From: https://lists.oasis-open.org/archives/virtio-comment/201404/msg00001.html

There is no bit to indicate the status of device. When device detects errors
such as: host resource error, device implementation error, invalid input from
user, invalid command or request from driver, and the error is not recoverable
for the device, we should be able to communicate this. Suggest add:

DEVICE_NEEDS_RESET (16)
Indicate that the device is in an unrecoverable failed state, and need reset.