| Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| 2 | /* |
| 3 | * Confidential Computing Platform Capability checks |
| 4 | * |
| 5 | * Copyright (C) 2021 Advanced Micro Devices, Inc. |
| 6 | * |
| 7 | * Author: Tom Lendacky <thomas.lendacky@amd.com> |
| 8 | */ |
| 9 | |
| 10 | #ifndef _LINUX_CC_PLATFORM_H |
| 11 | #define _LINUX_CC_PLATFORM_H |
| 12 | |
| 13 | #include <linux/types.h> |
| 14 | #include <linux/stddef.h> |
| 15 | |
| 16 | /** |
| 17 | * enum cc_attr - Confidential computing attributes |
| 18 | * |
| 19 | * These attributes represent confidential computing features that are |
| 20 | * currently active. |
| 21 | */ |
| 22 | enum cc_attr { |
| 23 | /** |
| 24 | * @CC_ATTR_MEM_ENCRYPT: Memory encryption is active |
| 25 | * |
| 26 | * The platform/OS is running with active memory encryption. This |
| 27 | * includes running either as a bare-metal system or a hypervisor |
| 28 | * and actively using memory encryption or as a guest/virtual machine |
| 29 | * and actively using memory encryption. |
| 30 | * |
| 31 | * Examples include SME, SEV and SEV-ES. |
| 32 | */ |
| 33 | CC_ATTR_MEM_ENCRYPT, |
| 34 | |
| 35 | /** |
| 36 | * @CC_ATTR_HOST_MEM_ENCRYPT: Host memory encryption is active |
| 37 | * |
| 38 | * The platform/OS is running as a bare-metal system or a hypervisor |
| 39 | * and actively using memory encryption. |
| 40 | * |
| 41 | * Examples include SME. |
| 42 | */ |
| 43 | CC_ATTR_HOST_MEM_ENCRYPT, |
| 44 | |
| 45 | /** |
| 46 | * @CC_ATTR_GUEST_MEM_ENCRYPT: Guest memory encryption is active |
| 47 | * |
| 48 | * The platform/OS is running as a guest/virtual machine and actively |
| 49 | * using memory encryption. |
| 50 | * |
| 51 | * Examples include SEV and SEV-ES. |
| 52 | */ |
| 53 | CC_ATTR_GUEST_MEM_ENCRYPT, |
| 54 | |
| 55 | /** |
| 56 | * @CC_ATTR_GUEST_STATE_ENCRYPT: Guest state encryption is active |
| 57 | * |
| 58 | * The platform/OS is running as a guest/virtual machine and actively |
| 59 | * using memory encryption and register state encryption. |
| 60 | * |
| 61 | * Examples include SEV-ES. |
| 62 | */ |
| 63 | CC_ATTR_GUEST_STATE_ENCRYPT, |
| 64 | }; |
| 65 | |
| 66 | #ifdef CONFIG_ARCH_HAS_CC_PLATFORM |
| 67 | |
| 68 | /** |
| 69 | * cc_platform_has() - Checks if the specified cc_attr attribute is active |
| 70 | * @attr: Confidential computing attribute to check |
| 71 | * |
| 72 | * The cc_platform_has() function will return an indicator as to whether the |
| 73 | * specified Confidential Computing attribute is currently active. |
| 74 | * |
| 75 | * Context: Any context |
| 76 | * Return: |
| 77 | * * TRUE - Specified Confidential Computing attribute is active |
| 78 | * * FALSE - Specified Confidential Computing attribute is not active |
| 79 | */ |
| 80 | bool cc_platform_has(enum cc_attr attr); |
| 81 | |
| 82 | #else /* !CONFIG_ARCH_HAS_CC_PLATFORM */ |
| 83 | |
| 84 | static inline bool cc_platform_has(enum cc_attr attr) { return false; } |
| 85 | |
| 86 | #endif /* CONFIG_ARCH_HAS_CC_PLATFORM */ |
| 87 | |
| 88 | #endif /* _LINUX_CC_PLATFORM_H */ |