---
id: pr-vllm-29084
repo: vllm-project/vllm
pr: 29084
title: '[Attention] Refactor FA `block_size` limitations to hybrid models only '
author: NickLucche
date: '2025-11-22'
url: https://github.com/vllm-project/vllm/pull/29084
source_category: upstream-code
architectures:
- sm100
tags: []
techniques: []
hardware_features: []
kernel_types: []
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: 066209a045216c87bd582be97830eae728a29369
inclusion_reason: defer
changed_paths:
- tests/v1/attention/test_mla_backends.py
- tests/v1/worker/test_gpu_model_runner.py
- vllm/attention/backends/abstract.py
- vllm/v1/attention/backends/flash_attn.py
- vllm/v1/attention/backends/flashinfer.py
- vllm/v1/attention/backends/mla/cutlass_mla.py
- vllm/v1/attention/backends/mla/flashattn_mla.py
- vllm/v1/attention/backends/mla/flashinfer_mla.py
- vllm/v1/attention/backends/mla/flashmla.py
- vllm/v1/attention/backends/mla/flashmla_sparse.py
- vllm/v1/attention/backends/mla/indexer.py
- vllm/v1/attention/backends/mla/rocm_aiter_mla.py
- vllm/v1/attention/backends/rocm_aiter_fa.py
- vllm/v1/attention/backends/tree_attn.py
- vllm/v1/attention/backends/triton_attn.py
- vllm/v1/attention/backends/xformers.py
- vllm/v1/worker/gpu_model_runner.py
artifact_dir: evidence/pull-bundles/vllm/gh-29084
head_ref_oid: 4957f24a27b7db9d1d9738417493bc785f1972fd
---
# [Attention] Refactor FA `block_size` limitations to hybrid models only 

- Repository: `vllm-project/vllm`
- PR: [29084](https://github.com/vllm-project/vllm/pull/29084)
- Decision: `defer`
- Reason: defer

## Changed Paths

- `tests/v1/attention/test_mla_backends.py`
- `tests/v1/worker/test_gpu_model_runner.py`
- `vllm/attention/backends/abstract.py`
- `vllm/v1/attention/backends/flash_attn.py`
- `vllm/v1/attention/backends/flashinfer.py`
- `vllm/v1/attention/backends/mla/cutlass_mla.py`
- `vllm/v1/attention/backends/mla/flashattn_mla.py`
- `vllm/v1/attention/backends/mla/flashinfer_mla.py`
- `vllm/v1/attention/backends/mla/flashmla.py`
- `vllm/v1/attention/backends/mla/flashmla_sparse.py`
- `vllm/v1/attention/backends/mla/indexer.py`
- `vllm/v1/attention/backends/mla/rocm_aiter_mla.py`
- `vllm/v1/attention/backends/rocm_aiter_fa.py`
- `vllm/v1/attention/backends/tree_attn.py`
- `vllm/v1/attention/backends/triton_attn.py`
- `vllm/v1/attention/backends/xformers.py`
- `vllm/v1/worker/gpu_model_runner.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-29084`
