If a user or QMP client enter a bad syntax for the migrate
command in QMP/HMP, then the migrate command will never succeed
from that point on.
For example, if you enter:
(qemu) migrate tcp;0:4444
migrate: Parameter 'uri' expects a valid migration protocol
Then the migrate command will always fail from now on:
(qemu) migrate tcp:0:4444
migrate: There's a migration process in progress
The problem is that qmp_migrate() sets the migration status to
MIG_STATE_SETUP and doesn't reset it on syntax error. This bug
was introduced by commit 29ae8a4133
.
Reviewed-by: Michael R. Hines <mrhines@us.ibm.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
672 lines
19 KiB
C
672 lines
19 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 "qemu/main-loop.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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#include "trace.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 = -1,
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MIG_STATE_NONE,
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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_NONE,
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.bandwidth_limit = MAX_THROTTLE,
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.xbzrle_cache_size = DEFAULT_MIGRATE_CACHE_SIZE,
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.mbps = -1,
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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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#ifdef CONFIG_RDMA
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else if (strstart(uri, "x-rdma:", &p))
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rdma_start_incoming_migration(p, errp);
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#endif
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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", 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_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(EXIT_FAILURE);
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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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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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qemu_set_nonblock(fd);
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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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caps = NULL; /* silence compiler warning */
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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_NONE:
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/* no migration has happened ever */
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break;
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case MIG_STATE_SETUP:
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info->has_status = true;
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info->status = g_strdup("setup");
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info->has_total_time = false;
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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_clock_get_ms(QEMU_CLOCK_REALTIME)
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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_setup_time = true;
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info->setup_time = s->setup_time;
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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->skipped = skipped_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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info->ram->mbps = s->mbps;
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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->has_total_time = true;
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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_setup_time = true;
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info->setup_time = s->setup_time;
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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->skipped = skipped_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->mbps = s->mbps;
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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 || s->state == MIG_STATE_SETUP) {
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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 void migrate_fd_cleanup(void *opaque)
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{
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MigrationState *s = opaque;
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qemu_bh_delete(s->cleanup_bh);
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s->cleanup_bh = NULL;
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if (s->file) {
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DPRINTF("closing file\n");
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qemu_mutex_unlock_iothread();
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qemu_thread_join(&s->thread);
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qemu_mutex_lock_iothread();
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qemu_fclose(s->file);
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s->file = NULL;
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}
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assert(s->state != MIG_STATE_ACTIVE);
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if (s->state != MIG_STATE_COMPLETED) {
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qemu_savevm_state_cancel();
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}
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notifier_list_notify(&migration_state_notifiers, s);
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}
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static void migrate_set_state(MigrationState *s, int old_state, int new_state)
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{
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if (atomic_cmpxchg(&s->state, old_state, new_state) == new_state) {
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trace_migrate_set_state(new_state);
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}
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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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assert(s->file == NULL);
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s->state = MIG_STATE_ERROR;
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trace_migrate_set_state(MIG_STATE_ERROR);
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notifier_list_notify(&migration_state_notifiers, s);
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}
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static void migrate_fd_cancel(MigrationState *s)
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{
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DPRINTF("cancelling migration\n");
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migrate_set_state(s, s->state, MIG_STATE_CANCELLED);
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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_in_setup(MigrationState *s)
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{
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return s->state == MIG_STATE_SETUP;
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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->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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trace_migrate_set_state(MIG_STATE_SETUP);
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s->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
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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 = has_blk && blk;
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params.shared = has_inc && inc;
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if (s->state == MIG_STATE_ACTIVE || s->state == MIG_STATE_SETUP) {
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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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#ifdef CONFIG_RDMA
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} else if (strstart(uri, "x-rdma:", &p)) {
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rdma_start_outgoing_migration(s, p, &local_err);
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#endif
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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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s->state = MIG_STATE_ERROR;
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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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if (value > SIZE_MAX) {
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value = SIZE_MAX;
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}
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s = migrate_get_current();
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s->bandwidth_limit = value;
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if (s->file) {
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qemu_file_set_rate_limit(s->file, s->bandwidth_limit / XFER_LIMIT_RATIO);
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}
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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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|
|
|
bool migrate_rdma_pin_all(void)
|
|
{
|
|
MigrationState *s;
|
|
|
|
s = migrate_get_current();
|
|
|
|
return s->enabled_capabilities[MIGRATION_CAPABILITY_X_RDMA_PIN_ALL];
|
|
}
|
|
|
|
bool migrate_auto_converge(void)
|
|
{
|
|
MigrationState *s;
|
|
|
|
s = migrate_get_current();
|
|
|
|
return s->enabled_capabilities[MIGRATION_CAPABILITY_AUTO_CONVERGE];
|
|
}
|
|
|
|
bool migrate_zero_blocks(void)
|
|
{
|
|
MigrationState *s;
|
|
|
|
s = migrate_get_current();
|
|
|
|
return s->enabled_capabilities[MIGRATION_CAPABILITY_ZERO_BLOCKS];
|
|
}
|
|
|
|
int migrate_use_xbzrle(void)
|
|
{
|
|
MigrationState *s;
|
|
|
|
s = migrate_get_current();
|
|
|
|
return s->enabled_capabilities[MIGRATION_CAPABILITY_XBZRLE];
|
|
}
|
|
|
|
int64_t migrate_xbzrle_cache_size(void)
|
|
{
|
|
MigrationState *s;
|
|
|
|
s = migrate_get_current();
|
|
|
|
return s->xbzrle_cache_size;
|
|
}
|
|
|
|
/* migration thread support */
|
|
|
|
static void *migration_thread(void *opaque)
|
|
{
|
|
MigrationState *s = opaque;
|
|
int64_t initial_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
|
|
int64_t setup_start = qemu_clock_get_ms(QEMU_CLOCK_HOST);
|
|
int64_t initial_bytes = 0;
|
|
int64_t max_size = 0;
|
|
int64_t start_time = initial_time;
|
|
bool old_vm_running = false;
|
|
|
|
DPRINTF("beginning savevm\n");
|
|
qemu_savevm_state_begin(s->file, &s->params);
|
|
|
|
s->setup_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) - setup_start;
|
|
migrate_set_state(s, MIG_STATE_SETUP, MIG_STATE_ACTIVE);
|
|
|
|
DPRINTF("setup complete\n");
|
|
|
|
while (s->state == MIG_STATE_ACTIVE) {
|
|
int64_t current_time;
|
|
uint64_t pending_size;
|
|
|
|
if (!qemu_file_rate_limit(s->file)) {
|
|
DPRINTF("iterate\n");
|
|
pending_size = qemu_savevm_state_pending(s->file, max_size);
|
|
DPRINTF("pending size %" PRIu64 " max %" PRIu64 "\n",
|
|
pending_size, max_size);
|
|
if (pending_size && pending_size >= max_size) {
|
|
qemu_savevm_state_iterate(s->file);
|
|
} else {
|
|
int ret;
|
|
|
|
DPRINTF("done iterating\n");
|
|
qemu_mutex_lock_iothread();
|
|
start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
|
|
qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
|
|
old_vm_running = runstate_is_running();
|
|
|
|
ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
|
|
if (ret >= 0) {
|
|
qemu_file_set_rate_limit(s->file, INT_MAX);
|
|
qemu_savevm_state_complete(s->file);
|
|
}
|
|
qemu_mutex_unlock_iothread();
|
|
|
|
if (ret < 0) {
|
|
migrate_set_state(s, MIG_STATE_ACTIVE, MIG_STATE_ERROR);
|
|
break;
|
|
}
|
|
|
|
if (!qemu_file_get_error(s->file)) {
|
|
migrate_set_state(s, MIG_STATE_ACTIVE, MIG_STATE_COMPLETED);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (qemu_file_get_error(s->file)) {
|
|
migrate_set_state(s, MIG_STATE_ACTIVE, MIG_STATE_ERROR);
|
|
break;
|
|
}
|
|
current_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
|
|
if (current_time >= initial_time + BUFFER_DELAY) {
|
|
uint64_t transferred_bytes = qemu_ftell(s->file) - initial_bytes;
|
|
uint64_t time_spent = current_time - initial_time;
|
|
double bandwidth = transferred_bytes / time_spent;
|
|
max_size = bandwidth * migrate_max_downtime() / 1000000;
|
|
|
|
s->mbps = time_spent ? (((double) transferred_bytes * 8.0) /
|
|
((double) time_spent / 1000.0)) / 1000.0 / 1000.0 : -1;
|
|
|
|
DPRINTF("transferred %" PRIu64 " time_spent %" PRIu64
|
|
" bandwidth %g max_size %" PRId64 "\n",
|
|
transferred_bytes, time_spent, bandwidth, max_size);
|
|
/* if we haven't sent anything, we don't want to recalculate
|
|
10000 is a small enough number for our purposes */
|
|
if (s->dirty_bytes_rate && transferred_bytes > 10000) {
|
|
s->expected_downtime = s->dirty_bytes_rate / bandwidth;
|
|
}
|
|
|
|
qemu_file_reset_rate_limit(s->file);
|
|
initial_time = current_time;
|
|
initial_bytes = qemu_ftell(s->file);
|
|
}
|
|
if (qemu_file_rate_limit(s->file)) {
|
|
/* usleep expects microseconds */
|
|
g_usleep((initial_time + BUFFER_DELAY - current_time)*1000);
|
|
}
|
|
}
|
|
|
|
qemu_mutex_lock_iothread();
|
|
if (s->state == MIG_STATE_COMPLETED) {
|
|
int64_t end_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
|
|
s->total_time = end_time - s->total_time;
|
|
s->downtime = end_time - start_time;
|
|
runstate_set(RUN_STATE_POSTMIGRATE);
|
|
} else {
|
|
if (old_vm_running) {
|
|
vm_start();
|
|
}
|
|
}
|
|
qemu_bh_schedule(s->cleanup_bh);
|
|
qemu_mutex_unlock_iothread();
|
|
|
|
return NULL;
|
|
}
|
|
|
|
void migrate_fd_connect(MigrationState *s)
|
|
{
|
|
s->state = MIG_STATE_SETUP;
|
|
trace_migrate_set_state(MIG_STATE_SETUP);
|
|
|
|
/* This is a best 1st approximation. ns to ms */
|
|
s->expected_downtime = max_downtime/1000000;
|
|
s->cleanup_bh = qemu_bh_new(migrate_fd_cleanup, s);
|
|
|
|
qemu_file_set_rate_limit(s->file,
|
|
s->bandwidth_limit / XFER_LIMIT_RATIO);
|
|
|
|
/* Notify before starting migration thread */
|
|
notifier_list_notify(&migration_state_notifiers, s);
|
|
|
|
qemu_thread_create(&s->thread, migration_thread, s,
|
|
QEMU_THREAD_JOINABLE);
|
|
}
|