From 8405ec6ab6a05b8c84f7be1130a7891d1a874624 Mon Sep 17 00:00:00 2001 From: Mads Ynddal Date: Tue, 26 Sep 2023 12:34:24 +0200 Subject: [PATCH] simpletrace: annotate magic constants from QEMU code It wasn't clear where the constants and structs came from, so I added comments to help. Reviewed-by: Stefan Hajnoczi Signed-off-by: Mads Ynddal Message-id: 20230926103436.25700-3-mads@ynddal.dk Signed-off-by: Stefan Hajnoczi --- scripts/simpletrace.py | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/scripts/simpletrace.py b/scripts/simpletrace.py index b221d9a241..5c230a1b74 100755 --- a/scripts/simpletrace.py +++ b/scripts/simpletrace.py @@ -16,6 +16,11 @@ __all__ = ['Analyzer', 'process', 'run'] +# This is the binary format that the QEMU "simple" trace backend +# emits. There is no specification documentation because the format is +# not guaranteed to be stable. Trace files must be parsed with the +# same trace-events-all file and the same simpletrace.py file that +# QEMU was built with. header_event_id = 0xffffffffffffffff header_magic = 0xf2b177cb0aa429b4 dropped_event_id = 0xfffffffffffffffe