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authorPavel Dovgalyuk <pavel.dovgaluk@ispras.ru>2017-01-24 10:17:30 +0300
committerPaolo Bonzini <pbonzini@redhat.com>2017-01-27 18:07:30 +0100
commit1dfb1b2d34840dce27e672f147bc4ef122abab74 (patch)
treed974610c51b434cc23928a109186226223fc0974
parentd718b14b8cc2a28dcf48b68c87f16a36d280c36e (diff)
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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: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru> Message-Id: <20170124071730.4572.41874.stgit@PASHA-ISP> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
-rw-r--r--hw/timer/mc146818rtc.c15
1 files changed, 11 insertions, 4 deletions
diff --git a/hw/timer/mc146818rtc.c b/hw/timer/mc146818rtc.c
index 637f872..4165450 100644
--- a/hw/timer/mc146818rtc.c
+++ b/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