RE: [Xen-users] dom0 i386 domU 64 bit ?

["Petersson, Mats" <Mats.Petersson@xxxxxxx>]

> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Karsten Nielsen
> Sent: 11 July 2006 09:11
> To: xen mailinglist
> Subject: [Xen-users] dom0 i386 domU 64 bit ?
> 
> Hi list.
> 
> I have a question.
> Is it possible to run a domU 64 bit on a dom0 32 bit?
> 
> The hardware is a EM64T cpu but I have installed on an 32 bit cpu it 
> runs fine on th EM64T. I would prefere not to reinstall the 
> dom0 and all 
> the domU's if I have to reinstall the dom0.

Xen, Dom0 and DomU all have to be the same bitness, 32-bit, 32-bit PAE
or 64-bit. This is because there's no translation layer for translating
the calls from 32-bit to 64-bit (or the other way around). It's in the
works to support 32-bit on 64-bit (other way around obviously is a
little bit more difficult <grin>). 

With full virtualization (= HVM = AMD SVM or Intel VT) it's possible to
mix any bitness less or equal to the hypervisor (and Dom0 - which is
still paravirtual in this case too - so needs to be same as hypervisor).

You can of course run 32-bit applications in the 64-bit OS if you want -
it works really well with very few exceptions (32-bit-only, binary-only,
kernel-modules being the most obvious case of "doesn't work in 64-bit
OS"). 

--
Mats

> 
> regards
> - Karsten
> 
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