GA Log tracepoint is useful when debugging AVIC performance
issue as it can be used with perf to count the number of times
IOMMU AVIC injects interrupts through the slow-path instead of
directly inject interrupts to the target vcpu.
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
---
arch/x86/kvm/svm.c | 1 +
arch/x86/kvm/trace.h | 18 ++++++++++++++++++
arch/x86/kvm/x86.c | 1 +
3 files changed, 20 insertions(+)
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 24c0b2b..504f2cb 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1208,6 +1208,7 @@ static int avic_ga_log_notifier(u32 ga_tag)
u32 vcpu_id = AVIC_GATAG_TO_VCPUID(ga_tag);
pr_debug("SVM: %s: vm_id=%#x, vcpu_id=%#x\n", __func__, vm_id, vcpu_id);
+ trace_kvm_avic_ga_log(vm_id, vcpu_id);
spin_lock_irqsave(&svm_vm_data_hash_lock, flags);
hash_for_each_possible(svm_vm_data_hash, kvm_svm, hnode, vm_id) {
diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
index f194dd0..023de6c 100644
--- a/arch/x86/kvm/trace.h
+++ b/arch/x86/kvm/trace.h
@@ -1367,6 +1367,24 @@
__entry->vec)
);
+TRACE_EVENT(kvm_avic_ga_log,
+ TP_PROTO(u32 vmid, u32 vcpuid),
+ TP_ARGS(vmid, vcpuid),
+
+ TP_STRUCT__entry(
+ __field(u32, vmid)
+ __field(u32, vcpuid)
+ ),
+
+ TP_fast_assign(
+ __entry->vmid = vmid;
+ __entry->vcpuid = vcpuid;
+ ),
+
+ TP_printk("vmid=%u, vcpuid=%u",
+ __entry->vmid, __entry->vcpuid)
+);
+
TRACE_EVENT(kvm_hv_timer_state,
TP_PROTO(unsigned int vcpu_id, unsigned int hv_timer_in_use),
TP_ARGS(vcpu_id, hv_timer_in_use),
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 5de2006..ef38b82 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -10514,4 +10514,5 @@ u64 kvm_spec_ctrl_valid_bits(struct kvm_vcpu *vcpu)
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_pi_irte_update);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_unaccelerated_access);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_incomplete_ipi);
+EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_ga_log);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_apicv_update_request);
--
1.8.3.1
