Commit 979956bc authored Oct 30, 2024 by Sean Christopherson

KVM: selftests: Don't force -march=x86-64-v2 if it's unsupported



Force -march=x86-64-v2 to avoid SSE/AVX instructions if and only if the
uarch definition is supported by the compiler, e.g. gcc 7.5 only supports
x86-64.

Fixes: 9a400068 ("KVM: selftests: x86: Avoid using SSE/AVX instructions")
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-and-tested-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Link: https://lore.kernel.org/r/20241031045333.1209195-1-seanjc@google.com


Signed-off-by: Sean Christopherson <seanjc@google.com>

parent 5b188cc4

tools/testing/selftests/kvm/Makefile

+2 −0

Original line number	Diff line number	Diff line
		@@ -249,8 +249,10 @@ ifeq ($(ARCH),s390)
		CFLAGS += -march=z10
		endif
		ifeq ($(ARCH),x86)
		ifeq ($(shell echo "void foo(void) { }" \| $(CC) -march=x86-64-v2 -x c - -c -o /dev/null 2>/dev/null; echo "$$?"),0)
		CFLAGS += -march=x86-64-v2
		endif
		endif
		ifeq ($(ARCH),arm64)
		tools_dir := $(top_srcdir)/tools
		arm64_tools_dir := $(tools_dir)/arch/arm64/tools/