Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 1 | /* |
| 2 | * QEMU live migration via generic fd |
| 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. |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 14 | */ |
| 15 | |
| 16 | #include "qemu-common.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 17 | #include "qemu/sockets.h" |
Paolo Bonzini | caf71f8 | 2012-12-17 18:19:50 +0100 | [diff] [blame] | 18 | #include "migration/migration.h" |
Paolo Bonzini | 83c9089 | 2012-12-17 18:19:49 +0100 | [diff] [blame] | 19 | #include "monitor/monitor.h" |
Juan Quintela | 557ec5a | 2012-10-03 14:07:31 +0200 | [diff] [blame] | 20 | #include "migration/qemu-file.h" |
Paolo Bonzini | 737e150 | 2012-12-17 18:19:44 +0100 | [diff] [blame] | 21 | #include "block/block.h" |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 22 | |
| 23 | //#define DEBUG_MIGRATION_FD |
| 24 | |
| 25 | #ifdef DEBUG_MIGRATION_FD |
malc | d0f2c4c | 2010-02-07 02:03:50 +0300 | [diff] [blame] | 26 | #define DPRINTF(fmt, ...) \ |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 27 | do { printf("migration-fd: " fmt, ## __VA_ARGS__); } while (0) |
| 28 | #else |
malc | d0f2c4c | 2010-02-07 02:03:50 +0300 | [diff] [blame] | 29 | #define DPRINTF(fmt, ...) \ |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +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 fd_errno(MigrationState *s) |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 34 | { |
| 35 | return errno; |
| 36 | } |
| 37 | |
Juan Quintela | 22f00a4 | 2010-05-11 15:56:35 +0200 | [diff] [blame] | 38 | static int fd_write(MigrationState *s, const void * buf, size_t size) |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +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 fd_close(MigrationState *s) |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 44 | { |
Gerd Hoffmann | aab2293 | 2011-10-27 09:12:04 +0200 | [diff] [blame] | 45 | struct stat st; |
| 46 | int ret; |
| 47 | |
malc | d0f2c4c | 2010-02-07 02:03:50 +0300 | [diff] [blame] | 48 | DPRINTF("fd_close\n"); |
Paolo Bonzini | 6c36013 | 2012-09-27 13:30:15 +0200 | [diff] [blame] | 49 | ret = fstat(s->fd, &st); |
| 50 | if (ret == 0 && S_ISREG(st.st_mode)) { |
| 51 | /* |
| 52 | * If the file handle is a regular file make sure the |
| 53 | * data is flushed to disk before signaling success. |
| 54 | */ |
| 55 | ret = fsync(s->fd); |
Gerd Hoffmann | aab2293 | 2011-10-27 09:12:04 +0200 | [diff] [blame] | 56 | if (ret != 0) { |
| 57 | ret = -errno; |
Paolo Bonzini | 6c36013 | 2012-09-27 13:30:15 +0200 | [diff] [blame] | 58 | perror("migration-fd: fsync"); |
Gerd Hoffmann | aab2293 | 2011-10-27 09:12:04 +0200 | [diff] [blame] | 59 | return ret; |
| 60 | } |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 61 | } |
Paolo Bonzini | 6c36013 | 2012-09-27 13:30:15 +0200 | [diff] [blame] | 62 | ret = close(s->fd); |
| 63 | s->fd = -1; |
| 64 | if (ret != 0) { |
| 65 | ret = -errno; |
| 66 | perror("migration-fd: close"); |
| 67 | } |
| 68 | return ret; |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 69 | } |
| 70 | |
Paolo Bonzini | f37afb5 | 2012-10-02 10:02:46 +0200 | [diff] [blame] | 71 | void fd_start_outgoing_migration(MigrationState *s, const char *fdname, Error **errp) |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 72 | { |
Paolo Bonzini | f37afb5 | 2012-10-02 10:02:46 +0200 | [diff] [blame] | 73 | s->fd = monitor_get_fd(cur_mon, fdname, errp); |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 74 | if (s->fd == -1) { |
Paolo Bonzini | f37afb5 | 2012-10-02 10:02:46 +0200 | [diff] [blame] | 75 | return; |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 76 | } |
| 77 | |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 78 | s->get_error = fd_errno; |
| 79 | s->write = fd_write; |
| 80 | s->close = fd_close; |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 81 | |
| 82 | migrate_fd_connect(s); |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 83 | } |
| 84 | |
| 85 | static void fd_accept_incoming_migration(void *opaque) |
| 86 | { |
| 87 | QEMUFile *f = opaque; |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 88 | |
Paolo Bonzini | d263a20 | 2012-08-08 10:21:26 +0200 | [diff] [blame] | 89 | qemu_set_fd_handler2(qemu_get_fd(f), NULL, NULL, NULL, NULL); |
Paolo Bonzini | a6ef290 | 2012-08-07 10:49:13 +0200 | [diff] [blame] | 90 | process_incoming_migration(f); |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 91 | } |
| 92 | |
Paolo Bonzini | 43eaae2 | 2012-10-02 18:21:18 +0200 | [diff] [blame] | 93 | void fd_start_incoming_migration(const char *infd, Error **errp) |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 94 | { |
| 95 | int fd; |
| 96 | QEMUFile *f; |
| 97 | |
malc | d0f2c4c | 2010-02-07 02:03:50 +0300 | [diff] [blame] | 98 | DPRINTF("Attempting to start an incoming migration via fd\n"); |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 99 | |
| 100 | fd = strtol(infd, NULL, 0); |
| 101 | f = qemu_fdopen(fd, "rb"); |
| 102 | if(f == NULL) { |
Paolo Bonzini | 43eaae2 | 2012-10-02 18:21:18 +0200 | [diff] [blame] | 103 | error_setg_errno(errp, errno, "failed to open the source descriptor"); |
| 104 | return; |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 105 | } |
| 106 | |
Juan Quintela | 1c39e2a | 2010-03-11 17:55:38 +0100 | [diff] [blame] | 107 | qemu_set_fd_handler2(fd, NULL, fd_accept_incoming_migration, NULL, f); |
Paolo Bonzini | 5ac1fad | 2009-08-18 15:56:25 +0200 | [diff] [blame] | 108 | } |