There is an error_report() in target/i386/kvm/vmsr_energy.c that would benefit for being a tracepoint because this is not actually an "error" as per se, but more a notification that could be used for debugging, and it is quite verbose.

What needs to be done:

• Modify the file target/i386/kvm/trace-events to define your desired tracepoint(s).
• Add #include "trace-event.h"  in vmsr_energy.c  file
• Call your probepoint using  trace_{probe name}(...args...)

(See docs/devel/tracing.rst for general info on tracing)