linux-kernel - Re: [PATCH] paravirt.h

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Message-ID: <p73y7tg7cg7.fsf@verdi.suse.de>
Date:	22 Aug 2006 22:16:56 +0200
From:	Andi Kleen <ak@...e.de>
To:	Zachary Amsden <zach@...are.com>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	virtualization@...ts.osdl.org,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Andrew Morton <akpm@...l.org>,
	Chris Wright <chrisw@...s-sol.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] paravirt.h

Zachary Amsden <zach@...are.com> writes:
> 
> That is a really nasty problem.  You need a synchronization primitive
> which guarantees a flat stack, so you can't do it in the interrupt
> handler as I have tried to do.  I'll bang my head on it awhile.  In
> the meantime, were there ever any solutions to the syscall patching
> problem that might lend me a clue as to what to do (or not to do, or
> impossible?).

stop_machine_run() solves the problem I think. It is currently not 
exported though. I don't think there's anything in there that couldn't
be reimplemented in a module, but then we could also just export it
if there's a useful user.

-Andi
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