On Thu, Jan 25, 2018 at 09:08:48AM -0700, Jason Gunthorpe wrote:
On Wed, Jan 24, 2018 at 11:02:16PM -0800, Dan Williams wrote:
> No, in 3 dimensions since there is a need to support non-ODP RDMA
> hardware, hypervisors want to coordinate DMA for guests, and non-RDMA
> hardware also pins memory indefinitely like V4L2. So it's bigger than
> RDMA, but that will likely be the first consumer of this 'longterm
> pin' mechanism.
BTW, did you look at VFIO? I think it should also have this problem
VFIO seems to have the same issue. In practice I don't think people
use file system backed pages for vfio, so it's not as urgent.