Author :
sf
Date :
2019-05-26 15:20:04
Hash :0091658a Message :Rework virtio_negotiate_features()
Add a sc_driver_features field that is automatically used by
virtio_negotiate_features() and during reinit.
Make virtio_negotiate_features() return an error code. Virtio 1.0 has a
special status bit for feature negotiation that means that negotiation
can fail. Make virtio_negotiate_features() return an error code instead
of the features.
Make virtio_reinit_start() automatically call
virtio_negotiate_features().
Add a convenience function virtio_has_feature() to make checking bits
easier.
Add an error check in viomb for virtio_negotiate_features because it has
some feature bits that may cause negotiation to fail. More error
checking in the child drivers is still missing.
ok mlarkin@
sf