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 | * |
Paolo Bonzini | 6b620ca | 2012-01-13 17:44:23 +0100 | [diff] [blame] | 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. |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 14 | */ |
| 15 | |
| 16 | #include "qemu-common.h" |
| 17 | #include "qemu_socket.h" |
| 18 | #include "migration.h" |
| 19 | #include "qemu-char.h" |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 20 | #include "buffered_file.h" |
| 21 | #include "block.h" |
| 22 | |
| 23 | //#define DEBUG_MIGRATION_UNIX |
| 24 | |
| 25 | #ifdef DEBUG_MIGRATION_UNIX |
malc | d0f2c4c | 2010-02-07 02:03:50 +0300 | [diff] [blame] | 26 | #define DPRINTF(fmt, ...) \ |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 27 | do { printf("migration-unix: " fmt, ## __VA_ARGS__); } while (0) |
| 28 | #else |
malc | d0f2c4c | 2010-02-07 02:03:50 +0300 | [diff] [blame] | 29 | #define DPRINTF(fmt, ...) \ |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 30 | do { } while (0) |
| 31 | #endif |
| 32 | |
Juan Quintela | 22f00a4 | 2010-05-11 15:56:35 +0200 | [diff] [blame] | 33 | static int unix_errno(MigrationState *s) |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 34 | { |
| 35 | return errno; |
| 36 | } |
| 37 | |
Juan Quintela | 22f00a4 | 2010-05-11 15:56:35 +0200 | [diff] [blame] | 38 | static int unix_write(MigrationState *s, const void * buf, size_t size) |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 39 | { |
| 40 | return write(s->fd, buf, size); |
| 41 | } |
| 42 | |
Juan Quintela | 22f00a4 | 2010-05-11 15:56:35 +0200 | [diff] [blame] | 43 | static int unix_close(MigrationState *s) |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 44 | { |
Eduardo Habkost | 8160bfb | 2011-11-10 10:41:48 -0200 | [diff] [blame] | 45 | int r = 0; |
malc | d0f2c4c | 2010-02-07 02:03:50 +0300 | [diff] [blame] | 46 | DPRINTF("unix_close\n"); |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 47 | if (s->fd != -1) { |
Eduardo Habkost | 8160bfb | 2011-11-10 10:41:48 -0200 | [diff] [blame] | 48 | if (close(s->fd) < 0) { |
| 49 | r = -errno; |
| 50 | } |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 51 | s->fd = -1; |
| 52 | } |
Eduardo Habkost | 8160bfb | 2011-11-10 10:41:48 -0200 | [diff] [blame] | 53 | return r; |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 54 | } |
| 55 | |
| 56 | static void unix_wait_for_connect(void *opaque) |
| 57 | { |
Juan Quintela | 22f00a4 | 2010-05-11 15:56:35 +0200 | [diff] [blame] | 58 | MigrationState *s = opaque; |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 59 | int val, ret; |
| 60 | socklen_t valsize = sizeof(val); |
| 61 | |
malc | d0f2c4c | 2010-02-07 02:03:50 +0300 | [diff] [blame] | 62 | DPRINTF("connect completed\n"); |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 63 | do { |
| 64 | ret = getsockopt(s->fd, SOL_SOCKET, SO_ERROR, (void *) &val, &valsize); |
Juan Quintela | efab471 | 2011-02-23 11:52:12 +0100 | [diff] [blame] | 65 | } while (ret == -1 && errno == EINTR); |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 66 | |
| 67 | if (ret < 0) { |
| 68 | migrate_fd_error(s); |
| 69 | return; |
| 70 | } |
| 71 | |
| 72 | qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL); |
| 73 | |
| 74 | if (val == 0) |
| 75 | migrate_fd_connect(s); |
| 76 | else { |
malc | d0f2c4c | 2010-02-07 02:03:50 +0300 | [diff] [blame] | 77 | DPRINTF("error connecting %d\n", val); |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 78 | migrate_fd_error(s); |
| 79 | } |
| 80 | } |
| 81 | |
Juan Quintela | 07af445 | 2010-05-11 22:27:45 +0200 | [diff] [blame] | 82 | int unix_start_outgoing_migration(MigrationState *s, const char *path) |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 83 | { |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 84 | struct sockaddr_un addr; |
| 85 | int ret; |
| 86 | |
| 87 | addr.sun_family = AF_UNIX; |
| 88 | snprintf(addr.sun_path, sizeof(addr.sun_path), "%s", path); |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 89 | s->get_error = unix_errno; |
| 90 | s->write = unix_write; |
| 91 | s->close = unix_close; |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 92 | |
Kevin Wolf | 40ff6d7 | 2009-12-02 12:24:42 +0100 | [diff] [blame] | 93 | s->fd = qemu_socket(PF_UNIX, SOCK_STREAM, 0); |
Juan Quintela | ee86c61 | 2011-02-23 20:44:29 +0100 | [diff] [blame] | 94 | if (s->fd == -1) { |
malc | d0f2c4c | 2010-02-07 02:03:50 +0300 | [diff] [blame] | 95 | DPRINTF("Unable to open socket"); |
Juan Quintela | 8414ff3 | 2011-02-23 19:56:52 +0100 | [diff] [blame] | 96 | return -errno; |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 97 | } |
| 98 | |
| 99 | socket_set_nonblock(s->fd); |
| 100 | |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 101 | do { |
| 102 | ret = connect(s->fd, (struct sockaddr *)&addr, sizeof(addr)); |
Juan Quintela | 8414ff3 | 2011-02-23 19:56:52 +0100 | [diff] [blame] | 103 | if (ret == -1) { |
Juan Quintela | efab471 | 2011-02-23 11:52:12 +0100 | [diff] [blame] | 104 | ret = -errno; |
Juan Quintela | 8414ff3 | 2011-02-23 19:56:52 +0100 | [diff] [blame] | 105 | } |
| 106 | if (ret == -EINPROGRESS || ret == -EWOULDBLOCK) { |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 107 | 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] | 108 | return 0; |
| 109 | } |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 110 | } while (ret == -EINTR); |
| 111 | |
Juan Quintela | 8414ff3 | 2011-02-23 19:56:52 +0100 | [diff] [blame] | 112 | if (ret < 0) { |
malc | d0f2c4c | 2010-02-07 02:03:50 +0300 | [diff] [blame] | 113 | DPRINTF("connect failed\n"); |
Juan Quintela | 8414ff3 | 2011-02-23 19:56:52 +0100 | [diff] [blame] | 114 | migrate_fd_error(s); |
| 115 | return ret; |
Daniel P. Berrange | 2dd650e | 2009-12-11 21:01:14 +0000 | [diff] [blame] | 116 | } |
Juan Quintela | 8414ff3 | 2011-02-23 19:56:52 +0100 | [diff] [blame] | 117 | migrate_fd_connect(s); |
Juan Quintela | 07af445 | 2010-05-11 22:27:45 +0200 | [diff] [blame] | 118 | return 0; |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 119 | } |
| 120 | |
| 121 | static void unix_accept_incoming_migration(void *opaque) |
| 122 | { |
| 123 | struct sockaddr_un addr; |
| 124 | socklen_t addrlen = sizeof(addr); |
Stefan Weil | e0efb99 | 2011-02-23 19:09:16 +0100 | [diff] [blame] | 125 | int s = (intptr_t)opaque; |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 126 | QEMUFile *f; |
Juan Quintela | 511c023 | 2010-06-09 14:10:55 +0200 | [diff] [blame] | 127 | int c; |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 128 | |
| 129 | do { |
Kevin Wolf | 40ff6d7 | 2009-12-02 12:24:42 +0100 | [diff] [blame] | 130 | c = qemu_accept(s, (struct sockaddr *)&addr, &addrlen); |
Juan Quintela | efab471 | 2011-02-23 11:52:12 +0100 | [diff] [blame] | 131 | } while (c == -1 && errno == EINTR); |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 132 | |
malc | d0f2c4c | 2010-02-07 02:03:50 +0300 | [diff] [blame] | 133 | DPRINTF("accepted migration\n"); |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 134 | |
| 135 | if (c == -1) { |
| 136 | fprintf(stderr, "could not accept migration connection\n"); |
Juan Quintela | ee86c61 | 2011-02-23 20:44:29 +0100 | [diff] [blame] | 137 | goto out2; |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 138 | } |
| 139 | |
| 140 | f = qemu_fopen_socket(c); |
| 141 | if (f == NULL) { |
| 142 | fprintf(stderr, "could not qemu_fopen socket\n"); |
| 143 | goto out; |
| 144 | } |
| 145 | |
Juan Quintela | 511c023 | 2010-06-09 14:10:55 +0200 | [diff] [blame] | 146 | process_incoming_migration(f); |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 147 | qemu_fclose(f); |
| 148 | out: |
Juan Quintela | ee86c61 | 2011-02-23 20:44:29 +0100 | [diff] [blame] | 149 | close(c); |
| 150 | out2: |
Juan Quintela | cfaf6d3 | 2010-03-10 00:10:35 +0100 | [diff] [blame] | 151 | qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL); |
| 152 | close(s); |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 153 | } |
| 154 | |
| 155 | int unix_start_incoming_migration(const char *path) |
| 156 | { |
Juan Quintela | ee86c61 | 2011-02-23 20:44:29 +0100 | [diff] [blame] | 157 | struct sockaddr_un addr; |
| 158 | int s; |
| 159 | int ret; |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 160 | |
malc | d0f2c4c | 2010-02-07 02:03:50 +0300 | [diff] [blame] | 161 | DPRINTF("Attempting to start an incoming migration\n"); |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 162 | |
Juan Quintela | ee86c61 | 2011-02-23 20:44:29 +0100 | [diff] [blame] | 163 | s = qemu_socket(PF_UNIX, SOCK_STREAM, 0); |
| 164 | if (s == -1) { |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 165 | fprintf(stderr, "Could not open unix socket: %s\n", strerror(errno)); |
Juan Quintela | ee86c61 | 2011-02-23 20:44:29 +0100 | [diff] [blame] | 166 | return -errno; |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 167 | } |
| 168 | |
Juan Quintela | ee86c61 | 2011-02-23 20:44:29 +0100 | [diff] [blame] | 169 | memset(&addr, 0, sizeof(addr)); |
| 170 | addr.sun_family = AF_UNIX; |
| 171 | snprintf(addr.sun_path, sizeof(addr.sun_path), "%s", path); |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 172 | |
Juan Quintela | ee86c61 | 2011-02-23 20:44:29 +0100 | [diff] [blame] | 173 | unlink(addr.sun_path); |
| 174 | if (bind(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) { |
| 175 | ret = -errno; |
| 176 | fprintf(stderr, "bind(unix:%s): %s\n", addr.sun_path, strerror(errno)); |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 177 | goto err; |
| 178 | } |
Juan Quintela | ee86c61 | 2011-02-23 20:44:29 +0100 | [diff] [blame] | 179 | if (listen(s, 1) == -1) { |
| 180 | fprintf(stderr, "listen(unix:%s): %s\n", addr.sun_path, |
| 181 | strerror(errno)); |
| 182 | ret = -errno; |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 183 | goto err; |
| 184 | } |
| 185 | |
Juan Quintela | ee86c61 | 2011-02-23 20:44:29 +0100 | [diff] [blame] | 186 | qemu_set_fd_handler2(s, NULL, unix_accept_incoming_migration, NULL, |
| 187 | (void *)(intptr_t)s); |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 188 | |
| 189 | return 0; |
| 190 | |
| 191 | err: |
Juan Quintela | ee86c61 | 2011-02-23 20:44:29 +0100 | [diff] [blame] | 192 | close(s); |
| 193 | return ret; |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 194 | } |