This tracepoint only provides a hook for poking vcpu exits information,
not exported to tracefs.
A timestamp is added for the last vcpu exit, which would be useful for
analysis for vcpu exits.
Signed-off-by: Jing Zhang <jingzhangos@xxxxxxxxxx>
---
arch/arm64/include/asm/kvm_host.h | 3 +++
arch/arm64/kvm/arm.c | 2 ++
arch/arm64/kvm/trace_arm.h | 8 ++++++++
3 files changed, 13 insertions(+)
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index daa68b053bdc..576f2c18d008 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -415,6 +415,9 @@ struct kvm_vcpu_arch {
/* Arch specific exit reason */
enum arm_exit_reason exit_reason;
+
+ /* Timestamp for the last vcpu exit */
+ u64 last_exit_time;
};
/* Pointer to the vcpu's SVE FFR for sve_{save,load}_state() */
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index f49ebdd9c990..98631f79c182 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -783,6 +783,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
ret = 1;
run->exit_reason = KVM_EXIT_UNKNOWN;
while (ret > 0) {
+ trace_kvm_vcpu_exits(vcpu);
/*
* Check conditions before entering the guest
*/
@@ -898,6 +899,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
local_irq_enable();
trace_kvm_exit(ret, kvm_vcpu_trap_get_class(vcpu), *vcpu_pc(vcpu));
+ vcpu->arch.last_exit_time = ktime_to_ns(ktime_get());
/* Exit types that need handling before we can be preempted */
handle_exit_early(vcpu, ret);
diff --git a/arch/arm64/kvm/trace_arm.h b/arch/arm64/kvm/trace_arm.h
index 33e4e7dd2719..3e7dfd640e23 100644
--- a/arch/arm64/kvm/trace_arm.h
+++ b/arch/arm64/kvm/trace_arm.h
@@ -301,6 +301,14 @@ TRACE_EVENT(kvm_timer_emulate,
__entry->timer_idx, __entry->should_fire)
);
+/*
+ * Following tracepoints are not exported in tracefs and provide hooking
+ * mechanisms only for testing and debugging purposes.
+ */
+DECLARE_TRACE(kvm_vcpu_exits,
+ TP_PROTO(struct kvm_vcpu *vcpu),
+ TP_ARGS(vcpu));
+
#endif /* _TRACE_ARM_ARM64_KVM_H */
#undef TRACE_INCLUDE_PATH
--
2.35.1.723.g4982287a31-goog
