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replay: synchronize on every virtual timer callback

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Sometimes virtual timer callbacks depend on order
of virtual timer processing and warping of virtual clock.
Therefore every callback should be logged to make replay deterministic.
This patch creates a checkpoint before every virtual timer callback.
With these checkpoints virtual timers processing and clock warping
events order is completely deterministic.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
Acked-by: Alex Bennée <alex.bennee@linaro.org>

--

v2:
  - remove mutex lock/unlock for virtual clock checkpoint since it is
    not process any asynchronous events (commit ca9759c2a9)
  - bump record/replay log file version
Message-Id: <159012932716.27256.8854065545365559921.stgit@pasha-ThinkPad-X280>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Pavel Dovgalyuk 2020-05-22 09:35:27 +03:00 • committed by Paolo Bonzini
parent 255ae6e215
commit 677a3baba4
2 changed files with 10 additions and 24 deletions
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2
replay/replay.c
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@ -22,7 +22,7 @@
/* Current version of the replay mechanism.
Increase it when file format changes. */
#define REPLAY_VERSION 0xe02009
#define REPLAY_VERSION 0xe0200a
/* Size of replay log header */
#define HEADER_SIZE (sizeof(uint32_t) + sizeof(uint64_t))