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Tue, 27 Jul 2021 22:26:59 +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 , Thomas Gleixner , Ingo Molnar , Dave Hansen , Andy Lutomirski , Peter Zijlstra Subject: [PATCH 02/11] x86/sev: Add an x86 version of prot_guest_has() Date: Tue, 27 Jul 2021 17:26:05 -0500 Message-Id: X-Mailer: git-send-email 2.32.0 In-Reply-To: References: X-ClientProxiedBy: SA9PR03CA0027.namprd03.prod.outlook.com (2603:10b6:806:20::32) 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 SA9PR03CA0027.namprd03.prod.outlook.com (2603:10b6:806:20::32) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4373.18 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: 9aba2817-c7a1-4d37-85cf-08d9514da650 X-MS-Exchange-CrossTenant-AuthSource: DM4PR12MB5229.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Jul 2021 22:26:59.5984 (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: vjNjgKJHyJ+bu48aW6JzyGZJoNqbbs7iH1NNjXVAYABtQMOEmpXyMrS/5hzZ2DrBrba410jUbAC5Z0nKavXbfw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM8PR12MB5416 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Introduce an x86 version of the prot_guest_has() function. This will be used in the more generic x86 code to replace vendor specific calls like sev_active(), etc. While the name suggests this is intended mainly for guests, it will also be used for host memory encryption checks in place of sme_active(). The amd_prot_guest_has() function does not use EXPORT_SYMBOL_GPL for the same reasons previously stated when changing sme_active(), sev_active and sme_me_mask to EXPORT_SYBMOL: commit 87df26175e67 ("x86/mm: Unbreak modules that rely on external PAGE_KERNEL availability") commit 9d5f38ba6c82 ("x86/mm: Unbreak modules that use the DMA API") Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Cc: Andy Lutomirski Cc: Peter Zijlstra 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/x86/Kconfig | 1 + arch/x86/include/asm/mem_encrypt.h | 2 ++ arch/x86/include/asm/protected_guest.h | 27 ++++++++++++++++++++++++++ arch/x86/mm/mem_encrypt.c | 25 ++++++++++++++++++++++++ include/linux/protected_guest.h | 5 +++++ 5 files changed, 60 insertions(+) create mode 100644 arch/x86/include/asm/protected_guest.h diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 49270655e827..e47213cbfc55 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1514,6 +1514,7 @@ config AMD_MEM_ENCRYPT select ARCH_HAS_FORCE_DMA_UNENCRYPTED select INSTRUCTION_DECODER select ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS + select ARCH_HAS_PROTECTED_GUEST help Say yes to enable support for the encryption of system memory. This requires an AMD processor that supports Secure Memory diff --git a/arch/x86/include/asm/mem_encrypt.h b/arch/x86/include/asm/mem_encrypt.h index 9c80c68d75b5..a46d47662772 100644 --- a/arch/x86/include/asm/mem_encrypt.h +++ b/arch/x86/include/asm/mem_encrypt.h @@ -53,6 +53,7 @@ void __init sev_es_init_vc_handling(void); bool sme_active(void); bool sev_active(void); bool sev_es_active(void); +bool amd_prot_guest_has(unsigned int attr); #define __bss_decrypted __section(".bss..decrypted") @@ -78,6 +79,7 @@ static inline void sev_es_init_vc_handling(void) { } static inline bool sme_active(void) { return false; } static inline bool sev_active(void) { return false; } static inline bool sev_es_active(void) { return false; } +static inline bool amd_prot_guest_has(unsigned int attr) { return false; } static inline int __init early_set_memory_decrypted(unsigned long vaddr, unsigned long size) { return 0; } diff --git a/arch/x86/include/asm/protected_guest.h b/arch/x86/include/asm/protected_guest.h new file mode 100644 index 000000000000..b4a267dddf93 --- /dev/null +++ b/arch/x86/include/asm/protected_guest.h @@ -0,0 +1,27 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Protected Guest (and Host) Capability checks + * + * Copyright (C) 2021 Advanced Micro Devices, Inc. + * + * Author: Tom Lendacky + */ + +#ifndef _X86_PROTECTED_GUEST_H +#define _X86_PROTECTED_GUEST_H + +#include + +#ifndef __ASSEMBLY__ + +static inline bool prot_guest_has(unsigned int attr) +{ + if (sme_me_mask) + return amd_prot_guest_has(attr); + + return false; +} + +#endif /* __ASSEMBLY__ */ + +#endif /* _X86_PROTECTED_GUEST_H */ diff --git a/arch/x86/mm/mem_encrypt.c b/arch/x86/mm/mem_encrypt.c index ff08dc463634..7d3b2c6f5f88 100644 --- a/arch/x86/mm/mem_encrypt.c +++ b/arch/x86/mm/mem_encrypt.c @@ -20,6 +20,7 @@ #include #include #include +#include #include #include @@ -389,6 +390,30 @@ bool noinstr sev_es_active(void) return sev_status & MSR_AMD64_SEV_ES_ENABLED; } +bool amd_prot_guest_has(unsigned int attr) +{ + switch (attr) { + case PATTR_MEM_ENCRYPT: + return sme_me_mask != 0; + + case PATTR_SME: + case PATTR_HOST_MEM_ENCRYPT: + return sme_active(); + + case PATTR_SEV: + case PATTR_GUEST_MEM_ENCRYPT: + return sev_active(); + + case PATTR_SEV_ES: + case PATTR_GUEST_PROT_STATE: + return sev_es_active(); + + default: + return false; + } +} +EXPORT_SYMBOL(amd_prot_guest_has); + /* Override for DMA direct allocation check - ARCH_HAS_FORCE_DMA_UNENCRYPTED */ bool force_dma_unencrypted(struct device *dev) { diff --git a/include/linux/protected_guest.h b/include/linux/protected_guest.h index f8ed7b72967b..7a7120abbb62 100644 --- a/include/linux/protected_guest.h +++ b/include/linux/protected_guest.h @@ -17,6 +17,11 @@ #define PATTR_GUEST_MEM_ENCRYPT 2 /* Guest encrypted memory */ #define PATTR_GUEST_PROT_STATE 3 /* Guest encrypted state */ +/* 0x800 - 0x8ff reserved for AMD */ +#define PATTR_SME 0x800 +#define PATTR_SEV 0x801 +#define PATTR_SEV_ES 0x802 + #ifdef CONFIG_ARCH_HAS_PROTECTED_GUEST #include