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

  • To: "Andi Kleen" <ak@xxxxxxx>, "Sami Haahtinen" <ressu@xxxxxxxxxxxx>
  • From: "Petersson, Mats" <mats.petersson@xxxxxxx>
  • Date: Mon, 28 Nov 2005 11:15:16 +0100
  • Cc: xen-users@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Mon, 28 Nov 2005 10:15:39 +0000
  • List-id: Xen user discussion <xen-users.lists.xensource.com>
  • Thread-index: AcXzoOvXTsu/Veu3RpeTVzEk/K0VzAAYz5TQ
  • Thread-topic: [Xen-users] Re: 32 bit versus 64 bit

> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Andi Kleen
> Sent: 27 November 2005 03:55
> To: Sami Haahtinen
> Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-users] Re: 32 bit versus 64 bit
> Sami Haahtinen <ressu@xxxxxxxxxxxx> 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. 


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