On 26/03/18 01:35 PM, Jason Gunthorpe wrote: > I think this is another case of the HW can do it but the SW support is > missing. IOMMU configuration and maybe firmware too, for instance. Nope, not sure how you can make this leap. We've been specifically told that peer-to-peer PCIe DMA is not supported on P9. We've also been told there is a very limited (ie. store only), low performance mode designed for poking mailboxes but it is disabled by default and must be enable with some kind of special firmware calls. Logan
