linux-kernel - Re: [PATCH V3 3/3] kvm: add tracepoint for fast mmio

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Date:	Tue, 25 Aug 2015 14:36:54 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Jason Wang <jasowang@...hat.com>
Cc:	gleb@...nel.org, pbonzini@...hat.com, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, cornelia.huck@...ibm.com
Subject: Re: [PATCH V3 3/3] kvm: add tracepoint for fast mmio

On Tue, Aug 25, 2015 at 05:05:48PM +0800, Jason Wang wrote:
> Cc: Gleb Natapov <gleb@...nel.org>
> Cc: Paolo Bonzini <pbonzini@...hat.com>
> Cc: Michael S. Tsirkin <mst@...hat.com>
> Signed-off-by: Jason Wang <jasowang@...hat.com>
> ---
>  arch/x86/kvm/trace.h | 17 +++++++++++++++++
>  arch/x86/kvm/vmx.c   |  1 +
>  arch/x86/kvm/x86.c   |  1 +
>  3 files changed, 19 insertions(+)
> 
> diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
> index 4eae7c3..2d4e81a 100644
> --- a/arch/x86/kvm/trace.h
> +++ b/arch/x86/kvm/trace.h
> @@ -128,6 +128,23 @@ TRACE_EVENT(kvm_pio,
>  		  __entry->count > 1 ? "(...)" : "")
>  );
>  
> +TRACE_EVENT(kvm_fast_mmio,
> +	TP_PROTO(u64 gpa),
> +	TP_ARGS(gpa),
> +
> +	TP_STRUCT__entry(
> +		__field(u64,	gpa)
> +	),
> +
> +	TP_fast_assign(
> +		__entry->gpa		= gpa;
> +	),
> +
> +	TP_printk("fast mmio at gpa 0x%llx", __entry->gpa)
> +);
> +
> +
> +

don't add multiple empty lines pls.

>  /*
>   * Tracepoint for cpuid.
>   */
> diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
> index 83b7b5c..a55d279 100644
> --- a/arch/x86/kvm/vmx.c
> +++ b/arch/x86/kvm/vmx.c
> @@ -5831,6 +5831,7 @@ static int handle_ept_misconfig(struct kvm_vcpu *vcpu)
>  	gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS);
>  	if (!kvm_io_bus_write(vcpu, KVM_FAST_MMIO_BUS, gpa, 0, NULL)) {
>  		skip_emulated_instruction(vcpu);
> +		trace_kvm_fast_mmio(gpa);
>  		return 1;
>  	}
>  
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 8f0f6ec..36cf78e 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -8254,6 +8254,7 @@ bool kvm_arch_has_noncoherent_dma(struct kvm *kvm)
>  EXPORT_SYMBOL_GPL(kvm_arch_has_noncoherent_dma);
>  
>  EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_exit);
> +EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_fast_mmio);
>  EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_inj_virq);
>  EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_page_fault);
>  EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_msr);
> -- 
> 2.1.4
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