Specify tracing options.

[enable=]PATTERN
     Immediately enable events matching PATTERN (either event name or a globbing pattern).  This option is only available if QEMU has been compiled with the SIMPLE, LOG or FTRACE tracing backend.  To specify multiple events or patterns, specify the -trace option multiple times.

     Use -trace help to print a list of names of trace points.

events=FILE
     Immediately enable events listed in FILE. The file must contain one event name (as listed in the trace-events-all file) per line; globbing patterns are accepted too.  This option is only available if QEMU has been compiled with the SIMPLE, LOG or FTRACE tracing backend.

file=FILE
     Log output traces to FILE. This option is only available if QEMU has been compiled with the SIMPLE tracing backend.