Currently, diff, top, buildid-list and stat use strncmp to match subcommands.
As a result, matching does not meet expectation.

For example:
  # perf kvm diff1234
  # Event 'cycles'
  #
  # Baseline  Delta Abs  Shared Object  Symbol
  # ........  .........  .............  ......
  #

  # Event 'dummy:HG'
  #
  # Baseline  Delta Abs  Shared Object  Symbol
  # ........  .........  .............  ......
  #
  # echo $?
  0
  #

Invalid information should be returned, but success is actually returned.

Solution: Use strstarts to match subcommands.

After:
  # perf kvm diff1234

   Usage: perf kvm [<options>] {top|record|report|diff|buildid-list|stat}

      -i, --input <file>    Input file name
      -o, --output <file>   Output file name
      -v, --verbose         be more verbose (show counter open errors, etc)
          --guest           Collect guest os data
          --guest-code      Guest code can be found in hypervisor process
          --guestkallsyms <file>
                            file saving guest os /proc/kallsyms
          --guestmodules <file>
                            file saving guest os /proc/modules
          --guestmount <directory>
                            guest mount directory under which every guest os instance has a subdir
          --guestvmlinux <file>
                            file saving guest os vmlinux
          --host            Collect host os data

  # echo $?
  129
  #

Signed-off-by: Yang Jihong <yangjihong1@huawei.com>
---
 tools/perf/builtin-kvm.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
index 3696ae97f149..7d9ec1bac1a2 100644
--- a/tools/perf/builtin-kvm.c
+++ b/tools/perf/builtin-kvm.c
@@ -1638,14 +1638,14 @@ int cmd_kvm(int argc, const char **argv)
 		return __cmd_record(file_name, argc, argv);
 	else if (strlen(argv[0]) > 2 && strstarts("report", argv[0]))
 		return __cmd_report(file_name, argc, argv);
-	else if (!strncmp(argv[0], "diff", 4))
+	else if (strlen(argv[0]) > 2 && strstarts("diff", argv[0]))
 		return cmd_diff(argc, argv);
-	else if (!strncmp(argv[0], "top", 3))
+	else if (!strcmp(argv[0], "top"))
 		return cmd_top(argc, argv);
-	else if (!strncmp(argv[0], "buildid-list", 12))
+	else if (strlen(argv[0]) > 2 && strstarts("buildid-list", argv[0]))
 		return __cmd_buildid_list(file_name, argc, argv);
 #ifdef HAVE_KVM_STAT_SUPPORT
-	else if (!strncmp(argv[0], "stat", 4))
+	else if (strlen(argv[0]) > 2 && strstarts("stat", argv[0]))
 		return kvm_cmd_stat(file_name, argc, argv);
 #endif
 	else
-- 
2.30.GIT