*/
#include "qemu-common.h"
+#include "qemu/error-report.h"
#include "qemu/main-loop.h"
#include "migration/migration.h"
-#include "monitor/monitor.h"
#include "migration/qemu-file.h"
#include "sysemu/sysemu.h"
#include "block/block.h"
+#include "qapi/qmp/qerror.h"
#include "qemu/sockets.h"
+#include "qemu/rcu.h"
#include "migration/block.h"
#include "qemu/thread.h"
#include "qmp-commands.h"
#include "trace.h"
+#include "qapi/util.h"
+#include "qapi-event.h"
#define MAX_THROTTLE (32 << 20) /* Migration speed throttling */
#define BUFFER_DELAY 100
#define XFER_LIMIT_RATIO (1000 / BUFFER_DELAY)
+/* Default compression thread count */
+#define DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT 8
+/* Default decompression thread count, usually decompression is at
+ * least 4 times as fast as compression.*/
+#define DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT 2
+/*0: means nocompress, 1: best speed, ... 9: best compress ratio */
+#define DEFAULT_MIGRATE_COMPRESS_LEVEL 1
+
/* Migration XBZRLE default cache size */
#define DEFAULT_MIGRATE_CACHE_SIZE (64 * 1024 * 1024)
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 = {
.bandwidth_limit = MAX_THROTTLE,
.xbzrle_cache_size = DEFAULT_MIGRATE_CACHE_SIZE,
.mbps = -1,
+ .parameters[MIGRATION_PARAMETER_COMPRESS_LEVEL] =
+ DEFAULT_MIGRATE_COMPRESS_LEVEL,
+ .parameters[MIGRATION_PARAMETER_COMPRESS_THREADS] =
+ DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT,
+ .parameters[MIGRATION_PARAMETER_DECOMPRESS_THREADS] =
+ DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT,
};
return ¤t_migration;
}
+/* For incoming */
+static MigrationIncomingState *mis_current;
+
+MigrationIncomingState *migration_incoming_get_current(void)
+{
+ return mis_current;
+}
+
+MigrationIncomingState *migration_incoming_state_new(QEMUFile* f)
+{
+ mis_current = g_malloc0(sizeof(MigrationIncomingState));
+ mis_current->file = f;
+ QLIST_INIT(&mis_current->loadvm_handlers);
+
+ return mis_current;
+}
+
+void migration_incoming_state_destroy(void)
+{
+ loadvm_free_handlers(mis_current);
+ g_free(mis_current);
+ mis_current = NULL;
+}
+
+
+typedef struct {
+ bool optional;
+ uint32_t size;
+ uint8_t runstate[100];
+ RunState state;
+ bool received;
+} GlobalState;
+
+static GlobalState global_state;
+
+int global_state_store(void)
+{
+ if (!runstate_store((char *)global_state.runstate,
+ sizeof(global_state.runstate))) {
+ error_report("runstate name too big: %s", global_state.runstate);
+ trace_migrate_state_too_big();
+ return -EINVAL;
+ }
+ return 0;
+}
+
+void global_state_store_running(void)
+{
+ const char *state = RunState_lookup[RUN_STATE_RUNNING];
+ strncpy((char *)global_state.runstate,
+ state, sizeof(global_state.runstate));
+}
+
+static bool global_state_received(void)
+{
+ return global_state.received;
+}
+
+static RunState global_state_get_runstate(void)
+{
+ return global_state.state;
+}
+
+void global_state_set_optional(void)
+{
+ global_state.optional = true;
+}
+
+static bool global_state_needed(void *opaque)
+{
+ GlobalState *s = opaque;
+ char *runstate = (char *)s->runstate;
+
+ /* If it is not optional, it is mandatory */
+
+ if (s->optional == false) {
+ return true;
+ }
+
+ /* If state is running or paused, it is not needed */
+
+ if (strcmp(runstate, "running") == 0 ||
+ strcmp(runstate, "paused") == 0) {
+ return false;
+ }
+
+ /* for any other state it is needed */
+ return true;
+}
+
+static int global_state_post_load(void *opaque, int version_id)
+{
+ GlobalState *s = opaque;
+ Error *local_err = NULL;
+ int r;
+ char *runstate = (char *)s->runstate;
+
+ s->received = true;
+ trace_migrate_global_state_post_load(runstate);
+
+ r = qapi_enum_parse(RunState_lookup, runstate, RUN_STATE_MAX,
+ -1, &local_err);
+
+ if (r == -1) {
+ if (local_err) {
+ error_report_err(local_err);
+ }
+ return -EINVAL;
+ }
+ s->state = r;
+
+ return 0;
+}
+
+static void global_state_pre_save(void *opaque)
+{
+ GlobalState *s = opaque;
+
+ trace_migrate_global_state_pre_save((char *)s->runstate);
+ s->size = strlen((char *)s->runstate) + 1;
+}
+
+static const VMStateDescription vmstate_globalstate = {
+ .name = "globalstate",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .post_load = global_state_post_load,
+ .pre_save = global_state_pre_save,
+ .needed = global_state_needed,
+ .fields = (VMStateField[]) {
+ VMSTATE_UINT32(size, GlobalState),
+ VMSTATE_BUFFER(runstate, GlobalState),
+ VMSTATE_END_OF_LIST()
+ },
+};
+
+void register_global_state(void)
+{
+ /* We would use it independently that we receive it */
+ strcpy((char *)&global_state.runstate, "");
+ global_state.received = false;
+ vmstate_register(NULL, 0, &vmstate_globalstate, &global_state);
+}
+
+static void migrate_generate_event(int new_state)
+{
+ if (migrate_use_events()) {
+ qapi_event_send_migration(new_state, &error_abort);
+ }
+}
+
/*
* Called on -incoming with a defer: uri.
* The migration can be started later after any parameters have been
{
const char *p;
+ qapi_event_send_migration(MIGRATION_STATUS_SETUP, &error_abort);
if (!strcmp(uri, "defer")) {
deferred_incoming_migration(errp);
} else if (strstart(uri, "tcp:", &p)) {
Error *local_err = NULL;
int ret;
+ migration_incoming_state_new(f);
+ migrate_generate_event(MIGRATION_STATUS_ACTIVE);
ret = qemu_loadvm_state(f);
+
qemu_fclose(f);
free_xbzrle_decoded_buf();
+ migration_incoming_state_destroy();
+
if (ret < 0) {
+ migrate_generate_event(MIGRATION_STATUS_FAILED);
error_report("load of migration failed: %s", strerror(-ret));
+ migrate_decompress_threads_join();
exit(EXIT_FAILURE);
}
+ migrate_generate_event(MIGRATION_STATUS_COMPLETED);
qemu_announce_self();
/* Make sure all file formats flush their mutable metadata */
bdrv_invalidate_cache_all(&local_err);
if (local_err) {
error_report_err(local_err);
+ migrate_decompress_threads_join();
exit(EXIT_FAILURE);
}
- if (autostart) {
- vm_start();
+ /* If global state section was not received or we are in running
+ state, we need to obey autostart. Any other state is set with
+ runstate_set. */
+
+ if (!global_state_received() ||
+ global_state_get_runstate() == RUN_STATE_RUNNING) {
+ if (autostart) {
+ vm_start();
+ } else {
+ runstate_set(RUN_STATE_PAUSED);
+ }
} else {
- runstate_set(RUN_STATE_PAUSED);
+ runstate_set(global_state_get_runstate());
}
+ migrate_decompress_threads_join();
}
void process_incoming_migration(QEMUFile *f)
int fd = qemu_get_fd(f);
assert(fd != -1);
+ migrate_decompress_threads_create();
qemu_set_nonblock(fd);
qemu_coroutine_enter(co, f);
}
return head;
}
+MigrationParameters *qmp_query_migrate_parameters(Error **errp)
+{
+ MigrationParameters *params;
+ MigrationState *s = migrate_get_current();
+
+ params = g_malloc0(sizeof(*params));
+ params->compress_level = s->parameters[MIGRATION_PARAMETER_COMPRESS_LEVEL];
+ params->compress_threads =
+ s->parameters[MIGRATION_PARAMETER_COMPRESS_THREADS];
+ params->decompress_threads =
+ s->parameters[MIGRATION_PARAMETER_DECOMPRESS_THREADS];
+
+ return params;
+}
+
static void get_xbzrle_cache_stats(MigrationInfo *info)
{
if (migrate_use_xbzrle()) {
if (s->state == MIGRATION_STATUS_ACTIVE ||
s->state == MIGRATION_STATUS_SETUP) {
- error_set(errp, QERR_MIGRATION_ACTIVE);
+ error_setg(errp, QERR_MIGRATION_ACTIVE);
return;
}
}
}
+void qmp_migrate_set_parameters(bool has_compress_level,
+ int64_t compress_level,
+ bool has_compress_threads,
+ int64_t compress_threads,
+ bool has_decompress_threads,
+ int64_t decompress_threads, Error **errp)
+{
+ MigrationState *s = migrate_get_current();
+
+ if (has_compress_level && (compress_level < 0 || compress_level > 9)) {
+ error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "compress_level",
+ "is invalid, it should be in the range of 0 to 9");
+ return;
+ }
+ if (has_compress_threads &&
+ (compress_threads < 1 || compress_threads > 255)) {
+ error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
+ "compress_threads",
+ "is invalid, it should be in the range of 1 to 255");
+ return;
+ }
+ if (has_decompress_threads &&
+ (decompress_threads < 1 || decompress_threads > 255)) {
+ error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
+ "decompress_threads",
+ "is invalid, it should be in the range of 1 to 255");
+ return;
+ }
+
+ if (has_compress_level) {
+ s->parameters[MIGRATION_PARAMETER_COMPRESS_LEVEL] = compress_level;
+ }
+ if (has_compress_threads) {
+ s->parameters[MIGRATION_PARAMETER_COMPRESS_THREADS] = compress_threads;
+ }
+ if (has_decompress_threads) {
+ s->parameters[MIGRATION_PARAMETER_DECOMPRESS_THREADS] =
+ decompress_threads;
+ }
+}
+
/* shared migration helpers */
static void migrate_set_state(MigrationState *s, int old_state, int new_state)
{
- if (atomic_cmpxchg(&s->state, old_state, new_state) == new_state) {
+ if (atomic_cmpxchg(&s->state, old_state, new_state) == old_state) {
trace_migrate_set_state(new_state);
+ migrate_generate_event(new_state);
}
}
qemu_thread_join(&s->thread);
qemu_mutex_lock_iothread();
+ migrate_compress_threads_join();
qemu_fclose(s->file);
s->file = NULL;
}
{
trace_migrate_fd_error();
assert(s->file == NULL);
- s->state = MIGRATION_STATUS_FAILED;
- trace_migrate_set_state(MIGRATION_STATUS_FAILED);
+ migrate_set_state(s, MIGRATION_STATUS_SETUP, MIGRATION_STATUS_FAILED);
notifier_list_notify(&migration_state_notifiers, s);
}
int64_t bandwidth_limit = s->bandwidth_limit;
bool enabled_capabilities[MIGRATION_CAPABILITY_MAX];
int64_t xbzrle_cache_size = s->xbzrle_cache_size;
+ int compress_level = s->parameters[MIGRATION_PARAMETER_COMPRESS_LEVEL];
+ int compress_thread_count =
+ s->parameters[MIGRATION_PARAMETER_COMPRESS_THREADS];
+ int decompress_thread_count =
+ s->parameters[MIGRATION_PARAMETER_DECOMPRESS_THREADS];
memcpy(enabled_capabilities, s->enabled_capabilities,
sizeof(enabled_capabilities));
sizeof(enabled_capabilities));
s->xbzrle_cache_size = xbzrle_cache_size;
+ s->parameters[MIGRATION_PARAMETER_COMPRESS_LEVEL] = compress_level;
+ s->parameters[MIGRATION_PARAMETER_COMPRESS_THREADS] =
+ compress_thread_count;
+ s->parameters[MIGRATION_PARAMETER_DECOMPRESS_THREADS] =
+ decompress_thread_count;
s->bandwidth_limit = bandwidth_limit;
- s->state = MIGRATION_STATUS_SETUP;
- trace_migrate_set_state(MIGRATION_STATUS_SETUP);
+ migrate_set_state(s, MIGRATION_STATUS_NONE, MIGRATION_STATUS_SETUP);
s->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
return s;
if (s->state == MIGRATION_STATUS_ACTIVE ||
s->state == MIGRATION_STATUS_SETUP ||
s->state == MIGRATION_STATUS_CANCELLING) {
- error_set(errp, QERR_MIGRATION_ACTIVE);
+ error_setg(errp, QERR_MIGRATION_ACTIVE);
return;
}
-
if (runstate_check(RUN_STATE_INMIGRATE)) {
error_setg(errp, "Guest is waiting for an incoming migration");
return;
return;
}
+ /* We are starting a new migration, so we want to start in a clean
+ state. This change is only needed if previous migration
+ failed/was cancelled. We don't use migrate_set_state() because
+ we are setting the initial state, not changing it. */
+ s->state = MIGRATION_STATUS_NONE;
+
s = migrate_init(¶ms);
if (strstart(uri, "tcp:", &p)) {
fd_start_outgoing_migration(s, p, &local_err);
#endif
} else {
- error_set(errp, QERR_INVALID_PARAMETER_VALUE, "uri", "a valid migration protocol");
- s->state = MIGRATION_STATUS_FAILED;
+ error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "uri",
+ "a valid migration protocol");
+ migrate_set_state(s, MIGRATION_STATUS_SETUP, MIGRATION_STATUS_FAILED);
return;
}
/* Check for truncation */
if (value != (size_t)value) {
- error_set(errp, QERR_INVALID_PARAMETER_VALUE, "cache size",
- "exceeding address space");
+ 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_set(errp, QERR_INVALID_PARAMETER_VALUE, "cache size",
- "exceeds guest ram size ");
+ error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size",
+ "exceeds guest ram size ");
return;
}
new_size = xbzrle_cache_resize(value);
if (new_size < 0) {
- error_set(errp, QERR_INVALID_PARAMETER_VALUE, "cache size",
- "is smaller than page size");
+ error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size",
+ "is smaller than page size");
return;
}
return s->enabled_capabilities[MIGRATION_CAPABILITY_ZERO_BLOCKS];
}
+bool migrate_use_compression(void)
+{
+ MigrationState *s;
+
+ s = migrate_get_current();
+
+ return s->enabled_capabilities[MIGRATION_CAPABILITY_COMPRESS];
+}
+
+int migrate_compress_level(void)
+{
+ MigrationState *s;
+
+ s = migrate_get_current();
+
+ return s->parameters[MIGRATION_PARAMETER_COMPRESS_LEVEL];
+}
+
+int migrate_compress_threads(void)
+{
+ MigrationState *s;
+
+ s = migrate_get_current();
+
+ return s->parameters[MIGRATION_PARAMETER_COMPRESS_THREADS];
+}
+
+int migrate_decompress_threads(void)
+{
+ MigrationState *s;
+
+ s = migrate_get_current();
+
+ return s->parameters[MIGRATION_PARAMETER_DECOMPRESS_THREADS];
+}
+
+bool migrate_use_events(void)
+{
+ MigrationState *s;
+
+ s = migrate_get_current();
+
+ return s->enabled_capabilities[MIGRATION_CAPABILITY_EVENTS];
+}
+
int migrate_use_xbzrle(void)
{
MigrationState *s;
return s->xbzrle_cache_size;
}
+/**
+ * migration_completion: Used by migration_thread when there's not much left.
+ * The caller 'breaks' the loop when this returns.
+ *
+ * @s: Current migration state
+ * @*old_vm_running: Pointer to old_vm_running flag
+ * @*start_time: Pointer to time to update
+ */
+static void migration_completion(MigrationState *s, bool *old_vm_running,
+ int64_t *start_time)
+{
+ int ret;
+
+ qemu_mutex_lock_iothread();
+ *start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
+ qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
+ *old_vm_running = runstate_is_running();
+
+ ret = global_state_store();
+ if (!ret) {
+ ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
+ if (ret >= 0) {
+ qemu_file_set_rate_limit(s->file, INT64_MAX);
+ qemu_savevm_state_complete(s->file);
+ }
+ }
+ qemu_mutex_unlock_iothread();
+
+ if (ret < 0) {
+ goto fail;
+ }
+
+ if (qemu_file_get_error(s->file)) {
+ trace_migration_completion_file_err();
+ goto fail;
+ }
+
+ migrate_set_state(s, MIGRATION_STATUS_ACTIVE, MIGRATION_STATUS_COMPLETED);
+ return;
+
+fail:
+ migrate_set_state(s, MIGRATION_STATUS_ACTIVE, MIGRATION_STATUS_FAILED);
+}
+
/* migration thread support */
static void *migration_thread(void *opaque)
int64_t start_time = initial_time;
bool old_vm_running = false;
+ rcu_register_thread();
+
+ qemu_savevm_state_header(s->file);
qemu_savevm_state_begin(s->file, &s->params);
s->setup_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) - setup_start;
if (pending_size && pending_size >= max_size) {
qemu_savevm_state_iterate(s->file);
} else {
- int ret;
-
- qemu_mutex_lock_iothread();
- start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
- qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
- old_vm_running = runstate_is_running();
-
- ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
- if (ret >= 0) {
- qemu_file_set_rate_limit(s->file, INT64_MAX);
- qemu_savevm_state_complete(s->file);
- }
- qemu_mutex_unlock_iothread();
-
- if (ret < 0) {
- migrate_set_state(s, MIGRATION_STATUS_ACTIVE,
- MIGRATION_STATUS_FAILED);
- break;
- }
-
- if (!qemu_file_get_error(s->file)) {
- migrate_set_state(s, MIGRATION_STATUS_ACTIVE,
- MIGRATION_STATUS_COMPLETED);
- break;
- }
+ trace_migration_thread_low_pending(pending_size);
+ migration_completion(s, &old_vm_running, &start_time);
+ break;
}
}
qemu_bh_schedule(s->cleanup_bh);
qemu_mutex_unlock_iothread();
+ rcu_unregister_thread();
return NULL;
}
void migrate_fd_connect(MigrationState *s)
{
- s->state = MIGRATION_STATUS_SETUP;
- trace_migrate_set_state(MIGRATION_STATUS_SETUP);
-
/* This is a best 1st approximation. ns to ms */
s->expected_downtime = max_downtime/1000000;
s->cleanup_bh = qemu_bh_new(migrate_fd_cleanup, s);
/* Notify before starting migration thread */
notifier_list_notify(&migration_state_notifiers, s);
+ migrate_compress_threads_create();
qemu_thread_create(&s->thread, "migration", migration_thread, s,
QEMU_THREAD_JOINABLE);
}
projects / qemu.git / blobdiff