Merge tag 'mm-stable-2022-08-03' of git://git.kernel.org/pub/scm/linux/kernel/git...

[sfrench/cifs-2.6.git] / arch / x86 / mm / pgprot.c

diff --git a/arch/x86/mm/pgprot.c b/arch/x86/mm/pgprot.c
index 7637427822866c7baaabda956a89ed3aabc6df17..c84bd9540b163dbcda2f34ed3644bfc661e4ae82 100644 (file)
--- a/arch/x86/mm/pgprot.c
+++ b/arch/x86/mm/pgprot.c
@@ -3,6 +3,34 @@
 #include <linux/export.h>
 #include <linux/mm.h>
 #include <asm/pgtable.h>
+#include <asm/mem_encrypt.h>
+
+static pgprot_t protection_map[16] __ro_after_init = {
+       [VM_NONE]                                       = PAGE_NONE,
+       [VM_READ]                                       = PAGE_READONLY,
+       [VM_WRITE]                                      = PAGE_COPY,
+       [VM_WRITE | VM_READ]                            = PAGE_COPY,
+       [VM_EXEC]                                       = PAGE_READONLY_EXEC,
+       [VM_EXEC | VM_READ]                             = PAGE_READONLY_EXEC,
+       [VM_EXEC | VM_WRITE]                            = PAGE_COPY_EXEC,
+       [VM_EXEC | VM_WRITE | VM_READ]                  = PAGE_COPY_EXEC,
+       [VM_SHARED]                                     = PAGE_NONE,
+       [VM_SHARED | VM_READ]                           = PAGE_READONLY,
+       [VM_SHARED | VM_WRITE]                          = PAGE_SHARED,
+       [VM_SHARED | VM_WRITE | VM_READ]                = PAGE_SHARED,
+       [VM_SHARED | VM_EXEC]                           = PAGE_READONLY_EXEC,
+       [VM_SHARED | VM_EXEC | VM_READ]                 = PAGE_READONLY_EXEC,
+       [VM_SHARED | VM_EXEC | VM_WRITE]                = PAGE_SHARED_EXEC,
+       [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ]      = PAGE_SHARED_EXEC
+};
+
+void add_encrypt_protection_map(void)
+{
+       unsigned int i;
+
+       for (i = 0; i < ARRAY_SIZE(protection_map); i++)
+               protection_map[i] = pgprot_encrypted(protection_map[i]);
+}
 
 pgprot_t vm_get_page_prot(unsigned long vm_flags)
 {