configure --enable-colo/--disable-colo to switch COLO support on/off. COLO feature doesn't depend on any other external libraries, So here it is reasonable to enable COLO by default, to avoid re-compile QEMU if users want to use this capability. Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com> Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com> Signed-off-by: Gonglei <arei.gonglei@huawei.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Amit Shah <amit.shah@redhat.com> Signed-off-by: Amit Shah <amit@amitshah.net>
530 lines
14 KiB
C
530 lines
14 KiB
C
/*
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* COarse-grain LOck-stepping Virtual Machines for Non-stop Service (COLO)
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* (a.k.a. Fault Tolerance or Continuous Replication)
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*
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* Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
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* Copyright (c) 2016 FUJITSU LIMITED
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* Copyright (c) 2016 Intel Corporation
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or
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* later. See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qemu/timer.h"
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#include "sysemu/sysemu.h"
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#include "migration/colo.h"
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#include "io/channel-buffer.h"
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#include "trace.h"
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#include "qemu/error-report.h"
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#include "qapi/error.h"
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#include "migration/failover.h"
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#define COLO_BUFFER_BASE_SIZE (4 * 1024 * 1024)
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bool colo_supported(void)
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{
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return true;
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}
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bool migration_in_colo_state(void)
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{
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MigrationState *s = migrate_get_current();
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return (s->state == MIGRATION_STATUS_COLO);
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}
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bool migration_incoming_in_colo_state(void)
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{
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MigrationIncomingState *mis = migration_incoming_get_current();
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return mis && (mis->state == MIGRATION_STATUS_COLO);
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}
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static bool colo_runstate_is_stopped(void)
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{
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return runstate_check(RUN_STATE_COLO) || !runstate_is_running();
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}
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static void secondary_vm_do_failover(void)
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{
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int old_state;
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MigrationIncomingState *mis = migration_incoming_get_current();
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migrate_set_state(&mis->state, MIGRATION_STATUS_COLO,
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MIGRATION_STATUS_COMPLETED);
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if (!autostart) {
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error_report("\"-S\" qemu option will be ignored in secondary side");
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/* recover runstate to normal migration finish state */
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autostart = true;
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}
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old_state = failover_set_state(FAILOVER_STATUS_ACTIVE,
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FAILOVER_STATUS_COMPLETED);
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if (old_state != FAILOVER_STATUS_ACTIVE) {
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error_report("Incorrect state (%s) while doing failover for "
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"secondary VM", FailoverStatus_lookup[old_state]);
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return;
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}
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/* For Secondary VM, jump to incoming co */
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if (mis->migration_incoming_co) {
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qemu_coroutine_enter(mis->migration_incoming_co);
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}
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}
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static void primary_vm_do_failover(void)
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{
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MigrationState *s = migrate_get_current();
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int old_state;
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migrate_set_state(&s->state, MIGRATION_STATUS_COLO,
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MIGRATION_STATUS_COMPLETED);
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old_state = failover_set_state(FAILOVER_STATUS_ACTIVE,
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FAILOVER_STATUS_COMPLETED);
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if (old_state != FAILOVER_STATUS_ACTIVE) {
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error_report("Incorrect state (%s) while doing failover for Primary VM",
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FailoverStatus_lookup[old_state]);
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return;
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}
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}
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void colo_do_failover(MigrationState *s)
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{
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/* Make sure VM stopped while failover happened. */
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if (!colo_runstate_is_stopped()) {
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vm_stop_force_state(RUN_STATE_COLO);
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}
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if (get_colo_mode() == COLO_MODE_PRIMARY) {
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primary_vm_do_failover();
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} else {
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secondary_vm_do_failover();
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}
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}
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static void colo_send_message(QEMUFile *f, COLOMessage msg,
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Error **errp)
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{
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int ret;
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if (msg >= COLO_MESSAGE__MAX) {
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error_setg(errp, "%s: Invalid message", __func__);
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return;
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}
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qemu_put_be32(f, msg);
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qemu_fflush(f);
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ret = qemu_file_get_error(f);
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if (ret < 0) {
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error_setg_errno(errp, -ret, "Can't send COLO message");
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}
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trace_colo_send_message(COLOMessage_lookup[msg]);
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}
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static void colo_send_message_value(QEMUFile *f, COLOMessage msg,
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uint64_t value, Error **errp)
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{
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Error *local_err = NULL;
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int ret;
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colo_send_message(f, msg, &local_err);
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if (local_err) {
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error_propagate(errp, local_err);
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return;
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}
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qemu_put_be64(f, value);
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qemu_fflush(f);
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ret = qemu_file_get_error(f);
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if (ret < 0) {
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error_setg_errno(errp, -ret, "Failed to send value for message:%s",
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COLOMessage_lookup[msg]);
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}
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}
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static COLOMessage colo_receive_message(QEMUFile *f, Error **errp)
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{
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COLOMessage msg;
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int ret;
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msg = qemu_get_be32(f);
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ret = qemu_file_get_error(f);
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if (ret < 0) {
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error_setg_errno(errp, -ret, "Can't receive COLO message");
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return msg;
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}
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if (msg >= COLO_MESSAGE__MAX) {
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error_setg(errp, "%s: Invalid message", __func__);
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return msg;
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}
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trace_colo_receive_message(COLOMessage_lookup[msg]);
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return msg;
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}
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static void colo_receive_check_message(QEMUFile *f, COLOMessage expect_msg,
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Error **errp)
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{
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COLOMessage msg;
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Error *local_err = NULL;
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msg = colo_receive_message(f, &local_err);
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if (local_err) {
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error_propagate(errp, local_err);
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return;
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}
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if (msg != expect_msg) {
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error_setg(errp, "Unexpected COLO message %d, expected %d",
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msg, expect_msg);
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}
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}
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static uint64_t colo_receive_message_value(QEMUFile *f, uint32_t expect_msg,
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Error **errp)
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{
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Error *local_err = NULL;
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uint64_t value;
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int ret;
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colo_receive_check_message(f, expect_msg, &local_err);
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if (local_err) {
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error_propagate(errp, local_err);
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return 0;
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}
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value = qemu_get_be64(f);
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ret = qemu_file_get_error(f);
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if (ret < 0) {
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error_setg_errno(errp, -ret, "Failed to get value for COLO message: %s",
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COLOMessage_lookup[expect_msg]);
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}
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return value;
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}
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static int colo_do_checkpoint_transaction(MigrationState *s,
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QIOChannelBuffer *bioc,
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QEMUFile *fb)
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{
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Error *local_err = NULL;
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int ret = -1;
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colo_send_message(s->to_dst_file, COLO_MESSAGE_CHECKPOINT_REQUEST,
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&local_err);
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if (local_err) {
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goto out;
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}
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colo_receive_check_message(s->rp_state.from_dst_file,
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COLO_MESSAGE_CHECKPOINT_REPLY, &local_err);
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if (local_err) {
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goto out;
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}
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/* Reset channel-buffer directly */
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qio_channel_io_seek(QIO_CHANNEL(bioc), 0, 0, NULL);
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bioc->usage = 0;
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qemu_mutex_lock_iothread();
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if (failover_get_state() != FAILOVER_STATUS_NONE) {
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qemu_mutex_unlock_iothread();
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goto out;
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}
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vm_stop_force_state(RUN_STATE_COLO);
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qemu_mutex_unlock_iothread();
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trace_colo_vm_state_change("run", "stop");
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/*
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* Failover request bh could be called after vm_stop_force_state(),
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* So we need check failover_request_is_active() again.
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*/
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if (failover_get_state() != FAILOVER_STATUS_NONE) {
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goto out;
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}
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/* Disable block migration */
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s->params.blk = 0;
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s->params.shared = 0;
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qemu_savevm_state_header(fb);
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qemu_savevm_state_begin(fb, &s->params);
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qemu_mutex_lock_iothread();
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qemu_savevm_state_complete_precopy(fb, false);
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qemu_mutex_unlock_iothread();
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qemu_fflush(fb);
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colo_send_message(s->to_dst_file, COLO_MESSAGE_VMSTATE_SEND, &local_err);
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if (local_err) {
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goto out;
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}
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/*
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* We need the size of the VMstate data in Secondary side,
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* With which we can decide how much data should be read.
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*/
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colo_send_message_value(s->to_dst_file, COLO_MESSAGE_VMSTATE_SIZE,
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bioc->usage, &local_err);
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if (local_err) {
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goto out;
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}
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qemu_put_buffer(s->to_dst_file, bioc->data, bioc->usage);
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qemu_fflush(s->to_dst_file);
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ret = qemu_file_get_error(s->to_dst_file);
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if (ret < 0) {
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goto out;
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}
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colo_receive_check_message(s->rp_state.from_dst_file,
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COLO_MESSAGE_VMSTATE_RECEIVED, &local_err);
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if (local_err) {
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goto out;
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}
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colo_receive_check_message(s->rp_state.from_dst_file,
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COLO_MESSAGE_VMSTATE_LOADED, &local_err);
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if (local_err) {
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goto out;
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}
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ret = 0;
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qemu_mutex_lock_iothread();
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vm_start();
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qemu_mutex_unlock_iothread();
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trace_colo_vm_state_change("stop", "run");
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out:
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if (local_err) {
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error_report_err(local_err);
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}
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return ret;
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}
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static void colo_process_checkpoint(MigrationState *s)
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{
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QIOChannelBuffer *bioc;
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QEMUFile *fb = NULL;
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int64_t current_time, checkpoint_time = qemu_clock_get_ms(QEMU_CLOCK_HOST);
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Error *local_err = NULL;
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int ret;
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failover_init_state();
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s->rp_state.from_dst_file = qemu_file_get_return_path(s->to_dst_file);
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if (!s->rp_state.from_dst_file) {
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error_report("Open QEMUFile from_dst_file failed");
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goto out;
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}
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/*
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* Wait for Secondary finish loading VM states and enter COLO
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* restore.
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*/
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colo_receive_check_message(s->rp_state.from_dst_file,
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COLO_MESSAGE_CHECKPOINT_READY, &local_err);
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if (local_err) {
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goto out;
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}
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bioc = qio_channel_buffer_new(COLO_BUFFER_BASE_SIZE);
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fb = qemu_fopen_channel_output(QIO_CHANNEL(bioc));
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object_unref(OBJECT(bioc));
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qemu_mutex_lock_iothread();
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vm_start();
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qemu_mutex_unlock_iothread();
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trace_colo_vm_state_change("stop", "run");
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while (s->state == MIGRATION_STATUS_COLO) {
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if (failover_get_state() != FAILOVER_STATUS_NONE) {
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error_report("failover request");
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goto out;
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}
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current_time = qemu_clock_get_ms(QEMU_CLOCK_HOST);
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if (current_time - checkpoint_time <
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s->parameters.x_checkpoint_delay) {
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int64_t delay_ms;
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delay_ms = s->parameters.x_checkpoint_delay -
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(current_time - checkpoint_time);
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g_usleep(delay_ms * 1000);
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}
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ret = colo_do_checkpoint_transaction(s, bioc, fb);
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if (ret < 0) {
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goto out;
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}
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checkpoint_time = qemu_clock_get_ms(QEMU_CLOCK_HOST);
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}
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out:
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/* Throw the unreported error message after exited from loop */
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if (local_err) {
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error_report_err(local_err);
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}
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if (fb) {
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qemu_fclose(fb);
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}
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if (s->rp_state.from_dst_file) {
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qemu_fclose(s->rp_state.from_dst_file);
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}
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}
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void migrate_start_colo_process(MigrationState *s)
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{
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qemu_mutex_unlock_iothread();
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migrate_set_state(&s->state, MIGRATION_STATUS_ACTIVE,
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MIGRATION_STATUS_COLO);
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colo_process_checkpoint(s);
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qemu_mutex_lock_iothread();
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}
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static void colo_wait_handle_message(QEMUFile *f, int *checkpoint_request,
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Error **errp)
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{
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COLOMessage msg;
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Error *local_err = NULL;
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msg = colo_receive_message(f, &local_err);
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if (local_err) {
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error_propagate(errp, local_err);
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return;
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}
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switch (msg) {
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case COLO_MESSAGE_CHECKPOINT_REQUEST:
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*checkpoint_request = 1;
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break;
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default:
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*checkpoint_request = 0;
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error_setg(errp, "Got unknown COLO message: %d", msg);
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break;
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}
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}
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void *colo_process_incoming_thread(void *opaque)
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{
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MigrationIncomingState *mis = opaque;
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QEMUFile *fb = NULL;
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QIOChannelBuffer *bioc = NULL; /* Cache incoming device state */
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uint64_t total_size;
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uint64_t value;
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Error *local_err = NULL;
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migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE,
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MIGRATION_STATUS_COLO);
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failover_init_state();
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mis->to_src_file = qemu_file_get_return_path(mis->from_src_file);
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if (!mis->to_src_file) {
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error_report("COLO incoming thread: Open QEMUFile to_src_file failed");
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goto out;
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}
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/*
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* Note: the communication between Primary side and Secondary side
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* should be sequential, we set the fd to unblocked in migration incoming
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* coroutine, and here we are in the COLO incoming thread, so it is ok to
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* set the fd back to blocked.
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*/
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qemu_file_set_blocking(mis->from_src_file, true);
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bioc = qio_channel_buffer_new(COLO_BUFFER_BASE_SIZE);
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fb = qemu_fopen_channel_input(QIO_CHANNEL(bioc));
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object_unref(OBJECT(bioc));
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colo_send_message(mis->to_src_file, COLO_MESSAGE_CHECKPOINT_READY,
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&local_err);
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if (local_err) {
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goto out;
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}
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while (mis->state == MIGRATION_STATUS_COLO) {
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int request;
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colo_wait_handle_message(mis->from_src_file, &request, &local_err);
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if (local_err) {
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goto out;
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}
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assert(request);
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if (failover_get_state() != FAILOVER_STATUS_NONE) {
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error_report("failover request");
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goto out;
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}
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/* FIXME: This is unnecessary for periodic checkpoint mode */
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colo_send_message(mis->to_src_file, COLO_MESSAGE_CHECKPOINT_REPLY,
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&local_err);
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if (local_err) {
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goto out;
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}
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colo_receive_check_message(mis->from_src_file,
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COLO_MESSAGE_VMSTATE_SEND, &local_err);
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if (local_err) {
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goto out;
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}
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value = colo_receive_message_value(mis->from_src_file,
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COLO_MESSAGE_VMSTATE_SIZE, &local_err);
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if (local_err) {
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goto out;
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}
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/*
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* Read VM device state data into channel buffer,
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* It's better to re-use the memory allocated.
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* Here we need to handle the channel buffer directly.
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*/
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if (value > bioc->capacity) {
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bioc->capacity = value;
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bioc->data = g_realloc(bioc->data, bioc->capacity);
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}
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total_size = qemu_get_buffer(mis->from_src_file, bioc->data, value);
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if (total_size != value) {
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error_report("Got %" PRIu64 " VMState data, less than expected"
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" %" PRIu64, total_size, value);
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goto out;
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}
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bioc->usage = total_size;
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qio_channel_io_seek(QIO_CHANNEL(bioc), 0, 0, NULL);
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colo_send_message(mis->to_src_file, COLO_MESSAGE_VMSTATE_RECEIVED,
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&local_err);
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if (local_err) {
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goto out;
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}
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qemu_mutex_lock_iothread();
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qemu_system_reset(VMRESET_SILENT);
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if (qemu_loadvm_state(fb) < 0) {
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error_report("COLO: loadvm failed");
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qemu_mutex_unlock_iothread();
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goto out;
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}
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qemu_mutex_unlock_iothread();
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colo_send_message(mis->to_src_file, COLO_MESSAGE_VMSTATE_LOADED,
|
|
&local_err);
|
|
if (local_err) {
|
|
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);
|
|
}
|
|
|
|
if (mis->to_src_file) {
|
|
qemu_fclose(mis->to_src_file);
|
|
}
|
|
migration_incoming_exit_colo();
|
|
|
|
return NULL;
|
|
}
|