1 /* 2 * QEMU migration vmstate registration 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 MIGRATION_REGISTER_H 15 #define MIGRATION_REGISTER_H 16 17 typedef struct SaveVMHandlers { 18 /* This runs inside the iothread lock. */ 19 SaveStateHandler *save_state; 20 21 void (*save_cleanup)(void *opaque); 22 int (*save_live_complete_postcopy)(QEMUFile *f, void *opaque); 23 int (*save_live_complete_precopy)(QEMUFile *f, void *opaque); 24 25 /* This runs both outside and inside the iothread lock. */ 26 bool (*is_active)(void *opaque); 27 bool (*has_postcopy)(void *opaque); 28 29 /* is_active_iterate 30 * If it is not NULL then qemu_savevm_state_iterate will skip iteration if 31 * it returns false. For example, it is needed for only-postcopy-states, 32 * which needs to be handled by qemu_savevm_state_setup and 33 * qemu_savevm_state_pending, but do not need iterations until not in 34 * postcopy stage. 35 */ 36 bool (*is_active_iterate)(void *opaque); 37 38 /* This runs outside the iothread lock in the migration case, and 39 * within the lock in the savevm case. The callback had better only 40 * use data that is local to the migration thread or protected 41 * by other locks. 42 */ 43 int (*save_live_iterate)(QEMUFile *f, void *opaque); 44 45 /* This runs outside the iothread lock! */ 46 int (*save_setup)(QEMUFile *f, void *opaque); 47 void (*save_live_pending)(QEMUFile *f, void *opaque, 48 uint64_t threshold_size, 49 uint64_t *res_precopy_only, 50 uint64_t *res_compatible, 51 uint64_t *res_postcopy_only); 52 /* Note for save_live_pending: 53 * - res_precopy_only is for data which must be migrated in precopy phase 54 * or in stopped state, in other words - before target vm start 55 * - res_compatible is for data which may be migrated in any phase 56 * - res_postcopy_only is for data which must be migrated in postcopy phase 57 * or in stopped state, in other words - after source vm stop 58 * 59 * Sum of res_postcopy_only, res_compatible and res_postcopy_only is the 60 * whole amount of pending data. 61 */ 62 63 64 LoadStateHandler *load_state; 65 int (*load_setup)(QEMUFile *f, void *opaque); 66 int (*load_cleanup)(void *opaque); 67 /* Called when postcopy migration wants to resume from failure */ 68 int (*resume_prepare)(MigrationState *s, void *opaque); 69 } SaveVMHandlers; 70 71 int register_savevm_live(DeviceState *dev, 72 const char *idstr, 73 int instance_id, 74 int version_id, 75 SaveVMHandlers *ops, 76 void *opaque); 77 78 void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque); 79 80 #endif 81