linux/drivers/xen/sys-hypervisor.c
Thomas Weißschuh 4ecc96cba8 xen: sysfs: make kobj_type structure constant
Since commit ee6d3dd4ed ("driver core: make kobj_type constant.")
the driver core allows the usage of const struct kobj_type.

Take advantage of this to constify the structure definition to prevent
modification at runtime.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Reviewed-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/20230216-kobj_type-xen-v1-1-742423de7d71@weissschuh.net
Signed-off-by: Juergen Gross <jgross@suse.com>
2023-02-18 16:50:21 +01:00

671 lines
14 KiB
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);