On Sun, 2017-04-16 at 08:53 -0700, Dan Williams wrote: > > Just thinking out loud ... I don't have a firm idea or a design. But > > peer to peer is definitely a problem we need to tackle generically, the > > demand for it keeps coming up. > > ZONE_DEVICE allows you to redirect via get_dev_pagemap() to retrieve > context about the physical address in question. I'm thinking you can > hang bus address translation data off of that structure. This seems > vaguely similar to what HMM is doing. Ok, that's interesting. That would be a way to handle the "lookup" I was mentioning in the email I sent a few minutes ago. We would probably need to put some "structure" to that context. I'm very short on time to look into the details of this for at least a month (I'm taking about 3 weeks off for personal reasons next week), but I'm happy to dive more into this when I'm back and sort out with Jerome how to make it all co-habitate nicely with HMM. Cheers, Ben.
