Merge remote-tracking branch 'remotes/stefanha/tags/tracing-pull-request' into staging

# gpg: Signature made Fri 15 Sep 2017 18:39:41 BST
# gpg:                using RSA key 0x9CA4ABB381AB73C8
# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>"
# gpg:                 aka "Stefan Hajnoczi <stefanha@gmail.com>"
# Primary key fingerprint: 8695 A8BF D3F9 7CDA AC35  775A 9CA4 ABB3 81AB 73C8

* remotes/stefanha/tags/tracing-pull-request:
  trace: Immediately apply per-vCPU state changes if a vCPU is being created
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

trace/control-target.c

@@ -88,13 +88,17 @@ void trace_event_set_vcpu_state_dynamic(CPUState *vcpu,
             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);
+        if (vcpu->created) {
+            /*
+             * 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);
+        } else {
+            trace_event_synchronize_vcpu_state_dynamic(vcpu, RUN_ON_CPU_NULL);
+        }
     }
 }