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/qdict.h"
   6 #include "qapi/qmp/qlist.h"
   7 #include "qemu/error-report.h"
   8 #include "qemu/option.h"
   9 #include "qemu/config-file.h"
  10
  11 static QemuOptsList *vm_config_groups[48];
  12 static QemuOptsList *drive_config_groups[5];
  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                 del_entry->next = NULL;
 112                 qapi_free_CommandLineParameterInfoList(del_entry);
 113                 break;
 114             }
 115             pre_entry = pre_entry->next;
 116         }
 117         cur = cur->next;
 118     }
 119 }
 120
 121 /* merge the description items of two parameter infolists */
 122 static void connect_infolist(CommandLineParameterInfoList *head,
 123                              CommandLineParameterInfoList *new)
 124 {
 125     CommandLineParameterInfoList *cur;
 126
 127     cur = head;
 128     while (cur->next) {
 129         cur = cur->next;
 130     }
 131     cur->next = new;
 132 }
 133
 134 /* access all the local QemuOptsLists for drive option */
 135 static CommandLineParameterInfoList *get_drive_infolist(void)
 136 {
 137     CommandLineParameterInfoList *head = NULL, *cur;
 138     int i;
 139
 140     for (i = 0; drive_config_groups[i] != NULL; i++) {
 141         if (!head) {
 142             head = query_option_descs(drive_config_groups[i]->desc);
 143         } else {
 144             cur = query_option_descs(drive_config_groups[i]->desc);
 145             connect_infolist(head, cur);
 146         }
 147     }
 148     cleanup_infolist(head);
 149
 150     return head;
 151 }
 152
 153 /* restore machine options that are now machine's properties */
 154 static QemuOptsList machine_opts = {
 155     .merge_lists = true,
 156     .head = QTAILQ_HEAD_INITIALIZER(machine_opts.head),
 157     .desc = {
 158         {
 159             .name = "type",
 160             .type = QEMU_OPT_STRING,
 161             .help = "emulated machine"
 162         },{
 163             .name = "accel",
 164             .type = QEMU_OPT_STRING,
 165             .help = "accelerator list",
 166         },{
 167             .name = "kernel_irqchip",
 168             .type = QEMU_OPT_BOOL,
 169             .help = "use KVM in-kernel irqchip",
 170         },{
 171             .name = "kvm_shadow_mem",
 172             .type = QEMU_OPT_SIZE,
 173             .help = "KVM shadow MMU size",
 174         },{
 175             .name = "kernel",
 176             .type = QEMU_OPT_STRING,
 177             .help = "Linux kernel image file",
 178         },{
 179             .name = "initrd",
 180             .type = QEMU_OPT_STRING,
 181             .help = "Linux initial ramdisk file",
 182         },{
 183             .name = "append",
 184             .type = QEMU_OPT_STRING,
 185             .help = "Linux kernel command line",
 186         },{
 187             .name = "dtb",
 188             .type = QEMU_OPT_STRING,
 189             .help = "Linux kernel device tree file",
 190         },{
 191             .name = "dumpdtb",
 192             .type = QEMU_OPT_STRING,
 193             .help = "Dump current dtb to a file and quit",
 194         },{
 195             .name = "phandle_start",
 196             .type = QEMU_OPT_NUMBER,
 197             .help = "The first phandle ID we may generate dynamically",
 198         },{
 199             .name = "dt_compatible",
 200             .type = QEMU_OPT_STRING,
 201             .help = "Overrides the \"compatible\" property of the dt root node",
 202         },{
 203             .name = "dump-guest-core",
 204             .type = QEMU_OPT_BOOL,
 205             .help = "Include guest memory in  a core dump",
 206         },{
 207             .name = "mem-merge",
 208             .type = QEMU_OPT_BOOL,
 209             .help = "enable/disable memory merge support",
 210         },{
 211             .name = "usb",
 212             .type = QEMU_OPT_BOOL,
 213             .help = "Set on/off to enable/disable usb",
 214         },{
 215             .name = "firmware",
 216             .type = QEMU_OPT_STRING,
 217             .help = "firmware image",
 218         },{
 219             .name = "iommu",
 220             .type = QEMU_OPT_BOOL,
 221             .help = "Set on/off to enable/disable Intel IOMMU (VT-d)",
 222         },{
 223             .name = "suppress-vmdesc",
 224             .type = QEMU_OPT_BOOL,
 225             .help = "Set on to disable self-describing migration",
 226         },{
 227             .name = "aes-key-wrap",
 228             .type = QEMU_OPT_BOOL,
 229             .help = "enable/disable AES key wrapping using the CPACF wrapping key",
 230         },{
 231             .name = "dea-key-wrap",
 232             .type = QEMU_OPT_BOOL,
 233             .help = "enable/disable DEA key wrapping using the CPACF wrapping key",
 234         },{
 235             .name = "loadparm",
 236             .type = QEMU_OPT_STRING,
 237             .help = "Up to 8 chars in set of [A-Za-z0-9. ](lower case chars"
 238                     " converted to upper case) to pass to machine"
 239                     " loader, boot manager, and guest kernel",
 240         },
 241         { /* End of list */ }
 242     }
 243 };
 244
 245 CommandLineOptionInfoList *qmp_query_command_line_options(bool has_option,
 246                                                           const char *option,
 247                                                           Error **errp)
 248 {
 249     CommandLineOptionInfoList *conf_list = NULL, *entry;
 250     CommandLineOptionInfo *info;
 251     int i;
 252
 253     for (i = 0; vm_config_groups[i] != NULL; i++) {
 254         if (!has_option || !strcmp(option, vm_config_groups[i]->name)) {
 255             info = g_malloc0(sizeof(*info));
 256             info->option = g_strdup(vm_config_groups[i]->name);
 257             if (!strcmp("drive", vm_config_groups[i]->name)) {
 258                 info->parameters = get_drive_infolist();
 259             } else if (!strcmp("machine", vm_config_groups[i]->name)) {
 260                 info->parameters = query_option_descs(machine_opts.desc);
 261             } else {
 262                 info->parameters =
 263                     query_option_descs(vm_config_groups[i]->desc);
 264             }
 265             entry = g_malloc0(sizeof(*entry));
 266             entry->value = info;
 267             entry->next = conf_list;
 268             conf_list = entry;
 269         }
 270     }
 271
 272     if (conf_list == NULL) {
 273         error_setg(errp, "invalid option name: %s", option);
 274     }
 275
 276     return conf_list;
 277 }
 278
 279 QemuOptsList *qemu_find_opts_err(const char *group, Error **errp)
 280 {
 281     return find_list(vm_config_groups, group, errp);
 282 }
 283
 284 void qemu_add_drive_opts(QemuOptsList *list)
 285 {
 286     int entries, i;
 287
 288     entries = ARRAY_SIZE(drive_config_groups);
 289     entries--; /* keep list NULL terminated */
 290     for (i = 0; i < entries; i++) {
 291         if (drive_config_groups[i] == NULL) {
 292             drive_config_groups[i] = list;
 293             return;
 294         }
 295     }
 296     fprintf(stderr, "ran out of space in drive_config_groups");
 297     abort();
 298 }
 299
 300 void qemu_add_opts(QemuOptsList *list)
 301 {
 302     int entries, i;
 303
 304     entries = ARRAY_SIZE(vm_config_groups);
 305     entries--; /* keep list NULL terminated */
 306     for (i = 0; i < entries; i++) {
 307         if (vm_config_groups[i] == NULL) {
 308             vm_config_groups[i] = list;
 309             return;
 310         }
 311     }
 312     fprintf(stderr, "ran out of space in vm_config_groups");
 313     abort();
 314 }
 315
 316 int qemu_set_option(const char *str)
 317 {
 318     Error *local_err = NULL;
 319     char group[64], id[64], arg[64];
 320     QemuOptsList *list;
 321     QemuOpts *opts;
 322     int rc, offset;
 323
 324     rc = sscanf(str, "%63[^.].%63[^.].%63[^=]%n", group, id, arg, &offset);
 325     if (rc < 3 || str[offset] != '=') {
 326         error_report("can't parse: \"%s\"", str);
 327         return -1;
 328     }
 329
 330     list = qemu_find_opts(group);
 331     if (list == NULL) {
 332         return -1;
 333     }
 334
 335     opts = qemu_opts_find(list, id);
 336     if (!opts) {
 337         error_report("there is no %s \"%s\" defined",
 338                      list->name, id);
 339         return -1;
 340     }
 341
 342     qemu_opt_set(opts, arg, str + offset + 1, &local_err);
 343     if (local_err) {
 344         error_report_err(local_err);
 345         return -1;
 346     }
 347     return 0;
 348 }
 349
 350 struct ConfigWriteData {
 351     QemuOptsList *list;
 352     FILE *fp;
 353 };
 354
 355 static int config_write_opt(void *opaque, const char *name, const char *value,
 356                             Error **errp)
 357 {
 358     struct ConfigWriteData *data = opaque;
 359
 360     fprintf(data->fp, "  %s = \"%s\"\n", name, value);
 361     return 0;
 362 }
 363
 364 static int config_write_opts(void *opaque, QemuOpts *opts, Error **errp)
 365 {
 366     struct ConfigWriteData *data = opaque;
 367     const char *id = qemu_opts_id(opts);
 368
 369     if (id) {
 370         fprintf(data->fp, "[%s \"%s\"]\n", data->list->name, id);
 371     } else {
 372         fprintf(data->fp, "[%s]\n", data->list->name);
 373     }
 374     qemu_opt_foreach(opts, config_write_opt, data, NULL);
 375     fprintf(data->fp, "\n");
 376     return 0;
 377 }
 378
 379 void qemu_config_write(FILE *fp)
 380 {
 381     struct ConfigWriteData data = { .fp = fp };
 382     QemuOptsList **lists = vm_config_groups;
 383     int i;
 384
 385     fprintf(fp, "# qemu config file\n\n");
 386     for (i = 0; lists[i] != NULL; i++) {
 387         data.list = lists[i];
 388         qemu_opts_foreach(data.list, config_write_opts, &data, NULL);
 389     }
 390 }
 391
 392 /* Returns number of config groups on success, -errno on error */
 393 int qemu_config_parse(FILE *fp, QemuOptsList **lists, const char *fname)
 394 {
 395     char line[1024], group[64], id[64], arg[64], value[1024];
 396     Location loc;
 397     QemuOptsList *list = NULL;
 398     Error *local_err = NULL;
 399     QemuOpts *opts = NULL;
 400     int res = -EINVAL, lno = 0;
 401     int count = 0;
 402
 403     loc_push_none(&loc);
 404     while (fgets(line, sizeof(line), fp) != NULL) {
 405         loc_set_file(fname, ++lno);
 406         if (line[0] == '\n') {
 407             /* skip empty lines */
 408             continue;
 409         }
 410         if (line[0] == '#') {
 411             /* comment */
 412             continue;
 413         }
 414         if (sscanf(line, "[%63s \"%63[^\"]\"]", group, id) == 2) {
 415             /* group with id */
 416             list = find_list(lists, group, &local_err);
 417             if (local_err) {
 418                 error_report_err(local_err);
 419                 goto out;
 420             }
 421             opts = qemu_opts_create(list, id, 1, NULL);
 422             count++;
 423             continue;
 424         }
 425         if (sscanf(line, "[%63[^]]]", group) == 1) {
 426             /* group without id */
 427             list = find_list(lists, group, &local_err);
 428             if (local_err) {
 429                 error_report_err(local_err);
 430                 goto out;
 431             }
 432             opts = qemu_opts_create(list, NULL, 0, &error_abort);
 433             count++;
 434             continue;
 435         }
 436         value[0] = '\0';
 437         if (sscanf(line, " %63s = \"%1023[^\"]\"", arg, value) == 2 ||
 438             sscanf(line, " %63s = \"\"", arg) == 1) {
 439             /* arg = value */
 440             if (opts == NULL) {
 441                 error_report("no group defined");
 442                 goto out;
 443             }
 444             qemu_opt_set(opts, arg, value, &local_err);
 445             if (local_err) {
 446                 error_report_err(local_err);
 447                 goto out;
 448             }
 449             continue;
 450         }
 451         error_report("parse error");
 452         goto out;
 453     }
 454     if (ferror(fp)) {
 455         error_report("error reading file");
 456         goto out;
 457     }
 458     res = count;
 459 out:
 460     loc_pop(&loc);
 461     return res;
 462 }
 463
 464 int qemu_read_config_file(const char *filename)
 465 {
 466     FILE *f = fopen(filename, "r");
 467     int ret;
 468
 469     if (f == NULL) {
 470         return -errno;
 471     }
 472
 473     ret = qemu_config_parse(f, vm_config_groups, filename);
 474     fclose(f);
 475     return ret;
 476 }
 477
 478 static void config_parse_qdict_section(QDict *options, QemuOptsList *opts,
 479                                        Error **errp)
 480 {
 481     QemuOpts *subopts;
 482     QDict *subqdict;
 483     QList *list = NULL;
 484     Error *local_err = NULL;
 485     size_t orig_size, enum_size;
 486     char *prefix;
 487
 488     prefix = g_strdup_printf("%s.", opts->name);
 489     qdict_extract_subqdict(options, &subqdict, prefix);
 490     g_free(prefix);
 491     orig_size = qdict_size(subqdict);
 492     if (!orig_size) {
 493         goto out;
 494     }
 495
 496     subopts = qemu_opts_create(opts, NULL, 0, errp);
 497     if (!subopts) {
 498         goto out;
 499     }
 500
 501     qemu_opts_absorb_qdict(subopts, subqdict, &local_err);
 502     if (local_err) {
 503         error_propagate(errp, local_err);
 504         goto out;
 505     }
 506
 507     enum_size = qdict_size(subqdict);
 508     if (enum_size < orig_size && enum_size) {
 509         error_setg(errp, "Unknown option '%s' for [%s]",
 510                    qdict_first(subqdict)->key, opts->name);
 511         goto out;
 512     }
 513
 514     if (enum_size) {
 515         /* Multiple, enumerated sections */
 516         QListEntry *list_entry;
 517         unsigned i = 0;
 518
 519         /* Not required anymore */
 520         qemu_opts_del(subopts);
 521
 522         qdict_array_split(subqdict, &list);
 523         if (qdict_size(subqdict)) {
 524             error_setg(errp, "Unused option '%s' for [%s]",
 525                        qdict_first(subqdict)->key, opts->name);
 526             goto out;
 527         }
 528
 529         QLIST_FOREACH_ENTRY(list, list_entry) {
 530             QDict *section = qobject_to(QDict, qlist_entry_obj(list_entry));
 531             char *opt_name;
 532
 533             if (!section) {
 534                 error_setg(errp, "[%s] section (index %u) does not consist of "
 535                            "keys", opts->name, i);
 536                 goto out;
 537             }
 538
 539             opt_name = g_strdup_printf("%s.%u", opts->name, i++);
 540             subopts = qemu_opts_create(opts, opt_name, 1, errp);
 541             g_free(opt_name);
 542             if (!subopts) {
 543                 goto out;
 544             }
 545
 546             qemu_opts_absorb_qdict(subopts, section, &local_err);
 547             if (local_err) {
 548                 error_propagate(errp, local_err);
 549                 qemu_opts_del(subopts);
 550                 goto out;
 551             }
 552
 553             if (qdict_size(section)) {
 554                 error_setg(errp, "[%s] section doesn't support the option '%s'",
 555                            opts->name, qdict_first(section)->key);
 556                 qemu_opts_del(subopts);
 557                 goto out;
 558             }
 559         }
 560     }
 561
 562 out:
 563     qobject_unref(subqdict);
 564     qobject_unref(list);
 565 }
 566
 567 void qemu_config_parse_qdict(QDict *options, QemuOptsList **lists,
 568                              Error **errp)
 569 {
 570     int i;
 571     Error *local_err = NULL;
 572
 573     for (i = 0; lists[i]; i++) {
 574         config_parse_qdict_section(options, lists[i], &local_err);
 575         if (local_err) {
 576             error_propagate(errp, local_err);
 577             return;
 578         }
 579     }
 580 }