Messages in this thread | | | From | Logan Gunthorpe <> | Date | Tue, 18 Apr 2017 14:06:14 -0600 | Subject | Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory |
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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
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