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replay: ptimer

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This patch adds deterministic replay for hardware periodic countdown timers.
ptimer uses bottom halves layer to execute such an asynchronous callback.
We put this callback into the replay queue instead of bottom halves one.
When checkpoint is met by main loop thread, the replay queue is processed
and callback is executed. Binding callback moment to one of the checkpoints
makes it deterministic.

Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>
Message-Id: <20150917162456.8676.83366.stgit@PASHA-ISP.def.inno>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
This commit is contained in:
Pavel Dovgalyuk 2015-09-17 19:24:56 +03:00 • committed by Paolo Bonzini
parent df281b80b9
commit 8a354bd935
4 changed files with 28 additions and 4 deletions
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3
include/sysemu/replay.h
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@ -15,6 +15,7 @@
#include <stdbool.h>
#include <stdint.h>
#include "qapi-types.h"
#include "qemu/typedefs.h"
/* replay clock kinds */
enum ReplayClockKind {
@ -97,5 +98,7 @@ bool replay_checkpoint(ReplayCheckpoint checkpoint);
void replay_disable_events(void);
/*! Returns true when saving events is enabled */
bool replay_events_enabled(void);
/*! Adds bottom half event to the queue */
void replay_bh_schedule_event(QEMUBH *bh);
#endif