qtest: add clock management

This patch combines qtest and -icount together to turn the vm_clock
into a source that can be fully managed by the client.  To this end new
commands clock_step and clock_set are added.  Hooking them with libqtest
is left as an exercise to the reader.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/cpus.c b/cpus.c
index ab8d67b9d8..eb22bd5df1 100644
--- a/cpus.c
+++ b/cpus.c
@@ -34,6 +34,7 @@
 
 #include "qemu-thread.h"
 #include "cpus.h"
+#include "qtest.h"
 #include "main-loop.h"
 
 #ifndef _WIN32
@@ -238,6 +239,20 @@ static void icount_warp_rt(void *opaque)
     vm_clock_warp_start = -1;
 }
 
+void qtest_clock_warp(int64_t dest)
+{
+    int64_t clock = qemu_get_clock_ns(vm_clock);
+    assert(qtest_enabled());
+    while (clock < dest) {
+        int64_t deadline = qemu_clock_deadline(vm_clock);
+        int64_t warp = MIN(dest - clock, deadline);
+        qemu_icount_bias += warp;
+        qemu_run_timers(vm_clock);
+        clock = qemu_get_clock_ns(vm_clock);
+    }
+    qemu_notify_event();
+}
+
 void qemu_clock_warp(QEMUClock *clock)
 {
     int64_t deadline;
@@ -264,6 +279,11 @@ void qemu_clock_warp(QEMUClock *clock)
         return;
     }
 
+    if (qtest_enabled()) {
+        /* When testing, qtest commands advance icount.  */
+	return;
+    }
+
     vm_clock_warp_start = qemu_get_clock_ns(rt_clock);
     deadline = qemu_clock_deadline(vm_clock);
     if (deadline > 0) {