linux-kernel - Xen & VMI?

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Date:	Tue, 6 Mar 2007 09:19:09 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Zachary Amsden <zach@...are.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	virtualization <virtualization@...ts.osdl.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Roland McGrath <roland@...hat.com>, Andi Kleen <ak@...e.de>,
	linux-kernel@...r.kernel.org, Jan Beulich <jbeulich@...ell.com>
Subject: Xen & VMI?

btw., while we have everyone on the phone and talking ;) Technologically 
it would save us a whole lot of trouble in Linux if 'external' 
hypervisors could standardize around a single ABI - such as VMI. Is 
there any deep reason why Xen couldnt use VMI to talk to Linux? I 
suspect a range of VMI vectors could be set aside for Xen's dom0 (and 
other) APIs that have no current VMI equivalent - if there's broad 
agreement on the current 60+ base VMI vectors that center around basic 
x86 CPU capabilities - which make up the largest portion of our 
paravirtualization complexity. Pipe dream?

there are already 5 major hypervisors we are going to support (in 
alphabetical order):

 - KVM
 - lguest
 - Windows
 - VMWare
 - Xen

the QA matrix is gonna be a _mess_. Okay, lguest and KVM is special 
because both the client and the server side is in the same source code, 
so the ABI [if any] is alot easier to manage. That still leaves another 
three...

	Ingo
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