---
id: pr-vllm-37090
repo: vllm-project/vllm
pr: 37090
title: '[Bugfix] Disable cross-layer KV cache for MLA attention backends'
author: haosdent
date: '2026-03-16'
url: https://github.com/vllm-project/vllm/pull/37090
source_category: upstream-code
architectures:
- sm100
tags:
- attention
- mla
techniques: []
hardware_features: []
kernel_types:
- attention
- mla
languages:
- python
captured_at: '2026-04-17'
status: merged
merge_sha: ca1954d58c49e3a3209ec86d743a99f3a605028b
inclusion_reason: kernel file changes
changed_paths:
- tests/v1/kv_connector/unit/test_kv_cache_layout.py
- vllm/distributed/kv_transfer/kv_connector/v1/offloading_connector.py
- vllm/model_executor/layers/attention/mla_attention.py
- vllm/v1/attention/backends/mla/indexer.py
- vllm/v1/worker/kv_connector_model_runner_mixin.py
head_ref_oid: d9480f806d2ca242706c91f6b310dfb08129b46c
artifact_dir: evidence/pull-bundles/vllm/gh-37090
---
# [Bugfix] Disable cross-layer KV cache for MLA attention backends

- Repository: `vllm-project/vllm`
- PR: [37090](https://github.com/vllm-project/vllm/pull/37090)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `tests/v1/kv_connector/unit/test_kv_cache_layout.py`
- `vllm/distributed/kv_transfer/kv_connector/v1/offloading_connector.py`
- `vllm/model_executor/layers/attention/mla_attention.py`
- `vllm/v1/attention/backends/mla/indexer.py`
- `vllm/v1/worker/kv_connector_model_runner_mixin.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-37090`
