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, 76 insertions, 0 deletions

diff --git a/migration/fd.c b/migration/fd.c
new file mode 100644
index 000000000..6f2f50475
--- /dev/null
+++ b/migration/fd.c
@@ -0,0 +1,76 @@
+/*
+ * QEMU live migration via generic fd
+ *
+ * Copyright Red Hat, Inc. 2009-2016
+ *
+ * Authors:
+ *  Chris Lalancette <clalance@redhat.com>
+ *  Daniel P. Berrange <berrange@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ *
+ * Contributions after 2012-01-13 are licensed under the terms of the
+ * GNU GPL, version 2 or (at your option) any later version.
+ */
+
+#include "qemu/osdep.h"
+#include "channel.h"
+#include "fd.h"
+#include "migration.h"
+#include "monitor/monitor.h"
+#include "io/channel-util.h"
+#include "trace.h"
+
+
+void fd_start_outgoing_migration(MigrationState *s, const char *fdname, Error **errp)
+{
+    QIOChannel *ioc;
+    int fd = monitor_get_fd(monitor_cur(), fdname, errp);
+    if (fd == -1) {
+        return;
+    }
+
+    trace_migration_fd_outgoing(fd);
+    ioc = qio_channel_new_fd(fd, errp);
+    if (!ioc) {
+        close(fd);
+        return;
+    }
+
+    qio_channel_set_name(QIO_CHANNEL(ioc), "migration-fd-outgoing");
+    migration_channel_connect(s, ioc, NULL, NULL);
+    object_unref(OBJECT(ioc));
+}
+
+static gboolean fd_accept_incoming_migration(QIOChannel *ioc,
+                                             GIOCondition condition,
+                                             gpointer opaque)
+{
+    migration_channel_process_incoming(ioc);
+    object_unref(OBJECT(ioc));
+    return G_SOURCE_REMOVE;
+}
+
+void fd_start_incoming_migration(const char *fdname, Error **errp)
+{
+    QIOChannel *ioc;
+    int fd = monitor_fd_param(monitor_cur(), fdname, errp);
+    if (fd == -1) {
+        return;
+    }
+
+    trace_migration_fd_incoming(fd);
+
+    ioc = qio_channel_new_fd(fd, errp);
+    if (!ioc) {
+        close(fd);
+        return;
+    }
+
+    qio_channel_set_name(QIO_CHANNEL(ioc), "migration-fd-incoming");
+    qio_channel_add_watch_full(ioc, G_IO_IN,
+                               fd_accept_incoming_migration,
+                               NULL, NULL,
+                               g_main_context_get_thread_default());
+}