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

[ Upstream commit 4e83d1d616f7b8eca0441569e4af13bb96e07c94 ]

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 c66edf93e4a82a096fa00678074077f42595a2b7..f9054e7ec89ed2db382cb3b389544e358b81d890 100644 (file)
--- a/arch/x86/kvm/vmx/pmu_intel.c
+++ b/arch/x86/kvm/vmx/pmu_intel.c
@@ -104,6 +104,9 @@ 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);
 }