1
2
3
4
5
6
7
8
9
10#include <linux/slab.h>
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/kobject.h>
14#include <linux/err.h>
15
16#include <asm/xen/hypervisor.h>
17#include <asm/xen/hypercall.h>
18
19#include <xen/xen.h>
20#include <xen/xenbus.h>
21#include <xen/interface/xen.h>
22#include <xen/interface/version.h>
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 void xen_sysfs_type_destroy(void)
51{
52 sysfs_remove_file(hypervisor_kobj, &type_attr.attr);
53}
54
55
56static ssize_t major_show(struct hyp_sysfs_attr *attr, char *buffer)
57{
58 int version = HYPERVISOR_xen_version(XENVER_version, NULL);
59 if (version)
60 return sprintf(buffer, "%d\n", version >> 16);
61 return -ENODEV;
62}
63
64HYPERVISOR_ATTR_RO(major);
65
66static ssize_t minor_show(struct hyp_sysfs_attr *attr, char *buffer)
67{
68 int version = HYPERVISOR_xen_version(XENVER_version, NULL);
69 if (version)
70 return sprintf(buffer, "%d\n", version & 0xff);
71 return -ENODEV;
72}
73
74HYPERVISOR_ATTR_RO(minor);
75
76static ssize_t extra_show(struct hyp_sysfs_attr *attr, char *buffer)
77{
78 int ret = -ENOMEM;
79 char *extra;
80
81 extra = kmalloc(XEN_EXTRAVERSION_LEN, GFP_KERNEL);
82 if (extra) {
83 ret = HYPERVISOR_xen_version(XENVER_extraversion, extra);
84 if (!ret)
85 ret = sprintf(buffer, "%s\n", extra);
86 kfree(extra);
87 }
88
89 return ret;
90}
91
92HYPERVISOR_ATTR_RO(extra);
93
94static struct attribute *version_attrs[] = {
95 &major_attr.attr,
96 &minor_attr.attr,
97 &extra_attr.attr,
98 NULL
99};
100
101static const struct attribute_group version_group = {
102 .name = "version",
103 .attrs = version_attrs,
104};
105
106static int __init xen_sysfs_version_init(void)
107{
108 return sysfs_create_group(hypervisor_kobj, &version_group);
109}
110
111static void xen_sysfs_version_destroy(void)
112{
113 sysfs_remove_group(hypervisor_kobj, &version_group);
114}
115
116
117
118static ssize_t uuid_show_fallback(struct hyp_sysfs_attr *attr, char *buffer)
119{
120 char *vm, *val;
121 int ret;
122 extern int xenstored_ready;
123
124 if (!xenstored_ready)
125 return -EBUSY;
126
127 vm = xenbus_read(XBT_NIL, "vm", "", NULL);
128 if (IS_ERR(vm))
129 return PTR_ERR(vm);
130 val = xenbus_read(XBT_NIL, vm, "uuid", NULL);
131 kfree(vm);
132 if (IS_ERR(val))
133 return PTR_ERR(val);
134 ret = sprintf(buffer, "%s\n", val);
135 kfree(val);
136 return ret;
137}
138
139static ssize_t uuid_show(struct hyp_sysfs_attr *attr, char *buffer)
140{
141 xen_domain_handle_t uuid;
142 int ret;
143 ret = HYPERVISOR_xen_version(XENVER_guest_handle, uuid);
144 if (ret)
145 return uuid_show_fallback(attr, buffer);
146 ret = sprintf(buffer, "%pU\n", uuid);
147 return ret;
148}
149
150HYPERVISOR_ATTR_RO(uuid);
151
152static int __init xen_sysfs_uuid_init(void)
153{
154 return sysfs_create_file(hypervisor_kobj, &uuid_attr.attr);
155}
156
157static void xen_sysfs_uuid_destroy(void)
158{
159 sysfs_remove_file(hypervisor_kobj, &uuid_attr.attr);
160}
161
162
163
164static ssize_t compiler_show(struct hyp_sysfs_attr *attr, char *buffer)
165{
166 int ret = -ENOMEM;
167 struct xen_compile_info *info;
168
169 info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
170 if (info) {
171 ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
172 if (!ret)
173 ret = sprintf(buffer, "%s\n", info->compiler);
174 kfree(info);
175 }
176
177 return ret;
178}
179
180HYPERVISOR_ATTR_RO(compiler);
181
182static ssize_t compiled_by_show(struct hyp_sysfs_attr *attr, char *buffer)
183{
184 int ret = -ENOMEM;
185 struct xen_compile_info *info;
186
187 info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
188 if (info) {
189 ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
190 if (!ret)
191 ret = sprintf(buffer, "%s\n", info->compile_by);
192 kfree(info);
193 }
194
195 return ret;
196}
197
198HYPERVISOR_ATTR_RO(compiled_by);
199
200static ssize_t compile_date_show(struct hyp_sysfs_attr *attr, char *buffer)
201{
202 int ret = -ENOMEM;
203 struct xen_compile_info *info;
204
205 info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
206 if (info) {
207 ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
208 if (!ret)
209 ret = sprintf(buffer, "%s\n", info->compile_date);
210 kfree(info);
211 }
212
213 return ret;
214}
215
216HYPERVISOR_ATTR_RO(compile_date);
217
218static struct attribute *xen_compile_attrs[] = {
219 &compiler_attr.attr,
220 &compiled_by_attr.attr,
221 &compile_date_attr.attr,
222 NULL
223};
224
225static const struct attribute_group xen_compilation_group = {
226 .name = "compilation",
227 .attrs = xen_compile_attrs,
228};
229
230static int __init xen_compilation_init(void)
231{
232 return sysfs_create_group(hypervisor_kobj, &xen_compilation_group);
233}
234
235static void xen_compilation_destroy(void)
236{
237 sysfs_remove_group(hypervisor_kobj, &xen_compilation_group);
238}
239
240
241
242static ssize_t capabilities_show(struct hyp_sysfs_attr *attr, char *buffer)
243{
244 int ret = -ENOMEM;
245 char *caps;
246
247 caps = kmalloc(XEN_CAPABILITIES_INFO_LEN, GFP_KERNEL);
248 if (caps) {
249 ret = HYPERVISOR_xen_version(XENVER_capabilities, caps);
250 if (!ret)
251 ret = sprintf(buffer, "%s\n", caps);
252 kfree(caps);
253 }
254
255 return ret;
256}
257
258HYPERVISOR_ATTR_RO(capabilities);
259
260static ssize_t changeset_show(struct hyp_sysfs_attr *attr, char *buffer)
261{
262 int ret = -ENOMEM;
263 char *cset;
264
265 cset = kmalloc(XEN_CHANGESET_INFO_LEN, GFP_KERNEL);
266 if (cset) {
267 ret = HYPERVISOR_xen_version(XENVER_changeset, cset);
268 if (!ret)
269 ret = sprintf(buffer, "%s\n", cset);
270 kfree(cset);
271 }
272
273 return ret;
274}
275
276HYPERVISOR_ATTR_RO(changeset);
277
278static ssize_t virtual_start_show(struct hyp_sysfs_attr *attr, char *buffer)
279{
280 int ret = -ENOMEM;
281 struct xen_platform_parameters *parms;
282
283 parms = kmalloc(sizeof(struct xen_platform_parameters), GFP_KERNEL);
284 if (parms) {
285 ret = HYPERVISOR_xen_version(XENVER_platform_parameters,
286 parms);
287 if (!ret)
288 ret = sprintf(buffer, "%"PRI_xen_ulong"\n",
289 parms->virt_start);
290 kfree(parms);
291 }
292
293 return ret;
294}
295
296HYPERVISOR_ATTR_RO(virtual_start);
297
298static ssize_t pagesize_show(struct hyp_sysfs_attr *attr, char *buffer)
299{
300 int ret;
301
302 ret = HYPERVISOR_xen_version(XENVER_pagesize, NULL);
303 if (ret > 0)
304 ret = sprintf(buffer, "%x\n", ret);
305
306 return ret;
307}
308
309HYPERVISOR_ATTR_RO(pagesize);
310
311static ssize_t xen_feature_show(int index, char *buffer)
312{
313 ssize_t ret;
314 struct xen_feature_info info;
315
316 info.submap_idx = index;
317 ret = HYPERVISOR_xen_version(XENVER_get_features, &info);
318 if (!ret)
319 ret = sprintf(buffer, "%08x", info.submap);
320
321 return ret;
322}
323
324static ssize_t features_show(struct hyp_sysfs_attr *attr, char *buffer)
325{
326 ssize_t len;
327 int i;
328
329 len = 0;
330 for (i = XENFEAT_NR_SUBMAPS-1; i >= 0; i--) {
331 int ret = xen_feature_show(i, buffer + len);
332 if (ret < 0) {
333 if (len == 0)
334 len = ret;
335 break;
336 }
337 len += ret;
338 }
339 if (len > 0)
340 buffer[len++] = '\n';
341
342 return len;
343}
344
345HYPERVISOR_ATTR_RO(features);
346
347static struct attribute *xen_properties_attrs[] = {
348 &capabilities_attr.attr,
349 &changeset_attr.attr,
350 &virtual_start_attr.attr,
351 &pagesize_attr.attr,
352 &features_attr.attr,
353 NULL
354};
355
356static const struct attribute_group xen_properties_group = {
357 .name = "properties",
358 .attrs = xen_properties_attrs,
359};
360
361static int __init xen_properties_init(void)
362{
363 return sysfs_create_group(hypervisor_kobj, &xen_properties_group);
364}
365
366static void xen_properties_destroy(void)
367{
368 sysfs_remove_group(hypervisor_kobj, &xen_properties_group);
369}
370
371static int __init hyper_sysfs_init(void)
372{
373 int ret;
374
375 if (!xen_domain())
376 return -ENODEV;
377
378 ret = xen_sysfs_type_init();
379 if (ret)
380 goto out;
381 ret = xen_sysfs_version_init();
382 if (ret)
383 goto version_out;
384 ret = xen_compilation_init();
385 if (ret)
386 goto comp_out;
387 ret = xen_sysfs_uuid_init();
388 if (ret)
389 goto uuid_out;
390 ret = xen_properties_init();
391 if (ret)
392 goto prop_out;
393
394 goto out;
395
396prop_out:
397 xen_sysfs_uuid_destroy();
398uuid_out:
399 xen_compilation_destroy();
400comp_out:
401 xen_sysfs_version_destroy();
402version_out:
403 xen_sysfs_type_destroy();
404out:
405 return ret;
406}
407
408static void __exit hyper_sysfs_exit(void)
409{
410 xen_properties_destroy();
411 xen_compilation_destroy();
412 xen_sysfs_uuid_destroy();
413 xen_sysfs_version_destroy();
414 xen_sysfs_type_destroy();
415
416}
417module_init(hyper_sysfs_init);
418module_exit(hyper_sysfs_exit);
419
420static ssize_t hyp_sysfs_show(struct kobject *kobj,
421 struct attribute *attr,
422 char *buffer)
423{
424 struct hyp_sysfs_attr *hyp_attr;
425 hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr);
426 if (hyp_attr->show)
427 return hyp_attr->show(hyp_attr, buffer);
428 return 0;
429}
430
431static ssize_t hyp_sysfs_store(struct kobject *kobj,
432 struct attribute *attr,
433 const char *buffer,
434 size_t len)
435{
436 struct hyp_sysfs_attr *hyp_attr;
437 hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr);
438 if (hyp_attr->store)
439 return hyp_attr->store(hyp_attr, buffer, len);
440 return 0;
441}
442
443static const struct sysfs_ops hyp_sysfs_ops = {
444 .show = hyp_sysfs_show,
445 .store = hyp_sysfs_store,
446};
447
448static struct kobj_type hyp_sysfs_kobj_type = {
449 .sysfs_ops = &hyp_sysfs_ops,
450};
451
452static int __init hypervisor_subsys_init(void)
453{
454 if (!xen_domain())
455 return -ENODEV;
456
457 hypervisor_kobj->ktype = &hyp_sysfs_kobj_type;
458 return 0;
459}
460device_initcall(hypervisor_subsys_init);
461
