| 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); |
|---|
| 21 | |
|---|
