smmuvp0
pool_init(&sc->sc_vp_pool, sizeof(struct smmuvp0), PAGE_SIZE, IPL_VM, 0,
CTASSERT(sizeof(struct smmuvp0) == sizeof(struct smmuvp1));
CTASSERT(sizeof(struct smmuvp0) == sizeof(struct smmuvp2));
CTASSERT(sizeof(struct smmuvp0) != sizeof(struct smmuvp3));
struct smmuvp0 *l0; /* virtual to physical table 4 lvl */