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Commit cff7e81b authored by Jeremy Fitzhardinge's avatar Jeremy Fitzhardinge
Browse files

xen: add /sys/hypervisor support 



Adds support for Xen info under /sys/hypervisor.  Taken from Novell 2.6.27
backport tree.

Signed-off-by: default avatarJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
parent 6d02c426

drivers/xen/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -41,3 +41,13 @@ config XEN_COMPAT_XENFS 
         a xen platform.

         If in doubt, say yes.



config XEN_SYS_HYPERVISOR

       bool "Create xen entries under /sys/hypervisor"

       depends on XEN && SYSFS

       select SYS_HYPERVISOR

       default y

       help

         Create entries under /sys/hypervisor describing the Xen

	 hypervisor environment.  When running native or in another

	 virtual environment, /sys/hypervisor will still be present,

	 but will have no xen contents.
 
 No newline at end of file

drivers/xen/Makefile

+2 −1
Original line number Diff line number Diff line
@@ -5,3 +5,4 @@ obj-$(CONFIG_HOTPLUG_CPU) += cpu_hotplug.o 
obj-$(CONFIG_XEN_XENCOMM)	+= xencomm.o

obj-$(CONFIG_XEN_BALLOON)	+= balloon.o

obj-$(CONFIG_XENFS)		+= xenfs/

obj-$(CONFIG_XEN_SYS_HYPERVISOR)	+= sys-hypervisor.o

drivers/xen/sys-hypervisor.c

0 → 100644
+475 −0
Original line number Diff line number Diff line 
/*

 *  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/kernel.h>

#include <linux/module.h>

#include <linux/kobject.h>



#include <asm/xen/hypervisor.h>

#include <asm/xen/hypercall.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 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(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;

}



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 struct attribute_group xen_compilation_group = {

	.name = "compilation",

	.attrs = xen_compile_attrs,

};



int __init static 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);



/* eventually there will be several more features to export */

static ssize_t xen_feature_show(int index, char *buffer)

{

	int ret = -ENOMEM;

	struct xen_feature_info *info;



	info = kmalloc(sizeof(struct xen_feature_info), GFP_KERNEL);

	if (info) {

		info->submap_idx = index;

		ret = HYPERVISOR_xen_version(XENVER_get_features, info);

		if (!ret)

			ret = sprintf(buffer, "%d\n", info->submap);

		kfree(info);

	}



	return ret;

}



static ssize_t writable_pt_show(struct hyp_sysfs_attr *attr, char *buffer)

{

	return xen_feature_show(XENFEAT_writable_page_tables, buffer);

}



HYPERVISOR_ATTR_RO(writable_pt);



static struct attribute *xen_properties_attrs[] = {

	&capabilities_attr.attr,

	&changeset_attr.attr,

	&virtual_start_attr.attr,

	&pagesize_attr.attr,

	&writable_pt_attr.attr,

	NULL

};



static 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);

}



#ifdef CONFIG_KEXEC



extern size_t vmcoreinfo_size_xen;

extern unsigned long paddr_vmcoreinfo_xen;



static ssize_t vmcoreinfo_show(struct hyp_sysfs_attr *attr, char *page)

{

	return sprintf(page, "%lx %zx\n",

		paddr_vmcoreinfo_xen, vmcoreinfo_size_xen);

}



HYPERVISOR_ATTR_RO(vmcoreinfo);



static int __init xen_sysfs_vmcoreinfo_init(void)

{

	return sysfs_create_file(hypervisor_kobj,

				 &vmcoreinfo_attr.attr);

}



static void xen_sysfs_vmcoreinfo_destroy(void)

{

	sysfs_remove_file(hypervisor_kobj, &vmcoreinfo_attr.attr);

}



#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_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;

#ifdef CONFIG_KEXEC

	if (vmcoreinfo_size_xen != 0) {

		ret = xen_sysfs_vmcoreinfo_init();

		if (ret)

			goto vmcoreinfo_out;

	}

#endif



	goto out;



#ifdef CONFIG_KEXEC

vmcoreinfo_out:

#endif

	xen_properties_destroy();

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)

{

#ifdef CONFIG_KEXEC

	if (vmcoreinfo_size_xen != 0)

		xen_sysfs_vmcoreinfo_destroy();

#endif

	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 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);

include/xen/interface/version.h

+3 −0
Original line number Diff line number Diff line
@@ -57,4 +57,7 @@ struct xen_feature_info { 
/* Declares the features reported by XENVER_get_features. */

#include "features.h"



/* arg == NULL; returns host memory page size. */

#define XENVER_pagesize 7



#endif /* __XEN_PUBLIC_VERSION_H__ */