[PATCH v1 09/20] arm64: define VM_PKEY_BIT* for arm64

[Joey Gouly]

Define the VM_PKEY_BIT* values for arm64, and convert them into the arm64
specific pgprot values.

Signed-off-by: Joey Gouly <joey.gouly at arm.com>
Cc: Catalin Marinas <catalin.marinas at arm.com>
Cc: Will Deacon <will at kernel.org>
---
 arch/arm64/include/asm/mman.h |  6 +++++-
 arch/arm64/mm/mmap.c          |  7 +++++++
 fs/proc/task_mmu.c            |  2 ++
 include/linux/mm.h            | 11 ++++++++++-
 4 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/include/asm/mman.h b/arch/arm64/include/asm/mman.h
index 5966ee4a6154..22de55518913 100644
--- a/arch/arm64/include/asm/mman.h
+++ b/arch/arm64/include/asm/mman.h
@@ -7,7 +7,7 @@
 #include <uapi/asm/mman.h>
 
 static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot,
-	unsigned long pkey __always_unused)
+	unsigned long pkey)
 {
 	unsigned long ret = 0;
 
@@ -17,6 +17,10 @@ static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot,
 	if (system_supports_mte() && (prot & PROT_MTE))
 		ret |= VM_MTE;
 
+	ret |= pkey & 0x1 ? VM_PKEY_BIT0 : 0;
+	ret |= pkey & 0x2 ? VM_PKEY_BIT1 : 0;
+	ret |= pkey & 0x4 ? VM_PKEY_BIT2 : 0;
+
 	return ret;
 }
 #define arch_calc_vm_prot_bits(prot, pkey) arch_calc_vm_prot_bits(prot, pkey)
diff --git a/arch/arm64/mm/mmap.c b/arch/arm64/mm/mmap.c
index 8f5b7ce857ed..ef75b04f9d02 100644
--- a/arch/arm64/mm/mmap.c
+++ b/arch/arm64/mm/mmap.c
@@ -98,6 +98,13 @@ pgprot_t vm_get_page_prot(unsigned long vm_flags)
 	if (vm_flags & VM_MTE)
 		prot |= PTE_ATTRINDX(MT_NORMAL_TAGGED);
 
+	if (vm_flags & VM_PKEY_BIT0)
+		prot |= PTE_PO_IDX_0;
+	if (vm_flags & VM_PKEY_BIT1)
+		prot |= PTE_PO_IDX_1;
+	if (vm_flags & VM_PKEY_BIT2)
+		prot |= PTE_PO_IDX_2;
+
 	return __pgprot(prot);
 }
 EXPORT_SYMBOL(vm_get_page_prot);
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 3dd5be96691b..fcd94a39bb30 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -689,7 +689,9 @@ static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma)
 		[ilog2(VM_PKEY_BIT0)]	= "",
 		[ilog2(VM_PKEY_BIT1)]	= "",
 		[ilog2(VM_PKEY_BIT2)]	= "",
+#if VM_PKEY_BIT3
 		[ilog2(VM_PKEY_BIT3)]	= "",
+#endif
 #if VM_PKEY_BIT4
 		[ilog2(VM_PKEY_BIT4)]	= "",
 #endif
diff --git a/include/linux/mm.h b/include/linux/mm.h
index bf5d0b1b16f4..43d96c925b9b 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -328,7 +328,7 @@ extern unsigned int kobjsize(const void *objp);
 #define VM_HIGH_ARCH_5	BIT(VM_HIGH_ARCH_BIT_5)
 #endif /* CONFIG_ARCH_USES_HIGH_VMA_FLAGS */
 
-#ifdef CONFIG_ARCH_HAS_PKEYS
+#if defined(CONFIG_ARCH_HAS_PKEYS) && !defined(CONFIG_ARM64)
 # define VM_PKEY_SHIFT	VM_HIGH_ARCH_BIT_0
 # define VM_PKEY_BIT0	VM_HIGH_ARCH_0	/* A protection key is a 4-bit value */
 # define VM_PKEY_BIT1	VM_HIGH_ARCH_1	/* on x86 and 5-bit value on ppc64   */
@@ -341,6 +341,15 @@ extern unsigned int kobjsize(const void *objp);
 #endif
 #endif /* CONFIG_ARCH_HAS_PKEYS */
 
+#if defined(CONFIG_ARM64)
+# define VM_PKEY_SHIFT	VM_HIGH_ARCH_BIT_2
+# define VM_PKEY_BIT0	VM_HIGH_ARCH_2	/* A protection key is a 3-bit value on arm64 */
+# define VM_PKEY_BIT1	VM_HIGH_ARCH_3
+# define VM_PKEY_BIT2	VM_HIGH_ARCH_4
+# define VM_PKEY_BIT3	0
+# define VM_PKEY_BIT4	0
+#endif
+
 #ifdef CONFIG_X86_USER_SHADOW_STACK
 /*
  * VM_SHADOW_STACK should not be set with VM_SHARED because of lack of
-- 
2.25.1