Re: [Xen-users] compatibility questions

[Christopher Vance <c@xxxxxx>]

On Thu, Jun 22, 2006 at 12:49:24PM +0200, Goetz Bock wrote:
> On Thu, Jun 22 '06 at 20:29, Christopher Vance wrote:
> > (1) If I install Xen3, can I run a client OS which was modified for
> > Xen2 (I believe Plan9 didn't get updated to 3 yet)?
> No.
Perhaps the faq should say this?  I will need to decide which version
to install based on my intended client OSs.  Or maybe I'll need to
install both 2 and 3.

Is there any commitment that Xen3 clients will run on Xen4?  Or does
development require that everything has to become breakable at certain
points?

> > (2) If I install a 64bit version, must all clients be 64bit OSs, or
> > can I run mixed 64 and 32 bit stuff on an amd64?
> No.
>
> With linux you can run 32bit userspace using a 64bit kernel on a 64bit
> Xen hypervisor.
I actually meant 'do all my client kernels have to be 64bit'?

I think your answer is
* yes, all kernels do have to be 64bit, and that running 32bit stuff
depends only on whether the client kernel can handle it, and has
nothing to do with Xen at all; and therefore
* if my Xen is amd64, I won't be able to run an i686 client kernel on
it.

Thanks for your response.  I'll need to do some thinking before I can
decide exactly which way to proceed.

--
Christopher Vance

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