What were you trying to do that didn't work?

{}{}

Live migrate a guest with NFS storage from source to target after ejecting media from guest on source. The live migration is expected to succeed, but failed:

# virsh migrate --live a qemu+ssh://<target-ip>/system --verbose

error: Cannot access storage file '/var/lib/libvirt/images/cdrom': No such file or directory

# virsh dumpxml a --xpath //disk
...
<disk type="file" device="cdrom">
  <driver name="qemu" type="raw"/>
  <source file="/var/lib/libvirt/images/cdrom" index="1"/>
  <backingStore/>
  <target dev="hdc" bus="scsi" tray="open"/>
  <readonly/>
  <alias name="scsi0-0-0-2"/>
  <address type="drive" controller="0" bus="0" target="0" unit="2"/>
</disk>

Please provide the package NVR for which bug is seen:

For both migration source and target:

1. rpm -qa qemu-kvm
   qemu-kvm-8.2.0-6.el9.x86_64
2. # rpm -qa libvirt
   libvirt-10.0.0-4.el9.x86_64
3. # uname -r
   5.14.0-423.el9.x86_64

Guest

1. uname -r
   5.14.0-425.el9.x86_64

   How reproducible:

100%

Steps to reproduce

1. Create cdrom disk that is not available to migration target

    # qemu-img create -f raw /var/lib/libvirt/images/cdrom 10M   

2. Attach disk to vm

   # virsh attach-disk --domain a --source /var/lib/libvirt/images/cdrom --target sdb --config --driver qemu --subdriver raw --cache none --type cdrom --mode readonly

3. Start vm

   # virsh start a --console

1. Check disk is attached (sr0) (inside guest)

   # lsblk
   
   NAME          MAJ:MIN RM  SIZE RO TYPE MOUNTPOINTS
   ...
   sr0            11:0    1   10M  0 ro

2. Eject the media (inside guest)

   # eject /dev/sr0 
   # echo $?
   0

3. PS. ejection process silently fails, lsblk after eject:
   From `eject` man page: 
   "If eject does not work, it is most likely a limitation of the kernel driver for the device and not the eject program itself."

   # lsblk
   NAME          MAJ:MIN RM  SIZE RO TYPE MOUNTPOINTS
   ...
   sr0            11:0    1   10M  0 rom 

4. Check disk tray is open:

   # virsh dumpxml a --xpath //disk
   ...
   <disk type="file" device="cdrom">
     <driver name="qemu" type="raw"/>
     <source file="/var/lib/libvirt/images/cdrom" index="1"/>
     <backingStore/>
     <target dev="hdc" bus="scsi" tray="open"/>
     <readonly/>
     <alias name="scsi0-0-0-2"/>
     <address type="drive" controller="0" bus="0" target="0" unit="2"/>
   </disk>
   

5. # virsh migrate --live a qemu+ssh://10.73.211.28/system --verbose
   
   error: Cannot access storage file '/var/lib/libvirt/images/cdrom': No such file or directory
   

Expected results

With tray="open" the live migration should succeed. See patch: https://listman.redhat.com/archives/libvir-list/2011-September/msg00465.html

Actual results

Live migration fails