---
id: pr-vllm-24864
repo: vllm-project/vllm
pr: 24864
title: '[DCP] Support Decode Context Parallel (DCP) for GQA with FlashAttention'
author: FENP
date: '2025-10-14'
url: https://github.com/vllm-project/vllm/pull/24864
source_category: upstream-code
architectures:
- sm100
tags:
- attention
- decode
techniques: []
hardware_features: []
kernel_types:
- attention
- decode
languages:
- python
captured_at: '2026-04-27'
status: merged
merge_sha: ea97940d6c2a0b56affa0d288b046acde4be616e
inclusion_reason: kernel file changes
changed_paths:
- tests/distributed/test_context_parallel.py
- tests/models/registry.py
- vllm/attention/ops/common.py
- vllm/config/model.py
- vllm/v1/attention/backends/flash_attn.py
- vllm/v1/attention/backends/utils.py
- vllm/v1/worker/gpu_model_runner.py
head_ref_oid: 02671fa39b880a3288bef368d744560e8ae196e4
artifact_dir: evidence/pull-bundles/vllm/gh-24864
---
# [DCP] Support Decode Context Parallel (DCP) for GQA with FlashAttention

- Repository: `vllm-project/vllm`
- PR: [24864](https://github.com/vllm-project/vllm/pull/24864)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `tests/distributed/test_context_parallel.py`
- `tests/models/registry.py`
- `vllm/attention/ops/common.py`
- `vllm/config/model.py`
- `vllm/v1/attention/backends/flash_attn.py`
- `vllm/v1/attention/backends/utils.py`
- `vllm/v1/worker/gpu_model_runner.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-24864`
