LXR qemu/migration-tcp.c

   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 * Contributions after 2012-01-13 are licensed under the terms of the
  13 * GNU GPL, version 2 or (at your option) any later version.
  14 */
  15
  16#include "qemu-common.h"
  17#include "qemu/sockets.h"
  18#include "migration/migration.h"
  19#include "migration/qemu-file.h"
  20#include "block/block.h"
  21#include "qemu/main-loop.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
  33static void tcp_wait_for_connect(int fd, void *opaque)
  34{
  35    MigrationState *s = opaque;
  36
  37    if (fd < 0) {
  38        DPRINTF("migrate connect error\n");
  39        s->file = NULL;
  40        migrate_fd_error(s);
  41    } else {
  42        DPRINTF("migrate connect success\n");
  43        s->file = qemu_fopen_socket(fd, "wb");
  44        migrate_fd_connect(s);
  45    }
  46}
  47
  48void tcp_start_outgoing_migration(MigrationState *s, const char *host_port, Error **errp)
  49{
  50    inet_nonblocking_connect(host_port, tcp_wait_for_connect, s, errp);
  51}
  52
  53static void tcp_accept_incoming_migration(void *opaque)
  54{
  55    struct sockaddr_in addr;
  56    socklen_t addrlen = sizeof(addr);
  57    int s = (intptr_t)opaque;
  58    QEMUFile *f;
  59    int c;
  60
  61    do {
  62        c = qemu_accept(s, (struct sockaddr *)&addr, &addrlen);
  63    } while (c == -1 && socket_error() == EINTR);
  64    qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL);
  65    closesocket(s);
  66
  67    DPRINTF("accepted migration\n");
  68
  69    if (c == -1) {
  70        fprintf(stderr, "could not accept migration connection\n");
  71        goto out;
  72    }
  73
  74    f = qemu_fopen_socket(c, "rb");
  75    if (f == NULL) {
  76        fprintf(stderr, "could not qemu_fopen socket\n");
  77        goto out;
  78    }
  79
  80    process_incoming_migration(f);
  81    return;
  82
  83out:
  84    closesocket(c);
  85}
  86
  87void tcp_start_incoming_migration(const char *host_port, Error **errp)
  88{
  89    int s;
  90
  91    s = inet_listen(host_port, NULL, 256, SOCK_STREAM, 0, errp);
  92    if (s < 0) {
  93        return;
  94    }
  95
  96    qemu_set_fd_handler2(s, NULL, tcp_accept_incoming_migration, NULL,
  97                         (void *)(intptr_t)s);
  98}
  99