RISCV: KVM: add tracepoints for entry and exit events

Like other architectures, RISCV KVM also needs to add these event
tracepoints to count the number of times kvm guest entry/exit.
Signed-off-by: Shenlin Liang <liangshenlin@eswincomputing.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Tested-by: Atish Patra <atishp@rivosinc.com>
Link: https://lore.kernel.org/r/20240422080833.8745-2-liangshenlin@eswincomputing.comSigned-off-by: Anup Patel <anup@brainfault.org>

arch/riscv/kvm/trace.h

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Tracepoints for RISC-V KVM
+ *
+ * Copyright 2024 Beijing ESWIN Computing Technology Co., Ltd.
+ *
+ */
+#if !defined(_TRACE_KVM_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_KVM_H
+
+#include <linux/tracepoint.h>
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM kvm
+
+TRACE_EVENT(kvm_entry,
+	TP_PROTO(struct kvm_vcpu *vcpu),
+	TP_ARGS(vcpu),
+
+	TP_STRUCT__entry(
+		__field(unsigned long, pc)
+	),
+
+	TP_fast_assign(
+		__entry->pc	= vcpu->arch.guest_context.sepc;
+	),
+
+	TP_printk("PC: 0x016%lx", __entry->pc)
+);
+
+TRACE_EVENT(kvm_exit,
+	TP_PROTO(struct kvm_cpu_trap *trap),
+	TP_ARGS(trap),
+
+	TP_STRUCT__entry(
+		__field(unsigned long, sepc)
+		__field(unsigned long, scause)
+		__field(unsigned long, stval)
+		__field(unsigned long, htval)
+		__field(unsigned long, htinst)
+	),
+
+	TP_fast_assign(
+		__entry->sepc		= trap->sepc;
+		__entry->scause		= trap->scause;
+		__entry->stval		= trap->stval;
+		__entry->htval		= trap->htval;
+		__entry->htinst		= trap->htinst;
+	),
+
+	TP_printk("SEPC:0x%lx, SCAUSE:0x%lx, STVAL:0x%lx, HTVAL:0x%lx, HTINST:0x%lx",
+		__entry->sepc,
+		__entry->scause,
+		__entry->stval,
+		__entry->htval,
+		__entry->htinst)
+);
+
+#endif /* _TRACE_RSICV_KVM_H */
+
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE trace
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>

arch/riscv/kvm/vcpu.c

@@ -21,6 +21,9 @@
 #include <asm/cacheflush.h>
 #include <asm/kvm_vcpu_vector.h>
 
+#define CREATE_TRACE_POINTS
+#include "trace.h"
+
 const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
 	KVM_GENERIC_VCPU_STATS(),
 	STATS_DESC_COUNTER(VCPU, ecall_exit_stat),
@@ -831,6 +834,8 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
 		 */
 		kvm_riscv_local_tlb_sanitize(vcpu);
 
+		trace_kvm_entry(vcpu);
+
 		guest_timing_enter_irqoff();
 
 		kvm_riscv_vcpu_enter_exit(vcpu);
@@ -869,6 +874,8 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
 
 		local_irq_enable();
 
+		trace_kvm_exit(&trap);
+
 		preempt_enable();
 
 		kvm_vcpu_srcu_read_lock(vcpu);