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 pgtable_list; 15 struct list_head gmap_list; 16 unsigned long gmap_asce; 17 unsigned long asce; 18 unsigned long asce_limit; 19 unsigned long vdso_base; 20 /* The mmu context belongs to a secure guest. */ 21 atomic_t protected_count; 22 /* 23 * The following bitfields need a down_write on the mm 24 * semaphore when they are written to. As they are only 25 * written once, they can be read without a lock. 26 * 27 * The mmu context allocates 4K page tables. 28 */ 29 unsigned int alloc_pgste:1; 30 /* The mmu context uses extended page tables. */ 31 unsigned int has_pgste:1; 32 /* The mmu context uses storage keys. */ 33 unsigned int uses_skeys:1; 34 /* The mmu context uses CMM. */ 35 unsigned int uses_cmm:1; 36 /* 37 * The mmu context allows COW-sharing of memory pages (KSM, zeropage). 38 * Note that COW-sharing during fork() is currently always allowed. 39 */ 40 unsigned int allow_cow_sharing:1; 41 /* The gmaps associated with this context are allowed to use huge pages. */ 42 unsigned int allow_gmap_hpage_1m:1; 43 } mm_context_t; 44 45 #define INIT_MM_CONTEXT(name) \ 46 .context.lock = __SPIN_LOCK_UNLOCKED(name.context.lock), \ 47 .context.pgtable_list = LIST_HEAD_INIT(name.context.pgtable_list), \ 48 .context.gmap_list = LIST_HEAD_INIT(name.context.gmap_list), 49 50 #endif 51