> > > The mainstream kernel has a clean abstraction layer
> > > with the dma_ops that should be portable to Xen dom0
> > > and domU. I've started implementing this in a
> > > pci-dma-xen for x86_64 Xen Linux. Am I stepping on 
> > > anyone's toes or 
> > > is there anyone I should be co-ordinating this with?
>
> I think that using the dma_ops abstraction layer on x86_64 is 
> definitely the way to go. It's just not clear how the Xen 
> specific dma ops should be implemented in the end, whether 
> having a common implementation is worthwhile considering that 
> it will require glue code to make it fit with the different 
> interfaces.
I don't think there's enough differences between the bare
metal dma ops and the Xen dma ops to justify a common
implementation. Also, the common implementation implies
that each IOMMU interface needs to have some knowledge of
the other interfaces, and I don't think that's sustainable
long term.
-Mark Langsdorf
AMD, Inc.
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