1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __MMU_H
3 #define __MMU_H
4
5 #include <linux/cpumask.h>
6 #include <linux/errno.h>
7 #include <asm/asm-extable.h>
8
9 typedef struct {
10 spinlock_t lock;
11 cpumask_t cpu_attach_mask;
12 atomic_t flush_count;
13 unsigned int flush_mm;
14 struct list_head gmap_list;
15 unsigned long gmap_asce;
16 unsigned long asce;
17 unsigned long asce_limit;
18 unsigned long vdso_base;
19 /* The mmu context belongs to a secure guest. */
20 atomic_t protected_count;
21 /*
22 * The following bitfields need a down_write on the mm
23 * semaphore when they are written to. As they are only
24 * written once, they can be read without a lock.
25 *
26 * The mmu context allocates 4K page tables.
27 */
28 unsigned int alloc_pgste:1;
29 /* The mmu context uses extended page tables. */
30 unsigned int has_pgste:1;
31 /* The mmu context uses storage keys. */
32 unsigned int uses_skeys:1;
33 /* The mmu context uses CMM. */
34 unsigned int uses_cmm:1;
35 /*
36 * The mmu context allows COW-sharing of memory pages (KSM, zeropage).
37 * Note that COW-sharing during fork() is currently always allowed.
38 */
39 unsigned int allow_cow_sharing:1;
40 /* The gmaps associated with this context are allowed to use huge pages. */
41 unsigned int allow_gmap_hpage_1m:1;
42 } mm_context_t;
43
44 #define INIT_MM_CONTEXT(name) \
45 .context.lock = __SPIN_LOCK_UNLOCKED(name.context.lock), \
46 .context.gmap_list = LIST_HEAD_INIT(name.context.gmap_list),
47
48 #endif
49
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