[Qemu-devel] export root node for write through NBD

[Vladimir Sementsov-Ogievskiy]

Hi all.

We need the following option: start vm in stopped mode (-S) and write 
it's disk before start through NBD.
It should be absolutely safe, but unfortunately it is disallowed by root 
role of the disk.
Is there any workaround or if not, what is a true way to implement this 
possibility?

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error message:
    unable to execute QEMU command 'nbd-server-add': Conflicts with use 
by drive0 as 'root', which does not allow 'write' on #block100

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Best regards,
Vladimir