On Fri, Jul 17, 2020 at 03:15:43PM +0000, Sironi, Filippo wrote:
> I don't believe that we want to trust a userspace driver here, this may
> result in hosts becoming unstable because devices are asked to do things
> they aren't meant to do (e.g., DMA beyond 48 bits).

How is the hosts stability affected when a device is programmed with
handles outside of its DMA mask?

Anyway, someone needs to know how to use the device in the end, and this
entity also needs to know the DMA mask of the device and pass it down to
path to the dma-iommu code.



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