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 <rick.p.edgecombe@intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: <akpm@linux-foundation.org> Cc: <ard.biesheuvel@linaro.org> Cc: <deneen.t.dock@intel.com> Cc: <kernel-hardening@lists.openwall.com> Cc: <kristen@linux.intel.com> Cc: <linux_dti@icloud.com> Cc: <will.deacon@arm.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Nadav Amit <nadav.amit@gmail.com> Cc: Rik van Riel <riel@surriel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/20190426001143.4983-15-namit@vmware.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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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