On Wed, Dec 21, 2016 at 09:29:39AM +0300, Roman Kagan wrote: > QEMU in particular. We're planning to implement VMBus devices in QEMU > and would like to have the definitions shared with the Linux guest > drivers for Hyper-V.
And that's everything but a userspace API. The way to go for protocol constants is to have a normal kernel header that is not exported, and a copy of it wherever else you need it.
