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Re: [Xen-devel] VP problematic for backend drivers on IA64?

On 25 Jan 2006, at 16:46, Muli Ben-Yehuda wrote:

That's a good point. Since Xen provides its own "IOMMU" (swiotlb at
the moment), I think we should set PCI_DMA_BUS_IS_PHYS so that the
block layer never does bounce buffers on its own - unless doing it
there is more efficient?

We set it to zero if using swiotlb. I think setting it to zero disables driver-specific bounce buffer code?

As for drivers that don't use DMA - we only care about
para-virtualized drivers. I doubt we'll see any PV drivers where the
real drivers don't do DMA.

That's a big assumption that may only be 99.9% correct. :-)

 -- Keir

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