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Re: [Xen-devel] PAE, Elf headers, and Extended CR3 registers

To: Randy Thelen <rthelen@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] PAE, Elf headers, and Extended CR3 registers
From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date: Thu, 14 Sep 2006 15:42:02 +0100
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On 14/9/06 08:40, "Randy Thelen" <rthelen@xxxxxxxxxx> wrote:

> I'm trying to figure out why it makes sense to assume that if the elf
> header notes are present and they indicate the use of PAE then an
> extended CR3 register is present.

[extended-cr3] was only needed to provide backward compatibility for old
guests that do not grok the extended cr3 format. None of those older guests
support this new Elf notes format (since the new format is much newer than
the introduction of extended-cr3 format). So if the guest uses Elf notes
then it is implicit that it understands extended cr3 format and there is no
need to state that explicitly.

 -- Keir

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