I don't think this is achievable via EVENT_TUNABLE.
If you need to detect changes made by guest OS in fwcfg then we need
QEMU to send an event to libvirt so that it can be relayed to users.
I have already implemented in a local nutanix branch - I may be throwing a patch set at
them soon.
Once it's merged in QEMU then libvirt can start supporting it too
Okay, thanks, I'll go with the pain-free ordering.
MH.