FROMGIT: 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().

Reviewed-by: Bibo Mao <[email protected]>
Signed-off-by: Yulong Han <[email protected]>
Signed-off-by: Huacai Chen <[email protected]>

(cherry picked from commit 36d09b9
 https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson.git loongarch-next)
Signed-off-by: Kexy Biscuit <[email protected]>

Author: enkerewpo

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 */

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));