Commit 91195a90 authored by Shenlin Liang's avatar Shenlin Liang Committed by Anup Patel
Browse files

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: default avatarShenlin Liang <liangshenlin@eswincomputing.com>
Reviewed-by: default avatarAnup Patel <anup@brainfault.org>
Tested-by: default avatarAtish Patra <atishp@rivosinc.com>
Link: https://lore.kernel.org/r/20240422080833.8745-2-liangshenlin@eswincomputing.com


Signed-off-by: default avatarAnup Patel <anup@brainfault.org>
parent 33853392

arch/riscv/kvm/trace.h

0 → 100644
+67 −0
Original line number Diff line number Diff line 
// 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

+7 −0
Original line number Diff line number Diff line
@@ -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);