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 | |
Dr. David Alan Gilbert | d99598c | 2014-03-19 13:34:28 +0000 | [diff] [blame] | 16 | #include <string.h> |
| 17 | |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 18 | #include "qemu-common.h" |
Dr. David Alan Gilbert | d99598c | 2014-03-19 13:34:28 +0000 | [diff] [blame] | 19 | #include "qemu/error-report.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 20 | #include "qemu/sockets.h" |
Alex Bligh | 6a1751b | 2013-08-21 16:02:47 +0100 | [diff] [blame] | 21 | #include "qemu/main-loop.h" |
Paolo Bonzini | caf71f8 | 2012-12-17 18:19:50 +0100 | [diff] [blame] | 22 | #include "migration/migration.h" |
Juan Quintela | 557ec5a | 2012-10-03 14:07:31 +0200 | [diff] [blame] | 23 | #include "migration/qemu-file.h" |
Paolo Bonzini | 737e150 | 2012-12-17 18:19:44 +0100 | [diff] [blame] | 24 | #include "block/block.h" |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 25 | |
| 26 | //#define DEBUG_MIGRATION_UNIX |
| 27 | |
| 28 | #ifdef DEBUG_MIGRATION_UNIX |
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 { printf("migration-unix: " fmt, ## __VA_ARGS__); } while (0) |
| 31 | #else |
malc | d0f2c4c | 2010-02-07 02:03:50 +0300 | [diff] [blame] | 32 | #define DPRINTF(fmt, ...) \ |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 33 | do { } while (0) |
| 34 | #endif |
| 35 | |
Paolo Bonzini | e08c95c | 2012-10-03 14:05:49 +0200 | [diff] [blame] | 36 | static void unix_wait_for_connect(int fd, void *opaque) |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 37 | { |
Juan Quintela | 22f00a4 | 2010-05-11 15:56:35 +0200 | [diff] [blame] | 38 | MigrationState *s = opaque; |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 39 | |
Paolo Bonzini | e08c95c | 2012-10-03 14:05:49 +0200 | [diff] [blame] | 40 | if (fd < 0) { |
| 41 | DPRINTF("migrate connect error\n"); |
Paolo Bonzini | b352365 | 2013-02-22 17:36:47 +0100 | [diff] [blame] | 42 | s->file = NULL; |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 43 | migrate_fd_error(s); |
Paolo Bonzini | e08c95c | 2012-10-03 14:05:49 +0200 | [diff] [blame] | 44 | } else { |
| 45 | DPRINTF("migrate connect success\n"); |
Paolo Bonzini | b352365 | 2013-02-22 17:36:47 +0100 | [diff] [blame] | 46 | s->file = qemu_fopen_socket(fd, "wb"); |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 47 | migrate_fd_connect(s); |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 48 | } |
| 49 | } |
| 50 | |
Paolo Bonzini | f37afb5 | 2012-10-02 10:02:46 +0200 | [diff] [blame] | 51 | void unix_start_outgoing_migration(MigrationState *s, const char *path, Error **errp) |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 52 | { |
Paolo Bonzini | f8bbc12 | 2013-02-22 17:36:41 +0100 | [diff] [blame] | 53 | unix_nonblocking_connect(path, unix_wait_for_connect, s, errp); |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 54 | } |
| 55 | |
| 56 | static void unix_accept_incoming_migration(void *opaque) |
| 57 | { |
| 58 | struct sockaddr_un addr; |
| 59 | socklen_t addrlen = sizeof(addr); |
Stefan Weil | e0efb99 | 2011-02-23 19:09:16 +0100 | [diff] [blame] | 60 | int s = (intptr_t)opaque; |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 61 | QEMUFile *f; |
Dr. David Alan Gilbert | d99598c | 2014-03-19 13:34:28 +0000 | [diff] [blame] | 62 | int c, err; |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 63 | |
| 64 | do { |
Kevin Wolf | 40ff6d7 | 2009-12-02 12:24:42 +0100 | [diff] [blame] | 65 | c = qemu_accept(s, (struct sockaddr *)&addr, &addrlen); |
Dr. David Alan Gilbert | d99598c | 2014-03-19 13:34:28 +0000 | [diff] [blame] | 66 | err = errno; |
| 67 | } while (c < 0 && err == EINTR); |
Paolo Bonzini | a6ef290 | 2012-08-07 10:49:13 +0200 | [diff] [blame] | 68 | qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL); |
| 69 | close(s); |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 70 | |
malc | d0f2c4c | 2010-02-07 02:03:50 +0300 | [diff] [blame] | 71 | DPRINTF("accepted migration\n"); |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 72 | |
Dr. David Alan Gilbert | d99598c | 2014-03-19 13:34:28 +0000 | [diff] [blame] | 73 | if (c < 0) { |
| 74 | error_report("could not accept migration connection (%s)", |
| 75 | strerror(err)); |
| 76 | return; |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 77 | } |
| 78 | |
Paolo Bonzini | 0cc3f3c | 2013-02-22 17:36:39 +0100 | [diff] [blame] | 79 | f = qemu_fopen_socket(c, "rb"); |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 80 | if (f == NULL) { |
Dr. David Alan Gilbert | d99598c | 2014-03-19 13:34:28 +0000 | [diff] [blame] | 81 | error_report("could not qemu_fopen socket"); |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 82 | goto out; |
| 83 | } |
| 84 | |
Juan Quintela | 511c023 | 2010-06-09 14:10:55 +0200 | [diff] [blame] | 85 | process_incoming_migration(f); |
Paolo Bonzini | ab52a82 | 2012-08-07 10:50:26 +0200 | [diff] [blame] | 86 | return; |
| 87 | |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 88 | out: |
Juan Quintela | ee86c61 | 2011-02-23 20:44:29 +0100 | [diff] [blame] | 89 | close(c); |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 90 | } |
| 91 | |
Paolo Bonzini | 43eaae2 | 2012-10-02 18:21:18 +0200 | [diff] [blame] | 92 | void unix_start_incoming_migration(const char *path, Error **errp) |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 93 | { |
Juan Quintela | ee86c61 | 2011-02-23 20:44:29 +0100 | [diff] [blame] | 94 | int s; |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 95 | |
Paolo Bonzini | e08c95c | 2012-10-03 14:05:49 +0200 | [diff] [blame] | 96 | s = unix_listen(path, NULL, 0, errp); |
| 97 | if (s < 0) { |
Paolo Bonzini | 43eaae2 | 2012-10-02 18:21:18 +0200 | [diff] [blame] | 98 | return; |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 99 | } |
| 100 | |
Juan Quintela | ee86c61 | 2011-02-23 20:44:29 +0100 | [diff] [blame] | 101 | qemu_set_fd_handler2(s, NULL, unix_accept_incoming_migration, NULL, |
| 102 | (void *)(intptr_t)s); |
Chris Lalancette | 4951f65 | 2009-08-05 17:24:29 +0200 | [diff] [blame] | 103 | } |