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Thu, 13 Feb 2020 01:15:47 +0000 From: Ashish Kalra To: pbonzini@redhat.com Cc: tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, rkrcmar@redhat.com, joro@8bytes.org, bp@suse.de, thomas.lendacky@amd.com, rientjes@google.com, x86@kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 02/12] KVM: SVM: Add KVM_SEND_UPDATE_DATA command Date: Thu, 13 Feb 2020 01:15:05 +0000 Message-Id: X-Mailer: git-send-email 2.17.1 In-Reply-To: References: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-ClientProxiedBy: DM6PR03CA0039.namprd03.prod.outlook.com (2603:10b6:5:100::16) To SN1PR12MB2528.namprd12.prod.outlook.com (2603:10b6:802:28::33) MIME-Version: 1.0 Received: from ashkalra_ubuntu_server.amd.com (165.204.77.1) by DM6PR03CA0039.namprd03.prod.outlook.com (2603:10b6:5:100::16) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2729.22 via Frontend Transport; Thu, 13 Feb 2020 01:15:46 +0000 X-Mailer: git-send-email 2.17.1 X-Originating-IP: [165.204.77.1] X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: 2ec9011f-ff9f-4feb-4dcb-08d7b0224187 X-MS-TrafficTypeDiagnostic: SN1PR12MB2366:|SN1PR12MB2366: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:7691; X-Forefront-PRVS: 031257FE13 X-Forefront-Antispam-Report: SFV:NSPM;SFS:(10009020)(4636009)(346002)(136003)(366004)(376002)(39860400002)(396003)(199004)(189003)(8936002)(5660300002)(66946007)(66476007)(66556008)(7416002)(2906002)(6916009)(6666004)(4326008)(7696005)(52116002)(316002)(36756003)(66574012)(6486002)(86362001)(956004)(2616005)(81156014)(478600001)(8676002)(81166006)(26005)(16526019)(186003);DIR:OUT;SFP:1101;SCL:1;SRVR:SN1PR12MB2366;H:SN1PR12MB2528.namprd12.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;A:1;MX:1; Received-SPF: None (protection.outlook.com: amd.com does not designate permitted sender hosts) X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: Fq8yNeViGMpGV8hjA/dTnwb8PXyFW5gKwRIWqQSBB7ys4NK65JdAbA0Gkn5P32O1tVtwt0bCSgTegG2u5qGqQ3nLN72aRkZTEl1O6hA0tTYmsDf+A37ovbEvRC0FUjBjQ3gvkvYr+/G8WZcErwL6kze9p7AFtloah/XejIApKsE37aZaqatlj5p6/60tDGtnHx3KOIz0nyB3QqpHmfe/bQ2+uFP/MHLMZTJr3Lbo5z6is6IxJKRdV/R5imnfzYmwTfGW62+NcnasI0Qy7sT8juvk8tUQctO5kQi7Ldgh/8jlKHA7/jUL/SIxGsUVYnV5yDqWEbEfIUyPVwqR+EcUraQSqkvqYSoG1I9y1NedNpoxscptgIywwjtR3SJSIDPQaOmL5yQfTlg2CjtRh4zK3dRN2pqtInkBP0JDnlSa/xgD/ndoPmfMEi06jwY4ayDP X-MS-Exchange-AntiSpam-MessageData: mTZq2hnyXJ14nKEkAIkxmSOI0LtimRckVZ0n1ctaQXnQ+/aOcuj9WZ24NYxqEQ8yyFXtLb4VaroHS+k2Ui1iAfInKgEzu/5qcgk0xacGRc/uuhs3eifPoUYT8ba363/tAgVbpU0qRIG407Ln2g44pA== X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: 2ec9011f-ff9f-4feb-4dcb-08d7b0224187 X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Feb 2020 01:15:47.5085 (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-CrossTenant-UserPrincipalName: Z57NhLaaI5a7Bs3qgRT9r+2nqnOiqs8T6fhUT1SeNKGKF1Y/0YHwSXkUr1hS6pDS/WdDWHnPvM/n0nuFzXGUvQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN1PR12MB2366 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Brijesh Singh The command is used for encrypting the guest memory region using the encryption context created with KVM_SEV_SEND_START. 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 Signed-off-by: Ashish Kalra --- .../virt/kvm/amd-memory-encryption.rst | 24 ++++ arch/x86/kvm/svm.c | 136 +++++++++++++++++- include/uapi/linux/kvm.h | 9 ++ 3 files changed, 165 insertions(+), 4 deletions(-) diff --git a/Documentation/virt/kvm/amd-memory-encryption.rst b/Documentation/virt/kvm/amd-memory-encryption.rst index 826911f41f3b..0f1c3860360f 100644 --- a/Documentation/virt/kvm/amd-memory-encryption.rst +++ b/Documentation/virt/kvm/amd-memory-encryption.rst @@ -265,6 +265,30 @@ Returns: 0 on success, -negative on error __u32 session_len; }; +11. KVM_SEV_SEND_UPDATE_DATA +---------------------------- + +The KVM_SEV_SEND_UPDATE_DATA command can be used by the hypervisor to encrypt the +outgoing guest memory region with the encryption context creating using +KVM_SEV_SEND_START. + +Parameters (in): struct kvm_sev_send_update_data + +Returns: 0 on success, -negative on error + +:: + + struct kvm_sev_launch_send_update_data { + __u64 hdr_uaddr; /* userspace address containing the packet header */ + __u32 hdr_len; + + __u64 guest_uaddr; /* the source memory region to be encrypted */ + __u32 guest_len; + + __u64 trans_uaddr; /* the destition memory region */ + __u32 trans_len; + }; + References ========== diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 3a7e2cac51de..ae97f774e979 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -426,6 +426,7 @@ static DECLARE_RWSEM(sev_deactivate_lock); static DEFINE_MUTEX(sev_bitmap_lock); static unsigned int max_sev_asid; static unsigned int min_sev_asid; +static unsigned long sev_me_mask; static unsigned long *sev_asid_bitmap; static unsigned long *sev_reclaim_asid_bitmap; #define __sme_page_pa(x) __sme_set(page_to_pfn(x) << PAGE_SHIFT) @@ -1231,16 +1232,22 @@ static int avic_ga_log_notifier(u32 ga_tag) static __init int sev_hardware_setup(void) { struct sev_user_data_status *status; + int eax, ebx; int rc; - /* Maximum number of encrypted guests supported simultaneously */ - max_sev_asid = cpuid_ecx(0x8000001F); + /* + * Query the memory encryption information. + * EBX: Bit 0:5 Pagetable bit position used to indicate encryption + * (aka Cbit). + * ECX: Maximum number of encrypted guests supported simultaneously. + * EDX: Minimum ASID value that should be used for SEV guest. + */ + cpuid(0x8000001f, &eax, &ebx, &max_sev_asid, &min_sev_asid); if (!max_sev_asid) return 1; - /* Minimum ASID value that should be used for SEV guest */ - min_sev_asid = cpuid_edx(0x8000001F); + sev_me_mask = 1UL << (ebx & 0x3f); /* Initialize SEV ASID bitmaps */ sev_asid_bitmap = bitmap_zalloc(max_sev_asid, GFP_KERNEL); @@ -7262,6 +7269,124 @@ static int sev_send_start(struct kvm *kvm, struct kvm_sev_cmd *argp) return ret; } +/* Userspace wants to query either header or trans length. */ +static int +__sev_send_update_data_query_lengths(struct kvm *kvm, struct kvm_sev_cmd *argp, + struct kvm_sev_send_update_data *params) +{ + struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; + struct sev_data_send_update_data *data; + int ret; + + data = kzalloc(sizeof(*data), GFP_KERNEL_ACCOUNT); + if (!data) + return -ENOMEM; + + data->handle = sev->handle; + ret = sev_issue_cmd(kvm, SEV_CMD_SEND_UPDATE_DATA, data, &argp->error); + + params->hdr_len = data->hdr_len; + params->trans_len = data->trans_len; + + if (copy_to_user((void __user *)(uintptr_t)argp->data, params, + sizeof(struct kvm_sev_send_update_data))) + ret = -EFAULT; + + kfree(data); + return ret; +} + +static int sev_send_update_data(struct kvm *kvm, struct kvm_sev_cmd *argp) +{ + struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; + struct sev_data_send_update_data *data; + struct kvm_sev_send_update_data params; + void *hdr, *trans_data; + struct page **guest_page; + unsigned long n; + int ret, offset; + + if (!sev_guest(kvm)) + return -ENOTTY; + + if (copy_from_user(¶ms, (void __user *)(uintptr_t)argp->data, + sizeof(struct kvm_sev_send_update_data))) + return -EFAULT; + + /* userspace wants to query either header or trans length */ + if (!params.trans_len || !params.hdr_len) + return __sev_send_update_data_query_lengths(kvm, argp, ¶ms); + + if (!params.trans_uaddr || !params.guest_uaddr || + !params.guest_len || !params.hdr_uaddr) + return -EINVAL; + + + /* Check if we are crossing the page boundary */ + offset = params.guest_uaddr & (PAGE_SIZE - 1); + if ((params.guest_len + offset > PAGE_SIZE)) + return -EINVAL; + + /* Pin guest memory */ + guest_page = sev_pin_memory(kvm, params.guest_uaddr & PAGE_MASK, + PAGE_SIZE, &n, 0); + if (!guest_page) + return -EFAULT; + + /* allocate memory for header and transport buffer */ + ret = -ENOMEM; + hdr = kmalloc(params.hdr_len, GFP_KERNEL_ACCOUNT); + if (!hdr) + goto e_unpin; + + trans_data = kmalloc(params.trans_len, GFP_KERNEL_ACCOUNT); + if (!trans_data) + goto e_free_hdr; + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) + goto e_free_trans_data; + + data->hdr_address = __psp_pa(hdr); + data->hdr_len = params.hdr_len; + data->trans_address = __psp_pa(trans_data); + data->trans_len = params.trans_len; + + /* The SEND_UPDATE_DATA command requires C-bit to be always set. */ + data->guest_address = (page_to_pfn(guest_page[0]) << PAGE_SHIFT) + + offset; + data->guest_address |= sev_me_mask; + data->guest_len = params.guest_len; + data->handle = sev->handle; + + ret = sev_issue_cmd(kvm, SEV_CMD_SEND_UPDATE_DATA, data, &argp->error); + + if (ret) + goto e_free; + + /* copy transport buffer to user space */ + if (copy_to_user((void __user *)(uintptr_t)params.trans_uaddr, + trans_data, params.trans_len)) { + ret = -EFAULT; + goto e_unpin; + } + + /* Copy packet header to userspace. */ + ret = copy_to_user((void __user *)(uintptr_t)params.hdr_uaddr, hdr, + params.hdr_len); + +e_free: + kfree(data); +e_free_trans_data: + kfree(trans_data); +e_free_hdr: + kfree(hdr); +e_unpin: + sev_unpin_memory(kvm, guest_page, n); + + return ret; +} + static int svm_mem_enc_op(struct kvm *kvm, void __user *argp) { struct kvm_sev_cmd sev_cmd; @@ -7306,6 +7431,9 @@ static int svm_mem_enc_op(struct kvm *kvm, void __user *argp) case KVM_SEV_SEND_START: r = sev_send_start(kvm, &sev_cmd); break; + case KVM_SEV_SEND_UPDATE_DATA: + r = sev_send_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 17bef4c245e1..d9dc81bb9c55 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -1570,6 +1570,15 @@ struct kvm_sev_send_start { __u32 session_len; }; +struct kvm_sev_send_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) -- 2.17.1