[deliverable/linux.git] / drivers / xen / sys-hypervisor.c

/*
 *  copyright (c) 2006 IBM Corporation
 *  Authored by: Mike D. Day <ncmike@us.ibm.com>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/kobject.h>

#include <asm/xen/hypervisor.h>
#include <asm/xen/hypercall.h>

#include <xen/xenbus.h>
#include <xen/interface/xen.h>
#include <xen/interface/version.h>

#define HYPERVISOR_ATTR_RO(_name) \
static struct hyp_sysfs_attr  _name##_attr = __ATTR_RO(_name)

#define HYPERVISOR_ATTR_RW(_name) \
static struct hyp_sysfs_attr _name##_attr = \
	__ATTR(_name, 0644, _name##_show, _name##_store)

struct hyp_sysfs_attr {
	struct attribute attr;
	ssize_t (*show)(struct hyp_sysfs_attr *, char *);
	ssize_t (*store)(struct hyp_sysfs_attr *, const char *, size_t);
	void *hyp_attr_data;
};

static ssize_t type_show(struct hyp_sysfs_attr *attr, char *buffer)
{
	return sprintf(buffer, "xen\n");
}

HYPERVISOR_ATTR_RO(type);

static int __init xen_sysfs_type_init(void)
{
	return sysfs_create_file(hypervisor_kobj, &type_attr.attr);
}

static void xen_sysfs_type_destroy(void)
{
	sysfs_remove_file(hypervisor_kobj, &type_attr.attr);
}

/* xen version attributes */
static ssize_t major_show(struct hyp_sysfs_attr *attr, char *buffer)
{
	int version = HYPERVISOR_xen_version(XENVER_version, NULL);
	if (version)
		return sprintf(buffer, "%d\n", version >> 16);
	return -ENODEV;
}

HYPERVISOR_ATTR_RO(major);

static ssize_t minor_show(struct hyp_sysfs_attr *attr, char *buffer)
{
	int version = HYPERVISOR_xen_version(XENVER_version, NULL);
	if (version)
		return sprintf(buffer, "%d\n", version & 0xff);
	return -ENODEV;
}

HYPERVISOR_ATTR_RO(minor);

static ssize_t extra_show(struct hyp_sysfs_attr *attr, char *buffer)
{
	int ret = -ENOMEM;
	char *extra;

	extra = kmalloc(XEN_EXTRAVERSION_LEN, GFP_KERNEL);
	if (extra) {
		ret = HYPERVISOR_xen_version(XENVER_extraversion, extra);
		if (!ret)
			ret = sprintf(buffer, "%s\n", extra);
		kfree(extra);
	}

	return ret;
}

HYPERVISOR_ATTR_RO(extra);

static struct attribute *version_attrs[] = {
	&major_attr.attr,
	&minor_attr.attr,
	&extra_attr.attr,
	NULL
};

static struct attribute_group version_group = {
	.name = "version",
	.attrs = version_attrs,
};

static int __init xen_sysfs_version_init(void)
{
	return sysfs_create_group(hypervisor_kobj, &version_group);
}

static void xen_sysfs_version_destroy(void)
{
	sysfs_remove_group(hypervisor_kobj, &version_group);
}

/* UUID */

static ssize_t uuid_show(struct hyp_sysfs_attr *attr, char *buffer)
{
	char *vm, *val;
	int ret;
	extern int xenstored_ready;

	if (!xenstored_ready)
		return -EBUSY;

	vm = xenbus_read(XBT_NIL, "vm", "", NULL);
	if (IS_ERR(vm))
		return PTR_ERR(vm);
	val = xenbus_read(XBT_NIL, vm, "uuid", NULL);
	kfree(vm);
	if (IS_ERR(val))
		return PTR_ERR(val);
	ret = sprintf(buffer, "%s\n", val);
	kfree(val);
	return ret;
}

HYPERVISOR_ATTR_RO(uuid);

static int __init xen_sysfs_uuid_init(void)
{
	return sysfs_create_file(hypervisor_kobj, &uuid_attr.attr);
}

static void xen_sysfs_uuid_destroy(void)
{
	sysfs_remove_file(hypervisor_kobj, &uuid_attr.attr);
}

/* xen compilation attributes */

static ssize_t compiler_show(struct hyp_sysfs_attr *attr, char *buffer)
{
	int ret = -ENOMEM;
	struct xen_compile_info *info;

	info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
	if (info) {
		ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
		if (!ret)
			ret = sprintf(buffer, "%s\n", info->compiler);
		kfree(info);
	}

	return ret;
}

HYPERVISOR_ATTR_RO(compiler);

static ssize_t compiled_by_show(struct hyp_sysfs_attr *attr, char *buffer)
{
	int ret = -ENOMEM;
	struct xen_compile_info *info;

	info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
	if (info) {
		ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
		if (!ret)
			ret = sprintf(buffer, "%s\n", info->compile_by);
		kfree(info);
	}

	return ret;
}

HYPERVISOR_ATTR_RO(compiled_by);

static ssize_t compile_date_show(struct hyp_sysfs_attr *attr, char *buffer)
{
	int ret = -ENOMEM;
	struct xen_compile_info *info;

	info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
	if (info) {
		ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
		if (!ret)
			ret = sprintf(buffer, "%s\n", info->compile_date);
		kfree(info);
	}

	return ret;
}

HYPERVISOR_ATTR_RO(compile_date);

static struct attribute *xen_compile_attrs[] = {
	&compiler_attr.attr,
	&compiled_by_attr.attr,
	&compile_date_attr.attr,
	NULL
};

static struct attribute_group xen_compilation_group = {
	.name = "compilation",
	.attrs = xen_compile_attrs,
};

int __init static xen_compilation_init(void)
{
	return sysfs_create_group(hypervisor_kobj, &xen_compilation_group);
}

static void xen_compilation_destroy(void)
{
	sysfs_remove_group(hypervisor_kobj, &xen_compilation_group);
}

/* xen properties info */

static ssize_t capabilities_show(struct hyp_sysfs_attr *attr, char *buffer)
{
	int ret = -ENOMEM;
	char *caps;

	caps = kmalloc(XEN_CAPABILITIES_INFO_LEN, GFP_KERNEL);
	if (caps) {
		ret = HYPERVISOR_xen_version(XENVER_capabilities, caps);
		if (!ret)
			ret = sprintf(buffer, "%s\n", caps);
		kfree(caps);
	}

	return ret;
}

HYPERVISOR_ATTR_RO(capabilities);

static ssize_t changeset_show(struct hyp_sysfs_attr *attr, char *buffer)
{
	int ret = -ENOMEM;
	char *cset;

	cset = kmalloc(XEN_CHANGESET_INFO_LEN, GFP_KERNEL);
	if (cset) {
		ret = HYPERVISOR_xen_version(XENVER_changeset, cset);
		if (!ret)
			ret = sprintf(buffer, "%s\n", cset);
		kfree(cset);
	}

	return ret;
}

HYPERVISOR_ATTR_RO(changeset);

static ssize_t virtual_start_show(struct hyp_sysfs_attr *attr, char *buffer)
{
	int ret = -ENOMEM;
	struct xen_platform_parameters *parms;

	parms = kmalloc(sizeof(struct xen_platform_parameters), GFP_KERNEL);
	if (parms) {
		ret = HYPERVISOR_xen_version(XENVER_platform_parameters,
					     parms);
		if (!ret)
			ret = sprintf(buffer, "%lx\n", parms->virt_start);
		kfree(parms);
	}

	return ret;
}

HYPERVISOR_ATTR_RO(virtual_start);

static ssize_t pagesize_show(struct hyp_sysfs_attr *attr, char *buffer)
{
	int ret;

	ret = HYPERVISOR_xen_version(XENVER_pagesize, NULL);
	if (ret > 0)
		ret = sprintf(buffer, "%x\n", ret);

	return ret;
}

HYPERVISOR_ATTR_RO(pagesize);

static ssize_t xen_feature_show(int index, char *buffer)
{
	ssize_t ret;
	struct xen_feature_info info;

	info.submap_idx = index;
	ret = HYPERVISOR_xen_version(XENVER_get_features, &info);
	if (!ret)
		ret = sprintf(buffer, "%08x", info.submap);

	return ret;
}

static ssize_t features_show(struct hyp_sysfs_attr *attr, char *buffer)
{
	ssize_t len;
	int i;

	len = 0;
	for (i = XENFEAT_NR_SUBMAPS-1; i >= 0; i--) {
		int ret = xen_feature_show(i, buffer + len);
		if (ret < 0) {
			if (len == 0)
				len = ret;
			break;
		}
		len += ret;
	}
	if (len > 0)
		buffer[len++] = '\n';

	return len;
}

HYPERVISOR_ATTR_RO(features);

static struct attribute *xen_properties_attrs[] = {
	&capabilities_attr.attr,
	&changeset_attr.attr,
	&virtual_start_attr.attr,
	&pagesize_attr.attr,
	&features_attr.attr,
	NULL
};

static struct attribute_group xen_properties_group = {
	.name = "properties",
	.attrs = xen_properties_attrs,
};

static int __init xen_properties_init(void)
{
	return sysfs_create_group(hypervisor_kobj, &xen_properties_group);
}

static void xen_properties_destroy(void)
{
	sysfs_remove_group(hypervisor_kobj, &xen_properties_group);
}

static int __init hyper_sysfs_init(void)
{
	int ret;

	if (!xen_domain())
		return -ENODEV;

	ret = xen_sysfs_type_init();
	if (ret)
		goto out;
	ret = xen_sysfs_version_init();
	if (ret)
		goto version_out;
	ret = xen_compilation_init();
	if (ret)
		goto comp_out;
	ret = xen_sysfs_uuid_init();
	if (ret)
		goto uuid_out;
	ret = xen_properties_init();
	if (ret)
		goto prop_out;

	goto out;

prop_out:
	xen_sysfs_uuid_destroy();
uuid_out:
	xen_compilation_destroy();
comp_out:
	xen_sysfs_version_destroy();
version_out:
	xen_sysfs_type_destroy();
out:
	return ret;
}

static void __exit hyper_sysfs_exit(void)
{
	xen_properties_destroy();
	xen_compilation_destroy();
	xen_sysfs_uuid_destroy();
	xen_sysfs_version_destroy();
	xen_sysfs_type_destroy();

}
module_init(hyper_sysfs_init);
module_exit(hyper_sysfs_exit);

static ssize_t hyp_sysfs_show(struct kobject *kobj,
			      struct attribute *attr,
			      char *buffer)
{
	struct hyp_sysfs_attr *hyp_attr;
	hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr);
	if (hyp_attr->show)
		return hyp_attr->show(hyp_attr, buffer);
	return 0;
}

static ssize_t hyp_sysfs_store(struct kobject *kobj,
			       struct attribute *attr,
			       const char *buffer,
			       size_t len)
{
	struct hyp_sysfs_attr *hyp_attr;
	hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr);
	if (hyp_attr->store)
		return hyp_attr->store(hyp_attr, buffer, len);
	return 0;
}

static struct sysfs_ops hyp_sysfs_ops = {
	.show = hyp_sysfs_show,
	.store = hyp_sysfs_store,
};

static struct kobj_type hyp_sysfs_kobj_type = {
	.sysfs_ops = &hyp_sysfs_ops,
};

static int __init hypervisor_subsys_init(void)
{
	if (!xen_domain())
		return -ENODEV;

	hypervisor_kobj->ktype = &hyp_sysfs_kobj_type;
	return 0;
}
device_initcall(hypervisor_subsys_init);
Commit	Line	Data
cff7e81b JF	1	/*
	2	* copyright (c) 2006 IBM Corporation
	3	* Authored by: Mike D. Day <ncmike@us.ibm.com>
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License version 2 as
	7	* published by the Free Software Foundation.
	8	*/
	9
	10	#include <linux/kernel.h>
	11	#include <linux/module.h>
	12	#include <linux/kobject.h>
	13
	14	#include <asm/xen/hypervisor.h>
	15	#include <asm/xen/hypercall.h>
	16
	17	#include <xen/xenbus.h>
	18	#include <xen/interface/xen.h>
	19	#include <xen/interface/version.h>
	20
	21	#define HYPERVISOR_ATTR_RO(_name) \
	22	static struct hyp_sysfs_attr _name##_attr = __ATTR_RO(_name)
	23
	24	#define HYPERVISOR_ATTR_RW(_name) \
	25	static struct hyp_sysfs_attr _name##_attr = \
	26	__ATTR(_name, 0644, _name##_show, _name##_store)
	27
	28	struct hyp_sysfs_attr {
	29	struct attribute attr;
	30	ssize_t (show)(struct hyp_sysfs_attr , char *);
	31	ssize_t (store)(struct hyp_sysfs_attr , const char *, size_t);
	32	void *hyp_attr_data;
	33	};
	34
	35	static ssize_t type_show(struct hyp_sysfs_attr attr, char buffer)
	36	{
	37	return sprintf(buffer, "xen\n");
	38	}
	39
	40	HYPERVISOR_ATTR_RO(type);
	41
	42	static int __init xen_sysfs_type_init(void)
	43	{
	44	return sysfs_create_file(hypervisor_kobj, &type_attr.attr);
	45	}
	46
	47	static void xen_sysfs_type_destroy(void)
	48	{
	49	sysfs_remove_file(hypervisor_kobj, &type_attr.attr);
	50	}
	51
	52	/* xen version attributes */
	53	static ssize_t major_show(struct hyp_sysfs_attr attr, char buffer)
	54	{
	55	int version = HYPERVISOR_xen_version(XENVER_version, NULL);
	56	if (version)
	57	return sprintf(buffer, "%d\n", version >> 16);
	58	return -ENODEV;
	59	}
	60
	61	HYPERVISOR_ATTR_RO(major);
	62
	63	static ssize_t minor_show(struct hyp_sysfs_attr attr, char buffer)
	64	{
65	int version = HYPERVISOR_xen_version(XENVER_version, NULL);
66	if (version)
67	return sprintf(buffer, "%d\n", version & 0xff);
68	return -ENODEV;
69	}
70
71	HYPERVISOR_ATTR_RO(minor);
72
73	static ssize_t extra_show(struct hyp_sysfs_attr attr, char buffer)
74	{
75	int ret = -ENOMEM;
76	char *extra;
77
78	extra = kmalloc(XEN_EXTRAVERSION_LEN, GFP_KERNEL);
79	if (extra) {
80	ret = HYPERVISOR_xen_version(XENVER_extraversion, extra);
81	if (!ret)
82	ret = sprintf(buffer, "%s\n", extra);
83	kfree(extra);
84	}
85
86	return ret;
87	}
88
89	HYPERVISOR_ATTR_RO(extra);
90
91	static struct attribute *version_attrs[] = {
92	&major_attr.attr,
93	&minor_attr.attr,
94	&extra_attr.attr,
95	NULL
96	};
97
98	static struct attribute_group version_group = {
99	.name = "version",
100	.attrs = version_attrs,
101	};
102
103	static int __init xen_sysfs_version_init(void)
104	{
105	return sysfs_create_group(hypervisor_kobj, &version_group);
106	}
107
108	static void xen_sysfs_version_destroy(void)
109	{
110	sysfs_remove_group(hypervisor_kobj, &version_group);
111	}
112
113	/* UUID */
114
115	static ssize_t uuid_show(struct hyp_sysfs_attr attr, char buffer)
116	{
117	char vm, val;
118	int ret;
119	extern int xenstored_ready;
120
121	if (!xenstored_ready)
122	return -EBUSY;
123
124	vm = xenbus_read(XBT_NIL, "vm", "", NULL);
125	if (IS_ERR(vm))
126	return PTR_ERR(vm);
127	val = xenbus_read(XBT_NIL, vm, "uuid", NULL);
128	kfree(vm);
129	if (IS_ERR(val))
130	return PTR_ERR(val);
131	ret = sprintf(buffer, "%s\n", val);
132	kfree(val);
133	return ret;
134	}
135
136	HYPERVISOR_ATTR_RO(uuid);
137
138	static int __init xen_sysfs_uuid_init(void)
139	{
140	return sysfs_create_file(hypervisor_kobj, &uuid_attr.attr);
141	}
142
143	static void xen_sysfs_uuid_destroy(void)
144	{
145	sysfs_remove_file(hypervisor_kobj, &uuid_attr.attr);
146	}
147
148	/* xen compilation attributes */
149
150	static ssize_t compiler_show(struct hyp_sysfs_attr attr, char buffer)
151	{
152	int ret = -ENOMEM;
153	struct xen_compile_info *info;
154
155	info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
156	if (info) {
157	ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
158	if (!ret)
159	ret = sprintf(buffer, "%s\n", info->compiler);
160	kfree(info);
161	}
162
163	return ret;
164	}
165
166	HYPERVISOR_ATTR_RO(compiler);
167
168	static ssize_t compiled_by_show(struct hyp_sysfs_attr attr, char buffer)
169	{
170	int ret = -ENOMEM;
171	struct xen_compile_info *info;
172
173	info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
174	if (info) {
175	ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
176	if (!ret)
177	ret = sprintf(buffer, "%s\n", info->compile_by);
178	kfree(info);
179	}
180
181	return ret;
182	}
183
184	HYPERVISOR_ATTR_RO(compiled_by);
185
186	static ssize_t compile_date_show(struct hyp_sysfs_attr attr, char buffer)
187	{
188	int ret = -ENOMEM;
189	struct xen_compile_info *info;
190
191	info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
192	if (info) {
193	ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
194	if (!ret)
195	ret = sprintf(buffer, "%s\n", info->compile_date);
196	kfree(info);
197	}
198
199	return ret;
200	}
201
202	HYPERVISOR_ATTR_RO(compile_date);
203
204	static struct attribute *xen_compile_attrs[] = {
205	&compiler_attr.attr,
206	&compiled_by_attr.attr,
207	&compile_date_attr.attr,
208	NULL
209	};
210
211	static struct attribute_group xen_compilation_group = {
212	.name = "compilation",
213	.attrs = xen_compile_attrs,
214	};
215
216	int __init static xen_compilation_init(void)
217	{
218	return sysfs_create_group(hypervisor_kobj, &xen_compilation_group);
219	}
220
221	static void xen_compilation_destroy(void)
222	{
223	sysfs_remove_group(hypervisor_kobj, &xen_compilation_group);
224	}
225
226	/* xen properties info */
227
228	static ssize_t capabilities_show(struct hyp_sysfs_attr attr, char buffer)
229	{
230	int ret = -ENOMEM;
231	char *caps;
232
233	caps = kmalloc(XEN_CAPABILITIES_INFO_LEN, GFP_KERNEL);
234	if (caps) {
235	ret = HYPERVISOR_xen_version(XENVER_capabilities, caps);
236	if (!ret)
237	ret = sprintf(buffer, "%s\n", caps);
238	kfree(caps);
239	}
240
241	return ret;
242	}
243
244	HYPERVISOR_ATTR_RO(capabilities);
245
246	static ssize_t changeset_show(struct hyp_sysfs_attr attr, char buffer)
247	{
248	int ret = -ENOMEM;
249	char *cset;
250
251	cset = kmalloc(XEN_CHANGESET_INFO_LEN, GFP_KERNEL);
252	if (cset) {
253	ret = HYPERVISOR_xen_version(XENVER_changeset, cset);
254	if (!ret)
255	ret = sprintf(buffer, "%s\n", cset);
256	kfree(cset);
257	}
258
259	return ret;
260	}
261
262	HYPERVISOR_ATTR_RO(changeset);
263
264	static ssize_t virtual_start_show(struct hyp_sysfs_attr attr, char buffer)
265	{
266	int ret = -ENOMEM;
267	struct xen_platform_parameters *parms;
268
269	parms = kmalloc(sizeof(struct xen_platform_parameters), GFP_KERNEL);
270	if (parms) {
271	ret = HYPERVISOR_xen_version(XENVER_platform_parameters,
272	parms);
273	if (!ret)
274	ret = sprintf(buffer, "%lx\n", parms->virt_start);
275	kfree(parms);
276	}
277
278	return ret;
279	}
280
281	HYPERVISOR_ATTR_RO(virtual_start);
282
283	static ssize_t pagesize_show(struct hyp_sysfs_attr attr, char buffer)
284	{
285	int ret;
286
287	ret = HYPERVISOR_xen_version(XENVER_pagesize, NULL);
288	if (ret > 0)
289	ret = sprintf(buffer, "%x\n", ret);
290
291	return ret;
292	}
293
294	HYPERVISOR_ATTR_RO(pagesize);
295
cff7e81b JF	296	static ssize_t xen_feature_show(int index, char *buffer)
cff7e81b JF	297	{
a649b720 JF	298	ssize_t ret;
a649b720 JF	299	struct xen_feature_info info;
cff7e81b	300
a649b720 JF	301	info.submap_idx = index;
	302	ret = HYPERVISOR_xen_version(XENVER_get_features, &info);
	303	if (!ret)
	304	ret = sprintf(buffer, "%08x", info.submap);
cff7e81b JF	305
	306	return ret;
	307	}
	308
a649b720	309	static ssize_t features_show(struct hyp_sysfs_attr attr, char buffer)
cff7e81b	310	{
a649b720 JF	311	ssize_t len;
	312	int i;
	313
	314	len = 0;
	315	for (i = XENFEAT_NR_SUBMAPS-1; i >= 0; i--) {
	316	int ret = xen_feature_show(i, buffer + len);
	317	if (ret < 0) {
	318	if (len == 0)
	319	len = ret;
	320	break;
	321	}
	322	len += ret;
	323	}
	324	if (len > 0)
	325	buffer[len++] = '\n';
	326
	327	return len;
cff7e81b JF	328	}
cff7e81b JF	329
a649b720	330	HYPERVISOR_ATTR_RO(features);
cff7e81b JF	331
	332	static struct attribute *xen_properties_attrs[] = {
	333	&capabilities_attr.attr,
	334	&changeset_attr.attr,
	335	&virtual_start_attr.attr,
	336	&pagesize_attr.attr,
a649b720	337	&features_attr.attr,
cff7e81b JF	338	NULL
	339	};
	340
	341	static struct attribute_group xen_properties_group = {
	342	.name = "properties",
	343	.attrs = xen_properties_attrs,
	344	};
	345
	346	static int __init xen_properties_init(void)
	347	{
	348	return sysfs_create_group(hypervisor_kobj, &xen_properties_group);
	349	}
	350
	351	static void xen_properties_destroy(void)
	352	{
	353	sysfs_remove_group(hypervisor_kobj, &xen_properties_group);
	354	}
	355
cff7e81b JF	356	static int __init hyper_sysfs_init(void)
	357	{
	358	int ret;
	359
	360	if (!xen_domain())
	361	return -ENODEV;
	362
	363	ret = xen_sysfs_type_init();
	364	if (ret)
	365	goto out;
	366	ret = xen_sysfs_version_init();
	367	if (ret)
	368	goto version_out;
	369	ret = xen_compilation_init();
	370	if (ret)
	371	goto comp_out;
	372	ret = xen_sysfs_uuid_init();
	373	if (ret)
	374	goto uuid_out;
	375	ret = xen_properties_init();
	376	if (ret)
	377	goto prop_out;
cff7e81b JF	378
	379	goto out;
	380
cff7e81b JF	381	prop_out:
	382	xen_sysfs_uuid_destroy();
	383	uuid_out:
	384	xen_compilation_destroy();
	385	comp_out:
	386	xen_sysfs_version_destroy();
	387	version_out:
	388	xen_sysfs_type_destroy();
	389	out:
	390	return ret;
	391	}
	392
	393	static void __exit hyper_sysfs_exit(void)
	394	{
cff7e81b JF	395	xen_properties_destroy();
	396	xen_compilation_destroy();
	397	xen_sysfs_uuid_destroy();
	398	xen_sysfs_version_destroy();
	399	xen_sysfs_type_destroy();
	400
	401	}
	402	module_init(hyper_sysfs_init);
	403	module_exit(hyper_sysfs_exit);
	404
	405	static ssize_t hyp_sysfs_show(struct kobject *kobj,
	406	struct attribute *attr,
	407	char *buffer)
	408	{
	409	struct hyp_sysfs_attr *hyp_attr;
	410	hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr);
	411	if (hyp_attr->show)
	412	return hyp_attr->show(hyp_attr, buffer);
	413	return 0;
	414	}
	415
	416	static ssize_t hyp_sysfs_store(struct kobject *kobj,
	417	struct attribute *attr,
	418	const char *buffer,
	419	size_t len)
	420	{
	421	struct hyp_sysfs_attr *hyp_attr;
	422	hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr);
	423	if (hyp_attr->store)
	424	return hyp_attr->store(hyp_attr, buffer, len);
	425	return 0;
	426	}
	427
	428	static struct sysfs_ops hyp_sysfs_ops = {
	429	.show = hyp_sysfs_show,
	430	.store = hyp_sysfs_store,
	431	};
	432
	433	static struct kobj_type hyp_sysfs_kobj_type = {
	434	.sysfs_ops = &hyp_sysfs_ops,
	435	};
	436
	437	static int __init hypervisor_subsys_init(void)
	438	{
	439	if (!xen_domain())
	440	return -ENODEV;
	441
	442	hypervisor_kobj->ktype = &hyp_sysfs_kobj_type;
	443	return 0;
	444	}
	445	device_initcall(hypervisor_subsys_init);