From: Like Xu <likexu@xxxxxxxxxxx> If the user space sets reserved bits when restoring the MSR_CORE_ PERF_GLOBAL_STATUS register, these bits will be accidentally returned when the guest runs a read access to this register, and cannot be cleared up inside the guest, which makes the guest's PMI handler very confused. Signed-off-by: Like Xu <likexu@xxxxxxxxxxx> --- arch/x86/kvm/vmx/pmu_intel.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c index 904f832fc55d..aaea25d2cae8 100644 --- a/arch/x86/kvm/vmx/pmu_intel.c +++ b/arch/x86/kvm/vmx/pmu_intel.c @@ -397,7 +397,7 @@ static int intel_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) reprogram_fixed_counters(pmu, data); break; case MSR_CORE_PERF_GLOBAL_STATUS: - if (!msr_info->host_initiated) + if (!msr_info->host_initiated || (data & pmu->global_ovf_ctrl_mask)) return 1; /* RO MSR */ pmu->global_status = data; -- 2.39.1
