[CPU] Improve CPU Docker build (#30953)

Signed-off-by: Maryam Tahhan <mtahhan@redhat.com>
Co-authored-by: Li, Jiang <jiang1.li@intel.com>

cmake/cpu_extension.cmake

@@ -13,6 +13,8 @@ endif()
 #
 # Define environment variables for special configurations
 #
+set(ENABLE_AVX2 $ENV{VLLM_CPU_AVX2})
+set(ENABLE_AVX512 $ENV{VLLM_CPU_AVX512})
 set(ENABLE_AVX512BF16 $ENV{VLLM_CPU_AVX512BF16})
 set(ENABLE_AVX512VNNI $ENV{VLLM_CPU_AVX512VNNI})
 set(ENABLE_AMXBF16 $ENV{VLLM_CPU_AMXBF16})
@@ -103,6 +105,16 @@ else()
     find_isa(${CPUINFO} "bf16" ARM_BF16_FOUND) # Check for ARM BF16 support
     find_isa(${CPUINFO} "S390" S390_FOUND)
     find_isa(${CPUINFO} "v" RVV_FOUND) # Check for RISC-V RVV support
+
+    # Support cross-compilation by allowing override via environment variables
+    if (ENABLE_AVX2)
+        set(AVX2_FOUND ON)
+        message(STATUS "AVX2 support enabled via VLLM_CPU_AVX2 environment variable")
+    endif()
+    if (ENABLE_AVX512)
+        set(AVX512_FOUND ON)
+        message(STATUS "AVX512 support enabled via VLLM_CPU_AVX512 environment variable")
+    endif()
 endif()
 
 if (AVX512_FOUND AND NOT AVX512_DISABLED)

docker/Dockerfile.cpu

@@ -15,9 +15,11 @@
 # Build arguments:
 #   PYTHON_VERSION=3.13|3.12 (default)|3.11|3.10
 #   VLLM_CPU_DISABLE_AVX512=false (default)|true
-#   VLLM_CPU_AVX512BF16=false (default)|true
-#   VLLM_CPU_AVX512VNNI=false (default)|true
-#   VLLM_CPU_AMXBF16=false |true (default)
+#   VLLM_CPU_AVX2=false (default)|true (for cross-compilation)
+#   VLLM_CPU_AVX512=false (default)|true (for cross-compilation)
+#   VLLM_CPU_AVX512BF16=false (default)|true (for cross-compilation)
+#   VLLM_CPU_AVX512VNNI=false (default)|true (for cross-compilation)
+#   VLLM_CPU_AMXBF16=false (default)|true (for cross-compilation)
 #
 
 ######################### COMMON BASE IMAGE #########################
@@ -54,9 +56,12 @@ ENV PIP_EXTRA_INDEX_URL=${PIP_EXTRA_INDEX_URL}
 ENV UV_EXTRA_INDEX_URL=${PIP_EXTRA_INDEX_URL}
 ENV UV_INDEX_STRATEGY="unsafe-best-match"
 ENV UV_LINK_MODE="copy"
+
+# Copy requirements files for installation
+COPY requirements/common.txt requirements/common.txt
+COPY requirements/cpu.txt requirements/cpu.txt
+
 RUN --mount=type=cache,target=/root/.cache/uv \
-    --mount=type=bind,src=requirements/common.txt,target=requirements/common.txt \
-    --mount=type=bind,src=requirements/cpu.txt,target=requirements/cpu.txt \
     uv pip install --upgrade pip && \
     uv pip install -r requirements/cpu.txt
 
@@ -88,6 +93,12 @@ ARG GIT_REPO_CHECK=0
 # Support for building with non-AVX512 vLLM: docker build --build-arg VLLM_CPU_DISABLE_AVX512="true" ...
 ARG VLLM_CPU_DISABLE_AVX512=0
 ENV VLLM_CPU_DISABLE_AVX512=${VLLM_CPU_DISABLE_AVX512}
+# Support for cross-compilation with AVX2 ISA: docker build --build-arg VLLM_CPU_AVX2="1" ...
+ARG VLLM_CPU_AVX2=0
+ENV VLLM_CPU_AVX2=${VLLM_CPU_AVX2}
+# Support for cross-compilation with AVX512 ISA: docker build --build-arg VLLM_CPU_AVX512="1" ...
+ARG VLLM_CPU_AVX512=0
+ENV VLLM_CPU_AVX512=${VLLM_CPU_AVX512}
 # Support for building with AVX512BF16 ISA: docker build --build-arg VLLM_CPU_AVX512BF16="true" ...
 ARG VLLM_CPU_AVX512BF16=0
 ENV VLLM_CPU_AVX512BF16=${VLLM_CPU_AVX512BF16}
@@ -100,18 +111,19 @@ ENV VLLM_CPU_AMXBF16=${VLLM_CPU_AMXBF16}
 
 WORKDIR /workspace/vllm
 
+# Copy build requirements
+COPY requirements/cpu-build.txt requirements/build.txt
+
 RUN --mount=type=cache,target=/root/.cache/uv \
-    --mount=type=bind,src=requirements/cpu-build.txt,target=requirements/build.txt \
     uv pip install -r requirements/build.txt
 
 COPY . .
-RUN --mount=type=bind,source=.git,target=.git \
-    if [ "$GIT_REPO_CHECK" != 0 ]; then bash tools/check_repo.sh ; fi
+
+RUN if [ "$GIT_REPO_CHECK" != 0 ]; then bash tools/check_repo.sh ; fi
 
 RUN --mount=type=cache,target=/root/.cache/uv \
     --mount=type=cache,target=/root/.cache/ccache \
     --mount=type=cache,target=/workspace/vllm/.deps,sharing=locked \
-    --mount=type=bind,source=.git,target=.git \
     VLLM_TARGET_DEVICE=cpu python3 setup.py bdist_wheel --dist-dir=dist --py-limited-api=cp38
 
 ######################### TEST DEPS #########################
@@ -119,9 +131,11 @@ FROM base AS vllm-test-deps
 
 WORKDIR /workspace/vllm
 
+# Copy test requirements
+COPY requirements/test.in requirements/cpu-test.in
+
 # TODO: Update to 2.9.0 when there is a new build for intel_extension_for_pytorch for that version
-RUN --mount=type=bind,src=requirements/test.in,target=requirements/test.in \
-    cp requirements/test.in requirements/cpu-test.in && \
+RUN \
     sed -i '/mamba_ssm/d' requirements/cpu-test.in && \
     remove_packages_not_supported_on_aarch64() { \
       case "$(uname -m)" in \
@@ -200,4 +214,29 @@ RUN --mount=type=cache,target=/root/.cache/uv \
     --mount=type=bind,from=vllm-build,src=/workspace/vllm/dist,target=dist \
     uv pip install dist/*.whl
 
+# Add labels to document build configuration
+LABEL org.opencontainers.image.title="vLLM CPU"
+LABEL org.opencontainers.image.description="vLLM inference engine for CPU platforms"
+LABEL org.opencontainers.image.vendor="vLLM Project"
+LABEL org.opencontainers.image.source="https://github.com/vllm-project/vllm"
+
+# Build configuration labels
+ARG TARGETARCH
+ARG VLLM_CPU_DISABLE_AVX512
+ARG VLLM_CPU_AVX2
+ARG VLLM_CPU_AVX512
+ARG VLLM_CPU_AVX512BF16
+ARG VLLM_CPU_AVX512VNNI
+ARG VLLM_CPU_AMXBF16
+ARG PYTHON_VERSION
+
+LABEL ai.vllm.build.target-arch="${TARGETARCH}"
+LABEL ai.vllm.build.cpu-disable-avx512="${VLLM_CPU_DISABLE_AVX512:-false}"
+LABEL ai.vllm.build.cpu-avx2="${VLLM_CPU_AVX2:-false}"
+LABEL ai.vllm.build.cpu-avx512="${VLLM_CPU_AVX512:-false}"
+LABEL ai.vllm.build.cpu-avx512bf16="${VLLM_CPU_AVX512BF16:-false}"
+LABEL ai.vllm.build.cpu-avx512vnni="${VLLM_CPU_AVX512VNNI:-false}"
+LABEL ai.vllm.build.cpu-amxbf16="${VLLM_CPU_AMXBF16:-false}"
+LABEL ai.vllm.build.python-version="${PYTHON_VERSION:-3.12}"
+
 ENTRYPOINT ["vllm", "serve"]

docs/getting_started/installation/cpu.x86.inc.md

@@ -164,21 +164,76 @@ uv pip install dist/*.whl
 [https://gallery.ecr.aws/q9t5s3a7/vllm-cpu-release-repo](https://gallery.ecr.aws/q9t5s3a7/vllm-cpu-release-repo)
 
 !!! warning
-    If deploying the pre-built images on machines without `avx512f`, `avx512_bf16`, or `avx512_vnni` support, an `Illegal instruction` error may be raised. It is recommended to build images for these machines with the appropriate build arguments (e.g., `--build-arg VLLM_CPU_DISABLE_AVX512=true`, `--build-arg VLLM_CPU_AVX512BF16=false`, or `--build-arg VLLM_CPU_AVX512VNNI=false`) to disable unsupported features. Please note that without `avx512f`, AVX2 will be used and this version is not recommended because it only has basic feature support.
+    If deploying the pre-built images on machines without `avx512f`, `avx512_bf16`, or `avx512_vnni` support, an `Illegal instruction` error may be raised. See the build-image-from-source section below for build arguments to match your target CPU capabilities.
 
 # --8<-- [end:pre-built-images]
 # --8<-- [start:build-image-from-source]
 
+## Building for your target CPU
+
+vLLM supports building Docker images for x86 CPU platforms with automatic instruction set detection.
+
+### Basic build command
+
+```bash
+docker build -f docker/Dockerfile.cpu \
+        --build-arg VLLM_CPU_DISABLE_AVX512=<false (default)|true> \
+        --build-arg VLLM_CPU_AVX2=<false (default)|true> \
+        --build-arg VLLM_CPU_AVX512=<false (default)|true> \
+        --build-arg VLLM_CPU_AVX512BF16=<false (default)|true> \
+        --build-arg VLLM_CPU_AVX512VNNI=<false (default)|true> \
+        --build-arg VLLM_CPU_AMXBF16=<false|true (default)> \
+        --tag vllm-cpu-env \
+        --target vllm-openai .
+```
+
+!!! note "Instruction set auto-detection"
+    By default, vLLM will auto-detect CPU instruction sets (AVX512, AVX2, etc.) from the build system's CPU flags. Build arguments like `VLLM_CPU_AVX2`, `VLLM_CPU_AVX512`, `VLLM_CPU_AVX512BF16`, `VLLM_CPU_AVX512VNNI`, and `VLLM_CPU_AMXBF16` are primarily used for **cross-compilation** or for building container images on systems that don't have the target platforms ISA:
+
+    - Set `VLLM_CPU_{ISA}=true` to force-enable an instruction set (for cross-compilation to target platforms with that ISA)
+    - Set `VLLM_CPU_{ISA}=false` to rely on auto-detection
+    - When an ISA build arg is set to `true`, vLLM will build with that instruction set regardless of the build system's CPU capabilities
+
+### Build examples
+
+**Example 1: Auto-detection (native build)**
+
+Build on a machine with the same CPU as your target deployment:
+
 ```bash
+# Auto-detects all CPU features from the build system
 docker build -f docker/Dockerfile.cpu \
-        --build-arg VLLM_CPU_AVX512BF16=false (default)|true \
-        --build-arg VLLM_CPU_AVX512VNNI=false (default)|true \
-        --build-arg VLLM_CPU_AMXBF16=false|true (default) \
-        --build-arg VLLM_CPU_DISABLE_AVX512=false (default)|true \ 
         --tag vllm-cpu-env \
         --target vllm-openai .
+```
+
+**Example 2: Cross-compilation for AVX512 deployment**
 
-# Launching OpenAI server
+Build an AVX512 image on any x86_64 system (even without AVX512):
+
+```bash
+docker build -f docker/Dockerfile.cpu \
+        --build-arg VLLM_CPU_AVX512=true \
+        --build-arg VLLM_CPU_AVX512BF16=true \
+        --build-arg VLLM_CPU_AVX512VNNI=true \
+        --tag vllm-cpu-avx512 \
+        --target vllm-openai .
+```
+
+**Example 3: Cross-compilation for AVX2 deployment**
+
+Build an AVX2 image for older CPUs:
+
+```bash
+docker build -f docker/Dockerfile.cpu \
+        --build-arg VLLM_CPU_AVX2=true \
+        --tag vllm-cpu-avx2 \
+        --target vllm-openai .
+```
+
+## Launching the OpenAI server
+
+```bash
 docker run --rm \
             --security-opt seccomp=unconfined \
             --cap-add SYS_NICE \