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// SPDX-License-Identifier: GPL-2.0-only /* * Implementation of the memory encryption/decryption API. * * Since the low-level details of the operation depend on the * Confidential Computing environment (e.g. pKVM, CCA, ...), this just * acts as a top-level dispatcher to whatever hooks may have been * registered. * * Author: Will Deacon <will@kernel.org> * Copyright (C) 2024 Google LLC * * "Hello, boils and ghouls!" */ #include <linux/bug.h> #include <linux/compiler.h> #include <linux/err.h> #include <linux/mm.h> #include <asm/mem_encrypt.h> static const struct arm64_mem_crypt_ops *crypt_ops; int arm64_mem_crypt_ops_register(const struct arm64_mem_crypt_ops *ops) { if (WARN_ON(crypt_ops)) return -EBUSY; crypt_ops = ops; return 0; } int set_memory_encrypted(unsigned long addr, int numpages) { if (likely(!crypt_ops) || WARN_ON(!PAGE_ALIGNED(addr))) return 0; return crypt_ops->encrypt(addr, numpages); } EXPORT_SYMBOL_GPL(set_memory_encrypted); int set_memory_decrypted(unsigned long addr, int numpages) { if (likely(!crypt_ops) || WARN_ON(!PAGE_ALIGNED(addr))) return 0; return crypt_ops->decrypt(addr, numpages); } EXPORT_SYMBOL_GPL(set_memory_decrypted);