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 "qapi/qmp/qdict.h" 18 #include "qemu-common.h" 19 #include "qemu/thread.h" 20 #include "qemu/notify.h" 21 #include "qapi-types.h" 22 #include "exec/cpu-common.h" 23 #include "qemu/coroutine_int.h" 24 25 /* State for the incoming migration */ 26 struct MigrationIncomingState { 27 QEMUFile *from_src_file; 28 29 /* 30 * Free at the start of the main state load, set as the main thread finishes 31 * loading state. 32 */ 33 QemuEvent main_thread_load_event; 34 35 size_t largest_page_size; 36 bool have_fault_thread; 37 QemuThread fault_thread; 38 QemuSemaphore fault_thread_sem; 39 40 bool have_listen_thread; 41 QemuThread listen_thread; 42 QemuSemaphore listen_thread_sem; 43 44 /* For the kernel to send us notifications */ 45 int userfault_fd; 46 /* To tell the fault_thread to quit */ 47 int userfault_quit_fd; 48 QEMUFile *to_src_file; 49 QemuMutex rp_mutex; /* We send replies from multiple threads */ 50 void *postcopy_tmp_page; 51 void *postcopy_tmp_zero_page; 52 53 QEMUBH *bh; 54 55 int state; 56 57 bool have_colo_incoming_thread; 58 QemuThread colo_incoming_thread; 59 /* The coroutine we should enter (back) after failover */ 60 Coroutine *migration_incoming_co; 61 QemuSemaphore colo_incoming_sem; 62 }; 63 64 MigrationIncomingState *migration_incoming_get_current(void); 65 void migration_incoming_state_destroy(void); 66 67 struct MigrationState 68 { 69 size_t bytes_xfer; 70 size_t xfer_limit; 71 QemuThread thread; 72 QEMUBH *cleanup_bh; 73 QEMUFile *to_dst_file; 74 75 /* params from 'migrate-set-parameters' */ 76 MigrationParameters parameters; 77 78 int state; 79 80 /* State related to return path */ 81 struct { 82 QEMUFile *from_dst_file; 83 QemuThread rp_thread; 84 bool error; 85 } rp_state; 86 87 double mbps; 88 int64_t total_time; 89 int64_t downtime; 90 int64_t expected_downtime; 91 bool enabled_capabilities[MIGRATION_CAPABILITY__MAX]; 92 int64_t xbzrle_cache_size; 93 int64_t setup_time; 94 95 /* Flag set once the migration has been asked to enter postcopy */ 96 bool start_postcopy; 97 /* Flag set after postcopy has sent the device state */ 98 bool postcopy_after_devices; 99 100 /* Flag set once the migration thread is running (and needs joining) */ 101 bool migration_thread_running; 102 103 /* Flag set once the migration thread called bdrv_inactivate_all */ 104 bool block_inactive; 105 106 /* The semaphore is used to notify COLO thread that failover is finished */ 107 QemuSemaphore colo_exit_sem; 108 109 /* The semaphore is used to notify COLO thread to do checkpoint */ 110 QemuSemaphore colo_checkpoint_sem; 111 int64_t colo_checkpoint_time; 112 QEMUTimer *colo_delay_timer; 113 114 /* The last error that occurred */ 115 Error *error; 116 /* Do we have to clean up -b/-i from old migrate parameters */ 117 /* This feature is deprecated and will be removed */ 118 bool must_remove_block_options; 119 }; 120 121 void migrate_set_state(int *state, int old_state, int new_state); 122 123 void migration_fd_process_incoming(QEMUFile *f); 124 125 uint64_t migrate_max_downtime(void); 126 127 void migrate_fd_error(MigrationState *s, const Error *error); 128 129 void migrate_fd_connect(MigrationState *s); 130 131 MigrationState *migrate_init(void); 132 bool migration_is_blocked(Error **errp); 133 /* True if outgoing migration has entered postcopy phase */ 134 bool migration_in_postcopy(void); 135 MigrationState *migrate_get_current(void); 136 137 bool migrate_release_ram(void); 138 bool migrate_postcopy_ram(void); 139 bool migrate_zero_blocks(void); 140 141 bool migrate_auto_converge(void); 142 143 int migrate_use_xbzrle(void); 144 int64_t migrate_xbzrle_cache_size(void); 145 bool migrate_colo_enabled(void); 146 147 bool migrate_use_block(void); 148 bool migrate_use_block_incremental(void); 149 150 bool migrate_use_compression(void); 151 int migrate_compress_level(void); 152 int migrate_compress_threads(void); 153 int migrate_decompress_threads(void); 154 bool migrate_use_events(void); 155 156 /* Sending on the return path - generic and then for each message type */ 157 void migrate_send_rp_shut(MigrationIncomingState *mis, 158 uint32_t value); 159 void migrate_send_rp_pong(MigrationIncomingState *mis, 160 uint32_t value); 161 void migrate_send_rp_req_pages(MigrationIncomingState *mis, const char* rbname, 162 ram_addr_t start, size_t len); 163 164 #endif 165