323004a39d
this patch adds a efficient encoding for zero blocks by adding a new flag indicating a block is completely zero. additionally bdrv_write_zeros() is used at the destination to efficiently write these zeroes. depending on the implementation this avoids that the destination target gets fully provisioned. Signed-off-by: Peter Lieven <pl@kamp.de> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
159 lines
4.5 KiB
C
159 lines
4.5 KiB
C
/*
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* QEMU live migration
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*
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* Copyright IBM, Corp. 2008
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#ifndef QEMU_MIGRATION_H
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#define QEMU_MIGRATION_H
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#include "qapi/qmp/qdict.h"
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#include "qemu-common.h"
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#include "qemu/thread.h"
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#include "qemu/notify.h"
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#include "qapi/error.h"
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#include "migration/vmstate.h"
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#include "qapi-types.h"
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#include "exec/cpu-common.h"
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struct MigrationParams {
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bool blk;
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bool shared;
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};
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typedef struct MigrationState MigrationState;
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struct MigrationState
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{
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int64_t bandwidth_limit;
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size_t bytes_xfer;
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size_t xfer_limit;
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QemuThread thread;
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QEMUBH *cleanup_bh;
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QEMUFile *file;
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int state;
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MigrationParams params;
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double mbps;
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int64_t total_time;
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int64_t downtime;
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int64_t expected_downtime;
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int64_t dirty_pages_rate;
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int64_t dirty_bytes_rate;
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bool enabled_capabilities[MIGRATION_CAPABILITY_MAX];
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int64_t xbzrle_cache_size;
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};
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void process_incoming_migration(QEMUFile *f);
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void qemu_start_incoming_migration(const char *uri, Error **errp);
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uint64_t migrate_max_downtime(void);
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void do_info_migrate_print(Monitor *mon, const QObject *data);
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void do_info_migrate(Monitor *mon, QObject **ret_data);
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void exec_start_incoming_migration(const char *host_port, Error **errp);
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void exec_start_outgoing_migration(MigrationState *s, const char *host_port, Error **errp);
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void tcp_start_incoming_migration(const char *host_port, Error **errp);
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void tcp_start_outgoing_migration(MigrationState *s, const char *host_port, Error **errp);
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void unix_start_incoming_migration(const char *path, Error **errp);
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void unix_start_outgoing_migration(MigrationState *s, const char *path, Error **errp);
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void fd_start_incoming_migration(const char *path, Error **errp);
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void fd_start_outgoing_migration(MigrationState *s, const char *fdname, Error **errp);
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void migrate_fd_error(MigrationState *s);
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void migrate_fd_connect(MigrationState *s);
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int migrate_fd_close(MigrationState *s);
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void add_migration_state_change_notifier(Notifier *notify);
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void remove_migration_state_change_notifier(Notifier *notify);
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bool migration_is_active(MigrationState *);
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bool migration_has_finished(MigrationState *);
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bool migration_has_failed(MigrationState *);
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MigrationState *migrate_get_current(void);
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uint64_t ram_bytes_remaining(void);
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uint64_t ram_bytes_transferred(void);
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uint64_t ram_bytes_total(void);
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void acct_update_position(QEMUFile *f, size_t size, bool zero);
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extern SaveVMHandlers savevm_ram_handlers;
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uint64_t dup_mig_bytes_transferred(void);
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uint64_t dup_mig_pages_transferred(void);
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uint64_t skipped_mig_bytes_transferred(void);
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uint64_t skipped_mig_pages_transferred(void);
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uint64_t norm_mig_bytes_transferred(void);
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uint64_t norm_mig_pages_transferred(void);
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uint64_t xbzrle_mig_bytes_transferred(void);
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uint64_t xbzrle_mig_pages_transferred(void);
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uint64_t xbzrle_mig_pages_overflow(void);
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uint64_t xbzrle_mig_pages_cache_miss(void);
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/**
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* @migrate_add_blocker - prevent migration from proceeding
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*
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* @reason - an error to be returned whenever migration is attempted
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*/
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void migrate_add_blocker(Error *reason);
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/**
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* @migrate_del_blocker - remove a blocking error from migration
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*
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* @reason - the error blocking migration
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*/
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void migrate_del_blocker(Error *reason);
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bool migrate_rdma_pin_all(void);
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bool migrate_zero_blocks(void);
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bool migrate_auto_converge(void);
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int xbzrle_encode_buffer(uint8_t *old_buf, uint8_t *new_buf, int slen,
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uint8_t *dst, int dlen);
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int xbzrle_decode_buffer(uint8_t *src, int slen, uint8_t *dst, int dlen);
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int migrate_use_xbzrle(void);
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int64_t migrate_xbzrle_cache_size(void);
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int64_t xbzrle_cache_resize(int64_t new_size);
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void ram_control_before_iterate(QEMUFile *f, uint64_t flags);
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void ram_control_after_iterate(QEMUFile *f, uint64_t flags);
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void ram_control_load_hook(QEMUFile *f, uint64_t flags);
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/* Whenever this is found in the data stream, the flags
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* will be passed to ram_control_load_hook in the incoming-migration
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* side. This lets before_ram_iterate/after_ram_iterate add
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* transport-specific sections to the RAM migration data.
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*/
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#define RAM_SAVE_FLAG_HOOK 0x80
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#define RAM_SAVE_CONTROL_NOT_SUPP -1000
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#define RAM_SAVE_CONTROL_DELAYED -2000
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size_t ram_control_save_page(QEMUFile *f, ram_addr_t block_offset,
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ram_addr_t offset, size_t size,
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int *bytes_sent);
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#endif
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