util/qemu-config.c

   1 #include "qemu/osdep.h"
   2 #include "qemu-common.h"
   3 #include "qemu/error-report.h"
   4 #include "qemu/option.h"
   5 #include "qemu/config-file.h"
   6 #include "qmp-commands.h"
   7
   8 static QemuOptsList *vm_config_groups[48];
   9 static QemuOptsList *drive_config_groups[5];
  10
  11 static QemuOptsList *find_list(QemuOptsList **lists, const char *group,
  12                                Error **errp)
  13 {
  14     int i;
  15
  16     for (i = 0; lists[i] != NULL; i++) {
  17         if (strcmp(lists[i]->name, group) == 0)
  18             break;
  19     }
  20     if (lists[i] == NULL) {
  21         error_setg(errp, "There is no option group '%s'", group);
  22     }
  23     return lists[i];
  24 }
  25
  26 QemuOptsList *qemu_find_opts(const char *group)
  27 {
  28     QemuOptsList *ret;
  29     Error *local_err = NULL;
  30
  31     ret = find_list(vm_config_groups, group, &local_err);
  32     if (local_err) {
  33         error_report_err(local_err);
  34     }
  35
  36     return ret;
  37 }
  38
  39 QemuOpts *qemu_find_opts_singleton(const char *group)
  40 {
  41     QemuOptsList *list;
  42     QemuOpts *opts;
  43
  44     list = qemu_find_opts(group);
  45     assert(list);
  46     opts = qemu_opts_find(list, NULL);
  47     if (!opts) {
  48         opts = qemu_opts_create(list, NULL, 0, &error_abort);
  49     }
  50     return opts;
  51 }
  52
  53 static CommandLineParameterInfoList *query_option_descs(const QemuOptDesc *desc)
  54 {
  55     CommandLineParameterInfoList *param_list = NULL, *entry;
  56     CommandLineParameterInfo *info;
  57     int i;
  58
  59     for (i = 0; desc[i].name != NULL; i++) {
  60         info = g_malloc0(sizeof(*info));
  61         info->name = g_strdup(desc[i].name);
  62
  63         switch (desc[i].type) {
  64         case QEMU_OPT_STRING:
  65             info->type = COMMAND_LINE_PARAMETER_TYPE_STRING;
  66             break;
  67         case QEMU_OPT_BOOL:
  68             info->type = COMMAND_LINE_PARAMETER_TYPE_BOOLEAN;
  69             break;
  70         case QEMU_OPT_NUMBER:
  71             info->type = COMMAND_LINE_PARAMETER_TYPE_NUMBER;
  72             break;
  73         case QEMU_OPT_SIZE:
  74             info->type = COMMAND_LINE_PARAMETER_TYPE_SIZE;
  75             break;
  76         }
  77
  78         if (desc[i].help) {
  79             info->has_help = true;
  80             info->help = g_strdup(desc[i].help);
  81         }
  82         if (desc[i].def_value_str) {
  83             info->has_q_default = true;
  84             info->q_default = g_strdup(desc[i].def_value_str);
  85         }
  86
  87         entry = g_malloc0(sizeof(*entry));
  88         entry->value = info;
  89         entry->next = param_list;
  90         param_list = entry;
  91     }
  92
  93     return param_list;
  94 }
  95
  96 /* remove repeated entry from the info list */
  97 static void cleanup_infolist(CommandLineParameterInfoList *head)
  98 {
  99     CommandLineParameterInfoList *pre_entry, *cur, *del_entry;
 100
 101     cur = head;
 102     while (cur->next) {
 103         pre_entry = head;
 104         while (pre_entry != cur->next) {
 105             if (!strcmp(pre_entry->value->name, cur->next->value->name)) {
 106                 del_entry = cur->next;
 107                 cur->next = cur->next->next;
 108                 g_free(del_entry);
 109                 break;
 110             }
 111             pre_entry = pre_entry->next;
 112         }
 113         cur = cur->next;
 114     }
 115 }
 116
 117 /* merge the description items of two parameter infolists */
 118 static void connect_infolist(CommandLineParameterInfoList *head,
 119                              CommandLineParameterInfoList *new)
 120 {
 121     CommandLineParameterInfoList *cur;
 122
 123     cur = head;
 124     while (cur->next) {
 125         cur = cur->next;
 126     }
 127     cur->next = new;
 128 }
 129
 130 /* access all the local QemuOptsLists for drive option */
 131 static CommandLineParameterInfoList *get_drive_infolist(void)
 132 {
 133     CommandLineParameterInfoList *head = NULL, *cur;
 134     int i;
 135
 136     for (i = 0; drive_config_groups[i] != NULL; i++) {
 137         if (!head) {
 138             head = query_option_descs(drive_config_groups[i]->desc);
 139         } else {
 140             cur = query_option_descs(drive_config_groups[i]->desc);
 141             connect_infolist(head, cur);
 142         }
 143     }
 144     cleanup_infolist(head);
 145
 146     return head;
 147 }
 148
 149 /* restore machine options that are now machine's properties */
 150 static QemuOptsList machine_opts = {
 151     .merge_lists = true,
 152     .head = QTAILQ_HEAD_INITIALIZER(machine_opts.head),
 153     .desc = {
 154         {
 155             .name = "type",
 156             .type = QEMU_OPT_STRING,
 157             .help = "emulated machine"
 158         },{
 159             .name = "accel",
 160             .type = QEMU_OPT_STRING,
 161             .help = "accelerator list",
 162         },{
 163             .name = "kernel_irqchip",
 164             .type = QEMU_OPT_BOOL,
 165             .help = "use KVM in-kernel irqchip",
 166         },{
 167             .name = "kvm_shadow_mem",
 168             .type = QEMU_OPT_SIZE,
 169             .help = "KVM shadow MMU size",
 170         },{
 171             .name = "kernel",
 172             .type = QEMU_OPT_STRING,
 173             .help = "Linux kernel image file",
 174         },{
 175             .name = "initrd",
 176             .type = QEMU_OPT_STRING,
 177             .help = "Linux initial ramdisk file",
 178         },{
 179             .name = "append",
 180             .type = QEMU_OPT_STRING,
 181             .help = "Linux kernel command line",
 182         },{
 183             .name = "dtb",
 184             .type = QEMU_OPT_STRING,
 185             .help = "Linux kernel device tree file",
 186         },{
 187             .name = "dumpdtb",
 188             .type = QEMU_OPT_STRING,
 189             .help = "Dump current dtb to a file and quit",
 190         },{
 191             .name = "phandle_start",
 192             .type = QEMU_OPT_NUMBER,
 193             .help = "The first phandle ID we may generate dynamically",
 194         },{
 195             .name = "dt_compatible",
 196             .type = QEMU_OPT_STRING,
 197             .help = "Overrides the \"compatible\" property of the dt root node",
 198         },{
 199             .name = "dump-guest-core",
 200             .type = QEMU_OPT_BOOL,
 201             .help = "Include guest memory in  a core dump",
 202         },{
 203             .name = "mem-merge",
 204             .type = QEMU_OPT_BOOL,
 205             .help = "enable/disable memory merge support",
 206         },{
 207             .name = "usb",
 208             .type = QEMU_OPT_BOOL,
 209             .help = "Set on/off to enable/disable usb",
 210         },{
 211             .name = "firmware",
 212             .type = QEMU_OPT_STRING,
 213             .help = "firmware image",
 214         },{
 215             .name = "iommu",
 216             .type = QEMU_OPT_BOOL,
 217             .help = "Set on/off to enable/disable Intel IOMMU (VT-d)",
 218         },{
 219             .name = "suppress-vmdesc",
 220             .type = QEMU_OPT_BOOL,
 221             .help = "Set on to disable self-describing migration",
 222         },{
 223             .name = "aes-key-wrap",
 224             .type = QEMU_OPT_BOOL,
 225             .help = "enable/disable AES key wrapping using the CPACF wrapping key",
 226         },{
 227             .name = "dea-key-wrap",
 228             .type = QEMU_OPT_BOOL,
 229             .help = "enable/disable DEA key wrapping using the CPACF wrapping key",
 230         },{
 231             .name = "loadparm",
 232             .type = QEMU_OPT_STRING,
 233             .help = "Up to 8 chars in set of [A-Za-z0-9. ](lower case chars"
 234                     " converted to upper case) to pass to machine"
 235                     " loader, boot manager, and guest kernel",
 236         },
 237         { /* End of list */ }
 238     }
 239 };
 240
 241 CommandLineOptionInfoList *qmp_query_command_line_options(bool has_option,
 242                                                           const char *option,
 243                                                           Error **errp)
 244 {
 245     CommandLineOptionInfoList *conf_list = NULL, *entry;
 246     CommandLineOptionInfo *info;
 247     int i;
 248
 249     for (i = 0; vm_config_groups[i] != NULL; i++) {
 250         if (!has_option || !strcmp(option, vm_config_groups[i]->name)) {
 251             info = g_malloc0(sizeof(*info));
 252             info->option = g_strdup(vm_config_groups[i]->name);
 253             if (!strcmp("drive", vm_config_groups[i]->name)) {
 254                 info->parameters = get_drive_infolist();
 255             } else if (!strcmp("machine", vm_config_groups[i]->name)) {
 256                 info->parameters = query_option_descs(machine_opts.desc);
 257             } else {
 258                 info->parameters =
 259                     query_option_descs(vm_config_groups[i]->desc);
 260             }
 261             entry = g_malloc0(sizeof(*entry));
 262             entry->value = info;
 263             entry->next = conf_list;
 264             conf_list = entry;
 265         }
 266     }
 267
 268     if (conf_list == NULL) {
 269         error_setg(errp, "invalid option name: %s", option);
 270     }
 271
 272     return conf_list;
 273 }
 274
 275 QemuOptsList *qemu_find_opts_err(const char *group, Error **errp)
 276 {
 277     return find_list(vm_config_groups, group, errp);
 278 }
 279
 280 void qemu_add_drive_opts(QemuOptsList *list)
 281 {
 282     int entries, i;
 283
 284     entries = ARRAY_SIZE(drive_config_groups);
 285     entries--; /* keep list NULL terminated */
 286     for (i = 0; i < entries; i++) {
 287         if (drive_config_groups[i] == NULL) {
 288             drive_config_groups[i] = list;
 289             return;
 290         }
 291     }
 292     fprintf(stderr, "ran out of space in drive_config_groups");
 293     abort();
 294 }
 295
 296 void qemu_add_opts(QemuOptsList *list)
 297 {
 298     int entries, i;
 299
 300     entries = ARRAY_SIZE(vm_config_groups);
 301     entries--; /* keep list NULL terminated */
 302     for (i = 0; i < entries; i++) {
 303         if (vm_config_groups[i] == NULL) {
 304             vm_config_groups[i] = list;
 305             return;
 306         }
 307     }
 308     fprintf(stderr, "ran out of space in vm_config_groups");
 309     abort();
 310 }
 311
 312 int qemu_set_option(const char *str)
 313 {
 314     Error *local_err = NULL;
 315     char group[64], id[64], arg[64];
 316     QemuOptsList *list;
 317     QemuOpts *opts;
 318     int rc, offset;
 319
 320     rc = sscanf(str, "%63[^.].%63[^.].%63[^=]%n", group, id, arg, &offset);
 321     if (rc < 3 || str[offset] != '=') {
 322         error_report("can't parse: \"%s\"", str);
 323         return -1;
 324     }
 325
 326     list = qemu_find_opts(group);
 327     if (list == NULL) {
 328         return -1;
 329     }
 330
 331     opts = qemu_opts_find(list, id);
 332     if (!opts) {
 333         error_report("there is no %s \"%s\" defined",
 334                      list->name, id);
 335         return -1;
 336     }
 337
 338     qemu_opt_set(opts, arg, str + offset + 1, &local_err);
 339     if (local_err) {
 340         error_report_err(local_err);
 341         return -1;
 342     }
 343     return 0;
 344 }
 345
 346 struct ConfigWriteData {
 347     QemuOptsList *list;
 348     FILE *fp;
 349 };
 350
 351 static int config_write_opt(void *opaque, const char *name, const char *value,
 352                             Error **errp)
 353 {
 354     struct ConfigWriteData *data = opaque;
 355
 356     fprintf(data->fp, "  %s = \"%s\"\n", name, value);
 357     return 0;
 358 }
 359
 360 static int config_write_opts(void *opaque, QemuOpts *opts, Error **errp)
 361 {
 362     struct ConfigWriteData *data = opaque;
 363     const char *id = qemu_opts_id(opts);
 364
 365     if (id) {
 366         fprintf(data->fp, "[%s \"%s\"]\n", data->list->name, id);
 367     } else {
 368         fprintf(data->fp, "[%s]\n", data->list->name);
 369     }
 370     qemu_opt_foreach(opts, config_write_opt, data, NULL);
 371     fprintf(data->fp, "\n");
 372     return 0;
 373 }
 374
 375 void qemu_config_write(FILE *fp)
 376 {
 377     struct ConfigWriteData data = { .fp = fp };
 378     QemuOptsList **lists = vm_config_groups;
 379     int i;
 380
 381     fprintf(fp, "# qemu config file\n\n");
 382     for (i = 0; lists[i] != NULL; i++) {
 383         data.list = lists[i];
 384         qemu_opts_foreach(data.list, config_write_opts, &data, NULL);
 385     }
 386 }
 387
 388 /* Returns number of config groups on success, -errno on error */
 389 int qemu_config_parse(FILE *fp, QemuOptsList **lists, const char *fname)
 390 {
 391     char line[1024], group[64], id[64], arg[64], value[1024];
 392     Location loc;
 393     QemuOptsList *list = NULL;
 394     Error *local_err = NULL;
 395     QemuOpts *opts = NULL;
 396     int res = -EINVAL, lno = 0;
 397     int count = 0;
 398
 399     loc_push_none(&loc);
 400     while (fgets(line, sizeof(line), fp) != NULL) {
 401         loc_set_file(fname, ++lno);
 402         if (line[0] == '\n') {
 403             /* skip empty lines */
 404             continue;
 405         }
 406         if (line[0] == '#') {
 407             /* comment */
 408             continue;
 409         }
 410         if (sscanf(line, "[%63s \"%63[^\"]\"]", group, id) == 2) {
 411             /* group with id */
 412             list = find_list(lists, group, &local_err);
 413             if (local_err) {
 414                 error_report_err(local_err);
 415                 goto out;
 416             }
 417             opts = qemu_opts_create(list, id, 1, NULL);
 418             count++;
 419             continue;
 420         }
 421         if (sscanf(line, "[%63[^]]]", group) == 1) {
 422             /* group without id */
 423             list = find_list(lists, group, &local_err);
 424             if (local_err) {
 425                 error_report_err(local_err);
 426                 goto out;
 427             }
 428             opts = qemu_opts_create(list, NULL, 0, &error_abort);
 429             count++;
 430             continue;
 431         }
 432         value[0] = '\0';
 433         if (sscanf(line, " %63s = \"%1023[^\"]\"", arg, value) == 2 ||
 434             sscanf(line, " %63s = \"\"", arg) == 1) {
 435             /* arg = value */
 436             if (opts == NULL) {
 437                 error_report("no group defined");
 438                 goto out;
 439             }
 440             qemu_opt_set(opts, arg, value, &local_err);
 441             if (local_err) {
 442                 error_report_err(local_err);
 443                 goto out;
 444             }
 445             continue;
 446         }
 447         error_report("parse error");
 448         goto out;
 449     }
 450     if (ferror(fp)) {
 451         error_report("error reading file");
 452         goto out;
 453     }
 454     res = count;
 455 out:
 456     loc_pop(&loc);
 457     return res;
 458 }
 459
 460 int qemu_read_config_file(const char *filename)
 461 {
 462     FILE *f = fopen(filename, "r");
 463     int ret;
 464
 465     if (f == NULL) {
 466         return -errno;
 467     }
 468
 469     ret = qemu_config_parse(f, vm_config_groups, filename);
 470     fclose(f);
 471     return ret;
 472 }
 473
 474 static void config_parse_qdict_section(QDict *options, QemuOptsList *opts,
 475                                        Error **errp)
 476 {
 477     QemuOpts *subopts;
 478     QDict *subqdict;
 479     QList *list = NULL;
 480     Error *local_err = NULL;
 481     size_t orig_size, enum_size;
 482     char *prefix;
 483
 484     prefix = g_strdup_printf("%s.", opts->name);
 485     qdict_extract_subqdict(options, &subqdict, prefix);
 486     g_free(prefix);
 487     orig_size = qdict_size(subqdict);
 488     if (!orig_size) {
 489         goto out;
 490     }
 491
 492     subopts = qemu_opts_create(opts, NULL, 0, &local_err);
 493     if (local_err) {
 494         error_propagate(errp, local_err);
 495         goto out;
 496     }
 497
 498     qemu_opts_absorb_qdict(subopts, subqdict, &local_err);
 499     if (local_err) {
 500         error_propagate(errp, local_err);
 501         goto out;
 502     }
 503
 504     enum_size = qdict_size(subqdict);
 505     if (enum_size < orig_size && enum_size) {
 506         error_setg(errp, "Unknown option '%s' for [%s]",
 507                    qdict_first(subqdict)->key, opts->name);
 508         goto out;
 509     }
 510
 511     if (enum_size) {
 512         /* Multiple, enumerated sections */
 513         QListEntry *list_entry;
 514         unsigned i = 0;
 515
 516         /* Not required anymore */
 517         qemu_opts_del(subopts);
 518
 519         qdict_array_split(subqdict, &list);
 520         if (qdict_size(subqdict)) {
 521             error_setg(errp, "Unused option '%s' for [%s]",
 522                        qdict_first(subqdict)->key, opts->name);
 523             goto out;
 524         }
 525
 526         QLIST_FOREACH_ENTRY(list, list_entry) {
 527             QDict *section = qobject_to_qdict(qlist_entry_obj(list_entry));
 528             char *opt_name;
 529
 530             if (!section) {
 531                 error_setg(errp, "[%s] section (index %u) does not consist of "
 532                            "keys", opts->name, i);
 533                 goto out;
 534             }
 535
 536             opt_name = g_strdup_printf("%s.%u", opts->name, i++);
 537             subopts = qemu_opts_create(opts, opt_name, 1, &local_err);
 538             g_free(opt_name);
 539             if (local_err) {
 540                 error_propagate(errp, local_err);
 541                 goto out;
 542             }
 543
 544             qemu_opts_absorb_qdict(subopts, section, &local_err);
 545             if (local_err) {
 546                 error_propagate(errp, local_err);
 547                 qemu_opts_del(subopts);
 548                 goto out;
 549             }
 550
 551             if (qdict_size(section)) {
 552                 error_setg(errp, "[%s] section doesn't support the option '%s'",
 553                            opts->name, qdict_first(section)->key);
 554                 qemu_opts_del(subopts);
 555                 goto out;
 556             }
 557         }
 558     }
 559
 560 out:
 561     QDECREF(subqdict);
 562     QDECREF(list);
 563 }
 564
 565 void qemu_config_parse_qdict(QDict *options, QemuOptsList **lists,
 566                              Error **errp)
 567 {
 568     int i;
 569     Error *local_err = NULL;
 570
 571     for (i = 0; lists[i]; i++) {
 572         config_parse_qdict_section(options, lists[i], &local_err);
 573         if (local_err) {
 574             error_propagate(errp, local_err);
 575             return;
 576         }
 577     }
 578 }