commit ab56f8e62dafe4c9bec9fc236937c9884bd9966d
author Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> Thu Mar 12 05:39:28 2020 -0500
committer Paolo Bonzini <pbonzini@redhat.com> Mon Mar 16 17:58:56 2020 +0100
tree f53ecb06f2b89df2f127028342ff2abbd3250b1f
parent 3ac40c404c60f20dd07920810b1195125f193e1e

kvm: svm: Introduce GA Log tracepoint for AVIC

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@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/svm.c

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index c923ad1..7c9ddd6 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1232,6 +1232,7 @@ 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) {

arch/x86/kvm/trace.h

diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
index f5b8814..6c4d9b4 100644
--- a/arch/x86/kvm/trace.h
+++ b/arch/x86/kvm/trace.h
@@ -1367,6 +1367,24 @@ TRACE_EVENT(kvm_avic_unaccelerated_access,
 		  __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),

arch/x86/kvm/x86.c

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index c673241..a7cb852 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -10562,4 +10562,5 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_pml_full);
 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);