util/qemu-config.c

   1 #include "qemu/osdep.h"
   2 #include "block/qdict.h" /* for qdict_extract_subqdict() */
   3 #include "qapi/error.h"
   4 #include "qapi/qapi-commands-misc.h"
   5 #include "qapi/qmp/qerror.h"
   6 #include "qapi/qmp/qdict.h"
   7 #include "qapi/qmp/qlist.h"
   8 #include "qemu/error-report.h"
   9 #include "qemu/option.h"
  10 #include "qemu/config-file.h"
  11
  12 static QemuOptsList *vm_config_groups[48];
  13 static QemuOptsList *drive_config_groups[5];
  14
  15 static QemuOptsList *find_list(QemuOptsList **lists, const char *group,
  16                                Error **errp)
  17 {
  18     int i;
  19
  20     qemu_load_module_for_opts(group);
  21     for (i = 0; lists[i] != NULL; i++) {
  22         if (strcmp(lists[i]->name, group) == 0)
  23             break;
  24     }
  25     if (lists[i] == NULL) {
  26         error_setg(errp, "There is no option group '%s'", group);
  27     }
  28     return lists[i];
  29 }
  30
  31 QemuOptsList *qemu_find_opts(const char *group)
  32 {
  33     QemuOptsList *ret;
  34     Error *local_err = NULL;
  35
  36     ret = find_list(vm_config_groups, group, &local_err);
  37     if (local_err) {
  38         error_report_err(local_err);
  39     }
  40
  41     return ret;
  42 }
  43
  44 QemuOpts *qemu_find_opts_singleton(const char *group)
  45 {
  46     QemuOptsList *list;
  47     QemuOpts *opts;
  48
  49     list = qemu_find_opts(group);
  50     assert(list);
  51     opts = qemu_opts_find(list, NULL);
  52     if (!opts) {
  53         opts = qemu_opts_create(list, NULL, 0, &error_abort);
  54     }
  55     return opts;
  56 }
  57
  58 static CommandLineParameterInfoList *query_option_descs(const QemuOptDesc *desc)
  59 {
  60     CommandLineParameterInfoList *param_list = NULL;
  61     CommandLineParameterInfo *info;
  62     int i;
  63
  64     for (i = 0; desc[i].name != NULL; i++) {
  65         info = g_malloc0(sizeof(*info));
  66         info->name = g_strdup(desc[i].name);
  67
  68         switch (desc[i].type) {
  69         case QEMU_OPT_STRING:
  70             info->type = COMMAND_LINE_PARAMETER_TYPE_STRING;
  71             break;
  72         case QEMU_OPT_BOOL:
  73             info->type = COMMAND_LINE_PARAMETER_TYPE_BOOLEAN;
  74             break;
  75         case QEMU_OPT_NUMBER:
  76             info->type = COMMAND_LINE_PARAMETER_TYPE_NUMBER;
  77             break;
  78         case QEMU_OPT_SIZE:
  79             info->type = COMMAND_LINE_PARAMETER_TYPE_SIZE;
  80             break;
  81         }
  82
  83         if (desc[i].help) {
  84             info->has_help = true;
  85             info->help = g_strdup(desc[i].help);
  86         }
  87         if (desc[i].def_value_str) {
  88             info->has_q_default = true;
  89             info->q_default = g_strdup(desc[i].def_value_str);
  90         }
  91
  92         QAPI_LIST_PREPEND(param_list, info);
  93     }
  94
  95     return param_list;
  96 }
  97
  98 /* remove repeated entry from the info list */
  99 static void cleanup_infolist(CommandLineParameterInfoList *head)
 100 {
 101     CommandLineParameterInfoList *pre_entry, *cur, *del_entry;
 102
 103     cur = head;
 104     while (cur->next) {
 105         pre_entry = head;
 106         while (pre_entry != cur->next) {
 107             if (!strcmp(pre_entry->value->name, cur->next->value->name)) {
 108                 del_entry = cur->next;
 109                 cur->next = cur->next->next;
 110                 del_entry->next = NULL;
 111                 qapi_free_CommandLineParameterInfoList(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             .name = "aes-key-wrap",
 227             .type = QEMU_OPT_BOOL,
 228             .help = "enable/disable AES key wrapping using the CPACF wrapping key",
 229         },{
 230             .name = "dea-key-wrap",
 231             .type = QEMU_OPT_BOOL,
 232             .help = "enable/disable DEA key wrapping using the CPACF wrapping key",
 233         },{
 234             .name = "loadparm",
 235             .type = QEMU_OPT_STRING,
 236             .help = "Up to 8 chars in set of [A-Za-z0-9. ](lower case chars"
 237                     " converted to upper case) to pass to machine"
 238                     " loader, boot manager, and guest kernel",
 239         },
 240         { /* End of list */ }
 241     }
 242 };
 243
 244 CommandLineOptionInfoList *qmp_query_command_line_options(bool has_option,
 245                                                           const char *option,
 246                                                           Error **errp)
 247 {
 248     CommandLineOptionInfoList *conf_list = NULL;
 249     CommandLineOptionInfo *info;
 250     int i;
 251
 252     for (i = 0; vm_config_groups[i] != NULL; i++) {
 253         if (!has_option || !strcmp(option, vm_config_groups[i]->name)) {
 254             info = g_malloc0(sizeof(*info));
 255             info->option = g_strdup(vm_config_groups[i]->name);
 256             if (!strcmp("drive", vm_config_groups[i]->name)) {
 257                 info->parameters = get_drive_infolist();
 258             } else if (!strcmp("machine", vm_config_groups[i]->name)) {
 259                 info->parameters = query_option_descs(machine_opts.desc);
 260             } else {
 261                 info->parameters =
 262                     query_option_descs(vm_config_groups[i]->desc);
 263             }
 264             QAPI_LIST_PREPEND(conf_list, info);
 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 struct ConfigWriteData {
 313     QemuOptsList *list;
 314     FILE *fp;
 315 };
 316
 317 static int config_write_opt(void *opaque, const char *name, const char *value,
 318                             Error **errp)
 319 {
 320     struct ConfigWriteData *data = opaque;
 321
 322     fprintf(data->fp, "  %s = \"%s\"\n", name, value);
 323     return 0;
 324 }
 325
 326 static int config_write_opts(void *opaque, QemuOpts *opts, Error **errp)
 327 {
 328     struct ConfigWriteData *data = opaque;
 329     const char *id = qemu_opts_id(opts);
 330
 331     if (id) {
 332         fprintf(data->fp, "[%s \"%s\"]\n", data->list->name, id);
 333     } else {
 334         fprintf(data->fp, "[%s]\n", data->list->name);
 335     }
 336     qemu_opt_foreach(opts, config_write_opt, data, NULL);
 337     fprintf(data->fp, "\n");
 338     return 0;
 339 }
 340
 341 void qemu_config_write(FILE *fp)
 342 {
 343     struct ConfigWriteData data = { .fp = fp };
 344     QemuOptsList **lists = vm_config_groups;
 345     int i;
 346
 347     fprintf(fp, "# qemu config file\n\n");
 348     for (i = 0; lists[i] != NULL; i++) {
 349         data.list = lists[i];
 350         qemu_opts_foreach(data.list, config_write_opts, &data, NULL);
 351     }
 352 }
 353
 354 /* Returns number of config groups on success, -errno on error */
 355 static int qemu_config_foreach(FILE *fp, QEMUConfigCB *cb, void *opaque,
 356                                const char *fname, Error **errp)
 357 {
 358     char line[1024], prev_group[64], group[64], arg[64], value[1024];
 359     Location loc;
 360     Error *local_err = NULL;
 361     QDict *qdict = NULL;
 362     int res = -EINVAL, lno = 0;
 363     int count = 0;
 364
 365     loc_push_none(&loc);
 366     while (fgets(line, sizeof(line), fp) != NULL) {
 367         ++lno;
 368         if (line[0] == '\n') {
 369             /* skip empty lines */
 370             continue;
 371         }
 372         if (line[0] == '#') {
 373             /* comment */
 374             continue;
 375         }
 376         if (line[0] == '[') {
 377             QDict *prev = qdict;
 378             if (sscanf(line, "[%63s \"%63[^\"]\"]", group, value) == 2) {
 379                 qdict = qdict_new();
 380                 qdict_put_str(qdict, "id", value);
 381                 count++;
 382             } else if (sscanf(line, "[%63[^]]]", group) == 1) {
 383                 qdict = qdict_new();
 384                 count++;
 385             }
 386             if (qdict != prev) {
 387                 if (prev) {
 388                     cb(prev_group, prev, opaque, &local_err);
 389                     qobject_unref(prev);
 390                     if (local_err) {
 391                         error_propagate(errp, local_err);
 392                         goto out;
 393                     }
 394                 }
 395                 strcpy(prev_group, group);
 396                 continue;
 397             }
 398         }
 399         loc_set_file(fname, lno);
 400         value[0] = '\0';
 401         if (sscanf(line, " %63s = \"%1023[^\"]\"", arg, value) == 2 ||
 402             sscanf(line, " %63s = \"\"", arg) == 1) {
 403             /* arg = value */
 404             if (qdict == NULL) {
 405                 error_setg(errp, "no group defined");
 406                 goto out;
 407             }
 408             qdict_put_str(qdict, arg, value);
 409             continue;
 410         }
 411         error_setg(errp, "parse error");
 412         goto out;
 413     }
 414     if (ferror(fp)) {
 415         loc_pop(&loc);
 416         error_setg_errno(errp, errno, "Cannot read config file");
 417         return res;
 418     }
 419     res = count;
 420 out:
 421     if (qdict) {
 422         cb(group, qdict, opaque, errp);
 423         qobject_unref(qdict);
 424     }
 425     loc_pop(&loc);
 426     return res;
 427 }
 428
 429 void qemu_config_do_parse(const char *group, QDict *qdict, void *opaque, Error **errp)
 430 {
 431     QemuOptsList **lists = opaque;
 432     QemuOptsList *list;
 433
 434     list = find_list(lists, group, errp);
 435     if (!list) {
 436         return;
 437     }
 438
 439     qemu_opts_from_qdict(list, qdict, errp);
 440 }
 441
 442 int qemu_config_parse(FILE *fp, QemuOptsList **lists, const char *fname, Error **errp)
 443 {
 444     return qemu_config_foreach(fp, qemu_config_do_parse, lists, fname, errp);
 445 }
 446
 447 int qemu_read_config_file(const char *filename, QEMUConfigCB *cb, Error **errp)
 448 {
 449     FILE *f = fopen(filename, "r");
 450     int ret;
 451
 452     if (f == NULL) {
 453         error_setg_file_open(errp, errno, filename);
 454         return -errno;
 455     }
 456
 457     ret = qemu_config_foreach(f, cb, vm_config_groups, filename, errp);
 458     fclose(f);
 459     return ret;
 460 }
 461
 462 static void config_parse_qdict_section(QDict *options, QemuOptsList *opts,
 463                                        Error **errp)
 464 {
 465     QemuOpts *subopts;
 466     QDict *subqdict;
 467     QList *list = 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, errp);
 480     if (!subopts) {
 481         goto out;
 482     }
 483
 484     if (!qemu_opts_absorb_qdict(subopts, subqdict, errp)) {
 485         goto out;
 486     }
 487
 488     enum_size = qdict_size(subqdict);
 489     if (enum_size < orig_size && enum_size) {
 490         error_setg(errp, "Unknown option '%s' for [%s]",
 491                    qdict_first(subqdict)->key, opts->name);
 492         goto out;
 493     }
 494
 495     if (enum_size) {
 496         /* Multiple, enumerated sections */
 497         QListEntry *list_entry;
 498         unsigned i = 0;
 499
 500         /* Not required anymore */
 501         qemu_opts_del(subopts);
 502
 503         qdict_array_split(subqdict, &list);
 504         if (qdict_size(subqdict)) {
 505             error_setg(errp, "Unused option '%s' for [%s]",
 506                        qdict_first(subqdict)->key, opts->name);
 507             goto out;
 508         }
 509
 510         QLIST_FOREACH_ENTRY(list, list_entry) {
 511             QDict *section = qobject_to(QDict, qlist_entry_obj(list_entry));
 512             char *opt_name;
 513
 514             if (!section) {
 515                 error_setg(errp, "[%s] section (index %u) does not consist of "
 516                            "keys", opts->name, i);
 517                 goto out;
 518             }
 519
 520             opt_name = g_strdup_printf("%s.%u", opts->name, i++);
 521             subopts = qemu_opts_create(opts, opt_name, 1, errp);
 522             g_free(opt_name);
 523             if (!subopts) {
 524                 goto out;
 525             }
 526
 527             if (!qemu_opts_absorb_qdict(subopts, section, errp)) {
 528                 qemu_opts_del(subopts);
 529                 goto out;
 530             }
 531
 532             if (qdict_size(section)) {
 533                 error_setg(errp, "[%s] section doesn't support the option '%s'",
 534                            opts->name, qdict_first(section)->key);
 535                 qemu_opts_del(subopts);
 536                 goto out;
 537             }
 538         }
 539     }
 540
 541 out:
 542     qobject_unref(subqdict);
 543     qobject_unref(list);
 544 }
 545
 546 void qemu_config_parse_qdict(QDict *options, QemuOptsList **lists,
 547                              Error **errp)
 548 {
 549     int i;
 550     Error *local_err = NULL;
 551
 552     for (i = 0; lists[i]; i++) {
 553         config_parse_qdict_section(options, lists[i], &local_err);
 554         if (local_err) {
 555             error_propagate(errp, local_err);
 556             return;
 557         }
 558     }
 559 }