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 ssize_t buildid_show(struct hyp_sysfs_attr *attr, char *buffer)
 360 {
 361         ssize_t ret;
 362         struct xen_build_id *buildid;
 363
 364         ret = HYPERVISOR_xen_version(XENVER_build_id, NULL);
 365         if (ret < 0) {
 366                 if (ret == -EPERM)
 367                         ret = sprintf(buffer, "<denied>");
 368                 return ret;
 369         }
 370
 371         buildid = kmalloc(sizeof(*buildid) + ret, GFP_KERNEL);
 372         if (!buildid)
 373                 return -ENOMEM;
 374
 375         buildid->len = ret;
 376         ret = HYPERVISOR_xen_version(XENVER_build_id, buildid);
 377         if (ret > 0)
 378                 ret = sprintf(buffer, "%s", buildid->buf);
 379         kfree(buildid);
 380
 381         return ret;
 382 }
 383
 384 HYPERVISOR_ATTR_RO(buildid);
 385
 386 static struct attribute *xen_properties_attrs[] = {
 387         &capabilities_attr.attr,
 388         &changeset_attr.attr,
 389         &virtual_start_attr.attr,
 390         &pagesize_attr.attr,
 391         &features_attr.attr,
 392         &buildid_attr.attr,
 393         NULL
 394 };
 395
 396 static const struct attribute_group xen_properties_group = {
 397         .name = "properties",
 398         .attrs = xen_properties_attrs,
 399 };
 400
 401 static int __init xen_sysfs_properties_init(void)
 402 {
 403         return sysfs_create_group(hypervisor_kobj, &xen_properties_group);
 404 }
 405
 406 #ifdef CONFIG_XEN_HAVE_VPMU
 407 struct pmu_mode {
 408         const char *name;
 409         uint32_t mode;
 410 };
 411
 412 static struct pmu_mode pmu_modes[] = {
 413         {"off", XENPMU_MODE_OFF},
 414         {"self", XENPMU_MODE_SELF},
 415         {"hv", XENPMU_MODE_HV},
 416         {"all", XENPMU_MODE_ALL}
 417 };
 418
 419 static ssize_t pmu_mode_store(struct hyp_sysfs_attr *attr,
 420                               const char *buffer, size_t len)
 421 {
 422         int ret;
 423         struct xen_pmu_params xp;
 424         int i;
 425
 426         for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) {
 427                 if (strncmp(buffer, pmu_modes[i].name, len - 1) == 0) {
 428                         xp.val = pmu_modes[i].mode;
 429                         break;
 430                 }
 431         }
 432
 433         if (i == ARRAY_SIZE(pmu_modes))
 434                 return -EINVAL;
 435
 436         xp.version.maj = XENPMU_VER_MAJ;
 437         xp.version.min = XENPMU_VER_MIN;
 438         ret = HYPERVISOR_xenpmu_op(XENPMU_mode_set, &xp);
 439         if (ret)
 440                 return ret;
 441
 442         return len;
 443 }
 444
 445 static ssize_t pmu_mode_show(struct hyp_sysfs_attr *attr, char *buffer)
 446 {
 447         int ret;
 448         struct xen_pmu_params xp;
 449         int i;
 450         uint32_t mode;
 451
 452         xp.version.maj = XENPMU_VER_MAJ;
 453         xp.version.min = XENPMU_VER_MIN;
 454         ret = HYPERVISOR_xenpmu_op(XENPMU_mode_get, &xp);
 455         if (ret)
 456                 return ret;
 457
 458         mode = (uint32_t)xp.val;
 459         for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) {
 460                 if (mode == pmu_modes[i].mode)
 461                         return sprintf(buffer, "%s\n", pmu_modes[i].name);
 462         }
 463
 464         return -EINVAL;
 465 }
 466 HYPERVISOR_ATTR_RW(pmu_mode);
 467
 468 static ssize_t pmu_features_store(struct hyp_sysfs_attr *attr,
 469                                   const char *buffer, size_t len)
 470 {
 471         int ret;
 472         uint32_t features;
 473         struct xen_pmu_params xp;
 474
 475         ret = kstrtou32(buffer, 0, &features);
 476         if (ret)
 477                 return ret;
 478
 479         xp.val = features;
 480         xp.version.maj = XENPMU_VER_MAJ;
 481         xp.version.min = XENPMU_VER_MIN;
 482         ret = HYPERVISOR_xenpmu_op(XENPMU_feature_set, &xp);
 483         if (ret)
 484                 return ret;
 485
 486         return len;
 487 }
 488
 489 static ssize_t pmu_features_show(struct hyp_sysfs_attr *attr, char *buffer)
 490 {
 491         int ret;
 492         struct xen_pmu_params xp;
 493
 494         xp.version.maj = XENPMU_VER_MAJ;
 495         xp.version.min = XENPMU_VER_MIN;
 496         ret = HYPERVISOR_xenpmu_op(XENPMU_feature_get, &xp);
 497         if (ret)
 498                 return ret;
 499
 500         return sprintf(buffer, "0x%x\n", (uint32_t)xp.val);
 501 }
 502 HYPERVISOR_ATTR_RW(pmu_features);
 503
 504 static struct attribute *xen_pmu_attrs[] = {
 505         &pmu_mode_attr.attr,
 506         &pmu_features_attr.attr,
 507         NULL
 508 };
 509
 510 static const struct attribute_group xen_pmu_group = {
 511         .name = "pmu",
 512         .attrs = xen_pmu_attrs,
 513 };
 514
 515 static int __init xen_sysfs_pmu_init(void)
 516 {
 517         return sysfs_create_group(hypervisor_kobj, &xen_pmu_group);
 518 }
 519 #endif
 520
 521 static int __init hyper_sysfs_init(void)
 522 {
 523         int ret;
 524
 525         if (!xen_domain())
 526                 return -ENODEV;
 527
 528         ret = xen_sysfs_type_init();
 529         if (ret)
 530                 goto out;
 531         ret = xen_sysfs_guest_type_init();
 532         if (ret)
 533                 goto guest_type_out;
 534         ret = xen_sysfs_version_init();
 535         if (ret)
 536                 goto version_out;
 537         ret = xen_sysfs_compilation_init();
 538         if (ret)
 539                 goto comp_out;
 540         ret = xen_sysfs_uuid_init();
 541         if (ret)
 542                 goto uuid_out;
 543         ret = xen_sysfs_properties_init();
 544         if (ret)
 545                 goto prop_out;
 546 #ifdef CONFIG_XEN_HAVE_VPMU
 547         if (xen_initial_domain()) {
 548                 ret = xen_sysfs_pmu_init();
 549                 if (ret) {
 550                         sysfs_remove_group(hypervisor_kobj,
 551                                            &xen_properties_group);
 552                         goto prop_out;
 553                 }
 554         }
 555 #endif
 556         goto out;
 557
 558 prop_out:
 559         sysfs_remove_file(hypervisor_kobj, &uuid_attr.attr);
 560 uuid_out:
 561         sysfs_remove_group(hypervisor_kobj, &xen_compilation_group);
 562 comp_out:
 563         sysfs_remove_group(hypervisor_kobj, &version_group);
 564 version_out:
 565         sysfs_remove_file(hypervisor_kobj, &guest_type_attr.attr);
 566 guest_type_out:
 567         sysfs_remove_file(hypervisor_kobj, &type_attr.attr);
 568 out:
 569         return ret;
 570 }
 571 device_initcall(hyper_sysfs_init);
 572
 573 static ssize_t hyp_sysfs_show(struct kobject *kobj,
 574                               struct attribute *attr,
 575                               char *buffer)
 576 {
 577         struct hyp_sysfs_attr *hyp_attr;
 578         hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr);
 579         if (hyp_attr->show)
 580                 return hyp_attr->show(hyp_attr, buffer);
 581         return 0;
 582 }
 583
 584 static ssize_t hyp_sysfs_store(struct kobject *kobj,
 585                                struct attribute *attr,
 586                                const char *buffer,
 587                                size_t len)
 588 {
 589         struct hyp_sysfs_attr *hyp_attr;
 590         hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr);
 591         if (hyp_attr->store)
 592                 return hyp_attr->store(hyp_attr, buffer, len);
 593         return 0;
 594 }
 595
 596 static const struct sysfs_ops hyp_sysfs_ops = {
 597         .show = hyp_sysfs_show,
 598         .store = hyp_sysfs_store,
 599 };
 600
 601 static struct kobj_type hyp_sysfs_kobj_type = {
 602         .sysfs_ops = &hyp_sysfs_ops,
 603 };
 604
 605 static int __init hypervisor_subsys_init(void)
 606 {
 607         if (!xen_domain())
 608                 return -ENODEV;
 609
 610         hypervisor_kobj->ktype = &hyp_sysfs_kobj_type;
 611         return 0;
 612 }
 613 device_initcall(hypervisor_subsys_init);