KVM: SVM: Add tracepoint for nested #vmexit

This patch adds a tracepoint for every #vmexit we get from a
nested guest.

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

3 files changed, 43 insertions, 0 deletions

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 907af3f3a7a..edf6e8b2b84 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -2366,6 +2366,12 @@ static int handle_exit(struct kvm_vcpu *vcpu)
         if (is_nested(svm)) {
                 int vmexit;
 
+                trace_kvm_nested_vmexit(svm->vmcb->save.rip, exit_code,
+                                        svm->vmcb->control.exit_info_1,
+                                        svm->vmcb->control.exit_info_2,
+                                        svm->vmcb->control.exit_int_info,
+                                        svm->vmcb->control.exit_int_info_err);
+
                 nsvm_printk("nested handle_exit: 0x%x | 0x%lx | 0x%lx | 0x%lx\n",
                             exit_code, svm->vmcb->control.exit_info_1,
                             svm->vmcb->control.exit_info_2, svm->vmcb->save.rip);
diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
index b5798e12182..a7eb6299a26 100644
--- a/arch/x86/kvm/trace.h
+++ b/arch/x86/kvm/trace.h
@@ -382,6 +382,42 @@ TRACE_EVENT(kvm_nested_vmrun,
                 __entry->npt ? "on" : "off")
 );
 
+/*
+ * Tracepoint for #VMEXIT while nested
+ */
+TRACE_EVENT(kvm_nested_vmexit,
+            TP_PROTO(__u64 rip, __u32 exit_code,
+                     __u64 exit_info1, __u64 exit_info2,
+                     __u32 exit_int_info, __u32 exit_int_info_err),
+            TP_ARGS(rip, exit_code, exit_info1, exit_info2,
+                    exit_int_info, exit_int_info_err),
+
+        TP_STRUCT__entry(
+                __field(        __u64,          rip                     )
+                __field(        __u32,          exit_code               )
+                __field(        __u64,          exit_info1              )
+                __field(        __u64,          exit_info2              )
+                __field(        __u32,          exit_int_info           )
+                __field(        __u32,          exit_int_info_err       )
+        ),
+
+        TP_fast_assign(
+                __entry->rip                    = rip;
+                __entry->exit_code              = exit_code;
+                __entry->exit_info1             = exit_info1;
+                __entry->exit_info2             = exit_info2;
+                __entry->exit_int_info          = exit_int_info;
+                __entry->exit_int_info_err      = exit_int_info_err;
+        ),
+        TP_printk("rip: 0x%016llx reason: %s ext_inf1: 0x%016llx "
+                  "ext_inf2: 0x%016llx ext_int: 0x%08x ext_int_err: 0x%08x\n",
+                  __entry->rip,
+                  ftrace_print_symbols_seq(p, __entry->exit_code,
+                                           kvm_x86_ops->exit_reasons_str),
+                  __entry->exit_info1, __entry->exit_info2,
+                  __entry->exit_int_info, __entry->exit_int_info_err)
+);
+
 #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 3ab2f9042dd..192d58efc6d 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4985,3 +4985,4 @@ 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);
+EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit);