Virtualization - Oct 2021 - [RFC PATCH v4 11/20] vhost: Route host->guest notification through shadow virtqueue

? 2021/10/1 ??3:05, Eugenio P?rez ??:
> 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 P?rez<eperezma at redhat.com>