mirror of https://gitee.com/openkylin/qemu.git
206 lines
5.6 KiB
C
206 lines
5.6 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 "qemu-common.h"
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#include "qemu/thread.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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#include "hw/qdev.h"
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#include "io/channel.h"
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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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#define TYPE_MIGRATION "migration"
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#define MIGRATION_CLASS(klass) \
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OBJECT_CLASS_CHECK(MigrationClass, (klass), TYPE_MIGRATION)
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#define MIGRATION_OBJ(obj) \
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OBJECT_CHECK(MigrationState, (obj), TYPE_MIGRATION)
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#define MIGRATION_GET_CLASS(obj) \
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OBJECT_GET_CLASS(MigrationClass, (obj), TYPE_MIGRATION)
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typedef struct MigrationClass {
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/*< private >*/
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DeviceClass parent_class;
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} MigrationClass;
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struct MigrationState
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{
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/*< private >*/
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DeviceState parent_obj;
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/*< public >*/
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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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* Global switch on whether we need to store the global state
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* during migration.
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*/
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bool store_global_state;
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/* Whether the VM is only allowing for migratable devices */
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bool only_migratable;
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/* Whether we send QEMU_VM_CONFIGURATION during migration */
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bool send_configuration;
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/* Whether we send section footer during migration */
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bool send_section_footer;
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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 migration_ioc_process_incoming(QIOChannel *ioc);
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bool migration_has_all_channels(void);
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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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MigrationState *migrate_init(void);
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bool migration_is_blocked(Error **errp);
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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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MigrationState *migrate_get_current(void);
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bool migrate_postcopy(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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bool migrate_use_multifd(void);
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int migrate_multifd_channels(void);
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int migrate_multifd_page_count(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_return_path(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_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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#endif
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