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: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
diff --git a/include/xen/interface/version.h b/include/xen/interface/version.h
index e8b6519..dd58cf5 100644
--- a/include/xen/interface/version.h
+++ b/include/xen/interface/version.h
@@ -60,4 +60,7 @@
/* 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__ */