在 2021/10/1 下午3:05, Eugenio Pérez 写道:

This will make qemu aware of the device used buffers, allowing it to
write the guest memory with its contents if needed.

Since the use of vhost_virtqueue_start can unmasks and discard call
events, vhost_virtqueue_start should be modified in one of these ways:
* Split in two: One of them uses all logic to start a queue with no
   side effects for the guest, and another one tha actually assumes that
   the guest has just started the device. Vdpa should use just the
   former.
* Actually store and check if the guest notifier is masked, and do it
   conditionally.
* Left as it is, and duplicate all the logic in vhost-vdpa.

Btw, the log looks not clear. I guess this patch goes for method 3. If 
yes, we need explain it and why.

Thanks

Signed-off-by: Eugenio Pérez<eperezma@redhat.com>

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