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

Sean Christopherson
2024-10-31T17:07:51Z

On Thu, Oct 31, 2024, Vitaly Kuznetsov wrote:
> > diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
> > index 156fbfae940f..5fa282643cff 100644
> > --- a/tools/testing/selftests/kvm/Makefile
> > +++ b/tools/testing/selftests/kvm/Makefile
> > @@ -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)
>
> With this test, the outer "ifeq ($(ARCH),x86)" check is not really
> needed anymore I guess?

Yeah, but at this point in the v6.12 cycle, I want to do the absolute bare minimum.
In 6.13, after the AVX support lands, I think we can/should revert this restriction,
i.e. it's a short-term wart.