On Wed, 2020-05-27 at 09:49 +0100, Stefan Hajnoczi wrote: > > What about feature bits or a API version number field? If you add > features to the NE driver, how will userspace detect them? > > Even if you intend to always compile userspace against the exact kernel > headers that the program will run on, it can still be useful to have an > API version for informational purposes and to easily prevent user > errors (running a new userspace binary on an old kernel where the API is > different). > > Finally, reserved struct fields may come in handy in the future. That > way userspace and the kernel don't need to explicitly handle multiple > struct sizes. Beware, Greg might disagree :) That said, yes, at least a way to query the API version would be useful. Cheers, Ben.
