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Thu, 4 Mar 2021 22:40:22 +0000 From: Tom Lendacky To: linux-kernel@vger.kernel.org, x86@kernel.org Cc: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , Andy Lutomirski , Peter Zijlstra , Brijesh Singh Subject: [PATCH] x86/virtio: Have SEV guests enforce restricted virtio memory access Date: Thu, 4 Mar 2021 16:40:11 -0600 Message-Id: X-Mailer: git-send-email 2.30.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Originating-IP: [165.204.77.1] X-ClientProxiedBy: SN4PR0801CA0008.namprd08.prod.outlook.com (2603:10b6:803:29::18) To DM5PR12MB1355.namprd12.prod.outlook.com (2603:10b6:3:6e::7) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from tlendack-t1.amdoffice.net (165.204.77.1) by SN4PR0801CA0008.namprd08.prod.outlook.com (2603:10b6:803:29::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3890.20 via Frontend Transport; Thu, 4 Mar 2021 22:40:21 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: 2ed6698b-49b4-48b9-f073-08d8df5e7f0a X-MS-TrafficTypeDiagnostic: DM5PR12MB1868: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:9508; 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The VIRTIO_F_VERSION_1 and VIRTIO_F_ACCESS_PLATFORM features tell virtio to use the DMA API. Add arch_has_restricted_virtio_memory_access() for x86, to fail the device probe if these features have not been set for the device when running as an SEV guest. Cc: Brijesh Singh Signed-off-by: Tom Lendacky --- arch/x86/Kconfig | 1 + arch/x86/mm/mem_encrypt.c | 5 +++++ 2 files changed, 6 insertions(+) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 2792879d398e..e80e7268d2c6 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1518,6 +1518,7 @@ config AMD_MEM_ENCRYPT select ARCH_USE_MEMREMAP_PROT select ARCH_HAS_FORCE_DMA_UNENCRYPTED select INSTRUCTION_DECODER + select ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS 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/mm/mem_encrypt.c b/arch/x86/mm/mem_encrypt.c index 4b01f7dbaf30..667283f3dcfa 100644 --- a/arch/x86/mm/mem_encrypt.c +++ b/arch/x86/mm/mem_encrypt.c @@ -484,3 +484,8 @@ void __init mem_encrypt_init(void) print_mem_encrypt_feature_info(); } +int arch_has_restricted_virtio_memory_access(void) +{ + return sev_active(); +} +EXPORT_SYMBOL_GPL(arch_has_restricted_virtio_memory_access); -- 2.30.0