linux-kernel - [PATCH] KVM: x86/vPMU: reset pmc->counter to 0 for pmu fixed

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Message-Id: <20190717025118.16783-1-like.xu@linux.intel.com>
Date:   Wed, 17 Jul 2019 10:51:18 +0800
From:   Like Xu <like.xu@...ux.intel.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     like.xu@...ux.intel.com, wehuang@...hat.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] KVM: x86/vPMU: reset pmc->counter to 0 for pmu fixed_counters

To avoid semantic inconsistency, the fixed_counters in Intel vPMU
need to be reset to 0 in intel_pmu_reset() as gp_counters does.

Signed-off-by: Like Xu <like.xu@...ux.intel.com>
---
 arch/x86/kvm/vmx/pmu_intel.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c
index 68d231d49c7a..4dea0e0e7e39 100644
--- a/arch/x86/kvm/vmx/pmu_intel.c
+++ b/arch/x86/kvm/vmx/pmu_intel.c
@@ -337,17 +337,22 @@ static void intel_pmu_init(struct kvm_vcpu *vcpu)
 static void intel_pmu_reset(struct kvm_vcpu *vcpu)
 {
 	struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
+	struct kvm_pmc *pmc = NULL;
 	int i;
 
 	for (i = 0; i < INTEL_PMC_MAX_GENERIC; i++) {
-		struct kvm_pmc *pmc = &pmu->gp_counters[i];
+		pmc = &pmu->gp_counters[i];
 
 		pmc_stop_counter(pmc);
 		pmc->counter = pmc->eventsel = 0;
 	}
 
-	for (i = 0; i < INTEL_PMC_MAX_FIXED; i++)
-		pmc_stop_counter(&pmu->fixed_counters[i]);
+	for (i = 0; i < INTEL_PMC_MAX_FIXED; i++) {
+		pmc = &pmu->fixed_counters[i];
+
+		pmc_stop_counter(pmc);
+		pmc->counter = 0;
+	}
 
 	pmu->fixed_ctr_ctrl = pmu->global_ctrl = pmu->global_status =
 		pmu->global_ovf_ctrl = 0;
-- 
2.21.0