2008-10-13 05:12:02 +02:00
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/*
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* QEMU live migration
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*
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* Copyright IBM, Corp. 2008
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#include "qemu-common.h"
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#include "migration.h"
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2009-03-06 00:01:23 +01:00
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#include "monitor.h"
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2008-11-11 17:46:33 +01:00
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#include "buffered_file.h"
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#include "sysemu.h"
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#include "block.h"
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#include "qemu_socket.h"
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2009-11-30 18:21:21 +01:00
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#include "block-migration.h"
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2009-12-10 20:16:05 +01:00
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#include "qemu-objects.h"
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2008-11-11 17:46:33 +01:00
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//#define DEBUG_MIGRATION
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#ifdef DEBUG_MIGRATION
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#define dprintf(fmt, ...) \
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do { printf("migration: " fmt, ## __VA_ARGS__); } while (0)
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#else
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#define dprintf(fmt, ...) \
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do { } while (0)
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#endif
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2008-10-13 05:12:02 +02:00
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/* Migration speed throttling */
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static uint32_t max_throttle = (32 << 20);
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static MigrationState *current_migration;
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void qemu_start_incoming_migration(const char *uri)
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{
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2008-10-13 05:14:31 +02:00
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const char *p;
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if (strstart(uri, "tcp:", &p))
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tcp_start_incoming_migration(p);
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2008-11-11 17:46:33 +01:00
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#if !defined(WIN32)
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else if (strstart(uri, "exec:", &p))
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exec_start_incoming_migration(p);
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2009-08-05 17:24:29 +02:00
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else if (strstart(uri, "unix:", &p))
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unix_start_incoming_migration(p);
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2009-08-18 15:56:25 +02:00
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else if (strstart(uri, "fd:", &p))
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fd_start_incoming_migration(p);
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2008-11-11 17:46:33 +01:00
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#endif
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2008-10-13 05:14:31 +02:00
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else
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fprintf(stderr, "unknown migration protocol: %s\n", uri);
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2008-10-13 05:12:02 +02:00
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}
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2009-10-16 17:23:45 +02:00
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void do_migrate(Monitor *mon, const QDict *qdict, QObject **ret_data)
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2008-10-13 05:12:02 +02:00
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{
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2008-10-13 05:14:31 +02:00
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MigrationState *s = NULL;
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const char *p;
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2009-08-28 20:27:14 +02:00
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int detach = qdict_get_int(qdict, "detach");
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const char *uri = qdict_get_str(qdict, "uri");
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2009-11-30 18:21:19 +01:00
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if (current_migration &&
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current_migration->get_status(current_migration) == MIG_STATE_ACTIVE) {
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monitor_printf(mon, "migration already in progress\n");
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return;
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}
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2008-10-13 05:14:31 +02:00
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if (strstart(uri, "tcp:", &p))
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2009-11-30 18:21:21 +01:00
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s = tcp_start_outgoing_migration(mon, p, max_throttle, detach,
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2009-11-02 14:40:58 +01:00
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(int)qdict_get_int(qdict, "blk"),
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(int)qdict_get_int(qdict, "inc"));
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2008-11-11 17:46:33 +01:00
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#if !defined(WIN32)
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else if (strstart(uri, "exec:", &p))
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2009-11-30 18:21:21 +01:00
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s = exec_start_outgoing_migration(mon, p, max_throttle, detach,
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2009-11-02 14:40:58 +01:00
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(int)qdict_get_int(qdict, "blk"),
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(int)qdict_get_int(qdict, "inc"));
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2009-08-05 17:24:29 +02:00
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else if (strstart(uri, "unix:", &p))
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2009-11-30 18:21:21 +01:00
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s = unix_start_outgoing_migration(mon, p, max_throttle, detach,
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2009-11-02 14:40:58 +01:00
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(int)qdict_get_int(qdict, "blk"),
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(int)qdict_get_int(qdict, "inc"));
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2009-08-18 15:56:25 +02:00
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else if (strstart(uri, "fd:", &p))
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2009-11-02 14:40:58 +01:00
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s = fd_start_outgoing_migration(mon, p, max_throttle, detach,
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(int)qdict_get_int(qdict, "blk"),
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(int)qdict_get_int(qdict, "inc"));
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2008-11-11 17:46:33 +01:00
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#endif
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2008-10-13 05:14:31 +02:00
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else
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2009-03-06 00:01:23 +01:00
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monitor_printf(mon, "unknown migration protocol: %s\n", uri);
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2008-10-13 05:14:31 +02:00
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if (s == NULL)
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2009-03-06 00:01:23 +01:00
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monitor_printf(mon, "migration failed\n");
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2008-10-13 05:14:31 +02:00
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else {
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2008-10-25 00:10:31 +02:00
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if (current_migration)
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current_migration->release(current_migration);
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2008-10-13 05:14:31 +02:00
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2008-10-25 00:10:31 +02:00
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current_migration = s;
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2008-10-13 05:14:31 +02:00
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}
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2008-10-13 05:12:02 +02:00
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}
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2009-10-16 17:23:47 +02:00
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void do_migrate_cancel(Monitor *mon, const QDict *qdict, QObject **ret_data)
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2008-10-13 05:12:02 +02:00
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{
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MigrationState *s = current_migration;
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if (s)
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2008-10-25 00:10:31 +02:00
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s->cancel(s);
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2008-10-13 05:12:02 +02:00
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}
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2010-01-25 14:23:05 +01:00
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void do_migrate_set_speed(Monitor *mon, const QDict *qdict, QObject **ret_data)
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2008-10-13 05:12:02 +02:00
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{
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double d;
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2009-05-21 00:26:58 +02:00
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FdMigrationState *s;
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2008-10-13 05:12:02 +02:00
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2010-01-25 14:23:04 +01:00
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d = qdict_get_double(qdict, "value");
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d = MAX(0, MIN(UINT32_MAX, d));
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max_throttle = d;
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2009-05-21 00:26:58 +02:00
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2009-11-30 18:21:19 +01:00
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s = migrate_to_fms(current_migration);
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if (s && s->file) {
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2009-05-21 00:26:58 +02:00
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qemu_file_set_rate_limit(s->file, max_throttle);
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}
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2008-10-13 05:12:02 +02:00
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}
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2009-05-28 21:22:57 +02:00
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/* amount of nanoseconds we are willing to wait for migration to be down.
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* the choice of nanoseconds is because it is the maximum resolution that
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* get_clock() can achieve. It is an internal measure. All user-visible
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* units must be in seconds */
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static uint64_t max_downtime = 30000000;
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uint64_t migrate_max_downtime(void)
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{
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return max_downtime;
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}
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2009-08-28 20:27:13 +02:00
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void do_migrate_set_downtime(Monitor *mon, const QDict *qdict)
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2009-05-28 21:22:58 +02:00
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{
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double d;
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2010-01-25 14:23:07 +01:00
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d = qdict_get_double(qdict, "value") * 1e9;
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d = MAX(0, MIN(UINT64_MAX, d));
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2009-05-28 21:22:58 +02:00
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max_downtime = (uint64_t)d;
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}
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2009-12-10 20:16:05 +01:00
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static void migrate_print_status(Monitor *mon, const char *name,
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const QDict *status_dict)
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2008-10-13 05:12:02 +02:00
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{
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2009-12-10 20:16:05 +01:00
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QDict *qdict;
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qdict = qobject_to_qdict(qdict_get(status_dict, name));
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monitor_printf(mon, "transferred %s: %" PRIu64 " kbytes\n", name,
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qdict_get_int(qdict, "transferred") >> 10);
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monitor_printf(mon, "remaining %s: %" PRIu64 " kbytes\n", name,
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qdict_get_int(qdict, "remaining") >> 10);
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monitor_printf(mon, "total %s: %" PRIu64 " kbytes\n", name,
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qdict_get_int(qdict, "total") >> 10);
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}
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void do_info_migrate_print(Monitor *mon, const QObject *data)
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{
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QDict *qdict;
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qdict = qobject_to_qdict(data);
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monitor_printf(mon, "Migration status: %s\n",
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qdict_get_str(qdict, "status"));
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if (qdict_haskey(qdict, "ram")) {
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migrate_print_status(mon, "ram", qdict);
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}
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if (qdict_haskey(qdict, "disk")) {
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migrate_print_status(mon, "disk", qdict);
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}
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}
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static void migrate_put_status(QDict *qdict, const char *name,
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uint64_t trans, uint64_t rem, uint64_t total)
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{
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QObject *obj;
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obj = qobject_from_jsonf("{ 'transferred': %" PRId64 ", "
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"'remaining': %" PRId64 ", "
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"'total': %" PRId64 " }", trans, rem, total);
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assert(obj != NULL);
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qdict_put_obj(qdict, name, obj);
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}
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/**
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* do_info_migrate(): Migration status
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*
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* Return a QDict. If migration is active there will be another
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* QDict with RAM migration status and if block migration is active
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* another one with block migration status.
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*
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* The main QDict contains the following:
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*
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* - "status": migration status
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* - "ram": only present if "status" is "active", it is a QDict with the
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* following RAM information (in bytes):
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* - "transferred": amount transferred
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* - "remaining": amount remaining
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* - "total": total
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* - "disk": only present if "status" is "active" and it is a block migration,
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* it is a QDict with the following disk information (in bytes):
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* - "transferred": amount transferred
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* - "remaining": amount remaining
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* - "total": total
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*
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* Examples:
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*
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* 1. Migration is "completed":
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*
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* { "status": "completed" }
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*
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* 2. Migration is "active" and it is not a block migration:
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*
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* { "status": "active",
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* "ram": { "transferred": 123, "remaining": 123, "total": 246 } }
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*
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* 3. Migration is "active" and it is a block migration:
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*
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* { "status": "active",
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* "ram": { "total": 1057024, "remaining": 1053304, "transferred": 3720 },
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* "disk": { "total": 20971520, "remaining": 20880384, "transferred": 91136 }}
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*/
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void do_info_migrate(Monitor *mon, QObject **ret_data)
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{
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QDict *qdict;
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2008-10-13 05:12:02 +02:00
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MigrationState *s = current_migration;
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2009-03-06 00:01:23 +01:00
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2008-10-13 05:12:02 +02:00
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if (s) {
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2008-10-25 00:10:31 +02:00
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switch (s->get_status(s)) {
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case MIG_STATE_ACTIVE:
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2009-12-10 20:16:05 +01:00
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qdict = qdict_new();
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qdict_put(qdict, "status", qstring_from_str("active"));
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migrate_put_status(qdict, "ram", ram_bytes_transferred(),
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ram_bytes_remaining(), ram_bytes_total());
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2009-11-30 18:21:21 +01:00
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if (blk_mig_active()) {
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2009-12-10 20:16:05 +01:00
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migrate_put_status(qdict, "disk", blk_mig_bytes_transferred(),
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blk_mig_bytes_remaining(),
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blk_mig_bytes_total());
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2009-11-30 18:21:21 +01:00
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}
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2009-12-10 20:16:05 +01:00
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*ret_data = QOBJECT(qdict);
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2008-10-25 00:10:31 +02:00
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break;
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case MIG_STATE_COMPLETED:
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2009-12-10 20:16:05 +01:00
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*ret_data = qobject_from_jsonf("{ 'status': 'completed' }");
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2008-10-25 00:10:31 +02:00
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break;
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case MIG_STATE_ERROR:
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2009-12-10 20:16:05 +01:00
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*ret_data = qobject_from_jsonf("{ 'status': 'failed' }");
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2008-10-25 00:10:31 +02:00
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break;
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case MIG_STATE_CANCELLED:
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2009-12-10 20:16:05 +01:00
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*ret_data = qobject_from_jsonf("{ 'status': 'cancelled' }");
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2008-10-25 00:10:31 +02:00
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break;
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}
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2009-12-10 20:16:05 +01:00
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assert(*ret_data != NULL);
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2008-10-13 05:12:02 +02:00
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}
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}
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2008-11-11 17:46:33 +01:00
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/* shared migration helpers */
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2009-11-30 18:21:21 +01:00
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void migrate_fd_monitor_suspend(FdMigrationState *s, Monitor *mon)
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2009-03-06 00:01:42 +01:00
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{
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2009-11-30 18:21:21 +01:00
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s->mon = mon;
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if (monitor_suspend(mon) == 0) {
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2009-03-06 00:01:51 +01:00
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dprintf("suspending monitor\n");
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2009-11-30 18:21:21 +01:00
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} else {
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monitor_printf(mon, "terminal does not allow synchronous "
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2009-03-06 00:01:51 +01:00
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"migration, continuing detached\n");
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2009-11-30 18:21:21 +01:00
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}
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2009-03-06 00:01:42 +01:00
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}
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2008-11-11 17:46:33 +01:00
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void migrate_fd_error(FdMigrationState *s)
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{
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dprintf("setting error state\n");
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s->state = MIG_STATE_ERROR;
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migrate_fd_cleanup(s);
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}
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void migrate_fd_cleanup(FdMigrationState *s)
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{
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qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
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if (s->file) {
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dprintf("closing file\n");
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qemu_fclose(s->file);
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2009-11-30 18:21:19 +01:00
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s->file = NULL;
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2008-11-11 17:46:33 +01:00
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}
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if (s->fd != -1)
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close(s->fd);
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/* Don't resume monitor until we've flushed all of the buffers */
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2009-11-30 18:21:21 +01:00
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if (s->mon) {
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monitor_resume(s->mon);
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}
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2008-11-11 17:46:33 +01:00
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s->fd = -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
void migrate_fd_put_notify(void *opaque)
|
|
|
|
{
|
|
|
|
FdMigrationState *s = opaque;
|
|
|
|
|
|
|
|
qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
|
|
|
|
qemu_file_put_notify(s->file);
|
|
|
|
}
|
|
|
|
|
|
|
|
ssize_t migrate_fd_put_buffer(void *opaque, const void *data, size_t size)
|
|
|
|
{
|
|
|
|
FdMigrationState *s = opaque;
|
|
|
|
ssize_t ret;
|
|
|
|
|
|
|
|
do {
|
|
|
|
ret = s->write(s, data, size);
|
2009-05-19 13:08:53 +02:00
|
|
|
} while (ret == -1 && ((s->get_error(s)) == EINTR));
|
2008-11-11 17:46:33 +01:00
|
|
|
|
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
|
|
|
void migrate_fd_connect(FdMigrationState *s)
|
|
|
|
{
|
|
|
|
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");
|
2009-11-30 18:21:21 +01:00
|
|
|
ret = qemu_savevm_state_begin(s->mon, s->file, s->mig_state.blk,
|
2009-11-02 14:40:58 +01:00
|
|
|
s->mig_state.shared);
|
2008-11-11 17:46:33 +01:00
|
|
|
if (ret < 0) {
|
|
|
|
dprintf("failed, %d\n", ret);
|
|
|
|
migrate_fd_error(s);
|
|
|
|
return;
|
|
|
|
}
|
2009-11-02 14:40:58 +01:00
|
|
|
|
2008-11-11 17:46:33 +01:00
|
|
|
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");
|
2009-11-30 18:21:21 +01:00
|
|
|
if (qemu_savevm_state_iterate(s->mon, s->file) == 1) {
|
2009-04-05 21:30:33 +02:00
|
|
|
int state;
|
2009-07-09 20:25:47 +02:00
|
|
|
int old_vm_running = vm_running;
|
|
|
|
|
2008-11-11 17:46:33 +01:00
|
|
|
dprintf("done iterating\n");
|
|
|
|
vm_stop(0);
|
|
|
|
|
2009-07-06 15:32:09 +02:00
|
|
|
qemu_aio_flush();
|
2008-11-11 17:46:33 +01:00
|
|
|
bdrv_flush_all();
|
2009-11-30 18:21:21 +01:00
|
|
|
if ((qemu_savevm_state_complete(s->mon, s->file)) < 0) {
|
2009-07-09 20:25:47 +02:00
|
|
|
if (old_vm_running) {
|
|
|
|
vm_start();
|
|
|
|
}
|
2009-04-05 21:30:33 +02:00
|
|
|
state = MIG_STATE_ERROR;
|
|
|
|
} else {
|
|
|
|
state = MIG_STATE_COMPLETED;
|
|
|
|
}
|
2008-11-11 17:46:33 +01:00
|
|
|
migrate_fd_cleanup(s);
|
2009-04-05 21:30:33 +02:00
|
|
|
s->state = state;
|
2008-11-11 17:46:33 +01:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
int migrate_fd_get_status(MigrationState *mig_state)
|
|
|
|
{
|
|
|
|
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;
|
2009-11-30 18:21:21 +01:00
|
|
|
qemu_savevm_state_cancel(s->mon, s->file);
|
2008-11-11 17:46:33 +01:00
|
|
|
|
|
|
|
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;
|
|
|
|
migrate_fd_cleanup(s);
|
|
|
|
}
|
|
|
|
free(s);
|
|
|
|
}
|
|
|
|
|
|
|
|
void migrate_fd_wait_for_unfreeze(void *opaque)
|
|
|
|
{
|
|
|
|
FdMigrationState *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);
|
|
|
|
}
|
|
|
|
|
|
|
|
int migrate_fd_close(void *opaque)
|
|
|
|
{
|
|
|
|
FdMigrationState *s = opaque;
|
2009-06-08 13:28:01 +02:00
|
|
|
|
|
|
|
qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
|
2008-11-11 17:46:33 +01:00
|
|
|
return s->close(s);
|
|
|
|
}
|