linux-kernel - Re: [bisected] 2.6.31 regression: fails to boot as xen guest

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Message-ID: <4A943C28.2040104@goop.org>
Date:	Tue, 25 Aug 2009 12:31:52 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Pekka Enberg <penberg@...helsinki.fi>
CC:	Arnd Hannemann <hannemann@...s.rwth-aachen.de>,
	Ingo Molnar <mingo@...e.hu>,
	Arnd Hannemann <Arnd.Hannemann@...s.rwth-aachen.de>,
	LKML <linux-kernel@...r.kernel.org>,
	"hannes@...xchg.org" <hannes@...xchg.org>,
	"torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [bisected] 2.6.31 regression: fails to boot as xen guest

On 08/25/09 11:43, Pekka Enberg wrote:
> Aha, the previous patch worked because I #ifdef the WP test completely.
> Jeremy, the root cause here is that we do the WP test much earlier than
> before. Even with the test moved to trap_init(), we do it early compared
> to what we did before.
>
> I guess Xen is not prepared to handle traps this early in the boot
> sequence? Can we fix that?
>   

The crash is in the event (interrupt) path, which shouldn't be involved
in trap handling at all.  I'm wondering if interrupts are getting
enabled as a side-effect of handling the trap.

    J
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