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

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Message-ID: <4ACE113A.7020708@redhat.com>
Date:	Thu, 08 Oct 2009 18:20:10 +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 06:15 PM, Joerg Roedel wrote:
> On Thu, Oct 08, 2009 at 05:58:22PM +0200, Avi Kivity wrote:
>    
>> 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.
>>      
> Hmm, struct vcpu_svm is defined in svm.c and local to that file. It is
> not known in x86.c, where the tracepoints are compiled, or in svm.c
> where trace.h is included. Is this tracepoint it worth it to move the
> definition of vcpu_svm into a (x86-)global header?
>    

I was talking about all svm tracepoints, but no, it isn't worth it.  
Let's leave it till later.

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

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