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Merge remote-tracking branch 'remotes/stefanha/tags/tracing-pull-request' into staging

# gpg: Signature made Wed 07 Jun 2017 19:55:32 BST
# gpg:                using RSA key 0x9CA4ABB381AB73C8
# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>"
# gpg:                 aka "Stefan Hajnoczi <stefanha@gmail.com>"
# Primary key fingerprint: 8695 A8BF D3F9 7CDA AC35  775A 9CA4 ABB3 81AB 73C8

* remotes/stefanha/tags/tracing-pull-request:
  simpletrace: Improve the error message if event is not declared

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

scripts/simpletrace.py

@@ -42,7 +42,15 @@ def get_record(edict, idtoname, rechdr, fobj):
         event_id = rechdr[0]
         name = idtoname[event_id]
         rec = (name, rechdr[1], rechdr[3])
-        event = edict[name]
+        try:
+            event = edict[name]
+        except KeyError, e:
+            import sys
+            sys.stderr.write('%s event is logged but is not declared ' \
+                             'in the trace events file, try using ' \
+                             'trace-events-all instead.\n' % str(e))
+            sys.exit(1)
+
         for type, name in event.args:
             if is_string(type):
                 l = fobj.read(4)