Specify tracing options.

[enable=]PATTERN
     Immediately enable events matching PATTERN. 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.  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.