1 /* 2 * QEMU live migration via generic fd 3 * 4 * Copyright Red Hat, Inc. 2009-2016 5 * 6 * Authors: 7 * Chris Lalancette <clalance@redhat.com> 8 * Daniel P. Berrange <berrange@redhat.com> 9 * 10 * This work is licensed under the terms of the GNU GPL, version 2. See 11 * the COPYING file in the top-level directory. 12 * 13 * Contributions after 2012-01-13 are licensed under the terms of the 14 * GNU GPL, version 2 or (at your option) any later version. 15 */ 16 17 #include "qemu/osdep.h" 18 #include "qapi/error.h" 19 #include "channel.h" 20 #include "fd.h" 21 #include "migration.h" 22 #include "monitor/monitor.h" 23 #include "io/channel-file.h" 24 #include "io/channel-util.h" 25 #include "options.h" 26 #include "trace.h" 27 28 29 static struct FdOutgoingArgs { 30 int fd; 31 } outgoing_args; 32 33 int fd_args_get_fd(void) 34 { 35 return outgoing_args.fd; 36 } 37 38 void fd_cleanup_outgoing_migration(void) 39 { 40 if (outgoing_args.fd > 0) { 41 close(outgoing_args.fd); 42 outgoing_args.fd = -1; 43 } 44 } 45 46 void fd_start_outgoing_migration(MigrationState *s, const char *fdname, Error **errp) 47 { 48 QIOChannel *ioc; 49 int fd = monitor_get_fd(monitor_cur(), fdname, errp); 50 51 outgoing_args.fd = -1; 52 53 if (fd == -1) { 54 return; 55 } 56 57 trace_migration_fd_outgoing(fd); 58 ioc = qio_channel_new_fd(fd, errp); 59 if (!ioc) { 60 close(fd); 61 return; 62 } 63 64 outgoing_args.fd = fd; 65 66 qio_channel_set_name(ioc, "migration-fd-outgoing"); 67 migration_channel_connect(s, ioc, NULL, NULL); 68 object_unref(OBJECT(ioc)); 69 } 70 71 static gboolean fd_accept_incoming_migration(QIOChannel *ioc, 72 GIOCondition condition, 73 gpointer opaque) 74 { 75 migration_channel_process_incoming(ioc); 76 object_unref(OBJECT(ioc)); 77 return G_SOURCE_REMOVE; 78 } 79 80 void fd_start_incoming_migration(const char *fdname, Error **errp) 81 { 82 QIOChannel *ioc; 83 int fd = monitor_fd_param(monitor_cur(), fdname, errp); 84 if (fd == -1) { 85 return; 86 } 87 88 trace_migration_fd_incoming(fd); 89 90 ioc = qio_channel_new_fd(fd, errp); 91 if (!ioc) { 92 close(fd); 93 return; 94 } 95 96 qio_channel_set_name(ioc, "migration-fd-incoming"); 97 qio_channel_add_watch_full(ioc, G_IO_IN, 98 fd_accept_incoming_migration, 99 NULL, NULL, 100 g_main_context_get_thread_default()); 101 102 if (migrate_multifd()) { 103 int channels = migrate_multifd_channels(); 104 105 while (channels--) { 106 ioc = QIO_CHANNEL(qio_channel_file_new_fd(dup(fd))); 107 108 if (QIO_CHANNEL_FILE(ioc)->fd == -1) { 109 error_setg(errp, "Failed to duplicate fd %d", fd); 110 return; 111 } 112 113 qio_channel_set_name(ioc, "migration-fd-incoming"); 114 qio_channel_add_watch_full(ioc, G_IO_IN, 115 fd_accept_incoming_migration, 116 NULL, NULL, 117 g_main_context_get_thread_default()); 118 } 119 } 120 } 121