vmspawn never used `aio=io_uring` for disks, even when QEMU supports it.
Commit 1a7b6fd9dd added a blockdev probe node named `__io_uring_probe`.
QEMU rejects that name ("Invalid node-name"), as node names have to
start with a letter. The probe then reported io_uring as unsupported.
Use a valid name, following the "vmspawn-" prefix of the other node names.
Check the multi-drive test's debug log for rejected node names to catch
this and similar issues in the future.
Signed-off-by: Martin Pitt <martin@amutable.com>
(cherry picked from commit 9c582182e1ae1e38b7ec2dca29bb279cae83e69b)
System and Service Manager
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