KVM: x86: Add support of clear Trace_ToPA_PMI status

Let guests clear the Intel PT ToPA PMI status (bit 55 of
MSR_CORE_PERF_GLOBAL_OVF_CTRL).

Signed-off-by: Luwei Kang <luwei.kang@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c
index 5ab4a364348e..f8502c376b37 100644
--- a/arch/x86/kvm/vmx/pmu_intel.c
+++ b/arch/x86/kvm/vmx/pmu_intel.c
@@ -227,7 +227,7 @@ static int intel_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
                 }
                 break;
         case MSR_CORE_PERF_GLOBAL_OVF_CTRL:
-                if (!(data & (pmu->global_ctrl_mask & ~(3ull<<62)))) {
+                if (!(data & pmu->global_ovf_ctrl_mask)) {
                         if (!msr_info->host_initiated)
                                 pmu->global_status &= ~data;
                         pmu->global_ovf_ctrl = data;
@@ -297,6 +297,12 @@ static void intel_pmu_refresh(struct kvm_vcpu *vcpu)
         pmu->global_ctrl = ((1ull << pmu->nr_arch_gp_counters) - 1) |
                 (((1ull << pmu->nr_arch_fixed_counters) - 1) << INTEL_PMC_IDX_FIXED);
         pmu->global_ctrl_mask = ~pmu->global_ctrl;
+        pmu->global_ovf_ctrl_mask = pmu->global_ctrl_mask
+                        & ~(MSR_CORE_PERF_GLOBAL_OVF_CTRL_OVF_BUF |
+                            MSR_CORE_PERF_GLOBAL_OVF_CTRL_COND_CHGD);
+        if (kvm_x86_ops->pt_supported())
+                pmu->global_ovf_ctrl_mask &=
+                                ~MSR_CORE_PERF_GLOBAL_OVF_CTRL_TRACE_TOPA_PMI;
 
         entry = kvm_find_cpuid_entry(vcpu, 7, 0);
         if (entry &&