Sukadev Bhattiprolu [off-list ref] writes:

Define an interface that the NX drivers can use to find the physical
paste address of a send window. This interface is expected to be used
with the mmap() operation of the NX driver's device. i.e the user space
process can use driver's mmap() operation to map the send window's paste
address into their address space and then use copy and paste instructions
to submit the CRBs to the NX engine.

Note that kernel drivers will use vas_paste_crb() directly and don't need
this interface.

AFAICS this is not used. And if it was that would be a problem because
there are implications in letting userspace do paste, so can you drop
this from the series for now.

cheers