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Fri, 13 Aug 2021 17:00:04 +0000 From: Tom Lendacky To: linux-kernel@vger.kernel.org, x86@kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, iommu@lists.linux-foundation.org, kvm@vger.kernel.org, linux-efi@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-graphics-maintainer@vmware.com, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, kexec@lists.infradead.org, linux-fsdevel@vger.kernel.org Cc: Borislav Petkov , Brijesh Singh , Joerg Roedel , Andi Kleen , Sathyanarayanan Kuppuswamy , Tianyu Lan , Joerg Roedel Subject: [PATCH v2 02/12] mm: Introduce a function to check for virtualization protection features Date: Fri, 13 Aug 2021 11:59:21 -0500 Message-Id: <482fe51f1671c1cd081039801b03db7ec0036332.1628873970.git.thomas.lendacky@amd.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: References: Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: SN4PR0201CA0071.namprd02.prod.outlook.com (2603:10b6:803:20::33) To DM4PR12MB5229.namprd12.prod.outlook.com (2603:10b6:5:398::12) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from tlendack-t1.amd.com (165.204.77.1) by SN4PR0201CA0071.namprd02.prod.outlook.com (2603:10b6:803:20::33) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4415.14 via Frontend Transport; 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This is intended to eliminate having to add multiple technology-specific checks to the code (e.g. if (sev_active() || tdx_active())). Reviewed-by: Joerg Roedel Co-developed-by: Andi Kleen Signed-off-by: Andi Kleen Co-developed-by: Kuppuswamy Sathyanarayanan Signed-off-by: Kuppuswamy Sathyanarayanan Signed-off-by: Tom Lendacky --- arch/Kconfig | 3 +++ include/linux/protected_guest.h | 35 +++++++++++++++++++++++++++++++++ 2 files changed, 38 insertions(+) create mode 100644 include/linux/protected_guest.h diff --git a/arch/Kconfig b/arch/Kconfig index 98db63496bab..bd4f60c581f1 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -1231,6 +1231,9 @@ config RELR config ARCH_HAS_MEM_ENCRYPT bool +config ARCH_HAS_PROTECTED_GUEST + bool + config HAVE_SPARSE_SYSCALL_NR bool help diff --git a/include/linux/protected_guest.h b/include/linux/protected_guest.h new file mode 100644 index 000000000000..43d4dde94793 --- /dev/null +++ b/include/linux/protected_guest.h @@ -0,0 +1,35 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Protected Guest (and Host) Capability checks + * + * Copyright (C) 2021 Advanced Micro Devices, Inc. + * + * Author: Tom Lendacky + */ + +#ifndef _PROTECTED_GUEST_H +#define _PROTECTED_GUEST_H + +#ifndef __ASSEMBLY__ + +#include +#include + +#define PATTR_MEM_ENCRYPT 0 /* Encrypted memory */ +#define PATTR_HOST_MEM_ENCRYPT 1 /* Host encrypted memory */ +#define PATTR_GUEST_MEM_ENCRYPT 2 /* Guest encrypted memory */ +#define PATTR_GUEST_PROT_STATE 3 /* Guest encrypted state */ + +#ifdef CONFIG_ARCH_HAS_PROTECTED_GUEST + +#include + +#else /* !CONFIG_ARCH_HAS_PROTECTED_GUEST */ + +static inline bool prot_guest_has(unsigned int attr) { return false; } + +#endif /* CONFIG_ARCH_HAS_PROTECTED_GUEST */ + +#endif /* __ASSEMBLY__ */ + +#endif /* _PROTECTED_GUEST_H */ -- 2.32.0