xen: add /sys/hypervisor support
Adds support for Xen info under /sys/hypervisor. Taken from Novell 2.6.27 backport tree. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
This commit is contained in:
Jeremy Fitzhardinge
parent
6d02c42698
commit
cff7e81b3d
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@ -41,3 +41,13 @@ config XEN_COMPAT_XENFS
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a xen platform.
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If in doubt, say yes.
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config XEN_SYS_HYPERVISOR
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bool "Create xen entries under /sys/hypervisor"
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depends on XEN && SYSFS
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select SYS_HYPERVISOR
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default y
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help
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Create entries under /sys/hypervisor describing the Xen
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hypervisor environment. When running native or in another
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virtual environment, /sys/hypervisor will still be present,
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but will have no xen contents.
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@ -4,4 +4,5 @@ obj-y += xenbus/
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obj-$(CONFIG_HOTPLUG_CPU) += cpu_hotplug.o
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obj-$(CONFIG_XEN_XENCOMM) += xencomm.o
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obj-$(CONFIG_XEN_BALLOON) += balloon.o
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obj-$(CONFIG_XENFS) += xenfs/
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obj-$(CONFIG_XENFS) += xenfs/
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obj-$(CONFIG_XEN_SYS_HYPERVISOR) += sys-hypervisor.o
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@ -0,0 +1,475 @@
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/kobject.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/xenbus.h>
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#include <xen/interface/xen.h>
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#include <xen/interface/version.h>
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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 = \
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__ATTR(_name, 0644, _name##_show, _name##_store)
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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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void *hyp_attr_data;
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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 void xen_sysfs_type_destroy(void)
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{
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sysfs_remove_file(hypervisor_kobj, &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 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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static void xen_sysfs_version_destroy(void)
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{
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sysfs_remove_group(hypervisor_kobj, &version_group);
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}
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/* UUID */
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static ssize_t uuid_show(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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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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static void xen_sysfs_uuid_destroy(void)
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{
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sysfs_remove_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 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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int __init static xen_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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static void xen_compilation_destroy(void)
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{
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sysfs_remove_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, "%lx\n", 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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/* eventually there will be several more features to export */
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static ssize_t xen_feature_show(int index, char *buffer)
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{
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int ret = -ENOMEM;
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struct xen_feature_info *info;
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info = kmalloc(sizeof(struct xen_feature_info), GFP_KERNEL);
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if (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, "%d\n", info->submap);
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kfree(info);
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}
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return ret;
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}
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static ssize_t writable_pt_show(struct hyp_sysfs_attr *attr, char *buffer)
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{
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return xen_feature_show(XENFEAT_writable_page_tables, buffer);
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}
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HYPERVISOR_ATTR_RO(writable_pt);
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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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&writable_pt_attr.attr,
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NULL
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};
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static 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_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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static void xen_properties_destroy(void)
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{
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sysfs_remove_group(hypervisor_kobj, &xen_properties_group);
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}
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#ifdef CONFIG_KEXEC
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extern size_t vmcoreinfo_size_xen;
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extern unsigned long paddr_vmcoreinfo_xen;
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static ssize_t vmcoreinfo_show(struct hyp_sysfs_attr *attr, char *page)
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{
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return sprintf(page, "%lx %zx\n",
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paddr_vmcoreinfo_xen, vmcoreinfo_size_xen);
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}
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HYPERVISOR_ATTR_RO(vmcoreinfo);
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static int __init xen_sysfs_vmcoreinfo_init(void)
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{
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return sysfs_create_file(hypervisor_kobj,
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&vmcoreinfo_attr.attr);
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}
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static void xen_sysfs_vmcoreinfo_destroy(void)
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{
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sysfs_remove_file(hypervisor_kobj, &vmcoreinfo_attr.attr);
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}
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#endif
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static int __init hyper_sysfs_init(void)
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{
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int ret;
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if (!xen_domain())
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return -ENODEV;
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ret = xen_sysfs_type_init();
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if (ret)
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goto out;
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ret = xen_sysfs_version_init();
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if (ret)
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goto version_out;
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ret = xen_compilation_init();
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if (ret)
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goto comp_out;
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ret = xen_sysfs_uuid_init();
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if (ret)
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goto uuid_out;
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ret = xen_properties_init();
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if (ret)
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goto prop_out;
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#ifdef CONFIG_KEXEC
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if (vmcoreinfo_size_xen != 0) {
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ret = xen_sysfs_vmcoreinfo_init();
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if (ret)
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goto vmcoreinfo_out;
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}
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#endif
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goto out;
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#ifdef CONFIG_KEXEC
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vmcoreinfo_out:
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#endif
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xen_properties_destroy();
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prop_out:
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xen_sysfs_uuid_destroy();
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uuid_out:
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xen_compilation_destroy();
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comp_out:
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xen_sysfs_version_destroy();
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version_out:
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xen_sysfs_type_destroy();
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out:
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return ret;
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}
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static void __exit hyper_sysfs_exit(void)
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{
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#ifdef CONFIG_KEXEC
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if (vmcoreinfo_size_xen != 0)
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xen_sysfs_vmcoreinfo_destroy();
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#endif
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xen_properties_destroy();
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xen_compilation_destroy();
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xen_sysfs_uuid_destroy();
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xen_sysfs_version_destroy();
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xen_sysfs_type_destroy();
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}
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module_init(hyper_sysfs_init);
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module_exit(hyper_sysfs_exit);
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static ssize_t hyp_sysfs_show(struct kobject *kobj,
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struct attribute *attr,
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char *buffer)
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{
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struct hyp_sysfs_attr *hyp_attr;
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hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr);
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if (hyp_attr->show)
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return hyp_attr->show(hyp_attr, buffer);
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return 0;
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}
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static ssize_t hyp_sysfs_store(struct kobject *kobj,
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struct attribute *attr,
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const char *buffer,
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size_t len)
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{
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struct hyp_sysfs_attr *hyp_attr;
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hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr);
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if (hyp_attr->store)
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return hyp_attr->store(hyp_attr, buffer, len);
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return 0;
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}
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static struct sysfs_ops hyp_sysfs_ops = {
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.show = hyp_sysfs_show,
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.store = hyp_sysfs_store,
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};
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static struct kobj_type hyp_sysfs_kobj_type = {
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.sysfs_ops = &hyp_sysfs_ops,
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};
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static int __init hypervisor_subsys_init(void)
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{
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if (!xen_domain())
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return -ENODEV;
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hypervisor_kobj->ktype = &hyp_sysfs_kobj_type;
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return 0;
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}
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device_initcall(hypervisor_subsys_init);
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@ -57,4 +57,7 @@ struct xen_feature_info {
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/* Declares the features reported by XENVER_get_features. */
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#include "features.h"
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/* arg == NULL; returns host memory page size. */
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#define XENVER_pagesize 7
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#endif /* __XEN_PUBLIC_VERSION_H__ */
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