RE: [Xen-users] Can Xen run 32, 32PAE and 64-bit fully virtualized domains run side-by-side?

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

> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Omer Khalid
> Sent: 16 February 2007 15:49
> To: Krysan, Susan
> Cc: Petersson, Mats; Gerd Hoffmann; Daniel P. Berrange; 
> xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-users] Can Xen run 32, 32PAE and 64-bit 
> fully virtualized domains run side-by-side?
> 
> Hello Krysan,
> 
> I am trying to run 32 bit PAE Para-virtualized VM on a x86_64 
> with Xen 3.0.3 64 bit. I always get this error: Xen Image is 
> not compatiable.

That is the expected behaviour for 3.0.3. Current unstable (to become
3.0.5) contains code to fix this for 32PAE on 64. I don't know if there
are any problems running 32PAE on 64 at the moment [it's not what I'm
working on, so I haven't tried it] - but one thing is for sure, until
the release of 3.0.5, there is no stable release that supports different
bitness in the guest and the hypervisor/Dom0. 

> 
> You said in one of your messages on the Xen user list that 
> you are running 32 bit, 32 bit PAE and 64 bit 
> para-virtualized and HVM VM's with out any problems, where as 
> in some threads from Jan 2007, it was argued that its not 
> possible! I  am confused! 

You can only (in current stable realeases of Xen) run "same on same" PV
guests. HVM guest are able to run "less or equal", meaning that a 64-bit
hypervisor supports "all" types of guests, but a 32-bit hypervisor won't
support 64-bit guests (and non-PAE hypervisor can't take PAE guests). 

> 
> Which version of Xen are you using? And are there specific 
> configuration one have to make for domU images?

Read again what Susan wrote (copied here for clarity):
> Yes, on an x86_64 host you can run a mix of 32-bit, 
> 32-bit PAE, and       64-bit fully virtualized domains side-by-side.
All of those are FULLY VIRTUALIZAED guests (that is HVM or non-PV
guests, whatever you want to call it. 

>I have also run 64-bit paravirtualized domains side-by-side with fully 
> virtualized domains.

Still not claiming to run para-virtual at anything other than "same as
Dom0". 

--
Mats


> 
> Any help would be much appreciated! Best Regards
> 
> Omer
> 
> 
> On 2/9/07, Krysan, Susan <KRYSANS@xxxxxxxxxx> wrote:
> 
>       Yes, on an x86_64 host you can run a mix of 32-bit, 
> 32-bit PAE, and
>       64-bit fully virtualized domains side-by-side.  I have 
> also run 64-bit
>       paravirtualized domains side-by-side with fully 
> virtualized domains.
>       
>       Weekly I boot up the following domains simultaneously 
> on x86_64 host:
>       
>       SMP 64-bit SLES10 paravirtualized domain
>       SMP 32-bit SLES10 fully virtualized domain
>       SMP 32-bit PAE SLES10 fully virtualized domain
>       SMP 64-bit SLES10 fully virtualized domain 
>       UP Windows XP fully virtualized domain
>       UP Windows 2003 Server fully virtualized domain
>       
>       Once the domains have booted, I log in and run top 
> command in the SLES10
>       guests and Windows task manager in the Windows guests. 
>       
>       Thanks,
>       Sue Krysan
>       Linux Systems Group
>       Unisys Corporation
>       
>       -----Original Message-----
>       From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
>       [mailto: xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On 
> Behalf Of Liang Yang
>       Sent: Friday, February 09, 2007 2:17 PM
>       To: xen-users@xxxxxxxxxxxxxxxxxxx 
>       Cc: Xen devel list
>       Subject: [Xen-users] Can Xen run 32,32PAE and 64-bit 
> fully virtualized
>       domains run side-by-side?
>       
>       Hi,
>       
>       Can Xen run 32, 32PAE and 64-bit fully virtualized domains run
>       side-by-side? 
>       Or all DomainUF has to be the same mode?
>       
>       Thanks,
>       
>       Liang
>       
>       
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> 
> 
> 
> -- 
> --------------------------------------------------------------- 
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> IT Department,  CH-1211 Geneva 23, Switzerland
> 
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