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

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Message-ID: <20090729131319.GF18313@amd.com>
Date:	Wed, 29 Jul 2009 15:13:19 +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 04:13:35PM +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. Another reason is that with
this patch the behavior of nested SVM is more aligned to real hardware.

	Joerg


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