From: Like Xu <like.xu.linux@gmail.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Jim Mattson <jmattson@google.com>,
Sean Christopherson <seanjc@google.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Joerg Roedel <joro@8bytes.org>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 1/3] KVM: x86/pmu: Ignore pmu->global_ctrl check if vPMU doesn't support global_ctrl
Date: Mon, 9 May 2022 18:22:02 +0800 [thread overview]
Message-ID: <20220509102204.62389-1-likexu@tencent.com> (raw)
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 --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);
}
--
2.36.1
next reply other threads:[~2022-05-09 10:23 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-09 10:22 Like Xu [this message]
2022-05-09 10:22 ` [PATCH 2/3] KVM: x86/pmu: Don't pre-set the pmu->global_ctrl when refreshing Like Xu
2022-05-10 4:37 ` [PATCH V2 " Like Xu
2022-05-10 4:44 ` [PATCH v2] " Like Xu
2022-05-20 14:25 ` Paolo Bonzini
2022-05-15 9:22 ` [KVM] db16e9b28b: kvm-unit-tests.pmu.fail kernel test robot
2022-05-15 9:25 ` Like Xu
2022-05-24 13:36 ` Oliver Sang
2022-05-09 10:22 ` [PATCH 3/3] KVM: x86/pmu: Drop redundant-clumsy-asymmetric PERFCTR_CORE MSRs handling Like Xu
2022-05-20 14:32 ` Paolo Bonzini
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