[Qemu-devel] [PULL 11/18] icount: improve counting for record/replay

[Paolo Bonzini <pbonzini@redhat.com>]

From: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>

icount_warp_rt function is called by qemu_clock_warp and as
callback of icount_warp timer. This patch adds call to qemu_clock_warp
into main_loop_wait function, because icount warp may be missed
in record/replay mode, when CPU is sleeping.
This patch also disables of calling this function by timer, because
it is not needed after making modifications of main_loop_wait.

Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>
Message-Id: <20150917162439.8676.38290.stgit@PASHA-ISP.def.inno>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
---
 cpus.c      | 11 ++++++++---
 main-loop.c |  3 +++
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/cpus.c b/cpus.c
index 2385caa..1a7318f 100644
--- a/cpus.c
+++ b/cpus.c
@@ -335,7 +335,7 @@ static int64_t qemu_icount_round(int64_t count)
     return (count + (1 << icount_time_shift) - 1) >> icount_time_shift;
 }
 
-static void icount_warp_rt(void *opaque)
+static void icount_warp_rt(void)
 {
     /* The icount_warp_timer is rescheduled soon after vm_clock_warp_start
      * changes from -1 to another value, so the race here is okay.
@@ -370,6 +370,11 @@ static void icount_warp_rt(void *opaque)
     }
 }
 
+static void icount_dummy_timer(void *opaque)
+{
+    (void)opaque;
+}
+
 void qtest_clock_warp(int64_t dest)
 {
     int64_t clock = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
@@ -414,7 +419,7 @@ void qemu_clock_warp(QEMUClockType type)
          * the CPU starts running, in case the CPU is woken by an event other
          * than the earliest QEMU_CLOCK_VIRTUAL timer.
          */
-        icount_warp_rt(NULL);
+        icount_warp_rt();
         timer_del(icount_warp_timer);
     }
     if (!all_cpu_threads_idle()) {
@@ -607,7 +612,7 @@ void configure_icount(QemuOpts *opts, Error **errp)
     icount_sleep = qemu_opt_get_bool(opts, "sleep", true);
     if (icount_sleep) {
         icount_warp_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL_RT,
-                                         icount_warp_rt, NULL);
+                                         icount_dummy_timer, NULL);
     }
 
     icount_align_option = qemu_opt_get_bool(opts, "align", false);
diff --git a/main-loop.c b/main-loop.c
index db600a3..df28670 100644
--- a/main-loop.c
+++ b/main-loop.c
@@ -506,6 +506,9 @@ int main_loop_wait(int nonblocking)
     slirp_pollfds_poll(gpollfds, (ret < 0));
 #endif
 
+    /* CPU thread can infinitely wait for event after
+       missing the warp */
+    qemu_clock_warp(QEMU_CLOCK_VIRTUAL);
     qemu_clock_run_all_timers();
 
     return ret;
-- 
1.8.3.1