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replay: allow runstate shutdown->running when replaying trace

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When replaying a trace, it is possible to go from shutdown to running
with a reverse-debugging step. This can be useful if the problem being
debugged triggers a reset or shutdown.

This can be tested by making a recording of a machine that shuts down,
then using -action shutdown=pause when replaying it. Continuing to the
end of the trace then reverse-stepping in gdb crashes due to invalid
runstate transition.

Just permitting the transition seems to be all that's necessary for
reverse-debugging to work well in such a state.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Message-Id: <20240813050638.446172-5-npiggin@gmail.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240813202329.1237572-13-alex.bennee@linaro.org>
This commit is contained in:
Nicholas Piggin 2024-08-13 21:23:20 +01:00 • committed by Alex Bennée
parent 4926b6e644
commit 9dbab31d9e
3 changed files with 31 additions and 3 deletions
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1
include/sysemu/runstate.h
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@ -9,6 +9,7 @@ void runstate_set(RunState new_state);
RunState runstate_get(void);
bool runstate_is_running(void);
bool runstate_needs_reset(void);
void runstate_replay_enable(void);
typedef void VMChangeStateHandler(void *opaque, bool running, RunState state);