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- /* 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 */
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