diff --git a/xen/include/xen/hypercall.h b/xen/include/xen/hypercall.h
index 34b7f1fed6..3771487a30 100644
--- a/xen/include/xen/hypercall.h
+++ b/xen/include/xen/hypercall.h
@@ -127,7 +127,7 @@ do_kexec_op(
 
 extern long
 do_xsm_op(
-    XEN_GUEST_HANDLE_PARAM(xsm_op_t) u_xsm_op);
+    XEN_GUEST_HANDLE_PARAM(void) u_xsm_op);
 
 #ifdef CONFIG_ARGO
 extern long do_argo_op(
@@ -198,7 +198,7 @@ compat_set_timer_op(
     s32 hi);
 
 extern int compat_xsm_op(
-    XEN_GUEST_HANDLE_PARAM(xsm_op_t) op);
+    XEN_GUEST_HANDLE_PARAM(void) op);
 
 extern int compat_kexec_op(unsigned long op, XEN_GUEST_HANDLE_PARAM(void) uarg);
 
diff --git a/xen/include/xsm/dummy.h b/xen/include/xsm/dummy.h
index 363c6d7798..214b5408b1 100644
--- a/xen/include/xsm/dummy.h
+++ b/xen/include/xsm/dummy.h
@@ -442,13 +442,13 @@ static XSM_INLINE int xsm_hypfs_op(XSM_DEFAULT_VOID)
     return xsm_default_action(action, current->domain, NULL);
 }
 
-static XSM_INLINE long xsm_do_xsm_op(XEN_GUEST_HANDLE_PARAM(xsm_op_t) op)
+static XSM_INLINE long xsm_do_xsm_op(XEN_GUEST_HANDLE_PARAM(void) op)
 {
     return -ENOSYS;
 }
 
 #ifdef CONFIG_COMPAT
-static XSM_INLINE int xsm_do_compat_op(XEN_GUEST_HANDLE_PARAM(xsm_op_t) op)
+static XSM_INLINE int xsm_do_compat_op(XEN_GUEST_HANDLE_PARAM(void) op)
 {
     return -ENOSYS;
 }
diff --git a/xen/include/xsm/xsm.h b/xen/include/xsm/xsm.h
index 335ba1b022..16b90be2c5 100644
--- a/xen/include/xsm/xsm.h
+++ b/xen/include/xsm/xsm.h
@@ -18,9 +18,6 @@
 #include <xen/sched.h>
 #include <xen/multiboot.h>
 
-typedef void xsm_op_t;
-DEFINE_XEN_GUEST_HANDLE(xsm_op_t);
-
 /* policy magic number (defined by XSM_MAGIC) */
 typedef u32 xsm_magic_t;
 
@@ -129,9 +126,9 @@ struct xsm_operations {
     int (*page_offline)(uint32_t cmd);
     int (*hypfs_op)(void);
 
-    long (*do_xsm_op) (XEN_GUEST_HANDLE_PARAM(xsm_op_t) op);
+    long (*do_xsm_op) (XEN_GUEST_HANDLE_PARAM(void) op);
 #ifdef CONFIG_COMPAT
-    int (*do_compat_op) (XEN_GUEST_HANDLE_PARAM(xsm_op_t) op);
+    int (*do_compat_op) (XEN_GUEST_HANDLE_PARAM(void) op);
 #endif
 
     int (*hvm_param) (struct domain *d, unsigned long op);
@@ -542,13 +539,13 @@ static inline int xsm_hypfs_op(xsm_default_t def)
     return xsm_ops->hypfs_op();
 }
 
-static inline long xsm_do_xsm_op (XEN_GUEST_HANDLE_PARAM(xsm_op_t) op)
+static inline long xsm_do_xsm_op (XEN_GUEST_HANDLE_PARAM(void) op)
 {
     return xsm_ops->do_xsm_op(op);
 }
 
 #ifdef CONFIG_COMPAT
-static inline int xsm_do_compat_op (XEN_GUEST_HANDLE_PARAM(xsm_op_t) op)
+static inline int xsm_do_compat_op (XEN_GUEST_HANDLE_PARAM(void) op)
 {
     return xsm_ops->do_compat_op(op);
 }
diff --git a/xen/xsm/flask/flask_op.c b/xen/xsm/flask/flask_op.c
index f41c025391..221ff00fd3 100644
--- a/xen/xsm/flask/flask_op.c
+++ b/xen/xsm/flask/flask_op.c
@@ -607,7 +607,7 @@ static int flask_relabel_domain(struct xen_flask_relabel *arg)
 
 #endif /* !COMPAT */
 
-ret_t do_flask_op(XEN_GUEST_HANDLE_PARAM(xsm_op_t) u_flask_op)
+ret_t do_flask_op(XEN_GUEST_HANDLE_PARAM(void) u_flask_op)
 {
     xen_flask_op_t op;
     int rv;
diff --git a/xen/xsm/flask/hooks.c b/xen/xsm/flask/hooks.c
index f1a1217c98..1465db125a 100644
--- a/xen/xsm/flask/hooks.c
+++ b/xen/xsm/flask/hooks.c
@@ -1742,8 +1742,8 @@ static int flask_argo_send(const struct domain *d, const struct domain *t)
 
 #endif
 
-long do_flask_op(XEN_GUEST_HANDLE_PARAM(xsm_op_t) u_flask_op);
-int compat_flask_op(XEN_GUEST_HANDLE_PARAM(xsm_op_t) u_flask_op);
+long do_flask_op(XEN_GUEST_HANDLE_PARAM(void) u_flask_op);
+int compat_flask_op(XEN_GUEST_HANDLE_PARAM(void) u_flask_op);
 
 static struct xsm_operations flask_ops = {
     .security_domaininfo = flask_security_domaininfo,
diff --git a/xen/xsm/xsm_core.c b/xen/xsm/xsm_core.c
index 5eab21e1b1..ac553f9c0d 100644
--- a/xen/xsm/xsm_core.c
+++ b/xen/xsm/xsm_core.c
@@ -213,13 +213,13 @@ int __init register_xsm(struct xsm_operations *ops)
 
 #endif
 
-long do_xsm_op (XEN_GUEST_HANDLE_PARAM(xsm_op_t) op)
+long do_xsm_op(XEN_GUEST_HANDLE_PARAM(void) op)
 {
     return xsm_do_xsm_op(op);
 }
 
 #ifdef CONFIG_COMPAT
-int compat_xsm_op (XEN_GUEST_HANDLE_PARAM(xsm_op_t) op)
+int compat_xsm_op(XEN_GUEST_HANDLE_PARAM(void) op)
 {
     return xsm_do_compat_op(op);
 }
