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