---
id: pr-vllm-25509
repo: vllm-project/vllm
pr: 25509
title: '[Bugfix] [B200] cutlass_mla - ensure kv_split == 1 for batch size > 1'
author: alexm-redhat
date: '2025-09-23'
url: https://github.com/vllm-project/vllm/pull/25509
source_category: upstream-code
architectures:
- sm100
tags:
- attention
- mla
techniques: []
hardware_features: []
kernel_types:
- attention
- mla
languages:
- cuda-cpp
captured_at: '2026-04-27'
status: merged
merge_sha: 1210e4d95b515507cd151ee76ef947999fdcbe59
inclusion_reason: kernel file changes
changed_paths:
- csrc/attention/mla/cutlass_sm100_mla/device/sm100_mla.hpp
head_ref_oid: 362605acdd9f0e06e21e176a11175fa6e0314dd0
artifact_dir: evidence/pull-bundles/vllm/gh-25509
---
# [Bugfix] [B200] cutlass_mla - ensure kv_split == 1 for batch size > 1

- Repository: `vllm-project/vllm`
- PR: [25509](https://github.com/vllm-project/vllm/pull/25509)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `csrc/attention/mla/cutlass_sm100_mla/device/sm100_mla.hpp`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-25509`
