Re: [PATCH v5 2/3] virtio_pci: Use the DMA API for virtqueues when possible

On Sat, 2014-09-20 at 22:48 -0700, Andy Lutomirski wrote:

I'm all for doing this as some kind of bus property, if needed,
although David Woodhouse may be right that the best solution is to
*always* have the IOMMU there and to just ask it for an identity map
if desired.

That's the right solution for x86, certainly. For POWER it's a little
less clear-cut because I don't think the IOMMU normally supports
identity mapping there. You could still do an identity mapping (hell, we
do at the moment) but it'd be a very special case.

-- 
dwmw2