[PATCH v1 06/11] KVM: x86/pmu: Implement is_pebs_via_ds_supported pmu ops

[Luwei Kang]

PEBS virtualization enabling in KVM guest via DS is only supported on
Icelake server. This patch introduce a new pmu ops is_pebs_via_ds_supported
to check if PEBS feature can be supported in KVM guest.

Originally-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Signed-off-by: Luwei Kang <luwei.kang@xxxxxxxxx>
Co-developed-by: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
Signed-off-by: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
Co-developed-by: Like Xu <like.xu@xxxxxxxxxxxxxxx>
Signed-off-by: Like Xu <like.xu@xxxxxxxxxxxxxxx>
---
 arch/x86/kvm/pmu.h           |  1 +
 arch/x86/kvm/vmx/pmu_intel.c | 18 ++++++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/arch/x86/kvm/pmu.h b/arch/x86/kvm/pmu.h
index 1333298..476780b 100644
--- a/arch/x86/kvm/pmu.h
+++ b/arch/x86/kvm/pmu.h
@@ -32,6 +32,7 @@ struct kvm_pmu_ops {
 	struct kvm_pmc *(*msr_idx_to_pmc)(struct kvm_vcpu *vcpu, u32 msr);
 	int (*is_valid_rdpmc_ecx)(struct kvm_vcpu *vcpu, unsigned int idx);
 	bool (*is_valid_msr)(struct kvm_vcpu *vcpu, u32 msr);
+	bool (*is_pebs_via_ds_supported)(void);
 	int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr, u64 *data);
 	int (*set_msr)(struct kvm_vcpu *vcpu, struct msr_data *msr_info);
 	void (*refresh)(struct kvm_vcpu *vcpu);
diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c
index ebadc33..a67bd34 100644
--- a/arch/x86/kvm/vmx/pmu_intel.c
+++ b/arch/x86/kvm/vmx/pmu_intel.c
@@ -12,6 +12,7 @@
 #include <linux/kvm_host.h>
 #include <linux/perf_event.h>
 #include <asm/perf_event.h>
+#include <asm/intel-family.h>
 #include "x86.h"
 #include "cpuid.h"
 #include "lapic.h"
@@ -172,6 +173,22 @@ static bool intel_is_valid_msr(struct kvm_vcpu *vcpu, u32 msr)
 	return ret;
 }
 
+static bool intel_is_pebs_via_ds_supported(void)
+{
+	if (!boot_cpu_has(X86_FEATURE_PEBS))
+		return false;
+
+	switch (boot_cpu_data.x86_model) {
+	case INTEL_FAM6_ICELAKE_D:
+	case INTEL_FAM6_ICELAKE_X:
+		break;
+	default:
+		return false;
+	}
+
+	return true;
+}
+
 static struct kvm_pmc *intel_msr_idx_to_pmc(struct kvm_vcpu *vcpu, u32 msr)
 {
 	struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
@@ -401,6 +418,7 @@ struct kvm_pmu_ops intel_pmu_ops = {
 	.msr_idx_to_pmc = intel_msr_idx_to_pmc,
 	.is_valid_rdpmc_ecx = intel_is_valid_rdpmc_ecx,
 	.is_valid_msr = intel_is_valid_msr,
+	.is_pebs_via_ds_supported = intel_is_pebs_via_ds_supported,
 	.get_msr = intel_pmu_get_msr,
 	.set_msr = intel_pmu_set_msr,
 	.refresh = intel_pmu_refresh,
-- 
1.8.3.1