On Wed, Oct 20, 2010 at 01:31:57PM +0100, Langley, Morgan (GE Capital) wrote:
>    But Oracle has a 64-bit hypervisor. That is what matters - "XEN" has to be
>    64-bit, Dom0 as well as other Domains can be 32-bit....
> 

Also Citrix Xenserver (and XCP) has 64bit Xen hypervisor (xen.gz),
with a 32bit dom0 Linux.

So yes, it's possible to have 32bit dom0 with a 64bit hypervisor.
You can run both 32bit and 64bit guests on it.

-- Pasi

> 
> 
>    --------------------------------------------------------------------------
> 
>    From: [email protected]
>    [mailto:[email protected]] On Behalf Of John Haxby
>    Sent: Wednesday, October 20, 2010 2:18 PM
>    To: Red Hat Enterprise Linux 5 (Tikanga) discussion mailing-list
>    Subject: Re: [rhelv5-list] XEN: 32 bit host 64 bit guest
> 
> 
> 
> 
> 
>    On 20 October 2010 11:42, Nick Lunt <[1][email protected]>
>    wrote:
> 
>    can't find a definitive answer so does anyone know if I can have a 64bit
>    guest on a 32bit XEN host server ?
> 
> 
> 
>    No, you can't.   You need 64-bit hardware to run a 64-bit guest.
> 
>    However, if you're asking (as people sometimes do) if you can have a 32
>    bit dom0 and 64 bit guests.  Well, the answer is still "no", but with
>    caveats.  OracleVM has a 32 bit dom0 and allows 64 bit guests; RHEL
>    definitely does not, I know what the needed code is, and it's not there.
> 
>    jch
> 
> References
> 
>    Visible links
>    1. mailto:[email protected]

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