linux-kernel - Re: ABI coupling to hypervisors via CONFIG

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Message-ID: <Pine.LNX.4.64.0703091305090.10832@woody.linux-foundation.org>
Date:	Fri, 9 Mar 2007 13:06:47 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Zachary Amsden <zach@...are.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	john stultz <johnstul@...ibm.com>, akpm@...ux-foundation.org,
	LKML <linux-kernel@...r.kernel.org>,
	Rusty Russell <rusty@...tcorp.com.au>, Andi Kleen <ak@...e.de>,
	Chris Wright <chrisw@...s-sol.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: ABI coupling to hypervisors via CONFIG_PARAVIRT



On Fri, 9 Mar 2007, Ingo Molnar wrote:
>
>   _new kernel must not break on an older hypervisor_

Total red herring. AGAIN.

The paravirt_ops isn't a 1:1 hypervisor ABI.

If we change paravirt_ops to be higher-level ops (as we should), yes, the 
paravirt->VMI layer needs to be extended to have the "higher->lower" 
translation. But at no point did we break the hypervisor.

Anyway, please don't even bother cc'ing or replying to me any more.

		Linus
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