mirror of https://gitee.com/openkylin/qemu.git
3636 lines
111 KiB
C
3636 lines
111 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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* Contributions after 2012-01-13 are licensed under the terms of the
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* GNU GPL, version 2 or (at your option) any later version.
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*/
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#include "qemu/osdep.h"
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#include "qemu/cutils.h"
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#include "qemu/error-report.h"
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#include "qemu/main-loop.h"
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#include "migration/blocker.h"
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#include "exec.h"
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#include "fd.h"
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#include "socket.h"
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#include "sysemu/runstate.h"
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#include "sysemu/sysemu.h"
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#include "rdma.h"
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#include "ram.h"
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#include "migration/global_state.h"
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#include "migration/misc.h"
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#include "migration.h"
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#include "savevm.h"
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#include "qemu-file-channel.h"
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#include "qemu-file.h"
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#include "migration/vmstate.h"
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#include "block/block.h"
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#include "qapi/error.h"
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#include "qapi/clone-visitor.h"
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#include "qapi/qapi-visit-sockets.h"
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#include "qapi/qapi-commands-migration.h"
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#include "qapi/qapi-events-migration.h"
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#include "qapi/qmp/qerror.h"
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#include "qapi/qmp/qnull.h"
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#include "qemu/rcu.h"
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#include "block.h"
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#include "postcopy-ram.h"
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#include "qemu/thread.h"
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#include "trace.h"
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#include "exec/target_page.h"
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#include "io/channel-buffer.h"
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#include "migration/colo.h"
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#include "hw/boards.h"
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#include "hw/qdev-properties.h"
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#include "monitor/monitor.h"
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#include "net/announce.h"
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#include "qemu/queue.h"
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#define MAX_THROTTLE (32 << 20) /* Migration transfer speed throttling */
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/* Amount of time to allocate to each "chunk" of bandwidth-throttled
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* data. */
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#define BUFFER_DELAY 100
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#define XFER_LIMIT_RATIO (1000 / BUFFER_DELAY)
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/* Time in milliseconds we are allowed to stop the source,
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* for sending the last part */
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#define DEFAULT_MIGRATE_SET_DOWNTIME 300
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/* Maximum migrate downtime set to 2000 seconds */
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#define MAX_MIGRATE_DOWNTIME_SECONDS 2000
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#define MAX_MIGRATE_DOWNTIME (MAX_MIGRATE_DOWNTIME_SECONDS * 1000)
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/* Default compression thread count */
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#define DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT 8
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/* Default decompression thread count, usually decompression is at
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* least 4 times as fast as compression.*/
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#define DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT 2
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/*0: means nocompress, 1: best speed, ... 9: best compress ratio */
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#define DEFAULT_MIGRATE_COMPRESS_LEVEL 1
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/* Define default autoconverge cpu throttle migration parameters */
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#define DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL 20
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#define DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT 10
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#define DEFAULT_MIGRATE_MAX_CPU_THROTTLE 99
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/* Migration XBZRLE default cache size */
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#define DEFAULT_MIGRATE_XBZRLE_CACHE_SIZE (64 * 1024 * 1024)
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/* The delay time (in ms) between two COLO checkpoints */
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#define DEFAULT_MIGRATE_X_CHECKPOINT_DELAY (200 * 100)
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#define DEFAULT_MIGRATE_MULTIFD_CHANNELS 2
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/* Background transfer rate for postcopy, 0 means unlimited, note
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* that page requests can still exceed this limit.
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*/
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#define DEFAULT_MIGRATE_MAX_POSTCOPY_BANDWIDTH 0
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/*
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* Parameters for self_announce_delay giving a stream of RARP/ARP
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* packets after migration.
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*/
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#define DEFAULT_MIGRATE_ANNOUNCE_INITIAL 50
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#define DEFAULT_MIGRATE_ANNOUNCE_MAX 550
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#define DEFAULT_MIGRATE_ANNOUNCE_ROUNDS 5
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#define DEFAULT_MIGRATE_ANNOUNCE_STEP 100
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static NotifierList migration_state_notifiers =
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NOTIFIER_LIST_INITIALIZER(migration_state_notifiers);
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static bool deferred_incoming;
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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_RECV_BITMAP, /* send recved_bitmap back to source */
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MIG_RP_MSG_RESUME_ACK, /* tell source that we are ready to resume */
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MIG_RP_MSG_MAX
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};
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/* When we add fault tolerance, we could have several
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migrations at once. For now we don't need to add
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dynamic creation of migration */
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static MigrationState *current_migration;
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static MigrationIncomingState *current_incoming;
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static bool migration_object_check(MigrationState *ms, Error **errp);
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static int migration_maybe_pause(MigrationState *s,
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int *current_active_state,
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int new_state);
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static void migrate_fd_cancel(MigrationState *s);
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void migration_object_init(void)
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{
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MachineState *ms = MACHINE(qdev_get_machine());
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Error *err = NULL;
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/* This can only be called once. */
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assert(!current_migration);
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current_migration = MIGRATION_OBJ(object_new(TYPE_MIGRATION));
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/*
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* Init the migrate incoming object as well no matter whether
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* we'll use it or not.
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*/
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assert(!current_incoming);
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current_incoming = g_new0(MigrationIncomingState, 1);
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current_incoming->state = MIGRATION_STATUS_NONE;
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current_incoming->postcopy_remote_fds =
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g_array_new(FALSE, TRUE, sizeof(struct PostCopyFD));
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qemu_mutex_init(¤t_incoming->rp_mutex);
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qemu_event_init(¤t_incoming->main_thread_load_event, false);
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qemu_sem_init(¤t_incoming->postcopy_pause_sem_dst, 0);
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qemu_sem_init(¤t_incoming->postcopy_pause_sem_fault, 0);
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init_dirty_bitmap_incoming_migration();
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if (!migration_object_check(current_migration, &err)) {
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error_report_err(err);
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exit(1);
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}
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/*
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* We cannot really do this in migration_instance_init() since at
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* that time global properties are not yet applied, then this
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* value will be definitely replaced by something else.
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*/
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if (ms->enforce_config_section) {
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current_migration->send_configuration = true;
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}
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}
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void migration_shutdown(void)
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{
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/*
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* Cancel the current migration - that will (eventually)
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* stop the migration using this structure
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*/
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migrate_fd_cancel(current_migration);
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object_unref(OBJECT(current_migration));
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}
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/* For outgoing */
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MigrationState *migrate_get_current(void)
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{
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/* This can only be called after the object created. */
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assert(current_migration);
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return current_migration;
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}
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MigrationIncomingState *migration_incoming_get_current(void)
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{
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assert(current_incoming);
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return current_incoming;
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}
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void migration_incoming_state_destroy(void)
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{
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struct MigrationIncomingState *mis = migration_incoming_get_current();
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if (mis->to_src_file) {
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/* Tell source that we are done */
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migrate_send_rp_shut(mis, qemu_file_get_error(mis->from_src_file) != 0);
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qemu_fclose(mis->to_src_file);
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mis->to_src_file = NULL;
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}
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if (mis->from_src_file) {
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qemu_fclose(mis->from_src_file);
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mis->from_src_file = NULL;
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}
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if (mis->postcopy_remote_fds) {
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g_array_free(mis->postcopy_remote_fds, TRUE);
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mis->postcopy_remote_fds = NULL;
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}
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qemu_event_reset(&mis->main_thread_load_event);
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if (mis->socket_address_list) {
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qapi_free_SocketAddressList(mis->socket_address_list);
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mis->socket_address_list = NULL;
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}
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}
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static void migrate_generate_event(int new_state)
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{
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if (migrate_use_events()) {
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qapi_event_send_migration(new_state);
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}
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}
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static bool migrate_late_block_activate(void)
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{
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MigrationState *s;
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s = migrate_get_current();
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return s->enabled_capabilities[
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MIGRATION_CAPABILITY_LATE_BLOCK_ACTIVATE];
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}
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/*
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* Called on -incoming with a defer: uri.
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* The migration can be started later after any parameters have been
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* changed.
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*/
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static void deferred_incoming_migration(Error **errp)
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{
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if (deferred_incoming) {
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error_setg(errp, "Incoming migration already deferred");
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}
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deferred_incoming = true;
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}
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/*
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* Send a message on the return channel back to the source
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* of the migration.
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*/
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static int 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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{
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int ret = 0;
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trace_migrate_send_rp_message((int)message_type, len);
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qemu_mutex_lock(&mis->rp_mutex);
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/*
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* It's possible that the file handle got lost due to network
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* failures.
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*/
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if (!mis->to_src_file) {
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ret = -EIO;
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goto error;
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}
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qemu_put_be16(mis->to_src_file, (unsigned int)message_type);
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qemu_put_be16(mis->to_src_file, len);
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qemu_put_buffer(mis->to_src_file, data, len);
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qemu_fflush(mis->to_src_file);
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/* It's possible that qemu file got error during sending */
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ret = qemu_file_get_error(mis->to_src_file);
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error:
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qemu_mutex_unlock(&mis->rp_mutex);
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return ret;
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}
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/* Request a range of pages from the source VM at the given
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* start address.
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* rbname: Name of the RAMBlock to request the page in, if NULL it's the same
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* as the last request (a name must have been given previously)
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* Start: Address offset within the RB
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* Len: Length in bytes required - must be a multiple of pagesize
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*/
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int 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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{
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uint8_t bufc[12 + 1 + 255]; /* start (8), len (4), rbname up to 256 */
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size_t msglen = 12; /* start + len */
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enum mig_rp_message_type msg_type;
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*(uint64_t *)bufc = cpu_to_be64((uint64_t)start);
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*(uint32_t *)(bufc + 8) = cpu_to_be32((uint32_t)len);
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if (rbname) {
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int rbname_len = strlen(rbname);
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assert(rbname_len < 256);
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bufc[msglen++] = rbname_len;
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memcpy(bufc + msglen, rbname, rbname_len);
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msglen += rbname_len;
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msg_type = MIG_RP_MSG_REQ_PAGES_ID;
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} else {
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msg_type = MIG_RP_MSG_REQ_PAGES;
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}
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return migrate_send_rp_message(mis, msg_type, msglen, bufc);
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}
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static bool migration_colo_enabled;
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bool migration_incoming_colo_enabled(void)
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{
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return migration_colo_enabled;
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}
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void migration_incoming_disable_colo(void)
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{
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migration_colo_enabled = false;
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}
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void migration_incoming_enable_colo(void)
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{
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migration_colo_enabled = true;
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}
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void migrate_add_address(SocketAddress *address)
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{
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MigrationIncomingState *mis = migration_incoming_get_current();
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SocketAddressList *addrs;
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addrs = g_new0(SocketAddressList, 1);
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addrs->next = mis->socket_address_list;
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mis->socket_address_list = addrs;
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addrs->value = QAPI_CLONE(SocketAddress, address);
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}
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void qemu_start_incoming_migration(const char *uri, Error **errp)
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{
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const char *p;
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qapi_event_send_migration(MIGRATION_STATUS_SETUP);
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if (!strcmp(uri, "defer")) {
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deferred_incoming_migration(errp);
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} else if (strstart(uri, "tcp:", &p)) {
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tcp_start_incoming_migration(p, errp);
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#ifdef CONFIG_RDMA
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} else if (strstart(uri, "rdma:", &p)) {
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rdma_start_incoming_migration(p, errp);
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#endif
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} else if (strstart(uri, "exec:", &p)) {
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exec_start_incoming_migration(p, errp);
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} else if (strstart(uri, "unix:", &p)) {
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unix_start_incoming_migration(p, errp);
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} else if (strstart(uri, "fd:", &p)) {
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fd_start_incoming_migration(p, errp);
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} else {
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error_setg(errp, "unknown migration protocol: %s", uri);
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}
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}
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static void process_incoming_migration_bh(void *opaque)
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{
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Error *local_err = NULL;
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MigrationIncomingState *mis = opaque;
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/* If capability late_block_activate is set:
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* Only fire up the block code now if we're going to restart the
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* VM, else 'cont' will do it.
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* This causes file locking to happen; so we don't want it to happen
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* unless we really are starting the VM.
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*/
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if (!migrate_late_block_activate() ||
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(autostart && (!global_state_received() ||
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global_state_get_runstate() == RUN_STATE_RUNNING))) {
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/* Make sure all file formats flush their mutable metadata.
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* If we get an error here, just don't restart the VM yet. */
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bdrv_invalidate_cache_all(&local_err);
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if (local_err) {
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error_report_err(local_err);
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local_err = NULL;
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autostart = false;
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}
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}
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/*
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* This must happen after all error conditions are dealt with and
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* we're sure the VM is going to be running on this host.
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*/
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qemu_announce_self(&mis->announce_timer, migrate_announce_params());
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if (multifd_load_cleanup(&local_err) != 0) {
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error_report_err(local_err);
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autostart = false;
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}
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/* If global state section was not received or we are in running
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state, we need to obey autostart. Any other state is set with
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runstate_set. */
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dirty_bitmap_mig_before_vm_start();
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if (!global_state_received() ||
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global_state_get_runstate() == RUN_STATE_RUNNING) {
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if (autostart) {
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vm_start();
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} else {
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runstate_set(RUN_STATE_PAUSED);
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}
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} else if (migration_incoming_colo_enabled()) {
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migration_incoming_disable_colo();
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vm_start();
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} else {
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runstate_set(global_state_get_runstate());
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}
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/*
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* This must happen after any state changes since as soon as an external
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* observer sees this event they might start to prod at the VM assuming
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* it's ready to use.
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*/
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migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE,
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MIGRATION_STATUS_COMPLETED);
|
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qemu_bh_delete(mis->bh);
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migration_incoming_state_destroy();
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}
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static void process_incoming_migration_co(void *opaque)
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{
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MigrationIncomingState *mis = migration_incoming_get_current();
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PostcopyState ps;
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int ret;
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Error *local_err = NULL;
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assert(mis->from_src_file);
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mis->migration_incoming_co = qemu_coroutine_self();
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mis->largest_page_size = qemu_ram_pagesize_largest();
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postcopy_state_set(POSTCOPY_INCOMING_NONE);
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migrate_set_state(&mis->state, MIGRATION_STATUS_NONE,
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MIGRATION_STATUS_ACTIVE);
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ret = qemu_loadvm_state(mis->from_src_file);
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|
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ps = postcopy_state_get();
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trace_process_incoming_migration_co_end(ret, ps);
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if (ps != POSTCOPY_INCOMING_NONE) {
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if (ps == POSTCOPY_INCOMING_ADVISE) {
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/*
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* Where a migration had postcopy enabled (and thus went to advise)
|
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* but managed to complete within the precopy period, we can use
|
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* the normal exit.
|
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*/
|
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postcopy_ram_incoming_cleanup(mis);
|
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} else if (ret >= 0) {
|
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/*
|
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* Postcopy was started, cleanup should happen at the end of the
|
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* postcopy thread.
|
|
*/
|
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trace_process_incoming_migration_co_postcopy_end_main();
|
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return;
|
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}
|
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/* Else if something went wrong then just fall out of the normal exit */
|
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}
|
|
|
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/* we get COLO info, and know if we are in COLO mode */
|
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if (!ret && migration_incoming_colo_enabled()) {
|
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/* Make sure all file formats flush their mutable metadata */
|
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bdrv_invalidate_cache_all(&local_err);
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if (local_err) {
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error_report_err(local_err);
|
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goto fail;
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}
|
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|
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if (colo_init_ram_cache() < 0) {
|
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error_report("Init ram cache failed");
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goto fail;
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}
|
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|
|
qemu_thread_create(&mis->colo_incoming_thread, "COLO incoming",
|
|
colo_process_incoming_thread, mis, QEMU_THREAD_JOINABLE);
|
|
mis->have_colo_incoming_thread = true;
|
|
qemu_coroutine_yield();
|
|
|
|
/* Wait checkpoint incoming thread exit before free resource */
|
|
qemu_thread_join(&mis->colo_incoming_thread);
|
|
/* We hold the global iothread lock, so it is safe here */
|
|
colo_release_ram_cache();
|
|
}
|
|
|
|
if (ret < 0) {
|
|
error_report("load of migration failed: %s", strerror(-ret));
|
|
goto fail;
|
|
}
|
|
mis->bh = qemu_bh_new(process_incoming_migration_bh, mis);
|
|
qemu_bh_schedule(mis->bh);
|
|
mis->migration_incoming_co = NULL;
|
|
return;
|
|
fail:
|
|
local_err = NULL;
|
|
migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE,
|
|
MIGRATION_STATUS_FAILED);
|
|
qemu_fclose(mis->from_src_file);
|
|
if (multifd_load_cleanup(&local_err) != 0) {
|
|
error_report_err(local_err);
|
|
}
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
static void migration_incoming_setup(QEMUFile *f)
|
|
{
|
|
MigrationIncomingState *mis = migration_incoming_get_current();
|
|
|
|
if (multifd_load_setup() != 0) {
|
|
/* We haven't been able to create multifd threads
|
|
nothing better to do */
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
if (!mis->from_src_file) {
|
|
mis->from_src_file = f;
|
|
}
|
|
qemu_file_set_blocking(f, false);
|
|
}
|
|
|
|
void migration_incoming_process(void)
|
|
{
|
|
Coroutine *co = qemu_coroutine_create(process_incoming_migration_co, NULL);
|
|
qemu_coroutine_enter(co);
|
|
}
|
|
|
|
/* Returns true if recovered from a paused migration, otherwise false */
|
|
static bool postcopy_try_recover(QEMUFile *f)
|
|
{
|
|
MigrationIncomingState *mis = migration_incoming_get_current();
|
|
|
|
if (mis->state == MIGRATION_STATUS_POSTCOPY_PAUSED) {
|
|
/* Resumed from a paused postcopy migration */
|
|
|
|
mis->from_src_file = f;
|
|
/* Postcopy has standalone thread to do vm load */
|
|
qemu_file_set_blocking(f, true);
|
|
|
|
/* Re-configure the return path */
|
|
mis->to_src_file = qemu_file_get_return_path(f);
|
|
|
|
migrate_set_state(&mis->state, MIGRATION_STATUS_POSTCOPY_PAUSED,
|
|
MIGRATION_STATUS_POSTCOPY_RECOVER);
|
|
|
|
/*
|
|
* Here, we only wake up the main loading thread (while the
|
|
* fault thread will still be waiting), so that we can receive
|
|
* commands from source now, and answer it if needed. The
|
|
* fault thread will be woken up afterwards until we are sure
|
|
* that source is ready to reply to page requests.
|
|
*/
|
|
qemu_sem_post(&mis->postcopy_pause_sem_dst);
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
void migration_fd_process_incoming(QEMUFile *f)
|
|
{
|
|
if (postcopy_try_recover(f)) {
|
|
return;
|
|
}
|
|
|
|
migration_incoming_setup(f);
|
|
migration_incoming_process();
|
|
}
|
|
|
|
void migration_ioc_process_incoming(QIOChannel *ioc, Error **errp)
|
|
{
|
|
MigrationIncomingState *mis = migration_incoming_get_current();
|
|
bool start_migration;
|
|
|
|
if (!mis->from_src_file) {
|
|
/* The first connection (multifd may have multiple) */
|
|
QEMUFile *f = qemu_fopen_channel_input(ioc);
|
|
|
|
/* If it's a recovery, we're done */
|
|
if (postcopy_try_recover(f)) {
|
|
return;
|
|
}
|
|
|
|
migration_incoming_setup(f);
|
|
|
|
/*
|
|
* Common migration only needs one channel, so we can start
|
|
* right now. Multifd needs more than one channel, we wait.
|
|
*/
|
|
start_migration = !migrate_use_multifd();
|
|
} else {
|
|
Error *local_err = NULL;
|
|
/* Multiple connections */
|
|
assert(migrate_use_multifd());
|
|
start_migration = multifd_recv_new_channel(ioc, &local_err);
|
|
if (local_err) {
|
|
error_propagate(errp, local_err);
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (start_migration) {
|
|
migration_incoming_process();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @migration_has_all_channels: We have received all channels that we need
|
|
*
|
|
* Returns true when we have got connections to all the channels that
|
|
* we need for migration.
|
|
*/
|
|
bool migration_has_all_channels(void)
|
|
{
|
|
MigrationIncomingState *mis = migration_incoming_get_current();
|
|
bool all_channels;
|
|
|
|
all_channels = multifd_recv_all_channels_created();
|
|
|
|
return all_channels && mis->from_src_file != NULL;
|
|
}
|
|
|
|
/*
|
|
* Send a 'SHUT' message on the return channel with the given value
|
|
* to indicate that we've finished with the RP. Non-0 value indicates
|
|
* error.
|
|
*/
|
|
void migrate_send_rp_shut(MigrationIncomingState *mis,
|
|
uint32_t value)
|
|
{
|
|
uint32_t buf;
|
|
|
|
buf = cpu_to_be32(value);
|
|
migrate_send_rp_message(mis, MIG_RP_MSG_SHUT, sizeof(buf), &buf);
|
|
}
|
|
|
|
/*
|
|
* Send a 'PONG' message on the return channel with the given value
|
|
* (normally in response to a 'PING')
|
|
*/
|
|
void migrate_send_rp_pong(MigrationIncomingState *mis,
|
|
uint32_t value)
|
|
{
|
|
uint32_t buf;
|
|
|
|
buf = cpu_to_be32(value);
|
|
migrate_send_rp_message(mis, MIG_RP_MSG_PONG, sizeof(buf), &buf);
|
|
}
|
|
|
|
void migrate_send_rp_recv_bitmap(MigrationIncomingState *mis,
|
|
char *block_name)
|
|
{
|
|
char buf[512];
|
|
int len;
|
|
int64_t res;
|
|
|
|
/*
|
|
* First, we send the header part. It contains only the len of
|
|
* idstr, and the idstr itself.
|
|
*/
|
|
len = strlen(block_name);
|
|
buf[0] = len;
|
|
memcpy(buf + 1, block_name, len);
|
|
|
|
if (mis->state != MIGRATION_STATUS_POSTCOPY_RECOVER) {
|
|
error_report("%s: MSG_RP_RECV_BITMAP only used for recovery",
|
|
__func__);
|
|
return;
|
|
}
|
|
|
|
migrate_send_rp_message(mis, MIG_RP_MSG_RECV_BITMAP, len + 1, buf);
|
|
|
|
/*
|
|
* Next, we dump the received bitmap to the stream.
|
|
*
|
|
* TODO: currently we are safe since we are the only one that is
|
|
* using the to_src_file handle (fault thread is still paused),
|
|
* and it's ok even not taking the mutex. However the best way is
|
|
* to take the lock before sending the message header, and release
|
|
* the lock after sending the bitmap.
|
|
*/
|
|
qemu_mutex_lock(&mis->rp_mutex);
|
|
res = ramblock_recv_bitmap_send(mis->to_src_file, block_name);
|
|
qemu_mutex_unlock(&mis->rp_mutex);
|
|
|
|
trace_migrate_send_rp_recv_bitmap(block_name, res);
|
|
}
|
|
|
|
void migrate_send_rp_resume_ack(MigrationIncomingState *mis, uint32_t value)
|
|
{
|
|
uint32_t buf;
|
|
|
|
buf = cpu_to_be32(value);
|
|
migrate_send_rp_message(mis, MIG_RP_MSG_RESUME_ACK, sizeof(buf), &buf);
|
|
}
|
|
|
|
MigrationCapabilityStatusList *qmp_query_migrate_capabilities(Error **errp)
|
|
{
|
|
MigrationCapabilityStatusList *head = NULL;
|
|
MigrationCapabilityStatusList *caps;
|
|
MigrationState *s = migrate_get_current();
|
|
int i;
|
|
|
|
caps = NULL; /* silence compiler warning */
|
|
for (i = 0; i < MIGRATION_CAPABILITY__MAX; i++) {
|
|
#ifndef CONFIG_LIVE_BLOCK_MIGRATION
|
|
if (i == MIGRATION_CAPABILITY_BLOCK) {
|
|
continue;
|
|
}
|
|
#endif
|
|
if (head == NULL) {
|
|
head = g_malloc0(sizeof(*caps));
|
|
caps = head;
|
|
} else {
|
|
caps->next = g_malloc0(sizeof(*caps));
|
|
caps = caps->next;
|
|
}
|
|
caps->value =
|
|
g_malloc(sizeof(*caps->value));
|
|
caps->value->capability = i;
|
|
caps->value->state = s->enabled_capabilities[i];
|
|
}
|
|
|
|
return head;
|
|
}
|
|
|
|
MigrationParameters *qmp_query_migrate_parameters(Error **errp)
|
|
{
|
|
MigrationParameters *params;
|
|
MigrationState *s = migrate_get_current();
|
|
|
|
/* TODO use QAPI_CLONE() instead of duplicating it inline */
|
|
params = g_malloc0(sizeof(*params));
|
|
params->has_compress_level = true;
|
|
params->compress_level = s->parameters.compress_level;
|
|
params->has_compress_threads = true;
|
|
params->compress_threads = s->parameters.compress_threads;
|
|
params->has_compress_wait_thread = true;
|
|
params->compress_wait_thread = s->parameters.compress_wait_thread;
|
|
params->has_decompress_threads = true;
|
|
params->decompress_threads = s->parameters.decompress_threads;
|
|
params->has_cpu_throttle_initial = true;
|
|
params->cpu_throttle_initial = s->parameters.cpu_throttle_initial;
|
|
params->has_cpu_throttle_increment = true;
|
|
params->cpu_throttle_increment = s->parameters.cpu_throttle_increment;
|
|
params->has_tls_creds = true;
|
|
params->tls_creds = g_strdup(s->parameters.tls_creds);
|
|
params->has_tls_hostname = true;
|
|
params->tls_hostname = g_strdup(s->parameters.tls_hostname);
|
|
params->has_tls_authz = true;
|
|
params->tls_authz = g_strdup(s->parameters.tls_authz);
|
|
params->has_max_bandwidth = true;
|
|
params->max_bandwidth = s->parameters.max_bandwidth;
|
|
params->has_downtime_limit = true;
|
|
params->downtime_limit = s->parameters.downtime_limit;
|
|
params->has_x_checkpoint_delay = true;
|
|
params->x_checkpoint_delay = s->parameters.x_checkpoint_delay;
|
|
params->has_block_incremental = true;
|
|
params->block_incremental = s->parameters.block_incremental;
|
|
params->has_multifd_channels = true;
|
|
params->multifd_channels = s->parameters.multifd_channels;
|
|
params->has_xbzrle_cache_size = true;
|
|
params->xbzrle_cache_size = s->parameters.xbzrle_cache_size;
|
|
params->has_max_postcopy_bandwidth = true;
|
|
params->max_postcopy_bandwidth = s->parameters.max_postcopy_bandwidth;
|
|
params->has_max_cpu_throttle = true;
|
|
params->max_cpu_throttle = s->parameters.max_cpu_throttle;
|
|
params->has_announce_initial = true;
|
|
params->announce_initial = s->parameters.announce_initial;
|
|
params->has_announce_max = true;
|
|
params->announce_max = s->parameters.announce_max;
|
|
params->has_announce_rounds = true;
|
|
params->announce_rounds = s->parameters.announce_rounds;
|
|
params->has_announce_step = true;
|
|
params->announce_step = s->parameters.announce_step;
|
|
|
|
return params;
|
|
}
|
|
|
|
AnnounceParameters *migrate_announce_params(void)
|
|
{
|
|
static AnnounceParameters ap;
|
|
|
|
MigrationState *s = migrate_get_current();
|
|
|
|
ap.initial = s->parameters.announce_initial;
|
|
ap.max = s->parameters.announce_max;
|
|
ap.rounds = s->parameters.announce_rounds;
|
|
ap.step = s->parameters.announce_step;
|
|
|
|
return ≈
|
|
}
|
|
|
|
/*
|
|
* Return true if we're already in the middle of a migration
|
|
* (i.e. any of the active or setup states)
|
|
*/
|
|
bool migration_is_setup_or_active(int state)
|
|
{
|
|
switch (state) {
|
|
case MIGRATION_STATUS_ACTIVE:
|
|
case MIGRATION_STATUS_POSTCOPY_ACTIVE:
|
|
case MIGRATION_STATUS_POSTCOPY_PAUSED:
|
|
case MIGRATION_STATUS_POSTCOPY_RECOVER:
|
|
case MIGRATION_STATUS_SETUP:
|
|
case MIGRATION_STATUS_PRE_SWITCHOVER:
|
|
case MIGRATION_STATUS_DEVICE:
|
|
case MIGRATION_STATUS_WAIT_UNPLUG:
|
|
return true;
|
|
|
|
default:
|
|
return false;
|
|
|
|
}
|
|
}
|
|
|
|
static void populate_time_info(MigrationInfo *info, MigrationState *s)
|
|
{
|
|
info->has_status = true;
|
|
info->has_setup_time = true;
|
|
info->setup_time = s->setup_time;
|
|
if (s->state == MIGRATION_STATUS_COMPLETED) {
|
|
info->has_total_time = true;
|
|
info->total_time = s->total_time;
|
|
info->has_downtime = true;
|
|
info->downtime = s->downtime;
|
|
} else {
|
|
info->has_total_time = true;
|
|
info->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) -
|
|
s->start_time;
|
|
info->has_expected_downtime = true;
|
|
info->expected_downtime = s->expected_downtime;
|
|
}
|
|
}
|
|
|
|
static void populate_ram_info(MigrationInfo *info, MigrationState *s)
|
|
{
|
|
info->has_ram = true;
|
|
info->ram = g_malloc0(sizeof(*info->ram));
|
|
info->ram->transferred = ram_counters.transferred;
|
|
info->ram->total = ram_bytes_total();
|
|
info->ram->duplicate = ram_counters.duplicate;
|
|
/* legacy value. It is not used anymore */
|
|
info->ram->skipped = 0;
|
|
info->ram->normal = ram_counters.normal;
|
|
info->ram->normal_bytes = ram_counters.normal *
|
|
qemu_target_page_size();
|
|
info->ram->mbps = s->mbps;
|
|
info->ram->dirty_sync_count = ram_counters.dirty_sync_count;
|
|
info->ram->postcopy_requests = ram_counters.postcopy_requests;
|
|
info->ram->page_size = qemu_target_page_size();
|
|
info->ram->multifd_bytes = ram_counters.multifd_bytes;
|
|
info->ram->pages_per_second = s->pages_per_second;
|
|
|
|
if (migrate_use_xbzrle()) {
|
|
info->has_xbzrle_cache = true;
|
|
info->xbzrle_cache = g_malloc0(sizeof(*info->xbzrle_cache));
|
|
info->xbzrle_cache->cache_size = migrate_xbzrle_cache_size();
|
|
info->xbzrle_cache->bytes = xbzrle_counters.bytes;
|
|
info->xbzrle_cache->pages = xbzrle_counters.pages;
|
|
info->xbzrle_cache->cache_miss = xbzrle_counters.cache_miss;
|
|
info->xbzrle_cache->cache_miss_rate = xbzrle_counters.cache_miss_rate;
|
|
info->xbzrle_cache->overflow = xbzrle_counters.overflow;
|
|
}
|
|
|
|
if (migrate_use_compression()) {
|
|
info->has_compression = true;
|
|
info->compression = g_malloc0(sizeof(*info->compression));
|
|
info->compression->pages = compression_counters.pages;
|
|
info->compression->busy = compression_counters.busy;
|
|
info->compression->busy_rate = compression_counters.busy_rate;
|
|
info->compression->compressed_size =
|
|
compression_counters.compressed_size;
|
|
info->compression->compression_rate =
|
|
compression_counters.compression_rate;
|
|
}
|
|
|
|
if (cpu_throttle_active()) {
|
|
info->has_cpu_throttle_percentage = true;
|
|
info->cpu_throttle_percentage = cpu_throttle_get_percentage();
|
|
}
|
|
|
|
if (s->state != MIGRATION_STATUS_COMPLETED) {
|
|
info->ram->remaining = ram_bytes_remaining();
|
|
info->ram->dirty_pages_rate = ram_counters.dirty_pages_rate;
|
|
}
|
|
}
|
|
|
|
static void populate_disk_info(MigrationInfo *info)
|
|
{
|
|
if (blk_mig_active()) {
|
|
info->has_disk = true;
|
|
info->disk = g_malloc0(sizeof(*info->disk));
|
|
info->disk->transferred = blk_mig_bytes_transferred();
|
|
info->disk->remaining = blk_mig_bytes_remaining();
|
|
info->disk->total = blk_mig_bytes_total();
|
|
}
|
|
}
|
|
|
|
static void fill_source_migration_info(MigrationInfo *info)
|
|
{
|
|
MigrationState *s = migrate_get_current();
|
|
|
|
switch (s->state) {
|
|
case MIGRATION_STATUS_NONE:
|
|
/* no migration has happened ever */
|
|
/* do not overwrite destination migration status */
|
|
return;
|
|
break;
|
|
case MIGRATION_STATUS_SETUP:
|
|
info->has_status = true;
|
|
info->has_total_time = false;
|
|
break;
|
|
case MIGRATION_STATUS_ACTIVE:
|
|
case MIGRATION_STATUS_CANCELLING:
|
|
case MIGRATION_STATUS_POSTCOPY_ACTIVE:
|
|
case MIGRATION_STATUS_PRE_SWITCHOVER:
|
|
case MIGRATION_STATUS_DEVICE:
|
|
case MIGRATION_STATUS_POSTCOPY_PAUSED:
|
|
case MIGRATION_STATUS_POSTCOPY_RECOVER:
|
|
/* TODO add some postcopy stats */
|
|
populate_time_info(info, s);
|
|
populate_ram_info(info, s);
|
|
populate_disk_info(info);
|
|
break;
|
|
case MIGRATION_STATUS_COLO:
|
|
info->has_status = true;
|
|
/* TODO: display COLO specific information (checkpoint info etc.) */
|
|
break;
|
|
case MIGRATION_STATUS_COMPLETED:
|
|
populate_time_info(info, s);
|
|
populate_ram_info(info, s);
|
|
break;
|
|
case MIGRATION_STATUS_FAILED:
|
|
info->has_status = true;
|
|
if (s->error) {
|
|
info->has_error_desc = true;
|
|
info->error_desc = g_strdup(error_get_pretty(s->error));
|
|
}
|
|
break;
|
|
case MIGRATION_STATUS_CANCELLED:
|
|
info->has_status = true;
|
|
break;
|
|
case MIGRATION_STATUS_WAIT_UNPLUG:
|
|
info->has_status = true;
|
|
break;
|
|
}
|
|
info->status = s->state;
|
|
}
|
|
|
|
/**
|
|
* @migration_caps_check - check capability validity
|
|
*
|
|
* @cap_list: old capability list, array of bool
|
|
* @params: new capabilities to be applied soon
|
|
* @errp: set *errp if the check failed, with reason
|
|
*
|
|
* Returns true if check passed, otherwise false.
|
|
*/
|
|
static bool migrate_caps_check(bool *cap_list,
|
|
MigrationCapabilityStatusList *params,
|
|
Error **errp)
|
|
{
|
|
MigrationCapabilityStatusList *cap;
|
|
bool old_postcopy_cap;
|
|
MigrationIncomingState *mis = migration_incoming_get_current();
|
|
|
|
old_postcopy_cap = cap_list[MIGRATION_CAPABILITY_POSTCOPY_RAM];
|
|
|
|
for (cap = params; cap; cap = cap->next) {
|
|
cap_list[cap->value->capability] = cap->value->state;
|
|
}
|
|
|
|
#ifndef CONFIG_LIVE_BLOCK_MIGRATION
|
|
if (cap_list[MIGRATION_CAPABILITY_BLOCK]) {
|
|
error_setg(errp, "QEMU compiled without old-style (blk/-b, inc/-i) "
|
|
"block migration");
|
|
error_append_hint(errp, "Use drive_mirror+NBD instead.\n");
|
|
return false;
|
|
}
|
|
#endif
|
|
|
|
#ifndef CONFIG_REPLICATION
|
|
if (cap_list[MIGRATION_CAPABILITY_X_COLO]) {
|
|
error_setg(errp, "QEMU compiled without replication module"
|
|
" can't enable COLO");
|
|
error_append_hint(errp, "Please enable replication before COLO.\n");
|
|
return false;
|
|
}
|
|
#endif
|
|
|
|
if (cap_list[MIGRATION_CAPABILITY_POSTCOPY_RAM]) {
|
|
if (cap_list[MIGRATION_CAPABILITY_COMPRESS]) {
|
|
/* The decompression threads asynchronously write into RAM
|
|
* rather than use the atomic copies needed to avoid
|
|
* userfaulting. It should be possible to fix the decompression
|
|
* threads for compatibility in future.
|
|
*/
|
|
error_setg(errp, "Postcopy is not currently compatible "
|
|
"with compression");
|
|
return false;
|
|
}
|
|
|
|
/* This check is reasonably expensive, so only when it's being
|
|
* set the first time, also it's only the destination that needs
|
|
* special support.
|
|
*/
|
|
if (!old_postcopy_cap && runstate_check(RUN_STATE_INMIGRATE) &&
|
|
!postcopy_ram_supported_by_host(mis)) {
|
|
/* postcopy_ram_supported_by_host will have emitted a more
|
|
* detailed message
|
|
*/
|
|
error_setg(errp, "Postcopy is not supported");
|
|
return false;
|
|
}
|
|
|
|
if (cap_list[MIGRATION_CAPABILITY_X_IGNORE_SHARED]) {
|
|
error_setg(errp, "Postcopy is not compatible with ignore-shared");
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static void fill_destination_migration_info(MigrationInfo *info)
|
|
{
|
|
MigrationIncomingState *mis = migration_incoming_get_current();
|
|
|
|
if (mis->socket_address_list) {
|
|
info->has_socket_address = true;
|
|
info->socket_address =
|
|
QAPI_CLONE(SocketAddressList, mis->socket_address_list);
|
|
}
|
|
|
|
switch (mis->state) {
|
|
case MIGRATION_STATUS_NONE:
|
|
return;
|
|
break;
|
|
case MIGRATION_STATUS_SETUP:
|
|
case MIGRATION_STATUS_CANCELLING:
|
|
case MIGRATION_STATUS_CANCELLED:
|
|
case MIGRATION_STATUS_ACTIVE:
|
|
case MIGRATION_STATUS_POSTCOPY_ACTIVE:
|
|
case MIGRATION_STATUS_POSTCOPY_PAUSED:
|
|
case MIGRATION_STATUS_POSTCOPY_RECOVER:
|
|
case MIGRATION_STATUS_FAILED:
|
|
case MIGRATION_STATUS_COLO:
|
|
info->has_status = true;
|
|
break;
|
|
case MIGRATION_STATUS_COMPLETED:
|
|
info->has_status = true;
|
|
fill_destination_postcopy_migration_info(info);
|
|
break;
|
|
}
|
|
info->status = mis->state;
|
|
}
|
|
|
|
MigrationInfo *qmp_query_migrate(Error **errp)
|
|
{
|
|
MigrationInfo *info = g_malloc0(sizeof(*info));
|
|
|
|
fill_destination_migration_info(info);
|
|
fill_source_migration_info(info);
|
|
|
|
return info;
|
|
}
|
|
|
|
void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params,
|
|
Error **errp)
|
|
{
|
|
MigrationState *s = migrate_get_current();
|
|
MigrationCapabilityStatusList *cap;
|
|
bool cap_list[MIGRATION_CAPABILITY__MAX];
|
|
|
|
if (migration_is_setup_or_active(s->state)) {
|
|
error_setg(errp, QERR_MIGRATION_ACTIVE);
|
|
return;
|
|
}
|
|
|
|
memcpy(cap_list, s->enabled_capabilities, sizeof(cap_list));
|
|
if (!migrate_caps_check(cap_list, params, errp)) {
|
|
return;
|
|
}
|
|
|
|
for (cap = params; cap; cap = cap->next) {
|
|
s->enabled_capabilities[cap->value->capability] = cap->value->state;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Check whether the parameters are valid. Error will be put into errp
|
|
* (if provided). Return true if valid, otherwise false.
|
|
*/
|
|
static bool migrate_params_check(MigrationParameters *params, Error **errp)
|
|
{
|
|
if (params->has_compress_level &&
|
|
(params->compress_level > 9)) {
|
|
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "compress_level",
|
|
"is invalid, it should be in the range of 0 to 9");
|
|
return false;
|
|
}
|
|
|
|
if (params->has_compress_threads && (params->compress_threads < 1)) {
|
|
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
|
|
"compress_threads",
|
|
"is invalid, it should be in the range of 1 to 255");
|
|
return false;
|
|
}
|
|
|
|
if (params->has_decompress_threads && (params->decompress_threads < 1)) {
|
|
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
|
|
"decompress_threads",
|
|
"is invalid, it should be in the range of 1 to 255");
|
|
return false;
|
|
}
|
|
|
|
if (params->has_cpu_throttle_initial &&
|
|
(params->cpu_throttle_initial < 1 ||
|
|
params->cpu_throttle_initial > 99)) {
|
|
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
|
|
"cpu_throttle_initial",
|
|
"an integer in the range of 1 to 99");
|
|
return false;
|
|
}
|
|
|
|
if (params->has_cpu_throttle_increment &&
|
|
(params->cpu_throttle_increment < 1 ||
|
|
params->cpu_throttle_increment > 99)) {
|
|
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
|
|
"cpu_throttle_increment",
|
|
"an integer in the range of 1 to 99");
|
|
return false;
|
|
}
|
|
|
|
if (params->has_max_bandwidth && (params->max_bandwidth > SIZE_MAX)) {
|
|
error_setg(errp, "Parameter 'max_bandwidth' expects an integer in the"
|
|
" range of 0 to %zu bytes/second", SIZE_MAX);
|
|
return false;
|
|
}
|
|
|
|
if (params->has_downtime_limit &&
|
|
(params->downtime_limit > MAX_MIGRATE_DOWNTIME)) {
|
|
error_setg(errp, "Parameter 'downtime_limit' expects an integer in "
|
|
"the range of 0 to %d milliseconds",
|
|
MAX_MIGRATE_DOWNTIME);
|
|
return false;
|
|
}
|
|
|
|
/* x_checkpoint_delay is now always positive */
|
|
|
|
if (params->has_multifd_channels && (params->multifd_channels < 1)) {
|
|
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
|
|
"multifd_channels",
|
|
"is invalid, it should be in the range of 1 to 255");
|
|
return false;
|
|
}
|
|
|
|
if (params->has_xbzrle_cache_size &&
|
|
(params->xbzrle_cache_size < qemu_target_page_size() ||
|
|
!is_power_of_2(params->xbzrle_cache_size))) {
|
|
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
|
|
"xbzrle_cache_size",
|
|
"is invalid, it should be bigger than target page size"
|
|
" and a power of two");
|
|
return false;
|
|
}
|
|
|
|
if (params->has_max_cpu_throttle &&
|
|
(params->max_cpu_throttle < params->cpu_throttle_initial ||
|
|
params->max_cpu_throttle > 99)) {
|
|
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
|
|
"max_cpu_throttle",
|
|
"an integer in the range of cpu_throttle_initial to 99");
|
|
return false;
|
|
}
|
|
|
|
if (params->has_announce_initial &&
|
|
params->announce_initial > 100000) {
|
|
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
|
|
"announce_initial",
|
|
"is invalid, it must be less than 100000 ms");
|
|
return false;
|
|
}
|
|
if (params->has_announce_max &&
|
|
params->announce_max > 100000) {
|
|
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
|
|
"announce_max",
|
|
"is invalid, it must be less than 100000 ms");
|
|
return false;
|
|
}
|
|
if (params->has_announce_rounds &&
|
|
params->announce_rounds > 1000) {
|
|
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
|
|
"announce_rounds",
|
|
"is invalid, it must be in the range of 0 to 1000");
|
|
return false;
|
|
}
|
|
if (params->has_announce_step &&
|
|
(params->announce_step < 1 ||
|
|
params->announce_step > 10000)) {
|
|
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
|
|
"announce_step",
|
|
"is invalid, it must be in the range of 1 to 10000 ms");
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
static void migrate_params_test_apply(MigrateSetParameters *params,
|
|
MigrationParameters *dest)
|
|
{
|
|
*dest = migrate_get_current()->parameters;
|
|
|
|
/* TODO use QAPI_CLONE() instead of duplicating it inline */
|
|
|
|
if (params->has_compress_level) {
|
|
dest->compress_level = params->compress_level;
|
|
}
|
|
|
|
if (params->has_compress_threads) {
|
|
dest->compress_threads = params->compress_threads;
|
|
}
|
|
|
|
if (params->has_compress_wait_thread) {
|
|
dest->compress_wait_thread = params->compress_wait_thread;
|
|
}
|
|
|
|
if (params->has_decompress_threads) {
|
|
dest->decompress_threads = params->decompress_threads;
|
|
}
|
|
|
|
if (params->has_cpu_throttle_initial) {
|
|
dest->cpu_throttle_initial = params->cpu_throttle_initial;
|
|
}
|
|
|
|
if (params->has_cpu_throttle_increment) {
|
|
dest->cpu_throttle_increment = params->cpu_throttle_increment;
|
|
}
|
|
|
|
if (params->has_tls_creds) {
|
|
assert(params->tls_creds->type == QTYPE_QSTRING);
|
|
dest->tls_creds = g_strdup(params->tls_creds->u.s);
|
|
}
|
|
|
|
if (params->has_tls_hostname) {
|
|
assert(params->tls_hostname->type == QTYPE_QSTRING);
|
|
dest->tls_hostname = g_strdup(params->tls_hostname->u.s);
|
|
}
|
|
|
|
if (params->has_max_bandwidth) {
|
|
dest->max_bandwidth = params->max_bandwidth;
|
|
}
|
|
|
|
if (params->has_downtime_limit) {
|
|
dest->downtime_limit = params->downtime_limit;
|
|
}
|
|
|
|
if (params->has_x_checkpoint_delay) {
|
|
dest->x_checkpoint_delay = params->x_checkpoint_delay;
|
|
}
|
|
|
|
if (params->has_block_incremental) {
|
|
dest->block_incremental = params->block_incremental;
|
|
}
|
|
if (params->has_multifd_channels) {
|
|
dest->multifd_channels = params->multifd_channels;
|
|
}
|
|
if (params->has_xbzrle_cache_size) {
|
|
dest->xbzrle_cache_size = params->xbzrle_cache_size;
|
|
}
|
|
if (params->has_max_postcopy_bandwidth) {
|
|
dest->max_postcopy_bandwidth = params->max_postcopy_bandwidth;
|
|
}
|
|
if (params->has_max_cpu_throttle) {
|
|
dest->max_cpu_throttle = params->max_cpu_throttle;
|
|
}
|
|
if (params->has_announce_initial) {
|
|
dest->announce_initial = params->announce_initial;
|
|
}
|
|
if (params->has_announce_max) {
|
|
dest->announce_max = params->announce_max;
|
|
}
|
|
if (params->has_announce_rounds) {
|
|
dest->announce_rounds = params->announce_rounds;
|
|
}
|
|
if (params->has_announce_step) {
|
|
dest->announce_step = params->announce_step;
|
|
}
|
|
}
|
|
|
|
static void migrate_params_apply(MigrateSetParameters *params, Error **errp)
|
|
{
|
|
MigrationState *s = migrate_get_current();
|
|
|
|
/* TODO use QAPI_CLONE() instead of duplicating it inline */
|
|
|
|
if (params->has_compress_level) {
|
|
s->parameters.compress_level = params->compress_level;
|
|
}
|
|
|
|
if (params->has_compress_threads) {
|
|
s->parameters.compress_threads = params->compress_threads;
|
|
}
|
|
|
|
if (params->has_compress_wait_thread) {
|
|
s->parameters.compress_wait_thread = params->compress_wait_thread;
|
|
}
|
|
|
|
if (params->has_decompress_threads) {
|
|
s->parameters.decompress_threads = params->decompress_threads;
|
|
}
|
|
|
|
if (params->has_cpu_throttle_initial) {
|
|
s->parameters.cpu_throttle_initial = params->cpu_throttle_initial;
|
|
}
|
|
|
|
if (params->has_cpu_throttle_increment) {
|
|
s->parameters.cpu_throttle_increment = params->cpu_throttle_increment;
|
|
}
|
|
|
|
if (params->has_tls_creds) {
|
|
g_free(s->parameters.tls_creds);
|
|
assert(params->tls_creds->type == QTYPE_QSTRING);
|
|
s->parameters.tls_creds = g_strdup(params->tls_creds->u.s);
|
|
}
|
|
|
|
if (params->has_tls_hostname) {
|
|
g_free(s->parameters.tls_hostname);
|
|
assert(params->tls_hostname->type == QTYPE_QSTRING);
|
|
s->parameters.tls_hostname = g_strdup(params->tls_hostname->u.s);
|
|
}
|
|
|
|
if (params->has_tls_authz) {
|
|
g_free(s->parameters.tls_authz);
|
|
assert(params->tls_authz->type == QTYPE_QSTRING);
|
|
s->parameters.tls_authz = g_strdup(params->tls_authz->u.s);
|
|
}
|
|
|
|
if (params->has_max_bandwidth) {
|
|
s->parameters.max_bandwidth = params->max_bandwidth;
|
|
if (s->to_dst_file && !migration_in_postcopy()) {
|
|
qemu_file_set_rate_limit(s->to_dst_file,
|
|
s->parameters.max_bandwidth / XFER_LIMIT_RATIO);
|
|
}
|
|
}
|
|
|
|
if (params->has_downtime_limit) {
|
|
s->parameters.downtime_limit = params->downtime_limit;
|
|
}
|
|
|
|
if (params->has_x_checkpoint_delay) {
|
|
s->parameters.x_checkpoint_delay = params->x_checkpoint_delay;
|
|
if (migration_in_colo_state()) {
|
|
colo_checkpoint_notify(s);
|
|
}
|
|
}
|
|
|
|
if (params->has_block_incremental) {
|
|
s->parameters.block_incremental = params->block_incremental;
|
|
}
|
|
if (params->has_multifd_channels) {
|
|
s->parameters.multifd_channels = params->multifd_channels;
|
|
}
|
|
if (params->has_xbzrle_cache_size) {
|
|
s->parameters.xbzrle_cache_size = params->xbzrle_cache_size;
|
|
xbzrle_cache_resize(params->xbzrle_cache_size, errp);
|
|
}
|
|
if (params->has_max_postcopy_bandwidth) {
|
|
s->parameters.max_postcopy_bandwidth = params->max_postcopy_bandwidth;
|
|
if (s->to_dst_file && migration_in_postcopy()) {
|
|
qemu_file_set_rate_limit(s->to_dst_file,
|
|
s->parameters.max_postcopy_bandwidth / XFER_LIMIT_RATIO);
|
|
}
|
|
}
|
|
if (params->has_max_cpu_throttle) {
|
|
s->parameters.max_cpu_throttle = params->max_cpu_throttle;
|
|
}
|
|
if (params->has_announce_initial) {
|
|
s->parameters.announce_initial = params->announce_initial;
|
|
}
|
|
if (params->has_announce_max) {
|
|
s->parameters.announce_max = params->announce_max;
|
|
}
|
|
if (params->has_announce_rounds) {
|
|
s->parameters.announce_rounds = params->announce_rounds;
|
|
}
|
|
if (params->has_announce_step) {
|
|
s->parameters.announce_step = params->announce_step;
|
|
}
|
|
}
|
|
|
|
void qmp_migrate_set_parameters(MigrateSetParameters *params, Error **errp)
|
|
{
|
|
MigrationParameters tmp;
|
|
|
|
/* TODO Rewrite "" to null instead */
|
|
if (params->has_tls_creds
|
|
&& params->tls_creds->type == QTYPE_QNULL) {
|
|
qobject_unref(params->tls_creds->u.n);
|
|
params->tls_creds->type = QTYPE_QSTRING;
|
|
params->tls_creds->u.s = strdup("");
|
|
}
|
|
/* TODO Rewrite "" to null instead */
|
|
if (params->has_tls_hostname
|
|
&& params->tls_hostname->type == QTYPE_QNULL) {
|
|
qobject_unref(params->tls_hostname->u.n);
|
|
params->tls_hostname->type = QTYPE_QSTRING;
|
|
params->tls_hostname->u.s = strdup("");
|
|
}
|
|
|
|
migrate_params_test_apply(params, &tmp);
|
|
|
|
if (!migrate_params_check(&tmp, errp)) {
|
|
/* Invalid parameter */
|
|
return;
|
|
}
|
|
|
|
migrate_params_apply(params, errp);
|
|
}
|
|
|
|
|
|
void qmp_migrate_start_postcopy(Error **errp)
|
|
{
|
|
MigrationState *s = migrate_get_current();
|
|
|
|
if (!migrate_postcopy()) {
|
|
error_setg(errp, "Enable postcopy with migrate_set_capability before"
|
|
" the start of migration");
|
|
return;
|
|
}
|
|
|
|
if (s->state == MIGRATION_STATUS_NONE) {
|
|
error_setg(errp, "Postcopy must be started after migration has been"
|
|
" started");
|
|
return;
|
|
}
|
|
/*
|
|
* we don't error if migration has finished since that would be racy
|
|
* with issuing this command.
|
|
*/
|
|
atomic_set(&s->start_postcopy, true);
|
|
}
|
|
|
|
/* shared migration helpers */
|
|
|
|
void migrate_set_state(int *state, int old_state, int new_state)
|
|
{
|
|
assert(new_state < MIGRATION_STATUS__MAX);
|
|
if (atomic_cmpxchg(state, old_state, new_state) == old_state) {
|
|
trace_migrate_set_state(MigrationStatus_str(new_state));
|
|
migrate_generate_event(new_state);
|
|
}
|
|
}
|
|
|
|
static MigrationCapabilityStatusList *migrate_cap_add(
|
|
MigrationCapabilityStatusList *list,
|
|
MigrationCapability index,
|
|
bool state)
|
|
{
|
|
MigrationCapabilityStatusList *cap;
|
|
|
|
cap = g_new0(MigrationCapabilityStatusList, 1);
|
|
cap->value = g_new0(MigrationCapabilityStatus, 1);
|
|
cap->value->capability = index;
|
|
cap->value->state = state;
|
|
cap->next = list;
|
|
|
|
return cap;
|
|
}
|
|
|
|
void migrate_set_block_enabled(bool value, Error **errp)
|
|
{
|
|
MigrationCapabilityStatusList *cap;
|
|
|
|
cap = migrate_cap_add(NULL, MIGRATION_CAPABILITY_BLOCK, value);
|
|
qmp_migrate_set_capabilities(cap, errp);
|
|
qapi_free_MigrationCapabilityStatusList(cap);
|
|
}
|
|
|
|
static void migrate_set_block_incremental(MigrationState *s, bool value)
|
|
{
|
|
s->parameters.block_incremental = value;
|
|
}
|
|
|
|
static void block_cleanup_parameters(MigrationState *s)
|
|
{
|
|
if (s->must_remove_block_options) {
|
|
/* setting to false can never fail */
|
|
migrate_set_block_enabled(false, &error_abort);
|
|
migrate_set_block_incremental(s, false);
|
|
s->must_remove_block_options = false;
|
|
}
|
|
}
|
|
|
|
static void migrate_fd_cleanup(MigrationState *s)
|
|
{
|
|
qemu_bh_delete(s->cleanup_bh);
|
|
s->cleanup_bh = NULL;
|
|
|
|
qemu_savevm_state_cleanup();
|
|
|
|
if (s->to_dst_file) {
|
|
QEMUFile *tmp;
|
|
|
|
trace_migrate_fd_cleanup();
|
|
qemu_mutex_unlock_iothread();
|
|
if (s->migration_thread_running) {
|
|
qemu_thread_join(&s->thread);
|
|
s->migration_thread_running = false;
|
|
}
|
|
qemu_mutex_lock_iothread();
|
|
|
|
multifd_save_cleanup();
|
|
qemu_mutex_lock(&s->qemu_file_lock);
|
|
tmp = s->to_dst_file;
|
|
s->to_dst_file = NULL;
|
|
qemu_mutex_unlock(&s->qemu_file_lock);
|
|
/*
|
|
* Close the file handle without the lock to make sure the
|
|
* critical section won't block for long.
|
|
*/
|
|
qemu_fclose(tmp);
|
|
}
|
|
|
|
assert(!migration_is_active(s));
|
|
|
|
if (s->state == MIGRATION_STATUS_CANCELLING) {
|
|
migrate_set_state(&s->state, MIGRATION_STATUS_CANCELLING,
|
|
MIGRATION_STATUS_CANCELLED);
|
|
}
|
|
|
|
if (s->error) {
|
|
/* It is used on info migrate. We can't free it */
|
|
error_report_err(error_copy(s->error));
|
|
}
|
|
notifier_list_notify(&migration_state_notifiers, s);
|
|
block_cleanup_parameters(s);
|
|
}
|
|
|
|
static void migrate_fd_cleanup_schedule(MigrationState *s)
|
|
{
|
|
/*
|
|
* Ref the state for bh, because it may be called when
|
|
* there're already no other refs
|
|
*/
|
|
object_ref(OBJECT(s));
|
|
qemu_bh_schedule(s->cleanup_bh);
|
|
}
|
|
|
|
static void migrate_fd_cleanup_bh(void *opaque)
|
|
{
|
|
MigrationState *s = opaque;
|
|
migrate_fd_cleanup(s);
|
|
object_unref(OBJECT(s));
|
|
}
|
|
|
|
void migrate_set_error(MigrationState *s, const Error *error)
|
|
{
|
|
qemu_mutex_lock(&s->error_mutex);
|
|
if (!s->error) {
|
|
s->error = error_copy(error);
|
|
}
|
|
qemu_mutex_unlock(&s->error_mutex);
|
|
}
|
|
|
|
void migrate_fd_error(MigrationState *s, const Error *error)
|
|
{
|
|
trace_migrate_fd_error(error_get_pretty(error));
|
|
assert(s->to_dst_file == NULL);
|
|
migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
|
|
MIGRATION_STATUS_FAILED);
|
|
migrate_set_error(s, error);
|
|
}
|
|
|
|
static void migrate_fd_cancel(MigrationState *s)
|
|
{
|
|
int old_state ;
|
|
QEMUFile *f = migrate_get_current()->to_dst_file;
|
|
trace_migrate_fd_cancel();
|
|
|
|
if (s->rp_state.from_dst_file) {
|
|
/* shutdown the rp socket, so causing the rp thread to shutdown */
|
|
qemu_file_shutdown(s->rp_state.from_dst_file);
|
|
}
|
|
|
|
do {
|
|
old_state = s->state;
|
|
if (!migration_is_setup_or_active(old_state)) {
|
|
break;
|
|
}
|
|
/* If the migration is paused, kick it out of the pause */
|
|
if (old_state == MIGRATION_STATUS_PRE_SWITCHOVER) {
|
|
qemu_sem_post(&s->pause_sem);
|
|
}
|
|
migrate_set_state(&s->state, old_state, MIGRATION_STATUS_CANCELLING);
|
|
} while (s->state != MIGRATION_STATUS_CANCELLING);
|
|
|
|
/*
|
|
* If we're unlucky the migration code might be stuck somewhere in a
|
|
* send/write while the network has failed and is waiting to timeout;
|
|
* if we've got shutdown(2) available then we can force it to quit.
|
|
* The outgoing qemu file gets closed in migrate_fd_cleanup that is
|
|
* called in a bh, so there is no race against this cancel.
|
|
*/
|
|
if (s->state == MIGRATION_STATUS_CANCELLING && f) {
|
|
qemu_file_shutdown(f);
|
|
}
|
|
if (s->state == MIGRATION_STATUS_CANCELLING && s->block_inactive) {
|
|
Error *local_err = NULL;
|
|
|
|
bdrv_invalidate_cache_all(&local_err);
|
|
if (local_err) {
|
|
error_report_err(local_err);
|
|
} else {
|
|
s->block_inactive = false;
|
|
}
|
|
}
|
|
}
|
|
|
|
void add_migration_state_change_notifier(Notifier *notify)
|
|
{
|
|
notifier_list_add(&migration_state_notifiers, notify);
|
|
}
|
|
|
|
void remove_migration_state_change_notifier(Notifier *notify)
|
|
{
|
|
notifier_remove(notify);
|
|
}
|
|
|
|
bool migration_in_setup(MigrationState *s)
|
|
{
|
|
return s->state == MIGRATION_STATUS_SETUP;
|
|
}
|
|
|
|
bool migration_has_finished(MigrationState *s)
|
|
{
|
|
return s->state == MIGRATION_STATUS_COMPLETED;
|
|
}
|
|
|
|
bool migration_has_failed(MigrationState *s)
|
|
{
|
|
return (s->state == MIGRATION_STATUS_CANCELLED ||
|
|
s->state == MIGRATION_STATUS_FAILED);
|
|
}
|
|
|
|
bool migration_in_postcopy(void)
|
|
{
|
|
MigrationState *s = migrate_get_current();
|
|
|
|
switch (s->state) {
|
|
case MIGRATION_STATUS_POSTCOPY_ACTIVE:
|
|
case MIGRATION_STATUS_POSTCOPY_PAUSED:
|
|
case MIGRATION_STATUS_POSTCOPY_RECOVER:
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
bool migration_in_postcopy_after_devices(MigrationState *s)
|
|
{
|
|
return migration_in_postcopy() && s->postcopy_after_devices;
|
|
}
|
|
|
|
bool migration_is_idle(void)
|
|
{
|
|
MigrationState *s = current_migration;
|
|
|
|
if (!s) {
|
|
return true;
|
|
}
|
|
|
|
switch (s->state) {
|
|
case MIGRATION_STATUS_NONE:
|
|
case MIGRATION_STATUS_CANCELLED:
|
|
case MIGRATION_STATUS_COMPLETED:
|
|
case MIGRATION_STATUS_FAILED:
|
|
return true;
|
|
case MIGRATION_STATUS_SETUP:
|
|
case MIGRATION_STATUS_CANCELLING:
|
|
case MIGRATION_STATUS_ACTIVE:
|
|
case MIGRATION_STATUS_POSTCOPY_ACTIVE:
|
|
case MIGRATION_STATUS_COLO:
|
|
case MIGRATION_STATUS_PRE_SWITCHOVER:
|
|
case MIGRATION_STATUS_DEVICE:
|
|
case MIGRATION_STATUS_WAIT_UNPLUG:
|
|
return false;
|
|
case MIGRATION_STATUS__MAX:
|
|
g_assert_not_reached();
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
bool migration_is_active(MigrationState *s)
|
|
{
|
|
return (s->state == MIGRATION_STATUS_ACTIVE ||
|
|
s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE);
|
|
}
|
|
|
|
void migrate_init(MigrationState *s)
|
|
{
|
|
/*
|
|
* Reinitialise all migration state, except
|
|
* parameters/capabilities that the user set, and
|
|
* locks.
|
|
*/
|
|
s->cleanup_bh = 0;
|
|
s->to_dst_file = NULL;
|
|
s->state = MIGRATION_STATUS_NONE;
|
|
s->rp_state.from_dst_file = NULL;
|
|
s->rp_state.error = false;
|
|
s->mbps = 0.0;
|
|
s->pages_per_second = 0.0;
|
|
s->downtime = 0;
|
|
s->expected_downtime = 0;
|
|
s->setup_time = 0;
|
|
s->start_postcopy = false;
|
|
s->postcopy_after_devices = false;
|
|
s->migration_thread_running = false;
|
|
error_free(s->error);
|
|
s->error = NULL;
|
|
|
|
migrate_set_state(&s->state, MIGRATION_STATUS_NONE, MIGRATION_STATUS_SETUP);
|
|
|
|
s->start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
|
|
s->total_time = 0;
|
|
s->vm_was_running = false;
|
|
s->iteration_initial_bytes = 0;
|
|
s->threshold_size = 0;
|
|
}
|
|
|
|
static GSList *migration_blockers;
|
|
|
|
int migrate_add_blocker(Error *reason, Error **errp)
|
|
{
|
|
if (only_migratable) {
|
|
error_propagate_prepend(errp, error_copy(reason),
|
|
"disallowing migration blocker "
|
|
"(--only-migratable) for: ");
|
|
return -EACCES;
|
|
}
|
|
|
|
if (migration_is_idle()) {
|
|
migration_blockers = g_slist_prepend(migration_blockers, reason);
|
|
return 0;
|
|
}
|
|
|
|
error_propagate_prepend(errp, error_copy(reason),
|
|
"disallowing migration blocker "
|
|
"(migration in progress) for: ");
|
|
return -EBUSY;
|
|
}
|
|
|
|
void migrate_del_blocker(Error *reason)
|
|
{
|
|
migration_blockers = g_slist_remove(migration_blockers, reason);
|
|
}
|
|
|
|
void qmp_migrate_incoming(const char *uri, Error **errp)
|
|
{
|
|
Error *local_err = NULL;
|
|
static bool once = true;
|
|
|
|
if (!deferred_incoming) {
|
|
error_setg(errp, "For use with '-incoming defer'");
|
|
return;
|
|
}
|
|
if (!once) {
|
|
error_setg(errp, "The incoming migration has already been started");
|
|
}
|
|
|
|
qemu_start_incoming_migration(uri, &local_err);
|
|
|
|
if (local_err) {
|
|
error_propagate(errp, local_err);
|
|
return;
|
|
}
|
|
|
|
once = false;
|
|
}
|
|
|
|
void qmp_migrate_recover(const char *uri, Error **errp)
|
|
{
|
|
MigrationIncomingState *mis = migration_incoming_get_current();
|
|
|
|
if (mis->state != MIGRATION_STATUS_POSTCOPY_PAUSED) {
|
|
error_setg(errp, "Migrate recover can only be run "
|
|
"when postcopy is paused.");
|
|
return;
|
|
}
|
|
|
|
if (atomic_cmpxchg(&mis->postcopy_recover_triggered,
|
|
false, true) == true) {
|
|
error_setg(errp, "Migrate recovery is triggered already");
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Note that this call will never start a real migration; it will
|
|
* only re-setup the migration stream and poke existing migration
|
|
* to continue using that newly established channel.
|
|
*/
|
|
qemu_start_incoming_migration(uri, errp);
|
|
}
|
|
|
|
void qmp_migrate_pause(Error **errp)
|
|
{
|
|
MigrationState *ms = migrate_get_current();
|
|
MigrationIncomingState *mis = migration_incoming_get_current();
|
|
int ret;
|
|
|
|
if (ms->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) {
|
|
/* Source side, during postcopy */
|
|
qemu_mutex_lock(&ms->qemu_file_lock);
|
|
ret = qemu_file_shutdown(ms->to_dst_file);
|
|
qemu_mutex_unlock(&ms->qemu_file_lock);
|
|
if (ret) {
|
|
error_setg(errp, "Failed to pause source migration");
|
|
}
|
|
return;
|
|
}
|
|
|
|
if (mis->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) {
|
|
ret = qemu_file_shutdown(mis->from_src_file);
|
|
if (ret) {
|
|
error_setg(errp, "Failed to pause destination migration");
|
|
}
|
|
return;
|
|
}
|
|
|
|
error_setg(errp, "migrate-pause is currently only supported "
|
|
"during postcopy-active state");
|
|
}
|
|
|
|
bool migration_is_blocked(Error **errp)
|
|
{
|
|
if (qemu_savevm_state_blocked(errp)) {
|
|
return true;
|
|
}
|
|
|
|
if (migration_blockers) {
|
|
error_propagate(errp, error_copy(migration_blockers->data));
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/* Returns true if continue to migrate, or false if error detected */
|
|
static bool migrate_prepare(MigrationState *s, bool blk, bool blk_inc,
|
|
bool resume, Error **errp)
|
|
{
|
|
Error *local_err = NULL;
|
|
|
|
if (resume) {
|
|
if (s->state != MIGRATION_STATUS_POSTCOPY_PAUSED) {
|
|
error_setg(errp, "Cannot resume if there is no "
|
|
"paused migration");
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Postcopy recovery won't work well with release-ram
|
|
* capability since release-ram will drop the page buffer as
|
|
* long as the page is put into the send buffer. So if there
|
|
* is a network failure happened, any page buffers that have
|
|
* not yet reached the destination VM but have already been
|
|
* sent from the source VM will be lost forever. Let's refuse
|
|
* the client from resuming such a postcopy migration.
|
|
* Luckily release-ram was designed to only be used when src
|
|
* and destination VMs are on the same host, so it should be
|
|
* fine.
|
|
*/
|
|
if (migrate_release_ram()) {
|
|
error_setg(errp, "Postcopy recovery cannot work "
|
|
"when release-ram capability is set");
|
|
return false;
|
|
}
|
|
|
|
/* This is a resume, skip init status */
|
|
return true;
|
|
}
|
|
|
|
if (migration_is_setup_or_active(s->state) ||
|
|
s->state == MIGRATION_STATUS_CANCELLING ||
|
|
s->state == MIGRATION_STATUS_COLO) {
|
|
error_setg(errp, QERR_MIGRATION_ACTIVE);
|
|
return false;
|
|
}
|
|
|
|
if (runstate_check(RUN_STATE_INMIGRATE)) {
|
|
error_setg(errp, "Guest is waiting for an incoming migration");
|
|
return false;
|
|
}
|
|
|
|
if (migration_is_blocked(errp)) {
|
|
return false;
|
|
}
|
|
|
|
if (blk || blk_inc) {
|
|
if (migrate_use_block() || migrate_use_block_incremental()) {
|
|
error_setg(errp, "Command options are incompatible with "
|
|
"current migration capabilities");
|
|
return false;
|
|
}
|
|
migrate_set_block_enabled(true, &local_err);
|
|
if (local_err) {
|
|
error_propagate(errp, local_err);
|
|
return false;
|
|
}
|
|
s->must_remove_block_options = true;
|
|
}
|
|
|
|
if (blk_inc) {
|
|
migrate_set_block_incremental(s, true);
|
|
}
|
|
|
|
migrate_init(s);
|
|
/*
|
|
* set ram_counters memory to zero for a
|
|
* new migration
|
|
*/
|
|
memset(&ram_counters, 0, sizeof(ram_counters));
|
|
|
|
return true;
|
|
}
|
|
|
|
void qmp_migrate(const char *uri, bool has_blk, bool blk,
|
|
bool has_inc, bool inc, bool has_detach, bool detach,
|
|
bool has_resume, bool resume, Error **errp)
|
|
{
|
|
Error *local_err = NULL;
|
|
MigrationState *s = migrate_get_current();
|
|
const char *p;
|
|
|
|
if (!migrate_prepare(s, has_blk && blk, has_inc && inc,
|
|
has_resume && resume, errp)) {
|
|
/* Error detected, put into errp */
|
|
return;
|
|
}
|
|
|
|
if (strstart(uri, "tcp:", &p)) {
|
|
tcp_start_outgoing_migration(s, p, &local_err);
|
|
#ifdef CONFIG_RDMA
|
|
} else if (strstart(uri, "rdma:", &p)) {
|
|
rdma_start_outgoing_migration(s, p, &local_err);
|
|
#endif
|
|
} else if (strstart(uri, "exec:", &p)) {
|
|
exec_start_outgoing_migration(s, p, &local_err);
|
|
} else if (strstart(uri, "unix:", &p)) {
|
|
unix_start_outgoing_migration(s, p, &local_err);
|
|
} else if (strstart(uri, "fd:", &p)) {
|
|
fd_start_outgoing_migration(s, p, &local_err);
|
|
} else {
|
|
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "uri",
|
|
"a valid migration protocol");
|
|
migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
|
|
MIGRATION_STATUS_FAILED);
|
|
block_cleanup_parameters(s);
|
|
return;
|
|
}
|
|
|
|
if (local_err) {
|
|
migrate_fd_error(s, local_err);
|
|
error_propagate(errp, local_err);
|
|
return;
|
|
}
|
|
}
|
|
|
|
void qmp_migrate_cancel(Error **errp)
|
|
{
|
|
migrate_fd_cancel(migrate_get_current());
|
|
}
|
|
|
|
void qmp_migrate_continue(MigrationStatus state, Error **errp)
|
|
{
|
|
MigrationState *s = migrate_get_current();
|
|
if (s->state != state) {
|
|
error_setg(errp, "Migration not in expected state: %s",
|
|
MigrationStatus_str(s->state));
|
|
return;
|
|
}
|
|
qemu_sem_post(&s->pause_sem);
|
|
}
|
|
|
|
void qmp_migrate_set_cache_size(int64_t value, Error **errp)
|
|
{
|
|
MigrateSetParameters p = {
|
|
.has_xbzrle_cache_size = true,
|
|
.xbzrle_cache_size = value,
|
|
};
|
|
|
|
qmp_migrate_set_parameters(&p, errp);
|
|
}
|
|
|
|
int64_t qmp_query_migrate_cache_size(Error **errp)
|
|
{
|
|
return migrate_xbzrle_cache_size();
|
|
}
|
|
|
|
void qmp_migrate_set_speed(int64_t value, Error **errp)
|
|
{
|
|
MigrateSetParameters p = {
|
|
.has_max_bandwidth = true,
|
|
.max_bandwidth = value,
|
|
};
|
|
|
|
qmp_migrate_set_parameters(&p, errp);
|
|
}
|
|
|
|
void qmp_migrate_set_downtime(double value, Error **errp)
|
|
{
|
|
if (value < 0 || value > MAX_MIGRATE_DOWNTIME_SECONDS) {
|
|
error_setg(errp, "Parameter 'downtime_limit' expects an integer in "
|
|
"the range of 0 to %d seconds",
|
|
MAX_MIGRATE_DOWNTIME_SECONDS);
|
|
return;
|
|
}
|
|
|
|
value *= 1000; /* Convert to milliseconds */
|
|
value = MAX(0, MIN(INT64_MAX, value));
|
|
|
|
MigrateSetParameters p = {
|
|
.has_downtime_limit = true,
|
|
.downtime_limit = value,
|
|
};
|
|
|
|
qmp_migrate_set_parameters(&p, errp);
|
|
}
|
|
|
|
bool migrate_release_ram(void)
|
|
{
|
|
MigrationState *s;
|
|
|
|
s = migrate_get_current();
|
|
|
|
return s->enabled_capabilities[MIGRATION_CAPABILITY_RELEASE_RAM];
|
|
}
|
|
|
|
bool migrate_postcopy_ram(void)
|
|
{
|
|
MigrationState *s;
|
|
|
|
s = migrate_get_current();
|
|
|
|
return s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_RAM];
|
|
}
|
|
|
|
bool migrate_postcopy(void)
|
|
{
|
|
return migrate_postcopy_ram() || migrate_dirty_bitmaps();
|
|
}
|
|
|
|
bool migrate_auto_converge(void)
|
|
{
|
|
MigrationState *s;
|
|
|
|
s = migrate_get_current();
|
|
|
|
return s->enabled_capabilities[MIGRATION_CAPABILITY_AUTO_CONVERGE];
|
|
}
|
|
|
|
bool migrate_zero_blocks(void)
|
|
{
|
|
MigrationState *s;
|
|
|
|
s = migrate_get_current();
|
|
|
|
return s->enabled_capabilities[MIGRATION_CAPABILITY_ZERO_BLOCKS];
|
|
}
|
|
|
|
bool migrate_postcopy_blocktime(void)
|
|
{
|
|
MigrationState *s;
|
|
|
|
s = migrate_get_current();
|
|
|
|
return s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_BLOCKTIME];
|
|
}
|
|
|
|
bool migrate_use_compression(void)
|
|
{
|
|
MigrationState *s;
|
|
|
|
s = migrate_get_current();
|
|
|
|
return s->enabled_capabilities[MIGRATION_CAPABILITY_COMPRESS];
|
|
}
|
|
|
|
int migrate_compress_level(void)
|
|
{
|
|
MigrationState *s;
|
|
|
|
s = migrate_get_current();
|
|
|
|
return s->parameters.compress_level;
|
|
}
|
|
|
|
int migrate_compress_threads(void)
|
|
{
|
|
MigrationState *s;
|
|
|
|
s = migrate_get_current();
|
|
|
|
return s->parameters.compress_threads;
|
|
}
|
|
|
|
int migrate_compress_wait_thread(void)
|
|
{
|
|
MigrationState *s;
|
|
|
|
s = migrate_get_current();
|
|
|
|
return s->parameters.compress_wait_thread;
|
|
}
|
|
|
|
int migrate_decompress_threads(void)
|
|
{
|
|
MigrationState *s;
|
|
|
|
s = migrate_get_current();
|
|
|
|
return s->parameters.decompress_threads;
|
|
}
|
|
|
|
bool migrate_dirty_bitmaps(void)
|
|
{
|
|
MigrationState *s;
|
|
|
|
s = migrate_get_current();
|
|
|
|
return s->enabled_capabilities[MIGRATION_CAPABILITY_DIRTY_BITMAPS];
|
|
}
|
|
|
|
bool migrate_ignore_shared(void)
|
|
{
|
|
MigrationState *s;
|
|
|
|
s = migrate_get_current();
|
|
|
|
return s->enabled_capabilities[MIGRATION_CAPABILITY_X_IGNORE_SHARED];
|
|
}
|
|
|
|
bool migrate_validate_uuid(void)
|
|
{
|
|
MigrationState *s;
|
|
|
|
s = migrate_get_current();
|
|
|
|
return s->enabled_capabilities[MIGRATION_CAPABILITY_VALIDATE_UUID];
|
|
}
|
|
|
|
bool migrate_use_events(void)
|
|
{
|
|
MigrationState *s;
|
|
|
|
s = migrate_get_current();
|
|
|
|
return s->enabled_capabilities[MIGRATION_CAPABILITY_EVENTS];
|
|
}
|
|
|
|
bool migrate_use_multifd(void)
|
|
{
|
|
MigrationState *s;
|
|
|
|
s = migrate_get_current();
|
|
|
|
return s->enabled_capabilities[MIGRATION_CAPABILITY_MULTIFD];
|
|
}
|
|
|
|
bool migrate_pause_before_switchover(void)
|
|
{
|
|
MigrationState *s;
|
|
|
|
s = migrate_get_current();
|
|
|
|
return s->enabled_capabilities[
|
|
MIGRATION_CAPABILITY_PAUSE_BEFORE_SWITCHOVER];
|
|
}
|
|
|
|
int migrate_multifd_channels(void)
|
|
{
|
|
MigrationState *s;
|
|
|
|
s = migrate_get_current();
|
|
|
|
return s->parameters.multifd_channels;
|
|
}
|
|
|
|
int migrate_use_xbzrle(void)
|
|
{
|
|
MigrationState *s;
|
|
|
|
s = migrate_get_current();
|
|
|
|
return s->enabled_capabilities[MIGRATION_CAPABILITY_XBZRLE];
|
|
}
|
|
|
|
int64_t migrate_xbzrle_cache_size(void)
|
|
{
|
|
MigrationState *s;
|
|
|
|
s = migrate_get_current();
|
|
|
|
return s->parameters.xbzrle_cache_size;
|
|
}
|
|
|
|
static int64_t migrate_max_postcopy_bandwidth(void)
|
|
{
|
|
MigrationState *s;
|
|
|
|
s = migrate_get_current();
|
|
|
|
return s->parameters.max_postcopy_bandwidth;
|
|
}
|
|
|
|
bool migrate_use_block(void)
|
|
{
|
|
MigrationState *s;
|
|
|
|
s = migrate_get_current();
|
|
|
|
return s->enabled_capabilities[MIGRATION_CAPABILITY_BLOCK];
|
|
}
|
|
|
|
bool migrate_use_return_path(void)
|
|
{
|
|
MigrationState *s;
|
|
|
|
s = migrate_get_current();
|
|
|
|
return s->enabled_capabilities[MIGRATION_CAPABILITY_RETURN_PATH];
|
|
}
|
|
|
|
bool migrate_use_block_incremental(void)
|
|
{
|
|
MigrationState *s;
|
|
|
|
s = migrate_get_current();
|
|
|
|
return s->parameters.block_incremental;
|
|
}
|
|
|
|
/* migration thread support */
|
|
/*
|
|
* Something bad happened to the RP stream, mark an error
|
|
* The caller shall print or trace something to indicate why
|
|
*/
|
|
static void mark_source_rp_bad(MigrationState *s)
|
|
{
|
|
s->rp_state.error = true;
|
|
}
|
|
|
|
static struct rp_cmd_args {
|
|
ssize_t len; /* -1 = variable */
|
|
const char *name;
|
|
} rp_cmd_args[] = {
|
|
[MIG_RP_MSG_INVALID] = { .len = -1, .name = "INVALID" },
|
|
[MIG_RP_MSG_SHUT] = { .len = 4, .name = "SHUT" },
|
|
[MIG_RP_MSG_PONG] = { .len = 4, .name = "PONG" },
|
|
[MIG_RP_MSG_REQ_PAGES] = { .len = 12, .name = "REQ_PAGES" },
|
|
[MIG_RP_MSG_REQ_PAGES_ID] = { .len = -1, .name = "REQ_PAGES_ID" },
|
|
[MIG_RP_MSG_RECV_BITMAP] = { .len = -1, .name = "RECV_BITMAP" },
|
|
[MIG_RP_MSG_RESUME_ACK] = { .len = 4, .name = "RESUME_ACK" },
|
|
[MIG_RP_MSG_MAX] = { .len = -1, .name = "MAX" },
|
|
};
|
|
|
|
/*
|
|
* Process a request for pages received on the return path,
|
|
* We're allowed to send more than requested (e.g. to round to our page size)
|
|
* and we don't need to send pages that have already been sent.
|
|
*/
|
|
static void migrate_handle_rp_req_pages(MigrationState *ms, const char* rbname,
|
|
ram_addr_t start, size_t len)
|
|
{
|
|
long our_host_ps = qemu_real_host_page_size;
|
|
|
|
trace_migrate_handle_rp_req_pages(rbname, start, len);
|
|
|
|
/*
|
|
* Since we currently insist on matching page sizes, just sanity check
|
|
* we're being asked for whole host pages.
|
|
*/
|
|
if (start & (our_host_ps-1) ||
|
|
(len & (our_host_ps-1))) {
|
|
error_report("%s: Misaligned page request, start: " RAM_ADDR_FMT
|
|
" len: %zd", __func__, start, len);
|
|
mark_source_rp_bad(ms);
|
|
return;
|
|
}
|
|
|
|
if (ram_save_queue_pages(rbname, start, len)) {
|
|
mark_source_rp_bad(ms);
|
|
}
|
|
}
|
|
|
|
/* Return true to retry, false to quit */
|
|
static bool postcopy_pause_return_path_thread(MigrationState *s)
|
|
{
|
|
trace_postcopy_pause_return_path();
|
|
|
|
qemu_sem_wait(&s->postcopy_pause_rp_sem);
|
|
|
|
trace_postcopy_pause_return_path_continued();
|
|
|
|
return true;
|
|
}
|
|
|
|
static int migrate_handle_rp_recv_bitmap(MigrationState *s, char *block_name)
|
|
{
|
|
RAMBlock *block = qemu_ram_block_by_name(block_name);
|
|
|
|
if (!block) {
|
|
error_report("%s: invalid block name '%s'", __func__, block_name);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Fetch the received bitmap and refresh the dirty bitmap */
|
|
return ram_dirty_bitmap_reload(s, block);
|
|
}
|
|
|
|
static int migrate_handle_rp_resume_ack(MigrationState *s, uint32_t value)
|
|
{
|
|
trace_source_return_path_thread_resume_ack(value);
|
|
|
|
if (value != MIGRATION_RESUME_ACK_VALUE) {
|
|
error_report("%s: illegal resume_ack value %"PRIu32,
|
|
__func__, value);
|
|
return -1;
|
|
}
|
|
|
|
/* Now both sides are active. */
|
|
migrate_set_state(&s->state, MIGRATION_STATUS_POSTCOPY_RECOVER,
|
|
MIGRATION_STATUS_POSTCOPY_ACTIVE);
|
|
|
|
/* Notify send thread that time to continue send pages */
|
|
qemu_sem_post(&s->rp_state.rp_sem);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Handles messages sent on the return path towards the source VM
|
|
*
|
|
*/
|
|
static void *source_return_path_thread(void *opaque)
|
|
{
|
|
MigrationState *ms = opaque;
|
|
QEMUFile *rp = ms->rp_state.from_dst_file;
|
|
uint16_t header_len, header_type;
|
|
uint8_t buf[512];
|
|
uint32_t tmp32, sibling_error;
|
|
ram_addr_t start = 0; /* =0 to silence warning */
|
|
size_t len = 0, expected_len;
|
|
int res;
|
|
|
|
trace_source_return_path_thread_entry();
|
|
rcu_register_thread();
|
|
|
|
retry:
|
|
while (!ms->rp_state.error && !qemu_file_get_error(rp) &&
|
|
migration_is_setup_or_active(ms->state)) {
|
|
trace_source_return_path_thread_loop_top();
|
|
header_type = qemu_get_be16(rp);
|
|
header_len = qemu_get_be16(rp);
|
|
|
|
if (qemu_file_get_error(rp)) {
|
|
mark_source_rp_bad(ms);
|
|
goto out;
|
|
}
|
|
|
|
if (header_type >= MIG_RP_MSG_MAX ||
|
|
header_type == MIG_RP_MSG_INVALID) {
|
|
error_report("RP: Received invalid message 0x%04x length 0x%04x",
|
|
header_type, header_len);
|
|
mark_source_rp_bad(ms);
|
|
goto out;
|
|
}
|
|
|
|
if ((rp_cmd_args[header_type].len != -1 &&
|
|
header_len != rp_cmd_args[header_type].len) ||
|
|
header_len > sizeof(buf)) {
|
|
error_report("RP: Received '%s' message (0x%04x) with"
|
|
"incorrect length %d expecting %zu",
|
|
rp_cmd_args[header_type].name, header_type, header_len,
|
|
(size_t)rp_cmd_args[header_type].len);
|
|
mark_source_rp_bad(ms);
|
|
goto out;
|
|
}
|
|
|
|
/* We know we've got a valid header by this point */
|
|
res = qemu_get_buffer(rp, buf, header_len);
|
|
if (res != header_len) {
|
|
error_report("RP: Failed reading data for message 0x%04x"
|
|
" read %d expected %d",
|
|
header_type, res, header_len);
|
|
mark_source_rp_bad(ms);
|
|
goto out;
|
|
}
|
|
|
|
/* OK, we have the message and the data */
|
|
switch (header_type) {
|
|
case MIG_RP_MSG_SHUT:
|
|
sibling_error = ldl_be_p(buf);
|
|
trace_source_return_path_thread_shut(sibling_error);
|
|
if (sibling_error) {
|
|
error_report("RP: Sibling indicated error %d", sibling_error);
|
|
mark_source_rp_bad(ms);
|
|
}
|
|
/*
|
|
* We'll let the main thread deal with closing the RP
|
|
* we could do a shutdown(2) on it, but we're the only user
|
|
* anyway, so there's nothing gained.
|
|
*/
|
|
goto out;
|
|
|
|
case MIG_RP_MSG_PONG:
|
|
tmp32 = ldl_be_p(buf);
|
|
trace_source_return_path_thread_pong(tmp32);
|
|
break;
|
|
|
|
case MIG_RP_MSG_REQ_PAGES:
|
|
start = ldq_be_p(buf);
|
|
len = ldl_be_p(buf + 8);
|
|
migrate_handle_rp_req_pages(ms, NULL, start, len);
|
|
break;
|
|
|
|
case MIG_RP_MSG_REQ_PAGES_ID:
|
|
expected_len = 12 + 1; /* header + termination */
|
|
|
|
if (header_len >= expected_len) {
|
|
start = ldq_be_p(buf);
|
|
len = ldl_be_p(buf + 8);
|
|
/* Now we expect an idstr */
|
|
tmp32 = buf[12]; /* Length of the following idstr */
|
|
buf[13 + tmp32] = '\0';
|
|
expected_len += tmp32;
|
|
}
|
|
if (header_len != expected_len) {
|
|
error_report("RP: Req_Page_id with length %d expecting %zd",
|
|
header_len, expected_len);
|
|
mark_source_rp_bad(ms);
|
|
goto out;
|
|
}
|
|
migrate_handle_rp_req_pages(ms, (char *)&buf[13], start, len);
|
|
break;
|
|
|
|
case MIG_RP_MSG_RECV_BITMAP:
|
|
if (header_len < 1) {
|
|
error_report("%s: missing block name", __func__);
|
|
mark_source_rp_bad(ms);
|
|
goto out;
|
|
}
|
|
/* Format: len (1B) + idstr (<255B). This ends the idstr. */
|
|
buf[buf[0] + 1] = '\0';
|
|
if (migrate_handle_rp_recv_bitmap(ms, (char *)(buf + 1))) {
|
|
mark_source_rp_bad(ms);
|
|
goto out;
|
|
}
|
|
break;
|
|
|
|
case MIG_RP_MSG_RESUME_ACK:
|
|
tmp32 = ldl_be_p(buf);
|
|
if (migrate_handle_rp_resume_ack(ms, tmp32)) {
|
|
mark_source_rp_bad(ms);
|
|
goto out;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
out:
|
|
res = qemu_file_get_error(rp);
|
|
if (res) {
|
|
if (res == -EIO && migration_in_postcopy()) {
|
|
/*
|
|
* Maybe there is something we can do: it looks like a
|
|
* network down issue, and we pause for a recovery.
|
|
*/
|
|
if (postcopy_pause_return_path_thread(ms)) {
|
|
/* Reload rp, reset the rest */
|
|
if (rp != ms->rp_state.from_dst_file) {
|
|
qemu_fclose(rp);
|
|
rp = ms->rp_state.from_dst_file;
|
|
}
|
|
ms->rp_state.error = false;
|
|
goto retry;
|
|
}
|
|
}
|
|
|
|
trace_source_return_path_thread_bad_end();
|
|
mark_source_rp_bad(ms);
|
|
}
|
|
|
|
trace_source_return_path_thread_end();
|
|
ms->rp_state.from_dst_file = NULL;
|
|
qemu_fclose(rp);
|
|
rcu_unregister_thread();
|
|
return NULL;
|
|
}
|
|
|
|
static int open_return_path_on_source(MigrationState *ms,
|
|
bool create_thread)
|
|
{
|
|
|
|
ms->rp_state.from_dst_file = qemu_file_get_return_path(ms->to_dst_file);
|
|
if (!ms->rp_state.from_dst_file) {
|
|
return -1;
|
|
}
|
|
|
|
trace_open_return_path_on_source();
|
|
|
|
if (!create_thread) {
|
|
/* We're done */
|
|
return 0;
|
|
}
|
|
|
|
qemu_thread_create(&ms->rp_state.rp_thread, "return path",
|
|
source_return_path_thread, ms, QEMU_THREAD_JOINABLE);
|
|
|
|
trace_open_return_path_on_source_continue();
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Returns 0 if the RP was ok, otherwise there was an error on the RP */
|
|
static int await_return_path_close_on_source(MigrationState *ms)
|
|
{
|
|
/*
|
|
* If this is a normal exit then the destination will send a SHUT and the
|
|
* rp_thread will exit, however if there's an error we need to cause
|
|
* it to exit.
|
|
*/
|
|
if (qemu_file_get_error(ms->to_dst_file) && ms->rp_state.from_dst_file) {
|
|
/*
|
|
* shutdown(2), if we have it, will cause it to unblock if it's stuck
|
|
* waiting for the destination.
|
|
*/
|
|
qemu_file_shutdown(ms->rp_state.from_dst_file);
|
|
mark_source_rp_bad(ms);
|
|
}
|
|
trace_await_return_path_close_on_source_joining();
|
|
qemu_thread_join(&ms->rp_state.rp_thread);
|
|
trace_await_return_path_close_on_source_close();
|
|
return ms->rp_state.error;
|
|
}
|
|
|
|
/*
|
|
* Switch from normal iteration to postcopy
|
|
* Returns non-0 on error
|
|
*/
|
|
static int postcopy_start(MigrationState *ms)
|
|
{
|
|
int ret;
|
|
QIOChannelBuffer *bioc;
|
|
QEMUFile *fb;
|
|
int64_t time_at_stop = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
|
|
int64_t bandwidth = migrate_max_postcopy_bandwidth();
|
|
bool restart_block = false;
|
|
int cur_state = MIGRATION_STATUS_ACTIVE;
|
|
if (!migrate_pause_before_switchover()) {
|
|
migrate_set_state(&ms->state, MIGRATION_STATUS_ACTIVE,
|
|
MIGRATION_STATUS_POSTCOPY_ACTIVE);
|
|
}
|
|
|
|
trace_postcopy_start();
|
|
qemu_mutex_lock_iothread();
|
|
trace_postcopy_start_set_run();
|
|
|
|
qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER, NULL);
|
|
global_state_store();
|
|
ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
|
|
if (ret < 0) {
|
|
goto fail;
|
|
}
|
|
|
|
ret = migration_maybe_pause(ms, &cur_state,
|
|
MIGRATION_STATUS_POSTCOPY_ACTIVE);
|
|
if (ret < 0) {
|
|
goto fail;
|
|
}
|
|
|
|
ret = bdrv_inactivate_all();
|
|
if (ret < 0) {
|
|
goto fail;
|
|
}
|
|
restart_block = true;
|
|
|
|
/*
|
|
* Cause any non-postcopiable, but iterative devices to
|
|
* send out their final data.
|
|
*/
|
|
qemu_savevm_state_complete_precopy(ms->to_dst_file, true, false);
|
|
|
|
/*
|
|
* in Finish migrate and with the io-lock held everything should
|
|
* be quiet, but we've potentially still got dirty pages and we
|
|
* need to tell the destination to throw any pages it's already received
|
|
* that are dirty
|
|
*/
|
|
if (migrate_postcopy_ram()) {
|
|
if (ram_postcopy_send_discard_bitmap(ms)) {
|
|
error_report("postcopy send discard bitmap failed");
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* send rest of state - note things that are doing postcopy
|
|
* will notice we're in POSTCOPY_ACTIVE and not actually
|
|
* wrap their state up here
|
|
*/
|
|
/* 0 max-postcopy-bandwidth means unlimited */
|
|
if (!bandwidth) {
|
|
qemu_file_set_rate_limit(ms->to_dst_file, INT64_MAX);
|
|
} else {
|
|
qemu_file_set_rate_limit(ms->to_dst_file, bandwidth / XFER_LIMIT_RATIO);
|
|
}
|
|
if (migrate_postcopy_ram()) {
|
|
/* Ping just for debugging, helps line traces up */
|
|
qemu_savevm_send_ping(ms->to_dst_file, 2);
|
|
}
|
|
|
|
/*
|
|
* While loading the device state we may trigger page transfer
|
|
* requests and the fd must be free to process those, and thus
|
|
* the destination must read the whole device state off the fd before
|
|
* it starts processing it. Unfortunately the ad-hoc migration format
|
|
* doesn't allow the destination to know the size to read without fully
|
|
* parsing it through each devices load-state code (especially the open
|
|
* coded devices that use get/put).
|
|
* So we wrap the device state up in a package with a length at the start;
|
|
* to do this we use a qemu_buf to hold the whole of the device state.
|
|
*/
|
|
bioc = qio_channel_buffer_new(4096);
|
|
qio_channel_set_name(QIO_CHANNEL(bioc), "migration-postcopy-buffer");
|
|
fb = qemu_fopen_channel_output(QIO_CHANNEL(bioc));
|
|
object_unref(OBJECT(bioc));
|
|
|
|
/*
|
|
* Make sure the receiver can get incoming pages before we send the rest
|
|
* of the state
|
|
*/
|
|
qemu_savevm_send_postcopy_listen(fb);
|
|
|
|
qemu_savevm_state_complete_precopy(fb, false, false);
|
|
if (migrate_postcopy_ram()) {
|
|
qemu_savevm_send_ping(fb, 3);
|
|
}
|
|
|
|
qemu_savevm_send_postcopy_run(fb);
|
|
|
|
/* <><> end of stuff going into the package */
|
|
|
|
/* Last point of recovery; as soon as we send the package the destination
|
|
* can open devices and potentially start running.
|
|
* Lets just check again we've not got any errors.
|
|
*/
|
|
ret = qemu_file_get_error(ms->to_dst_file);
|
|
if (ret) {
|
|
error_report("postcopy_start: Migration stream errored (pre package)");
|
|
goto fail_closefb;
|
|
}
|
|
|
|
restart_block = false;
|
|
|
|
/* Now send that blob */
|
|
if (qemu_savevm_send_packaged(ms->to_dst_file, bioc->data, bioc->usage)) {
|
|
goto fail_closefb;
|
|
}
|
|
qemu_fclose(fb);
|
|
|
|
/* Send a notify to give a chance for anything that needs to happen
|
|
* at the transition to postcopy and after the device state; in particular
|
|
* spice needs to trigger a transition now
|
|
*/
|
|
ms->postcopy_after_devices = true;
|
|
notifier_list_notify(&migration_state_notifiers, ms);
|
|
|
|
ms->downtime = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) - time_at_stop;
|
|
|
|
qemu_mutex_unlock_iothread();
|
|
|
|
if (migrate_postcopy_ram()) {
|
|
/*
|
|
* Although this ping is just for debug, it could potentially be
|
|
* used for getting a better measurement of downtime at the source.
|
|
*/
|
|
qemu_savevm_send_ping(ms->to_dst_file, 4);
|
|
}
|
|
|
|
if (migrate_release_ram()) {
|
|
ram_postcopy_migrated_memory_release(ms);
|
|
}
|
|
|
|
ret = qemu_file_get_error(ms->to_dst_file);
|
|
if (ret) {
|
|
error_report("postcopy_start: Migration stream errored");
|
|
migrate_set_state(&ms->state, MIGRATION_STATUS_POSTCOPY_ACTIVE,
|
|
MIGRATION_STATUS_FAILED);
|
|
}
|
|
|
|
return ret;
|
|
|
|
fail_closefb:
|
|
qemu_fclose(fb);
|
|
fail:
|
|
migrate_set_state(&ms->state, MIGRATION_STATUS_POSTCOPY_ACTIVE,
|
|
MIGRATION_STATUS_FAILED);
|
|
if (restart_block) {
|
|
/* A failure happened early enough that we know the destination hasn't
|
|
* accessed block devices, so we're safe to recover.
|
|
*/
|
|
Error *local_err = NULL;
|
|
|
|
bdrv_invalidate_cache_all(&local_err);
|
|
if (local_err) {
|
|
error_report_err(local_err);
|
|
}
|
|
}
|
|
qemu_mutex_unlock_iothread();
|
|
return -1;
|
|
}
|
|
|
|
/**
|
|
* migration_maybe_pause: Pause if required to by
|
|
* migrate_pause_before_switchover called with the iothread locked
|
|
* Returns: 0 on success
|
|
*/
|
|
static int migration_maybe_pause(MigrationState *s,
|
|
int *current_active_state,
|
|
int new_state)
|
|
{
|
|
if (!migrate_pause_before_switchover()) {
|
|
return 0;
|
|
}
|
|
|
|
/* Since leaving this state is not atomic with posting the semaphore
|
|
* it's possible that someone could have issued multiple migrate_continue
|
|
* and the semaphore is incorrectly positive at this point;
|
|
* the docs say it's undefined to reinit a semaphore that's already
|
|
* init'd, so use timedwait to eat up any existing posts.
|
|
*/
|
|
while (qemu_sem_timedwait(&s->pause_sem, 1) == 0) {
|
|
/* This block intentionally left blank */
|
|
}
|
|
|
|
qemu_mutex_unlock_iothread();
|
|
migrate_set_state(&s->state, *current_active_state,
|
|
MIGRATION_STATUS_PRE_SWITCHOVER);
|
|
qemu_sem_wait(&s->pause_sem);
|
|
migrate_set_state(&s->state, MIGRATION_STATUS_PRE_SWITCHOVER,
|
|
new_state);
|
|
*current_active_state = new_state;
|
|
qemu_mutex_lock_iothread();
|
|
|
|
return s->state == new_state ? 0 : -EINVAL;
|
|
}
|
|
|
|
/**
|
|
* migration_completion: Used by migration_thread when there's not much left.
|
|
* The caller 'breaks' the loop when this returns.
|
|
*
|
|
* @s: Current migration state
|
|
*/
|
|
static void migration_completion(MigrationState *s)
|
|
{
|
|
int ret;
|
|
int current_active_state = s->state;
|
|
|
|
if (s->state == MIGRATION_STATUS_ACTIVE) {
|
|
qemu_mutex_lock_iothread();
|
|
s->downtime_start = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
|
|
qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER, NULL);
|
|
s->vm_was_running = runstate_is_running();
|
|
ret = global_state_store();
|
|
|
|
if (!ret) {
|
|
bool inactivate = !migrate_colo_enabled();
|
|
ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
|
|
if (ret >= 0) {
|
|
ret = migration_maybe_pause(s, ¤t_active_state,
|
|
MIGRATION_STATUS_DEVICE);
|
|
}
|
|
if (ret >= 0) {
|
|
qemu_file_set_rate_limit(s->to_dst_file, INT64_MAX);
|
|
ret = qemu_savevm_state_complete_precopy(s->to_dst_file, false,
|
|
inactivate);
|
|
}
|
|
if (inactivate && ret >= 0) {
|
|
s->block_inactive = true;
|
|
}
|
|
}
|
|
qemu_mutex_unlock_iothread();
|
|
|
|
if (ret < 0) {
|
|
goto fail;
|
|
}
|
|
} else if (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) {
|
|
trace_migration_completion_postcopy_end();
|
|
|
|
qemu_savevm_state_complete_postcopy(s->to_dst_file);
|
|
trace_migration_completion_postcopy_end_after_complete();
|
|
}
|
|
|
|
/*
|
|
* If rp was opened we must clean up the thread before
|
|
* cleaning everything else up (since if there are no failures
|
|
* it will wait for the destination to send it's status in
|
|
* a SHUT command).
|
|
*/
|
|
if (s->rp_state.from_dst_file) {
|
|
int rp_error;
|
|
trace_migration_return_path_end_before();
|
|
rp_error = await_return_path_close_on_source(s);
|
|
trace_migration_return_path_end_after(rp_error);
|
|
if (rp_error) {
|
|
goto fail_invalidate;
|
|
}
|
|
}
|
|
|
|
if (qemu_file_get_error(s->to_dst_file)) {
|
|
trace_migration_completion_file_err();
|
|
goto fail_invalidate;
|
|
}
|
|
|
|
if (!migrate_colo_enabled()) {
|
|
migrate_set_state(&s->state, current_active_state,
|
|
MIGRATION_STATUS_COMPLETED);
|
|
}
|
|
|
|
return;
|
|
|
|
fail_invalidate:
|
|
/* If not doing postcopy, vm_start() will be called: let's regain
|
|
* control on images.
|
|
*/
|
|
if (s->state == MIGRATION_STATUS_ACTIVE ||
|
|
s->state == MIGRATION_STATUS_DEVICE) {
|
|
Error *local_err = NULL;
|
|
|
|
qemu_mutex_lock_iothread();
|
|
bdrv_invalidate_cache_all(&local_err);
|
|
if (local_err) {
|
|
error_report_err(local_err);
|
|
} else {
|
|
s->block_inactive = false;
|
|
}
|
|
qemu_mutex_unlock_iothread();
|
|
}
|
|
|
|
fail:
|
|
migrate_set_state(&s->state, current_active_state,
|
|
MIGRATION_STATUS_FAILED);
|
|
}
|
|
|
|
bool migrate_colo_enabled(void)
|
|
{
|
|
MigrationState *s = migrate_get_current();
|
|
return s->enabled_capabilities[MIGRATION_CAPABILITY_X_COLO];
|
|
}
|
|
|
|
typedef enum MigThrError {
|
|
/* No error detected */
|
|
MIG_THR_ERR_NONE = 0,
|
|
/* Detected error, but resumed successfully */
|
|
MIG_THR_ERR_RECOVERED = 1,
|
|
/* Detected fatal error, need to exit */
|
|
MIG_THR_ERR_FATAL = 2,
|
|
} MigThrError;
|
|
|
|
static int postcopy_resume_handshake(MigrationState *s)
|
|
{
|
|
qemu_savevm_send_postcopy_resume(s->to_dst_file);
|
|
|
|
while (s->state == MIGRATION_STATUS_POSTCOPY_RECOVER) {
|
|
qemu_sem_wait(&s->rp_state.rp_sem);
|
|
}
|
|
|
|
if (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) {
|
|
return 0;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
/* Return zero if success, or <0 for error */
|
|
static int postcopy_do_resume(MigrationState *s)
|
|
{
|
|
int ret;
|
|
|
|
/*
|
|
* Call all the resume_prepare() hooks, so that modules can be
|
|
* ready for the migration resume.
|
|
*/
|
|
ret = qemu_savevm_state_resume_prepare(s);
|
|
if (ret) {
|
|
error_report("%s: resume_prepare() failure detected: %d",
|
|
__func__, ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Last handshake with destination on the resume (destination will
|
|
* switch to postcopy-active afterwards)
|
|
*/
|
|
ret = postcopy_resume_handshake(s);
|
|
if (ret) {
|
|
error_report("%s: handshake failed: %d", __func__, ret);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* We don't return until we are in a safe state to continue current
|
|
* postcopy migration. Returns MIG_THR_ERR_RECOVERED if recovered, or
|
|
* MIG_THR_ERR_FATAL if unrecovery failure happened.
|
|
*/
|
|
static MigThrError postcopy_pause(MigrationState *s)
|
|
{
|
|
assert(s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE);
|
|
|
|
while (true) {
|
|
QEMUFile *file;
|
|
|
|
migrate_set_state(&s->state, s->state,
|
|
MIGRATION_STATUS_POSTCOPY_PAUSED);
|
|
|
|
/* Current channel is possibly broken. Release it. */
|
|
assert(s->to_dst_file);
|
|
qemu_mutex_lock(&s->qemu_file_lock);
|
|
file = s->to_dst_file;
|
|
s->to_dst_file = NULL;
|
|
qemu_mutex_unlock(&s->qemu_file_lock);
|
|
|
|
qemu_file_shutdown(file);
|
|
qemu_fclose(file);
|
|
|
|
error_report("Detected IO failure for postcopy. "
|
|
"Migration paused.");
|
|
|
|
/*
|
|
* We wait until things fixed up. Then someone will setup the
|
|
* status back for us.
|
|
*/
|
|
while (s->state == MIGRATION_STATUS_POSTCOPY_PAUSED) {
|
|
qemu_sem_wait(&s->postcopy_pause_sem);
|
|
}
|
|
|
|
if (s->state == MIGRATION_STATUS_POSTCOPY_RECOVER) {
|
|
/* Woken up by a recover procedure. Give it a shot */
|
|
|
|
/*
|
|
* Firstly, let's wake up the return path now, with a new
|
|
* return path channel.
|
|
*/
|
|
qemu_sem_post(&s->postcopy_pause_rp_sem);
|
|
|
|
/* Do the resume logic */
|
|
if (postcopy_do_resume(s) == 0) {
|
|
/* Let's continue! */
|
|
trace_postcopy_pause_continued();
|
|
return MIG_THR_ERR_RECOVERED;
|
|
} else {
|
|
/*
|
|
* Something wrong happened during the recovery, let's
|
|
* pause again. Pause is always better than throwing
|
|
* data away.
|
|
*/
|
|
continue;
|
|
}
|
|
} else {
|
|
/* This is not right... Time to quit. */
|
|
return MIG_THR_ERR_FATAL;
|
|
}
|
|
}
|
|
}
|
|
|
|
static MigThrError migration_detect_error(MigrationState *s)
|
|
{
|
|
int ret;
|
|
int state = s->state;
|
|
Error *local_error = NULL;
|
|
|
|
if (state == MIGRATION_STATUS_CANCELLING ||
|
|
state == MIGRATION_STATUS_CANCELLED) {
|
|
/* End the migration, but don't set the state to failed */
|
|
return MIG_THR_ERR_FATAL;
|
|
}
|
|
|
|
/* Try to detect any file errors */
|
|
ret = qemu_file_get_error_obj(s->to_dst_file, &local_error);
|
|
if (!ret) {
|
|
/* Everything is fine */
|
|
assert(!local_error);
|
|
return MIG_THR_ERR_NONE;
|
|
}
|
|
|
|
if (local_error) {
|
|
migrate_set_error(s, local_error);
|
|
error_free(local_error);
|
|
}
|
|
|
|
if (state == MIGRATION_STATUS_POSTCOPY_ACTIVE && ret == -EIO) {
|
|
/*
|
|
* For postcopy, we allow the network to be down for a
|
|
* while. After that, it can be continued by a
|
|
* recovery phase.
|
|
*/
|
|
return postcopy_pause(s);
|
|
} else {
|
|
/*
|
|
* For precopy (or postcopy with error outside IO), we fail
|
|
* with no time.
|
|
*/
|
|
migrate_set_state(&s->state, state, MIGRATION_STATUS_FAILED);
|
|
trace_migration_thread_file_err();
|
|
|
|
/* Time to stop the migration, now. */
|
|
return MIG_THR_ERR_FATAL;
|
|
}
|
|
}
|
|
|
|
/* How many bytes have we transferred since the beginning of the migration */
|
|
static uint64_t migration_total_bytes(MigrationState *s)
|
|
{
|
|
return qemu_ftell(s->to_dst_file) + ram_counters.multifd_bytes;
|
|
}
|
|
|
|
static void migration_calculate_complete(MigrationState *s)
|
|
{
|
|
uint64_t bytes = migration_total_bytes(s);
|
|
int64_t end_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
|
|
int64_t transfer_time;
|
|
|
|
s->total_time = end_time - s->start_time;
|
|
if (!s->downtime) {
|
|
/*
|
|
* It's still not set, so we are precopy migration. For
|
|
* postcopy, downtime is calculated during postcopy_start().
|
|
*/
|
|
s->downtime = end_time - s->downtime_start;
|
|
}
|
|
|
|
transfer_time = s->total_time - s->setup_time;
|
|
if (transfer_time) {
|
|
s->mbps = ((double) bytes * 8.0) / transfer_time / 1000;
|
|
}
|
|
}
|
|
|
|
static void update_iteration_initial_status(MigrationState *s)
|
|
{
|
|
/*
|
|
* Update these three fields at the same time to avoid mismatch info lead
|
|
* wrong speed calculation.
|
|
*/
|
|
s->iteration_start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
|
|
s->iteration_initial_bytes = migration_total_bytes(s);
|
|
s->iteration_initial_pages = ram_get_total_transferred_pages();
|
|
}
|
|
|
|
static void migration_update_counters(MigrationState *s,
|
|
int64_t current_time)
|
|
{
|
|
uint64_t transferred, transferred_pages, time_spent;
|
|
uint64_t current_bytes; /* bytes transferred since the beginning */
|
|
double bandwidth;
|
|
|
|
if (current_time < s->iteration_start_time + BUFFER_DELAY) {
|
|
return;
|
|
}
|
|
|
|
current_bytes = migration_total_bytes(s);
|
|
transferred = current_bytes - s->iteration_initial_bytes;
|
|
time_spent = current_time - s->iteration_start_time;
|
|
bandwidth = (double)transferred / time_spent;
|
|
s->threshold_size = bandwidth * s->parameters.downtime_limit;
|
|
|
|
s->mbps = (((double) transferred * 8.0) /
|
|
((double) time_spent / 1000.0)) / 1000.0 / 1000.0;
|
|
|
|
transferred_pages = ram_get_total_transferred_pages() -
|
|
s->iteration_initial_pages;
|
|
s->pages_per_second = (double) transferred_pages /
|
|
(((double) time_spent / 1000.0));
|
|
|
|
/*
|
|
* if we haven't sent anything, we don't want to
|
|
* recalculate. 10000 is a small enough number for our purposes
|
|
*/
|
|
if (ram_counters.dirty_pages_rate && transferred > 10000) {
|
|
s->expected_downtime = ram_counters.remaining / bandwidth;
|
|
}
|
|
|
|
qemu_file_reset_rate_limit(s->to_dst_file);
|
|
|
|
update_iteration_initial_status(s);
|
|
|
|
trace_migrate_transferred(transferred, time_spent,
|
|
bandwidth, s->threshold_size);
|
|
}
|
|
|
|
/* Migration thread iteration status */
|
|
typedef enum {
|
|
MIG_ITERATE_RESUME, /* Resume current iteration */
|
|
MIG_ITERATE_SKIP, /* Skip current iteration */
|
|
MIG_ITERATE_BREAK, /* Break the loop */
|
|
} MigIterateState;
|
|
|
|
/*
|
|
* Return true if continue to the next iteration directly, false
|
|
* otherwise.
|
|
*/
|
|
static MigIterateState migration_iteration_run(MigrationState *s)
|
|
{
|
|
uint64_t pending_size, pend_pre, pend_compat, pend_post;
|
|
bool in_postcopy = s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE;
|
|
|
|
qemu_savevm_state_pending(s->to_dst_file, s->threshold_size, &pend_pre,
|
|
&pend_compat, &pend_post);
|
|
pending_size = pend_pre + pend_compat + pend_post;
|
|
|
|
trace_migrate_pending(pending_size, s->threshold_size,
|
|
pend_pre, pend_compat, pend_post);
|
|
|
|
if (pending_size && pending_size >= s->threshold_size) {
|
|
/* Still a significant amount to transfer */
|
|
if (!in_postcopy && pend_pre <= s->threshold_size &&
|
|
atomic_read(&s->start_postcopy)) {
|
|
if (postcopy_start(s)) {
|
|
error_report("%s: postcopy failed to start", __func__);
|
|
}
|
|
return MIG_ITERATE_SKIP;
|
|
}
|
|
/* Just another iteration step */
|
|
qemu_savevm_state_iterate(s->to_dst_file, in_postcopy);
|
|
} else {
|
|
trace_migration_thread_low_pending(pending_size);
|
|
migration_completion(s);
|
|
return MIG_ITERATE_BREAK;
|
|
}
|
|
|
|
return MIG_ITERATE_RESUME;
|
|
}
|
|
|
|
static void migration_iteration_finish(MigrationState *s)
|
|
{
|
|
/* If we enabled cpu throttling for auto-converge, turn it off. */
|
|
cpu_throttle_stop();
|
|
|
|
qemu_mutex_lock_iothread();
|
|
switch (s->state) {
|
|
case MIGRATION_STATUS_COMPLETED:
|
|
migration_calculate_complete(s);
|
|
runstate_set(RUN_STATE_POSTMIGRATE);
|
|
break;
|
|
|
|
case MIGRATION_STATUS_ACTIVE:
|
|
/*
|
|
* We should really assert here, but since it's during
|
|
* migration, let's try to reduce the usage of assertions.
|
|
*/
|
|
if (!migrate_colo_enabled()) {
|
|
error_report("%s: critical error: calling COLO code without "
|
|
"COLO enabled", __func__);
|
|
}
|
|
migrate_start_colo_process(s);
|
|
/*
|
|
* Fixme: we will run VM in COLO no matter its old running state.
|
|
* After exited COLO, we will keep running.
|
|
*/
|
|
s->vm_was_running = true;
|
|
/* Fallthrough */
|
|
case MIGRATION_STATUS_FAILED:
|
|
case MIGRATION_STATUS_CANCELLED:
|
|
case MIGRATION_STATUS_CANCELLING:
|
|
if (s->vm_was_running) {
|
|
vm_start();
|
|
} else {
|
|
if (runstate_check(RUN_STATE_FINISH_MIGRATE)) {
|
|
runstate_set(RUN_STATE_POSTMIGRATE);
|
|
}
|
|
}
|
|
break;
|
|
|
|
default:
|
|
/* Should not reach here, but if so, forgive the VM. */
|
|
error_report("%s: Unknown ending state %d", __func__, s->state);
|
|
break;
|
|
}
|
|
migrate_fd_cleanup_schedule(s);
|
|
qemu_mutex_unlock_iothread();
|
|
}
|
|
|
|
void migration_make_urgent_request(void)
|
|
{
|
|
qemu_sem_post(&migrate_get_current()->rate_limit_sem);
|
|
}
|
|
|
|
void migration_consume_urgent_request(void)
|
|
{
|
|
qemu_sem_wait(&migrate_get_current()->rate_limit_sem);
|
|
}
|
|
|
|
/*
|
|
* Master migration thread on the source VM.
|
|
* It drives the migration and pumps the data down the outgoing channel.
|
|
*/
|
|
static void *migration_thread(void *opaque)
|
|
{
|
|
MigrationState *s = opaque;
|
|
int64_t setup_start = qemu_clock_get_ms(QEMU_CLOCK_HOST);
|
|
MigThrError thr_error;
|
|
bool urgent = false;
|
|
|
|
rcu_register_thread();
|
|
|
|
object_ref(OBJECT(s));
|
|
update_iteration_initial_status(s);
|
|
|
|
qemu_savevm_state_header(s->to_dst_file);
|
|
|
|
/*
|
|
* If we opened the return path, we need to make sure dst has it
|
|
* opened as well.
|
|
*/
|
|
if (s->rp_state.from_dst_file) {
|
|
/* Now tell the dest that it should open its end so it can reply */
|
|
qemu_savevm_send_open_return_path(s->to_dst_file);
|
|
|
|
/* And do a ping that will make stuff easier to debug */
|
|
qemu_savevm_send_ping(s->to_dst_file, 1);
|
|
}
|
|
|
|
if (migrate_postcopy()) {
|
|
/*
|
|
* Tell the destination that we *might* want to do postcopy later;
|
|
* if the other end can't do postcopy it should fail now, nice and
|
|
* early.
|
|
*/
|
|
qemu_savevm_send_postcopy_advise(s->to_dst_file);
|
|
}
|
|
|
|
if (migrate_colo_enabled()) {
|
|
/* Notify migration destination that we enable COLO */
|
|
qemu_savevm_send_colo_enable(s->to_dst_file);
|
|
}
|
|
|
|
qemu_savevm_state_setup(s->to_dst_file);
|
|
|
|
if (qemu_savevm_nr_failover_devices()) {
|
|
migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
|
|
MIGRATION_STATUS_WAIT_UNPLUG);
|
|
|
|
while (s->state == MIGRATION_STATUS_WAIT_UNPLUG &&
|
|
qemu_savevm_state_guest_unplug_pending()) {
|
|
qemu_sem_timedwait(&s->wait_unplug_sem, 250);
|
|
}
|
|
|
|
migrate_set_state(&s->state, MIGRATION_STATUS_WAIT_UNPLUG,
|
|
MIGRATION_STATUS_ACTIVE);
|
|
}
|
|
|
|
s->setup_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) - setup_start;
|
|
migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
|
|
MIGRATION_STATUS_ACTIVE);
|
|
|
|
trace_migration_thread_setup_complete();
|
|
|
|
while (migration_is_active(s)) {
|
|
int64_t current_time;
|
|
|
|
if (urgent || !qemu_file_rate_limit(s->to_dst_file)) {
|
|
MigIterateState iter_state = migration_iteration_run(s);
|
|
if (iter_state == MIG_ITERATE_SKIP) {
|
|
continue;
|
|
} else if (iter_state == MIG_ITERATE_BREAK) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Try to detect any kind of failures, and see whether we
|
|
* should stop the migration now.
|
|
*/
|
|
thr_error = migration_detect_error(s);
|
|
if (thr_error == MIG_THR_ERR_FATAL) {
|
|
/* Stop migration */
|
|
break;
|
|
} else if (thr_error == MIG_THR_ERR_RECOVERED) {
|
|
/*
|
|
* Just recovered from a e.g. network failure, reset all
|
|
* the local variables. This is important to avoid
|
|
* breaking transferred_bytes and bandwidth calculation
|
|
*/
|
|
update_iteration_initial_status(s);
|
|
}
|
|
|
|
current_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
|
|
|
|
migration_update_counters(s, current_time);
|
|
|
|
urgent = false;
|
|
if (qemu_file_rate_limit(s->to_dst_file)) {
|
|
/* Wait for a delay to do rate limiting OR
|
|
* something urgent to post the semaphore.
|
|
*/
|
|
int ms = s->iteration_start_time + BUFFER_DELAY - current_time;
|
|
trace_migration_thread_ratelimit_pre(ms);
|
|
if (qemu_sem_timedwait(&s->rate_limit_sem, ms) == 0) {
|
|
/* We were worken by one or more urgent things but
|
|
* the timedwait will have consumed one of them.
|
|
* The service routine for the urgent wake will dec
|
|
* the semaphore itself for each item it consumes,
|
|
* so add this one we just eat back.
|
|
*/
|
|
qemu_sem_post(&s->rate_limit_sem);
|
|
urgent = true;
|
|
}
|
|
trace_migration_thread_ratelimit_post(urgent);
|
|
}
|
|
}
|
|
|
|
trace_migration_thread_after_loop();
|
|
migration_iteration_finish(s);
|
|
object_unref(OBJECT(s));
|
|
rcu_unregister_thread();
|
|
return NULL;
|
|
}
|
|
|
|
void migrate_fd_connect(MigrationState *s, Error *error_in)
|
|
{
|
|
int64_t rate_limit;
|
|
bool resume = s->state == MIGRATION_STATUS_POSTCOPY_PAUSED;
|
|
|
|
s->expected_downtime = s->parameters.downtime_limit;
|
|
s->cleanup_bh = qemu_bh_new(migrate_fd_cleanup_bh, s);
|
|
if (error_in) {
|
|
migrate_fd_error(s, error_in);
|
|
migrate_fd_cleanup(s);
|
|
return;
|
|
}
|
|
|
|
if (resume) {
|
|
/* This is a resumed migration */
|
|
rate_limit = s->parameters.max_postcopy_bandwidth /
|
|
XFER_LIMIT_RATIO;
|
|
} else {
|
|
/* This is a fresh new migration */
|
|
rate_limit = s->parameters.max_bandwidth / XFER_LIMIT_RATIO;
|
|
|
|
/* Notify before starting migration thread */
|
|
notifier_list_notify(&migration_state_notifiers, s);
|
|
}
|
|
|
|
qemu_file_set_rate_limit(s->to_dst_file, rate_limit);
|
|
qemu_file_set_blocking(s->to_dst_file, true);
|
|
|
|
/*
|
|
* Open the return path. For postcopy, it is used exclusively. For
|
|
* precopy, only if user specified "return-path" capability would
|
|
* QEMU uses the return path.
|
|
*/
|
|
if (migrate_postcopy_ram() || migrate_use_return_path()) {
|
|
if (open_return_path_on_source(s, !resume)) {
|
|
error_report("Unable to open return-path for postcopy");
|
|
migrate_set_state(&s->state, s->state, MIGRATION_STATUS_FAILED);
|
|
migrate_fd_cleanup(s);
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (resume) {
|
|
/* Wakeup the main migration thread to do the recovery */
|
|
migrate_set_state(&s->state, MIGRATION_STATUS_POSTCOPY_PAUSED,
|
|
MIGRATION_STATUS_POSTCOPY_RECOVER);
|
|
qemu_sem_post(&s->postcopy_pause_sem);
|
|
return;
|
|
}
|
|
|
|
if (multifd_save_setup() != 0) {
|
|
migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
|
|
MIGRATION_STATUS_FAILED);
|
|
migrate_fd_cleanup(s);
|
|
return;
|
|
}
|
|
qemu_thread_create(&s->thread, "live_migration", migration_thread, s,
|
|
QEMU_THREAD_JOINABLE);
|
|
s->migration_thread_running = true;
|
|
}
|
|
|
|
void migration_global_dump(Monitor *mon)
|
|
{
|
|
MigrationState *ms = migrate_get_current();
|
|
|
|
monitor_printf(mon, "globals:\n");
|
|
monitor_printf(mon, "store-global-state: %s\n",
|
|
ms->store_global_state ? "on" : "off");
|
|
monitor_printf(mon, "only-migratable: %s\n",
|
|
only_migratable ? "on" : "off");
|
|
monitor_printf(mon, "send-configuration: %s\n",
|
|
ms->send_configuration ? "on" : "off");
|
|
monitor_printf(mon, "send-section-footer: %s\n",
|
|
ms->send_section_footer ? "on" : "off");
|
|
monitor_printf(mon, "decompress-error-check: %s\n",
|
|
ms->decompress_error_check ? "on" : "off");
|
|
monitor_printf(mon, "clear-bitmap-shift: %u\n",
|
|
ms->clear_bitmap_shift);
|
|
}
|
|
|
|
#define DEFINE_PROP_MIG_CAP(name, x) \
|
|
DEFINE_PROP_BOOL(name, MigrationState, enabled_capabilities[x], false)
|
|
|
|
static Property migration_properties[] = {
|
|
DEFINE_PROP_BOOL("store-global-state", MigrationState,
|
|
store_global_state, true),
|
|
DEFINE_PROP_BOOL("send-configuration", MigrationState,
|
|
send_configuration, true),
|
|
DEFINE_PROP_BOOL("send-section-footer", MigrationState,
|
|
send_section_footer, true),
|
|
DEFINE_PROP_BOOL("decompress-error-check", MigrationState,
|
|
decompress_error_check, true),
|
|
DEFINE_PROP_UINT8("x-clear-bitmap-shift", MigrationState,
|
|
clear_bitmap_shift, CLEAR_BITMAP_SHIFT_DEFAULT),
|
|
|
|
/* Migration parameters */
|
|
DEFINE_PROP_UINT8("x-compress-level", MigrationState,
|
|
parameters.compress_level,
|
|
DEFAULT_MIGRATE_COMPRESS_LEVEL),
|
|
DEFINE_PROP_UINT8("x-compress-threads", MigrationState,
|
|
parameters.compress_threads,
|
|
DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT),
|
|
DEFINE_PROP_BOOL("x-compress-wait-thread", MigrationState,
|
|
parameters.compress_wait_thread, true),
|
|
DEFINE_PROP_UINT8("x-decompress-threads", MigrationState,
|
|
parameters.decompress_threads,
|
|
DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT),
|
|
DEFINE_PROP_UINT8("x-cpu-throttle-initial", MigrationState,
|
|
parameters.cpu_throttle_initial,
|
|
DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL),
|
|
DEFINE_PROP_UINT8("x-cpu-throttle-increment", MigrationState,
|
|
parameters.cpu_throttle_increment,
|
|
DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT),
|
|
DEFINE_PROP_SIZE("x-max-bandwidth", MigrationState,
|
|
parameters.max_bandwidth, MAX_THROTTLE),
|
|
DEFINE_PROP_UINT64("x-downtime-limit", MigrationState,
|
|
parameters.downtime_limit,
|
|
DEFAULT_MIGRATE_SET_DOWNTIME),
|
|
DEFINE_PROP_UINT32("x-checkpoint-delay", MigrationState,
|
|
parameters.x_checkpoint_delay,
|
|
DEFAULT_MIGRATE_X_CHECKPOINT_DELAY),
|
|
DEFINE_PROP_UINT8("multifd-channels", MigrationState,
|
|
parameters.multifd_channels,
|
|
DEFAULT_MIGRATE_MULTIFD_CHANNELS),
|
|
DEFINE_PROP_SIZE("xbzrle-cache-size", MigrationState,
|
|
parameters.xbzrle_cache_size,
|
|
DEFAULT_MIGRATE_XBZRLE_CACHE_SIZE),
|
|
DEFINE_PROP_SIZE("max-postcopy-bandwidth", MigrationState,
|
|
parameters.max_postcopy_bandwidth,
|
|
DEFAULT_MIGRATE_MAX_POSTCOPY_BANDWIDTH),
|
|
DEFINE_PROP_UINT8("max-cpu-throttle", MigrationState,
|
|
parameters.max_cpu_throttle,
|
|
DEFAULT_MIGRATE_MAX_CPU_THROTTLE),
|
|
DEFINE_PROP_SIZE("announce-initial", MigrationState,
|
|
parameters.announce_initial,
|
|
DEFAULT_MIGRATE_ANNOUNCE_INITIAL),
|
|
DEFINE_PROP_SIZE("announce-max", MigrationState,
|
|
parameters.announce_max,
|
|
DEFAULT_MIGRATE_ANNOUNCE_MAX),
|
|
DEFINE_PROP_SIZE("announce-rounds", MigrationState,
|
|
parameters.announce_rounds,
|
|
DEFAULT_MIGRATE_ANNOUNCE_ROUNDS),
|
|
DEFINE_PROP_SIZE("announce-step", MigrationState,
|
|
parameters.announce_step,
|
|
DEFAULT_MIGRATE_ANNOUNCE_STEP),
|
|
|
|
/* Migration capabilities */
|
|
DEFINE_PROP_MIG_CAP("x-xbzrle", MIGRATION_CAPABILITY_XBZRLE),
|
|
DEFINE_PROP_MIG_CAP("x-rdma-pin-all", MIGRATION_CAPABILITY_RDMA_PIN_ALL),
|
|
DEFINE_PROP_MIG_CAP("x-auto-converge", MIGRATION_CAPABILITY_AUTO_CONVERGE),
|
|
DEFINE_PROP_MIG_CAP("x-zero-blocks", MIGRATION_CAPABILITY_ZERO_BLOCKS),
|
|
DEFINE_PROP_MIG_CAP("x-compress", MIGRATION_CAPABILITY_COMPRESS),
|
|
DEFINE_PROP_MIG_CAP("x-events", MIGRATION_CAPABILITY_EVENTS),
|
|
DEFINE_PROP_MIG_CAP("x-postcopy-ram", MIGRATION_CAPABILITY_POSTCOPY_RAM),
|
|
DEFINE_PROP_MIG_CAP("x-colo", MIGRATION_CAPABILITY_X_COLO),
|
|
DEFINE_PROP_MIG_CAP("x-release-ram", MIGRATION_CAPABILITY_RELEASE_RAM),
|
|
DEFINE_PROP_MIG_CAP("x-block", MIGRATION_CAPABILITY_BLOCK),
|
|
DEFINE_PROP_MIG_CAP("x-return-path", MIGRATION_CAPABILITY_RETURN_PATH),
|
|
DEFINE_PROP_MIG_CAP("x-multifd", MIGRATION_CAPABILITY_MULTIFD),
|
|
|
|
DEFINE_PROP_END_OF_LIST(),
|
|
};
|
|
|
|
static void migration_class_init(ObjectClass *klass, void *data)
|
|
{
|
|
DeviceClass *dc = DEVICE_CLASS(klass);
|
|
|
|
dc->user_creatable = false;
|
|
dc->props = migration_properties;
|
|
}
|
|
|
|
static void migration_instance_finalize(Object *obj)
|
|
{
|
|
MigrationState *ms = MIGRATION_OBJ(obj);
|
|
MigrationParameters *params = &ms->parameters;
|
|
|
|
qemu_mutex_destroy(&ms->error_mutex);
|
|
qemu_mutex_destroy(&ms->qemu_file_lock);
|
|
g_free(params->tls_hostname);
|
|
g_free(params->tls_creds);
|
|
qemu_sem_destroy(&ms->wait_unplug_sem);
|
|
qemu_sem_destroy(&ms->rate_limit_sem);
|
|
qemu_sem_destroy(&ms->pause_sem);
|
|
qemu_sem_destroy(&ms->postcopy_pause_sem);
|
|
qemu_sem_destroy(&ms->postcopy_pause_rp_sem);
|
|
qemu_sem_destroy(&ms->rp_state.rp_sem);
|
|
error_free(ms->error);
|
|
}
|
|
|
|
static void migration_instance_init(Object *obj)
|
|
{
|
|
MigrationState *ms = MIGRATION_OBJ(obj);
|
|
MigrationParameters *params = &ms->parameters;
|
|
|
|
ms->state = MIGRATION_STATUS_NONE;
|
|
ms->mbps = -1;
|
|
ms->pages_per_second = -1;
|
|
qemu_sem_init(&ms->pause_sem, 0);
|
|
qemu_mutex_init(&ms->error_mutex);
|
|
|
|
params->tls_hostname = g_strdup("");
|
|
params->tls_creds = g_strdup("");
|
|
|
|
/* Set has_* up only for parameter checks */
|
|
params->has_compress_level = true;
|
|
params->has_compress_threads = true;
|
|
params->has_decompress_threads = true;
|
|
params->has_cpu_throttle_initial = true;
|
|
params->has_cpu_throttle_increment = true;
|
|
params->has_max_bandwidth = true;
|
|
params->has_downtime_limit = true;
|
|
params->has_x_checkpoint_delay = true;
|
|
params->has_block_incremental = true;
|
|
params->has_multifd_channels = true;
|
|
params->has_xbzrle_cache_size = true;
|
|
params->has_max_postcopy_bandwidth = true;
|
|
params->has_max_cpu_throttle = true;
|
|
params->has_announce_initial = true;
|
|
params->has_announce_max = true;
|
|
params->has_announce_rounds = true;
|
|
params->has_announce_step = true;
|
|
|
|
qemu_sem_init(&ms->postcopy_pause_sem, 0);
|
|
qemu_sem_init(&ms->postcopy_pause_rp_sem, 0);
|
|
qemu_sem_init(&ms->rp_state.rp_sem, 0);
|
|
qemu_sem_init(&ms->rate_limit_sem, 0);
|
|
qemu_sem_init(&ms->wait_unplug_sem, 0);
|
|
qemu_mutex_init(&ms->qemu_file_lock);
|
|
}
|
|
|
|
/*
|
|
* Return true if check pass, false otherwise. Error will be put
|
|
* inside errp if provided.
|
|
*/
|
|
static bool migration_object_check(MigrationState *ms, Error **errp)
|
|
{
|
|
MigrationCapabilityStatusList *head = NULL;
|
|
/* Assuming all off */
|
|
bool cap_list[MIGRATION_CAPABILITY__MAX] = { 0 }, ret;
|
|
int i;
|
|
|
|
if (!migrate_params_check(&ms->parameters, errp)) {
|
|
return false;
|
|
}
|
|
|
|
for (i = 0; i < MIGRATION_CAPABILITY__MAX; i++) {
|
|
if (ms->enabled_capabilities[i]) {
|
|
head = migrate_cap_add(head, i, true);
|
|
}
|
|
}
|
|
|
|
ret = migrate_caps_check(cap_list, head, errp);
|
|
|
|
/* It works with head == NULL */
|
|
qapi_free_MigrationCapabilityStatusList(head);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const TypeInfo migration_type = {
|
|
.name = TYPE_MIGRATION,
|
|
/*
|
|
* NOTE: TYPE_MIGRATION is not really a device, as the object is
|
|
* not created using qdev_create(), it is not attached to the qdev
|
|
* device tree, and it is never realized.
|
|
*
|
|
* TODO: Make this TYPE_OBJECT once QOM provides something like
|
|
* TYPE_DEVICE's "-global" properties.
|
|
*/
|
|
.parent = TYPE_DEVICE,
|
|
.class_init = migration_class_init,
|
|
.class_size = sizeof(MigrationClass),
|
|
.instance_size = sizeof(MigrationState),
|
|
.instance_init = migration_instance_init,
|
|
.instance_finalize = migration_instance_finalize,
|
|
};
|
|
|
|
static void register_migration_types(void)
|
|
{
|
|
type_register_static(&migration_type);
|
|
}
|
|
|
|
type_init(register_migration_types);
|