Christian Brauner
d73628e85d
Test the async QMP drive pipeline with real QEMU: Test 1 (multi-drive): launches vmspawn with --image plus two --extra-drive flags. This exercises multiple fdset allocations, pipelined blockdev-add commands relying on FIFO ordering, io_uring retry callbacks, and multiple device_add commands — all fired without waiting for responses. Test 2 (ephemeral): launches vmspawn with --image --ephemeral. This exercises the most complex async path: blockdev-create fires a background job, JOB_STATUS_CHANGE events are watched via the event callback, and when the job concludes the deferred continuation fires the overlay format node + device_add. If the continuation fails, the root drive is never attached, the kernel panics, and vmspawn exits without registering — so successful registration proves the pipeline works. Both tests use a raw ext4 image with a minimal init (sleep infinity) and direct kernel boot. No virtiofsd needed. Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
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