linux-kernel - Re: [PATCH 0/12] Nested SVM cleanups

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Message-ID: <4A7057BE.6020900@redhat.com>
Date:	Wed, 29 Jul 2009 17:07:58 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Joerg Roedel <joerg.roedel@....com>
CC:	Alexander Graf <agraf@...e.de>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/12] Nested SVM cleanups

On 07/29/2009 04:58 PM, Joerg Roedel wrote:
> On Wed, Jul 29, 2009 at 04:59:48PM +0300, Avi Kivity wrote:
>    
>> On 07/29/2009 04:48 PM, Joerg Roedel wrote:
>>      
>>> Performance isn't too bad even without this. At least if the host
>>> supports nested paging :) But shadow nested paging should give nested
>>> svm a real boost, thats very true.
>>>        
>> Well, any workload that benefits from npt would benefit from nnpt a
>> lot more.
>>      
>
> Most complicated part will be the two dimensional software page walker.
> That will be a somewhat intrusive change (at least if I do it without
> code duplication). But lets see how challenging this will become...
>    

I think if you change the memory accessors to go through 
kvm_read_guest_virt() again, you'll get it almost for free.  You'll need 
to supply a context so the accessors know which level you're accessing.

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

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