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LoongArch: KVM: Add tracepoints for CPUCFG and CSR emulation exits

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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 <maobibo@loongson.cn>
Signed-off-by: Yulong Han <wheatfox17@icloud.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Yulong Han
2025-07-21 09:26:35 +08:00
committed by Huacai Chen
parent 46ecfb68dd
commit 36d09b96d3
2 changed files with 15 additions and 1 deletions
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2
arch/loongarch/kvm/exit.c
View File

@@ -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 */

14
arch/loongarch/kvm/trace.h
View File

@@ -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));