I've run  KVM  VMs  ontop  oVirt Guest.  Are  you sure that the Nested  
Virtualization is your problem  ?
Best Regards,
Strahil Nikolov

На 29 юли 2020 г. 23:33:48 GMT+03:00, tho...@hoberg.net написа:
>I tried using nested virtualization, too, a couple of weeks ago.
>I was using a 3 node HCI CentOS 7.8 cluster and I got pretty far.
>Configuring KVM to work with nested page tables isn't all that well
>documented but I got there, I even installed some host extensions, that
>seem requried.
>Even the actual nesting, that is a VM run inside a VM did work, the
>setup came to the point where it ran the hosted engine on temporary
>local storage, before it's picked up, fixed up to run on the Gluster
>storage and restarted there. But that process failed eventually,
>evidently because the overlay network doesn't support nesting. Where
>the initial hosted engine is using a local bridge with the (in this
>case virtual) host--and that works--afterwards it's using the overlay
>network and that evidently doesn't.
>It was only then when I ran across a very obscure message somewhere in
>this mailing list, that oVirt on top of oVirt in fact does not work at
>all! Up to that point it just wasn't "supported".
>When a hypervisor producer speaks of nested virtualization support, I
>would understand it to mean that you can run their product under their
>product, ideally also somebody else's product. I've run ESX on VMware
>workstation and that was pretty cool.
>In the case of oVirt from what I have gathered (and I'd love to be
>wrong), it is supposed to only mean that you can run oVirt on top of
>Not the other way around, nor in any other way most likely.
>To me that looks much more like an internal Redhat development
>facility, than a product feature.
>Of course I mostly wish they'd find a way to make it work like it does
>on VMware.
>But next on my wishlist would be an explicit description of what does
>and what doesn't work.
>This way it was almost a week of a me against the computer adventure
>where I lost.
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