--- /dev/null
+/*
+ * 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-common.h"
+#include "qemu/error-report.h"
+#include "qemu/main-loop.h"
+#include "migration/migration.h"
+#include "migration/qemu-file.h"
+#include "sysemu/sysemu.h"
+#include "block/block.h"
+#include "qapi/qmp/qerror.h"
+#include "qemu/sockets.h"
+#include "qemu/rcu.h"
+#include "migration/block.h"
+#include "qemu/thread.h"
+#include "qmp-commands.h"
+#include "trace.h"
+#include "qapi/util.h"
+#include "qapi-event.h"
+
+#define MAX_THROTTLE (32 << 20) /* Migration 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)
+
+/* 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
+
+/* Migration XBZRLE default cache size */
+#define DEFAULT_MIGRATE_CACHE_SIZE (64 * 1024 * 1024)
+
+static NotifierList migration_state_notifiers =
+ NOTIFIER_LIST_INITIALIZER(migration_state_notifiers);
+
+static bool deferred_incoming;
+
+/* When we add fault tolerance, we could have several
+ migrations at once. For now we don't need to add
+ dynamic creation of migration */
+
+/* For outgoing */
+MigrationState *migrate_get_current(void)
+{
+ static MigrationState current_migration = {
+ .state = MIGRATION_STATUS_NONE,
+ .bandwidth_limit = MAX_THROTTLE,
+ .xbzrle_cache_size = DEFAULT_MIGRATE_CACHE_SIZE,
+ .mbps = -1,
+ .parameters[MIGRATION_PARAMETER_COMPRESS_LEVEL] =
+ DEFAULT_MIGRATE_COMPRESS_LEVEL,
+ .parameters[MIGRATION_PARAMETER_COMPRESS_THREADS] =
+ DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT,
+ .parameters[MIGRATION_PARAMETER_DECOMPRESS_THREADS] =
+ DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT,
+ };
+
+ return ¤t_migration;
+}
+
+/* For incoming */
+static MigrationIncomingState *mis_current;
+
+MigrationIncomingState *migration_incoming_get_current(void)
+{
+ return mis_current;
+}
+
+MigrationIncomingState *migration_incoming_state_new(QEMUFile* f)
+{
+ mis_current = g_malloc0(sizeof(MigrationIncomingState));
+ mis_current->file = f;
+ QLIST_INIT(&mis_current->loadvm_handlers);
+
+ return mis_current;
+}
+
+void migration_incoming_state_destroy(void)
+{
+ loadvm_free_handlers(mis_current);
+ g_free(mis_current);
+ mis_current = NULL;
+}
+
+
+typedef struct {
+ bool optional;
+ uint32_t size;
+ uint8_t runstate[100];
+ RunState state;
+ bool received;
+} GlobalState;
+
+static GlobalState global_state;
+
+int global_state_store(void)
+{
+ if (!runstate_store((char *)global_state.runstate,
+ sizeof(global_state.runstate))) {
+ error_report("runstate name too big: %s", global_state.runstate);
+ trace_migrate_state_too_big();
+ return -EINVAL;
+ }
+ return 0;
+}
+
+void global_state_store_running(void)
+{
+ const char *state = RunState_lookup[RUN_STATE_RUNNING];
+ strncpy((char *)global_state.runstate,
+ state, sizeof(global_state.runstate));
+}
+
+static bool global_state_received(void)
+{
+ return global_state.received;
+}
+
+static RunState global_state_get_runstate(void)
+{
+ return global_state.state;
+}
+
+void global_state_set_optional(void)
+{
+ global_state.optional = true;
+}
+
+static bool global_state_needed(void *opaque)
+{
+ GlobalState *s = opaque;
+ char *runstate = (char *)s->runstate;
+
+ /* If it is not optional, it is mandatory */
+
+ if (s->optional == false) {
+ return true;
+ }
+
+ /* If state is running or paused, it is not needed */
+
+ if (strcmp(runstate, "running") == 0 ||
+ strcmp(runstate, "paused") == 0) {
+ return false;
+ }
+
+ /* for any other state it is needed */
+ return true;
+}
+
+static int global_state_post_load(void *opaque, int version_id)
+{
+ GlobalState *s = opaque;
+ Error *local_err = NULL;
+ int r;
+ char *runstate = (char *)s->runstate;
+
+ s->received = true;
+ trace_migrate_global_state_post_load(runstate);
+
+ r = qapi_enum_parse(RunState_lookup, runstate, RUN_STATE_MAX,
+ -1, &local_err);
+
+ if (r == -1) {
+ if (local_err) {
+ error_report_err(local_err);
+ }
+ return -EINVAL;
+ }
+ s->state = r;
+
+ return 0;
+}
+
+static void global_state_pre_save(void *opaque)
+{
+ GlobalState *s = opaque;
+
+ trace_migrate_global_state_pre_save((char *)s->runstate);
+ s->size = strlen((char *)s->runstate) + 1;
+}
+
+static const VMStateDescription vmstate_globalstate = {
+ .name = "globalstate",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .post_load = global_state_post_load,
+ .pre_save = global_state_pre_save,
+ .needed = global_state_needed,
+ .fields = (VMStateField[]) {
+ VMSTATE_UINT32(size, GlobalState),
+ VMSTATE_BUFFER(runstate, GlobalState),
+ VMSTATE_END_OF_LIST()
+ },
+};
+
+void register_global_state(void)
+{
+ /* We would use it independently that we receive it */
+ strcpy((char *)&global_state.runstate, "");
+ global_state.received = false;
+ vmstate_register(NULL, 0, &vmstate_globalstate, &global_state);
+}
+
+static void migrate_generate_event(int new_state)
+{
+ if (migrate_use_events()) {
+ qapi_event_send_migration(new_state, &error_abort);
+ }
+}
+
+/*
+ * Called on -incoming with a defer: uri.
+ * The migration can be started later after any parameters have been
+ * changed.
+ */
+static void deferred_incoming_migration(Error **errp)
+{
+ if (deferred_incoming) {
+ error_setg(errp, "Incoming migration already deferred");
+ }
+ deferred_incoming = true;
+}
+
+void qemu_start_incoming_migration(const char *uri, Error **errp)
+{
+ const char *p;
+
+ qapi_event_send_migration(MIGRATION_STATUS_SETUP, &error_abort);
+ if (!strcmp(uri, "defer")) {
+ deferred_incoming_migration(errp);
+ } else if (strstart(uri, "tcp:", &p)) {
+ tcp_start_incoming_migration(p, errp);
+#ifdef CONFIG_RDMA
+ } else if (strstart(uri, "rdma:", &p)) {
+ rdma_start_incoming_migration(p, errp);
+#endif
+#if !defined(WIN32)
+ } else if (strstart(uri, "exec:", &p)) {
+ exec_start_incoming_migration(p, errp);
+ } else if (strstart(uri, "unix:", &p)) {
+ unix_start_incoming_migration(p, errp);
+ } else if (strstart(uri, "fd:", &p)) {
+ fd_start_incoming_migration(p, errp);
+#endif
+ } else {
+ error_setg(errp, "unknown migration protocol: %s", uri);
+ }
+}
+
+static void process_incoming_migration_co(void *opaque)
+{
+ QEMUFile *f = opaque;
+ Error *local_err = NULL;
+ int ret;
+
+ migration_incoming_state_new(f);
+ migrate_generate_event(MIGRATION_STATUS_ACTIVE);
+ ret = qemu_loadvm_state(f);
+
+ qemu_fclose(f);
+ free_xbzrle_decoded_buf();
+ migration_incoming_state_destroy();
+
+ if (ret < 0) {
+ migrate_generate_event(MIGRATION_STATUS_FAILED);
+ error_report("load of migration failed: %s", strerror(-ret));
+ migrate_decompress_threads_join();
+ exit(EXIT_FAILURE);
+ }
+ migrate_generate_event(MIGRATION_STATUS_COMPLETED);
+ qemu_announce_self();
+
+ /* Make sure all file formats flush their mutable metadata */
+ bdrv_invalidate_cache_all(&local_err);
+ if (local_err) {
+ error_report_err(local_err);
+ migrate_decompress_threads_join();
+ exit(EXIT_FAILURE);
+ }
+
+ /* 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. */
+
+ if (!global_state_received() ||
+ global_state_get_runstate() == RUN_STATE_RUNNING) {
+ if (autostart) {
+ vm_start();
+ } else {
+ runstate_set(RUN_STATE_PAUSED);
+ }
+ } else {
+ runstate_set(global_state_get_runstate());
+ }
+ migrate_decompress_threads_join();
+}
+
+void process_incoming_migration(QEMUFile *f)
+{
+ Coroutine *co = qemu_coroutine_create(process_incoming_migration_co);
+ int fd = qemu_get_fd(f);
+
+ assert(fd != -1);
+ migrate_decompress_threads_create();
+ qemu_set_nonblock(fd);
+ qemu_coroutine_enter(co, f);
+}
+
+/* amount of nanoseconds we are willing to wait for migration to be down.
+ * the choice of nanoseconds is because it is the maximum resolution that
+ * get_clock() can achieve. It is an internal measure. All user-visible
+ * units must be in seconds */
+static uint64_t max_downtime = 300000000;
+
+uint64_t migrate_max_downtime(void)
+{
+ return max_downtime;
+}
+
+MigrationCapabilityStatusList *qmp_query_migrate_capabilities(Error **errp)
+{
+ MigrationCapabilityStatusList *head = NULL;
+ MigrationCapabilityStatusList *caps;
+ MigrationState *s = migrate_get_current();
+ int i;
+
+ caps = NULL; /* silence compiler warning */
+ for (i = 0; i < MIGRATION_CAPABILITY_MAX; i++) {
+ if (head == NULL) {
+ head = g_malloc0(sizeof(*caps));
+ caps = head;
+ } else {
+ caps->next = g_malloc0(sizeof(*caps));
+ caps = caps->next;
+ }
+ caps->value =
+ g_malloc(sizeof(*caps->value));
+ caps->value->capability = i;
+ caps->value->state = s->enabled_capabilities[i];
+ }
+
+ return head;
+}
+
+MigrationParameters *qmp_query_migrate_parameters(Error **errp)
+{
+ MigrationParameters *params;
+ MigrationState *s = migrate_get_current();
+
+ params = g_malloc0(sizeof(*params));
+ params->compress_level = s->parameters[MIGRATION_PARAMETER_COMPRESS_LEVEL];
+ params->compress_threads =
+ s->parameters[MIGRATION_PARAMETER_COMPRESS_THREADS];
+ params->decompress_threads =
+ s->parameters[MIGRATION_PARAMETER_DECOMPRESS_THREADS];
+
+ return params;
+}
+
+static void get_xbzrle_cache_stats(MigrationInfo *info)
+{
+ 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_mig_bytes_transferred();
+ info->xbzrle_cache->pages = xbzrle_mig_pages_transferred();
+ info->xbzrle_cache->cache_miss = xbzrle_mig_pages_cache_miss();
+ info->xbzrle_cache->cache_miss_rate = xbzrle_mig_cache_miss_rate();
+ info->xbzrle_cache->overflow = xbzrle_mig_pages_overflow();
+ }
+}
+
+MigrationInfo *qmp_query_migrate(Error **errp)
+{
+ MigrationInfo *info = g_malloc0(sizeof(*info));
+ MigrationState *s = migrate_get_current();
+
+ switch (s->state) {
+ case MIGRATION_STATUS_NONE:
+ /* no migration has happened ever */
+ break;
+ case MIGRATION_STATUS_SETUP:
+ info->has_status = true;
+ info->has_total_time = false;
+ break;
+ case MIGRATION_STATUS_ACTIVE:
+ case MIGRATION_STATUS_CANCELLING:
+ info->has_status = true;
+ info->has_total_time = true;
+ info->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME)
+ - s->total_time;
+ info->has_expected_downtime = true;
+ info->expected_downtime = s->expected_downtime;
+ info->has_setup_time = true;
+ info->setup_time = s->setup_time;
+
+ info->has_ram = true;
+ info->ram = g_malloc0(sizeof(*info->ram));
+ info->ram->transferred = ram_bytes_transferred();
+ info->ram->remaining = ram_bytes_remaining();
+ info->ram->total = ram_bytes_total();
+ info->ram->duplicate = dup_mig_pages_transferred();
+ info->ram->skipped = skipped_mig_pages_transferred();
+ info->ram->normal = norm_mig_pages_transferred();
+ info->ram->normal_bytes = norm_mig_bytes_transferred();
+ info->ram->dirty_pages_rate = s->dirty_pages_rate;
+ info->ram->mbps = s->mbps;
+ info->ram->dirty_sync_count = s->dirty_sync_count;
+
+ 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();
+ }
+
+ get_xbzrle_cache_stats(info);
+ break;
+ case MIGRATION_STATUS_COMPLETED:
+ get_xbzrle_cache_stats(info);
+
+ info->has_status = true;
+ info->has_total_time = true;
+ info->total_time = s->total_time;
+ info->has_downtime = true;
+ info->downtime = s->downtime;
+ info->has_setup_time = true;
+ info->setup_time = s->setup_time;
+
+ info->has_ram = true;
+ info->ram = g_malloc0(sizeof(*info->ram));
+ info->ram->transferred = ram_bytes_transferred();
+ info->ram->remaining = 0;
+ info->ram->total = ram_bytes_total();
+ info->ram->duplicate = dup_mig_pages_transferred();
+ info->ram->skipped = skipped_mig_pages_transferred();
+ info->ram->normal = norm_mig_pages_transferred();
+ info->ram->normal_bytes = norm_mig_bytes_transferred();
+ info->ram->mbps = s->mbps;
+ info->ram->dirty_sync_count = s->dirty_sync_count;
+ break;
+ case MIGRATION_STATUS_FAILED:
+ info->has_status = true;
+ break;
+ case MIGRATION_STATUS_CANCELLED:
+ info->has_status = true;
+ break;
+ }
+ info->status = s->state;
+
+ return info;
+}
+
+void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params,
+ Error **errp)
+{
+ MigrationState *s = migrate_get_current();
+ MigrationCapabilityStatusList *cap;
+
+ if (s->state == MIGRATION_STATUS_ACTIVE ||
+ s->state == MIGRATION_STATUS_SETUP) {
+ error_setg(errp, QERR_MIGRATION_ACTIVE);
+ return;
+ }
+
+ for (cap = params; cap; cap = cap->next) {
+ s->enabled_capabilities[cap->value->capability] = cap->value->state;
+ }
+}
+
+void qmp_migrate_set_parameters(bool has_compress_level,
+ int64_t compress_level,
+ bool has_compress_threads,
+ int64_t compress_threads,
+ bool has_decompress_threads,
+ int64_t decompress_threads, Error **errp)
+{
+ MigrationState *s = migrate_get_current();
+
+ if (has_compress_level && (compress_level < 0 || compress_level > 9)) {
+ error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "compress_level",
+ "is invalid, it should be in the range of 0 to 9");
+ return;
+ }
+ if (has_compress_threads &&
+ (compress_threads < 1 || compress_threads > 255)) {
+ error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
+ "compress_threads",
+ "is invalid, it should be in the range of 1 to 255");
+ return;
+ }
+ if (has_decompress_threads &&
+ (decompress_threads < 1 || decompress_threads > 255)) {
+ error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
+ "decompress_threads",
+ "is invalid, it should be in the range of 1 to 255");
+ return;
+ }
+
+ if (has_compress_level) {
+ s->parameters[MIGRATION_PARAMETER_COMPRESS_LEVEL] = compress_level;
+ }
+ if (has_compress_threads) {
+ s->parameters[MIGRATION_PARAMETER_COMPRESS_THREADS] = compress_threads;
+ }
+ if (has_decompress_threads) {
+ s->parameters[MIGRATION_PARAMETER_DECOMPRESS_THREADS] =
+ decompress_threads;
+ }
+}
+
+/* shared migration helpers */
+
+static void migrate_set_state(MigrationState *s, int old_state, int new_state)
+{
+ if (atomic_cmpxchg(&s->state, old_state, new_state) == old_state) {
+ trace_migrate_set_state(new_state);
+ migrate_generate_event(new_state);
+ }
+}
+
+static void migrate_fd_cleanup(void *opaque)
+{
+ MigrationState *s = opaque;
+
+ qemu_bh_delete(s->cleanup_bh);
+ s->cleanup_bh = NULL;
+
+ if (s->file) {
+ trace_migrate_fd_cleanup();
+ qemu_mutex_unlock_iothread();
+ qemu_thread_join(&s->thread);
+ qemu_mutex_lock_iothread();
+
+ migrate_compress_threads_join();
+ qemu_fclose(s->file);
+ s->file = NULL;
+ }
+
+ assert(s->state != MIGRATION_STATUS_ACTIVE);
+
+ if (s->state != MIGRATION_STATUS_COMPLETED) {
+ qemu_savevm_state_cancel();
+ if (s->state == MIGRATION_STATUS_CANCELLING) {
+ migrate_set_state(s, MIGRATION_STATUS_CANCELLING,
+ MIGRATION_STATUS_CANCELLED);
+ }
+ }
+
+ notifier_list_notify(&migration_state_notifiers, s);
+}
+
+void migrate_fd_error(MigrationState *s)
+{
+ trace_migrate_fd_error();
+ assert(s->file == NULL);
+ migrate_set_state(s, MIGRATION_STATUS_SETUP, MIGRATION_STATUS_FAILED);
+ notifier_list_notify(&migration_state_notifiers, s);
+}
+
+static void migrate_fd_cancel(MigrationState *s)
+{
+ int old_state ;
+ QEMUFile *f = migrate_get_current()->file;
+ trace_migrate_fd_cancel();
+
+ do {
+ old_state = s->state;
+ if (old_state != MIGRATION_STATUS_SETUP &&
+ old_state != MIGRATION_STATUS_ACTIVE) {
+ break;
+ }
+ migrate_set_state(s, 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);
+ }
+}
+
+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);
+}
+
+static MigrationState *migrate_init(const MigrationParams *params)
+{
+ MigrationState *s = migrate_get_current();
+ int64_t bandwidth_limit = s->bandwidth_limit;
+ bool enabled_capabilities[MIGRATION_CAPABILITY_MAX];
+ int64_t xbzrle_cache_size = s->xbzrle_cache_size;
+ int compress_level = s->parameters[MIGRATION_PARAMETER_COMPRESS_LEVEL];
+ int compress_thread_count =
+ s->parameters[MIGRATION_PARAMETER_COMPRESS_THREADS];
+ int decompress_thread_count =
+ s->parameters[MIGRATION_PARAMETER_DECOMPRESS_THREADS];
+
+ memcpy(enabled_capabilities, s->enabled_capabilities,
+ sizeof(enabled_capabilities));
+
+ memset(s, 0, sizeof(*s));
+ s->params = *params;
+ memcpy(s->enabled_capabilities, enabled_capabilities,
+ sizeof(enabled_capabilities));
+ s->xbzrle_cache_size = xbzrle_cache_size;
+
+ s->parameters[MIGRATION_PARAMETER_COMPRESS_LEVEL] = compress_level;
+ s->parameters[MIGRATION_PARAMETER_COMPRESS_THREADS] =
+ compress_thread_count;
+ s->parameters[MIGRATION_PARAMETER_DECOMPRESS_THREADS] =
+ decompress_thread_count;
+ s->bandwidth_limit = bandwidth_limit;
+ migrate_set_state(s, MIGRATION_STATUS_NONE, MIGRATION_STATUS_SETUP);
+
+ s->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
+ return s;
+}
+
+static GSList *migration_blockers;
+
+void migrate_add_blocker(Error *reason)
+{
+ migration_blockers = g_slist_prepend(migration_blockers, reason);
+}
+
+void migrate_del_blocker(Error *reason)
+{
+ migration_blockers = g_slist_remove(migration_blockers, reason);
+}
+
+void qmp_migrate_incoming(const char *uri, Error **errp)
+{
+ Error *local_err = NULL;
+ static bool once = true;
+
+ if (!deferred_incoming) {
+ error_setg(errp, "For use with '-incoming defer'");
+ return;
+ }
+ if (!once) {
+ error_setg(errp, "The incoming migration has already been started");
+ }
+
+ qemu_start_incoming_migration(uri, &local_err);
+
+ if (local_err) {
+ error_propagate(errp, local_err);
+ return;
+ }
+
+ once = false;
+}
+
+void qmp_migrate(const char *uri, bool has_blk, bool blk,
+ bool has_inc, bool inc, bool has_detach, bool detach,
+ Error **errp)
+{
+ Error *local_err = NULL;
+ MigrationState *s = migrate_get_current();
+ MigrationParams params;
+ const char *p;
+
+ params.blk = has_blk && blk;
+ params.shared = has_inc && inc;
+
+ if (s->state == MIGRATION_STATUS_ACTIVE ||
+ s->state == MIGRATION_STATUS_SETUP ||
+ s->state == MIGRATION_STATUS_CANCELLING) {
+ error_setg(errp, QERR_MIGRATION_ACTIVE);
+ return;
+ }
+ if (runstate_check(RUN_STATE_INMIGRATE)) {
+ error_setg(errp, "Guest is waiting for an incoming migration");
+ return;
+ }
+
+ if (qemu_savevm_state_blocked(errp)) {
+ return;
+ }
+
+ if (migration_blockers) {
+ *errp = error_copy(migration_blockers->data);
+ return;
+ }
+
+ /* We are starting a new migration, so we want to start in a clean
+ state. This change is only needed if previous migration
+ failed/was cancelled. We don't use migrate_set_state() because
+ we are setting the initial state, not changing it. */
+ s->state = MIGRATION_STATUS_NONE;
+
+ s = migrate_init(¶ms);
+
+ if (strstart(uri, "tcp:", &p)) {
+ tcp_start_outgoing_migration(s, p, &local_err);
+#ifdef CONFIG_RDMA
+ } else if (strstart(uri, "rdma:", &p)) {
+ rdma_start_outgoing_migration(s, p, &local_err);
+#endif
+#if !defined(WIN32)
+ } else if (strstart(uri, "exec:", &p)) {
+ exec_start_outgoing_migration(s, p, &local_err);
+ } else if (strstart(uri, "unix:", &p)) {
+ unix_start_outgoing_migration(s, p, &local_err);
+ } else if (strstart(uri, "fd:", &p)) {
+ fd_start_outgoing_migration(s, p, &local_err);
+#endif
+ } else {
+ error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "uri",
+ "a valid migration protocol");
+ migrate_set_state(s, MIGRATION_STATUS_SETUP, MIGRATION_STATUS_FAILED);
+ return;
+ }
+
+ if (local_err) {
+ migrate_fd_error(s);
+ error_propagate(errp, local_err);
+ return;
+ }
+}
+
+void qmp_migrate_cancel(Error **errp)
+{
+ migrate_fd_cancel(migrate_get_current());
+}
+
+void qmp_migrate_set_cache_size(int64_t value, Error **errp)
+{
+ MigrationState *s = migrate_get_current();
+ int64_t new_size;
+
+ /* Check for truncation */
+ if (value != (size_t)value) {
+ error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size",
+ "exceeding address space");
+ return;
+ }
+
+ /* Cache should not be larger than guest ram size */
+ if (value > ram_bytes_total()) {
+ error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size",
+ "exceeds guest ram size ");
+ return;
+ }
+
+ new_size = xbzrle_cache_resize(value);
+ if (new_size < 0) {
+ error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size",
+ "is smaller than page size");
+ return;
+ }
+
+ s->xbzrle_cache_size = new_size;
+}
+
+int64_t qmp_query_migrate_cache_size(Error **errp)
+{
+ return migrate_xbzrle_cache_size();
+}
+
+void qmp_migrate_set_speed(int64_t value, Error **errp)
+{
+ MigrationState *s;
+
+ if (value < 0) {
+ value = 0;
+ }
+ if (value > SIZE_MAX) {
+ value = SIZE_MAX;
+ }
+
+ s = migrate_get_current();
+ s->bandwidth_limit = value;
+ if (s->file) {
+ qemu_file_set_rate_limit(s->file, s->bandwidth_limit / XFER_LIMIT_RATIO);
+ }
+}
+
+void qmp_migrate_set_downtime(double value, Error **errp)
+{
+ value *= 1e9;
+ value = MAX(0, MIN(UINT64_MAX, value));
+ max_downtime = (uint64_t)value;
+}
+
+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_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[MIGRATION_PARAMETER_COMPRESS_LEVEL];
+}
+
+int migrate_compress_threads(void)
+{
+ MigrationState *s;
+
+ s = migrate_get_current();
+
+ return s->parameters[MIGRATION_PARAMETER_COMPRESS_THREADS];
+}
+
+int migrate_decompress_threads(void)
+{
+ MigrationState *s;
+
+ s = migrate_get_current();
+
+ return s->parameters[MIGRATION_PARAMETER_DECOMPRESS_THREADS];
+}
+
+bool migrate_use_events(void)
+{
+ MigrationState *s;
+
+ s = migrate_get_current();
+
+ return s->enabled_capabilities[MIGRATION_CAPABILITY_EVENTS];
+}
+
+int migrate_use_xbzrle(void)
+{
+ MigrationState *s;
+
+ s = migrate_get_current();
+
+ return s->enabled_capabilities[MIGRATION_CAPABILITY_XBZRLE];
+}
+
+int64_t migrate_xbzrle_cache_size(void)
+{
+ MigrationState *s;
+
+ s = migrate_get_current();
+
+ return s->xbzrle_cache_size;
+}
+
+/* migration thread support */
+
+static void *migration_thread(void *opaque)
+{
+ MigrationState *s = opaque;
+ int64_t initial_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
+ int64_t setup_start = qemu_clock_get_ms(QEMU_CLOCK_HOST);
+ int64_t initial_bytes = 0;
+ int64_t max_size = 0;
+ int64_t start_time = initial_time;
+ bool old_vm_running = false;
+
+ rcu_register_thread();
+
+ qemu_savevm_state_header(s->file);
+ qemu_savevm_state_begin(s->file, &s->params);
+
+ s->setup_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) - setup_start;
+ migrate_set_state(s, MIGRATION_STATUS_SETUP, MIGRATION_STATUS_ACTIVE);
+
+ while (s->state == MIGRATION_STATUS_ACTIVE) {
+ int64_t current_time;
+ uint64_t pending_size;
+
+ if (!qemu_file_rate_limit(s->file)) {
+ pending_size = qemu_savevm_state_pending(s->file, max_size);
+ trace_migrate_pending(pending_size, max_size);
+ if (pending_size && pending_size >= max_size) {
+ qemu_savevm_state_iterate(s->file);
+ } else {
+ int ret;
+
+ qemu_mutex_lock_iothread();
+ start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
+ qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
+ old_vm_running = runstate_is_running();
+
+ ret = global_state_store();
+ if (!ret) {
+ ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
+ if (ret >= 0) {
+ qemu_file_set_rate_limit(s->file, INT64_MAX);
+ qemu_savevm_state_complete(s->file);
+ }
+ }
+ qemu_mutex_unlock_iothread();
+
+ if (ret < 0) {
+ migrate_set_state(s, MIGRATION_STATUS_ACTIVE,
+ MIGRATION_STATUS_FAILED);
+ break;
+ }
+
+ if (!qemu_file_get_error(s->file)) {
+ migrate_set_state(s, MIGRATION_STATUS_ACTIVE,
+ MIGRATION_STATUS_COMPLETED);
+ break;
+ }
+ }
+ }
+
+ if (qemu_file_get_error(s->file)) {
+ migrate_set_state(s, MIGRATION_STATUS_ACTIVE,
+ MIGRATION_STATUS_FAILED);
+ break;
+ }
+ current_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
+ if (current_time >= initial_time + BUFFER_DELAY) {
+ uint64_t transferred_bytes = qemu_ftell(s->file) - initial_bytes;
+ uint64_t time_spent = current_time - initial_time;
+ double bandwidth = transferred_bytes / time_spent;
+ max_size = bandwidth * migrate_max_downtime() / 1000000;
+
+ s->mbps = time_spent ? (((double) transferred_bytes * 8.0) /
+ ((double) time_spent / 1000.0)) / 1000.0 / 1000.0 : -1;
+
+ trace_migrate_transferred(transferred_bytes, time_spent,
+ bandwidth, max_size);
+ /* if we haven't sent anything, we don't want to recalculate
+ 10000 is a small enough number for our purposes */
+ if (s->dirty_bytes_rate && transferred_bytes > 10000) {
+ s->expected_downtime = s->dirty_bytes_rate / bandwidth;
+ }
+
+ qemu_file_reset_rate_limit(s->file);
+ initial_time = current_time;
+ initial_bytes = qemu_ftell(s->file);
+ }
+ if (qemu_file_rate_limit(s->file)) {
+ /* usleep expects microseconds */
+ g_usleep((initial_time + BUFFER_DELAY - current_time)*1000);
+ }
+ }
+
+ qemu_mutex_lock_iothread();
+ if (s->state == MIGRATION_STATUS_COMPLETED) {
+ int64_t end_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
+ uint64_t transferred_bytes = qemu_ftell(s->file);
+ s->total_time = end_time - s->total_time;
+ s->downtime = end_time - start_time;
+ if (s->total_time) {
+ s->mbps = (((double) transferred_bytes * 8.0) /
+ ((double) s->total_time)) / 1000;
+ }
+ runstate_set(RUN_STATE_POSTMIGRATE);
+ } else {
+ if (old_vm_running) {
+ vm_start();
+ }
+ }
+ qemu_bh_schedule(s->cleanup_bh);
+ qemu_mutex_unlock_iothread();
+
+ rcu_unregister_thread();
+ return NULL;
+}
+
+void migrate_fd_connect(MigrationState *s)
+{
+ /* This is a best 1st approximation. ns to ms */
+ s->expected_downtime = max_downtime/1000000;
+ s->cleanup_bh = qemu_bh_new(migrate_fd_cleanup, s);
+
+ qemu_file_set_rate_limit(s->file,
+ s->bandwidth_limit / XFER_LIMIT_RATIO);
+
+ /* Notify before starting migration thread */
+ notifier_list_notify(&migration_state_notifiers, s);
+
+ migrate_compress_threads_create();
+ qemu_thread_create(&s->thread, "migration", migration_thread, s,
+ QEMU_THREAD_JOINABLE);
+}
Code Review / kvmfornfv.git / blobdiff