On 11/25/2013 06:19 PM, Gleb Natapov wrote: > On Mon, Nov 25, 2013 at 02:11:31PM +0800, Xiao Guangrong wrote: >>> >>> For example, nothing prevents lockless walker to move into some >>> parent_ptes chain, right? >> >> No. >> >> The nulls can help us to detect this case, for parent_ptes, the nulls points >> to "shadow page" but for rmaps, the nulls points to slot.arch.rmap. There >> is no chance that the �rmap" is used as shadow page when slot-lock is held. >> > But meanwhile we will write protect non-last level sptes, no? Better to It will meet the non-last sptes but does not write-protect them since we have do is_last_spte() check before cmpxchg. > create separate slab caches for rmap and parent_ptes lists. Yes, this is a good idea. Thanks you, Gleb! -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
