NVL_MPXEN
rv = nvlist_lookup_boolean_value(devnvl, NVL_MPXEN, &mpxenp);
NVL_MPXEN, B_TRUE);
NVL_MPXEN, devfspath,
rv = nvlist_add_boolean_value(devnvl, NVL_MPXEN, B_FALSE);
NVL_MPXEN, devfspath,
NVL_MPXEN, &devmpx);
(void) nvlist_lookup_boolean_value(thisdevnvl, NVL_MPXEN,
(void) nvlist_lookup_boolean_value(thisdev, NVL_MPXEN, &mpxenp);