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