On Tue, 2017-09-26 at 13:54 +1000, David Gibson wrote: > > > > > > Which ones? My impression was that there needed to be at least #cpus > > > * #priority-levels EQs, but there could be more than that, > > > > euh no, not in spapr mode at least. There are 8 queues per cpu. > > Ok.
There's a HW feature of XIVE in DD2.x that I will start exploiting soon that sacrifices a queue btw, keep that in mind. We should probably only expose 0...6 to guests, not 0...7. > > > so it was no longer as tightly bound to the number if "interrupt > > > servers"> as xics. > > > > ah. I think I see what you mean, that we could allocate them on the > > fly when needed by some hcalls ? > > Not at hcall time, no, but at cpu hot(un)plug time I was wondering if we > could (de)allocate them then. > > > The other place where I use the nr_targets is to provision the > > IRQ numbers for the IPIs but that could probably be done in some > > other way, specially it there is a IRQ allocator at the machine > > level. > > Hm, ok. >
