x86/hvm: mark save/restore registration code __init

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -995,7 +995,7 @@ static int hvm_load_cpu_xsave_states(str
 /* We need variable length data chunk for xsave area, hence customized
  * declaration other than HVM_REGISTER_SAVE_RESTORE.
  */
-static int __hvm_register_CPU_XSAVE_save_and_restore(void)
+static int __init __hvm_register_CPU_XSAVE_save_and_restore(void)
 {
     hvm_register_savevm(CPU_XSAVE_CODE,
                         "CPU_XSAVE",
--- a/xen/common/hvm/save.c
+++ b/xen/common/hvm/save.c
@@ -40,11 +40,11 @@ static struct { 
 } hvm_sr_handlers [HVM_SAVE_CODE_MAX + 1] = {{NULL, NULL, "<?>"},};
 
 /* Init-time function to add entries to that list */
-void hvm_register_savevm(uint16_t typecode, 
-                         const char *name,
-                         hvm_save_handler save_state,
-                         hvm_load_handler load_state,
-                         size_t size, int kind)
+void __init hvm_register_savevm(uint16_t typecode,
+                                const char *name,
+                                hvm_save_handler save_state,
+                                hvm_load_handler load_state,
+                                size_t size, int kind)
 {
     ASSERT(typecode <= HVM_SAVE_CODE_MAX);
     ASSERT(hvm_sr_handlers[typecode].save == NULL);
--- a/xen/include/xen/hvm/save.h
+++ b/xen/include/xen/hvm/save.h
@@ -19,6 +19,7 @@
 #define __XEN_HVM_SAVE_H__
 
 #include <xen/types.h>
+#include <xen/init.h>
 #include <public/xen.h>
 #include <public/hvm/save.h>
 
@@ -108,7 +109,7 @@ void hvm_register_savevm(uint16_t typeco
 /* Syntactic sugar around that function: specify the max number of
  * saves, and this calculates the size of buffer needed */
 #define HVM_REGISTER_SAVE_RESTORE(_x, _save, _load, _num, _k)             \
-static int __hvm_register_##_x##_save_and_restore(void)                   \
+static int __init __hvm_register_##_x##_save_and_restore(void)            \
 {                                                                         \
     hvm_register_savevm(HVM_SAVE_CODE(_x),                                \
                         #_x,                                              \