drivers/xen/sys-hypervisor.c

   1 /*
   2  *  copyright (c) 2006 IBM Corporation
   3  *  Authored by: Mike D. Day <ncmike@us.ibm.com>
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License version 2 as
   7  *  published by the Free Software Foundation.
   8  */
   9
  10 #include <linux/slab.h>
  11 #include <linux/kernel.h>
  12 #include <linux/init.h>
  13 #include <linux/kobject.h>
  14 #include <linux/err.h>
  15
  16 #include <asm/xen/hypervisor.h>
  17 #include <asm/xen/hypercall.h>
  18
  19 #include <xen/xen.h>
  20 #include <xen/xenbus.h>
  21 #include <xen/interface/xen.h>
  22 #include <xen/interface/version.h>
  23 #ifdef CONFIG_XEN_HAVE_VPMU
  24 #include <xen/interface/xenpmu.h>
  25 #endif
  26
  27 #define HYPERVISOR_ATTR_RO(_name) \
  28 static struct hyp_sysfs_attr  _name##_attr = __ATTR_RO(_name)
  29
  30 #define HYPERVISOR_ATTR_RW(_name) \
  31 static struct hyp_sysfs_attr _name##_attr = \
  32         __ATTR(_name, 0644, _name##_show, _name##_store)
  33
  34 struct hyp_sysfs_attr {
  35         struct attribute attr;
  36         ssize_t (*show)(struct hyp_sysfs_attr *, char *);
  37         ssize_t (*store)(struct hyp_sysfs_attr *, const char *, size_t);
  38         void *hyp_attr_data;
  39 };
  40
  41 static ssize_t type_show(struct hyp_sysfs_attr *attr, char *buffer)
  42 {
  43         return sprintf(buffer, "xen\n");
  44 }
  45
  46 HYPERVISOR_ATTR_RO(type);
  47
  48 static int __init xen_sysfs_type_init(void)
  49 {
  50         return sysfs_create_file(hypervisor_kobj, &type_attr.attr);
  51 }
  52
  53 static ssize_t guest_type_show(struct hyp_sysfs_attr *attr, char *buffer)
  54 {
  55         const char *type;
  56
  57         switch (xen_domain_type) {
  58         case XEN_NATIVE:
  59                 /* ARM only. */
  60                 type = "Xen";
  61                 break;
  62         case XEN_PV_DOMAIN:
  63                 type = "PV";
  64                 break;
  65         case XEN_HVM_DOMAIN:
  66                 type = xen_pvh_domain() ? "PVH" : "HVM";
  67                 break;
  68         default:
  69                 return -EINVAL;
  70         }
  71
  72         return sprintf(buffer, "%s\n", type);
  73 }
  74
  75 HYPERVISOR_ATTR_RO(guest_type);
  76
  77 static int __init xen_sysfs_guest_type_init(void)
  78 {
  79         return sysfs_create_file(hypervisor_kobj, &guest_type_attr.attr);
  80 }
  81
  82 /* xen version attributes */
  83 static ssize_t major_show(struct hyp_sysfs_attr *attr, char *buffer)
  84 {
  85         int version = HYPERVISOR_xen_version(XENVER_version, NULL);
  86         if (version)
  87                 return sprintf(buffer, "%d\n", version >> 16);
  88         return -ENODEV;
  89 }
  90
  91 HYPERVISOR_ATTR_RO(major);
  92
  93 static ssize_t minor_show(struct hyp_sysfs_attr *attr, char *buffer)
  94 {
  95         int version = HYPERVISOR_xen_version(XENVER_version, NULL);
  96         if (version)
  97                 return sprintf(buffer, "%d\n", version & 0xff);
  98         return -ENODEV;
  99 }
 100
 101 HYPERVISOR_ATTR_RO(minor);
 102
 103 static ssize_t extra_show(struct hyp_sysfs_attr *attr, char *buffer)
 104 {
 105         int ret = -ENOMEM;
 106         char *extra;
 107
 108         extra = kmalloc(XEN_EXTRAVERSION_LEN, GFP_KERNEL);
 109         if (extra) {
 110                 ret = HYPERVISOR_xen_version(XENVER_extraversion, extra);
 111                 if (!ret)
 112                         ret = sprintf(buffer, "%s\n", extra);
 113                 kfree(extra);
 114         }
 115
 116         return ret;
 117 }
 118
 119 HYPERVISOR_ATTR_RO(extra);
 120
 121 static struct attribute *version_attrs[] = {
 122         &major_attr.attr,
 123         &minor_attr.attr,
 124         &extra_attr.attr,
 125         NULL
 126 };
 127
 128 static const struct attribute_group version_group = {
 129         .name = "version",
 130         .attrs = version_attrs,
 131 };
 132
 133 static int __init xen_sysfs_version_init(void)
 134 {
 135         return sysfs_create_group(hypervisor_kobj, &version_group);
 136 }
 137
 138 /* UUID */
 139
 140 static ssize_t uuid_show_fallback(struct hyp_sysfs_attr *attr, char *buffer)
 141 {
 142         char *vm, *val;
 143         int ret;
 144         extern int xenstored_ready;
 145
 146         if (!xenstored_ready)
 147                 return -EBUSY;
 148
 149         vm = xenbus_read(XBT_NIL, "vm", "", NULL);
 150         if (IS_ERR(vm))
 151                 return PTR_ERR(vm);
 152         val = xenbus_read(XBT_NIL, vm, "uuid", NULL);
 153         kfree(vm);
 154         if (IS_ERR(val))
 155                 return PTR_ERR(val);
 156         ret = sprintf(buffer, "%s\n", val);
 157         kfree(val);
 158         return ret;
 159 }
 160
 161 static ssize_t uuid_show(struct hyp_sysfs_attr *attr, char *buffer)
 162 {
 163         xen_domain_handle_t uuid;
 164         int ret;
 165         ret = HYPERVISOR_xen_version(XENVER_guest_handle, uuid);
 166         if (ret)
 167                 return uuid_show_fallback(attr, buffer);
 168         ret = sprintf(buffer, "%pU\n", uuid);
 169         return ret;
 170 }
 171
 172 HYPERVISOR_ATTR_RO(uuid);
 173
 174 static int __init xen_sysfs_uuid_init(void)
 175 {
 176         return sysfs_create_file(hypervisor_kobj, &uuid_attr.attr);
 177 }
 178
 179 /* xen compilation attributes */
 180
 181 static ssize_t compiler_show(struct hyp_sysfs_attr *attr, char *buffer)
 182 {
 183         int ret = -ENOMEM;
 184         struct xen_compile_info *info;
 185
 186         info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
 187         if (info) {
 188                 ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
 189                 if (!ret)
 190                         ret = sprintf(buffer, "%s\n", info->compiler);
 191                 kfree(info);
 192         }
 193
 194         return ret;
 195 }
 196
 197 HYPERVISOR_ATTR_RO(compiler);
 198
 199 static ssize_t compiled_by_show(struct hyp_sysfs_attr *attr, char *buffer)
 200 {
 201         int ret = -ENOMEM;
 202         struct xen_compile_info *info;
 203
 204         info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
 205         if (info) {
 206                 ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
 207                 if (!ret)
 208                         ret = sprintf(buffer, "%s\n", info->compile_by);
 209                 kfree(info);
 210         }
 211
 212         return ret;
 213 }
 214
 215 HYPERVISOR_ATTR_RO(compiled_by);
 216
 217 static ssize_t compile_date_show(struct hyp_sysfs_attr *attr, char *buffer)
 218 {
 219         int ret = -ENOMEM;
 220         struct xen_compile_info *info;
 221
 222         info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
 223         if (info) {
 224                 ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
 225                 if (!ret)
 226                         ret = sprintf(buffer, "%s\n", info->compile_date);
 227                 kfree(info);
 228         }
 229
 230         return ret;
 231 }
 232
 233 HYPERVISOR_ATTR_RO(compile_date);
 234
 235 static struct attribute *xen_compile_attrs[] = {
 236         &compiler_attr.attr,
 237         &compiled_by_attr.attr,
 238         &compile_date_attr.attr,
 239         NULL
 240 };
 241
 242 static const struct attribute_group xen_compilation_group = {
 243         .name = "compilation",
 244         .attrs = xen_compile_attrs,
 245 };
 246
 247 static int __init xen_sysfs_compilation_init(void)
 248 {
 249         return sysfs_create_group(hypervisor_kobj, &xen_compilation_group);
 250 }
 251
 252 /* xen properties info */
 253
 254 static ssize_t capabilities_show(struct hyp_sysfs_attr *attr, char *buffer)
 255 {
 256         int ret = -ENOMEM;
 257         char *caps;
 258
 259         caps = kmalloc(XEN_CAPABILITIES_INFO_LEN, GFP_KERNEL);
 260         if (caps) {
 261                 ret = HYPERVISOR_xen_version(XENVER_capabilities, caps);
 262                 if (!ret)
 263                         ret = sprintf(buffer, "%s\n", caps);
 264                 kfree(caps);
 265         }
 266
 267         return ret;
 268 }
 269
 270 HYPERVISOR_ATTR_RO(capabilities);
 271
 272 static ssize_t changeset_show(struct hyp_sysfs_attr *attr, char *buffer)
 273 {
 274         int ret = -ENOMEM;
 275         char *cset;
 276
 277         cset = kmalloc(XEN_CHANGESET_INFO_LEN, GFP_KERNEL);
 278         if (cset) {
 279                 ret = HYPERVISOR_xen_version(XENVER_changeset, cset);
 280                 if (!ret)
 281                         ret = sprintf(buffer, "%s\n", cset);
 282                 kfree(cset);
 283         }
 284
 285         return ret;
 286 }
 287
 288 HYPERVISOR_ATTR_RO(changeset);
 289
 290 static ssize_t virtual_start_show(struct hyp_sysfs_attr *attr, char *buffer)
 291 {
 292         int ret = -ENOMEM;
 293         struct xen_platform_parameters *parms;
 294
 295         parms = kmalloc(sizeof(struct xen_platform_parameters), GFP_KERNEL);
 296         if (parms) {
 297                 ret = HYPERVISOR_xen_version(XENVER_platform_parameters,
 298                                              parms);
 299                 if (!ret)
 300                         ret = sprintf(buffer, "%"PRI_xen_ulong"\n",
 301                                       parms->virt_start);
 302                 kfree(parms);
 303         }
 304
 305         return ret;
 306 }
 307
 308 HYPERVISOR_ATTR_RO(virtual_start);
 309
 310 static ssize_t pagesize_show(struct hyp_sysfs_attr *attr, char *buffer)
 311 {
 312         int ret;
 313
 314         ret = HYPERVISOR_xen_version(XENVER_pagesize, NULL);
 315         if (ret > 0)
 316                 ret = sprintf(buffer, "%x\n", ret);
 317
 318         return ret;
 319 }
 320
 321 HYPERVISOR_ATTR_RO(pagesize);
 322
 323 static ssize_t xen_feature_show(int index, char *buffer)
 324 {
 325         ssize_t ret;
 326         struct xen_feature_info info;
 327
 328         info.submap_idx = index;
 329         ret = HYPERVISOR_xen_version(XENVER_get_features, &info);
 330         if (!ret)
 331                 ret = sprintf(buffer, "%08x", info.submap);
 332
 333         return ret;
 334 }
 335
 336 static ssize_t features_show(struct hyp_sysfs_attr *attr, char *buffer)
 337 {
 338         ssize_t len;
 339         int i;
 340
 341         len = 0;
 342         for (i = XENFEAT_NR_SUBMAPS-1; i >= 0; i--) {
 343                 int ret = xen_feature_show(i, buffer + len);
 344                 if (ret < 0) {
 345                         if (len == 0)
 346                                 len = ret;
 347                         break;
 348                 }
 349                 len += ret;
 350         }
 351         if (len > 0)
 352                 buffer[len++] = '\n';
 353
 354         return len;
 355 }
 356
 357 HYPERVISOR_ATTR_RO(features);
 358
 359 static struct attribute *xen_properties_attrs[] = {
 360         &capabilities_attr.attr,
 361         &changeset_attr.attr,
 362         &virtual_start_attr.attr,
 363         &pagesize_attr.attr,
 364         &features_attr.attr,
 365         NULL
 366 };
 367
 368 static const struct attribute_group xen_properties_group = {
 369         .name = "properties",
 370         .attrs = xen_properties_attrs,
 371 };
 372
 373 static int __init xen_sysfs_properties_init(void)
 374 {
 375         return sysfs_create_group(hypervisor_kobj, &xen_properties_group);
 376 }
 377
 378 #ifdef CONFIG_XEN_HAVE_VPMU
 379 struct pmu_mode {
 380         const char *name;
 381         uint32_t mode;
 382 };
 383
 384 static struct pmu_mode pmu_modes[] = {
 385         {"off", XENPMU_MODE_OFF},
 386         {"self", XENPMU_MODE_SELF},
 387         {"hv", XENPMU_MODE_HV},
 388         {"all", XENPMU_MODE_ALL}
 389 };
 390
 391 static ssize_t pmu_mode_store(struct hyp_sysfs_attr *attr,
 392                               const char *buffer, size_t len)
 393 {
 394         int ret;
 395         struct xen_pmu_params xp;
 396         int i;
 397
 398         for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) {
 399                 if (strncmp(buffer, pmu_modes[i].name, len - 1) == 0) {
 400                         xp.val = pmu_modes[i].mode;
 401                         break;
 402                 }
 403         }
 404
 405         if (i == ARRAY_SIZE(pmu_modes))
 406                 return -EINVAL;
 407
 408         xp.version.maj = XENPMU_VER_MAJ;
 409         xp.version.min = XENPMU_VER_MIN;
 410         ret = HYPERVISOR_xenpmu_op(XENPMU_mode_set, &xp);
 411         if (ret)
 412                 return ret;
 413
 414         return len;
 415 }
 416
 417 static ssize_t pmu_mode_show(struct hyp_sysfs_attr *attr, char *buffer)
 418 {
 419         int ret;
 420         struct xen_pmu_params xp;
 421         int i;
 422         uint32_t mode;
 423
 424         xp.version.maj = XENPMU_VER_MAJ;
 425         xp.version.min = XENPMU_VER_MIN;
 426         ret = HYPERVISOR_xenpmu_op(XENPMU_mode_get, &xp);
 427         if (ret)
 428                 return ret;
 429
 430         mode = (uint32_t)xp.val;
 431         for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) {
 432                 if (mode == pmu_modes[i].mode)
 433                         return sprintf(buffer, "%s\n", pmu_modes[i].name);
 434         }
 435
 436         return -EINVAL;
 437 }
 438 HYPERVISOR_ATTR_RW(pmu_mode);
 439
 440 static ssize_t pmu_features_store(struct hyp_sysfs_attr *attr,
 441                                   const char *buffer, size_t len)
 442 {
 443         int ret;
 444         uint32_t features;
 445         struct xen_pmu_params xp;
 446
 447         ret = kstrtou32(buffer, 0, &features);
 448         if (ret)
 449                 return ret;
 450
 451         xp.val = features;
 452         xp.version.maj = XENPMU_VER_MAJ;
 453         xp.version.min = XENPMU_VER_MIN;
 454         ret = HYPERVISOR_xenpmu_op(XENPMU_feature_set, &xp);
 455         if (ret)
 456                 return ret;
 457
 458         return len;
 459 }
 460
 461 static ssize_t pmu_features_show(struct hyp_sysfs_attr *attr, char *buffer)
 462 {
 463         int ret;
 464         struct xen_pmu_params xp;
 465
 466         xp.version.maj = XENPMU_VER_MAJ;
 467         xp.version.min = XENPMU_VER_MIN;
 468         ret = HYPERVISOR_xenpmu_op(XENPMU_feature_get, &xp);
 469         if (ret)
 470                 return ret;
 471
 472         return sprintf(buffer, "0x%x\n", (uint32_t)xp.val);
 473 }
 474 HYPERVISOR_ATTR_RW(pmu_features);
 475
 476 static struct attribute *xen_pmu_attrs[] = {
 477         &pmu_mode_attr.attr,
 478         &pmu_features_attr.attr,
 479         NULL
 480 };
 481
 482 static const struct attribute_group xen_pmu_group = {
 483         .name = "pmu",
 484         .attrs = xen_pmu_attrs,
 485 };
 486
 487 static int __init xen_sysfs_pmu_init(void)
 488 {
 489         return sysfs_create_group(hypervisor_kobj, &xen_pmu_group);
 490 }
 491 #endif
 492
 493 static int __init hyper_sysfs_init(void)
 494 {
 495         int ret;
 496
 497         if (!xen_domain())
 498                 return -ENODEV;
 499
 500         ret = xen_sysfs_type_init();
 501         if (ret)
 502                 goto out;
 503         ret = xen_sysfs_guest_type_init();
 504         if (ret)
 505                 goto guest_type_out;
 506         ret = xen_sysfs_version_init();
 507         if (ret)
 508                 goto version_out;
 509         ret = xen_sysfs_compilation_init();
 510         if (ret)
 511                 goto comp_out;
 512         ret = xen_sysfs_uuid_init();
 513         if (ret)
 514                 goto uuid_out;
 515         ret = xen_sysfs_properties_init();
 516         if (ret)
 517                 goto prop_out;
 518 #ifdef CONFIG_XEN_HAVE_VPMU
 519         if (xen_initial_domain()) {
 520                 ret = xen_sysfs_pmu_init();
 521                 if (ret) {
 522                         sysfs_remove_group(hypervisor_kobj,
 523                                            &xen_properties_group);
 524                         goto prop_out;
 525                 }
 526         }
 527 #endif
 528         goto out;
 529
 530 prop_out:
 531         sysfs_remove_file(hypervisor_kobj, &uuid_attr.attr);
 532 uuid_out:
 533         sysfs_remove_group(hypervisor_kobj, &xen_compilation_group);
 534 comp_out:
 535         sysfs_remove_group(hypervisor_kobj, &version_group);
 536 version_out:
 537         sysfs_remove_file(hypervisor_kobj, &guest_type_attr.attr);
 538 guest_type_out:
 539         sysfs_remove_file(hypervisor_kobj, &type_attr.attr);
 540 out:
 541         return ret;
 542 }
 543 device_initcall(hyper_sysfs_init);
 544
 545 static ssize_t hyp_sysfs_show(struct kobject *kobj,
 546                               struct attribute *attr,
 547                               char *buffer)
 548 {
 549         struct hyp_sysfs_attr *hyp_attr;
 550         hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr);
 551         if (hyp_attr->show)
 552                 return hyp_attr->show(hyp_attr, buffer);
 553         return 0;
 554 }
 555
 556 static ssize_t hyp_sysfs_store(struct kobject *kobj,
 557                                struct attribute *attr,
 558                                const char *buffer,
 559                                size_t len)
 560 {
 561         struct hyp_sysfs_attr *hyp_attr;
 562         hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr);
 563         if (hyp_attr->store)
 564                 return hyp_attr->store(hyp_attr, buffer, len);
 565         return 0;
 566 }
 567
 568 static const struct sysfs_ops hyp_sysfs_ops = {
 569         .show = hyp_sysfs_show,
 570         .store = hyp_sysfs_store,
 571 };
 572
 573 static struct kobj_type hyp_sysfs_kobj_type = {
 574         .sysfs_ops = &hyp_sysfs_ops,
 575 };
 576
 577 static int __init hypervisor_subsys_init(void)
 578 {
 579         if (!xen_domain())
 580                 return -ENODEV;
 581
 582         hypervisor_kobj->ktype = &hyp_sysfs_kobj_type;
 583         return 0;
 584 }
 585 device_initcall(hypervisor_subsys_init);