Re: [PATCH V3] iommu/amd: Add logic to decode AMD IOMMU event flag

From: Borislav Petkov
Date: Mon Apr 08 2013 - 10:50:41 EST

On Mon, Apr 08, 2013 at 02:33:32PM +0000, Suthikulpanit, Suravee wrote:
> Joerg,
> Do you have any more feedback about this patch?
> Thanks,
> Suravee
> ________________________________________
> From: suravee.suthikulpanit@xxxxxxx [suravee.suthikulpanit@xxxxxxx]
> Sent: Tuesday, April 02, 2013 7:06 PM
> To: iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx; joro@xxxxxxxxxx
> Cc: linux-kernel@xxxxxxxxxxxxxxx; Suthikulpanit, Suravee
> Subject: [PATCH V3] iommu/amd: Add logic to decode AMD IOMMU event flag
> From: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
> Add logic to decode AMD IOMMU event flag based on information from AMD IOMMU specification.
> This should simplify debugging IOMMU errors. Also, dump DTE information in additional cases.
> This is an example:
> AMD-Vi: Event logged [IO_PAGE_FAULT device=51:00.0 domain=0x0000 address=0x0000000000000000 flags=0x0fff]
> AMD-Vi: Flags details: Guest NX=1 User Intr Present Write No-Perm Rsrv-Bit Translation
> AMD-Vi: Type of error: (0x7)
> AMD-Vi: (Note: Please refer to AMD IOMMU specification for details.)

Independent from Joerg's feedback on this, I have only one question:
you're not seriously considering on dumping this "Note:..." line above
on *every* IO-PF, right?

I very positively assume that people who stare at that output should, as
a first prerequisite, know where to find those fields' descriptions. :-)



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