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 = __ATTR_RW(_name) 29 30 struct hyp_sysfs_attr { 31 struct attribute attr; 32 ssize_t (*show)(struct hyp_sysfs_attr *, char *); 33 ssize_t (*store)(struct hyp_sysfs_attr *, const char *, size_t); 34 union { 35 void *hyp_attr_data; 36 unsigned long hyp_attr_value; 37 }; 38 }; 39 40 static ssize_t type_show(struct hyp_sysfs_attr *attr, char *buffer) 41 { 42 return sprintf(buffer, "xen\n"); 43 } 44 45 HYPERVISOR_ATTR_RO(type); 46 47 static int __init xen_sysfs_type_init(void) 48 { 49 return sysfs_create_file(hypervisor_kobj, &type_attr.attr); 50 } 51 52 static ssize_t guest_type_show(struct hyp_sysfs_attr *attr, char *buffer) 53 { 54 const char *type; 55 56 switch (xen_domain_type) { 57 case XEN_NATIVE: 58 /* ARM only. */ 59 type = "Xen"; 60 break; 61 case XEN_PV_DOMAIN: 62 type = "PV"; 63 break; 64 case XEN_HVM_DOMAIN: 65 type = xen_pvh_domain() ? "PVH" : "HVM"; 66 break; 67 default: 68 return -EINVAL; 69 } 70 71 return sprintf(buffer, "%s\n", type); 72 } 73 74 HYPERVISOR_ATTR_RO(guest_type); 75 76 static int __init xen_sysfs_guest_type_init(void) 77 { 78 return sysfs_create_file(hypervisor_kobj, &guest_type_attr.attr); 79 } 80 81 /* xen version attributes */ 82 static ssize_t major_show(struct hyp_sysfs_attr *attr, char *buffer) 83 { 84 int version = HYPERVISOR_xen_version(XENVER_version, NULL); 85 if (version) 86 return sprintf(buffer, "%d\n", version >> 16); 87 return -ENODEV; 88 } 89 90 HYPERVISOR_ATTR_RO(major); 91 92 static ssize_t minor_show(struct hyp_sysfs_attr *attr, char *buffer) 93 { 94 int version = HYPERVISOR_xen_version(XENVER_version, NULL); 95 if (version) 96 return sprintf(buffer, "%d\n", version & 0xff); 97 return -ENODEV; 98 } 99 100 HYPERVISOR_ATTR_RO(minor); 101 102 static ssize_t extra_show(struct hyp_sysfs_attr *attr, char *buffer) 103 { 104 int ret = -ENOMEM; 105 char *extra; 106 107 extra = kmalloc(XEN_EXTRAVERSION_LEN, GFP_KERNEL); 108 if (extra) { 109 ret = HYPERVISOR_xen_version(XENVER_extraversion, extra); 110 if (!ret) 111 ret = sprintf(buffer, "%s\n", extra); 112 kfree(extra); 113 } 114 115 return ret; 116 } 117 118 HYPERVISOR_ATTR_RO(extra); 119 120 static struct attribute *version_attrs[] = { 121 &major_attr.attr, 122 &minor_attr.attr, 123 &extra_attr.attr, 124 NULL 125 }; 126 127 static const struct attribute_group version_group = { 128 .name = "version", 129 .attrs = version_attrs, 130 }; 131 132 static int __init xen_sysfs_version_init(void) 133 { 134 return sysfs_create_group(hypervisor_kobj, &version_group); 135 } 136 137 /* UUID */ 138 139 static ssize_t uuid_show_fallback(struct hyp_sysfs_attr *attr, char *buffer) 140 { 141 char *vm, *val; 142 int ret; 143 extern int xenstored_ready; 144 145 if (!xenstored_ready) 146 return -EBUSY; 147 148 vm = xenbus_read(XBT_NIL, "vm", "", NULL); 149 if (IS_ERR(vm)) 150 return PTR_ERR(vm); 151 val = xenbus_read(XBT_NIL, vm, "uuid", NULL); 152 kfree(vm); 153 if (IS_ERR(val)) 154 return PTR_ERR(val); 155 ret = sprintf(buffer, "%s\n", val); 156 kfree(val); 157 return ret; 158 } 159 160 static ssize_t uuid_show(struct hyp_sysfs_attr *attr, char *buffer) 161 { 162 xen_domain_handle_t uuid; 163 int ret; 164 ret = HYPERVISOR_xen_version(XENVER_guest_handle, uuid); 165 if (ret) 166 return uuid_show_fallback(attr, buffer); 167 ret = sprintf(buffer, "%pU\n", uuid); 168 return ret; 169 } 170 171 HYPERVISOR_ATTR_RO(uuid); 172 173 static int __init xen_sysfs_uuid_init(void) 174 { 175 return sysfs_create_file(hypervisor_kobj, &uuid_attr.attr); 176 } 177 178 /* xen compilation attributes */ 179 180 static ssize_t compiler_show(struct hyp_sysfs_attr *attr, char *buffer) 181 { 182 int ret = -ENOMEM; 183 struct xen_compile_info *info; 184 185 info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL); 186 if (info) { 187 ret = HYPERVISOR_xen_version(XENVER_compile_info, info); 188 if (!ret) 189 ret = sprintf(buffer, "%s\n", info->compiler); 190 kfree(info); 191 } 192 193 return ret; 194 } 195 196 HYPERVISOR_ATTR_RO(compiler); 197 198 static ssize_t compiled_by_show(struct hyp_sysfs_attr *attr, char *buffer) 199 { 200 int ret = -ENOMEM; 201 struct xen_compile_info *info; 202 203 info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL); 204 if (info) { 205 ret = HYPERVISOR_xen_version(XENVER_compile_info, info); 206 if (!ret) 207 ret = sprintf(buffer, "%s\n", info->compile_by); 208 kfree(info); 209 } 210 211 return ret; 212 } 213 214 HYPERVISOR_ATTR_RO(compiled_by); 215 216 static ssize_t compile_date_show(struct hyp_sysfs_attr *attr, char *buffer) 217 { 218 int ret = -ENOMEM; 219 struct xen_compile_info *info; 220 221 info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL); 222 if (info) { 223 ret = HYPERVISOR_xen_version(XENVER_compile_info, info); 224 if (!ret) 225 ret = sprintf(buffer, "%s\n", info->compile_date); 226 kfree(info); 227 } 228 229 return ret; 230 } 231 232 HYPERVISOR_ATTR_RO(compile_date); 233 234 static struct attribute *xen_compile_attrs[] = { 235 &compiler_attr.attr, 236 &compiled_by_attr.attr, 237 &compile_date_attr.attr, 238 NULL 239 }; 240 241 static const struct attribute_group xen_compilation_group = { 242 .name = "compilation", 243 .attrs = xen_compile_attrs, 244 }; 245 246 static int __init xen_sysfs_compilation_init(void) 247 { 248 return sysfs_create_group(hypervisor_kobj, &xen_compilation_group); 249 } 250 251 /* xen properties info */ 252 253 static ssize_t capabilities_show(struct hyp_sysfs_attr *attr, char *buffer) 254 { 255 int ret = -ENOMEM; 256 char *caps; 257 258 caps = kmalloc(XEN_CAPABILITIES_INFO_LEN, GFP_KERNEL); 259 if (caps) { 260 ret = HYPERVISOR_xen_version(XENVER_capabilities, caps); 261 if (!ret) 262 ret = sprintf(buffer, "%s\n", caps); 263 kfree(caps); 264 } 265 266 return ret; 267 } 268 269 HYPERVISOR_ATTR_RO(capabilities); 270 271 static ssize_t changeset_show(struct hyp_sysfs_attr *attr, char *buffer) 272 { 273 int ret = -ENOMEM; 274 char *cset; 275 276 cset = kmalloc(XEN_CHANGESET_INFO_LEN, GFP_KERNEL); 277 if (cset) { 278 ret = HYPERVISOR_xen_version(XENVER_changeset, cset); 279 if (!ret) 280 ret = sprintf(buffer, "%s\n", cset); 281 kfree(cset); 282 } 283 284 return ret; 285 } 286 287 HYPERVISOR_ATTR_RO(changeset); 288 289 static ssize_t virtual_start_show(struct hyp_sysfs_attr *attr, char *buffer) 290 { 291 int ret = -ENOMEM; 292 struct xen_platform_parameters *parms; 293 294 parms = kmalloc(sizeof(struct xen_platform_parameters), GFP_KERNEL); 295 if (parms) { 296 ret = HYPERVISOR_xen_version(XENVER_platform_parameters, 297 parms); 298 if (!ret) 299 ret = sprintf(buffer, "%"PRI_xen_ulong"\n", 300 parms->virt_start); 301 kfree(parms); 302 } 303 304 return ret; 305 } 306 307 HYPERVISOR_ATTR_RO(virtual_start); 308 309 static ssize_t pagesize_show(struct hyp_sysfs_attr *attr, char *buffer) 310 { 311 int ret; 312 313 ret = HYPERVISOR_xen_version(XENVER_pagesize, NULL); 314 if (ret > 0) 315 ret = sprintf(buffer, "%x\n", ret); 316 317 return ret; 318 } 319 320 HYPERVISOR_ATTR_RO(pagesize); 321 322 static ssize_t xen_feature_show(int index, char *buffer) 323 { 324 ssize_t ret; 325 struct xen_feature_info info; 326 327 info.submap_idx = index; 328 ret = HYPERVISOR_xen_version(XENVER_get_features, &info); 329 if (!ret) 330 ret = sprintf(buffer, "%08x", info.submap); 331 332 return ret; 333 } 334 335 static ssize_t features_show(struct hyp_sysfs_attr *attr, char *buffer) 336 { 337 ssize_t len; 338 int i; 339 340 len = 0; 341 for (i = XENFEAT_NR_SUBMAPS-1; i >= 0; i--) { 342 int ret = xen_feature_show(i, buffer + len); 343 if (ret < 0) { 344 if (len == 0) 345 len = ret; 346 break; 347 } 348 len += ret; 349 } 350 if (len > 0) 351 buffer[len++] = '\n'; 352 353 return len; 354 } 355 356 HYPERVISOR_ATTR_RO(features); 357 358 static ssize_t buildid_show(struct hyp_sysfs_attr *attr, char *buffer) 359 { 360 ssize_t ret; 361 struct xen_build_id *buildid; 362 363 ret = HYPERVISOR_xen_version(XENVER_build_id, NULL); 364 if (ret < 0) { 365 if (ret == -EPERM) 366 ret = sprintf(buffer, "<denied>"); 367 return ret; 368 } 369 370 buildid = kmalloc(sizeof(*buildid) + ret, GFP_KERNEL); 371 if (!buildid) 372 return -ENOMEM; 373 374 buildid->len = ret; 375 ret = HYPERVISOR_xen_version(XENVER_build_id, buildid); 376 if (ret > 0) 377 ret = sprintf(buffer, "%s", buildid->buf); 378 kfree(buildid); 379 380 return ret; 381 } 382 383 HYPERVISOR_ATTR_RO(buildid); 384 385 static struct attribute *xen_properties_attrs[] = { 386 &capabilities_attr.attr, 387 &changeset_attr.attr, 388 &virtual_start_attr.attr, 389 &pagesize_attr.attr, 390 &features_attr.attr, 391 &buildid_attr.attr, 392 NULL 393 }; 394 395 static const struct attribute_group xen_properties_group = { 396 .name = "properties", 397 .attrs = xen_properties_attrs, 398 }; 399 400 static int __init xen_sysfs_properties_init(void) 401 { 402 return sysfs_create_group(hypervisor_kobj, &xen_properties_group); 403 } 404 405 #define FLAG_UNAME "unknown" 406 #define FLAG_UNAME_FMT FLAG_UNAME "%02u" 407 #define FLAG_UNAME_MAX sizeof(FLAG_UNAME "XX") 408 #define FLAG_COUNT (sizeof(xen_start_flags) * BITS_PER_BYTE) 409 static_assert(sizeof(xen_start_flags) <= 410 sizeof_field(struct hyp_sysfs_attr, hyp_attr_value)); 411 412 static ssize_t flag_show(struct hyp_sysfs_attr *attr, char *buffer) 413 { 414 char *p = buffer; 415 416 *p++ = '0' + ((xen_start_flags & attr->hyp_attr_value) != 0); 417 *p++ = '\n'; 418 return p - buffer; 419 } 420 421 #define FLAG_NODE(flag, node) \ 422 [ilog2(flag)] = { \ 423 .attr = { .name = #node, .mode = 0444 },\ 424 .show = flag_show, \ 425 .hyp_attr_value = flag \ 426 } 427 428 /* 429 * Add new, known flags here. No other changes are required, but 430 * note that each known flag wastes one entry in flag_unames[]. 431 * The code/complexity machinations to avoid this isn't worth it 432 * for a few entries, but keep it in mind. 433 */ 434 static struct hyp_sysfs_attr flag_attrs[FLAG_COUNT] = { 435 FLAG_NODE(SIF_PRIVILEGED, privileged), 436 FLAG_NODE(SIF_INITDOMAIN, initdomain) 437 }; 438 static struct attribute_group xen_flags_group = { 439 .name = "start_flags", 440 .attrs = (struct attribute *[FLAG_COUNT + 1]){} 441 }; 442 static char flag_unames[FLAG_COUNT][FLAG_UNAME_MAX]; 443 444 static int __init xen_sysfs_flags_init(void) 445 { 446 for (unsigned fnum = 0; fnum != FLAG_COUNT; fnum++) { 447 if (likely(flag_attrs[fnum].attr.name == NULL)) { 448 sprintf(flag_unames[fnum], FLAG_UNAME_FMT, fnum); 449 flag_attrs[fnum].attr.name = flag_unames[fnum]; 450 flag_attrs[fnum].attr.mode = 0444; 451 flag_attrs[fnum].show = flag_show; 452 flag_attrs[fnum].hyp_attr_value = 1 << fnum; 453 } 454 xen_flags_group.attrs[fnum] = &flag_attrs[fnum].attr; 455 } 456 return sysfs_create_group(hypervisor_kobj, &xen_flags_group); 457 } 458 459 #ifdef CONFIG_XEN_HAVE_VPMU 460 struct pmu_mode { 461 const char *name; 462 uint32_t mode; 463 }; 464 465 static struct pmu_mode pmu_modes[] = { 466 {"off", XENPMU_MODE_OFF}, 467 {"self", XENPMU_MODE_SELF}, 468 {"hv", XENPMU_MODE_HV}, 469 {"all", XENPMU_MODE_ALL} 470 }; 471 472 static ssize_t pmu_mode_store(struct hyp_sysfs_attr *attr, 473 const char *buffer, size_t len) 474 { 475 int ret; 476 struct xen_pmu_params xp; 477 int i; 478 479 for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) { 480 if (strncmp(buffer, pmu_modes[i].name, len - 1) == 0) { 481 xp.val = pmu_modes[i].mode; 482 break; 483 } 484 } 485 486 if (i == ARRAY_SIZE(pmu_modes)) 487 return -EINVAL; 488 489 xp.version.maj = XENPMU_VER_MAJ; 490 xp.version.min = XENPMU_VER_MIN; 491 ret = HYPERVISOR_xenpmu_op(XENPMU_mode_set, &xp); 492 if (ret) 493 return ret; 494 495 return len; 496 } 497 498 static ssize_t pmu_mode_show(struct hyp_sysfs_attr *attr, char *buffer) 499 { 500 int ret; 501 struct xen_pmu_params xp; 502 int i; 503 uint32_t mode; 504 505 xp.version.maj = XENPMU_VER_MAJ; 506 xp.version.min = XENPMU_VER_MIN; 507 ret = HYPERVISOR_xenpmu_op(XENPMU_mode_get, &xp); 508 if (ret) 509 return ret; 510 511 mode = (uint32_t)xp.val; 512 for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) { 513 if (mode == pmu_modes[i].mode) 514 return sprintf(buffer, "%s\n", pmu_modes[i].name); 515 } 516 517 return -EINVAL; 518 } 519 HYPERVISOR_ATTR_RW(pmu_mode); 520 521 static ssize_t pmu_features_store(struct hyp_sysfs_attr *attr, 522 const char *buffer, size_t len) 523 { 524 int ret; 525 uint32_t features; 526 struct xen_pmu_params xp; 527 528 ret = kstrtou32(buffer, 0, &features); 529 if (ret) 530 return ret; 531 532 xp.val = features; 533 xp.version.maj = XENPMU_VER_MAJ; 534 xp.version.min = XENPMU_VER_MIN; 535 ret = HYPERVISOR_xenpmu_op(XENPMU_feature_set, &xp); 536 if (ret) 537 return ret; 538 539 return len; 540 } 541 542 static ssize_t pmu_features_show(struct hyp_sysfs_attr *attr, char *buffer) 543 { 544 int ret; 545 struct xen_pmu_params xp; 546 547 xp.version.maj = XENPMU_VER_MAJ; 548 xp.version.min = XENPMU_VER_MIN; 549 ret = HYPERVISOR_xenpmu_op(XENPMU_feature_get, &xp); 550 if (ret) 551 return ret; 552 553 return sprintf(buffer, "0x%x\n", (uint32_t)xp.val); 554 } 555 HYPERVISOR_ATTR_RW(pmu_features); 556 557 static struct attribute *xen_pmu_attrs[] = { 558 &pmu_mode_attr.attr, 559 &pmu_features_attr.attr, 560 NULL 561 }; 562 563 static const struct attribute_group xen_pmu_group = { 564 .name = "pmu", 565 .attrs = xen_pmu_attrs, 566 }; 567 568 static int __init xen_sysfs_pmu_init(void) 569 { 570 return sysfs_create_group(hypervisor_kobj, &xen_pmu_group); 571 } 572 #endif 573 574 static int __init hyper_sysfs_init(void) 575 { 576 int ret; 577 578 if (!xen_domain()) 579 return -ENODEV; 580 581 ret = xen_sysfs_type_init(); 582 if (ret) 583 goto out; 584 ret = xen_sysfs_guest_type_init(); 585 if (ret) 586 goto guest_type_out; 587 ret = xen_sysfs_version_init(); 588 if (ret) 589 goto version_out; 590 ret = xen_sysfs_compilation_init(); 591 if (ret) 592 goto comp_out; 593 ret = xen_sysfs_uuid_init(); 594 if (ret) 595 goto uuid_out; 596 ret = xen_sysfs_properties_init(); 597 if (ret) 598 goto prop_out; 599 ret = xen_sysfs_flags_init(); 600 if (ret) 601 goto flags_out; 602 #ifdef CONFIG_XEN_HAVE_VPMU 603 if (xen_initial_domain()) { 604 ret = xen_sysfs_pmu_init(); 605 if (ret) { 606 sysfs_remove_group(hypervisor_kobj, &xen_flags_group); 607 goto flags_out; 608 } 609 } 610 #endif 611 goto out; 612 613 flags_out: 614 sysfs_remove_group(hypervisor_kobj, &xen_properties_group); 615 prop_out: 616 sysfs_remove_file(hypervisor_kobj, &uuid_attr.attr); 617 uuid_out: 618 sysfs_remove_group(hypervisor_kobj, &xen_compilation_group); 619 comp_out: 620 sysfs_remove_group(hypervisor_kobj, &version_group); 621 version_out: 622 sysfs_remove_file(hypervisor_kobj, &guest_type_attr.attr); 623 guest_type_out: 624 sysfs_remove_file(hypervisor_kobj, &type_attr.attr); 625 out: 626 return ret; 627 } 628 device_initcall(hyper_sysfs_init); 629 630 static ssize_t hyp_sysfs_show(struct kobject *kobj, 631 struct attribute *attr, 632 char *buffer) 633 { 634 struct hyp_sysfs_attr *hyp_attr; 635 hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr); 636 if (hyp_attr->show) 637 return hyp_attr->show(hyp_attr, buffer); 638 return 0; 639 } 640 641 static ssize_t hyp_sysfs_store(struct kobject *kobj, 642 struct attribute *attr, 643 const char *buffer, 644 size_t len) 645 { 646 struct hyp_sysfs_attr *hyp_attr; 647 hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr); 648 if (hyp_attr->store) 649 return hyp_attr->store(hyp_attr, buffer, len); 650 return 0; 651 } 652 653 static const struct sysfs_ops hyp_sysfs_ops = { 654 .show = hyp_sysfs_show, 655 .store = hyp_sysfs_store, 656 }; 657 658 static const struct kobj_type hyp_sysfs_kobj_type = { 659 .sysfs_ops = &hyp_sysfs_ops, 660 }; 661 662 static int __init hypervisor_subsys_init(void) 663 { 664 if (!xen_domain()) 665 return -ENODEV; 666 667 hypervisor_kobj->ktype = &hyp_sysfs_kobj_type; 668 return 0; 669 } 670 device_initcall(hypervisor_subsys_init); 671