linux-kernel - Re: [PATCH 08/12] kvm/svm: cache nested intercepts

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Message-ID: <20090729134738.GK18313@amd.com>
Date:	Wed, 29 Jul 2009 15:47:38 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	Avi Kivity <avi@...hat.com>
CC:	Alexander Graf <agraf@...e.de>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 08/12] kvm/svm: cache nested intercepts

On Wed, Jul 29, 2009 at 04:26:02PM +0300, Avi Kivity wrote:
> On 07/29/2009 04:13 PM, Joerg Roedel wrote:
> >On Wed, Jul 29, 2009 at 04:13:35PM +0300, Avi Kivity wrote:
> >>I don't see the benefit of this patch.  Accessing the cache is just
> >>as expensive as accessing the real vmcb.
> >
> >The benefit is that we don't have to gup and map the nested vmcb just
> >for checking who will take the intercept.
> 
> Makes sense.
> 
> >Another reason is that with
> >this patch the behavior of nested SVM is more aligned to real hardware.
> 
> Even more important, please put this in the commit log.

Ok, will do.


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