Xen users - May 2006 - Problems booting a 32bit domU kernel on a Debian sarge amd64 x86_64 dom0 host.

I installed Debian sarge amd64 on a Intel em64t processor machines and have
been using the Xen 3.0 packages in backports.org.
I can boot a 32 bit guest OS fine if I use the
vmlinuz-2.6.16-1-xen-em64t-p4kernel, but when trying to use the stock
vmlinuz-2.6.16-xen from their binary tarball, or building it from the source
package I get the following error:


xentest:/var/log# xm create debian0.cfg  -c
Using config file "/etc/xen/debian0.cfg".
Error: (22, ''Invalid argument'')


xentest:/var/log# cat xend-debug.log
ERROR: Kernel not a Xen-compatible Elf image.
ERROR: Error constructing guest OS


Is it not possible to have a x86_64 dom0 run a 32 bit domU kernel?


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On Wednesday 24 May 2006 9:00 am, Brian Weaver wrote:
> Is it not possible to have a x86_64 dom0 run a 32 bit domU kernel?
nope, the guest kernels (both dom0 and domU) have to use the same memory model 
as the Xen hypervisor: 32bit, PAE or 64bit.  that implies that dom0 and domU 
have to match too.

for HVM guests it''s more relaxed, and a 64bit hypervisor can run 32bit
HVM
guests. (not sure about PAE)

-- 
Javier


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> -----Original Message-----
> From: xen-users-bounces@lists.xensource.com 
> [mailto:xen-users-bounces@lists.xensource.com] On Behalf Of 
> Javier Guerra
> Sent: 24 May 2006 20:09
> To: xen-users@lists.xensource.com
> Subject: Re: [Xen-users] Problems booting a 32bit domU kernel 
> on a Debian sarge amd64 x86_64 dom0 host.
> 
> On Wednesday 24 May 2006 9:00 am, Brian Weaver wrote:
> > Is it not possible to have a x86_64 dom0 run a 32 bit domU kernel?
> 
> nope, the guest kernels (both dom0 and domU) have to use the 
> same memory model as the Xen hypervisor: 32bit, PAE or 64bit. 
>  that implies that dom0 and domU have to match too.
> 
> for HVM guests it''s more relaxed, and a 64bit hypervisor can 
> run 32bit HVM guests. (not sure about PAE)
PAE should work on 64-bit HV. It''s not clear if PAE on PAE works or not
- last time I saw something about it, it seemed like it''s not... 

--
Mats
> 
> --
> Javier
> 

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On 5/24/06, Javier Guerra <javier@guerrag.com>
wrote:
> On Wednesday 24 May 2006 9:00 am, Brian Weaver wrote:
> > Is it not possible to have a x86_64 dom0 run a 32 bit domU kernel?
>
> nope, the guest kernels (both dom0 and domU) have to use the same memory
model
> as the Xen hypervisor: 32bit, PAE or 64bit.  that implies that dom0 and
domU
> have to match too.
>
> for HVM guests it''s more relaxed, and a 64bit hypervisor can run
32bit HVM
> guests. (not sure about PAE)
>
> --
> Javier

So I assume with Vanderpool this will work fine? I currently don''t
have any vt processors to test with..

Brian

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