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) \ 25static struct hyp_sysfs_attr _name##_attr = __ATTR_RO(_name) 26 27#define HYPERVISOR_ATTR_RW(_name) \ 28static struct hyp_sysfs_attr _name##_attr = __ATTR_RW(_name) 29 30struct 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 40static ssize_t type_show(struct hyp_sysfs_attr *attr, char *buffer) 41{ 42 return sprintf(buffer, "xen\n"); 43} 44 45HYPERVISOR_ATTR_RO(type); 46 47static int __init xen_sysfs_type_init(void) 48{ 49 return sysfs_create_file(hypervisor_kobj, &type_attr.attr); 50} 51 52static 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 74HYPERVISOR_ATTR_RO(guest_type); 75 76static 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 */ 82static 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 90HYPERVISOR_ATTR_RO(major); 91 92static 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 100HYPERVISOR_ATTR_RO(minor); 101 102static 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 118HYPERVISOR_ATTR_RO(extra); 119 120static struct attribute *version_attrs[] = { 121 &major_attr.attr, 122 &minor_attr.attr, 123 &extra_attr.attr, 124 NULL 125}; 126 127static const struct attribute_group version_group = { 128 .name = "version", 129 .attrs = version_attrs, 130}; 131 132static int __init xen_sysfs_version_init(void) 133{ 134 return sysfs_create_group(hypervisor_kobj, &version_group); 135} 136 137/* UUID */ 138 139static 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 160static 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 171HYPERVISOR_ATTR_RO(uuid); 172 173static 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 180static 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 196HYPERVISOR_ATTR_RO(compiler); 197 198static 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 214HYPERVISOR_ATTR_RO(compiled_by); 215 216static 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 232HYPERVISOR_ATTR_RO(compile_date); 233 234static struct attribute *xen_compile_attrs[] = { 235 &compiler_attr.attr, 236 &compiled_by_attr.attr, 237 &compile_date_attr.attr, 238 NULL 239}; 240 241static const struct attribute_group xen_compilation_group = { 242 .name = "compilation", 243 .attrs = xen_compile_attrs, 244}; 245 246static 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 253static 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 269HYPERVISOR_ATTR_RO(capabilities); 270 271static 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 287HYPERVISOR_ATTR_RO(changeset); 288 289static 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 307HYPERVISOR_ATTR_RO(virtual_start); 308 309static 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 320HYPERVISOR_ATTR_RO(pagesize); 321 322static 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 335static 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 356HYPERVISOR_ATTR_RO(features); 357 358static 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 383HYPERVISOR_ATTR_RO(buildid); 384 385static 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 395static const struct attribute_group xen_properties_group = { 396 .name = "properties", 397 .attrs = xen_properties_attrs, 398}; 399 400static 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) 409static_assert(sizeof(xen_start_flags) <= 410 sizeof_field(struct hyp_sysfs_attr, hyp_attr_value)); 411 412static 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 */ 434static struct hyp_sysfs_attr flag_attrs[FLAG_COUNT] = { 435 FLAG_NODE(SIF_PRIVILEGED, privileged), 436 FLAG_NODE(SIF_INITDOMAIN, initdomain) 437}; 438static struct attribute_group xen_flags_group = { 439 .name = "start_flags", 440 .attrs = (struct attribute *[FLAG_COUNT + 1]){} 441}; 442static char flag_unames[FLAG_COUNT][FLAG_UNAME_MAX]; 443 444static 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 460struct pmu_mode { 461 const char *name; 462 uint32_t mode; 463}; 464 465static 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 472static 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 498static 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} 519HYPERVISOR_ATTR_RW(pmu_mode); 520 521static 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 542static 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} 555HYPERVISOR_ATTR_RW(pmu_features); 556 557static struct attribute *xen_pmu_attrs[] = { 558 &pmu_mode_attr.attr, 559 &pmu_features_attr.attr, 560 NULL 561}; 562 563static const struct attribute_group xen_pmu_group = { 564 .name = "pmu", 565 .attrs = xen_pmu_attrs, 566}; 567 568static int __init xen_sysfs_pmu_init(void) 569{ 570 return sysfs_create_group(hypervisor_kobj, &xen_pmu_group); 571} 572#endif 573 574static 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 613flags_out: 614 sysfs_remove_group(hypervisor_kobj, &xen_properties_group); 615prop_out: 616 sysfs_remove_file(hypervisor_kobj, &uuid_attr.attr); 617uuid_out: 618 sysfs_remove_group(hypervisor_kobj, &xen_compilation_group); 619comp_out: 620 sysfs_remove_group(hypervisor_kobj, &version_group); 621version_out: 622 sysfs_remove_file(hypervisor_kobj, &guest_type_attr.attr); 623guest_type_out: 624 sysfs_remove_file(hypervisor_kobj, &type_attr.attr); 625out: 626 return ret; 627} 628device_initcall(hyper_sysfs_init); 629 630static 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 641static 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 653static const struct sysfs_ops hyp_sysfs_ops = { 654 .show = hyp_sysfs_show, 655 .store = hyp_sysfs_store, 656}; 657 658static const struct kobj_type hyp_sysfs_kobj_type = { 659 .sysfs_ops = &hyp_sysfs_ops, 660}; 661 662static 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} 670device_initcall(hypervisor_subsys_init); 671