#include "qemu/osdep.h"
#include "sysemu/sysemu.h"
+#include "qapi/error.h"
+#include "qapi/qapi-commands-migration.h"
#include "qemu-file-channel.h"
#include "migration.h"
#include "qemu-file.h"
#include "trace.h"
#include "qemu/error-report.h"
#include "migration/failover.h"
+#ifdef CONFIG_REPLICATION
#include "replication.h"
-#include "qmp-commands.h"
+#endif
+#include "net/colo-compare.h"
+#include "net/colo.h"
+#include "block/block.h"
+#include "qapi/qapi-events-migration.h"
+#include "qapi/qmp/qerror.h"
+#include "sysemu/cpus.h"
+#include "net/filter.h"
static bool vmstate_loading;
+static Notifier packets_compare_notifier;
-#define COLO_BUFFER_BASE_SIZE (4 * 1024 * 1024)
+/* User need to know colo mode after COLO failover */
+static COLOMode last_colo_mode;
-bool colo_supported(void)
-{
- return true;
-}
+#define COLO_BUFFER_BASE_SIZE (4 * 1024 * 1024)
bool migration_in_colo_state(void)
{
static void secondary_vm_do_failover(void)
{
+/* COLO needs enable block-replication */
+#ifdef CONFIG_REPLICATION
int old_state;
MigrationIncomingState *mis = migration_incoming_get_current();
+ Error *local_err = NULL;
/* Can not do failover during the process of VM's loading VMstate, Or
* it will break the secondary VM.
FAILOVER_STATUS_RELAUNCH);
if (old_state != FAILOVER_STATUS_ACTIVE) {
error_report("Unknown error while do failover for secondary VM,"
- "old_state: %s", FailoverStatus_lookup[old_state]);
+ "old_state: %s", FailoverStatus_str(old_state));
}
return;
}
migrate_set_state(&mis->state, MIGRATION_STATUS_COLO,
MIGRATION_STATUS_COMPLETED);
+ replication_stop_all(true, &local_err);
+ if (local_err) {
+ error_report_err(local_err);
+ }
+
+ /* Notify all filters of all NIC to do checkpoint */
+ colo_notify_filters_event(COLO_EVENT_FAILOVER, &local_err);
+ if (local_err) {
+ error_report_err(local_err);
+ }
+
if (!autostart) {
error_report("\"-S\" qemu option will be ignored in secondary side");
/* recover runstate to normal migration finish state */
FAILOVER_STATUS_COMPLETED);
if (old_state != FAILOVER_STATUS_ACTIVE) {
error_report("Incorrect state (%s) while doing failover for "
- "secondary VM", FailoverStatus_lookup[old_state]);
+ "secondary VM", FailoverStatus_str(old_state));
return;
}
/* Notify COLO incoming thread that failover work is finished */
qemu_sem_post(&mis->colo_incoming_sem);
+
/* For Secondary VM, jump to incoming co */
if (mis->migration_incoming_co) {
qemu_coroutine_enter(mis->migration_incoming_co);
}
+#else
+ abort();
+#endif
}
static void primary_vm_do_failover(void)
{
+#ifdef CONFIG_REPLICATION
MigrationState *s = migrate_get_current();
int old_state;
+ Error *local_err = NULL;
migrate_set_state(&s->state, MIGRATION_STATUS_COLO,
MIGRATION_STATUS_COMPLETED);
+ /*
+ * kick COLO thread which might wait at
+ * qemu_sem_wait(&s->colo_checkpoint_sem).
+ */
+ colo_checkpoint_notify(migrate_get_current());
/*
* Wake up COLO thread which may blocked in recv() or send(),
FAILOVER_STATUS_COMPLETED);
if (old_state != FAILOVER_STATUS_ACTIVE) {
error_report("Incorrect state (%s) while doing failover for Primary VM",
- FailoverStatus_lookup[old_state]);
+ FailoverStatus_str(old_state));
return;
}
+
+ replication_stop_all(true, &local_err);
+ if (local_err) {
+ error_report_err(local_err);
+ local_err = NULL;
+ }
+
/* Notify COLO thread that failover work is finished */
qemu_sem_post(&s->colo_exit_sem);
+#else
+ abort();
+#endif
+}
+
+COLOMode get_colo_mode(void)
+{
+ if (migration_in_colo_state()) {
+ return COLO_MODE_PRIMARY;
+ } else if (migration_incoming_in_colo_state()) {
+ return COLO_MODE_SECONDARY;
+ } else {
+ return COLO_MODE_NONE;
+ }
}
void colo_do_failover(MigrationState *s)
vm_stop_force_state(RUN_STATE_COLO);
}
- if (get_colo_mode() == COLO_MODE_PRIMARY) {
+ switch (get_colo_mode()) {
+ case COLO_MODE_PRIMARY:
primary_vm_do_failover();
- } else {
+ break;
+ case COLO_MODE_SECONDARY:
secondary_vm_do_failover();
+ break;
+ default:
+ error_report("colo_do_failover failed because the colo mode"
+ " could not be obtained");
}
}
+#ifdef CONFIG_REPLICATION
void qmp_xen_set_replication(bool enable, bool primary,
bool has_failover, bool failover,
Error **errp)
{
-#ifdef CONFIG_REPLICATION
ReplicationMode mode = primary ?
REPLICATION_MODE_PRIMARY :
REPLICATION_MODE_SECONDARY;
}
replication_stop_all(failover, failover ? NULL : errp);
}
-#else
- abort();
-#endif
}
ReplicationStatus *qmp_query_xen_replication_status(Error **errp)
{
-#ifdef CONFIG_REPLICATION
Error *err = NULL;
ReplicationStatus *s = g_new0(ReplicationStatus, 1);
error_free(err);
return s;
-#else
- abort();
-#endif
}
void qmp_xen_colo_do_checkpoint(Error **errp)
{
-#ifdef CONFIG_REPLICATION
replication_do_checkpoint_all(errp);
-#else
- abort();
+}
#endif
+
+COLOStatus *qmp_query_colo_status(Error **errp)
+{
+ COLOStatus *s = g_new0(COLOStatus, 1);
+
+ s->mode = get_colo_mode();
+ s->last_mode = last_colo_mode;
+
+ switch (failover_get_state()) {
+ case FAILOVER_STATUS_NONE:
+ s->reason = COLO_EXIT_REASON_NONE;
+ break;
+ case FAILOVER_STATUS_COMPLETED:
+ s->reason = COLO_EXIT_REASON_REQUEST;
+ break;
+ default:
+ if (migration_in_colo_state()) {
+ s->reason = COLO_EXIT_REASON_PROCESSING;
+ } else {
+ s->reason = COLO_EXIT_REASON_ERROR;
+ }
+ }
+
+ return s;
}
static void colo_send_message(QEMUFile *f, COLOMessage msg,
if (ret < 0) {
error_setg_errno(errp, -ret, "Can't send COLO message");
}
- trace_colo_send_message(COLOMessage_lookup[msg]);
+ trace_colo_send_message(COLOMessage_str(msg));
}
static void colo_send_message_value(QEMUFile *f, COLOMessage msg,
ret = qemu_file_get_error(f);
if (ret < 0) {
error_setg_errno(errp, -ret, "Failed to send value for message:%s",
- COLOMessage_lookup[msg]);
+ COLOMessage_str(msg));
}
}
error_setg(errp, "%s: Invalid message", __func__);
return msg;
}
- trace_colo_receive_message(COLOMessage_lookup[msg]);
+ trace_colo_receive_message(COLOMessage_str(msg));
return msg;
}
ret = qemu_file_get_error(f);
if (ret < 0) {
error_setg_errno(errp, -ret, "Failed to get value for COLO message: %s",
- COLOMessage_lookup[expect_msg]);
+ COLOMessage_str(expect_msg));
}
return value;
}
goto out;
}
+ colo_notify_compares_event(NULL, COLO_EVENT_CHECKPOINT, &local_err);
+ if (local_err) {
+ goto out;
+ }
+
/* Disable block migration */
migrate_set_block_enabled(false, &local_err);
- qemu_savevm_state_header(fb);
- qemu_savevm_state_begin(fb);
qemu_mutex_lock_iothread();
- qemu_savevm_state_complete_precopy(fb, false);
- qemu_mutex_unlock_iothread();
- qemu_fflush(fb);
+#ifdef CONFIG_REPLICATION
+ replication_do_checkpoint_all(&local_err);
+ if (local_err) {
+ qemu_mutex_unlock_iothread();
+ goto out;
+ }
+#else
+ abort();
+#endif
colo_send_message(s->to_dst_file, COLO_MESSAGE_VMSTATE_SEND, &local_err);
if (local_err) {
+ qemu_mutex_unlock_iothread();
+ goto out;
+ }
+ /* Note: device state is saved into buffer */
+ ret = qemu_save_device_state(fb);
+
+ qemu_mutex_unlock_iothread();
+ if (ret < 0) {
goto out;
}
+ /*
+ * Only save VM's live state, which not including device state.
+ * TODO: We may need a timeout mechanism to prevent COLO process
+ * to be blocked here.
+ */
+ qemu_savevm_live_state(s->to_dst_file);
+
+ qemu_fflush(fb);
+
/*
* We need the size of the VMstate data in Secondary side,
* With which we can decide how much data should be read.
return ret;
}
+static void colo_compare_notify_checkpoint(Notifier *notifier, void *data)
+{
+ colo_checkpoint_notify(data);
+}
+
static void colo_process_checkpoint(MigrationState *s)
{
QIOChannelBuffer *bioc;
Error *local_err = NULL;
int ret;
+ last_colo_mode = get_colo_mode();
+ if (last_colo_mode != COLO_MODE_PRIMARY) {
+ error_report("COLO mode must be COLO_MODE_PRIMARY");
+ return;
+ }
+
failover_init_state();
s->rp_state.from_dst_file = qemu_file_get_return_path(s->to_dst_file);
goto out;
}
+ packets_compare_notifier.notify = colo_compare_notify_checkpoint;
+ colo_compare_register_notifier(&packets_compare_notifier);
+
/*
* Wait for Secondary finish loading VM states and enter COLO
* restore.
object_unref(OBJECT(bioc));
qemu_mutex_lock_iothread();
+#ifdef CONFIG_REPLICATION
+ replication_start_all(REPLICATION_MODE_PRIMARY, &local_err);
+ if (local_err) {
+ qemu_mutex_unlock_iothread();
+ goto out;
+ }
+#else
+ abort();
+#endif
+
vm_start();
qemu_mutex_unlock_iothread();
trace_colo_vm_state_change("stop", "run");
qemu_sem_wait(&s->colo_checkpoint_sem);
+ if (s->state != MIGRATION_STATUS_COLO) {
+ goto out;
+ }
ret = colo_do_checkpoint_transaction(s, bioc, fb);
if (ret < 0) {
goto out;
qemu_fclose(fb);
}
- timer_del(s->colo_delay_timer);
+ /*
+ * There are only two reasons we can get here, some error happened
+ * or the user triggered failover.
+ */
+ switch (failover_get_state()) {
+ case FAILOVER_STATUS_COMPLETED:
+ qapi_event_send_colo_exit(COLO_MODE_PRIMARY,
+ COLO_EXIT_REASON_REQUEST);
+ break;
+ default:
+ qapi_event_send_colo_exit(COLO_MODE_PRIMARY,
+ COLO_EXIT_REASON_ERROR);
+ }
/* Hope this not to be too long to wait here */
qemu_sem_wait(&s->colo_exit_sem);
qemu_sem_destroy(&s->colo_exit_sem);
+
+ /*
+ * It is safe to unregister notifier after failover finished.
+ * Besides, colo_delay_timer and colo_checkpoint_sem can't be
+ * released befor unregister notifier, or there will be use-after-free
+ * error.
+ */
+ colo_compare_unregister_notifier(&packets_compare_notifier);
+ timer_del(s->colo_delay_timer);
+ timer_free(s->colo_delay_timer);
+ qemu_sem_destroy(&s->colo_checkpoint_sem);
+
/*
* Must be called after failover BH is completed,
* Or the failover BH may shutdown the wrong fd that
uint64_t total_size;
uint64_t value;
Error *local_err = NULL;
+ int ret;
+ rcu_register_thread();
qemu_sem_init(&mis->colo_incoming_sem, 0);
migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE,
MIGRATION_STATUS_COLO);
+ last_colo_mode = get_colo_mode();
+ if (last_colo_mode != COLO_MODE_SECONDARY) {
+ error_report("COLO mode must be COLO_MODE_SECONDARY");
+ return NULL;
+ }
+
failover_init_state();
mis->to_src_file = qemu_file_get_return_path(mis->from_src_file);
fb = qemu_fopen_channel_input(QIO_CHANNEL(bioc));
object_unref(OBJECT(bioc));
+ qemu_mutex_lock_iothread();
+#ifdef CONFIG_REPLICATION
+ replication_start_all(REPLICATION_MODE_SECONDARY, &local_err);
+ if (local_err) {
+ qemu_mutex_unlock_iothread();
+ goto out;
+ }
+#else
+ abort();
+#endif
+ vm_start();
+ trace_colo_vm_state_change("stop", "run");
+ qemu_mutex_unlock_iothread();
+
colo_send_message(mis->to_src_file, COLO_MESSAGE_CHECKPOINT_READY,
&local_err);
if (local_err) {
goto out;
}
+ qemu_mutex_lock_iothread();
+ vm_stop_force_state(RUN_STATE_COLO);
+ trace_colo_vm_state_change("run", "stop");
+ qemu_mutex_unlock_iothread();
+
/* FIXME: This is unnecessary for periodic checkpoint mode */
colo_send_message(mis->to_src_file, COLO_MESSAGE_CHECKPOINT_REPLY,
&local_err);
goto out;
}
+ qemu_mutex_lock_iothread();
+ cpu_synchronize_all_pre_loadvm();
+ ret = qemu_loadvm_state_main(mis->from_src_file, mis);
+ qemu_mutex_unlock_iothread();
+
+ if (ret < 0) {
+ error_report("Load VM's live state (ram) error");
+ goto out;
+ }
+
value = colo_receive_message_value(mis->from_src_file,
COLO_MESSAGE_VMSTATE_SIZE, &local_err);
if (local_err) {
}
qemu_mutex_lock_iothread();
- qemu_system_reset(SHUTDOWN_CAUSE_NONE);
vmstate_loading = true;
- if (qemu_loadvm_state(fb) < 0) {
- error_report("COLO: loadvm failed");
+ ret = qemu_load_device_state(fb);
+ if (ret < 0) {
+ error_report("COLO: load device state failed");
+ qemu_mutex_unlock_iothread();
+ goto out;
+ }
+
+#ifdef CONFIG_REPLICATION
+ replication_get_error_all(&local_err);
+ if (local_err) {
+ qemu_mutex_unlock_iothread();
+ goto out;
+ }
+
+ /* discard colo disk buffer */
+ replication_do_checkpoint_all(&local_err);
+ if (local_err) {
+ qemu_mutex_unlock_iothread();
+ goto out;
+ }
+#else
+ abort();
+#endif
+ /* Notify all filters of all NIC to do checkpoint */
+ colo_notify_filters_event(COLO_EVENT_CHECKPOINT, &local_err);
+
+ if (local_err) {
qemu_mutex_unlock_iothread();
goto out;
}
vmstate_loading = false;
+ vm_start();
+ trace_colo_vm_state_change("stop", "run");
qemu_mutex_unlock_iothread();
if (failover_get_state() == FAILOVER_STATUS_RELAUNCH) {
error_report_err(local_err);
}
+ /*
+ * There are only two reasons we can get here, some error happened
+ * or the user triggered failover.
+ */
+ switch (failover_get_state()) {
+ case FAILOVER_STATUS_COMPLETED:
+ qapi_event_send_colo_exit(COLO_MODE_SECONDARY,
+ COLO_EXIT_REASON_REQUEST);
+ break;
+ default:
+ qapi_event_send_colo_exit(COLO_MODE_SECONDARY,
+ COLO_EXIT_REASON_ERROR);
+ }
+
if (fb) {
qemu_fclose(fb);
}
/* Must be called after failover BH is completed */
if (mis->to_src_file) {
qemu_fclose(mis->to_src_file);
+ mis->to_src_file = NULL;
}
- migration_incoming_exit_colo();
+ rcu_unregister_thread();
return NULL;
}
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