[Qemu-devel] [PATCH v2 3/3] icount: print a warning if there is no more deadline in sleep=no mode

[Victor CLEMENT <victor.clement@openwide.fr>]

While qemu is running in sleep=no mode, a warning will be printed
when no timer deadline is set.
As this mode is intended for getting deterministic virtual time, if no
timer is set on the virtual clock this determinism is broken.

Signed-off-by: Victor CLEMENT <victor.clement@openwide.fr>
---
 cpus.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/cpus.c b/cpus.c
index 4e90e63..aec17b6 100644
--- a/cpus.c
+++ b/cpus.c
@@ -419,6 +419,12 @@ void qemu_clock_warp(QEMUClockType type)
     clock = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL_RT);
     deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL);
     if (deadline < 0) {
+        static bool notified;
+        if (!icount_sleep && !notified) {
+            fprintf(stderr, "cpus: WARNING: icount sleep disabled and no more \
+active timer\n");
+            notified = true;
+        }
         return;
     }
 
-- 
2.4.2