mirror of https://gitee.com/openkylin/qemu.git
355 lines
8.5 KiB
C
355 lines
8.5 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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//#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 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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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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#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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else if (strstart(uri, "unix:", &p))
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unix_start_incoming_migration(p);
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else if (strstart(uri, "fd:", &p))
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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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}
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void 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_int(qdict, "detach");
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const char *uri = qdict_get_str(qdict, "uri");
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if (strstart(uri, "tcp:", &p))
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s = tcp_start_outgoing_migration(p, max_throttle, detach);
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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(p, max_throttle, detach);
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else if (strstart(uri, "unix:", &p))
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s = unix_start_outgoing_migration(p, max_throttle, detach);
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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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#endif
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else
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monitor_printf(mon, "unknown migration protocol: %s\n", uri);
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if (s == NULL)
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monitor_printf(mon, "migration failed\n");
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else {
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if (current_migration)
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current_migration->release(current_migration);
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current_migration = s;
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}
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}
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void 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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}
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void do_migrate_set_speed(Monitor *mon, const QDict *qdict, QObject **ret_data)
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{
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double d;
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char *ptr;
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FdMigrationState *s;
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const char *value = qdict_get_str(qdict, "value");
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d = strtod(value, &ptr);
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switch (*ptr) {
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case 'G': case 'g':
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d *= 1024;
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case 'M': case 'm':
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d *= 1024;
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case 'K': case 'k':
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d *= 1024;
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default:
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break;
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}
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max_throttle = (uint32_t)d;
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s = migrate_to_fms(current_migration);
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if (s) {
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qemu_file_set_rate_limit(s->file, max_throttle);
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}
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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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void do_migrate_set_downtime(Monitor *mon, const QDict *qdict)
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{
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char *ptr;
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double d;
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const char *value = qdict_get_str(qdict, "value");
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d = strtod(value, &ptr);
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if (!strcmp(ptr,"ms")) {
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d *= 1000000;
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} else if (!strcmp(ptr,"us")) {
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d *= 1000;
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} else if (!strcmp(ptr,"ns")) {
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} else {
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/* all else considered to be seconds */
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d *= 1000000000;
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}
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max_downtime = (uint64_t)d;
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}
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void do_info_migrate(Monitor *mon)
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{
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MigrationState *s = current_migration;
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if (s) {
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monitor_printf(mon, "Migration status: ");
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switch (s->get_status(s)) {
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case MIG_STATE_ACTIVE:
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monitor_printf(mon, "active\n");
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monitor_printf(mon, "transferred ram: %" PRIu64 " kbytes\n", ram_bytes_transferred() >> 10);
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monitor_printf(mon, "remaining ram: %" PRIu64 " kbytes\n", ram_bytes_remaining() >> 10);
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monitor_printf(mon, "total ram: %" PRIu64 " kbytes\n", ram_bytes_total() >> 10);
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break;
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case MIG_STATE_COMPLETED:
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monitor_printf(mon, "completed\n");
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break;
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case MIG_STATE_ERROR:
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monitor_printf(mon, "failed\n");
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break;
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case MIG_STATE_CANCELLED:
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monitor_printf(mon, "cancelled\n");
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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)
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{
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s->mon_resume = cur_mon;
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if (monitor_suspend(cur_mon) == 0)
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dprintf("suspending monitor\n");
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else
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monitor_printf(cur_mon, "terminal does not allow synchronous "
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"migration, continuing detached\n");
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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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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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}
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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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if (s->mon_resume)
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monitor_resume(s->mon_resume);
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s->fd = -1;
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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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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->file);
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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->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(0);
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qemu_aio_flush();
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bdrv_flush_all();
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if ((qemu_savevm_state_complete(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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migrate_fd_cleanup(s);
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s->state = state;
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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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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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migrate_fd_cleanup(s);
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}
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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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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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