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 = \ 29 __ATTR(_name, 0644, _name##_show, _name##_store) 30 31struct 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 38static ssize_t type_show(struct hyp_sysfs_attr *attr, char *buffer) 39{ 40 return sprintf(buffer, "xen\n"); 41} 42 43HYPERVISOR_ATTR_RO(type); 44 45static int __init xen_sysfs_type_init(void) 46{ 47 return sysfs_create_file(hypervisor_kobj, &type_attr.attr); 48} 49 50static 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 72HYPERVISOR_ATTR_RO(guest_type); 73 74static 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 */ 80static 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 88HYPERVISOR_ATTR_RO(major); 89 90static 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 98HYPERVISOR_ATTR_RO(minor); 99 100static 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 116HYPERVISOR_ATTR_RO(extra); 117 118static struct attribute *version_attrs[] = { 119 &major_attr.attr, 120 &minor_attr.attr, 121 &extra_attr.attr, 122 NULL 123}; 124 125static const struct attribute_group version_group = { 126 .name = "version", 127 .attrs = version_attrs, 128}; 129 130static int __init xen_sysfs_version_init(void) 131{ 132 return sysfs_create_group(hypervisor_kobj, &version_group); 133} 134 135/* UUID */ 136 137static 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 158static 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 169HYPERVISOR_ATTR_RO(uuid); 170 171static 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 178static 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 194HYPERVISOR_ATTR_RO(compiler); 195 196static 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 212HYPERVISOR_ATTR_RO(compiled_by); 213 214static 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 230HYPERVISOR_ATTR_RO(compile_date); 231 232static struct attribute *xen_compile_attrs[] = { 233 &compiler_attr.attr, 234 &compiled_by_attr.attr, 235 &compile_date_attr.attr, 236 NULL 237}; 238 239static const struct attribute_group xen_compilation_group = { 240 .name = "compilation", 241 .attrs = xen_compile_attrs, 242}; 243 244static 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 251static 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 267HYPERVISOR_ATTR_RO(capabilities); 268 269static 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 285HYPERVISOR_ATTR_RO(changeset); 286 287static 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 305HYPERVISOR_ATTR_RO(virtual_start); 306 307static 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 318HYPERVISOR_ATTR_RO(pagesize); 319 320static 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 333static 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 354HYPERVISOR_ATTR_RO(features); 355 356static 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 381HYPERVISOR_ATTR_RO(buildid); 382 383static 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 393static const struct attribute_group xen_properties_group = { 394 .name = "properties", 395 .attrs = xen_properties_attrs, 396}; 397 398static 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 404struct pmu_mode { 405 const char *name; 406 uint32_t mode; 407}; 408 409static 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 416static 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 442static 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} 463HYPERVISOR_ATTR_RW(pmu_mode); 464 465static 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 486static 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} 499HYPERVISOR_ATTR_RW(pmu_features); 500 501static struct attribute *xen_pmu_attrs[] = { 502 &pmu_mode_attr.attr, 503 &pmu_features_attr.attr, 504 NULL 505}; 506 507static const struct attribute_group xen_pmu_group = { 508 .name = "pmu", 509 .attrs = xen_pmu_attrs, 510}; 511 512static int __init xen_sysfs_pmu_init(void) 513{ 514 return sysfs_create_group(hypervisor_kobj, &xen_pmu_group); 515} 516#endif 517 518static 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 555prop_out: 556 sysfs_remove_file(hypervisor_kobj, &uuid_attr.attr); 557uuid_out: 558 sysfs_remove_group(hypervisor_kobj, &xen_compilation_group); 559comp_out: 560 sysfs_remove_group(hypervisor_kobj, &version_group); 561version_out: 562 sysfs_remove_file(hypervisor_kobj, &guest_type_attr.attr); 563guest_type_out: 564 sysfs_remove_file(hypervisor_kobj, &type_attr.attr); 565out: 566 return ret; 567} 568device_initcall(hyper_sysfs_init); 569 570static 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 581static 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 593static const struct sysfs_ops hyp_sysfs_ops = { 594 .show = hyp_sysfs_show, 595 .store = hyp_sysfs_store, 596}; 597 598static struct kobj_type hyp_sysfs_kobj_type = { 599 .sysfs_ops = &hyp_sysfs_ops, 600}; 601 602static 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} 610device_initcall(hypervisor_subsys_init); 611