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Peter Anvin" , Ard Biesheuvel , Paolo Bonzini , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Andy Lutomirski , Dave Hansen , Sergio Lopez , Peter Gonda , Peter Zijlstra , Srinivas Pandruvada , David Rientjes , Dov Murik , Tobin Feldman-Fitzthum , Borislav Petkov , Michael Roth , Vlastimil Babka , tony.luck@intel.com, npmccallum@redhat.com, brijesh.ksingh@gmail.com, Brijesh Singh Subject: [PATCH Part2 RFC v4 23/40] KVM: SVM: Add KVM_SEV_SNP_LAUNCH_START command Date: Wed, 7 Jul 2021 13:35:59 -0500 Message-Id: <20210707183616.5620-24-brijesh.singh@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210707183616.5620-1-brijesh.singh@amd.com> References: <20210707183616.5620-1-brijesh.singh@amd.com> X-ClientProxiedBy: SN6PR04CA0078.namprd04.prod.outlook.com (2603:10b6:805:f2::19) To BYAPR12MB2711.namprd12.prod.outlook.com (2603:10b6:a03:63::10) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from sbrijesh-desktop.amd.com (165.204.77.1) by SN6PR04CA0078.namprd04.prod.outlook.com (2603:10b6:805:f2::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4308.20 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: 15511bc3-1fe7-4ec8-39e1-08d941765558 X-MS-Exchange-CrossTenant-AuthSource: BYAPR12MB2711.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Jul 2021 18:37:54.5436 (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: CihhDUUbkFh02SGaIrx8/bqWVhe1A2ica8zjzxB+yltect4kGYVfOUkbmnuwUt/z6Gx5+qXVn2Das0xoUPvAzA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR12MB2808 Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org KVM_SEV_SNP_LAUNCH_START begins the launch process for an SEV-SNP guest. The command initializes a cryptographic digest context used to construct the measurement of the guest. If the guest is expected to be migrated, the command also binds a migration agent (MA) to the guest. For more information see the SEV-SNP specification. Signed-off-by: Brijesh Singh --- .../virt/kvm/amd-memory-encryption.rst | 25 ++++ arch/x86/kvm/svm/sev.c | 132 +++++++++++++++++- arch/x86/kvm/svm/svm.h | 1 + include/uapi/linux/kvm.h | 9 ++ 4 files changed, 166 insertions(+), 1 deletion(-) diff --git a/Documentation/virt/kvm/amd-memory-encryption.rst b/Documentation/virt/kvm/amd-memory-encryption.rst index 75ca60b6d40a..8620383d405a 100644 --- a/Documentation/virt/kvm/amd-memory-encryption.rst +++ b/Documentation/virt/kvm/amd-memory-encryption.rst @@ -443,6 +443,31 @@ Returns: 0 on success, -negative on error __u64 flags; /* must be zero */ }; + +19. KVM_SNP_LAUNCH_START +------------------------ + +The KVM_SNP_LAUNCH_START command is used for creating the memory encryption +context for the SEV-SNP guest. To create the encryption context, user must +provide a guest policy, migration agent (if any) and guest OS visible +workarounds value as defined SEV-SNP specification. + +Parameters (in): struct kvm_snp_launch_start + +Returns: 0 on success, -negative on error + +:: + + struct kvm_sev_snp_launch_start { + __u64 policy; /* Guest policy to use. */ + __u64 ma_uaddr; /* userspace address of migration agent */ + __u8 ma_en; /* 1 if the migtation agent is enabled */ + __u8 imi_en; /* set IMI to 1. */ + __u8 gosvw[16]; /* guest OS visible workarounds */ + }; + +See the SEV-SNP specification for further detail on the launch input. + References ========== diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index be31221f0a47..f44a657e8912 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -20,6 +20,7 @@ #include #include +#include #include "x86.h" #include "svm.h" @@ -75,6 +76,8 @@ static unsigned long sev_me_mask; static unsigned long *sev_asid_bitmap; static unsigned long *sev_reclaim_asid_bitmap; +static int snp_decommission_context(struct kvm *kvm); + struct enc_region { struct list_head list; unsigned long npages; @@ -1527,6 +1530,100 @@ static int sev_receive_finish(struct kvm *kvm, struct kvm_sev_cmd *argp) return sev_issue_cmd(kvm, SEV_CMD_RECEIVE_FINISH, &data, &argp->error); } +static void *snp_context_create(struct kvm *kvm, struct kvm_sev_cmd *argp) +{ + struct sev_data_snp_gctx_create data = {}; + void *context; + int rc; + + /* Allocate memory for context page */ + context = snp_alloc_firmware_page(GFP_KERNEL_ACCOUNT); + if (!context) + return NULL; + + data.gctx_paddr = __psp_pa(context); + rc = __sev_issue_cmd(argp->sev_fd, SEV_CMD_SNP_GCTX_CREATE, &data, &argp->error); + if (rc) { + snp_free_firmware_page(context); + return NULL; + } + + return context; +} + +static int snp_bind_asid(struct kvm *kvm, int *error) +{ + struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; + struct sev_data_snp_activate data = {}; + int asid = sev_get_asid(kvm); + int ret, retry_count = 0; + + /* Activate ASID on the given context */ + data.gctx_paddr = __psp_pa(sev->snp_context); + data.asid = asid; +again: + ret = sev_issue_cmd(kvm, SEV_CMD_SNP_ACTIVATE, &data, error); + + /* Check if the DF_FLUSH is required, and try again */ + if (ret && (*error == SEV_RET_DFFLUSH_REQUIRED) && (!retry_count)) { + /* Guard DEACTIVATE against WBINVD/DF_FLUSH used in ASID recycling */ + down_read(&sev_deactivate_lock); + wbinvd_on_all_cpus(); + ret = snp_guest_df_flush(error); + up_read(&sev_deactivate_lock); + + if (ret) + return ret; + + /* only one retry */ + retry_count = 1; + + goto again; + } + + return ret; +} + +static int snp_launch_start(struct kvm *kvm, struct kvm_sev_cmd *argp) +{ + struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; + struct sev_data_snp_launch_start start = {}; + struct kvm_sev_snp_launch_start params; + int rc; + + if (!sev_snp_guest(kvm)) + return -ENOTTY; + + if (copy_from_user(¶ms, (void __user *)(uintptr_t)argp->data, sizeof(params))) + return -EFAULT; + + /* Initialize the guest context */ + sev->snp_context = snp_context_create(kvm, argp); + if (!sev->snp_context) + return -ENOTTY; + + /* Issue the LAUNCH_START command */ + start.gctx_paddr = __psp_pa(sev->snp_context); + start.policy = params.policy; + memcpy(start.gosvw, params.gosvw, sizeof(params.gosvw)); + rc = __sev_issue_cmd(argp->sev_fd, SEV_CMD_SNP_LAUNCH_START, &start, &argp->error); + if (rc) + goto e_free_context; + + /* Bind ASID to this guest */ + sev->fd = argp->sev_fd; + rc = snp_bind_asid(kvm, &argp->error); + if (rc) + goto e_free_context; + + return 0; + +e_free_context: + snp_decommission_context(kvm); + + return rc; +} + int svm_mem_enc_op(struct kvm *kvm, void __user *argp) { struct kvm_sev_cmd sev_cmd; @@ -1616,6 +1713,9 @@ int svm_mem_enc_op(struct kvm *kvm, void __user *argp) case KVM_SEV_RECEIVE_FINISH: r = sev_receive_finish(kvm, &sev_cmd); break; + case KVM_SEV_SNP_LAUNCH_START: + r = snp_launch_start(kvm, &sev_cmd); + break; default: r = -EINVAL; goto out; @@ -1809,6 +1909,28 @@ int svm_vm_copy_asid_from(struct kvm *kvm, unsigned int source_fd) return ret; } +static int snp_decommission_context(struct kvm *kvm) +{ + struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; + struct sev_data_snp_decommission data = {}; + int ret; + + /* If context is not created then do nothing */ + if (!sev->snp_context) + return 0; + + data.gctx_paddr = __sme_pa(sev->snp_context); + ret = snp_guest_decommission(&data, NULL); + if (ret) + return ret; + + /* free the context page now */ + snp_free_firmware_page(sev->snp_context); + sev->snp_context = NULL; + + return 0; +} + void sev_vm_destroy(struct kvm *kvm) { struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; @@ -1847,7 +1969,15 @@ void sev_vm_destroy(struct kvm *kvm) mutex_unlock(&kvm->lock); - sev_unbind_asid(kvm, sev->handle); + if (sev_snp_guest(kvm)) { + if (snp_decommission_context(kvm)) { + pr_err("Failed to free SNP guest context, leaking asid!\n"); + return; + } + } else { + sev_unbind_asid(kvm, sev->handle); + } + sev_asid_free(sev); } diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h index b9ea99f8579e..bc5582b44356 100644 --- a/arch/x86/kvm/svm/svm.h +++ b/arch/x86/kvm/svm/svm.h @@ -67,6 +67,7 @@ struct kvm_sev_info { u64 ap_jump_table; /* SEV-ES AP Jump Table address */ struct kvm *enc_context_owner; /* Owner of copied encryption context */ struct misc_cg *misc_cg; /* For misc cgroup accounting */ + void *snp_context; /* SNP guest context page */ }; struct kvm_svm { diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index 989a64aa1ae5..dbd05179d8fa 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -1680,6 +1680,7 @@ enum sev_cmd_id { /* SNP specific commands */ KVM_SEV_SNP_INIT = 256, + KVM_SEV_SNP_LAUNCH_START, KVM_SEV_NR_MAX, }; @@ -1781,6 +1782,14 @@ struct kvm_snp_init { __u64 flags; }; +struct kvm_sev_snp_launch_start { + __u64 policy; + __u64 ma_uaddr; + __u8 ma_en; + __u8 imi_en; + __u8 gosvw[16]; +}; + #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)