[Xen-devel] [RFC 12/14] xen/xsm: Don't use multiboot by default to initialize XSM

[Julien Grall <julien.grall@xxxxxxxxxx>]

Multiboot protocol is only used by x86. When XSM support for ARM will be
introduced, another way will be used to retrieve the policy blob.

Introduce CONFIG_MULTIBOOT to compile XSM specific multiboot code and
rename xsm_init into xsm_multiboot_init to avoid confusion.

Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
Cc: Keir Fraser <keir@xxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
---
 xen/arch/x86/setup.c         |    2 +-
 xen/include/asm-x86/config.h |    2 ++
 xen/include/xsm/xsm.h        |   23 +++++++++++++++--------
 xen/xsm/xsm_core.c           |    9 ++++++---
 xen/xsm/xsm_policy.c         |   10 +++++++---
 5 files changed, 31 insertions(+), 15 deletions(-)

diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c
index 4dbf2b7..e9c2c51 100644
--- a/xen/arch/x86/setup.c
+++ b/xen/arch/x86/setup.c
@@ -1251,7 +1251,7 @@ void __init noreturn __start_xen(unsigned long mbi_p)
     bitmap_fill(module_map, mbi->mods_count);
     __clear_bit(0, module_map); /* Dom0 kernel is always first */
 
-    xsm_init(module_map, mbi, bootstrap_map);
+    xsm_multiboot_init(module_map, mbi, bootstrap_map);
 
     microcode_grab_module(module_map, mbi, bootstrap_map);
 
diff --git a/xen/include/asm-x86/config.h b/xen/include/asm-x86/config.h
index 99d0e2c..24f95a3 100644
--- a/xen/include/asm-x86/config.h
+++ b/xen/include/asm-x86/config.h
@@ -52,6 +52,8 @@
 #define CONFIG_KEXEC 1
 #define CONFIG_WATCHDOG 1
 
+#define CONFIG_MULTIBOOT 1
+
 #define HZ 100
 
 #define OPT_CONSOLE_STR "vga"
diff --git a/xen/include/xsm/xsm.h b/xen/include/xsm/xsm.h
index 15acb3b..4863e41 100644
--- a/xen/include/xsm/xsm.h
+++ b/xen/include/xsm/xsm.h
@@ -643,11 +643,15 @@ static inline int xsm_map_gmfn_foreign (xsm_default_t 
def, struct domain *d, str
 
 #endif /* XSM_NO_WRAPPERS */
 
-extern int xsm_init(unsigned long *module_map, const multiboot_info_t *mbi,
-                    void *(*bootstrap_map)(const module_t *));
-extern int xsm_policy_init(unsigned long *module_map,
-                           const multiboot_info_t *mbi,
-                           void *(*bootstrap_map)(const module_t *));
+#ifdef CONFIG_MULTIBOOT
+extern int xsm_multiboot_init(unsigned long *module_map,
+                              const multiboot_info_t *mbi,
+                              void *(*bootstrap_map)(const module_t *));
+extern int xsm_multiboot_policy_init(unsigned long *module_map,
+                                     const multiboot_info_t *mbi,
+                                     void *(*bootstrap_map)(const module_t *));
+#endif
+
 extern int register_xsm(struct xsm_operations *ops);
 extern int unregister_xsm(struct xsm_operations *ops);
 
@@ -658,12 +662,15 @@ extern void xsm_fixup_ops(struct xsm_operations *ops);
 
 #include <xsm/dummy.h>
 
-static inline int xsm_init (unsigned long *module_map,
-                            const multiboot_info_t *mbi,
-                            void *(*bootstrap_map)(const module_t *))
+#ifdef CONFIG_MULTIBOOT
+static inline int xsm_multiboot_init (unsigned long *module_map,
+                                      const multiboot_info_t *mbi,
+                                      void *(*bootstrap_map)(const module_t *))
 {
     return 0;
 }
+#endif
+
 #endif /* XSM_ENABLE */
 
 #endif /* __XSM_H */
diff --git a/xen/xsm/xsm_core.c b/xen/xsm/xsm_core.c
index b16c071..11a9ca7 100644
--- a/xen/xsm/xsm_core.c
+++ b/xen/xsm/xsm_core.c
@@ -43,8 +43,10 @@ static void __init do_xsm_initcalls(void)
     }
 }
 
-int __init xsm_init(unsigned long *module_map, const multiboot_info_t *mbi,
-                    void *(*bootstrap_map)(const module_t *))
+#ifdef CONFIG_MULTIBOOT
+int __init xsm_multiboot_init(unsigned long *module_map,
+                              const multiboot_info_t *mbi,
+                              void *(*bootstrap_map)(const module_t *))
 {
     int ret = 0;
 
@@ -52,7 +54,7 @@ int __init xsm_init(unsigned long *module_map, const 
multiboot_info_t *mbi,
 
     if ( XSM_MAGIC )
     {
-        ret = xsm_policy_init(module_map, mbi, bootstrap_map);
+        ret = xsm_multiboot_policy_init(module_map, mbi, bootstrap_map);
         if ( ret )
         {
             bootstrap_map(NULL);
@@ -75,6 +77,7 @@ int __init xsm_init(unsigned long *module_map, const 
multiboot_info_t *mbi,
 
     return 0;
 }
+#endif
 
 int register_xsm(struct xsm_operations *ops)
 {
diff --git a/xen/xsm/xsm_policy.c b/xen/xsm/xsm_policy.c
index 0186f30..3d5f66a 100644
--- a/xen/xsm/xsm_policy.c
+++ b/xen/xsm/xsm_policy.c
@@ -19,15 +19,18 @@
  */
 
 #include <xsm/xsm.h>
+#ifdef CONFIG_MULTIBOOT
 #include <xen/multiboot.h>
+#endif
 #include <xen/bitops.h>
 
 char *__initdata policy_buffer = NULL;
 u32 __initdata policy_size = 0;
 
-int __init xsm_policy_init(unsigned long *module_map,
-                           const multiboot_info_t *mbi,
-                           void *(*bootstrap_map)(const module_t *))
+#ifdef CONFIG_MULTIBOOT
+int __init xsm_multiboot_policy_init(unsigned long *module_map,
+                                     const multiboot_info_t *mbi,
+                                     void *(*bootstrap_map)(const module_t *))
 {
     int i;
     module_t *mod = (module_t *)__va(mbi->mods_addr);
@@ -65,3 +68,4 @@ int __init xsm_policy_init(unsigned long *module_map,
 
     return rc;
 }
+#endif
-- 
1.7.10.4


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