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