Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
900 lines
26 KiB
C
900 lines
26 KiB
C
/*
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* Multifd common code
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*
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* Copyright (c) 2019-2020 Red Hat Inc
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*
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* Authors:
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* Juan Quintela <quintela@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* 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/rcu.h"
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#include "exec/target_page.h"
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#include "sysemu/sysemu.h"
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#include "exec/ramblock.h"
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#include "qemu/error-report.h"
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#include "qapi/error.h"
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#include "ram.h"
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#include "migration.h"
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#include "socket.h"
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#include "qemu-file.h"
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#include "trace.h"
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#include "multifd.h"
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/* Multiple fd's */
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#define MULTIFD_MAGIC 0x11223344U
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#define MULTIFD_VERSION 1
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typedef struct {
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uint32_t magic;
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uint32_t version;
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unsigned char uuid[16]; /* QemuUUID */
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uint8_t id;
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uint8_t unused1[7]; /* Reserved for future use */
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uint64_t unused2[4]; /* Reserved for future use */
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} __attribute__((packed)) MultiFDInit_t;
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static int multifd_send_initial_packet(MultiFDSendParams *p, Error **errp)
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{
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MultiFDInit_t msg = {};
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int ret;
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msg.magic = cpu_to_be32(MULTIFD_MAGIC);
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msg.version = cpu_to_be32(MULTIFD_VERSION);
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msg.id = p->id;
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memcpy(msg.uuid, &qemu_uuid.data, sizeof(msg.uuid));
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ret = qio_channel_write_all(p->c, (char *)&msg, sizeof(msg), errp);
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if (ret != 0) {
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return -1;
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}
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return 0;
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}
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static int multifd_recv_initial_packet(QIOChannel *c, Error **errp)
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{
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MultiFDInit_t msg;
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int ret;
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ret = qio_channel_read_all(c, (char *)&msg, sizeof(msg), errp);
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if (ret != 0) {
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return -1;
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}
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msg.magic = be32_to_cpu(msg.magic);
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msg.version = be32_to_cpu(msg.version);
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if (msg.magic != MULTIFD_MAGIC) {
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error_setg(errp, "multifd: received packet magic %x "
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"expected %x", msg.magic, MULTIFD_MAGIC);
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return -1;
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}
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if (msg.version != MULTIFD_VERSION) {
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error_setg(errp, "multifd: received packet version %d "
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"expected %d", msg.version, MULTIFD_VERSION);
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return -1;
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}
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if (memcmp(msg.uuid, &qemu_uuid, sizeof(qemu_uuid))) {
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char *uuid = qemu_uuid_unparse_strdup(&qemu_uuid);
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char *msg_uuid = qemu_uuid_unparse_strdup((const QemuUUID *)msg.uuid);
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error_setg(errp, "multifd: received uuid '%s' and expected "
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"uuid '%s' for channel %hhd", msg_uuid, uuid, msg.id);
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g_free(uuid);
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g_free(msg_uuid);
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return -1;
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}
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if (msg.id > migrate_multifd_channels()) {
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error_setg(errp, "multifd: received channel version %d "
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"expected %d", msg.version, MULTIFD_VERSION);
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return -1;
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}
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return msg.id;
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}
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static MultiFDPages_t *multifd_pages_init(size_t size)
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{
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MultiFDPages_t *pages = g_new0(MultiFDPages_t, 1);
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pages->allocated = size;
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pages->iov = g_new0(struct iovec, size);
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pages->offset = g_new0(ram_addr_t, size);
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return pages;
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}
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static void multifd_pages_clear(MultiFDPages_t *pages)
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{
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pages->used = 0;
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pages->allocated = 0;
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pages->packet_num = 0;
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pages->block = NULL;
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g_free(pages->iov);
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pages->iov = NULL;
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g_free(pages->offset);
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pages->offset = NULL;
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g_free(pages);
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}
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static void multifd_send_fill_packet(MultiFDSendParams *p)
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{
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MultiFDPacket_t *packet = p->packet;
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int i;
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packet->flags = cpu_to_be32(p->flags);
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packet->pages_alloc = cpu_to_be32(p->pages->allocated);
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packet->pages_used = cpu_to_be32(p->pages->used);
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packet->next_packet_size = cpu_to_be32(p->next_packet_size);
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packet->packet_num = cpu_to_be64(p->packet_num);
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if (p->pages->block) {
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strncpy(packet->ramblock, p->pages->block->idstr, 256);
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}
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for (i = 0; i < p->pages->used; i++) {
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/* there are architectures where ram_addr_t is 32 bit */
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uint64_t temp = p->pages->offset[i];
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packet->offset[i] = cpu_to_be64(temp);
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}
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}
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static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp)
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{
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MultiFDPacket_t *packet = p->packet;
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uint32_t pages_max = MULTIFD_PACKET_SIZE / qemu_target_page_size();
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RAMBlock *block;
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int i;
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packet->magic = be32_to_cpu(packet->magic);
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if (packet->magic != MULTIFD_MAGIC) {
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error_setg(errp, "multifd: received packet "
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"magic %x and expected magic %x",
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packet->magic, MULTIFD_MAGIC);
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return -1;
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}
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packet->version = be32_to_cpu(packet->version);
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if (packet->version != MULTIFD_VERSION) {
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error_setg(errp, "multifd: received packet "
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"version %d and expected version %d",
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packet->version, MULTIFD_VERSION);
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return -1;
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}
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p->flags = be32_to_cpu(packet->flags);
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packet->pages_alloc = be32_to_cpu(packet->pages_alloc);
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/*
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* If we received a packet that is 100 times bigger than expected
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* just stop migration. It is a magic number.
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*/
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if (packet->pages_alloc > pages_max * 100) {
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error_setg(errp, "multifd: received packet "
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"with size %d and expected a maximum size of %d",
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packet->pages_alloc, pages_max * 100) ;
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return -1;
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}
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/*
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* We received a packet that is bigger than expected but inside
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* reasonable limits (see previous comment). Just reallocate.
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*/
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if (packet->pages_alloc > p->pages->allocated) {
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multifd_pages_clear(p->pages);
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p->pages = multifd_pages_init(packet->pages_alloc);
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}
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p->pages->used = be32_to_cpu(packet->pages_used);
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if (p->pages->used > packet->pages_alloc) {
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error_setg(errp, "multifd: received packet "
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"with %d pages and expected maximum pages are %d",
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p->pages->used, packet->pages_alloc) ;
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return -1;
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}
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p->next_packet_size = be32_to_cpu(packet->next_packet_size);
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p->packet_num = be64_to_cpu(packet->packet_num);
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if (p->pages->used == 0) {
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return 0;
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}
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/* make sure that ramblock is 0 terminated */
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packet->ramblock[255] = 0;
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block = qemu_ram_block_by_name(packet->ramblock);
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if (!block) {
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error_setg(errp, "multifd: unknown ram block %s",
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packet->ramblock);
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return -1;
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}
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for (i = 0; i < p->pages->used; i++) {
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uint64_t offset = be64_to_cpu(packet->offset[i]);
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if (offset > (block->used_length - qemu_target_page_size())) {
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error_setg(errp, "multifd: offset too long %" PRIu64
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" (max " RAM_ADDR_FMT ")",
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offset, block->max_length);
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return -1;
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}
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p->pages->iov[i].iov_base = block->host + offset;
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p->pages->iov[i].iov_len = qemu_target_page_size();
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}
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return 0;
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}
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struct {
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MultiFDSendParams *params;
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/* array of pages to sent */
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MultiFDPages_t *pages;
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/* global number of generated multifd packets */
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uint64_t packet_num;
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/* send channels ready */
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QemuSemaphore channels_ready;
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/*
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* Have we already run terminate threads. There is a race when it
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* happens that we got one error while we are exiting.
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* We will use atomic operations. Only valid values are 0 and 1.
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*/
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int exiting;
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} *multifd_send_state;
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/*
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* How we use multifd_send_state->pages and channel->pages?
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*
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* We create a pages for each channel, and a main one. Each time that
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* we need to send a batch of pages we interchange the ones between
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* multifd_send_state and the channel that is sending it. There are
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* two reasons for that:
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* - to not have to do so many mallocs during migration
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* - to make easier to know what to free at the end of migration
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*
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* This way we always know who is the owner of each "pages" struct,
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* and we don't need any locking. It belongs to the migration thread
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* or to the channel thread. Switching is safe because the migration
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* thread is using the channel mutex when changing it, and the channel
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* have to had finish with its own, otherwise pending_job can't be
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* false.
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*/
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static int multifd_send_pages(QEMUFile *f)
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{
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int i;
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static int next_channel;
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MultiFDSendParams *p = NULL; /* make happy gcc */
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MultiFDPages_t *pages = multifd_send_state->pages;
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uint64_t transferred;
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if (atomic_read(&multifd_send_state->exiting)) {
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return -1;
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}
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qemu_sem_wait(&multifd_send_state->channels_ready);
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for (i = next_channel;; i = (i + 1) % migrate_multifd_channels()) {
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p = &multifd_send_state->params[i];
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qemu_mutex_lock(&p->mutex);
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if (p->quit) {
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error_report("%s: channel %d has already quit!", __func__, i);
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qemu_mutex_unlock(&p->mutex);
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return -1;
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}
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if (!p->pending_job) {
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p->pending_job++;
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next_channel = (i + 1) % migrate_multifd_channels();
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break;
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}
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qemu_mutex_unlock(&p->mutex);
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}
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assert(!p->pages->used);
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assert(!p->pages->block);
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p->packet_num = multifd_send_state->packet_num++;
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multifd_send_state->pages = p->pages;
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p->pages = pages;
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transferred = ((uint64_t) pages->used) * qemu_target_page_size()
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+ p->packet_len;
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qemu_file_update_transfer(f, transferred);
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ram_counters.multifd_bytes += transferred;
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ram_counters.transferred += transferred;;
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qemu_mutex_unlock(&p->mutex);
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qemu_sem_post(&p->sem);
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return 1;
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}
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int multifd_queue_page(QEMUFile *f, RAMBlock *block, ram_addr_t offset)
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{
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MultiFDPages_t *pages = multifd_send_state->pages;
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if (!pages->block) {
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pages->block = block;
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}
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if (pages->block == block) {
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pages->offset[pages->used] = offset;
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pages->iov[pages->used].iov_base = block->host + offset;
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pages->iov[pages->used].iov_len = qemu_target_page_size();
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pages->used++;
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if (pages->used < pages->allocated) {
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return 1;
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}
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}
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if (multifd_send_pages(f) < 0) {
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return -1;
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}
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if (pages->block != block) {
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return multifd_queue_page(f, block, offset);
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}
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return 1;
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}
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static void multifd_send_terminate_threads(Error *err)
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{
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int i;
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trace_multifd_send_terminate_threads(err != NULL);
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if (err) {
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MigrationState *s = migrate_get_current();
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migrate_set_error(s, err);
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if (s->state == MIGRATION_STATUS_SETUP ||
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s->state == MIGRATION_STATUS_PRE_SWITCHOVER ||
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s->state == MIGRATION_STATUS_DEVICE ||
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s->state == MIGRATION_STATUS_ACTIVE) {
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migrate_set_state(&s->state, s->state,
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MIGRATION_STATUS_FAILED);
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}
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}
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/*
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* We don't want to exit each threads twice. Depending on where
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* we get the error, or if there are two independent errors in two
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* threads at the same time, we can end calling this function
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* twice.
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*/
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if (atomic_xchg(&multifd_send_state->exiting, 1)) {
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return;
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}
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for (i = 0; i < migrate_multifd_channels(); i++) {
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MultiFDSendParams *p = &multifd_send_state->params[i];
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qemu_mutex_lock(&p->mutex);
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p->quit = true;
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qemu_sem_post(&p->sem);
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qemu_mutex_unlock(&p->mutex);
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}
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}
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void multifd_save_cleanup(void)
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{
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int i;
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if (!migrate_use_multifd()) {
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return;
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}
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multifd_send_terminate_threads(NULL);
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for (i = 0; i < migrate_multifd_channels(); i++) {
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MultiFDSendParams *p = &multifd_send_state->params[i];
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if (p->running) {
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qemu_thread_join(&p->thread);
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}
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}
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for (i = 0; i < migrate_multifd_channels(); i++) {
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MultiFDSendParams *p = &multifd_send_state->params[i];
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socket_send_channel_destroy(p->c);
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p->c = NULL;
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qemu_mutex_destroy(&p->mutex);
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qemu_sem_destroy(&p->sem);
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qemu_sem_destroy(&p->sem_sync);
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g_free(p->name);
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p->name = NULL;
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multifd_pages_clear(p->pages);
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p->pages = NULL;
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p->packet_len = 0;
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g_free(p->packet);
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p->packet = NULL;
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}
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qemu_sem_destroy(&multifd_send_state->channels_ready);
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g_free(multifd_send_state->params);
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multifd_send_state->params = NULL;
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multifd_pages_clear(multifd_send_state->pages);
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multifd_send_state->pages = NULL;
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g_free(multifd_send_state);
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multifd_send_state = NULL;
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}
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void multifd_send_sync_main(QEMUFile *f)
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{
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int i;
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if (!migrate_use_multifd()) {
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return;
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}
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if (multifd_send_state->pages->used) {
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if (multifd_send_pages(f) < 0) {
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error_report("%s: multifd_send_pages fail", __func__);
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return;
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}
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}
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for (i = 0; i < migrate_multifd_channels(); i++) {
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MultiFDSendParams *p = &multifd_send_state->params[i];
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trace_multifd_send_sync_main_signal(p->id);
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qemu_mutex_lock(&p->mutex);
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if (p->quit) {
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error_report("%s: channel %d has already quit", __func__, i);
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qemu_mutex_unlock(&p->mutex);
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return;
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}
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p->packet_num = multifd_send_state->packet_num++;
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p->flags |= MULTIFD_FLAG_SYNC;
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p->pending_job++;
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qemu_file_update_transfer(f, p->packet_len);
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ram_counters.multifd_bytes += p->packet_len;
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ram_counters.transferred += p->packet_len;
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qemu_mutex_unlock(&p->mutex);
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qemu_sem_post(&p->sem);
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}
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for (i = 0; i < migrate_multifd_channels(); i++) {
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MultiFDSendParams *p = &multifd_send_state->params[i];
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trace_multifd_send_sync_main_wait(p->id);
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qemu_sem_wait(&p->sem_sync);
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}
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trace_multifd_send_sync_main(multifd_send_state->packet_num);
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}
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static void *multifd_send_thread(void *opaque)
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{
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MultiFDSendParams *p = opaque;
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Error *local_err = NULL;
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int ret = 0;
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uint32_t flags = 0;
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trace_multifd_send_thread_start(p->id);
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rcu_register_thread();
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if (multifd_send_initial_packet(p, &local_err) < 0) {
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ret = -1;
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goto out;
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}
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/* initial packet */
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p->num_packets = 1;
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while (true) {
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qemu_sem_wait(&p->sem);
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if (atomic_read(&multifd_send_state->exiting)) {
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break;
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}
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qemu_mutex_lock(&p->mutex);
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if (p->pending_job) {
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uint32_t used = p->pages->used;
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uint64_t packet_num = p->packet_num;
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flags = p->flags;
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p->next_packet_size = used * qemu_target_page_size();
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multifd_send_fill_packet(p);
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p->flags = 0;
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p->num_packets++;
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p->num_pages += used;
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p->pages->used = 0;
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p->pages->block = NULL;
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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 = qio_channel_writev_all(p->c, p->pages->iov,
|
|
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);
|
|
|
|
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);
|
|
}
|
|
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_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;
|
|
int ret = 0;
|
|
|
|
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;
|
|
}
|
|
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 ret;
|
|
}
|
|
|
|
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;
|
|
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 = qio_channel_readv_all(p->c, p->pages->iov,
|
|
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);
|
|
|
|
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);
|
|
}
|
|
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();
|
|
}
|
|
|