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>  > as well, when doing large allocs and the IOMMU is full you return a
> > full 64 bit address.
>
> And when the IOMMU is "full" what happens to all the SAC only
> cards in the machine? pci_map_{single,sg}() are not allowed
> to fail.

Thats something we already know has to be fixed. Its true with or without
an IOMMU that there may be cases where there is no free mapping space

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