Re: [Xen-devel] IOMMU fault with IGD passthrough setup on XEN 4.8.0

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 16.01.17 at 16:21, <firemeteor@xxxxxxxxxxxxxxxxxxxxx> wrote:
> BTW, before I generate more verbose && complete debug log, just want to
> update that I also see the following in dom0 (without attempting any
> pass-through to the IGD device)
> But this time the log is not flooding at all. Not sure if this is relevant
> to what I see from the domU with pci pass-through.
> 
> (XEN) Bogus DMIBAR 0xfed18001 on 0000:00:00.0
> (XEN) [VT-D]DMAR:[DMA Write] Request device [0000:00:02.0] fault addr
> 7300000000, iommu reg = ffff82c000201000
> (XEN) [VT-D]DMAR: reason 05 - PTE Write access is not set
> (XEN) [VT-D]DMAR:[DMA Write] Request device [0000:00:02.0] fault addr
> 7300000000, iommu reg = ffff82c000201000
> (XEN) [VT-D]DMAR: reason 05 - PTE Write access is not set
> (XEN) [VT-D]DMAR:[DMA Write] Request device [0000:00:02.0] fault addr
> 7300000000, iommu reg = ffff82c000201000
> (XEN) [VT-D]DMAR: reason 05 - PTE Write access is not set
> (XEN) [VT-D]DMAR:[DMA Write] Request device [0000:00:02.0] fault addr
> 7300000000, iommu reg = ffff82c000201000
> (XEN) [VT-D]DMAR: reason 05 - PTE Write access is not set
> (XEN) [VT-D]DMAR:[DMA Write] Request device [0000:00:02.0] fault addr
> 7300000000, iommu reg = ffff82c000201000
> (XEN) [VT-D]DMAR: reason 05 - PTE Write access is not set

This address is clearly neither RAM nor covered by any RMRR, so
the question is why there is I/O being generated to it. Is it perhaps
named by one of the device's BARs?

Jan


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