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RE: [Xen-devel] Integrate kqemu emulation into xen hypervisor possible?

To: "Samuel Thibault" <samuel.thibault@xxxxxxxxxxxxx>, "Ross S. W. Walker" <rwalker@xxxxxxxxxxxxx>
Subject: RE: [Xen-devel] Integrate kqemu emulation into xen hypervisor possible?
From: "Dan Magenheimer" <dan.magenheimer@xxxxxxxxxx>
Date: Tue, 1 Apr 2008 10:50:36 -0600
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> Ross S. W. Walker, le Tue 01 Apr 2008 11:41:24 -0400, a écrit :
> > Samuel Thibault wrote:
> > > Ross S. W. Walker, le Tue 01 Apr 2008 11:19:35 -0400, a écrit :
> > > > I was wondering if now that the kqemu source has been 
> GPL'd if it was
> > > > possible if it's functionality could be incorporated 
> into the Xen
> > > > hypervisor to provide full virtualization on hardware 
> that doesn't
> > > > support it?
> > >
> > > What would be the benefit, compared to just running qemu in
> > > user space?
> Oooh, oops, you are talking about *k*qemu, not qemu, sorry, ok, I see.
> Well, a first step would be to make kqemu work with Xen's dom0 Linux.
> Then, adding the feature in the Hypervisor may make sense indeed, but
> I'm not sure you'd get much bigger performance than with just the dom0
> support.

If I'm not misunderstanding, an interesting side effect of this
would be recursive virtual machines, e.g. Xen could run Xen running
an hvm.

Who cares about such a thing in the real world, you ask?
Probably not particularly useful in production, but it
would be useful in education and debugging.

On the other hand, kqemu isn't really needed for that, just full
emulation of the VT instruction set, correct?

What kqemu-in-xen *could* be used for would be running x86 VMs on
a non-x86 architecture! (Insert shameless plug for googling
MagiXen here :-)


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