* 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 "sysemu.h"
#include "block.h"
#include "qemu_socket.h"
+#include "block-migration.h"
+#include "qmp-commands.h"
//#define DEBUG_MIGRATION
#ifdef DEBUG_MIGRATION
-#define dprintf(fmt, ...) \
+#define DPRINTF(fmt, ...) \
do { printf("migration: " fmt, ## __VA_ARGS__); } while (0)
#else
-#define dprintf(fmt, ...) \
+#define DPRINTF(fmt, ...) \
do { } while (0)
#endif
-/* Migration speed throttling */
-static uint32_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 */
-void qemu_start_incoming_migration(const char *uri)
+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)
{
- const char *p;
+ static MigrationState current_migration = {
+ .state = MIG_STATE_SETUP,
+ .bandwidth_limit = MAX_THROTTLE,
+ };
- if (strstart(uri, "tcp:", &p))
- tcp_start_incoming_migration(p);
-#if !defined(WIN32)
- else if (strstart(uri, "exec:", &p))
- exec_start_incoming_migration(p);
-#endif
- else
- fprintf(stderr, "unknown migration protocol: %s\n", uri);
+ return ¤t_migration;
}
-void do_migrate(Monitor *mon, int detach, const char *uri)
+int qemu_start_incoming_migration(const char *uri)
{
- MigrationState *s = NULL;
const char *p;
+ int ret;
if (strstart(uri, "tcp:", &p))
- s = tcp_start_outgoing_migration(p, max_throttle, detach);
+ ret = tcp_start_incoming_migration(p);
#if !defined(WIN32)
else if (strstart(uri, "exec:", &p))
- s = exec_start_outgoing_migration(p, max_throttle, detach);
+ ret = exec_start_incoming_migration(p);
+ else if (strstart(uri, "unix:", &p))
+ ret = unix_start_incoming_migration(p);
+ else if (strstart(uri, "fd:", &p))
+ ret = fd_start_incoming_migration(p);
#endif
- else
- monitor_printf(mon, "unknown migration protocol: %s\n", uri);
-
- if (s == NULL)
- monitor_printf(mon, "migration failed\n");
else {
- if (current_migration)
- current_migration->release(current_migration);
-
- current_migration = s;
+ fprintf(stderr, "unknown migration protocol: %s\n", uri);
+ ret = -EPROTONOSUPPORT;
}
+ return ret;
}
-void do_migrate_cancel(Monitor *mon)
+void process_incoming_migration(QEMUFile *f)
{
- MigrationState *s = current_migration;
+ if (qemu_loadvm_state(f) < 0) {
+ fprintf(stderr, "load of migration failed\n");
+ exit(0);
+ }
+ qemu_announce_self();
+ DPRINTF("successfully loaded vm state\n");
- if (s)
- s->cancel(s);
-}
+ bdrv_clear_incoming_migration_all();
+ /* Make sure all file formats flush their mutable metadata */
+ bdrv_invalidate_cache_all();
-void do_migrate_set_speed(Monitor *mon, const char *value)
-{
- double d;
- char *ptr;
-
- d = strtod(value, &ptr);
- switch (*ptr) {
- case 'G': case 'g':
- d *= 1024;
- case 'M': case 'm':
- d *= 1024;
- case 'K': case 'k':
- d *= 1024;
- default:
- break;
+ if (autostart) {
+ vm_start();
+ } else {
+ runstate_set(RUN_STATE_PRELAUNCH);
}
+}
+
+/* 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
+ * units must be in seconds */
+static uint64_t max_downtime = 30000000;
- max_throttle = (uint32_t)d;
+uint64_t migrate_max_downtime(void)
+{
+ return max_downtime;
}
-void do_info_migrate(Monitor *mon)
+MigrationInfo *qmp_query_migrate(Error **errp)
{
- MigrationState *s = current_migration;
-
- if (s) {
- monitor_printf(mon, "Migration status: ");
- switch (s->get_status(s)) {
- case MIG_STATE_ACTIVE:
- monitor_printf(mon, "active\n");
- break;
- case MIG_STATE_COMPLETED:
- monitor_printf(mon, "completed\n");
- break;
- case MIG_STATE_ERROR:
- monitor_printf(mon, "failed\n");
- break;
- case MIG_STATE_CANCELLED:
- monitor_printf(mon, "cancelled\n");
- 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)
+static int migrate_fd_cleanup(MigrationState *s)
{
- s->mon_resume = cur_mon;
- monitor_suspend(cur_mon);
- dprintf("suspending monitor\n");
-}
-
-void migrate_fd_error(FdMigrationState *s)
-{
- dprintf("setting error state\n");
- s->state = MIG_STATE_ERROR;
- migrate_fd_cleanup(s);
-}
+ int ret = 0;
-void migrate_fd_cleanup(FdMigrationState *s)
-{
qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
if (s->file) {
- dprintf("closing file\n");
- qemu_fclose(s->file);
+ DPRINTF("closing file\n");
+ ret = qemu_fclose(s->file);
+ s->file = NULL;
}
- if (s->fd != -1)
+ if (s->fd != -1) {
close(s->fd);
+ s->fd = -1;
+ }
- /* Don't resume monitor until we've flushed all of the buffers */
- if (s->mon_resume)
- monitor_resume(s->mon_resume);
+ return ret;
+}
- s->fd = -1;
+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);
}
-void migrate_fd_put_notify(void *opaque)
+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 || (s->get_error(s)) == EWOULDBLOCK));
+ } while (ret == -1 && ((s->get_error(s)) == EINTR));
if (ret == -1)
ret = -(s->get_error(s));
- if (ret == -EAGAIN)
+ if (ret == -EAGAIN) {
qemu_set_fd_handler2(s->fd, NULL, NULL, migrate_fd_put_notify, s);
+ }
return ret;
}
-void migrate_fd_connect(FdMigrationState *s)
+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");
+ 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);
+ }
+ 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)
+ return;
+
+ DPRINTF("cancelling migration\n");
+
+ s->state = MIG_STATE_CANCELLED;
+ notifier_list_notify(&migration_state_notifiers, s);
+ qemu_savevm_state_cancel(s->file);
+
+ migrate_fd_cleanup(s);
+}
+
+static void migrate_fd_wait_for_unfreeze(void *opaque)
{
+ 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));
+ }
+}
+
+static int migrate_fd_close(void *opaque)
+{
+ MigrationState *s = opaque;
+
+ qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
+ return s->close(s);
+}
+
+void add_migration_state_change_notifier(Notifier *notify)
+{
+ notifier_list_add(&migration_state_notifiers, notify);
+}
+
+void remove_migration_state_change_notifier(Notifier *notify)
+{
+ notifier_remove(notify);
+}
+
+bool migration_is_active(MigrationState *s)
+{
+ 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)
+{
+ int ret;
+
+ s->state = MIG_STATE_ACTIVE;
s->file = qemu_fopen_ops_buffered(s,
s->bandwidth_limit,
migrate_fd_put_buffer,
migrate_fd_wait_for_unfreeze,
migrate_fd_close);
- dprintf("beginning savevm\n");
- ret = qemu_savevm_state_begin(s->file);
+ DPRINTF("beginning savevm\n");
+ ret = qemu_savevm_state_begin(s->file, s->blk, s->shared);
if (ret < 0) {
- dprintf("failed, %d\n", ret);
+ DPRINTF("failed, %d\n", ret);
migrate_fd_error(s);
return;
}
-
migrate_fd_put_ready(s);
}
-void migrate_fd_put_ready(void *opaque)
+static MigrationState *migrate_init(int blk, int inc)
{
- FdMigrationState *s = opaque;
+ MigrationState *s = migrate_get_current();
+ int64_t bandwidth_limit = s->bandwidth_limit;
- if (s->state != MIG_STATE_ACTIVE) {
- dprintf("put_ready returning because of non-active state\n");
- return;
- }
+ memset(s, 0, sizeof(*s));
+ s->bandwidth_limit = bandwidth_limit;
+ s->blk = blk;
+ s->shared = inc;
- dprintf("iterate\n");
- if (qemu_savevm_state_iterate(s->file) == 1) {
- dprintf("done iterating\n");
- vm_stop(0);
+ s->bandwidth_limit = bandwidth_limit;
+ s->state = MIG_STATE_SETUP;
- bdrv_flush_all();
- qemu_savevm_state_complete(s->file);
- s->state = MIG_STATE_COMPLETED;
- migrate_fd_cleanup(s);
- }
+ return s;
}
-int migrate_fd_get_status(MigrationState *mig_state)
+static GSList *migration_blockers;
+
+void migrate_add_blocker(Error *reason)
{
- FdMigrationState *s = migrate_to_fms(mig_state);
- return s->state;
+ migration_blockers = g_slist_prepend(migration_blockers, reason);
}
-void migrate_fd_cancel(MigrationState *mig_state)
+void migrate_del_blocker(Error *reason)
{
- FdMigrationState *s = migrate_to_fms(mig_state);
+ migration_blockers = g_slist_remove(migration_blockers, reason);
+}
- if (s->state != MIG_STATE_ACTIVE)
+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();
+ const char *p;
+ int ret;
+
+ if (s->state == MIG_STATE_ACTIVE) {
+ error_set(errp, QERR_MIGRATION_ACTIVE);
return;
+ }
- dprintf("cancelling migration\n");
+ if (qemu_savevm_state_blocked(errp)) {
+ return;
+ }
- s->state = MIG_STATE_CANCELLED;
+ if (migration_blockers) {
+ *errp = error_copy(migration_blockers->data);
+ return;
+ }
- migrate_fd_cleanup(s);
-}
+ s = migrate_init(blk, inc);
-void migrate_fd_release(MigrationState *mig_state)
-{
- FdMigrationState *s = migrate_to_fms(mig_state);
+ 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 {
+ error_set(errp, QERR_INVALID_PARAMETER_VALUE, "uri", "a valid migration protocol");
+ return;
+ }
- dprintf("releasing state\n");
-
- if (s->state == MIG_STATE_ACTIVE) {
- s->state = MIG_STATE_CANCELLED;
- migrate_fd_cleanup(s);
+ if (ret < 0) {
+ DPRINTF("migration failed: %s\n", strerror(-ret));
+ /* FIXME: we should return meaningful errors */
+ error_set(errp, QERR_UNDEFINED_ERROR);
+ return;
}
- free(s);
+
+ notifier_list_notify(&migration_state_notifiers, s);
}
-void migrate_fd_wait_for_unfreeze(void *opaque)
+void qmp_migrate_cancel(Error **errp)
{
- FdMigrationState *s = opaque;
- int ret;
-
- dprintf("wait for unfreeze\n");
- if (s->state != MIG_STATE_ACTIVE)
- return;
+ migrate_fd_cancel(migrate_get_current());
+}
- do {
- fd_set wfds;
+void qmp_migrate_set_speed(int64_t value, Error **errp)
+{
+ MigrationState *s;
- FD_ZERO(&wfds);
- FD_SET(s->fd, &wfds);
+ if (value < 0) {
+ value = 0;
+ }
- ret = select(s->fd + 1, NULL, &wfds, NULL, NULL);
- } while (ret == -1 && (s->get_error(s)) == EINTR);
+ s = migrate_get_current();
+ s->bandwidth_limit = value;
+ qemu_file_set_rate_limit(s->file, s->bandwidth_limit);
}
-int migrate_fd_close(void *opaque)
+void qmp_migrate_set_downtime(double value, Error **errp)
{
- FdMigrationState *s = opaque;
- return s->close(s);
+ value *= 1e9;
+ value = MAX(0, MIN(UINT64_MAX, value));
+ max_downtime = (uint64_t)value;
}
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