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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * copyright (c) 2006 IBM Corporation
4 * Authored by: Mike D. Day <[email protected]>
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_obj(struct xen_compile_info);
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_obj(struct xen_compile_info);
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_obj(struct xen_compile_info);
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_obj(struct xen_platform_parameters);
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 if (ret > PAGE_SIZE)
370 return -ENOSPC;
371
372 buildid = kmalloc(sizeof(*buildid) + ret, GFP_KERNEL);
373 if (!buildid)
374 return -ENOMEM;
375
376 buildid->len = ret;
377 ret = HYPERVISOR_xen_version(XENVER_build_id, buildid);
378 if (ret > 0) {
379 /* Build id is binary, not a string. */
380 memcpy(buffer, buildid->buf, ret);
381 }
382 kfree(buildid);
383
384 return ret;
385}
386
387HYPERVISOR_ATTR_RO(buildid);
388
389static struct attribute *xen_properties_attrs[] = {
390 &capabilities_attr.attr,
391 &changeset_attr.attr,
392 &virtual_start_attr.attr,
393 &pagesize_attr.attr,
394 &features_attr.attr,
395 &buildid_attr.attr,
396 NULL
397};
398
399static const struct attribute_group xen_properties_group = {
400 .name = "properties",
401 .attrs = xen_properties_attrs,
402};
403
404static int __init xen_sysfs_properties_init(void)
405{
406 return sysfs_create_group(hypervisor_kobj, &xen_properties_group);
407}
408
409#define FLAG_UNAME "unknown"
410#define FLAG_UNAME_FMT FLAG_UNAME "%02u"
411#define FLAG_UNAME_MAX sizeof(FLAG_UNAME "XX")
412#define FLAG_COUNT (sizeof(xen_start_flags) * BITS_PER_BYTE)
413static_assert(sizeof(xen_start_flags) <=
414 sizeof_field(struct hyp_sysfs_attr, hyp_attr_value));
415
416static ssize_t flag_show(struct hyp_sysfs_attr *attr, char *buffer)
417{
418 char *p = buffer;
419
420 *p++ = '0' + ((xen_start_flags & attr->hyp_attr_value) != 0);
421 *p++ = '\n';
422 return p - buffer;
423}
424
425#define FLAG_NODE(flag, node) \
426 [ilog2(flag)] = { \
427 .attr = { .name = #node, .mode = 0444 },\
428 .show = flag_show, \
429 .hyp_attr_value = flag \
430 }
431
432/*
433 * Add new, known flags here. No other changes are required, but
434 * note that each known flag wastes one entry in flag_unames[].
435 * The code/complexity machinations to avoid this isn't worth it
436 * for a few entries, but keep it in mind.
437 */
438static struct hyp_sysfs_attr flag_attrs[FLAG_COUNT] = {
439 FLAG_NODE(SIF_PRIVILEGED, privileged),
440 FLAG_NODE(SIF_INITDOMAIN, initdomain)
441};
442static struct attribute_group xen_flags_group = {
443 .name = "start_flags",
444 .attrs = (struct attribute *[FLAG_COUNT + 1]){}
445};
446static char flag_unames[FLAG_COUNT][FLAG_UNAME_MAX];
447
448static int __init xen_sysfs_flags_init(void)
449{
450 for (unsigned fnum = 0; fnum != FLAG_COUNT; fnum++) {
451 if (likely(flag_attrs[fnum].attr.name == NULL)) {
452 sprintf(flag_unames[fnum], FLAG_UNAME_FMT, fnum);
453 flag_attrs[fnum].attr.name = flag_unames[fnum];
454 flag_attrs[fnum].attr.mode = 0444;
455 flag_attrs[fnum].show = flag_show;
456 flag_attrs[fnum].hyp_attr_value = 1 << fnum;
457 }
458 xen_flags_group.attrs[fnum] = &flag_attrs[fnum].attr;
459 }
460 return sysfs_create_group(hypervisor_kobj, &xen_flags_group);
461}
462
463#ifdef CONFIG_XEN_HAVE_VPMU
464struct pmu_mode {
465 const char *name;
466 uint32_t mode;
467};
468
469static struct pmu_mode pmu_modes[] = {
470 {"off", XENPMU_MODE_OFF},
471 {"self", XENPMU_MODE_SELF},
472 {"hv", XENPMU_MODE_HV},
473 {"all", XENPMU_MODE_ALL}
474};
475
476static ssize_t pmu_mode_store(struct hyp_sysfs_attr *attr,
477 const char *buffer, size_t len)
478{
479 int ret;
480 struct xen_pmu_params xp;
481 int i;
482
483 for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) {
484 if (strncmp(buffer, pmu_modes[i].name, len - 1) == 0) {
485 xp.val = pmu_modes[i].mode;
486 break;
487 }
488 }
489
490 if (i == ARRAY_SIZE(pmu_modes))
491 return -EINVAL;
492
493 xp.version.maj = XENPMU_VER_MAJ;
494 xp.version.min = XENPMU_VER_MIN;
495 ret = HYPERVISOR_xenpmu_op(XENPMU_mode_set, &xp);
496 if (ret)
497 return ret;
498
499 return len;
500}
501
502static ssize_t pmu_mode_show(struct hyp_sysfs_attr *attr, char *buffer)
503{
504 int ret;
505 struct xen_pmu_params xp;
506 int i;
507 uint32_t mode;
508
509 xp.version.maj = XENPMU_VER_MAJ;
510 xp.version.min = XENPMU_VER_MIN;
511 ret = HYPERVISOR_xenpmu_op(XENPMU_mode_get, &xp);
512 if (ret)
513 return ret;
514
515 mode = (uint32_t)xp.val;
516 for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) {
517 if (mode == pmu_modes[i].mode)
518 return sprintf(buffer, "%s\n", pmu_modes[i].name);
519 }
520
521 return -EINVAL;
522}
523HYPERVISOR_ATTR_RW(pmu_mode);
524
525static ssize_t pmu_features_store(struct hyp_sysfs_attr *attr,
526 const char *buffer, size_t len)
527{
528 int ret;
529 uint32_t features;
530 struct xen_pmu_params xp;
531
532 ret = kstrtou32(buffer, 0, &features);
533 if (ret)
534 return ret;
535
536 xp.val = features;
537 xp.version.maj = XENPMU_VER_MAJ;
538 xp.version.min = XENPMU_VER_MIN;
539 ret = HYPERVISOR_xenpmu_op(XENPMU_feature_set, &xp);
540 if (ret)
541 return ret;
542
543 return len;
544}
545
546static ssize_t pmu_features_show(struct hyp_sysfs_attr *attr, char *buffer)
547{
548 int ret;
549 struct xen_pmu_params xp;
550
551 xp.version.maj = XENPMU_VER_MAJ;
552 xp.version.min = XENPMU_VER_MIN;
553 ret = HYPERVISOR_xenpmu_op(XENPMU_feature_get, &xp);
554 if (ret)
555 return ret;
556
557 return sprintf(buffer, "0x%x\n", (uint32_t)xp.val);
558}
559HYPERVISOR_ATTR_RW(pmu_features);
560
561static struct attribute *xen_pmu_attrs[] = {
562 &pmu_mode_attr.attr,
563 &pmu_features_attr.attr,
564 NULL
565};
566
567static const struct attribute_group xen_pmu_group = {
568 .name = "pmu",
569 .attrs = xen_pmu_attrs,
570};
571
572static int __init xen_sysfs_pmu_init(void)
573{
574 return sysfs_create_group(hypervisor_kobj, &xen_pmu_group);
575}
576#endif
577
578static int __init hyper_sysfs_init(void)
579{
580 int ret;
581
582 if (!xen_domain())
583 return -ENODEV;
584
585 ret = xen_sysfs_type_init();
586 if (ret)
587 goto out;
588 ret = xen_sysfs_guest_type_init();
589 if (ret)
590 goto guest_type_out;
591 ret = xen_sysfs_version_init();
592 if (ret)
593 goto version_out;
594 ret = xen_sysfs_compilation_init();
595 if (ret)
596 goto comp_out;
597 ret = xen_sysfs_uuid_init();
598 if (ret)
599 goto uuid_out;
600 ret = xen_sysfs_properties_init();
601 if (ret)
602 goto prop_out;
603 ret = xen_sysfs_flags_init();
604 if (ret)
605 goto flags_out;
606#ifdef CONFIG_XEN_HAVE_VPMU
607 if (xen_initial_domain()) {
608 ret = xen_sysfs_pmu_init();
609 if (ret) {
610 sysfs_remove_group(hypervisor_kobj, &xen_flags_group);
611 goto flags_out;
612 }
613 }
614#endif
615 goto out;
616
617flags_out:
618 sysfs_remove_group(hypervisor_kobj, &xen_properties_group);
619prop_out:
620 sysfs_remove_file(hypervisor_kobj, &uuid_attr.attr);
621uuid_out:
622 sysfs_remove_group(hypervisor_kobj, &xen_compilation_group);
623comp_out:
624 sysfs_remove_group(hypervisor_kobj, &version_group);
625version_out:
626 sysfs_remove_file(hypervisor_kobj, &guest_type_attr.attr);
627guest_type_out:
628 sysfs_remove_file(hypervisor_kobj, &type_attr.attr);
629out:
630 return ret;
631}
632device_initcall(hyper_sysfs_init);
633
634static ssize_t hyp_sysfs_show(struct kobject *kobj,
635 struct attribute *attr,
636 char *buffer)
637{
638 struct hyp_sysfs_attr *hyp_attr;
639 hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr);
640 if (hyp_attr->show)
641 return hyp_attr->show(hyp_attr, buffer);
642 return 0;
643}
644
645static ssize_t hyp_sysfs_store(struct kobject *kobj,
646 struct attribute *attr,
647 const char *buffer,
648 size_t len)
649{
650 struct hyp_sysfs_attr *hyp_attr;
651 hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr);
652 if (hyp_attr->store)
653 return hyp_attr->store(hyp_attr, buffer, len);
654 return 0;
655}
656
657static const struct sysfs_ops hyp_sysfs_ops = {
658 .show = hyp_sysfs_show,
659 .store = hyp_sysfs_store,
660};
661
662static const struct kobj_type hyp_sysfs_kobj_type = {
663 .sysfs_ops = &hyp_sysfs_ops,
664};
665
666static int __init hypervisor_subsys_init(void)
667{
668 if (!xen_domain())
669 return -ENODEV;
670
671 hypervisor_kobj->ktype = &hyp_sysfs_kobj_type;
672 return 0;
673}
674device_initcall(hypervisor_subsys_init);