On 18/04/17 01:48 PM, Jason Gunthorpe wrote: > I think this is why progress on this keeps getting stuck - every > solution is a lot of work. Yup! There's also a ton of work just to get the iomem safety issues addressed. Let alone the dma mapping issues. > You could try to do a dummy mapping / create a MR early on to detect > this. Ok, that could be a workable solution. > FWIW, I wonder if from a RDMA perspective we have another > problem.. Should we allow P2P memory to be used with the local DMA > lkey? There are potential designs around virtualization that would not > allow that. Should we mandate that P2P memory be in its own MR? I can't say I understand these issues... Logan
