File:  [Qemu by Fabrice Bellard] / qemu / migration-tcp.c
Revision 1.1.1.2 (vendor branch): download - view: text, annotated - select for diffs
Tue Apr 24 17:20:15 2018 UTC (2 years, 4 months ago) by root
Branches: qemu, MAIN
CVS tags: qemu0111, qemu0110, HEAD
qemu 0.11.0

    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:     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);
  169:     if (autostart)
  170:         vm_start();
  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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