Commit 5c13f806 authored by Daniel De Graaf's avatar Daniel De Graaf Committed by Konrad Rzeszutek Wilk

xen/sysfs: Use XENVER_guest_handle to query UUID

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: default avatarDaniel De Graaf <dgdegra@tycho.nsa.gov>
Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
parent b8b0f559
......@@ -114,7 +114,7 @@ static void xen_sysfs_version_destroy(void)
/* UUID */
static ssize_t uuid_show(struct hyp_sysfs_attr *attr, char *buffer)
static ssize_t uuid_show_fallback(struct hyp_sysfs_attr *attr, char *buffer)
{
char *vm, *val;
int ret;
......@@ -135,6 +135,17 @@ static ssize_t uuid_show(struct hyp_sysfs_attr *attr, char *buffer)
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)
......
......@@ -60,4 +60,7 @@ struct xen_feature_info {
/* arg == NULL; returns host memory page size. */
#define XENVER_pagesize 7
/* arg == xen_domain_handle_t. */
#define XENVER_guest_handle 8
#endif /* __XEN_PUBLIC_VERSION_H__ */
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