From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ingo Molnar <mingo@elte.hu>
Subject: Re: Xen & VMI?
Date: Tue, 6 Mar 2007 22:11:05 +0100
Message-ID: <20070306211105.GD26348@elte.hu>
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To: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: virtualization <virtualization@lists.osdl.org>, Jan Beulich <jbeulich@novell.com>, Anthony Liguori <anthony@codemonkey.ws>, Andrew Morton <akpm@linux-foundation.org>, Linus Torvalds <torvalds@linux-foundation.org>, linux-kernel@vger.kernel.org, Roland McGrath <roland@redhat.com>
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* Jeremy Fitzhardinge <jeremy@goop.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