Re: [Xen-users] Hyper V with Xen

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Mon, 2012-04-16 at 14:53 +0100, Andrew Bobulsky wrote:
> Hello Dominik,
> 
> Your question got me a little curious, because I know that Hyper-V is
> a bit of a stickler for hardware requirements.  A bit of light
> googling and link crawling turned up this:
> http://www.virtuallyghetto.com/2011/07/how-to-enable-support-for-nested-64bit.html
> 
> I laughed a little bit when he referred to the nested VMs as
> "Inception."  Great movie :D
> 
> It seems as though what you want to do will require hardware VT
> translation on the part of the hypervisor (software virtualization of
> hardware virtualization?  That makes my brain explode a little!).  It
> *can* work, but maybe the devs can speak as to whether or not the
> feature exists, or at least tell you what its "properly" called.  I'm
> guessing that VMware calls it "VHV," probably short for "Virtualized
> Hardware-assisted Virtualization."  Or something.  Hehe.

This is called "nested virtualisation" and will be an experimental
feature in the upcoming 4.2 release. 

I've seen some reports of it running uniprocessor Hyper-V on AMD
hardware, however there are some known issues with it and testing has
not been extensive (hence experimental). See <4F5F323D.1020904@xxxxxxx>
(on xen-devel) for the situation with Nested-SVM, I'm not aware of any
similar list for nested VMX.

Please check the xen-devel archives for this year, in particular the
"Nested SVM" thread referenced above and the entries on the weekly "4.2
TODO" mails (and their sub-threads).

Ian.

> 
> Cheers,
> Andrew Bobulsky
> 
> On Mon, Apr 16, 2012 at 9:00 AM, Dominik Lange <Trilab@xxxxxx> wrote:
> > Hi all,
> >
> > i have a question about Xen Hypervisor. Im a beginner in this area and sry 
> > if my question are stupid or something :-)
> >
> > For a project i will use Xen Hypervisor and Windows Server 2008 R2 with 
> > Hyper2.
> >
> > My question is:
> >
> > Can i use Hyper-V in a Xen-based VM, so as a VM in a VM (Cause Hyper-V 
> > needs VT)?I looked in the documentation and use google but i find nothing.
> >
> > I would be very grateful for help! :-)
> >
> > Best regards,
> >
> > Dominik
> > --
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> >
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> 
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