* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
+ * Contributions after 2012-01-13 are licensed under the terms of the
+ * GNU GPL, version 2 or (at your option) any later version.
*/
#include "qemu-common.h"
#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);
-int qemu_start_incoming_migration(const char *uri)
+/* 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, Error **errp)
{
const char *p;
int ret;
if (strstart(uri, "tcp:", &p))
- ret = tcp_start_incoming_migration(p);
+ ret = tcp_start_incoming_migration(p, errp);
#if !defined(WIN32)
else if (strstart(uri, "exec:", &p))
ret = exec_start_incoming_migration(p);
qemu_announce_self();
DPRINTF("successfully loaded vm state\n");
+ bdrv_clear_incoming_migration_all();
+ /* Make sure all file formats flush their mutable metadata */
+ bdrv_invalidate_cache_all();
+
if (autostart) {
vm_start();
} else {
}
}
-static MigrationState *migrate_new(Monitor *mon, int64_t bandwidth_limit,
- int detach, int blk, int inc);
-
-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");
- int ret;
-
- if (current_migration &&
- current_migration->state == MIG_STATE_ACTIVE) {
- monitor_printf(mon, "migration already in progress\n");
- return -1;
- }
-
- if (qemu_savevm_state_blocked(mon)) {
- return -1;
- }
-
- s = migrate_new(mon, max_throttle, 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 {
- monitor_printf(mon, "unknown migration protocol: %s\n", uri);
- ret = -EINVAL;
- goto free_migrate_state;
- }
-
- if (ret < 0) {
- monitor_printf(mon, "migration failed\n");
- goto free_migrate_state;
- }
-
- g_free(current_migration);
- current_migration = s;
- notifier_list_notify(&migration_state_notifiers, NULL);
- return 0;
-free_migrate_state:
- g_free(s);
- return -1;
-}
-
-int do_migrate_cancel(Monitor *mon, const QDict *qdict, QObject **ret_data)
-{
- MigrationState *s = current_migration;
-
- if (s && s->state == MIG_STATE_ACTIVE) {
- s->cancel(s);
- }
- return 0;
-}
-
-int do_migrate_set_speed(Monitor *mon, const QDict *qdict, QObject **ret_data)
-{
- int64_t d;
- MigrationState *s;
-
- d = qdict_get_int(qdict, "value");
- if (d < 0) {
- d = 0;
- }
- max_throttle = d;
-
- s = 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.
* 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;
}
-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;
-
- if (current_migration) {
- MigrationState *s = current_migration;
-
- switch (s->state) {
- case MIG_STATE_SETUP:
- /* no migration has happened ever */
- break;
- 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 */
-static void migrate_fd_monitor_suspend(MigrationState *s, Monitor *mon)
-{
- s->mon = mon;
- if (monitor_suspend(mon) == 0) {
- DPRINTF("suspending monitor\n");
- } else {
- monitor_printf(mon, "terminal does not allow synchronous "
- "migration, continuing detached\n");
- }
-}
-
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) {
- monitor_resume(s->mon);
- }
}
if (s->fd != -1) {
{
DPRINTF("setting error state\n");
s->state = MIG_STATE_ERROR;
- notifier_list_notify(&migration_state_notifiers, NULL);
+ notifier_list_notify(&migration_state_notifiers, s);
migrate_fd_cleanup(s);
}
s->state = MIG_STATE_COMPLETED;
runstate_set(RUN_STATE_POSTMIGRATE);
}
- notifier_list_notify(&migration_state_notifiers, NULL);
+ notifier_list_notify(&migration_state_notifiers, s);
}
static void migrate_fd_put_notify(void *opaque)
qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
qemu_file_put_notify(s->file);
- if (qemu_file_get_error(s->file)) {
+ if (s->file && qemu_file_get_error(s->file)) {
migrate_fd_error(s);
}
}
}
DPRINTF("iterate\n");
- ret = qemu_savevm_state_iterate(s->mon, s->file);
+ 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");
- vm_stop(RUN_STATE_FINISH_MIGRATE);
+ qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
+ vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
- if (qemu_savevm_state_complete(s->mon, s->file) < 0) {
+ if (qemu_savevm_state_complete(s->file) < 0) {
migrate_fd_error(s);
} else {
migrate_fd_completed(s);
DPRINTF("cancelling migration\n");
s->state = MIG_STATE_CANCELLED;
- notifier_list_notify(&migration_state_notifiers, NULL);
- qemu_savevm_state_cancel(s->mon, s->file);
+ notifier_list_notify(&migration_state_notifiers, s);
+ qemu_savevm_state_cancel(s->file);
migrate_fd_cleanup(s);
}
{
MigrationState *s = opaque;
- if (s->mon) {
- monitor_resume(s->mon);
- }
qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
return s->close(s);
}
void remove_migration_state_change_notifier(Notifier *notify)
{
- notifier_list_remove(&migration_state_notifiers, notify);
+ notifier_remove(notify);
}
-int get_migration_state(void)
+bool migration_is_active(MigrationState *s)
{
- if (current_migration) {
- return current_migration->state;
- } else {
- return MIG_STATE_ERROR;
- }
+ return s->state == MIG_STATE_ACTIVE;
+}
+
+bool migration_has_finished(MigrationState *s)
+{
+ 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)
migrate_fd_close);
DPRINTF("beginning savevm\n");
- ret = qemu_savevm_state_begin(s->mon, s->file, s->blk, s->shared);
+ ret = qemu_savevm_state_begin(s->file, &s->params);
if (ret < 0) {
DPRINTF("failed, %d\n", ret);
migrate_fd_error(s);
migrate_fd_put_ready(s);
}
-static MigrationState *migrate_new(Monitor *mon, int64_t bandwidth_limit,
- int detach, int blk, int inc)
+static MigrationState *migrate_init(const MigrationParams *params)
{
- MigrationState *s = g_malloc0(sizeof(*s));
+ MigrationState *s = migrate_get_current();
+ int64_t bandwidth_limit = s->bandwidth_limit;
+
+ memset(s, 0, sizeof(*s));
+ s->bandwidth_limit = bandwidth_limit;
+ s->params = *params;
- s->cancel = migrate_fd_cancel;
- s->blk = blk;
- s->shared = inc;
- s->mon = NULL;
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);
+}
+
+void qmp_migrate(const char *uri, bool has_blk, bool blk,
+ bool has_inc, bool inc, bool has_detach, bool detach,
+ Error **errp)
+{
+ MigrationState *s = migrate_get_current();
+ MigrationParams params;
+ const char *p;
+ int ret;
+
+ params.blk = blk;
+ params.shared = inc;
+
+ if (s->state == MIG_STATE_ACTIVE) {
+ error_set(errp, QERR_MIGRATION_ACTIVE);
+ return;
}
- return s;
+ if (qemu_savevm_state_blocked(errp)) {
+ return;
+ }
+
+ if (migration_blockers) {
+ *errp = error_copy(migration_blockers->data);
+ return;
+ }
+
+ s = migrate_init(¶ms);
+
+ if (strstart(uri, "tcp:", &p)) {
+ ret = tcp_start_outgoing_migration(s, p, errp);
+#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 {
+ 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);
+ }
+ return;
+ }
+
+ notifier_list_notify(&migration_state_notifiers, s);
+}
+
+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