---
id: pr-vllm-14221
repo: vllm-project/vllm
pr: 14221
title: '[V1][Bugfix] Standardize quantized kv cache rejection for attention backends'
author: mgoin
date: '2025-03-06'
url: https://github.com/vllm-project/vllm/pull/14221
source_category: upstream-code
architectures:
- sm100
tags: []
techniques: []
hardware_features: []
kernel_types: []
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: 6832707e90d460bc1d1eec550e0035af72db7a27
inclusion_reason: defer
changed_paths:
- vllm/attention/backends/abstract.py
- vllm/attention/backends/flash_attn.py
- vllm/attention/backends/flashmla.py
- vllm/attention/backends/hpu_attn.py
- vllm/attention/backends/ipex_attn.py
- vllm/attention/backends/pallas.py
- vllm/attention/backends/torch_sdpa.py
- vllm/attention/backends/triton_mla.py
- vllm/v1/attention/backends/flash_attn.py
- vllm/v1/attention/backends/mla/flashmla.py
- vllm/v1/attention/backends/mla/triton_mla.py
artifact_dir: evidence/pull-bundles/vllm/gh-14221
head_ref_oid: 6ca6d49e4e63e482df17c7dc66e8e0f97752809d
---
# [V1][Bugfix] Standardize quantized kv cache rejection for attention backends

- Repository: `vllm-project/vllm`
- PR: [14221](https://github.com/vllm-project/vllm/pull/14221)
- Decision: `defer`
- Reason: defer

## Changed Paths

- `vllm/attention/backends/abstract.py`
- `vllm/attention/backends/flash_attn.py`
- `vllm/attention/backends/flashmla.py`
- `vllm/attention/backends/hpu_attn.py`
- `vllm/attention/backends/ipex_attn.py`
- `vllm/attention/backends/pallas.py`
- `vllm/attention/backends/torch_sdpa.py`
- `vllm/attention/backends/triton_mla.py`
- `vllm/v1/attention/backends/flash_attn.py`
- `vllm/v1/attention/backends/mla/flashmla.py`
- `vllm/v1/attention/backends/mla/triton_mla.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-14221`
