If migration failed in migrate_fd_put_buffer, the monitor may have been resumed not only in the error path of that function but also once again in migrate_fd_put_ready which is called unconditionally by migrate_fd_connect. Fix this by establishing a cleaner policy: the monitor shall be resumed when the migration file is closed, either via callback (migrate_fd_close) or in migrate_fd_cleanup if no file is open (i.e. no callback invoked). Reported-By: Michael Tokarev <mjt@tls.msk.ru> Tested-By: Michael Tokarev <mjt@tls.msk.ru> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
482 lines
12 KiB
C
482 lines
12 KiB
C
/*
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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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#include "monitor.h"
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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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#include "block-migration.h"
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#include "qemu-objects.h"
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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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/* Migration speed throttling */
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static int64_t max_throttle = (32 << 20);
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static MigrationState *current_migration;
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static NotifierList migration_state_notifiers =
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NOTIFIER_LIST_INITIALIZER(migration_state_notifiers);
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int qemu_start_incoming_migration(const char *uri)
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{
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const char *p;
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int ret;
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if (strstart(uri, "tcp:", &p))
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ret = tcp_start_incoming_migration(p);
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#if !defined(WIN32)
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else if (strstart(uri, "exec:", &p))
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ret = exec_start_incoming_migration(p);
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else if (strstart(uri, "unix:", &p))
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ret = unix_start_incoming_migration(p);
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else if (strstart(uri, "fd:", &p))
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ret = fd_start_incoming_migration(p);
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#endif
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else {
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fprintf(stderr, "unknown migration protocol: %s\n", uri);
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ret = -EPROTONOSUPPORT;
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}
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return ret;
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}
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void process_incoming_migration(QEMUFile *f)
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{
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if (qemu_loadvm_state(f) < 0) {
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fprintf(stderr, "load of migration failed\n");
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exit(0);
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}
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qemu_announce_self();
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DPRINTF("successfully loaded vm state\n");
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incoming_expected = false;
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if (autostart)
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vm_start();
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}
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int do_migrate(Monitor *mon, const QDict *qdict, QObject **ret_data)
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{
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MigrationState *s = NULL;
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const char *p;
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int detach = qdict_get_try_bool(qdict, "detach", 0);
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int blk = qdict_get_try_bool(qdict, "blk", 0);
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int inc = qdict_get_try_bool(qdict, "inc", 0);
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const char *uri = qdict_get_str(qdict, "uri");
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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 -1;
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}
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if (qemu_savevm_state_blocked(mon)) {
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return -1;
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}
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if (strstart(uri, "tcp:", &p)) {
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s = tcp_start_outgoing_migration(mon, p, max_throttle, detach,
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blk, inc);
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#if !defined(WIN32)
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} else if (strstart(uri, "exec:", &p)) {
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s = exec_start_outgoing_migration(mon, p, max_throttle, detach,
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blk, inc);
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} else if (strstart(uri, "unix:", &p)) {
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s = unix_start_outgoing_migration(mon, p, max_throttle, detach,
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blk, inc);
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} else if (strstart(uri, "fd:", &p)) {
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s = fd_start_outgoing_migration(mon, p, max_throttle, detach,
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blk, inc);
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#endif
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} else {
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monitor_printf(mon, "unknown migration protocol: %s\n", uri);
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return -1;
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}
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if (s == NULL) {
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monitor_printf(mon, "migration failed\n");
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return -1;
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}
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if (current_migration) {
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current_migration->release(current_migration);
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}
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current_migration = s;
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notifier_list_notify(&migration_state_notifiers, NULL);
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return 0;
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}
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int do_migrate_cancel(Monitor *mon, const QDict *qdict, QObject **ret_data)
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{
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MigrationState *s = current_migration;
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if (s)
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s->cancel(s);
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return 0;
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}
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int do_migrate_set_speed(Monitor *mon, const QDict *qdict, QObject **ret_data)
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{
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int64_t d;
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FdMigrationState *s;
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d = qdict_get_int(qdict, "value");
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if (d < 0) {
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d = 0;
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}
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max_throttle = d;
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s = migrate_to_fms(current_migration);
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if (s && s->file) {
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qemu_file_set_rate_limit(s->file, max_throttle);
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}
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return 0;
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}
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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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int do_migrate_set_downtime(Monitor *mon, const QDict *qdict,
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QObject **ret_data)
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{
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double d;
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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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max_downtime = (uint64_t)d;
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return 0;
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}
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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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{
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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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qdict_put_obj(qdict, name, obj);
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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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MigrationState *s = current_migration;
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if (s) {
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switch (s->get_status(s)) {
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case MIG_STATE_ACTIVE:
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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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if (blk_mig_active()) {
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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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}
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*ret_data = QOBJECT(qdict);
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break;
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case MIG_STATE_COMPLETED:
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*ret_data = qobject_from_jsonf("{ 'status': 'completed' }");
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break;
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case MIG_STATE_ERROR:
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*ret_data = qobject_from_jsonf("{ 'status': 'failed' }");
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break;
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case MIG_STATE_CANCELLED:
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*ret_data = qobject_from_jsonf("{ 'status': 'cancelled' }");
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break;
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}
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}
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}
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/* shared migration helpers */
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void migrate_fd_monitor_suspend(FdMigrationState *s, Monitor *mon)
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{
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s->mon = mon;
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if (monitor_suspend(mon) == 0) {
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DPRINTF("suspending monitor\n");
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} else {
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monitor_printf(mon, "terminal does not allow synchronous "
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"migration, continuing detached\n");
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}
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}
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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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notifier_list_notify(&migration_state_notifiers, NULL);
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migrate_fd_cleanup(s);
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}
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int migrate_fd_cleanup(FdMigrationState *s)
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{
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int ret = 0;
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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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if (qemu_fclose(s->file) != 0) {
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ret = -1;
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}
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s->file = NULL;
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} else {
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if (s->mon) {
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monitor_resume(s->mon);
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}
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}
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if (s->fd != -1) {
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close(s->fd);
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s->fd = -1;
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}
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return ret;
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}
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void migrate_fd_put_notify(void *opaque)
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{
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FdMigrationState *s = opaque;
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qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
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qemu_file_put_notify(s->file);
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}
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ssize_t migrate_fd_put_buffer(void *opaque, const void *data, size_t size)
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{
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FdMigrationState *s = opaque;
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ssize_t ret;
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do {
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ret = s->write(s, data, size);
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} while (ret == -1 && ((s->get_error(s)) == EINTR));
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if (ret == -1)
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ret = -(s->get_error(s));
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if (ret == -EAGAIN) {
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qemu_set_fd_handler2(s->fd, NULL, NULL, migrate_fd_put_notify, s);
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} else if (ret < 0) {
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s->state = MIG_STATE_ERROR;
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notifier_list_notify(&migration_state_notifiers, NULL);
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}
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return ret;
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}
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void migrate_fd_connect(FdMigrationState *s)
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{
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int ret;
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s->file = qemu_fopen_ops_buffered(s,
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s->bandwidth_limit,
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migrate_fd_put_buffer,
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migrate_fd_put_ready,
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migrate_fd_wait_for_unfreeze,
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migrate_fd_close);
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DPRINTF("beginning savevm\n");
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ret = qemu_savevm_state_begin(s->mon, s->file, s->mig_state.blk,
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s->mig_state.shared);
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if (ret < 0) {
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DPRINTF("failed, %d\n", ret);
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migrate_fd_error(s);
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return;
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}
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migrate_fd_put_ready(s);
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}
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void migrate_fd_put_ready(void *opaque)
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{
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FdMigrationState *s = opaque;
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if (s->state != MIG_STATE_ACTIVE) {
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DPRINTF("put_ready returning because of non-active state\n");
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return;
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}
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DPRINTF("iterate\n");
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if (qemu_savevm_state_iterate(s->mon, s->file) == 1) {
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int state;
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int old_vm_running = vm_running;
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DPRINTF("done iterating\n");
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vm_stop(VMSTOP_MIGRATE);
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if ((qemu_savevm_state_complete(s->mon, s->file)) < 0) {
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if (old_vm_running) {
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vm_start();
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}
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state = MIG_STATE_ERROR;
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} else {
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state = MIG_STATE_COMPLETED;
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}
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if (migrate_fd_cleanup(s) < 0) {
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if (old_vm_running) {
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vm_start();
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}
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state = MIG_STATE_ERROR;
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}
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s->state = state;
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notifier_list_notify(&migration_state_notifiers, NULL);
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}
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}
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int migrate_fd_get_status(MigrationState *mig_state)
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{
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FdMigrationState *s = migrate_to_fms(mig_state);
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return s->state;
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}
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void migrate_fd_cancel(MigrationState *mig_state)
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{
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FdMigrationState *s = migrate_to_fms(mig_state);
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if (s->state != MIG_STATE_ACTIVE)
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return;
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DPRINTF("cancelling migration\n");
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s->state = MIG_STATE_CANCELLED;
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notifier_list_notify(&migration_state_notifiers, NULL);
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qemu_savevm_state_cancel(s->mon, s->file);
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migrate_fd_cleanup(s);
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}
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void migrate_fd_release(MigrationState *mig_state)
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{
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FdMigrationState *s = migrate_to_fms(mig_state);
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DPRINTF("releasing state\n");
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if (s->state == MIG_STATE_ACTIVE) {
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s->state = MIG_STATE_CANCELLED;
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notifier_list_notify(&migration_state_notifiers, NULL);
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migrate_fd_cleanup(s);
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}
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qemu_free(s);
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}
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void migrate_fd_wait_for_unfreeze(void *opaque)
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{
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FdMigrationState *s = opaque;
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int ret;
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DPRINTF("wait for unfreeze\n");
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if (s->state != MIG_STATE_ACTIVE)
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return;
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do {
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fd_set wfds;
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FD_ZERO(&wfds);
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FD_SET(s->fd, &wfds);
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ret = select(s->fd + 1, NULL, &wfds, NULL, NULL);
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} while (ret == -1 && (s->get_error(s)) == EINTR);
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}
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int migrate_fd_close(void *opaque)
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{
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FdMigrationState *s = opaque;
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if (s->mon) {
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monitor_resume(s->mon);
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}
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qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
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return s->close(s);
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}
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void add_migration_state_change_notifier(Notifier *notify)
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{
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notifier_list_add(&migration_state_notifiers, notify);
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}
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void remove_migration_state_change_notifier(Notifier *notify)
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{
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notifier_list_remove(&migration_state_notifiers, notify);
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}
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int get_migration_state(void)
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{
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if (current_migration) {
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return migrate_fd_get_status(current_migration);
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} else {
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return MIG_STATE_ERROR;
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}
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}
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