From patchwork Wed Apr 24 16:10:03 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Brijesh Singh X-Patchwork-Id: 10915105 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id E595A922 for ; Wed, 24 Apr 2019 16:10:48 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D669328A6E for ; Wed, 24 Apr 2019 16:10:48 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id CA5D028A60; Wed, 24 Apr 2019 16:10:48 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2BCBA28B00 for ; Wed, 24 Apr 2019 16:10:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732219AbfDXQKL (ORCPT ); Wed, 24 Apr 2019 12:10:11 -0400 Received: from mail-eopbgr780077.outbound.protection.outlook.com ([40.107.78.77]:3916 "EHLO NAM03-BY2-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1732190AbfDXQKH (ORCPT ); Wed, 24 Apr 2019 12:10:07 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amdcloud.onmicrosoft.com; s=selector1-amd-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=dt04xiqmlGp1YsYqoGTONzn4VfXThk4QE7ccUMPFe8s=; b=eR12Hfnw1rvARls3qFebobNa44lIk3YznCyWtEuzXtJOPRbYwFxYBWbC8Xad+xhfr52mIdq+kCAAI3/XiMBsNXu8XWl5E8cdCyW2HVBfnRlGJvKJu6mKnj0KeEozvrcr5dX1vlRJkFGXBmYMZOZmTQuzdV5w3e4VP7xeReyp7N8= Received: from DM6PR12MB2682.namprd12.prod.outlook.com (20.176.116.31) by DM6PR12MB2907.namprd12.prod.outlook.com (20.179.71.213) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.1835.12; Wed, 24 Apr 2019 16:10:04 +0000 Received: from DM6PR12MB2682.namprd12.prod.outlook.com ([fe80::9183:846f:a93e:9a43]) by DM6PR12MB2682.namprd12.prod.outlook.com ([fe80::9183:846f:a93e:9a43%5]) with mapi id 15.20.1813.017; Wed, 24 Apr 2019 16:10:04 +0000 From: "Singh, Brijesh" To: "kvm@vger.kernel.org" CC: "qemu-devel@nongnu.org" , "Singh, Brijesh" , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Paolo Bonzini , =?utf-8?b?UmFkaW0gS3LEjW3DocWZ?= , Joerg Roedel , Borislav Petkov , "Lendacky, Thomas" , "x86@kernel.org" , "linux-kernel@vger.kernel.org" Subject: [RFC PATCH v1 04/10] KVM: SVM: Add support for KVM_SEV_RECEIVE_START command Thread-Topic: [RFC PATCH v1 04/10] KVM: SVM: Add support for KVM_SEV_RECEIVE_START command Thread-Index: AQHU+rgtPINgrzeHlEmNAR52bb0//w== Date: Wed, 24 Apr 2019 16:10:03 +0000 Message-ID: <20190424160942.13567-5-brijesh.singh@amd.com> References: <20190424160942.13567-1-brijesh.singh@amd.com> In-Reply-To: <20190424160942.13567-1-brijesh.singh@amd.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: SN4PR0601CA0019.namprd06.prod.outlook.com (2603:10b6:803:2f::29) To DM6PR12MB2682.namprd12.prod.outlook.com (2603:10b6:5:4a::31) authentication-results: spf=none (sender IP is ) smtp.mailfrom=brijesh.singh@amd.com; x-ms-exchange-messagesentrepresentingtype: 1 x-mailer: git-send-email 2.17.1 x-originating-ip: [165.204.77.1] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 660ccdb4-dd77-461b-bd12-08d6c8cf4f72 x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(5600141)(711020)(4605104)(4618075)(2017052603328)(7193020);SRVR:DM6PR12MB2907; x-ms-traffictypediagnostic: DM6PR12MB2907: x-microsoft-antispam-prvs: x-forefront-prvs: 00179089FD x-forefront-antispam-report: SFV:NSPM;SFS:(10009020)(39860400002)(136003)(366004)(396003)(376002)(346002)(189003)(199004)(1730700003)(99286004)(2501003)(73956011)(478600001)(11346002)(6506007)(76176011)(14454004)(6116002)(52116002)(386003)(476003)(25786009)(66946007)(486006)(4326008)(71200400001)(66446008)(66556008)(3846002)(66476007)(64756008)(1076003)(66574012)(71190400001)(446003)(186003)(2616005)(5660300002)(2351001)(102836004)(97736004)(26005)(14444005)(86362001)(6512007)(8676002)(66066001)(8936002)(68736007)(2906002)(50226002)(256004)(81156014)(305945005)(36756003)(316002)(6436002)(54906003)(7736002)(5640700003)(81166006)(53936002)(6916009)(6486002)(7416002);DIR:OUT;SFP:1101;SCL:1;SRVR:DM6PR12MB2907;H:DM6PR12MB2682.namprd12.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;MX:1;A:1; received-spf: None (protection.outlook.com: amd.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: 9o8uv5pHmmeSWQSGDjVpDPrNG970EFQ6eSHD38oNKA9kelFU6tLpK1Cu6r7r3rIE1vTDgrgCBGO09MrVYlb7X1zbeS7pHncb5OTOz08803ATG9QBb1RT1cvu+GKJo6algPK4BX+trtgDxgwdkZoW4t6Tqf9sag/z3A8izBqQg4poGT3cmcfe07Nuu4+isYOMUuT3XYZpYegEocnSZS4DdcTQTgp0Hb55tiVtiAXZ1uKpXYq2dtggYxj+7yxHuqQ1MZvk+yPYXnIfC83odl+bUVtviaR5O3x8UwKnXDavwHQGPcq6BxdVYAiLsCasZp+mNl+YrNfdHEi2JMTM/2cbQUXGeuqAwAXudremzEj8FY7BaiPBISAPCVMjtmdxWq4zJGeRPTA5aeZV4a7QQNu8mVnMsLrwyJXl0aQX8wks+fY= Content-ID: <16FC0C507B7DFD4AA54FD9B66F0E83B8@namprd12.prod.outlook.com> MIME-Version: 1.0 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: 660ccdb4-dd77-461b-bd12-08d6c8cf4f72 X-MS-Exchange-CrossTenant-originalarrivaltime: 24 Apr 2019 16:10:04.1102 (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-Transport-CrossTenantHeadersStamped: DM6PR12MB2907 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The command is used to create encryption context for the incoming SEV guest. The encryption context can be later unused by the hypervisor to import the incoming data into the SEV guest memory space. Cc: Thomas Gleixner Cc: Ingo Molnar Cc: "H. Peter Anvin" Cc: Paolo Bonzini Cc: "Radim Krčmář" Cc: Joerg Roedel Cc: Borislav Petkov Cc: Tom Lendacky Cc: x86@kernel.org Cc: kvm@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Brijesh Singh --- .../virtual/kvm/amd-memory-encryption.rst | 29 +++++++ arch/x86/kvm/svm.c | 80 +++++++++++++++++++ include/uapi/linux/kvm.h | 9 +++ 3 files changed, 118 insertions(+) diff --git a/Documentation/virtual/kvm/amd-memory-encryption.rst b/Documentation/virtual/kvm/amd-memory-encryption.rst index 006832256ae3..acdff2454649 100644 --- a/Documentation/virtual/kvm/amd-memory-encryption.rst +++ b/Documentation/virtual/kvm/amd-memory-encryption.rst @@ -293,6 +293,35 @@ issued by the hypervisor to delete the encryption context. Returns: 0 on success, -negative on error +13. KVM_SEV_RECEIVE_START +------------------------ + +The KVM_SEV_RECEIVE_START command is used for creating the memory encryption +context for an incoming SEV guest. To create the encryption context, user must +provide a guest policy, the platform public Diffie-Hellman (PDH) key and session +information. + +Parameters: struct kvm_sev_receive_start (in/out) + +Returns: 0 on success, -negative on error + +:: + + struct kvm_sev_receive_start { + __u32 handle; /* if zero then firmware creates a new handle */ + __u32 policy; /* guest's policy */ + + __u64 pdh_uaddr; /* userspace address pointing to the PDH key */ + __u32 dh_len; + + __u64 session_addr; /* userspace address which points to the guest session information */ + __u32 session_len; + }; + +On success, the 'handle' field contains a new handle and on error, a negative value. + +For more details, see SEV spec Section 6.12. + References ========== diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 263f3c7deae7..a7dcf19baefb 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -7192,6 +7192,83 @@ static int sev_send_finish(struct kvm *kvm, struct kvm_sev_cmd *argp) return ret; } +static int sev_receive_start(struct kvm *kvm, struct kvm_sev_cmd *argp) +{ + struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; + struct sev_data_receive_start *start; + struct kvm_sev_receive_start params; + int *error = &argp->error; + void *session_data = NULL; + void *pdh_data = NULL; + int ret; + + if (!sev_guest(kvm)) + return -ENOTTY; + + /* Get parameter from the user */ + if (copy_from_user(¶ms, (void __user *)(uintptr_t)argp->data, + sizeof(struct kvm_sev_receive_start))) + return -EFAULT; + + if (!params.pdh_uaddr || !params.pdh_len || + !params.session_uaddr || !params.session_len) + return -EINVAL; + + start = kzalloc(sizeof(*start), GFP_KERNEL); + if (!start) + return -ENOMEM; + + start->handle = params.handle; + start->policy = params.policy; + + pdh_data = psp_copy_user_blob(params.pdh_uaddr, params.pdh_len); + if (IS_ERR(pdh_data)) { + ret = PTR_ERR(pdh_data); + goto e_free; + } + + start->pdh_cert_address = __psp_pa(pdh_data); + start->pdh_cert_len = params.pdh_len; + + session_data = psp_copy_user_blob(params.session_uaddr, params.session_len); + if (IS_ERR(session_data)) { + ret = PTR_ERR(session_data); + goto e_free_pdh; + } + + start->session_address = __psp_pa(session_data); + start->session_len = params.session_len; + + /* create memory encryption context */ + ret = __sev_issue_cmd(argp->sev_fd, SEV_CMD_RECEIVE_START, start, error); + if (ret) + goto e_free_session; + + /* Bind ASID to this guest */ + ret = sev_bind_asid(kvm, start->handle, error); + if (ret) + goto e_free_session; + + params.handle = start->handle; + if (copy_to_user((void __user *)(uintptr_t)argp->data, + ¶ms, sizeof(struct kvm_sev_receive_start))) { + ret = -EFAULT; + sev_unbind_asid(kvm, start->handle); + goto e_free_session; + } + + sev->handle = start->handle; + sev->fd = argp->sev_fd; + +e_free_session: + kfree(session_data); +e_free_pdh: + kfree(pdh_data); +e_free: + kfree(start); + return ret; +} + static int svm_mem_enc_op(struct kvm *kvm, void __user *argp) { struct kvm_sev_cmd sev_cmd; @@ -7242,6 +7319,9 @@ static int svm_mem_enc_op(struct kvm *kvm, void __user *argp) case KVM_SEV_SEND_FINISH: r = sev_send_finish(kvm, &sev_cmd); break; + case KVM_SEV_RECEIVE_START: + r = sev_receive_start(kvm, &sev_cmd); + break; default: r = -EINVAL; goto out; diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index 0bee91bba329..fee75bf1fd90 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -1541,6 +1541,15 @@ struct kvm_sev_send_update_data { __u32 trans_len; }; +struct kvm_sev_receive_start { + __u32 handle; + __u32 policy; + __u64 pdh_uaddr; + __u32 pdh_len; + __u64 session_uaddr; + __u32 session_len; +}; + #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)