---
id: pr-vllm-21963
repo: vllm-project/vllm
pr: 21963
title: Fix Flashinfer CUTLASS MOE Allgather
author: wenscarl
date: '2025-08-08'
url: https://github.com/vllm-project/vllm/pull/21963
source_category: upstream-code
architectures:
- sm100
tags:
- kernel-fusion
- moe
techniques:
- kernel-fusion
hardware_features: []
kernel_types:
- moe
languages:
- cuda-cpp
captured_at: '2026-04-27'
status: merged
merge_sha: b2c8ce57c68db0764a49d66f048b8a7a5cef9d13
inclusion_reason: kernel file changes
changed_paths:
- vllm/distributed/device_communicators/cuda_communicator.py
- vllm/forward_context.py
- vllm/model_executor/layers/fused_moe/flashinfer_cutlass_prepare_finalize.py
- vllm/model_executor/layers/fused_moe/layer.py
head_ref_oid: f8aff21ff4519130a7eae7f9d6e4a8ca346af4dc
artifact_dir: evidence/pull-bundles/vllm/gh-21963
---
# Fix Flashinfer CUTLASS MOE Allgather

- Repository: `vllm-project/vllm`
- PR: [21963](https://github.com/vllm-project/vllm/pull/21963)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `vllm/distributed/device_communicators/cuda_communicator.py`
- `vllm/forward_context.py`
- `vllm/model_executor/layers/fused_moe/flashinfer_cutlass_prepare_finalize.py`
- `vllm/model_executor/layers/fused_moe/layer.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-21963`
