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| 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 |
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