![Daniel De Graaf](/assets/img/avatar_default.png)
This hypercall has been present since Xen 3.1, and is the preferred method for a domain to obtain its UUID. Fall back to the xenstore method if using an older version of Xen (which returns -ENOSYS). Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
459 lines
9.4 KiB
C
459 lines
9.4 KiB
C
/*
|
|
* copyright (c) 2006 IBM Corporation
|
|
* Authored by: Mike D. Day <ncmike@us.ibm.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/slab.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/kobject.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>
|
|
|
|
#define HYPERVISOR_ATTR_RO(_name) \
|
|
static struct hyp_sysfs_attr _name##_attr = __ATTR_RO(_name)
|
|
|
|
#define HYPERVISOR_ATTR_RW(_name) \
|
|
static struct hyp_sysfs_attr _name##_attr = \
|
|
__ATTR(_name, 0644, _name##_show, _name##_store)
|
|
|
|
struct hyp_sysfs_attr {
|
|
struct attribute attr;
|
|
ssize_t (*show)(struct hyp_sysfs_attr *, char *);
|
|
ssize_t (*store)(struct hyp_sysfs_attr *, const char *, size_t);
|
|
void *hyp_attr_data;
|
|
};
|
|
|
|
static ssize_t type_show(struct hyp_sysfs_attr *attr, char *buffer)
|
|
{
|
|
return sprintf(buffer, "xen\n");
|
|
}
|
|
|
|
HYPERVISOR_ATTR_RO(type);
|
|
|
|
static int __init xen_sysfs_type_init(void)
|
|
{
|
|
return sysfs_create_file(hypervisor_kobj, &type_attr.attr);
|
|
}
|
|
|
|
static void xen_sysfs_type_destroy(void)
|
|
{
|
|
sysfs_remove_file(hypervisor_kobj, &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);
|
|
}
|
|
|
|
static void xen_sysfs_version_destroy(void)
|
|
{
|
|
sysfs_remove_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);
|
|
}
|
|
|
|
static void xen_sysfs_uuid_destroy(void)
|
|
{
|
|
sysfs_remove_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_compilation_init(void)
|
|
{
|
|
return sysfs_create_group(hypervisor_kobj, &xen_compilation_group);
|
|
}
|
|
|
|
static void xen_compilation_destroy(void)
|
|
{
|
|
sysfs_remove_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, "%lx\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 struct attribute *xen_properties_attrs[] = {
|
|
&capabilities_attr.attr,
|
|
&changeset_attr.attr,
|
|
&virtual_start_attr.attr,
|
|
&pagesize_attr.attr,
|
|
&features_attr.attr,
|
|
NULL
|
|
};
|
|
|
|
static const struct attribute_group xen_properties_group = {
|
|
.name = "properties",
|
|
.attrs = xen_properties_attrs,
|
|
};
|
|
|
|
static int __init xen_properties_init(void)
|
|
{
|
|
return sysfs_create_group(hypervisor_kobj, &xen_properties_group);
|
|
}
|
|
|
|
static void xen_properties_destroy(void)
|
|
{
|
|
sysfs_remove_group(hypervisor_kobj, &xen_properties_group);
|
|
}
|
|
|
|
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_version_init();
|
|
if (ret)
|
|
goto version_out;
|
|
ret = xen_compilation_init();
|
|
if (ret)
|
|
goto comp_out;
|
|
ret = xen_sysfs_uuid_init();
|
|
if (ret)
|
|
goto uuid_out;
|
|
ret = xen_properties_init();
|
|
if (ret)
|
|
goto prop_out;
|
|
|
|
goto out;
|
|
|
|
prop_out:
|
|
xen_sysfs_uuid_destroy();
|
|
uuid_out:
|
|
xen_compilation_destroy();
|
|
comp_out:
|
|
xen_sysfs_version_destroy();
|
|
version_out:
|
|
xen_sysfs_type_destroy();
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static void __exit hyper_sysfs_exit(void)
|
|
{
|
|
xen_properties_destroy();
|
|
xen_compilation_destroy();
|
|
xen_sysfs_uuid_destroy();
|
|
xen_sysfs_version_destroy();
|
|
xen_sysfs_type_destroy();
|
|
|
|
}
|
|
module_init(hyper_sysfs_init);
|
|
module_exit(hyper_sysfs_exit);
|
|
|
|
static ssize_t hyp_sysfs_show(struct kobject *kobj,
|
|
struct attribute *attr,
|
|
char *buffer)
|
|
{
|
|
struct hyp_sysfs_attr *hyp_attr;
|
|
hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr);
|
|
if (hyp_attr->show)
|
|
return hyp_attr->show(hyp_attr, buffer);
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t hyp_sysfs_store(struct kobject *kobj,
|
|
struct attribute *attr,
|
|
const char *buffer,
|
|
size_t len)
|
|
{
|
|
struct hyp_sysfs_attr *hyp_attr;
|
|
hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr);
|
|
if (hyp_attr->store)
|
|
return hyp_attr->store(hyp_attr, buffer, len);
|
|
return 0;
|
|
}
|
|
|
|
static const struct sysfs_ops hyp_sysfs_ops = {
|
|
.show = hyp_sysfs_show,
|
|
.store = hyp_sysfs_store,
|
|
};
|
|
|
|
static struct kobj_type hyp_sysfs_kobj_type = {
|
|
.sysfs_ops = &hyp_sysfs_ops,
|
|
};
|
|
|
|
static int __init hypervisor_subsys_init(void)
|
|
{
|
|
if (!xen_domain())
|
|
return -ENODEV;
|
|
|
|
hypervisor_kobj->ktype = &hyp_sysfs_kobj_type;
|
|
return 0;
|
|
}
|
|
device_initcall(hypervisor_subsys_init);
|