Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 1 | /* |
| 2 | * QEMU live migration via Unix Domain Sockets |
| 3 | * |
| 4 | * Copyright Red Hat, Inc. 2009 |
| 5 | * |
| 6 | * Authors: |
| 7 | * Chris Lalancette <clalance@redhat.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" |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 18 | #include "buffered_file.h" |
| 19 | #include "block.h" |
| 20 | |
| 21 | //#define DEBUG_MIGRATION_UNIX |
| 22 | |
| 23 | #ifdef DEBUG_MIGRATION_UNIX |
malc | d0f2c4c | 2010-02-07 02:03:50 +0300 | [diff] [blame] | 24 | #define DPRINTF(fmt, ...) \ |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 25 | do { printf("migration-unix: " fmt, ## __VA_ARGS__); } while (0) |
| 26 | #else |
malc | d0f2c4c | 2010-02-07 02:03:50 +0300 | [diff] [blame] | 27 | #define DPRINTF(fmt, ...) \ |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 28 | do { } while (0) |
| 29 | #endif |
| 30 | |
Juan Quintela | 22f00a4 | 2010-05-11 15:56:35 +0200 | [diff] [blame] | 31 | static int unix_errno(MigrationState *s) |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 32 | { |
| 33 | return errno; |
| 34 | } |
| 35 | |
Juan Quintela | 22f00a4 | 2010-05-11 15:56:35 +0200 | [diff] [blame] | 36 | static int unix_write(MigrationState *s, const void * buf, size_t size) |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 37 | { |
| 38 | return write(s->fd, buf, size); |
| 39 | } |
| 40 | |
Juan Quintela | 22f00a4 | 2010-05-11 15:56:35 +0200 | [diff] [blame] | 41 | static int unix_close(MigrationState *s) |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 42 | { |
malc | d0f2c4c | 2010-02-07 02:03:50 +0300 | [diff] [blame] | 43 | DPRINTF("unix_close\n"); |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 44 | if (s->fd != -1) { |
| 45 | close(s->fd); |
| 46 | s->fd = -1; |
| 47 | } |
| 48 | return 0; |
| 49 | } |
| 50 | |
| 51 | static void unix_wait_for_connect(void *opaque) |
| 52 | { |
Juan Quintela | 22f00a4 | 2010-05-11 15:56:35 +0200 | [diff] [blame] | 53 | MigrationState *s = opaque; |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 54 | int val, ret; |
| 55 | socklen_t valsize = sizeof(val); |
| 56 | |
malc | d0f2c4c | 2010-02-07 02:03:50 +0300 | [diff] [blame] | 57 | DPRINTF("connect completed\n"); |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 58 | do { |
| 59 | ret = getsockopt(s->fd, SOL_SOCKET, SO_ERROR, (void *) &val, &valsize); |
Juan Quintela | efab471 | 2011-02-23 11:52:12 +0100 | [diff] [blame] | 60 | } while (ret == -1 && errno == EINTR); |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 61 | |
| 62 | if (ret < 0) { |
| 63 | migrate_fd_error(s); |
| 64 | return; |
| 65 | } |
| 66 | |
| 67 | qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL); |
| 68 | |
| 69 | if (val == 0) |
| 70 | migrate_fd_connect(s); |
| 71 | else { |
malc | d0f2c4c | 2010-02-07 02:03:50 +0300 | [diff] [blame] | 72 | DPRINTF("error connecting %d\n", val); |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 73 | migrate_fd_error(s); |
| 74 | } |
| 75 | } |
| 76 | |
Juan Quintela | 07af445 | 2010-05-11 22:27:45 +0200 | [diff] [blame] | 77 | int unix_start_outgoing_migration(MigrationState *s, const char *path) |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 78 | { |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 79 | struct sockaddr_un addr; |
| 80 | int ret; |
| 81 | |
| 82 | addr.sun_family = AF_UNIX; |
| 83 | snprintf(addr.sun_path, sizeof(addr.sun_path), "%s", path); |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 84 | s->get_error = unix_errno; |
| 85 | s->write = unix_write; |
| 86 | s->close = unix_close; |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 87 | |
Kevin Wolf | 40ff6d7 | 2009-12-02 12:24:42 +0100 | [diff] [blame] | 88 | s->fd = qemu_socket(PF_UNIX, SOCK_STREAM, 0); |
Juan Quintela | ee86c61 | 2011-02-23 20:44:29 +0100 | [diff] [blame] | 89 | if (s->fd == -1) { |
malc | d0f2c4c | 2010-02-07 02:03:50 +0300 | [diff] [blame] | 90 | DPRINTF("Unable to open socket"); |
Juan Quintela | 8414ff3 | 2011-02-23 19:56:52 +0100 | [diff] [blame] | 91 | return -errno; |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 92 | } |
| 93 | |
| 94 | socket_set_nonblock(s->fd); |
| 95 | |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 96 | do { |
| 97 | ret = connect(s->fd, (struct sockaddr *)&addr, sizeof(addr)); |
Juan Quintela | 8414ff3 | 2011-02-23 19:56:52 +0100 | [diff] [blame] | 98 | if (ret == -1) { |
Juan Quintela | efab471 | 2011-02-23 11:52:12 +0100 | [diff] [blame] | 99 | ret = -errno; |
Juan Quintela | 8414ff3 | 2011-02-23 19:56:52 +0100 | [diff] [blame] | 100 | } |
| 101 | if (ret == -EINPROGRESS || ret == -EWOULDBLOCK) { |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 102 | qemu_set_fd_handler2(s->fd, NULL, NULL, unix_wait_for_connect, s); |
Juan Quintela | 8414ff3 | 2011-02-23 19:56:52 +0100 | [diff] [blame] | 103 | return 0; |
| 104 | } |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 105 | } while (ret == -EINTR); |
| 106 | |
Juan Quintela | 8414ff3 | 2011-02-23 19:56:52 +0100 | [diff] [blame] | 107 | if (ret < 0) { |
malc | d0f2c4c | 2010-02-07 02:03:50 +0300 | [diff] [blame] | 108 | DPRINTF("connect failed\n"); |
Juan Quintela | 8414ff3 | 2011-02-23 19:56:52 +0100 | [diff] [blame] | 109 | migrate_fd_error(s); |
| 110 | return ret; |
Daniel P. Berrange | 2dd650e | 2009-12-11 21:01:14 +0000 | [diff] [blame] | 111 | } |
Juan Quintela | 8414ff3 | 2011-02-23 19:56:52 +0100 | [diff] [blame] | 112 | migrate_fd_connect(s); |
Juan Quintela | 07af445 | 2010-05-11 22:27:45 +0200 | [diff] [blame] | 113 | return 0; |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 114 | } |
| 115 | |
| 116 | static void unix_accept_incoming_migration(void *opaque) |
| 117 | { |
| 118 | struct sockaddr_un addr; |
| 119 | socklen_t addrlen = sizeof(addr); |
Stefan Weil | e0efb99 | 2011-02-23 19:09:16 +0100 | [diff] [blame] | 120 | int s = (intptr_t)opaque; |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 121 | QEMUFile *f; |
Juan Quintela | 511c023 | 2010-06-09 14:10:55 +0200 | [diff] [blame] | 122 | int c; |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 123 | |
| 124 | do { |
Kevin Wolf | 40ff6d7 | 2009-12-02 12:24:42 +0100 | [diff] [blame] | 125 | c = qemu_accept(s, (struct sockaddr *)&addr, &addrlen); |
Juan Quintela | efab471 | 2011-02-23 11:52:12 +0100 | [diff] [blame] | 126 | } while (c == -1 && errno == EINTR); |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 127 | |
malc | d0f2c4c | 2010-02-07 02:03:50 +0300 | [diff] [blame] | 128 | DPRINTF("accepted migration\n"); |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 129 | |
| 130 | if (c == -1) { |
| 131 | fprintf(stderr, "could not accept migration connection\n"); |
Juan Quintela | ee86c61 | 2011-02-23 20:44:29 +0100 | [diff] [blame] | 132 | goto out2; |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 133 | } |
| 134 | |
| 135 | f = qemu_fopen_socket(c); |
| 136 | if (f == NULL) { |
| 137 | fprintf(stderr, "could not qemu_fopen socket\n"); |
| 138 | goto out; |
| 139 | } |
| 140 | |
Juan Quintela | 511c023 | 2010-06-09 14:10:55 +0200 | [diff] [blame] | 141 | process_incoming_migration(f); |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 142 | qemu_fclose(f); |
| 143 | out: |
Juan Quintela | ee86c61 | 2011-02-23 20:44:29 +0100 | [diff] [blame] | 144 | close(c); |
| 145 | out2: |
Juan Quintela | cfaf6d3 | 2010-03-10 00:10:35 +0100 | [diff] [blame] | 146 | qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL); |
| 147 | close(s); |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 148 | } |
| 149 | |
| 150 | int unix_start_incoming_migration(const char *path) |
| 151 | { |
Juan Quintela | ee86c61 | 2011-02-23 20:44:29 +0100 | [diff] [blame] | 152 | struct sockaddr_un addr; |
| 153 | int s; |
| 154 | int ret; |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 155 | |
malc | d0f2c4c | 2010-02-07 02:03:50 +0300 | [diff] [blame] | 156 | DPRINTF("Attempting to start an incoming migration\n"); |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 157 | |
Juan Quintela | ee86c61 | 2011-02-23 20:44:29 +0100 | [diff] [blame] | 158 | s = qemu_socket(PF_UNIX, SOCK_STREAM, 0); |
| 159 | if (s == -1) { |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 160 | fprintf(stderr, "Could not open unix socket: %s\n", strerror(errno)); |
Juan Quintela | ee86c61 | 2011-02-23 20:44:29 +0100 | [diff] [blame] | 161 | return -errno; |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 162 | } |
| 163 | |
Juan Quintela | ee86c61 | 2011-02-23 20:44:29 +0100 | [diff] [blame] | 164 | memset(&addr, 0, sizeof(addr)); |
| 165 | addr.sun_family = AF_UNIX; |
| 166 | snprintf(addr.sun_path, sizeof(addr.sun_path), "%s", path); |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 167 | |
Juan Quintela | ee86c61 | 2011-02-23 20:44:29 +0100 | [diff] [blame] | 168 | unlink(addr.sun_path); |
| 169 | if (bind(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) { |
| 170 | ret = -errno; |
| 171 | fprintf(stderr, "bind(unix:%s): %s\n", addr.sun_path, strerror(errno)); |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 172 | goto err; |
| 173 | } |
Juan Quintela | ee86c61 | 2011-02-23 20:44:29 +0100 | [diff] [blame] | 174 | if (listen(s, 1) == -1) { |
| 175 | fprintf(stderr, "listen(unix:%s): %s\n", addr.sun_path, |
| 176 | strerror(errno)); |
| 177 | ret = -errno; |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 178 | goto err; |
| 179 | } |
| 180 | |
Juan Quintela | ee86c61 | 2011-02-23 20:44:29 +0100 | [diff] [blame] | 181 | qemu_set_fd_handler2(s, NULL, unix_accept_incoming_migration, NULL, |
| 182 | (void *)(intptr_t)s); |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 183 | |
| 184 | return 0; |
| 185 | |
| 186 | err: |
Juan Quintela | ee86c61 | 2011-02-23 20:44:29 +0100 | [diff] [blame] | 187 | close(s); |
| 188 | return ret; |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 189 | } |