linux-kernel - Re: 3.2rc1: bootup fails: DRHD: handling fault status reg 2

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Message-ID: <4EC1B80D.5000102@arndnet.de>
Date:	Tue, 15 Nov 2011 01:53:33 +0100
From:	Arnd Hannemann <arnd@...dnet.de>
To:	linux-kernel@...r.kernel.org
CC:	dwmw2@...radead.org, iommu@...ts.linux-foundation.org
Subject: Re: 3.2rc1: bootup fails: DRHD: handling fault status reg 2

Hi,

Am 14.11.2011 23:33, schrieb Arnd Hannemann:

> when trying to boot kernel 3.2rc1 on my thinkpad t510 I get an endless loop of errors:
> 
>  DRHD: handling fault status reg 2
>  DMAR: [DMA Read] Request device [0d:00.0] fault addr fffff000
>  DMAR: [fault reason 02] Present bit in context entry is clear
> 
> screenshot can be found here:
> http://arndnet.de/lkml/screenshot3.2rc1.jpg
> 
> kernel 3.1.1 is booting up flawlessly.

I must have inadvertently enabled CONFIG_INTEL_IOMMU_DEFAULT_ON in my config
for 3.2-rc1.

With disabled CONFIG_INTEL_IOMMU_DEFAULT_ON my thinkpad boots up again.
Not sure if this is expected?

Best regards
Arnd
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