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RISCV: KVM: add tracepoints for entry and exit events

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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.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Shenlin Liang 2024-04-22 08:08:32 +00:00 committed by Anup Patel
parent 3385339296
commit 91195a90f1
2 changed files with 74 additions and 0 deletions
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67
arch/riscv/kvm/trace.h Normal file
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@ -0,0 +1,67 @@
// 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>

7
arch/riscv/kvm/vcpu.c
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@ -21,6 +21,9 @@
#include <asm/cacheflush.h> #include <asm/cacheflush.h>
#include <asm/kvm_vcpu_vector.h> #include <asm/kvm_vcpu_vector.h>
#define CREATE_TRACE_POINTS
#include "trace.h"
const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = { const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
KVM_GENERIC_VCPU_STATS(), KVM_GENERIC_VCPU_STATS(),
STATS_DESC_COUNTER(VCPU, ecall_exit_stat), 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); kvm_riscv_local_tlb_sanitize(vcpu);
trace_kvm_entry(vcpu);
guest_timing_enter_irqoff(); guest_timing_enter_irqoff();
kvm_riscv_vcpu_enter_exit(vcpu); kvm_riscv_vcpu_enter_exit(vcpu);
@ -869,6 +874,8 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
local_irq_enable(); local_irq_enable();
trace_kvm_exit(&trap);
preempt_enable(); preempt_enable();
kvm_vcpu_srcu_read_lock(vcpu); kvm_vcpu_srcu_read_lock(vcpu);