linux-kernel - Re: hardwired VMI crap

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Date:	Thu, 08 Mar 2007 16:44:17 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	tglx@...utronix.de
CC:	Ingo Molnar <mingo@...e.hu>, Zachary Amsden <zach@...are.com>,
	john stultz <johnstul@...ibm.com>, akpm@...ux-foundation.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Pratap Subrahmanyam <pratap@...are.com>,
	Rusty Russell <rusty@...tcorp.com.au>, Andi Kleen <ak@...e.de>,
	Daniel Hecht <dhecht@...are.com>,
	Daniel Arai <arai@...are.com>,
	Chris Wright <chrisw@...s-sol.org>,
	Virtualization Mailing List <virtualization@...ts.osdl.org>
Subject: Re: hardwired VMI crap

Thomas Gleixner wrote:
> Once you are there, you are near the point where you created a virtual
> architecture, which could run on any real architecture which gets
> supported by a hypervisor backend.
>
> I'd love that :)
>   

Sure.  But not even hypervisors.  Once we sort out pv_ops's SMP support,
it will be this >< close to covering everything in the subarch
interface.  So we can drop all that goo in favour of paravirt_ops, and
make a single kernel that will boot on everything from voyager to
numa-q!  How's that for world peace?

> I know it is tricky to combine this with the upcoming hardware
> virtualization support. But it's at least a worthwhile thought
> experiment.
>   

Well, in many ways that's a step backwards.  The upside is that its
easier to get away with simply emulating the some particular piece
hardware, but it does lose a lot of opportunities for interesting
flexibility and optimisations.

But I anticipate we'll get a xen-hvm pv_ops backend, for running under
Xen with a virtualizing cpu.  It will probably look a lot like kvm's
pv_ops backend.

    J

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