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Shutemov" , Andi Kleen , tony.luck@intel.com, marcorr@google.com, sathyanarayanan.kuppuswamy@linux.intel.com, Brijesh Singh Subject: [PATCH Part2 v5 42/45] KVM: SVM: Provide support for SNP_GUEST_REQUEST NAE event Date: Fri, 20 Aug 2021 10:59:15 -0500 Message-Id: <20210820155918.7518-43-brijesh.singh@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210820155918.7518-1-brijesh.singh@amd.com> References: <20210820155918.7518-1-brijesh.singh@amd.com> X-ClientProxiedBy: SN7P222CA0013.NAMP222.PROD.OUTLOOK.COM (2603:10b6:806:124::11) To SN6PR12MB2718.namprd12.prod.outlook.com (2603:10b6:805:6f::22) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from sbrijesh-desktop.amd.com (165.204.77.1) by SN7P222CA0013.NAMP222.PROD.OUTLOOK.COM (2603:10b6:806:124::11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4436.18 via Frontend Transport; Fri, 20 Aug 2021 16:00:46 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 406c1495-5cc7-41d9-610b-08d963f3ac88 X-MS-TrafficTypeDiagnostic: SA0PR12MB4509: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:8882; X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:SN6PR12MB2718.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(4636009)(366004)(508600001)(4326008)(36756003)(7416002)(44832011)(54906003)(316002)(66946007)(66556008)(66476007)(86362001)(7406005)(956004)(6486002)(2616005)(2906002)(83380400001)(38350700002)(38100700002)(186003)(5660300002)(8936002)(52116002)(1076003)(7696005)(8676002)(26005)(6666004);DIR:OUT;SFP:1101; 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: 406c1495-5cc7-41d9-610b-08d963f3ac88 X-MS-Exchange-CrossTenant-AuthSource: SN6PR12MB2718.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Aug 2021 16:00:47.4446 (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: jC1DdN1CVYrJYeoE8fY4sl/8d4eR5JYPRyyPRCGaYTyc+emDIMVOxrYj0HgkI89rqwpCEHI1SkIfNoKP9jBQPw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA0PR12MB4509 Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org Version 2 of GHCB specification added the support for two SNP Guest Request Message NAE events. The events allows for an SEV-SNP guest to make request to the SEV-SNP firmware through hypervisor using the SNP_GUEST_REQUEST API define in the SEV-SNP firmware specification. The SNP_EXT_GUEST_REQUEST is similar to SNP_GUEST_REQUEST with the difference of an additional certificate blob that can be passed through the SNP_SET_CONFIG ioctl defined in the CCP driver. The CCP driver provides snp_guest_ext_guest_request() that is used by the KVM to get both the report and certificate data at once. Signed-off-by: Brijesh Singh --- arch/x86/kvm/svm/sev.c | 197 +++++++++++++++++++++++++++++++++++++++-- arch/x86/kvm/svm/svm.h | 2 + 2 files changed, 193 insertions(+), 6 deletions(-) diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index 712e8907bc39..81ccad412e55 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -19,6 +19,7 @@ #include #include #include +#include #include #include @@ -338,6 +339,7 @@ static int sev_guest_init(struct kvm *kvm, struct kvm_sev_cmd *argp) init_srcu_struct(&sev->psc_srcu); ret = sev_snp_init(&argp->error); + mutex_init(&sev->guest_req_lock); } else { ret = sev_platform_init(&argp->error); } @@ -1602,23 +1604,39 @@ static int sev_receive_finish(struct kvm *kvm, struct kvm_sev_cmd *argp) static void *snp_context_create(struct kvm *kvm, struct kvm_sev_cmd *argp) { + void *context = NULL, *certs_data = NULL, *resp_page = NULL; + struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; struct sev_data_snp_gctx_create data = {}; - void *context; int rc; + /* Allocate memory used for the certs data in SNP guest request */ + certs_data = kmalloc(SEV_FW_BLOB_MAX_SIZE, GFP_KERNEL_ACCOUNT); + if (!certs_data) + return NULL; + /* Allocate memory for context page */ context = snp_alloc_firmware_page(GFP_KERNEL_ACCOUNT); if (!context) - return NULL; + goto e_free; + + /* Allocate a firmware buffer used during the guest command handling. */ + resp_page = snp_alloc_firmware_page(GFP_KERNEL_ACCOUNT); + if (!resp_page) + goto e_free; 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; - } + if (rc) + goto e_free; + + sev->snp_certs_data = certs_data; return context; + +e_free: + snp_free_firmware_page(context); + kfree(certs_data); + return NULL; } static int snp_bind_asid(struct kvm *kvm, int *error) @@ -2248,6 +2266,8 @@ static int snp_decommission_context(struct kvm *kvm) snp_free_firmware_page(sev->snp_context); sev->snp_context = NULL; + kfree(sev->snp_certs_data); + return 0; } @@ -2746,6 +2766,8 @@ static int sev_es_validate_vmgexit(struct vcpu_svm *svm, u64 *exit_code) case SVM_VMGEXIT_UNSUPPORTED_EVENT: case SVM_VMGEXIT_HV_FEATURES: case SVM_VMGEXIT_PSC: + case SVM_VMGEXIT_GUEST_REQUEST: + case SVM_VMGEXIT_EXT_GUEST_REQUEST: break; default: goto vmgexit_err; @@ -3161,6 +3183,155 @@ static unsigned long snp_handle_page_state_change(struct vcpu_svm *svm) return rc ? map_to_psc_vmgexit_code(rc) : 0; } +static unsigned long snp_setup_guest_buf(struct vcpu_svm *svm, + struct sev_data_snp_guest_request *data, + gpa_t req_gpa, gpa_t resp_gpa) +{ + struct kvm_vcpu *vcpu = &svm->vcpu; + struct kvm *kvm = vcpu->kvm; + kvm_pfn_t req_pfn, resp_pfn; + struct kvm_sev_info *sev; + + sev = &to_kvm_svm(kvm)->sev_info; + + if (!IS_ALIGNED(req_gpa, PAGE_SIZE) || !IS_ALIGNED(resp_gpa, PAGE_SIZE)) + return SEV_RET_INVALID_PARAM; + + req_pfn = gfn_to_pfn(kvm, gpa_to_gfn(req_gpa)); + if (is_error_noslot_pfn(req_pfn)) + return SEV_RET_INVALID_ADDRESS; + + resp_pfn = gfn_to_pfn(kvm, gpa_to_gfn(resp_gpa)); + if (is_error_noslot_pfn(resp_pfn)) + return SEV_RET_INVALID_ADDRESS; + + if (rmp_make_private(resp_pfn, 0, PG_LEVEL_4K, 0, true)) + return SEV_RET_INVALID_ADDRESS; + + data->gctx_paddr = __psp_pa(sev->snp_context); + data->req_paddr = __sme_set(req_pfn << PAGE_SHIFT); + data->res_paddr = __sme_set(resp_pfn << PAGE_SHIFT); + + return 0; +} + +static void snp_cleanup_guest_buf(struct sev_data_snp_guest_request *data, unsigned long *rc) +{ + u64 pfn = __sme_clr(data->res_paddr) >> PAGE_SHIFT; + int ret; + + ret = snp_page_reclaim(pfn); + if (ret) + *rc = SEV_RET_INVALID_ADDRESS; + + ret = rmp_make_shared(pfn, PG_LEVEL_4K); + if (ret) + *rc = SEV_RET_INVALID_ADDRESS; +} + +static void snp_handle_guest_request(struct vcpu_svm *svm, gpa_t req_gpa, gpa_t resp_gpa) +{ + struct sev_data_snp_guest_request data = {0}; + struct kvm_vcpu *vcpu = &svm->vcpu; + struct kvm *kvm = vcpu->kvm; + struct kvm_sev_info *sev; + unsigned long rc; + int err; + + if (!sev_snp_guest(vcpu->kvm)) { + rc = SEV_RET_INVALID_GUEST; + goto e_fail; + } + + sev = &to_kvm_svm(kvm)->sev_info; + + mutex_lock(&sev->guest_req_lock); + + rc = snp_setup_guest_buf(svm, &data, req_gpa, resp_gpa); + if (rc) + goto unlock; + + rc = sev_issue_cmd(kvm, SEV_CMD_SNP_GUEST_REQUEST, &data, &err); + if (rc) + /* use the firmware error code */ + rc = err; + + snp_cleanup_guest_buf(&data, &rc); + +unlock: + mutex_unlock(&sev->guest_req_lock); + +e_fail: + svm_set_ghcb_sw_exit_info_2(vcpu, rc); +} + +static void snp_handle_ext_guest_request(struct vcpu_svm *svm, gpa_t req_gpa, gpa_t resp_gpa) +{ + struct sev_data_snp_guest_request req = {0}; + struct kvm_vcpu *vcpu = &svm->vcpu; + struct kvm *kvm = vcpu->kvm; + unsigned long data_npages; + struct kvm_sev_info *sev; + unsigned long rc, err; + u64 data_gpa; + + if (!sev_snp_guest(vcpu->kvm)) { + rc = SEV_RET_INVALID_GUEST; + goto e_fail; + } + + sev = &to_kvm_svm(kvm)->sev_info; + + data_gpa = vcpu->arch.regs[VCPU_REGS_RAX]; + data_npages = vcpu->arch.regs[VCPU_REGS_RBX]; + + if (!IS_ALIGNED(data_gpa, PAGE_SIZE)) { + rc = SEV_RET_INVALID_ADDRESS; + goto e_fail; + } + + /* Verify that requested blob will fit in certificate buffer */ + if ((data_npages << PAGE_SHIFT) > SEV_FW_BLOB_MAX_SIZE) { + rc = SEV_RET_INVALID_PARAM; + goto e_fail; + } + + mutex_lock(&sev->guest_req_lock); + + rc = snp_setup_guest_buf(svm, &req, req_gpa, resp_gpa); + if (rc) + goto unlock; + + rc = snp_guest_ext_guest_request(&req, (unsigned long)sev->snp_certs_data, + &data_npages, &err); + if (rc) { + /* + * If buffer length is small then return the expected + * length in rbx. + */ + if (err == SNP_GUEST_REQ_INVALID_LEN) + vcpu->arch.regs[VCPU_REGS_RBX] = data_npages; + + /* pass the firmware error code */ + rc = err; + goto cleanup; + } + + /* Copy the certificate blob in the guest memory */ + if (data_npages && + kvm_write_guest(kvm, data_gpa, sev->snp_certs_data, data_npages << PAGE_SHIFT)) + rc = SEV_RET_INVALID_ADDRESS; + +cleanup: + snp_cleanup_guest_buf(&req, &rc); + +unlock: + mutex_unlock(&sev->guest_req_lock); + +e_fail: + svm_set_ghcb_sw_exit_info_2(vcpu, rc); +} + static int sev_handle_vmgexit_msr_protocol(struct vcpu_svm *svm) { struct vmcb_control_area *control = &svm->vmcb->control; @@ -3404,6 +3575,20 @@ int sev_handle_vmgexit(struct kvm_vcpu *vcpu) svm_set_ghcb_sw_exit_info_2(vcpu, rc); break; } + case SVM_VMGEXIT_GUEST_REQUEST: { + snp_handle_guest_request(svm, control->exit_info_1, control->exit_info_2); + + ret = 1; + break; + } + case SVM_VMGEXIT_EXT_GUEST_REQUEST: { + snp_handle_ext_guest_request(svm, + control->exit_info_1, + control->exit_info_2); + + ret = 1; + break; + } case SVM_VMGEXIT_UNSUPPORTED_EVENT: vcpu_unimpl(vcpu, "vmgexit: unsupported event - exit_info_1=%#llx, exit_info_2=%#llx\n", diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h index 280072995306..71fe46a778f3 100644 --- a/arch/x86/kvm/svm/svm.h +++ b/arch/x86/kvm/svm/svm.h @@ -92,6 +92,8 @@ struct kvm_sev_info { u64 snp_init_flags; void *snp_context; /* SNP guest context page */ struct srcu_struct psc_srcu; + void *snp_certs_data; + struct mutex guest_req_lock; }; struct kvm_svm {