replay: checkpoints
This patch introduces checkpoints that synchronize cpu thread and iothread.
When checkpoint is met in the code all asynchronous events from the queue
are executed.
Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>
Message-Id: <20150917162444.8676.52916.stgit@PASHA-ISP.def.inno>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
diff --git a/vl.c b/vl.c
index f481a1e..8806092 100644
--- a/vl.c
+++ b/vl.c
@@ -1642,15 +1642,21 @@
static int qemu_reset_requested(void)
{
int r = reset_requested;
- reset_requested = 0;
- return r;
+ if (r && replay_checkpoint(CHECKPOINT_RESET_REQUESTED)) {
+ reset_requested = 0;
+ return r;
+ }
+ return false;
}
static int qemu_suspend_requested(void)
{
int r = suspend_requested;
- suspend_requested = 0;
- return r;
+ if (r && replay_checkpoint(CHECKPOINT_SUSPEND_REQUESTED)) {
+ suspend_requested = 0;
+ return r;
+ }
+ return false;
}
static WakeupReason qemu_wakeup_requested(void)
@@ -1798,7 +1804,12 @@
shutdown_signal = signal;
shutdown_pid = pid;
no_shutdown = 0;
- qemu_system_shutdown_request();
+
+ /* Cannot call qemu_system_shutdown_request directly because
+ * we are in a signal handler.
+ */
+ shutdown_requested = 1;
+ qemu_notify_event();
}
void qemu_system_shutdown_request(void)
@@ -4483,6 +4494,10 @@
}
qemu_add_globals();
+ /* This checkpoint is required by replay to separate prior clock
+ reading from the other reads, because timer polling functions query
+ clock values from the log. */
+ replay_checkpoint(CHECKPOINT_INIT);
qdev_machine_init();
current_machine->ram_size = ram_size;
@@ -4601,6 +4616,10 @@
exit(1);
}
+ /* This checkpoint is required by replay to separate prior clock
+ reading from the other reads, because timer polling functions query
+ clock values from the log. */
+ replay_checkpoint(CHECKPOINT_RESET);
qemu_system_reset(VMRESET_SILENT);
register_global_state();
if (loadvm) {
