arch/x86/mm/kmsan_shadow.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * x86-specific bits of KMSAN shadow implementation.
   4  *
   5  * Copyright (C) 2022 Google LLC
   6  * Author: Alexander Potapenko <glider@google.com>
   7  */
   8
   9 #include <asm/cpu_entry_area.h>
  10 #include <linux/percpu-defs.h>
  11
  12 /*
  13  * Addresses within the CPU entry area (including e.g. exception stacks) do not
  14  * have struct page entries corresponding to them, so they need separate
  15  * handling.
  16  * arch_kmsan_get_meta_or_null() (declared in the header) maps the addresses in
  17  * CPU entry area to addresses in cpu_entry_area_shadow/cpu_entry_area_origin.
  18  */
  19 DEFINE_PER_CPU(char[CPU_ENTRY_AREA_SIZE], cpu_entry_area_shadow);
  20 DEFINE_PER_CPU(char[CPU_ENTRY_AREA_SIZE], cpu_entry_area_origin);