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Tue, 27 Jul 2021 22:26:49 +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 Subject: [PATCH 01/11] mm: Introduce a function to check for virtualization protection features Date: Tue, 27 Jul 2021 17:26:04 -0500 Message-Id: X-Mailer: git-send-email 2.32.0 In-Reply-To: References: X-ClientProxiedBy: SN7PR04CA0187.namprd04.prod.outlook.com (2603:10b6:806:126::12) 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 SN7PR04CA0187.namprd04.prod.outlook.com (2603:10b6:806:126::12) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4352.26 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: 717f060a-ce09-4bfd-6ed3-08d9514da04b X-MS-Exchange-CrossTenant-AuthSource: DM4PR12MB5229.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Jul 2021 22:26:49.5535 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: ZAqqFm7MIdcu88eQAlOLDfwrloJneekLcMxN0JUEE1djlRNIG90oeAP9CYDEi2s/1Mvut8ee/ZKd0eCSw5uEow== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM8PR12MB5462 Precedence: bulk List-ID: X-Mailing-List: platform-driver-x86@vger.kernel.org In prep for other protected virtualization technologies, introduce a generic helper function, prot_guest_has(), that can be used to check for specific protection attributes, like memory encryption. This is intended to eliminate having to add multiple technology-specific checks to the code (e.g. if (sev_active() || tdx_active())). 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 Reviewed-by: Joerg Roedel --- arch/Kconfig | 3 +++ include/linux/protected_guest.h | 32 ++++++++++++++++++++++++++++++++ 2 files changed, 35 insertions(+) create mode 100644 include/linux/protected_guest.h diff --git a/arch/Kconfig b/arch/Kconfig index 129df498a8e1..a47cf283f2ff 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..f8ed7b72967b --- /dev/null +++ b/include/linux/protected_guest.h @@ -0,0 +1,32 @@ +/* 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__ + +#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 */