linux-kernel - [PATCH 6/9] KVM: SVM: Add tracepoint for #vmexit because intr pending

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Date:	Fri, 9 Oct 2009 16:08:30 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	Avi Kivity <avi@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>
CC:	Alexander Graf <agraf@...e.de>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, Joerg Roedel <joerg.roedel@....com>
Subject: [PATCH 6/9] KVM: SVM: Add tracepoint for #vmexit because intr pending

This patch adds a special tracepoint for the event that a
nested #vmexit is injected because kvm wants to inject an
interrupt into the guest.

Signed-off-by: Joerg Roedel <joerg.roedel@....com>
---
 arch/x86/kvm/svm.c   |    2 +-
 arch/x86/kvm/trace.h |   18 ++++++++++++++++++
 arch/x86/kvm/x86.c   |    1 +
 3 files changed, 20 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 369eeb8..78a391c 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1390,7 +1390,7 @@ static inline int nested_svm_intr(struct vcpu_svm *svm)
 		 * the #vmexit here.
 		 */
 		svm->nested.exit_required = true;
-		nsvm_printk("VMexit -> INTR\n");
+		trace_kvm_nested_intr_vmexit(svm->vmcb->save.rip);
 		return 1;
 	}
 
diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
index 4d6bb5e..3cc8f44 100644
--- a/arch/x86/kvm/trace.h
+++ b/arch/x86/kvm/trace.h
@@ -451,6 +451,24 @@ TRACE_EVENT(kvm_nested_vmexit_inject,
 		__entry->exit_info1, __entry->exit_info2,
 		__entry->exit_int_info, __entry->exit_int_info_err)
 );
+
+/*
+ * Tracepoint for nested #vmexit because of interrupt pending
+ */
+TRACE_EVENT(kvm_nested_intr_vmexit,
+	    TP_PROTO(__u64 rip),
+	    TP_ARGS(rip),
+
+	TP_STRUCT__entry(
+		__field(	__u64,	rip	)
+	),
+
+	TP_fast_assign(
+		__entry->rip	=	rip
+	),
+
+	TP_printk("rip: 0x%016llx\n", __entry->rip)
+);
 #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 4f90d45..877f910 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4983,3 +4983,4 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_cr);
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmrun);
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit);
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit_inject);
+EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intr_vmexit);
-- 
1.6.4.3


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