Mailing List Archive: Xen: Users

Recursive Virtualization

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nico_stutz at web

May 15, 2012, 1:41 PM

Post #1 of 4 (286 views)
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Recursive Virtualization

Hallo everybody,

is it possible to migrate another VM (like LXC, OpenVZ, QEmu, KVM, VirtualBox, VMware or Xen itself,) on Xen. I would be very greatful, if you could share your experiences with me. I've never worked with Xen yet, but I'm really interested in it.

Thank you guys very much.
Nico

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nunomagalhaes at eu

May 20, 2012, 4:06 AM

Post #2 of 4 (237 views)
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Re: Recursive Virtualization [In reply to]

...What does that have to do with recursion (i think you would've
meant nested anyway)?
Don't you mean How to migrate VMs between different hypervisors?

Cheers,
Nuno

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borisq22 at gmail

May 20, 2012, 11:36 AM

Post #3 of 4 (240 views)
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Re: Recursive Virtualization [In reply to]

2012/5/20 Nuno Magalhães <nunomagalhaes [at] eu>:
> ...What does that have to do with recursion (i think you would've
> meant nested anyway)?
> Don't you mean How to migrate VMs between different hypervisors?
>
> Cheers,
> Nuno
>
> _______________________________________________
> Xen-users mailing list
> Xen-users [at] lists
> http://lists.xen.org/xen-users

The migration from Xen to Xen we all now it works. Also, I've done
migrations from VBox to Xen with some effort. So, if you're asking
that, the answer is Yes.

I still don't understand how is this related to !Recursion'...

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niuxinli1989 at gmail

May 20, 2012, 7:23 PM

Post #4 of 4 (253 views)
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Re: Recursive Virtualization [In reply to]

>
> Hallo everybody,
>
> is it possible to migrate another VM (like LXC, OpenVZ, QEmu, KVM,
> VirtualBox, VMware or Xen itself,) on Xen. I would be very greatful, if you
> could share your experiences with me. I've never worked with Xen yet, but
> I'm really interested in it.
>
> Thank you guys very much.
> Nico
>

I think you mean nested virtualization? Am I right? That means running a
hypersivor in a virtual machine.
AFAIK, this is almost impossible on a para-virtualized Xen virtual
machine.(Maybe qemu or bochs could work, I am not sure).
On a Xen HVM, most of these hypervisors could work, but without hardware
assitted virtualization technology, so KVM is excluded. For example, if you
run a Xen hypervisor in a Xen HVM, the hypersivor only supports
para-virtualized virtual machine.
VMware can fully support this feature as I have been tested. I heard Xen
4.2 is going to support it too. KVM on AMD also support this.
The performance of nested virtualization is really a problem. And it is
also hard to use the most-recent hardware virtualization technology for
nested virtualization. Our team is now using nested virtualization on
VMware Workstation just because we don't have enough physical machines. I
am also new to Xen and would like to hear the optinions from Xen experts.

Best Regards,
Xinli

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