[V0 deprecation] Remove V0 CPU/XPU/TPU backends (#20412)

Signed-off-by: Woosuk Kwon <woosuk.kwon@berkeley.edu>
Signed-off-by: jiang1.li <jiang1.li@intel.com>
Co-authored-by: Li, Jiang <jiang1.li@intel.com>

Author: WoosukKwon

.buildkite/scripts/hardware_ci/run-cpu-test.sh

@@ -66,10 +66,10 @@ function cpu_tests() {
     tests/quantization/test_compressed_tensors.py::test_compressed_tensors_w8a8_dynamic_per_token"
 
   # Run AWQ test
-  docker exec cpu-test-"$NUMA_NODE" bash -c "
-    set -e
-    VLLM_USE_V1=0 pytest -s -v \
-    tests/quantization/test_ipex_quant.py"
+  # docker exec cpu-test-"$NUMA_NODE" bash -c "
+  #   set -e
+  #   VLLM_USE_V1=0 pytest -s -v \
+  #   tests/quantization/test_ipex_quant.py"
 
   # Run chunked-prefill and prefix-cache test
   docker exec cpu-test-"$NUMA_NODE" bash -c "

.buildkite/scripts/hardware_ci/run-xpu-test.sh

@@ -26,7 +26,5 @@ docker run \
     --name "${container_name}" \
     "${image_name}" \
     sh -c '
-    VLLM_USE_V1=0 python3 examples/offline_inference/basic/generate.py --model facebook/opt-125m
-    VLLM_USE_V1=0 python3 examples/offline_inference/basic/generate.py --model facebook/opt-125m -tp 2
     VLLM_USE_V1=1 python3 examples/offline_inference/basic/generate.py --model facebook/opt-125m --block-size 64 --enforce-eager
 '

examples/online_serving/chart-helm/values.yaml

@@ -8,7 +8,7 @@ image:
   # -- Image tag
   tag: "latest"
   # -- Container launch command
-  command: ["vllm", "serve", "/data/", "--served-model-name", "opt-125m", "--dtype", "float32", "--block-size", "16", "--host", "0.0.0.0", "--port", "8000"]
+  command: ["vllm", "serve", "/data/", "--served-model-name", "opt-125m", "--enforce-eager", "--dtype", "bfloat16", "--block-size", "16", "--host", "0.0.0.0", "--port", "8000"]
 
 # -- Container port
 containerPort: 8000

tests/kernels/attention/test_attention_selector.py

@@ -36,7 +36,8 @@ def clear_cache():
 DEVICE_MLA_BLOCK_SIZES = {
     "cuda": [16, 64],  # CUDA supports both standard and extended block sizes
     "hip": [16, 1],  # HIP requires special handling for block_size=1
-    "cpu": [16]  # CPU uses fixed block size from test cases
+    # "cpu": [16]  # CPU uses fixed block size from test cases
+    "cpu": []  # FIXME(woosuk): Temporarily disable CPU tests
 }
 
 
@@ -81,14 +82,14 @@ def test_env(
         m.setenv("VLLM_MLA_DISABLE", "1" if use_mla else "0")
 
         if device == "cpu":
+            if not use_v1:
+                pytest.skip("CPU backend only supports V1")
+
             with patch("vllm.attention.selector.current_platform",
                        CpuPlatform()):
                 backend = get_attn_backend(16, torch.float16, torch.float16,
                                            block_size, False)
-            if use_v1:
-                assert backend.get_name() == "TORCH_SDPA_VLLM_V1"
-            else:
-                assert backend.get_name() == "TORCH_SDPA"
+            assert backend.get_name() == "TORCH_SDPA_VLLM_V1"
 
         elif device == "hip":
             with patch("vllm.attention.selector.current_platform",
@@ -193,12 +194,14 @@ def test_fp32_fallback(
         m.setenv("VLLM_USE_V1", "1" if use_v1 else "0")
 
         if device == "cpu":
+            if not use_v1:
+                pytest.skip("CPU backend only supports V1")
+
             with patch("vllm.attention.selector.current_platform",
                        CpuPlatform()):
                 backend = get_attn_backend(16, torch.float32, torch.float32,
                                            16, False)
-            assert (backend.get_name() == "TORCH_SDPA_VLLM_V1"
-                    if use_v1 else "TORCH_SDPA")
+            assert backend.get_name() == "TORCH_SDPA_VLLM_V1"
 
         elif device == "cuda":
             with patch("vllm.attention.selector.current_platform",