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Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by CO1NAM11FT107.mail.protection.outlook.com (10.13.175.97) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.5924.11 via Frontend Transport; Wed, 14 Dec 2022 20:04:56 +0000 Received: from localhost (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.34; Wed, 14 Dec 2022 14:04:55 -0600 From: Michael Roth To: CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH RFC v7 56/64] KVM: x86/mmu: Generate KVM_EXIT_MEMORY_FAULT for implicit conversions for SNP Date: Wed, 14 Dec 2022 13:40:48 -0600 Message-ID: <20221214194056.161492-57-michael.roth@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221214194056.161492-1-michael.roth@amd.com> References: <20221214194056.161492-1-michael.roth@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1NAM11FT107:EE_|PH7PR12MB5904:EE_ X-MS-Office365-Filtering-Correlation-Id: c4a67f0b-5239-46a7-ec86-08dade0e793a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Dec 2022 20:04:56.9284 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c4a67f0b-5239-46a7-ec86-08dade0e793a X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT107.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB5904 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org SEV-SNP will set PFERR_GUEST_ENC_MASK for NPT faults for encrypted/private memory. Generally such accesses will be preceded at some point by a GHCB request to the hypervisor to put the page in the expected private/shared state, so the KVM MMU wouldn't normally need to generate KVM_EXIT_MEMORY_FAULTs to handle the updates at access time. However, implicit conversions are also supported for SNP guests, and in those cases an KVM_EXIT_MEMORY_FAULT will be needed to put the page in the expected private/shared state. Check for this PFERR_GUEST_ENC_MASK bit when determining whether a #NPF should be handled with restrictedmem pages or not. Signed-off-by: Michael Roth --- arch/x86/kvm/svm/sev.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index 885a3f1da910..0dd3d9debe48 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -4446,7 +4446,10 @@ int sev_fault_is_private(struct kvm *kvm, gpa_t gpa, u64 error_code, bool *priva * source is the only indicator of whether the fault should be treated * as private or not. */ - *private_fault = kvm_mem_is_private(kvm, gfn); + if (sev_snp_guest(kvm)) + *private_fault = (error_code & PFERR_GUEST_ENC_MASK) ? true : false; + else + *private_fault = kvm_mem_is_private(kvm, gfn); return 1; -- 2.25.1