> >>(and I think it mostly already doesn't even without that)
> >
> >It uses /sys/bus/pci/* which is not any better as seen from the IOMMU.
> >
> >Any interface will need to be explicit because user space needs to know 
> >which
> >DMA addresses to put into the hardware. It's not enough to just 
> >transparently
> >translate the mappings.
> 
> that's what DRM is used for nowadays...

But DRM does support much less hardware than the X server?

Perhaps we just need an ioctl where an X server can switch this.

-Andi

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