Re: [Qemu-devel] [PATCH 2/6] PCI DMA API

[Avi Kivity]

Anthony Liguori wrote:
> > This looks like it wouldn't scale to handle the Sparc systems. There
> > we want to make more translation steps from DVMA addresses to physical
> > in DMA controller and IOMMU and only in the final stage to void *. To
> > handle this, probably there should be an opaque parameter and some way
> > to register the translation function. Otherwise the API looks OK.
> >   
>
> I think having the PCI DMA API translate PhysIOVector => PhysIOVector 
> would help.  Then it becomes pretty easy to just call the DMA 
> controller for additional translation from the IOMMU.
>
> Does that sound right?  I don't quite understand what role the opaque 
> parameter would serve.

State for the dma controller.

I think Blue is calling for chaining of dma mappings, no?  Something 
similar is being proposed for the Linux dma api.


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