arm/arm64: KVM: Add exit reaons to kvm_exit event tracing (91314cb0) · Commits · 戴 / test

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>

arch/arm/kvm/arm.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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

arch/arm/kvm/trace.h

+7 −3

Original line number	Diff line number	Diff line
		@@ -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,

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