On Fri, 2016-07-22 at 22:37 +1000, Nicholas Piggin wrote: > > We also handle fault with proper stack initialized. This enable us > to > > callout to C in fault handling routines. We don't do this for > kernel > > mapping, because of the possibility of taking recursive fault if > > kernel stack in not yet mapped by an slb entry. > > > > This enable us to handle Power9 slb fault better. We will add > bolted > > entries for the entire kernel mapping in segment table and user slb > > entries we take fault and insert on demand. With translation on, we > > should be able to access segment table from fault handler. > > What does this cost on P8? Is that a problem? Might need to do > feature bits.
Also what is the need ? The segment table is only for Nest MMU clients, we should probably handle it separately. Cheers, Ben. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
