[Qemu-devel] [PATCH v11 2/6] trace: [tcg] Delay changes to dynamic state when translating

[Lluís Vilanova]

This keeps consistency across all decisions taken during translation
when the dynamic state of a vCPU is changed in the middle of translating
some guest code.

Signed-off-by: Lluís Vilanova <address@hidden>
Reviewed-by: Richard Henderson <address@hidden>
Reviewed-by: Emilio G. Cota <address@hidden>
---
 include/qom/cpu.h      |    3 +++
 trace/control-target.c |   20 +++++++++++++++++---
 2 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/include/qom/cpu.h b/include/qom/cpu.h
index 31529adf2a..0f507e6f71 100644
--- a/include/qom/cpu.h
+++ b/include/qom/cpu.h
@@ -303,6 +303,8 @@ struct qemu_work_item;
  * @kvm_fd: vCPU file descriptor for KVM.
  * @work_mutex: Lock to prevent multiple access to queued_work_*.
  * @queued_work_first: First asynchronous work pending.
+ * @trace_dstate_delayed: Delayed changes to trace_dstate (includes all changes
+ *                        to @trace_dstate).
  * @trace_dstate: Dynamic tracing state of events for this vCPU (bitmask).
  *
  * State of one CPU core or thread.
@@ -375,6 +377,7 @@ struct CPUState {
     struct kvm_run *kvm_run;
 
     /* Used for events with 'vcpu' and *without* the 'disabled' properties */
+    DECLARE_BITMAP(trace_dstate_delayed, CPU_TRACE_DSTATE_MAX_EVENTS);
     DECLARE_BITMAP(trace_dstate, CPU_TRACE_DSTATE_MAX_EVENTS);
 
     /* TODO Move common fields from CPUArchState here. */
diff --git a/trace/control-target.c b/trace/control-target.c
index 6266e6380d..d30fa5df75 100644
--- a/trace/control-target.c
+++ b/trace/control-target.c
@@ -1,7 +1,7 @@
 /*
  * Interface for configuring and controlling the state of tracing events.
  *
- * Copyright (C) 2014-2016 Lluís Vilanova <address@hidden>
+ * Copyright (C) 2014-2017 Lluís Vilanova <address@hidden>
  *
  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  * See the COPYING file in the top-level directory.
@@ -57,6 +57,13 @@ 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)
 {
@@ -69,13 +76,20 @@ 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);
     }
 }