blob: c1dcff0f9073311215da85da078eb7a1bdbb2ba4 [file] [log] [blame]
* QEMU migration vmstate registration
* Copyright IBM, Corp. 2008
* Authors:
* Anthony Liguori <>
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
#include "hw/vmstate-if.h"
typedef struct SaveVMHandlers {
/* This runs inside the iothread lock. */
SaveStateHandler *save_state;
void (*save_cleanup)(void *opaque);
int (*save_live_complete_postcopy)(QEMUFile *f, void *opaque);
int (*save_live_complete_precopy)(QEMUFile *f, void *opaque);
/* This runs both outside and inside the iothread lock. */
bool (*is_active)(void *opaque);
bool (*has_postcopy)(void *opaque);
/* is_active_iterate
* If it is not NULL then qemu_savevm_state_iterate will skip iteration if
* it returns false. For example, it is needed for only-postcopy-states,
* which needs to be handled by qemu_savevm_state_setup and
* qemu_savevm_state_pending, but do not need iterations until not in
* postcopy stage.
bool (*is_active_iterate)(void *opaque);
/* This runs outside the iothread lock in the migration case, and
* within the lock in the savevm case. The callback had better only
* use data that is local to the migration thread or protected
* by other locks.
int (*save_live_iterate)(QEMUFile *f, void *opaque);
/* This runs outside the iothread lock! */
int (*save_setup)(QEMUFile *f, void *opaque);
void (*save_live_pending)(QEMUFile *f, void *opaque,
uint64_t threshold_size,
uint64_t *res_precopy_only,
uint64_t *res_compatible,
uint64_t *res_postcopy_only);
/* Note for save_live_pending:
* - res_precopy_only is for data which must be migrated in precopy phase
* or in stopped state, in other words - before target vm start
* - res_compatible is for data which may be migrated in any phase
* - res_postcopy_only is for data which must be migrated in postcopy phase
* or in stopped state, in other words - after source vm stop
* Sum of res_postcopy_only, res_compatible and res_postcopy_only is the
* whole amount of pending data.
LoadStateHandler *load_state;
int (*load_setup)(QEMUFile *f, void *opaque);
int (*load_cleanup)(void *opaque);
/* Called when postcopy migration wants to resume from failure */
int (*resume_prepare)(MigrationState *s, void *opaque);
} SaveVMHandlers;
int register_savevm_live(const char *idstr,
uint32_t instance_id,
int version_id,
const SaveVMHandlers *ops,
void *opaque);
void unregister_savevm(VMStateIf *obj, const char *idstr, void *opaque);