On Mon, Oct 02, 2017 at 03:56:14PM +0100, Robin Murphy wrote:
> IIRC, dmabounce has to stay because it handles non-contiguous DMA masks,
> thanks to a StrongARM hardware erratum where the DMA controller could
> only access every other megabyte of memory (or something like that).

Isn't that exactly the problem that xen-swiotlb solves?
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