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