cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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pgprot.c (918B)

      1// SPDX-License-Identifier: GPL-2.0
      2
      3#include <linux/export.h>
      4#include <linux/mm.h>
      5#include <asm/pgtable.h>
      6
      7pgprot_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}
     35EXPORT_SYMBOL(vm_get_page_prot);