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qemu/migration/colo.c
Avihai Horon 8757d5155f migration: Fail migration if switchover-ack is requested after switchover decision 
Switchover ACK is checked only during precopy while the guest is still
running. The last migration_can_switchover() decision and guest stop are
not atomic, so a device may want to request another switchover ACK in
the gap after switchover decision has been made but before the guest is
stopped. Migration would then miss that request, which can increase
downtime.

Cover this case by failing the migration if a switchover-ack was
requested during that time.

Ideally, precopy iterations should be resumed in this case, however,
VFIO doesn't support going back to precopy after being stopped, so
implementing such logic would require non-trivial changes to the guest
start/stop flow. Given the above and that this case should be rare,
failing the migration seems reasonable.

Signed-off-by: Avihai Horon <avihaih@nvidia.com>
Link: https://lore.kernel.org/qemu-devel/20260706085211.13905-9-avihaih@nvidia.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
2026-07-07 07:12:46 +02:00

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/*
* COarse-grain LOck-stepping Virtual Machines for Non-stop Service (COLO)
* (a.k.a. Fault Tolerance or Continuous Replication)
*
* Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
* Copyright (c) 2016 FUJITSU LIMITED
* Copyright (c) 2016 Intel Corporation
*
* This work is licensed under the terms of the GNU GPL, version 2 or
* later. See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "system/system.h"
#include "qapi/error.h"
#include "qapi/qapi-commands-migration.h"
#include "migration.h"
#include "qemu-file.h"
#include "savevm.h"
#include "migration/colo.h"
#include "io/channel-buffer.h"
#include "trace.h"
#include "qemu/error-report.h"
#include "qemu/main-loop.h"
#include "qemu/rcu.h"
#include "migration/failover.h"
#include "migration/ram.h"
#include "block/replication.h"
#include "net/colo-compare.h"
#include "net/colo.h"
#include "block/block.h"
#include "qapi/qapi-events-migration.h"
#include "system/cpus.h"
#include "system/runstate.h"
#include "net/filter.h"
#include "options.h"
static bool vmstate_loading;
static Notifier packets_compare_notifier;
/* User need to know colo mode after COLO failover */
static COLOMode last_colo_mode;
#define COLO_BUFFER_BASE_SIZE (4 * 1024 * 1024)
bool migration_in_colo_state(void)
{
MigrationState *s = migrate_get_current();
return (s->state == MIGRATION_STATUS_COLO);
}
bool migration_incoming_in_colo_state(void)
{
MigrationIncomingState *mis = migration_incoming_get_current();
return mis && (mis->state == MIGRATION_STATUS_COLO);
}
static bool colo_runstate_is_stopped(void)
{
return runstate_check(RUN_STATE_COLO) || !runstate_is_running();
}
static void colo_checkpoint_notify(void)
{
MigrationState *s = migrate_get_current();
int64_t next_notify_time;
qemu_event_set(&s->colo_checkpoint_event);
s->colo_checkpoint_time = qemu_clock_get_ms(QEMU_CLOCK_HOST);
next_notify_time = s->colo_checkpoint_time + migrate_checkpoint_delay();
timer_mod(s->colo_delay_timer, next_notify_time);
}
static void colo_checkpoint_notify_timer(void *opaque)
{
colo_checkpoint_notify();
}
void colo_checkpoint_delay_set(void)
{
if (migration_in_colo_state()) {
colo_checkpoint_notify();
}
}
static void secondary_vm_do_failover(void)
{
/* COLO needs enable block-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.
*/
if (vmstate_loading) {
old_state = failover_set_state(FAILOVER_STATUS_ACTIVE,
FAILOVER_STATUS_RELAUNCH);
if (old_state != FAILOVER_STATUS_ACTIVE) {
error_report("Unknown error while do failover for secondary VM,"
"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);
local_err = NULL;
}
/* 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 */
autostart = true;
}
/*
* Make sure COLO incoming thread not block in recv or send,
* If mis->from_src_file and mis->to_src_file use the same fd,
* The second shutdown() will return -1, we ignore this value,
* It is harmless.
*/
if (mis->from_src_file) {
qemu_file_shutdown(mis->from_src_file);
}
if (mis->to_src_file) {
qemu_file_shutdown(mis->to_src_file);
}
old_state = failover_set_state(FAILOVER_STATUS_ACTIVE,
FAILOVER_STATUS_COMPLETED);
if (old_state != FAILOVER_STATUS_ACTIVE) {
error_report("Incorrect state (%s) while doing failover for "
"secondary VM", FailoverStatus_str(old_state));
return;
}
/* Notify COLO incoming thread that failover work is finished */
qemu_event_set(&mis->colo_incoming_event);
/* For Secondary VM, jump to incoming co */
if (mis->colo_incoming_co) {
qemu_coroutine_enter(mis->colo_incoming_co);
}
}
static void primary_vm_do_failover(void)
{
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();
/*
* Wake up COLO thread which may blocked in recv() or send(),
* The s->rp_state.from_dst_file and s->to_dst_file may use the
* same fd, but we still shutdown the fd for twice, it is harmless.
*/
WITH_QEMU_LOCK_GUARD(&s->qemu_file_lock) {
if (s->to_dst_file) {
qemu_file_shutdown(s->to_dst_file);
}
if (s->rp_state.from_dst_file) {
qemu_file_shutdown(s->rp_state.from_dst_file);
}
}
old_state = failover_set_state(FAILOVER_STATUS_ACTIVE,
FAILOVER_STATUS_COMPLETED);
if (old_state != FAILOVER_STATUS_ACTIVE) {
error_report("Incorrect state (%s) while doing failover for Primary VM",
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_event_set(&s->colo_exit_event);
}
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(void)
{
/* Make sure VM stopped while failover happened. */
if (!colo_runstate_is_stopped()) {
vm_stop_force_state(RUN_STATE_COLO);
}
switch (last_colo_mode = get_colo_mode()) {
case COLO_MODE_PRIMARY:
primary_vm_do_failover();
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");
}
}
void qmp_xen_set_replication(bool enable, bool primary,
bool has_failover, bool failover,
Error **errp)
{
ReplicationMode mode = primary ?
REPLICATION_MODE_PRIMARY :
REPLICATION_MODE_SECONDARY;
if (has_failover && enable) {
error_setg(errp, "Parameter 'failover' is only for"
" stopping replication");
return;
}
if (enable) {
replication_start_all(mode, errp);
} else {
if (!has_failover) {
failover = NULL;
}
replication_stop_all(failover, failover ? NULL : errp);
}
}
ReplicationStatus *qmp_query_xen_replication_status(Error **errp)
{
Error *err = NULL;
ReplicationStatus *s = g_new0(ReplicationStatus, 1);
replication_get_error_all(&err);
if (err) {
s->error = true;
s->desc = g_strdup(error_get_pretty(err));
} else {
s->error = false;
}
error_free(err);
return s;
}
void qmp_xen_colo_do_checkpoint(Error **errp)
{
Error *err = NULL;
replication_do_checkpoint_all(&err);
if (err) {
error_propagate(errp, err);
return;
}
/* Notify all filters of all NIC to do checkpoint */
colo_notify_filters_event(COLO_EVENT_CHECKPOINT, errp);
}
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,
Error **errp)
{
int ret;
if (msg >= COLO_MESSAGE__MAX) {
error_setg(errp, "%s: Invalid message", __func__);
return;
}
qemu_put_be32(f, msg);
ret = qemu_fflush(f);
if (ret < 0) {
error_setg_errno(errp, -ret, "Can't send COLO message");
}
trace_colo_send_message(COLOMessage_str(msg));
}
static void colo_send_message_value(QEMUFile *f, COLOMessage msg,
uint64_t value, Error **errp)
{
Error *local_err = NULL;
int ret;
colo_send_message(f, msg, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
qemu_put_be64(f, value);
ret = qemu_fflush(f);
if (ret < 0) {
error_setg_errno(errp, -ret, "Failed to send value for message:%s",
COLOMessage_str(msg));
}
}
static COLOMessage colo_receive_message(QEMUFile *f, Error **errp)
{
COLOMessage msg;
int ret;
msg = qemu_get_be32(f);
ret = qemu_file_get_error(f);
if (ret < 0) {
error_setg_errno(errp, -ret, "Can't receive COLO message");
return msg;
}
if (msg >= COLO_MESSAGE__MAX) {
error_setg(errp, "%s: Invalid message", __func__);
return msg;
}
trace_colo_receive_message(COLOMessage_str(msg));
return msg;
}
static void colo_receive_check_message(QEMUFile *f, COLOMessage expect_msg,
Error **errp)
{
COLOMessage msg;
Error *local_err = NULL;
msg = colo_receive_message(f, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
if (msg != expect_msg) {
error_setg(errp, "Unexpected COLO message %d, expected %d",
msg, expect_msg);
}
}
static uint64_t colo_receive_message_value(QEMUFile *f, uint32_t expect_msg,
Error **errp)
{
Error *local_err = NULL;
uint64_t value;
int ret;
colo_receive_check_message(f, expect_msg, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return 0;
}
value = qemu_get_be64(f);
ret = qemu_file_get_error(f);
if (ret < 0) {
error_setg_errno(errp, -ret, "Failed to get value for COLO message: %s",
COLOMessage_str(expect_msg));
}
return value;
}
static int colo_do_checkpoint_transaction(MigrationState *s,
QIOChannelBuffer *bioc,
QEMUFile *fb)
{
Error *local_err = NULL;
MigPendingData pending = {};
int ret = -1;
colo_send_message(s->to_dst_file, COLO_MESSAGE_CHECKPOINT_REQUEST,
&local_err);
if (local_err) {
goto out;
}
colo_receive_check_message(s->rp_state.from_dst_file,
COLO_MESSAGE_CHECKPOINT_REPLY, &local_err);
if (local_err) {
goto out;
}
/* Reset channel-buffer directly */
qio_channel_io_seek(QIO_CHANNEL(bioc), 0, 0, NULL);
bioc->usage = 0;
bql_lock();
if (failover_get_state() != FAILOVER_STATUS_NONE) {
bql_unlock();
goto out;
}
vm_stop_force_state(RUN_STATE_COLO);
bql_unlock();
trace_colo_vm_state_change("run", "stop");
/*
* Failover request bh could be called after vm_stop_force_state(),
* So we need check failover_request_is_active() again.
*/
if (failover_get_state() != FAILOVER_STATUS_NONE) {
goto out;
}
bql_lock();
replication_do_checkpoint_all(&local_err);
if (local_err) {
bql_unlock();
goto out;
}
colo_send_message(s->to_dst_file, COLO_MESSAGE_VMSTATE_SEND, &local_err);
if (local_err) {
bql_unlock();
goto out;
}
/* Note: device state is saved into buffer */
ret = qemu_save_device_state(fb, &local_err);
if (ret < 0) {
bql_unlock();
goto out;
}
if (migrate_auto_converge()) {
mig_throttle_counter_reset();
}
/*
* Run the final pending query so migration modules can flush their dirty
* state (e.g., RAM syncs its dirty bitmap) before this checkpoint's live
* state is saved. Unlike a regular switchover, COLO reaches completion
* repeatedly for every checkpoint, so this must be done on each one.
*/
if (!qemu_savevm_query_pending_final(s, &pending, &local_err)) {
ret = -1;
bql_unlock();
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_state_complete_precopy_iterable(s->to_dst_file, false);
qemu_savevm_state_end(s->to_dst_file);
bql_unlock();
/*
* We need the size of the VMstate data in Secondary side,
* With which we can decide how much data should be read.
*
* Flush the qemufile cache to make sure both bioc->usage and
* bioc->data contains the latest info.
*/
qemu_fflush(fb);
colo_send_message_value(s->to_dst_file, COLO_MESSAGE_VMSTATE_SIZE,
bioc->usage, &local_err);
if (local_err) {
goto out;
}
/* We can use async put because flush happens right away */
qemu_put_buffer_async(s->to_dst_file, bioc->data, bioc->usage, false);
ret = qemu_fflush(s->to_dst_file);
if (ret < 0) {
goto out;
}
colo_receive_check_message(s->rp_state.from_dst_file,
COLO_MESSAGE_VMSTATE_RECEIVED, &local_err);
if (local_err) {
goto out;
}
qemu_event_reset(&s->colo_checkpoint_event);
colo_notify_compares_event(NULL, COLO_EVENT_CHECKPOINT, &local_err);
if (local_err) {
goto out;
}
colo_receive_check_message(s->rp_state.from_dst_file,
COLO_MESSAGE_VMSTATE_LOADED, &local_err);
if (local_err) {
goto out;
}
ret = 0;
bql_lock();
vm_start();
bql_unlock();
trace_colo_vm_state_change("stop", "run");
out:
if (local_err) {
error_report_err(local_err);
}
return ret;
}
static void colo_compare_notify_checkpoint(Notifier *notifier, void *data)
{
colo_checkpoint_notify();
}
static void colo_process_checkpoint(MigrationState *s)
{
QIOChannelBuffer *bioc;
QEMUFile *fb = NULL;
Error *local_err = NULL;
int ret;
assert(s->rp_state.from_dst_file);
assert(!s->rp_state.rp_thread_created);
if (get_colo_mode() != COLO_MODE_PRIMARY) {
error_report("COLO mode must be COLO_MODE_PRIMARY");
return;
}
failover_init_state();
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.
*/
colo_receive_check_message(s->rp_state.from_dst_file,
COLO_MESSAGE_CHECKPOINT_READY, &local_err);
if (local_err) {
goto out;
}
bioc = qio_channel_buffer_new(COLO_BUFFER_BASE_SIZE);
fb = qemu_file_new_output(QIO_CHANNEL(bioc));
object_unref(OBJECT(bioc));
bql_lock();
replication_start_all(REPLICATION_MODE_PRIMARY, &local_err);
if (local_err) {
bql_unlock();
goto out;
}
vm_start();
bql_unlock();
trace_colo_vm_state_change("stop", "run");
timer_mod(s->colo_delay_timer, qemu_clock_get_ms(QEMU_CLOCK_HOST) +
migrate_checkpoint_delay());
while (s->state == MIGRATION_STATUS_COLO) {
if (failover_get_state() != FAILOVER_STATUS_NONE) {
error_report("failover request");
goto out;
}
qemu_event_wait(&s->colo_checkpoint_event);
if (s->state != MIGRATION_STATUS_COLO) {
goto out;
}
ret = colo_do_checkpoint_transaction(s, bioc, fb);
if (ret < 0) {
goto out;
}
}
out:
/* Throw the unreported error message after exited from loop */
if (local_err) {
error_report_err(local_err);
}
if (fb) {
qemu_fclose(fb);
}
/*
* 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_event_wait(&s->colo_exit_event);
qemu_event_destroy(&s->colo_exit_event);
/*
* It is safe to unregister notifier after failover finished.
* Besides, colo_delay_timer and colo_checkpoint_sem can't be
* released before unregister notifier, or there will be use-after-free
* error.
*/
colo_compare_unregister_notifier(&packets_compare_notifier);
timer_free(s->colo_delay_timer);
qemu_event_destroy(&s->colo_checkpoint_event);
}
void migrate_start_colo_process(MigrationState *s)
{
bql_unlock();
qemu_event_init(&s->colo_checkpoint_event, false);
s->colo_delay_timer = timer_new_ms(QEMU_CLOCK_HOST,
colo_checkpoint_notify_timer, NULL);
qemu_event_init(&s->colo_exit_event, false);
colo_process_checkpoint(s);
bql_lock();
}
static void colo_incoming_process_checkpoint(MigrationIncomingState *mis,
QEMUFile *fb, QIOChannelBuffer *bioc, Error **errp)
{
uint64_t total_size;
uint64_t value;
Error *local_err = NULL;
int ret;
bql_lock();
vm_stop_force_state(RUN_STATE_COLO);
bql_unlock();
trace_colo_vm_state_change("run", "stop");
/* FIXME: This is unnecessary for periodic checkpoint mode */
colo_send_message(mis->to_src_file, COLO_MESSAGE_CHECKPOINT_REPLY,
&local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
colo_receive_check_message(mis->from_src_file,
COLO_MESSAGE_VMSTATE_SEND, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
ret = qemu_loadvm_state_main(mis->from_src_file, mis, errp);
if (ret < 0) {
return;
}
value = colo_receive_message_value(mis->from_src_file,
COLO_MESSAGE_VMSTATE_SIZE, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
/*
* Read VM device state data into channel buffer,
* It's better to re-use the memory allocated.
* Here we need to handle the channel buffer directly.
*/
if (value > bioc->capacity) {
bioc->capacity = value;
bioc->data = g_realloc(bioc->data, bioc->capacity);
}
total_size = qemu_get_buffer(mis->from_src_file, bioc->data, value);
if (total_size != value) {
error_setg(errp, "Got %" PRIu64 " VMState data, less than expected"
" %" PRIu64, total_size, value);
return;
}
bioc->usage = total_size;
qio_channel_io_seek(QIO_CHANNEL(bioc), 0, 0, NULL);
colo_send_message(mis->to_src_file, COLO_MESSAGE_VMSTATE_RECEIVED,
&local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
bql_lock();
vmstate_loading = true;
/*
* With colo we load device vmstate during each checkpoint, on top of
* a vm that was already running. Some devices expect a reset before
* loading vmstate on such a previously running vm.
*
* NOTE: qemu_system_reset() calls cpu_synchronize_all_states() for us
*/
qemu_system_reset(SHUTDOWN_CAUSE_SNAPSHOT_LOAD);
colo_flush_ram_cache();
ret = qemu_load_device_state(fb, errp);
if (ret < 0) {
vmstate_loading = false;
bql_unlock();
return;
}
replication_get_error_all(&local_err);
if (local_err) {
error_propagate(errp, local_err);
vmstate_loading = false;
bql_unlock();
return;
}
/* discard colo disk buffer */
replication_do_checkpoint_all(&local_err);
if (local_err) {
error_propagate(errp, local_err);
vmstate_loading = false;
bql_unlock();
return;
}
/* Notify all filters of all NIC to do checkpoint */
colo_notify_filters_event(COLO_EVENT_CHECKPOINT, &local_err);
if (local_err) {
error_propagate(errp, local_err);
vmstate_loading = false;
bql_unlock();
return;
}
vmstate_loading = false;
vm_start();
bql_unlock();
trace_colo_vm_state_change("stop", "run");
if (failover_get_state() == FAILOVER_STATUS_RELAUNCH) {
return;
}
colo_send_message(mis->to_src_file, COLO_MESSAGE_VMSTATE_LOADED,
&local_err);
error_propagate(errp, local_err);
}
static void colo_wait_handle_message(MigrationIncomingState *mis,
QEMUFile *fb, QIOChannelBuffer *bioc, Error **errp)
{
COLOMessage msg;
Error *local_err = NULL;
msg = colo_receive_message(mis->from_src_file, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
switch (msg) {
case COLO_MESSAGE_CHECKPOINT_REQUEST:
colo_incoming_process_checkpoint(mis, fb, bioc, errp);
break;
default:
error_setg(errp, "Got unknown COLO message: %d", msg);
break;
}
}
void colo_shutdown(void)
{
MigrationIncomingState *mis = NULL;
MigrationState *s = NULL;
switch (get_colo_mode()) {
case COLO_MODE_PRIMARY:
s = migrate_get_current();
qemu_event_set(&s->colo_checkpoint_event);
qemu_event_set(&s->colo_exit_event);
break;
case COLO_MODE_SECONDARY:
mis = migration_incoming_get_current();
qemu_event_set(&mis->colo_incoming_event);
break;
default:
break;
}
}
static void *colo_process_incoming_thread(void *opaque)
{
MigrationIncomingState *mis = opaque;
QEMUFile *fb = NULL;
QIOChannelBuffer *bioc = NULL; /* Cache incoming device state */
Error *local_err = NULL;
rcu_register_thread();
qemu_event_init(&mis->colo_incoming_event, false);
migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE,
MIGRATION_STATUS_COLO);
assert(mis->to_src_file);
if (get_colo_mode() != COLO_MODE_SECONDARY) {
error_report("COLO mode must be COLO_MODE_SECONDARY");
return NULL;
}
/* Make sure all file formats throw away their mutable metadata */
bql_lock();
migration_block_activate(&local_err);
bql_unlock();
if (local_err) {
error_report_err(local_err);
return NULL;
}
failover_init_state();
/*
* Note: the communication between Primary side and Secondary side
* should be sequential, we set the fd to unblocked in migration incoming
* coroutine, and here we are in the COLO incoming thread, so it is ok to
* set the fd back to blocked.
*/
if (!qemu_file_set_blocking(mis->from_src_file, true, &local_err)) {
error_report_err(local_err);
goto out;
}
/*
* rp thread still running on primary side, shut it down to go into
* colo state.
*/
migrate_send_rp_shut(mis, 0);
colo_incoming_start_dirty_log();
bioc = qio_channel_buffer_new(COLO_BUFFER_BASE_SIZE);
fb = qemu_file_new_input(QIO_CHANNEL(bioc));
object_unref(OBJECT(bioc));
bql_lock();
replication_start_all(REPLICATION_MODE_SECONDARY, &local_err);
if (local_err) {
bql_unlock();
goto out;
}
vm_start();
bql_unlock();
trace_colo_vm_state_change("stop", "run");
colo_send_message(mis->to_src_file, COLO_MESSAGE_CHECKPOINT_READY,
&local_err);
if (local_err) {
goto out;
}
while (mis->state == MIGRATION_STATUS_COLO) {
colo_wait_handle_message(mis, fb, bioc, &local_err);
if (local_err) {
error_report_err(local_err);
break;
}
if (failover_get_state() == FAILOVER_STATUS_RELAUNCH) {
failover_set_state(FAILOVER_STATUS_RELAUNCH,
FAILOVER_STATUS_NONE);
failover_request_active(NULL);
break;
}
if (failover_get_state() != FAILOVER_STATUS_NONE) {
error_report("failover request");
break;
}
}
out:
/*
* 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);
}
/* Hope this not to be too long to loop here */
qemu_event_wait(&mis->colo_incoming_event);
qemu_event_destroy(&mis->colo_incoming_event);
rcu_unregister_thread();
return NULL;
}
void coroutine_fn colo_incoming_co(void)
{
MigrationIncomingState *mis = migration_incoming_get_current();
QemuThread th;
assert(bql_locked());
assert(migrate_colo());
qemu_thread_create(&th, MIGRATION_THREAD_DST_COLO,
colo_process_incoming_thread,
mis, QEMU_THREAD_JOINABLE);
mis->colo_incoming_co = qemu_coroutine_self();
qemu_coroutine_yield();
mis->colo_incoming_co = NULL;
bql_unlock();
/* Wait checkpoint incoming thread exit before free resource */
qemu_thread_join(&th);
bql_lock();
}
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