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| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
|---|---|
| 2 | /* |
| 3 | * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
| 4 | */ |
| 5 | |
| 6 | #ifndef __UM_TLBFLUSH_H |
| 7 | #define __UM_TLBFLUSH_H |
| 8 | |
| 9 | #include <linux/mm.h> |
| 10 | |
| 11 | /* |
| 12 | * In UML, we need to sync the TLB over by using mmap/munmap syscalls from |
| 13 | * the process handling the MM (which can be the kernel itself). |
| 14 | * |
| 15 | * To track updates, we can hook into set_ptes and flush_tlb_*. With set_ptes |
| 16 | * we catch all PTE transitions where memory that was unusable becomes usable. |
| 17 | * While with flush_tlb_* we can track any memory that becomes unusable and |
| 18 | * even if a higher layer of the page table was modified. |
| 19 | * |
| 20 | * So, we simply track updates using both methods and mark the memory area to |
| 21 | * be synced later on. The only special case is that flush_tlb_kern_* needs to |
| 22 | * be executed immediately as there is no good synchronization point in that |
| 23 | * case. In contrast, in the set_ptes case we can wait for the next kernel |
| 24 | * segfault before we do the synchornization. |
| 25 | * |
| 26 | * - flush_tlb_all() flushes all processes TLBs |
| 27 | * - flush_tlb_mm(mm) flushes the specified mm context TLB's |
| 28 | * - flush_tlb_page(vma, vmaddr) flushes one page |
| 29 | * - flush_tlb_range(vma, start, end) flushes a range of pages |
| 30 | * - flush_tlb_kernel_range(start, end) flushes a range of kernel pages |
| 31 | */ |
| 32 | |
| 33 | extern int um_tlb_sync(struct mm_struct *mm); |
| 34 | |
| 35 | extern void flush_tlb_all(void); |
| 36 | extern void flush_tlb_mm(struct mm_struct *mm); |
| 37 | |
| 38 | static inline void flush_tlb_page(struct vm_area_struct *vma, |
| 39 | unsigned long address) |
| 40 | { |
| 41 | um_tlb_mark_sync(vma->vm_mm, address, address + PAGE_SIZE); |
| 42 | } |
| 43 | |
| 44 | static inline void flush_tlb_range(struct vm_area_struct *vma, |
| 45 | unsigned long start, unsigned long end) |
| 46 | { |
| 47 | um_tlb_mark_sync(vma->vm_mm, start, end); |
| 48 | } |
| 49 | |
| 50 | static inline void flush_tlb_kernel_range(unsigned long start, |
| 51 | unsigned long end) |
| 52 | { |
| 53 | um_tlb_mark_sync(&init_mm, start, end); |
| 54 | |
| 55 | /* Kernel needs to be synced immediately */ |
| 56 | um_tlb_sync(&init_mm); |
| 57 | } |
| 58 | |
| 59 | #endif |
| 60 |
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