util/qemu-config.c

   1 #include "qemu-common.h"
   2 #include "qemu/error-report.h"
   3 #include "qemu/option.h"
   4 #include "qemu/config-file.h"
   5 #include "qapi/qmp/qerror.h"
   6 #include "hw/qdev.h"
   7 #include "qapi/error.h"
   8 #include "qmp-commands.h"
   9 #include "hw/i386/pc.h"
  10
  11 static QemuOptsList *vm_config_groups[32];
  12 static QemuOptsList *drive_config_groups[4];
  13
  14 static QemuOptsList *find_list(QemuOptsList **lists, const char *group,
  15                                Error **errp)
  16 {
  17     int i;
  18
  19     for (i = 0; lists[i] != NULL; i++) {
  20         if (strcmp(lists[i]->name, group) == 0)
  21             break;
  22     }
  23     if (lists[i] == NULL) {
  24         error_setg(errp, "There is no option group '%s'", group);
  25     }
  26     return lists[i];
  27 }
  28
  29 QemuOptsList *qemu_find_opts(const char *group)
  30 {
  31     QemuOptsList *ret;
  32     Error *local_err = NULL;
  33
  34     ret = find_list(vm_config_groups, group, &local_err);
  35     if (local_err) {
  36         error_report_err(local_err);
  37     }
  38
  39     return ret;
  40 }
  41
  42 QemuOpts *qemu_find_opts_singleton(const char *group)
  43 {
  44     QemuOptsList *list;
  45     QemuOpts *opts;
  46
  47     list = qemu_find_opts(group);
  48     assert(list);
  49     opts = qemu_opts_find(list, NULL);
  50     if (!opts) {
  51         opts = qemu_opts_create(list, NULL, 0, &error_abort);
  52     }
  53     return opts;
  54 }
  55
  56 static CommandLineParameterInfoList *query_option_descs(const QemuOptDesc *desc)
  57 {
  58     CommandLineParameterInfoList *param_list = NULL, *entry;
  59     CommandLineParameterInfo *info;
  60     int i;
  61
  62     for (i = 0; desc[i].name != NULL; i++) {
  63         info = g_malloc0(sizeof(*info));
  64         info->name = g_strdup(desc[i].name);
  65
  66         switch (desc[i].type) {
  67         case QEMU_OPT_STRING:
  68             info->type = COMMAND_LINE_PARAMETER_TYPE_STRING;
  69             break;
  70         case QEMU_OPT_BOOL:
  71             info->type = COMMAND_LINE_PARAMETER_TYPE_BOOLEAN;
  72             break;
  73         case QEMU_OPT_NUMBER:
  74             info->type = COMMAND_LINE_PARAMETER_TYPE_NUMBER;
  75             break;
  76         case QEMU_OPT_SIZE:
  77             info->type = COMMAND_LINE_PARAMETER_TYPE_SIZE;
  78             break;
  79         }
  80
  81         if (desc[i].help) {
  82             info->has_help = true;
  83             info->help = g_strdup(desc[i].help);
  84         }
  85         if (desc[i].def_value_str) {
  86             info->has_q_default = true;
  87             info->q_default = g_strdup(desc[i].def_value_str);
  88         }
  89
  90         entry = g_malloc0(sizeof(*entry));
  91         entry->value = info;
  92         entry->next = param_list;
  93         param_list = entry;
  94     }
  95
  96     return param_list;
  97 }
  98
  99 /* remove repeated entry from the info list */
 100 static void cleanup_infolist(CommandLineParameterInfoList *head)
 101 {
 102     CommandLineParameterInfoList *pre_entry, *cur, *del_entry;
 103
 104     cur = head;
 105     while (cur->next) {
 106         pre_entry = head;
 107         while (pre_entry != cur->next) {
 108             if (!strcmp(pre_entry->value->name, cur->next->value->name)) {
 109                 del_entry = cur->next;
 110                 cur->next = cur->next->next;
 111                 g_free(del_entry);
 112                 break;
 113             }
 114             pre_entry = pre_entry->next;
 115         }
 116         cur = cur->next;
 117     }
 118 }
 119
 120 /* merge the description items of two parameter infolists */
 121 static void connect_infolist(CommandLineParameterInfoList *head,
 122                              CommandLineParameterInfoList *new)
 123 {
 124     CommandLineParameterInfoList *cur;
 125
 126     cur = head;
 127     while (cur->next) {
 128         cur = cur->next;
 129     }
 130     cur->next = new;
 131 }
 132
 133 /* access all the local QemuOptsLists for drive option */
 134 static CommandLineParameterInfoList *get_drive_infolist(void)
 135 {
 136     CommandLineParameterInfoList *head = NULL, *cur;
 137     int i;
 138
 139     for (i = 0; drive_config_groups[i] != NULL; i++) {
 140         if (!head) {
 141             head = query_option_descs(drive_config_groups[i]->desc);
 142         } else {
 143             cur = query_option_descs(drive_config_groups[i]->desc);
 144             connect_infolist(head, cur);
 145         }
 146     }
 147     cleanup_infolist(head);
 148
 149     return head;
 150 }
 151
 152 /* restore machine options that are now machine's properties */
 153 static QemuOptsList machine_opts = {
 154     .merge_lists = true,
 155     .head = QTAILQ_HEAD_INITIALIZER(machine_opts.head),
 156     .desc = {
 157         {
 158             .name = "type",
 159             .type = QEMU_OPT_STRING,
 160             .help = "emulated machine"
 161         },{
 162             .name = "accel",
 163             .type = QEMU_OPT_STRING,
 164             .help = "accelerator list",
 165         },{
 166             .name = "kernel_irqchip",
 167             .type = QEMU_OPT_BOOL,
 168             .help = "use KVM in-kernel irqchip",
 169         },{
 170             .name = "kvm_shadow_mem",
 171             .type = QEMU_OPT_SIZE,
 172             .help = "KVM shadow MMU size",
 173         },{
 174             .name = "kernel",
 175             .type = QEMU_OPT_STRING,
 176             .help = "Linux kernel image file",
 177         },{
 178             .name = "initrd",
 179             .type = QEMU_OPT_STRING,
 180             .help = "Linux initial ramdisk file",
 181         },{
 182             .name = "append",
 183             .type = QEMU_OPT_STRING,
 184             .help = "Linux kernel command line",
 185         },{
 186             .name = "dtb",
 187             .type = QEMU_OPT_STRING,
 188             .help = "Linux kernel device tree file",
 189         },{
 190             .name = "dumpdtb",
 191             .type = QEMU_OPT_STRING,
 192             .help = "Dump current dtb to a file and quit",
 193         },{
 194             .name = "phandle_start",
 195             .type = QEMU_OPT_NUMBER,
 196             .help = "The first phandle ID we may generate dynamically",
 197         },{
 198             .name = "dt_compatible",
 199             .type = QEMU_OPT_STRING,
 200             .help = "Overrides the \"compatible\" property of the dt root node",
 201         },{
 202             .name = "dump-guest-core",
 203             .type = QEMU_OPT_BOOL,
 204             .help = "Include guest memory in  a core dump",
 205         },{
 206             .name = "mem-merge",
 207             .type = QEMU_OPT_BOOL,
 208             .help = "enable/disable memory merge support",
 209         },{
 210             .name = "usb",
 211             .type = QEMU_OPT_BOOL,
 212             .help = "Set on/off to enable/disable usb",
 213         },{
 214             .name = "firmware",
 215             .type = QEMU_OPT_STRING,
 216             .help = "firmware image",
 217         },{
 218             .name = "iommu",
 219             .type = QEMU_OPT_BOOL,
 220             .help = "Set on/off to enable/disable Intel IOMMU (VT-d)",
 221         },{
 222             .name = "suppress-vmdesc",
 223             .type = QEMU_OPT_BOOL,
 224             .help = "Set on to disable self-describing migration",
 225         },
 226         { /* End of list */ }
 227     }
 228 };
 229
 230 CommandLineOptionInfoList *qmp_query_command_line_options(bool has_option,
 231                                                           const char *option,
 232                                                           Error **errp)
 233 {
 234     CommandLineOptionInfoList *conf_list = NULL, *entry;
 235     CommandLineOptionInfo *info;
 236     int i;
 237
 238     for (i = 0; vm_config_groups[i] != NULL; i++) {
 239         if (!has_option || !strcmp(option, vm_config_groups[i]->name)) {
 240             info = g_malloc0(sizeof(*info));
 241             info->option = g_strdup(vm_config_groups[i]->name);
 242             if (!strcmp("drive", vm_config_groups[i]->name)) {
 243                 info->parameters = get_drive_infolist();
 244             } else if (!strcmp("machine", vm_config_groups[i]->name)) {
 245                 info->parameters = query_option_descs(machine_opts.desc);
 246             } else {
 247                 info->parameters =
 248                     query_option_descs(vm_config_groups[i]->desc);
 249             }
 250             entry = g_malloc0(sizeof(*entry));
 251             entry->value = info;
 252             entry->next = conf_list;
 253             conf_list = entry;
 254         }
 255     }
 256
 257     if (conf_list == NULL) {
 258         error_setg(errp, "invalid option name: %s", option);
 259     }
 260
 261     return conf_list;
 262 }
 263
 264 QemuOptsList *qemu_find_opts_err(const char *group, Error **errp)
 265 {
 266     return find_list(vm_config_groups, group, errp);
 267 }
 268
 269 void qemu_add_drive_opts(QemuOptsList *list)
 270 {
 271     int entries, i;
 272
 273     entries = ARRAY_SIZE(drive_config_groups);
 274     entries--; /* keep list NULL terminated */
 275     for (i = 0; i < entries; i++) {
 276         if (drive_config_groups[i] == NULL) {
 277             drive_config_groups[i] = list;
 278             return;
 279         }
 280     }
 281     fprintf(stderr, "ran out of space in drive_config_groups");
 282     abort();
 283 }
 284
 285 void qemu_add_opts(QemuOptsList *list)
 286 {
 287     int entries, i;
 288
 289     entries = ARRAY_SIZE(vm_config_groups);
 290     entries--; /* keep list NULL terminated */
 291     for (i = 0; i < entries; i++) {
 292         if (vm_config_groups[i] == NULL) {
 293             vm_config_groups[i] = list;
 294             return;
 295         }
 296     }
 297     fprintf(stderr, "ran out of space in vm_config_groups");
 298     abort();
 299 }
 300
 301 int qemu_set_option(const char *str)
 302 {
 303     Error *local_err = NULL;
 304     char group[64], id[64], arg[64];
 305     QemuOptsList *list;
 306     QemuOpts *opts;
 307     int rc, offset;
 308
 309     rc = sscanf(str, "%63[^.].%63[^.].%63[^=]%n", group, id, arg, &offset);
 310     if (rc < 3 || str[offset] != '=') {
 311         error_report("can't parse: \"%s\"", str);
 312         return -1;
 313     }
 314
 315     list = qemu_find_opts(group);
 316     if (list == NULL) {
 317         return -1;
 318     }
 319
 320     opts = qemu_opts_find(list, id);
 321     if (!opts) {
 322         error_report("there is no %s \"%s\" defined",
 323                      list->name, id);
 324         return -1;
 325     }
 326
 327     qemu_opt_set(opts, arg, str + offset + 1, &local_err);
 328     if (local_err) {
 329         error_report_err(local_err);
 330         return -1;
 331     }
 332     return 0;
 333 }
 334
 335 struct ConfigWriteData {
 336     QemuOptsList *list;
 337     FILE *fp;
 338 };
 339
 340 static int config_write_opt(const char *name, const char *value, void *opaque)
 341 {
 342     struct ConfigWriteData *data = opaque;
 343
 344     fprintf(data->fp, "  %s = \"%s\"\n", name, value);
 345     return 0;
 346 }
 347
 348 static int config_write_opts(QemuOpts *opts, void *opaque)
 349 {
 350     struct ConfigWriteData *data = opaque;
 351     const char *id = qemu_opts_id(opts);
 352
 353     if (id) {
 354         fprintf(data->fp, "[%s \"%s\"]\n", data->list->name, id);
 355     } else {
 356         fprintf(data->fp, "[%s]\n", data->list->name);
 357     }
 358     qemu_opt_foreach(opts, config_write_opt, data, 0);
 359     fprintf(data->fp, "\n");
 360     return 0;
 361 }
 362
 363 void qemu_config_write(FILE *fp)
 364 {
 365     struct ConfigWriteData data = { .fp = fp };
 366     QemuOptsList **lists = vm_config_groups;
 367     int i;
 368
 369     fprintf(fp, "# qemu config file\n\n");
 370     for (i = 0; lists[i] != NULL; i++) {
 371         data.list = lists[i];
 372         qemu_opts_foreach(data.list, config_write_opts, &data, 0);
 373     }
 374 }
 375
 376 int qemu_config_parse(FILE *fp, QemuOptsList **lists, const char *fname)
 377 {
 378     char line[1024], group[64], id[64], arg[64], value[1024];
 379     Location loc;
 380     QemuOptsList *list = NULL;
 381     Error *local_err = NULL;
 382     QemuOpts *opts = NULL;
 383     int res = -1, lno = 0;
 384
 385     loc_push_none(&loc);
 386     while (fgets(line, sizeof(line), fp) != NULL) {
 387         loc_set_file(fname, ++lno);
 388         if (line[0] == '\n') {
 389             /* skip empty lines */
 390             continue;
 391         }
 392         if (line[0] == '#') {
 393             /* comment */
 394             continue;
 395         }
 396         if (sscanf(line, "[%63s \"%63[^\"]\"]", group, id) == 2) {
 397             /* group with id */
 398             list = find_list(lists, group, &local_err);
 399             if (local_err) {
 400                 error_report_err(local_err);
 401                 goto out;
 402             }
 403             opts = qemu_opts_create(list, id, 1, NULL);
 404             continue;
 405         }
 406         if (sscanf(line, "[%63[^]]]", group) == 1) {
 407             /* group without id */
 408             list = find_list(lists, group, &local_err);
 409             if (local_err) {
 410                 error_report_err(local_err);
 411                 goto out;
 412             }
 413             opts = qemu_opts_create(list, NULL, 0, &error_abort);
 414             continue;
 415         }
 416         if (sscanf(line, " %63s = \"%1023[^\"]\"", arg, value) == 2) {
 417             /* arg = value */
 418             if (opts == NULL) {
 419                 error_report("no group defined");
 420                 goto out;
 421             }
 422             qemu_opt_set(opts, arg, value, &local_err);
 423             if (local_err) {
 424                 error_report_err(local_err);
 425                 goto out;
 426             }
 427             continue;
 428         }
 429         error_report("parse error");
 430         goto out;
 431     }
 432     if (ferror(fp)) {
 433         error_report("error reading file");
 434         goto out;
 435     }
 436     res = 0;
 437 out:
 438     loc_pop(&loc);
 439     return res;
 440 }
 441
 442 int qemu_read_config_file(const char *filename)
 443 {
 444     FILE *f = fopen(filename, "r");
 445     int ret;
 446
 447     if (f == NULL) {
 448         return -errno;
 449     }
 450
 451     ret = qemu_config_parse(f, vm_config_groups, filename);
 452     fclose(f);
 453
 454     if (ret == 0) {
 455         return 0;
 456     } else {
 457         return -EINVAL;
 458     }
 459 }
 460
 461 static void config_parse_qdict_section(QDict *options, QemuOptsList *opts,
 462                                        Error **errp)
 463 {
 464     QemuOpts *subopts;
 465     QDict *subqdict;
 466     QList *list = NULL;
 467     Error *local_err = NULL;
 468     size_t orig_size, enum_size;
 469     char *prefix;
 470
 471     prefix = g_strdup_printf("%s.", opts->name);
 472     qdict_extract_subqdict(options, &subqdict, prefix);
 473     g_free(prefix);
 474     orig_size = qdict_size(subqdict);
 475     if (!orig_size) {
 476         goto out;
 477     }
 478
 479     subopts = qemu_opts_create(opts, NULL, 0, &local_err);
 480     if (local_err) {
 481         error_propagate(errp, local_err);
 482         goto out;
 483     }
 484
 485     qemu_opts_absorb_qdict(subopts, subqdict, &local_err);
 486     if (local_err) {
 487         error_propagate(errp, local_err);
 488         goto out;
 489     }
 490
 491     enum_size = qdict_size(subqdict);
 492     if (enum_size < orig_size && enum_size) {
 493         error_setg(errp, "Unknown option '%s' for [%s]",
 494                    qdict_first(subqdict)->key, opts->name);
 495         goto out;
 496     }
 497
 498     if (enum_size) {
 499         /* Multiple, enumerated sections */
 500         QListEntry *list_entry;
 501         unsigned i = 0;
 502
 503         /* Not required anymore */
 504         qemu_opts_del(subopts);
 505
 506         qdict_array_split(subqdict, &list);
 507         if (qdict_size(subqdict)) {
 508             error_setg(errp, "Unused option '%s' for [%s]",
 509                        qdict_first(subqdict)->key, opts->name);
 510             goto out;
 511         }
 512
 513         QLIST_FOREACH_ENTRY(list, list_entry) {
 514             QDict *section = qobject_to_qdict(qlist_entry_obj(list_entry));
 515             char *opt_name;
 516
 517             if (!section) {
 518                 error_setg(errp, "[%s] section (index %u) does not consist of "
 519                            "keys", opts->name, i);
 520                 goto out;
 521             }
 522
 523             opt_name = g_strdup_printf("%s.%u", opts->name, i++);
 524             subopts = qemu_opts_create(opts, opt_name, 1, &local_err);
 525             g_free(opt_name);
 526             if (local_err) {
 527                 error_propagate(errp, local_err);
 528                 goto out;
 529             }
 530
 531             qemu_opts_absorb_qdict(subopts, section, &local_err);
 532             if (local_err) {
 533                 error_propagate(errp, local_err);
 534                 qemu_opts_del(subopts);
 535                 goto out;
 536             }
 537
 538             if (qdict_size(section)) {
 539                 error_setg(errp, "[%s] section doesn't support the option '%s'",
 540                            opts->name, qdict_first(section)->key);
 541                 qemu_opts_del(subopts);
 542                 goto out;
 543             }
 544         }
 545     }
 546
 547 out:
 548     QDECREF(subqdict);
 549     QDECREF(list);
 550 }
 551
 552 void qemu_config_parse_qdict(QDict *options, QemuOptsList **lists,
 553                              Error **errp)
 554 {
 555     int i;
 556     Error *local_err = NULL;
 557
 558     for (i = 0; lists[i]; i++) {
 559         config_parse_qdict_section(options, lists[i], &local_err);
 560         if (local_err) {
 561             error_propagate(errp, local_err);
 562             return;
 563         }
 564     }
 565 }