drivers/xen/sys-hypervisor.c - kernel/common - Git at Google

 /*
  *  copyright (c) 2006 IBM Corporation
  *  Authored by: Mike D. Day <[email protected]>
  *
  *  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/slab.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/kobject.h>
 #include <linux/err.h>

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

 #include <xen/xen.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 const 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_fallback(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;
 }

 static ssize_t uuid_show(struct hyp_sysfs_attr *attr, char *buffer)
 {
 	xen_domain_handle_t uuid;
 	int ret;
 	ret = HYPERVISOR_xen_version(XENVER_guest_handle, uuid);
 	if (ret)
 		return uuid_show_fallback(attr, buffer);
 	ret = sprintf(buffer, "%pU\n", uuid);
 	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 const struct attribute_group xen_compilation_group = {
 	.name = "compilation",
 	.attrs = xen_compile_attrs,
 };

 static int __init 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, "%"PRI_xen_ulong"\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 const 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 const 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);
	/*
	* copyright (c) 2006 IBM Corporation
	* Authored by: Mike D. Day <[email protected]>
	*
	* 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/slab.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/kobject.h>
	#include <linux/err.h>

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

	#include <xen/xen.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 const 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_fallback(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;
	}

	static ssize_t uuid_show(struct hyp_sysfs_attr attr, char buffer)
	{
	xen_domain_handle_t uuid;
	int ret;
	ret = HYPERVISOR_xen_version(XENVER_guest_handle, uuid);
	if (ret)
	return uuid_show_fallback(attr, buffer);
	ret = sprintf(buffer, "%pU\n", uuid);
	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 const struct attribute_group xen_compilation_group = {
	.name = "compilation",
	.attrs = xen_compile_attrs,
	};

	static int __init 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, "%"PRI_xen_ulong"\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 const 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 const 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);