VHBA_MAXCMDS
vhba->devq = cam_simq_alloc(VHBA_MAXCMDS);
vhba->sim = cam_sim_alloc(vhba_action, vhba_poll, VHBA_MOD, vhba, 0, &vhba->lock, VHBA_MAXCMDS, VHBA_MAXCMDS, vhba->devq);