---
id: pr-vllm-21588
repo: vllm-project/vllm
pr: 21588
title: '[Attention] Support multiple attention metadata builders per kv_cache_spec  + proper local attention no hybrid kv cache fix'
author: LucasWilkinson
date: '2025-08-07'
url: https://github.com/vllm-project/vllm/pull/21588
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: 1dc8a70b6d4e8ba4e139f1ddb86a166694f42f21
inclusion_reason: kernel file changes
changed_paths:
- tests/v1/spec_decode/test_eagle.py
- tests/v1/worker/test_gpu_model_runner.py
- vllm/attention/backends/abstract.py
- vllm/attention/layer.py
- vllm/attention/layers/chunked_local_attention.py
- vllm/attention/selector.py
- vllm/model_executor/models/llama4.py
- vllm/v1/attention/backends/utils.py
- vllm/v1/spec_decode/eagle.py
- vllm/v1/worker/cpu_model_runner.py
- vllm/v1/worker/gpu_model_runner.py
- vllm/v1/worker/tpu_model_runner.py
- vllm/v1/worker/utils.py
head_ref_oid: 1e72add90f39b58406d4eee8ac0abd34843d6677
artifact_dir: evidence/pull-bundles/vllm/gh-21588
---
# [Attention] Support multiple attention metadata builders per kv_cache_spec  + proper local attention no hybrid kv cache fix

- Repository: `vllm-project/vllm`
- PR: [21588](https://github.com/vllm-project/vllm/pull/21588)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `tests/v1/spec_decode/test_eagle.py`
- `tests/v1/worker/test_gpu_model_runner.py`
- `vllm/attention/backends/abstract.py`
- `vllm/attention/layer.py`
- `vllm/attention/layers/chunked_local_attention.py`
- `vllm/attention/selector.py`
- `vllm/model_executor/models/llama4.py`
- `vllm/v1/attention/backends/utils.py`
- `vllm/v1/spec_decode/eagle.py`
- `vllm/v1/worker/cpu_model_runner.py`
- `vllm/v1/worker/gpu_model_runner.py`
- `vllm/v1/worker/tpu_model_runner.py`
- `vllm/v1/worker/utils.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-21588`
