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[Xen-devel] Re: [PATCH] supporting non-NX/XD capable processors on x86_6

To: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Subject: [Xen-devel] Re: [PATCH] supporting non-NX/XD capable processors on x86_64 xenlinux
From: Andi Kleen <ak@xxxxxxx>
Date: 18 Aug 2005 17:51:18 +0200
Cc: Jerone Young <jerone@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx
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Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> writes:
> By the way -- from what I've seen of this NX/XD discussion so far, it
> sounds like even if CPUID says that NX/XD is supported, and you set
> the EFER.NXE bit, the BIOS can still cause this to be ignored! Is this
> true and, if so, what will happen if you try to use NX/XD anyway?
> i.e., will the bit be ignored, or will its use cause a page fault?

I don't think that can happen. When NX is disabled or not there it
doesn't appear in CPUID.


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