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Re: [Xen-users] Running Xen on top of Xen

from [jim burns]

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Subject:	Re: [Xen-users] Running Xen on top of Xen
From:	jim burns <jim_burn@xxxxxxxxxxxxx>
Date:	Tue, 29 Jan 2008 21:00:41 -0500
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On Tuesday 29 January 2008 01:44:04 pm Rick Strong wrote:
> I was wondering if anyone has run Xen on top of Xen in the following
> scenarios and did it work:
>
> 1) Xen-Paravirtualized on top of Xen Intel-VT (I hope this would work
> out of the box)
> 2) Xen Intel-VT on top of Xen-Paravirtualized (I don't think this would
> work out of the box)

You can't load the xen hypervisor inside a PV guest, which would be necessary 
to get 2) to work. Even if you could run the hypervisor inside an hvm guest 
to get 1) to work, I would suspect the performance would be abysmal. I tried 
loading WIndows Virtual PC 2007 inside my Xen WIndows XP guest. The 
configuration steps worked fine, but as soon as I tried to run the Virtual PC 
guest, my Xen Windows guest became unresponsive. (Maybe Xen/qemu-dm was 
trying to emulate every instruction of the Virtual PC guest? :-) Some people 
on this list report being able to run Xen under Vmware.

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