David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [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" |
| 20 | #include "sysemu.h" |
| 21 | #include "buffered_file.h" |
| 22 | #include "block.h" |
David 'Digit' Turner | 986acc9 | 2011-05-10 16:50:01 +0200 | [diff] [blame] | 23 | #include <sys/types.h> |
| 24 | #include <sys/wait.h> |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 25 | |
| 26 | //#define DEBUG_MIGRATION_EXEC |
| 27 | |
| 28 | #ifdef DEBUG_MIGRATION_EXEC |
David 'Digit' Turner | 986acc9 | 2011-05-10 16:50:01 +0200 | [diff] [blame] | 29 | #define DPRINTF(fmt, ...) \ |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 30 | do { printf("migration-exec: " fmt, ## __VA_ARGS__); } while (0) |
| 31 | #else |
David 'Digit' Turner | 986acc9 | 2011-05-10 16:50:01 +0200 | [diff] [blame] | 32 | #define DPRINTF(fmt, ...) \ |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 33 | do { } while (0) |
| 34 | #endif |
| 35 | |
| 36 | static int file_errno(FdMigrationState *s) |
| 37 | { |
| 38 | return errno; |
| 39 | } |
| 40 | |
| 41 | static int file_write(FdMigrationState *s, const void * buf, size_t size) |
| 42 | { |
| 43 | return write(s->fd, buf, size); |
| 44 | } |
| 45 | |
| 46 | static int exec_close(FdMigrationState *s) |
| 47 | { |
David 'Digit' Turner | 986acc9 | 2011-05-10 16:50:01 +0200 | [diff] [blame] | 48 | int ret = 0; |
| 49 | DPRINTF("exec_close\n"); |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 50 | if (s->opaque) { |
David 'Digit' Turner | 986acc9 | 2011-05-10 16:50:01 +0200 | [diff] [blame] | 51 | ret = qemu_fclose(s->opaque); |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 52 | s->opaque = NULL; |
| 53 | s->fd = -1; |
David 'Digit' Turner | 986acc9 | 2011-05-10 16:50:01 +0200 | [diff] [blame] | 54 | if (ret != -1 && |
| 55 | WIFEXITED(ret) |
| 56 | && WEXITSTATUS(ret) == 0) { |
| 57 | ret = 0; |
| 58 | } else { |
| 59 | ret = -1; |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 60 | } |
David 'Digit' Turner | 986acc9 | 2011-05-10 16:50:01 +0200 | [diff] [blame] | 61 | } |
| 62 | return ret; |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 63 | } |
| 64 | |
| 65 | MigrationState *exec_start_outgoing_migration(const char *command, |
| 66 | int64_t bandwidth_limit, |
| 67 | int detach) |
| 68 | { |
| 69 | FdMigrationState *s; |
| 70 | FILE *f; |
| 71 | |
| 72 | s = qemu_mallocz(sizeof(*s)); |
| 73 | |
| 74 | f = popen(command, "w"); |
| 75 | if (f == NULL) { |
David 'Digit' Turner | 986acc9 | 2011-05-10 16:50:01 +0200 | [diff] [blame] | 76 | DPRINTF("Unable to popen exec target\n"); |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 77 | goto err_after_alloc; |
| 78 | } |
| 79 | |
| 80 | s->fd = fileno(f); |
| 81 | if (s->fd == -1) { |
David 'Digit' Turner | 986acc9 | 2011-05-10 16:50:01 +0200 | [diff] [blame] | 82 | DPRINTF("Unable to retrieve file descriptor for popen'd handle\n"); |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 83 | goto err_after_open; |
| 84 | } |
| 85 | |
| 86 | if (fcntl(s->fd, F_SETFD, O_NONBLOCK) == -1) { |
David 'Digit' Turner | 986acc9 | 2011-05-10 16:50:01 +0200 | [diff] [blame] | 87 | DPRINTF("Unable to set nonblocking mode on file descriptor\n"); |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 88 | goto err_after_open; |
| 89 | } |
| 90 | |
| 91 | s->opaque = qemu_popen(f, "w"); |
| 92 | |
| 93 | s->close = exec_close; |
| 94 | s->get_error = file_errno; |
| 95 | s->write = file_write; |
| 96 | s->mig_state.cancel = migrate_fd_cancel; |
| 97 | s->mig_state.get_status = migrate_fd_get_status; |
| 98 | s->mig_state.release = migrate_fd_release; |
| 99 | |
| 100 | s->state = MIG_STATE_ACTIVE; |
| 101 | s->mon_resume = NULL; |
| 102 | s->bandwidth_limit = bandwidth_limit; |
| 103 | |
| 104 | if (!detach) |
| 105 | migrate_fd_monitor_suspend(s); |
| 106 | |
| 107 | migrate_fd_connect(s); |
| 108 | return &s->mig_state; |
| 109 | |
| 110 | err_after_open: |
| 111 | pclose(f); |
| 112 | err_after_alloc: |
| 113 | qemu_free(s); |
| 114 | return NULL; |
| 115 | } |
| 116 | |
| 117 | static void exec_accept_incoming_migration(void *opaque) |
| 118 | { |
| 119 | QEMUFile *f = opaque; |
| 120 | int ret; |
| 121 | |
| 122 | vm_stop(0); /* just in case */ |
| 123 | ret = qemu_loadvm_state(f); |
| 124 | if (ret < 0) { |
| 125 | fprintf(stderr, "load of migration failed\n"); |
| 126 | goto err; |
| 127 | } |
| 128 | qemu_announce_self(); |
David 'Digit' Turner | 986acc9 | 2011-05-10 16:50:01 +0200 | [diff] [blame] | 129 | DPRINTF("successfully loaded vm state\n"); |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 130 | /* we've successfully migrated, close the fd */ |
David 'Digit' Turner | 986acc9 | 2011-05-10 16:50:01 +0200 | [diff] [blame] | 131 | qemu_set_fd_handler2(qemu_stdio_fd(f), NULL, NULL, NULL, NULL); |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 132 | vm_start(); |
| 133 | |
| 134 | err: |
| 135 | qemu_fclose(f); |
| 136 | } |
| 137 | |
| 138 | int exec_start_incoming_migration(const char *command) |
| 139 | { |
| 140 | QEMUFile *f; |
| 141 | |
David 'Digit' Turner | 986acc9 | 2011-05-10 16:50:01 +0200 | [diff] [blame] | 142 | DPRINTF("Attempting to start an incoming migration\n"); |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 143 | f = qemu_popen_cmd(command, "r"); |
| 144 | if(f == NULL) { |
David 'Digit' Turner | 986acc9 | 2011-05-10 16:50:01 +0200 | [diff] [blame] | 145 | DPRINTF("Unable to apply qemu wrapper to popen file\n"); |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 146 | return -errno; |
| 147 | } |
| 148 | |
David 'Digit' Turner | 986acc9 | 2011-05-10 16:50:01 +0200 | [diff] [blame] | 149 | qemu_set_fd_handler2(qemu_stdio_fd(f), NULL, |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 150 | exec_accept_incoming_migration, NULL, |
| 151 | (void *)(unsigned long)f); |
| 152 | |
| 153 | return 0; |
| 154 | } |