[linux-block.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_RW(_name)

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);
	union {
		void *hyp_attr_data;
		unsigned long hyp_attr_value;
	};
};

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);
}

#define FLAG_UNAME "unknown"
#define FLAG_UNAME_FMT FLAG_UNAME "%02u"
#define FLAG_UNAME_MAX sizeof(FLAG_UNAME "XX")
#define FLAG_COUNT (sizeof(xen_start_flags) * BITS_PER_BYTE)
static_assert(sizeof(xen_start_flags) <=
	      sizeof_field(struct hyp_sysfs_attr, hyp_attr_value));

static ssize_t flag_show(struct hyp_sysfs_attr *attr, char *buffer)
{
	char *p = buffer;

	*p++ = '0' + ((xen_start_flags & attr->hyp_attr_value) != 0);
	*p++ = '\n';
	return p - buffer;
}

#define FLAG_NODE(flag, node)				\
	[ilog2(flag)] = {				\
		.attr = { .name = #node, .mode = 0444 },\
		.show = flag_show,			\
		.hyp_attr_value = flag			\
	}

/*
 * Add new, known flags here.  No other changes are required, but
 * note that each known flag wastes one entry in flag_unames[].
 * The code/complexity machinations to avoid this isn't worth it
 * for a few entries, but keep it in mind.
 */
static struct hyp_sysfs_attr flag_attrs[FLAG_COUNT] = {
	FLAG_NODE(SIF_PRIVILEGED, privileged),
	FLAG_NODE(SIF_INITDOMAIN, initdomain)
};
static struct attribute_group xen_flags_group = {
	.name = "start_flags",
	.attrs = (struct attribute *[FLAG_COUNT + 1]){}
};
static char flag_unames[FLAG_COUNT][FLAG_UNAME_MAX];

static int __init xen_sysfs_flags_init(void)
{
	for (unsigned fnum = 0; fnum != FLAG_COUNT; fnum++) {
		if (likely(flag_attrs[fnum].attr.name == NULL)) {
			sprintf(flag_unames[fnum], FLAG_UNAME_FMT, fnum);
			flag_attrs[fnum].attr.name = flag_unames[fnum];
			flag_attrs[fnum].attr.mode = 0444;
			flag_attrs[fnum].show = flag_show;
			flag_attrs[fnum].hyp_attr_value = 1 << fnum;
		}
		xen_flags_group.attrs[fnum] = &flag_attrs[fnum].attr;
	}
	return sysfs_create_group(hypervisor_kobj, &xen_flags_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;
	ret = xen_sysfs_flags_init();
	if (ret)
		goto flags_out;
#ifdef CONFIG_XEN_HAVE_VPMU
	if (xen_initial_domain()) {
		ret = xen_sysfs_pmu_init();
		if (ret) {
			sysfs_remove_group(hypervisor_kobj, &xen_flags_group);
			goto flags_out;
		}
	}
#endif
	goto out;

flags_out:
	sysfs_remove_group(hypervisor_kobj, &xen_properties_group);
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 const 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
cff7e81b JF	24	#define HYPERVISOR_ATTR_RO(_name) \
982e4430	25	static struct hyp_sysfs_attr _name##_attr = __ATTR_RO(_name)
cff7e81b JF	26
cff7e81b JF	27	#define HYPERVISOR_ATTR_RW(_name) \
982e4430	28	static struct hyp_sysfs_attr _name##_attr = __ATTR_RW(_name)
cff7e81b JF	29
	30	struct 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);
415dab3c PB	34	union {
	35	void *hyp_attr_data;
	36	unsigned long hyp_attr_value;
	37	};
cff7e81b JF	38	};
	39
	40	static ssize_t type_show(struct hyp_sysfs_attr attr, char buffer)
	41	{
	42	return sprintf(buffer, "xen\n");
	43	}
	44
	45	HYPERVISOR_ATTR_RO(type);
	46
	47	static int __init xen_sysfs_type_init(void)
	48	{
	49	return sysfs_create_file(hypervisor_kobj, &type_attr.attr);
	50	}
	51
4a4c29c9 JG	52	static 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
	74	HYPERVISOR_ATTR_RO(guest_type);
	75
	76	static int __init xen_sysfs_guest_type_init(void)
	77	{
	78	return sysfs_create_file(hypervisor_kobj, &guest_type_attr.attr);
	79	}
	80
cff7e81b JF	81	/* xen version attributes */
	82	static 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
	90	HYPERVISOR_ATTR_RO(major);
	91
	92	static 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
	100	HYPERVISOR_ATTR_RO(minor);
	101
	102	static 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
	118	HYPERVISOR_ATTR_RO(extra);
	119
	120	static struct attribute *version_attrs[] = {
	121	&major_attr.attr,
	122	&minor_attr.attr,
	123	&extra_attr.attr,
	124	NULL
	125	};
	126
ead1d014	127	static const struct attribute_group version_group = {
cff7e81b JF	128	.name = "version",
	129	.attrs = version_attrs,
	130	};
	131
	132	static int __init xen_sysfs_version_init(void)
	133	{
	134	return sysfs_create_group(hypervisor_kobj, &version_group);
	135	}
	136
cff7e81b JF	137	/* UUID */
cff7e81b JF	138
5c13f806	139	static ssize_t uuid_show_fallback(struct hyp_sysfs_attr attr, char buffer)
cff7e81b JF	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
5c13f806 DDG	160	static 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
cff7e81b JF	171	HYPERVISOR_ATTR_RO(uuid);
	172
	173	static int __init xen_sysfs_uuid_init(void)
	174	{
	175	return sysfs_create_file(hypervisor_kobj, &uuid_attr.attr);
	176	}
	177
cff7e81b JF	178	/* xen compilation attributes */
	179
	180	static 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(sizeof(struct xen_compile_info), GFP_KERNEL);
	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
	196	HYPERVISOR_ATTR_RO(compiler);
	197
	198	static 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(sizeof(struct xen_compile_info), GFP_KERNEL);
	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
	214	HYPERVISOR_ATTR_RO(compiled_by);
	215
	216	static 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(sizeof(struct xen_compile_info), GFP_KERNEL);
	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
	232	HYPERVISOR_ATTR_RO(compile_date);
	233
	234	static struct attribute *xen_compile_attrs[] = {
	235	&compiler_attr.attr,
	236	&compiled_by_attr.attr,
	237	&compile_date_attr.attr,
	238	NULL
	239	};
	240
ead1d014	241	static const struct attribute_group xen_compilation_group = {
cff7e81b JF	242	.name = "compilation",
	243	.attrs = xen_compile_attrs,
	244	};
	245
5b00b504	246	static int __init xen_sysfs_compilation_init(void)
cff7e81b JF	247	{
	248	return sysfs_create_group(hypervisor_kobj, &xen_compilation_group);
	249	}
	250
cff7e81b JF	251	/* xen properties info */
	252
	253	static 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
	269	HYPERVISOR_ATTR_RO(capabilities);
	270
	271	static 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
	287	HYPERVISOR_ATTR_RO(changeset);
	288
	289	static 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(sizeof(struct xen_platform_parameters), GFP_KERNEL);
	295	if (parms) {
	296	ret = HYPERVISOR_xen_version(XENVER_platform_parameters,
	297	parms);
	298	if (!ret)
37ea0fcb IC	299	ret = sprintf(buffer, "%"PRI_xen_ulong"\n",
37ea0fcb IC	300	parms->virt_start);
cff7e81b JF	301	kfree(parms);
	302	}
	303
	304	return ret;
	305	}
	306
	307	HYPERVISOR_ATTR_RO(virtual_start);
	308
	309	static 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
	320	HYPERVISOR_ATTR_RO(pagesize);
	321
cff7e81b JF	322	static ssize_t xen_feature_show(int index, char *buffer)
cff7e81b JF	323	{
a649b720 JF	324	ssize_t ret;
a649b720 JF	325	struct xen_feature_info info;
cff7e81b	326
a649b720 JF	327	info.submap_idx = index;
	328	ret = HYPERVISOR_xen_version(XENVER_get_features, &info);
	329	if (!ret)
	330	ret = sprintf(buffer, "%08x", info.submap);
cff7e81b JF	331
	332	return ret;
	333	}
	334
a649b720	335	static ssize_t features_show(struct hyp_sysfs_attr attr, char buffer)
cff7e81b	336	{
a649b720 JF	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;
cff7e81b JF	354	}
cff7e81b JF	355
a649b720	356	HYPERVISOR_ATTR_RO(features);
cff7e81b	357
84b76257 JG	358	static 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
	370	buildid = kmalloc(sizeof(*buildid) + ret, GFP_KERNEL);
	371	if (!buildid)
	372	return -ENOMEM;
	373
	374	buildid->len = ret;
	375	ret = HYPERVISOR_xen_version(XENVER_build_id, buildid);
	376	if (ret > 0)
	377	ret = sprintf(buffer, "%s", buildid->buf);
	378	kfree(buildid);
	379
	380	return ret;
	381	}
	382
	383	HYPERVISOR_ATTR_RO(buildid);
	384
cff7e81b JF	385	static struct attribute *xen_properties_attrs[] = {
	386	&capabilities_attr.attr,
	387	&changeset_attr.attr,
	388	&virtual_start_attr.attr,
	389	&pagesize_attr.attr,
a649b720	390	&features_attr.attr,
84b76257	391	&buildid_attr.attr,
cff7e81b JF	392	NULL
	393	};
	394
ead1d014	395	static const struct attribute_group xen_properties_group = {
cff7e81b JF	396	.name = "properties",
	397	.attrs = xen_properties_attrs,
	398	};
	399
5b00b504	400	static int __init xen_sysfs_properties_init(void)
cff7e81b JF	401	{
	402	return sysfs_create_group(hypervisor_kobj, &xen_properties_group);
	403	}
	404
415dab3c PB	405	#define FLAG_UNAME "unknown"
	406	#define FLAG_UNAME_FMT FLAG_UNAME "%02u"
	407	#define FLAG_UNAME_MAX sizeof(FLAG_UNAME "XX")
	408	#define FLAG_COUNT (sizeof(xen_start_flags) * BITS_PER_BYTE)
	409	static_assert(sizeof(xen_start_flags) <=
	410	sizeof_field(struct hyp_sysfs_attr, hyp_attr_value));
	411
	412	static ssize_t flag_show(struct hyp_sysfs_attr attr, char buffer)
	413	{
	414	char *p = buffer;
	415
	416	*p++ = '0' + ((xen_start_flags & attr->hyp_attr_value) != 0);
	417	*p++ = '\n';
	418	return p - buffer;
	419	}
	420
	421	#define FLAG_NODE(flag, node) \
	422	[ilog2(flag)] = { \
	423	.attr = { .name = #node, .mode = 0444 },\
	424	.show = flag_show, \
	425	.hyp_attr_value = flag \
	426	}
	427
	428	/*
	429	* Add new, known flags here. No other changes are required, but
	430	* note that each known flag wastes one entry in flag_unames[].
	431	* The code/complexity machinations to avoid this isn't worth it
	432	* for a few entries, but keep it in mind.
	433	*/
	434	static struct hyp_sysfs_attr flag_attrs[FLAG_COUNT] = {
	435	FLAG_NODE(SIF_PRIVILEGED, privileged),
	436	FLAG_NODE(SIF_INITDOMAIN, initdomain)
	437	};
	438	static struct attribute_group xen_flags_group = {
	439	.name = "start_flags",
	440	.attrs = (struct attribute *[FLAG_COUNT + 1]){}
	441	};
	442	static char flag_unames[FLAG_COUNT][FLAG_UNAME_MAX];
	443
	444	static int __init xen_sysfs_flags_init(void)
	445	{
	446	for (unsigned fnum = 0; fnum != FLAG_COUNT; fnum++) {
	447	if (likely(flag_attrs[fnum].attr.name == NULL)) {
	448	sprintf(flag_unames[fnum], FLAG_UNAME_FMT, fnum);
	449	flag_attrs[fnum].attr.name = flag_unames[fnum];
	450	flag_attrs[fnum].attr.mode = 0444;
	451	flag_attrs[fnum].show = flag_show;
	452	flag_attrs[fnum].hyp_attr_value = 1 << fnum;
	453	}
	454	xen_flags_group.attrs[fnum] = &flag_attrs[fnum].attr;
	455	}
	456	return sysfs_create_group(hypervisor_kobj, &xen_flags_group);
	457	}
	458
5f141548 BO	459	#ifdef CONFIG_XEN_HAVE_VPMU
	460	struct pmu_mode {
	461	const char *name;
	462	uint32_t mode;
	463	};
	464
	465	static struct pmu_mode pmu_modes[] = {
	466	{"off", XENPMU_MODE_OFF},
	467	{"self", XENPMU_MODE_SELF},
	468	{"hv", XENPMU_MODE_HV},
	469	{"all", XENPMU_MODE_ALL}
	470	};
	471
	472	static ssize_t pmu_mode_store(struct hyp_sysfs_attr *attr,
	473	const char *buffer, size_t len)
	474	{
	475	int ret;
	476	struct xen_pmu_params xp;
	477	int i;
	478
	479	for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) {
	480	if (strncmp(buffer, pmu_modes[i].name, len - 1) == 0) {
	481	xp.val = pmu_modes[i].mode;
	482	break;
	483	}
	484	}
	485
	486	if (i == ARRAY_SIZE(pmu_modes))
	487	return -EINVAL;
	488
	489	xp.version.maj = XENPMU_VER_MAJ;
	490	xp.version.min = XENPMU_VER_MIN;
	491	ret = HYPERVISOR_xenpmu_op(XENPMU_mode_set, &xp);
	492	if (ret)
	493	return ret;
	494
	495	return len;
	496	}
	497
	498	static ssize_t pmu_mode_show(struct hyp_sysfs_attr attr, char buffer)
	499	{
	500	int ret;
	501	struct xen_pmu_params xp;
	502	int i;
	503	uint32_t mode;
	504
	505	xp.version.maj = XENPMU_VER_MAJ;
	506	xp.version.min = XENPMU_VER_MIN;
	507	ret = HYPERVISOR_xenpmu_op(XENPMU_mode_get, &xp);
	508	if (ret)
	509	return ret;
	510
	511	mode = (uint32_t)xp.val;
	512	for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) {
	513	if (mode == pmu_modes[i].mode)
	514	return sprintf(buffer, "%s\n", pmu_modes[i].name);
	515	}
	516
	517	return -EINVAL;
	518	}
	519	HYPERVISOR_ATTR_RW(pmu_mode);
	520
	521	static ssize_t pmu_features_store(struct hyp_sysfs_attr *attr,
	522	const char *buffer, size_t len)
523	{
524	int ret;
525	uint32_t features;
526	struct xen_pmu_params xp;
527
528	ret = kstrtou32(buffer, 0, &features);
529	if (ret)
530	return ret;
531
532	xp.val = features;
533	xp.version.maj = XENPMU_VER_MAJ;
534	xp.version.min = XENPMU_VER_MIN;
535	ret = HYPERVISOR_xenpmu_op(XENPMU_feature_set, &xp);
536	if (ret)
537	return ret;
538
539	return len;
540	}
541
542	static ssize_t pmu_features_show(struct hyp_sysfs_attr attr, char buffer)
543	{
544	int ret;
545	struct xen_pmu_params xp;
546
547	xp.version.maj = XENPMU_VER_MAJ;
548	xp.version.min = XENPMU_VER_MIN;
549	ret = HYPERVISOR_xenpmu_op(XENPMU_feature_get, &xp);
550	if (ret)
551	return ret;
552
553	return sprintf(buffer, "0x%x\n", (uint32_t)xp.val);
554	}
555	HYPERVISOR_ATTR_RW(pmu_features);
556
557	static struct attribute *xen_pmu_attrs[] = {
558	&pmu_mode_attr.attr,
559	&pmu_features_attr.attr,
560	NULL
561	};
562
563	static const struct attribute_group xen_pmu_group = {
564	.name = "pmu",
565	.attrs = xen_pmu_attrs,
566	};
567
5b00b504	568	static int __init xen_sysfs_pmu_init(void)
5f141548 BO	569	{
	570	return sysfs_create_group(hypervisor_kobj, &xen_pmu_group);
	571	}
5f141548 BO	572	#endif
5f141548 BO	573
cff7e81b JF	574	static int __init hyper_sysfs_init(void)
	575	{
	576	int ret;
	577
	578	if (!xen_domain())
	579	return -ENODEV;
	580
	581	ret = xen_sysfs_type_init();
	582	if (ret)
	583	goto out;
4a4c29c9 JG	584	ret = xen_sysfs_guest_type_init();
	585	if (ret)
	586	goto guest_type_out;
cff7e81b JF	587	ret = xen_sysfs_version_init();
	588	if (ret)
	589	goto version_out;
5b00b504	590	ret = xen_sysfs_compilation_init();
cff7e81b JF	591	if (ret)
	592	goto comp_out;
	593	ret = xen_sysfs_uuid_init();
	594	if (ret)
	595	goto uuid_out;
5b00b504	596	ret = xen_sysfs_properties_init();
cff7e81b JF	597	if (ret)
cff7e81b JF	598	goto prop_out;
415dab3c PB	599	ret = xen_sysfs_flags_init();
	600	if (ret)
	601	goto flags_out;
5f141548 BO	602	#ifdef CONFIG_XEN_HAVE_VPMU
5f141548 BO	603	if (xen_initial_domain()) {
5b00b504	604	ret = xen_sysfs_pmu_init();
5f141548	605	if (ret) {
415dab3c PB	606	sysfs_remove_group(hypervisor_kobj, &xen_flags_group);
415dab3c PB	607	goto flags_out;
5f141548 BO	608	}
	609	}
	610	#endif
cff7e81b JF	611	goto out;
cff7e81b JF	612
415dab3c PB	613	flags_out:
415dab3c PB	614	sysfs_remove_group(hypervisor_kobj, &xen_properties_group);
cff7e81b	615	prop_out:
46894f17	616	sysfs_remove_file(hypervisor_kobj, &uuid_attr.attr);
cff7e81b	617	uuid_out:
46894f17	618	sysfs_remove_group(hypervisor_kobj, &xen_compilation_group);
cff7e81b	619	comp_out:
46894f17	620	sysfs_remove_group(hypervisor_kobj, &version_group);
cff7e81b	621	version_out:
4a4c29c9 JG	622	sysfs_remove_file(hypervisor_kobj, &guest_type_attr.attr);
4a4c29c9 JG	623	guest_type_out:
46894f17	624	sysfs_remove_file(hypervisor_kobj, &type_attr.attr);
cff7e81b JF	625	out:
	626	return ret;
	627	}
46894f17	628	device_initcall(hyper_sysfs_init);
cff7e81b JF	629
	630	static ssize_t hyp_sysfs_show(struct kobject *kobj,
	631	struct attribute *attr,
	632	char *buffer)
	633	{
	634	struct hyp_sysfs_attr *hyp_attr;
	635	hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr);
	636	if (hyp_attr->show)
	637	return hyp_attr->show(hyp_attr, buffer);
	638	return 0;
	639	}
	640
	641	static ssize_t hyp_sysfs_store(struct kobject *kobj,
	642	struct attribute *attr,
	643	const char *buffer,
	644	size_t len)
	645	{
	646	struct hyp_sysfs_attr *hyp_attr;
	647	hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr);
	648	if (hyp_attr->store)
	649	return hyp_attr->store(hyp_attr, buffer, len);
	650	return 0;
	651	}
	652
52cf25d0	653	static const struct sysfs_ops hyp_sysfs_ops = {
cff7e81b JF	654	.show = hyp_sysfs_show,
	655	.store = hyp_sysfs_store,
	656	};
	657
4ecc96cb	658	static const struct kobj_type hyp_sysfs_kobj_type = {
cff7e81b JF	659	.sysfs_ops = &hyp_sysfs_ops,
	660	};
	661
	662	static int __init hypervisor_subsys_init(void)
	663	{
	664	if (!xen_domain())
	665	return -ENODEV;
	666
	667	hypervisor_kobj->ktype = &hyp_sysfs_kobj_type;
	668	return 0;
	669	}
	670	device_initcall(hypervisor_subsys_init);