[v4,13/20] instrument: Add event 'guest_cpu_exit'

diff --git a/instrument/control.c b/instrument/control.c
index ed0d537b88..09ba682483 100644
--- a/instrument/control.c
+++ b/instrument/control.c
@@ -57,3 +57,12 @@  QI_VPUBLIC void qi_event_set_guest_cpu_enter(void (*fn)(QICPU vcpu))
     ERROR_IF(!instr_get_state(), "called outside instrumentation");
     instr_set_event(guest_cpu_enter, fn);
 }
+
+
+void (*instr_event__guest_cpu_exit)(QICPU vcpu);
+
+QI_VPUBLIC void qi_event_set_guest_cpu_exit(void (*fn)(QICPU vcpu))
+{
+    ERROR_IF(!instr_get_state(), "called outside instrumentation");
+    instr_set_event(guest_cpu_exit, fn);
+}
diff --git a/instrument/events.h b/instrument/events.h
index 947f120aa9..c743cb8180 100644
--- a/instrument/events.h
+++ b/instrument/events.h
@@ -36,6 +36,9 @@  extern void *instr_event__fini_data;
 extern void (*instr_event__guest_cpu_enter)(QICPU vcpu);
 static inline void instr_guest_cpu_enter(CPUState *vcpu);
 
+extern void (*instr_event__guest_cpu_exit)(QICPU vcpu);
+static inline void instr_guest_cpu_exit(CPUState *vcpu);
+
 
 #include "instrument/events.inc.h"
 
diff --git a/instrument/events.inc.h b/instrument/events.inc.h
index 238cce9855..bcbf0cb32a 100644
--- a/instrument/events.inc.h
+++ b/instrument/events.inc.h
@@ -20,3 +20,14 @@  static inline void instr_guest_cpu_enter(CPUState *vcpu)
         instr_set_state(INSTR_STATE_DISABLE);
     }
 }
+
+static inline void instr_guest_cpu_exit(CPUState *vcpu)
+{
+    void (*cb)(QICPU vcpu) = instr_get_event(guest_cpu_exit);
+    if (cb) {
+        QICPU vcpu_ = instr_cpu_set(vcpu);
+        instr_set_state(INSTR_STATE_ENABLE);
+        (*cb)(vcpu_);
+        instr_set_state(INSTR_STATE_DISABLE);
+    }
+}
diff --git a/instrument/load.c b/instrument/load.c
index 0fe878afa8..63b7d564ec 100644
--- a/instrument/load.c
+++ b/instrument/load.c
@@ -149,6 +149,7 @@  InstrUnloadError instr_unload(int64_t handle_id)
 
     instr_set_event(fini_fn, NULL);
     instr_set_event(guest_cpu_enter, NULL);
+    instr_set_event(guest_cpu_exit, NULL);
 
     /* this should never fail */
     if (dlclose(handle->dlhandle) < 0) {
diff --git a/instrument/qemu-instr/control.h b/instrument/qemu-instr/control.h
index 26d8aa976d..c37a380ab0 100644
--- a/instrument/qemu-instr/control.h
+++ b/instrument/qemu-instr/control.h
@@ -80,6 +80,15 @@  void qi_set_fini(qi_fini_fn fn, void *data);
  */
 void qi_event_set_guest_cpu_enter(void (*fn)(QICPU vcpu));
 
+/*
+ * Hot-unplug a virtual (guest) CPU.
+ *
+ * Mode: user, softmmu
+ * Targets: all
+ * Time: exec
+ */
+void qi_event_set_guest_cpu_exit(void (*fn)(QICPU vcpu));
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/stubs/instrument.c b/stubs/instrument.c
index 658a872e1c..ea8df6d467 100644
--- a/stubs/instrument.c
+++ b/stubs/instrument.c
@@ -12,3 +12,4 @@ 
 
 __thread InstrState instr_cur_state;
 void (*instr_event__guest_cpu_enter)(QICPU *vcpu);
+void (*instr_event__guest_cpu_exit)(QICPU *vcpu);
diff --git a/trace/control.c b/trace/control.c
index 82d8989c4d..946a0af818 100644
--- a/trace/control.c
+++ b/trace/control.c
@@ -1,13 +1,14 @@ 
 /*
  * Interface for configuring and controlling the state of tracing events.
  *
- * Copyright (C) 2011-2016 Lluís Vilanova <vilanova@ac.upc.edu>
+ * Copyright (C) 2011-2017 Lluís Vilanova <vilanova@ac.upc.edu>
  *
  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  * See the COPYING file in the top-level directory.
  */
 
 #include "qemu/osdep.h"
+#include "instrument/events.h"
 #include "trace/control.h"
 #include "qemu/help_option.h"
 #ifdef CONFIG_TRACE_SIMPLE
@@ -272,6 +273,7 @@  void trace_fini_vcpu(CPUState *vcpu)
     TraceEventIter iter;
     TraceEvent *ev;
 
+    instr_guest_cpu_exit(vcpu);
     trace_guest_cpu_exit(vcpu);
 
     trace_event_iter_init(&iter, NULL);