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-rw-r--r--trace/control-target.c18
1 files changed, 16 insertions, 2 deletions
diff --git a/trace/control-target.c b/trace/control-target.c
index 99a8ed5157..31c2ed11a0 100644
--- a/trace/control-target.c
+++ b/trace/control-target.c
@@ -61,6 +61,13 @@ void trace_event_set_state_dynamic(TraceEvent *ev, bool state)
}
}
+static void trace_event_synchronize_vcpu_state_dynamic(
+ CPUState *vcpu, run_on_cpu_data ignored)
+{
+ bitmap_copy(vcpu->trace_dstate, vcpu->trace_dstate_delayed,
+ CPU_TRACE_DSTATE_MAX_EVENTS);
+}
+
void trace_event_set_vcpu_state_dynamic(CPUState *vcpu,
TraceEvent *ev, bool state)
{
@@ -73,13 +80,20 @@ void trace_event_set_vcpu_state_dynamic(CPUState *vcpu,
if (state_pre != state) {
if (state) {
trace_events_enabled_count++;
- set_bit(vcpu_id, vcpu->trace_dstate);
+ set_bit(vcpu_id, vcpu->trace_dstate_delayed);
(*ev->dstate)++;
} else {
trace_events_enabled_count--;
- clear_bit(vcpu_id, vcpu->trace_dstate);
+ clear_bit(vcpu_id, vcpu->trace_dstate_delayed);
(*ev->dstate)--;
}
+ /*
+ * Delay changes until next TB; we want all TBs to be built from a
+ * single set of dstate values to ensure consistency of generated
+ * tracing code.
+ */
+ async_run_on_cpu(vcpu, trace_event_synchronize_vcpu_state_dynamic,
+ RUN_ON_CPU_NULL);
}
}