KVM: x86/vPMU: Introduce a new kvm_pmu_ops->msr_idx_to_pmc callback

Introduce a new callback msr_idx_to_pmc that returns a struct kvm_pmc*,
and change kvm_pmu_is_valid_msr to return ".msr_idx_to_pmc(vcpu, msr) ||
.is_valid_msr(vcpu, msr)" and AMD just returns false from .is_valid_msr.

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Like Xu <like.xu@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c
index 33f6fe1..472b69b 100644 (file)
--- a/arch/x86/kvm/pmu.c
+++ b/arch/x86/kvm/pmu.c
@@ -334,7 +334,8 @@ void kvm_pmu_deliver_pmi(struct kvm_vcpu *vcpu)
 
 bool kvm_pmu_is_valid_msr(struct kvm_vcpu *vcpu, u32 msr)
 {
-       return kvm_x86_ops->pmu_ops->is_valid_msr(vcpu, msr);
+       return kvm_x86_ops->pmu_ops->msr_idx_to_pmc(vcpu, msr) ||
+               kvm_x86_ops->pmu_ops->is_valid_msr(vcpu, msr);
 }
 
 int kvm_pmu_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *data)

diff --git a/arch/x86/kvm/pmu.h b/arch/x86/kvm/pmu.h
index c4a80fe..b253dd5 100644 (file)
--- a/arch/x86/kvm/pmu.h
+++ b/arch/x86/kvm/pmu.h
@@ -27,6 +27,7 @@ struct kvm_pmu_ops {
        struct kvm_pmc *(*pmc_idx_to_pmc)(struct kvm_pmu *pmu, int pmc_idx);
        struct kvm_pmc *(*rdpmc_ecx_to_pmc)(struct kvm_vcpu *vcpu,
                unsigned int idx, u64 *mask);
+       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);
        int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr, u64 *data);

diff --git a/arch/x86/kvm/pmu_amd.c b/arch/x86/kvm/pmu_amd.c
index a4a6d8a..e8609cc 100644 (file)
--- a/arch/x86/kvm/pmu_amd.c
+++ b/arch/x86/kvm/pmu_amd.c
@@ -199,14 +199,20 @@ static struct kvm_pmc *amd_rdpmc_ecx_to_pmc(struct kvm_vcpu *vcpu,
 }
 
 static bool amd_is_valid_msr(struct kvm_vcpu *vcpu, u32 msr)
+{
+       /* All MSRs refer to exactly one PMC, so msr_idx_to_pmc is enough.  */
+       return false;
+}
+
+static struct kvm_pmc *amd_msr_idx_to_pmc(struct kvm_vcpu *vcpu, u32 msr)
 {
        struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
-       int ret = false;
+       struct kvm_pmc *pmc;
 
-       ret = get_gp_pmc_amd(pmu, msr, PMU_TYPE_COUNTER) ||
-               get_gp_pmc_amd(pmu, msr, PMU_TYPE_EVNTSEL);
+       pmc = get_gp_pmc_amd(pmu, msr, PMU_TYPE_COUNTER);
+       pmc = pmc ? pmc : get_gp_pmc_amd(pmu, msr, PMU_TYPE_EVNTSEL);
 
-       return ret;
+       return pmc;
 }
 
 static int amd_pmu_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *data)
@@ -308,6 +314,7 @@ struct kvm_pmu_ops amd_pmu_ops = {
        .pmc_is_enabled = amd_pmc_is_enabled,
        .pmc_idx_to_pmc = amd_pmc_idx_to_pmc,
        .rdpmc_ecx_to_pmc = amd_rdpmc_ecx_to_pmc,
+       .msr_idx_to_pmc = amd_msr_idx_to_pmc,
        .is_valid_rdpmc_ecx = amd_is_valid_rdpmc_ecx,
        .is_valid_msr = amd_is_valid_msr,
        .get_msr = amd_pmu_get_msr,

diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c
index 7a8067e..dcde142 100644 (file)
--- a/arch/x86/kvm/vmx/pmu_intel.c
+++ b/arch/x86/kvm/vmx/pmu_intel.c
@@ -162,6 +162,18 @@ static bool intel_is_valid_msr(struct kvm_vcpu *vcpu, u32 msr)
        return ret;
 }
 
+static struct kvm_pmc *intel_msr_idx_to_pmc(struct kvm_vcpu *vcpu, u32 msr)
+{
+       struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
+       struct kvm_pmc *pmc;
+
+       pmc = get_fixed_pmc(pmu, msr);
+       pmc = pmc ? pmc : get_gp_pmc(pmu, msr, MSR_P6_EVNTSEL0);
+       pmc = pmc ? pmc : get_gp_pmc(pmu, msr, MSR_IA32_PERFCTR0);
+
+       return pmc;
+}
+
 static int intel_pmu_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *data)
 {
        struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
@@ -367,6 +379,7 @@ struct kvm_pmu_ops intel_pmu_ops = {
        .pmc_is_enabled = intel_pmc_is_enabled,
        .pmc_idx_to_pmc = intel_pmc_idx_to_pmc,
        .rdpmc_ecx_to_pmc = intel_rdpmc_ecx_to_pmc,
+       .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,
        .get_msr = intel_pmu_get_msr,