linux-kernel - [RFC PATCH 17/41] KVM: x86/pmu: Implement pmu function for Intel CPU to disable MSR interception

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Date: Fri, 26 Jan 2024 16:54:20 +0800
From: Xiong Zhang <xiong.y.zhang@...ux.intel.com>
To: seanjc@...gle.com,
	pbonzini@...hat.com,
	peterz@...radead.org,
	mizhang@...gle.com,
	kan.liang@...el.com,
	zhenyuw@...ux.intel.com,
	dapeng1.mi@...ux.intel.com,
	jmattson@...gle.com
Cc: kvm@...r.kernel.org,
	linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	zhiyuan.lv@...el.com,
	eranian@...gle.com,
	irogers@...gle.com,
	samantha.alt@...el.com,
	like.xu.linux@...il.com,
	chao.gao@...el.com,
	xiong.y.zhang@...ux.intel.com
Subject: [RFC PATCH 17/41] KVM: x86/pmu: Implement pmu function for Intel CPU to disable MSR interception

From: Mingwei Zhang <mizhang@...gle.com>

Disable PMU MSRs interception, these MSRs are defined in Architectural
Performance Monitoring from SDM, so that guest can access them without
VM-exit.

Signed-off-by: Mingwei Zhang <mizhang@...gle.com>
---
 arch/x86/kvm/vmx/pmu_intel.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c
index 15cc107ed573..7f6cabb2c378 100644
--- a/arch/x86/kvm/vmx/pmu_intel.c
+++ b/arch/x86/kvm/vmx/pmu_intel.c
@@ -794,6 +794,25 @@ void intel_pmu_cross_mapped_check(struct kvm_pmu *pmu)
 	}
 }
 
+void intel_passthrough_pmu_msrs(struct kvm_vcpu *vcpu)
+{
+	int i;
+
+	for (i = 0; i < vcpu_to_pmu(vcpu)->nr_arch_gp_counters; i++) {
+		vmx_set_intercept_for_msr(vcpu, MSR_ARCH_PERFMON_EVENTSEL0 + i, MSR_TYPE_RW, false);
+		vmx_set_intercept_for_msr(vcpu, MSR_IA32_PERFCTR0 + i, MSR_TYPE_RW, false);
+		vmx_set_intercept_for_msr(vcpu, MSR_IA32_PMC0 + i, MSR_TYPE_RW, false);
+	}
+
+	vmx_set_intercept_for_msr(vcpu, MSR_CORE_PERF_FIXED_CTR_CTRL, MSR_TYPE_RW, false);
+	for (i = 0; i < vcpu_to_pmu(vcpu)->nr_arch_fixed_counters; i++)
+		vmx_set_intercept_for_msr(vcpu, MSR_CORE_PERF_FIXED_CTR0 + i, MSR_TYPE_RW, false);
+
+	vmx_set_intercept_for_msr(vcpu, MSR_CORE_PERF_GLOBAL_STATUS, MSR_TYPE_RW, false);
+	vmx_set_intercept_for_msr(vcpu, MSR_CORE_PERF_GLOBAL_CTRL, MSR_TYPE_RW, false);
+	vmx_set_intercept_for_msr(vcpu, MSR_CORE_PERF_GLOBAL_OVF_CTRL, MSR_TYPE_RW, false);
+}
+
 struct kvm_pmu_ops intel_pmu_ops __initdata = {
 	.hw_event_available = intel_hw_event_available,
 	.pmc_idx_to_pmc = intel_pmc_idx_to_pmc,
@@ -808,6 +827,7 @@ struct kvm_pmu_ops intel_pmu_ops __initdata = {
 	.reset = intel_pmu_reset,
 	.deliver_pmi = intel_pmu_deliver_pmi,
 	.cleanup = intel_pmu_cleanup,
+	.passthrough_pmu_msrs = intel_passthrough_pmu_msrs,
 	.EVENTSEL_EVENT = ARCH_PERFMON_EVENTSEL_EVENT,
 	.MAX_NR_GP_COUNTERS = KVM_INTEL_PMC_MAX_GENERIC,
 	.MIN_NR_GP_COUNTERS = 1,
-- 
2.34.1