New /sys/hypervisor/uuid, containing this domain's UUID.
Stripping off /vm/ from the value of vm to get the UUID isn't exactly
nice. The alternative is to add a XENVER_get_uuid code to
HYPERVISOR_xen_version(), but I'm not sure that's worth it.
Signed-off-by: Markus Armbruster <armbru@xxxxxxxxxx>
diff -r ddba92a5cba9 drivers/xen/core/xen_sysfs.c
--- a/drivers/xen/core/xen_sysfs.c Tue May 09 12:41:38 2006 +0200
+++ b/drivers/xen/core/xen_sysfs.c Thu May 18 18:06:35 2006 +0200
@@ -8,12 +8,14 @@
*/
#include <linux/config.h>
+#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <asm/hypervisor.h>
#include <xen/features.h>
#include <xen/hypervisor_sysfs.h>
+#include <xen/xenbus.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mike D. Day <ncmike@xxxxxxxxxx>");
@@ -92,6 +94,37 @@ static void xen_sysfs_version_destroy(vo
static void xen_sysfs_version_destroy(void)
{
sysfs_remove_group(&hypervisor_subsys.kset.kobj, &version_group);
+}
+
+/* UUID */
+
+static ssize_t uuid_show(struct hyp_sysfs_attr *attr, char *buffer)
+{
+ char *val;
+ int ret;
+
+ val = xenbus_read(XBT_NULL, "vm", "", NULL);
+ if (IS_ERR(val))
+ ret = PTR_ERR(val);
+ else if (strncmp(val, "/vm/", 4))
+ ret = -EIO;
+ else
+ ret = sprintf(buffer, "%s\n", val + 4);
+ kfree(val);
+
+ return ret;
+}
+
+HYPERVISOR_ATTR_RO(uuid);
+
+static int __init xen_sysfs_uuid_init(void)
+{
+ return sysfs_create_file(&hypervisor_subsys.kset.kobj, &uuid_attr.attr);
+}
+
+static void xen_sysfs_uuid_destroy(void)
+{
+ sysfs_remove_file(&hypervisor_subsys.kset.kobj, &uuid_attr.attr);
}
/* xen compilation attributes */
@@ -285,10 +318,15 @@ static int __init hyper_sysfs_init(void)
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 out;
+ xen_sysfs_uuid_destroy();
+uuid_out:
xen_compilation_destroy();
comp_out:
xen_sysfs_version_destroy();
@@ -302,6 +340,7 @@ static void hyper_sysfs_exit(void)
{
xen_properties_destroy();
xen_compilation_destroy();
+ xen_sysfs_uuid_destroy();
xen_sysfs_version_destroy();
xen_sysfs_type_destroy();
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