Why is that? I haven't looked at how one actually programs an IOMMU. Is it a fundamental limitation or some sort of "we can't break existing devices relying on being able to read/write anywhere"?
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Yes, you need to use bounce buffers for the first/last pages when that happens. That is expected. Userspace that wants performance needs to align.
There is a distinction here between e.g. standard socket APIs (you pretty much always need to copy anyway) and high performance stuff where userspace should know what it's doing. Same with graphics, ultimately GPU contexts can 1:1 map userspace contexts for stuff like games.
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(and this is how it's done for secure game consoles, by the way, which are optimized for security *and* GPU perf)
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Also for cloud network adapters that use SRIOV
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