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arm/arm64: KVM: Add exit reaons to kvm_exit event tracing 

This patch extends trace_kvm_exit() to include KVM exit reasons
(i.e. EC of HSR). The tracing function then dumps both exit reason
and PC of vCPU, shown as the following. Tracing tools can use this
new exit_reason field to better understand the behavior of guest VMs.

886.301252: kvm_exit:             HSR_EC: 0x0024, PC: 0xfffffe0000506b28

Signed-off-by: Wei Huang <wei@redhat.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
This commit is contained in:
Wei Huang 2015-01-30 13:09:26 -05:00 committed by Paolo Bonzini
parent a050dfb21c
commit 91314cb005
2 changed files with 8 additions and 4 deletions
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2
arch/arm/kvm/arm.c
View File

@ -540,7 +540,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
vcpu->mode = OUTSIDE_GUEST_MODE;
kvm_guest_exit();
trace_kvm_exit(*vcpu_pc(vcpu));
trace_kvm_exit(kvm_vcpu_trap_get_class(vcpu), *vcpu_pc(vcpu));
/*
* We may have taken a host interrupt in HYP mode (ie
* while executing the guest). This interrupt is still

10
arch/arm/kvm/trace.h
View File

@ -25,18 +25,22 @@ TRACE_EVENT(kvm_entry,
);
TRACE_EVENT(kvm_exit,
TP_PROTO(unsigned long vcpu_pc),
TP_ARGS(vcpu_pc),
TP_PROTO(unsigned int exit_reason, unsigned long vcpu_pc),
TP_ARGS(exit_reason, vcpu_pc),
TP_STRUCT__entry(
__field( unsigned int, exit_reason )
__field( unsigned long, vcpu_pc )
),
TP_fast_assign(
__entry->exit_reason = exit_reason;
__entry->vcpu_pc = vcpu_pc;
),
TP_printk("PC: 0x%08lx", __entry->vcpu_pc)
TP_printk("HSR_EC: 0x%04x, PC: 0x%08lx",
__entry->exit_reason,
__entry->vcpu_pc)
);
TRACE_EVENT(kvm_guest_fault,