newer domU older hypervisor?

newer domU older hypervisor?

[Shaun]

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?

-- 

~Shaun 

Re: newer domU older hypervisor?

[Andrew D. Ball]

Unfortunately, I think you are likely to have issues here.  You may have
luck having things at least work for basic functionality, but you
definitely need to match the hypervisor and dom0 kernel w/ the tools.

IMHO, it's a snafu to upgrade para-virtualized domU kernels that needs
to be addressed better.

Peace.
Andrew
On Mon, 2006-07-31 at 16:23 -0700, Shaun wrote:
> 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?
> 

Re: newer domU older hypervisor?

[Keir Fraser]

On 1 Aug 2006, at 15:21, Andrew D. Ball wrote:

> Unfortunately, I think you are likely to have issues here.  You may 
> have
> luck having things at least work for basic functionality, but you
> definitely need to match the hypervisor and dom0 kernel w/ the tools.
>
> IMHO, it's a snafu to upgrade para-virtualized domU kernels that needs
> to be addressed better.

We are now trying to ensure that we maintain forward compatibility (new 
domU, old hypervisor). We already guarantee the other way round since 
3.0.0.

  -- Keir