[PATCH V1 4/4] KVM: x86/vPMU: Enable PMU handling for AMD PERFCTRn and EVNTSELn MSRs

[Wei Huang <wei@redhat.com>]

This patch enables PMU handling (read/write) for AMD performance
counters, whic include PERFCTR[0..3] and EVNTSEL[0..3].

Signed-off-by: Wei Huang <wei@redhat.com>
---
 arch/x86/kvm/x86.c | 34 ++++++++++++++++++----------------
 1 file changed, 18 insertions(+), 16 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index e4ed76e..fb445d7 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2226,24 +2226,22 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
 	 * which we perfectly emulate ;-). Any other value should be at least
 	 * reported, some guests depend on them.
 	 */
+	case MSR_K7_PERFCTR0:
+	case MSR_K7_PERFCTR1:
+	case MSR_K7_PERFCTR2:
+	case MSR_K7_PERFCTR3:
+		pr = true;
 	case MSR_K7_EVNTSEL0:
 	case MSR_K7_EVNTSEL1:
 	case MSR_K7_EVNTSEL2:
 	case MSR_K7_EVNTSEL3:
-		if (data != 0)
-			vcpu_unimpl(vcpu, "unimplemented perfctr wrmsr: "
+		if (kvm_pmu_ops->is_pmu_msr(vcpu, msr))
+			return kvm_pmu_ops->pmu_set_msr(vcpu, msr_info);
+
+		if (pr || data != 0)
+			vcpu_unimpl(vcpu, "disabled perfctr wrmsr: "
 				    "0x%x data 0x%llx\n", msr, data);
 		break;
-	/* at least RHEL 4 unconditionally writes to the perfctr registers,
-	 * so we ignore writes to make it happy.
-	 */
-	case MSR_K7_PERFCTR0:
-	case MSR_K7_PERFCTR1:
-	case MSR_K7_PERFCTR2:
-	case MSR_K7_PERFCTR3:
-		vcpu_unimpl(vcpu, "unimplemented perfctr wrmsr: "
-			    "0x%x data 0x%llx\n", msr, data);
-		break;
 	case MSR_P6_PERFCTR0:
 	case MSR_P6_PERFCTR1:
 		pr = true;
@@ -2470,6 +2468,12 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
 	case MSR_K8_SYSCFG:
 	case MSR_K7_HWCR:
 	case MSR_VM_HSAVE_PA:
+	case MSR_K8_INT_PENDING_MSG:
+	case MSR_AMD64_NB_CFG:
+	case MSR_FAM10H_MMIO_CONF_BASE:
+	case MSR_AMD64_BU_CFG2:
+		data = 0;
+		break;
 	case MSR_K7_EVNTSEL0:
 	case MSR_K7_EVNTSEL1:
 	case MSR_K7_EVNTSEL2:
@@ -2478,10 +2482,8 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
 	case MSR_K7_PERFCTR1:
 	case MSR_K7_PERFCTR2:
 	case MSR_K7_PERFCTR3:
-	case MSR_K8_INT_PENDING_MSG:
-	case MSR_AMD64_NB_CFG:
-	case MSR_FAM10H_MMIO_CONF_BASE:
-	case MSR_AMD64_BU_CFG2:
+		if (kvm_pmu_ops->is_pmu_msr(vcpu, msr))
+			return kvm_pmu_ops->pmu_get_msr(vcpu, msr, pdata);
 		data = 0;
 		break;
 	case MSR_P6_PERFCTR0:
-- 
1.8.3.1