Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Reviewed-by: Eric Blake <eblake@redhat.com>
803 lines
20 KiB
C
803 lines
20 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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* Contributions after 2012-01-13 are licensed under the terms of the
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* GNU GPL, version 2 or (at your option) any later version.
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*/
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#include "qemu-common.h"
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#include "migration/migration.h"
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#include "monitor/monitor.h"
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#include "migration/qemu-file.h"
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#include "sysemu/sysemu.h"
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#include "block/block.h"
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#include "qemu/sockets.h"
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#include "migration/block.h"
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#include "qemu/thread.h"
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#include "qmp-commands.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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enum {
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MIG_STATE_ERROR,
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MIG_STATE_SETUP,
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MIG_STATE_CANCELLED,
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MIG_STATE_ACTIVE,
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MIG_STATE_COMPLETED,
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};
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#define MAX_THROTTLE (32 << 20) /* Migration speed throttling */
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/* Amount of time to allocate to each "chunk" of bandwidth-throttled
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* data. */
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#define BUFFER_DELAY 100
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#define XFER_LIMIT_RATIO (1000 / BUFFER_DELAY)
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/* Migration XBZRLE default cache size */
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#define DEFAULT_MIGRATE_CACHE_SIZE (64 * 1024 * 1024)
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static NotifierList migration_state_notifiers =
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NOTIFIER_LIST_INITIALIZER(migration_state_notifiers);
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/* When we add fault tolerance, we could have several
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migrations at once. For now we don't need to add
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dynamic creation of migration */
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MigrationState *migrate_get_current(void)
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{
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static MigrationState current_migration = {
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.state = MIG_STATE_SETUP,
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.bandwidth_limit = MAX_THROTTLE,
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.xbzrle_cache_size = DEFAULT_MIGRATE_CACHE_SIZE,
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};
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return ¤t_migration;
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}
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void qemu_start_incoming_migration(const char *uri, Error **errp)
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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, errp);
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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, errp);
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else if (strstart(uri, "unix:", &p))
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unix_start_incoming_migration(p, errp);
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else if (strstart(uri, "fd:", &p))
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fd_start_incoming_migration(p, errp);
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#endif
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else {
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error_setg(errp, "unknown migration protocol: %s\n", uri);
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}
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}
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static void process_incoming_migration_co(void *opaque)
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{
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QEMUFile *f = opaque;
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int ret;
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ret = qemu_loadvm_state(f);
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qemu_set_fd_handler(qemu_get_fd(f), NULL, NULL, NULL);
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qemu_fclose(f);
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if (ret < 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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bdrv_clear_incoming_migration_all();
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/* Make sure all file formats flush their mutable metadata */
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bdrv_invalidate_cache_all();
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if (autostart) {
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vm_start();
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} else {
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runstate_set(RUN_STATE_PAUSED);
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}
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}
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static void enter_migration_coroutine(void *opaque)
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{
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Coroutine *co = opaque;
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qemu_coroutine_enter(co, NULL);
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}
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void process_incoming_migration(QEMUFile *f)
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{
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Coroutine *co = qemu_coroutine_create(process_incoming_migration_co);
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int fd = qemu_get_fd(f);
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assert(fd != -1);
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socket_set_nonblock(fd);
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qemu_set_fd_handler(fd, enter_migration_coroutine, NULL, co);
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qemu_coroutine_enter(co, f);
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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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MigrationCapabilityStatusList *qmp_query_migrate_capabilities(Error **errp)
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{
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MigrationCapabilityStatusList *head = NULL;
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MigrationCapabilityStatusList *caps;
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MigrationState *s = migrate_get_current();
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int i;
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for (i = 0; i < MIGRATION_CAPABILITY_MAX; i++) {
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if (head == NULL) {
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head = g_malloc0(sizeof(*caps));
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caps = head;
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} else {
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caps->next = g_malloc0(sizeof(*caps));
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caps = caps->next;
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}
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caps->value =
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g_malloc(sizeof(*caps->value));
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caps->value->capability = i;
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caps->value->state = s->enabled_capabilities[i];
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}
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return head;
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}
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static void get_xbzrle_cache_stats(MigrationInfo *info)
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{
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if (migrate_use_xbzrle()) {
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info->has_xbzrle_cache = true;
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info->xbzrle_cache = g_malloc0(sizeof(*info->xbzrle_cache));
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info->xbzrle_cache->cache_size = migrate_xbzrle_cache_size();
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info->xbzrle_cache->bytes = xbzrle_mig_bytes_transferred();
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info->xbzrle_cache->pages = xbzrle_mig_pages_transferred();
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info->xbzrle_cache->cache_miss = xbzrle_mig_pages_cache_miss();
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info->xbzrle_cache->overflow = xbzrle_mig_pages_overflow();
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}
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}
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MigrationInfo *qmp_query_migrate(Error **errp)
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{
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MigrationInfo *info = g_malloc0(sizeof(*info));
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MigrationState *s = migrate_get_current();
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switch (s->state) {
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case MIG_STATE_SETUP:
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/* no migration has happened ever */
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break;
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case MIG_STATE_ACTIVE:
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info->has_status = true;
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info->status = g_strdup("active");
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info->has_total_time = true;
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info->total_time = qemu_get_clock_ms(rt_clock)
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- s->total_time;
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info->has_expected_downtime = true;
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info->expected_downtime = s->expected_downtime;
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info->has_ram = true;
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info->ram = g_malloc0(sizeof(*info->ram));
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info->ram->transferred = ram_bytes_transferred();
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info->ram->remaining = ram_bytes_remaining();
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info->ram->total = ram_bytes_total();
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info->ram->duplicate = dup_mig_pages_transferred();
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info->ram->normal = norm_mig_pages_transferred();
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info->ram->normal_bytes = norm_mig_bytes_transferred();
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info->ram->dirty_pages_rate = s->dirty_pages_rate;
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if (blk_mig_active()) {
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info->has_disk = true;
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info->disk = g_malloc0(sizeof(*info->disk));
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info->disk->transferred = blk_mig_bytes_transferred();
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info->disk->remaining = blk_mig_bytes_remaining();
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info->disk->total = blk_mig_bytes_total();
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}
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get_xbzrle_cache_stats(info);
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break;
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case MIG_STATE_COMPLETED:
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get_xbzrle_cache_stats(info);
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info->has_status = true;
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info->status = g_strdup("completed");
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info->total_time = s->total_time;
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info->has_downtime = true;
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info->downtime = s->downtime;
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info->has_ram = true;
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info->ram = g_malloc0(sizeof(*info->ram));
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info->ram->transferred = ram_bytes_transferred();
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info->ram->remaining = 0;
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info->ram->total = ram_bytes_total();
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info->ram->duplicate = dup_mig_pages_transferred();
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info->ram->normal = norm_mig_pages_transferred();
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info->ram->normal_bytes = norm_mig_bytes_transferred();
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break;
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case MIG_STATE_ERROR:
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info->has_status = true;
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info->status = g_strdup("failed");
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break;
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case MIG_STATE_CANCELLED:
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info->has_status = true;
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info->status = g_strdup("cancelled");
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break;
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}
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return info;
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}
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void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params,
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Error **errp)
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{
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MigrationState *s = migrate_get_current();
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MigrationCapabilityStatusList *cap;
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if (s->state == MIG_STATE_ACTIVE) {
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error_set(errp, QERR_MIGRATION_ACTIVE);
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return;
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}
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for (cap = params; cap; cap = cap->next) {
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s->enabled_capabilities[cap->value->capability] = cap->value->state;
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}
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}
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/* shared migration helpers */
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static int migrate_fd_cleanup(MigrationState *s)
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{
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int ret = 0;
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if (s->file) {
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DPRINTF("closing file\n");
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ret = qemu_fclose(s->file);
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s->file = NULL;
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}
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assert(s->fd == -1);
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return ret;
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}
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void migrate_fd_error(MigrationState *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, s);
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migrate_fd_cleanup(s);
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}
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static void migrate_fd_completed(MigrationState *s)
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{
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DPRINTF("setting completed state\n");
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if (migrate_fd_cleanup(s) < 0) {
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s->state = MIG_STATE_ERROR;
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} else {
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s->state = MIG_STATE_COMPLETED;
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runstate_set(RUN_STATE_POSTMIGRATE);
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}
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notifier_list_notify(&migration_state_notifiers, s);
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}
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static ssize_t migrate_fd_put_buffer(MigrationState *s, const void *data,
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size_t size)
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{
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ssize_t ret;
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if (s->state != MIG_STATE_ACTIVE) {
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return -EIO;
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}
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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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return ret;
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}
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static void migrate_fd_cancel(MigrationState *s)
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{
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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, s);
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qemu_savevm_state_cancel(s->file);
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migrate_fd_cleanup(s);
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}
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int migrate_fd_close(MigrationState *s)
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{
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int rc = 0;
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if (s->fd != -1) {
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rc = s->close(s);
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s->fd = -1;
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}
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return rc;
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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_remove(notify);
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}
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bool migration_is_active(MigrationState *s)
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{
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return s->state == MIG_STATE_ACTIVE;
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}
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bool migration_has_finished(MigrationState *s)
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{
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return s->state == MIG_STATE_COMPLETED;
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}
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bool migration_has_failed(MigrationState *s)
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{
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return (s->state == MIG_STATE_CANCELLED ||
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s->state == MIG_STATE_ERROR);
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}
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static MigrationState *migrate_init(const MigrationParams *params)
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{
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MigrationState *s = migrate_get_current();
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int64_t bandwidth_limit = s->bandwidth_limit;
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bool enabled_capabilities[MIGRATION_CAPABILITY_MAX];
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int64_t xbzrle_cache_size = s->xbzrle_cache_size;
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memcpy(enabled_capabilities, s->enabled_capabilities,
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sizeof(enabled_capabilities));
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memset(s, 0, sizeof(*s));
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s->bandwidth_limit = bandwidth_limit;
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s->params = *params;
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memcpy(s->enabled_capabilities, enabled_capabilities,
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sizeof(enabled_capabilities));
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s->xbzrle_cache_size = xbzrle_cache_size;
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s->bandwidth_limit = bandwidth_limit;
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s->state = MIG_STATE_SETUP;
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s->total_time = qemu_get_clock_ms(rt_clock);
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return s;
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}
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static GSList *migration_blockers;
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void migrate_add_blocker(Error *reason)
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{
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migration_blockers = g_slist_prepend(migration_blockers, reason);
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}
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void migrate_del_blocker(Error *reason)
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{
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migration_blockers = g_slist_remove(migration_blockers, reason);
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}
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void qmp_migrate(const char *uri, bool has_blk, bool blk,
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bool has_inc, bool inc, bool has_detach, bool detach,
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Error **errp)
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{
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Error *local_err = NULL;
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MigrationState *s = migrate_get_current();
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MigrationParams params;
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const char *p;
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params.blk = blk;
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params.shared = inc;
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if (s->state == MIG_STATE_ACTIVE) {
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error_set(errp, QERR_MIGRATION_ACTIVE);
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return;
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}
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if (qemu_savevm_state_blocked(errp)) {
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return;
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}
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if (migration_blockers) {
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*errp = error_copy(migration_blockers->data);
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return;
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}
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s = migrate_init(¶ms);
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if (strstart(uri, "tcp:", &p)) {
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tcp_start_outgoing_migration(s, p, &local_err);
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#if !defined(WIN32)
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} else if (strstart(uri, "exec:", &p)) {
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exec_start_outgoing_migration(s, p, &local_err);
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} else if (strstart(uri, "unix:", &p)) {
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unix_start_outgoing_migration(s, p, &local_err);
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} else if (strstart(uri, "fd:", &p)) {
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fd_start_outgoing_migration(s, p, &local_err);
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#endif
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} else {
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error_set(errp, QERR_INVALID_PARAMETER_VALUE, "uri", "a valid migration protocol");
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return;
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}
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if (local_err) {
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migrate_fd_error(s);
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error_propagate(errp, local_err);
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return;
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}
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}
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void qmp_migrate_cancel(Error **errp)
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{
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migrate_fd_cancel(migrate_get_current());
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}
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void qmp_migrate_set_cache_size(int64_t value, Error **errp)
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{
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MigrationState *s = migrate_get_current();
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/* Check for truncation */
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if (value != (size_t)value) {
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error_set(errp, QERR_INVALID_PARAMETER_VALUE, "cache size",
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"exceeding address space");
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return;
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}
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s->xbzrle_cache_size = xbzrle_cache_resize(value);
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}
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int64_t qmp_query_migrate_cache_size(Error **errp)
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{
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return migrate_xbzrle_cache_size();
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}
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void qmp_migrate_set_speed(int64_t value, Error **errp)
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{
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MigrationState *s;
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if (value < 0) {
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value = 0;
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}
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s = migrate_get_current();
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s->bandwidth_limit = value;
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qemu_file_set_rate_limit(s->file, s->bandwidth_limit);
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}
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void qmp_migrate_set_downtime(double value, Error **errp)
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{
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value *= 1e9;
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value = MAX(0, MIN(UINT64_MAX, value));
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max_downtime = (uint64_t)value;
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}
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int migrate_use_xbzrle(void)
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{
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MigrationState *s;
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s = migrate_get_current();
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return s->enabled_capabilities[MIGRATION_CAPABILITY_XBZRLE];
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}
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int64_t migrate_xbzrle_cache_size(void)
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{
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MigrationState *s;
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s = migrate_get_current();
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return s->xbzrle_cache_size;
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}
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/* migration thread support */
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static ssize_t buffered_flush(MigrationState *s)
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{
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size_t offset = 0;
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|
ssize_t ret = 0;
|
|
|
|
DPRINTF("flushing %zu byte(s) of data\n", s->buffer_size);
|
|
|
|
while (s->bytes_xfer < s->xfer_limit && offset < s->buffer_size) {
|
|
size_t to_send = MIN(s->buffer_size - offset, s->xfer_limit - s->bytes_xfer);
|
|
ret = migrate_fd_put_buffer(s, s->buffer + offset, to_send);
|
|
if (ret <= 0) {
|
|
DPRINTF("error flushing data, %zd\n", ret);
|
|
break;
|
|
} else {
|
|
DPRINTF("flushed %zd byte(s)\n", ret);
|
|
offset += ret;
|
|
s->bytes_xfer += ret;
|
|
}
|
|
}
|
|
|
|
DPRINTF("flushed %zu of %zu byte(s)\n", offset, s->buffer_size);
|
|
memmove(s->buffer, s->buffer + offset, s->buffer_size - offset);
|
|
s->buffer_size -= offset;
|
|
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
return offset;
|
|
}
|
|
|
|
static int buffered_put_buffer(void *opaque, const uint8_t *buf,
|
|
int64_t pos, int size)
|
|
{
|
|
MigrationState *s = opaque;
|
|
ssize_t error;
|
|
|
|
DPRINTF("putting %d bytes at %" PRId64 "\n", size, pos);
|
|
|
|
error = qemu_file_get_error(s->file);
|
|
if (error) {
|
|
DPRINTF("flush when error, bailing: %s\n", strerror(-error));
|
|
return error;
|
|
}
|
|
|
|
if (size <= 0) {
|
|
return size;
|
|
}
|
|
|
|
if (size > (s->buffer_capacity - s->buffer_size)) {
|
|
DPRINTF("increasing buffer capacity from %zu by %zu\n",
|
|
s->buffer_capacity, size + 1024);
|
|
|
|
s->buffer_capacity += size + 1024;
|
|
|
|
s->buffer = g_realloc(s->buffer, s->buffer_capacity);
|
|
}
|
|
|
|
memcpy(s->buffer + s->buffer_size, buf, size);
|
|
s->buffer_size += size;
|
|
|
|
return size;
|
|
}
|
|
|
|
static int buffered_close(void *opaque)
|
|
{
|
|
MigrationState *s = opaque;
|
|
ssize_t ret = 0;
|
|
int ret2;
|
|
|
|
DPRINTF("closing\n");
|
|
|
|
s->xfer_limit = INT_MAX;
|
|
while (!qemu_file_get_error(s->file) && s->buffer_size) {
|
|
ret = buffered_flush(s);
|
|
if (ret < 0) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
ret2 = migrate_fd_close(s);
|
|
if (ret >= 0) {
|
|
ret = ret2;
|
|
}
|
|
s->complete = true;
|
|
return ret;
|
|
}
|
|
|
|
static int buffered_get_fd(void *opaque)
|
|
{
|
|
MigrationState *s = opaque;
|
|
|
|
return s->fd;
|
|
}
|
|
|
|
/*
|
|
* The meaning of the return values is:
|
|
* 0: We can continue sending
|
|
* 1: Time to stop
|
|
* negative: There has been an error
|
|
*/
|
|
static int buffered_rate_limit(void *opaque)
|
|
{
|
|
MigrationState *s = opaque;
|
|
int ret;
|
|
|
|
ret = qemu_file_get_error(s->file);
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
|
|
if (s->bytes_xfer >= s->xfer_limit) {
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int64_t buffered_set_rate_limit(void *opaque, int64_t new_rate)
|
|
{
|
|
MigrationState *s = opaque;
|
|
if (qemu_file_get_error(s->file)) {
|
|
goto out;
|
|
}
|
|
if (new_rate > SIZE_MAX) {
|
|
new_rate = SIZE_MAX;
|
|
}
|
|
|
|
s->xfer_limit = new_rate / XFER_LIMIT_RATIO;
|
|
|
|
out:
|
|
return s->xfer_limit;
|
|
}
|
|
|
|
static int64_t buffered_get_rate_limit(void *opaque)
|
|
{
|
|
MigrationState *s = opaque;
|
|
|
|
return s->xfer_limit;
|
|
}
|
|
|
|
static bool migrate_fd_put_ready(MigrationState *s, uint64_t max_size)
|
|
{
|
|
int ret;
|
|
uint64_t pending_size;
|
|
bool last_round = false;
|
|
|
|
qemu_mutex_lock_iothread();
|
|
if (s->state != MIG_STATE_ACTIVE) {
|
|
DPRINTF("put_ready returning because of non-active state\n");
|
|
qemu_mutex_unlock_iothread();
|
|
return false;
|
|
}
|
|
if (s->first_time) {
|
|
s->first_time = false;
|
|
DPRINTF("beginning savevm\n");
|
|
ret = qemu_savevm_state_begin(s->file, &s->params);
|
|
if (ret < 0) {
|
|
DPRINTF("failed, %d\n", ret);
|
|
migrate_fd_error(s);
|
|
qemu_mutex_unlock_iothread();
|
|
return false;
|
|
}
|
|
}
|
|
|
|
DPRINTF("iterate\n");
|
|
pending_size = qemu_savevm_state_pending(s->file, max_size);
|
|
DPRINTF("pending size %lu max %lu\n", pending_size, max_size);
|
|
if (pending_size >= max_size) {
|
|
ret = qemu_savevm_state_iterate(s->file);
|
|
if (ret < 0) {
|
|
migrate_fd_error(s);
|
|
}
|
|
} else {
|
|
int old_vm_running = runstate_is_running();
|
|
int64_t start_time, end_time;
|
|
|
|
DPRINTF("done iterating\n");
|
|
start_time = qemu_get_clock_ms(rt_clock);
|
|
qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
|
|
if (old_vm_running) {
|
|
vm_stop(RUN_STATE_FINISH_MIGRATE);
|
|
} else {
|
|
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);
|
|
}
|
|
end_time = qemu_get_clock_ms(rt_clock);
|
|
s->total_time = end_time - s->total_time;
|
|
s->downtime = end_time - start_time;
|
|
if (s->state != MIG_STATE_COMPLETED) {
|
|
if (old_vm_running) {
|
|
vm_start();
|
|
}
|
|
}
|
|
last_round = true;
|
|
}
|
|
qemu_mutex_unlock_iothread();
|
|
|
|
return last_round;
|
|
}
|
|
|
|
static void *buffered_file_thread(void *opaque)
|
|
{
|
|
MigrationState *s = opaque;
|
|
int64_t initial_time = qemu_get_clock_ms(rt_clock);
|
|
int64_t max_size = 0;
|
|
bool last_round = false;
|
|
|
|
while (true) {
|
|
int64_t current_time = qemu_get_clock_ms(rt_clock);
|
|
|
|
if (s->complete) {
|
|
break;
|
|
}
|
|
if (current_time >= initial_time + BUFFER_DELAY) {
|
|
uint64_t transferred_bytes = s->bytes_xfer;
|
|
uint64_t time_spent = current_time - initial_time;
|
|
double bandwidth = transferred_bytes / time_spent;
|
|
max_size = bandwidth * migrate_max_downtime() / 1000000;
|
|
|
|
DPRINTF("transferred %" PRIu64 " time_spent %" PRIu64
|
|
" bandwidth %g max_size %" PRId64 "\n",
|
|
transferred_bytes, time_spent, bandwidth, max_size);
|
|
|
|
s->bytes_xfer = 0;
|
|
initial_time = current_time;
|
|
}
|
|
if (!last_round && (s->bytes_xfer >= s->xfer_limit)) {
|
|
/* usleep expects microseconds */
|
|
g_usleep((initial_time + BUFFER_DELAY - current_time)*1000);
|
|
}
|
|
if (buffered_flush(s) < 0) {
|
|
break;
|
|
}
|
|
|
|
DPRINTF("file is ready\n");
|
|
if (s->bytes_xfer < s->xfer_limit) {
|
|
DPRINTF("notifying client\n");
|
|
last_round = migrate_fd_put_ready(s, max_size);
|
|
}
|
|
}
|
|
|
|
g_free(s->buffer);
|
|
return NULL;
|
|
}
|
|
|
|
static const QEMUFileOps buffered_file_ops = {
|
|
.get_fd = buffered_get_fd,
|
|
.put_buffer = buffered_put_buffer,
|
|
.close = buffered_close,
|
|
.rate_limit = buffered_rate_limit,
|
|
.get_rate_limit = buffered_get_rate_limit,
|
|
.set_rate_limit = buffered_set_rate_limit,
|
|
};
|
|
|
|
void migrate_fd_connect(MigrationState *s)
|
|
{
|
|
s->state = MIG_STATE_ACTIVE;
|
|
s->bytes_xfer = 0;
|
|
s->buffer = NULL;
|
|
s->buffer_size = 0;
|
|
s->buffer_capacity = 0;
|
|
|
|
s->first_time = true;
|
|
|
|
s->xfer_limit = s->bandwidth_limit / XFER_LIMIT_RATIO;
|
|
s->complete = false;
|
|
|
|
s->file = qemu_fopen_ops(s, &buffered_file_ops);
|
|
|
|
qemu_thread_create(&s->thread, buffered_file_thread, s,
|
|
QEMU_THREAD_DETACHED);
|
|
notifier_list_notify(&migration_state_notifiers, s);
|
|
}
|