> The NVMe fabrics stuff could probably make use of this. It's an
> in-kernel system to allow remote access to an NVMe device over RDMA. So
> they ought to be able to optimize their transfers by DMAing directly to
> the NVMe's CMB -- no userspace interface would be required but there
> would need some kernel infrastructure.
Yes, that's what I was thinking. The NVMe/f driver needs to map the CMB
for RDMA. I guess if it used ZONE_DEVICE like in the iopmem patches it
would be relatively easy to do.
Haggai, yes that was one of the use cases we considered when we put
together the patchset.