/usr/bin/qemu-system-s390x kvm s390-ccw-virtio-2.7 s390x /usr/share/AAVMF/AAVMF_CODE.fd /usr/share/OVMF/OVMF_CODE.fd rom pflash yes no disk cdrom floppy lun fdc scsi virtio sdl vnc subsystem default mandatory requisite optional usb pci scsi default kvm vfio