linux-kernel - Re: [PATCH] kvm mmu: reduce 50% memory usage

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Message-ID: <4BDA863A.9060702@redhat.com>
Date:	Fri, 30 Apr 2010 10:26:50 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Lai Jiangshan <laijs@...fujitsu.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, kvm@...r.kernel.org
Subject: Re: [PATCH] kvm mmu: reduce 50% memory usage

On 04/30/2010 05:25 AM, Lai Jiangshan wrote:
>
>> It's unrelated to TDP, same issue with shadow.  I think the calculation
>> is correct.  For example the 4th spte for a level=2 page will yield
>> gfn=4*512.
>>      
> Avi, Marcelo
> Thank you very much.
>
> The calculation I used is correct.
>    

Yes.  btw, can you update the patch to also correct mmu.txt?

> The fault is comes from the FNAME(fetch) when using shadow page.
>
> I have fix it in the patch
> "[RFC PATCH] kvm: calculate correct gfn for small host pages which emulates large guest pages"
>
> (It seems that the mail lists is unreachable, did you receive it?)
>    

The lists are down at the moment.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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