From a87d42ae7f5db37fe3a1f93a6fcb28befe66d7fc Mon Sep 17 00:00:00 2001 From: Like Xu Date: Mon, 28 Jun 2021 15:43:54 +0800 Subject: [PATCH] KVM: x86/pmu: Clear anythread deprecated bit when 0xa leaf is unsupported on the SVM [ Upstream commit 7234c362ccb3c2228f06f19f93b132de9cfa7ae4 ] 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 Message-Id: <20210628074354.33848-1-likexu@tencent.com> Signed-off-by: Paolo Bonzini Signed-off-by: Sasha Levin --- 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 7a3fbf3b796e6..41b0dc37720e0 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -684,7 +684,8 @@ 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;