Re: [Xen-users] DomU as Dom0?

[Javier Guerra <javier@xxxxxxxxxxx>]

On Thu, Feb 11, 2010 at 2:54 PM, Stefan Kuhne <stefan.kuhne@xxxxxxx> wrote:
>> So that This DomU will act as a Dom0 for other DomU on top of it?
> No.

DomU's don't run 'on top of' Dom0.

Dom0 is a virtual machine, just like any DomU.  The only difference is
that the Xen hypervisor gives it direct access to the hardware and the
Xen controll API.  with that, some userlevel processes on Dom0 manage
shared resources access (mostly hard disk and network).

Any Dom started after the first one have reduced access, so it can't
fight Dom0; but it uses the very same hypervisor API, so it can use
(and usually do) the very same kernel as Dom0.  it doesn't give it any
extra powers.

Since the Xen hypervisor doesn't run on Dom0 (it's the other way
around), to get nested virtualizations, you would have to run a second
Xen hypervisor on top of the first hypervisor.  AFAIK, Xen hasn't been
ported to the PV API, it needs the full, real hardware.


-- 
Javier

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