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Tue, 5 May 2020 21:15:05 +0000 From: Ashish Kalra To: pbonzini@redhat.com Cc: tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, joro@8bytes.org, bp@suse.de, Thomas.Lendacky@amd.com, x86@kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, srutherford@google.com, rientjes@google.com, venu.busireddy@oracle.com, brijesh.singh@amd.com Subject: [PATCH v8 02/18] KVM: SVM: Add KVM_SEND_UPDATE_DATA command Date: Tue, 5 May 2020 21:14:54 +0000 Message-Id: <1f43054f423c956e5fdf9c0fbad0c18be4ea3935.1588711355.git.ashish.kalra@amd.com> 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: SN4PR0501CA0063.namprd05.prod.outlook.com (2603:10b6:803:41::40) To DM5PR12MB1386.namprd12.prod.outlook.com (2603:10b6:3:77::9) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from ashkalra_ubuntu_server.amd.com (165.204.77.1) by SN4PR0501CA0063.namprd05.prod.outlook.com (2603:10b6:803:41::40) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2979.14 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData: 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 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: cd5207fa-e991-433e-9a1b-08d7f13961bd X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 May 2020 21:15:05.4048 (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: LS6AV3+W/vBtlmZDCm9gLKvwQNEBn+0rbsyq92unyHgvSEgsKmdIgAFv0rLhZzUxnnJ0Ruk+EKROz3iCUvFYtA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR12MB2518 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 Reviewed-by : Steve Rutherford Signed-off-by: Brijesh Singh Signed-off-by: Ashish Kalra --- .../virt/kvm/amd-memory-encryption.rst | 24 ++++ arch/x86/kvm/svm/sev.c | 135 +++++++++++++++++- include/uapi/linux/kvm.h | 9 ++ 3 files changed, 164 insertions(+), 4 deletions(-) diff --git a/Documentation/virt/kvm/amd-memory-encryption.rst b/Documentation/virt/kvm/amd-memory-encryption.rst index 59cb59bd4675..d0dfa5b54e4f 100644 --- a/Documentation/virt/kvm/amd-memory-encryption.rst +++ b/Documentation/virt/kvm/amd-memory-encryption.rst @@ -290,6 +290,30 @@ 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/sev.c b/arch/x86/kvm/svm/sev.c index 5a15b43b4349..7031b660f64d 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -23,6 +23,7 @@ static DECLARE_RWSEM(sev_deactivate_lock); static DEFINE_MUTEX(sev_bitmap_lock); 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) @@ -1035,6 +1036,123 @@ 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_free; + } + + /* 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; +} + int svm_mem_enc_op(struct kvm *kvm, void __user *argp) { struct kvm_sev_cmd sev_cmd; @@ -1082,6 +1200,9 @@ 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; @@ -1238,16 +1359,22 @@ void sev_vm_destroy(struct kvm *kvm) int __init sev_hardware_setup(void) { struct sev_user_data_status *status; + u32 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 (!svm_sev_enabled()) 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); diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index 8827d43e2684..7aaed8ee33cf 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -1610,6 +1610,15 @@ 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