From patchwork Wed Apr 24 16:10:05 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Brijesh Singh X-Patchwork-Id: 10915107 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 BDA9613B5 for ; Wed, 24 Apr 2019 16:10:54 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id AD59E28AF1 for ; Wed, 24 Apr 2019 16:10:54 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id A0E0F28B8D; Wed, 24 Apr 2019 16:10:54 +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 E3E2C28B37 for ; Wed, 24 Apr 2019 16:10:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732382AbfDXQKs (ORCPT ); Wed, 24 Apr 2019 12:10:48 -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 S1732171AbfDXQKL (ORCPT ); Wed, 24 Apr 2019 12:10:11 -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=yJrMyjOweEJUu/E5ehbZk+M5UO0UDN7fzlRgSfjlSdw=; b=tOnH0QmlTQ5oZDR/A+g2l5MkepkMz3pom69YghGjvsliOS7REvP7FCvkuhrfWbq+bDt7Z/MkLOrTiTzwCwvpx2WjkrpNrcPQGQAQxC1NvYXID5HIcZYa5/FABE/kW9WFNcnFmP7OV6LyuohDrEEd88tz5bbrSQbaMhQ79ocDYak= 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 16:10:05 +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 16:10:05 +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 05/10] KVM: SVM: Add KVM_SEV_RECEIVE_UPDATE_DATA command Thread-Topic: [RFC PATCH v1 05/10] KVM: SVM: Add KVM_SEV_RECEIVE_UPDATE_DATA command Thread-Index: AQHU+rgt1JBGvmrqzE6fg6speZH5KQ== Date: Wed, 24 Apr 2019 16:10:05 +0000 Message-ID: <20190424160942.13567-6-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: 869cb85d-ea7a-4d2a-2555-08d6c8cf503c 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: Dge4eNiYna9RVu/1FLanWNAXZd1PdcECftoOS1DN5wUh8XpOWEZnwKntcsbNxX0diERdDhBGVjYvdS2KM8hODEdd5MbWdLwFWU6BLhHIrJGR+FyMdh5CXxpwmT8ELccN9G7gwqeIm7MZP44jWChoJXDu1lIWQQME8EmK6PEVCP39iQORE4RxDFN9RQxBGO66SRDA95i5930Hp4FHg+XSB0dbJq6qWjvE2S5bz7BHzj+68N3uq8Dxdy+9UW4oVf/0OV/DoOHV2M6OF2t02zathhJxlehcS1O0IzfU3ZV/kOCgTUIVOeGLxp44czgTxfEv9wXnk2XCPnnr7w1fISN0guhk6qOV5lQnO+IYkGoOlNQTZ0f3PPph6B0Mey4YjMRAeIPWrcZLGxJWiMWJFvJRhe9rTYuRoUJvgqPc+mYx6Y4= Content-ID: <9E9C901CA16DF34C901C217E2F8D17D3@namprd12.prod.outlook.com> MIME-Version: 1.0 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: 869cb85d-ea7a-4d2a-2555-08d6c8cf503c X-MS-Exchange-CrossTenant-originalarrivaltime: 24 Apr 2019 16:10:05.3621 (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 for copying the incoming buffer 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 | 24 ++++++ arch/x86/kvm/svm.c | 84 +++++++++++++++++++ include/uapi/linux/kvm.h | 9 ++ 3 files changed, 117 insertions(+) diff --git a/Documentation/virtual/kvm/amd-memory-encryption.rst b/Documentation/virtual/kvm/amd-memory-encryption.rst index acdff2454649..b9c3dc02f344 100644 --- a/Documentation/virtual/kvm/amd-memory-encryption.rst +++ b/Documentation/virtual/kvm/amd-memory-encryption.rst @@ -322,6 +322,30 @@ On success, the 'handle' field contains a new handle and on error, a negative va For more details, see SEV spec Section 6.12. +14. KVM_SEV_RECEIVE_UPDATE_DATA +---------------------------- + +The KVM_SEV_RECEIVE_UPDATE_DATA command can be used by the hypervisor to copy +the incoming buffers into the guest memory region with encryption context +created during the KVM_SEV_RECEIVE_START. + +Parameters (in): struct kvm_sev_receive_update_data + +Returns: 0 on success, -negative on error + +:: + + struct kvm_sev_launch_receive_update_data { + __u64 hdr_uaddr; /* userspace address containing the packet header */ + __u32 hdr_len; + + __u64 guest_uaddr; /* the destination guest memory region */ + __u32 guest_len; + + __u64 trans_uaddr; /* the incoming buffer memory region */ + __u32 trans_len; + }; + References ========== diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index a7dcf19baefb..c81cac09c5af 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -7269,6 +7269,87 @@ static int sev_receive_start(struct kvm *kvm, struct kvm_sev_cmd *argp) return ret; } +static int sev_receive_update_data(struct kvm *kvm, struct kvm_sev_cmd *argp) +{ + struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; + struct kvm_sev_receive_update_data params; + struct sev_data_receive_update_data *data; + void *hdr = NULL, *trans = NULL; + struct page **guest_page; + unsigned long n; + int ret, offset; + + if (!sev_guest(kvm)) + return -EINVAL; + + if (copy_from_user(¶ms, (void __user *)(uintptr_t)argp->data, + sizeof(struct kvm_sev_receive_update_data))) + return -EFAULT; + + if (!params.hdr_uaddr || !params.hdr_len || + !params.guest_uaddr || !params.guest_len || + !params.trans_uaddr || !params.trans_len) + return -EINVAL; + + /* Check if we are crossing the page boundry */ + offset = params.guest_uaddr & (PAGE_SIZE - 1); + if ((params.guest_len + offset > PAGE_SIZE)) + return -EINVAL; + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + hdr = psp_copy_user_blob(params.hdr_uaddr, params.hdr_len); + if (IS_ERR(hdr)) { + ret = PTR_ERR(hdr); + goto e_free; + } + + data->hdr_address = __psp_pa(hdr); + data->hdr_len = params.hdr_len; + + trans = psp_copy_user_blob(params.trans_uaddr, params.trans_len); + if (IS_ERR(trans)) { + ret = PTR_ERR(trans); + goto e_free; + } + + data->trans_address = __psp_pa(trans); + data->trans_len = params.trans_len; + + /* Pin guest memory */ + ret = -EFAULT; + guest_page = sev_pin_memory(kvm, params.guest_uaddr & PAGE_MASK, + PAGE_SIZE, &n, 0); + if (!guest_page) + goto e_free; + + data->guest_address = __sme_page_pa(guest_page[0]) + offset; + data->guest_len = params.guest_len; + + /* + * The RECEIVE_UPDATE_DATA command requires C-bit to be always set. + * The __sme_page_pa() takes care of setting the C-bit only when SME + * is enabled on the host. But we need to set the C-bit regarless of + * the SME state. + */ + data->guest_address |= me_mask; + + /* flush the caches to ensure that DRAM has recent contents */ + sev_clflush_pages(guest_page, n); + + data->handle = sev->handle; + ret = sev_issue_cmd(kvm, SEV_CMD_RECEIVE_UPDATE_DATA, data, &argp->error); + + sev_unpin_memory(kvm, guest_page, n); +e_free: + kfree(data); + kfree(hdr); + kfree(trans); + return ret; +} + static int svm_mem_enc_op(struct kvm *kvm, void __user *argp) { struct kvm_sev_cmd sev_cmd; @@ -7322,6 +7403,9 @@ static int svm_mem_enc_op(struct kvm *kvm, void __user *argp) case KVM_SEV_RECEIVE_START: r = sev_receive_start(kvm, &sev_cmd); break; + case KVM_SEV_RECEIVE_UPDATE_DATA: + r = sev_receive_update_data(kvm, &sev_cmd); + break; default: r = -EINVAL; goto out; diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index fee75bf1fd90..07e058a3ec11 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -1550,6 +1550,15 @@ struct kvm_sev_receive_start { __u32 session_len; }; +struct kvm_sev_receive_update_data { + __u64 hdr_uaddr; + __u32 hdr_len; + __u64 guest_uaddr; + __u32 guest_len; + __u64 trans_uaddr; + __u32 trans_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)