Re: [Qemu-devel] [PULL 25/26] block: Remove deprecated -drive option serial

[Christian Borntraeger]

On 06/15/2018 04:21 PM, Kevin Wolf wrote:
> The -drive option serial was deprecated in QEMU 2.10. It's time to
> remove it.
> 
> Tests need to be updated to set the serial number with -global instead
> of using the -drive option.

libvirt 4.5 still creates those (at least on s390x)

    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2' cache='none' io='native' iothread='1'/>
      <source file='/var/lib/libvirt/qemu/image.zhyp137'/>
      <target dev='hda' bus='virtio'/>
      <serial>skel</serial>
      <boot order='1'/>
      <address type='ccw' cssid='0xfe' ssid='0x0' devno='0x0000'/>
    </disk>


-> 
[...]
-drive 
file=/var/lib/libvirt/qemu/image.zhyp137,format=qcow2,if=none,id=drive-virtio-disk0,serial=skel,cache=none,aio=native
 -device 
virtio-blk-ccw,iothread=iothread1,scsi=off,devno=fe.0.0000,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1,write-cache=on
 
[...]

2018-06-22T11:25:20.946024Z qemu-system-s390x: -drive 
file=/var/lib/libvirt/qemu/image.zhyp137,format=qcow2,if=none,id=drive-virtio-disk0,serial=skel,cache=none,aio=native:
 Block format 'qcow2' does not support the option 'serial'
2018-06-22 11:25:21.098+0000: shutting down, reason=failed

So it seems that this breaks s390x.