From: Joey Gouly <joey.gouly@arm.com>
Date: Thu, 22 Aug 2024 15:10:57 +0000 (+0100)
Subject: arm64: convert protection key into vm_flags and pgprot values
X-Git-Tag: v6.12-rc1~221^2~2^2~16
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=b3c03fe13766f0455c4c77817a2aa385ed89937d;p=thirdparty%2Flinux.git

arm64: convert protection key into vm_flags and pgprot values

Modify arch_calc_vm_prot_bits() and vm_get_page_prot() such that the pkey
value is set in the vm_flags and then into the pgprot value.

Signed-off-by: Joey Gouly <joey.gouly@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20240822151113.1479789-15-joey.gouly@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
---

diff --git a/arch/arm64/include/asm/mman.h b/arch/arm64/include/asm/mman.h
index 5966ee4a61542..52791715f6e69 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 +17,14 @@ static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot,
 	if (system_supports_mte() && (prot & PROT_MTE))
 		ret |= VM_MTE;
 
+#ifdef CONFIG_ARCH_HAS_PKEYS
+	if (system_supports_poe()) {
+		ret |= pkey & BIT(0) ? VM_PKEY_BIT0 : 0;
+		ret |= pkey & BIT(1) ? VM_PKEY_BIT1 : 0;
+		ret |= pkey & BIT(2) ? VM_PKEY_BIT2 : 0;
+	}
+#endif
+
 	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 642bdf908b22f..7e3ad97e27d80 100644
--- a/arch/arm64/mm/mmap.c
+++ b/arch/arm64/mm/mmap.c
@@ -102,6 +102,17 @@ pgprot_t vm_get_page_prot(unsigned long vm_flags)
 	if (vm_flags & VM_MTE)
 		prot |= PTE_ATTRINDX(MT_NORMAL_TAGGED);
 
+#ifdef CONFIG_ARCH_HAS_PKEYS
+	if (system_supports_poe()) {
+		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;
+	}
+#endif
+
 	return __pgprot(prot);
 }
 EXPORT_SYMBOL(vm_get_page_prot);