| /* |
| * QEMU live migration |
| * |
| * Copyright IBM, Corp. 2008 |
| * |
| * Authors: |
| * Anthony Liguori <aliguori@us.ibm.com> |
| * |
| * This work is licensed under the terms of the GNU GPL, version 2. See |
| * the COPYING file in the top-level directory. |
| * |
| * Contributions after 2012-01-13 are licensed under the terms of the |
| * GNU GPL, version 2 or (at your option) any later version. |
| */ |
| |
| #include "qemu/osdep.h" |
| #include "qemu/cutils.h" |
| #include "qemu/error-report.h" |
| #include "qemu/main-loop.h" |
| #include "migration/blocker.h" |
| #include "exec.h" |
| #include "fd.h" |
| #include "socket.h" |
| #include "sysemu/runstate.h" |
| #include "sysemu/sysemu.h" |
| #include "sysemu/cpu-throttle.h" |
| #include "rdma.h" |
| #include "ram.h" |
| #include "migration/global_state.h" |
| #include "migration/misc.h" |
| #include "migration.h" |
| #include "savevm.h" |
| #include "qemu-file.h" |
| #include "migration/vmstate.h" |
| #include "block/block.h" |
| #include "qapi/error.h" |
| #include "qapi/clone-visitor.h" |
| #include "qapi/qapi-visit-migration.h" |
| #include "qapi/qapi-visit-sockets.h" |
| #include "qapi/qapi-commands-migration.h" |
| #include "qapi/qapi-events-migration.h" |
| #include "qapi/qmp/qerror.h" |
| #include "qapi/qmp/qnull.h" |
| #include "qemu/rcu.h" |
| #include "block.h" |
| #include "postcopy-ram.h" |
| #include "qemu/thread.h" |
| #include "trace.h" |
| #include "exec/target_page.h" |
| #include "io/channel-buffer.h" |
| #include "io/channel-tls.h" |
| #include "migration/colo.h" |
| #include "hw/boards.h" |
| #include "hw/qdev-properties.h" |
| #include "hw/qdev-properties-system.h" |
| #include "monitor/monitor.h" |
| #include "net/announce.h" |
| #include "qemu/queue.h" |
| #include "multifd.h" |
| #include "qemu/yank.h" |
| #include "sysemu/cpus.h" |
| #include "yank_functions.h" |
| #include "sysemu/qtest.h" |
| |
| #define MAX_THROTTLE (128 << 20) /* Migration transfer speed throttling */ |
| |
| /* Amount of time to allocate to each "chunk" of bandwidth-throttled |
| * data. */ |
| #define BUFFER_DELAY 100 |
| #define XFER_LIMIT_RATIO (1000 / BUFFER_DELAY) |
| |
| /* Time in milliseconds we are allowed to stop the source, |
| * for sending the last part */ |
| #define DEFAULT_MIGRATE_SET_DOWNTIME 300 |
| |
| /* Maximum migrate downtime set to 2000 seconds */ |
| #define MAX_MIGRATE_DOWNTIME_SECONDS 2000 |
| #define MAX_MIGRATE_DOWNTIME (MAX_MIGRATE_DOWNTIME_SECONDS * 1000) |
| |
| /* Default compression thread count */ |
| #define DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT 8 |
| /* Default decompression thread count, usually decompression is at |
| * least 4 times as fast as compression.*/ |
| #define DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT 2 |
| /*0: means nocompress, 1: best speed, ... 9: best compress ratio */ |
| #define DEFAULT_MIGRATE_COMPRESS_LEVEL 1 |
| /* Define default autoconverge cpu throttle migration parameters */ |
| #define DEFAULT_MIGRATE_THROTTLE_TRIGGER_THRESHOLD 50 |
| #define DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL 20 |
| #define DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT 10 |
| #define DEFAULT_MIGRATE_MAX_CPU_THROTTLE 99 |
| |
| /* Migration XBZRLE default cache size */ |
| #define DEFAULT_MIGRATE_XBZRLE_CACHE_SIZE (64 * 1024 * 1024) |
| |
| /* The delay time (in ms) between two COLO checkpoints */ |
| #define DEFAULT_MIGRATE_X_CHECKPOINT_DELAY (200 * 100) |
| #define DEFAULT_MIGRATE_MULTIFD_CHANNELS 2 |
| #define DEFAULT_MIGRATE_MULTIFD_COMPRESSION MULTIFD_COMPRESSION_NONE |
| /* 0: means nocompress, 1: best speed, ... 9: best compress ratio */ |
| #define DEFAULT_MIGRATE_MULTIFD_ZLIB_LEVEL 1 |
| /* 0: means nocompress, 1: best speed, ... 20: best compress ratio */ |
| #define DEFAULT_MIGRATE_MULTIFD_ZSTD_LEVEL 1 |
| |
| /* Background transfer rate for postcopy, 0 means unlimited, note |
| * that page requests can still exceed this limit. |
| */ |
| #define DEFAULT_MIGRATE_MAX_POSTCOPY_BANDWIDTH 0 |
| |
| /* |
| * Parameters for self_announce_delay giving a stream of RARP/ARP |
| * packets after migration. |
| */ |
| #define DEFAULT_MIGRATE_ANNOUNCE_INITIAL 50 |
| #define DEFAULT_MIGRATE_ANNOUNCE_MAX 550 |
| #define DEFAULT_MIGRATE_ANNOUNCE_ROUNDS 5 |
| #define DEFAULT_MIGRATE_ANNOUNCE_STEP 100 |
| |
| static NotifierList migration_state_notifiers = |
| NOTIFIER_LIST_INITIALIZER(migration_state_notifiers); |
| |
| /* Messages sent on the return path from destination to source */ |
| enum mig_rp_message_type { |
| MIG_RP_MSG_INVALID = 0, /* Must be 0 */ |
| MIG_RP_MSG_SHUT, /* sibling will not send any more RP messages */ |
| MIG_RP_MSG_PONG, /* Response to a PING; data (seq: be32 ) */ |
| |
| MIG_RP_MSG_REQ_PAGES_ID, /* data (start: be64, len: be32, id: string) */ |
| MIG_RP_MSG_REQ_PAGES, /* data (start: be64, len: be32) */ |
| MIG_RP_MSG_RECV_BITMAP, /* send recved_bitmap back to source */ |
| MIG_RP_MSG_RESUME_ACK, /* tell source that we are ready to resume */ |
| |
| MIG_RP_MSG_MAX |
| }; |
| |
| /* Migration capabilities set */ |
| struct MigrateCapsSet { |
| int size; /* Capability set size */ |
| MigrationCapability caps[]; /* Variadic array of capabilities */ |
| }; |
| typedef struct MigrateCapsSet MigrateCapsSet; |
| |
| /* Define and initialize MigrateCapsSet */ |
| #define INITIALIZE_MIGRATE_CAPS_SET(_name, ...) \ |
| MigrateCapsSet _name = { \ |
| .size = sizeof((int []) { __VA_ARGS__ }) / sizeof(int), \ |
| .caps = { __VA_ARGS__ } \ |
| } |
| |
| /* Background-snapshot compatibility check list */ |
| static const |
| INITIALIZE_MIGRATE_CAPS_SET(check_caps_background_snapshot, |
| MIGRATION_CAPABILITY_POSTCOPY_RAM, |
| MIGRATION_CAPABILITY_DIRTY_BITMAPS, |
| MIGRATION_CAPABILITY_POSTCOPY_BLOCKTIME, |
| MIGRATION_CAPABILITY_LATE_BLOCK_ACTIVATE, |
| MIGRATION_CAPABILITY_RETURN_PATH, |
| MIGRATION_CAPABILITY_MULTIFD, |
| MIGRATION_CAPABILITY_PAUSE_BEFORE_SWITCHOVER, |
| MIGRATION_CAPABILITY_AUTO_CONVERGE, |
| MIGRATION_CAPABILITY_RELEASE_RAM, |
| MIGRATION_CAPABILITY_RDMA_PIN_ALL, |
| MIGRATION_CAPABILITY_COMPRESS, |
| MIGRATION_CAPABILITY_XBZRLE, |
| MIGRATION_CAPABILITY_X_COLO, |
| MIGRATION_CAPABILITY_VALIDATE_UUID, |
| MIGRATION_CAPABILITY_ZERO_COPY_SEND); |
| |
| /* When we add fault tolerance, we could have several |
| migrations at once. For now we don't need to add |
| dynamic creation of migration */ |
| |
| static MigrationState *current_migration; |
| static MigrationIncomingState *current_incoming; |
| |
| static GSList *migration_blockers; |
| |
| static bool migration_object_check(MigrationState *ms, Error **errp); |
| static int migration_maybe_pause(MigrationState *s, |
| int *current_active_state, |
| int new_state); |
| static void migrate_fd_cancel(MigrationState *s); |
| |
| static bool migrate_allow_multi_channels = true; |
| |
| void migrate_protocol_allow_multi_channels(bool allow) |
| { |
| migrate_allow_multi_channels = allow; |
| } |
| |
| bool migrate_multi_channels_is_allowed(void) |
| { |
| return migrate_allow_multi_channels; |
| } |
| |
| static gint page_request_addr_cmp(gconstpointer ap, gconstpointer bp) |
| { |
| uintptr_t a = (uintptr_t) ap, b = (uintptr_t) bp; |
| |
| return (a > b) - (a < b); |
| } |
| |
| void migration_object_init(void) |
| { |
| /* This can only be called once. */ |
| assert(!current_migration); |
| current_migration = MIGRATION_OBJ(object_new(TYPE_MIGRATION)); |
| |
| /* |
| * Init the migrate incoming object as well no matter whether |
| * we'll use it or not. |
| */ |
| assert(!current_incoming); |
| current_incoming = g_new0(MigrationIncomingState, 1); |
| current_incoming->state = MIGRATION_STATUS_NONE; |
| current_incoming->postcopy_remote_fds = |
| g_array_new(FALSE, TRUE, sizeof(struct PostCopyFD)); |
| qemu_mutex_init(¤t_incoming->rp_mutex); |
| qemu_mutex_init(¤t_incoming->postcopy_prio_thread_mutex); |
| qemu_event_init(¤t_incoming->main_thread_load_event, false); |
| qemu_sem_init(¤t_incoming->postcopy_pause_sem_dst, 0); |
| qemu_sem_init(¤t_incoming->postcopy_pause_sem_fault, 0); |
| qemu_sem_init(¤t_incoming->postcopy_pause_sem_fast_load, 0); |
| qemu_mutex_init(¤t_incoming->page_request_mutex); |
| current_incoming->page_requested = g_tree_new(page_request_addr_cmp); |
| |
| migration_object_check(current_migration, &error_fatal); |
| |
| blk_mig_init(); |
| ram_mig_init(); |
| dirty_bitmap_mig_init(); |
| } |
| |
| void migration_cancel(const Error *error) |
| { |
| if (error) { |
| migrate_set_error(current_migration, error); |
| } |
| migrate_fd_cancel(current_migration); |
| } |
| |
| void migration_shutdown(void) |
| { |
| /* |
| * When the QEMU main thread exit, the COLO thread |
| * may wait a semaphore. So, we should wakeup the |
| * COLO thread before migration shutdown. |
| */ |
| colo_shutdown(); |
| /* |
| * Cancel the current migration - that will (eventually) |
| * stop the migration using this structure |
| */ |
| migration_cancel(NULL); |
| object_unref(OBJECT(current_migration)); |
| |
| /* |
| * Cancel outgoing migration of dirty bitmaps. It should |
| * at least unref used block nodes. |
| */ |
| dirty_bitmap_mig_cancel_outgoing(); |
| |
| /* |
| * Cancel incoming migration of dirty bitmaps. Dirty bitmaps |
| * are non-critical data, and their loss never considered as |
| * something serious. |
| */ |
| dirty_bitmap_mig_cancel_incoming(); |
| } |
| |
| /* For outgoing */ |
| MigrationState *migrate_get_current(void) |
| { |
| /* This can only be called after the object created. */ |
| assert(current_migration); |
| return current_migration; |
| } |
| |
| MigrationIncomingState *migration_incoming_get_current(void) |
| { |
| assert(current_incoming); |
| return current_incoming; |
| } |
| |
| void migration_incoming_transport_cleanup(MigrationIncomingState *mis) |
| { |
| if (mis->socket_address_list) { |
| qapi_free_SocketAddressList(mis->socket_address_list); |
| mis->socket_address_list = NULL; |
| } |
| |
| if (mis->transport_cleanup) { |
| mis->transport_cleanup(mis->transport_data); |
| mis->transport_data = mis->transport_cleanup = NULL; |
| } |
| } |
| |
| void migration_incoming_state_destroy(void) |
| { |
| struct MigrationIncomingState *mis = migration_incoming_get_current(); |
| |
| if (mis->to_src_file) { |
| /* Tell source that we are done */ |
| migrate_send_rp_shut(mis, qemu_file_get_error(mis->from_src_file) != 0); |
| qemu_fclose(mis->to_src_file); |
| mis->to_src_file = NULL; |
| } |
| |
| if (mis->from_src_file) { |
| migration_ioc_unregister_yank_from_file(mis->from_src_file); |
| qemu_fclose(mis->from_src_file); |
| mis->from_src_file = NULL; |
| } |
| if (mis->postcopy_remote_fds) { |
| g_array_free(mis->postcopy_remote_fds, TRUE); |
| mis->postcopy_remote_fds = NULL; |
| } |
| |
| migration_incoming_transport_cleanup(mis); |
| qemu_event_reset(&mis->main_thread_load_event); |
| |
| if (mis->page_requested) { |
| g_tree_destroy(mis->page_requested); |
| mis->page_requested = NULL; |
| } |
| |
| if (mis->postcopy_qemufile_dst) { |
| migration_ioc_unregister_yank_from_file(mis->postcopy_qemufile_dst); |
| qemu_fclose(mis->postcopy_qemufile_dst); |
| mis->postcopy_qemufile_dst = NULL; |
| } |
| |
| yank_unregister_instance(MIGRATION_YANK_INSTANCE); |
| } |
| |
| static void migrate_generate_event(int new_state) |
| { |
| if (migrate_use_events()) { |
| qapi_event_send_migration(new_state); |
| } |
| } |
| |
| static bool migrate_late_block_activate(void) |
| { |
| MigrationState *s; |
| |
| s = migrate_get_current(); |
| |
| return s->enabled_capabilities[ |
| MIGRATION_CAPABILITY_LATE_BLOCK_ACTIVATE]; |
| } |
| |
| /* |
| * Send a message on the return channel back to the source |
| * of the migration. |
| */ |
| static int migrate_send_rp_message(MigrationIncomingState *mis, |
| enum mig_rp_message_type message_type, |
| uint16_t len, void *data) |
| { |
| int ret = 0; |
| |
| trace_migrate_send_rp_message((int)message_type, len); |
| QEMU_LOCK_GUARD(&mis->rp_mutex); |
| |
| /* |
| * It's possible that the file handle got lost due to network |
| * failures. |
| */ |
| if (!mis->to_src_file) { |
| ret = -EIO; |
| return ret; |
| } |
| |
| qemu_put_be16(mis->to_src_file, (unsigned int)message_type); |
| qemu_put_be16(mis->to_src_file, len); |
| qemu_put_buffer(mis->to_src_file, data, len); |
| qemu_fflush(mis->to_src_file); |
| |
| /* It's possible that qemu file got error during sending */ |
| ret = qemu_file_get_error(mis->to_src_file); |
| |
| return ret; |
| } |
| |
| /* Request one page from the source VM at the given start address. |
| * rb: the RAMBlock to request the page in |
| * Start: Address offset within the RB |
| * Len: Length in bytes required - must be a multiple of pagesize |
| */ |
| int migrate_send_rp_message_req_pages(MigrationIncomingState *mis, |
| RAMBlock *rb, ram_addr_t start) |
| { |
| uint8_t bufc[12 + 1 + 255]; /* start (8), len (4), rbname up to 256 */ |
| size_t msglen = 12; /* start + len */ |
| size_t len = qemu_ram_pagesize(rb); |
| enum mig_rp_message_type msg_type; |
| const char *rbname; |
| int rbname_len; |
| |
| *(uint64_t *)bufc = cpu_to_be64((uint64_t)start); |
| *(uint32_t *)(bufc + 8) = cpu_to_be32((uint32_t)len); |
| |
| /* |
| * We maintain the last ramblock that we requested for page. Note that we |
| * don't need locking because this function will only be called within the |
| * postcopy ram fault thread. |
| */ |
| if (rb != mis->last_rb) { |
| mis->last_rb = rb; |
| |
| rbname = qemu_ram_get_idstr(rb); |
| rbname_len = strlen(rbname); |
| |
| assert(rbname_len < 256); |
| |
| bufc[msglen++] = rbname_len; |
| memcpy(bufc + msglen, rbname, rbname_len); |
| msglen += rbname_len; |
| msg_type = MIG_RP_MSG_REQ_PAGES_ID; |
| } else { |
| msg_type = MIG_RP_MSG_REQ_PAGES; |
| } |
| |
| return migrate_send_rp_message(mis, msg_type, msglen, bufc); |
| } |
| |
| int migrate_send_rp_req_pages(MigrationIncomingState *mis, |
| RAMBlock *rb, ram_addr_t start, uint64_t haddr) |
| { |
| void *aligned = (void *)(uintptr_t)ROUND_DOWN(haddr, qemu_ram_pagesize(rb)); |
| bool received = false; |
| |
| WITH_QEMU_LOCK_GUARD(&mis->page_request_mutex) { |
| received = ramblock_recv_bitmap_test_byte_offset(rb, start); |
| if (!received && !g_tree_lookup(mis->page_requested, aligned)) { |
| /* |
| * The page has not been received, and it's not yet in the page |
| * request list. Queue it. Set the value of element to 1, so that |
| * things like g_tree_lookup() will return TRUE (1) when found. |
| */ |
| g_tree_insert(mis->page_requested, aligned, (gpointer)1); |
| mis->page_requested_count++; |
| trace_postcopy_page_req_add(aligned, mis->page_requested_count); |
| } |
| } |
| |
| /* |
| * If the page is there, skip sending the message. We don't even need the |
| * lock because as long as the page arrived, it'll be there forever. |
| */ |
| if (received) { |
| return 0; |
| } |
| |
| return migrate_send_rp_message_req_pages(mis, rb, start); |
| } |
| |
| static bool migration_colo_enabled; |
| bool migration_incoming_colo_enabled(void) |
| { |
| return migration_colo_enabled; |
| } |
| |
| void migration_incoming_disable_colo(void) |
| { |
| ram_block_discard_disable(false); |
| migration_colo_enabled = false; |
| } |
| |
| int migration_incoming_enable_colo(void) |
| { |
| if (ram_block_discard_disable(true)) { |
| error_report("COLO: cannot disable RAM discard"); |
| return -EBUSY; |
| } |
| migration_colo_enabled = true; |
| return 0; |
| } |
| |
| void migrate_add_address(SocketAddress *address) |
| { |
| MigrationIncomingState *mis = migration_incoming_get_current(); |
| |
| QAPI_LIST_PREPEND(mis->socket_address_list, |
| QAPI_CLONE(SocketAddress, address)); |
| } |
| |
| static void qemu_start_incoming_migration(const char *uri, Error **errp) |
| { |
| const char *p = NULL; |
| |
| migrate_protocol_allow_multi_channels(false); /* reset it anyway */ |
| qapi_event_send_migration(MIGRATION_STATUS_SETUP); |
| if (strstart(uri, "tcp:", &p) || |
| strstart(uri, "unix:", NULL) || |
| strstart(uri, "vsock:", NULL)) { |
| migrate_protocol_allow_multi_channels(true); |
| socket_start_incoming_migration(p ? p : uri, errp); |
| #ifdef CONFIG_RDMA |
| } else if (strstart(uri, "rdma:", &p)) { |
| rdma_start_incoming_migration(p, errp); |
| #endif |
| } else if (strstart(uri, "exec:", &p)) { |
| exec_start_incoming_migration(p, errp); |
| } else if (strstart(uri, "fd:", &p)) { |
| fd_start_incoming_migration(p, errp); |
| } else { |
| error_setg(errp, "unknown migration protocol: %s", uri); |
| } |
| } |
| |
| static void process_incoming_migration_bh(void *opaque) |
| { |
| Error *local_err = NULL; |
| MigrationIncomingState *mis = opaque; |
| |
| /* If capability late_block_activate is set: |
| * Only fire up the block code now if we're going to restart the |
| * VM, else 'cont' will do it. |
| * This causes file locking to happen; so we don't want it to happen |
| * unless we really are starting the VM. |
| */ |
| if (!migrate_late_block_activate() || |
| (autostart && (!global_state_received() || |
| global_state_get_runstate() == RUN_STATE_RUNNING))) { |
| /* Make sure all file formats throw away their mutable metadata. |
| * If we get an error here, just don't restart the VM yet. */ |
| bdrv_activate_all(&local_err); |
| if (local_err) { |
| error_report_err(local_err); |
| local_err = NULL; |
| autostart = false; |
| } |
| } |
| |
| /* |
| * This must happen after all error conditions are dealt with and |
| * we're sure the VM is going to be running on this host. |
| */ |
| qemu_announce_self(&mis->announce_timer, migrate_announce_params()); |
| |
| if (multifd_load_cleanup(&local_err) != 0) { |
| error_report_err(local_err); |
| autostart = false; |
| } |
| /* If global state section was not received or we are in running |
| state, we need to obey autostart. Any other state is set with |
| runstate_set. */ |
| |
| dirty_bitmap_mig_before_vm_start(); |
| |
| if (!global_state_received() || |
| global_state_get_runstate() == RUN_STATE_RUNNING) { |
| if (autostart) { |
| vm_start(); |
| } else { |
| runstate_set(RUN_STATE_PAUSED); |
| } |
| } else if (migration_incoming_colo_enabled()) { |
| migration_incoming_disable_colo(); |
| vm_start(); |
| } else { |
| runstate_set(global_state_get_runstate()); |
| } |
| /* |
| * This must happen after any state changes since as soon as an external |
| * observer sees this event they might start to prod at the VM assuming |
| * it's ready to use. |
| */ |
| migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE, |
| MIGRATION_STATUS_COMPLETED); |
| qemu_bh_delete(mis->bh); |
| migration_incoming_state_destroy(); |
| } |
| |
| static void process_incoming_migration_co(void *opaque) |
| { |
| MigrationIncomingState *mis = migration_incoming_get_current(); |
| PostcopyState ps; |
| int ret; |
| Error *local_err = NULL; |
| |
| assert(mis->from_src_file); |
| mis->migration_incoming_co = qemu_coroutine_self(); |
| mis->largest_page_size = qemu_ram_pagesize_largest(); |
| postcopy_state_set(POSTCOPY_INCOMING_NONE); |
| migrate_set_state(&mis->state, MIGRATION_STATUS_NONE, |
| MIGRATION_STATUS_ACTIVE); |
| ret = qemu_loadvm_state(mis->from_src_file); |
| |
| ps = postcopy_state_get(); |
| trace_process_incoming_migration_co_end(ret, ps); |
| if (ps != POSTCOPY_INCOMING_NONE) { |
| if (ps == POSTCOPY_INCOMING_ADVISE) { |
| /* |
| * Where a migration had postcopy enabled (and thus went to advise) |
| * but managed to complete within the precopy period, we can use |
| * the normal exit. |
| */ |
| postcopy_ram_incoming_cleanup(mis); |
| } else if (ret >= 0) { |
| /* |
| * Postcopy was started, cleanup should happen at the end of the |
| * postcopy thread. |
| */ |
| trace_process_incoming_migration_co_postcopy_end_main(); |
| return; |
| } |
| /* Else if something went wrong then just fall out of the normal exit */ |
| } |
| |
| /* we get COLO info, and know if we are in COLO mode */ |
| if (!ret && migration_incoming_colo_enabled()) { |
| /* Make sure all file formats throw away their mutable metadata */ |
| bdrv_activate_all(&local_err); |
| if (local_err) { |
| error_report_err(local_err); |
| goto fail; |
| } |
| |
| 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(); |
| |
| qemu_mutex_unlock_iothread(); |
| /* Wait checkpoint incoming thread exit before free resource */ |
| qemu_thread_join(&mis->colo_incoming_thread); |
| qemu_mutex_lock_iothread(); |
| /* 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); |
| } |
| |
| /** |
| * migration_incoming_setup: Setup incoming migration |
| * @f: file for main migration channel |
| * @errp: where to put errors |
| * |
| * Returns: %true on success, %false on error. |
| */ |
| static bool migration_incoming_setup(QEMUFile *f, Error **errp) |
| { |
| MigrationIncomingState *mis = migration_incoming_get_current(); |
| |
| if (multifd_load_setup(errp) != 0) { |
| return false; |
| } |
| |
| if (!mis->from_src_file) { |
| mis->from_src_file = f; |
| } |
| qemu_file_set_blocking(f, false); |
| return true; |
| } |
| |
| 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(void) |
| { |
| MigrationIncomingState *mis = migration_incoming_get_current(); |
| |
| if (mis->state == MIGRATION_STATUS_POSTCOPY_PAUSED) { |
| /* Resumed from a paused postcopy migration */ |
| |
| /* This should be set already in migration_incoming_setup() */ |
| assert(mis->from_src_file); |
| /* Postcopy has standalone thread to do vm load */ |
| qemu_file_set_blocking(mis->from_src_file, true); |
| |
| /* Re-configure the return path */ |
| mis->to_src_file = qemu_file_get_return_path(mis->from_src_file); |
| |
| migrate_set_state(&mis->state, MIGRATION_STATUS_POSTCOPY_PAUSED, |
| MIGRATION_STATUS_POSTCOPY_RECOVER); |
| |
| /* |
| * Here, we only wake up the main loading thread (while the |
| * rest threads will still be waiting), so that we can receive |
| * commands from source now, and answer it if needed. The |
| * rest threads 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, Error **errp) |
| { |
| if (!migration_incoming_setup(f, errp)) { |
| return; |
| } |
| if (postcopy_try_recover()) { |
| return; |
| } |
| migration_incoming_process(); |
| } |
| |
| static bool migration_needs_multiple_sockets(void) |
| { |
| return migrate_use_multifd() || migrate_postcopy_preempt(); |
| } |
| |
| void migration_ioc_process_incoming(QIOChannel *ioc, Error **errp) |
| { |
| MigrationIncomingState *mis = migration_incoming_get_current(); |
| Error *local_err = NULL; |
| bool start_migration; |
| QEMUFile *f; |
| |
| if (!mis->from_src_file) { |
| /* The first connection (multifd may have multiple) */ |
| f = qemu_file_new_input(ioc); |
| |
| if (!migration_incoming_setup(f, errp)) { |
| return; |
| } |
| |
| /* |
| * Common migration only needs one channel, so we can start |
| * right now. Some features need more than one channel, we wait. |
| */ |
| start_migration = !migration_needs_multiple_sockets(); |
| } else { |
| /* Multiple connections */ |
| assert(migration_needs_multiple_sockets()); |
| if (migrate_use_multifd()) { |
| start_migration = multifd_recv_new_channel(ioc, &local_err); |
| } else { |
| assert(migrate_postcopy_preempt()); |
| f = qemu_file_new_input(ioc); |
| start_migration = postcopy_preempt_new_channel(mis, f); |
| } |
| if (local_err) { |
| error_propagate(errp, local_err); |
| return; |
| } |
| } |
| |
| if (start_migration) { |
| /* If it's a recovery, we're done */ |
| if (postcopy_try_recover()) { |
| return; |
| } |
| 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(); |
| |
| if (!mis->from_src_file) { |
| return false; |
| } |
| |
| if (migrate_use_multifd()) { |
| return multifd_recv_all_channels_created(); |
| } |
| |
| if (migrate_postcopy_preempt()) { |
| return mis->postcopy_qemufile_dst != NULL; |
| } |
| |
| return true; |
| } |
| |
| /* |
| * 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, **tail = &head; |
| MigrationCapabilityStatus *caps; |
| MigrationState *s = migrate_get_current(); |
| int i; |
| |
| for (i = 0; i < MIGRATION_CAPABILITY__MAX; i++) { |
| #ifndef CONFIG_LIVE_BLOCK_MIGRATION |
| if (i == MIGRATION_CAPABILITY_BLOCK) { |
| continue; |
| } |
| #endif |
| caps = g_malloc0(sizeof(*caps)); |
| caps->capability = i; |
| caps->state = s->enabled_capabilities[i]; |
| QAPI_LIST_APPEND(tail, caps); |
| } |
| |
| 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_throttle_trigger_threshold = true; |
| params->throttle_trigger_threshold = s->parameters.throttle_trigger_threshold; |
| 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_cpu_throttle_tailslow = true; |
| params->cpu_throttle_tailslow = s->parameters.cpu_throttle_tailslow; |
| 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 ? |
| 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_multifd_compression = true; |
| params->multifd_compression = s->parameters.multifd_compression; |
| params->has_multifd_zlib_level = true; |
| params->multifd_zlib_level = s->parameters.multifd_zlib_level; |
| params->has_multifd_zstd_level = true; |
| params->multifd_zstd_level = s->parameters.multifd_zstd_level; |
| 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; |
| |
| if (s->parameters.has_block_bitmap_mapping) { |
| params->has_block_bitmap_mapping = true; |
| params->block_bitmap_mapping = |
| QAPI_CLONE(BitmapMigrationNodeAliasList, |
| s->parameters.block_bitmap_mapping); |
| } |
| |
| 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: |
| case MIGRATION_STATUS_COLO: |
| return true; |
| |
| default: |
| return false; |
| |
| } |
| } |
| |
| bool migration_is_running(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: |
| case MIGRATION_STATUS_CANCELLING: |
| 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) |
| { |
| size_t page_size = qemu_target_page_size(); |
| |
| 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 * page_size; |
| info->ram->mbps = s->mbps; |
| info->ram->dirty_sync_count = ram_counters.dirty_sync_count; |
| info->ram->dirty_sync_missed_zero_copy = |
| ram_counters.dirty_sync_missed_zero_copy; |
| info->ram->postcopy_requests = ram_counters.postcopy_requests; |
| info->ram->page_size = page_size; |
| info->ram->multifd_bytes = ram_counters.multifd_bytes; |
| info->ram->pages_per_second = s->pages_per_second; |
| info->ram->precopy_bytes = ram_counters.precopy_bytes; |
| info->ram->downtime_bytes = ram_counters.downtime_bytes; |
| info->ram->postcopy_bytes = ram_counters.postcopy_bytes; |
| |
| 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->encoding_rate = xbzrle_counters.encoding_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(); |
| int state = qatomic_read(&s->state); |
| GSList *cur_blocker = migration_blockers; |
| |
| info->blocked_reasons = NULL; |
| |
| /* |
| * There are two types of reasons a migration might be blocked; |
| * a) devices marked in VMState as non-migratable, and |
| * b) Explicit migration blockers |
| * We need to add both of them here. |
| */ |
| qemu_savevm_non_migratable_list(&info->blocked_reasons); |
| |
| while (cur_blocker) { |
| QAPI_LIST_PREPEND(info->blocked_reasons, |
| g_strdup(error_get_pretty(cur_blocker->data))); |
| cur_blocker = g_slist_next(cur_blocker); |
| } |
| info->has_blocked_reasons = info->blocked_reasons != NULL; |
| |
| switch (state) { |
| case MIGRATION_STATUS_NONE: |
| /* no migration has happened ever */ |
| /* do not overwrite destination migration status */ |
| return; |
| 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); |
| populate_vfio_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); |
| populate_vfio_info(info); |
| 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 = state; |
| } |
| |
| typedef enum WriteTrackingSupport { |
| WT_SUPPORT_UNKNOWN = 0, |
| WT_SUPPORT_ABSENT, |
| WT_SUPPORT_AVAILABLE, |
| WT_SUPPORT_COMPATIBLE |
| } WriteTrackingSupport; |
| |
| static |
| WriteTrackingSupport migrate_query_write_tracking(void) |
| { |
| /* Check if kernel supports required UFFD features */ |
| if (!ram_write_tracking_available()) { |
| return WT_SUPPORT_ABSENT; |
| } |
| /* |
| * Check if current memory configuration is |
| * compatible with required UFFD features. |
| */ |
| if (!ram_write_tracking_compatible()) { |
| return WT_SUPPORT_AVAILABLE; |
| } |
| |
| return WT_SUPPORT_COMPATIBLE; |
| } |
| |
| /** |
| * @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]) { |
| /* 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; |
| } |
| } |
| |
| if (cap_list[MIGRATION_CAPABILITY_BACKGROUND_SNAPSHOT]) { |
| WriteTrackingSupport wt_support; |
| int idx; |
| /* |
| * Check if 'background-snapshot' capability is supported by |
| * host kernel and compatible with guest memory configuration. |
| */ |
| wt_support = migrate_query_write_tracking(); |
| if (wt_support < WT_SUPPORT_AVAILABLE) { |
| error_setg(errp, "Background-snapshot is not supported by host kernel"); |
| return false; |
| } |
| if (wt_support < WT_SUPPORT_COMPATIBLE) { |
| error_setg(errp, "Background-snapshot is not compatible " |
| "with guest memory configuration"); |
| return false; |
| } |
| |
| /* |
| * Check if there are any migration capabilities |
| * incompatible with 'background-snapshot'. |
| */ |
| for (idx = 0; idx < check_caps_background_snapshot.size; idx++) { |
| int incomp_cap = check_caps_background_snapshot.caps[idx]; |
| if (cap_list[incomp_cap]) { |
| error_setg(errp, |
| "Background-snapshot is not compatible with %s", |
| MigrationCapability_str(incomp_cap)); |
| return false; |
| } |
| } |
| } |
| |
| #ifdef CONFIG_LINUX |
| if (cap_list[MIGRATION_CAPABILITY_ZERO_COPY_SEND] && |
| (!cap_list[MIGRATION_CAPABILITY_MULTIFD] || |
| cap_list[MIGRATION_CAPABILITY_COMPRESS] || |
| cap_list[MIGRATION_CAPABILITY_XBZRLE] || |
| migrate_multifd_compression() || |
| migrate_use_tls())) { |
| error_setg(errp, |
| "Zero copy only available for non-compressed non-TLS multifd migration"); |
| return false; |
| } |
| #else |
| if (cap_list[MIGRATION_CAPABILITY_ZERO_COPY_SEND]) { |
| error_setg(errp, |
| "Zero copy currently only available on Linux"); |
| return false; |
| } |
| #endif |
| |
| |
| /* incoming side only */ |
| if (runstate_check(RUN_STATE_INMIGRATE) && |
| !migrate_multi_channels_is_allowed() && |
| cap_list[MIGRATION_CAPABILITY_MULTIFD]) { |
| error_setg(errp, "multifd is not supported by current protocol"); |
| return false; |
| } |
| |
| if (cap_list[MIGRATION_CAPABILITY_POSTCOPY_PREEMPT]) { |
| if (!cap_list[MIGRATION_CAPABILITY_POSTCOPY_RAM]) { |
| error_setg(errp, "Postcopy preempt requires postcopy-ram"); |
| 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; |
| 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_running(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", |
| "a value between 0 and 9"); |
| return false; |
| } |
| |
| if (params->has_compress_threads && (params->compress_threads < 1)) { |
| error_setg(errp, QERR_INVALID_PARAMETER_VALUE, |
| "compress_threads", |
| "a value between 1 and 255"); |
| return false; |
| } |
| |
| if (params->has_decompress_threads && (params->decompress_threads < 1)) { |
| error_setg(errp, QERR_INVALID_PARAMETER_VALUE, |
| "decompress_threads", |
| "a value between 1 and 255"); |
| return false; |
| } |
| |
| if (params->has_throttle_trigger_threshold && |
| (params->throttle_trigger_threshold < 1 || |
| params->throttle_trigger_threshold > 100)) { |
| error_setg(errp, QERR_INVALID_PARAMETER_VALUE, |
| "throttle_trigger_threshold", |
| "an integer in the range of 1 to 100"); |
| 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, QERR_INVALID_PARAMETER_VALUE, |
| "max_bandwidth", |
| "an integer in the range of 0 to "stringify(SIZE_MAX) |
| " bytes/second"); |
| return false; |
| } |
| |
| if (params->has_downtime_limit && |
| (params->downtime_limit > MAX_MIGRATE_DOWNTIME)) { |
| error_setg(errp, QERR_INVALID_PARAMETER_VALUE, |
| "downtime_limit", |
| "an integer in the range of 0 to " |
| stringify(MAX_MIGRATE_DOWNTIME)" ms"); |
| 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", |
| "a value between 1 and 255"); |
| return false; |
| } |
| |
| if (params->has_multifd_zlib_level && |
| (params->multifd_zlib_level > 9)) { |
| error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "multifd_zlib_level", |
| "a value between 0 and 9"); |
| return false; |
| } |
| |
| if (params->has_multifd_zstd_level && |
| (params->multifd_zstd_level > 20)) { |
| error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "multifd_zstd_level", |
| "a value between 0 and 20"); |
| 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", |
| "a power of two no less than the target page size"); |
| 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", |
| "a value between 0 and 100000"); |
| return false; |
| } |
| if (params->has_announce_max && |
| params->announce_max > 100000) { |
| error_setg(errp, QERR_INVALID_PARAMETER_VALUE, |
| "announce_max", |
| "a value between 0 and 100000"); |
| return false; |
| } |
| if (params->has_announce_rounds && |
| params->announce_rounds > 1000) { |
| error_setg(errp, QERR_INVALID_PARAMETER_VALUE, |
| "announce_rounds", |
| "a value between 0 and 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", |
| "a value between 0 and 10000"); |
| return false; |
| } |
| |
| if (params->has_block_bitmap_mapping && |
| !check_dirty_bitmap_mig_alias_map(params->block_bitmap_mapping, errp)) { |
| error_prepend(errp, "Invalid mapping given for block-bitmap-mapping: "); |
| return false; |
| } |
| |
| #ifdef CONFIG_LINUX |
| if (migrate_use_zero_copy_send() && |
| ((params->has_multifd_compression && params->multifd_compression) || |
| (params->has_tls_creds && params->tls_creds && *params->tls_creds))) { |
| error_setg(errp, |
| "Zero copy only available for non-compressed non-TLS multifd migration"); |
| return false; |
| } |
| #endif |
| |
| 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_throttle_trigger_threshold) { |
| dest->throttle_trigger_threshold = params->throttle_trigger_threshold; |
| } |
| |
| 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_cpu_throttle_tailslow) { |
| dest->cpu_throttle_tailslow = params->cpu_throttle_tailslow; |
| } |
| |
| if (params->has_tls_creds) { |
| assert(params->tls_creds->type == QTYPE_QSTRING); |
| dest->tls_creds = params->tls_creds->u.s; |
| } |
| |
| if (params->has_tls_hostname) { |
| assert(params->tls_hostname->type == QTYPE_QSTRING); |
| dest->tls_hostname = 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_multifd_compression) { |
| dest->multifd_compression = params->multifd_compression; |
| } |
| 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; |
| } |
| |
| if (params->has_block_bitmap_mapping) { |
| dest->has_block_bitmap_mapping = true; |
| dest->block_bitmap_mapping = params->block_bitmap_mapping; |
| } |
| } |
| |
| 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_throttle_trigger_threshold) { |
| s->parameters.throttle_trigger_threshold = params->throttle_trigger_threshold; |
| } |
| |
| 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_cpu_throttle_tailslow) { |
| s->parameters.cpu_throttle_tailslow = params->cpu_throttle_tailslow; |
| } |
| |
| 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_multifd_compression) { |
| s->parameters.multifd_compression = params->multifd_compression; |
| } |
| 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; |
| } |
| |
| if (params->has_block_bitmap_mapping) { |
| qapi_free_BitmapMigrationNodeAliasList( |
| s->parameters.block_bitmap_mapping); |
| |
| s->parameters.has_block_bitmap_mapping = true; |
| s->parameters.block_bitmap_mapping = |
| QAPI_CLONE(BitmapMigrationNodeAliasList, |
| params->block_bitmap_mapping); |
| } |
| } |
| |
| 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. |
| */ |
| qatomic_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 (qatomic_cmpxchg(state, old_state, new_state) == old_state) { |
| trace_migrate_set_state(MigrationStatus_str(new_state)); |
| migrate_generate_event(new_state); |
| } |
| } |
| |
| static MigrationCapabilityStatus *migrate_cap_add(MigrationCapability index, |
| bool state) |
| { |
| MigrationCapabilityStatus *cap; |
| |
| cap = g_new0(MigrationCapabilityStatus, 1); |
| cap->capability = index; |
| cap->state = state; |
| |
| return cap; |
| } |
| |
| void migrate_set_block_enabled(bool value, Error **errp) |
| { |
| MigrationCapabilityStatusList *cap = NULL; |
| |
| QAPI_LIST_PREPEND(cap, migrate_cap_add(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; |
| |
| g_free(s->hostname); |
| s->hostname = 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. |
| */ |
| migration_ioc_unregister_yank_from_file(tmp); |
| qemu_fclose(tmp); |
| } |
| |
| if (s->postcopy_qemufile_src) { |
| migration_ioc_unregister_yank_from_file(s->postcopy_qemufile_src); |
| qemu_fclose(s->postcopy_qemufile_src); |
| s->postcopy_qemufile_src = NULL; |
| } |
| |
| 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); |
| yank_unregister_instance(MIGRATION_YANK_INSTANCE); |
| } |
| |
| 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_LOCK_GUARD(&s->error_mutex); |
| if (!s->error) { |
| s->error = error_copy(error); |
| } |
| } |
| |
| static void migrate_error_free(MigrationState *s) |
| { |
| QEMU_LOCK_GUARD(&s->error_mutex); |
| if (s->error) { |
| error_free(s->error); |
| s->error = NULL; |
| } |
| } |
| |
| 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(); |
| |
| WITH_QEMU_LOCK_GUARD(&s->qemu_file_lock) { |
| 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_running(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_activate_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_in_incoming_postcopy(void) |
| { |
| PostcopyState ps = postcopy_state_get(); |
| |
| return ps >= POSTCOPY_INCOMING_DISCARD && ps < POSTCOPY_INCOMING_END; |
| } |
| |
| bool migration_in_bg_snapshot(void) |
| { |
| MigrationState *s = migrate_get_current(); |
| |
| return migrate_background_snapshot() && |
| migration_is_setup_or_active(s->state); |
| } |
| |
| 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->vm_start_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; |
| s->hostname = 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; |
| } |
| |
| int migrate_add_blocker_internal(Error *reason, Error **errp) |
| { |
| /* Snapshots are similar to migrations, so check RUN_STATE_SAVE_VM too. */ |
| if (runstate_check(RUN_STATE_SAVE_VM) || !migration_is_idle()) { |
| error_propagate_prepend(errp, error_copy(reason), |
| "disallowing migration blocker " |
| "(migration/snapshot in progress) for: "); |
| return -EBUSY; |
| } |
| |
| migration_blockers = g_slist_prepend(migration_blockers, reason); |
| return 0; |
| } |
| |
| 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; |
| } |
| |
| return migrate_add_blocker_internal(reason, errp); |
| } |
| |
| 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 (!once) { |
| error_setg(errp, "The incoming migration has already been started"); |
| return; |
| } |
| if (!runstate_check(RUN_STATE_INMIGRATE)) { |
| error_setg(errp, "'-incoming' was not specified on the command line"); |
| return; |
| } |
| |
| if (!yank_register_instance(MIGRATION_YANK_INSTANCE, errp)) { |
| return; |
| } |
| |
| qemu_start_incoming_migration(uri, &local_err); |
| |
| if (local_err) { |
| yank_unregister_instance(MIGRATION_YANK_INSTANCE); |
| error_propagate(errp, local_err); |
| return; |
| } |
| |
| once = false; |
| } |
| |
| void qmp_migrate_recover(const char *uri, Error **errp) |
| { |
| MigrationIncomingState *mis = migration_incoming_get_current(); |
| |
| /* |
| * Don't even bother to use ERRP_GUARD() as it _must_ always be set by |
| * callers (no one should ignore a recover failure); if there is, it's a |
| * programming error. |
| */ |
| assert(errp); |
| |
| if (mis->state != MIGRATION_STATUS_POSTCOPY_PAUSED) { |
| error_setg(errp, "Migrate recover can only be run " |
| "when postcopy is paused."); |
| return; |
| } |
| |
| /* If there's an existing transport, release it */ |
| migration_incoming_transport_cleanup(mis); |
| |
| /* |
| * 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_running(s->state)) { |
| 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 (runstate_check(RUN_STATE_POSTMIGRATE)) { |
| error_setg(errp, "Can't migrate the vm that was paused due to " |
| "previous migration"); |
| return false; |
| } |
| |
| if (migration_is_blocked(errp)) { |
| return false; |
| } |
| |
| if (blk || blk_inc) { |
| if (migrate_colo_enabled()) { |
| error_setg(errp, "No disk migration is required in COLO mode"); |
| return false; |
| } |
| 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 compression_counters memory to zero for a |
| * new migration |
| */ |
| memset(&ram_counters, 0, sizeof(ram_counters)); |
| memset(&compression_counters, 0, sizeof(compression_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 = NULL; |
| |
| if (!migrate_prepare(s, has_blk && blk, has_inc && inc, |
| has_resume && resume, errp)) { |
| /* Error detected, put into errp */ |
| return; |
| } |
| |
| if (!(has_resume && resume)) { |
| if (!yank_register_instance(MIGRATION_YANK_INSTANCE, errp)) { |
| return; |
| } |
| } |
| |
| migrate_protocol_allow_multi_channels(false); |
| if (strstart(uri, "tcp:", &p) || |
| strstart(uri, "unix:", NULL) || |
| strstart(uri, "vsock:", NULL)) { |
| migrate_protocol_allow_multi_channels(true); |
| socket_start_outgoing_migration(s, p ? p : uri, &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, "fd:", &p)) { |
| fd_start_outgoing_migration(s, p, &local_err); |
| } else { |
| if (!(has_resume && resume)) { |
| yank_unregister_instance(MIGRATION_YANK_INSTANCE); |
| } |
| 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) { |
| if (!(has_resume && resume)) { |
| yank_unregister_instance(MIGRATION_YANK_INSTANCE); |
| } |
| migrate_fd_error(s, local_err); |
| error_propagate(errp, local_err); |
| return; |
| } |
| } |
| |
| void qmp_migrate_cancel(Error **errp) |
| { |
| migration_cancel(NULL); |
| } |
| |
| 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); |
| } |
| |
| 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; |
| } |
| |
| MultiFDCompression migrate_multifd_compression(void) |
| { |
| MigrationState *s; |
| |
| s = migrate_get_current(); |
| |
| assert(s->parameters.multifd_compression < MULTIFD_COMPRESSION__MAX); |
| return s->parameters.multifd_compression; |
| } |
| |
| int migrate_multifd_zlib_level(void) |
| { |
| MigrationState *s; |
| |
| s = migrate_get_current(); |
| |
| return s->parameters.multifd_zlib_level; |
| } |
| |
| int migrate_multifd_zstd_level(void) |
| { |
| MigrationState *s; |
| |
| s = migrate_get_current(); |
| |
| return s->parameters.multifd_zstd_level; |
| } |
| |
| #ifdef CONFIG_LINUX |
| bool migrate_use_zero_copy_send(void) |
| { |
| MigrationState *s; |
| |
| s = migrate_get_current(); |
| |
| return s->enabled_capabilities[MIGRATION_CAPABILITY_ZERO_COPY_SEND]; |
| } |
| #endif |
| |
| int migrate_use_tls(void) |
| { |
| MigrationState *s; |
| |
| s = migrate_get_current(); |
| |
| return s->parameters.tls_creds && *s->parameters.tls_creds; |
| } |
| |
| int migrate_use_xbzrle(void) |
| { |
| MigrationState *s; |
| |
| s = migrate_get_current(); |
| |
| return s->enabled_capabilities[MIGRATION_CAPABILITY_XBZRLE]; |
| } |
| |
| uint64_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; |
| } |
| |
| bool migrate_background_snapshot(void) |
| { |
| MigrationState *s; |
| |
| s = migrate_get_current(); |
| |
| return s->enabled_capabilities[MIGRATION_CAPABILITY_BACKGROUND_SNAPSHOT]; |
| } |
| |
| bool migrate_postcopy_preempt(void) |
| { |
| MigrationState *s; |
| |
| s = migrate_get_current(); |
| |
| return s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_PREEMPT]; |
| } |
| |
| /* 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 (!QEMU_IS_ALIGNED(start, our_host_ps) || |
| !QEMU_IS_ALIGNED(len, our_host_ps)) { |
| 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; |
| } |
| |
| /* Release ms->rp_state.from_dst_file in a safe way */ |
| static void migration_release_from_dst_file(MigrationState *ms) |
| { |
| QEMUFile *file; |
| |
| WITH_QEMU_LOCK_GUARD(&ms->qemu_file_lock) { |
| /* |
| * Reset the from_dst_file pointer first before releasing it, as we |
| * can't block within lock section |
| */ |
| file = ms->rp_state.from_dst_file; |
| ms->rp_state.from_dst_file = NULL; |
| } |
| |
| qemu_fclose(file); |
| } |
| |
| /* |
| * 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 && migration_in_postcopy()) { |
| /* |
| * Maybe there is something we can do: it looks like a |
| * network down issue, and we pause for a recovery. |
| */ |
| migration_release_from_dst_file(ms); |
| rp = NULL; |
| if (postcopy_pause_return_path_thread(ms)) { |
| /* |
| * Reload rp, reset the rest. Referencing it is safe since |
| * it's reset only by us above, or when migration completes |
| */ |
| 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(); |
| migration_release_from_dst_file(ms); |
| 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); |
| ms->rp_state.rp_thread_created = true; |
| |
| 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); |
| ms->rp_state.rp_thread_created = false; |
| 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 (postcopy_preempt_wait_channel(ms)) { |
| migrate_set_state(&ms->state, ms->state, MIGRATION_STATUS_FAILED); |
| return -1; |
| } |
| |
| 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()) { |
| ram_postcopy_send_discard_bitmap(ms); |
| } |
| |
| /* |
| * 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_file_new_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); |
| |
| |