RE: [Xen-users] RE: [Xen-devel] DomU as Dom0?

["Dong, Eddie" <eddie.dong@xxxxxxxxx>]

Javier Guerra wrote:
> On Mon, Feb 15, 2010 at 11:32 AM, Dong, Eddie <eddie.dong@xxxxxxxxx>
> wrote: 
>>>> It's called "nested virtualization" (not recursive) and there was a
>> 
>> It is just a name difference. It is actually recursivable as if the
>> CPU is power enough. 
> 
> not if (as in this case) you use different requirements for each
> virtualization level.  the 'real' level needs HVM support to set an
> HVM DomU, where you can run Xen, but this level doesn't have HVM, so
> you can only put PV DomU's there.

You can distinguish in this way.  The term "nested" actually comes from KVM 
side by Alexander Graf, though I don't know why he chooses nested rather than 
recursive.

What the Xen summit talked and we were approaching is exactly recursive 
virtualization.

> 
> The KVM on KVM experiments are closer to being fully recursive.

Yes.

Eddie


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