virtio — archive

[Parav Pandit]

On 4/24/2023 6:06 PM, Max Gurtovoy wrote: >> +If VIRTIO_F_ADMIN_VQ has been negotiated, and if the driver >> +configures any administration virtqueues, the driver MUST >> +configure the administration virtqueues using the index >> +in the range \field{admin_queue_index} to >> +\field{admin_queue_index} + \field{admin_queue_num} - 1 inclusive. >> +The driver MAY configure less administration virtqueues than >> +supported by the device. > > we need to say something about other virtq's indexes. > For example, if aq index = 0 then for the vblk device the request queues > would start from index = 1. > > can we address this ? It may slightly complicate the device implementation when device dynamically changes the VQ indices based on the negotiation of the feature bit. Also the drivers with and without need a different VQ index handling. I am thinking that aq index should not overlap with the vq index in range exposed by num_queues field. This also aligns to the exclusion of aq count from num_queues field.