1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_X86_MMU_H
3#define _ASM_X86_MMU_H
4
5#include <linux/spinlock.h>
6#include <linux/rwsem.h>
7#include <linux/mutex.h>
8#include <linux/atomic.h>
9#include <linux/bits.h>
10
11/* Uprobes on this MM assume 32-bit code */
12#define MM_CONTEXT_UPROBE_IA32 0
13/* vsyscall page is accessible on this MM */
14#define MM_CONTEXT_HAS_VSYSCALL 1
15/* Do not allow changing LAM mode */
16#define MM_CONTEXT_LOCK_LAM 2
17/* Allow LAM and SVA coexisting */
18#define MM_CONTEXT_FORCE_TAGGED_SVA 3
19/* Tracks mm_cpumask */
20#define MM_CONTEXT_NOTRACK 4
21
22/*
23 * x86 has arch-specific MMU state beyond what lives in mm_struct.
24 */
25typedef struct {
26 /*
27 * ctx_id uniquely identifies this mm_struct. A ctx_id will never
28 * be reused, and zero is not a valid ctx_id.
29 */
30 u64 ctx_id;
31
32 /*
33 * Any code that needs to do any sort of TLB flushing for this
34 * mm will first make its changes to the page tables, then
35 * increment tlb_gen, then flush. This lets the low-level
36 * flushing code keep track of what needs flushing.
37 *
38 * This is not used on Xen PV.
39 */
40 atomic64_t tlb_gen;
41
42 unsigned long next_trim_cpumask;
43
44#ifdef CONFIG_MODIFY_LDT_SYSCALL
45 struct rw_semaphore ldt_usr_sem;
46 struct ldt_struct *ldt;
47#endif
48
49 unsigned long flags;
50
51#ifdef CONFIG_ADDRESS_MASKING
52 /* Active LAM mode: X86_CR3_LAM_U48 or X86_CR3_LAM_U57 or 0 (disabled) */
53 unsigned long lam_cr3_mask;
54
55 /* Significant bits of the virtual address. Excludes tag bits. */
56 u64 untag_mask;
57#endif
58
59 struct mutex lock;
60 void __user *vdso; /* vdso base address */
61 const struct vdso_image *vdso_image; /* vdso image in use */
62
63 atomic_t perf_rdpmc_allowed; /* nonzero if rdpmc is allowed */
64#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
65 /*
66 * One bit per protection key says whether userspace can
67 * use it or not. protected by mmap_lock.
68 */
69 u16 pkey_allocation_map;
70 s16 execute_only_pkey;
71#endif
72
73#ifdef CONFIG_BROADCAST_TLB_FLUSH
74 /*
75 * The global ASID will be a non-zero value when the process has
76 * the same ASID across all CPUs, allowing it to make use of
77 * hardware-assisted remote TLB invalidation like AMD INVLPGB.
78 */
79 u16 global_asid;
80
81 /* The process is transitioning to a new global ASID number. */
82 bool asid_transition;
83#endif
84} mm_context_t;
85
86#define INIT_MM_CONTEXT(mm) \
87 .context = { \
88 .ctx_id = 1, \
89 .lock = __MUTEX_INITIALIZER(mm.context.lock), \
90 }
91
92void leave_mm(void);
93#define leave_mm leave_mm
94
95#endif /* _ASM_X86_MMU_H */
96

source code of linux/arch/x86/include/asm/mmu.h