linux-kernel - Re: Xen & VMI?

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Message-ID: <20070306211105.GD26348@elte.hu>
Date:	Tue, 6 Mar 2007 22:11:05 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	"Nakajima, Jun" <jun.nakajima@...el.com>,
	virtualization <virtualization@...ts.osdl.org>,
	Roland McGrath <roland@...hat.com>,
	Anthony Liguori <anthony@...emonkey.ws>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Jan Beulich <jbeulich@...ell.com>
Subject: Re: Xen & VMI?

* Jeremy Fitzhardinge <jeremy@...p.org> wrote:

> If you're seriously talking about an ABI, [...]

HELLO, this isnt a hypothetical!! The moment there's a xen_paravirt_ops, 
Linux has DE FACTO committed itself to the Xen ABI: whatever 
functionality the hypercall_page call table plus the int $0x82 interface 
offers.

THE MOMENT any of that goes upstream and ships in a distro it's going to 
be there forever! Try to change paravirt_ops or any core bit of Linux so 
that this ABI cannot be sanely supported: 'fix it, you broke Xen!'. It 
wont matter that paravirt_ops is 'internal' to Linux.

so trying to argue as if there was no ABI imposed on Linux by hiding the 
Xen ABI behind paravirt_ops, and whistling into the air as if nothing 
happened is misguided at best.

	Ingo
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