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Re: [Xen-devel] nested virtualization: xen-on-xen

To: Christoph Egger <Christoph.Egger@xxxxxxx>
Subject: Re: [Xen-devel] nested virtualization: xen-on-xen
From: Tim Deegan <Tim.Deegan@xxxxxxxxxx>
Date: Fri, 1 Jul 2011 10:43:53 +0100
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At 11:35 +0200 on 01 Jul (1309520148), Christoph Egger wrote:
> You report that you can boot Xen 4.0 on Xen-unstable but not
> Xen 4.1 or Xen-unstable on Xen-unstable, right?

I have two firm datapoints: 32-bit 4.0 (as shipped in Debian Squeeze)
works OK; 64-bit xen-unstable with a 64-bit debian testing kernel fails.
I tried some other configurations but don't remember the details.

> I suppose the problem is that the l1 Dom0 hangs at boot.

The problem I saw was that during n1 dom0 boot the screen would go black
and the cpu usage hit 100%.  Sampling the vCPU state showed plausible
hypercalls being made and it didn't seem to be stuck in one particular

> Attached patch fixes this problem for me. Please give it a try.

Thanks.  I tried this patch and it made no difference, though it's
possible that I slipped up somewhere installing the new libxc.

If I get time next week I'll dig into it further. 



Tim Deegan <Tim.Deegan@xxxxxxxxxx>
Principal Software Engineer, Xen Platform Team
Citrix Systems UK Ltd.  (Company #02937203, SL9 0BG)

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