[Qemu-devel] [RFC PATCH v4 17/25] cpus: make icount warp deterministic in replay mode

[Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>]

This patch adds saving and replaying warping parameters in record and replay
modes. These parameters affect on virtual clock values and therefore should
be deterministic.

Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>
---
 cpus.c |   24 +++++++++++++++++-------
 1 files changed, 17 insertions(+), 7 deletions(-)

diff --git a/cpus.c b/cpus.c
index b41baf6..dac222b 100644
--- a/cpus.c
+++ b/cpus.c
@@ -370,7 +370,9 @@ static void icount_warp_rt(void *opaque)
 
     seqlock_write_lock(&timers_state.vm_clock_seqlock);
     if (runstate_is_running()) {
-        int64_t clock = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
+        int64_t clock = qemu_clock_get_ns(replay_mode == REPLAY_MODE_NONE
+                                          ? QEMU_CLOCK_REALTIME
+                                          : QEMU_CLOCK_HOST);
         int64_t warp_delta;
 
         warp_delta = clock - vm_clock_warp_start;
@@ -444,7 +446,9 @@ void qemu_clock_warp(QEMUClockType type)
     }
 
     /* We want to use the earliest deadline from ALL vm_clocks */
-    clock = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
+    clock = qemu_clock_get_ns(replay_mode == REPLAY_MODE_NONE
+                              ? QEMU_CLOCK_REALTIME
+                              : QEMU_CLOCK_HOST);
     deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL);
     if (deadline < 0) {
         return;
@@ -537,8 +541,10 @@ void configure_icount(QemuOpts *opts, Error **errp)
         return;
     }
     icount_align_option = qemu_opt_get_bool(opts, "align", false);
-    icount_warp_timer = timer_new_ns(QEMU_CLOCK_REALTIME,
-                                          icount_warp_rt, NULL);
+    icount_warp_timer = timer_new_ns(replay_mode == REPLAY_MODE_NONE
+                                     ? QEMU_CLOCK_REALTIME
+                                     : QEMU_CLOCK_HOST,
+                                     icount_warp_rt, NULL);
     if (strcmp(option, "auto") != 0) {
         errno = 0;
         icount_time_shift = strtol(option, &rem_str, 0);
@@ -562,10 +568,14 @@ void configure_icount(QemuOpts *opts, Error **errp)
        the virtual time trigger catches emulated time passing too fast.
        Realtime triggers occur even when idle, so use them less frequently
        than VM triggers.  */
-    icount_rt_timer = timer_new_ms(QEMU_CLOCK_REALTIME,
-                                        icount_adjust_rt, NULL);
+    icount_rt_timer = timer_new_ms(replay_mode == REPLAY_MODE_NONE
+                                   ? QEMU_CLOCK_REALTIME
+                                   : QEMU_CLOCK_HOST,
+                                   icount_adjust_rt, NULL);
     timer_mod(icount_rt_timer,
-                   qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + 1000);
+                   qemu_clock_get_ms(replay_mode == REPLAY_MODE_NONE
+                                     ? QEMU_CLOCK_REALTIME
+                                     : QEMU_CLOCK_HOST) + 1000);
     icount_vm_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
                                         icount_adjust_vm, NULL);
     timer_mod(icount_vm_timer,