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Re: [Xen-devel] x86-64 machine_to_phys vs NX bit

from [Keir Fraser] [Permanent Link][Original]
To: "Nakajima, Jun" <jun.nakajima@xxxxxxxxx>, Rik van Riel <riel@xxxxxxxxxx>
Subject: Re: [Xen-devel] x86-64 machine_to_phys vs NX bit
From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date: Fri, 25 Aug 2006 16:10:49 +0100
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On 25/8/06 3:46 pm, "Nakajima, Jun" <jun.nakajima@xxxxxxxxx> wrote:

> I agree, and I'm wondering why we don't have the same problem on i386?
> To me it basically does the same thing.

A long is only 32 bits there, so when we pass the MFN portion the NX bit is
conveniently truncated away!

 -- Keir



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