KVM: x86/pmu: Ignore pmu->global_ctrl check if vPMU doesn't support global_ctrl

[ Upstream commit 98defd2e17803263f49548fea930cfc974d505aa ]

MSR_CORE_PERF_GLOBAL_CTRL is introduced as part of Architecture PMU V2,
as indicated by Intel SDM 19.2.2 and the intel_is_valid_msr() function.

So in the absence of global_ctrl support, all PMCs are enabled as AMD does.

Signed-off-by: Like Xu <likexu@tencent.com>
Message-Id: <20220509102204.62389-1-likexu@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c
index cd2d0454f8b02e6beb2bf150eb91d38c1f8bdc87..2cbd5f183ab5240cfb65c04493b3653d81445f3c 100644 (file)
--- a/arch/x86/kvm/vmx/pmu_intel.c
+++ b/arch/x86/kvm/vmx/pmu_intel.c
@@ -98,6 +98,9 @@ static bool intel_pmc_is_enabled(struct kvm_pmc *pmc)
 {
        struct kvm_pmu *pmu = pmc_to_pmu(pmc);
 
+       if (pmu->version < 2)
+               return true;
+
        return test_bit(pmc->idx, (unsigned long *)&pmu->global_ctrl);
 }