Re: [Xen-users] xen-on-xen

[Mark Williamson <mark.williamson@xxxxxxxxxxxx>]

I used Xen PV inside Xen HVM for a lot of earlier XenFS development work.  
It's a bit of a nasty hack though and given the typical response seems to be 
"Heh, that works, does it?" I don't think it's considered a "supported 
configuration" ;-)

Cheers,
Mark

On Tuesday 03 March 2009 17:31:47 Jeff Lane wrote:
> On Mon, Mar 2, 2009 at 9:23 AM, Heli <helicoterus-elih@xxxxxxxx> wrote:
> > An hypervisor is able to run in a virtual machine if hypervisor
> > construction and copmuter architecture meet the second Popek's and
> > Goldberg's theorem (about recursive virtualization).
> > Xen does not meet it, because x86 architecture is not a "perfect"
> > virtualizable one.
>
> As has been said... yes you can.  It's not pretty, and certainly not
> recommended.  I've done it before using RHEL 5 and Xen running an
> additional RHEL 5 HVM guest with Xen in that.  It's certainly ugly,
> and incredibly slow, but you can at least log in and use it.
>
> Now, that being said, would I try that "in the real world": absolutely not.
> Would I use that in your case of testing customer backups: No way...
>
> Sure it works, but it doesn't work well, and I would not trust that to
> verify a customer scenario.  Best bet would be for you to buy a couple
> spare servers and use those to verify Xen... hell, charge the customer
> an extra fee for the hardware required to verify their backups, if you
> can.
>
> For what it's worth, I HAVE gotten this to work before:
>
> RHEL 5 / Xen Host -> RHEL 5 /Xen HVM guest -> rhel 5 PV domU
>
> And like I said, it was UGLY, and barely usable... but at least in the
> abstract sense, it does work... :-)
>
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