[Virtio-msg] Re: How to send VIRTIO_MSG_EVENT_USED ?

On 24-02-25, 08:17, Bertrand Marquis wrote:

I tried to put some thoughts into this:

• it is globally possible to poll for virtqueues
• not being able to receive events is kind of a limitation of the FF-A bus implementation in your configuration
• it would not make sense to have a "poll event" message at the transport level as it would enforce the transport to create a thread to call for it based on some information that the bus implementation would have to provide

So how about:

• we handle this at the ffa bus implementation level

Yes, this must be handled at the bus level for now.

• we define a FFA bus message where the driver side can just send a message to poll for event:

request: FFA bus-msg Poll events possible answers:

• no events
• any kind of event request

The drawback against polling the virtqueue is that this is inefficient, as we will need to exchange messages here.

I think we are good for now, as I have found a way to poll the virtqueues from the FFA bus implementation itself (as described in the previous email). So its fine for now I guess.