Messages in this thread | | | Subject | Re: [PATCH] KVM: x86/pmu: Clear anythread deprecated bit when 0xa leaf is unsupported on the SVM | From | Paolo Bonzini <> | Date | Thu, 8 Jul 2021 18:44:11 +0200 |
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On 28/06/21 09:43, Like Xu wrote: > The AMD platform does not support the functions Ah CPUID leaf. The returned > results for this entry should all remain zero just like the native does: > > AMD host: > 0x0000000a 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000 > (uncanny) AMD guest: > 0x0000000a 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00008000 > > Fixes: cadbaa039b99 ("perf/x86/intel: Make anythread filter support conditional") > Signed-off-by: Like Xu <likexu@tencent.com> > --- > arch/x86/kvm/cpuid.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c > index 0edda1fc4fe7..b1808e4fc7d5 100644 > --- a/arch/x86/kvm/cpuid.c > +++ b/arch/x86/kvm/cpuid.c > @@ -765,7 +765,8 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function) > > edx.split.num_counters_fixed = min(cap.num_counters_fixed, MAX_FIXED_COUNTERS); > edx.split.bit_width_fixed = cap.bit_width_fixed; > - edx.split.anythread_deprecated = 1; > + if (cap.version) > + edx.split.anythread_deprecated = 1; > edx.split.reserved1 = 0; > edx.split.reserved2 = 0; > >
Queued, thanks.
Paolo
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