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63 lines
1.8 KiB
63 lines
1.8 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/export.h> |
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#include <linux/mm.h> |
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#include <asm/pgtable.h> |
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#include <asm/mem_encrypt.h> |
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static pgprot_t protection_map[16] __ro_after_init = { |
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[VM_NONE] = PAGE_NONE, |
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[VM_READ] = PAGE_READONLY, |
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[VM_WRITE] = PAGE_COPY, |
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[VM_WRITE | VM_READ] = PAGE_COPY, |
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[VM_EXEC] = PAGE_READONLY_EXEC, |
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[VM_EXEC | VM_READ] = PAGE_READONLY_EXEC, |
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[VM_EXEC | VM_WRITE] = PAGE_COPY_EXEC, |
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[VM_EXEC | VM_WRITE | VM_READ] = PAGE_COPY_EXEC, |
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[VM_SHARED] = PAGE_NONE, |
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[VM_SHARED | VM_READ] = PAGE_READONLY, |
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[VM_SHARED | VM_WRITE] = PAGE_SHARED, |
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[VM_SHARED | VM_WRITE | VM_READ] = PAGE_SHARED, |
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[VM_SHARED | VM_EXEC] = PAGE_READONLY_EXEC, |
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[VM_SHARED | VM_EXEC | VM_READ] = PAGE_READONLY_EXEC, |
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[VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_SHARED_EXEC, |
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[VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_SHARED_EXEC |
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}; |
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void add_encrypt_protection_map(void) |
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{ |
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unsigned int i; |
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for (i = 0; i < ARRAY_SIZE(protection_map); i++) |
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protection_map[i] = pgprot_encrypted(protection_map[i]); |
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} |
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pgprot_t vm_get_page_prot(unsigned long vm_flags) |
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{ |
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unsigned long val = pgprot_val(protection_map[vm_flags & |
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(VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)]); |
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#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS |
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/* |
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* Take the 4 protection key bits out of the vma->vm_flags value and |
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* turn them in to the bits that we can put in to a pte. |
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* |
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* Only override these if Protection Keys are available (which is only |
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* on 64-bit). |
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*/ |
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if (vm_flags & VM_PKEY_BIT0) |
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val |= _PAGE_PKEY_BIT0; |
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if (vm_flags & VM_PKEY_BIT1) |
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val |= _PAGE_PKEY_BIT1; |
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if (vm_flags & VM_PKEY_BIT2) |
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val |= _PAGE_PKEY_BIT2; |
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if (vm_flags & VM_PKEY_BIT3) |
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val |= _PAGE_PKEY_BIT3; |
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#endif |
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val = __sme_set(val); |
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if (val & _PAGE_PRESENT) |
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val &= __supported_pte_mask; |
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return __pgprot(val); |
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} |
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EXPORT_SYMBOL(vm_get_page_prot);
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