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RE: [Xen-devel] [PATCH][SVM] fix pae for guests on 32bit HV

To: "Nakajima, Jun" <jun.nakajima@xxxxxxxxx>, "Woller, Thomas" <thomas.woller@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: RE: [Xen-devel] [PATCH][SVM] fix pae for guests on 32bit HV
From: "Petersson, Mats" <Mats.Petersson@xxxxxxx>
Date: Fri, 21 Apr 2006 11:50:47 +0200
Delivery-date: Fri, 21 Apr 2006 02:57:17 -0700
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Thread-topic: [Xen-devel] [PATCH][SVM] fix pae for guests on 32bit HV

> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Nakajima, Jun
> Sent: 21 April 2006 00:02
> To: Woller, Thomas; xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: RE: [Xen-devel] [PATCH][SVM] fix pae for guests on 32bit HV
> Woller, Thomas wrote:
> >> The current shadow code does not support PAE guests on the 
> PAE Xen. 
> >> It's much harder given (compared with x64-64) the limited bits in 
> >> page_info. Should work on the 64-bit Xen. Anyway, we need 
> to cleanly 
> >> kill such guests on the PAE Xen.
> > Now this does mean no NX support on PAE xen.
> That's right. 

And it's not a big limitation. There's no CPU's (at least as far as I'm
aware) available that are 32-bit only, that support NX - so you can run
a 64-bit Hypervisor on all CPU's that have NX support, and if you want
to run a 32-bit guest with PAE + NX, that'll work fine. 


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