linux-kernel - Re: [PATCH 0/18][RFC] Nested Paging support for Nested SVM (aka NPT-Virtualization)

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Message-ID: <4B99F01A.2020103@redhat.com>
Date:	Fri, 12 Mar 2010 09:41:14 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Joerg Roedel <joerg.roedel@....com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	Alexander Graf <agraf@...e.de>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/18][RFC] Nested Paging support for Nested SVM (aka NPT-Virtualization)

On 03/04/2010 05:58 PM, Joerg Roedel wrote:
>> You probably need to include a flag in base_role to differentiate
>> between l1 / l2 shadow tables (say if they use the same cr3 value).
>>      
> Not sure if this is necessary. It may be necessary when large pages come
> into play. Otherwise the host npt pages are distinguished by the shadow
> npt pages by the direct-flag.
>    

Hm, I think that direct maps for the same gfn can be shared.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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