x86/xen: create stubs for HVM-only builds in page.h

__pfn_to_mfn() is only used from PV code (mmu_pv.c, p2m.c) and from
page.h where all functions calling it check for
xen_feature(XENFEAT_auto_translated_physmap) first so we can replace
it with any stub to make build happy.

set_foreign_p2m_mapping()/clear_foreign_p2m_mapping() are used from
grant-table.c but only if !xen_feature(XENFEAT_auto_translated_physmap).

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>

diff --git a/arch/x86/include/asm/xen/page.h b/arch/x86/include/asm/xen/page.h
index 8a5a02b..8417ef7 100644 (file)
--- a/arch/x86/include/asm/xen/page.h
+++ b/arch/x86/include/asm/xen/page.h
@@ -52,12 +52,30 @@ extern bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);
 extern unsigned long __init set_phys_range_identity(unsigned long pfn_s,
                                                    unsigned long pfn_e);
 
+#ifdef CONFIG_XEN_PV
 extern int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
                                   struct gnttab_map_grant_ref *kmap_ops,
                                   struct page **pages, unsigned int count);
 extern int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
                                     struct gnttab_unmap_grant_ref *kunmap_ops,
                                     struct page **pages, unsigned int count);
+#else
+static inline int
+set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
+                       struct gnttab_map_grant_ref *kmap_ops,
+                       struct page **pages, unsigned int count)
+{
+       return 0;
+}
+
+static inline int
+clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
+                         struct gnttab_unmap_grant_ref *kunmap_ops,
+                         struct page **pages, unsigned int count)
+{
+       return 0;
+}
+#endif
 
 /*
  * Helper functions to write or read unsigned long values to/from
@@ -73,6 +91,7 @@ static inline int xen_safe_read_ulong(unsigned long *addr, unsigned long *val)
        return __get_user(*val, (unsigned long __user *)addr);
 }
 
+#ifdef CONFIG_XEN_PV
 /*
  * When to use pfn_to_mfn(), __pfn_to_mfn() or get_phys_to_machine():
  * - pfn_to_mfn() returns either INVALID_P2M_ENTRY or the mfn. No indicator
@@ -99,6 +118,12 @@ static inline unsigned long __pfn_to_mfn(unsigned long pfn)
 
        return mfn;
 }
+#else
+static inline unsigned long __pfn_to_mfn(unsigned long pfn)
+{
+       return pfn;
+}
+#endif
 
 static inline unsigned long pfn_to_mfn(unsigned long pfn)
 {