From: Sandipan Das <sandipan.das@xxxxxxx>
Implement the AMD-specific callback for passthrough PMU that increments
counters for cases such as instruction emulation. A PMI will also be
injected if the increment results in an overflow.
Signed-off-by: Sandipan Das <sandipan.das@xxxxxxx>
Signed-off-by: Mingwei Zhang <mizhang@xxxxxxxxxx>
---
arch/x86/kvm/svm/pmu.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/arch/x86/kvm/svm/pmu.c b/arch/x86/kvm/svm/pmu.c
index 9f3e910ee453..70465903ef1e 100644
--- a/arch/x86/kvm/svm/pmu.c
+++ b/arch/x86/kvm/svm/pmu.c
@@ -346,6 +346,17 @@ static void amd_restore_pmu_context(struct kvm_vcpu *vcpu)
wrmsrl(MSR_AMD64_PERF_CNTR_GLOBAL_CTL, pmu->global_ctrl);
}
+static bool amd_incr_counter(struct kvm_pmc *pmc)
+{
+ pmc->counter += 1;
+ pmc->counter &= pmc_bitmask(pmc);
+
+ if (!pmc->counter)
+ return true;
+
+ return false;
+}
+
struct kvm_pmu_ops amd_pmu_ops __initdata = {
.rdpmc_ecx_to_pmc = amd_rdpmc_ecx_to_pmc,
.msr_idx_to_pmc = amd_msr_idx_to_pmc,
@@ -359,6 +370,7 @@ struct kvm_pmu_ops amd_pmu_ops __initdata = {
.passthrough_pmu_msrs = amd_passthrough_pmu_msrs,
.save_pmu_context = amd_save_pmu_context,
.restore_pmu_context = amd_restore_pmu_context,
+ .incr_counter = amd_incr_counter,
.EVENTSEL_EVENT = AMD64_EVENTSEL_EVENT,
.MAX_NR_GP_COUNTERS = KVM_AMD_PMC_MAX_GENERIC,
.MIN_NR_GP_COUNTERS = AMD64_NUM_COUNTERS,
--
2.46.0.rc1.232.g9752f9e123-goog
