Identify "$CROSS_COMPILE" to enable vm_test for cross-compile situation.
Additionally, use "-cpu cortex-a57" flag to accommodate the majority of QEMU CPU lists,
avoiding using "-cpu host," which can cause qemu_system_aarch64 start failure on x86_64 host.
Signed-off-by: Lin Yikai <yikai.lin@xxxxxxxx>
---
tools/testing/selftests/bpf/README.rst | 12 ++++++++-
tools/testing/selftests/bpf/vmtest.sh | 37 +++++++++++++++++++++-----
2 files changed, 42 insertions(+), 7 deletions(-)
diff --git a/tools/testing/selftests/bpf/README.rst b/tools/testing/selftests/bpf/README.rst
index 9b974e425af3..c8e6eb8f299d 100644
--- a/tools/testing/selftests/bpf/README.rst
+++ b/tools/testing/selftests/bpf/README.rst
@@ -79,13 +79,23 @@ In case of linker errors when running selftests, try using static linking:
$ LDLIBS=-static PKG_CONFIG='pkg-config --static' vmtest.sh
+If you want to make corss-compile, such as compile arm64 on x86_64, you can try:
+
+.. code-block:: console
+
+ $ make headers_install
+ $ export PATH=$PATH:{The corss-compile's path}/bin
+ $ export ARCH=arm64
+ $ export CROSS_COMPILE=aarch64-linux-gnu-
+ $ LDLIBS=-static vmtest.sh
+
.. note:: Some distros may not support static linking.
.. note:: The script uses pahole and clang based on host environment setting.
If you want to change pahole and llvm, you can change `PATH` environment
variable in the beginning of script.
-.. note:: The script currently only supports x86_64 and s390x architectures.
+.. note:: The script currently only supports x86_64, s390x and arm64 architectures.
Additional information about selftest failures are
documented here.
diff --git a/tools/testing/selftests/bpf/vmtest.sh b/tools/testing/selftests/bpf/vmtest.sh
index 65d14f3bbe30..c7461ed496ab 100755
--- a/tools/testing/selftests/bpf/vmtest.sh
+++ b/tools/testing/selftests/bpf/vmtest.sh
@@ -4,11 +4,11 @@
set -u
set -e
-# This script currently only works for x86_64 and s390x, as
+# This script currently only works for x86_64, s390x and arm64, as
# it is based on the VM image used by the BPF CI, which is
# available only for these architectures.
-ARCH="$(uname -m)"
-case "${ARCH}" in
+HOST_ARCH="$(uname -m)"
+case "${HOST_ARCH}" in
s390x)
QEMU_BINARY=qemu-system-s390x
QEMU_CONSOLE="ttyS1"
@@ -32,13 +32,38 @@ aarch64)
exit 1
;;
esac
+
+# process CROSS_COMPILE setting to enable cross-compilation
+process_cross_compile() {
+ if [ -z "${CROSS_COMPILE+x}" ]; then
+ return
+ fi
+ case "$1" in
+ x86_64)
+ #Cross-compiling for arm64 on an x86_64 host
+ if [[ $CROSS_COMPILE == *aarch64* ]]; then
+ VM_ARCH=aarch64
+ QEMU_CONSOLE="ttyAMA0,115200"
+ QEMU_BINARY=qemu-system-aarch64
+ QEMU_FLAGS=(-M virt,gic-version=3 -cpu cortex-a57 -smp 8)
+ BZIMAGE="arch/arm64/boot/Image"
+ echo "Setting VM_ARCH from $HOST_ARCH to $VM_ARCH as specified by CROSS_COMPILE"
+ fi
+ ;;
+ esac
+}
+
+VM_ARCH=${HOST_ARCH}
+process_cross_compile "$VM_ARCH"
+
+
DEFAULT_COMMAND="./test_progs"
MOUNT_DIR="mnt"
ROOTFS_IMAGE="root.img"
OUTPUT_DIR="$HOME/.bpf_selftests"
KCONFIG_REL_PATHS=("tools/testing/selftests/bpf/config"
"tools/testing/selftests/bpf/config.vm"
- "tools/testing/selftests/bpf/config.${ARCH}")
+ "tools/testing/selftests/bpf/config.${VM_ARCH}")
INDEX_URL="https://raw.githubusercontent.com/libbpf/ci/master/INDEX";
NUM_COMPILE_JOBS="$(nproc)"
LOG_FILE_BASE="$(date +"bpf_selftests.%Y-%m-%d_%H-%M-%S")"
@@ -109,7 +134,7 @@ newest_rootfs_version()
{
{
for file in "${!URLS[@]}"; do
- if [[ $file =~ ^"${ARCH}"/libbpf-vmtest-rootfs-(.*)\.tar\.zst$ ]]; then
+ if [[ $file =~ ^"${VM_ARCH}"/libbpf-vmtest-rootfs-(.*)\.tar\.zst$ ]]; then
echo "${BASH_REMATCH[1]}"
fi
done
@@ -126,7 +151,7 @@ download_rootfs()
exit 1
fi
- download "${ARCH}/libbpf-vmtest-rootfs-$rootfsversion.tar.zst" |
+ download "${VM_ARCH}/libbpf-vmtest-rootfs-$rootfsversion.tar.zst" |
zstd -d | sudo tar -C "$dir" -x
}
--
2.34.1
