DragonFly BSD
DragonFly kernel List (threaded) for 2010-03
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Re: Port DragonFly to Xen platform

From: Magnus Eriksson <magetoo@xxxxxxxxxxx>
Date: Tue, 30 Mar 2010 11:46:19 +0200 (CEST)

On Mon, 29 Mar 2010, Freddie Cash wrote:

PV DomU support is "fairly easy",

Dom0 support is hard, and requires a lot of changes to the kernel, as you
are essentially adding a whole new CPU architecture (Xen).

Well, I come from NetBSD, so I don't really see the problem with doing that. Happens all the time. :-)

In the long-run, a KVM-like system where the DFly kernel becomes the
hypervisor and VMs run as user processes is better than the Xen split-dom,
"we're our own architecture, but we fake it using a real kernel" stuff.

It's really two different things entirely. Seems to me that with KVM, it is assumed that the host OS is given, and it provides a way to more easily virtualize guests; Xen puts itself in the center, and instead treats hosts and guests as exchangable. I like the idea that you can treat it as just another hardware architecture.

But as has been said before, KVM could benefit vkernels, and any other virtualization solution, so I can definitely see why that would be attractive.


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