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/*
* QEMU live migration
*
* Copyright IBM, Corp. 2008
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
*/
#ifndef QEMU_MIGRATION_H
#define QEMU_MIGRATION_H
#include "qapi/qmp/qdict.h"
#include "qemu-common.h"
#include "qemu/thread.h"
#include "qemu/notify.h"
#include "qapi/error.h"
#include "migration/vmstate.h"
#include "qapi-types.h"
#include "exec/cpu-common.h"
#define QEMU_VM_FILE_MAGIC 0x5145564d
#define QEMU_VM_FILE_VERSION_COMPAT 0x00000002
#define QEMU_VM_FILE_VERSION 0x00000003
#define QEMU_VM_EOF 0x00
#define QEMU_VM_SECTION_START 0x01
#define QEMU_VM_SECTION_PART 0x02
#define QEMU_VM_SECTION_END 0x03
#define QEMU_VM_SECTION_FULL 0x04
#define QEMU_VM_SUBSECTION 0x05
#define QEMU_VM_VMDESCRIPTION 0x06
#define QEMU_VM_CONFIGURATION 0x07
#define QEMU_VM_SECTION_FOOTER 0x7e
struct MigrationParams {
bool blk;
bool shared;
};
typedef struct MigrationState MigrationState;
typedef QLIST_HEAD(, LoadStateEntry) LoadStateEntry_Head;
/* State for the incoming migration */
struct MigrationIncomingState {
QEMUFile *file;
/* See savevm.c */
LoadStateEntry_Head loadvm_handlers;
};
MigrationIncomingState *migration_incoming_get_current(void);
MigrationIncomingState *migration_incoming_state_new(QEMUFile *f);
void migration_incoming_state_destroy(void);
struct MigrationState
{
int64_t bandwidth_limit;
size_t bytes_xfer;
size_t xfer_limit;
QemuThread thread;
QEMUBH *cleanup_bh;
QEMUFile *file;
int parameters[MIGRATION_PARAMETER_MAX];
int state;
MigrationParams params;
double mbps;
int64_t total_time;
int64_t downtime;
int64_t expected_downtime;
int64_t dirty_pages_rate;
int64_t dirty_bytes_rate;
bool enabled_capabilities[MIGRATION_CAPABILITY_MAX];
int64_t xbzrle_cache_size;
int64_t setup_time;
int64_t dirty_sync_count;
};
void process_incoming_migration(QEMUFile *f);
void qemu_start_incoming_migration(const char *uri, Error **errp);
uint64_t migrate_max_downtime(void);
void exec_start_incoming_migration(const char *host_port, Error **errp);
void exec_start_outgoing_migration(MigrationState *s, const char *host_port, Error **errp);
void tcp_start_incoming_migration(const char *host_port, Error **errp);
void tcp_start_outgoing_migration(MigrationState *s, const char *host_port, Error **errp);
void unix_start_incoming_migration(const char *path, Error **errp);
void unix_start_outgoing_migration(MigrationState *s, const char *path, Error **errp);
void fd_start_incoming_migration(const char *path, Error **errp);
void fd_start_outgoing_migration(MigrationState *s, const char *fdname, Error **errp);
void rdma_start_outgoing_migration(void *opaque, const char *host_port, Error **errp);
void rdma_start_incoming_migration(const char *host_port, Error **errp);
void migrate_fd_error(MigrationState *s);
void migrate_fd_connect(MigrationState *s);
int migrate_fd_close(MigrationState *s);
void add_migration_state_change_notifier(Notifier *notify);
void remove_migration_state_change_notifier(Notifier *notify);
bool migration_in_setup(MigrationState *);
bool migration_has_finished(MigrationState *);
bool migration_has_failed(MigrationState *);
MigrationState *migrate_get_current(void);
void migrate_compress_threads_create(void);
void migrate_compress_threads_join(void);
void migrate_decompress_threads_create(void);
void migrate_decompress_threads_join(void);
uint64_t ram_bytes_remaining(void);
uint64_t ram_bytes_transferred(void);
uint64_t ram_bytes_total(void);
void free_xbzrle_decoded_buf(void);
void acct_update_position(QEMUFile *f, size_t size, bool zero);
uint64_t dup_mig_bytes_transferred(void);
uint64_t dup_mig_pages_transferred(void);
uint64_t skipped_mig_bytes_transferred(void);
uint64_t skipped_mig_pages_transferred(void);
uint64_t norm_mig_bytes_transferred(void);
uint64_t norm_mig_pages_transferred(void);
uint64_t xbzrle_mig_bytes_transferred(void);
uint64_t xbzrle_mig_pages_transferred(void);
uint64_t xbzrle_mig_pages_overflow(void);
uint64_t xbzrle_mig_pages_cache_miss(void);
double xbzrle_mig_cache_miss_rate(void);
void ram_handle_compressed(void *host, uint8_t ch, uint64_t size);
/**
* @migrate_add_blocker - prevent migration from proceeding
*
* @reason - an error to be returned whenever migration is attempted
*/
void migrate_add_blocker(Error *reason);
/**
* @migrate_del_blocker - remove a blocking error from migration
*
* @reason - the error blocking migration
*/
void migrate_del_blocker(Error *reason);
bool migrate_zero_blocks(void);
bool migrate_auto_converge(void);
int xbzrle_encode_buffer(uint8_t *old_buf, uint8_t *new_buf, int slen,
uint8_t *dst, int dlen);
int xbzrle_decode_buffer(uint8_t *src, int slen, uint8_t *dst, int dlen);
int migrate_use_xbzrle(void);
int64_t migrate_xbzrle_cache_size(void);
int64_t xbzrle_cache_resize(int64_t new_size);
bool migrate_use_compression(void);
int migrate_compress_level(void);
int migrate_compress_threads(void);
int migrate_decompress_threads(void);
bool migrate_use_events(void);
void ram_control_before_iterate(QEMUFile *f, uint64_t flags);
void ram_control_after_iterate(QEMUFile *f, uint64_t flags);
void ram_control_load_hook(QEMUFile *f, uint64_t flags, void *data);
/* Whenever this is found in the data stream, the flags
* will be passed to ram_control_load_hook in the incoming-migration
* side. This lets before_ram_iterate/after_ram_iterate add
* transport-specific sections to the RAM migration data.
*/
#define RAM_SAVE_FLAG_HOOK 0x80
#define RAM_SAVE_CONTROL_NOT_SUPP -1000
#define RAM_SAVE_CONTROL_DELAYED -2000
size_t ram_control_save_page(QEMUFile *f, ram_addr_t block_offset,
ram_addr_t offset, size_t size,
uint64_t *bytes_sent);
void ram_mig_init(void);
void savevm_skip_section_footers(void);
void register_global_state(void);
void global_state_set_optional(void);
void savevm_skip_configuration(void);
int global_state_store(void);
#endif
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