[mirror_ubuntu-focal-kernel.git] / drivers / xen / sys-hypervisor.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  copyright (c) 2006 IBM Corporation
 *  Authored by: Mike D. Day <ncmike@us.ibm.com>
 */

#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/init.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>
#ifdef CONFIG_XEN_HAVE_VPMU
#include <xen/interface/xenpmu.h>
#endif

#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 ssize_t guest_type_show(struct hyp_sysfs_attr *attr, char *buffer)
{
	const char *type;

	switch (xen_domain_type) {
	case XEN_NATIVE:
		/* ARM only. */
		type = "Xen";
		break;
	case XEN_PV_DOMAIN:
		type = "PV";
		break;
	case XEN_HVM_DOMAIN:
		type = xen_pvh_domain() ? "PVH" : "HVM";
		break;
	default:
		return -EINVAL;
	}

	return sprintf(buffer, "%s\n", type);
}

HYPERVISOR_ATTR_RO(guest_type);

static int __init xen_sysfs_guest_type_init(void)
{
	return sysfs_create_file(hypervisor_kobj, &guest_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);
}

/* 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);
}

/* 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_sysfs_compilation_init(void)
{
	return sysfs_create_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 ssize_t buildid_show(struct hyp_sysfs_attr *attr, char *buffer)
{
	ssize_t ret;
	struct xen_build_id *buildid;

	ret = HYPERVISOR_xen_version(XENVER_build_id, NULL);
	if (ret < 0) {
		if (ret == -EPERM)
			ret = sprintf(buffer, "<denied>");
		return ret;
	}

	buildid = kmalloc(sizeof(*buildid) + ret, GFP_KERNEL);
	if (!buildid)
		return -ENOMEM;

	buildid->len = ret;
	ret = HYPERVISOR_xen_version(XENVER_build_id, buildid);
	if (ret > 0)
		ret = sprintf(buffer, "%s", buildid->buf);
	kfree(buildid);

	return ret;
}

HYPERVISOR_ATTR_RO(buildid);

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

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

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

#ifdef CONFIG_XEN_HAVE_VPMU
struct pmu_mode {
	const char *name;
	uint32_t mode;
};

static struct pmu_mode pmu_modes[] = {
	{"off", XENPMU_MODE_OFF},
	{"self", XENPMU_MODE_SELF},
	{"hv", XENPMU_MODE_HV},
	{"all", XENPMU_MODE_ALL}
};

static ssize_t pmu_mode_store(struct hyp_sysfs_attr *attr,
			      const char *buffer, size_t len)
{
	int ret;
	struct xen_pmu_params xp;
	int i;

	for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) {
		if (strncmp(buffer, pmu_modes[i].name, len - 1) == 0) {
			xp.val = pmu_modes[i].mode;
			break;
		}
	}

	if (i == ARRAY_SIZE(pmu_modes))
		return -EINVAL;

	xp.version.maj = XENPMU_VER_MAJ;
	xp.version.min = XENPMU_VER_MIN;
	ret = HYPERVISOR_xenpmu_op(XENPMU_mode_set, &xp);
	if (ret)
		return ret;

	return len;
}

static ssize_t pmu_mode_show(struct hyp_sysfs_attr *attr, char *buffer)
{
	int ret;
	struct xen_pmu_params xp;
	int i;
	uint32_t mode;

	xp.version.maj = XENPMU_VER_MAJ;
	xp.version.min = XENPMU_VER_MIN;
	ret = HYPERVISOR_xenpmu_op(XENPMU_mode_get, &xp);
	if (ret)
		return ret;

	mode = (uint32_t)xp.val;
	for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) {
		if (mode == pmu_modes[i].mode)
			return sprintf(buffer, "%s\n", pmu_modes[i].name);
	}

	return -EINVAL;
}
HYPERVISOR_ATTR_RW(pmu_mode);

static ssize_t pmu_features_store(struct hyp_sysfs_attr *attr,
				  const char *buffer, size_t len)
{
	int ret;
	uint32_t features;
	struct xen_pmu_params xp;

	ret = kstrtou32(buffer, 0, &features);
	if (ret)
		return ret;

	xp.val = features;
	xp.version.maj = XENPMU_VER_MAJ;
	xp.version.min = XENPMU_VER_MIN;
	ret = HYPERVISOR_xenpmu_op(XENPMU_feature_set, &xp);
	if (ret)
		return ret;

	return len;
}

static ssize_t pmu_features_show(struct hyp_sysfs_attr *attr, char *buffer)
{
	int ret;
	struct xen_pmu_params xp;

	xp.version.maj = XENPMU_VER_MAJ;
	xp.version.min = XENPMU_VER_MIN;
	ret = HYPERVISOR_xenpmu_op(XENPMU_feature_get, &xp);
	if (ret)
		return ret;

	return sprintf(buffer, "0x%x\n", (uint32_t)xp.val);
}
HYPERVISOR_ATTR_RW(pmu_features);

static struct attribute *xen_pmu_attrs[] = {
	&pmu_mode_attr.attr,
	&pmu_features_attr.attr,
	NULL
};

static const struct attribute_group xen_pmu_group = {
	.name = "pmu",
	.attrs = xen_pmu_attrs,
};

static int __init xen_sysfs_pmu_init(void)
{
	return sysfs_create_group(hypervisor_kobj, &xen_pmu_group);
}
#endif

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_guest_type_init();
	if (ret)
		goto guest_type_out;
	ret = xen_sysfs_version_init();
	if (ret)
		goto version_out;
	ret = xen_sysfs_compilation_init();
	if (ret)
		goto comp_out;
	ret = xen_sysfs_uuid_init();
	if (ret)
		goto uuid_out;
	ret = xen_sysfs_properties_init();
	if (ret)
		goto prop_out;
#ifdef CONFIG_XEN_HAVE_VPMU
	if (xen_initial_domain()) {
		ret = xen_sysfs_pmu_init();
		if (ret) {
			sysfs_remove_group(hypervisor_kobj,
					   &xen_properties_group);
			goto prop_out;
		}
	}
#endif
	goto out;

prop_out:
	sysfs_remove_file(hypervisor_kobj, &uuid_attr.attr);
uuid_out:
	sysfs_remove_group(hypervisor_kobj, &xen_compilation_group);
comp_out:
	sysfs_remove_group(hypervisor_kobj, &version_group);
version_out:
	sysfs_remove_file(hypervisor_kobj, &guest_type_attr.attr);
guest_type_out:
	sysfs_remove_file(hypervisor_kobj, &type_attr.attr);
out:
	return ret;
}
device_initcall(hyper_sysfs_init);

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);
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
cff7e81b JF	2	/*
	3	* copyright (c) 2006 IBM Corporation
	4	* Authored by: Mike D. Day <ncmike@us.ibm.com>
cff7e81b JF	5	*/
cff7e81b JF	6
5a0e3ad6	7	#include <linux/slab.h>
cff7e81b	8	#include <linux/kernel.h>
46894f17	9	#include <linux/init.h>
cff7e81b	10	#include <linux/kobject.h>
609b0b8c	11	#include <linux/err.h>
cff7e81b JF	12
	13	#include <asm/xen/hypervisor.h>
	14	#include <asm/xen/hypercall.h>
	15
1ccbf534	16	#include <xen/xen.h>
cff7e81b JF	17	#include <xen/xenbus.h>
	18	#include <xen/interface/xen.h>
	19	#include <xen/interface/version.h>
5f141548 BO	20	#ifdef CONFIG_XEN_HAVE_VPMU
	21	#include <xen/interface/xenpmu.h>
	22	#endif
cff7e81b JF	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 = \
	29	__ATTR(_name, 0644, _name##_show, _name##_store)
	30
	31	struct 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
	38	static ssize_t type_show(struct hyp_sysfs_attr attr, char buffer)
	39	{
	40	return sprintf(buffer, "xen\n");
	41	}
	42
	43	HYPERVISOR_ATTR_RO(type);
	44
	45	static int __init xen_sysfs_type_init(void)
	46	{
	47	return sysfs_create_file(hypervisor_kobj, &type_attr.attr);
	48	}
	49
4a4c29c9 JG	50	static ssize_t guest_type_show(struct hyp_sysfs_attr attr, char buffer)
	51	{
	52	const char *type;
	53
	54	switch (xen_domain_type) {
	55	case XEN_NATIVE:
	56	/* ARM only. */
	57	type = "Xen";
	58	break;
	59	case XEN_PV_DOMAIN:
	60	type = "PV";
	61	break;
	62	case XEN_HVM_DOMAIN:
	63	type = xen_pvh_domain() ? "PVH" : "HVM";
	64	break;
	65	default:
	66	return -EINVAL;
	67	}
	68
	69	return sprintf(buffer, "%s\n", type);
	70	}
	71
	72	HYPERVISOR_ATTR_RO(guest_type);
	73
	74	static int __init xen_sysfs_guest_type_init(void)
	75	{
	76	return sysfs_create_file(hypervisor_kobj, &guest_type_attr.attr);
	77	}
	78
cff7e81b JF	79	/* xen version attributes */
	80	static ssize_t major_show(struct hyp_sysfs_attr attr, char buffer)
	81	{
	82	int version = HYPERVISOR_xen_version(XENVER_version, NULL);
	83	if (version)
	84	return sprintf(buffer, "%d\n", version >> 16);
	85	return -ENODEV;
	86	}
	87
	88	HYPERVISOR_ATTR_RO(major);
	89
	90	static ssize_t minor_show(struct hyp_sysfs_attr attr, char buffer)
	91	{
	92	int version = HYPERVISOR_xen_version(XENVER_version, NULL);
	93	if (version)
	94	return sprintf(buffer, "%d\n", version & 0xff);
	95	return -ENODEV;
	96	}
	97
	98	HYPERVISOR_ATTR_RO(minor);
	99
	100	static ssize_t extra_show(struct hyp_sysfs_attr attr, char buffer)
	101	{
	102	int ret = -ENOMEM;
	103	char *extra;
	104
	105	extra = kmalloc(XEN_EXTRAVERSION_LEN, GFP_KERNEL);
	106	if (extra) {
	107	ret = HYPERVISOR_xen_version(XENVER_extraversion, extra);
	108	if (!ret)
	109	ret = sprintf(buffer, "%s\n", extra);
	110	kfree(extra);
	111	}
	112
	113	return ret;
	114	}
	115
	116	HYPERVISOR_ATTR_RO(extra);
	117
	118	static struct attribute *version_attrs[] = {
	119	&major_attr.attr,
	120	&minor_attr.attr,
	121	&extra_attr.attr,
	122	NULL
	123	};
	124
ead1d014	125	static const struct attribute_group version_group = {
cff7e81b JF	126	.name = "version",
	127	.attrs = version_attrs,
	128	};
	129
	130	static int __init xen_sysfs_version_init(void)
	131	{
	132	return sysfs_create_group(hypervisor_kobj, &version_group);
	133	}
	134
cff7e81b JF	135	/* UUID */
cff7e81b JF	136
5c13f806	137	static ssize_t uuid_show_fallback(struct hyp_sysfs_attr attr, char buffer)
cff7e81b JF	138	{
	139	char vm, val;
	140	int ret;
	141	extern int xenstored_ready;
	142
	143	if (!xenstored_ready)
	144	return -EBUSY;
	145
	146	vm = xenbus_read(XBT_NIL, "vm", "", NULL);
	147	if (IS_ERR(vm))
	148	return PTR_ERR(vm);
	149	val = xenbus_read(XBT_NIL, vm, "uuid", NULL);
	150	kfree(vm);
	151	if (IS_ERR(val))
	152	return PTR_ERR(val);
	153	ret = sprintf(buffer, "%s\n", val);
	154	kfree(val);
	155	return ret;
	156	}
	157
5c13f806 DDG	158	static ssize_t uuid_show(struct hyp_sysfs_attr attr, char buffer)
	159	{
	160	xen_domain_handle_t uuid;
	161	int ret;
	162	ret = HYPERVISOR_xen_version(XENVER_guest_handle, uuid);
	163	if (ret)
	164	return uuid_show_fallback(attr, buffer);
	165	ret = sprintf(buffer, "%pU\n", uuid);
	166	return ret;
	167	}
	168
cff7e81b JF	169	HYPERVISOR_ATTR_RO(uuid);
	170
	171	static int __init xen_sysfs_uuid_init(void)
	172	{
	173	return sysfs_create_file(hypervisor_kobj, &uuid_attr.attr);
	174	}
	175
cff7e81b JF	176	/* xen compilation attributes */
	177
	178	static ssize_t compiler_show(struct hyp_sysfs_attr attr, char buffer)
	179	{
	180	int ret = -ENOMEM;
	181	struct xen_compile_info *info;
	182
	183	info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
	184	if (info) {
	185	ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
	186	if (!ret)
	187	ret = sprintf(buffer, "%s\n", info->compiler);
	188	kfree(info);
	189	}
	190
	191	return ret;
	192	}
	193
	194	HYPERVISOR_ATTR_RO(compiler);
	195
	196	static ssize_t compiled_by_show(struct hyp_sysfs_attr attr, char buffer)
	197	{
	198	int ret = -ENOMEM;
	199	struct xen_compile_info *info;
	200
	201	info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
	202	if (info) {
	203	ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
	204	if (!ret)
	205	ret = sprintf(buffer, "%s\n", info->compile_by);
	206	kfree(info);
	207	}
	208
	209	return ret;
	210	}
	211
	212	HYPERVISOR_ATTR_RO(compiled_by);
	213
	214	static ssize_t compile_date_show(struct hyp_sysfs_attr attr, char buffer)
	215	{
	216	int ret = -ENOMEM;
	217	struct xen_compile_info *info;
	218
	219	info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
	220	if (info) {
	221	ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
	222	if (!ret)
	223	ret = sprintf(buffer, "%s\n", info->compile_date);
	224	kfree(info);
	225	}
	226
	227	return ret;
	228	}
	229
	230	HYPERVISOR_ATTR_RO(compile_date);
	231
	232	static struct attribute *xen_compile_attrs[] = {
	233	&compiler_attr.attr,
	234	&compiled_by_attr.attr,
	235	&compile_date_attr.attr,
	236	NULL
	237	};
	238
ead1d014	239	static const struct attribute_group xen_compilation_group = {
cff7e81b JF	240	.name = "compilation",
	241	.attrs = xen_compile_attrs,
	242	};
	243
5b00b504	244	static int __init xen_sysfs_compilation_init(void)
cff7e81b JF	245	{
	246	return sysfs_create_group(hypervisor_kobj, &xen_compilation_group);
	247	}
	248
cff7e81b JF	249	/* xen properties info */
	250
	251	static ssize_t capabilities_show(struct hyp_sysfs_attr attr, char buffer)
	252	{
	253	int ret = -ENOMEM;
	254	char *caps;
	255
	256	caps = kmalloc(XEN_CAPABILITIES_INFO_LEN, GFP_KERNEL);
	257	if (caps) {
	258	ret = HYPERVISOR_xen_version(XENVER_capabilities, caps);
	259	if (!ret)
	260	ret = sprintf(buffer, "%s\n", caps);
	261	kfree(caps);
	262	}
	263
	264	return ret;
	265	}
	266
	267	HYPERVISOR_ATTR_RO(capabilities);
	268
	269	static ssize_t changeset_show(struct hyp_sysfs_attr attr, char buffer)
	270	{
	271	int ret = -ENOMEM;
	272	char *cset;
	273
	274	cset = kmalloc(XEN_CHANGESET_INFO_LEN, GFP_KERNEL);
	275	if (cset) {
	276	ret = HYPERVISOR_xen_version(XENVER_changeset, cset);
	277	if (!ret)
	278	ret = sprintf(buffer, "%s\n", cset);
	279	kfree(cset);
	280	}
	281
	282	return ret;
	283	}
	284
	285	HYPERVISOR_ATTR_RO(changeset);
	286
	287	static ssize_t virtual_start_show(struct hyp_sysfs_attr attr, char buffer)
	288	{
	289	int ret = -ENOMEM;
	290	struct xen_platform_parameters *parms;
	291
	292	parms = kmalloc(sizeof(struct xen_platform_parameters), GFP_KERNEL);
	293	if (parms) {
	294	ret = HYPERVISOR_xen_version(XENVER_platform_parameters,
	295	parms);
	296	if (!ret)
37ea0fcb IC	297	ret = sprintf(buffer, "%"PRI_xen_ulong"\n",
37ea0fcb IC	298	parms->virt_start);
cff7e81b JF	299	kfree(parms);
	300	}
	301
	302	return ret;
	303	}
	304
	305	HYPERVISOR_ATTR_RO(virtual_start);
	306
	307	static ssize_t pagesize_show(struct hyp_sysfs_attr attr, char buffer)
	308	{
	309	int ret;
	310
	311	ret = HYPERVISOR_xen_version(XENVER_pagesize, NULL);
	312	if (ret > 0)
	313	ret = sprintf(buffer, "%x\n", ret);
	314
	315	return ret;
	316	}
	317
	318	HYPERVISOR_ATTR_RO(pagesize);
	319
cff7e81b JF	320	static ssize_t xen_feature_show(int index, char *buffer)
cff7e81b JF	321	{
a649b720 JF	322	ssize_t ret;
a649b720 JF	323	struct xen_feature_info info;
cff7e81b	324
a649b720 JF	325	info.submap_idx = index;
	326	ret = HYPERVISOR_xen_version(XENVER_get_features, &info);
	327	if (!ret)
	328	ret = sprintf(buffer, "%08x", info.submap);
cff7e81b JF	329
	330	return ret;
	331	}
	332
a649b720	333	static ssize_t features_show(struct hyp_sysfs_attr attr, char buffer)
cff7e81b	334	{
a649b720 JF	335	ssize_t len;
	336	int i;
	337
	338	len = 0;
	339	for (i = XENFEAT_NR_SUBMAPS-1; i >= 0; i--) {
	340	int ret = xen_feature_show(i, buffer + len);
	341	if (ret < 0) {
	342	if (len == 0)
	343	len = ret;
	344	break;
	345	}
	346	len += ret;
	347	}
	348	if (len > 0)
	349	buffer[len++] = '\n';
	350
	351	return len;
cff7e81b JF	352	}
cff7e81b JF	353
a649b720	354	HYPERVISOR_ATTR_RO(features);
cff7e81b	355
84b76257 JG	356	static ssize_t buildid_show(struct hyp_sysfs_attr attr, char buffer)
	357	{
	358	ssize_t ret;
	359	struct xen_build_id *buildid;
	360
	361	ret = HYPERVISOR_xen_version(XENVER_build_id, NULL);
	362	if (ret < 0) {
	363	if (ret == -EPERM)
	364	ret = sprintf(buffer, "<denied>");
	365	return ret;
	366	}
	367
	368	buildid = kmalloc(sizeof(*buildid) + ret, GFP_KERNEL);
	369	if (!buildid)
	370	return -ENOMEM;
	371
	372	buildid->len = ret;
	373	ret = HYPERVISOR_xen_version(XENVER_build_id, buildid);
	374	if (ret > 0)
	375	ret = sprintf(buffer, "%s", buildid->buf);
	376	kfree(buildid);
	377
	378	return ret;
	379	}
	380
	381	HYPERVISOR_ATTR_RO(buildid);
	382
cff7e81b JF	383	static struct attribute *xen_properties_attrs[] = {
	384	&capabilities_attr.attr,
	385	&changeset_attr.attr,
	386	&virtual_start_attr.attr,
	387	&pagesize_attr.attr,
a649b720	388	&features_attr.attr,
84b76257	389	&buildid_attr.attr,
cff7e81b JF	390	NULL
	391	};
	392
ead1d014	393	static const struct attribute_group xen_properties_group = {
cff7e81b JF	394	.name = "properties",
	395	.attrs = xen_properties_attrs,
	396	};
	397
5b00b504	398	static int __init xen_sysfs_properties_init(void)
cff7e81b JF	399	{
	400	return sysfs_create_group(hypervisor_kobj, &xen_properties_group);
	401	}
	402
5f141548 BO	403	#ifdef CONFIG_XEN_HAVE_VPMU
	404	struct pmu_mode {
	405	const char *name;
	406	uint32_t mode;
	407	};
	408
	409	static struct pmu_mode pmu_modes[] = {
	410	{"off", XENPMU_MODE_OFF},
	411	{"self", XENPMU_MODE_SELF},
	412	{"hv", XENPMU_MODE_HV},
	413	{"all", XENPMU_MODE_ALL}
	414	};
	415
	416	static ssize_t pmu_mode_store(struct hyp_sysfs_attr *attr,
	417	const char *buffer, size_t len)
	418	{
	419	int ret;
	420	struct xen_pmu_params xp;
	421	int i;
	422
	423	for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) {
	424	if (strncmp(buffer, pmu_modes[i].name, len - 1) == 0) {
	425	xp.val = pmu_modes[i].mode;
	426	break;
	427	}
	428	}
	429
	430	if (i == ARRAY_SIZE(pmu_modes))
	431	return -EINVAL;
	432
	433	xp.version.maj = XENPMU_VER_MAJ;
	434	xp.version.min = XENPMU_VER_MIN;
	435	ret = HYPERVISOR_xenpmu_op(XENPMU_mode_set, &xp);
	436	if (ret)
	437	return ret;
	438
	439	return len;
	440	}
	441
	442	static ssize_t pmu_mode_show(struct hyp_sysfs_attr attr, char buffer)
	443	{
	444	int ret;
	445	struct xen_pmu_params xp;
	446	int i;
	447	uint32_t mode;
	448
	449	xp.version.maj = XENPMU_VER_MAJ;
	450	xp.version.min = XENPMU_VER_MIN;
	451	ret = HYPERVISOR_xenpmu_op(XENPMU_mode_get, &xp);
	452	if (ret)
	453	return ret;
	454
	455	mode = (uint32_t)xp.val;
	456	for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) {
	457	if (mode == pmu_modes[i].mode)
	458	return sprintf(buffer, "%s\n", pmu_modes[i].name);
	459	}
	460
	461	return -EINVAL;
	462	}
	463	HYPERVISOR_ATTR_RW(pmu_mode);
	464
	465	static ssize_t pmu_features_store(struct hyp_sysfs_attr *attr,
	466	const char *buffer, size_t len)
467	{
468	int ret;
469	uint32_t features;
470	struct xen_pmu_params xp;
471
472	ret = kstrtou32(buffer, 0, &features);
473	if (ret)
474	return ret;
475
476	xp.val = features;
477	xp.version.maj = XENPMU_VER_MAJ;
478	xp.version.min = XENPMU_VER_MIN;
479	ret = HYPERVISOR_xenpmu_op(XENPMU_feature_set, &xp);
480	if (ret)
481	return ret;
482
483	return len;
484	}
485
486	static ssize_t pmu_features_show(struct hyp_sysfs_attr attr, char buffer)
487	{
488	int ret;
489	struct xen_pmu_params xp;
490
491	xp.version.maj = XENPMU_VER_MAJ;
492	xp.version.min = XENPMU_VER_MIN;
493	ret = HYPERVISOR_xenpmu_op(XENPMU_feature_get, &xp);
494	if (ret)
495	return ret;
496
497	return sprintf(buffer, "0x%x\n", (uint32_t)xp.val);
498	}
499	HYPERVISOR_ATTR_RW(pmu_features);
500
501	static struct attribute *xen_pmu_attrs[] = {
502	&pmu_mode_attr.attr,
503	&pmu_features_attr.attr,
504	NULL
505	};
506
507	static const struct attribute_group xen_pmu_group = {
508	.name = "pmu",
509	.attrs = xen_pmu_attrs,
510	};
511
5b00b504	512	static int __init xen_sysfs_pmu_init(void)
5f141548 BO	513	{
	514	return sysfs_create_group(hypervisor_kobj, &xen_pmu_group);
	515	}
5f141548 BO	516	#endif
5f141548 BO	517
cff7e81b JF	518	static int __init hyper_sysfs_init(void)
	519	{
	520	int ret;
	521
	522	if (!xen_domain())
	523	return -ENODEV;
	524
	525	ret = xen_sysfs_type_init();
	526	if (ret)
	527	goto out;
4a4c29c9 JG	528	ret = xen_sysfs_guest_type_init();
	529	if (ret)
	530	goto guest_type_out;
cff7e81b JF	531	ret = xen_sysfs_version_init();
	532	if (ret)
	533	goto version_out;
5b00b504	534	ret = xen_sysfs_compilation_init();
cff7e81b JF	535	if (ret)
	536	goto comp_out;
	537	ret = xen_sysfs_uuid_init();
	538	if (ret)
	539	goto uuid_out;
5b00b504	540	ret = xen_sysfs_properties_init();
cff7e81b JF	541	if (ret)
cff7e81b JF	542	goto prop_out;
5f141548 BO	543	#ifdef CONFIG_XEN_HAVE_VPMU
5f141548 BO	544	if (xen_initial_domain()) {
5b00b504	545	ret = xen_sysfs_pmu_init();
5f141548	546	if (ret) {
46894f17 PG	547	sysfs_remove_group(hypervisor_kobj,
46894f17 PG	548	&xen_properties_group);
5f141548 BO	549	goto prop_out;
	550	}
	551	}
	552	#endif
cff7e81b JF	553	goto out;
cff7e81b JF	554
cff7e81b	555	prop_out:
46894f17	556	sysfs_remove_file(hypervisor_kobj, &uuid_attr.attr);
cff7e81b	557	uuid_out:
46894f17	558	sysfs_remove_group(hypervisor_kobj, &xen_compilation_group);
cff7e81b	559	comp_out:
46894f17	560	sysfs_remove_group(hypervisor_kobj, &version_group);
cff7e81b	561	version_out:
4a4c29c9 JG	562	sysfs_remove_file(hypervisor_kobj, &guest_type_attr.attr);
4a4c29c9 JG	563	guest_type_out:
46894f17	564	sysfs_remove_file(hypervisor_kobj, &type_attr.attr);
cff7e81b JF	565	out:
	566	return ret;
	567	}
46894f17	568	device_initcall(hyper_sysfs_init);
cff7e81b JF	569
	570	static ssize_t hyp_sysfs_show(struct kobject *kobj,
	571	struct attribute *attr,
	572	char *buffer)
	573	{
	574	struct hyp_sysfs_attr *hyp_attr;
	575	hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr);
	576	if (hyp_attr->show)
	577	return hyp_attr->show(hyp_attr, buffer);
	578	return 0;
	579	}
	580
	581	static ssize_t hyp_sysfs_store(struct kobject *kobj,
	582	struct attribute *attr,
	583	const char *buffer,
	584	size_t len)
	585	{
	586	struct hyp_sysfs_attr *hyp_attr;
	587	hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr);
	588	if (hyp_attr->store)
	589	return hyp_attr->store(hyp_attr, buffer, len);
	590	return 0;
	591	}
	592
52cf25d0	593	static const struct sysfs_ops hyp_sysfs_ops = {
cff7e81b JF	594	.show = hyp_sysfs_show,
	595	.store = hyp_sysfs_store,
	596	};
	597
	598	static struct kobj_type hyp_sysfs_kobj_type = {
	599	.sysfs_ops = &hyp_sysfs_ops,
	600	};
	601
	602	static int __init hypervisor_subsys_init(void)
	603	{
	604	if (!xen_domain())
	605	return -ENODEV;
	606
	607	hypervisor_kobj->ktype = &hyp_sysfs_kobj_type;
	608	return 0;
	609	}
	610	device_initcall(hypervisor_subsys_init);