File:  [Qemu by Fabrice Bellard] / qemu / migration-tcp.c
Revision 1.1.1.4 (vendor branch): download - view: text, annotated - select for diffs
Tue Apr 24 18:23:02 2018 UTC (2 years, 6 months ago) by root
Branches: qemu, MAIN
CVS tags: qemu0150, qemu0141, qemu0140, qemu0130, HEAD
qemu 0.13.0

    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(Monitor *mon,
   80:                                              const char *host_port,
   81:                                              int64_t bandwidth_limit,
   82:                                              int detach,
   83: 					     int blk,
   84: 					     int inc)
   85: {
   86:     struct sockaddr_in addr;
   87:     FdMigrationState *s;
   88:     int ret;
   89: 
   90:     if (parse_host_port(&addr, host_port) < 0)
   91:         return NULL;
   92: 
   93:     s = qemu_mallocz(sizeof(*s));
   94: 
   95:     s->get_error = socket_errno;
   96:     s->write = socket_write;
   97:     s->close = tcp_close;
   98:     s->mig_state.cancel = migrate_fd_cancel;
   99:     s->mig_state.get_status = migrate_fd_get_status;
  100:     s->mig_state.release = migrate_fd_release;
  101: 
  102:     s->mig_state.blk = blk;
  103:     s->mig_state.shared = inc;
  104: 
  105:     s->state = MIG_STATE_ACTIVE;
  106:     s->mon = NULL;
  107:     s->bandwidth_limit = bandwidth_limit;
  108:     s->fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
  109:     if (s->fd == -1) {
  110:         qemu_free(s);
  111:         return NULL;
  112:     }
  113: 
  114:     socket_set_nonblock(s->fd);
  115: 
  116:     if (!detach) {
  117:         migrate_fd_monitor_suspend(s, mon);
  118:     }
  119: 
  120:     do {
  121:         ret = connect(s->fd, (struct sockaddr *)&addr, sizeof(addr));
  122:         if (ret == -1)
  123:             ret = -(s->get_error(s));
  124: 
  125:         if (ret == -EINPROGRESS || ret == -EWOULDBLOCK)
  126:             qemu_set_fd_handler2(s->fd, NULL, NULL, tcp_wait_for_connect, s);
  127:     } while (ret == -EINTR);
  128: 
  129:     if (ret < 0 && ret != -EINPROGRESS && ret != -EWOULDBLOCK) {
  130:         DPRINTF("connect failed\n");
  131:         migrate_fd_error(s);
  132:     } else if (ret >= 0)
  133:         migrate_fd_connect(s);
  134: 
  135:     return &s->mig_state;
  136: }
  137: 
  138: static void tcp_accept_incoming_migration(void *opaque)
  139: {
  140:     struct sockaddr_in addr;
  141:     socklen_t addrlen = sizeof(addr);
  142:     int s = (unsigned long)opaque;
  143:     QEMUFile *f;
  144:     int c;
  145: 
  146:     do {
  147:         c = qemu_accept(s, (struct sockaddr *)&addr, &addrlen);
  148:     } while (c == -1 && socket_error() == EINTR);
  149: 
  150:     DPRINTF("accepted migration\n");
  151: 
  152:     if (c == -1) {
  153:         fprintf(stderr, "could not accept migration connection\n");
  154:         goto out2;
  155:     }
  156: 
  157:     f = qemu_fopen_socket(c);
  158:     if (f == NULL) {
  159:         fprintf(stderr, "could not qemu_fopen socket\n");
  160:         goto out;
  161:     }
  162: 
  163:     process_incoming_migration(f);
  164:     qemu_fclose(f);
  165: out:
  166:     close(c);
  167: out2:
  168:     qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL);
  169:     close(s);
  170: }
  171: 
  172: int tcp_start_incoming_migration(const char *host_port)
  173: {
  174:     struct sockaddr_in addr;
  175:     int val;
  176:     int s;
  177: 
  178:     if (parse_host_port(&addr, host_port) < 0) {
  179:         fprintf(stderr, "invalid host/port combination: %s\n", host_port);
  180:         return -EINVAL;
  181:     }
  182: 
  183:     s = qemu_socket(PF_INET, SOCK_STREAM, 0);
  184:     if (s == -1)
  185:         return -socket_error();
  186: 
  187:     val = 1;
  188:     setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&val, sizeof(val));
  189: 
  190:     if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) == -1)
  191:         goto err;
  192: 
  193:     if (listen(s, 1) == -1)
  194:         goto err;
  195: 
  196:     qemu_set_fd_handler2(s, NULL, tcp_accept_incoming_migration, NULL,
  197:                          (void *)(unsigned long)s);
  198: 
  199:     return 0;
  200: 
  201: err:
  202:     close(s);
  203:     return -socket_error();
  204: }

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