Re: [Xen-users] Newer DomU changesets on older hypervisor?

[Mark Williamson <mark.williamson@xxxxxxxxxxxx>]

> We provide DomU's for our customers and because of this we try to minimize
> the amount of times we have to reboot/down a host.  We also offer multiple
> kernels the customer can choose from with different configurations.  My
> question is will there be any issue with running newer domU kernels from
> 3.x changeset while hypervisor and dom0 run a kernel build from a older 3.x
> changeset?  Also how about the xen-tools?  If i build a newer version of
> those and run them against a older version of hypervisor and dom0 is that
> going to be asking for problems?

Right now compatibility is as follows:

* Xen, dom0 and tools must be matched
* older XenLinux kernels will run on newer Xen

Newer XenLinux kernels may use APIs which are not available in older Xen 
releases, so currently you can't upgrade to guests that are built for a newer 
hypervisor.  More compatibility in this area is, I believe planned for the 
future.

The best I can suggest is that if you are able to use a distro with decent Xen 
support then they will be able to provide you with bugfixed kernel updates 
that will run on whatever version of Xen they shipped with your OS release, 
so you won't have to compile newer Xenified kernels yourself and risk 
incompatibility.

Cheers,
Mark

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