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xen-devel
[Xen-devel] Re: [bisected] 2.6.31 regression: fails to boot as xen guest
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To: |
Pekka Enberg <penberg@xxxxxxxxxxxxxx> |
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Subject: |
[Xen-devel] Re: [bisected] 2.6.31 regression: fails to boot as xen guest |
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From: |
Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
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Date: |
Tue, 25 Aug 2009 12:31:52 -0700 |
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Cc: |
"xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Arnd Hannemann <hannemann@xxxxxxxxxxxxxxxxxxx>, Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, "hannes@xxxxxxxxxxx" <hannes@xxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxx>, "torvalds@xxxxxxxxxxxxxxxxxxxx" <torvalds@xxxxxxxxxxxxxxxxxxxx>, Arnd Hannemann <Arnd.Hannemann@xxxxxxxxxxxxxxxxxxx> |
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Delivery-date: |
Tue, 25 Aug 2009 12:32:14 -0700 |
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<1251225834.13451.13.camel@penberg-laptop> |
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<4A9407B1.6020400@xxxxxxxxxxxxxxxxxxx> <84144f020908250929t7d4a74f1n4827de04e5c4c56a@xxxxxxxxxxxxxx> <4A94161A.2020609@xxxxxxxxxxxxxxxxxxx> <1251219129.4852.1.camel@penberg-laptop> <4A94242E.30309@xxxxxxxxxxxxxxxxxxx> <1251223399.13451.5.camel@penberg-laptop> <4A942BDD.70303@xxxxxxxxxxxxxxxxxxx> <20090825182510.GA6903@xxxxxxx> <4A942DB9.3020209@xxxxxxxx> <4A942F96.7000900@xxxxxxxxxxxxxxxxxxx> <1251225834.13451.13.camel@penberg-laptop> |
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Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.1) Gecko/20090814 Fedora/3.0-2.6.b3.fc11 Lightning/1.0pre Thunderbird/3.0b3 |
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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