RE: [Xen-users] Re: 32 bit versus 64 bit

Petersson, Mats
2005-11-28T10:15:16Z

> -----Original Message-----
> From: xen-users-bounces@lists.xensource.com
> [mailto:xen-users-bounces@lists.xensource.com] On Behalf Of Andi Kleen
> Sent: 27 November 2005 03:55
> To: Sami Haahtinen
> Cc: xen-users@lists.xensource.com
> Subject: [Xen-users] Re: 32 bit versus 64 bit
>
> Sami Haahtinen <ressu@ressukka.net> writes:
> >
> > Any hope here?
>
> Normally it works (haven''t tried it in Xen but many times
> with native kernels)
>
> The biggest exceptions are iptables and ipsec (freeswan etc.)
> which have too broken interfaces to be emulated properly.  So
> you will likely need a 64bit iptables in dom0 at least.
>
> I believe the Xen interfaces are also not emulated so in dom
> 0 you will also need matching tools. This normally means a
> 64bit python.
> Doesn''t affect domUs of course.
>
> -Andi
>
This comment isn''t exactly to Andi''s comments, just general:
If you''re planning on running Xen with para-virtualized DomU, that is
without AMD SVM [aka Pacifica] or Intel VT, then your DomU needs to be
the same bitness (and PAE-setting) as the Dom0 and Xen kernel.

So you can''t just mix''n''match DomU''s and
Dom0/Xen.

With SVM/VT it would be possible to mix any in DomU with a Dom0 that is
"bigger" than the DomU.

--
Mats