It has occurred to me that the recent vPCI-related discussion about
hidden devices has some relevance also elsewhere. In the course of
addressing review comments of what is now patch 1 I then came to
notice yet another quirk.

1: VT-d: consider hidden devices when unmapping
2: VT-d: PCI segments are up to 16 bits wide
3: AMD/IOMMU: consider hidden devices when flushing device I/O TLBs

Jan