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xen-ia64-devel
Re: [Xen-devel] VP problematic for backend drivers on IA64?
On Tue, Jan 24, 2006 at 04:02:36PM -0800, Magenheimer, Dan (HP Labs Fort
Collins) wrote:
> Actually, after thinking about this, it's a bit
> more complicated because of the possibility that a DMA may
> address more than one page. If so, a simple DMA may need to be
> translated into a scatter-gather (or a scatter-gather into
> a more complex scatter-gather).
>
> Not impossible, obviously because Xen/x86 handles this -- by
> changing Linux, correct?
Correct. Specifically, it's handled by Xen's version of swiotlb.c.
> Do hardware IOMMU's in general handle this complication?
Yes. You can use a HW IOMMU to map a scatter-gather list of machine
pages into a contigous range in the IO space. It can also do the
reverse, but that's less interesting.
> E.g. is there a cleanly defined interface that can be applied
> to a VP domain "Xen IOMMU"?
I'm not sure what you're asking here?
Cheers,
Muli
--
Muli Ben-Yehuda
http://www.mulix.org | http://mulix.livejournal.com/
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