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?