timer: introduce new QEMU_CLOCK_VIRTUAL_RT clock

This patch introduces new QEMU_CLOCK_VIRTUAL_RT clock, which
should be used for icount warping.  In the next patch, it
will be used to avoid a huge icount warp when a virtual
machine is stopped for a long time.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

2 files changed, 9 insertions, 0 deletions

diff --git a/include/qemu/timer.h b/include/qemu/timer.h
index 3dae414f40..552487c45f 100644
--- a/include/qemu/timer.h
+++ b/include/qemu/timer.h
@@ -36,12 +36,19 @@
  * is suspended, and it will reflect system time changes the host may
  * undergo (e.g. due to NTP). The host clock has the same precision as
  * the virtual clock.
+ *
+ * @QEMU_CLOCK_VIRTUAL_RT: realtime clock used for icount warp
+ *
+ * Outside icount mode, this clock is the same as @QEMU_CLOCK_VIRTUAL.
+ * In icount mode, this clock counts nanoseconds while the virtual
+ * machine is running.
  */
 
 typedef enum {
     QEMU_CLOCK_REALTIME = 0,
     QEMU_CLOCK_VIRTUAL = 1,
     QEMU_CLOCK_HOST = 2,
+    QEMU_CLOCK_VIRTUAL_RT = 3,
     QEMU_CLOCK_MAX
 } QEMUClockType;
 
diff --git a/qemu-timer.c b/qemu-timer.c
index 00a5d35c3f..f4b4b6aa45 100644
--- a/qemu-timer.c
+++ b/qemu-timer.c
@@ -566,6 +566,8 @@ int64_t qemu_clock_get_ns(QEMUClockType type)
             notifier_list_notify(&clock->reset_notifiers, &now);
         }
         return now;
+    case QEMU_CLOCK_VIRTUAL_RT:
+        return cpu_get_clock();
     }
 }