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Re: [Xen-devel] Xen inside Xen with VMX?

  • To: "Morten Hansen" <paradigm__82@xxxxxxxxxxx>
  • From: "pradeep singh rautela" <rautelap@xxxxxxxxx>
  • Date: Thu, 31 Jan 2008 16:39:09 +0530
  • Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Thu, 31 Jan 2008 03:09:36 -0800
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On 31/01/2008, Morten Hansen <paradigm__82@xxxxxxxxxxx> wrote:
>  Hello,
> out of curiosity, I was wondering if it is possible to support recursive
> emulation in Xen, i.e. if it is possible to have Xen as a guest in Xen
> (possibly with other guests inside those Xen's)? I'm particularly curious if
> this is possible when running Xen using Intel's VT extensions (or AMD's
> Pacifica), i.e. do these enhancements provide the hypervisor with enough
> control that it can virtualize the virtualization enhancements themselves
> (without a prohibitive loss in performance)?

AFAIK I guess xen can still run inside a HVM guest. yes/no?
And therefore atleast can run PV guests over it, though i doubt HVM
guests will work too.

> If it's not possible I guess VT etc. doesn't really offer true emulation
> since the guest would be able to detect the emulation by noticing that it
> wasn't itself able to become a hypervisor.
> Thank you in advance!
> Best regards,
> MH
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Pradeep Singh Rautela

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