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
type_show(struct hyp_sysfs_attr * attr,char * buffer)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
xen_sysfs_type_init(void)47 static int __init xen_sysfs_type_init(void)
48 {
49 return sysfs_create_file(hypervisor_kobj, &type_attr.attr);
50 }
51
guest_type_show(struct hyp_sysfs_attr * attr,char * buffer)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
xen_sysfs_guest_type_init(void)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 */
major_show(struct hyp_sysfs_attr * attr,char * buffer)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
minor_show(struct hyp_sysfs_attr * attr,char * buffer)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
extra_show(struct hyp_sysfs_attr * attr,char * buffer)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
xen_sysfs_version_init(void)132 static int __init xen_sysfs_version_init(void)
133 {
134 return sysfs_create_group(hypervisor_kobj, &version_group);
135 }
136
137 /* UUID */
138
uuid_show_fallback(struct hyp_sysfs_attr * attr,char * buffer)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
uuid_show(struct hyp_sysfs_attr * attr,char * buffer)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
xen_sysfs_uuid_init(void)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
compiler_show(struct hyp_sysfs_attr * attr,char * buffer)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
compiled_by_show(struct hyp_sysfs_attr * attr,char * buffer)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
compile_date_show(struct hyp_sysfs_attr * attr,char * buffer)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
xen_sysfs_compilation_init(void)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
capabilities_show(struct hyp_sysfs_attr * attr,char * buffer)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
changeset_show(struct hyp_sysfs_attr * attr,char * buffer)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
virtual_start_show(struct hyp_sysfs_attr * attr,char * buffer)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
pagesize_show(struct hyp_sysfs_attr * attr,char * buffer)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
xen_feature_show(int index,char * buffer)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
features_show(struct hyp_sysfs_attr * attr,char * buffer)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
buildid_show(struct hyp_sysfs_attr * attr,char * buffer)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
xen_sysfs_properties_init(void)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
flag_show(struct hyp_sysfs_attr * attr,char * buffer)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
xen_sysfs_flags_init(void)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
pmu_mode_store(struct hyp_sysfs_attr * attr,const char * buffer,size_t len)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
pmu_mode_show(struct hyp_sysfs_attr * attr,char * buffer)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
pmu_features_store(struct hyp_sysfs_attr * attr,const char * buffer,size_t len)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
pmu_features_show(struct hyp_sysfs_attr * attr,char * buffer)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
xen_sysfs_pmu_init(void)568 static int __init xen_sysfs_pmu_init(void)
569 {
570 return sysfs_create_group(hypervisor_kobj, &xen_pmu_group);
571 }
572 #endif
573
hyper_sysfs_init(void)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
hyp_sysfs_show(struct kobject * kobj,struct attribute * attr,char * buffer)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
hyp_sysfs_store(struct kobject * kobj,struct attribute * attr,const char * buffer,size_t len)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
hypervisor_subsys_init(void)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