Add a few trace events for entering and coming out of guest mode, as well
as re-entering it from a guest exit exception.
Signed-off-by: James Hogan <james.hogan@xxxxxxxxxx>
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Cc: Radim Krčmář <rkrcmar@xxxxxxxxxx>
Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: kvm@xxxxxxxxxxxxxxx
Cc: linux-mips@xxxxxxxxxxxxxx
---
arch/mips/kvm/mips.c | 4 ++++
arch/mips/kvm/trace.h | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 52 insertions(+)
diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index e9e40b9dd9be..b5ad2ba1847a 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -410,7 +410,9 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
/* Disable hardware page table walking while in guest */
htw_stop();
+ trace_kvm_enter(vcpu);
r = vcpu->arch.vcpu_run(run, vcpu);
+ trace_kvm_out(vcpu);
/* Re-enable HTW before enabling interrupts */
htw_start();
@@ -1389,6 +1391,8 @@ skip_emul:
}
if (ret == RESUME_GUEST) {
+ trace_kvm_reenter(vcpu);
+
/*
* If FPU / MSA are enabled (i.e. the guest's FPU / MSA context
* is live), restore FCR31 / MSACSR.
diff --git a/arch/mips/kvm/trace.h b/arch/mips/kvm/trace.h
index 1d67d9e0f340..5b5dbd8eacb0 100644
--- a/arch/mips/kvm/trace.h
+++ b/arch/mips/kvm/trace.h
@@ -17,6 +17,54 @@
#define TRACE_INCLUDE_PATH .
#define TRACE_INCLUDE_FILE trace
+/*
+ * Tracepoints for VM enters
+ */
+TRACE_EVENT(kvm_enter,
+ TP_PROTO(struct kvm_vcpu *vcpu),
+ TP_ARGS(vcpu),
+ TP_STRUCT__entry(
+ __field(unsigned long, pc)
+ ),
+
+ TP_fast_assign(
+ __entry->pc = vcpu->arch.pc;
+ ),
+
+ TP_printk("PC: 0x%08lx",
+ __entry->pc)
+);
+
+TRACE_EVENT(kvm_reenter,
+ TP_PROTO(struct kvm_vcpu *vcpu),
+ TP_ARGS(vcpu),
+ TP_STRUCT__entry(
+ __field(unsigned long, pc)
+ ),
+
+ TP_fast_assign(
+ __entry->pc = vcpu->arch.pc;
+ ),
+
+ TP_printk("PC: 0x%08lx",
+ __entry->pc)
+);
+
+TRACE_EVENT(kvm_out,
+ TP_PROTO(struct kvm_vcpu *vcpu),
+ TP_ARGS(vcpu),
+ TP_STRUCT__entry(
+ __field(unsigned long, pc)
+ ),
+
+ TP_fast_assign(
+ __entry->pc = vcpu->arch.pc;
+ ),
+
+ TP_printk("PC: 0x%08lx",
+ __entry->pc)
+);
+
/* The first 32 exit reasons correspond to Cause.ExcCode */
#define KVM_TRACE_EXIT_INT 0
#define KVM_TRACE_EXIT_TLBMOD 1
--
2.4.10
