From patchwork Mon Feb 20 18:38:27 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Roth X-Patchwork-Id: 13146930 X-Patchwork-Delegate: herbert@gondor.apana.org.au Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BDEF4C27C7C for ; Mon, 20 Feb 2023 18:55:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232783AbjBTSz0 (ORCPT ); Mon, 20 Feb 2023 13:55:26 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39762 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232781AbjBTSzS (ORCPT ); Mon, 20 Feb 2023 13:55:18 -0500 Received: from NAM10-MW2-obe.outbound.protection.outlook.com (mail-mw2nam10on2086.outbound.protection.outlook.com [40.107.94.86]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 150C21A958; Mon, 20 Feb 2023 10:54:53 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=Gmt6ZUhs/YZgwYwcMlaO0KGTIL8lIymTI/4kjByjZhd4yLJpnHCa3NeRx3RH/IqMEui9z/5db75YPQsHg6wdhsWZ/Ro1Vq8rd5HSF5Sqma2AXEn2PZwHZUg0KUD2jlB7qoIDCgFwlei03vUMi1CALnjHmL5+D5yPZqeFNokjThie06mBU4k2QicIcPhmweEh5AjTDDHSLjLSCIbx/qGghl9J5QYVepDlv7dCISo7hk5cnJkvChP4hgbCFT2Pycpupkv9s1jPPobXrMH1cZWxlpHr52Zw4yge7a5xgvebX5JKwYQ3pVfFEsQNZ90ZhBv6OeErPcEwhdSOXYmJ7Sf19Q== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=fQ5XEYYKQSPDy3XEDppFDt/H106z3yOc84xd6pNrjdc=; b=NhEd+7XSPpuz850oMnk+BPUzgvkkRDSqUfAOSNVsJQNPiXpYVyt5hIoOVup7Mm/sX1m5n2zCMsFPKYeezrLathbLxaBPZVXoJq3xgYynuOWniXYmlrkLsvHJabjfyCGjgPL4bn9fbKYeXCsDTUVOrEmmbvTYQDBtO3Ww0V7dX6MMsgxTkyV66IChgLeefxMfvcFMldJy8a+q2/SLAH8dvXU2PJ4gzXkzyq7TqCWkaLkmBTRJlHEnna14N76YPOIJiCL3/lmRZ1/W+N4MupVTS4jfbCyaBrdBuNOseWnIa4bE1I+Qg16c1QcIEK4ON7QhxXxb7cdqT8TMHY1xCij4dA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 165.204.84.17) smtp.rcpttodomain=vger.kernel.org smtp.mailfrom=amd.com; dmarc=pass (p=quarantine sp=quarantine pct=100) action=none header.from=amd.com; dkim=none (message not signed); arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amd.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=fQ5XEYYKQSPDy3XEDppFDt/H106z3yOc84xd6pNrjdc=; b=S0Ap34RODGLjJ53/WOs1ZLXWcni2RUMULQA5c3QIdgAlvs/xYOpF865IJipCGYonvDEqm/NAutazqhyhcgNfVXPfFKALViCW4xICsSXl+NnTpQ7NHlhtx/veXHA2yAueuq9orDXKDLHIF/1OCHKmSlOcU2uYPIDHkY1hmkPkcUg= Received: from DS7PR05CA0041.namprd05.prod.outlook.com (2603:10b6:8:2f::8) by MW4PR12MB7335.namprd12.prod.outlook.com (2603:10b6:303:22b::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6111.19; Mon, 20 Feb 2023 18:53:41 +0000 Received: from DM6NAM11FT034.eop-nam11.prod.protection.outlook.com (2603:10b6:8:2f:cafe::2f) by DS7PR05CA0041.outlook.office365.com (2603:10b6:8:2f::8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6134.16 via Frontend Transport; Mon, 20 Feb 2023 18:53:41 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; 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 DM6NAM11FT034.mail.protection.outlook.com (10.13.173.47) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.6111.19 via Frontend Transport; Mon, 20 Feb 2023 18:53:41 +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; Mon, 20 Feb 2023 12:53:40 -0600 From: Michael Roth To: CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Brijesh Singh , "Harald Hoyer" Subject: [PATCH RFC v8 36/56] KVM: SVM: Add KVM_SEV_SNP_LAUNCH_FINISH command Date: Mon, 20 Feb 2023 12:38:27 -0600 Message-ID: <20230220183847.59159-37-michael.roth@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230220183847.59159-1-michael.roth@amd.com> References: <20230220183847.59159-1-michael.roth@amd.com> MIME-Version: 1.0 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: DM6NAM11FT034:EE_|MW4PR12MB7335:EE_ X-MS-Office365-Filtering-Correlation-Id: 8871b370-24dd-47a4-576d-08db1373c8c6 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230025)(4636009)(39860400002)(396003)(346002)(376002)(136003)(451199018)(40470700004)(46966006)(36840700001)(44832011)(36860700001)(2906002)(86362001)(82740400003)(81166007)(40460700003)(336012)(26005)(47076005)(16526019)(478600001)(186003)(426003)(82310400005)(36756003)(40480700001)(356005)(70586007)(83380400001)(70206006)(1076003)(8936002)(54906003)(2616005)(6916009)(4326008)(41300700001)(6666004)(8676002)(7416002)(5660300002)(316002)(7406005)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Feb 2023 18:53:41.2884 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 8871b370-24dd-47a4-576d-08db1373c8c6 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: DM6NAM11FT034.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR12MB7335 Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org From: Brijesh Singh The KVM_SEV_SNP_LAUNCH_FINISH finalize the cryptographic digest and stores it as the measurement of the guest at launch. While finalizing the launch flow, it also issues the LAUNCH_UPDATE command to encrypt the VMSA pages. If its an SNP guest, then VMSA was added in the RMP entry as a guest owned page and also removed from the kernel direct map so flush it later after it is transitioned back to hypervisor state and restored in the direct map. Signed-off-by: Brijesh Singh Signed-off-by: Harald Hoyer Signed-off-by: Ashish Kalra Signed-off-by: Michael Roth --- .../virt/kvm/x86/amd-memory-encryption.rst | 23 ++++ arch/x86/kvm/svm/sev.c | 122 ++++++++++++++++++ include/uapi/linux/kvm.h | 14 ++ 3 files changed, 159 insertions(+) diff --git a/Documentation/virt/kvm/x86/amd-memory-encryption.rst b/Documentation/virt/kvm/x86/amd-memory-encryption.rst index c94be8e6d657..dafb0c9984f1 100644 --- a/Documentation/virt/kvm/x86/amd-memory-encryption.rst +++ b/Documentation/virt/kvm/x86/amd-memory-encryption.rst @@ -513,6 +513,29 @@ Returns: 0 on success, -negative on error See the SEV-SNP spec for further details on how to build the VMPL permission mask and page type. +21. KVM_SNP_LAUNCH_FINISH +------------------------- + +After completion of the SNP guest launch flow, the KVM_SNP_LAUNCH_FINISH command can be +issued to make the guest ready for the execution. + +Parameters (in): struct kvm_sev_snp_launch_finish + +Returns: 0 on success, -negative on error + +:: + + struct kvm_sev_snp_launch_finish { + __u64 id_block_uaddr; + __u64 id_auth_uaddr; + __u8 id_block_en; + __u8 auth_key_en; + __u8 host_data[32]; + __u8 pad[6]; + }; + + +See SEV-SNP specification for further details on launch finish input parameters. References ========== diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index 03dd227f6090..515e22d0dc30 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -2280,6 +2280,109 @@ static int snp_launch_update(struct kvm *kvm, struct kvm_sev_cmd *argp) snp_launch_update_gfn_handler, argp); } +static int snp_launch_update_vmsa(struct kvm *kvm, struct kvm_sev_cmd *argp) +{ + struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; + struct sev_data_snp_launch_update data = {}; + struct kvm_vcpu *vcpu; + unsigned long i; + int ret; + + data.gctx_paddr = __psp_pa(sev->snp_context); + data.page_type = SNP_PAGE_TYPE_VMSA; + + kvm_for_each_vcpu(i, vcpu, kvm) { + struct vcpu_svm *svm = to_svm(vcpu); + u64 pfn = __pa(svm->sev_es.vmsa) >> PAGE_SHIFT; + + /* Perform some pre-encryption checks against the VMSA */ + ret = sev_es_sync_vmsa(svm); + if (ret) + return ret; + + /* Transition the VMSA page to a firmware state. */ + ret = rmp_make_private(pfn, -1, PG_LEVEL_4K, sev->asid, true); + if (ret) + return ret; + + /* Issue the SNP command to encrypt the VMSA */ + data.address = __sme_pa(svm->sev_es.vmsa); + ret = __sev_issue_cmd(argp->sev_fd, SEV_CMD_SNP_LAUNCH_UPDATE, + &data, &argp->error); + if (ret) { + snp_page_reclaim(pfn); + return ret; + } + + svm->vcpu.arch.guest_state_protected = true; + } + + return 0; +} + +static int snp_launch_finish(struct kvm *kvm, struct kvm_sev_cmd *argp) +{ + struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; + struct kvm_sev_snp_launch_finish params; + struct sev_data_snp_launch_finish *data; + void *id_block = NULL, *id_auth = NULL; + int ret; + + if (!sev_snp_guest(kvm)) + return -ENOTTY; + + if (!sev->snp_context) + return -EINVAL; + + if (copy_from_user(¶ms, (void __user *)(uintptr_t)argp->data, sizeof(params))) + return -EFAULT; + + /* Measure all vCPUs using LAUNCH_UPDATE before finalizing the launch flow. */ + ret = snp_launch_update_vmsa(kvm, argp); + if (ret) + return ret; + + data = kzalloc(sizeof(*data), GFP_KERNEL_ACCOUNT); + if (!data) + return -ENOMEM; + + if (params.id_block_en) { + id_block = psp_copy_user_blob(params.id_block_uaddr, KVM_SEV_SNP_ID_BLOCK_SIZE); + if (IS_ERR(id_block)) { + ret = PTR_ERR(id_block); + goto e_free; + } + + data->id_block_en = 1; + data->id_block_paddr = __sme_pa(id_block); + + id_auth = psp_copy_user_blob(params.id_auth_uaddr, KVM_SEV_SNP_ID_AUTH_SIZE); + if (IS_ERR(id_auth)) { + ret = PTR_ERR(id_auth); + goto e_free_id_block; + } + + data->id_auth_paddr = __sme_pa(id_auth); + + if (params.auth_key_en) + data->auth_key_en = 1; + } + + memcpy(data->host_data, params.host_data, KVM_SEV_SNP_FINISH_DATA_SIZE); + data->gctx_paddr = __psp_pa(sev->snp_context); + ret = sev_issue_cmd(kvm, SEV_CMD_SNP_LAUNCH_FINISH, data, &argp->error); + + kfree(id_auth); + +e_free_id_block: + kfree(id_block); + +e_free: + kfree(data); + + return ret; +} + int sev_mem_enc_ioctl(struct kvm *kvm, void __user *argp) { struct kvm_sev_cmd sev_cmd; @@ -2376,6 +2479,9 @@ int sev_mem_enc_ioctl(struct kvm *kvm, void __user *argp) case KVM_SEV_SNP_LAUNCH_UPDATE: r = snp_launch_update(kvm, &sev_cmd); break; + case KVM_SEV_SNP_LAUNCH_FINISH: + r = snp_launch_finish(kvm, &sev_cmd); + break; default: r = -EINVAL; goto out; @@ -2831,11 +2937,27 @@ void sev_free_vcpu(struct kvm_vcpu *vcpu) svm = to_svm(vcpu); + /* + * If its an SNP guest, then VMSA was added in the RMP entry as + * a guest owned page. Transition the page to hypervisor state + * before releasing it back to the system. + * Also the page is removed from the kernel direct map, so flush it + * later after it is transitioned back to hypervisor state and + * restored in the direct map. + */ + if (sev_snp_guest(vcpu->kvm)) { + u64 pfn = __pa(svm->sev_es.vmsa) >> PAGE_SHIFT; + + if (host_rmp_make_shared(pfn, PG_LEVEL_4K, true)) + goto skip_vmsa_free; + } + if (vcpu->arch.guest_state_protected) sev_flush_encrypted_page(vcpu, svm->sev_es.vmsa); __free_page(virt_to_page(svm->sev_es.vmsa)); +skip_vmsa_free: if (svm->sev_es.ghcb_sa_free) kvfree(svm->sev_es.ghcb_sa); } diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index 4098bba17aa4..2bab08a5b5d7 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -1921,6 +1921,7 @@ enum sev_cmd_id { KVM_SEV_SNP_INIT, KVM_SEV_SNP_LAUNCH_START, KVM_SEV_SNP_LAUNCH_UPDATE, + KVM_SEV_SNP_LAUNCH_FINISH, KVM_SEV_NR_MAX, }; @@ -2055,6 +2056,19 @@ struct kvm_sev_snp_launch_update { __u8 vmpl1_perms; }; +#define KVM_SEV_SNP_ID_BLOCK_SIZE 96 +#define KVM_SEV_SNP_ID_AUTH_SIZE 4096 +#define KVM_SEV_SNP_FINISH_DATA_SIZE 32 + +struct kvm_sev_snp_launch_finish { + __u64 id_block_uaddr; + __u64 id_auth_uaddr; + __u8 id_block_en; + __u8 auth_key_en; + __u8 host_data[KVM_SEV_SNP_FINISH_DATA_SIZE]; + __u8 pad[6]; +}; + #define KVM_DEV_ASSIGN_ENABLE_IOMMU (1 << 0) #define KVM_DEV_ASSIGN_PCI_2_3 (1 << 1) #define KVM_DEV_ASSIGN_MASK_INTX (1 << 2)