aaa2064c2a
Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Peter Xu <peterx@redhat.com>
364 lines
12 KiB
C
364 lines
12 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 "migration/vmstate.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 "qom/object.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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/* for vl.c */
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extern int only_migratable;
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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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/* 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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typedef QLIST_HEAD(, LoadStateEntry) LoadStateEntry_Head;
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/* The current postcopy state is read/set by postcopy_state_get/set
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* which update it atomically.
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* The state is updated as postcopy messages are received, and
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* in general only one thread should be writing to the state at any one
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* time, initially the main thread and then the listen thread;
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* Corner cases are where either thread finishes early and/or errors.
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* The state is checked as messages are received to ensure that
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* the source is sending us messages in the correct order.
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* The state is also used by the RAM reception code to know if it
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* has to place pages atomically, and the cleanup code at the end of
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* the main thread to know if it has to delay cleanup until the end
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* of postcopy.
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*/
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typedef enum {
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POSTCOPY_INCOMING_NONE = 0, /* Initial state - no postcopy */
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POSTCOPY_INCOMING_ADVISE,
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POSTCOPY_INCOMING_DISCARD,
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POSTCOPY_INCOMING_LISTENING,
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POSTCOPY_INCOMING_RUNNING,
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POSTCOPY_INCOMING_END
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} PostcopyState;
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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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/* See savevm.c */
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LoadStateEntry_Head loadvm_handlers;
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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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/* New style params from 'migrate-set-parameters' */
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MigrationParameters parameters;
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int state;
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/* Old style params from 'migrate' command */
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MigrationParams params;
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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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};
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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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void migration_channel_process_incoming(MigrationState *s,
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QIOChannel *ioc);
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void migration_tls_channel_process_incoming(MigrationState *s,
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QIOChannel *ioc,
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Error **errp);
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void migration_channel_connect(MigrationState *s,
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QIOChannel *ioc,
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const char *hostname);
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void migration_tls_channel_connect(MigrationState *s,
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QIOChannel *ioc,
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const char *hostname,
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Error **errp);
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uint64_t migrate_max_downtime(void);
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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 rdma_start_outgoing_migration(void *opaque, const char *host_port, Error **errp);
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void rdma_start_incoming_migration(const char *host_port, Error **errp);
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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(const MigrationParams *params);
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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(MigrationState *s);
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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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void migrate_compress_threads_create(void);
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void migrate_compress_threads_join(void);
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void migrate_decompress_threads_create(void);
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void migrate_decompress_threads_join(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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uint64_t ram_dirty_sync_count(void);
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uint64_t ram_dirty_pages_rate(void);
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uint64_t ram_postcopy_requests(void);
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void free_xbzrle_decoded_buf(void);
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void acct_update_position(QEMUFile *f, size_t size, bool zero);
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uint64_t dup_mig_pages_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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double xbzrle_mig_cache_miss_rate(void);
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void ram_handle_compressed(void *host, uint8_t ch, uint64_t size);
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void ram_debug_dump_bitmap(unsigned long *todump, bool expected);
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/* For outgoing discard bitmap */
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int ram_postcopy_send_discard_bitmap(MigrationState *ms);
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/* For incoming postcopy discard */
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int ram_discard_range(const char *block_name, uint64_t start, size_t length);
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int ram_postcopy_incoming_init(MigrationIncomingState *mis);
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void ram_postcopy_migrated_memory_release(MigrationState *ms);
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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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* @errp - [out] The reason (if any) we cannot block migration right now.
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*
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* @returns - 0 on success, -EBUSY/-EACCES on failure, with errp set.
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*/
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int migrate_add_blocker(Error *reason, Error **errp);
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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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int check_migratable(Object *obj, Error **err);
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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 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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bool migrate_colo_enabled(void);
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int64_t xbzrle_cache_resize(int64_t new_size);
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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 ram_mig_init(void);
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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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void migration_page_queue_free(void);
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int ram_save_queue_pages(const char *rbname, ram_addr_t start, ram_addr_t len);
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uint64_t ram_pagesize_summary(void);
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PostcopyState postcopy_state_get(void);
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/* Set the state and return the old state */
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PostcopyState postcopy_state_set(PostcopyState new_state);
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#endif
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