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From: Xiong Zhang <xiong.y.zhang@linux.intel.com>
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Subject: [RFC PATCH 27/41] KVM: x86/pmu: Clear PERF_METRICS MSR for guest
Date: Fri, 26 Jan 2024 16:54:30 +0800
Message-Id: <20240126085444.324918-28-xiong.y.zhang@linux.intel.com>
In-Reply-To: <20240126085444.324918-1-xiong.y.zhang@linux.intel.com>
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From: Dapeng Mi <dapeng1.mi@linux.intel.com>

Since perf topdown metrics feature is not supported yet, clear
PERF_METRICS MSR for guest.

Signed-off-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
---
 arch/x86/kvm/vmx/pmu_intel.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c
index 4b4da7f17895..ad0434646a29 100644
--- a/arch/x86/kvm/vmx/pmu_intel.c
+++ b/arch/x86/kvm/vmx/pmu_intel.c
@@ -916,6 +916,10 @@ static void intel_restore_pmu_context(struct kvm_vcpu *vcpu)
 	 */
 	for (i = pmu->nr_arch_fixed_counters; i < kvm_pmu_cap.num_counters_fixed; i++)
 		wrmsrl(MSR_CORE_PERF_FIXED_CTR0 + i, 0);
+
+	/* Clear PERF_METRICS MSR since guest topdown metrics is not supported yet. */
+	if (kvm_caps.host_perf_cap & PMU_CAP_PERF_METRICS)
+		wrmsrl(MSR_PERF_METRICS, 0);
 }
 
 struct kvm_pmu_ops intel_pmu_ops __initdata = {
-- 
2.34.1