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Mike Rapoport
6d47c23b16
On arm64, set_direct_map_*() functions may return 0 without actually changing the linear map. This behaviour can be controlled using kernel parameters, so we need a way to determine at runtime whether calls to set_direct_map_invalid_noflush() and set_direct_map_default_noflush() have any effect. Extend set_memory API with can_set_direct_map() function that allows checking if calling set_direct_map_*() will actually change the page table, replace several occurrences of open coded checks in arm64 with the new function and provide a generic stub for architectures that always modify page tables upon calls to set_direct_map APIs. [[email protected]: arm64: kfence: fix header inclusion ] Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Mike Rapoport <[email protected]> Reviewed-by: Catalin Marinas <[email protected]> Reviewed-by: David Hildenbrand <[email protected]> Acked-by: James Bottomley <[email protected]> Cc: Alexander Viro <[email protected]> Cc: Andy Lutomirski <[email protected]> Cc: Arnd Bergmann <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Christopher Lameter <[email protected]> Cc: Dan Williams <[email protected]> Cc: Dave Hansen <[email protected]> Cc: Elena Reshetova <[email protected]> Cc: Hagen Paul Pfeifer <[email protected]> Cc: "H. Peter Anvin" <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: James Bottomley <[email protected]> Cc: "Kirill A. Shutemov" <[email protected]> Cc: Mark Rutland <[email protected]> Cc: Matthew Wilcox <[email protected]> Cc: Michael Kerrisk <[email protected]> Cc: Palmer Dabbelt <[email protected]> Cc: Palmer Dabbelt <[email protected]> Cc: Paul Walmsley <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Rick Edgecombe <[email protected]> Cc: Roman Gushchin <[email protected]> Cc: Shakeel Butt <[email protected]> Cc: Shuah Khan <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Tycho Andersen <[email protected]> Cc: Will Deacon <[email protected]> Cc: kernel test robot <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
72 lines
1.7 KiB
C
72 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright 2017, Michael Ellerman, IBM Corporation.
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*/
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#ifndef _LINUX_SET_MEMORY_H_
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#define _LINUX_SET_MEMORY_H_
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#ifdef CONFIG_ARCH_HAS_SET_MEMORY
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#include <asm/set_memory.h>
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#else
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static inline int set_memory_ro(unsigned long addr, int numpages) { return 0; }
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static inline int set_memory_rw(unsigned long addr, int numpages) { return 0; }
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static inline int set_memory_x(unsigned long addr, int numpages) { return 0; }
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static inline int set_memory_nx(unsigned long addr, int numpages) { return 0; }
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#endif
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#ifndef CONFIG_ARCH_HAS_SET_DIRECT_MAP
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static inline int set_direct_map_invalid_noflush(struct page *page)
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{
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return 0;
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}
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static inline int set_direct_map_default_noflush(struct page *page)
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{
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return 0;
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}
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static inline bool kernel_page_present(struct page *page)
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{
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return true;
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}
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#else /* CONFIG_ARCH_HAS_SET_DIRECT_MAP */
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/*
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* Some architectures, e.g. ARM64 can disable direct map modifications at
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* boot time. Let them overrive this query.
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*/
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#ifndef can_set_direct_map
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static inline bool can_set_direct_map(void)
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{
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return true;
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}
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#define can_set_direct_map can_set_direct_map
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#endif
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#endif /* CONFIG_ARCH_HAS_SET_DIRECT_MAP */
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#ifndef set_mce_nospec
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static inline int set_mce_nospec(unsigned long pfn, bool unmap)
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{
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return 0;
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}
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#endif
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#ifndef clear_mce_nospec
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static inline int clear_mce_nospec(unsigned long pfn)
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{
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return 0;
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}
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#endif
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#ifndef CONFIG_ARCH_HAS_MEM_ENCRYPT
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static inline int set_memory_encrypted(unsigned long addr, int numpages)
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{
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return 0;
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}
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static inline int set_memory_decrypted(unsigned long addr, int numpages)
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{
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return 0;
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}
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#endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */
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#endif /* _LINUX_SET_MEMORY_H_ */
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