---
id: pr-vllm-33451
repo: vllm-project/vllm
pr: 33451
title: '[Attention] Add FlashInfer Sparse MLA backend'
author: MatthewBonanni
date: '2026-02-12'
url: https://github.com/vllm-project/vllm/pull/33451
source_category: upstream-code
architectures:
- sm100
tags: []
techniques: []
hardware_features: []
kernel_types: []
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: f2c47886fdbabfeae7ddad871ee7889ee472d026
inclusion_reason: defer
changed_paths:
- benchmarks/attention_benchmarks/benchmark.py
- benchmarks/attention_benchmarks/common.py
- benchmarks/attention_benchmarks/configs/mla_decode.yaml
- benchmarks/attention_benchmarks/configs/mla_mixed_batch.yaml
- benchmarks/attention_benchmarks/configs/mla_prefill.yaml
- benchmarks/attention_benchmarks/configs/reorder_threshold.yaml
- benchmarks/attention_benchmarks/configs/speculative_decode.yaml
- benchmarks/attention_benchmarks/configs/standard_attention.yaml
- benchmarks/attention_benchmarks/mla_runner.py
- benchmarks/attention_benchmarks/runner.py
- docs/design/attention_backends.md
- tests/v1/attention/test_sparse_mla_backends.py
- tools/pre_commit/generate_attention_backend_docs.py
- vllm/model_executor/layers/attention/mla_attention.py
- vllm/platforms/cpu.py
- vllm/platforms/cuda.py
- vllm/platforms/interface.py
- vllm/platforms/rocm.py
- vllm/platforms/xpu.py
- vllm/v1/attention/backends/mla/flashinfer_mla_sparse.py
- vllm/v1/attention/backends/mla/flashmla_sparse.py
- vllm/v1/attention/backends/mla/sparse_utils.py
- vllm/v1/attention/backends/registry.py
- vllm/v1/attention/selector.py
artifact_dir: evidence/pull-bundles/vllm/gh-33451
head_ref_oid: c69830b24fc96bf6b0dd37fdd0601a4b94bac134
---
# [Attention] Add FlashInfer Sparse MLA backend

- Repository: `vllm-project/vllm`
- PR: [33451](https://github.com/vllm-project/vllm/pull/33451)
- Decision: `defer`
- Reason: defer

## Changed Paths

- `benchmarks/attention_benchmarks/benchmark.py`
- `benchmarks/attention_benchmarks/common.py`
- `benchmarks/attention_benchmarks/configs/mla_decode.yaml`
- `benchmarks/attention_benchmarks/configs/mla_mixed_batch.yaml`
- `benchmarks/attention_benchmarks/configs/mla_prefill.yaml`
- `benchmarks/attention_benchmarks/configs/reorder_threshold.yaml`
- `benchmarks/attention_benchmarks/configs/speculative_decode.yaml`
- `benchmarks/attention_benchmarks/configs/standard_attention.yaml`
- `benchmarks/attention_benchmarks/mla_runner.py`
- `benchmarks/attention_benchmarks/runner.py`
- `docs/design/attention_backends.md`
- `tests/v1/attention/test_sparse_mla_backends.py`
- `tools/pre_commit/generate_attention_backend_docs.py`
- `vllm/model_executor/layers/attention/mla_attention.py`
- `vllm/platforms/cpu.py`
- `vllm/platforms/cuda.py`
- `vllm/platforms/interface.py`
- `vllm/platforms/rocm.py`
- `vllm/platforms/xpu.py`
- `vllm/v1/attention/backends/mla/flashinfer_mla_sparse.py`
- `vllm/v1/attention/backends/mla/flashmla_sparse.py`
- `vllm/v1/attention/backends/mla/sparse_utils.py`
- `vllm/v1/attention/backends/registry.py`
- `vllm/v1/attention/selector.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-33451`
