The patch titled
Subject: x86/mm: move protection_map[] inside the platform
has been added to the -mm mm-unstable branch. Its filename is
x86-mm-move-protection_map-inside-the-platform.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/x86-mm-move-protection_map-inside-the-platform.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Subject: x86/mm: move protection_map[] inside the platform
Date: Thu, 30 Jun 2022 10:46:10 +0530
This moves protection_map[] inside the platform and makes it a static.
This also defines a helper function add_encrypt_protection_map() that can
update the protection_map[] array with pgprot_encrypted().
Link: https://lkml.kernel.org/r/20220630051630.1718927-7-anshuman.khandual@xxxxxxx
Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/include/asm/pgtable_types.h | 19 -----------------
arch/x86/mm/mem_encrypt_amd.c | 7 ++----
arch/x86/mm/pgprot.c | 27 +++++++++++++++++++++++++
3 files changed, 30 insertions(+), 23 deletions(-)
--- a/arch/x86/include/asm/pgtable_types.h~x86-mm-move-protection_map-inside-the-platform
+++ a/arch/x86/include/asm/pgtable_types.h
@@ -230,25 +230,6 @@ enum page_cache_mode {
#endif /* __ASSEMBLY__ */
-/* xwr */
-#define __P000 PAGE_NONE
-#define __P001 PAGE_READONLY
-#define __P010 PAGE_COPY
-#define __P011 PAGE_COPY
-#define __P100 PAGE_READONLY_EXEC
-#define __P101 PAGE_READONLY_EXEC
-#define __P110 PAGE_COPY_EXEC
-#define __P111 PAGE_COPY_EXEC
-
-#define __S000 PAGE_NONE
-#define __S001 PAGE_READONLY
-#define __S010 PAGE_SHARED
-#define __S011 PAGE_SHARED
-#define __S100 PAGE_READONLY_EXEC
-#define __S101 PAGE_READONLY_EXEC
-#define __S110 PAGE_SHARED_EXEC
-#define __S111 PAGE_SHARED_EXEC
-
/*
* early identity mapping pte attrib macros.
*/
--- a/arch/x86/mm/mem_encrypt_amd.c~x86-mm-move-protection_map-inside-the-platform
+++ a/arch/x86/mm/mem_encrypt_amd.c
@@ -484,10 +484,10 @@ void __init early_set_mem_enc_dec_hyperc
enc_dec_hypercall(vaddr, npages, enc);
}
+void add_encrypt_protection_map(void);
+
void __init sme_early_init(void)
{
- unsigned int i;
-
if (!sme_me_mask)
return;
@@ -496,8 +496,7 @@ void __init sme_early_init(void)
__supported_pte_mask = __sme_set(__supported_pte_mask);
/* Update the protection map with memory encryption mask */
- for (i = 0; i < ARRAY_SIZE(protection_map); i++)
- protection_map[i] = pgprot_encrypted(protection_map[i]);
+ add_encrypt_protection_map();
x86_platform.guest.enc_status_change_prepare = amd_enc_status_change_prepare;
x86_platform.guest.enc_status_change_finish = amd_enc_status_change_finish;
--- a/arch/x86/mm/pgprot.c~x86-mm-move-protection_map-inside-the-platform
+++ a/arch/x86/mm/pgprot.c
@@ -4,6 +4,33 @@
#include <linux/mm.h>
#include <asm/pgtable.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)
{
unsigned long val = pgprot_val(protection_map[vm_flags &
_
Patches currently in -mm which might be from anshuman.khandual@xxxxxxx are
mm-mmap-build-protect-protection_map-with-__p000.patch
mm-mmap-define-declare_vm_get_page_prot.patch
powerpc-mm-move-protection_map-inside-the-platform.patch
sparc-mm-move-protection_map-inside-the-platform.patch
arm64-mm-move-protection_map-inside-the-platform.patch
x86-mm-move-protection_map-inside-the-platform.patch
mm-mmap-build-protect-protection_map-with-arch_has_vm_get_page_prot.patch
microblaze-mm-enable-arch_has_vm_get_page_prot.patch
loongarch-mm-enable-arch_has_vm_get_page_prot.patch
openrisc-mm-enable-arch_has_vm_get_page_prot.patch
xtensa-mm-enable-arch_has_vm_get_page_prot.patch
hexagon-mm-enable-arch_has_vm_get_page_prot.patch
parisc-mm-enable-arch_has_vm_get_page_prot.patch
alpha-mm-enable-arch_has_vm_get_page_prot.patch
nios2-mm-enable-arch_has_vm_get_page_prot.patch
riscv-mm-enable-arch_has_vm_get_page_prot.patch
csky-mm-enable-arch_has_vm_get_page_prot.patch
s390-mm-enable-arch_has_vm_get_page_prot.patch
ia64-mm-enable-arch_has_vm_get_page_prot.patch
mips-mm-enable-arch_has_vm_get_page_prot.patch
m68k-mm-enable-arch_has_vm_get_page_prot.patch
arc-mm-enable-arch_has_vm_get_page_prot.patch
arm-mm-enable-arch_has_vm_get_page_prot.patch
um-mm-enable-arch_has_vm_get_page_prot.patch
sh-mm-enable-arch_has_vm_get_page_prot.patch
mm-mmap-drop-arch_has_vm_get_page_prot.patch
