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, 95 insertions, 0 deletions

diff --git a/qapi/qmp-registry.c b/qapi/qmp-registry.c
new file mode 100644
index 000000000..485bc5e6f
--- /dev/null
+++ b/qapi/qmp-registry.c
@@ -0,0 +1,95 @@
+/*
+ * Core Definitions for QAPI/QMP Dispatch
+ *
+ * Copyright IBM, Corp. 2011
+ *
+ * Authors:
+ *  Anthony Liguori   <aliguori@us.ibm.com>
+ *  Michael Roth      <mdroth@us.ibm.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.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "qapi/qmp/dispatch.h"
+
+void qmp_register_command(QmpCommandList *cmds, const char *name,
+                          QmpCommandFunc *fn, QmpCommandOptions options,
+                          unsigned special_features)
+{
+    QmpCommand *cmd = g_malloc0(sizeof(*cmd));
+
+    /* QCO_COROUTINE and QCO_ALLOW_OOB are incompatible for now */
+    assert(!((options & QCO_COROUTINE) && (options & QCO_ALLOW_OOB)));
+
+    cmd->name = name;
+    cmd->fn = fn;
+    cmd->enabled = true;
+    cmd->options = options;
+    cmd->special_features = special_features;
+    QTAILQ_INSERT_TAIL(cmds, cmd, node);
+}
+
+const QmpCommand *qmp_find_command(const QmpCommandList *cmds, const char *name)
+{
+    QmpCommand *cmd;
+
+    QTAILQ_FOREACH(cmd, cmds, node) {
+        if (strcmp(cmd->name, name) == 0) {
+            return cmd;
+        }
+    }
+    return NULL;
+}
+
+static void qmp_toggle_command(QmpCommandList *cmds, const char *name,
+                               bool enabled, const char *disable_reason)
+{
+    QmpCommand *cmd;
+
+    QTAILQ_FOREACH(cmd, cmds, node) {
+        if (strcmp(cmd->name, name) == 0) {
+            cmd->enabled = enabled;
+            cmd->disable_reason = disable_reason;
+            return;
+        }
+    }
+}
+
+void qmp_disable_command(QmpCommandList *cmds, const char *name,
+                         const char *disable_reason)
+{
+    qmp_toggle_command(cmds, name, false, disable_reason);
+}
+
+void qmp_enable_command(QmpCommandList *cmds, const char *name)
+{
+    qmp_toggle_command(cmds, name, true, NULL);
+}
+
+bool qmp_command_is_enabled(const QmpCommand *cmd)
+{
+    return cmd->enabled;
+}
+
+const char *qmp_command_name(const QmpCommand *cmd)
+{
+    return cmd->name;
+}
+
+bool qmp_has_success_response(const QmpCommand *cmd)
+{
+    return !(cmd->options & QCO_NO_SUCCESS_RESP);
+}
+
+void qmp_for_each_command(const QmpCommandList *cmds, qmp_cmd_callback_fn fn,
+                          void *opaque)
+{
+    const QmpCommand *cmd;
+
+    QTAILQ_FOREACH(cmd, cmds, node) {
+        fn(cmd, opaque);
+    }
+}