---
id: pr-vllm-24521
repo: vllm-project/vllm
pr: 24521
title: '[Feature] Disallow FlashMLA on Blackwell'
author: yewentao256
date: '2025-09-09'
url: https://github.com/vllm-project/vllm/pull/24521
source_category: upstream-code
architectures:
- sm100
tags:
- attention
- mla
techniques: []
hardware_features: []
kernel_types:
- attention
- mla
languages:
- python
captured_at: '2026-04-27'
status: merged
merge_sha: 15de5ff9ea30950212b724818c716084528a2f7b
inclusion_reason: kernel file changes
changed_paths:
- vllm/attention/backends/flashmla.py
- vllm/v1/attention/backends/mla/flashmla.py
head_ref_oid: cb40ea88cd80fdebfd1b67a2311226727968b181
artifact_dir: evidence/pull-bundles/vllm/gh-24521
---
# [Feature] Disallow FlashMLA on Blackwell

- Repository: `vllm-project/vllm`
- PR: [24521](https://github.com/vllm-project/vllm/pull/24521)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `vllm/attention/backends/flashmla.py`
- `vllm/v1/attention/backends/mla/flashmla.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-24521`
