migration.h

   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 "qdict.h"
  18 #include "qemu-common.h"
  19 #include "notify.h"
  20 #include "error.h"
  21
  22 struct MigrationParams {
  23     bool blk;
  24     bool shared;
  25 };
  26
  27 typedef struct MigrationState MigrationState;
  28
  29 struct MigrationState
  30 {
  31     int64_t bandwidth_limit;
  32     QEMUFile *file;
  33     int fd;
  34     int state;
  35     int (*get_error)(MigrationState *s);
  36     int (*close)(MigrationState *s);
  37     int (*write)(MigrationState *s, const void *buff, size_t size);
  38     void *opaque;
  39     MigrationParams params;
  40     int64_t total_time;
  41 };
  42
  43 void process_incoming_migration(QEMUFile *f);
  44
  45 int qemu_start_incoming_migration(const char *uri, Error **errp);
  46
  47 uint64_t migrate_max_downtime(void);
  48
  49 void do_info_migrate_print(Monitor *mon, const QObject *data);
  50
  51 void do_info_migrate(Monitor *mon, QObject **ret_data);
  52
  53 int exec_start_incoming_migration(const char *host_port);
  54
  55 int exec_start_outgoing_migration(MigrationState *s, const char *host_port);
  56
  57 int tcp_start_incoming_migration(const char *host_port, Error **errp);
  58
  59 int tcp_start_outgoing_migration(MigrationState *s, const char *host_port,
  60                                  Error **errp);
  61
  62 int unix_start_incoming_migration(const char *path);
  63
  64 int unix_start_outgoing_migration(MigrationState *s, const char *path);
  65
  66 int fd_start_incoming_migration(const char *path);
  67
  68 int fd_start_outgoing_migration(MigrationState *s, const char *fdname);
  69
  70 void migrate_fd_error(MigrationState *s);
  71
  72 void migrate_fd_connect(MigrationState *s);
  73
  74 void add_migration_state_change_notifier(Notifier *notify);
  75 void remove_migration_state_change_notifier(Notifier *notify);
  76 bool migration_is_active(MigrationState *);
  77 bool migration_has_finished(MigrationState *);
  78 bool migration_has_failed(MigrationState *);
  79
  80 uint64_t ram_bytes_remaining(void);
  81 uint64_t ram_bytes_transferred(void);
  82 uint64_t ram_bytes_total(void);
  83
  84 int ram_save_live(QEMUFile *f, int stage, void *opaque);
  85 int ram_load(QEMUFile *f, void *opaque, int version_id);
  86
  87 /**
  88  * @migrate_add_blocker - prevent migration from proceeding
  89  *
  90  * @reason - an error to be returned whenever migration is attempted
  91  */
  92 void migrate_add_blocker(Error *reason);
  93
  94 /**
  95  * @migrate_del_blocker - remove a blocking error from migration
  96  *
  97  * @reason - the error blocking migration
  98  */
  99 void migrate_del_blocker(Error *reason);
 100
 101 #endif