Mark McLoughlin wrote:
Set the VIRTIO_F_NOTIFY_ON_EMPTY feature bit so the
guest can rely on us notifying them when the queue
is empty.
Also, only notify when the available queue is empty
*and* when we've finished with all the buffers we
had detached. Right now, when the queue is empty,
we notify the guest for every used buffer.
This is a bit inflexible. I would prefer a mechanism where the guest
tells us at what queue index it would like the notification, like Xen.
If it wants it on queue empty, it just sets the index appropriately.
Or is the usage in the drivers already upstream and I have no choice
about applying this?
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
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