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SubjectRe: Question about iommu on x86 64 and ra deon driver.
> The DRM code is not used anymore. It was used by XFree86 but nowadays
> the TTM code is used instead.

I see

> Ah, this would be a lengthy writeup.. so did you look at the
> link I pointed you to?

Yes I have started, but do not understand everything yet.

What are MFNs? Is this something Xen-specific?

An does your post imply that on bare metal with "swiotlb=force
alloc_page with GFP_DMA32 does also not allocate under 4GB?

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