1 files changed, 45 insertions, 5 deletions

diff --git a/arch/s390/include/asm/page.h b/arch/s390/include/asm/page.h
index 9381879f7e..224ff9d433 100644
--- a/arch/s390/include/asm/page.h
+++ b/arch/s390/include/asm/page.h
@@ -178,19 +178,52 @@ int arch_make_page_accessible(struct page *page);
 #define HAVE_ARCH_MAKE_PAGE_ACCESSIBLE
 #endif
 
-#define __PAGE_OFFSET		0x0UL
-#define PAGE_OFFSET		0x0UL
+struct vm_layout {
+	unsigned long kaslr_offset;
+	unsigned long kaslr_offset_phys;
+	unsigned long identity_base;
+	unsigned long identity_size;
+};
 
-#define __pa_nodebug(x)		((unsigned long)(x))
+extern struct vm_layout vm_layout;
+
+#define __kaslr_offset		vm_layout.kaslr_offset
+#define __kaslr_offset_phys	vm_layout.kaslr_offset_phys
+#define __identity_base		vm_layout.identity_base
+#define ident_map_size		vm_layout.identity_size
+
+static inline unsigned long kaslr_offset(void)
+{
+	return __kaslr_offset;
+}
+
+extern int __kaslr_enabled;
+static inline int kaslr_enabled(void)
+{
+	if (IS_ENABLED(CONFIG_RANDOMIZE_BASE))
+		return __kaslr_enabled;
+	return 0;
+}
+
+#define __PAGE_OFFSET		__identity_base
+#define PAGE_OFFSET		__PAGE_OFFSET
 
 #ifdef __DECOMPRESSOR
 
+#define __pa_nodebug(x)		((unsigned long)(x))
 #define __pa(x)			__pa_nodebug(x)
 #define __pa32(x)		__pa(x)
 #define __va(x)			((void *)(unsigned long)(x))
 
 #else /* __DECOMPRESSOR */
 
+static inline unsigned long __pa_nodebug(unsigned long x)
+{
+	if (x < __kaslr_offset)
+		return x - __identity_base;
+	return x - __kaslr_offset + __kaslr_offset_phys;
+}
+
 #ifdef CONFIG_DEBUG_VIRTUAL
 
 unsigned long __phys_addr(unsigned long x, bool is_31bit);
@@ -206,7 +239,7 @@ static inline unsigned long __phys_addr(unsigned long x, bool is_31bit)
 
 #define __pa(x)			__phys_addr((unsigned long)(x), false)
 #define __pa32(x)		__phys_addr((unsigned long)(x), true)
-#define __va(x)			((void *)(unsigned long)(x))
+#define __va(x)			((void *)((unsigned long)(x) + __identity_base))
 
 #endif /* __DECOMPRESSOR */
 
@@ -231,7 +264,7 @@ static inline unsigned long virt_to_pfn(const void *kaddr)
 #define virt_to_page(kaddr)	pfn_to_page(virt_to_pfn(kaddr))
 #define page_to_virt(page)	pfn_to_virt(page_to_pfn(page))
 
-#define virt_addr_valid(kaddr)	pfn_valid(phys_to_pfn(__pa_nodebug(kaddr)))
+#define virt_addr_valid(kaddr)	pfn_valid(phys_to_pfn(__pa_nodebug((unsigned long)(kaddr))))
 
 #define VM_DATA_DEFAULT_FLAGS	VM_DATA_FLAGS_NON_EXEC
 
@@ -240,4 +273,11 @@ static inline unsigned long virt_to_pfn(const void *kaddr)
 #include <asm-generic/memory_model.h>
 #include <asm-generic/getorder.h>
 
+#define AMODE31_SIZE		(3 * PAGE_SIZE)
+
+#define KERNEL_IMAGE_SIZE	(512 * 1024 * 1024)
+#define __START_KERNEL		0x100000
+#define __NO_KASLR_START_KERNEL	CONFIG_KERNEL_IMAGE_BASE
+#define __NO_KASLR_END_KERNEL	(__NO_KASLR_START_KERNEL + KERNEL_IMAGE_SIZE)
+
 #endif /* _S390_PAGE_H */