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Subject[PATCH v6 12/12] KVM/VMX/vPMU: support to report GLOBAL_STATUS_LBRS_FROZEN
Date
Arch v4 supports streamlined Freeze_LBR_on_PMI. According to the SDM,
the LBR_FRZ bit is set to global status when debugctl.freeze_lbr_on_pmi
has been set and a PMI is generated. The CTR_FRZ bit is set when
debugctl.freeze_perfmon_on_pmi is set and a PMI is generated.

Signed-off-by: Wei Wang <wei.w.wang@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Kan Liang <kan.liang@intel.com>
---
arch/x86/kvm/pmu.c | 11 +++++++++--
arch/x86/kvm/pmu.h | 1 +
arch/x86/kvm/vmx/pmu_intel.c | 19 +++++++++++++++++++
3 files changed, 29 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c
index 1e313f3..f5f1f46 100644
--- a/arch/x86/kvm/pmu.c
+++ b/arch/x86/kvm/pmu.c
@@ -55,6 +55,13 @@ static void kvm_pmi_trigger_fn(struct irq_work *irq_work)
kvm_pmu_deliver_pmi(vcpu);
}

+static void kvm_perf_set_global_status(struct kvm_pmu *pmu, u8 idx)
+{
+ __set_bit(idx, (unsigned long *)&pmu->global_status);
+ if (kvm_x86_ops->pmu_ops->set_global_status)
+ kvm_x86_ops->pmu_ops->set_global_status(pmu, idx);
+}
+
static void kvm_perf_overflow(struct perf_event *perf_event,
struct perf_sample_data *data,
struct pt_regs *regs)
@@ -64,7 +71,7 @@ static void kvm_perf_overflow(struct perf_event *perf_event,

if (!test_and_set_bit(pmc->idx,
(unsigned long *)&pmu->reprogram_pmi)) {
- __set_bit(pmc->idx, (unsigned long *)&pmu->global_status);
+ kvm_perf_set_global_status(pmu, pmc->idx);
kvm_make_request(KVM_REQ_PMU, pmc->vcpu);
}
}
@@ -78,7 +85,7 @@ static void kvm_perf_overflow_intr(struct perf_event *perf_event,

if (!test_and_set_bit(pmc->idx,
(unsigned long *)&pmu->reprogram_pmi)) {
- __set_bit(pmc->idx, (unsigned long *)&pmu->global_status);
+ kvm_perf_set_global_status(pmu, pmc->idx);
kvm_make_request(KVM_REQ_PMU, pmc->vcpu);

/*
diff --git a/arch/x86/kvm/pmu.h b/arch/x86/kvm/pmu.h
index cadf91a..408ddc2 100644
--- a/arch/x86/kvm/pmu.h
+++ b/arch/x86/kvm/pmu.h
@@ -24,6 +24,7 @@ struct kvm_pmu_ops {
u8 unit_mask);
unsigned (*find_fixed_event)(int idx);
bool (*pmc_is_enabled)(struct kvm_pmc *pmc);
+ void (*set_global_status)(struct kvm_pmu *pmu, u8 idx);
struct kvm_pmc *(*pmc_idx_to_pmc)(struct kvm_pmu *pmu, int pmc_idx);
struct kvm_pmc *(*msr_idx_to_pmc)(struct kvm_vcpu *vcpu, unsigned idx,
u64 *mask);
diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c
index c60f564..62e7bcd 100644
--- a/arch/x86/kvm/vmx/pmu_intel.c
+++ b/arch/x86/kvm/vmx/pmu_intel.c
@@ -421,6 +421,24 @@ static bool intel_pmu_access_lbr_msr(struct kvm_vcpu *vcpu,
return ret;
}

+static void intel_pmu_set_global_status(struct kvm_pmu *pmu, u8 idx)
+{
+ u64 guest_debugctl;
+
+ if (pmu->version >= 4) {
+ guest_debugctl = vmcs_read64(GUEST_IA32_DEBUGCTL);
+
+ if ((guest_debugctl & GLOBAL_STATUS_LBRS_FROZEN) ==
+ DEBUGCTLMSR_FREEZE_LBRS_ON_PMI)
+ __set_bit(GLOBAL_STATUS_LBRS_FROZEN,
+ (unsigned long *)&pmu->global_status);
+ if ((guest_debugctl & GLOBAL_STATUS_LBRS_FROZEN) ==
+ DEBUGCTLMSR_FREEZE_PERFMON_ON_PMI)
+ __set_bit(GLOBAL_STATUS_COUNTERS_FROZEN,
+ (unsigned long *)&pmu->global_status);
+ }
+}
+
static int intel_pmu_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
{
struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
@@ -719,6 +737,7 @@ void intel_pmu_disable_save_guest_lbr(struct kvm_vcpu *vcpu)
struct kvm_pmu_ops intel_pmu_ops = {
.find_arch_event = intel_find_arch_event,
.find_fixed_event = intel_find_fixed_event,
+ .set_global_status = intel_pmu_set_global_status,
.pmc_is_enabled = intel_pmc_is_enabled,
.pmc_idx_to_pmc = intel_pmc_idx_to_pmc,
.msr_idx_to_pmc = intel_msr_idx_to_pmc,
--
2.7.4
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