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Re: [Xen-users] xen version compatibility

To: "Daniel P. Berrange" <berrange@xxxxxxxxxx>
Subject: Re: [Xen-users] xen version compatibility
From: Dylan Martin <dmartin@xxxxxxxxxxxx>
Date: Mon, 21 May 2007 18:12:51 -0700
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Do you know if you can run dom0 and the hv with different versions?
E.G. I install the HV from source (3.1.0) and then I use yum to
update the kernel on dom0 so it's using 3.0.3.  

> On Mon, May 21, 2007 at 05:53:53PM -0700, Dylan Martin wrote:
> > If I have a linux kernel on dom0 from xen 3.0.2 and my xen binary is
> > version 3.1.0, can I expect things to work?  What about if my dom0
> > kernel and xen binary are both 3.1.0 and I have a para virt domU with
> > xen 3.0.2 code in?  What about if the tools are from a different
> > version of xen?  
> The HV <-> DomU  ABI is guarenteed to be stable for the lifetime of 
> 3.x series of Xen releases. So a 3.0.2 guest should work on a 3.1.0
> hypervisor, and vica-verca. There may, however, be lesser capabilities
> with certain combinations - for example if you want to run 32-on-64
> guests, you do need to have 3.1.0 Dom0 kernel due to backend driver
> changes.
> > I'm asking because I'm running fedora 6 and I'd like to try out xen
> > 3.1.0 or 3.0.4 but I don't want to have to manually compile all my
> > kernels all the time.
> That should work. We test running Fedora 7 (Xen 3.1.0) guests on a
> Fedora Core 6 dom0 (3.0.3), and also test FC6 guests on a Fedora 7 
> Dom0. Any problems should be reported as bugs :-)
> Dan.
> -- 
> |=- Red Hat, Engineering, Emerging Technologies, Boston.  +1 978 392 2496 -=|
> |=-           Perl modules: http://search.cpan.org/~danberr/              -=|
> |=-               Projects: http://freshmeat.net/~danielpb/               -=|
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