7b1e1a2202
All functions are internal except for ram_mig_init(). Create migration/misc.h for this kind of functions. Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
230 lines
7.1 KiB
C
230 lines
7.1 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-types.h"
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#include "exec/cpu-common.h"
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#include "qemu/coroutine_int.h"
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#define QEMU_VM_FILE_MAGIC 0x5145564d
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#define QEMU_VM_FILE_VERSION_COMPAT 0x00000002
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#define QEMU_VM_FILE_VERSION 0x00000003
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#define QEMU_VM_EOF 0x00
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#define QEMU_VM_SECTION_START 0x01
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#define QEMU_VM_SECTION_PART 0x02
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#define QEMU_VM_SECTION_END 0x03
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#define QEMU_VM_SECTION_FULL 0x04
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#define QEMU_VM_SUBSECTION 0x05
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#define QEMU_VM_VMDESCRIPTION 0x06
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#define QEMU_VM_CONFIGURATION 0x07
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#define QEMU_VM_COMMAND 0x08
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#define QEMU_VM_SECTION_FOOTER 0x7e
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/* Messages sent on the return path from destination to source */
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enum mig_rp_message_type {
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MIG_RP_MSG_INVALID = 0, /* Must be 0 */
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MIG_RP_MSG_SHUT, /* sibling will not send any more RP messages */
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MIG_RP_MSG_PONG, /* Response to a PING; data (seq: be32 ) */
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MIG_RP_MSG_REQ_PAGES_ID, /* data (start: be64, len: be32, id: string) */
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MIG_RP_MSG_REQ_PAGES, /* data (start: be64, len: be32) */
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MIG_RP_MSG_MAX
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};
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/* State for the incoming migration */
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struct MigrationIncomingState {
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QEMUFile *from_src_file;
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/*
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* Free at the start of the main state load, set as the main thread finishes
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* loading state.
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*/
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QemuEvent main_thread_load_event;
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size_t largest_page_size;
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bool have_fault_thread;
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QemuThread fault_thread;
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QemuSemaphore fault_thread_sem;
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bool have_listen_thread;
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QemuThread listen_thread;
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QemuSemaphore listen_thread_sem;
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/* For the kernel to send us notifications */
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int userfault_fd;
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/* To tell the fault_thread to quit */
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int userfault_quit_fd;
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QEMUFile *to_src_file;
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QemuMutex rp_mutex; /* We send replies from multiple threads */
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void *postcopy_tmp_page;
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void *postcopy_tmp_zero_page;
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QEMUBH *bh;
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int state;
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bool have_colo_incoming_thread;
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QemuThread colo_incoming_thread;
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/* The coroutine we should enter (back) after failover */
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Coroutine *migration_incoming_co;
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QemuSemaphore colo_incoming_sem;
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};
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MigrationIncomingState *migration_incoming_get_current(void);
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void migration_incoming_state_destroy(void);
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struct MigrationState
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{
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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 *to_dst_file;
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/* params from 'migrate-set-parameters' */
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MigrationParameters parameters;
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int state;
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/* State related to return path */
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struct {
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QEMUFile *from_dst_file;
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QemuThread rp_thread;
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bool error;
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} rp_state;
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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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bool enabled_capabilities[MIGRATION_CAPABILITY__MAX];
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int64_t xbzrle_cache_size;
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int64_t setup_time;
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/* Flag set once the migration has been asked to enter postcopy */
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bool start_postcopy;
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/* Flag set after postcopy has sent the device state */
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bool postcopy_after_devices;
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/* Flag set once the migration thread is running (and needs joining) */
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bool migration_thread_running;
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/* Flag set once the migration thread called bdrv_inactivate_all */
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bool block_inactive;
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/* The semaphore is used to notify COLO thread that failover is finished */
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QemuSemaphore colo_exit_sem;
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/* The semaphore is used to notify COLO thread to do checkpoint */
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QemuSemaphore colo_checkpoint_sem;
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int64_t colo_checkpoint_time;
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QEMUTimer *colo_delay_timer;
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/* The last error that occurred */
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Error *error;
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/* Do we have to clean up -b/-i from old migrate parameters */
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/* This feature is deprecated and will be removed */
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bool must_remove_block_options;
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};
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void migrate_set_state(int *state, int old_state, int new_state);
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void migration_fd_process_incoming(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 migrate_fd_error(MigrationState *s, const Error *error);
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void migrate_fd_connect(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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MigrationState *migrate_init(void);
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bool migration_is_blocked(Error **errp);
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bool migration_in_setup(MigrationState *);
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bool migration_is_idle(void);
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bool migration_has_finished(MigrationState *);
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bool migration_has_failed(MigrationState *);
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/* True if outgoing migration has entered postcopy phase */
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bool migration_in_postcopy(void);
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/* ...and after the device transmission */
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bool migration_in_postcopy_after_devices(MigrationState *);
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MigrationState *migrate_get_current(void);
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bool migrate_release_ram(void);
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bool migrate_postcopy_ram(void);
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bool migrate_zero_blocks(void);
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bool migrate_auto_converge(void);
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int migrate_use_xbzrle(void);
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int64_t migrate_xbzrle_cache_size(void);
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bool migrate_colo_enabled(void);
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bool migrate_use_block(void);
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bool migrate_use_block_incremental(void);
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bool migrate_use_compression(void);
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int migrate_compress_level(void);
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int migrate_compress_threads(void);
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int migrate_decompress_threads(void);
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bool migrate_use_events(void);
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/* Sending on the return path - generic and then for each message type */
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void migrate_send_rp_message(MigrationIncomingState *mis,
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enum mig_rp_message_type message_type,
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uint16_t len, void *data);
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void migrate_send_rp_shut(MigrationIncomingState *mis,
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uint32_t value);
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void migrate_send_rp_pong(MigrationIncomingState *mis,
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uint32_t value);
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void migrate_send_rp_req_pages(MigrationIncomingState *mis, const char* rbname,
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ram_addr_t start, size_t len);
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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, void *data);
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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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uint64_t *bytes_sent);
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void savevm_skip_section_footers(void);
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void register_global_state(void);
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void global_state_set_optional(void);
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void savevm_skip_configuration(void);
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int global_state_store(void);
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void global_state_store_running(void);
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#endif
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