#include "block.h"
#include "qemu_socket.h"
#include "block-migration.h"
-#include "qemu-objects.h"
+#include "qmp-commands.h"
//#define DEBUG_MIGRATION
do { } while (0)
#endif
-/* Migration speed throttling */
-static int64_t max_throttle = (32 << 20);
+enum {
+ MIG_STATE_ERROR,
+ MIG_STATE_SETUP,
+ MIG_STATE_CANCELLED,
+ MIG_STATE_ACTIVE,
+ MIG_STATE_COMPLETED,
+};
-static MigrationState *current_migration;
+#define MAX_THROTTLE (32 << 20) /* Migration speed throttling */
static NotifierList migration_state_notifiers =
NOTIFIER_LIST_INITIALIZER(migration_state_notifiers);
+/* When we add fault tolerance, we could have several
+ migrations at once. For now we don't need to add
+ dynamic creation of migration */
+
+static MigrationState *migrate_get_current(void)
+{
+ static MigrationState current_migration = {
+ .state = MIG_STATE_SETUP,
+ .bandwidth_limit = MAX_THROTTLE,
+ };
+
+ return ¤t_migration;
+}
+
int qemu_start_incoming_migration(const char *uri)
{
const char *p;
qemu_announce_self();
DPRINTF("successfully loaded vm state\n");
- incoming_expected = false;
+ /* Make sure all file formats flush their mutable metadata */
+ bdrv_invalidate_cache_all();
- if (autostart)
+ if (autostart) {
vm_start();
-}
-
-int do_migrate(Monitor *mon, const QDict *qdict, QObject **ret_data)
-{
- MigrationState *s = NULL;
- const char *p;
- int detach = qdict_get_try_bool(qdict, "detach", 0);
- int blk = qdict_get_try_bool(qdict, "blk", 0);
- int inc = qdict_get_try_bool(qdict, "inc", 0);
- const char *uri = qdict_get_str(qdict, "uri");
-
- if (current_migration &&
- current_migration->get_status(current_migration) == MIG_STATE_ACTIVE) {
- monitor_printf(mon, "migration already in progress\n");
- return -1;
- }
-
- if (qemu_savevm_state_blocked(mon)) {
- return -1;
- }
-
- if (strstart(uri, "tcp:", &p)) {
- s = tcp_start_outgoing_migration(mon, p, max_throttle, detach,
- blk, inc);
-#if !defined(WIN32)
- } else if (strstart(uri, "exec:", &p)) {
- s = exec_start_outgoing_migration(mon, p, max_throttle, detach,
- blk, inc);
- } else if (strstart(uri, "unix:", &p)) {
- s = unix_start_outgoing_migration(mon, p, max_throttle, detach,
- blk, inc);
- } else if (strstart(uri, "fd:", &p)) {
- s = fd_start_outgoing_migration(mon, p, max_throttle, detach,
- blk, inc);
-#endif
} else {
- monitor_printf(mon, "unknown migration protocol: %s\n", uri);
- return -1;
- }
-
- if (s == NULL) {
- monitor_printf(mon, "migration failed\n");
- return -1;
- }
-
- if (current_migration) {
- current_migration->release(current_migration);
+ runstate_set(RUN_STATE_PRELAUNCH);
}
-
- current_migration = s;
- notifier_list_notify(&migration_state_notifiers, NULL);
- return 0;
-}
-
-int do_migrate_cancel(Monitor *mon, const QDict *qdict, QObject **ret_data)
-{
- MigrationState *s = current_migration;
-
- if (s)
- s->cancel(s);
-
- return 0;
-}
-
-int do_migrate_set_speed(Monitor *mon, const QDict *qdict, QObject **ret_data)
-{
- int64_t d;
- FdMigrationState *s;
-
- d = qdict_get_int(qdict, "value");
- if (d < 0) {
- d = 0;
- }
- max_throttle = d;
-
- s = migrate_to_fms(current_migration);
- if (s && s->file) {
- qemu_file_set_rate_limit(s->file, max_throttle);
- }
-
- return 0;
}
/* amount of nanoseconds we are willing to wait for migration to be down.
return max_downtime;
}
-int do_migrate_set_downtime(Monitor *mon, const QDict *qdict,
- QObject **ret_data)
+MigrationInfo *qmp_query_migrate(Error **errp)
{
- double d;
-
- d = qdict_get_double(qdict, "value") * 1e9;
- d = MAX(0, MIN(UINT64_MAX, d));
- max_downtime = (uint64_t)d;
-
- return 0;
-}
-
-static void migrate_print_status(Monitor *mon, const char *name,
- const QDict *status_dict)
-{
- QDict *qdict;
-
- qdict = qobject_to_qdict(qdict_get(status_dict, name));
-
- monitor_printf(mon, "transferred %s: %" PRIu64 " kbytes\n", name,
- qdict_get_int(qdict, "transferred") >> 10);
- monitor_printf(mon, "remaining %s: %" PRIu64 " kbytes\n", name,
- qdict_get_int(qdict, "remaining") >> 10);
- monitor_printf(mon, "total %s: %" PRIu64 " kbytes\n", name,
- qdict_get_int(qdict, "total") >> 10);
-}
-
-void do_info_migrate_print(Monitor *mon, const QObject *data)
-{
- QDict *qdict;
-
- qdict = qobject_to_qdict(data);
-
- monitor_printf(mon, "Migration status: %s\n",
- qdict_get_str(qdict, "status"));
-
- if (qdict_haskey(qdict, "ram")) {
- migrate_print_status(mon, "ram", qdict);
- }
-
- if (qdict_haskey(qdict, "disk")) {
- migrate_print_status(mon, "disk", qdict);
- }
-}
-
-static void migrate_put_status(QDict *qdict, const char *name,
- uint64_t trans, uint64_t rem, uint64_t total)
-{
- QObject *obj;
-
- obj = qobject_from_jsonf("{ 'transferred': %" PRId64 ", "
- "'remaining': %" PRId64 ", "
- "'total': %" PRId64 " }", trans, rem, total);
- qdict_put_obj(qdict, name, obj);
-}
-
-void do_info_migrate(Monitor *mon, QObject **ret_data)
-{
- QDict *qdict;
- MigrationState *s = current_migration;
-
- if (s) {
- switch (s->get_status(s)) {
- case MIG_STATE_ACTIVE:
- qdict = qdict_new();
- qdict_put(qdict, "status", qstring_from_str("active"));
-
- migrate_put_status(qdict, "ram", ram_bytes_transferred(),
- ram_bytes_remaining(), ram_bytes_total());
-
- if (blk_mig_active()) {
- migrate_put_status(qdict, "disk", blk_mig_bytes_transferred(),
- blk_mig_bytes_remaining(),
- blk_mig_bytes_total());
- }
-
- *ret_data = QOBJECT(qdict);
- break;
- case MIG_STATE_COMPLETED:
- *ret_data = qobject_from_jsonf("{ 'status': 'completed' }");
- break;
- case MIG_STATE_ERROR:
- *ret_data = qobject_from_jsonf("{ 'status': 'failed' }");
- break;
- case MIG_STATE_CANCELLED:
- *ret_data = qobject_from_jsonf("{ 'status': 'cancelled' }");
- break;
+ MigrationInfo *info = g_malloc0(sizeof(*info));
+ MigrationState *s = migrate_get_current();
+
+ switch (s->state) {
+ case MIG_STATE_SETUP:
+ /* no migration has happened ever */
+ break;
+ case MIG_STATE_ACTIVE:
+ info->has_status = true;
+ info->status = g_strdup("active");
+
+ 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();
+
+ 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 MIG_STATE_COMPLETED:
+ info->has_status = true;
+ info->status = g_strdup("completed");
+ break;
+ case MIG_STATE_ERROR:
+ info->has_status = true;
+ info->status = g_strdup("failed");
+ break;
+ case MIG_STATE_CANCELLED:
+ info->has_status = true;
+ info->status = g_strdup("cancelled");
+ break;
}
+
+ return info;
}
/* shared migration helpers */
-void migrate_fd_monitor_suspend(FdMigrationState *s, Monitor *mon)
+static void migrate_fd_monitor_suspend(MigrationState *s, Monitor *mon)
{
- s->mon = mon;
if (monitor_suspend(mon) == 0) {
DPRINTF("suspending monitor\n");
} else {
}
}
-void migrate_fd_error(FdMigrationState *s)
-{
- DPRINTF("setting error state\n");
- s->state = MIG_STATE_ERROR;
- notifier_list_notify(&migration_state_notifiers, NULL);
- migrate_fd_cleanup(s);
-}
-
-int migrate_fd_cleanup(FdMigrationState *s)
+static int migrate_fd_cleanup(MigrationState *s)
{
int ret = 0;
if (s->file) {
DPRINTF("closing file\n");
- if (qemu_fclose(s->file) != 0) {
- ret = -1;
- }
+ ret = qemu_fclose(s->file);
s->file = NULL;
} else {
if (s->mon) {
return ret;
}
-void migrate_fd_put_notify(void *opaque)
+void migrate_fd_error(MigrationState *s)
+{
+ DPRINTF("setting error state\n");
+ s->state = MIG_STATE_ERROR;
+ notifier_list_notify(&migration_state_notifiers, s);
+ migrate_fd_cleanup(s);
+}
+
+static void migrate_fd_completed(MigrationState *s)
{
- FdMigrationState *s = opaque;
+ DPRINTF("setting completed state\n");
+ if (migrate_fd_cleanup(s) < 0) {
+ s->state = MIG_STATE_ERROR;
+ } else {
+ s->state = MIG_STATE_COMPLETED;
+ runstate_set(RUN_STATE_POSTMIGRATE);
+ }
+ 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);
+ }
}
-ssize_t migrate_fd_put_buffer(void *opaque, const void *data, size_t size)
+static ssize_t migrate_fd_put_buffer(void *opaque, const void *data,
+ size_t size)
{
- FdMigrationState *s = opaque;
+ MigrationState *s = opaque;
ssize_t ret;
+ if (s->state != MIG_STATE_ACTIVE) {
+ return -EIO;
+ }
+
do {
ret = s->write(s, data, size);
} while (ret == -1 && ((s->get_error(s)) == EINTR));
if (ret == -EAGAIN) {
qemu_set_fd_handler2(s->fd, NULL, NULL, migrate_fd_put_notify, s);
- } else if (ret < 0) {
- s->state = MIG_STATE_ERROR;
- notifier_list_notify(&migration_state_notifiers, NULL);
}
return ret;
}
-void migrate_fd_connect(FdMigrationState *s)
+static void migrate_fd_put_ready(void *opaque)
{
+ MigrationState *s = opaque;
int ret;
- 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->mon, s->file, s->mig_state.blk,
- s->mig_state.shared);
- if (ret < 0) {
- DPRINTF("failed, %d\n", ret);
- migrate_fd_error(s);
- return;
- }
-
- migrate_fd_put_ready(s);
-}
-
-void migrate_fd_put_ready(void *opaque)
-{
- FdMigrationState *s = opaque;
-
if (s->state != MIG_STATE_ACTIVE) {
DPRINTF("put_ready returning because of non-active state\n");
return;
}
DPRINTF("iterate\n");
- if (qemu_savevm_state_iterate(s->mon, s->file) == 1) {
- int state;
- int old_vm_running = vm_running;
+ ret = qemu_savevm_state_iterate(s->mon, s->file);
+ if (ret < 0) {
+ migrate_fd_error(s);
+ } else if (ret == 1) {
+ int old_vm_running = runstate_is_running();
DPRINTF("done iterating\n");
- vm_stop(VMSTOP_MIGRATE);
+ vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
- if ((qemu_savevm_state_complete(s->mon, s->file)) < 0) {
- if (old_vm_running) {
- vm_start();
- }
- state = MIG_STATE_ERROR;
+ if (qemu_savevm_state_complete(s->mon, s->file) < 0) {
+ migrate_fd_error(s);
} else {
- state = MIG_STATE_COMPLETED;
+ migrate_fd_completed(s);
}
- if (migrate_fd_cleanup(s) < 0) {
+ if (s->state != MIG_STATE_COMPLETED) {
if (old_vm_running) {
vm_start();
}
- state = MIG_STATE_ERROR;
}
- s->state = state;
- notifier_list_notify(&migration_state_notifiers, NULL);
}
}
-int migrate_fd_get_status(MigrationState *mig_state)
+static void migrate_fd_cancel(MigrationState *s)
{
- FdMigrationState *s = migrate_to_fms(mig_state);
- return s->state;
-}
-
-void migrate_fd_cancel(MigrationState *mig_state)
-{
- FdMigrationState *s = migrate_to_fms(mig_state);
-
if (s->state != MIG_STATE_ACTIVE)
return;
DPRINTF("cancelling migration\n");
s->state = MIG_STATE_CANCELLED;
- notifier_list_notify(&migration_state_notifiers, NULL);
+ notifier_list_notify(&migration_state_notifiers, s);
qemu_savevm_state_cancel(s->mon, s->file);
migrate_fd_cleanup(s);
}
-void migrate_fd_release(MigrationState *mig_state)
-{
- FdMigrationState *s = migrate_to_fms(mig_state);
-
- DPRINTF("releasing state\n");
-
- if (s->state == MIG_STATE_ACTIVE) {
- s->state = MIG_STATE_CANCELLED;
- notifier_list_notify(&migration_state_notifiers, NULL);
- migrate_fd_cleanup(s);
- }
- g_free(s);
-}
-
-void migrate_fd_wait_for_unfreeze(void *opaque)
+static void migrate_fd_wait_for_unfreeze(void *opaque)
{
- FdMigrationState *s = opaque;
+ MigrationState *s = opaque;
int ret;
DPRINTF("wait for unfreeze\n");
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 migrate_fd_close(void *opaque)
+static int migrate_fd_close(void *opaque)
{
- FdMigrationState *s = opaque;
+ MigrationState *s = opaque;
if (s->mon) {
monitor_resume(s->mon);
notifier_list_remove(&migration_state_notifiers, notify);
}
-int get_migration_state(void)
+bool migration_is_active(MigrationState *s)
+{
+ return s->state == MIG_STATE_ACTIVE;
+}
+
+bool migration_has_finished(MigrationState *s)
{
- if (current_migration) {
- return migrate_fd_get_status(current_migration);
+ return s->state == MIG_STATE_COMPLETED;
+}
+
+bool migration_has_failed(MigrationState *s)
+{
+ return (s->state == MIG_STATE_CANCELLED ||
+ 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->mon, s->file, s->blk, s->shared);
+ if (ret < 0) {
+ DPRINTF("failed, %d\n", ret);
+ migrate_fd_error(s);
+ return;
+ }
+ migrate_fd_put_ready(s);
+}
+
+static MigrationState *migrate_init(Monitor *mon, int detach, int blk, int inc)
+{
+ MigrationState *s = migrate_get_current();
+ int64_t bandwidth_limit = s->bandwidth_limit;
+
+ memset(s, 0, sizeof(*s));
+ s->bandwidth_limit = bandwidth_limit;
+ s->blk = blk;
+ s->shared = inc;
+
+ /* s->mon is used for two things:
+ - pass fd in fd migration
+ - suspend/resume monitor for not detached migration
+ */
+ s->mon = mon;
+ s->bandwidth_limit = bandwidth_limit;
+ s->state = MIG_STATE_SETUP;
+
+ if (!detach) {
+ migrate_fd_monitor_suspend(s, mon);
+ }
+
+ return s;
+}
+
+static GSList *migration_blockers;
+
+void migrate_add_blocker(Error *reason)
+{
+ migration_blockers = g_slist_prepend(migration_blockers, reason);
+}
+
+void migrate_del_blocker(Error *reason)
+{
+ migration_blockers = g_slist_remove(migration_blockers, reason);
+}
+
+int do_migrate(Monitor *mon, const QDict *qdict, QObject **ret_data)
+{
+ MigrationState *s = migrate_get_current();
+ const char *p;
+ int detach = qdict_get_try_bool(qdict, "detach", 0);
+ int blk = qdict_get_try_bool(qdict, "blk", 0);
+ int inc = qdict_get_try_bool(qdict, "inc", 0);
+ const char *uri = qdict_get_str(qdict, "uri");
+ int ret;
+
+ if (s->state == MIG_STATE_ACTIVE) {
+ monitor_printf(mon, "migration already in progress\n");
+ return -1;
+ }
+
+ if (qemu_savevm_state_blocked(mon)) {
+ return -1;
+ }
+
+ if (migration_blockers) {
+ Error *err = migration_blockers->data;
+ qerror_report_err(err);
+ return -1;
+ }
+
+ s = migrate_init(mon, detach, blk, inc);
+
+ if (strstart(uri, "tcp:", &p)) {
+ ret = tcp_start_outgoing_migration(s, p);
+#if !defined(WIN32)
+ } else if (strstart(uri, "exec:", &p)) {
+ ret = exec_start_outgoing_migration(s, p);
+ } else if (strstart(uri, "unix:", &p)) {
+ ret = unix_start_outgoing_migration(s, p);
+ } else if (strstart(uri, "fd:", &p)) {
+ ret = fd_start_outgoing_migration(s, p);
+#endif
} else {
- return MIG_STATE_ERROR;
+ monitor_printf(mon, "unknown migration protocol: %s\n", uri);
+ ret = -EINVAL;
+ }
+
+ if (ret < 0) {
+ monitor_printf(mon, "migration failed: %s\n", strerror(-ret));
+ return ret;
+ }
+
+ if (detach) {
+ s->mon = NULL;
}
+
+ notifier_list_notify(&migration_state_notifiers, s);
+ return 0;
+}
+
+void qmp_migrate_cancel(Error **errp)
+{
+ migrate_fd_cancel(migrate_get_current());
+}
+
+void qmp_migrate_set_speed(int64_t value, Error **errp)
+{
+ MigrationState *s;
+
+ if (value < 0) {
+ value = 0;
+ }
+
+ s = migrate_get_current();
+ s->bandwidth_limit = value;
+ qemu_file_set_rate_limit(s->file, s->bandwidth_limit);
+}
+
+void qmp_migrate_set_downtime(double value, Error **errp)
+{
+ value *= 1e9;
+ value = MAX(0, MIN(UINT64_MAX, value));
+ max_downtime = (uint64_t)value;
}
projects / qemu.git / blobdiff