d94b827e89
This patch updates kernel hash page table entries to use storage key 3 for its mapping. This implies all kernel access will now use key 3 to control READ/WRITE. The patch also prevents the allocation of key 3 from userspace and UAMOR value is updated such that userspace cannot modify key 3. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Reviewed-by: Sandipan Das <sandipan@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201127044424.40686-9-aneesh.kumar@linux.ibm.com
45 lines
1.5 KiB
C
45 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_POWERPC_BOOK3S_64_HASH_PKEY_H
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#define _ASM_POWERPC_BOOK3S_64_HASH_PKEY_H
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/* We use key 3 for KERNEL */
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#define HASH_DEFAULT_KERNEL_KEY (HPTE_R_KEY_BIT0 | HPTE_R_KEY_BIT1)
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static inline u64 hash__vmflag_to_pte_pkey_bits(u64 vm_flags)
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{
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return (((vm_flags & VM_PKEY_BIT0) ? H_PTE_PKEY_BIT0 : 0x0UL) |
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((vm_flags & VM_PKEY_BIT1) ? H_PTE_PKEY_BIT1 : 0x0UL) |
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((vm_flags & VM_PKEY_BIT2) ? H_PTE_PKEY_BIT2 : 0x0UL) |
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((vm_flags & VM_PKEY_BIT3) ? H_PTE_PKEY_BIT3 : 0x0UL) |
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((vm_flags & VM_PKEY_BIT4) ? H_PTE_PKEY_BIT4 : 0x0UL));
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}
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static inline u64 pte_to_hpte_pkey_bits(u64 pteflags, unsigned long flags)
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{
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unsigned long pte_pkey;
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pte_pkey = (((pteflags & H_PTE_PKEY_BIT4) ? HPTE_R_KEY_BIT4 : 0x0UL) |
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((pteflags & H_PTE_PKEY_BIT3) ? HPTE_R_KEY_BIT3 : 0x0UL) |
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((pteflags & H_PTE_PKEY_BIT2) ? HPTE_R_KEY_BIT2 : 0x0UL) |
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((pteflags & H_PTE_PKEY_BIT1) ? HPTE_R_KEY_BIT1 : 0x0UL) |
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((pteflags & H_PTE_PKEY_BIT0) ? HPTE_R_KEY_BIT0 : 0x0UL));
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if (mmu_has_feature(MMU_FTR_BOOK3S_KUAP) ||
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mmu_has_feature(MMU_FTR_BOOK3S_KUEP)) {
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if ((pte_pkey == 0) && (flags & HPTE_USE_KERNEL_KEY))
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return HASH_DEFAULT_KERNEL_KEY;
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}
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return pte_pkey;
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}
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static inline u16 hash__pte_to_pkey_bits(u64 pteflags)
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{
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return (((pteflags & H_PTE_PKEY_BIT4) ? 0x10 : 0x0UL) |
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((pteflags & H_PTE_PKEY_BIT3) ? 0x8 : 0x0UL) |
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((pteflags & H_PTE_PKEY_BIT2) ? 0x4 : 0x0UL) |
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((pteflags & H_PTE_PKEY_BIT1) ? 0x2 : 0x0UL) |
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((pteflags & H_PTE_PKEY_BIT0) ? 0x1 : 0x0UL));
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}
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#endif
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