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 uses extended page tables. */
27 	unsigned int has_pgste:1;
28 	/* The mmu context uses storage keys. */
29 	unsigned int uses_skeys:1;
30 	/* The mmu context uses CMM. */
31 	unsigned int uses_cmm:1;
32 	/*
33 	 * The mmu context allows COW-sharing of memory pages (KSM, zeropage).
34 	 * Note that COW-sharing during fork() is currently always allowed.
35 	 */
36 	unsigned int allow_cow_sharing:1;
37 	/* The gmaps associated with this context are allowed to use huge pages. */
38 	unsigned int allow_gmap_hpage_1m:1;
39 } mm_context_t;
40 
41 #define INIT_MM_CONTEXT(name)						   \
42 	.context.lock =	__SPIN_LOCK_UNLOCKED(name.context.lock),	   \
43 	.context.gmap_list = LIST_HEAD_INIT(name.context.gmap_list),
44 
45 #endif
46