diff mbox series

[1/3] KVM: x86/pmu: Ignore pmu->global_ctrl check if vPMU doesn't support global_ctrl

Message ID 20220509102204.62389-1-likexu@tencent.com (mailing list archive)
State New, archived
Headers show
Series [1/3] KVM: x86/pmu: Ignore pmu->global_ctrl check if vPMU doesn't support global_ctrl | expand

Commit Message

Like Xu May 9, 2022, 10:22 a.m. UTC 
From: Like Xu <likexu@tencent.com>

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>
---
 arch/x86/kvm/vmx/pmu_intel.c | 3 +++
 1 file changed, 3 insertions(+)
diff mbox series

Patch

diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c
index b82b6709d7a8..cff03baf8921 100644
--- 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);
 }