_kvm_pa2off
s = _kvm_pa2off(kd, va, pa);
s = _kvm_pa2off(kd, pdpe_pa, &ofs);
s = _kvm_pa2off(kd, pde_pa, &ofs);
s = _kvm_pa2off(kd, a, pa);
s = _kvm_pa2off(kd, pte_pa, &ofs);
s = _kvm_pa2off(kd, a, pa);