Re: [Xen-users] 32bit domU on 64 bit dom0

[Mark Williamson <mark.williamson@xxxxxxxxxxxx>]

> On Tue, Aug 14, 2007 at 03:33:53AM +0100, Mark Williamson wrote:
> > > Yes it is possible.  But you must have a kernel with the 3.1 patches
> > > on dom0 and on dom1.
> >
> > The 32-bit domU shouldn't need 3.1 patches to run on 64-bit Xen.  Any
> > older domU kernel should work so long as it supports PAE.
>
> I think there's a slight complication with that - any 32-bit PAE domU
> should work *provided* the Dom0 tools are new enough.
>
> IIRC the XenD back-compat change to allow 32-bit guests earlier than Xen
> 3.1 to work wasn't made in time for the 3.1 release. In particular you need
> to have changesets 15074 & 15075  - they should backport to 3.1 pretty
> easily

Ah, OK.  Thanks Daniel - I'd missed that when 3.1 got released.  Ah well :-)  
At least future releases should support this properly!

Cheers,
mark

>   changeset:   15074:5c7a1e3abd54
>   user:        Ian Campbell <ian.campbell@xxxxxxxxxxxxx>
>   date:        Tue May 15 17:54:48 2007 +0100
>   files:       tools/libxc/xc_dom.h tools/libxc/xc_dom_x86.c
> tools/python/xen/lowlevel/xc/xc.c description:
>   [BUILDER] Propagate the native protocol ABI for a guest out of the
>   domain builder and in to python code.
>
>   This knowledge will be useful to allow us to pre-seed the protocol
>   field in a VBD entry in xenstore which will allow us to run older
>   kernels in a 32on64 mixed environment.
>
>   changeset:   15075:5efb46bfbcac
>   user:        Ian Campbell <ian.campbell@xxxxxxxxxxxxx>
>   date:        Tue May 15 19:00:48 2007 +0100
>   files:       tools/python/xen/xend/XendDomainInfo.py
> tools/python/xen/xend/server/DevController.py description:
>   [XEND] Write the default ABI to the xenstore entry for each frontend
>   device.
>
>   This allows to run older kernels in a 32on64 mixed environment.
>
> Regards,
> Dan.



-- 
Dave: Just a question. What use is a unicyle with no seat?  And no pedals!
Mark: To answer a question with a question: What use is a skateboard?
Dave: Skateboards have wheels.
Mark: My wheel has a wheel!

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