Re: [Xen-users] xen version compatibility

["Daniel P. Berrange" <berrange@xxxxxxxxxx>]

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.
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