File:  [Qemu by Fabrice Bellard] / qemu / migration-tcp.c
Revision 1.1.1.1 (vendor branch): download - view: text, annotated - select for diffs
Tue Apr 24 16:50:15 2018 UTC (3 years, 1 month ago) by root
Branches: qemu, MAIN
CVS tags: qemu0105, qemu0104, qemu0103, qemu0102, qemu0101, qemu0100, HEAD
qemu 0.10.0

    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 "console.h"
   20: #include "buffered_file.h"
   21: #include "block.h"
   22: 
   23: //#define DEBUG_MIGRATION_TCP
   24: 
   25: #ifdef DEBUG_MIGRATION_TCP
   26: #define dprintf(fmt, ...) \
   27:     do { printf("migration-tcp: " fmt, ## __VA_ARGS__); } while (0)
   28: #else
   29: #define dprintf(fmt, ...) \
   30:     do { } while (0)
   31: #endif
   32: 
   33: static int socket_errno(FdMigrationState *s)
   34: {
   35:     return socket_error();
   36: }
   37: 
   38: static int socket_write(FdMigrationState *s, const void * buf, size_t size)
   39: {
   40:     return send(s->fd, buf, size, 0);
   41: }
   42: 
   43: static int tcp_close(FdMigrationState *s)
   44: {
   45:     dprintf("tcp_close\n");
   46:     if (s->fd != -1) {
   47:         close(s->fd);
   48:         s->fd = -1;
   49:     }
   50:     return 0;
   51: }
   52: 
   53: 
   54: static void tcp_wait_for_connect(void *opaque)
   55: {
   56:     FdMigrationState *s = opaque;
   57:     int val, ret;
   58:     socklen_t valsize = sizeof(val);
   59: 
   60:     dprintf("connect completed\n");
   61:     do {
   62:         ret = getsockopt(s->fd, SOL_SOCKET, SO_ERROR, &val, &valsize);
   63:     } while (ret == -1 && (s->get_error(s)) == EINTR);
   64: 
   65:     if (ret < 0) {
   66:         migrate_fd_error(s);
   67:         return;
   68:     }
   69: 
   70:     qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
   71: 
   72:     if (val == 0)
   73:         migrate_fd_connect(s);
   74:     else {
   75:         dprintf("error connecting %d\n", val);
   76:         migrate_fd_error(s);
   77:     }
   78: }
   79: 
   80: MigrationState *tcp_start_outgoing_migration(const char *host_port,
   81:                                              int64_t bandwidth_limit,
   82:                                              int async)
   83: {
   84:     struct sockaddr_in addr;
   85:     FdMigrationState *s;
   86:     int ret;
   87: 
   88:     if (parse_host_port(&addr, host_port) < 0)
   89:         return NULL;
   90: 
   91:     s = qemu_mallocz(sizeof(*s));
   92: 
   93:     s->get_error = socket_errno;
   94:     s->write = socket_write;
   95:     s->close = tcp_close;
   96:     s->mig_state.cancel = migrate_fd_cancel;
   97:     s->mig_state.get_status = migrate_fd_get_status;
   98:     s->mig_state.release = migrate_fd_release;
   99: 
  100:     s->state = MIG_STATE_ACTIVE;
  101:     s->detach = !async;
  102:     s->bandwidth_limit = bandwidth_limit;
  103:     s->fd = socket(PF_INET, SOCK_STREAM, 0);
  104:     if (s->fd == -1) {
  105:         qemu_free(s);
  106:         return NULL;
  107:     }
  108: 
  109:     socket_set_nonblock(s->fd);
  110: 
  111:     if (s->detach == 1) {
  112:         dprintf("detaching from monitor\n");
  113:         monitor_suspend();
  114:         s->detach = 2;
  115:     }
  116: 
  117:     do {
  118:         ret = connect(s->fd, (struct sockaddr *)&addr, sizeof(addr));
  119:         if (ret == -1)
  120:             ret = -(s->get_error(s));
  121: 
  122:         if (ret == -EINPROGRESS || ret == -EWOULDBLOCK)
  123:             qemu_set_fd_handler2(s->fd, NULL, NULL, tcp_wait_for_connect, s);
  124:     } while (ret == -EINTR);
  125: 
  126:     if (ret < 0 && ret != -EINPROGRESS && ret != -EWOULDBLOCK) {
  127:         dprintf("connect failed\n");
  128:         close(s->fd);
  129:         qemu_free(s);
  130:         return NULL;
  131:     } else if (ret >= 0)
  132:         migrate_fd_connect(s);
  133: 
  134:     return &s->mig_state;
  135: }
  136: 
  137: static void tcp_accept_incoming_migration(void *opaque)
  138: {
  139:     struct sockaddr_in addr;
  140:     socklen_t addrlen = sizeof(addr);
  141:     int s = (unsigned long)opaque;
  142:     QEMUFile *f;
  143:     int c, ret;
  144: 
  145:     do {
  146:         c = accept(s, (struct sockaddr *)&addr, &addrlen);
  147:     } while (c == -1 && socket_error() == EINTR);
  148: 
  149:     dprintf("accepted migration\n");
  150: 
  151:     if (c == -1) {
  152:         fprintf(stderr, "could not accept migration connection\n");
  153:         return;
  154:     }
  155: 
  156:     f = qemu_fopen_socket(c);
  157:     if (f == NULL) {
  158:         fprintf(stderr, "could not qemu_fopen socket\n");
  159:         goto out;
  160:     }
  161: 
  162:     vm_stop(0); /* just in case */
  163:     ret = qemu_loadvm_state(f);
  164:     if (ret < 0) {
  165:         fprintf(stderr, "load of migration failed\n");
  166:         goto out_fopen;
  167:     }
  168:     qemu_announce_self();
  169:     dprintf("successfully loaded vm state\n");
  170: 
  171:     /* we've successfully migrated, close the server socket */
  172:     qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL);
  173:     close(s);
  174: 
  175:     vm_start();
  176: 
  177: out_fopen:
  178:     qemu_fclose(f);
  179: out:
  180:     close(c);
  181: }
  182: 
  183: int tcp_start_incoming_migration(const char *host_port)
  184: {
  185:     struct sockaddr_in addr;
  186:     int val;
  187:     int s;
  188: 
  189:     if (parse_host_port(&addr, host_port) < 0) {
  190:         fprintf(stderr, "invalid host/port combination: %s\n", host_port);
  191:         return -EINVAL;
  192:     }
  193: 
  194:     s = socket(PF_INET, SOCK_STREAM, 0);
  195:     if (s == -1)
  196:         return -socket_error();
  197: 
  198:     val = 1;
  199:     setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&val, sizeof(val));
  200: 
  201:     if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) == -1)
  202:         goto err;
  203: 
  204:     if (listen(s, 1) == -1)
  205:         goto err;
  206: 
  207:     qemu_set_fd_handler2(s, NULL, tcp_accept_incoming_migration, NULL,
  208:                          (void *)(unsigned long)s);
  209: 
  210:     return 0;
  211: 
  212: err:
  213:     close(s);
  214:     return -socket_error();
  215: }

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