linux-kernel - [RFC PATCH v4 2/2] debug: add tracepoint for flush_rap_on

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Message-ID: <20250402082833.9835-3-amit@kernel.org>
Date: Wed,  2 Apr 2025 10:28:33 +0200
From: Amit Shah <amit@...nel.org>
To: linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org,
	x86@...nel.org,
	linux-doc@...r.kernel.org
Cc: amit.shah@....com,
	thomas.lendacky@....com,
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Subject: [RFC PATCH v4 2/2] debug: add tracepoint for flush_rap_on_vmrun

From: Amit Shah <amit.shah@....com>

---
 arch/x86/kvm/svm/svm.c |  4 +++-
 arch/x86/kvm/trace.h   | 16 ++++++++++++++++
 arch/x86/kvm/x86.c     |  1 +
 3 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index b5de6341080b..c47d4dfcc1d4 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -3607,8 +3607,10 @@ static int svm_handle_exit(struct kvm_vcpu *vcpu, fastpath_t exit_fastpath)
 
 		trace_kvm_nested_vmexit(vcpu, KVM_ISA_SVM);
 
-		if (vmcb_is_extended_rap(svm->vmcb01.ptr))
+		if (vmcb_is_extended_rap(svm->vmcb01.ptr)) {
 			vmcb_flush_guest_rap(svm->vmcb01.ptr);
+			trace_kvm_svm_eraps_flush_rap(svm->vmcb01.ptr);
+		}
 
 		vmexit = nested_svm_exit_special(svm);
 
diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
index ccda95e53f62..059dfc744a22 100644
--- a/arch/x86/kvm/trace.h
+++ b/arch/x86/kvm/trace.h
@@ -346,6 +346,22 @@ TRACE_EVENT(name,							     \
  */
 TRACE_EVENT_KVM_EXIT(kvm_exit);
 
+TRACE_EVENT(kvm_svm_eraps_flush_rap,					     \
+	TP_PROTO(struct vmcb *vmcb),					     \
+	TP_ARGS(vmcb),							     \
+									     \
+	TP_STRUCT__entry(						     \
+		__field( struct vmcb *,		vmcb		)	     \
+	),								     \
+									     \
+	TP_fast_assign(							     \
+		__entry->vmcb	= vmcb; 				     \
+	),								     \
+									     \
+	TP_printk("vmcb: 0x%p",						     \
+		  __entry->vmcb)					     \
+)
+
 /*
  * Tracepoint for kvm interrupt injection:
  */
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index c841817a914a..414a0e6c9c4b 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -14024,6 +14024,7 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_vmgexit_exit);
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_vmgexit_msr_protocol_enter);
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_vmgexit_msr_protocol_exit);
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_rmp_fault);
+EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_svm_eraps_flush_rap);
 
 static int __init kvm_x86_init(void)
 {
-- 
2.49.0