linux-kernel - [PATCH] LoongArch: KVM: Add tracepoints for CPUCFG and CSR emulation exits

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Message-Id: <20250702105922.1035771-1-wheatfox17@icloud.com>
Date: Wed,  2 Jul 2025 18:59:22 +0800
From: Yulong Han <wheatfox17@...oud.com>
To: chenhuacai@...nel.org
Cc: kernel@...0n.name,
	zhaotianrui@...ngson.cn,
	maobibo@...ngson.cn,
	kvm@...r.kernel.org,
	loongarch@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	Yulong Han <wheatfox17@...oud.com>
Subject: [PATCH] LoongArch: KVM: Add tracepoints for CPUCFG and CSR emulation exits

This patch adds tracepoints to track KVM exits caused by CPUCFG 
and CSR emulation. Note that IOCSR emulation tracing is already
covered by the generic trace_kvm_iocsr().

Signed-off-by: Yulong Han <wheatfox17@...oud.com>
---
 arch/loongarch/kvm/exit.c  |  2 ++
 arch/loongarch/kvm/trace.h | 14 +++++++++++++-
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c
index fa52251b3bf1c..6a47a23ae9cd6 100644
--- a/arch/loongarch/kvm/exit.c
+++ b/arch/loongarch/kvm/exit.c
@@ -289,9 +289,11 @@ static int kvm_trap_handle_gspr(struct kvm_vcpu *vcpu)
 	er = EMULATE_FAIL;
 	switch (((inst.word >> 24) & 0xff)) {
 	case 0x0: /* CPUCFG GSPR */
+		trace_kvm_exit_cpucfg(vcpu, KVM_TRACE_EXIT_CPUCFG);
 		er = kvm_emu_cpucfg(vcpu, inst);
 		break;
 	case 0x4: /* CSR{RD,WR,XCHG} GSPR */
+		trace_kvm_exit_csr(vcpu, KVM_TRACE_EXIT_CSR);
 		er = kvm_handle_csr(vcpu, inst);
 		break;
 	case 0x6: /* Cache, Idle and IOCSR GSPR */
diff --git a/arch/loongarch/kvm/trace.h b/arch/loongarch/kvm/trace.h
index 1783397b1bc88..145514dab6d5b 100644
--- a/arch/loongarch/kvm/trace.h
+++ b/arch/loongarch/kvm/trace.h
@@ -46,11 +46,15 @@ DEFINE_EVENT(kvm_transition, kvm_out,
 /* Further exit reasons */
 #define KVM_TRACE_EXIT_IDLE		64
 #define KVM_TRACE_EXIT_CACHE		65
+#define KVM_TRACE_EXIT_CPUCFG		66
+#define KVM_TRACE_EXIT_CSR		67
 
 /* Tracepoints for VM exits */
 #define kvm_trace_symbol_exit_types			\
 	{ KVM_TRACE_EXIT_IDLE,		"IDLE" },	\
-	{ KVM_TRACE_EXIT_CACHE,		"CACHE" }
+	{ KVM_TRACE_EXIT_CACHE,		"CACHE" },	\
+	{ KVM_TRACE_EXIT_CPUCFG,	"CPUCFG" },	\
+	{ KVM_TRACE_EXIT_CSR,		"CSR" }
 
 DECLARE_EVENT_CLASS(kvm_exit,
 	    TP_PROTO(struct kvm_vcpu *vcpu, unsigned int reason),
@@ -82,6 +86,14 @@ DEFINE_EVENT(kvm_exit, kvm_exit_cache,
 	     TP_PROTO(struct kvm_vcpu *vcpu, unsigned int reason),
 	     TP_ARGS(vcpu, reason));
 
+DEFINE_EVENT(kvm_exit, kvm_exit_cpucfg,
+	     TP_PROTO(struct kvm_vcpu *vcpu, unsigned int reason),
+	     TP_ARGS(vcpu, reason));
+
+DEFINE_EVENT(kvm_exit, kvm_exit_csr,
+	     TP_PROTO(struct kvm_vcpu *vcpu, unsigned int reason),
+	     TP_ARGS(vcpu, reason));
+
 DEFINE_EVENT(kvm_exit, kvm_exit,
 	     TP_PROTO(struct kvm_vcpu *vcpu, unsigned int reason),
 	     TP_ARGS(vcpu, reason));
-- 
2.39.5