[v1] Pass BlockTable and KVCacheSpec to AttentionMetadataBuilders (#17483)

Signed-off-by: Chen Zhang <zhangch99@outlook.com>

tests/v1/worker/test_gpu_model_runner.py

@@ -1,14 +1,31 @@
 # SPDX-License-Identifier: Apache-2.0
+import weakref
+
 import pytest
+import torch
 
 from vllm.config import CacheConfig, ModelConfig, SchedulerConfig, VllmConfig
 from vllm.sampling_params import SamplingParams
 from vllm.v1.core.sched.output import (CachedRequestData, NewRequestData,
                                        SchedulerOutput)
+from vllm.v1.kv_cache_interface import FullAttentionSpec
 from vllm.v1.sample.metadata import SamplingMetadata
 from vllm.v1.worker.gpu_model_runner import GPUModelRunner
 
 
+def initialize_kv_cache(runner: GPUModelRunner):
+    """
+    Only perform necessary steps in GPUModelRunner.initialize_kv_cache()
+    """
+    kv_cache_spec = FullAttentionSpec(block_size=16,
+                                      num_kv_heads=1,
+                                      head_size=64,
+                                      dtype=torch.float16,
+                                      use_mla=False)
+    runner.attn_metadata_builder = runner.attn_backend.get_builder_cls()(
+        weakref.proxy(runner), kv_cache_spec, runner.input_batch.block_table)
+
+
 @pytest.fixture
 def model_runner():
     scheduler_config = SchedulerConfig(
@@ -38,7 +55,9 @@ def model_runner():
     )
 
     device = "cuda"
-    return GPUModelRunner(vllm_config, device)
+    runner = GPUModelRunner(vllm_config, device)
+    initialize_kv_cache(runner)
+    return runner
 
 
 def _schedule_new_request(*req_ids: str) -> SchedulerOutput: