ])
 @pytest.mark.parametrize("attn_backend",
                          get_attn_backend_list_based_on_platform())
 def test_eagle_correctness(
@@ -172,9 +176,14 @@ def test_eagle_correctness(
     model_setup: (method, model_name, eagle_model_name, tp_size)
     '''
     with monkeypatch.context() as m:
-        m.setenv("VLLM_USE_V1", "1")
-        m.setenv("VLLM_MLA_DISABLE", "1")
-        m.setenv("VLLM_ATTENTION_BACKEND", attn_backend)
+        if "Llama-4-Scout" in model_setup[1] and attn_backend == "FLASH_ATTN":
+            # Scout requires default backend selection
+            # because vision encoder has head_dim 88 being incompatible
+            #  with FLASH_ATTN and needs to fall back to Flex Attn
+            pass
+        else:
+            m.setenv("VLLM_MLA_DISABLE", "1")
+            m.setenv("VLLM_ATTENTION_BACKEND", attn_backend)
 
         if (attn_backend == "TRITON_ATTN" and not current_platform.is_rocm()):
             pytest.skip("TRITON_ATTN does not support "
@@ -222,3 +231,66 @@ def test_eagle_correctness(
         del spec_llm
         torch.cuda.empty_cache()
         cleanup_dist_env_and_memory()
+
+
+@pytest.mark.parametrize(["model_setup", "mm_enabled"], [
+    (("mtp", "XiaomiMiMo/MiMo-7B-Base", 1), False),
+    (("mtp", "ZixiQi/DeepSeek-V3-4layers-MTP-FP8", 1), False),
+],
+                         ids=["mimo", "deepseek"])
+def test_mtp_correctness(
+    monkeypatch: pytest.MonkeyPatch,
+    sampling_config: SamplingParams,
+    model_setup: tuple[str, str, int],
+    mm_enabled: bool,
+):
+    # Generate test prompts inside the function instead of using fixture
+    test_prompts = get_test_prompts(mm_enabled)
+    '''
+    Compare the outputs of a original LLM and a speculative LLM
+    should be the same when using MTP speculative decoding.
+    model_setup: (method, model_name, tp_size)
+    '''
+    with monkeypatch.context() as m:
+        m.setenv("VLLM_USE_V1", "1")
+        m.setenv("VLLM_MLA_DISABLE", "1")
+
+        method, model_name, tp_size = model_setup
+
+        ref_llm = LLM(model=model_name,
+                      max_model_len=2048,
+                      tensor_parallel_size=tp_size,
+                      trust_remote_code=True)
+        ref_outputs = ref_llm.chat(test_prompts, sampling_config)
+        del ref_llm
+        torch.cuda.empty_cache()
+        cleanup_dist_env_and_memory()
+
+        spec_llm = LLM(
+            model=model_name,
+            trust_remote_code=True,
+            tensor_parallel_size=tp_size,
+            speculative_config={
+                "method": method,
+                "num_speculative_tokens": 1,
+                "max_model_len": 2048,
+            },
+            max_model_len=2048,
+        )
+        spec_outputs = spec_llm.chat(test_prompts, sampling_config)
+        matches = 0
+        misses = 0
+        for ref_output, spec_output in zip(ref_outputs, spec_outputs):
+            if ref_output.outputs[0].text == spec_output.outputs[0].text:
+                matches += 1
+            else:
+                misses += 1
+                print(f"ref_output: {ref_output.outputs[0].text}")
+                print(f"spec_output: {spec_output.outputs[0].text}")
+
+        # Heuristic: expect at least 80% of the prompts to match exactly
+        # Upon failure, inspect the outputs to check for inaccuracy.
+        assert matches > int(MTP_SIMILARITY_RATE * len(ref_outputs))
+        del spec_llm
+        torch.cuda.empty_cache()
+        cleanup_dist_env_and_memory()

tests/v1/engine/test_engine_core_client.py

@@ -836,8 +836,7 @@ def test_engine_core_proc_instantiation_cuda_empty(
         mock_spec = FullAttentionSpec(block_size=16,
                                       num_kv_heads=1,
                                       head_size=64,
-                                      dtype=torch.float16,
-                                      use_mla=False)
+                                      dtype=torch.float16)
 
         mock_executor.get_kv_cache_specs.return_value = [{
             "default": mock_spec

tests/v1/entrypoints/openai/test_multi_api_servers.py

@@ -8,7 +8,7 @@ import pytest
 import pytest_asyncio
 
 from tests.utils import RemoteOpenAIServer
-from tests.v1.test_utils import check_request_balancing
+from tests.v1.utils import check_request_balancing
 
 MODEL_NAME = "ibm-research/PowerMoE-3b"
 

tests/v1/generation/test_batch_invariance.py

@@ -0,0 +1,290 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+import contextlib
+import os
+import random
+import string
+
+import pytest
+import torch
+
+from vllm import LLM, SamplingParams
+
+
+def _random_prompt(min_words: int = 1024, max_words: int = 1024 * 2) -> str:
+    # Lightweight random prompt generator to vary prompt lengths and content.
+    vocab = [
+        "alpha",
+        "bravo",
+        "charlie",
+        "delta",
+        "echo",
+        "foxtrot",
+        "golf",
+        "hotel",
+        "india",
+        "juliet",
+        "kilo",
+        "lima",
+        "mike",
+        "november",
+        "oscar",
+        "papa",
+        "quebec",
+        "romeo",
+        "sierra",
+        "tango",
+        "uniform",
+        "victor",
+        "whiskey",
+        "xray",
+        "yankee",
+        "zulu",
+    ]
+    n = random.randint(min_words, max_words)
+    words = random.choices(vocab, k=n)
+
+    # Add some noise and punctuation variability
+    if random.random() < 0.5:
+        words[0] = words[0].capitalize()
+    if random.random() < 0.2:
+        words.append("".join(random.choices(string.ascii_lowercase, k=5)))
+    punct = random.choice([".", "?", "!", "...", ""])
+    return " ".join(words) + punct
+
+
+@pytest.mark.timeout(1000)
+def test_v1_generation_is_deterministic_across_batch_sizes_with_needle():
+    """
+    Ensures that the same request (the 'needle' prompt) yields identical output
+    whether run alone (bs=1) or mixed into a larger batch (e.g., bs=64),
+    using the high-level v1 LLM() API only (no manual batching).
+
+    Strategy:
+    - Create two LLM engines with identical config except max_num_seqs: 1 vs N.
+    - Compute a baseline output for the needle prompt with the bs=1 engine.
+    - For many trials, generate a batch (size N) where the needle appears at a
+      random position among random filler prompts using the bs=N engine.
+    - Track how many trials match vs mismatch, and report totals at the end.
+      The test fails if any mismatches occur, but we still dump pass/fail
+      counts.
+
+    Notes:
+    - Use seeded stochastic sampling with a fixed seed to test determinism.
+    - Outputs are intentionally longer and sampled at higher temperature/top_p
+      to produce a more random-sounding phrase, yet remain deterministic by 
+      seed.
+    - Keep max_tokens and max_model_len bounded for speed and memory use.
+    """
+    random.seed(12345)
+
+    # Allow overrides from environment (useful for CI tuning)
+    # "facebook/opt-125m" is too small, doesn't reliably test determinism
+    model = os.getenv("VLLM_TEST_MODEL", "Qwen/Qwen3-1.7B")
+    num_trials = int(os.getenv("VLLM_NEEDLE_TRIALS", "5"))
+    batch_size = int(os.getenv("VLLM_NEEDLE_BATCH_SIZE", "64"))
+    assert batch_size >= 2, "Batch size should be >= 2 to mix needle."
+
+    # Keep GPU memory usage low to avoid startup allocation failures.
+    gpu_mem_util = float(os.getenv("VLLM_GPU_MEMORY_UTILIZATION", "0.3"))
+    max_model_len = int(os.getenv("VLLM_MAX_MODEL_LEN", "4096"))
+    swap_space_gb = int(os.getenv("VLLM_SWAP_SPACE_GB", "4"))
+
+    # Sampling parameters: longer outputs with a more random-sounding
+    # continuation,but still deterministic due to fixed seed.
+    temperature = float(os.getenv("VLLM_NEEDLE_TEMPERATURE", "0.0"))
+    top_p = float(os.getenv("VLLM_NEEDLE_TOP_P", "0.95"))
+    max_tokens = int(os.getenv("VLLM_NEEDLE_MAX_TOKENS", "128"))
+
+    sampling = SamplingParams(
+        temperature=temperature,
+        top_p=top_p,
+        max_tokens=max_tokens,
+        seed=20240919,
+    )
+
+    needle_prompt = ("There once was a ")
+
+    llm_bs1 = None
+    llm_bsN = None
+    try:
+        # Engine with bs=1 behavior
+        llm_bs1 = LLM_with_max_seqs(
+            model=model,
+            max_num_seqs=1,
+            gpu_memory_utilization=gpu_mem_util,
+            max_model_len=max_model_len,
+            swap_space=swap_space_gb,
+        )
+
+        # Baseline generation for the needle prompt alone.
+        baseline_out = llm_bs1.generate([needle_prompt], sampling)
+        assert len(baseline_out) == 1
+        assert len(baseline_out[0].outputs) >= 1
+        baseline_text = baseline_out[0].outputs[0].text
+
+        # Engine with larger batch limit (e.g., 64)
+        llm_bsN = LLM_with_max_seqs(
+            model=model,
+            max_num_seqs=batch_size,
+            gpu_memory_utilization=gpu_mem_util,
+            max_model_len=max_model_len,
+            swap_space=swap_space_gb,
+        )
+
+        mismatches = 0
+
+        for trial in range(num_trials):
+            # Create a batch of size `batch_size` and insert the needle at
+            # a random index
+            prompts: list[str] = []
+            needle_pos = random.randint(0, batch_size - 1)
+            for i in range(batch_size):
+                if i == needle_pos:
+                    prompts.append(needle_prompt)
+                else:
+                    prompts.append(_random_prompt())
+
+            # Generate with the larger-batch engine
+            outputs = llm_bsN.generate(prompts, sampling)
+            # Find the needle output by position
+            needle_output = outputs[needle_pos]
+            assert needle_output.prompt == needle_prompt
+            assert len(needle_output.outputs) >= 1
+            text = needle_output.outputs[0].text
+
+            if text != baseline_text:
+                mismatches += 1
+
+        passes = num_trials - mismatches
+        # Dump how many passed vs failed
+        print(f"[determinism] total={num_trials}, passed={passes}, "
+              f"failed={mismatches}, batch_size={batch_size}")
+
+        if mismatches > 0:
+            pytest.fail(
+                f"Nondeterministic outputs detected: {mismatches} failed out "
+                f"of {num_trials} trials (batch_size={batch_size}).")
+
+    finally:
+        # Ensure engines are shutdown to free GPU/VRAM across test sessions
+        if llm_bs1 is not None:
+            with contextlib.suppress(Exception):
+                llm_bs1.shutdown()
+        if llm_bsN is not None:
+            with contextlib.suppress(Exception):
+                llm_bsN.shutdown()
+
+
+def _extract_step_logprobs(request_output):
+    if getattr(request_output, "outputs", None):
+        inner = request_output.outputs[0]
+        if hasattr(inner, "logprobs") and inner.logprobs is not None:
+            t = torch.tensor(
+                [
+                    inner.logprobs[i][tid].logprob
+                    for i, tid in enumerate(inner.token_ids)
+                ],
+                dtype=torch.float32,
+            )
+            return t
+
+    return None
+
+
+@pytest.mark.skipif(
+    not torch.cuda.is_available(),
+    reason="Requires CUDA to match production inference path.",
+)
+def test_logprobs_bitwise_batch_invariance_bs1_vs_bs2():
+
+    #model_name = os.getenv("VLLM_TEST_MODEL", "facebook/opt-125m")
+    model_name = os.getenv("VLLM_TEST_MODEL", "Qwen/Qwen3-1.7B")
+    tp_size = int(os.getenv("VLLM_TEST_TP_SIZE", "1"))
+
+    # Force float32 to avoid precision-induced differences.
+    llm = LLM(
+        model=model_name,
+        tensor_parallel_size=tp_size,
+        enforce_eager=True,  # helps reduce nondeterminism from some backends
+    )
+
+    prompts = [
+        "The capital of France is",
+        "The capital of Germany is",
+    ]
+
+    sp = SamplingParams(
+        temperature=0.0,
+        top_p=1.0,
+        max_tokens=8,
+        # Seed shouldn't matter at temperature=0, but keeping it stable anyway.
+        seed=1234,
+        logprobs=5,
+    )
+
+    # BS=1: run prompts individually and collect logprobs per step.
+    bs1_logprobs_per_prompt = []
+    for p in prompts:
+        outs = llm.generate([p], sp, use_tqdm=False)
+        assert len(outs) == 1
+        step_logprobs = _extract_step_logprobs(outs[0])
+        if step_logprobs is None:
+            pytest.skip("Logits are not available on RequestOutput; "
+                        "enable logprobs return to run this test.")
+        bs1_logprobs_per_prompt.append(step_logprobs)
+
+    # BS=2: run prompts in a batch and collect logprobs per step for each
+    # prompt.
+    outs_batched = llm.generate(prompts, sp, use_tqdm=False)
+    assert len(outs_batched) == len(prompts)
+    bs2_logprobs_per_prompt = []
+    for o in outs_batched:
+        step_logprobs = _extract_step_logprobs(o)
+        if step_logprobs is None:
+            pytest.skip("Logits are not available on RequestOutput; "
+                        "enable logprobs return to run this test.")
+        bs2_logprobs_per_prompt.append(step_logprobs)
+
+    # Compare step-by-step logprobs for each prompt between BS=1 and BS=2 runs.
+    for i, (logprobs_bs1, logprobs_bs2) in enumerate(
+            zip(bs1_logprobs_per_prompt, bs2_logprobs_per_prompt)):
+        assert len(logprobs_bs1) == len(logprobs_bs2), (
+            f"Different number of generation steps for prompt index {i}: "
+            f"{len(logprobs_bs1)} (BS=1) vs {len(logprobs_bs2)} (BS=2)")
+        for t, (a, b) in enumerate(zip(logprobs_bs1, logprobs_bs2)):
+            assert a.shape == b.shape, (
+                f"Logits shape mismatch at prompt {i}, step {t}: "
+                f"{a.shape} vs {b.shape}")
+            # Bitwise exact equality.
+            assert torch.equal(
+                a, b), (f"Bitwise logprobs mismatch at prompt {i}, step {t} "
+                        f"(dtype={a.dtype}, shape={a.shape}).")
+
+
+def LLM_with_max_seqs(
+    model: str,
+    max_num_seqs: int,
+    gpu_memory_utilization: float,
+    max_model_len: int,
+    swap_space: int,
+) -> LLM:
+    """
+    Helper to construct an LLM with a specific max_num_seqs (batch-size limit)
+    using the high-level v1 LLM API, while constraining memory usage.
+    """
+    return LLM(
+        model=model,
+        max_num_seqs=max_num_seqs,
+        # Constrain GPU memory pool so test can run even on busy GPUs.
+        gpu_memory_utilization=gpu_memory_utilization,
+        # Keep KV cache footprint small while allowing longer outputs.
+        max_model_len=max_model_len,
+        # Allow some CPU offload if needed.
+        swap_space=swap_space,
+        # Keep things lean and CI-friendly.
+        dtype="float16",
+        # Single-GPU by default; override externally if desired.
+        tensor_parallel_size=int(os.getenv("VLLM_TP_SIZE", "1")),
+        trust_remote_code=os.getenv("VLLM_TRUST_REMOTE_CODE", "0") == "1",
+    )

tests/v1/kv_connector/nixl_integration/run_accuracy_test.sh

@@ -1,6 +1,31 @@
 #!/bin/bash
 set -xe
 
+# Parse command line arguments
+KV_BUFFER_DEVICE="cuda"  # Default to cuda
+while [[ $# -gt 0 ]]; do
+  case $1 in
+    --kv_buffer_device)
+      KV_BUFFER_DEVICE="$2"
+      shift 2
+      ;;
+    *)
+      echo "Unknown option $1"
+      echo "Usage: $0 [--kv_buffer_device <cuda|cpu>]"
+      exit 1
+      ;;
+  esac
+done
+
+echo "Running accuracy tests with kv_buffer_device=$KV_BUFFER_DEVICE"
+
+# Build the kv-transfer-config once
+if [[ "$KV_BUFFER_DEVICE" == "cuda" ]]; then
+  KV_CONFIG='{"kv_connector":"NixlConnector","kv_role":"kv_both"}'
+else
+  KV_CONFIG="{\"kv_connector\":\"NixlConnector\",\"kv_role\":\"kv_both\",\"kv_buffer_device\":\"$KV_BUFFER_DEVICE\"}"
+fi
+
 # Models to run
 MODELS=(
     "Qwen/Qwen3-0.6B"
@@ -79,7 +104,7 @@ run_tests_for_model() {
 
     # Calculate port number (base port + instance number)
     PORT=$((8100 + i))
-    # Calculate side channel port. Avoid clash with with TP workers. 
+    # Calculate side channel port. Avoid clash with with TP workers.
     SIDE_CHANNEL_PORT=$((5559 + i))
 
     echo "Starting prefill instance $i on GPU $GPU_ID, port $PORT"
@@ -93,7 +118,7 @@ run_tests_for_model() {
     --enforce-eager \
     --gpu-memory-utilization 0.2 \
     --tensor-parallel-size $PREFILLER_TP_SIZE \
-    --kv-transfer-config '{\"kv_connector\":\"NixlConnector\",\"kv_role\":\"kv_both\"}'"
+    --kv-transfer-config '$KV_CONFIG'"
 
     if [ -n "$model_args" ]; then
     FULL_CMD="$BASE_CMD $model_args"
@@ -128,7 +153,7 @@ run_tests_for_model() {
     --enforce-eager \
     --gpu-memory-utilization 0.2 \
     --tensor-parallel-size $DECODER_TP_SIZE \
-    --kv-transfer-config '{\"kv_connector\":\"NixlConnector\",\"kv_role\":\"kv_both\"}'"
+    --kv-transfer-config '$KV_CONFIG'"
 
     if [ -n "$model_args" ]; then
     FULL_CMD="$BASE_CMD $model_args"

tests/v1/kv_connector/nixl_integration/run_edge_case_test.sh

@@ -1,6 +1,33 @@
 #!/bin/bash
 set -xe
 
+# Parse command line arguments
+KV_BUFFER_DEVICE="cuda"  # Default to cuda
+PREFILL_GPU_ID=4         # Default GPU IDs
+DECODE_GPU_ID=5
+while [[ $# -gt 0 ]]; do
+  case $1 in
+    --kv_buffer_device)
+      KV_BUFFER_DEVICE="$2"
+      shift 2
+      ;;
+    *)
+      echo "Unknown option $1"
+      echo "Usage: $0 [--kv_buffer_device <cuda|cpu>]"
+      exit 1
+      ;;
+  esac
+done
+
+echo "Running edge case tests with kv_buffer_device=$KV_BUFFER_DEVICE (GPUs: $PREFILL_GPU_ID, $DECODE_GPU_ID)"
+
+# Build the kv-transfer-config once
+if [[ "$KV_BUFFER_DEVICE" == "cuda" ]]; then
+  KV_CONFIG='{"kv_connector":"NixlConnector","kv_role":"kv_both"}'
+else
+  KV_CONFIG="{\"kv_connector\":\"NixlConnector\",\"kv_role\":\"kv_both\",\"kv_buffer_device\":\"$KV_BUFFER_DEVICE\"}"
+fi
+
 # Models to run
 MODELS=(
     "Qwen/Qwen3-0.6B"
@@ -50,15 +77,15 @@ run_tests_for_model() {
 
   # Get model-specific arguments
   local model_args=$(get_model_args "$model_name")
-  
+
   # Start prefill instance
   PREFILL_PORT=8001
 
-  BASE_CMD="CUDA_VISIBLE_DEVICES=0 VLLM_NIXL_SIDE_CHANNEL_PORT=5559 vllm serve $model_name \
+  BASE_CMD="CUDA_VISIBLE_DEVICES=$PREFILL_GPU_ID VLLM_NIXL_SIDE_CHANNEL_PORT=5559 vllm serve $model_name \
   --port $PREFILL_PORT \
   --enforce-eager \
   --gpu-memory-utilization 0.2 \
-  --kv-transfer-config '{\"kv_connector\":\"NixlConnector\",\"kv_role\":\"kv_both\"}'"
+  --kv-transfer-config '$KV_CONFIG'"
 
   if [ -n "$model_args" ]; then
   FULL_CMD="$BASE_CMD $model_args"
@@ -72,11 +99,11 @@ run_tests_for_model() {
   DECODE_PORT=8002
 
   # Build the command with or without model-specific args
-  BASE_CMD="CUDA_VISIBLE_DEVICES=1 VLLM_NIXL_SIDE_CHANNEL_PORT=6000 vllm serve $model_name \
+  BASE_CMD="CUDA_VISIBLE_DEVICES=$DECODE_GPU_ID VLLM_NIXL_SIDE_CHANNEL_PORT=6000 vllm serve $model_name \
   --port $DECODE_PORT \
   --enforce-eager \
   --gpu-memory-utilization 0.2 \
-  --kv-transfer-config '{\"kv_connector\":\"NixlConnector\",\"kv_role\":\"kv_both\"}'"
+  --kv-transfer-config '$KV_CONFIG'"
 
   if [ -n "$model_args" ]; then
   FULL_CMD="$BASE_CMD $model_args"

tests/v1/kv_connector/unit/test_nixl_connector.py

@@ -255,8 +255,9 @@ class FakeNixlConnectorWorker(NixlConnectorWorker):
         time.sleep(self._hand_shake_latency)
         # These should've been done in register_kv_caches(), called by
         # gpu_model_runner. Here we just hardcode some dummy values.
-        self.slot_size_bytes = 4096
-        self.block_len = self.slot_size_bytes * self.block_size
+        slot_size_bytes = 4096
+        self.slot_size_per_layer = [slot_size_bytes]
+        self.block_len_per_layer = [slot_size_bytes * self.block_size]
         self.num_blocks = 1
         self.dst_num_blocks[self.engine_id] = self.num_blocks
 
@@ -268,7 +269,7 @@ class FakeNixlConnectorWorker(NixlConnectorWorker):
                 agent_metadata=FakeNixlWrapper.AGENT_METADATA,
                 kv_caches_base_addr=[0],
                 num_blocks=1,
-                block_len=self.block_len,
+                block_lens=self.block_len_per_layer,
                 attn_backend_name=self.backend_name,
                 # `self.kv_cache_layout` is only forced to HND when vllm engine
                 # is started. We mock HND here.
@@ -485,8 +486,8 @@ class TestNixlHandshake:
             worker = connector.connector_worker
 
             # Minimal local registration params used by add_remote_agent
-            worker.slot_size_bytes = 4096
-            worker.block_len = worker.slot_size_bytes * worker.block_size
+            worker.slot_size_per_layer = [4096]
+            worker.block_len_per_layer = [4096 * worker.block_size]
             worker.num_blocks = 1
             worker.dst_num_blocks[worker.engine_id] = worker.num_blocks
 
@@ -498,7 +499,7 @@ class TestNixlHandshake:
                 agent_metadata=FakeNixlWrapper.AGENT_METADATA,
                 kv_caches_base_addr=[0],
                 num_blocks=1,
-                block_len=worker.block_len,
+                block_lens=worker.block_len_per_layer,
                 attn_backend_name=worker.backend_name,
                 kv_cache_layout=mismatched_layout,
             )

tests/v1/spec_decode/test_mtp.py

@@ -0,0 +1,195 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+
+from unittest import mock
+
+import pytest
+import torch
+
+from tests.v1.attention.utils import (BatchSpec, _Backend,
+                                      create_common_attn_metadata,
+                                      create_standard_kv_cache_spec,
+                                      get_attention_backend)
+from vllm.config import (CacheConfig, DeviceConfig, ModelConfig,
+                         ParallelConfig, SchedulerConfig, SpeculativeConfig,
+                         VllmConfig)
+from vllm.config.load import LoadConfig
+from vllm.model_executor.models.llama import LlamaForCausalLM
+from vllm.platforms import current_platform
+from vllm.v1.spec_decode.eagle import EagleProposer
+
+mimo_7b_dir = "XiaomiMiMo/MiMo-7B-Base"
+
+
+def _create_mtp_proposer(num_speculative_tokens: int) -> EagleProposer:
+    """Create an MTP proposer with unified model configuration."""
+    model_config = ModelConfig(model=mimo_7b_dir,
+                               runner="generate",
+                               max_model_len=100,
+                               trust_remote_code=True)
+
+    speculative_config = SpeculativeConfig(
+        target_model_config=model_config,
+        target_parallel_config=ParallelConfig(),
+        model=mimo_7b_dir,
+        method="mtp",
+        num_speculative_tokens=num_speculative_tokens,
+    )
+
+    vllm_config = VllmConfig(
+        model_config=model_config,
+        cache_config=CacheConfig(),
+        speculative_config=speculative_config,
+        device_config=DeviceConfig(device=current_platform.device_type),
+        parallel_config=ParallelConfig(),
+        load_config=LoadConfig(),
+        scheduler_config=SchedulerConfig())
+
+    return EagleProposer(vllm_config=vllm_config,
+                         device=current_platform.device_type)
+
+
+@mock.patch('vllm.v1.spec_decode.eagle.get_pp_group')
+@mock.patch('vllm.v1.spec_decode.eagle.get_layers_from_vllm_config')
+@mock.patch('vllm.v1.spec_decode.eagle.get_model')
+def test_mtp_load_model_unified(mock_get_model, mock_get_layers,
+                                mock_get_pp_group):
+    """Test MTP-specific model loading with unified model approach."""
+
+    # Setup mocks
+    mock_model = mock.MagicMock()
+    mock_model.model.embed_tokens.weight.shape = (131072, 4096)
+    mock_get_model.return_value = mock_model
+
+    target_attn_layers = {"target_attn_1": mock.MagicMock()}
+    all_attn_layers = {**target_attn_layers, "draft_attn_1": mock.MagicMock()}
+    mock_get_layers.side_effect = [target_attn_layers, all_attn_layers]
+
+    mock_pp_group = mock.MagicMock()
+    mock_pp_group.world_size = 1
+    mock_get_pp_group.return_value = mock_pp_group
+
+    # Create target model
+    class _TargetModelStub(LlamaForCausalLM):
+        model: mock.MagicMock
+        lm_head: mock.MagicMock
+
+    target_model = mock.create_autospec(_TargetModelStub, instance=True)
+    target_model.model = mock.MagicMock()
+    target_model.model.embed_tokens.weight.shape = (131072, 4096)
+    target_model.lm_head = mock.MagicMock()
+
+    # Create MTP proposer
+    proposer = _create_mtp_proposer(num_speculative_tokens=4)
+    proposer.load_model(target_model)
+
+    # Verify MTP-specific behavior:
+    # Model is loaded
+    mock_get_model.assert_called_once()
+    # MTP shares lm_head with target model
+    assert proposer.model.lm_head == target_model.lm_head
+    # MTP shares embed_tokens with target model
+    assert proposer.model.model.embed_tokens == target_model.model.embed_tokens
+
+
+@pytest.mark.parametrize("num_speculative_tokens", [1])
+def test_mtp_propose(num_speculative_tokens, monkeypatch):
+    """Test that MTP's forward method returns hidden states directly"""
+
+    device = torch.device(current_platform.device_type)
+    batch_size = 2
+    seq_lens = [5, 3]
+    total_tokens = sum(seq_lens)
+    vocab_size = 100
+
+    proposer = _create_mtp_proposer(num_speculative_tokens)
+    hidden_size = proposer.hidden_size
+
+    # Mock the MTP model to verify it returns hidden states directly
+    model_mock = mock.MagicMock()
+
+    # MTP returns hidden states directly
+    if num_speculative_tokens == 1:
+        model_mock.return_value = torch.zeros(total_tokens,
+                                              hidden_size,
+                                              device=device)
+    else:
+        # Multiple forward passes for multi-token speculation
+        forward_returns = []
+        for i in range(num_speculative_tokens):
+            if i == 0:
+                h_states = torch.zeros(total_tokens,
+                                       hidden_size,
+                                       device=device)
+            else:
+                h_states = torch.zeros(batch_size, hidden_size, device=device)
+            forward_returns.append(h_states)
+        model_mock.side_effect = forward_returns
+
+    # Mock compute_logits
+    def create_deterministic_logits(batch_size, vocab_size, token_offset):
+        logits = torch.full((batch_size, vocab_size), -100.0, device=device)
+        logits[:, token_offset] = 100.0
+        return logits
+
+    if num_speculative_tokens == 1:
+        model_mock.compute_logits.return_value = create_deterministic_logits(
+            batch_size, vocab_size, 42)
+    else:
+        logits_returns = [
+            create_deterministic_logits(batch_size, vocab_size, 42 + i)
+            for i in range(num_speculative_tokens)
+        ]
+        model_mock.compute_logits.side_effect = logits_returns
+
+    proposer.model = model_mock
+    proposer.attn_layer_names = ["layer.0"]
+
+    # Prepare inputs
+    batch_spec = BatchSpec(seq_lens=seq_lens, query_lens=seq_lens)
+    common_attn_metadata = create_common_attn_metadata(batch_spec,
+                                                       block_size=16,
+                                                       device=device)
+
+    target_token_ids = torch.randint(0,
+                                     vocab_size, (total_tokens, ),
+                                     device=device)
+    target_positions = torch.cat([
+        torch.arange(seq_lens[0], device=device),
+        torch.arange(seq_lens[1], device=device)
+    ])
+    target_hidden_states = torch.randn(total_tokens,
+                                       hidden_size,
+                                       device=device)
+    next_token_ids = torch.randint(0,
+                                   vocab_size, (batch_size, ),
+                                   dtype=torch.int32,
+                                   device=device)
+    sampling_metadata = mock.MagicMock()
+
+    # Setup attention metadata
+    attn_metadata_builder_cls, _ = get_attention_backend(_Backend.FLASH_ATTN)
+
+    attn_metadata_builder = attn_metadata_builder_cls(
+        kv_cache_spec=create_standard_kv_cache_spec(proposer.vllm_config),
+        layer_names=proposer.attn_layer_names,
+        vllm_config=proposer.vllm_config,
+        device=device,
+    )
+
+    proposer.runner = mock.MagicMock()
+    proposer.attn_metadata_builder = attn_metadata_builder
+
+    # Run propose
+    result = proposer.propose(target_token_ids=target_token_ids,
+                              target_positions=target_positions,
+                              target_hidden_states=target_hidden_states,
+                              next_token_ids=next_token_ids,
+                              last_token_indices=None,
+                              common_attn_metadata=common_attn_metadata,
+                              sampling_metadata=sampling_metadata)
+
+    # Verify the model was called correctly
+    assert model_mock.called
+    # Verify output shape
+    assert result.shape == (batch_size, num_speculative_tokens)

tests/v1/utils.py

@@ -1,71 +1,10 @@
 # SPDX-License-Identifier: Apache-2.0
 # SPDX-FileCopyrightText: Copyright contributors to the vLLM project
-
 import pytest
 import regex as re
 import requests
-import torch
 
 from tests.utils import RemoteOpenAIServer
-from vllm.v1.worker.utils import bind_kv_cache
-
-
-def test_bind_kv_cache():
-    from vllm.attention import Attention
-
-    ctx = {
-        'layers.0.self_attn': Attention(32, 128, 0.1),
-        'layers.1.self_attn': Attention(32, 128, 0.1),
-        'layers.2.self_attn': Attention(32, 128, 0.1),
-        'layers.3.self_attn': Attention(32, 128, 0.1),
-    }
-    kv_cache = {
-        'layers.0.self_attn': torch.zeros((1, )),
-        'layers.1.self_attn': torch.zeros((1, )),
-        'layers.2.self_attn': torch.zeros((1, )),
-        'layers.3.self_attn': torch.zeros((1, )),
-    }
-    runner_kv_caches: list[torch.Tensor] = []
-    bind_kv_cache(kv_cache, ctx, runner_kv_caches)
-    assert ctx['layers.0.self_attn'].kv_cache[0] is kv_cache[
-        'layers.0.self_attn']
-    assert ctx['layers.1.self_attn'].kv_cache[0] is kv_cache[
-        'layers.1.self_attn']
-    assert ctx['layers.2.self_attn'].kv_cache[0] is kv_cache[
-        'layers.2.self_attn']
-    assert ctx['layers.3.self_attn'].kv_cache[0] is kv_cache[
-        'layers.3.self_attn']
-
-    assert runner_kv_caches[0] is kv_cache['layers.0.self_attn']
-    assert runner_kv_caches[1] is kv_cache['layers.1.self_attn']
-    assert runner_kv_caches[2] is kv_cache['layers.2.self_attn']
-    assert runner_kv_caches[3] is kv_cache['layers.3.self_attn']
-
-
-def test_bind_kv_cache_non_attention():
-    from vllm.attention import Attention
-
-    # example from Jamba PP=2
-    ctx = {
-        'model.layers.20.attn': Attention(32, 128, 0.1),
-        'model.layers.28.attn': Attention(32, 128, 0.1),
-    }
-    kv_cache = {
-        'model.layers.20.attn': torch.zeros((1, )),
-        'model.layers.28.attn': torch.zeros((1, )),
-    }
-
-    runner_kv_caches: list[torch.Tensor] = []
-    bind_kv_cache(kv_cache, ctx, runner_kv_caches)
-
-    assert ctx['model.layers.20.attn'].kv_cache[0] is kv_cache[
-        'model.layers.20.attn']
-    assert ctx['model.layers.28.attn'].kv_cache[0] is kv_cache[
-        'model.layers.28.attn']
-
-    assert runner_kv_caches[0] is kv_cache['model.layers.20.attn']
-    assert runner_kv_caches[1] is kv_cache['model.layers.28.attn']
-
 
 # Prometheus metrics utilities for testing