Re: [Xen-devel] Xen BUG at pci_amd_iommu.c:33

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2012-08-17 at 13:10 +0100, Wei Wang wrote:
> 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, I've added that to my request to the submitter.

Ian.



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