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Rick Edgecombe
d253ca0c38
Add two new functions set_direct_map_default_noflush() and set_direct_map_invalid_noflush() for setting the direct map alias for the page to its default valid permissions and to an invalid state that cannot be cached in a TLB, respectively. These functions do not flush the TLB. Note, __kernel_map_pages() does something similar but flushes the TLB and doesn't reset the permission bits to default on all architectures. Also add an ARCH config ARCH_HAS_SET_DIRECT_MAP for specifying whether these have an actual implementation or a default empty one. Signed-off-by: Rick Edgecombe <[email protected]> Signed-off-by: Peter Zijlstra (Intel) <[email protected]> Cc: <[email protected]> Cc: <[email protected]> Cc: <[email protected]> Cc: <[email protected]> Cc: <[email protected]> Cc: <[email protected]> Cc: <[email protected]> Cc: Andy Lutomirski <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Dave Hansen <[email protected]> Cc: H. Peter Anvin <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Nadav Amit <[email protected]> Cc: Rik van Riel <[email protected]> Cc: Thomas Gleixner <[email protected]> Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]>
58 lines
1.4 KiB
C
58 lines
1.4 KiB
C
/*
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* Copyright 2017, Michael Ellerman, IBM Corporation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation;
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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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#endif
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#ifndef set_mce_nospec
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static inline int set_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 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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