Introduce Virtio-loopback epsilon release:

Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.

Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9

1 files changed, 44 insertions, 0 deletions

diff --git a/trace/event-internal.h b/trace/event-internal.h
new file mode 100644
index 000000000..f63500b37
--- /dev/null
+++ b/trace/event-internal.h
@@ -0,0 +1,44 @@
+/*
+ * Interface for configuring and controlling the state of tracing events.
+ *
+ * Copyright (C) 2012-2016 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.
+ */
+
+#ifndef TRACE__EVENT_INTERNAL_H
+#define TRACE__EVENT_INTERNAL_H
+
+/*
+ * Special value for TraceEvent.vcpu_id field to indicate
+ * that the event is not VCPU specific
+ */
+#define TRACE_VCPU_EVENT_NONE ((uint32_t)-1)
+
+/**
+ * TraceEvent:
+ * @id: Unique event identifier.
+ * @vcpu_id: Unique per-vCPU event identifier.
+ * @name: Event name.
+ * @sstate: Static tracing state.
+ * @dstate: Dynamic tracing state
+ *
+ * Interpretation of @dstate depends on whether the event has the 'vcpu'
+ *  property:
+ * - false: Boolean value indicating whether the event is active.
+ * - true : Integral counting the number of vCPUs that have this event enabled.
+ *
+ * Opaque generic description of a tracing event.
+ */
+typedef struct TraceEvent {
+    uint32_t id;
+    uint32_t vcpu_id;
+    const char * name;
+    const bool sstate;
+    uint16_t *dstate;
+} TraceEvent;
+
+void trace_event_set_state_dynamic_init(TraceEvent *ev, bool state);
+
+#endif /* TRACE__EVENT_INTERNAL_H */