// 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_obj(struct xen_compile_info);	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_obj(struct xen_compile_info);	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_obj(struct xen_compile_info);	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_obj(struct xen_platform_parameters);	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;	}	if (ret > PAGE_SIZE)		return -ENOSPC; 	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) {		/* Build id is binary, not a string. */		memcpy(buffer, buildid->buf, ret);	}	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_VPMUstruct 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;}

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