replay: don't use rtc clock on loadvm phase

This patch disables the update of the periodic timer of mc146818rtc
in record/replay mode. State of this timer is saved and therefore does
not need to be updated in record/replay mode.
Read of RTC breaks the replay because all rtc reads have to be the same
as in record mode.
Signed-off-by: NPavel Dovgalyuk <pavel.dovgaluk@ispras.ru>
Message-Id: <20170124071730.4572.41874.stgit@PASHA-ISP>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

hw/timer/mc146818rtc.c

@@ -27,6 +27,7 @@
 #include "hw/hw.h"
 #include "qemu/timer.h"
 #include "sysemu/sysemu.h"
+#include "sysemu/replay.h"
 #include "hw/timer/mc146818rtc.h"
 #include "qapi/visitor.h"
 #include "qapi-event.h"
@@ -734,10 +735,16 @@ static int rtc_post_load(void *opaque, int version_id)
         check_update_timer(s);
     }
 
-    uint64_t now = qemu_clock_get_ns(rtc_clock);
-    if (now < s->next_periodic_time ||
-        now > (s->next_periodic_time + get_max_clock_jump())) {
-        periodic_timer_update(s, qemu_clock_get_ns(rtc_clock));
+    /* The periodic timer is deterministic in record/replay mode,
+     * so there is no need to update it after loading the vmstate.
+     * Reading RTC here would misalign record and replay.
+     */
+    if (replay_mode == REPLAY_MODE_NONE) {
+        uint64_t now = qemu_clock_get_ns(rtc_clock);
+        if (now < s->next_periodic_time ||
+            now > (s->next_periodic_time + get_max_clock_jump())) {
+            periodic_timer_update(s, qemu_clock_get_ns(rtc_clock));
+        }
     }
 
 #ifdef TARGET_I386