The patch titled
Subject: x86/mm: enable ARCH_HAS_VM_GET_PAGE_PROT
has been added to the -mm tree. Its filename is
x86-mm-enable-arch_has_vm_get_page_prot.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/x86-mm-enable-arch_has_vm_get_page_prot.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/x86-mm-enable-arch_has_vm_get_page_prot.patch
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Subject: x86/mm: enable ARCH_HAS_VM_GET_PAGE_PROT
This defines and exports a platform specific custom vm_get_page_prot() via
subscribing ARCH_HAS_VM_GET_PAGE_PROT. Subsequently all __SXXX and __PXXX
macros can be dropped which are no longer needed. This also unsubscribes
from ARCH_HAS_FILTER_PGPROT, after dropping off arch_filter_pgprot() and
arch_vm_get_page_prot().
Link: https://lkml.kernel.org/r/1645425519-9034-11-git-send-email-anshuman.khandual@xxxxxxx
Signed-off-by: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/Kconfig | 2
arch/x86/include/asm/pgtable.h | 5 -
arch/x86/include/asm/pgtable_types.h | 19 ------
arch/x86/include/uapi/asm/mman.h | 14 ----
arch/x86/mm/Makefile | 2
arch/x86/mm/mem_encrypt_amd.c | 4 -
arch/x86/mm/pgprot.c | 71 +++++++++++++++++++++++++
7 files changed, 73 insertions(+), 44 deletions(-)
--- a/arch/x86/include/asm/pgtable.h~x86-mm-enable-arch_has_vm_get_page_prot
+++ a/arch/x86/include/asm/pgtable.h
@@ -648,11 +648,6 @@ static inline pgprot_t pgprot_modify(pgp
#define canon_pgprot(p) __pgprot(massage_pgprot(p))
-static inline pgprot_t arch_filter_pgprot(pgprot_t prot)
-{
- return canon_pgprot(prot);
-}
-
static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
enum page_cache_mode pcm,
enum page_cache_mode new_pcm)
--- a/arch/x86/include/asm/pgtable_types.h~x86-mm-enable-arch_has_vm_get_page_prot
+++ a/arch/x86/include/asm/pgtable_types.h
@@ -228,25 +228,6 @@ 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/include/uapi/asm/mman.h~x86-mm-enable-arch_has_vm_get_page_prot
+++ a/arch/x86/include/uapi/asm/mman.h
@@ -5,20 +5,6 @@
#define MAP_32BIT 0x40 /* only give out 32bit addresses */
#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
-/*
- * Take the 4 protection key bits out of the vma->vm_flags
- * value and turn them in to the bits that we can put in
- * to a pte.
- *
- * Only override these if Protection Keys are available
- * (which is only on 64-bit).
- */
-#define arch_vm_get_page_prot(vm_flags) __pgprot( \
- ((vm_flags) & VM_PKEY_BIT0 ? _PAGE_PKEY_BIT0 : 0) | \
- ((vm_flags) & VM_PKEY_BIT1 ? _PAGE_PKEY_BIT1 : 0) | \
- ((vm_flags) & VM_PKEY_BIT2 ? _PAGE_PKEY_BIT2 : 0) | \
- ((vm_flags) & VM_PKEY_BIT3 ? _PAGE_PKEY_BIT3 : 0))
-
#define arch_calc_vm_prot_bits(prot, key) ( \
((key) & 0x1 ? VM_PKEY_BIT0 : 0) | \
((key) & 0x2 ? VM_PKEY_BIT1 : 0) | \
--- a/arch/x86/Kconfig~x86-mm-enable-arch_has_vm_get_page_prot
+++ a/arch/x86/Kconfig
@@ -75,7 +75,6 @@ config X86
select ARCH_HAS_EARLY_DEBUG if KGDB
select ARCH_HAS_ELF_RANDOMIZE
select ARCH_HAS_FAST_MULTIPLIER
- select ARCH_HAS_FILTER_PGPROT
select ARCH_HAS_FORTIFY_SOURCE
select ARCH_HAS_GCOV_PROFILE_ALL
select ARCH_HAS_KCOV if X86_64
@@ -94,6 +93,7 @@ config X86
select ARCH_HAS_SYNC_CORE_BEFORE_USERMODE
select ARCH_HAS_SYSCALL_WRAPPER
select ARCH_HAS_UBSAN_SANITIZE_ALL
+ select ARCH_HAS_VM_GET_PAGE_PROT
select ARCH_HAS_DEBUG_WX
select ARCH_HAS_ZONE_DMA_SET if EXPERT
select ARCH_HAVE_NMI_SAFE_CMPXCHG
--- a/arch/x86/mm/Makefile~x86-mm-enable-arch_has_vm_get_page_prot
+++ a/arch/x86/mm/Makefile
@@ -20,7 +20,7 @@ CFLAGS_REMOVE_mem_encrypt_identity.o = -
endif
obj-y := init.o init_$(BITS).o fault.o ioremap.o extable.o mmap.o \
- pgtable.o physaddr.o setup_nx.o tlb.o cpu_entry_area.o maccess.o
+ pgtable.o physaddr.o setup_nx.o tlb.o cpu_entry_area.o maccess.o pgprot.o
obj-y += pat/
--- a/arch/x86/mm/mem_encrypt_amd.c~x86-mm-enable-arch_has_vm_get_page_prot
+++ a/arch/x86/mm/mem_encrypt_amd.c
@@ -188,10 +188,6 @@ 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]);
-
if (cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT))
swiotlb_force = SWIOTLB_FORCE;
}
--- /dev/null
+++ a/arch/x86/mm/pgprot.c
@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/export.h>
+#include <linux/mm.h>
+#include <asm/pgtable.h>
+
+static inline pgprot_t __vm_get_page_prot(unsigned long vm_flags)
+{
+ switch (vm_flags & (VM_READ | VM_WRITE | VM_EXEC | VM_SHARED)) {
+ case VM_NONE:
+ return PAGE_NONE;
+ case VM_READ:
+ return PAGE_READONLY;
+ case VM_WRITE:
+ return PAGE_COPY;
+ case VM_WRITE | VM_READ:
+ return PAGE_COPY;
+ case VM_EXEC:
+ case VM_EXEC | VM_READ:
+ return PAGE_READONLY_EXEC;
+ case VM_EXEC | VM_WRITE:
+ case VM_EXEC | VM_WRITE | VM_READ:
+ return PAGE_COPY_EXEC;
+ case VM_SHARED:
+ return PAGE_NONE;
+ case VM_SHARED | VM_READ:
+ return PAGE_READONLY;
+ case VM_SHARED | VM_WRITE:
+ case VM_SHARED | VM_WRITE | VM_READ:
+ return PAGE_SHARED;
+ case VM_SHARED | VM_EXEC:
+ case VM_SHARED | VM_EXEC | VM_READ:
+ return PAGE_READONLY_EXEC;
+ case VM_SHARED | VM_EXEC | VM_WRITE:
+ case VM_SHARED | VM_EXEC | VM_WRITE | VM_READ:
+ return PAGE_SHARED_EXEC;
+ default:
+ BUILD_BUG();
+ return PAGE_NONE;
+ }
+}
+
+
+pgprot_t vm_get_page_prot(unsigned long vm_flags)
+{
+ unsigned long val = pgprot_val(__vm_get_page_prot(vm_flags));
+
+#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
+ /*
+ * Take the 4 protection key bits out of the vma->vm_flags value and
+ * turn them in to the bits that we can put in to a pte.
+ *
+ * Only override these if Protection Keys are available (which is only
+ * on 64-bit).
+ */
+ if (vm_flags & VM_PKEY_BIT0)
+ val |= _PAGE_PKEY_BIT0;
+ if (vm_flags & VM_PKEY_BIT1)
+ val |= _PAGE_PKEY_BIT1;
+ if (vm_flags & VM_PKEY_BIT2)
+ val |= _PAGE_PKEY_BIT2;
+ if (vm_flags & VM_PKEY_BIT3)
+ val |= _PAGE_PKEY_BIT3;
+#endif
+
+ val = __sme_set(val);
+ if (val & _PAGE_PRESENT)
+ val &= __supported_pte_mask;
+ return __pgprot(val);
+}
+EXPORT_SYMBOL(vm_get_page_prot);
_
Patches currently in -mm which might be from hch@xxxxxxxxxxxxx are
x86-mm-enable-arch_has_vm_get_page_prot.patch
