Backing encrypted drive

Jonas

2/12/24, 3:57 PM

Creating a backing image for the master image that is encrypted using LUKS:

qemu-img create -f qcow2 -b dev.qcow2 -F qcow2 -o encrypt.format=luks,encrypt.key-secret=dev --object secret,id=dev,data='same_as_for_dev.qcow2' dev-inc.qcow2

libvirt configuration:

<disk type="file" device="disk">
  <driver name="qemu" type="qcow2" cache="unsafe"/>
  <source file="/home/user/qemu/dev-inc.qcow2"/>
  <target dev="vda" bus="virtio"/>
  <encryption format="luks" engine="qemu">
    <secret type="passphrase" uuid="0a81f5b2-8403-7b23-c8d6-21ccc2f80d6f"/>
  </encryption>
  <address type="pci" domain="0x0000" bus="0x08" slot="0x00" function="0x0"/>
</disk>

getting this error:

Error starting domain: internal error: Unexpected enum value 0 for virStorageEncryptionEngine

Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 72, in cb_wrapper
    callback(asyncjob, *args, **kwargs)
  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 108, in tmpcb
    callback(*args, **kwargs)
  File "/usr/share/virt-manager/virtManager/object/libvirtobject.py", line 57, in newfn
    ret = fn(self, *args, **kwargs)
  File "/usr/share/virt-manager/virtManager/object/domain.py", line 1384, in startup
    self._backend.create()
  File "/usr/lib/python3/dist-packages/libvirt.py", line 1353, in create
    raise libvirtError('virDomainCreate() failed')
libvirt.libvirtError: internal error: Unexpected enum value 0 for virStorageEncryptionEngine

Is it possible to crate a backing image for the encrypted qcow2, if yes, then what am I missing?

115

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libvirt

qemu

turtle

2/12/24, 9:09 PM

in libvirt config what is cache="unsafe" doing?

Jonas

2/13/24, 7:35 AM

Is it related to my question? I need max possible disk performance.

turtle

2/13/24, 6:18 PM

I just dont see that in the libvirt configuration options, i'd try it without that.

turtle

2/13/24, 6:30 PM

Try it with Cache=none

Jonas

2/14/24, 8:13 AM

Getting the same error

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Backing encrypted drive

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