From mboxrd@z Thu Jan  1 00:00:00 1970
From: Wei Wang <wei.wang2@amd.com>
Subject: Re: Xen BUG at pci_amd_iommu.c:33
Date: Fri, 17 Aug 2012 14:10:22 +0200
Message-ID: <502E34AE.9030105@amd.com>
References: <1345203982.10161.11.camel@zakaz.uk.xensource.com>
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To: Ian Campbell <Ian.Campbell@citrix.com>
Cc: 684661@bugs.debian.org, xen-devel <xen-devel@lists.xen.org>
List-Id: xen-devel@lists.xenproject.org

On 08/17/2012 01:46 PM, Ian Campbell wrote:
> Hi Wei,
>
> A Debian user has hit this message and reported it in
> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=684661
>
> I think it is the BUG_ON in:
>          struct amd_iommu *find_iommu_for_device(int bdf)
>          {
>              BUG_ON ( bdf>= ivrs_bdf_entries );
>              return ivrs_mappings[bdf].iommu;
>          }
>
> It looks like ivrs_bdf_entries comes from ACPI. Unfortunately the bug
> report is a bit vague about things like stack traces etc so it's hard to
> say where BDF came from.
>
> Any ideas? I'll also follow up to the submitter to try and get some more
> details.

It difficult to identify the issue from the description and I think a 
full serial boot log would be great. Also using iommu=debug as boot 
option is very helpful to get more information.

Thanks,
Wei

> Ian.
>
>
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