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

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Date:   Fri, 21 May 2021 09:58:17 +0200
From:   Dario Faggioli <dfaggioli@...e.com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Stefano De Venuto <stefano.devenuto99@...il.com>
Cc:     linux-kernel@...r.kernel.org, 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!

On Thu, 2021-05-20 at 18:18 +0200, Paolo Bonzini wrote:
> On 20/05/21 17:32, Sean Christopherson wrote:
> > On VMX, I think the tracepoint can be moved below the VMWRITEs
> > without much
> > contention (though doing so is likely a nop), but moving it below
> > kvm_load_guest_xsave_state() requires a bit more discussion.
> 
> Indeed; as a rule of thumb, the tracepoint on SVM could match the 
> clgi/stgi region, and on VMX it could be placed in a similar
> location.
> 
Ok. So, if this is uncontroversial enough, we're more than happy to go
for it... For now. :-)

Let us try it, and see how things end up looking.

Thanks 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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