forked from mirrors/linux
d8aa7eea78
Provide support for Secure Encrypted Virtualization (SEV). This initial support defines a flag that is used by the kernel to determine if it is running with SEV active. Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Signed-off-by: Brijesh Singh <brijesh.singh@amd.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Borislav Petkov <bp@suse.de> Tested-by: Borislav Petkov <bp@suse.de> Cc: kvm@vger.kernel.org Cc: Borislav Petkov <bp@alien8.de> Cc: Andy Lutomirski <luto@kernel.org> Link: https://lkml.kernel.org/r/20171020143059.3291-3-brijesh.singh@amd.com
56 lines
1.2 KiB
C
56 lines
1.2 KiB
C
/*
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* AMD Memory Encryption Support
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*
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* Copyright (C) 2016 Advanced Micro Devices, Inc.
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*
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* Author: Tom Lendacky <thomas.lendacky@amd.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __MEM_ENCRYPT_H__
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#define __MEM_ENCRYPT_H__
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#ifndef __ASSEMBLY__
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#ifdef CONFIG_ARCH_HAS_MEM_ENCRYPT
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#include <asm/mem_encrypt.h>
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#else /* !CONFIG_ARCH_HAS_MEM_ENCRYPT */
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#define sme_me_mask 0ULL
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static inline bool sme_active(void) { return false; }
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static inline bool sev_active(void) { return false; }
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#endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */
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static inline bool mem_encrypt_active(void)
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{
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return sme_me_mask;
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}
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static inline u64 sme_get_me_mask(void)
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{
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return sme_me_mask;
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}
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#ifdef CONFIG_AMD_MEM_ENCRYPT
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/*
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* The __sme_set() and __sme_clr() macros are useful for adding or removing
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* the encryption mask from a value (e.g. when dealing with pagetable
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* entries).
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*/
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#define __sme_set(x) ((x) | sme_me_mask)
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#define __sme_clr(x) ((x) & ~sme_me_mask)
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#else
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#define __sme_set(x) (x)
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#define __sme_clr(x) (x)
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#endif
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#endif /* __ASSEMBLY__ */
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#endif /* __MEM_ENCRYPT_H__ */
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