linux-kernel - Re: [PATCH] Move VMEnter and VMExit tracepoints closer to the actual event

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Message-ID: <832ccdcd6b199f45b64fc10a70b9b7962071badd.camel@suse.com>
Date:   Fri, 21 May 2021 09:13:31 +0200
From:   Dario Faggioli <dfaggioli@...e.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Stefano De Venuto <stefano.devenuto99@...il.com>,
        linux-kernel@...r.kernel.org
Cc:     pbonzini@...hat.com, seanjc@...gle.com, vkuznets@...hat.com,
        wanpengli@...cent.com, jmattson@...gle.com, x86@...nel.org,
        hpa@...or.com, kvm@...r.kernel.org, rostedt@...dmis.org,
        y.karadz@...il.com
Subject: Re: [PATCH] Move VMEnter and VMExit tracepoints closer to the
 actual event

Hi Thomas, 

And thanks a lot for the review!

On Thu, 2021-05-20 at 09:21 +0200, Thomas Gleixner wrote:
> On Wed, May 19 2021 at 20:23, Stefano De Venuto wrote:
> > diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
> > index 05eca131eaf2..c77d4866e239 100644
> > --- a/arch/x86/kvm/svm/svm.c
> > +++ b/arch/x86/kvm/svm/svm.c
> > @@ -3707,6 +3705,8 @@ static noinstr void
> > svm_vcpu_enter_exit(struct kvm_vcpu *vcpu)
> >  
> >         kvm_guest_enter_irqoff();
> >  
> > +       trace_kvm_entry(vcpu);
> 
> No. This violates the noinstr rules and will make objtool complain on
> a
> full validation run.
> 
Ok, I see, sorry for not noticing it.

Well, in this specific case --considering others' reviews-- it seems
that the tracepoints will be moved to somewhere else anyway, but we'll
make sure to run all the proper validation steps next time.

Thanks again and Regards
-- 
Dario Faggioli, Ph.D
http://about.me/dario.faggioli
Virtualization Software Engineer
SUSE Labs, SUSE https://www.suse.com/
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