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, 73 insertions, 0 deletions

diff --git a/migration/exec.c b/migration/exec.c
new file mode 100644
index 000000000..375d2e1b5
--- /dev/null
+++ b/migration/exec.c
@@ -0,0 +1,73 @@
+/*
+ * QEMU live migration
+ *
+ * Copyright IBM, Corp. 2008
+ * Copyright Dell MessageOne 2008
+ * Copyright Red Hat, Inc. 2015-2016
+ *
+ * Authors:
+ *  Anthony Liguori   <aliguori@us.ibm.com>
+ *  Charles Duffy     <charles_duffy@messageone.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 "exec.h"
+#include "migration.h"
+#include "io/channel-command.h"
+#include "trace.h"
+
+
+void exec_start_outgoing_migration(MigrationState *s, const char *command, Error **errp)
+{
+    QIOChannel *ioc;
+    const char *argv[] = { "/bin/sh", "-c", command, NULL };
+
+    trace_migration_exec_outgoing(command);
+    ioc = QIO_CHANNEL(qio_channel_command_new_spawn(argv,
+                                                    O_RDWR,
+                                                    errp));
+    if (!ioc) {
+        return;
+    }
+
+    qio_channel_set_name(ioc, "migration-exec-outgoing");
+    migration_channel_connect(s, ioc, NULL, NULL);
+    object_unref(OBJECT(ioc));
+}
+
+static gboolean exec_accept_incoming_migration(QIOChannel *ioc,
+                                               GIOCondition condition,
+                                               gpointer opaque)
+{
+    migration_channel_process_incoming(ioc);
+    object_unref(OBJECT(ioc));
+    return G_SOURCE_REMOVE;
+}
+
+void exec_start_incoming_migration(const char *command, Error **errp)
+{
+    QIOChannel *ioc;
+    const char *argv[] = { "/bin/sh", "-c", command, NULL };
+
+    trace_migration_exec_incoming(command);
+    ioc = QIO_CHANNEL(qio_channel_command_new_spawn(argv,
+                                                    O_RDWR,
+                                                    errp));
+    if (!ioc) {
+        return;
+    }
+
+    qio_channel_set_name(ioc, "migration-exec-incoming");
+    qio_channel_add_watch_full(ioc, G_IO_IN,
+                               exec_accept_incoming_migration,
+                               NULL, NULL,
+                               g_main_context_get_thread_default());
+}