asce_contains_gfn
if (!asce_contains_gfn(asce, gfn))
if (!asce_contains_gfn(asce, start))
if (!asce_contains_gfn(asce, gpa_to_gfn(saddr)))
if (!asce_contains_gfn(kvm->arch.gmap->asce, new->base_gfn + new->npages - 1))