1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_X86_MMU_H 3 #define _ASM_X86_MMU_H 4 5 #include <linux/spinlock.h> 6 #include <linux/rwsem.h> 7 #include <linux/mutex.h> 8 #include <linux/atomic.h> 9 #include <linux/bits.h> 10 11 /* Uprobes on this MM assume 32-bit code */ 12 #define MM_CONTEXT_UPROBE_IA32 0 13 /* vsyscall page is accessible on this MM */ 14 #define MM_CONTEXT_HAS_VSYSCALL 1 15 /* Do not allow changing LAM mode */ 16 #define MM_CONTEXT_LOCK_LAM 2 17 /* Allow LAM and SVA coexisting */ 18 #define MM_CONTEXT_FORCE_TAGGED_SVA 3 19 20 /* 21 * x86 has arch-specific MMU state beyond what lives in mm_struct. 22 */ 23 typedef struct { 24 /* 25 * ctx_id uniquely identifies this mm_struct. A ctx_id will never 26 * be reused, and zero is not a valid ctx_id. 27 */ 28 u64 ctx_id; 29 30 /* 31 * Any code that needs to do any sort of TLB flushing for this 32 * mm will first make its changes to the page tables, then 33 * increment tlb_gen, then flush. This lets the low-level 34 * flushing code keep track of what needs flushing. 35 * 36 * This is not used on Xen PV. 37 */ 38 atomic64_t tlb_gen; 39 40 #ifdef CONFIG_MODIFY_LDT_SYSCALL 41 struct rw_semaphore ldt_usr_sem; 42 struct ldt_struct *ldt; 43 #endif 44 45 #ifdef CONFIG_X86_64 46 unsigned long flags; 47 #endif 48 49 #ifdef CONFIG_ADDRESS_MASKING 50 /* Active LAM mode: X86_CR3_LAM_U48 or X86_CR3_LAM_U57 or 0 (disabled) */ 51 unsigned long lam_cr3_mask; 52 53 /* Significant bits of the virtual address. Excludes tag bits. */ 54 u64 untag_mask; 55 #endif 56 57 struct mutex lock; 58 void __user *vdso; /* vdso base address */ 59 const struct vdso_image *vdso_image; /* vdso image in use */ 60 61 atomic_t perf_rdpmc_allowed; /* nonzero if rdpmc is allowed */ 62 #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS 63 /* 64 * One bit per protection key says whether userspace can 65 * use it or not. protected by mmap_lock. 66 */ 67 u16 pkey_allocation_map; 68 s16 execute_only_pkey; 69 #endif 70 } mm_context_t; 71 72 #define INIT_MM_CONTEXT(mm) \ 73 .context = { \ 74 .ctx_id = 1, \ 75 .lock = __MUTEX_INITIALIZER(mm.context.lock), \ 76 } 77 78 void leave_mm(void); 79 #define leave_mm leave_mm 80 81 #endif /* _ASM_X86_MMU_H */ 82