linux-kernel - [PATCH bpf-next v1 1/2] selftests/bpf: Update "vmtest.sh" for cross-compile arm64 on x86

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Message-Id: <20240827133959.1269178-2-yikai.lin@vivo.com>
Date: Tue, 27 Aug 2024 21:39:58 +0800
From: Lin Yikai <yikai.lin@...o.com>
To: Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Eduard Zingerman <eddyz87@...il.com>,
	Song Liu <song@...nel.org>,
	Yonghong Song <yonghong.song@...ux.dev>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...nel.org>,
	Stanislav Fomichev <sdf@...ichev.me>,
	Hao Luo <haoluo@...gle.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Mykola Lysenko <mykolal@...com>,
	Shuah Khan <shuah@...nel.org>,
	Nick Terrell <terrelln@...com>,
	bpf@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: opensource.kernel@...o.com,
	yikai.lin@...o.com
Subject: [PATCH bpf-next v1 1/2] selftests/bpf: Update "vmtest.sh" for cross-compile arm64 on x86_64 host.

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@...o.com>
---
 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