4 * Copyright IBM, Corp. 2008
7 * Anthony Liguori <aliguori@us.ibm.com>
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
14 #ifndef QEMU_MIGRATION_H
15 #define QEMU_MIGRATION_H
17 #include "qapi/qmp/qdict.h"
18 #include "qemu-common.h"
19 #include "qemu/thread.h"
20 #include "qemu/notify.h"
21 #include "qapi/error.h"
22 #include "migration/vmstate.h"
23 #include "qapi-types.h"
24 #include "exec/cpu-common.h"
26 #define QEMU_VM_FILE_MAGIC 0x5145564d
27 #define QEMU_VM_FILE_VERSION_COMPAT 0x00000002
28 #define QEMU_VM_FILE_VERSION 0x00000003
30 #define QEMU_VM_EOF 0x00
31 #define QEMU_VM_SECTION_START 0x01
32 #define QEMU_VM_SECTION_PART 0x02
33 #define QEMU_VM_SECTION_END 0x03
34 #define QEMU_VM_SECTION_FULL 0x04
35 #define QEMU_VM_SUBSECTION 0x05
36 #define QEMU_VM_VMDESCRIPTION 0x06
37 #define QEMU_VM_CONFIGURATION 0x07
38 #define QEMU_VM_COMMAND 0x08
39 #define QEMU_VM_SECTION_FOOTER 0x7e
41 struct MigrationParams
{
46 typedef QLIST_HEAD(, LoadStateEntry
) LoadStateEntry_Head
;
47 /* State for the incoming migration */
48 struct MigrationIncomingState
{
49 QEMUFile
*from_src_file
;
51 QEMUFile
*to_src_file
;
54 LoadStateEntry_Head loadvm_handlers
;
57 MigrationIncomingState
*migration_incoming_get_current(void);
58 MigrationIncomingState
*migration_incoming_state_new(QEMUFile
*f
);
59 void migration_incoming_state_destroy(void);
63 int64_t bandwidth_limit
;
69 int parameters
[MIGRATION_PARAMETER_MAX
];
72 MigrationParams params
;
76 int64_t expected_downtime
;
77 int64_t dirty_pages_rate
;
78 int64_t dirty_bytes_rate
;
79 bool enabled_capabilities
[MIGRATION_CAPABILITY_MAX
];
80 int64_t xbzrle_cache_size
;
82 int64_t dirty_sync_count
;
85 void process_incoming_migration(QEMUFile
*f
);
87 void qemu_start_incoming_migration(const char *uri
, Error
**errp
);
89 uint64_t migrate_max_downtime(void);
91 void exec_start_incoming_migration(const char *host_port
, Error
**errp
);
93 void exec_start_outgoing_migration(MigrationState
*s
, const char *host_port
, Error
**errp
);
95 void tcp_start_incoming_migration(const char *host_port
, Error
**errp
);
97 void tcp_start_outgoing_migration(MigrationState
*s
, const char *host_port
, Error
**errp
);
99 void unix_start_incoming_migration(const char *path
, Error
**errp
);
101 void unix_start_outgoing_migration(MigrationState
*s
, const char *path
, Error
**errp
);
103 void fd_start_incoming_migration(const char *path
, Error
**errp
);
105 void fd_start_outgoing_migration(MigrationState
*s
, const char *fdname
, Error
**errp
);
107 void rdma_start_outgoing_migration(void *opaque
, const char *host_port
, Error
**errp
);
109 void rdma_start_incoming_migration(const char *host_port
, Error
**errp
);
111 void migrate_fd_error(MigrationState
*s
);
113 void migrate_fd_connect(MigrationState
*s
);
115 int migrate_fd_close(MigrationState
*s
);
117 void add_migration_state_change_notifier(Notifier
*notify
);
118 void remove_migration_state_change_notifier(Notifier
*notify
);
119 MigrationState
*migrate_init(const MigrationParams
*params
);
120 bool migration_in_setup(MigrationState
*);
121 bool migration_has_finished(MigrationState
*);
122 bool migration_has_failed(MigrationState
*);
123 MigrationState
*migrate_get_current(void);
125 void migrate_compress_threads_create(void);
126 void migrate_compress_threads_join(void);
127 void migrate_decompress_threads_create(void);
128 void migrate_decompress_threads_join(void);
129 uint64_t ram_bytes_remaining(void);
130 uint64_t ram_bytes_transferred(void);
131 uint64_t ram_bytes_total(void);
132 void free_xbzrle_decoded_buf(void);
134 void acct_update_position(QEMUFile
*f
, size_t size
, bool zero
);
136 uint64_t dup_mig_bytes_transferred(void);
137 uint64_t dup_mig_pages_transferred(void);
138 uint64_t skipped_mig_bytes_transferred(void);
139 uint64_t skipped_mig_pages_transferred(void);
140 uint64_t norm_mig_bytes_transferred(void);
141 uint64_t norm_mig_pages_transferred(void);
142 uint64_t xbzrle_mig_bytes_transferred(void);
143 uint64_t xbzrle_mig_pages_transferred(void);
144 uint64_t xbzrle_mig_pages_overflow(void);
145 uint64_t xbzrle_mig_pages_cache_miss(void);
146 double xbzrle_mig_cache_miss_rate(void);
148 void ram_handle_compressed(void *host
, uint8_t ch
, uint64_t size
);
149 void ram_debug_dump_bitmap(unsigned long *todump
, bool expected
);
152 * @migrate_add_blocker - prevent migration from proceeding
154 * @reason - an error to be returned whenever migration is attempted
156 void migrate_add_blocker(Error
*reason
);
159 * @migrate_del_blocker - remove a blocking error from migration
161 * @reason - the error blocking migration
163 void migrate_del_blocker(Error
*reason
);
165 bool migrate_zero_blocks(void);
167 bool migrate_auto_converge(void);
169 int xbzrle_encode_buffer(uint8_t *old_buf
, uint8_t *new_buf
, int slen
,
170 uint8_t *dst
, int dlen
);
171 int xbzrle_decode_buffer(uint8_t *src
, int slen
, uint8_t *dst
, int dlen
);
173 int migrate_use_xbzrle(void);
174 int64_t migrate_xbzrle_cache_size(void);
176 int64_t xbzrle_cache_resize(int64_t new_size
);
178 bool migrate_use_compression(void);
179 int migrate_compress_level(void);
180 int migrate_compress_threads(void);
181 int migrate_decompress_threads(void);
182 bool migrate_use_events(void);
184 void ram_control_before_iterate(QEMUFile
*f
, uint64_t flags
);
185 void ram_control_after_iterate(QEMUFile
*f
, uint64_t flags
);
186 void ram_control_load_hook(QEMUFile
*f
, uint64_t flags
, void *data
);
188 /* Whenever this is found in the data stream, the flags
189 * will be passed to ram_control_load_hook in the incoming-migration
190 * side. This lets before_ram_iterate/after_ram_iterate add
191 * transport-specific sections to the RAM migration data.
193 #define RAM_SAVE_FLAG_HOOK 0x80
195 #define RAM_SAVE_CONTROL_NOT_SUPP -1000
196 #define RAM_SAVE_CONTROL_DELAYED -2000
198 size_t ram_control_save_page(QEMUFile
*f
, ram_addr_t block_offset
,
199 ram_addr_t offset
, size_t size
,
200 uint64_t *bytes_sent
);
202 void ram_mig_init(void);
203 void savevm_skip_section_footers(void);
204 void register_global_state(void);
205 void global_state_set_optional(void);
206 void savevm_skip_configuration(void);
207 int global_state_store(void);
208 void global_state_store_running(void);