---
id: pr-flashinfer-2559
repo: flashinfer-ai/flashinfer
pr: 2559
title: 'fix: allow fmha_v2_prefill_deepseek on SM121 (DGX Spark)'
author: blake-snc
date: '2026-02-19'
url: https://github.com/flashinfer-ai/flashinfer/pull/2559
source_category: upstream-code
architectures:
- sm100
tags:
- attention
- flash-attention
- prefill
techniques: []
hardware_features: []
kernel_types:
- attention
- flash-attention
- prefill
languages:
- python
captured_at: '2026-04-27'
status: merged
merge_sha: 9e5ec6a0c1f94c48a9593467fcf22b64b3eb2f92
inclusion_reason: kernel file changes
changed_paths:
- flashinfer/prefill.py
- tests/attention/test_fmha_v2_prefill_deepseek.py
head_ref_oid: db94171cfceede02c238464d993531c3e8a930c7
artifact_dir: evidence/pull-bundles/flashinfer/gh-2559
---
# fix: allow fmha_v2_prefill_deepseek on SM121 (DGX Spark)

- Repository: `flashinfer-ai/flashinfer`
- PR: [2559](https://github.com/flashinfer-ai/flashinfer/pull/2559)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `flashinfer/prefill.py`
- `tests/attention/test_fmha_v2_prefill_deepseek.py`

## Evidence Bundle

`evidence/pull-bundles/flashinfer/gh-2559`
