mmu.h

 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
 9typedef 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