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Description of problem:
     It report use migration with shmem device is not supported , when I use the command "virsh migrate --live" to migrate a VM to another host.  
     Migration succeed when I use the same command in ubuntu
           

Version-Release number of selected component (if applicable):
     libvirt 3.9.0
     qemu-kvm  2.8.1

How reproducible:
     

Steps to Reproduce:


1.prepare ivshmem-sever
  get qemu code from  https://download.qemu.org/
  version is 2.8.1  
  ivshmem-sever is in the path qemu-2.8.1\contrib\ivshmem-server.
  compile ivshmem-server.c and main.c 

2. prepare guest with ivshmem-doorbell:
  <shmem name='shmem_server'>
      <model type='ivshmem-doorbell'/>
      <server path='/tmp/ivshmem_socket'/>
      <msi vectors='2' ioeventfd='on'/>
  </shmem> 

3.virsh start vm

4.virsh migrate --live vm qemu+ssh://target/system

Actual results:
     error: Requested operation is not valid: migration with shmem device is not supported

Expected results:
      

Additional info:

if the ivshmem is ivshmem-plain, it also cann't be migrated.
    <shmem name='my_shmem1'>
      <model type='ivshmem-plain'/>
      <size unit='M'>4</size>
    </shmem>

if the ivshmem is ivshmem-plain, it also cann't be migrated.
    <shmem name='my_shmem1'>
      <model type='ivshmem-plain'/>
      <size unit='M'>4</size>
    </shmem>

From the bug description, are you using the upstream qemu? With downstream version (qemu-kvm-rhev) and libvirt version, the shmem migration was disabled. It's not supported.

Closing as a duplicate of a newer bug 1657651, which has a better description.

*** This bug has been marked as a duplicate of bug 1657651 ***