1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * copyright (c) 2006 IBM Corporation 4 * Authored by: Mike D. Day <ncmike@us.ibm.com> 5 */ 6 7 #include <linux/slab.h> 8 #include <linux/kernel.h> 9 #include <linux/init.h> 10 #include <linux/kobject.h> 11 #include <linux/err.h> 12 13 #include <asm/xen/hypervisor.h> 14 #include <asm/xen/hypercall.h> 15 16 #include <xen/xen.h> 17 #include <xen/xenbus.h> 18 #include <xen/interface/xen.h> 19 #include <xen/interface/version.h> 20 #ifdef CONFIG_XEN_HAVE_VPMU 21 #include <xen/interface/xenpmu.h> 22 #endif 23 24 #define HYPERVISOR_ATTR_RO(_name) \ 25 static struct hyp_sysfs_attr _name##_attr = __ATTR_RO(_name) 26 27 #define HYPERVISOR_ATTR_RW(_name) \ 28 static struct hyp_sysfs_attr _name##_attr = \ 29 __ATTR(_name, 0644, _name##_show, _name##_store) 30 31 struct hyp_sysfs_attr { 32 struct attribute attr; 33 ssize_t (*show)(struct hyp_sysfs_attr *, char *); 34 ssize_t (*store)(struct hyp_sysfs_attr *, const char *, size_t); 35 void *hyp_attr_data; 36 }; 37 38 static ssize_t type_show(struct hyp_sysfs_attr *attr, char *buffer) 39 { 40 return sprintf(buffer, "xen\n"); 41 } 42 43 HYPERVISOR_ATTR_RO(type); 44 45 static int __init xen_sysfs_type_init(void) 46 { 47 return sysfs_create_file(hypervisor_kobj, &type_attr.attr); 48 } 49 50 static ssize_t guest_type_show(struct hyp_sysfs_attr *attr, char *buffer) 51 { 52 const char *type; 53 54 switch (xen_domain_type) { 55 case XEN_NATIVE: 56 /* ARM only. */ 57 type = "Xen"; 58 break; 59 case XEN_PV_DOMAIN: 60 type = "PV"; 61 break; 62 case XEN_HVM_DOMAIN: 63 type = xen_pvh_domain() ? "PVH" : "HVM"; 64 break; 65 default: 66 return -EINVAL; 67 } 68 69 return sprintf(buffer, "%s\n", type); 70 } 71 72 HYPERVISOR_ATTR_RO(guest_type); 73 74 static int __init xen_sysfs_guest_type_init(void) 75 { 76 return sysfs_create_file(hypervisor_kobj, &guest_type_attr.attr); 77 } 78 79 /* xen version attributes */ 80 static ssize_t major_show(struct hyp_sysfs_attr *attr, char *buffer) 81 { 82 int version = HYPERVISOR_xen_version(XENVER_version, NULL); 83 if (version) 84 return sprintf(buffer, "%d\n", version >> 16); 85 return -ENODEV; 86 } 87 88 HYPERVISOR_ATTR_RO(major); 89 90 static ssize_t minor_show(struct hyp_sysfs_attr *attr, char *buffer) 91 { 92 int version = HYPERVISOR_xen_version(XENVER_version, NULL); 93 if (version) 94 return sprintf(buffer, "%d\n", version & 0xff); 95 return -ENODEV; 96 } 97 98 HYPERVISOR_ATTR_RO(minor); 99 100 static ssize_t extra_show(struct hyp_sysfs_attr *attr, char *buffer) 101 { 102 int ret = -ENOMEM; 103 char *extra; 104 105 extra = kmalloc(XEN_EXTRAVERSION_LEN, GFP_KERNEL); 106 if (extra) { 107 ret = HYPERVISOR_xen_version(XENVER_extraversion, extra); 108 if (!ret) 109 ret = sprintf(buffer, "%s\n", extra); 110 kfree(extra); 111 } 112 113 return ret; 114 } 115 116 HYPERVISOR_ATTR_RO(extra); 117 118 static struct attribute *version_attrs[] = { 119 &major_attr.attr, 120 &minor_attr.attr, 121 &extra_attr.attr, 122 NULL 123 }; 124 125 static const struct attribute_group version_group = { 126 .name = "version", 127 .attrs = version_attrs, 128 }; 129 130 static int __init xen_sysfs_version_init(void) 131 { 132 return sysfs_create_group(hypervisor_kobj, &version_group); 133 } 134 135 /* UUID */ 136 137 static ssize_t uuid_show_fallback(struct hyp_sysfs_attr *attr, char *buffer) 138 { 139 char *vm, *val; 140 int ret; 141 extern int xenstored_ready; 142 143 if (!xenstored_ready) 144 return -EBUSY; 145 146 vm = xenbus_read(XBT_NIL, "vm", "", NULL); 147 if (IS_ERR(vm)) 148 return PTR_ERR(vm); 149 val = xenbus_read(XBT_NIL, vm, "uuid", NULL); 150 kfree(vm); 151 if (IS_ERR(val)) 152 return PTR_ERR(val); 153 ret = sprintf(buffer, "%s\n", val); 154 kfree(val); 155 return ret; 156 } 157 158 static ssize_t uuid_show(struct hyp_sysfs_attr *attr, char *buffer) 159 { 160 xen_domain_handle_t uuid; 161 int ret; 162 ret = HYPERVISOR_xen_version(XENVER_guest_handle, uuid); 163 if (ret) 164 return uuid_show_fallback(attr, buffer); 165 ret = sprintf(buffer, "%pU\n", uuid); 166 return ret; 167 } 168 169 HYPERVISOR_ATTR_RO(uuid); 170 171 static int __init xen_sysfs_uuid_init(void) 172 { 173 return sysfs_create_file(hypervisor_kobj, &uuid_attr.attr); 174 } 175 176 /* xen compilation attributes */ 177 178 static ssize_t compiler_show(struct hyp_sysfs_attr *attr, char *buffer) 179 { 180 int ret = -ENOMEM; 181 struct xen_compile_info *info; 182 183 info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL); 184 if (info) { 185 ret = HYPERVISOR_xen_version(XENVER_compile_info, info); 186 if (!ret) 187 ret = sprintf(buffer, "%s\n", info->compiler); 188 kfree(info); 189 } 190 191 return ret; 192 } 193 194 HYPERVISOR_ATTR_RO(compiler); 195 196 static ssize_t compiled_by_show(struct hyp_sysfs_attr *attr, char *buffer) 197 { 198 int ret = -ENOMEM; 199 struct xen_compile_info *info; 200 201 info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL); 202 if (info) { 203 ret = HYPERVISOR_xen_version(XENVER_compile_info, info); 204 if (!ret) 205 ret = sprintf(buffer, "%s\n", info->compile_by); 206 kfree(info); 207 } 208 209 return ret; 210 } 211 212 HYPERVISOR_ATTR_RO(compiled_by); 213 214 static ssize_t compile_date_show(struct hyp_sysfs_attr *attr, char *buffer) 215 { 216 int ret = -ENOMEM; 217 struct xen_compile_info *info; 218 219 info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL); 220 if (info) { 221 ret = HYPERVISOR_xen_version(XENVER_compile_info, info); 222 if (!ret) 223 ret = sprintf(buffer, "%s\n", info->compile_date); 224 kfree(info); 225 } 226 227 return ret; 228 } 229 230 HYPERVISOR_ATTR_RO(compile_date); 231 232 static struct attribute *xen_compile_attrs[] = { 233 &compiler_attr.attr, 234 &compiled_by_attr.attr, 235 &compile_date_attr.attr, 236 NULL 237 }; 238 239 static const struct attribute_group xen_compilation_group = { 240 .name = "compilation", 241 .attrs = xen_compile_attrs, 242 }; 243 244 static int __init xen_sysfs_compilation_init(void) 245 { 246 return sysfs_create_group(hypervisor_kobj, &xen_compilation_group); 247 } 248 249 /* xen properties info */ 250 251 static ssize_t capabilities_show(struct hyp_sysfs_attr *attr, char *buffer) 252 { 253 int ret = -ENOMEM; 254 char *caps; 255 256 caps = kmalloc(XEN_CAPABILITIES_INFO_LEN, GFP_KERNEL); 257 if (caps) { 258 ret = HYPERVISOR_xen_version(XENVER_capabilities, caps); 259 if (!ret) 260 ret = sprintf(buffer, "%s\n", caps); 261 kfree(caps); 262 } 263 264 return ret; 265 } 266 267 HYPERVISOR_ATTR_RO(capabilities); 268 269 static ssize_t changeset_show(struct hyp_sysfs_attr *attr, char *buffer) 270 { 271 int ret = -ENOMEM; 272 char *cset; 273 274 cset = kmalloc(XEN_CHANGESET_INFO_LEN, GFP_KERNEL); 275 if (cset) { 276 ret = HYPERVISOR_xen_version(XENVER_changeset, cset); 277 if (!ret) 278 ret = sprintf(buffer, "%s\n", cset); 279 kfree(cset); 280 } 281 282 return ret; 283 } 284 285 HYPERVISOR_ATTR_RO(changeset); 286 287 static ssize_t virtual_start_show(struct hyp_sysfs_attr *attr, char *buffer) 288 { 289 int ret = -ENOMEM; 290 struct xen_platform_parameters *parms; 291 292 parms = kmalloc(sizeof(struct xen_platform_parameters), GFP_KERNEL); 293 if (parms) { 294 ret = HYPERVISOR_xen_version(XENVER_platform_parameters, 295 parms); 296 if (!ret) 297 ret = sprintf(buffer, "%"PRI_xen_ulong"\n", 298 parms->virt_start); 299 kfree(parms); 300 } 301 302 return ret; 303 } 304 305 HYPERVISOR_ATTR_RO(virtual_start); 306 307 static ssize_t pagesize_show(struct hyp_sysfs_attr *attr, char *buffer) 308 { 309 int ret; 310 311 ret = HYPERVISOR_xen_version(XENVER_pagesize, NULL); 312 if (ret > 0) 313 ret = sprintf(buffer, "%x\n", ret); 314 315 return ret; 316 } 317 318 HYPERVISOR_ATTR_RO(pagesize); 319 320 static ssize_t xen_feature_show(int index, char *buffer) 321 { 322 ssize_t ret; 323 struct xen_feature_info info; 324 325 info.submap_idx = index; 326 ret = HYPERVISOR_xen_version(XENVER_get_features, &info); 327 if (!ret) 328 ret = sprintf(buffer, "%08x", info.submap); 329 330 return ret; 331 } 332 333 static ssize_t features_show(struct hyp_sysfs_attr *attr, char *buffer) 334 { 335 ssize_t len; 336 int i; 337 338 len = 0; 339 for (i = XENFEAT_NR_SUBMAPS-1; i >= 0; i--) { 340 int ret = xen_feature_show(i, buffer + len); 341 if (ret < 0) { 342 if (len == 0) 343 len = ret; 344 break; 345 } 346 len += ret; 347 } 348 if (len > 0) 349 buffer[len++] = '\n'; 350 351 return len; 352 } 353 354 HYPERVISOR_ATTR_RO(features); 355 356 static ssize_t buildid_show(struct hyp_sysfs_attr *attr, char *buffer) 357 { 358 ssize_t ret; 359 struct xen_build_id *buildid; 360 361 ret = HYPERVISOR_xen_version(XENVER_build_id, NULL); 362 if (ret < 0) { 363 if (ret == -EPERM) 364 ret = sprintf(buffer, "<denied>"); 365 return ret; 366 } 367 368 buildid = kmalloc(sizeof(*buildid) + ret, GFP_KERNEL); 369 if (!buildid) 370 return -ENOMEM; 371 372 buildid->len = ret; 373 ret = HYPERVISOR_xen_version(XENVER_build_id, buildid); 374 if (ret > 0) 375 ret = sprintf(buffer, "%s", buildid->buf); 376 kfree(buildid); 377 378 return ret; 379 } 380 381 HYPERVISOR_ATTR_RO(buildid); 382 383 static struct attribute *xen_properties_attrs[] = { 384 &capabilities_attr.attr, 385 &changeset_attr.attr, 386 &virtual_start_attr.attr, 387 &pagesize_attr.attr, 388 &features_attr.attr, 389 &buildid_attr.attr, 390 NULL 391 }; 392 393 static const struct attribute_group xen_properties_group = { 394 .name = "properties", 395 .attrs = xen_properties_attrs, 396 }; 397 398 static int __init xen_sysfs_properties_init(void) 399 { 400 return sysfs_create_group(hypervisor_kobj, &xen_properties_group); 401 } 402 403 #ifdef CONFIG_XEN_HAVE_VPMU 404 struct pmu_mode { 405 const char *name; 406 uint32_t mode; 407 }; 408 409 static struct pmu_mode pmu_modes[] = { 410 {"off", XENPMU_MODE_OFF}, 411 {"self", XENPMU_MODE_SELF}, 412 {"hv", XENPMU_MODE_HV}, 413 {"all", XENPMU_MODE_ALL} 414 }; 415 416 static ssize_t pmu_mode_store(struct hyp_sysfs_attr *attr, 417 const char *buffer, size_t len) 418 { 419 int ret; 420 struct xen_pmu_params xp; 421 int i; 422 423 for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) { 424 if (strncmp(buffer, pmu_modes[i].name, len - 1) == 0) { 425 xp.val = pmu_modes[i].mode; 426 break; 427 } 428 } 429 430 if (i == ARRAY_SIZE(pmu_modes)) 431 return -EINVAL; 432 433 xp.version.maj = XENPMU_VER_MAJ; 434 xp.version.min = XENPMU_VER_MIN; 435 ret = HYPERVISOR_xenpmu_op(XENPMU_mode_set, &xp); 436 if (ret) 437 return ret; 438 439 return len; 440 } 441 442 static ssize_t pmu_mode_show(struct hyp_sysfs_attr *attr, char *buffer) 443 { 444 int ret; 445 struct xen_pmu_params xp; 446 int i; 447 uint32_t mode; 448 449 xp.version.maj = XENPMU_VER_MAJ; 450 xp.version.min = XENPMU_VER_MIN; 451 ret = HYPERVISOR_xenpmu_op(XENPMU_mode_get, &xp); 452 if (ret) 453 return ret; 454 455 mode = (uint32_t)xp.val; 456 for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) { 457 if (mode == pmu_modes[i].mode) 458 return sprintf(buffer, "%s\n", pmu_modes[i].name); 459 } 460 461 return -EINVAL; 462 } 463 HYPERVISOR_ATTR_RW(pmu_mode); 464 465 static ssize_t pmu_features_store(struct hyp_sysfs_attr *attr, 466 const char *buffer, size_t len) 467 { 468 int ret; 469 uint32_t features; 470 struct xen_pmu_params xp; 471 472 ret = kstrtou32(buffer, 0, &features); 473 if (ret) 474 return ret; 475 476 xp.val = features; 477 xp.version.maj = XENPMU_VER_MAJ; 478 xp.version.min = XENPMU_VER_MIN; 479 ret = HYPERVISOR_xenpmu_op(XENPMU_feature_set, &xp); 480 if (ret) 481 return ret; 482 483 return len; 484 } 485 486 static ssize_t pmu_features_show(struct hyp_sysfs_attr *attr, char *buffer) 487 { 488 int ret; 489 struct xen_pmu_params xp; 490 491 xp.version.maj = XENPMU_VER_MAJ; 492 xp.version.min = XENPMU_VER_MIN; 493 ret = HYPERVISOR_xenpmu_op(XENPMU_feature_get, &xp); 494 if (ret) 495 return ret; 496 497 return sprintf(buffer, "0x%x\n", (uint32_t)xp.val); 498 } 499 HYPERVISOR_ATTR_RW(pmu_features); 500 501 static struct attribute *xen_pmu_attrs[] = { 502 &pmu_mode_attr.attr, 503 &pmu_features_attr.attr, 504 NULL 505 }; 506 507 static const struct attribute_group xen_pmu_group = { 508 .name = "pmu", 509 .attrs = xen_pmu_attrs, 510 }; 511 512 static int __init xen_sysfs_pmu_init(void) 513 { 514 return sysfs_create_group(hypervisor_kobj, &xen_pmu_group); 515 } 516 #endif 517 518 static int __init hyper_sysfs_init(void) 519 { 520 int ret; 521 522 if (!xen_domain()) 523 return -ENODEV; 524 525 ret = xen_sysfs_type_init(); 526 if (ret) 527 goto out; 528 ret = xen_sysfs_guest_type_init(); 529 if (ret) 530 goto guest_type_out; 531 ret = xen_sysfs_version_init(); 532 if (ret) 533 goto version_out; 534 ret = xen_sysfs_compilation_init(); 535 if (ret) 536 goto comp_out; 537 ret = xen_sysfs_uuid_init(); 538 if (ret) 539 goto uuid_out; 540 ret = xen_sysfs_properties_init(); 541 if (ret) 542 goto prop_out; 543 #ifdef CONFIG_XEN_HAVE_VPMU 544 if (xen_initial_domain()) { 545 ret = xen_sysfs_pmu_init(); 546 if (ret) { 547 sysfs_remove_group(hypervisor_kobj, 548 &xen_properties_group); 549 goto prop_out; 550 } 551 } 552 #endif 553 goto out; 554 555 prop_out: 556 sysfs_remove_file(hypervisor_kobj, &uuid_attr.attr); 557 uuid_out: 558 sysfs_remove_group(hypervisor_kobj, &xen_compilation_group); 559 comp_out: 560 sysfs_remove_group(hypervisor_kobj, &version_group); 561 version_out: 562 sysfs_remove_file(hypervisor_kobj, &guest_type_attr.attr); 563 guest_type_out: 564 sysfs_remove_file(hypervisor_kobj, &type_attr.attr); 565 out: 566 return ret; 567 } 568 device_initcall(hyper_sysfs_init); 569 570 static ssize_t hyp_sysfs_show(struct kobject *kobj, 571 struct attribute *attr, 572 char *buffer) 573 { 574 struct hyp_sysfs_attr *hyp_attr; 575 hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr); 576 if (hyp_attr->show) 577 return hyp_attr->show(hyp_attr, buffer); 578 return 0; 579 } 580 581 static ssize_t hyp_sysfs_store(struct kobject *kobj, 582 struct attribute *attr, 583 const char *buffer, 584 size_t len) 585 { 586 struct hyp_sysfs_attr *hyp_attr; 587 hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr); 588 if (hyp_attr->store) 589 return hyp_attr->store(hyp_attr, buffer, len); 590 return 0; 591 } 592 593 static const struct sysfs_ops hyp_sysfs_ops = { 594 .show = hyp_sysfs_show, 595 .store = hyp_sysfs_store, 596 }; 597 598 static struct kobj_type hyp_sysfs_kobj_type = { 599 .sysfs_ops = &hyp_sysfs_ops, 600 }; 601 602 static int __init hypervisor_subsys_init(void) 603 { 604 if (!xen_domain()) 605 return -ENODEV; 606 607 hypervisor_kobj->ktype = &hyp_sysfs_kobj_type; 608 return 0; 609 } 610 device_initcall(hypervisor_subsys_init); 611