KVM: SVM: Add tracepoint for nested vmrun

This patch adds a dedicated kvm tracepoint for a nested
vmrun.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

3 files changed, 40 insertions, 0 deletions

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 884bffc70c7f..907af3f3a7af 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1726,6 +1726,12 @@ static bool nested_svm_vmrun(struct vcpu_svm *svm)
         /* nested_vmcb is our indicator if nested SVM is activated */
         svm->nested.vmcb = svm->vmcb->save.rax;
 
+        trace_kvm_nested_vmrun(svm->vmcb->save.rip - 3, svm->nested.vmcb,
+                               nested_vmcb->save.rip,
+                               nested_vmcb->control.int_ctl,
+                               nested_vmcb->control.event_inj,
+                               nested_vmcb->control.nested_ctl);
+
         /* Clear internal status */
         kvm_clear_exception_queue(&svm->vcpu);
         kvm_clear_interrupt_queue(&svm->vcpu);
diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
index 0d480e77eacf..b5798e12182a 100644
--- a/arch/x86/kvm/trace.h
+++ b/arch/x86/kvm/trace.h
@@ -349,6 +349,39 @@ TRACE_EVENT(kvm_apic_accept_irq,
                   __entry->coalesced ? " (coalesced)" : "")
 );
 
+/*
+ * Tracepoint for nested VMRUN
+ */
+TRACE_EVENT(kvm_nested_vmrun,
+            TP_PROTO(__u64 rip, __u64 vmcb, __u64 nested_rip, __u32 int_ctl,
+                     __u32 event_inj, bool npt),
+            TP_ARGS(rip, vmcb, nested_rip, int_ctl, event_inj, npt),
+
+        TP_STRUCT__entry(
+                __field(        __u64,          rip             )
+                __field(        __u64,          vmcb            )
+                __field(        __u64,          nested_rip      )
+                __field(        __u32,          int_ctl         )
+                __field(        __u32,          event_inj       )
+                __field(        bool,           npt             )
+        ),
+
+        TP_fast_assign(
+                __entry->rip            = rip;
+                __entry->vmcb           = vmcb;
+                __entry->nested_rip     = nested_rip;
+                __entry->int_ctl        = int_ctl;
+                __entry->event_inj      = event_inj;
+                __entry->npt            = npt;
+        ),
+
+        TP_printk("rip: 0x%016llx vmcb: 0x%016llx nrip: 0x%016llx int_ctl: 0x%08x "
+                  "event_inj: 0x%08x npt: %s\n",
+                __entry->rip, __entry->vmcb, __entry->nested_rip,
+                __entry->int_ctl, __entry->event_inj,
+                __entry->npt ? "on" : "off")
+);
+
 #endif /* _TRACE_KVM_H */
 
 /* This part must be outside protection */
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 4de5bc0a8e86..3ab2f9042dd0 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4984,3 +4984,4 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_inj_virq);
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_page_fault);
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_msr);
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_cr);
+EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmrun);