It seems that virtio_scsi might also be required for cdrom: # lsmod Module Size Used by rng_core 20480 0 aes_s390 24576 0 des_s390 20480 0 des_generic 28672 1 des_s390 sha_common 16384 0 virtio_balloon 20480 0 sr_mod 28672 0 cdrom 57344 1 sr_mod virtio_scsi 24576 0 scsi_mod 225280 2 virtio_scsi,sr_mod virtio_blk 24576 0 virtio_net 49152 0 net_failover 20480 1 virtio_net failover 16384 1 net_failover
-- Valentin
