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cc_platform.h
/* SPDX-License-Identifier: GPL-2.0-only */ /* * Confidential Computing Platform Capability checks * * Copyright (C) 2021 Advanced Micro Devices, Inc. * * Author: Tom Lendacky <thomas.lendacky@amd.com> */ #ifndef _LINUX_CC_PLATFORM_H #define _LINUX_CC_PLATFORM_H #include <linux/types.h> #include <linux/stddef.h> /** * enum cc_attr - Confidential computing attributes * * These attributes represent confidential computing features that are * currently active. */ enum cc_attr { /** * @CC_ATTR_MEM_ENCRYPT: Memory encryption is active * * The platform/OS is running with active memory encryption. This * includes running either as a bare-metal system or a hypervisor * and actively using memory encryption or as a guest/virtual machine * and actively using memory encryption. * * Examples include SME, SEV and SEV-ES. */ CC_ATTR_MEM_ENCRYPT, /** * @CC_ATTR_HOST_MEM_ENCRYPT: Host memory encryption is active * * The platform/OS is running as a bare-metal system or a hypervisor * and actively using memory encryption. * * Examples include SME. */ CC_ATTR_HOST_MEM_ENCRYPT, /** * @CC_ATTR_GUEST_MEM_ENCRYPT: Guest memory encryption is active * * The platform/OS is running as a guest/virtual machine and actively * using memory encryption. * * Examples include SEV and SEV-ES. */ CC_ATTR_GUEST_MEM_ENCRYPT, /** * @CC_ATTR_GUEST_STATE_ENCRYPT: Guest state encryption is active * * The platform/OS is running as a guest/virtual machine and actively * using memory encryption and register state encryption. * * Examples include SEV-ES. */ CC_ATTR_GUEST_STATE_ENCRYPT, }; #ifdef CONFIG_ARCH_HAS_CC_PLATFORM /** * cc_platform_has() - Checks if the specified cc_attr attribute is active * @attr: Confidential computing attribute to check * * The cc_platform_has() function will return an indicator as to whether the * specified Confidential Computing attribute is currently active. * * Context: Any context * Return: * * TRUE - Specified Confidential Computing attribute is active * * FALSE - Specified Confidential Computing attribute is not active */ bool cc_platform_has(enum cc_attr attr); #else /* !CONFIG_ARCH_HAS_CC_PLATFORM */ static inline bool cc_platform_has(enum cc_attr attr) { return false; } #endif /* CONFIG_ARCH_HAS_CC_PLATFORM */ #endif /* _LINUX_CC_PLATFORM_H */