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4ecc96cba8
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>
671 lines
14 KiB
C
671 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* copyright (c) 2006 IBM Corporation
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* Authored by: Mike D. Day <ncmike@us.ibm.com>
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*/
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#include <linux/slab.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/kobject.h>
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#include <linux/err.h>
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#include <asm/xen/hypervisor.h>
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#include <asm/xen/hypercall.h>
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#include <xen/xen.h>
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#include <xen/xenbus.h>
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#include <xen/interface/xen.h>
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#include <xen/interface/version.h>
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#ifdef CONFIG_XEN_HAVE_VPMU
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#include <xen/interface/xenpmu.h>
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#endif
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#define HYPERVISOR_ATTR_RO(_name) \
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static struct hyp_sysfs_attr _name##_attr = __ATTR_RO(_name)
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#define HYPERVISOR_ATTR_RW(_name) \
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static struct hyp_sysfs_attr _name##_attr = __ATTR_RW(_name)
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struct hyp_sysfs_attr {
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struct attribute attr;
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ssize_t (*show)(struct hyp_sysfs_attr *, char *);
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ssize_t (*store)(struct hyp_sysfs_attr *, const char *, size_t);
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union {
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void *hyp_attr_data;
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unsigned long hyp_attr_value;
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};
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};
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static ssize_t type_show(struct hyp_sysfs_attr *attr, char *buffer)
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{
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return sprintf(buffer, "xen\n");
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}
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HYPERVISOR_ATTR_RO(type);
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static int __init xen_sysfs_type_init(void)
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{
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return sysfs_create_file(hypervisor_kobj, &type_attr.attr);
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}
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static ssize_t guest_type_show(struct hyp_sysfs_attr *attr, char *buffer)
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{
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const char *type;
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switch (xen_domain_type) {
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case XEN_NATIVE:
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/* ARM only. */
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type = "Xen";
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break;
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case XEN_PV_DOMAIN:
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type = "PV";
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break;
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case XEN_HVM_DOMAIN:
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type = xen_pvh_domain() ? "PVH" : "HVM";
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break;
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default:
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return -EINVAL;
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}
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return sprintf(buffer, "%s\n", type);
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}
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HYPERVISOR_ATTR_RO(guest_type);
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static int __init xen_sysfs_guest_type_init(void)
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{
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return sysfs_create_file(hypervisor_kobj, &guest_type_attr.attr);
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}
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/* xen version attributes */
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static ssize_t major_show(struct hyp_sysfs_attr *attr, char *buffer)
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{
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int version = HYPERVISOR_xen_version(XENVER_version, NULL);
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if (version)
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return sprintf(buffer, "%d\n", version >> 16);
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return -ENODEV;
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}
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HYPERVISOR_ATTR_RO(major);
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static ssize_t minor_show(struct hyp_sysfs_attr *attr, char *buffer)
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{
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int version = HYPERVISOR_xen_version(XENVER_version, NULL);
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if (version)
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return sprintf(buffer, "%d\n", version & 0xff);
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return -ENODEV;
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}
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HYPERVISOR_ATTR_RO(minor);
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static ssize_t extra_show(struct hyp_sysfs_attr *attr, char *buffer)
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{
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int ret = -ENOMEM;
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char *extra;
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extra = kmalloc(XEN_EXTRAVERSION_LEN, GFP_KERNEL);
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if (extra) {
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ret = HYPERVISOR_xen_version(XENVER_extraversion, extra);
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if (!ret)
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ret = sprintf(buffer, "%s\n", extra);
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kfree(extra);
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}
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return ret;
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}
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HYPERVISOR_ATTR_RO(extra);
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static struct attribute *version_attrs[] = {
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&major_attr.attr,
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&minor_attr.attr,
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&extra_attr.attr,
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NULL
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};
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static const struct attribute_group version_group = {
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.name = "version",
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.attrs = version_attrs,
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};
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static int __init xen_sysfs_version_init(void)
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{
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return sysfs_create_group(hypervisor_kobj, &version_group);
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}
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/* UUID */
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static ssize_t uuid_show_fallback(struct hyp_sysfs_attr *attr, char *buffer)
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{
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char *vm, *val;
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int ret;
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extern int xenstored_ready;
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if (!xenstored_ready)
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return -EBUSY;
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vm = xenbus_read(XBT_NIL, "vm", "", NULL);
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if (IS_ERR(vm))
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return PTR_ERR(vm);
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val = xenbus_read(XBT_NIL, vm, "uuid", NULL);
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kfree(vm);
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if (IS_ERR(val))
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return PTR_ERR(val);
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ret = sprintf(buffer, "%s\n", val);
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kfree(val);
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return ret;
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}
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static ssize_t uuid_show(struct hyp_sysfs_attr *attr, char *buffer)
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{
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xen_domain_handle_t uuid;
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int ret;
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ret = HYPERVISOR_xen_version(XENVER_guest_handle, uuid);
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if (ret)
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return uuid_show_fallback(attr, buffer);
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ret = sprintf(buffer, "%pU\n", uuid);
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return ret;
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}
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HYPERVISOR_ATTR_RO(uuid);
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static int __init xen_sysfs_uuid_init(void)
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{
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return sysfs_create_file(hypervisor_kobj, &uuid_attr.attr);
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}
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/* xen compilation attributes */
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static ssize_t compiler_show(struct hyp_sysfs_attr *attr, char *buffer)
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{
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int ret = -ENOMEM;
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struct xen_compile_info *info;
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info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
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if (info) {
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ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
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if (!ret)
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ret = sprintf(buffer, "%s\n", info->compiler);
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kfree(info);
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}
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return ret;
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}
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HYPERVISOR_ATTR_RO(compiler);
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static ssize_t compiled_by_show(struct hyp_sysfs_attr *attr, char *buffer)
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{
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int ret = -ENOMEM;
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struct xen_compile_info *info;
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info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
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if (info) {
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ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
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if (!ret)
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ret = sprintf(buffer, "%s\n", info->compile_by);
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kfree(info);
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}
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return ret;
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}
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HYPERVISOR_ATTR_RO(compiled_by);
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static ssize_t compile_date_show(struct hyp_sysfs_attr *attr, char *buffer)
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{
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int ret = -ENOMEM;
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struct xen_compile_info *info;
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info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
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if (info) {
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ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
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if (!ret)
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ret = sprintf(buffer, "%s\n", info->compile_date);
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kfree(info);
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}
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return ret;
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}
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HYPERVISOR_ATTR_RO(compile_date);
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static struct attribute *xen_compile_attrs[] = {
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&compiler_attr.attr,
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&compiled_by_attr.attr,
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&compile_date_attr.attr,
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NULL
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};
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static const struct attribute_group xen_compilation_group = {
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.name = "compilation",
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.attrs = xen_compile_attrs,
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};
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static int __init xen_sysfs_compilation_init(void)
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{
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return sysfs_create_group(hypervisor_kobj, &xen_compilation_group);
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}
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/* xen properties info */
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static ssize_t capabilities_show(struct hyp_sysfs_attr *attr, char *buffer)
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{
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int ret = -ENOMEM;
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char *caps;
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caps = kmalloc(XEN_CAPABILITIES_INFO_LEN, GFP_KERNEL);
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if (caps) {
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ret = HYPERVISOR_xen_version(XENVER_capabilities, caps);
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if (!ret)
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ret = sprintf(buffer, "%s\n", caps);
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kfree(caps);
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}
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return ret;
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}
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HYPERVISOR_ATTR_RO(capabilities);
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static ssize_t changeset_show(struct hyp_sysfs_attr *attr, char *buffer)
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{
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int ret = -ENOMEM;
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char *cset;
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cset = kmalloc(XEN_CHANGESET_INFO_LEN, GFP_KERNEL);
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if (cset) {
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ret = HYPERVISOR_xen_version(XENVER_changeset, cset);
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if (!ret)
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ret = sprintf(buffer, "%s\n", cset);
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kfree(cset);
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}
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return ret;
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}
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HYPERVISOR_ATTR_RO(changeset);
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static ssize_t virtual_start_show(struct hyp_sysfs_attr *attr, char *buffer)
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{
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int ret = -ENOMEM;
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struct xen_platform_parameters *parms;
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parms = kmalloc(sizeof(struct xen_platform_parameters), GFP_KERNEL);
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if (parms) {
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ret = HYPERVISOR_xen_version(XENVER_platform_parameters,
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parms);
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if (!ret)
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ret = sprintf(buffer, "%"PRI_xen_ulong"\n",
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parms->virt_start);
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kfree(parms);
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}
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return ret;
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}
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HYPERVISOR_ATTR_RO(virtual_start);
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static ssize_t pagesize_show(struct hyp_sysfs_attr *attr, char *buffer)
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{
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int ret;
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ret = HYPERVISOR_xen_version(XENVER_pagesize, NULL);
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if (ret > 0)
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ret = sprintf(buffer, "%x\n", ret);
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return ret;
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}
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HYPERVISOR_ATTR_RO(pagesize);
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static ssize_t xen_feature_show(int index, char *buffer)
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{
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ssize_t ret;
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struct xen_feature_info info;
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info.submap_idx = index;
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ret = HYPERVISOR_xen_version(XENVER_get_features, &info);
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if (!ret)
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ret = sprintf(buffer, "%08x", info.submap);
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return ret;
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}
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static ssize_t features_show(struct hyp_sysfs_attr *attr, char *buffer)
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{
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ssize_t len;
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int i;
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len = 0;
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for (i = XENFEAT_NR_SUBMAPS-1; i >= 0; i--) {
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int ret = xen_feature_show(i, buffer + len);
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if (ret < 0) {
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if (len == 0)
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len = ret;
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break;
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}
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len += ret;
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}
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if (len > 0)
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buffer[len++] = '\n';
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return len;
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}
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HYPERVISOR_ATTR_RO(features);
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static ssize_t buildid_show(struct hyp_sysfs_attr *attr, char *buffer)
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{
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ssize_t ret;
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struct xen_build_id *buildid;
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ret = HYPERVISOR_xen_version(XENVER_build_id, NULL);
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if (ret < 0) {
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if (ret == -EPERM)
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ret = sprintf(buffer, "<denied>");
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return ret;
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}
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buildid = kmalloc(sizeof(*buildid) + ret, GFP_KERNEL);
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if (!buildid)
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return -ENOMEM;
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buildid->len = ret;
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ret = HYPERVISOR_xen_version(XENVER_build_id, buildid);
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if (ret > 0)
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ret = sprintf(buffer, "%s", buildid->buf);
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kfree(buildid);
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return ret;
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}
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HYPERVISOR_ATTR_RO(buildid);
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static struct attribute *xen_properties_attrs[] = {
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&capabilities_attr.attr,
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&changeset_attr.attr,
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&virtual_start_attr.attr,
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&pagesize_attr.attr,
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&features_attr.attr,
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&buildid_attr.attr,
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NULL
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};
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static const struct attribute_group xen_properties_group = {
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.name = "properties",
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.attrs = xen_properties_attrs,
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};
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static int __init xen_sysfs_properties_init(void)
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{
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return sysfs_create_group(hypervisor_kobj, &xen_properties_group);
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}
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#define FLAG_UNAME "unknown"
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#define FLAG_UNAME_FMT FLAG_UNAME "%02u"
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#define FLAG_UNAME_MAX sizeof(FLAG_UNAME "XX")
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#define FLAG_COUNT (sizeof(xen_start_flags) * BITS_PER_BYTE)
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static_assert(sizeof(xen_start_flags) <=
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sizeof_field(struct hyp_sysfs_attr, hyp_attr_value));
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static ssize_t flag_show(struct hyp_sysfs_attr *attr, char *buffer)
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{
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char *p = buffer;
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*p++ = '0' + ((xen_start_flags & attr->hyp_attr_value) != 0);
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*p++ = '\n';
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return p - buffer;
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}
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#define FLAG_NODE(flag, node) \
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[ilog2(flag)] = { \
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.attr = { .name = #node, .mode = 0444 },\
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.show = flag_show, \
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.hyp_attr_value = flag \
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}
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/*
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* Add new, known flags here. No other changes are required, but
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* note that each known flag wastes one entry in flag_unames[].
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* The code/complexity machinations to avoid this isn't worth it
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* for a few entries, but keep it in mind.
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*/
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static struct hyp_sysfs_attr flag_attrs[FLAG_COUNT] = {
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FLAG_NODE(SIF_PRIVILEGED, privileged),
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FLAG_NODE(SIF_INITDOMAIN, initdomain)
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};
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static struct attribute_group xen_flags_group = {
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.name = "start_flags",
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.attrs = (struct attribute *[FLAG_COUNT + 1]){}
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};
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static char flag_unames[FLAG_COUNT][FLAG_UNAME_MAX];
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static int __init xen_sysfs_flags_init(void)
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{
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for (unsigned fnum = 0; fnum != FLAG_COUNT; fnum++) {
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if (likely(flag_attrs[fnum].attr.name == NULL)) {
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sprintf(flag_unames[fnum], FLAG_UNAME_FMT, fnum);
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flag_attrs[fnum].attr.name = flag_unames[fnum];
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flag_attrs[fnum].attr.mode = 0444;
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flag_attrs[fnum].show = flag_show;
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flag_attrs[fnum].hyp_attr_value = 1 << fnum;
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}
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xen_flags_group.attrs[fnum] = &flag_attrs[fnum].attr;
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}
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return sysfs_create_group(hypervisor_kobj, &xen_flags_group);
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}
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#ifdef CONFIG_XEN_HAVE_VPMU
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struct pmu_mode {
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const char *name;
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uint32_t mode;
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};
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static struct pmu_mode pmu_modes[] = {
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{"off", XENPMU_MODE_OFF},
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{"self", XENPMU_MODE_SELF},
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{"hv", XENPMU_MODE_HV},
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{"all", XENPMU_MODE_ALL}
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};
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static ssize_t pmu_mode_store(struct hyp_sysfs_attr *attr,
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const char *buffer, size_t len)
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{
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int ret;
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struct xen_pmu_params xp;
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int i;
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for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) {
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if (strncmp(buffer, pmu_modes[i].name, len - 1) == 0) {
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xp.val = pmu_modes[i].mode;
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break;
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}
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}
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if (i == ARRAY_SIZE(pmu_modes))
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return -EINVAL;
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xp.version.maj = XENPMU_VER_MAJ;
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xp.version.min = XENPMU_VER_MIN;
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ret = HYPERVISOR_xenpmu_op(XENPMU_mode_set, &xp);
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if (ret)
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return ret;
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return len;
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}
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static ssize_t pmu_mode_show(struct hyp_sysfs_attr *attr, char *buffer)
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{
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int ret;
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struct xen_pmu_params xp;
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int i;
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uint32_t mode;
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xp.version.maj = XENPMU_VER_MAJ;
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xp.version.min = XENPMU_VER_MIN;
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ret = HYPERVISOR_xenpmu_op(XENPMU_mode_get, &xp);
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if (ret)
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return ret;
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mode = (uint32_t)xp.val;
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for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) {
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if (mode == pmu_modes[i].mode)
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return sprintf(buffer, "%s\n", pmu_modes[i].name);
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}
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return -EINVAL;
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}
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HYPERVISOR_ATTR_RW(pmu_mode);
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static ssize_t pmu_features_store(struct hyp_sysfs_attr *attr,
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const char *buffer, size_t len)
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{
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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);
|