*/
#include "qemu-common.h"
-#include "migration.h"
-#include "monitor.h"
-#include "buffered_file.h"
-#include "sysemu.h"
-#include "block.h"
-#include "qemu_socket.h"
-#include "block-migration.h"
+#include "migration/migration.h"
+#include "monitor/monitor.h"
+#include "migration/qemu-file.h"
+#include "sysemu/sysemu.h"
+#include "block/block.h"
+#include "qemu/sockets.h"
+#include "migration/block.h"
+#include "qemu/thread.h"
#include "qmp-commands.h"
//#define DEBUG_MIGRATION
#define MAX_THROTTLE (32 << 20) /* Migration speed throttling */
+/* Amount of time to allocate to each "chunk" of bandwidth-throttled
+ * data. */
+#define BUFFER_DELAY 100
+#define XFER_LIMIT_RATIO (1000 / BUFFER_DELAY)
+
+/* Migration XBZRLE default cache size */
+#define DEFAULT_MIGRATE_CACHE_SIZE (64 * 1024 * 1024)
+
static NotifierList migration_state_notifiers =
NOTIFIER_LIST_INITIALIZER(migration_state_notifiers);
migrations at once. For now we don't need to add
dynamic creation of migration */
-static MigrationState *migrate_get_current(void)
+MigrationState *migrate_get_current(void)
{
static MigrationState current_migration = {
.state = MIG_STATE_SETUP,
.bandwidth_limit = MAX_THROTTLE,
+ .xbzrle_cache_size = DEFAULT_MIGRATE_CACHE_SIZE,
};
return ¤t_migration;
}
-int qemu_start_incoming_migration(const char *uri, Error **errp)
+void qemu_start_incoming_migration(const char *uri, Error **errp)
{
const char *p;
- int ret;
if (strstart(uri, "tcp:", &p))
- ret = tcp_start_incoming_migration(p, errp);
+ tcp_start_incoming_migration(p, errp);
#if !defined(WIN32)
else if (strstart(uri, "exec:", &p))
- ret = exec_start_incoming_migration(p);
+ exec_start_incoming_migration(p, errp);
else if (strstart(uri, "unix:", &p))
- ret = unix_start_incoming_migration(p);
+ unix_start_incoming_migration(p, errp);
else if (strstart(uri, "fd:", &p))
- ret = fd_start_incoming_migration(p);
+ fd_start_incoming_migration(p, errp);
#endif
else {
- fprintf(stderr, "unknown migration protocol: %s\n", uri);
- ret = -EPROTONOSUPPORT;
+ error_setg(errp, "unknown migration protocol: %s", uri);
}
- return ret;
}
-void process_incoming_migration(QEMUFile *f)
+static void process_incoming_migration_co(void *opaque)
{
- if (qemu_loadvm_state(f) < 0) {
+ QEMUFile *f = opaque;
+ int ret;
+
+ ret = qemu_loadvm_state(f);
+ qemu_fclose(f);
+ if (ret < 0) {
fprintf(stderr, "load of migration failed\n");
exit(0);
}
if (autostart) {
vm_start();
} else {
- runstate_set(RUN_STATE_PRELAUNCH);
+ runstate_set(RUN_STATE_PAUSED);
}
}
+void process_incoming_migration(QEMUFile *f)
+{
+ Coroutine *co = qemu_coroutine_create(process_incoming_migration_co);
+ int fd = qemu_get_fd(f);
+
+ assert(fd != -1);
+ socket_set_nonblock(fd);
+ qemu_coroutine_enter(co, f);
+}
+
/* amount of nanoseconds we are willing to wait for migration to be down.
* the choice of nanoseconds is because it is the maximum resolution that
* get_clock() can achieve. It is an internal measure. All user-visible
return max_downtime;
}
+MigrationCapabilityStatusList *qmp_query_migrate_capabilities(Error **errp)
+{
+ MigrationCapabilityStatusList *head = NULL;
+ MigrationCapabilityStatusList *caps;
+ MigrationState *s = migrate_get_current();
+ int i;
+
+ for (i = 0; i < MIGRATION_CAPABILITY_MAX; i++) {
+ if (head == NULL) {
+ head = g_malloc0(sizeof(*caps));
+ caps = head;
+ } else {
+ caps->next = g_malloc0(sizeof(*caps));
+ caps = caps->next;
+ }
+ caps->value =
+ g_malloc(sizeof(*caps->value));
+ caps->value->capability = i;
+ caps->value->state = s->enabled_capabilities[i];
+ }
+
+ return head;
+}
+
+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->overflow = xbzrle_mig_pages_overflow();
+ }
+}
+
MigrationInfo *qmp_query_migrate(Error **errp)
{
MigrationInfo *info = g_malloc0(sizeof(*info));
case MIG_STATE_ACTIVE:
info->has_status = true;
info->status = g_strdup("active");
+ info->has_total_time = true;
+ info->total_time = qemu_get_clock_ms(rt_clock)
+ - s->total_time;
+ info->has_expected_downtime = true;
+ info->expected_downtime = s->expected_downtime;
info->has_ram = true;
info->ram = g_malloc0(sizeof(*info->ram));
info->ram->transferred = ram_bytes_transferred();
info->ram->remaining = ram_bytes_remaining();
info->ram->total = ram_bytes_total();
- info->ram->total_time = qemu_get_clock_ms(rt_clock)
- - s->total_time;
+ info->ram->duplicate = dup_mig_pages_transferred();
+ info->ram->normal = norm_mig_pages_transferred();
+ info->ram->normal_bytes = norm_mig_bytes_transferred();
+ info->ram->dirty_pages_rate = s->dirty_pages_rate;
+
if (blk_mig_active()) {
info->has_disk = true;
info->disk->remaining = blk_mig_bytes_remaining();
info->disk->total = blk_mig_bytes_total();
}
+
+ get_xbzrle_cache_stats(info);
break;
case MIG_STATE_COMPLETED:
+ get_xbzrle_cache_stats(info);
+
info->has_status = true;
info->status = g_strdup("completed");
+ info->total_time = s->total_time;
+ info->has_downtime = true;
+ info->downtime = s->downtime;
info->has_ram = true;
info->ram = g_malloc0(sizeof(*info->ram));
info->ram->transferred = ram_bytes_transferred();
info->ram->remaining = 0;
info->ram->total = ram_bytes_total();
- info->ram->total_time = s->total_time;
+ info->ram->duplicate = dup_mig_pages_transferred();
+ info->ram->normal = norm_mig_pages_transferred();
+ info->ram->normal_bytes = norm_mig_bytes_transferred();
break;
case MIG_STATE_ERROR:
info->has_status = true;
return info;
}
+void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params,
+ Error **errp)
+{
+ MigrationState *s = migrate_get_current();
+ MigrationCapabilityStatusList *cap;
+
+ if (s->state == MIG_STATE_ACTIVE) {
+ error_set(errp, QERR_MIGRATION_ACTIVE);
+ return;
+ }
+
+ for (cap = params; cap; cap = cap->next) {
+ s->enabled_capabilities[cap->value->capability] = cap->value->state;
+ }
+}
+
/* shared migration helpers */
static int migrate_fd_cleanup(MigrationState *s)
{
int ret = 0;
- qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
-
if (s->file) {
DPRINTF("closing file\n");
ret = qemu_fclose(s->file);
s->file = NULL;
}
- if (s->fd != -1) {
- close(s->fd);
- s->fd = -1;
- }
-
+ assert(s->fd == -1);
return ret;
}
notifier_list_notify(&migration_state_notifiers, s);
}
-static void migrate_fd_put_notify(void *opaque)
-{
- MigrationState *s = opaque;
-
- qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
- qemu_file_put_notify(s->file);
- if (s->file && qemu_file_get_error(s->file)) {
- migrate_fd_error(s);
- }
-}
-
-static ssize_t migrate_fd_put_buffer(void *opaque, const void *data,
+static ssize_t migrate_fd_put_buffer(MigrationState *s, const void *data,
size_t size)
{
- MigrationState *s = opaque;
ssize_t ret;
if (s->state != MIG_STATE_ACTIVE) {
if (ret == -1)
ret = -(s->get_error(s));
- if (ret == -EAGAIN) {
- qemu_set_fd_handler2(s->fd, NULL, NULL, migrate_fd_put_notify, s);
- }
-
return ret;
}
-static void migrate_fd_put_ready(void *opaque)
-{
- MigrationState *s = opaque;
- int ret;
-
- if (s->state != MIG_STATE_ACTIVE) {
- DPRINTF("put_ready returning because of non-active state\n");
- return;
- }
-
- DPRINTF("iterate\n");
- ret = qemu_savevm_state_iterate(s->file);
- if (ret < 0) {
- migrate_fd_error(s);
- } else if (ret == 1) {
- int old_vm_running = runstate_is_running();
-
- DPRINTF("done iterating\n");
- qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
- vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
-
- if (qemu_savevm_state_complete(s->file) < 0) {
- migrate_fd_error(s);
- } else {
- migrate_fd_completed(s);
- }
- s->total_time = qemu_get_clock_ms(rt_clock) - s->total_time;
- if (s->state != MIG_STATE_COMPLETED) {
- if (old_vm_running) {
- vm_start();
- }
- }
- }
-}
-
static void migrate_fd_cancel(MigrationState *s)
{
if (s->state != MIG_STATE_ACTIVE)
s->state = MIG_STATE_CANCELLED;
notifier_list_notify(&migration_state_notifiers, s);
- qemu_savevm_state_cancel(s->file);
+ qemu_savevm_state_cancel();
migrate_fd_cleanup(s);
}
-static void migrate_fd_wait_for_unfreeze(void *opaque)
+int migrate_fd_close(MigrationState *s)
{
- MigrationState *s = opaque;
- int ret;
-
- DPRINTF("wait for unfreeze\n");
- if (s->state != MIG_STATE_ACTIVE)
- return;
-
- do {
- fd_set wfds;
-
- FD_ZERO(&wfds);
- FD_SET(s->fd, &wfds);
-
- ret = select(s->fd + 1, NULL, &wfds, NULL, NULL);
- } while (ret == -1 && (s->get_error(s)) == EINTR);
-
- if (ret == -1) {
- qemu_file_set_error(s->file, -s->get_error(s));
+ int rc = 0;
+ if (s->fd != -1) {
+ rc = s->close(s);
+ s->fd = -1;
}
-}
-
-static int migrate_fd_close(void *opaque)
-{
- MigrationState *s = opaque;
-
- qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
- return s->close(s);
+ return rc;
}
void add_migration_state_change_notifier(Notifier *notify)
s->state == MIG_STATE_ERROR);
}
-void migrate_fd_connect(MigrationState *s)
-{
- int ret;
-
- s->state = MIG_STATE_ACTIVE;
- s->file = qemu_fopen_ops_buffered(s,
- s->bandwidth_limit,
- migrate_fd_put_buffer,
- migrate_fd_put_ready,
- migrate_fd_wait_for_unfreeze,
- migrate_fd_close);
-
- DPRINTF("beginning savevm\n");
- ret = qemu_savevm_state_begin(s->file, &s->params);
- if (ret < 0) {
- DPRINTF("failed, %d\n", ret);
- migrate_fd_error(s);
- return;
- }
- migrate_fd_put_ready(s);
-}
-
static MigrationState *migrate_init(const MigrationParams *params)
{
MigrationState *s = migrate_get_current();
int64_t bandwidth_limit = s->bandwidth_limit;
+ bool enabled_capabilities[MIGRATION_CAPABILITY_MAX];
+ int64_t xbzrle_cache_size = s->xbzrle_cache_size;
+
+ memcpy(enabled_capabilities, s->enabled_capabilities,
+ sizeof(enabled_capabilities));
memset(s, 0, sizeof(*s));
s->bandwidth_limit = bandwidth_limit;
s->params = *params;
+ memcpy(s->enabled_capabilities, enabled_capabilities,
+ sizeof(enabled_capabilities));
+ s->xbzrle_cache_size = xbzrle_cache_size;
s->bandwidth_limit = bandwidth_limit;
s->state = MIG_STATE_SETUP;
bool has_inc, bool inc, bool has_detach, bool detach,
Error **errp)
{
+ Error *local_err = NULL;
MigrationState *s = migrate_get_current();
MigrationParams params;
const char *p;
- int ret;
params.blk = blk;
params.shared = inc;
s = migrate_init(¶ms);
if (strstart(uri, "tcp:", &p)) {
- ret = tcp_start_outgoing_migration(s, p, errp);
+ tcp_start_outgoing_migration(s, p, &local_err);
#if !defined(WIN32)
} else if (strstart(uri, "exec:", &p)) {
- ret = exec_start_outgoing_migration(s, p);
+ exec_start_outgoing_migration(s, p, &local_err);
} else if (strstart(uri, "unix:", &p)) {
- ret = unix_start_outgoing_migration(s, p);
+ unix_start_outgoing_migration(s, p, &local_err);
} else if (strstart(uri, "fd:", &p)) {
- ret = fd_start_outgoing_migration(s, p);
+ fd_start_outgoing_migration(s, p, &local_err);
#endif
} else {
error_set(errp, QERR_INVALID_PARAMETER_VALUE, "uri", "a valid migration protocol");
return;
}
- if (ret < 0) {
- if (!error_is_set(errp)) {
- DPRINTF("migration failed: %s\n", strerror(-ret));
- /* FIXME: we should return meaningful errors */
- error_set(errp, QERR_UNDEFINED_ERROR);
- }
+ if (local_err) {
+ migrate_fd_error(s);
+ error_propagate(errp, local_err);
return;
}
-
- notifier_list_notify(&migration_state_notifiers, s);
}
void qmp_migrate_cancel(Error **errp)
migrate_fd_cancel(migrate_get_current());
}
+void qmp_migrate_set_cache_size(int64_t value, Error **errp)
+{
+ MigrationState *s = migrate_get_current();
+
+ /* Check for truncation */
+ if (value != (size_t)value) {
+ error_set(errp, QERR_INVALID_PARAMETER_VALUE, "cache size",
+ "exceeding address space");
+ return;
+ }
+
+ s->xbzrle_cache_size = xbzrle_cache_resize(value);
+}
+
+int64_t qmp_query_migrate_cache_size(Error **errp)
+{
+ return migrate_xbzrle_cache_size();
+}
+
void qmp_migrate_set_speed(int64_t value, Error **errp)
{
MigrationState *s;
value = MAX(0, MIN(UINT64_MAX, value));
max_downtime = (uint64_t)value;
}
+
+int migrate_use_xbzrle(void)
+{
+ MigrationState *s;
+
+ s = migrate_get_current();
+
+ return s->enabled_capabilities[MIGRATION_CAPABILITY_XBZRLE];
+}
+
+int64_t migrate_xbzrle_cache_size(void)
+{
+ MigrationState *s;
+
+ s = migrate_get_current();
+
+ return s->xbzrle_cache_size;
+}
+
+/* migration thread support */
+
+
+static ssize_t buffered_flush(MigrationState *s)
+{
+ size_t offset = 0;
+ ssize_t ret = 0;
+
+ DPRINTF("flushing %zu byte(s) of data\n", s->buffer_size);
+
+ while (s->bytes_xfer < s->xfer_limit && offset < s->buffer_size) {
+ size_t to_send = MIN(s->buffer_size - offset, s->xfer_limit - s->bytes_xfer);
+ ret = migrate_fd_put_buffer(s, s->buffer + offset, to_send);
+ if (ret <= 0) {
+ DPRINTF("error flushing data, %zd\n", ret);
+ break;
+ } else {
+ DPRINTF("flushed %zd byte(s)\n", ret);
+ offset += ret;
+ s->bytes_xfer += ret;
+ }
+ }
+
+ DPRINTF("flushed %zu of %zu byte(s)\n", offset, s->buffer_size);
+ memmove(s->buffer, s->buffer + offset, s->buffer_size - offset);
+ s->buffer_size -= offset;
+
+ if (ret < 0) {
+ return ret;
+ }
+ return offset;
+}
+
+static int buffered_put_buffer(void *opaque, const uint8_t *buf,
+ int64_t pos, int size)
+{
+ MigrationState *s = opaque;
+ ssize_t error;
+
+ DPRINTF("putting %d bytes at %" PRId64 "\n", size, pos);
+
+ error = qemu_file_get_error(s->file);
+ if (error) {
+ DPRINTF("flush when error, bailing: %s\n", strerror(-error));
+ return error;
+ }
+
+ if (size <= 0) {
+ return size;
+ }
+
+ if (size > (s->buffer_capacity - s->buffer_size)) {
+ DPRINTF("increasing buffer capacity from %zu by %zu\n",
+ s->buffer_capacity, size + 1024);
+
+ s->buffer_capacity += size + 1024;
+
+ s->buffer = g_realloc(s->buffer, s->buffer_capacity);
+ }
+
+ memcpy(s->buffer + s->buffer_size, buf, size);
+ s->buffer_size += size;
+
+ return size;
+}
+
+static int buffered_close(void *opaque)
+{
+ MigrationState *s = opaque;
+ ssize_t ret = 0;
+ int ret2;
+
+ DPRINTF("closing\n");
+
+ s->xfer_limit = INT_MAX;
+ while (!qemu_file_get_error(s->file) && s->buffer_size) {
+ ret = buffered_flush(s);
+ if (ret < 0) {
+ break;
+ }
+ }
+
+ ret2 = migrate_fd_close(s);
+ if (ret >= 0) {
+ ret = ret2;
+ }
+ s->complete = true;
+ return ret;
+}
+
+static int buffered_get_fd(void *opaque)
+{
+ MigrationState *s = opaque;
+
+ return s->fd;
+}
+
+/*
+ * The meaning of the return values is:
+ * 0: We can continue sending
+ * 1: Time to stop
+ * negative: There has been an error
+ */
+static int buffered_rate_limit(void *opaque)
+{
+ MigrationState *s = opaque;
+ int ret;
+
+ ret = qemu_file_get_error(s->file);
+ if (ret) {
+ return ret;
+ }
+
+ if (s->bytes_xfer >= s->xfer_limit) {
+ return 1;
+ }
+
+ return 0;
+}
+
+static int64_t buffered_set_rate_limit(void *opaque, int64_t new_rate)
+{
+ MigrationState *s = opaque;
+ if (qemu_file_get_error(s->file)) {
+ goto out;
+ }
+ if (new_rate > SIZE_MAX) {
+ new_rate = SIZE_MAX;
+ }
+
+ s->xfer_limit = new_rate / XFER_LIMIT_RATIO;
+
+out:
+ return s->xfer_limit;
+}
+
+static int64_t buffered_get_rate_limit(void *opaque)
+{
+ MigrationState *s = opaque;
+
+ return s->xfer_limit;
+}
+
+static void *buffered_file_thread(void *opaque)
+{
+ MigrationState *s = opaque;
+ int64_t initial_time = qemu_get_clock_ms(rt_clock);
+ int64_t max_size = 0;
+ bool last_round = false;
+ int ret;
+
+ qemu_mutex_lock_iothread();
+ DPRINTF("beginning savevm\n");
+ ret = qemu_savevm_state_begin(s->file, &s->params);
+ if (ret < 0) {
+ DPRINTF("failed, %d\n", ret);
+ qemu_mutex_unlock_iothread();
+ goto out;
+ }
+ qemu_mutex_unlock_iothread();
+
+ while (true) {
+ int64_t current_time = qemu_get_clock_ms(rt_clock);
+ uint64_t pending_size;
+
+ qemu_mutex_lock_iothread();
+ if (s->state != MIG_STATE_ACTIVE) {
+ DPRINTF("put_ready returning because of non-active state\n");
+ qemu_mutex_unlock_iothread();
+ break;
+ }
+ if (s->complete) {
+ qemu_mutex_unlock_iothread();
+ break;
+ }
+ if (s->bytes_xfer < s->xfer_limit) {
+ DPRINTF("iterate\n");
+ pending_size = qemu_savevm_state_pending(s->file, max_size);
+ DPRINTF("pending size %lu max %lu\n", pending_size, max_size);
+ if (pending_size && pending_size >= max_size) {
+ ret = qemu_savevm_state_iterate(s->file);
+ if (ret < 0) {
+ qemu_mutex_unlock_iothread();
+ break;
+ }
+ } else {
+ int old_vm_running = runstate_is_running();
+ int64_t start_time, end_time;
+
+ DPRINTF("done iterating\n");
+ start_time = qemu_get_clock_ms(rt_clock);
+ qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
+ if (old_vm_running) {
+ vm_stop(RUN_STATE_FINISH_MIGRATE);
+ } else {
+ vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
+ }
+ ret = qemu_savevm_state_complete(s->file);
+ if (ret < 0) {
+ qemu_mutex_unlock_iothread();
+ break;
+ } else {
+ migrate_fd_completed(s);
+ }
+ end_time = qemu_get_clock_ms(rt_clock);
+ s->total_time = end_time - s->total_time;
+ s->downtime = end_time - start_time;
+ if (s->state != MIG_STATE_COMPLETED) {
+ if (old_vm_running) {
+ vm_start();
+ }
+ }
+ last_round = true;
+ }
+ }
+ qemu_mutex_unlock_iothread();
+ if (current_time >= initial_time + BUFFER_DELAY) {
+ uint64_t transferred_bytes = s->bytes_xfer;
+ uint64_t time_spent = current_time - initial_time;
+ double bandwidth = transferred_bytes / time_spent;
+ max_size = bandwidth * migrate_max_downtime() / 1000000;
+
+ DPRINTF("transferred %" PRIu64 " time_spent %" PRIu64
+ " bandwidth %g max_size %" PRId64 "\n",
+ transferred_bytes, time_spent, bandwidth, max_size);
+
+ s->bytes_xfer = 0;
+ initial_time = current_time;
+ }
+ if (!last_round && (s->bytes_xfer >= s->xfer_limit)) {
+ /* usleep expects microseconds */
+ g_usleep((initial_time + BUFFER_DELAY - current_time)*1000);
+ }
+ ret = buffered_flush(s);
+ if (ret < 0) {
+ break;
+ }
+ }
+
+out:
+ if (ret < 0) {
+ migrate_fd_error(s);
+ }
+ g_free(s->buffer);
+ return NULL;
+}
+
+static const QEMUFileOps buffered_file_ops = {
+ .get_fd = buffered_get_fd,
+ .put_buffer = buffered_put_buffer,
+ .close = buffered_close,
+ .rate_limit = buffered_rate_limit,
+ .get_rate_limit = buffered_get_rate_limit,
+ .set_rate_limit = buffered_set_rate_limit,
+};
+
+void migrate_fd_connect(MigrationState *s)
+{
+ s->state = MIG_STATE_ACTIVE;
+ s->bytes_xfer = 0;
+ s->buffer = NULL;
+ s->buffer_size = 0;
+ s->buffer_capacity = 0;
+
+ s->xfer_limit = s->bandwidth_limit / XFER_LIMIT_RATIO;
+ s->complete = false;
+
+ s->file = qemu_fopen_ops(s, &buffered_file_ops);
+
+ qemu_thread_create(&s->thread, buffered_file_thread, s,
+ QEMU_THREAD_DETACHED);
+ notifier_list_notify(&migration_state_notifiers, s);
+}
projects / qemu.git / blobdiff