> > If following the direction having controlling function to explicitly provide > services then all those doorbells should be deprecated and instead we want > explicit communications between VF driver and PF driver. Hardware mechanism of communication (door bell here) can be used to support broader scenario when VF driver and PF driver run in 2 different OS kernels (when the VF is assigned to a VM). > > From userspace driver p.o.v. the VFIO uAPI is kind of a device programming > interface. Here we just present everything related to the controlled device > itself (including the state management) via a centralized portal though in the > kernel there might be linkage out of VFIO to reach the controlling driver. kind > of a sw doorbell. 😊 Yes. And sw doorbell is more efficient than hardware doorbell 😊 .
