#include "qemu/osdep.h"
#include "qemu/cutils.h"
#include "qemu/error-report.h"
-#include "qemu/main-loop.h"
#include "migration/blocker.h"
-#include "migration/migration.h"
+#include "exec.h"
+#include "fd.h"
+#include "socket.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-channel.h"
-#include "migration/qemu-file.h"
+#include "qemu-file.h"
#include "migration/vmstate.h"
-#include "sysemu/sysemu.h"
#include "block/block.h"
#include "qapi/qmp/qerror.h"
-#include "qapi/util.h"
-#include "qemu/sockets.h"
#include "qemu/rcu.h"
-#include "migration/block.h"
+#include "block.h"
#include "postcopy-ram.h"
#include "qemu/thread.h"
#include "qmp-commands.h"
#include "trace.h"
#include "qapi-event.h"
-#include "qom/cpu.h"
-#include "exec/memory.h"
-#include "exec/address-spaces.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 "monitor/monitor.h"
#define MAX_THROTTLE (32 << 20) /* Migration transfer speed throttling */
#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 bool deferred_incoming;
+/* 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_MAX
+};
+
/* 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;
+
+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)
{
- static bool once;
- static MigrationState current_migration = {
- .state = MIGRATION_STATUS_NONE,
- .xbzrle_cache_size = DEFAULT_MIGRATE_CACHE_SIZE,
- .mbps = -1,
- .parameters = {
- .compress_level = DEFAULT_MIGRATE_COMPRESS_LEVEL,
- .compress_threads = DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT,
- .decompress_threads = DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT,
- .cpu_throttle_initial = DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL,
- .cpu_throttle_increment = DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT,
- .max_bandwidth = MAX_THROTTLE,
- .downtime_limit = DEFAULT_MIGRATE_SET_DOWNTIME,
- .x_checkpoint_delay = DEFAULT_MIGRATE_X_CHECKPOINT_DELAY,
- },
- };
+ MachineState *ms = MACHINE(qdev_get_machine());
+ Error *err = NULL;
- if (!once) {
- current_migration.parameters.tls_creds = g_strdup("");
- current_migration.parameters.tls_hostname = g_strdup("");
- once = true;
+ /* This can only be called once. */
+ assert(!current_migration);
+ current_migration = MIGRATION_OBJ(object_new(TYPE_MIGRATION));
+
+ if (!migration_object_check(current_migration, &err)) {
+ error_report_err(err);
+ exit(1);
+ }
+
+ /*
+ * We cannot really do this in migration_instance_init() since at
+ * that time global properties are not yet applied, then this
+ * value will be definitely replaced by something else.
+ */
+ if (ms->enforce_config_section) {
+ current_migration->send_configuration = true;
}
- return ¤t_migration;
+}
+
+void migration_object_finalize(void)
+{
+ object_unref(OBJECT(current_migration));
+}
+
+/* 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)
if (!once) {
mis_current.state = MIGRATION_STATUS_NONE;
memset(&mis_current, 0, sizeof(MigrationIncomingState));
- QLIST_INIT(&mis_current.loadvm_handlers);
qemu_mutex_init(&mis_current.rp_mutex);
qemu_event_init(&mis_current.main_thread_load_event, false);
once = true;
{
struct MigrationIncomingState *mis = migration_incoming_get_current();
- qemu_event_destroy(&mis->main_thread_load_event);
- loadvm_free_handlers(mis);
-}
-
-
-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 (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 state is running or paused, it is not needed */
-
- if (strcmp(runstate, "running") == 0 ||
- strcmp(runstate, "paused") == 0) {
- return false;
+ if (mis->from_src_file) {
+ qemu_fclose(mis->from_src_file);
+ mis->from_src_file = NULL;
}
- /* 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);
+ qemu_event_reset(&mis->main_thread_load_event);
}
static void migrate_generate_event(int new_state)
deferred_incoming = true;
}
+/*
+ * Send a message on the return channel back to the source
+ * of the migration.
+ */
+static void migrate_send_rp_message(MigrationIncomingState *mis,
+ enum mig_rp_message_type message_type,
+ uint16_t len, void *data)
+{
+ trace_migrate_send_rp_message((int)message_type, len);
+ qemu_mutex_lock(&mis->rp_mutex);
+ 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);
+ qemu_mutex_unlock(&mis->rp_mutex);
+}
+
/* Request a range of pages from the source VM at the given
* start address.
* rbname: Name of the RAMBlock to request the page in, if NULL it's the same
*/
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. */
} else {
runstate_set(global_state_get_runstate());
}
- migrate_decompress_threads_join();
/*
* 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
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));
- migrate_decompress_threads_join();
+ qemu_fclose(mis->from_src_file);
+ if (multifd_load_cleanup(&local_err) != 0) {
+ error_report_err(local_err);
+ }
exit(EXIT_FAILURE);
}
-
- qemu_fclose(f);
- free_xbzrle_decoded_buf();
-
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();
- migrate_decompress_threads_create();
+ 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);
}
-/*
- * Send a message on the return channel back to the source
- * of the migration.
+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.
*/
-void migrate_send_rp_message(MigrationIncomingState *mis,
- enum mig_rp_message_type message_type,
- uint16_t len, void *data)
+bool migration_has_all_channels(void)
{
- trace_migrate_send_rp_message((int)message_type, len);
- qemu_mutex_lock(&mis->rp_mutex);
- 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);
- qemu_mutex_unlock(&mis->rp_mutex);
+ return true;
}
/*
continue;
}
#endif
- if (i == MIGRATION_CAPABILITY_X_COLO && !colo_supported()) {
- continue;
- }
if (head == NULL) {
head = g_malloc0(sizeof(*caps));
caps = head;
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:
}
}
-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();
- }
-}
-
static void populate_ram_info(MigrationInfo *info, MigrationState *s)
{
info->has_ram = true;
info->ram = g_malloc0(sizeof(*info->ram));
- info->ram->transferred = ram_bytes_transferred();
+ info->ram->transferred = ram_counters.transferred;
info->ram->total = ram_bytes_total();
- info->ram->duplicate = dup_mig_pages_transferred();
+ info->ram->duplicate = ram_counters.duplicate;
/* legacy value. It is not used anymore */
info->ram->skipped = 0;
- info->ram->normal = norm_mig_pages_transferred();
- info->ram->normal_bytes = norm_mig_pages_transferred() *
+ info->ram->normal = ram_counters.normal;
+ info->ram->normal_bytes = ram_counters.normal *
qemu_target_page_size();
info->ram->mbps = s->mbps;
- info->ram->dirty_sync_count = ram_dirty_sync_count();
- info->ram->postcopy_requests = ram_postcopy_requests();
+ info->ram->dirty_sync_count = ram_counters.dirty_sync_count;
+ info->ram->postcopy_requests = ram_counters.postcopy_requests;
info->ram->page_size = qemu_target_page_size();
+ if (migrate_use_xbzrle()) {
+ info->has_xbzrle_cache = true;
+ info->xbzrle_cache = g_malloc0(sizeof(*info->xbzrle_cache));
+ info->xbzrle_cache->cache_size = migrate_xbzrle_cache_size();
+ info->xbzrle_cache->bytes = xbzrle_counters.bytes;
+ info->xbzrle_cache->pages = xbzrle_counters.pages;
+ info->xbzrle_cache->cache_miss = xbzrle_counters.cache_miss;
+ info->xbzrle_cache->cache_miss_rate = xbzrle_counters.cache_miss_rate;
+ info->xbzrle_cache->overflow = xbzrle_counters.overflow;
+ }
+
+ if (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_dirty_pages_rate();
+ 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();
}
}
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;
-
- populate_ram_info(info, s);
-
- 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();
- }
-
- if (cpu_throttle_active()) {
- info->has_cpu_throttle_percentage = true;
- info->cpu_throttle_percentage = cpu_throttle_get_percentage();
- }
-
- get_xbzrle_cache_stats(info);
- break;
case MIGRATION_STATUS_POSTCOPY_ACTIVE:
- /* Mostly the same as active; TODO add some postcopy stats */
+ 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;
info->setup_time = s->setup_time;
populate_ram_info(info, s);
-
- 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);
+ populate_disk_info(info);
break;
case MIGRATION_STATUS_COLO:
info->has_status = true;
/* TODO: display COLO specific information (checkpoint info etc.) */
break;
case MIGRATION_STATUS_COMPLETED:
- get_xbzrle_cache_stats(info);
-
info->has_status = true;
info->has_total_time = true;
info->total_time = s->total_time;
return info;
}
-void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params,
- Error **errp)
+/**
+ * @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)
{
- MigrationState *s = migrate_get_current();
MigrationCapabilityStatusList *cap;
- bool old_postcopy_cap = migrate_postcopy_ram();
+ bool old_postcopy_cap;
+ MigrationIncomingState *mis = migration_incoming_get_current();
- if (migration_is_setup_or_active(s->state)) {
- error_setg(errp, QERR_MIGRATION_ACTIVE);
- return;
- }
+ 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->value->capability == MIGRATION_CAPABILITY_BLOCK
- && cap->value->state) {
- error_setg(errp, "QEMU compiled without old-style (blk/-b, inc/-i) "
- "block migration");
- error_append_hint(errp, "Use drive_mirror+NBD instead.\n");
- continue;
- }
-#endif
- if (cap->value->capability == MIGRATION_CAPABILITY_X_COLO) {
- if (!colo_supported()) {
- error_setg(errp, "COLO is not currently supported, please"
- " configure with --enable-colo option in order to"
- " support COLO feature");
- continue;
- }
- }
- s->enabled_capabilities[cap->value->capability] = cap->value->state;
+ 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
- if (migrate_postcopy_ram()) {
- if (migrate_use_compression()) {
+ if (cap_list[MIGRATION_CAPABILITY_POSTCOPY_RAM]) {
+ if (cap_list[MIGRATION_CAPABILITY_COMPRESS]) {
/* The decompression threads asynchronously write into RAM
* rather than use the atomic copies needed to avoid
* userfaulting. It should be possible to fix the decompression
* threads for compatibility in future.
*/
- error_report("Postcopy is not currently compatible with "
- "compression");
- s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_RAM] =
- false;
+ error_setg(errp, "Postcopy is not currently compatible "
+ "with compression");
+ return false;
}
+
/* This check is reasonably expensive, so only when it's being
* set the first time, also it's only the destination that needs
* special support.
*/
if (!old_postcopy_cap && runstate_check(RUN_STATE_INMIGRATE) &&
- !postcopy_ram_supported_by_host()) {
+ !postcopy_ram_supported_by_host(mis)) {
/* postcopy_ram_supported_by_host will have emitted a more
* detailed message
*/
- error_report("Postcopy is not supported");
- s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_RAM] =
- false;
+ error_setg(errp, "Postcopy is not supported");
+ return false;
}
}
+
+ return true;
}
-void qmp_migrate_set_parameters(MigrationParameters *params, Error **errp)
+void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params,
+ Error **errp)
{
MigrationState *s = migrate_get_current();
+ MigrationCapabilityStatusList *cap;
+
+ if (migration_is_setup_or_active(s->state)) {
+ error_setg(errp, QERR_MIGRATION_ACTIVE);
+ return;
+ }
+
+ if (!migrate_caps_check(s->enabled_capabilities, 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 < 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;
+ 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;
+ 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;
+ 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;
+ 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;
+ 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;
+ 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;
+ 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_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_compress_threads) {
s->parameters.compress_threads = params->compress_threads;
}
+
if (params->has_decompress_threads) {
s->parameters.decompress_threads = params->decompress_threads;
}
+
if (params->has_cpu_throttle_initial) {
s->parameters.cpu_throttle_initial = params->cpu_throttle_initial;
}
+
if (params->has_cpu_throttle_increment) {
s->parameters.cpu_throttle_increment = params->cpu_throttle_increment;
}
+
if (params->has_tls_creds) {
g_free(s->parameters.tls_creds);
- 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) {
s->parameters.max_bandwidth = params->max_bandwidth;
if (s->to_dst_file) {
s->parameters.max_bandwidth / XFER_LIMIT_RATIO);
}
}
+
if (params->has_downtime_limit) {
s->parameters.downtime_limit = params->downtime_limit;
}
colo_checkpoint_notify(s);
}
}
+
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(MigrateSetParameters *params, Error **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, 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);
}
}
-void migrate_set_block_enabled(bool value, Error **errp)
+static MigrationCapabilityStatusList *migrate_cap_add(
+ MigrationCapabilityStatusList *list,
+ MigrationCapability index,
+ bool state)
{
MigrationCapabilityStatusList *cap;
cap = g_new0(MigrationCapabilityStatusList, 1);
cap->value = g_new0(MigrationCapabilityStatus, 1);
- cap->value->capability = MIGRATION_CAPABILITY_BLOCK;
- cap->value->state = value;
+ cap->value->capability = index;
+ cap->value->state = state;
+ cap->next = list;
+
+ return cap;
+}
+
+void migrate_set_block_enabled(bool value, Error **errp)
+{
+ MigrationCapabilityStatusList *cap;
+
+ cap = migrate_cap_add(NULL, MIGRATION_CAPABILITY_BLOCK, value);
qmp_migrate_set_capabilities(cap, errp);
qapi_free_MigrationCapabilityStatusList(cap);
}
qemu_bh_delete(s->cleanup_bh);
s->cleanup_bh = NULL;
- migration_page_queue_free();
+ 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();
- migrate_compress_threads_join();
+ 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;
}
int migrate_add_blocker(Error *reason, Error **errp)
{
- if (only_migratable) {
+ if (migrate_get_current()->only_migratable) {
error_propagate(errp, error_copy(reason));
error_prepend(errp, "disallowing migration blocker "
"(--only_migratable) for: ");
}
if (migration_blockers) {
- *errp = error_copy(migration_blockers->data);
+ error_propagate(errp, error_copy(migration_blockers->data));
return true;
}
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)
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;
* 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;
* Cause any non-postcopiable, but iterative devices to
* send out their final data.
*/
- qemu_savevm_state_complete_precopy(ms->to_dst_file, true);
+ qemu_savevm_state_complete_precopy(ms->to_dst_file, true, false);
/*
* in Finish migrate and with the io-lock held everything should
* 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);
- qemu_savevm_send_ping(fb, 3);
+ qemu_savevm_state_complete_precopy(fb, false, false);
+ 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);
- /*
- * Don't mark the image with BDRV_O_INACTIVE flag if
- * we will go into COLO stage later.
- */
- if (ret >= 0 && !migrate_colo_enabled()) {
- ret = bdrv_inactivate_all();
+ 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);
- qemu_savevm_state_complete_precopy(s->to_dst_file, false);
+ ret = qemu_savevm_state_complete_precopy(s->to_dst_file, false,
+ inactivate);
+ }
+ if (inactivate && ret >= 0) {
s->block_inactive = true;
}
}
* cleaning everything else up (since if there are no failures
* it will wait for the destination to send it's status in
* a SHUT command).
- * Postcopy opens rp if enabled (even if it's not avtivated)
*/
- if (migrate_postcopy_ram()) {
+ if (s->rp_state.from_dst_file) {
int rp_error;
- trace_migration_completion_postcopy_end_before_rp();
+ trace_migration_return_path_end_before();
rp_error = await_return_path_close_on_source(s);
- trace_migration_completion_postcopy_end_after_rp(rp_error);
+ trace_migration_return_path_end_after(rp_error);
if (rp_error) {
goto fail_invalidate;
}
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);
- if (migrate_postcopy_ram()) {
+ /*
+ * If we opened the return path, we need to make sure dst has it
+ * opened as well.
+ */
+ if (s->rp_state.from_dst_file) {
/* Now tell the dest that it should open its end so it can reply */
qemu_savevm_send_open_return_path(s->to_dst_file);
/* And do a ping that will make stuff easier to debug */
qemu_savevm_send_ping(s->to_dst_file, 1);
+ }
+ if (migrate_postcopy()) {
/*
* Tell the destination that we *might* want to do postcopy later;
* if the other end can't do postcopy it should fail now, nice and
qemu_savevm_send_postcopy_advise(s->to_dst_file);
}
- qemu_savevm_state_begin(s->to_dst_file);
+ qemu_savevm_state_setup(s->to_dst_file);
s->setup_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) - setup_start;
migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
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_dirty_pages_rate() && transferred_bytes > 10000) {
- s->expected_downtime = ram_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,
notifier_list_notify(&migration_state_notifiers, s);
/*
- * Open the return path; currently for postcopy but other things might
- * also want it.
+ * Open the return path. For postcopy, it is used exclusively. For
+ * precopy, only if user specified "return-path" capability would
+ * QEMU uses the return path.
*/
- if (migrate_postcopy_ram()) {
+ if (migrate_postcopy_ram() || migrate_use_return_path()) {
if (open_return_path_on_source(s)) {
error_report("Unable to open return-path for postcopy");
migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
}
}
- migrate_compress_threads_create();
+ if (multifd_save_setup() != 0) {
+ migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
+ MIGRATION_STATUS_FAILED);
+ migrate_fd_cleanup(s);
+ return;
+ }
qemu_thread_create(&s->thread, "live_migration", migration_thread, s,
QEMU_THREAD_JOINABLE);
s->migration_thread_running = true;
}
+void migration_global_dump(Monitor *mon)
+{
+ MigrationState *ms = migrate_get_current();
+
+ monitor_printf(mon, "globals:\n");
+ monitor_printf(mon, "store-global-state: %s\n",
+ ms->store_global_state ? "on" : "off");
+ monitor_printf(mon, "only-migratable: %s\n",
+ 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) \
+ DEFINE_PROP_BOOL(name, MigrationState, enabled_capabilities[x], false)
+
+static Property migration_properties[] = {
+ DEFINE_PROP_BOOL("store-global-state", MigrationState,
+ store_global_state, true),
+ DEFINE_PROP_BOOL("only-migratable", MigrationState, only_migratable, false),
+ DEFINE_PROP_BOOL("send-configuration", MigrationState,
+ send_configuration, true),
+ DEFINE_PROP_BOOL("send-section-footer", MigrationState,
+ send_section_footer, true),
+
+ /* Migration parameters */
+ DEFINE_PROP_UINT8("x-compress-level", MigrationState,
+ parameters.compress_level,
+ DEFAULT_MIGRATE_COMPRESS_LEVEL),
+ DEFINE_PROP_UINT8("x-compress-threads", MigrationState,
+ parameters.compress_threads,
+ DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT),
+ DEFINE_PROP_UINT8("x-decompress-threads", MigrationState,
+ parameters.decompress_threads,
+ DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT),
+ DEFINE_PROP_UINT8("x-cpu-throttle-initial", MigrationState,
+ parameters.cpu_throttle_initial,
+ DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL),
+ DEFINE_PROP_UINT8("x-cpu-throttle-increment", MigrationState,
+ parameters.cpu_throttle_increment,
+ DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT),
+ DEFINE_PROP_SIZE("x-max-bandwidth", MigrationState,
+ parameters.max_bandwidth, MAX_THROTTLE),
+ DEFINE_PROP_UINT64("x-downtime-limit", MigrationState,
+ parameters.downtime_limit,
+ DEFAULT_MIGRATE_SET_DOWNTIME),
+ DEFINE_PROP_UINT32("x-checkpoint-delay", MigrationState,
+ parameters.x_checkpoint_delay,
+ DEFAULT_MIGRATE_X_CHECKPOINT_DELAY),
+ DEFINE_PROP_UINT8("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-rdma-pin-all", MIGRATION_CAPABILITY_RDMA_PIN_ALL),
+ DEFINE_PROP_MIG_CAP("x-auto-converge", MIGRATION_CAPABILITY_AUTO_CONVERGE),
+ DEFINE_PROP_MIG_CAP("x-zero-blocks", MIGRATION_CAPABILITY_ZERO_BLOCKS),
+ DEFINE_PROP_MIG_CAP("x-compress", MIGRATION_CAPABILITY_COMPRESS),
+ DEFINE_PROP_MIG_CAP("x-events", MIGRATION_CAPABILITY_EVENTS),
+ DEFINE_PROP_MIG_CAP("x-postcopy-ram", MIGRATION_CAPABILITY_POSTCOPY_RAM),
+ DEFINE_PROP_MIG_CAP("x-colo", MIGRATION_CAPABILITY_X_COLO),
+ DEFINE_PROP_MIG_CAP("x-release-ram", MIGRATION_CAPABILITY_RELEASE_RAM),
+ DEFINE_PROP_MIG_CAP("x-block", MIGRATION_CAPABILITY_BLOCK),
+ DEFINE_PROP_MIG_CAP("x-return-path", MIGRATION_CAPABILITY_RETURN_PATH),
+ DEFINE_PROP_MIG_CAP("x-multifd", MIGRATION_CAPABILITY_X_MULTIFD),
+
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+static void migration_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+
+ dc->user_creatable = false;
+ dc->props = migration_properties;
+}
+
+static void migration_instance_finalize(Object *obj)
+{
+ MigrationState *ms = MIGRATION_OBJ(obj);
+ MigrationParameters *params = &ms->parameters;
+
+ qemu_mutex_destroy(&ms->error_mutex);
+ 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->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("");
+
+ /* Set has_* up only for parameter checks */
+ params->has_compress_level = true;
+ params->has_compress_threads = true;
+ params->has_decompress_threads = true;
+ params->has_cpu_throttle_initial = true;
+ params->has_cpu_throttle_increment = true;
+ params->has_max_bandwidth = true;
+ params->has_downtime_limit = true;
+ params->has_x_checkpoint_delay = true;
+ params->has_block_incremental = true;
+ params->has_x_multifd_channels = true;
+ params->has_x_multifd_page_count = true;
+ params->has_xbzrle_cache_size = true;
+}
+
+/*
+ * Return true if check pass, false otherwise. Error will be put
+ * inside errp if provided.
+ */
+static bool migration_object_check(MigrationState *ms, Error **errp)
+{
+ MigrationCapabilityStatusList *head = NULL;
+ /* Assuming all off */
+ bool cap_list[MIGRATION_CAPABILITY__MAX] = { 0 }, ret;
+ int i;
+
+ if (!migrate_params_check(&ms->parameters, errp)) {
+ return false;
+ }
+
+ for (i = 0; i < MIGRATION_CAPABILITY__MAX; i++) {
+ if (ms->enabled_capabilities[i]) {
+ head = migrate_cap_add(head, i, true);
+ }
+ }
+
+ ret = migrate_caps_check(cap_list, head, errp);
+
+ /* It works with head == NULL */
+ qapi_free_MigrationCapabilityStatusList(head);
+
+ return ret;
+}
+
+static const TypeInfo migration_type = {
+ .name = TYPE_MIGRATION,
+ /*
+ * NOTE: TYPE_MIGRATION is not really a device, as the object is
+ * not created using qdev_create(), it is not attached to the qdev
+ * device tree, and it is never realized.
+ *
+ * TODO: Make this TYPE_OBJECT once QOM provides something like
+ * TYPE_DEVICE's "-global" properties.
+ */
+ .parent = TYPE_DEVICE,
+ .class_init = migration_class_init,
+ .class_size = sizeof(MigrationClass),
+ .instance_size = sizeof(MigrationState),
+ .instance_init = migration_instance_init,
+ .instance_finalize = migration_instance_finalize,
+};
+
+static void register_migration_types(void)
+{
+ type_register_static(&migration_type);
+}
+
+type_init(register_migration_types);
projects / qemu.git / blobdiff