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arm64: convert protection key into vm_flags and pgprot values

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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>
This commit is contained in:
Joey Gouly 2024-08-22 16:10:57 +01:00 committed by Will Deacon
parent b66db4f3cc
commit b3c03fe137
2 changed files with 20 additions and 1 deletions
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10
arch/arm64/include/asm/mman.h
View File

@ -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)

11
arch/arm64/mm/mmap.c
View File

@ -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);