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

[Lukas Laukamp <lukas@xxxxxxxxxx>]

Am 2012-09-20 10:37, schrieb Pasi KÃrkkÃinen:
> 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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Hello,

thanks for our replies Fajar and Pasi. My questions are replied now. I 
thought it would be comfortable to have them all on one host, we will 
see whether it's possible in future with PVH.
Best Regards

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