1 /* 2 * PEF (Protected Execution Facility) for POWER support 3 * 4 * Copyright Red Hat. 5 * 6 * This work is licensed under the terms of the GNU GPL, version 2 or later. 7 * See the COPYING file in the top-level directory. 8 * 9 */ 10 11 #include "qemu/osdep.h" 12 13 #include "qapi/error.h" 14 #include "qom/object_interfaces.h" 15 #include "sysemu/kvm.h" 16 #include "migration/blocker.h" 17 #include "exec/confidential-guest-support.h" 18 #include "hw/ppc/pef.h" 19 20 #define TYPE_PEF_GUEST "pef-guest" 21 OBJECT_DECLARE_SIMPLE_TYPE(PefGuest, PEF_GUEST) 22 23 typedef struct PefGuest PefGuest; 24 typedef struct PefGuestClass PefGuestClass; 25 26 struct PefGuestClass { 27 ConfidentialGuestSupportClass parent_class; 28 }; 29 30 /** 31 * PefGuest: 32 * 33 * The PefGuest object is used for creating and managing a PEF 34 * guest. 35 * 36 * # $QEMU \ 37 * -object pef-guest,id=pef0 \ 38 * -machine ...,confidential-guest-support=pef0 39 */ 40 struct PefGuest { 41 ConfidentialGuestSupport parent_obj; 42 }; 43 44 static int kvmppc_svm_init(Error **errp) 45 { 46 #ifdef CONFIG_KVM 47 static Error *pef_mig_blocker; 48 49 if (!kvm_check_extension(kvm_state, KVM_CAP_PPC_SECURE_GUEST)) { 50 error_setg(errp, 51 "KVM implementation does not support Secure VMs (is an ultravisor running?)"); 52 return -1; 53 } else { 54 int ret = kvm_vm_enable_cap(kvm_state, KVM_CAP_PPC_SECURE_GUEST, 0, 1); 55 56 if (ret < 0) { 57 error_setg(errp, 58 "Error enabling PEF with KVM"); 59 return -1; 60 } 61 } 62 63 /* add migration blocker */ 64 error_setg(&pef_mig_blocker, "PEF: Migration is not implemented"); 65 /* NB: This can fail if --only-migratable is used */ 66 migrate_add_blocker(pef_mig_blocker, &error_fatal); 67 68 return 0; 69 #else 70 g_assert_not_reached(); 71 #endif 72 } 73 74 /* 75 * Don't set error if KVM_PPC_SVM_OFF ioctl is invoked on kernels 76 * that don't support this ioctl. 77 */ 78 static int kvmppc_svm_off(Error **errp) 79 { 80 #ifdef CONFIG_KVM 81 int rc; 82 83 rc = kvm_vm_ioctl(KVM_STATE(current_accel()), KVM_PPC_SVM_OFF); 84 if (rc && rc != -ENOTTY) { 85 error_setg_errno(errp, -rc, "KVM_PPC_SVM_OFF ioctl failed"); 86 return rc; 87 } 88 return 0; 89 #else 90 g_assert_not_reached(); 91 #endif 92 } 93 94 int pef_kvm_init(ConfidentialGuestSupport *cgs, Error **errp) 95 { 96 if (!object_dynamic_cast(OBJECT(cgs), TYPE_PEF_GUEST)) { 97 return 0; 98 } 99 100 if (!kvm_enabled()) { 101 error_setg(errp, "PEF requires KVM"); 102 return -1; 103 } 104 105 return kvmppc_svm_init(errp); 106 } 107 108 int pef_kvm_reset(ConfidentialGuestSupport *cgs, Error **errp) 109 { 110 if (!object_dynamic_cast(OBJECT(cgs), TYPE_PEF_GUEST)) { 111 return 0; 112 } 113 114 /* 115 * If we don't have KVM we should never have been able to 116 * initialize PEF, so we should never get this far 117 */ 118 assert(kvm_enabled()); 119 120 return kvmppc_svm_off(errp); 121 } 122 123 OBJECT_DEFINE_TYPE_WITH_INTERFACES(PefGuest, 124 pef_guest, 125 PEF_GUEST, 126 CONFIDENTIAL_GUEST_SUPPORT, 127 { TYPE_USER_CREATABLE }, 128 { NULL }) 129 130 static void pef_guest_class_init(ObjectClass *oc, void *data) 131 { 132 } 133 134 static void pef_guest_init(Object *obj) 135 { 136 } 137 138 static void pef_guest_finalize(Object *obj) 139 { 140 } 141