trace: Add event "guest_cpu_exit"

Signals the hot-unplugging of a virtual (guest) CPU.

Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
Message-id: 148278748597.1404.10546320797997984932.stgit@fimbulvetr.bsc.es
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
diff --git a/trace-events b/trace-events
index 2c66780..839a9d0 100644
--- a/trace-events
+++ b/trace-events
@@ -141,6 +141,12 @@
 # Targets: all
 vcpu guest_cpu_enter(void)
 
+# Hot-unplug a virtual (guest) CPU
+#
+# Mode: user, softmmu
+# Targets: all
+vcpu guest_cpu_exit(void)
+
 # Reset the state of a virtual (guest) CPU
 #
 # Mode: user, softmmu