replay: recording and replaying clock ticks

Clock ticks are considered as the sources of non-deterministic data for
virtual machine. This patch implements saving the clock values when they
are acquired (virtual, host clock).
When replaying the execution corresponding values are read from log and
transfered to the module, which wants to read the values.
Such a design required the clock polling to be synchronized. Sometimes
it is not true - e.g. when timeouts for timer lists are checked. In this case
we use a cached value of the clock, passing it to the client code.

Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>
Message-Id: <20150917162427.8676.36558.stgit@PASHA-ISP.def.inno>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>

1 files changed, 2 insertions, 1 deletions

diff --git a/cpus.c b/cpus.c
index f07cac2781..2385caa248 100644
--- a/cpus.c
+++ b/cpus.c
@@ -346,7 +346,8 @@ static void icount_warp_rt(void *opaque)
 
     seqlock_write_lock(&timers_state.vm_clock_seqlock);
     if (runstate_is_running()) {
-        int64_t clock = cpu_get_clock_locked();
+        int64_t clock = REPLAY_CLOCK(REPLAY_CLOCK_VIRTUAL_RT,
+                                     cpu_get_clock_locked());
         int64_t warp_delta;
 
         warp_delta = clock - vm_clock_warp_start;