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[Xen-devel] Re: [bisected] 2.6.31 regression: fails to boot as xen guest

To: Ingo Molnar <mingo@xxxxxxx>
Subject: [Xen-devel] Re: [bisected] 2.6.31 regression: fails to boot as xen guest
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Tue, 25 Aug 2009 11:30:17 -0700
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Arnd Hannemann <hannemann@xxxxxxxxxxxxxxxxxxx>, Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, Pekka Enberg <penberg@xxxxxxxxxxxxxx>, "hannes@xxxxxxxxxxx" <hannes@xxxxxxxxxxx>, Arnd Hannemann <Arnd.Hannemann@xxxxxxxxxxxxxxxxxxx>, "torvalds@xxxxxxxxxxxxxxxxxxxx" <torvalds@xxxxxxxxxxxxxxxxxxxx>
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On 08/25/09 11:25, Ingo Molnar wrote:
> * Arnd Hannemann <hannemann@xxxxxxxxxxxxxxxxxxx> wrote:
>> Pekka Enberg wrote:
>>> On Tue, 2009-08-25 at 19:49 +0200, Arnd Hannemann wrote:
>>>> Hi Pekka,
>>>> Pekka Enberg wrote:
>>>>> On Tue, 2009-08-25 at 18:49 +0200, Arnd Hannemann wrote:
>>>>>>> Thanks for doing the bisect! Can we also see your .config
>>>>>>> also?
>>>>>> Config for -rc7 is attached. My bisect configs were based on
>>>>>> that
>>>>> Thanks! While we wait for the Xen people, you can try the
>>>>> following patch to see if we can narrow the bug down to
>>>>> trap_init().
>>>> Yes seems to be trap_init(). -rc7 with this patch applied boots up
>>>> to the prompt.
>>> Thanks for testing! Ingo, what do you think of the following patch?
>>> AFAICT, x86-32 is the only architecture playing with traps in
>>> mem_init() so this should be the safest fix for 2.6.31.
>> Hmm, -rc7 + this fix does not work for me :-/
>> Still hangs before any output...
> does earlyprintk=vga tell you anything about precisely where it 
> hangs?

It's a Xen domain, so it should be earlyprintk=xen


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