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Re: [Xen-devel] Weekly VMX status report. Xen: #18846 & Xen0: #749

To: "Nakajima, Jun" <jun.nakajima@xxxxxxxxx>, Gianluca Guida <gianluca.guida@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] Weekly VMX status report. Xen: #18846 & Xen0: #749
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Sat, 13 Dec 2008 23:21:22 +0000
Cc: "Li, Haicheng" <haicheng.li@xxxxxxxxx>, "'xen-devel@xxxxxxxxxxxxxxxxxxx'" <xen-devel@xxxxxxxxxxxxxxxxxxx>, "Li, Xin" <xin.li@xxxxxxxxx>
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On 13/12/2008 22:43, "Nakajima, Jun" <jun.nakajima@xxxxxxxxx> wrote:

>> I think you agree that we don't need to keep guest 'actual' EFER.NX in
>> sync with its 'shadow' EFER.NX?
>> 
> 
> That should be okay. The fact we see the NX bit in the shadow page tables
> means at least the BSP enabled NX. And I don't expect other processors would
> do otherwise. In other words, such out-of-sync situations be transient anyway.

It only matters if we think any guest depends on correct behaviour (i.e.,
reserved-bit #PF) when EFER.NX=0. Which I doubt.

 -- Keir



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