On Mon, 18 Jun 2012 15:11:42 +0300 Avi Kivity <avi@xxxxxxxxxx> wrote: > > kvm_for_each_memslot(memslot, slots) { > > - gfn_t gfn = hva_to_gfn(hva, memslot); > > + gfn_t gfn = hva_to_gfn(start_hva, memslot); > > + gfn_t end_gfn = hva_to_gfn(end_hva, memslot); > > These will return random results which you then use in min/max later, no? Yes, I will follow your advice: check-then-convert (or check-and-convert). > > @@ -1212,7 +1218,9 @@ static int kvm_handle_hva(struct kvm *kvm, unsigned long hva, > > rmapp = __gfn_to_rmap(gfn, j, memslot); > > ret |= handler(kvm, rmapp, data); > > Potential for improvement: don't do 512 iterations on same large page. > > Something like > > if ((gfn ^ prev_gfn) & mask(level)) > ret |= handler(...) > > with clever selection of the first prev_gfn so it always matches (~gfn > maybe). Really nice. I'm sure that will make this much faster! Thanks, Takuya -- 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