#include "migration/vmstate.h"
#include "block/block.h"
#include "qapi/qmp/qerror.h"
-#include "qapi/util.h"
#include "qemu/rcu.h"
#include "block.h"
#include "postcopy-ram.h"
#define DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT 10
/* Migration XBZRLE default cache size */
-#define DEFAULT_MIGRATE_CACHE_SIZE (64 * 1024 * 1024)
+#define DEFAULT_MIGRATE_XBZRLE_CACHE_SIZE (64 * 1024 * 1024)
/* The delay time (in ms) between two COLO checkpoints
* Note: Please change this default value to 10000 when we support hybrid mode.
*/
#define DEFAULT_MIGRATE_X_CHECKPOINT_DELAY 200
+#define DEFAULT_MIGRATE_MULTIFD_CHANNELS 2
+#define DEFAULT_MIGRATE_MULTIFD_PAGE_COUNT 16
static NotifierList migration_state_notifiers =
NOTIFIER_LIST_INITIALIZER(migration_state_notifiers);
static MigrationState *current_migration;
static bool migration_object_check(MigrationState *ms, Error **errp);
+static int migration_maybe_pause(MigrationState *s,
+ int *current_active_state,
+ int new_state);
void migration_object_init(void)
{
}
}
+void migration_object_finalize(void)
+{
+ object_unref(OBJECT(current_migration));
+}
+
/* For outgoing */
MigrationState *migrate_get_current(void)
{
mis->from_src_file = NULL;
}
- qemu_event_destroy(&mis->main_thread_load_event);
+ qemu_event_reset(&mis->main_thread_load_event);
}
static void migrate_generate_event(int new_state)
*/
qemu_announce_self();
+ 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. */
static void process_incoming_migration_co(void *opaque)
{
- QEMUFile *f = opaque;
MigrationIncomingState *mis = migration_incoming_get_current();
PostcopyState ps;
int ret;
- mis->from_src_file = f;
+ assert(mis->from_src_file);
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(f);
+ ret = qemu_loadvm_state(mis->from_src_file);
ps = postcopy_state_get();
trace_process_incoming_migration_co_end(ret, ps);
}
if (ret < 0) {
+ Error *local_err = NULL;
+
migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE,
MIGRATION_STATUS_FAILED);
error_report("load of migration failed: %s", strerror(-ret));
qemu_fclose(mis->from_src_file);
+ if (multifd_load_cleanup(&local_err) != 0) {
+ error_report_err(local_err);
+ }
exit(EXIT_FAILURE);
}
mis->bh = qemu_bh_new(process_incoming_migration_bh, mis);
qemu_bh_schedule(mis->bh);
}
-void migration_fd_process_incoming(QEMUFile *f)
+static void migration_incoming_setup(QEMUFile *f)
{
- Coroutine *co = qemu_coroutine_create(process_incoming_migration_co, f);
+ MigrationIncomingState *mis = migration_incoming_get_current();
+
+ if (multifd_load_setup() != 0) {
+ /* We haven't been able to create multifd threads
+ nothing better to do */
+ exit(EXIT_FAILURE);
+ }
+ if (!mis->from_src_file) {
+ mis->from_src_file = f;
+ }
qemu_file_set_blocking(f, false);
+}
+
+static void migration_incoming_process(void)
+{
+ Coroutine *co = qemu_coroutine_create(process_incoming_migration_co, NULL);
qemu_coroutine_enter(co);
}
+void migration_fd_process_incoming(QEMUFile *f)
+{
+ migration_incoming_setup(f);
+ migration_incoming_process();
+}
+
+void migration_ioc_process_incoming(QIOChannel *ioc)
+{
+ MigrationIncomingState *mis = migration_incoming_get_current();
+
+ if (!mis->from_src_file) {
+ QEMUFile *f = qemu_fopen_channel_input(ioc);
+ migration_fd_process_incoming(f);
+ }
+ /* We still only have a single channel. Nothing to do here yet */
+}
+
+/**
+ * @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)
+{
+ 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
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->cpu_throttle_initial = s->parameters.cpu_throttle_initial;
params->has_cpu_throttle_increment = true;
params->cpu_throttle_increment = s->parameters.cpu_throttle_increment;
- params->has_tls_creds = !!s->parameters.tls_creds;
+ params->has_tls_creds = true;
params->tls_creds = g_strdup(s->parameters.tls_creds);
- params->has_tls_hostname = !!s->parameters.tls_hostname;
+ params->has_tls_hostname = true;
params->tls_hostname = g_strdup(s->parameters.tls_hostname);
params->has_max_bandwidth = true;
params->max_bandwidth = s->parameters.max_bandwidth;
params->x_checkpoint_delay = s->parameters.x_checkpoint_delay;
params->has_block_incremental = true;
params->block_incremental = s->parameters.block_incremental;
+ params->has_x_multifd_channels = true;
+ params->x_multifd_channels = s->parameters.x_multifd_channels;
+ params->has_x_multifd_page_count = true;
+ params->x_multifd_page_count = s->parameters.x_multifd_page_count;
+ params->has_xbzrle_cache_size = true;
+ params->xbzrle_cache_size = s->parameters.xbzrle_cache_size;
return params;
}
case MIGRATION_STATUS_ACTIVE:
case MIGRATION_STATUS_POSTCOPY_ACTIVE:
case MIGRATION_STATUS_SETUP:
+ case MIGRATION_STATUS_PRE_SWITCHOVER:
+ case MIGRATION_STATUS_DEVICE:
return true;
default:
case MIGRATION_STATUS_ACTIVE:
case MIGRATION_STATUS_CANCELLING:
case MIGRATION_STATUS_POSTCOPY_ACTIVE:
+ case MIGRATION_STATUS_PRE_SWITCHOVER:
+ case MIGRATION_STATUS_DEVICE:
/* TODO add some postcopy stats */
info->has_status = true;
info->has_total_time = true;
info->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME)
- - s->total_time;
+ - s->start_time;
info->has_expected_downtime = true;
info->expected_downtime = s->expected_downtime;
info->has_setup_time = true;
{
MigrationCapabilityStatusList *cap;
bool old_postcopy_cap;
+ MigrationIncomingState *mis = migration_incoming_get_current();
old_postcopy_cap = cap_list[MIGRATION_CAPABILITY_POSTCOPY_RAM];
* special support.
*/
if (!old_postcopy_cap && runstate_check(RUN_STATE_INMIGRATE) &&
- !postcopy_ram_supported_by_host()) {
+ !postcopy_ram_supported_by_host(mis)) {
/* postcopy_ram_supported_by_host will have emitted a more
* detailed message
*/
static bool migrate_params_check(MigrationParameters *params, Error **errp)
{
if (params->has_compress_level &&
- (params->compress_level < 0 || params->compress_level > 9)) {
+ (params->compress_level > 9)) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "compress_level",
"is invalid, it should be in the range of 0 to 9");
return false;
}
- if (params->has_compress_threads &&
- (params->compress_threads < 1 || params->compress_threads > 255)) {
+ if (params->has_compress_threads && (params->compress_threads < 1)) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
"compress_threads",
"is invalid, it should be in the range of 1 to 255");
return false;
}
- if (params->has_decompress_threads &&
- (params->decompress_threads < 1 || params->decompress_threads > 255)) {
+ if (params->has_decompress_threads && (params->decompress_threads < 1)) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
"decompress_threads",
"is invalid, it should be in the range of 1 to 255");
return false;
}
- if (params->has_max_bandwidth &&
- (params->max_bandwidth < 0 || params->max_bandwidth > SIZE_MAX)) {
+ if (params->has_max_bandwidth && (params->max_bandwidth > SIZE_MAX)) {
error_setg(errp, "Parameter 'max_bandwidth' expects an integer in the"
" range of 0 to %zu bytes/second", SIZE_MAX);
return false;
}
if (params->has_downtime_limit &&
- (params->downtime_limit < 0 ||
- params->downtime_limit > MAX_MIGRATE_DOWNTIME)) {
+ (params->downtime_limit > MAX_MIGRATE_DOWNTIME)) {
error_setg(errp, "Parameter 'downtime_limit' expects an integer in "
"the range of 0 to %d milliseconds",
MAX_MIGRATE_DOWNTIME);
return false;
}
- if (params->has_x_checkpoint_delay && (params->x_checkpoint_delay < 0)) {
+ /* x_checkpoint_delay is now always positive */
+
+ if (params->has_x_multifd_channels && (params->x_multifd_channels < 1)) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
- "x_checkpoint_delay",
- "is invalid, it should be positive");
+ "multifd_channels",
+ "is invalid, it should be in the range of 1 to 255");
+ return false;
+ }
+ if (params->has_x_multifd_page_count &&
+ (params->x_multifd_page_count < 1 ||
+ params->x_multifd_page_count > 10000)) {
+ error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
+ "multifd_page_count",
+ "is invalid, it should be in the range of 1 to 10000");
+ return false;
+ }
+
+ if (params->has_xbzrle_cache_size &&
+ (params->xbzrle_cache_size < qemu_target_page_size() ||
+ !is_power_of_2(params->xbzrle_cache_size))) {
+ error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
+ "xbzrle_cache_size",
+ "is invalid, it should be bigger than target page size"
+ " and a power of two");
return false;
}
return true;
}
-static void migrate_params_apply(MigrationParameters *params)
+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_decompress_threads) {
+ dest->decompress_threads = params->decompress_threads;
+ }
+
+ if (params->has_cpu_throttle_initial) {
+ dest->cpu_throttle_initial = params->cpu_throttle_initial;
+ }
+
+ if (params->has_cpu_throttle_increment) {
+ dest->cpu_throttle_increment = params->cpu_throttle_increment;
+ }
+
+ if (params->has_tls_creds) {
+ assert(params->tls_creds->type == QTYPE_QSTRING);
+ dest->tls_creds = g_strdup(params->tls_creds->u.s);
+ }
+
+ if (params->has_tls_hostname) {
+ assert(params->tls_hostname->type == QTYPE_QSTRING);
+ dest->tls_hostname = g_strdup(params->tls_hostname->u.s);
+ }
+
+ if (params->has_max_bandwidth) {
+ dest->max_bandwidth = params->max_bandwidth;
+ }
+
+ if (params->has_downtime_limit) {
+ dest->downtime_limit = params->downtime_limit;
+ }
+
+ if (params->has_x_checkpoint_delay) {
+ dest->x_checkpoint_delay = params->x_checkpoint_delay;
+ }
+
+ if (params->has_block_incremental) {
+ dest->block_incremental = params->block_incremental;
+ }
+ if (params->has_x_multifd_channels) {
+ dest->x_multifd_channels = params->x_multifd_channels;
+ }
+ if (params->has_x_multifd_page_count) {
+ dest->x_multifd_page_count = params->x_multifd_page_count;
+ }
+ if (params->has_xbzrle_cache_size) {
+ dest->xbzrle_cache_size = params->xbzrle_cache_size;
+ }
+}
+
+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_tls_creds) {
g_free(s->parameters.tls_creds);
- s->parameters.tls_creds = g_strdup(params->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);
- s->parameters.tls_hostname = g_strdup(params->tls_hostname);
+ assert(params->tls_hostname->type == QTYPE_QSTRING);
+ s->parameters.tls_hostname = g_strdup(params->tls_hostname->u.s);
}
if (params->has_max_bandwidth) {
if (params->has_block_incremental) {
s->parameters.block_incremental = params->block_incremental;
}
+ if (params->has_x_multifd_channels) {
+ s->parameters.x_multifd_channels = params->x_multifd_channels;
+ }
+ if (params->has_x_multifd_page_count) {
+ s->parameters.x_multifd_page_count = params->x_multifd_page_count;
+ }
+ if (params->has_xbzrle_cache_size) {
+ s->parameters.xbzrle_cache_size = params->xbzrle_cache_size;
+ xbzrle_cache_resize(params->xbzrle_cache_size, errp);
+ }
}
-void qmp_migrate_set_parameters(MigrationParameters *params, Error **errp)
+void qmp_migrate_set_parameters(MigrateSetParameters *params, Error **errp)
{
- if (!migrate_params_check(params, errp)) {
+ MigrationParameters tmp;
+
+ /* TODO Rewrite "" to null instead */
+ if (params->has_tls_creds
+ && params->tls_creds->type == QTYPE_QNULL) {
+ QDECREF(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) {
+ QDECREF(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);
+ migrate_params_apply(params, errp);
}
void migrate_set_state(int *state, int old_state, int new_state)
{
+ assert(new_state < MIGRATION_STATUS__MAX);
if (atomic_cmpxchg(state, old_state, new_state) == old_state) {
- trace_migrate_set_state(new_state);
+ trace_migrate_set_state(MigrationStatus_str(new_state));
migrate_generate_event(new_state);
}
}
qemu_bh_delete(s->cleanup_bh);
s->cleanup_bh = NULL;
+ qemu_savevm_state_cleanup();
+
if (s->to_dst_file) {
+ Error *local_err = NULL;
+
trace_migrate_fd_cleanup();
qemu_mutex_unlock_iothread();
if (s->migration_thread_running) {
}
qemu_mutex_lock_iothread();
+ if (multifd_save_cleanup(&local_err) != 0) {
+ error_report_err(local_err);
+ }
qemu_fclose(s->to_dst_file);
s->to_dst_file = NULL;
}
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);
}
+void migrate_set_error(MigrationState *s, const Error *error)
+{
+ qemu_mutex_lock(&s->error_mutex);
+ if (!s->error) {
+ s->error = error_copy(error);
+ }
+ qemu_mutex_unlock(&s->error_mutex);
+}
+
void migrate_fd_error(MigrationState *s, const Error *error)
{
trace_migrate_fd_error(error_get_pretty(error));
assert(s->to_dst_file == NULL);
migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
MIGRATION_STATUS_FAILED);
- if (!s->error) {
- s->error = error_copy(error);
- }
- notifier_list_notify(&migration_state_notifiers, s);
- block_cleanup_parameters(s);
+ migrate_set_error(s, error);
}
static void migrate_fd_cancel(MigrationState *s)
if (!migration_is_setup_or_active(old_state)) {
break;
}
+ /* If the migration is paused, kick it out of the pause */
+ if (old_state == MIGRATION_STATUS_PRE_SWITCHOVER) {
+ qemu_sem_post(&s->pause_sem);
+ }
migrate_set_state(&s->state, old_state, MIGRATION_STATUS_CANCELLING);
} while (s->state != MIGRATION_STATUS_CANCELLING);
s->block_inactive = false;
}
}
- block_cleanup_parameters(s);
}
void add_migration_state_change_notifier(Notifier *notify)
case MIGRATION_STATUS_ACTIVE:
case MIGRATION_STATUS_POSTCOPY_ACTIVE:
case MIGRATION_STATUS_COLO:
+ case MIGRATION_STATUS_PRE_SWITCHOVER:
+ case MIGRATION_STATUS_DEVICE:
return false;
case MIGRATION_STATUS__MAX:
g_assert_not_reached();
migrate_set_state(&s->state, MIGRATION_STATUS_NONE, MIGRATION_STATUS_SETUP);
- s->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
+ 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;
return s;
}
migrate_fd_cancel(migrate_get_current());
}
-void qmp_migrate_set_cache_size(int64_t value, Error **errp)
+void qmp_migrate_continue(MigrationStatus state, 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 ");
+ if (s->state != state) {
+ error_setg(errp, "Migration not in expected state: %s",
+ MigrationStatus_str(s->state));
return;
}
+ qemu_sem_post(&s->pause_sem);
+}
- 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;
- }
+void qmp_migrate_set_cache_size(int64_t value, Error **errp)
+{
+ MigrateSetParameters p = {
+ .has_xbzrle_cache_size = true,
+ .xbzrle_cache_size = value,
+ };
- s->xbzrle_cache_size = new_size;
+ qmp_migrate_set_parameters(&p, errp);
}
int64_t qmp_query_migrate_cache_size(Error **errp)
void qmp_migrate_set_speed(int64_t value, Error **errp)
{
- MigrationParameters p = {
+ MigrateSetParameters p = {
.has_max_bandwidth = true,
.max_bandwidth = value,
};
value *= 1000; /* Convert to milliseconds */
value = MAX(0, MIN(INT64_MAX, value));
- MigrationParameters p = {
+ MigrateSetParameters p = {
.has_downtime_limit = true,
.downtime_limit = value,
};
return s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_RAM];
}
+bool migrate_postcopy(void)
+{
+ return migrate_postcopy_ram();
+}
+
bool migrate_auto_converge(void)
{
MigrationState *s;
return s->enabled_capabilities[MIGRATION_CAPABILITY_EVENTS];
}
+bool migrate_use_multifd(void)
+{
+ MigrationState *s;
+
+ s = migrate_get_current();
+
+ return s->enabled_capabilities[MIGRATION_CAPABILITY_X_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.x_multifd_channels;
+}
+
+int migrate_multifd_page_count(void)
+{
+ MigrationState *s;
+
+ s = migrate_get_current();
+
+ return s->parameters.x_multifd_page_count;
+}
+
int migrate_use_xbzrle(void)
{
MigrationState *s;
s = migrate_get_current();
- return s->xbzrle_cache_size;
+ return s->parameters.xbzrle_cache_size;
}
bool migrate_use_block(void)
* Switch from normal iteration to postcopy
* Returns non-0 on error
*/
-static int postcopy_start(MigrationState *ms, bool *old_vm_running)
+static int postcopy_start(MigrationState *ms)
{
int ret;
QIOChannelBuffer *bioc;
QEMUFile *fb;
int64_t time_at_stop = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
bool restart_block = false;
- migrate_set_state(&ms->state, MIGRATION_STATUS_ACTIVE,
- MIGRATION_STATUS_POSTCOPY_ACTIVE);
+ int cur_state = MIGRATION_STATUS_ACTIVE;
+ if (!migrate_pause_before_switchover()) {
+ migrate_set_state(&ms->state, MIGRATION_STATUS_ACTIVE,
+ MIGRATION_STATUS_POSTCOPY_ACTIVE);
+ }
trace_postcopy_start();
qemu_mutex_lock_iothread();
trace_postcopy_start_set_run();
qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
- *old_vm_running = runstate_is_running();
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;
* need to tell the destination to throw any pages it's already received
* that are dirty
*/
- if (ram_postcopy_send_discard_bitmap(ms)) {
- error_report("postcopy send discard bitmap failed");
- goto fail;
+ if (migrate_postcopy_ram()) {
+ if (ram_postcopy_send_discard_bitmap(ms)) {
+ error_report("postcopy send discard bitmap failed");
+ goto fail;
+ }
}
/*
* wrap their state up here
*/
qemu_file_set_rate_limit(ms->to_dst_file, INT64_MAX);
- /* Ping just for debugging, helps line traces up */
- qemu_savevm_send_ping(ms->to_dst_file, 2);
+ 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
qemu_savevm_send_postcopy_listen(fb);
qemu_savevm_state_complete_precopy(fb, false, false);
- qemu_savevm_send_ping(fb, 3);
+ if (migrate_postcopy_ram()) {
+ qemu_savevm_send_ping(fb, 3);
+ }
qemu_savevm_send_postcopy_run(fb);
qemu_mutex_unlock_iothread();
- /*
- * Although this ping is just for debug, it could potentially be
- * used for getting a better measurement of downtime at the source.
- */
- qemu_savevm_send_ping(ms->to_dst_file, 4);
+ if (migrate_postcopy_ram()) {
+ /*
+ * Although this ping is just for debug, it could potentially be
+ * used for getting a better measurement of downtime at the source.
+ */
+ qemu_savevm_send_ping(ms->to_dst_file, 4);
+ }
if (migrate_release_ram()) {
ram_postcopy_migrated_memory_release(ms);
return -1;
}
+/**
+ * migration_maybe_pause: Pause if required to by
+ * migrate_pause_before_switchover called with the iothread locked
+ * Returns: 0 on success
+ */
+static int migration_maybe_pause(MigrationState *s,
+ int *current_active_state,
+ int new_state)
+{
+ if (!migrate_pause_before_switchover()) {
+ return 0;
+ }
+
+ /* Since leaving this state is not atomic with posting the semaphore
+ * it's possible that someone could have issued multiple migrate_continue
+ * and the semaphore is incorrectly positive at this point;
+ * the docs say it's undefined to reinit a semaphore that's already
+ * init'd, so use timedwait to eat up any existing posts.
+ */
+ while (qemu_sem_timedwait(&s->pause_sem, 1) == 0) {
+ /* This block intentionally left blank */
+ }
+
+ qemu_mutex_unlock_iothread();
+ migrate_set_state(&s->state, *current_active_state,
+ MIGRATION_STATUS_PRE_SWITCHOVER);
+ qemu_sem_wait(&s->pause_sem);
+ migrate_set_state(&s->state, MIGRATION_STATUS_PRE_SWITCHOVER,
+ new_state);
+ *current_active_state = new_state;
+ qemu_mutex_lock_iothread();
+
+ return s->state == new_state ? 0 : -EINVAL;
+}
+
/**
* migration_completion: Used by migration_thread when there's not much left.
* The caller 'breaks' the loop when this returns.
*
* @s: Current migration state
- * @current_active_state: The migration state we expect to be in
- * @*old_vm_running: Pointer to old_vm_running flag
- * @*start_time: Pointer to time to update
*/
-static void migration_completion(MigrationState *s, int current_active_state,
- bool *old_vm_running,
- int64_t *start_time)
+static void migration_completion(MigrationState *s)
{
int ret;
+ int current_active_state = s->state;
if (s->state == MIGRATION_STATUS_ACTIVE) {
qemu_mutex_lock_iothread();
- *start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
+ s->downtime_start = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
- *old_vm_running = runstate_is_running();
+ s->vm_was_running = runstate_is_running();
ret = global_state_store();
if (!ret) {
bool inactivate = !migrate_colo_enabled();
ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
+ if (ret >= 0) {
+ ret = migration_maybe_pause(s, ¤t_active_state,
+ MIGRATION_STATUS_DEVICE);
+ }
if (ret >= 0) {
qemu_file_set_rate_limit(s->to_dst_file, INT64_MAX);
ret = qemu_savevm_state_complete_precopy(s->to_dst_file, false,
return s->enabled_capabilities[MIGRATION_CAPABILITY_X_COLO];
}
+static void migration_calculate_complete(MigrationState *s)
+{
+ uint64_t bytes = qemu_ftell(s->to_dst_file);
+ int64_t end_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
+
+ s->total_time = end_time - s->start_time;
+ if (!s->downtime) {
+ /*
+ * It's still not set, so we are precopy migration. For
+ * postcopy, downtime is calculated during postcopy_start().
+ */
+ s->downtime = end_time - s->downtime_start;
+ }
+
+ if (s->total_time) {
+ s->mbps = ((double) bytes * 8.0) / s->total_time / 1000;
+ }
+}
+
+static void migration_update_counters(MigrationState *s,
+ int64_t current_time)
+{
+ uint64_t transferred, time_spent;
+ double bandwidth;
+
+ if (current_time < s->iteration_start_time + BUFFER_DELAY) {
+ return;
+ }
+
+ transferred = qemu_ftell(s->to_dst_file) - s->iteration_initial_bytes;
+ time_spent = current_time - s->iteration_start_time;
+ bandwidth = (double)transferred / time_spent;
+ s->threshold_size = bandwidth * s->parameters.downtime_limit;
+
+ s->mbps = (((double) transferred * 8.0) /
+ ((double) time_spent / 1000.0)) / 1000.0 / 1000.0;
+
+ /*
+ * if we haven't sent anything, we don't want to
+ * recalculate. 10000 is a small enough number for our purposes
+ */
+ if (ram_counters.dirty_pages_rate && transferred > 10000) {
+ s->expected_downtime = ram_counters.dirty_pages_rate *
+ qemu_target_page_size() / bandwidth;
+ }
+
+ qemu_file_reset_rate_limit(s->to_dst_file);
+
+ s->iteration_start_time = current_time;
+ s->iteration_initial_bytes = qemu_ftell(s->to_dst_file);
+
+ trace_migrate_transferred(transferred, time_spent,
+ bandwidth, s->threshold_size);
+}
+
+/* Migration thread iteration status */
+typedef enum {
+ MIG_ITERATE_RESUME, /* Resume current iteration */
+ MIG_ITERATE_SKIP, /* Skip current iteration */
+ MIG_ITERATE_BREAK, /* Break the loop */
+} MigIterateState;
+
+/*
+ * Return true if continue to the next iteration directly, false
+ * otherwise.
+ */
+static MigIterateState migration_iteration_run(MigrationState *s)
+{
+ uint64_t pending_size, pend_post, pend_nonpost;
+ bool in_postcopy = s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE;
+
+ qemu_savevm_state_pending(s->to_dst_file, s->threshold_size,
+ &pend_nonpost, &pend_post);
+ pending_size = pend_nonpost + pend_post;
+
+ trace_migrate_pending(pending_size, s->threshold_size,
+ pend_post, pend_nonpost);
+
+ if (pending_size && pending_size >= s->threshold_size) {
+ /* Still a significant amount to transfer */
+ if (migrate_postcopy() && !in_postcopy &&
+ pend_nonpost <= s->threshold_size &&
+ atomic_read(&s->start_postcopy)) {
+ if (postcopy_start(s)) {
+ error_report("%s: postcopy failed to start", __func__);
+ }
+ return MIG_ITERATE_SKIP;
+ }
+ /* Just another iteration step */
+ qemu_savevm_state_iterate(s->to_dst_file,
+ s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE);
+ } else {
+ trace_migration_thread_low_pending(pending_size);
+ migration_completion(s);
+ return MIG_ITERATE_BREAK;
+ }
+
+ return MIG_ITERATE_RESUME;
+}
+
+static void migration_iteration_finish(MigrationState *s)
+{
+ /* If we enabled cpu throttling for auto-converge, turn it off. */
+ cpu_throttle_stop();
+
+ qemu_mutex_lock_iothread();
+ switch (s->state) {
+ case MIGRATION_STATUS_COMPLETED:
+ migration_calculate_complete(s);
+ runstate_set(RUN_STATE_POSTMIGRATE);
+ break;
+
+ case MIGRATION_STATUS_ACTIVE:
+ /*
+ * We should really assert here, but since it's during
+ * migration, let's try to reduce the usage of assertions.
+ */
+ if (!migrate_colo_enabled()) {
+ error_report("%s: critical error: calling COLO code without "
+ "COLO enabled", __func__);
+ }
+ migrate_start_colo_process(s);
+ /*
+ * Fixme: we will run VM in COLO no matter its old running state.
+ * After exited COLO, we will keep running.
+ */
+ s->vm_was_running = true;
+ /* Fallthrough */
+ case MIGRATION_STATUS_FAILED:
+ case MIGRATION_STATUS_CANCELLED:
+ if (s->vm_was_running) {
+ vm_start();
+ } else {
+ if (runstate_check(RUN_STATE_FINISH_MIGRATE)) {
+ runstate_set(RUN_STATE_POSTMIGRATE);
+ }
+ }
+ break;
+
+ default:
+ /* Should not reach here, but if so, forgive the VM. */
+ error_report("%s: Unknown ending state %d", __func__, s->state);
+ break;
+ }
+ qemu_bh_schedule(s->cleanup_bh);
+ qemu_mutex_unlock_iothread();
+}
+
/*
* Master migration thread on the source VM.
* It drives the migration and pumps the data down the outgoing channel.
static void *migration_thread(void *opaque)
{
MigrationState *s = opaque;
- /* Used by the bandwidth calcs, updated later */
- 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;
- /*
- * The final stage happens when the remaining data is smaller than
- * this threshold; it's calculated from the requested downtime and
- * measured bandwidth
- */
- int64_t threshold_size = 0;
- int64_t start_time = initial_time;
- int64_t end_time;
- bool old_vm_running = false;
- bool entered_postcopy = false;
- /* The active state we expect to be in; ACTIVE or POSTCOPY_ACTIVE */
- enum MigrationStatus current_active_state = MIGRATION_STATUS_ACTIVE;
- bool enable_colo = migrate_colo_enabled();
rcu_register_thread();
+ s->iteration_start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
+
qemu_savevm_state_header(s->to_dst_file);
/*
qemu_savevm_send_ping(s->to_dst_file, 1);
}
- if (migrate_postcopy_ram()) {
+ if (migrate_postcopy()) {
/*
* Tell the destination that we *might* want to do postcopy later;
* if the other end can't do postcopy it should fail now, nice and
while (s->state == MIGRATION_STATUS_ACTIVE ||
s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) {
int64_t current_time;
- uint64_t pending_size;
if (!qemu_file_rate_limit(s->to_dst_file)) {
- uint64_t pend_post, pend_nonpost;
-
- qemu_savevm_state_pending(s->to_dst_file, threshold_size,
- &pend_nonpost, &pend_post);
- pending_size = pend_nonpost + pend_post;
- trace_migrate_pending(pending_size, threshold_size,
- pend_post, pend_nonpost);
- if (pending_size && pending_size >= threshold_size) {
- /* Still a significant amount to transfer */
-
- if (migrate_postcopy_ram() &&
- s->state != MIGRATION_STATUS_POSTCOPY_ACTIVE &&
- pend_nonpost <= threshold_size &&
- atomic_read(&s->start_postcopy)) {
-
- if (!postcopy_start(s, &old_vm_running)) {
- current_active_state = MIGRATION_STATUS_POSTCOPY_ACTIVE;
- entered_postcopy = true;
- }
-
- continue;
- }
- /* Just another iteration step */
- qemu_savevm_state_iterate(s->to_dst_file, entered_postcopy);
- } else {
- trace_migration_thread_low_pending(pending_size);
- migration_completion(s, current_active_state,
- &old_vm_running, &start_time);
+ MigIterateState iter_state = migration_iteration_run(s);
+ if (iter_state == MIG_ITERATE_SKIP) {
+ continue;
+ } else if (iter_state == MIG_ITERATE_BREAK) {
break;
}
}
if (qemu_file_get_error(s->to_dst_file)) {
- migrate_set_state(&s->state, current_active_state,
- MIGRATION_STATUS_FAILED);
+ if (migration_is_setup_or_active(s->state)) {
+ migrate_set_state(&s->state, s->state,
+ MIGRATION_STATUS_FAILED);
+ }
trace_migration_thread_file_err();
break;
}
+
current_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
- if (current_time >= initial_time + BUFFER_DELAY) {
- uint64_t transferred_bytes = qemu_ftell(s->to_dst_file) -
- initial_bytes;
- uint64_t time_spent = current_time - initial_time;
- double bandwidth = (double)transferred_bytes / time_spent;
- threshold_size = bandwidth * s->parameters.downtime_limit;
-
- s->mbps = (((double) transferred_bytes * 8.0) /
- ((double) time_spent / 1000.0)) / 1000.0 / 1000.0;
-
- trace_migrate_transferred(transferred_bytes, time_spent,
- bandwidth, threshold_size);
- /* if we haven't sent anything, we don't want to recalculate
- 10000 is a small enough number for our purposes */
- if (ram_counters.dirty_pages_rate && transferred_bytes > 10000) {
- s->expected_downtime = ram_counters.dirty_pages_rate *
- qemu_target_page_size() / bandwidth;
- }
- qemu_file_reset_rate_limit(s->to_dst_file);
- initial_time = current_time;
- initial_bytes = qemu_ftell(s->to_dst_file);
- }
+ migration_update_counters(s, current_time);
+
if (qemu_file_rate_limit(s->to_dst_file)) {
/* usleep expects microseconds */
- g_usleep((initial_time + BUFFER_DELAY - current_time)*1000);
+ g_usleep((s->iteration_start_time + BUFFER_DELAY -
+ current_time) * 1000);
}
}
trace_migration_thread_after_loop();
- /* If we enabled cpu throttling for auto-converge, turn it off. */
- cpu_throttle_stop();
- end_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
-
- qemu_mutex_lock_iothread();
- /*
- * The resource has been allocated by migration will be reused in COLO
- * process, so don't release them.
- */
- if (!enable_colo) {
- qemu_savevm_state_cleanup();
- }
- if (s->state == MIGRATION_STATUS_COMPLETED) {
- uint64_t transferred_bytes = qemu_ftell(s->to_dst_file);
- s->total_time = end_time - s->total_time;
- if (!entered_postcopy) {
- 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 (s->state == MIGRATION_STATUS_ACTIVE && enable_colo) {
- migrate_start_colo_process(s);
- qemu_savevm_state_cleanup();
- /*
- * Fixme: we will run VM in COLO no matter its old running state.
- * After exited COLO, we will keep running.
- */
- old_vm_running = true;
- }
- if (old_vm_running && !entered_postcopy) {
- vm_start();
- } else {
- if (runstate_check(RUN_STATE_FINISH_MIGRATE)) {
- runstate_set(RUN_STATE_POSTMIGRATE);
- }
- }
- }
- qemu_bh_schedule(s->cleanup_bh);
- qemu_mutex_unlock_iothread();
-
+ migration_iteration_finish(s);
rcu_unregister_thread();
return NULL;
}
-void migrate_fd_connect(MigrationState *s)
+void migrate_fd_connect(MigrationState *s, Error *error_in)
{
s->expected_downtime = s->parameters.downtime_limit;
s->cleanup_bh = qemu_bh_new(migrate_fd_cleanup, s);
+ if (error_in) {
+ migrate_fd_error(s, error_in);
+ migrate_fd_cleanup(s);
+ return;
+ }
qemu_file_set_blocking(s->to_dst_file, true);
qemu_file_set_rate_limit(s->to_dst_file,
}
}
+ if (multifd_save_setup() != 0) {
+ migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
+ MIGRATION_STATUS_FAILED);
+ migrate_fd_cleanup(s);
+ return;
+ }
qemu_thread_create(&s->thread, "live_migration", migration_thread, s,
QEMU_THREAD_JOINABLE);
s->migration_thread_running = true;
{
MigrationState *ms = migrate_get_current();
- monitor_printf(mon, "globals: store-global-state=%d, only_migratable=%d, "
- "send-configuration=%d, send-section-footer=%d\n",
- ms->store_global_state, ms->only_migratable,
- ms->send_configuration, ms->send_section_footer);
+ monitor_printf(mon, "globals:\n");
+ monitor_printf(mon, "store-global-state: %s\n",
+ ms->store_global_state ? "on" : "off");
+ monitor_printf(mon, "only-migratable: %s\n",
+ ms->only_migratable ? "on" : "off");
+ monitor_printf(mon, "send-configuration: %s\n",
+ ms->send_configuration ? "on" : "off");
+ monitor_printf(mon, "send-section-footer: %s\n",
+ ms->send_section_footer ? "on" : "off");
}
#define DEFINE_PROP_MIG_CAP(name, x) \
send_section_footer, true),
/* Migration parameters */
- DEFINE_PROP_INT64("x-compress-level", MigrationState,
+ DEFINE_PROP_UINT8("x-compress-level", MigrationState,
parameters.compress_level,
DEFAULT_MIGRATE_COMPRESS_LEVEL),
- DEFINE_PROP_INT64("x-compress-threads", MigrationState,
+ DEFINE_PROP_UINT8("x-compress-threads", MigrationState,
parameters.compress_threads,
DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT),
- DEFINE_PROP_INT64("x-decompress-threads", MigrationState,
+ DEFINE_PROP_UINT8("x-decompress-threads", MigrationState,
parameters.decompress_threads,
DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT),
- DEFINE_PROP_INT64("x-cpu-throttle-initial", MigrationState,
+ DEFINE_PROP_UINT8("x-cpu-throttle-initial", MigrationState,
parameters.cpu_throttle_initial,
DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL),
- DEFINE_PROP_INT64("x-cpu-throttle-increment", MigrationState,
+ DEFINE_PROP_UINT8("x-cpu-throttle-increment", MigrationState,
parameters.cpu_throttle_increment,
DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT),
- DEFINE_PROP_INT64("x-max-bandwidth", MigrationState,
+ DEFINE_PROP_SIZE("x-max-bandwidth", MigrationState,
parameters.max_bandwidth, MAX_THROTTLE),
- DEFINE_PROP_INT64("x-downtime-limit", MigrationState,
+ DEFINE_PROP_UINT64("x-downtime-limit", MigrationState,
parameters.downtime_limit,
DEFAULT_MIGRATE_SET_DOWNTIME),
- DEFINE_PROP_INT64("x-checkpoint-delay", MigrationState,
+ DEFINE_PROP_UINT32("x-checkpoint-delay", MigrationState,
parameters.x_checkpoint_delay,
DEFAULT_MIGRATE_X_CHECKPOINT_DELAY),
+ DEFINE_PROP_UINT8("x-multifd-channels", MigrationState,
+ parameters.x_multifd_channels,
+ DEFAULT_MIGRATE_MULTIFD_CHANNELS),
+ DEFINE_PROP_UINT32("x-multifd-page-count", MigrationState,
+ parameters.x_multifd_page_count,
+ DEFAULT_MIGRATE_MULTIFD_PAGE_COUNT),
+ DEFINE_PROP_SIZE("xbzrle-cache-size", MigrationState,
+ parameters.xbzrle_cache_size,
+ DEFAULT_MIGRATE_XBZRLE_CACHE_SIZE),
/* Migration capabilities */
DEFINE_PROP_MIG_CAP("x-xbzrle", MIGRATION_CAPABILITY_XBZRLE),
DEFINE_PROP_MIG_CAP("x-release-ram", MIGRATION_CAPABILITY_RELEASE_RAM),
DEFINE_PROP_MIG_CAP("x-block", MIGRATION_CAPABILITY_BLOCK),
DEFINE_PROP_MIG_CAP("x-return-path", MIGRATION_CAPABILITY_RETURN_PATH),
+ DEFINE_PROP_MIG_CAP("x-multifd", MIGRATION_CAPABILITY_X_MULTIFD),
DEFINE_PROP_END_OF_LIST(),
};
dc->props = migration_properties;
}
+static void migration_instance_finalize(Object *obj)
+{
+ MigrationState *ms = MIGRATION_OBJ(obj);
+ MigrationParameters *params = &ms->parameters;
+
+ qemu_mutex_destroy(&ms->error_mutex);
+ g_free(params->tls_hostname);
+ g_free(params->tls_creds);
+ qemu_sem_destroy(&ms->pause_sem);
+}
+
static void migration_instance_init(Object *obj)
{
MigrationState *ms = MIGRATION_OBJ(obj);
MigrationParameters *params = &ms->parameters;
ms->state = MIGRATION_STATUS_NONE;
- ms->xbzrle_cache_size = DEFAULT_MIGRATE_CACHE_SIZE;
ms->mbps = -1;
+ qemu_sem_init(&ms->pause_sem, 0);
+ qemu_mutex_init(&ms->error_mutex);
params->tls_hostname = g_strdup("");
params->tls_creds = g_strdup("");
params->has_downtime_limit = true;
params->has_x_checkpoint_delay = true;
params->has_block_incremental = true;
+ params->has_x_multifd_channels = true;
+ params->has_x_multifd_page_count = true;
+ params->has_xbzrle_cache_size = true;
}
/*
.class_size = sizeof(MigrationClass),
.instance_size = sizeof(MigrationState),
.instance_init = migration_instance_init,
+ .instance_finalize = migration_instance_finalize,
};
static void register_migration_types(void)
projects / qemu.git / blobdiff