Re: [Xen-devel] [User Question] KVM and VirtualBox in Xen Dom0

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Thu, Sep 20, 2012 at 10:03:43AM +0200, Lukas Laukamp wrote:
> >
> >I think it *might* be possible when Xen PVH (Hybrid) is merged to
> >Xen 4.3,
> >which basically allows running Xen dom0 in HVM container.
> >
> >-- Pasi
> 
> Hello,
> 
> I googled for xen Hybrid, but have question if I understand it
> correct. Now the Dom0 is a PV Guest.
>

Correct.

> With Xen Hybrid the Dom0 can run as a HVM with PV features on the hypervisor.
>

PVH dom0 is basicly PV dom0 in HVM container. It's more PV than HVM.

> This would make it possible because of nested virtualization that KVM and 
> VirtualBox
> run inside dom0 right?
> 

Yes, but PVH doesn't enable nested virt automatically, that'll require some 
extra patches.

> And my second question would be: Is the aim of Xen hybrid to bring
> Dom0 support to more OSes?
> 

The purpose of PVH dom0 is to be able to utilize HAP (Hardware Assisted Paging) 
in dom0, and also lowering syscall overhead for 64bit dom0.

So it's about optimizations.
See Mukesh's presentation about PVH/Hybrid from XenSummit North America 2012.

-- Pasi


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