tree d16924296b98d3967f31f773c264ad48eef7faf3
parent 507613bf31f4bc0a344a1dfc1bc9074fed6eab8f
author Michael S. Tsirkin <mst@redhat.com> 1413330750 +1030
committer Rusty Russell <rusty@rustcorp.com.au> 1413330901 +1030

virtio: add API to enable VQs early

virtio spec 0.9.X requires DRIVER_OK to be set before
VQs are used, but some drivers use VQs before probe
function returns.
Since DRIVER_OK is set after probe, this violates the spec.

Even though under virtio 1.0 transitional devices support this
behaviour, we want to make it possible for those early callers to become
spec compliant and eventually support non-transitional devices.

Add API for drivers to call before using VQs.

Sets DRIVER_OK internally.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>