vmm_gpt_lvl_len
return (node->vgn_gpa + vmm_gpt_lvl_len(node->vgn_level - 1));
const uint64_t per_entry = vmm_gpt_lvl_len(node->vgn_level);
gpa = (gpa & vmm_gpt_lvl_mask(lvl)) + vmm_gpt_lvl_len(lvl);
const uint64_t incr = vmm_gpt_lvl_len(lvl);