[Qemu-devel] Could not transaction encrypted image

[18781374080]

hi ，everyone!
I am a newcomer to QEMU, and I don't know if it's a native question
I create snapshots of virtual machines that use encrypted disk, The console 
gave me the following error:
2019-09-06 10:13:41,902+0800 ERROR (jsonrpc/0) [virt.vm] 
(vmId='ebdb8b82-b8c0-46b1-bb2a-678873d46d2f') Unable to take snapshot (vm:4616)


Traceback(most recent call last):
    File "/usr/lib/python2.7/site-packages/vdsm/virt/vm.py",line 4613, in 
snapshot
          self._dom,snapshotCreateXML(snapxml, snapFlags)
    File "/usr/lib/python2.7/site-packages/vdsm/virt/virdomain.py", in line 98, 
in f 
           ret = attr(*args, **kwargs)
    File "/usr/lib/python2.7/site-packages/vdsm/common/libvirtconnection.py", 
line 130, in wrapper
    ret = f(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/vdsm/common/function.py", line 92, in 
wrapper
    return func(inst, *args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/libvirt.py", line 2620, in 
snapshotCreateXML
    if ret is None:raise libvirtError('virDomainSnapshotCreateXML() failed', 
dom=self)
 libvirtError: internal error: unable to execute QEMU command 'transaction': 
Parameter 'encrypt.key-secret' is required for cipher





I know I need to add encrypt in 'transacton' command. The key - secret 
information, through the search after I found the QEMU command is through QMP, 
but I don't know how to compile and add the required information。

Any help or reminder is appreciated! thank you!

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