RE: [Xen-users] 32bit DomuU on 64-bit Xen

["Petersson, Mats" <Mats.Petersson@xxxxxxx>]

> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Lionel Bouton
> Sent: 24 October 2006 16:14
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-users] 32bit DomuU on 64-bit Xen
> 
> Hi,
> 
> from what I could find digging around, it is ok to run a 32-bit DomU 
> with a 64bit Xen/Dom0 as long as you use linux32 to avoid the package 
> utilities from trying to install 64 bit packages in the DomUs.

Ehm, no you CAN NOT run 32-bit DomU on a 64-bit Xen/Dom0, because all
kernel modes must be the same (32-bit no PAE, 32-bit PAE or 64-bit). 
> 
> What I'm not sure of is if you can run linux32 without modifying the 
> DomU init scripts (by using initrd for example) so that the 
> DomU never 
> thinks it is running on a 64-bit arch. If you can do it with a custom 
> initrd, I'd like to see one example.

You can, if you install a 64-bit kernel, run "linux32" when you install
"stupid" applications that don't understand that 32-bit binaries are
supported by 64-bit. You shouldn't have to do this in the "average"
case, applications will "just work". But there are some rare exceptions
that think that "If this isn't an i[3456]86 archiecture, I'm not going
to install". 

You will of course have to install 32-bit support-libraries (which is
most often default in the distro anyways) - but it works just fine to do
"rpm -i blah-x.y.z-i386.rpm" on a x86_64 machine - it will install the
32-bit version on your machine, and all will work just like you expect
it to... 

--
Mats
> 
> As anyone set up such an environment or knows such one?
> 
> Lionel.
> 
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