On Thu, 2018-11-29 at 11:47 +1100, David Gibson wrote: > > 1) read/write accessors which take a word number > > 2) A "get" accessor which copies the whole structure, but "write" > accessor which takes a word number. The asymmetry is a bit ugly, but > it's the non-atomic writeback of the whole structure which I'm most > uncomfortable with.
It shouldn't be a big deal though, there are HW facilities to access the structures "atomically" anyway, due to the caching done by the XIVE. > 3) A map/unmap interface which gives you / releases a pointer to the > "live" structure. For powernv that would become > address_space_map()/unmap(). For PAPR it would just be reutn pointer > / no-op.
