cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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cc_platform.h (3140B)

      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 */
     22enum 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	 * @CC_ATTR_GUEST_UNROLL_STRING_IO: String I/O is implemented with
     67	 *                                  IN/OUT instructions
     68	 *
     69	 * The platform/OS is running as a guest/virtual machine and uses
     70	 * IN/OUT instructions in place of string I/O.
     71	 *
     72	 * Examples include TDX guest & SEV.
     73	 */
     74	CC_ATTR_GUEST_UNROLL_STRING_IO,
     75
     76	/**
     77	 * @CC_ATTR_SEV_SNP: Guest SNP is active.
     78	 *
     79	 * The platform/OS is running as a guest/virtual machine and actively
     80	 * using AMD SEV-SNP features.
     81	 */
     82	CC_ATTR_GUEST_SEV_SNP,
     83
     84	/**
     85	 * @CC_ATTR_HOTPLUG_DISABLED: Hotplug is not supported or disabled.
     86	 *
     87	 * The platform/OS is running as a guest/virtual machine does not
     88	 * support CPU hotplug feature.
     89	 *
     90	 * Examples include TDX Guest.
     91	 */
     92	CC_ATTR_HOTPLUG_DISABLED,
     93};
     94
     95#ifdef CONFIG_ARCH_HAS_CC_PLATFORM
     96
     97/**
     98 * cc_platform_has() - Checks if the specified cc_attr attribute is active
     99 * @attr: Confidential computing attribute to check
    100 *
    101 * The cc_platform_has() function will return an indicator as to whether the
    102 * specified Confidential Computing attribute is currently active.
    103 *
    104 * Context: Any context
    105 * Return:
    106 * * TRUE  - Specified Confidential Computing attribute is active
    107 * * FALSE - Specified Confidential Computing attribute is not active
    108 */
    109bool cc_platform_has(enum cc_attr attr);
    110
    111#else	/* !CONFIG_ARCH_HAS_CC_PLATFORM */
    112
    113static inline bool cc_platform_has(enum cc_attr attr) { return false; }
    114
    115#endif	/* CONFIG_ARCH_HAS_CC_PLATFORM */
    116
    117#endif	/* _LINUX_CC_PLATFORM_H */