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, 27 insertions, 0 deletions

diff --git a/include/qapi/forward-visitor.h b/include/qapi/forward-visitor.h
new file mode 100644
index 000000000..50fb3e9d5
--- /dev/null
+++ b/include/qapi/forward-visitor.h
@@ -0,0 +1,27 @@
+/*
+ * Forwarding visitor
+ *
+ * Copyright Red Hat, Inc. 2021
+ *
+ * Author: Paolo Bonzini <pbonzini@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
+ * See the COPYING.LIB file in the top-level directory.
+ *
+ */
+
+#ifndef FORWARD_VISITOR_H
+#define FORWARD_VISITOR_H
+
+#include "qapi/visitor.h"
+
+typedef struct ForwardFieldVisitor ForwardFieldVisitor;
+
+/*
+ * The forwarding visitor only expects a single name, @from, to be passed for
+ * toplevel fields.  It is converted to @to and forwarded to the @target visitor.
+ * Calls within a struct are forwarded without changing the name.
+ */
+Visitor *visitor_forward_field(Visitor *target, const char *from, const char *to);
+
+#endif