linux-kernel - Re: [PATCH 1/3] iommu/amd: Add logic to decode AMD IOMMU event flag

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Message-ID: <515AFC25.5060501@amd.com>
Date:	Tue, 2 Apr 2013 10:41:25 -0500
From:	Suravee Suthikulpanit <suravee.suthikulpanit@....com>
To:	Borislav Petkov <bp@...en8.de>, Joerg Roedel <joro@...tes.org>,
	<iommu@...ts.linux-foundation.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] iommu/amd: Add logic to decode AMD IOMMU event flag

On 4/2/2013 10:29 AM, Borislav Petkov wrote:
> On Tue, Apr 02, 2013 at 05:03:04PM +0200, Joerg Roedel wrote:
>> On Tue, Apr 02, 2013 at 04:40:37PM +0200, Borislav Petkov wrote:
>>> While you guys are at it, can someone fix this too pls (ASUS board with
>>> a PD on it).
>>>
>>> [    0.220342] [Firmware Bug]: AMD-Vi: IOAPIC[9] not in IVRS table
>>> [    0.220398] [Firmware Bug]: AMD-Vi: IOAPIC[10] not in IVRS table
>>> [    0.220451] [Firmware Bug]: AMD-Vi: No southbridge IOAPIC found in IVRS table
>>> [    0.220506] AMD-Vi: Disabling interrupt remapping due to BIOS Bug(s)
>> That is actually a BIOS problem. I wonder whether it would help to turn this
>> into a WARN_ON to get the board vendors to release working BIOSes.
>> Opinions?
> Good luck trying to get ASUS to fix anything in their BIOS :(.
I have tried to contact Asus in the past to have them fix the issue, but 
I got no luck.  Once it is out in the field, it's very difficult to get 
them to make changes.  I am also addressing this issue with the BIOS 
team for the future hardware.

Turning this into WARN_ON() at this point might break a lot of systems 
currently out in the field.  However, users can always switching to use 
"intremap=off" but this might not be obvious.

Suravee

> Can't we detect the SB IOAPIC some other way in this case?
>


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