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Subject: Re: [virtio] [PATCH v2] initialization: add extra device status handshake

Il 25/09/2013 10:28, Michael S. Tsirkin ha scritto:
> > Failure to start vhost (which is fatal for vhost-scsi,
> > since there is no userspace fallback unlike vhost-net) could be reported
> > by not acknowledging FEATURES_OK.
> I think what you are asking for really, is
> DEVICE_OK flag that locks both features and rings
> and enables device.

Yes, you're right.  Plus the fact that the device might not acknowledge
DEVICE_OK, which renders the device unusable.

There is a difference, though.  What happens if a virtqueue is only
enabled by a particular feature?  FEATURES_OK would let the device
disable discovery of that virtqueue.  DEVICE_OK wouldn't.


> It would have to be set from driver quite late in life.

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