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replay: don't process async events when warping the clock 

Virtual clock is warped from iothread and vcpu thread. When the hardware
events associated with warp checkpoint, then interrupt delivering may be
non-deterministic if checkpoint is processed in different threads in record
and replay.
This patch disables event processing for clock warp checkpoint and leaves
all hardware events to other checkpoints (e.g., virtual clock).

Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>
Message-Id: <20180227095316.1060.4134.stgit@pasha-VirtualBox>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
This commit is contained in:
Pavel Dovgalyuk 2018-02-27 12:53:16 +03:00 committed by Paolo Bonzini
parent 821c113033
commit 89e46eb477
2 changed files with 7 additions and 1 deletions
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1
replay/replay-events.c
View File

@ -205,6 +205,7 @@ static void replay_save_event(Event *event, int checkpoint)
void replay_save_events(int checkpoint)
{
g_assert(replay_mutex_locked());
g_assert(checkpoint != CHECKPOINT_CLOCK_WARP_START);
while (!QTAILQ_EMPTY(&events_list)) {
Event *event = QTAILQ_FIRST(&events_list);
replay_save_event(event, checkpoint);

7
replay/replay.c
View File

@ -211,7 +211,12 @@ bool replay_checkpoint(ReplayCheckpoint checkpoint)
} else if (replay_mode == REPLAY_MODE_RECORD) {
g_assert(replay_mutex_locked());
replay_put_event(EVENT_CHECKPOINT + checkpoint);
replay_save_events(checkpoint);
/* This checkpoint belongs to several threads.
Processing events from different threads is
non-deterministic */
if (checkpoint != CHECKPOINT_CLOCK_WARP_START) {
replay_save_events(checkpoint);
}
res = true;
}
out: