[Libguestfs] Changing a given image from virtio-blk to virtio-scsi

Any idea what 'virt-customize' script I should use to convert from virtio-blk (vda, vdb...) to virtio-scsi (sda, sdb...) ? I've tried naively to convince libvirt to use virtio-scsi and still present it to the guest as 'vd*' - that didn't work ( <disk type='file' device='disk'> <driver name='qemu' type='qcow2'/> <source file='/dev/shm/run/default/images/lago_basic_suite_master_storage_root.qcow2'/> <backingStore type='file' index='1'> <format type='raw'/> <source file='/home/lagostore/phx_repo:el7-base:latest'/> <backingStore/> </backingStore> * <target dev='vda' bus='scsi'/>* <boot order='1'/> <alias name='scsi0-0-0'/> <address type='drive' controller='0' bus='0' target='0' unit='0'/> </disk> TIA, Y.