Public API for parallel migration

This patch adds a new VIR_MIGRATE_PARALLEL flag for migration APIs which
will ask the hypervisor to use multiple parallel connections for
migrating a domain. The number of parallel connections can be set using
VIR_MIGRATE_PARAM_PARALLEL_CONNECTIONS typed parameter.
Signed-off-by: NJiri Denemark <jdenemar@redhat.com>
Reviewed-by: NJohn Ferlan <jferlan@redhat.com>

include/libvirt/libvirt-domain.h

@@ -831,6 +831,12 @@ typedef enum {
      */
     VIR_MIGRATE_TLS               = (1 << 16),
 
+    /* Send memory pages to the destination host through several network
+     * connections. See VIR_MIGRATE_PARAM_PARALLEL_* parameters for
+     * configuring the parallel migration.
+     */
+    VIR_MIGRATE_PARALLEL          = (1 << 17),
+
 } virDomainMigrateFlags;
 
 
@@ -1025,6 +1031,14 @@ typedef enum {
  */
 # define VIR_MIGRATE_PARAM_AUTO_CONVERGE_INCREMENT  "auto_converge.increment"
 
+/**
+ * VIR_MIGRATE_PARAM_PARALLEL_CONNECTIONS:
+ *
+ * virDomainMigrate* params field: number of connections used during parallel
+ * migration. As VIR_TYPED_PARAM_INT.
+ */
+# define VIR_MIGRATE_PARAM_PARALLEL_CONNECTIONS     "parallel.connections"
+
 /* Domain migration. */
 virDomainPtr virDomainMigrate (virDomainPtr domain, virConnectPtr dconn,
                                unsigned long flags, const char *dname,