1 /* 2 * ARM Generic Interrupt Controller using KVM in-kernel support 3 * 4 * Copyright (c) 2015 Samsung Electronics Co., Ltd. 5 * Written by Pavel Fedin 6 * Based on vGICv2 code by Peter Maydell 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation, either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License along 19 * with this program; if not, see <http://www.gnu.org/licenses/>. 20 */ 21 22 #include "qemu/osdep.h" 23 #include "qapi/error.h" 24 #include "hw/intc/arm_gicv3_common.h" 25 #include "hw/sysbus.h" 26 #include "sysemu/kvm.h" 27 #include "kvm_arm.h" 28 #include "vgic_common.h" 29 #include "migration/migration.h" 30 31 #ifdef DEBUG_GICV3_KVM 32 #define DPRINTF(fmt, ...) \ 33 do { fprintf(stderr, "kvm_gicv3: " fmt, ## __VA_ARGS__); } while (0) 34 #else 35 #define DPRINTF(fmt, ...) \ 36 do { } while (0) 37 #endif 38 39 #define TYPE_KVM_ARM_GICV3 "kvm-arm-gicv3" 40 #define KVM_ARM_GICV3(obj) \ 41 OBJECT_CHECK(GICv3State, (obj), TYPE_KVM_ARM_GICV3) 42 #define KVM_ARM_GICV3_CLASS(klass) \ 43 OBJECT_CLASS_CHECK(KVMARMGICv3Class, (klass), TYPE_KVM_ARM_GICV3) 44 #define KVM_ARM_GICV3_GET_CLASS(obj) \ 45 OBJECT_GET_CLASS(KVMARMGICv3Class, (obj), TYPE_KVM_ARM_GICV3) 46 47 typedef struct KVMARMGICv3Class { 48 ARMGICv3CommonClass parent_class; 49 DeviceRealize parent_realize; 50 void (*parent_reset)(DeviceState *dev); 51 } KVMARMGICv3Class; 52 53 static void kvm_arm_gicv3_set_irq(void *opaque, int irq, int level) 54 { 55 GICv3State *s = (GICv3State *)opaque; 56 57 kvm_arm_gic_set_irq(s->num_irq, irq, level); 58 } 59 60 static void kvm_arm_gicv3_put(GICv3State *s) 61 { 62 /* TODO */ 63 DPRINTF("Cannot put kernel gic state, no kernel interface\n"); 64 } 65 66 static void kvm_arm_gicv3_get(GICv3State *s) 67 { 68 /* TODO */ 69 DPRINTF("Cannot get kernel gic state, no kernel interface\n"); 70 } 71 72 static void kvm_arm_gicv3_reset(DeviceState *dev) 73 { 74 GICv3State *s = ARM_GICV3_COMMON(dev); 75 KVMARMGICv3Class *kgc = KVM_ARM_GICV3_GET_CLASS(s); 76 77 DPRINTF("Reset\n"); 78 79 kgc->parent_reset(dev); 80 kvm_arm_gicv3_put(s); 81 } 82 83 static void kvm_arm_gicv3_realize(DeviceState *dev, Error **errp) 84 { 85 GICv3State *s = KVM_ARM_GICV3(dev); 86 KVMARMGICv3Class *kgc = KVM_ARM_GICV3_GET_CLASS(s); 87 Error *local_err = NULL; 88 int i; 89 90 DPRINTF("kvm_arm_gicv3_realize\n"); 91 92 kgc->parent_realize(dev, &local_err); 93 if (local_err) { 94 error_propagate(errp, local_err); 95 return; 96 } 97 98 if (s->security_extn) { 99 error_setg(errp, "the in-kernel VGICv3 does not implement the " 100 "security extensions"); 101 return; 102 } 103 104 gicv3_init_irqs_and_mmio(s, kvm_arm_gicv3_set_irq, NULL); 105 106 /* Block migration of a KVM GICv3 device: the API for saving and restoring 107 * the state in the kernel is not yet finalised in the kernel or 108 * implemented in QEMU. 109 */ 110 error_setg(&s->migration_blocker, "vGICv3 migration is not implemented"); 111 migrate_add_blocker(s->migration_blocker, &local_err); 112 if (local_err) { 113 error_propagate(errp, local_err); 114 error_free(s->migration_blocker); 115 return; 116 } 117 118 /* Try to create the device via the device control API */ 119 s->dev_fd = kvm_create_device(kvm_state, KVM_DEV_TYPE_ARM_VGIC_V3, false); 120 if (s->dev_fd < 0) { 121 error_setg_errno(errp, -s->dev_fd, "error creating in-kernel VGIC"); 122 return; 123 } 124 125 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_NR_IRQS, 126 0, &s->num_irq, true); 127 128 /* Tell the kernel to complete VGIC initialization now */ 129 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL, 130 KVM_DEV_ARM_VGIC_CTRL_INIT, NULL, true); 131 132 kvm_arm_register_device(&s->iomem_dist, -1, KVM_DEV_ARM_VGIC_GRP_ADDR, 133 KVM_VGIC_V3_ADDR_TYPE_DIST, s->dev_fd); 134 kvm_arm_register_device(&s->iomem_redist, -1, KVM_DEV_ARM_VGIC_GRP_ADDR, 135 KVM_VGIC_V3_ADDR_TYPE_REDIST, s->dev_fd); 136 137 if (kvm_has_gsi_routing()) { 138 /* set up irq routing */ 139 kvm_init_irq_routing(kvm_state); 140 for (i = 0; i < s->num_irq - GIC_INTERNAL; ++i) { 141 kvm_irqchip_add_irq_route(kvm_state, i, 0, i); 142 } 143 144 kvm_gsi_routing_allowed = true; 145 146 kvm_irqchip_commit_routes(kvm_state); 147 } 148 } 149 150 static void kvm_arm_gicv3_class_init(ObjectClass *klass, void *data) 151 { 152 DeviceClass *dc = DEVICE_CLASS(klass); 153 ARMGICv3CommonClass *agcc = ARM_GICV3_COMMON_CLASS(klass); 154 KVMARMGICv3Class *kgc = KVM_ARM_GICV3_CLASS(klass); 155 156 agcc->pre_save = kvm_arm_gicv3_get; 157 agcc->post_load = kvm_arm_gicv3_put; 158 kgc->parent_realize = dc->realize; 159 kgc->parent_reset = dc->reset; 160 dc->realize = kvm_arm_gicv3_realize; 161 dc->reset = kvm_arm_gicv3_reset; 162 } 163 164 static const TypeInfo kvm_arm_gicv3_info = { 165 .name = TYPE_KVM_ARM_GICV3, 166 .parent = TYPE_ARM_GICV3_COMMON, 167 .instance_size = sizeof(GICv3State), 168 .class_init = kvm_arm_gicv3_class_init, 169 .class_size = sizeof(KVMARMGICv3Class), 170 }; 171 172 static void kvm_arm_gicv3_register_types(void) 173 { 174 type_register_static(&kvm_arm_gicv3_info); 175 } 176 177 type_init(kvm_arm_gicv3_register_types) 178