/* * QEMU live migration * * Copyright IBM, Corp. 2008 * * Authors: * Anthony Liguori <aliguori@us.ibm.com> * * This work is licensed under the terms of the GNU GPL, version 2. See * the COPYING file in the top-level directory. * */ #include "qemu-common.h" #include "qemu_socket.h" #include "migration.h" #include "qemu-char.h" #include "buffered_file.h" #include "block.h" //#define DEBUG_MIGRATION_TCP #ifdef DEBUG_MIGRATION_TCP #define DPRINTF(fmt, ...) \ do { printf("migration-tcp: " fmt, ## __VA_ARGS__); } while (0) #else #define DPRINTF(fmt, ...) \ do { } while (0) #endif static int socket_errno(MigrationState *s) { return socket_error(); } static int socket_write(MigrationState *s, const void * buf, size_t size) { return send(s->fd, buf, size, 0); } static int tcp_close(MigrationState *s) { DPRINTF("tcp_close\n"); if (s->fd != -1) { close(s->fd); s->fd = -1; } return 0; } static void tcp_wait_for_connect(void *opaque) { MigrationState *s = opaque; int val, ret; socklen_t valsize = sizeof(val); DPRINTF("connect completed\n"); do { ret = getsockopt(s->fd, SOL_SOCKET, SO_ERROR, (void *) &val, &valsize); } while (ret == -1 && (socket_error()) == EINTR); if (ret < 0) { migrate_fd_error(s); return; } qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL); if (val == 0) migrate_fd_connect(s); else { DPRINTF("error connecting %d\n", val); migrate_fd_error(s); } } int tcp_start_outgoing_migration(MigrationState *s, const char *host_port) { struct sockaddr_in addr; int ret; ret = parse_host_port(&addr, host_port); if (ret < 0) { return ret; } s->get_error = socket_errno; s->write = socket_write; s->close = tcp_close; s->fd = qemu_socket(PF_INET, SOCK_STREAM, 0); if (s->fd == -1) { DPRINTF("Unable to open socket"); return -socket_error(); } socket_set_nonblock(s->fd); do { ret = connect(s->fd, (struct sockaddr *)&addr, sizeof(addr)); if (ret == -1) { ret = -socket_error(); } if (ret == -EINPROGRESS || ret == -EWOULDBLOCK) { qemu_set_fd_handler2(s->fd, NULL, NULL, tcp_wait_for_connect, s); return 0; } } while (ret == -EINTR); if (ret < 0) { DPRINTF("connect failed\n"); migrate_fd_error(s); return ret; } migrate_fd_connect(s); return 0; } static void tcp_accept_incoming_migration(void *opaque) { struct sockaddr_in addr; socklen_t addrlen = sizeof(addr); int s = (intptr_t)opaque; QEMUFile *f; int c; do { c = qemu_accept(s, (struct sockaddr *)&addr, &addrlen); } while (c == -1 && socket_error() == EINTR); DPRINTF("accepted migration\n"); if (c == -1) { fprintf(stderr, "could not accept migration connection\n"); goto out2; } f = qemu_fopen_socket(c); if (f == NULL) { fprintf(stderr, "could not qemu_fopen socket\n"); goto out; } process_incoming_migration(f); qemu_fclose(f); out: close(c); out2: qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL); close(s); } int tcp_start_incoming_migration(const char *host_port) { struct sockaddr_in addr; int val; int s; DPRINTF("Attempting to start an incoming migration\n"); if (parse_host_port(&addr, host_port) < 0) { fprintf(stderr, "invalid host/port combination: %s\n", host_port); return -EINVAL; } s = qemu_socket(PF_INET, SOCK_STREAM, 0); if (s == -1) { return -socket_error(); } val = 1; setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&val, sizeof(val)); if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) == -1) { goto err; } if (listen(s, 1) == -1) { goto err; } qemu_set_fd_handler2(s, NULL, tcp_accept_incoming_migration, NULL, (void *)(intptr_t)s); return 0; err: close(s); return -socket_error(); }