aliguori | 065e281 | 2008-11-11 16:46:33 +0000 | [diff] [blame] | 1 | /* |
| 2 | * QEMU live migration |
| 3 | * |
| 4 | * Copyright IBM, Corp. 2008 |
| 5 | * Copyright Dell MessageOne 2008 |
| 6 | * |
| 7 | * Authors: |
| 8 | * Anthony Liguori <aliguori@us.ibm.com> |
| 9 | * Charles Duffy <charles_duffy@messageone.com> |
| 10 | * |
| 11 | * This work is licensed under the terms of the GNU GPL, version 2. See |
| 12 | * the COPYING file in the top-level directory. |
| 13 | * |
| 14 | */ |
| 15 | |
| 16 | #include "qemu-common.h" |
| 17 | #include "qemu_socket.h" |
| 18 | #include "migration.h" |
| 19 | #include "qemu-char.h" |
aliguori | 065e281 | 2008-11-11 16:46:33 +0000 | [diff] [blame] | 20 | #include "buffered_file.h" |
| 21 | #include "block.h" |
Blue Swirl | 0ffbba3 | 2010-06-04 20:01:07 +0000 | [diff] [blame] | 22 | #include <sys/types.h> |
| 23 | #include <sys/wait.h> |
aliguori | 065e281 | 2008-11-11 16:46:33 +0000 | [diff] [blame] | 24 | |
| 25 | //#define DEBUG_MIGRATION_EXEC |
| 26 | |
| 27 | #ifdef DEBUG_MIGRATION_EXEC |
malc | d0f2c4c | 2010-02-07 02:03:50 +0300 | [diff] [blame] | 28 | #define DPRINTF(fmt, ...) \ |
aliguori | 065e281 | 2008-11-11 16:46:33 +0000 | [diff] [blame] | 29 | do { printf("migration-exec: " fmt, ## __VA_ARGS__); } while (0) |
| 30 | #else |
malc | d0f2c4c | 2010-02-07 02:03:50 +0300 | [diff] [blame] | 31 | #define DPRINTF(fmt, ...) \ |
aliguori | 065e281 | 2008-11-11 16:46:33 +0000 | [diff] [blame] | 32 | do { } while (0) |
| 33 | #endif |
| 34 | |
Juan Quintela | 22f00a4 | 2010-05-11 15:56:35 +0200 | [diff] [blame] | 35 | static int file_errno(MigrationState *s) |
aliguori | 065e281 | 2008-11-11 16:46:33 +0000 | [diff] [blame] | 36 | { |
| 37 | return errno; |
| 38 | } |
| 39 | |
Juan Quintela | 22f00a4 | 2010-05-11 15:56:35 +0200 | [diff] [blame] | 40 | static int file_write(MigrationState *s, const void * buf, size_t size) |
aliguori | 065e281 | 2008-11-11 16:46:33 +0000 | [diff] [blame] | 41 | { |
| 42 | return write(s->fd, buf, size); |
| 43 | } |
| 44 | |
Juan Quintela | 22f00a4 | 2010-05-11 15:56:35 +0200 | [diff] [blame] | 45 | static int exec_close(MigrationState *s) |
aliguori | 065e281 | 2008-11-11 16:46:33 +0000 | [diff] [blame] | 46 | { |
Anthony Liguori | 41ef56e | 2010-06-02 14:55:25 -0500 | [diff] [blame] | 47 | int ret = 0; |
malc | d0f2c4c | 2010-02-07 02:03:50 +0300 | [diff] [blame] | 48 | DPRINTF("exec_close\n"); |
aliguori | 065e281 | 2008-11-11 16:46:33 +0000 | [diff] [blame] | 49 | if (s->opaque) { |
Anthony Liguori | 41ef56e | 2010-06-02 14:55:25 -0500 | [diff] [blame] | 50 | ret = qemu_fclose(s->opaque); |
aliguori | 065e281 | 2008-11-11 16:46:33 +0000 | [diff] [blame] | 51 | s->opaque = NULL; |
| 52 | s->fd = -1; |
Eduardo Habkost | e375fe3 | 2011-11-10 10:41:46 -0200 | [diff] [blame] | 53 | if (ret >= 0 && !(WIFEXITED(ret) && WEXITSTATUS(ret) == 0)) { |
| 54 | /* close succeeded, but non-zero exit code: */ |
| 55 | ret = -EIO; /* fake errno value */ |
Anthony Liguori | 41ef56e | 2010-06-02 14:55:25 -0500 | [diff] [blame] | 56 | } |
aliguori | 065e281 | 2008-11-11 16:46:33 +0000 | [diff] [blame] | 57 | } |
Anthony Liguori | 41ef56e | 2010-06-02 14:55:25 -0500 | [diff] [blame] | 58 | return ret; |
aliguori | 065e281 | 2008-11-11 16:46:33 +0000 | [diff] [blame] | 59 | } |
| 60 | |
Juan Quintela | 07af445 | 2010-05-11 22:27:45 +0200 | [diff] [blame] | 61 | int exec_start_outgoing_migration(MigrationState *s, const char *command) |
aliguori | 065e281 | 2008-11-11 16:46:33 +0000 | [diff] [blame] | 62 | { |
aliguori | 065e281 | 2008-11-11 16:46:33 +0000 | [diff] [blame] | 63 | FILE *f; |
| 64 | |
aliguori | 065e281 | 2008-11-11 16:46:33 +0000 | [diff] [blame] | 65 | f = popen(command, "w"); |
| 66 | if (f == NULL) { |
malc | d0f2c4c | 2010-02-07 02:03:50 +0300 | [diff] [blame] | 67 | DPRINTF("Unable to popen exec target\n"); |
Juan Quintela | 07af445 | 2010-05-11 22:27:45 +0200 | [diff] [blame] | 68 | goto err_after_popen; |
aliguori | 065e281 | 2008-11-11 16:46:33 +0000 | [diff] [blame] | 69 | } |
| 70 | |
| 71 | s->fd = fileno(f); |
| 72 | if (s->fd == -1) { |
malc | d0f2c4c | 2010-02-07 02:03:50 +0300 | [diff] [blame] | 73 | DPRINTF("Unable to retrieve file descriptor for popen'd handle\n"); |
aliguori | 065e281 | 2008-11-11 16:46:33 +0000 | [diff] [blame] | 74 | goto err_after_open; |
| 75 | } |
| 76 | |
Chris Lalancette | 9075000 | 2009-08-05 17:07:35 +0200 | [diff] [blame] | 77 | socket_set_nonblock(s->fd); |
aliguori | 065e281 | 2008-11-11 16:46:33 +0000 | [diff] [blame] | 78 | |
| 79 | s->opaque = qemu_popen(f, "w"); |
| 80 | |
aliguori | 8ad9fa5 | 2008-11-12 22:29:11 +0000 | [diff] [blame] | 81 | s->close = exec_close; |
aliguori | 065e281 | 2008-11-11 16:46:33 +0000 | [diff] [blame] | 82 | s->get_error = file_errno; |
| 83 | s->write = file_write; |
aliguori | 065e281 | 2008-11-11 16:46:33 +0000 | [diff] [blame] | 84 | |
| 85 | migrate_fd_connect(s); |
Juan Quintela | 07af445 | 2010-05-11 22:27:45 +0200 | [diff] [blame] | 86 | return 0; |
aliguori | 065e281 | 2008-11-11 16:46:33 +0000 | [diff] [blame] | 87 | |
| 88 | err_after_open: |
| 89 | pclose(f); |
Juan Quintela | 07af445 | 2010-05-11 22:27:45 +0200 | [diff] [blame] | 90 | err_after_popen: |
| 91 | return -1; |
aliguori | 065e281 | 2008-11-11 16:46:33 +0000 | [diff] [blame] | 92 | } |
| 93 | |
Chris Lalancette | 8a43b1e | 2009-05-25 16:38:23 +0200 | [diff] [blame] | 94 | static void exec_accept_incoming_migration(void *opaque) |
aliguori | 065e281 | 2008-11-11 16:46:33 +0000 | [diff] [blame] | 95 | { |
Chris Lalancette | 8a43b1e | 2009-05-25 16:38:23 +0200 | [diff] [blame] | 96 | QEMUFile *f = opaque; |
aliguori | 065e281 | 2008-11-11 16:46:33 +0000 | [diff] [blame] | 97 | |
Juan Quintela | 511c023 | 2010-06-09 14:10:55 +0200 | [diff] [blame] | 98 | process_incoming_migration(f); |
Juan Quintela | cfaf6d3 | 2010-03-10 00:10:35 +0100 | [diff] [blame] | 99 | qemu_set_fd_handler2(qemu_stdio_fd(f), NULL, NULL, NULL, NULL); |
aliguori | 065e281 | 2008-11-11 16:46:33 +0000 | [diff] [blame] | 100 | qemu_fclose(f); |
Chris Lalancette | 8a43b1e | 2009-05-25 16:38:23 +0200 | [diff] [blame] | 101 | } |
| 102 | |
| 103 | int exec_start_incoming_migration(const char *command) |
| 104 | { |
| 105 | QEMUFile *f; |
| 106 | |
malc | d0f2c4c | 2010-02-07 02:03:50 +0300 | [diff] [blame] | 107 | DPRINTF("Attempting to start an incoming migration\n"); |
Chris Lalancette | 8a43b1e | 2009-05-25 16:38:23 +0200 | [diff] [blame] | 108 | f = qemu_popen_cmd(command, "r"); |
| 109 | if(f == NULL) { |
malc | d0f2c4c | 2010-02-07 02:03:50 +0300 | [diff] [blame] | 110 | DPRINTF("Unable to apply qemu wrapper to popen file\n"); |
Chris Lalancette | 8a43b1e | 2009-05-25 16:38:23 +0200 | [diff] [blame] | 111 | return -errno; |
| 112 | } |
| 113 | |
Paolo Bonzini | 7f79dd2 | 2009-08-12 14:17:35 +0200 | [diff] [blame] | 114 | qemu_set_fd_handler2(qemu_stdio_fd(f), NULL, |
Juan Quintela | 1c39e2a | 2010-03-11 17:55:38 +0100 | [diff] [blame] | 115 | exec_accept_incoming_migration, NULL, f); |
Chris Lalancette | 8a43b1e | 2009-05-25 16:38:23 +0200 | [diff] [blame] | 116 | |
| 117 | return 0; |
aliguori | 065e281 | 2008-11-11 16:46:33 +0000 | [diff] [blame] | 118 | } |