David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * QEMU live migration |
| 3 | * |
| 4 | * Copyright IBM, Corp. 2008 |
| 5 | * |
| 6 | * Authors: |
| 7 | * Anthony Liguori <aliguori@us.ibm.com> |
| 8 | * |
| 9 | * This work is licensed under the terms of the GNU GPL, version 2. See |
| 10 | * the COPYING file in the top-level directory. |
| 11 | * |
| 12 | */ |
| 13 | |
| 14 | #include "qemu-common.h" |
| 15 | #include "qemu_socket.h" |
| 16 | #include "migration.h" |
| 17 | #include "qemu-char.h" |
| 18 | #include "sysemu.h" |
| 19 | #include "buffered_file.h" |
| 20 | #include "block.h" |
| 21 | |
| 22 | //#define DEBUG_MIGRATION_TCP |
| 23 | |
| 24 | #ifdef DEBUG_MIGRATION_TCP |
| 25 | #define dprintf(fmt, ...) \ |
| 26 | do { printf("migration-tcp: " fmt, ## __VA_ARGS__); } while (0) |
| 27 | #else |
| 28 | #define dprintf(fmt, ...) \ |
| 29 | do { } while (0) |
| 30 | #endif |
| 31 | |
| 32 | static int socket_errno(FdMigrationState *s) |
| 33 | { |
| 34 | return socket_error(); |
| 35 | } |
| 36 | |
| 37 | static int socket_write(FdMigrationState *s, const void * buf, size_t size) |
| 38 | { |
| 39 | return send(s->fd, buf, size, 0); |
| 40 | } |
| 41 | |
| 42 | static int tcp_close(FdMigrationState *s) |
| 43 | { |
| 44 | dprintf("tcp_close\n"); |
| 45 | if (s->fd != -1) { |
| 46 | close(s->fd); |
| 47 | s->fd = -1; |
| 48 | } |
| 49 | return 0; |
| 50 | } |
| 51 | |
| 52 | |
| 53 | static void tcp_wait_for_connect(void *opaque) |
| 54 | { |
| 55 | FdMigrationState *s = opaque; |
| 56 | int val, ret; |
| 57 | socklen_t valsize = sizeof(val); |
| 58 | |
| 59 | dprintf("connect completed\n"); |
| 60 | do { |
| 61 | ret = getsockopt(s->fd, SOL_SOCKET, SO_ERROR, (void *) &val, &valsize); |
| 62 | } while (ret == -1 && (s->get_error(s)) == EINTR); |
| 63 | |
| 64 | if (ret < 0) { |
| 65 | migrate_fd_error(s); |
| 66 | return; |
| 67 | } |
| 68 | |
| 69 | qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL); |
| 70 | |
| 71 | if (val == 0) |
| 72 | migrate_fd_connect(s); |
| 73 | else { |
| 74 | dprintf("error connecting %d\n", val); |
| 75 | migrate_fd_error(s); |
| 76 | } |
| 77 | } |
| 78 | |
| 79 | MigrationState *tcp_start_outgoing_migration(const char *host_port, |
| 80 | int64_t bandwidth_limit, |
| 81 | int detach) |
| 82 | { |
| 83 | struct sockaddr_in addr; |
| 84 | FdMigrationState *s; |
| 85 | int ret; |
| 86 | |
| 87 | if (parse_host_port(&addr, host_port) < 0) |
| 88 | return NULL; |
| 89 | |
| 90 | s = qemu_mallocz(sizeof(*s)); |
| 91 | |
| 92 | s->get_error = socket_errno; |
| 93 | s->write = socket_write; |
| 94 | s->close = tcp_close; |
| 95 | s->mig_state.cancel = migrate_fd_cancel; |
| 96 | s->mig_state.get_status = migrate_fd_get_status; |
| 97 | s->mig_state.release = migrate_fd_release; |
| 98 | |
| 99 | s->state = MIG_STATE_ACTIVE; |
| 100 | s->mon_resume = NULL; |
| 101 | s->bandwidth_limit = bandwidth_limit; |
| 102 | s->fd = socket(PF_INET, SOCK_STREAM, 0); |
| 103 | if (s->fd == -1) { |
| 104 | qemu_free(s); |
| 105 | return NULL; |
| 106 | } |
| 107 | |
| 108 | socket_set_nonblock(s->fd); |
| 109 | |
| 110 | if (!detach) |
| 111 | migrate_fd_monitor_suspend(s); |
| 112 | |
| 113 | do { |
| 114 | ret = connect(s->fd, (struct sockaddr *)&addr, sizeof(addr)); |
| 115 | if (ret == -1) |
| 116 | ret = -(s->get_error(s)); |
| 117 | |
| 118 | if (ret == -EINPROGRESS || ret == -EWOULDBLOCK) |
| 119 | qemu_set_fd_handler2(s->fd, NULL, NULL, tcp_wait_for_connect, s); |
| 120 | } while (ret == -EINTR); |
| 121 | |
| 122 | if (ret < 0 && ret != -EINPROGRESS && ret != -EWOULDBLOCK) { |
| 123 | dprintf("connect failed\n"); |
| 124 | close(s->fd); |
| 125 | qemu_free(s); |
| 126 | return NULL; |
| 127 | } else if (ret >= 0) |
| 128 | migrate_fd_connect(s); |
| 129 | |
| 130 | return &s->mig_state; |
| 131 | } |
| 132 | |
| 133 | static void tcp_accept_incoming_migration(void *opaque) |
| 134 | { |
| 135 | struct sockaddr_in addr; |
| 136 | socklen_t addrlen = sizeof(addr); |
| 137 | int s = (unsigned long)opaque; |
| 138 | QEMUFile *f; |
| 139 | int c, ret; |
| 140 | |
| 141 | do { |
| 142 | c = accept(s, (struct sockaddr *)&addr, &addrlen); |
| 143 | } while (c == -1 && socket_error() == EINTR); |
| 144 | |
| 145 | dprintf("accepted migration\n"); |
| 146 | |
| 147 | if (c == -1) { |
| 148 | fprintf(stderr, "could not accept migration connection\n"); |
| 149 | return; |
| 150 | } |
| 151 | |
| 152 | f = qemu_fopen_socket(c); |
| 153 | if (f == NULL) { |
| 154 | fprintf(stderr, "could not qemu_fopen socket\n"); |
| 155 | goto out; |
| 156 | } |
| 157 | |
| 158 | vm_stop(0); /* just in case */ |
| 159 | ret = qemu_loadvm_state(f); |
| 160 | if (ret < 0) { |
| 161 | fprintf(stderr, "load of migration failed\n"); |
| 162 | goto out_fopen; |
| 163 | } |
| 164 | qemu_announce_self(); |
| 165 | dprintf("successfully loaded vm state\n"); |
| 166 | |
| 167 | /* we've successfully migrated, close the server socket */ |
| 168 | qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL); |
| 169 | close(s); |
| 170 | |
| 171 | vm_start(); |
| 172 | |
| 173 | out_fopen: |
| 174 | qemu_fclose(f); |
| 175 | out: |
| 176 | close(c); |
| 177 | } |
| 178 | |
| 179 | int tcp_start_incoming_migration(const char *host_port) |
| 180 | { |
| 181 | struct sockaddr_in addr; |
| 182 | int val; |
| 183 | int s; |
| 184 | |
| 185 | if (parse_host_port(&addr, host_port) < 0) { |
| 186 | fprintf(stderr, "invalid host/port combination: %s\n", host_port); |
| 187 | return -EINVAL; |
| 188 | } |
| 189 | |
| 190 | s = socket(PF_INET, SOCK_STREAM, 0); |
| 191 | if (s == -1) |
| 192 | return -socket_error(); |
| 193 | |
| 194 | val = 1; |
| 195 | setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&val, sizeof(val)); |
| 196 | |
| 197 | if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) == -1) |
| 198 | goto err; |
| 199 | |
| 200 | if (listen(s, 1) == -1) |
| 201 | goto err; |
| 202 | |
| 203 | qemu_set_fd_handler2(s, NULL, tcp_accept_incoming_migration, NULL, |
| 204 | (void *)(unsigned long)s); |
| 205 | |
| 206 | return 0; |
| 207 | |
| 208 | err: |
| 209 | close(s); |
| 210 | return -socket_error(); |
| 211 | } |