---
id: pr-vllm-28718
repo: vllm-project/vllm
pr: 28718
title: '[Feature] Prefill Context Parallel (PCP) basic support'
author: pisceskkk
date: '2025-11-19'
url: https://github.com/vllm-project/vllm/pull/28718
source_category: upstream-code
architectures:
- sm100
tags:
- attention
- kernel-fusion
- mla
- moe
- prefill
techniques:
- kernel-fusion
hardware_features: []
kernel_types:
- attention
- mla
- moe
- prefill
languages:
- python
captured_at: '2026-04-27'
status: merged
merge_sha: 2fd893b4cec0975a2a8430077fd9b4f294eb3561
inclusion_reason: kernel file changes
changed_paths:
- tests/distributed/test_context_parallel.py
- tests/kernels/moe/modular_kernel_tools/common.py
- tests/v1/worker/test_gpu_model_runner.py
- vllm/attention/backends/abstract.py
- vllm/attention/ops/common.py
- vllm/config/parallel.py
- vllm/config/vllm.py
- vllm/distributed/parallel_state.py
- vllm/engine/arg_utils.py
- vllm/model_executor/layers/fused_moe/config.py
- vllm/model_executor/layers/fused_moe/layer.py
- vllm/model_executor/models/gpt_oss.py
- vllm/v1/attention/backends/flash_attn.py
- vllm/v1/attention/backends/mla/common.py
- vllm/v1/attention/backends/utils.py
- vllm/v1/core/kv_cache_coordinator.py
- vllm/v1/core/kv_cache_manager.py
- vllm/v1/core/kv_cache_utils.py
- vllm/v1/core/sched/scheduler.py
- vllm/v1/core/single_type_kv_cache_manager.py
- vllm/v1/engine/core.py
- vllm/v1/executor/multiproc_executor.py
- vllm/v1/kv_cache_interface.py
- vllm/v1/worker/block_table.py
- vllm/v1/worker/gpu_input_batch.py
- vllm/v1/worker/gpu_model_runner.py
- vllm/v1/worker/gpu_worker.py
head_ref_oid: a78bb2aa772bb63bdd710866b56a4488b9d02a20
artifact_dir: evidence/pull-bundles/vllm/gh-28718
---
# [Feature] Prefill Context Parallel (PCP) basic support

- Repository: `vllm-project/vllm`
- PR: [28718](https://github.com/vllm-project/vllm/pull/28718)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `tests/distributed/test_context_parallel.py`
- `tests/kernels/moe/modular_kernel_tools/common.py`
- `tests/v1/worker/test_gpu_model_runner.py`
- `vllm/attention/backends/abstract.py`
- `vllm/attention/ops/common.py`
- `vllm/config/parallel.py`
- `vllm/config/vllm.py`
- `vllm/distributed/parallel_state.py`
- `vllm/engine/arg_utils.py`
- `vllm/model_executor/layers/fused_moe/config.py`
- `vllm/model_executor/layers/fused_moe/layer.py`
- `vllm/model_executor/models/gpt_oss.py`
- `vllm/v1/attention/backends/flash_attn.py`
- `vllm/v1/attention/backends/mla/common.py`
- `vllm/v1/attention/backends/utils.py`
- `vllm/v1/core/kv_cache_coordinator.py`
- `vllm/v1/core/kv_cache_manager.py`
- `vllm/v1/core/kv_cache_utils.py`
- `vllm/v1/core/sched/scheduler.py`
- `vllm/v1/core/single_type_kv_cache_manager.py`
- `vllm/v1/engine/core.py`
- `vllm/v1/executor/multiproc_executor.py`
- `vllm/v1/kv_cache_interface.py`
- `vllm/v1/worker/block_table.py`
- `vllm/v1/worker/gpu_input_batch.py`
- `vllm/v1/worker/gpu_model_runner.py`
- `vllm/v1/worker/gpu_worker.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-28718`
