[PATCH 16/24] XSM: suppress hypercall when XSM=n

[Jan Beulich <jbeulich@xxxxxxxx>]

This can be easily done in hypercall-defs.c, thus avoiding the need to
dive into xsm/ when building Xen, just to add code which does what is done
for an absent hypercall handler anyway (returning -ENOSYS).

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

--- a/xen/Makefile
+++ b/xen/Makefile
@@ -458,7 +458,7 @@ CFLAGS += -I$(objtree)/arch/$(SRCARCH)/i
 ALL_OBJS-y                := common/built_in.o
 ALL_OBJS-y                += drivers/built_in.o
 ALL_OBJS-y                += lib/built_in.o
-ALL_OBJS-y                += xsm/built_in.o
+ALL_OBJS-$(CONFIG_XSM)    += xsm/built_in.o
 ALL_OBJS-y                += arch/$(SRCARCH)/built_in.o
 ALL_OBJS-$(CONFIG_CRYPTO) += crypto/built_in.o
 
--- a/xen/include/hypercall-defs.c
+++ b/xen/include/hypercall-defs.c
@@ -119,7 +119,9 @@ prefix: do PREFIX_compat
 xen_version(int cmd, void *arg)
 vcpu_op(int cmd, unsigned int vcpuid, void *arg)
 sched_op(int cmd, void *arg)
+#ifdef CONFIG_XSM
 xsm_op(void *op)
+#endif
 callback_op(int cmd, const void *arg)
 #ifdef CONFIG_ARGO
 argo_op(unsigned int cmd, void *arg1, void *arg2, unsigned long arg3, unsigned 
long arg4)
@@ -264,7 +266,9 @@ set_segment_base                   do:2
 #ifdef CONFIG_PV
 mmuext_op                          compat:2 do:2     compat   do       -
 #endif
+#ifdef CONFIG_XSM
 xsm_op                             compat   do       compat   do       do
+#endif
 nmi_op                             compat   do       -        -        -
 sched_op                           compat   do       compat   do       do
 callback_op                        compat   do       -        -        -
--- a/xen/include/xsm/dummy.h
+++ b/xen/include/xsm/dummy.h
@@ -437,6 +437,8 @@ static XSM_INLINE int xsm_hypfs_op(XSM_D
 }
 #endif
 
+#ifdef CONFIG_XSM
+
 static XSM_INLINE long xsm_do_xsm_op(XEN_GUEST_HANDLE_PARAM(void) op)
 {
     return -ENOSYS;
@@ -449,6 +451,8 @@ static XSM_INLINE int xsm_do_compat_op(X
 }
 #endif
 
+#endif /* CONFIG_XSM */
+
 static XSM_INLINE char *xsm_show_irq_sid(int irq)
 {
     return NULL;
--- a/xen/xsm/Makefile
+++ b/xen/xsm/Makefile
@@ -1,6 +1,6 @@
 obj-y += xsm_core.o
-obj-$(CONFIG_XSM) += xsm_policy.o
-obj-$(CONFIG_XSM) += dummy.o
+obj-y += xsm_policy.o
+obj-y += dummy.o
 obj-$(CONFIG_XSM_SILO) += silo.o
 
 obj-$(CONFIG_XSM_FLASK) += flask/
--- a/xen/xsm/xsm_core.c
+++ b/xen/xsm/xsm_core.c
@@ -18,8 +18,6 @@
 #include <xen/hypercall.h>
 #include <xsm/xsm.h>
 
-#ifdef CONFIG_XSM
-
 #ifdef CONFIG_MULTIBOOT
 #include <asm/bootinfo.h>
 #include <asm/setup.h>
@@ -216,8 +214,6 @@ bool __init has_xsm_magic(paddr_t start)
 }
 #endif
 
-#endif
-
 long do_xsm_op(XEN_GUEST_HANDLE_PARAM(void) op)
 {
     return xsm_do_xsm_op(op);