Annotation of qemu/migration-tcp.c, revision 1.1.1.2

1.1       root        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 {
1.1.1.2 ! root       61:         ret = getsockopt(s->fd, SOL_SOCKET, SO_ERROR, (void *) &val, &valsize);
1.1       root       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,
1.1.1.2 ! root       81:                                              int detach)
1.1       root       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;
1.1.1.2 ! root      100:     s->mon_resume = NULL;
1.1       root      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: 
1.1.1.2 ! root      110:     if (!detach)
        !           111:         migrate_fd_monitor_suspend(s);
1.1       root      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:     ret = qemu_loadvm_state(f);
                    159:     if (ret < 0) {
                    160:         fprintf(stderr, "load of migration failed\n");
                    161:         goto out_fopen;
                    162:     }
                    163:     qemu_announce_self();
                    164:     dprintf("successfully loaded vm state\n");
                    165: 
                    166:     /* we've successfully migrated, close the server socket */
                    167:     qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL);
                    168:     close(s);
1.1.1.2 ! root      169:     if (autostart)
        !           170:         vm_start();
1.1       root      171: 
                    172: out_fopen:
                    173:     qemu_fclose(f);
                    174: out:
                    175:     close(c);
                    176: }
                    177: 
                    178: int tcp_start_incoming_migration(const char *host_port)
                    179: {
                    180:     struct sockaddr_in addr;
                    181:     int val;
                    182:     int s;
                    183: 
                    184:     if (parse_host_port(&addr, host_port) < 0) {
                    185:         fprintf(stderr, "invalid host/port combination: %s\n", host_port);
                    186:         return -EINVAL;
                    187:     }
                    188: 
                    189:     s = socket(PF_INET, SOCK_STREAM, 0);
                    190:     if (s == -1)
                    191:         return -socket_error();
                    192: 
                    193:     val = 1;
                    194:     setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&val, sizeof(val));
                    195: 
                    196:     if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) == -1)
                    197:         goto err;
                    198: 
                    199:     if (listen(s, 1) == -1)
                    200:         goto err;
                    201: 
                    202:     qemu_set_fd_handler2(s, NULL, tcp_accept_incoming_migration, NULL,
                    203:                          (void *)(unsigned long)s);
                    204: 
                    205:     return 0;
                    206: 
                    207: err:
                    208:     close(s);
                    209:     return -socket_error();
                    210: }

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