[PATCH 41/42] KVM: SVM: Add tracepoint for nested #vmexit

Avi Kivity
2009-11-16T12:20:47Z

From: Joerg Roedel <joerg.roedel@amd.com>

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>
---
arch/x86/kvm/svm.c | 6 ++++++
arch/x86/kvm/trace.h | 36 ++++++++++++++++++++++++++++++++++++
arch/x86/kvm/x86.c | 1 +
3 files changed, 43 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 907af3f..edf6e8b 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 b5798e1..a7eb629 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 3ab2f90..192d58e 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);
--
1.6.5.2