[PULL,01/17] migration: Remove spurious files

diff --git a/configs/devices/x86_64-softmmu/x86_64-quintela-devices.mak b/configs/devices/x86_64-softmmu/x86_64-quintela-devices.mak
deleted file mode 100644
index ee2bb8c5c9..0000000000
--- a/configs/devices/x86_64-softmmu/x86_64-quintela-devices.mak
+++ /dev/null
@@ -1,7 +0,0 @@ 
-# Boards:
-#
-CONFIG_ISAPC=n
-CONFIG_I440FX=n
-CONFIG_Q35=n
-CONFIG_MICROVM=y
-
diff --git a/configs/devices/x86_64-softmmu/x86_64-quintela2-devices.mak b/configs/devices/x86_64-softmmu/x86_64-quintela2-devices.mak
deleted file mode 100644
index f7e4dae842..0000000000
--- a/configs/devices/x86_64-softmmu/x86_64-quintela2-devices.mak
+++ /dev/null
@@ -1,6 +0,0 @@ 
-# Boards:
-#
-CONFIG_ISAPC=y
-CONFIG_I440FX=y
-CONFIG_Q35=y
-CONFIG_MICROVM=y
diff --git a/migration/multifd.c.orig b/migration/multifd.c.orig
deleted file mode 100644
index ad89293b4e..0000000000
--- a/migration/multifd.c.orig
+++ /dev/null
@@ -1,1274 +0,0 @@ 
-/*
- * Multifd common code
- *
- * Copyright (c) 2019-2020 Red Hat Inc
- *
- * Authors:
- *  Juan Quintela <quintela@redhat.com>
- *
- * 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 "qemu/rcu.h"
-#include "exec/target_page.h"
-#include "sysemu/sysemu.h"
-#include "exec/ramblock.h"
-#include "qemu/error-report.h"
-#include "qapi/error.h"
-#include "ram.h"
-#include "migration.h"
-#include "socket.h"
-#include "tls.h"
-#include "qemu-file.h"
-#include "trace.h"
-#include "multifd.h"
-
-#include "qemu/yank.h"
-#include "io/channel-socket.h"
-#include "yank_functions.h"
-
-/* Multiple fd's */
-
-#define MULTIFD_MAGIC 0x11223344U
-#define MULTIFD_VERSION 1
-
-typedef struct {
-    uint32_t magic;
-    uint32_t version;
-    unsigned char uuid[16]; /* QemuUUID */
-    uint8_t id;
-    uint8_t unused1[7];     /* Reserved for future use */
-    uint64_t unused2[4];    /* Reserved for future use */
-} __attribute__((packed)) MultiFDInit_t;
-
-/* Multifd without compression */
-
-/**
- * nocomp_send_setup: setup send side
- *
- * For no compression this function does nothing.
- *
- * Returns 0 for success or -1 for error
- *
- * @p: Params for the channel that we are using
- * @errp: pointer to an error
- */
-static int nocomp_send_setup(MultiFDSendParams *p, Error **errp)
-{
-    return 0;
-}
-
-/**
- * nocomp_send_cleanup: cleanup send side
- *
- * For no compression this function does nothing.
- *
- * @p: Params for the channel that we are using
- * @errp: pointer to an error
- */
-static void nocomp_send_cleanup(MultiFDSendParams *p, Error **errp)
-{
-    return;
-}
-
-/**
- * nocomp_send_prepare: prepare date to be able to send
- *
- * For no compression we just have to calculate the size of the
- * packet.
- *
- * Returns 0 for success or -1 for error
- *
- * @p: Params for the channel that we are using
- * @errp: pointer to an error
- */
-static int nocomp_send_prepare(MultiFDSendParams *p, Error **errp)
-{
-    MultiFDPages_t *pages = p->pages;
-
-    for (int i = 0; i < p->normal_num; i++) {
-        p->iov[p->iovs_num].iov_base = pages->block->host + p->normal[i];
-        p->iov[p->iovs_num].iov_len = p->page_size;
-        p->iovs_num++;
-    }
-
-    p->next_packet_size = p->normal_num * p->page_size;
-    p->flags |= MULTIFD_FLAG_NOCOMP;
-    return 0;
-}
-
-/**
- * nocomp_recv_setup: setup receive side
- *
- * For no compression this function does nothing.
- *
- * Returns 0 for success or -1 for error
- *
- * @p: Params for the channel that we are using
- * @errp: pointer to an error
- */
-static int nocomp_recv_setup(MultiFDRecvParams *p, Error **errp)
-{
-    return 0;
-}
-
-/**
- * nocomp_recv_cleanup: setup receive side
- *
- * For no compression this function does nothing.
- *
- * @p: Params for the channel that we are using
- */
-static void nocomp_recv_cleanup(MultiFDRecvParams *p)
-{
-}
-
-/**
- * nocomp_recv_pages: read the data from the channel into actual pages
- *
- * For no compression we just need to read things into the correct place.
- *
- * Returns 0 for success or -1 for error
- *
- * @p: Params for the channel that we are using
- * @errp: pointer to an error
- */
-static int nocomp_recv_pages(MultiFDRecvParams *p, Error **errp)
-{
-    uint32_t flags = p->flags & MULTIFD_FLAG_COMPRESSION_MASK;
-
-    if (flags != MULTIFD_FLAG_NOCOMP) {
-        error_setg(errp, "multifd %u: flags received %x flags expected %x",
-                   p->id, flags, MULTIFD_FLAG_NOCOMP);
-        return -1;
-    }
-    for (int i = 0; i < p->normal_num; i++) {
-        p->iov[i].iov_base = p->host + p->normal[i];
-        p->iov[i].iov_len = p->page_size;
-    }
-    return qio_channel_readv_all(p->c, p->iov, p->normal_num, errp);
-}
-
-static MultiFDMethods multifd_nocomp_ops = {
-    .send_setup = nocomp_send_setup,
-    .send_cleanup = nocomp_send_cleanup,
-    .send_prepare = nocomp_send_prepare,
-    .recv_setup = nocomp_recv_setup,
-    .recv_cleanup = nocomp_recv_cleanup,
-    .recv_pages = nocomp_recv_pages
-};
-
-static MultiFDMethods *multifd_ops[MULTIFD_COMPRESSION__MAX] = {
-    [MULTIFD_COMPRESSION_NONE] = &multifd_nocomp_ops,
-};
-
-void multifd_register_ops(int method, MultiFDMethods *ops)
-{
-    assert(0 < method && method < MULTIFD_COMPRESSION__MAX);
-    multifd_ops[method] = ops;
-}
-
-static int multifd_send_initial_packet(MultiFDSendParams *p, Error **errp)
-{
-    MultiFDInit_t msg = {};
-    int ret;
-
-    msg.magic = cpu_to_be32(MULTIFD_MAGIC);
-    msg.version = cpu_to_be32(MULTIFD_VERSION);
-    msg.id = p->id;
-    memcpy(msg.uuid, &qemu_uuid.data, sizeof(msg.uuid));
-
-    ret = qio_channel_write_all(p->c, (char *)&msg, sizeof(msg), errp);
-    if (ret != 0) {
-        return -1;
-    }
-    return 0;
-}
-
-static int multifd_recv_initial_packet(QIOChannel *c, Error **errp)
-{
-    MultiFDInit_t msg;
-    int ret;
-
-    ret = qio_channel_read_all(c, (char *)&msg, sizeof(msg), errp);
-    if (ret != 0) {
-        return -1;
-    }
-
-    msg.magic = be32_to_cpu(msg.magic);
-    msg.version = be32_to_cpu(msg.version);
-
-    if (msg.magic != MULTIFD_MAGIC) {
-        error_setg(errp, "multifd: received packet magic %x "
-                   "expected %x", msg.magic, MULTIFD_MAGIC);
-        return -1;
-    }
-
-    if (msg.version != MULTIFD_VERSION) {
-        error_setg(errp, "multifd: received packet version %u "
-                   "expected %u", msg.version, MULTIFD_VERSION);
-        return -1;
-    }
-
-    if (memcmp(msg.uuid, &qemu_uuid, sizeof(qemu_uuid))) {
-        char *uuid = qemu_uuid_unparse_strdup(&qemu_uuid);
-        char *msg_uuid = qemu_uuid_unparse_strdup((const QemuUUID *)msg.uuid);
-
-        error_setg(errp, "multifd: received uuid '%s' and expected "
-                   "uuid '%s' for channel %hhd", msg_uuid, uuid, msg.id);
-        g_free(uuid);
-        g_free(msg_uuid);
-        return -1;
-    }
-
-    if (msg.id > migrate_multifd_channels()) {
-        error_setg(errp, "multifd: received channel version %u "
-                   "expected %u", msg.version, MULTIFD_VERSION);
-        return -1;
-    }
-
-    return msg.id;
-}
-
-static MultiFDPages_t *multifd_pages_init(size_t size)
-{
-    MultiFDPages_t *pages = g_new0(MultiFDPages_t, 1);
-
-    pages->allocated = size;
-    pages->offset = g_new0(ram_addr_t, size);
-
-    return pages;
-}
-
-static void multifd_pages_clear(MultiFDPages_t *pages)
-{
-    pages->num = 0;
-    pages->allocated = 0;
-    pages->packet_num = 0;
-    pages->block = NULL;
-    g_free(pages->offset);
-    pages->offset = NULL;
-    g_free(pages);
-}
-
-static void multifd_send_fill_packet(MultiFDSendParams *p)
-{
-    MultiFDPacket_t *packet = p->packet;
-    int i;
-
-    packet->flags = cpu_to_be32(p->flags);
-    packet->pages_alloc = cpu_to_be32(p->pages->allocated);
-    packet->normal_pages = cpu_to_be32(p->normal_num);
-    packet->next_packet_size = cpu_to_be32(p->next_packet_size);
-    packet->packet_num = cpu_to_be64(p->packet_num);
-
-    if (p->pages->block) {
-        strncpy(packet->ramblock, p->pages->block->idstr, 256);
-    }
-
-    for (i = 0; i < p->normal_num; i++) {
-        /* there are architectures where ram_addr_t is 32 bit */
-        uint64_t temp = p->normal[i];
-
-        packet->offset[i] = cpu_to_be64(temp);
-    }
-}
-
-static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp)
-{
-    MultiFDPacket_t *packet = p->packet;
-    RAMBlock *block;
-    int i;
-
-    packet->magic = be32_to_cpu(packet->magic);
-    if (packet->magic != MULTIFD_MAGIC) {
-        error_setg(errp, "multifd: received packet "
-                   "magic %x and expected magic %x",
-                   packet->magic, MULTIFD_MAGIC);
-        return -1;
-    }
-
-    packet->version = be32_to_cpu(packet->version);
-    if (packet->version != MULTIFD_VERSION) {
-        error_setg(errp, "multifd: received packet "
-                   "version %u and expected version %u",
-                   packet->version, MULTIFD_VERSION);
-        return -1;
-    }
-
-    p->flags = be32_to_cpu(packet->flags);
-
-    packet->pages_alloc = be32_to_cpu(packet->pages_alloc);
-    /*
-     * If we received a packet that is 100 times bigger than expected
-     * just stop migration.  It is a magic number.
-     */
-    if (packet->pages_alloc > p->page_count) {
-        error_setg(errp, "multifd: received packet "
-                   "with size %u and expected a size of %u",
-                   packet->pages_alloc, p->page_count) ;
-        return -1;
-    }
-
-    p->normal_num = be32_to_cpu(packet->normal_pages);
-    if (p->normal_num > packet->pages_alloc) {
-        error_setg(errp, "multifd: received packet "
-                   "with %u pages and expected maximum pages are %u",
-                   p->normal_num, packet->pages_alloc) ;
-        return -1;
-    }
-
-    p->next_packet_size = be32_to_cpu(packet->next_packet_size);
-    p->packet_num = be64_to_cpu(packet->packet_num);
-
-    if (p->normal_num == 0) {
-        return 0;
-    }
-
-    /* make sure that ramblock is 0 terminated */
-    packet->ramblock[255] = 0;
-    block = qemu_ram_block_by_name(packet->ramblock);
-    if (!block) {
-        error_setg(errp, "multifd: unknown ram block %s",
-                   packet->ramblock);
-        return -1;
-    }
-
-    p->host = block->host;
-    for (i = 0; i < p->normal_num; i++) {
-        uint64_t offset = be64_to_cpu(packet->offset[i]);
-
-        if (offset > (block->used_length - p->page_size)) {
-            error_setg(errp, "multifd: offset too long %" PRIu64
-                       " (max " RAM_ADDR_FMT ")",
-                       offset, block->used_length);
-            return -1;
-        }
-        p->normal[i] = offset;
-    }
-
-    return 0;
-}
-
-struct {
-    MultiFDSendParams *params;
-    /* array of pages to sent */
-    MultiFDPages_t *pages;
-    /* global number of generated multifd packets */
-    uint64_t packet_num;
-    /* send channels ready */
-    QemuSemaphore channels_ready;
-    /*
-     * Have we already run terminate threads.  There is a race when it
-     * happens that we got one error while we are exiting.
-     * We will use atomic operations.  Only valid values are 0 and 1.
-     */
-    int exiting;
-    /* multifd ops */
-    MultiFDMethods *ops;
-} *multifd_send_state;
-
-/*
- * How we use multifd_send_state->pages and channel->pages?
- *
- * We create a pages for each channel, and a main one.  Each time that
- * we need to send a batch of pages we interchange the ones between
- * multifd_send_state and the channel that is sending it.  There are
- * two reasons for that:
- *    - to not have to do so many mallocs during migration
- *    - to make easier to know what to free at the end of migration
- *
- * This way we always know who is the owner of each "pages" struct,
- * and we don't need any locking.  It belongs to the migration thread
- * or to the channel thread.  Switching is safe because the migration
- * thread is using the channel mutex when changing it, and the channel
- * have to had finish with its own, otherwise pending_job can't be
- * false.
- */
-
-static int multifd_send_pages(QEMUFile *f)
-{
-    int i;
-    static int next_channel;
-    MultiFDSendParams *p = NULL; /* make happy gcc */
-    MultiFDPages_t *pages = multifd_send_state->pages;
-    uint64_t transferred;
-
-    if (qatomic_read(&multifd_send_state->exiting)) {
-        return -1;
-    }
-
-    qemu_sem_wait(&multifd_send_state->channels_ready);
-    /*
-     * next_channel can remain from a previous migration that was
-     * using more channels, so ensure it doesn't overflow if the
-     * limit is lower now.
-     */
-    next_channel %= migrate_multifd_channels();
-    for (i = next_channel;; i = (i + 1) % migrate_multifd_channels()) {
-        p = &multifd_send_state->params[i];
-
-        qemu_mutex_lock(&p->mutex);
-        if (p->quit) {
-            error_report("%s: channel %d has already quit!", __func__, i);
-            qemu_mutex_unlock(&p->mutex);
-            return -1;
-        }
-        if (!p->pending_job) {
-            p->pending_job++;
-            next_channel = (i + 1) % migrate_multifd_channels();
-            break;
-        }
-        qemu_mutex_unlock(&p->mutex);
-    }
-    assert(!p->pages->num);
-    assert(!p->pages->block);
-
-    p->packet_num = multifd_send_state->packet_num++;
-    multifd_send_state->pages = p->pages;
-    p->pages = pages;
-    transferred = ((uint64_t) pages->num) * p->page_size + p->packet_len;
-    qemu_file_acct_rate_limit(f, transferred);
-    ram_counters.multifd_bytes += transferred;
-    stat64_add(&ram_atomic_counters.transferred, transferred);
-    qemu_mutex_unlock(&p->mutex);
-    qemu_sem_post(&p->sem);
-
-    return 1;
-}
-
-int multifd_queue_page(QEMUFile *f, RAMBlock *block, ram_addr_t offset)
-{
-    MultiFDPages_t *pages = multifd_send_state->pages;
-    bool changed = false;
-
-    if (!pages->block) {
-        pages->block = block;
-    }
-
-    if (pages->block == block) {
-        pages->offset[pages->num] = offset;
-        pages->num++;
-
-        if (pages->num < pages->allocated) {
-            return 1;
-        }
-    } else {
-        changed = true;
-    }
-
-    if (multifd_send_pages(f) < 0) {
-        return -1;
-    }
-
-    if (changed) {
-        return multifd_queue_page(f, block, offset);
-    }
-
-    return 1;
-}
-
-static void multifd_send_terminate_threads(Error *err)
-{
-    int i;
-
-    trace_multifd_send_terminate_threads(err != NULL);
-
-    if (err) {
-        MigrationState *s = migrate_get_current();
-        migrate_set_error(s, err);
-        if (s->state == MIGRATION_STATUS_SETUP ||
-            s->state == MIGRATION_STATUS_PRE_SWITCHOVER ||
-            s->state == MIGRATION_STATUS_DEVICE ||
-            s->state == MIGRATION_STATUS_ACTIVE) {
-            migrate_set_state(&s->state, s->state,
-                              MIGRATION_STATUS_FAILED);
-        }
-    }
-
-    /*
-     * We don't want to exit each threads twice.  Depending on where
-     * we get the error, or if there are two independent errors in two
-     * threads at the same time, we can end calling this function
-     * twice.
-     */
-    if (qatomic_xchg(&multifd_send_state->exiting, 1)) {
-        return;
-    }
-
-    for (i = 0; i < migrate_multifd_channels(); i++) {
-        MultiFDSendParams *p = &multifd_send_state->params[i];
-
-        qemu_mutex_lock(&p->mutex);
-        p->quit = true;
-        qemu_sem_post(&p->sem);
-        if (p->c) {
-            qio_channel_shutdown(p->c, QIO_CHANNEL_SHUTDOWN_BOTH, NULL);
-        }
-        qemu_mutex_unlock(&p->mutex);
-    }
-}
-
-void multifd_save_cleanup(void)
-{
-    int i;
-
-    if (!migrate_use_multifd() || !migrate_multi_channels_is_allowed()) {
-        return;
-    }
-    multifd_send_terminate_threads(NULL);
-    for (i = 0; i < migrate_multifd_channels(); i++) {
-        MultiFDSendParams *p = &multifd_send_state->params[i];
-
-        if (p->running) {
-            qemu_thread_join(&p->thread);
-        }
-    }
-    for (i = 0; i < migrate_multifd_channels(); i++) {
-        MultiFDSendParams *p = &multifd_send_state->params[i];
-        Error *local_err = NULL;
-
-        if (p->registered_yank) {
-            migration_ioc_unregister_yank(p->c);
-        }
-        socket_send_channel_destroy(p->c);
-        p->c = NULL;
-        qemu_mutex_destroy(&p->mutex);
-        qemu_sem_destroy(&p->sem);
-        qemu_sem_destroy(&p->sem_sync);
-        g_free(p->name);
-        p->name = NULL;
-        multifd_pages_clear(p->pages);
-        p->pages = NULL;
-        p->packet_len = 0;
-        g_free(p->packet);
-        p->packet = NULL;
-        g_free(p->iov);
-        p->iov = NULL;
-        g_free(p->normal);
-        p->normal = NULL;
-        multifd_send_state->ops->send_cleanup(p, &local_err);
-        if (local_err) {
-            migrate_set_error(migrate_get_current(), local_err);
-            error_free(local_err);
-        }
-    }
-    qemu_sem_destroy(&multifd_send_state->channels_ready);
-    g_free(multifd_send_state->params);
-    multifd_send_state->params = NULL;
-    multifd_pages_clear(multifd_send_state->pages);
-    multifd_send_state->pages = NULL;
-    g_free(multifd_send_state);
-    multifd_send_state = NULL;
-}
-
-static int multifd_zero_copy_flush(QIOChannel *c)
-{
-    int ret;
-    Error *err = NULL;
-
-    ret = qio_channel_flush(c, &err);
-    if (ret < 0) {
-        error_report_err(err);
-        return -1;
-    }
-    if (ret == 1) {
-        dirty_sync_missed_zero_copy();
-    }
-
-    return ret;
-}
-
-int multifd_send_sync_main(QEMUFile *f)
-{
-    int i;
-    bool flush_zero_copy;
-
-    if (!migrate_use_multifd()) {
-        return 0;
-    }
-    if (multifd_send_state->pages->num) {
-        if (multifd_send_pages(f) < 0) {
-            error_report("%s: multifd_send_pages fail", __func__);
-            return -1;
-        }
-    }
-
-    /*
-     * When using zero-copy, it's necessary to flush the pages before any of
-     * the pages can be sent again, so we'll make sure the new version of the
-     * pages will always arrive _later_ than the old pages.
-     *
-     * Currently we achieve this by flushing the zero-page requested writes
-     * per ram iteration, but in the future we could potentially optimize it
-     * to be less frequent, e.g. only after we finished one whole scanning of
-     * all the dirty bitmaps.
-     */
-
-    flush_zero_copy = migrate_use_zero_copy_send();
-
-    for (i = 0; i < migrate_multifd_channels(); i++) {
-        MultiFDSendParams *p = &multifd_send_state->params[i];
-
-        trace_multifd_send_sync_main_signal(p->id);
-
-        qemu_mutex_lock(&p->mutex);
-
-        if (p->quit) {
-            error_report("%s: channel %d has already quit", __func__, i);
-            qemu_mutex_unlock(&p->mutex);
-            return -1;
-        }
-
-        p->packet_num = multifd_send_state->packet_num++;
-        p->flags |= MULTIFD_FLAG_SYNC;
-        p->pending_job++;
-        qemu_file_acct_rate_limit(f, p->packet_len);
-        ram_counters.multifd_bytes += p->packet_len;
-        stat64_add(&ram_atomic_counters.transferred, p->packet_len);
-        qemu_mutex_unlock(&p->mutex);
-        qemu_sem_post(&p->sem);
-
-        if (flush_zero_copy && p->c && (multifd_zero_copy_flush(p->c) < 0)) {
-            return -1;
-        }
-    }
-    for (i = 0; i < migrate_multifd_channels(); i++) {
-        MultiFDSendParams *p = &multifd_send_state->params[i];
-
-        trace_multifd_send_sync_main_wait(p->id);
-        qemu_sem_wait(&p->sem_sync);
-    }
-    trace_multifd_send_sync_main(multifd_send_state->packet_num);
-
-    return 0;
-}
-
-static void *multifd_send_thread(void *opaque)
-{
-    MultiFDSendParams *p = opaque;
-    Error *local_err = NULL;
-    int ret = 0;
-    bool use_zero_copy_send = migrate_use_zero_copy_send();
-
-    trace_multifd_send_thread_start(p->id);
-    rcu_register_thread();
-
-    if (multifd_send_initial_packet(p, &local_err) < 0) {
-        ret = -1;
-        goto out;
-    }
-    /* initial packet */
-    p->num_packets = 1;
-
-    while (true) {
-        qemu_sem_wait(&p->sem);
-
-        if (qatomic_read(&multifd_send_state->exiting)) {
-            break;
-        }
-        qemu_mutex_lock(&p->mutex);
-
-        if (p->pending_job) {
-            uint64_t packet_num = p->packet_num;
-            uint32_t flags = p->flags;
-            p->normal_num = 0;
-
-            if (use_zero_copy_send) {
-                p->iovs_num = 0;
-            } else {
-                p->iovs_num = 1;
-            }
-
-            for (int i = 0; i < p->pages->num; i++) {
-                p->normal[p->normal_num] = p->pages->offset[i];
-                p->normal_num++;
-            }
-
-            if (p->normal_num) {
-                ret = multifd_send_state->ops->send_prepare(p, &local_err);
-                if (ret != 0) {
-                    qemu_mutex_unlock(&p->mutex);
-                    break;
-                }
-            }
-            multifd_send_fill_packet(p);
-            p->flags = 0;
-            p->num_packets++;
-            p->total_normal_pages += p->normal_num;
-            p->pages->num = 0;
-            p->pages->block = NULL;
-            qemu_mutex_unlock(&p->mutex);
-
-            trace_multifd_send(p->id, packet_num, p->normal_num, flags,
-                               p->next_packet_size);
-
-            if (use_zero_copy_send) {
-                /* Send header first, without zerocopy */
-                ret = qio_channel_write_all(p->c, (void *)p->packet,
-                                            p->packet_len, &local_err);
-                if (ret != 0) {
-                    break;
-                }
-            } else {
-                /* Send header using the same writev call */
-                p->iov[0].iov_len = p->packet_len;
-                p->iov[0].iov_base = p->packet;
-            }
-
-            ret = qio_channel_writev_full_all(p->c, p->iov, p->iovs_num, NULL,
-                                              0, p->write_flags, &local_err);
-            if (ret != 0) {
-                break;
-            }
-
-            qemu_mutex_lock(&p->mutex);
-            p->pending_job--;
-            qemu_mutex_unlock(&p->mutex);
-
-            if (flags & MULTIFD_FLAG_SYNC) {
-                qemu_sem_post(&p->sem_sync);
-            }
-            qemu_sem_post(&multifd_send_state->channels_ready);
-        } else if (p->quit) {
-            qemu_mutex_unlock(&p->mutex);
-            break;
-        } else {
-            qemu_mutex_unlock(&p->mutex);
-            /* sometimes there are spurious wakeups */
-        }
-    }
-
-out:
-    if (local_err) {
-        trace_multifd_send_error(p->id);
-        multifd_send_terminate_threads(local_err);
-        error_free(local_err);
-    }
-
-    /*
-     * Error happen, I will exit, but I can't just leave, tell
-     * who pay attention to me.
-     */
-    if (ret != 0) {
-        qemu_sem_post(&p->sem_sync);
-        qemu_sem_post(&multifd_send_state->channels_ready);
-    }
-
-    qemu_mutex_lock(&p->mutex);
-    p->running = false;
-    qemu_mutex_unlock(&p->mutex);
-
-    rcu_unregister_thread();
-    trace_multifd_send_thread_end(p->id, p->num_packets, p->total_normal_pages);
-
-    return NULL;
-}
-
-static bool multifd_channel_connect(MultiFDSendParams *p,
-                                    QIOChannel *ioc,
-                                    Error *error);
-
-static void multifd_tls_outgoing_handshake(QIOTask *task,
-                                           gpointer opaque)
-{
-    MultiFDSendParams *p = opaque;
-    QIOChannel *ioc = QIO_CHANNEL(qio_task_get_source(task));
-    Error *err = NULL;
-
-    if (qio_task_propagate_error(task, &err)) {
-        trace_multifd_tls_outgoing_handshake_error(ioc, error_get_pretty(err));
-    } else {
-        trace_multifd_tls_outgoing_handshake_complete(ioc);
-    }
-
-    if (!multifd_channel_connect(p, ioc, err)) {
-        /*
-         * Error happen, mark multifd_send_thread status as 'quit' although it
-         * is not created, and then tell who pay attention to me.
-         */
-        p->quit = true;
-        qemu_sem_post(&multifd_send_state->channels_ready);
-        qemu_sem_post(&p->sem_sync);
-    }
-}
-
-static void *multifd_tls_handshake_thread(void *opaque)
-{
-    MultiFDSendParams *p = opaque;
-    QIOChannelTLS *tioc = QIO_CHANNEL_TLS(p->c);
-
-    qio_channel_tls_handshake(tioc,
-                              multifd_tls_outgoing_handshake,
-                              p,
-                              NULL,
-                              NULL);
-    return NULL;
-}
-
-static void multifd_tls_channel_connect(MultiFDSendParams *p,
-                                        QIOChannel *ioc,
-                                        Error **errp)
-{
-    MigrationState *s = migrate_get_current();
-    const char *hostname = s->hostname;
-    QIOChannelTLS *tioc;
-
-    tioc = migration_tls_client_create(s, ioc, hostname, errp);
-    if (!tioc) {
-        return;
-    }
-
-    object_unref(OBJECT(ioc));
-    trace_multifd_tls_outgoing_handshake_start(ioc, tioc, hostname);
-    qio_channel_set_name(QIO_CHANNEL(tioc), "multifd-tls-outgoing");
-    p->c = QIO_CHANNEL(tioc);
-    qemu_thread_create(&p->thread, "multifd-tls-handshake-worker",
-                       multifd_tls_handshake_thread, p,
-                       QEMU_THREAD_JOINABLE);
-}
-
-static bool multifd_channel_connect(MultiFDSendParams *p,
-                                    QIOChannel *ioc,
-                                    Error *error)
-{
-    trace_multifd_set_outgoing_channel(
-        ioc, object_get_typename(OBJECT(ioc)),
-        migrate_get_current()->hostname, error);
-
-    if (!error) {
-        if (migrate_channel_requires_tls_upgrade(ioc)) {
-            multifd_tls_channel_connect(p, ioc, &error);
-            if (!error) {
-                /*
-                 * tls_channel_connect will call back to this
-                 * function after the TLS handshake,
-                 * so we mustn't call multifd_send_thread until then
-                 */
-                return true;
-            } else {
-                return false;
-            }
-        } else {
-            migration_ioc_register_yank(ioc);
-            p->registered_yank = true;
-            p->c = ioc;
-            qemu_thread_create(&p->thread, p->name, multifd_send_thread, p,
-                                   QEMU_THREAD_JOINABLE);
-       }
-       return true;
-    }
-
-    return false;
-}
-
-static void multifd_new_send_channel_cleanup(MultiFDSendParams *p,
-                                             QIOChannel *ioc, Error *err)
-{
-     migrate_set_error(migrate_get_current(), err);
-     /* Error happen, we need to tell who pay attention to me */
-     qemu_sem_post(&multifd_send_state->channels_ready);
-     qemu_sem_post(&p->sem_sync);
-     /*
-      * Although multifd_send_thread is not created, but main migration
-      * thread neet to judge whether it is running, so we need to mark
-      * its status.
-      */
-     p->quit = true;
-     object_unref(OBJECT(ioc));
-     error_free(err);
-}
-
-static void multifd_new_send_channel_async(QIOTask *task, gpointer opaque)
-{
-    MultiFDSendParams *p = opaque;
-    QIOChannel *sioc = QIO_CHANNEL(qio_task_get_source(task));
-    Error *local_err = NULL;
-
-    trace_multifd_new_send_channel_async(p->id);
-    if (qio_task_propagate_error(task, &local_err)) {
-        goto cleanup;
-    } else {
-        p->c = QIO_CHANNEL(sioc);
-        qio_channel_set_delay(p->c, false);
-        p->running = true;
-        if (!multifd_channel_connect(p, sioc, local_err)) {
-            goto cleanup;
-        }
-        return;
-    }
-
-cleanup:
-    multifd_new_send_channel_cleanup(p, sioc, local_err);
-}
-
-int multifd_save_setup(Error **errp)
-{
-    int thread_count;
-    uint32_t page_count = MULTIFD_PACKET_SIZE / qemu_target_page_size();
-    uint8_t i;
-
-    if (!migrate_use_multifd()) {
-        return 0;
-    }
-    if (!migrate_multi_channels_is_allowed()) {
-        error_setg(errp, "multifd is not supported by current protocol");
-        return -1;
-    }
-
-    thread_count = migrate_multifd_channels();
-    multifd_send_state = g_malloc0(sizeof(*multifd_send_state));
-    multifd_send_state->params = g_new0(MultiFDSendParams, thread_count);
-    multifd_send_state->pages = multifd_pages_init(page_count);
-    qemu_sem_init(&multifd_send_state->channels_ready, 0);
-    qatomic_set(&multifd_send_state->exiting, 0);
-    multifd_send_state->ops = multifd_ops[migrate_multifd_compression()];
-
-    for (i = 0; i < thread_count; i++) {
-        MultiFDSendParams *p = &multifd_send_state->params[i];
-
-        qemu_mutex_init(&p->mutex);
-        qemu_sem_init(&p->sem, 0);
-        qemu_sem_init(&p->sem_sync, 0);
-        p->quit = false;
-        p->pending_job = 0;
-        p->id = i;
-        p->pages = multifd_pages_init(page_count);
-        p->packet_len = sizeof(MultiFDPacket_t)
-                      + sizeof(uint64_t) * page_count;
-        p->packet = g_malloc0(p->packet_len);
-        p->packet->magic = cpu_to_be32(MULTIFD_MAGIC);
-        p->packet->version = cpu_to_be32(MULTIFD_VERSION);
-        p->name = g_strdup_printf("multifdsend_%d", i);
-        /* We need one extra place for the packet header */
-        p->iov = g_new0(struct iovec, page_count + 1);
-        p->normal = g_new0(ram_addr_t, page_count);
-        p->page_size = qemu_target_page_size();
-        p->page_count = page_count;
-
-        if (migrate_use_zero_copy_send()) {
-            p->write_flags = QIO_CHANNEL_WRITE_FLAG_ZERO_COPY;
-        } else {
-            p->write_flags = 0;
-        }
-
-        socket_send_channel_create(multifd_new_send_channel_async, p);
-    }
-
-    for (i = 0; i < thread_count; i++) {
-        MultiFDSendParams *p = &multifd_send_state->params[i];
-        Error *local_err = NULL;
-        int ret;
-
-        ret = multifd_send_state->ops->send_setup(p, &local_err);
-        if (ret) {
-            error_propagate(errp, local_err);
-            return ret;
-        }
-    }
-    return 0;
-}
-
-struct {
-    MultiFDRecvParams *params;
-    /* number of created threads */
-    int count;
-    /* syncs main thread and channels */
-    QemuSemaphore sem_sync;
-    /* global number of generated multifd packets */
-    uint64_t packet_num;
-    /* multifd ops */
-    MultiFDMethods *ops;
-} *multifd_recv_state;
-
-static void multifd_recv_terminate_threads(Error *err)
-{
-    int i;
-
-    trace_multifd_recv_terminate_threads(err != NULL);
-
-    if (err) {
-        MigrationState *s = migrate_get_current();
-        migrate_set_error(s, err);
-        if (s->state == MIGRATION_STATUS_SETUP ||
-            s->state == MIGRATION_STATUS_ACTIVE) {
-            migrate_set_state(&s->state, s->state,
-                              MIGRATION_STATUS_FAILED);
-        }
-    }
-
-    for (i = 0; i < migrate_multifd_channels(); i++) {
-        MultiFDRecvParams *p = &multifd_recv_state->params[i];
-
-        qemu_mutex_lock(&p->mutex);
-        p->quit = true;
-        /*
-         * We could arrive here for two reasons:
-         *  - normal quit, i.e. everything went fine, just finished
-         *  - error quit: We close the channels so the channel threads
-         *    finish the qio_channel_read_all_eof()
-         */
-        if (p->c) {
-            qio_channel_shutdown(p->c, QIO_CHANNEL_SHUTDOWN_BOTH, NULL);
-        }
-        qemu_mutex_unlock(&p->mutex);
-    }
-}
-
-int multifd_load_cleanup(Error **errp)
-{
-    int i;
-
-    if (!migrate_use_multifd() || !migrate_multi_channels_is_allowed()) {
-        return 0;
-    }
-    multifd_recv_terminate_threads(NULL);
-    for (i = 0; i < migrate_multifd_channels(); i++) {
-        MultiFDRecvParams *p = &multifd_recv_state->params[i];
-
-        if (p->running) {
-            p->quit = true;
-            /*
-             * multifd_recv_thread may hung at MULTIFD_FLAG_SYNC handle code,
-             * however try to wakeup it without harm in cleanup phase.
-             */
-            qemu_sem_post(&p->sem_sync);
-            qemu_thread_join(&p->thread);
-        }
-    }
-    for (i = 0; i < migrate_multifd_channels(); i++) {
-        MultiFDRecvParams *p = &multifd_recv_state->params[i];
-
-        migration_ioc_unregister_yank(p->c);
-        object_unref(OBJECT(p->c));
-        p->c = NULL;
-        qemu_mutex_destroy(&p->mutex);
-        qemu_sem_destroy(&p->sem_sync);
-        g_free(p->name);
-        p->name = NULL;
-        p->packet_len = 0;
-        g_free(p->packet);
-        p->packet = NULL;
-        g_free(p->iov);
-        p->iov = NULL;
-        g_free(p->normal);
-        p->normal = NULL;
-        multifd_recv_state->ops->recv_cleanup(p);
-    }
-    qemu_sem_destroy(&multifd_recv_state->sem_sync);
-    g_free(multifd_recv_state->params);
-    multifd_recv_state->params = NULL;
-    g_free(multifd_recv_state);
-    multifd_recv_state = NULL;
-
-    return 0;
-}
-
-void multifd_recv_sync_main(void)
-{
-    int i;
-
-    if (!migrate_use_multifd()) {
-        return;
-    }
-    for (i = 0; i < migrate_multifd_channels(); i++) {
-        MultiFDRecvParams *p = &multifd_recv_state->params[i];
-
-        trace_multifd_recv_sync_main_wait(p->id);
-        qemu_sem_wait(&multifd_recv_state->sem_sync);
-    }
-    for (i = 0; i < migrate_multifd_channels(); i++) {
-        MultiFDRecvParams *p = &multifd_recv_state->params[i];
-
-        WITH_QEMU_LOCK_GUARD(&p->mutex) {
-            if (multifd_recv_state->packet_num < p->packet_num) {
-                multifd_recv_state->packet_num = p->packet_num;
-            }
-        }
-        trace_multifd_recv_sync_main_signal(p->id);
-        qemu_sem_post(&p->sem_sync);
-    }
-    trace_multifd_recv_sync_main(multifd_recv_state->packet_num);
-}
-
-static void *multifd_recv_thread(void *opaque)
-{
-    MultiFDRecvParams *p = opaque;
-    Error *local_err = NULL;
-    int ret;
-
-    trace_multifd_recv_thread_start(p->id);
-    rcu_register_thread();
-
-    while (true) {
-        uint32_t flags;
-
-        if (p->quit) {
-            break;
-        }
-
-        ret = qio_channel_read_all_eof(p->c, (void *)p->packet,
-                                       p->packet_len, &local_err);
-        if (ret == 0) {   /* EOF */
-            break;
-        }
-        if (ret == -1) {   /* Error */
-            break;
-        }
-
-        qemu_mutex_lock(&p->mutex);
-        ret = multifd_recv_unfill_packet(p, &local_err);
-        if (ret) {
-            qemu_mutex_unlock(&p->mutex);
-            break;
-        }
-
-        flags = p->flags;
-        /* recv methods don't know how to handle the SYNC flag */
-        p->flags &= ~MULTIFD_FLAG_SYNC;
-        trace_multifd_recv(p->id, p->packet_num, p->normal_num, flags,
-                           p->next_packet_size);
-        p->num_packets++;
-        p->total_normal_pages += p->normal_num;
-        qemu_mutex_unlock(&p->mutex);
-
-        if (p->normal_num) {
-            ret = multifd_recv_state->ops->recv_pages(p, &local_err);
-            if (ret != 0) {
-                break;
-            }
-        }
-
-        if (flags & MULTIFD_FLAG_SYNC) {
-            qemu_sem_post(&multifd_recv_state->sem_sync);
-            qemu_sem_wait(&p->sem_sync);
-        }
-    }
-
-    if (local_err) {
-        multifd_recv_terminate_threads(local_err);
-        error_free(local_err);
-    }
-    qemu_mutex_lock(&p->mutex);
-    p->running = false;
-    qemu_mutex_unlock(&p->mutex);
-
-    rcu_unregister_thread();
-    trace_multifd_recv_thread_end(p->id, p->num_packets, p->total_normal_pages);
-
-    return NULL;
-}
-
-int multifd_load_setup(Error **errp)
-{
-    int thread_count;
-    uint32_t page_count = MULTIFD_PACKET_SIZE / qemu_target_page_size();
-    uint8_t i;
-
-    /*
-     * Return successfully if multiFD recv state is already initialised
-     * or multiFD is not enabled.
-     */
-    if (multifd_recv_state || !migrate_use_multifd()) {
-        return 0;
-    }
-
-    if (!migrate_multi_channels_is_allowed()) {
-        error_setg(errp, "multifd is not supported by current protocol");
-        return -1;
-    }
-    thread_count = migrate_multifd_channels();
-    multifd_recv_state = g_malloc0(sizeof(*multifd_recv_state));
-    multifd_recv_state->params = g_new0(MultiFDRecvParams, thread_count);
-    qatomic_set(&multifd_recv_state->count, 0);
-    qemu_sem_init(&multifd_recv_state->sem_sync, 0);
-    multifd_recv_state->ops = multifd_ops[migrate_multifd_compression()];
-
-    for (i = 0; i < thread_count; i++) {
-        MultiFDRecvParams *p = &multifd_recv_state->params[i];
-
-        qemu_mutex_init(&p->mutex);
-        qemu_sem_init(&p->sem_sync, 0);
-        p->quit = false;
-        p->id = i;
-        p->packet_len = sizeof(MultiFDPacket_t)
-                      + sizeof(uint64_t) * page_count;
-        p->packet = g_malloc0(p->packet_len);
-        p->name = g_strdup_printf("multifdrecv_%d", i);
-        p->iov = g_new0(struct iovec, page_count);
-        p->normal = g_new0(ram_addr_t, page_count);
-        p->page_count = page_count;
-        p->page_size = qemu_target_page_size();
-    }
-
-    for (i = 0; i < thread_count; i++) {
-        MultiFDRecvParams *p = &multifd_recv_state->params[i];
-        Error *local_err = NULL;
-        int ret;
-
-        ret = multifd_recv_state->ops->recv_setup(p, &local_err);
-        if (ret) {
-            error_propagate(errp, local_err);
-            return ret;
-        }
-    }
-    return 0;
-}
-
-bool multifd_recv_all_channels_created(void)
-{
-    int thread_count = migrate_multifd_channels();
-
-    if (!migrate_use_multifd()) {
-        return true;
-    }
-
-    if (!multifd_recv_state) {
-        /* Called before any connections created */
-        return false;
-    }
-
-    return thread_count == qatomic_read(&multifd_recv_state->count);
-}
-
-/*
- * Try to receive all multifd channels to get ready for the migration.
- * Sets @errp when failing to receive the current channel.
- */
-void multifd_recv_new_channel(QIOChannel *ioc, Error **errp)
-{
-    MultiFDRecvParams *p;
-    Error *local_err = NULL;
-    int id;
-
-    id = multifd_recv_initial_packet(ioc, &local_err);
-    if (id < 0) {
-        multifd_recv_terminate_threads(local_err);
-        error_propagate_prepend(errp, local_err,
-                                "failed to receive packet"
-                                " via multifd channel %d: ",
-                                qatomic_read(&multifd_recv_state->count));
-        return;
-    }
-    trace_multifd_recv_new_channel(id);
-
-    p = &multifd_recv_state->params[id];
-    if (p->c != NULL) {
-        error_setg(&local_err, "multifd: received id '%d' already setup'",
-                   id);
-        multifd_recv_terminate_threads(local_err);
-        error_propagate(errp, local_err);
-        return;
-    }
-    p->c = ioc;
-    object_ref(OBJECT(ioc));
-    /* initial packet */
-    p->num_packets = 1;
-
-    p->running = true;
-    qemu_thread_create(&p->thread, p->name, multifd_recv_thread, p,
-                       QEMU_THREAD_JOINABLE);
-    qatomic_inc(&multifd_recv_state->count);
-}