Re: [Xen-devel] [PATCH][HVM] fix migration from NX-capable machine to non-NX-capable machine

["Christoph Egger" <Christoph.Egger@xxxxxxx>]

>
> > As for AMD, are there any SVM CPUs that do not also support NX?
>
> I saw this bug on an Intel CPU that supported NX -- it was just
> disabled in the BIOS.  I'll be speaking with some AMD folks later this
> morning, so I'll ask whether the same thing is possible w/AMD SVM.

You can figure out, if NX is supported by looking up the EFER.
It is possible to enable/disable NX in the PAE-paging mode by
setting/clearing the NXE bit in EFER.

Christoph


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