Re: [Intel IOMMU][patch 8/8] Preserve some Virtual Address when devices cannot address entire range.

[Roland Dreier]

 > My suggestion would be to allocate top-down in the 32-bit IOMMU space.

I think that's good for normal things, but it's not unreasonable to
want to map > 4 GB of memory at once for an Infiniband device.

So maybe we would want some heuristics about the size of the mapping
being requested or the amount of 32-bit space left to decide whether a
mapping should be below 4 GB.

 - R.
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