perf script: Add guest_code support

Add an option to indicate that guest code can be found in the hypervisor
process.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: kvm@vger.kernel.org
Link: https://lore.kernel.org/r/20220517131011.6117-5-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

Author: ahunter6

tools/perf/Documentation/perf-script.txt

@@ -499,6 +499,10 @@ include::itrace.txt[]
 	The known limitations include exception handing such as
 	setjmp/longjmp will have calls/returns not match.
 
+--guest-code::
+	Indicate that guest code can be found in the hypervisor process,
+	which is a common case for KVM test programs.
+
 SEE ALSO
 --------
 linkperf:perf-record[1], linkperf:perf-script-perl[1],

tools/perf/builtin-script.c

@@ -3912,6 +3912,8 @@ int cmd_script(int argc, const char **argv)
 		   "file", "file saving guest os /proc/kallsyms"),
 	OPT_STRING(0, "guestmodules", &symbol_conf.default_guest_modules,
 		   "file", "file saving guest os /proc/modules"),
+	OPT_BOOLEAN(0, "guest-code", &symbol_conf.guest_code,
+		    "Guest code can be found in hypervisor process"),
 	OPT_BOOLEAN('\0', "stitch-lbr", &script.stitch_lbr,
 		    "Enable LBR callgraph stitching approach"),
 	OPTS_EVSWITCH(&script.evswitch),
@@ -3937,7 +3939,8 @@ int cmd_script(int argc, const char **argv)
 	if (symbol_conf.guestmount ||
 	    symbol_conf.default_guest_vmlinux_name ||
 	    symbol_conf.default_guest_kallsyms ||
-	    symbol_conf.default_guest_modules) {
+	    symbol_conf.default_guest_modules ||
+	    symbol_conf.guest_code) {
 		/*
 		 * Enable guest sample processing.
 		 */