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 #include "vmstate.h"
  22 #include "qapi-types.h"
  23
  24 struct MigrationParams {
  25     bool blk;
  26     bool shared;
  27 };
  28
  29 typedef struct MigrationState MigrationState;
  30
  31 struct MigrationState
  32 {
  33     int64_t bandwidth_limit;
  34     QEMUFile *file;
  35     int fd;
  36     int state;
  37     int (*get_error)(MigrationState *s);
  38     int (*close)(MigrationState *s);
  39     int (*write)(MigrationState *s, const void *buff, size_t size);
  40     void *opaque;
  41     MigrationParams params;
  42     int64_t total_time;
  43     int64_t downtime;
  44     int64_t expected_downtime;
  45     int64_t dirty_pages_rate;
  46     bool enabled_capabilities[MIGRATION_CAPABILITY_MAX];
  47     int64_t xbzrle_cache_size;
  48 };
  49
  50 void process_incoming_migration(QEMUFile *f);
  51
  52 int qemu_start_incoming_migration(const char *uri, Error **errp);
  53
  54 uint64_t migrate_max_downtime(void);
  55
  56 void do_info_migrate_print(Monitor *mon, const QObject *data);
  57
  58 void do_info_migrate(Monitor *mon, QObject **ret_data);
  59
  60 int exec_start_incoming_migration(const char *host_port);
  61
  62 void exec_start_outgoing_migration(MigrationState *s, const char *host_port, Error **errp);
  63
  64 int tcp_start_incoming_migration(const char *host_port, Error **errp);
  65
  66 void tcp_start_outgoing_migration(MigrationState *s, const char *host_port, Error **errp);
  67
  68 int unix_start_incoming_migration(const char *path, Error **errp);
  69
  70 void unix_start_outgoing_migration(MigrationState *s, const char *path, Error **errp);
  71
  72 int fd_start_incoming_migration(const char *path);
  73
  74 void fd_start_outgoing_migration(MigrationState *s, const char *fdname, Error **errp);
  75
  76 void migrate_fd_error(MigrationState *s);
  77
  78 void migrate_fd_connect(MigrationState *s);
  79
  80 ssize_t migrate_fd_put_buffer(MigrationState *s, const void *data,
  81                               size_t size);
  82 void migrate_fd_put_ready(MigrationState *s);
  83 int migrate_fd_wait_for_unfreeze(MigrationState *s);
  84 int migrate_fd_close(MigrationState *s);
  85
  86 void add_migration_state_change_notifier(Notifier *notify);
  87 void remove_migration_state_change_notifier(Notifier *notify);
  88 bool migration_is_active(MigrationState *);
  89 bool migration_has_finished(MigrationState *);
  90 bool migration_has_failed(MigrationState *);
  91 MigrationState *migrate_get_current(void);
  92
  93 uint64_t ram_bytes_remaining(void);
  94 uint64_t ram_bytes_transferred(void);
  95 uint64_t ram_bytes_total(void);
  96
  97 extern SaveVMHandlers savevm_ram_handlers;
  98
  99 uint64_t dup_mig_bytes_transferred(void);
 100 uint64_t dup_mig_pages_transferred(void);
 101 uint64_t norm_mig_bytes_transferred(void);
 102 uint64_t norm_mig_pages_transferred(void);
 103 uint64_t xbzrle_mig_bytes_transferred(void);
 104 uint64_t xbzrle_mig_pages_transferred(void);
 105 uint64_t xbzrle_mig_pages_overflow(void);
 106 uint64_t xbzrle_mig_pages_cache_miss(void);
 107
 108 /**
 109  * @migrate_add_blocker - prevent migration from proceeding
 110  *
 111  * @reason - an error to be returned whenever migration is attempted
 112  */
 113 void migrate_add_blocker(Error *reason);
 114
 115 /**
 116  * @migrate_del_blocker - remove a blocking error from migration
 117  *
 118  * @reason - the error blocking migration
 119  */
 120 void migrate_del_blocker(Error *reason);
 121
 122 int xbzrle_encode_buffer(uint8_t *old_buf, uint8_t *new_buf, int slen,
 123                          uint8_t *dst, int dlen);
 124 int xbzrle_decode_buffer(uint8_t *src, int slen, uint8_t *dst, int dlen);
 125
 126 int migrate_use_xbzrle(void);
 127 int64_t migrate_xbzrle_cache_size(void);
 128
 129 int64_t xbzrle_cache_resize(int64_t new_size);
 130
 131 #endif