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RE: [Xen-users] 32 bit guests on 64 bit xen0 ?

  • To: "Robert Hulme" <rob@xxxxxxxxxxxx>, "Xen-users" <xen-users@xxxxxxxxxxxxxxxxxxx>
  • From: "Petersson, Mats" <Mats.Petersson@xxxxxxx>
  • Date: Thu, 6 Apr 2006 20:32:25 +0200
  • Delivery-date: Thu, 06 Apr 2006 11:38:56 -0700
  • List-id: Xen user discussion <xen-users.lists.xensource.com>
  • Thread-index: AcZZp67volYuzgEpTGKjKRSf8uPtAwAAD4IQ
  • Thread-topic: [Xen-users] 32 bit guests on 64 bit xen0 ?

> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Robert Hulme
> Sent: 06 April 2006 18:36
> To: Xen-users
> Subject: [Xen-users] 32 bit guests on 64 bit xen0 ?
> Is this currently possible?
> I've just got 2 Opteron 265's that I'm about to put into a 4 
> way server with 8GB of RAM.

No, your guest, in paravirtualized mode, will have to have the same
bitness as your Xen kernel. There's been some discussions about adding a
shim-layer to support 32-bit para-virtualized kernel on top of 64-bit
Xen, but so far no one has added any actual support for it. 

The fully virtualized support that AMD and Intel has added will support
32-bit guests on top of 64-bit Xen (but not the other way around). But
that will need new processors from what you have now. 


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