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, 196 insertions, 0 deletions

diff --git a/migration/socket.c b/migration/socket.c
new file mode 100644
index 000000000..05705a32d
--- /dev/null
+++ b/migration/socket.c
@@ -0,0 +1,196 @@
+/*
+ * QEMU live migration via socket
+ *
+ * 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 "qemu/cutils.h"
+
+#include "qemu/error-report.h"
+#include "qapi/error.h"
+#include "channel.h"
+#include "socket.h"
+#include "migration.h"
+#include "qemu-file.h"
+#include "io/channel-socket.h"
+#include "io/net-listener.h"
+#include "trace.h"
+
+
+struct SocketOutgoingArgs {
+    SocketAddress *saddr;
+} outgoing_args;
+
+void socket_send_channel_create(QIOTaskFunc f, void *data)
+{
+    QIOChannelSocket *sioc = qio_channel_socket_new();
+    qio_channel_socket_connect_async(sioc, outgoing_args.saddr,
+                                     f, data, NULL, NULL);
+}
+
+int socket_send_channel_destroy(QIOChannel *send)
+{
+    /* Remove channel */
+    object_unref(OBJECT(send));
+    if (outgoing_args.saddr) {
+        qapi_free_SocketAddress(outgoing_args.saddr);
+        outgoing_args.saddr = NULL;
+    }
+    return 0;
+}
+
+struct SocketConnectData {
+    MigrationState *s;
+    char *hostname;
+};
+
+static void socket_connect_data_free(void *opaque)
+{
+    struct SocketConnectData *data = opaque;
+    if (!data) {
+        return;
+    }
+    g_free(data->hostname);
+    g_free(data);
+}
+
+static void socket_outgoing_migration(QIOTask *task,
+                                      gpointer opaque)
+{
+    struct SocketConnectData *data = opaque;
+    QIOChannel *sioc = QIO_CHANNEL(qio_task_get_source(task));
+    Error *err = NULL;
+
+    if (qio_task_propagate_error(task, &err)) {
+        trace_migration_socket_outgoing_error(error_get_pretty(err));
+    } else {
+        trace_migration_socket_outgoing_connected(data->hostname);
+    }
+    migration_channel_connect(data->s, sioc, data->hostname, err);
+    object_unref(OBJECT(sioc));
+}
+
+static void
+socket_start_outgoing_migration_internal(MigrationState *s,
+                                         SocketAddress *saddr,
+                                         Error **errp)
+{
+    QIOChannelSocket *sioc = qio_channel_socket_new();
+    struct SocketConnectData *data = g_new0(struct SocketConnectData, 1);
+
+    data->s = s;
+
+    /* in case previous migration leaked it */
+    qapi_free_SocketAddress(outgoing_args.saddr);
+    outgoing_args.saddr = saddr;
+
+    if (saddr->type == SOCKET_ADDRESS_TYPE_INET) {
+        data->hostname = g_strdup(saddr->u.inet.host);
+    }
+
+    qio_channel_set_name(QIO_CHANNEL(sioc), "migration-socket-outgoing");
+    qio_channel_socket_connect_async(sioc,
+                                     saddr,
+                                     socket_outgoing_migration,
+                                     data,
+                                     socket_connect_data_free,
+                                     NULL);
+}
+
+void socket_start_outgoing_migration(MigrationState *s,
+                                     const char *str,
+                                     Error **errp)
+{
+    Error *err = NULL;
+    SocketAddress *saddr = socket_parse(str, &err);
+    if (!err) {
+        socket_start_outgoing_migration_internal(s, saddr, &err);
+    }
+    error_propagate(errp, err);
+}
+
+static void socket_accept_incoming_migration(QIONetListener *listener,
+                                             QIOChannelSocket *cioc,
+                                             gpointer opaque)
+{
+    trace_migration_socket_incoming_accepted();
+
+    if (migration_has_all_channels()) {
+        error_report("%s: Extra incoming migration connection; ignoring",
+                     __func__);
+        return;
+    }
+
+    qio_channel_set_name(QIO_CHANNEL(cioc), "migration-socket-incoming");
+    migration_channel_process_incoming(QIO_CHANNEL(cioc));
+}
+
+static void
+socket_incoming_migration_end(void *opaque)
+{
+    QIONetListener *listener = opaque;
+
+    qio_net_listener_disconnect(listener);
+    object_unref(OBJECT(listener));
+}
+
+static void
+socket_start_incoming_migration_internal(SocketAddress *saddr,
+                                         Error **errp)
+{
+    QIONetListener *listener = qio_net_listener_new();
+    MigrationIncomingState *mis = migration_incoming_get_current();
+    size_t i;
+    int num = 1;
+
+    qio_net_listener_set_name(listener, "migration-socket-listener");
+
+    if (migrate_use_multifd()) {
+        num = migrate_multifd_channels();
+    }
+
+    if (qio_net_listener_open_sync(listener, saddr, num, errp) < 0) {
+        object_unref(OBJECT(listener));
+        return;
+    }
+
+    mis->transport_data = listener;
+    mis->transport_cleanup = socket_incoming_migration_end;
+
+    qio_net_listener_set_client_func_full(listener,
+                                          socket_accept_incoming_migration,
+                                          NULL, NULL,
+                                          g_main_context_get_thread_default());
+
+    for (i = 0; i < listener->nsioc; i++)  {
+        SocketAddress *address =
+            qio_channel_socket_get_local_address(listener->sioc[i], errp);
+        if (!address) {
+            return;
+        }
+        migrate_add_address(address);
+        qapi_free_SocketAddress(address);
+    }
+}
+
+void socket_start_incoming_migration(const char *str, Error **errp)
+{
+    Error *err = NULL;
+    SocketAddress *saddr = socket_parse(str, &err);
+    if (!err) {
+        socket_start_incoming_migration_internal(saddr, &err);
+    }
+    qapi_free_SocketAddress(saddr);
+    error_propagate(errp, err);
+}