[v2,28/54] KVM: x86/pmu: Add counter MSR and selector MSR index into struct kvm_pmc

Commit Message

Mingwei Zhang May 6, 2024, 5:29 a.m. UTC

Add the MSR indices for both selector and counter in each kvm_pmc. Giving
convenience to mediated passthrough vPMU in scenarios of querying MSR from
a given pmc. Note that legacy vPMU does not need this because it never
directly accesses PMU MSRs, instead each kvm_pmc is bound to a perf_event.

Signed-off-by: Mingwei Zhang <[e-mail]>
---
 arch/x86/include/asm/kvm_host.h |  2 ++
 arch/x86/kvm/svm/pmu.c          | 13 +++++++++++++
 arch/x86/kvm/vmx/pmu_intel.c    | 13 +++++++++++++
 3 files changed, 28 insertions(+)

Patch

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 19b924c3bd85..8b4ea9bdcc74 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -519,6 +519,8 @@  struct kvm_pmc {
 	 */
 	u64 emulated_counter;
 	u64 eventsel;
+	u64 msr_counter;
+	u64 msr_eventsel;
 	struct perf_event *perf_event;
 	struct kvm_vcpu *vcpu;
 	/*
diff --git a/arch/x86/kvm/svm/pmu.c b/arch/x86/kvm/svm/pmu.c
index 6b471b1ec9b8..447657513729 100644
--- a/arch/x86/kvm/svm/pmu.c
+++ b/arch/x86/kvm/svm/pmu.c
@@ -177,6 +177,7 @@  static void amd_pmu_refresh(struct kvm_vcpu *vcpu)
 {
 	struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
 	union cpuid_0x80000022_ebx ebx;
+	int i;
 
 	pmu->version = 1;
 	if (guest_cpuid_has(vcpu, X86_FEATURE_PERFMON_V2)) {
@@ -210,6 +211,18 @@  static void amd_pmu_refresh(struct kvm_vcpu *vcpu)
 	pmu->counter_bitmask[KVM_PMC_FIXED] = 0;
 	pmu->nr_arch_fixed_counters = 0;
 	bitmap_set(pmu->all_valid_pmc_idx, 0, pmu->nr_arch_gp_counters);
+
+	if (guest_cpuid_has(vcpu, X86_FEATURE_PERFCTR_CORE)) {
+		for (i = 0; i < pmu->nr_arch_gp_counters; i++) {
+			pmu->gp_counters[i].msr_eventsel = MSR_F15H_PERF_CTL0 + 2*i;
+			pmu->gp_counters[i].msr_counter = MSR_F15H_PERF_CTR0 + 2*i;
+		}
+	} else {
+		for (i = 0; i < pmu->nr_arch_gp_counters; i++) {
+			pmu->gp_counters[i].msr_eventsel = MSR_K7_EVNTSEL0 + i;
+			pmu->gp_counters[i].msr_counter = MSR_K7_PERFCTR0 + i;
+		}
+	}
 }
 
 static void amd_pmu_init(struct kvm_vcpu *vcpu)
diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c
index 8e8d1f2aa5e5..7852ba25a240 100644
--- a/arch/x86/kvm/vmx/pmu_intel.c
+++ b/arch/x86/kvm/vmx/pmu_intel.c
@@ -562,6 +562,19 @@  static void intel_pmu_refresh(struct kvm_vcpu *vcpu)
 				~((1ull << pmu->nr_arch_gp_counters) - 1);
 		}
 	}
+
+	for (i = 0; i < pmu->nr_arch_gp_counters; i++) {
+		pmu->gp_counters[i].msr_eventsel = MSR_P6_EVNTSEL0 + i;
+		if (fw_writes_is_enabled(vcpu))
+			pmu->gp_counters[i].msr_counter = MSR_IA32_PMC0 + i;
+		else
+			pmu->gp_counters[i].msr_counter = MSR_IA32_PERFCTR0 + i;
+	}
+
+	for (i = 0; i < pmu->nr_arch_fixed_counters; i++) {
+		pmu->fixed_counters[i].msr_eventsel = MSR_CORE_PERF_FIXED_CTR_CTRL;
+		pmu->fixed_counters[i].msr_counter = MSR_CORE_PERF_FIXED_CTR0 + i;
+	}
 }
 
 static void intel_pmu_init(struct kvm_vcpu *vcpu)