linux-stable/include/linux/mem_encrypt.h
Thiago Jung Bauermann ae7eb82a92 fs/core/vmcore: Move sev_active() reference to x86 arch code
Secure Encrypted Virtualization is an x86-specific feature, so it shouldn't
appear in generic kernel code because it forces non-x86 architectures to
define the sev_active() function, which doesn't make a lot of sense.

To solve this problem, add an x86 elfcorehdr_read() function to override
the generic weak implementation. To do that, it's necessary to make
read_from_oldmem() public so that it can be used outside of vmcore.c.

Also, remove the export for sev_active() since it's only used in files that
won't be built as modules.

Signed-off-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Lianbo Jiang <lijiang@redhat.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190806044919.10622-6-bauerman@linux.ibm.com
2019-08-09 22:52:10 +10:00

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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* AMD Memory Encryption Support
*
* Copyright (C) 2016 Advanced Micro Devices, Inc.
*
* Author: Tom Lendacky <thomas.lendacky@amd.com>
*/
#ifndef __MEM_ENCRYPT_H__
#define __MEM_ENCRYPT_H__
#ifndef __ASSEMBLY__
#ifdef CONFIG_ARCH_HAS_MEM_ENCRYPT
#include <asm/mem_encrypt.h>
#else /* !CONFIG_ARCH_HAS_MEM_ENCRYPT */
static inline bool mem_encrypt_active(void) { return false; }
#endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */
#ifdef CONFIG_AMD_MEM_ENCRYPT
/*
* The __sme_set() and __sme_clr() macros are useful for adding or removing
* the encryption mask from a value (e.g. when dealing with pagetable
* entries).
*/
#define __sme_set(x) ((x) | sme_me_mask)
#define __sme_clr(x) ((x) & ~sme_me_mask)
#else
#define __sme_set(x) (x)
#define __sme_clr(x) (x)
#endif
#endif /* __ASSEMBLY__ */
#endif /* __MEM_ENCRYPT_H__ */