Cregit: Linux 6.12: mmu.h

Contributors: 11
Author	Tokens	Token Proportion	Commits	Commit Proportion
Martin Schwidefsky	48	43.24%	11	39.29%
Linus Torvalds (pre-git)	16	14.41%	2	7.14%
Janosch Frank	11	9.91%	4	14.29%
Heiko Carstens	10	9.01%	2	7.14%
Claudio Imbrenda	9	8.11%	3	10.71%
David Hildenbrand	7	6.31%	1	3.57%
Dominik Dingel	6	5.41%	1	3.57%
Greg Kroah-Hartman	1	0.90%	1	3.57%
Christian Bornträger	1	0.90%	1	3.57%
Alexander Gordeev	1	0.90%	1	3.57%
Gerald Schaefer	1	0.90%	1	3.57%
Total	111		28

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __MMU_H
#define __MMU_H

#include <linux/cpumask.h>
#include <linux/errno.h>
#include <asm/asm-extable.h>

typedef struct {
	spinlock_t lock;
	cpumask_t cpu_attach_mask;
	atomic_t flush_count;
	unsigned int flush_mm;
	struct list_head gmap_list;
	unsigned long gmap_asce;
	unsigned long asce;
	unsigned long asce_limit;
	unsigned long vdso_base;
	/* The mmu context belongs to a secure guest. */
	atomic_t protected_count;
	/*
	 * The following bitfields need a down_write on the mm
	 * semaphore when they are written to. As they are only
	 * written once, they can be read without a lock.
	 *
	 * The mmu context allocates 4K page tables.
	 */
	unsigned int alloc_pgste:1;
	/* The mmu context uses extended page tables. */
	unsigned int has_pgste:1;
	/* The mmu context uses storage keys. */
	unsigned int uses_skeys:1;
	/* The mmu context uses CMM. */
	unsigned int uses_cmm:1;
	/*
	 * The mmu context allows COW-sharing of memory pages (KSM, zeropage).
	 * Note that COW-sharing during fork() is currently always allowed.
	 */
	unsigned int allow_cow_sharing:1;
	/* The gmaps associated with this context are allowed to use huge pages. */
	unsigned int allow_gmap_hpage_1m:1;
} mm_context_t;

#define INIT_MM_CONTEXT(name)						   \
	.context.lock =	__SPIN_LOCK_UNLOCKED(name.context.lock),	   \
	.context.gmap_list = LIST_HEAD_INIT(name.context.gmap_list),

#endif