From: Like Xu <likexu@xxxxxxxxxxx> A sanity check is added to limit the number of AMD guest counters, which help avoid a situation if KVM only has access to 4 counters, but user space sets guest X86_FEATURE_PERFCTR_CORE anyways. Suggested-by: Sean Christopherson <seanjc@xxxxxxxxxx> Signed-off-by: Like Xu <likexu@xxxxxxxxxxx> --- arch/x86/kvm/svm/pmu.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/kvm/svm/pmu.c b/arch/x86/kvm/svm/pmu.c index 70143275e0a7..825b9cc26ae5 100644 --- a/arch/x86/kvm/svm/pmu.c +++ b/arch/x86/kvm/svm/pmu.c @@ -170,6 +170,9 @@ static void amd_pmu_refresh(struct kvm_vcpu *vcpu) else pmu->nr_arch_gp_counters = AMD64_NUM_COUNTERS; + pmu->nr_arch_gp_counters = min_t(unsigned int, pmu->nr_arch_gp_counters, + kvm_pmu_cap.num_counters_gp); + pmu->counter_bitmask[KVM_PMC_GP] = ((u64)1 << 48) - 1; pmu->reserved_bits = 0xfffffff000280000ull; pmu->raw_event_mask = AMD64_RAW_EVENT_MASK; -- 2.40.0
