1 // SPDX-License-Identifier: GPL-2.0 2 3 #include <linux/export.h> 4 #include <linux/mm.h> 5 #include <asm/pgtable.h> 6 7 pgprot_t vm_get_page_prot(unsigned long vm_flags) 8 { 9 unsigned long val = pgprot_val(protection_map[vm_flags & 10 (VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)]); 11 12 #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS 13 /* 14 * Take the 4 protection key bits out of the vma->vm_flags value and 15 * turn them in to the bits that we can put in to a pte. 16 * 17 * Only override these if Protection Keys are available (which is only 18 * on 64-bit). 19 */ 20 if (vm_flags & VM_PKEY_BIT0) 21 val |= _PAGE_PKEY_BIT0; 22 if (vm_flags & VM_PKEY_BIT1) 23 val |= _PAGE_PKEY_BIT1; 24 if (vm_flags & VM_PKEY_BIT2) 25 val |= _PAGE_PKEY_BIT2; 26 if (vm_flags & VM_PKEY_BIT3) 27 val |= _PAGE_PKEY_BIT3; 28 #endif 29 30 val = __sme_set(val); 31 if (val & _PAGE_PRESENT) 32 val &= __supported_pte_mask; 33 return __pgprot(val); 34 } 35 EXPORT_SYMBOL(vm_get_page_prot); 36