1 /* 2 * QEMU live migration 3 * 4 * Copyright IBM, Corp. 2008 5 * 6 * Authors: 7 * Anthony Liguori <aliguori@us.ibm.com> 8 * 9 * This work is licensed under the terms of the GNU GPL, version 2. See 10 * the COPYING file in the top-level directory. 11 * 12 */ 13 14 #ifndef QEMU_MIGRATION_H 15 #define QEMU_MIGRATION_H 16 17 #include "qemu-common.h" 18 #include "qemu/thread.h" 19 #include "qapi-types.h" 20 #include "exec/cpu-common.h" 21 #include "qemu/coroutine_int.h" 22 #include "hw/qdev.h" 23 24 /* State for the incoming migration */ 25 struct MigrationIncomingState { 26 QEMUFile *from_src_file; 27 28 /* 29 * Free at the start of the main state load, set as the main thread finishes 30 * loading state. 31 */ 32 QemuEvent main_thread_load_event; 33 34 size_t largest_page_size; 35 bool have_fault_thread; 36 QemuThread fault_thread; 37 QemuSemaphore fault_thread_sem; 38 39 bool have_listen_thread; 40 QemuThread listen_thread; 41 QemuSemaphore listen_thread_sem; 42 43 /* For the kernel to send us notifications */ 44 int userfault_fd; 45 /* To tell the fault_thread to quit */ 46 int userfault_quit_fd; 47 QEMUFile *to_src_file; 48 QemuMutex rp_mutex; /* We send replies from multiple threads */ 49 void *postcopy_tmp_page; 50 void *postcopy_tmp_zero_page; 51 52 QEMUBH *bh; 53 54 int state; 55 56 bool have_colo_incoming_thread; 57 QemuThread colo_incoming_thread; 58 /* The coroutine we should enter (back) after failover */ 59 Coroutine *migration_incoming_co; 60 QemuSemaphore colo_incoming_sem; 61 }; 62 63 MigrationIncomingState *migration_incoming_get_current(void); 64 void migration_incoming_state_destroy(void); 65 66 #define TYPE_MIGRATION "migration" 67 68 #define MIGRATION_CLASS(klass) \ 69 OBJECT_CLASS_CHECK(MigrationClass, (klass), TYPE_MIGRATION) 70 #define MIGRATION_OBJ(obj) \ 71 OBJECT_CHECK(MigrationState, (obj), TYPE_MIGRATION) 72 #define MIGRATION_GET_CLASS(obj) \ 73 OBJECT_GET_CLASS(MigrationClass, (obj), TYPE_MIGRATION) 74 75 typedef struct MigrationClass { 76 /*< private >*/ 77 DeviceClass parent_class; 78 } MigrationClass; 79 80 struct MigrationState 81 { 82 /*< private >*/ 83 DeviceState parent_obj; 84 85 /*< public >*/ 86 size_t bytes_xfer; 87 size_t xfer_limit; 88 QemuThread thread; 89 QEMUBH *cleanup_bh; 90 QEMUFile *to_dst_file; 91 92 /* params from 'migrate-set-parameters' */ 93 MigrationParameters parameters; 94 95 int state; 96 97 /* State related to return path */ 98 struct { 99 QEMUFile *from_dst_file; 100 QemuThread rp_thread; 101 bool error; 102 } rp_state; 103 104 double mbps; 105 int64_t total_time; 106 int64_t downtime; 107 int64_t expected_downtime; 108 bool enabled_capabilities[MIGRATION_CAPABILITY__MAX]; 109 int64_t xbzrle_cache_size; 110 int64_t setup_time; 111 112 /* Flag set once the migration has been asked to enter postcopy */ 113 bool start_postcopy; 114 /* Flag set after postcopy has sent the device state */ 115 bool postcopy_after_devices; 116 117 /* Flag set once the migration thread is running (and needs joining) */ 118 bool migration_thread_running; 119 120 /* Flag set once the migration thread called bdrv_inactivate_all */ 121 bool block_inactive; 122 123 /* The semaphore is used to notify COLO thread that failover is finished */ 124 QemuSemaphore colo_exit_sem; 125 126 /* The semaphore is used to notify COLO thread to do checkpoint */ 127 QemuSemaphore colo_checkpoint_sem; 128 int64_t colo_checkpoint_time; 129 QEMUTimer *colo_delay_timer; 130 131 /* The last error that occurred */ 132 Error *error; 133 /* Do we have to clean up -b/-i from old migrate parameters */ 134 /* This feature is deprecated and will be removed */ 135 bool must_remove_block_options; 136 137 /* 138 * Global switch on whether we need to store the global state 139 * during migration. 140 */ 141 bool store_global_state; 142 143 /* Whether the VM is only allowing for migratable devices */ 144 bool only_migratable; 145 146 /* Whether we send QEMU_VM_CONFIGURATION during migration */ 147 bool send_configuration; 148 /* Whether we send section footer during migration */ 149 bool send_section_footer; 150 }; 151 152 void migrate_set_state(int *state, int old_state, int new_state); 153 154 void migration_fd_process_incoming(QEMUFile *f); 155 156 uint64_t migrate_max_downtime(void); 157 158 void migrate_fd_error(MigrationState *s, const Error *error); 159 160 void migrate_fd_connect(MigrationState *s); 161 162 MigrationState *migrate_init(void); 163 bool migration_is_blocked(Error **errp); 164 /* True if outgoing migration has entered postcopy phase */ 165 bool migration_in_postcopy(void); 166 MigrationState *migrate_get_current(void); 167 168 bool migrate_release_ram(void); 169 bool migrate_postcopy_ram(void); 170 bool migrate_zero_blocks(void); 171 172 bool migrate_auto_converge(void); 173 174 int migrate_use_xbzrle(void); 175 int64_t migrate_xbzrle_cache_size(void); 176 bool migrate_colo_enabled(void); 177 178 bool migrate_use_block(void); 179 bool migrate_use_block_incremental(void); 180 bool migrate_use_return_path(void); 181 182 bool migrate_use_compression(void); 183 int migrate_compress_level(void); 184 int migrate_compress_threads(void); 185 int migrate_decompress_threads(void); 186 bool migrate_use_events(void); 187 188 /* Sending on the return path - generic and then for each message type */ 189 void migrate_send_rp_shut(MigrationIncomingState *mis, 190 uint32_t value); 191 void migrate_send_rp_pong(MigrationIncomingState *mis, 192 uint32_t value); 193 void migrate_send_rp_req_pages(MigrationIncomingState *mis, const char* rbname, 194 ram_addr_t start, size_t len); 195 196 #endif 197