linux-kernel - Re: [PATCH 3/9] KVM: SVM: Add tracepoint for nested vmrun

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Date:	Thu, 08 Oct 2009 17:58:22 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Joerg Roedel <joerg.roedel@....com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	Alexander Graf <agraf@...e.de>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/9] KVM: SVM: Add tracepoint for nested vmrun

On 10/08/2009 12:03 PM, Joerg Roedel wrote:
> This patch adds a dedicated kvm tracepoint for a nested
> vmrun.
>
> Signed-off-by: Joerg Roedel<joerg.roedel@....com>
> ---
>   arch/x86/kvm/svm.c   |    6 ++++++
>   arch/x86/kvm/trace.h |   33 +++++++++++++++++++++++++++++++++
>   arch/x86/kvm/x86.c   |    1 +
>   3 files changed, 40 insertions(+), 0 deletions(-)
>
> diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
> index 884bffc..907af3f 100644
> --- a/arch/x86/kvm/svm.c
> +++ b/arch/x86/kvm/svm.c
> @@ -1726,6 +1726,12 @@ static bool nested_svm_vmrun(struct vcpu_svm *svm)
>   	/* nested_vmcb is our indicator if nested SVM is activated */
>   	svm->nested.vmcb = svm->vmcb->save.rax;
>
> +	trace_kvm_nested_vmrun(svm->vmcb->save.rip - 3, svm->nested.vmcb,
> +			       nested_vmcb->save.rip,
> +			       nested_vmcb->control.int_ctl,
> +			       nested_vmcb->control.event_inj,
> +			       nested_vmcb->control.nested_ctl);
> +
>    

It's better to pass only 'svm' as argument and have the tracepoint code 
derive everything else, since (I think) argument setup is done 
unconditionally, and only the actual trace_kvm call is patched out.  It 
may not work out due to where the trace code is compiled, but it's worth 
trying.

-- 
error compiling committee.c: too many arguments to function

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