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 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 return 0; 62 #else 63 g_assert_not_reached(); 64 #endif 65 } 66 67 /* 68 * Don't set error if KVM_PPC_SVM_OFF ioctl is invoked on kernels 69 * that don't support this ioctl. 70 */ 71 static int kvmppc_svm_off(Error **errp) 72 { 73 #ifdef CONFIG_KVM 74 int rc; 75 76 rc = kvm_vm_ioctl(KVM_STATE(current_accel()), KVM_PPC_SVM_OFF); 77 if (rc && rc != -ENOTTY) { 78 error_setg_errno(errp, -rc, "KVM_PPC_SVM_OFF ioctl failed"); 79 return rc; 80 } 81 return 0; 82 #else 83 g_assert_not_reached(); 84 #endif 85 } 86 87 int pef_kvm_init(ConfidentialGuestSupport *cgs, Error **errp) 88 { 89 if (!object_dynamic_cast(OBJECT(cgs), TYPE_PEF_GUEST)) { 90 return 0; 91 } 92 93 if (!kvm_enabled()) { 94 error_setg(errp, "PEF requires KVM"); 95 return -1; 96 } 97 98 return kvmppc_svm_init(errp); 99 } 100 101 int pef_kvm_reset(ConfidentialGuestSupport *cgs, Error **errp) 102 { 103 if (!object_dynamic_cast(OBJECT(cgs), TYPE_PEF_GUEST)) { 104 return 0; 105 } 106 107 /* 108 * If we don't have KVM we should never have been able to 109 * initialize PEF, so we should never get this far 110 */ 111 assert(kvm_enabled()); 112 113 return kvmppc_svm_off(errp); 114 } 115 116 OBJECT_DEFINE_TYPE_WITH_INTERFACES(PefGuest, 117 pef_guest, 118 PEF_GUEST, 119 CONFIDENTIAL_GUEST_SUPPORT, 120 { TYPE_USER_CREATABLE }, 121 { NULL }) 122 123 static void pef_guest_class_init(ObjectClass *oc, void *data) 124 { 125 } 126 127 static void pef_guest_init(Object *obj) 128 { 129 } 130 131 static void pef_guest_finalize(Object *obj) 132 { 133 } 134