| 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 "system/kvm.h" |
| 16 | #include "migration/blocker.h" |
| 17 | #include "system/confidential-guest-support.h" |
| 18 | |
| 19 | #define TYPE_PEF_GUEST "pef-guest" |
| 20 | OBJECT_DECLARE_SIMPLE_TYPE(PefGuest, PEF_GUEST) |
| 21 | |
| 22 | typedef struct PefGuestClass PefGuestClass; |
| 23 | |
| 24 | struct PefGuestClass { |
| 25 | ConfidentialGuestSupportClass parent_class; |
| 26 | }; |
| 27 | |
| 28 | /** |
| 29 | * PefGuest: |
| 30 | * |
| 31 | * The PefGuest object is used for creating and managing a PEF |
| 32 | * guest. |
| 33 | * |
| 34 | * # $QEMU \ |
| 35 | * -object pef-guest,id=pef0 \ |
| 36 | * -machine ...,confidential-guest-support=pef0 |
| 37 | */ |
| 38 | struct PefGuest { |
| 39 | ConfidentialGuestSupport parent_obj; |
| 40 | }; |
| 41 | |
| 42 | static int kvmppc_svm_init(ConfidentialGuestSupport *cgs, Error **errp) |
| 43 | { |
| 44 | #ifdef CONFIG_KVM |
| 45 | static Error *pef_mig_blocker; |
| 46 | |
| 47 | if (!kvm_check_extension(kvm_state, KVM_CAP_PPC_SECURE_GUEST)) { |
| 48 | error_setg(errp, |
| 49 | "KVM implementation does not support Secure VMs (is an ultravisor running?)"); |
| 50 | return -1; |
| 51 | } else { |
| 52 | int ret = kvm_vm_enable_cap(kvm_state, KVM_CAP_PPC_SECURE_GUEST, 0, 1); |
| 53 | |
| 54 | if (ret < 0) { |
| 55 | error_setg(errp, |
| 56 | "Error enabling PEF with KVM"); |
| 57 | return -1; |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | /* add migration blocker */ |
| 62 | error_setg(&pef_mig_blocker, "PEF: Migration is not implemented"); |
| 63 | /* NB: This can fail if --only-migratable is used */ |
| 64 | migrate_add_blocker(&pef_mig_blocker, &error_fatal); |
| 65 | |
| 66 | cgs->ready = true; |
| 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 | static 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(cgs, errp); |
| 106 | } |
| 107 | |
| 108 | static 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, const void *data) |
| 131 | { |
| 132 | ConfidentialGuestSupportClass *klass = CONFIDENTIAL_GUEST_SUPPORT_CLASS(oc); |
| 133 | |
| 134 | klass->kvm_init = pef_kvm_init; |
| 135 | klass->kvm_reset = pef_kvm_reset; |
| 136 | } |
| 137 | |
| 138 | static void pef_guest_init(Object *obj) |
| 139 | { |
| 140 | } |
| 141 | |
| 142 | static void pef_guest_finalize(Object *obj) |
| 143 | { |
| 144 | } |