| /* |
| * 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 "qemu-file.h" |
| #include "trace.h" |
| #include "multifd.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 |
| */ |
| 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 |
| * @used: number of pages used |
| * @errp: pointer to an error |
| */ |
| static int nocomp_send_prepare(MultiFDSendParams *p, uint32_t used, |
| Error **errp) |
| { |
| p->next_packet_size = used * qemu_target_page_size(); |
| p->flags |= MULTIFD_FLAG_NOCOMP; |
| return 0; |
| } |
| |
| /** |
| * nocomp_send_write: do the actual write of the data |
| * |
| * For no compression we just have to write the data. |
| * |
| * Returns 0 for success or -1 for error |
| * |
| * @p: Params for the channel that we are using |
| * @used: number of pages used |
| * @errp: pointer to an error |
| */ |
| static int nocomp_send_write(MultiFDSendParams *p, uint32_t used, Error **errp) |
| { |
| return qio_channel_writev_all(p->c, p->pages->iov, used, errp); |
| } |
| |
| /** |
| * 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 |
| * @used: number of pages used |
| * @errp: pointer to an error |
| */ |
| static int nocomp_recv_pages(MultiFDRecvParams *p, uint32_t used, Error **errp) |
| { |
| uint32_t flags = p->flags & MULTIFD_FLAG_COMPRESSION_MASK; |
| |
| if (flags != MULTIFD_FLAG_NOCOMP) { |
| error_setg(errp, "multifd %d: flags received %x flags expected %x", |
| p->id, flags, MULTIFD_FLAG_NOCOMP); |
| return -1; |
| } |
| return qio_channel_readv_all(p->c, p->pages->iov, used, errp); |
| } |
| |
| static MultiFDMethods multifd_nocomp_ops = { |
| .send_setup = nocomp_send_setup, |
| .send_cleanup = nocomp_send_cleanup, |
| .send_prepare = nocomp_send_prepare, |
| .send_write = nocomp_send_write, |
| .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 %d " |
| "expected %d", 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 %d " |
| "expected %d", 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->iov = g_new0(struct iovec, size); |
| pages->offset = g_new0(ram_addr_t, size); |
| |
| return pages; |
| } |
| |
| static void multifd_pages_clear(MultiFDPages_t *pages) |
| { |
| pages->used = 0; |
| pages->allocated = 0; |
| pages->packet_num = 0; |
| pages->block = NULL; |
| g_free(pages->iov); |
| pages->iov = 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->pages_used = cpu_to_be32(p->pages->used); |
| 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->pages->used; i++) { |
| /* there are architectures where ram_addr_t is 32 bit */ |
| uint64_t temp = p->pages->offset[i]; |
| |
| packet->offset[i] = cpu_to_be64(temp); |
| } |
| } |
| |
| static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp) |
| { |
| MultiFDPacket_t *packet = p->packet; |
| uint32_t pages_max = MULTIFD_PACKET_SIZE / qemu_target_page_size(); |
| 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 %d and expected version %d", |
| 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 > pages_max * 100) { |
| error_setg(errp, "multifd: received packet " |
| "with size %d and expected a maximum size of %d", |
| packet->pages_alloc, pages_max * 100) ; |
| return -1; |
| } |
| /* |
| * We received a packet that is bigger than expected but inside |
| * reasonable limits (see previous comment). Just reallocate. |
| */ |
| if (packet->pages_alloc > p->pages->allocated) { |
| multifd_pages_clear(p->pages); |
| p->pages = multifd_pages_init(packet->pages_alloc); |
| } |
| |
| p->pages->used = be32_to_cpu(packet->pages_used); |
| if (p->pages->used > packet->pages_alloc) { |
| error_setg(errp, "multifd: received packet " |
| "with %d pages and expected maximum pages are %d", |
| p->pages->used, 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->pages->used == 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; |
| } |
| |
| for (i = 0; i < p->pages->used; i++) { |
| uint64_t offset = be64_to_cpu(packet->offset[i]); |
| |
| if (offset > (block->used_length - qemu_target_page_size())) { |
| error_setg(errp, "multifd: offset too long %" PRIu64 |
| " (max " RAM_ADDR_FMT ")", |
| offset, block->max_length); |
| return -1; |
| } |
| p->pages->iov[i].iov_base = block->host + offset; |
| p->pages->iov[i].iov_len = qemu_target_page_size(); |
| } |
| |
| 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 (atomic_read(&multifd_send_state->exiting)) { |
| return -1; |
| } |
| |
| qemu_sem_wait(&multifd_send_state->channels_ready); |
| 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->used); |
| 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->used) * qemu_target_page_size() |
| + p->packet_len; |
| qemu_file_update_transfer(f, transferred); |
| ram_counters.multifd_bytes += transferred; |
| ram_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; |
| |
| if (!pages->block) { |
| pages->block = block; |
| } |
| |
| if (pages->block == block) { |
| pages->offset[pages->used] = offset; |
| pages->iov[pages->used].iov_base = block->host + offset; |
| pages->iov[pages->used].iov_len = qemu_target_page_size(); |
| pages->used++; |
| |
| if (pages->used < pages->allocated) { |
| return 1; |
| } |
| } |
| |
| if (multifd_send_pages(f) < 0) { |
| return -1; |
| } |
| |
| if (pages->block != block) { |
| 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 (atomic_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); |
| qemu_mutex_unlock(&p->mutex); |
| } |
| } |
| |
| void multifd_save_cleanup(void) |
| { |
| int i; |
| |
| if (!migrate_use_multifd()) { |
| 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; |
| |
| 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; |
| multifd_send_state->ops->send_cleanup(p, &local_err); |
| if (local_err) { |
| migrate_set_error(migrate_get_current(), 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; |
| } |
| |
| void multifd_send_sync_main(QEMUFile *f) |
| { |
| int i; |
| |
| if (!migrate_use_multifd()) { |
| return; |
| } |
| if (multifd_send_state->pages->used) { |
| if (multifd_send_pages(f) < 0) { |
| error_report("%s: multifd_send_pages fail", __func__); |
| return; |
| } |
| } |
| 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; |
| } |
| |
| p->packet_num = multifd_send_state->packet_num++; |
| p->flags |= MULTIFD_FLAG_SYNC; |
| p->pending_job++; |
| qemu_file_update_transfer(f, p->packet_len); |
| ram_counters.multifd_bytes += p->packet_len; |
| ram_counters.transferred += p->packet_len; |
| qemu_mutex_unlock(&p->mutex); |
| qemu_sem_post(&p->sem); |
| } |
| 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); |
| } |
| |
| static void *multifd_send_thread(void *opaque) |
| { |
| MultiFDSendParams *p = opaque; |
| Error *local_err = NULL; |
| int ret = 0; |
| uint32_t flags = 0; |
| |
| 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 (atomic_read(&multifd_send_state->exiting)) { |
| break; |
| } |
| qemu_mutex_lock(&p->mutex); |
| |
| if (p->pending_job) { |
| uint32_t used = p->pages->used; |
| uint64_t packet_num = p->packet_num; |
| flags = p->flags; |
| |
| if (used) { |
| ret = multifd_send_state->ops->send_prepare(p, used, |
| &local_err); |
| if (ret != 0) { |
| qemu_mutex_unlock(&p->mutex); |
| break; |
| } |
| } |
| multifd_send_fill_packet(p); |
| p->flags = 0; |
| p->num_packets++; |
| p->num_pages += used; |
| p->pages->used = 0; |
| p->pages->block = NULL; |
| qemu_mutex_unlock(&p->mutex); |
| |
| trace_multifd_send(p->id, packet_num, used, flags, |
| p->next_packet_size); |
| |
| ret = qio_channel_write_all(p->c, (void *)p->packet, |
| p->packet_len, &local_err); |
| if (ret != 0) { |
| break; |
| } |
| |
| if (used) { |
| ret = multifd_send_state->ops->send_write(p, used, &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 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->num_pages); |
| |
| return NULL; |
| } |
| |
| 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)) { |
| migrate_set_error(migrate_get_current(), local_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; |
| } else { |
| p->c = QIO_CHANNEL(sioc); |
| qio_channel_set_delay(p->c, false); |
| p->running = true; |
| qemu_thread_create(&p->thread, p->name, multifd_send_thread, p, |
| QEMU_THREAD_JOINABLE); |
| } |
| } |
| |
| 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; |
| } |
| 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); |
| atomic_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); |
| 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()) { |
| 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]; |
| |
| 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; |
| multifd_pages_clear(p->pages); |
| p->pages = NULL; |
| p->packet_len = 0; |
| g_free(p->packet); |
| p->packet = 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]; |
| |
| qemu_mutex_lock(&p->mutex); |
| if (multifd_recv_state->packet_num < p->packet_num) { |
| multifd_recv_state->packet_num = p->packet_num; |
| } |
| qemu_mutex_unlock(&p->mutex); |
| 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 used; |
| 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; |
| } |
| |
| used = p->pages->used; |
| 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, used, flags, |
| p->next_packet_size); |
| p->num_packets++; |
| p->num_pages += used; |
| qemu_mutex_unlock(&p->mutex); |
| |
| if (used) { |
| ret = multifd_recv_state->ops->recv_pages(p, used, &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); |
| } |
| 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->num_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; |
| |
| if (!migrate_use_multifd()) { |
| return 0; |
| } |
| thread_count = migrate_multifd_channels(); |
| multifd_recv_state = g_malloc0(sizeof(*multifd_recv_state)); |
| multifd_recv_state->params = g_new0(MultiFDRecvParams, thread_count); |
| atomic_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->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->name = g_strdup_printf("multifdrecv_%d", i); |
| } |
| |
| 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; |
| } |
| |
| return thread_count == atomic_read(&multifd_recv_state->count); |
| } |
| |
| /* |
| * Try to receive all multifd channels to get ready for the migration. |
| * - Return true and do not set @errp when correctly receving all channels; |
| * - Return false and do not set @errp when correctly receiving the current one; |
| * - Return false and set @errp when failing to receive the current channel. |
| */ |
| bool 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: ", |
| atomic_read(&multifd_recv_state->count)); |
| return false; |
| } |
| 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 false; |
| } |
| 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); |
| atomic_inc(&multifd_recv_state->count); |
| return atomic_read(&multifd_recv_state->count) == |
| migrate_multifd_channels(); |
| } |
