1 /* 2 * KVM-based ITS implementation for a GICv3-based system 3 * 4 * Copyright (c) 2015 Samsung Electronics Co., Ltd. 5 * Written by Pavel Fedin <p.fedin@samsung.com> 6 * 7 * This library is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * This library is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with this library; if not, see <http://www.gnu.org/licenses/>. 19 */ 20 21 #include "qemu/osdep.h" 22 #include "qapi/error.h" 23 #include "qemu/module.h" 24 #include "qemu/error-report.h" 25 #include "hw/intc/arm_gicv3_its_common.h" 26 #include "hw/qdev-properties.h" 27 #include "sysemu/runstate.h" 28 #include "sysemu/kvm.h" 29 #include "kvm_arm.h" 30 #include "migration/blocker.h" 31 #include "qom/object.h" 32 33 #define TYPE_KVM_ARM_ITS "arm-its-kvm" 34 typedef struct KVMARMITSClass KVMARMITSClass; 35 /* This is reusing the GICv3ITSState typedef from ARM_GICV3_ITS_COMMON */ 36 DECLARE_OBJ_CHECKERS(GICv3ITSState, KVMARMITSClass, 37 KVM_ARM_ITS, TYPE_KVM_ARM_ITS) 38 39 struct KVMARMITSClass { 40 GICv3ITSCommonClass parent_class; 41 ResettablePhases parent_phases; 42 }; 43 44 45 static int kvm_its_send_msi(GICv3ITSState *s, uint32_t value, uint16_t devid) 46 { 47 struct kvm_msi msi; 48 49 if (unlikely(!s->translater_gpa_known)) { 50 MemoryRegion *mr = &s->iomem_its_translation; 51 MemoryRegionSection mrs; 52 53 mrs = memory_region_find(mr, 0, 1); 54 memory_region_unref(mrs.mr); 55 s->gits_translater_gpa = mrs.offset_within_address_space + 0x40; 56 s->translater_gpa_known = true; 57 } 58 59 msi.address_lo = extract64(s->gits_translater_gpa, 0, 32); 60 msi.address_hi = extract64(s->gits_translater_gpa, 32, 32); 61 msi.data = le32_to_cpu(value); 62 msi.flags = KVM_MSI_VALID_DEVID; 63 msi.devid = devid; 64 memset(msi.pad, 0, sizeof(msi.pad)); 65 66 return kvm_vm_ioctl(kvm_state, KVM_SIGNAL_MSI, &msi); 67 } 68 69 /** 70 * vm_change_state_handler - VM change state callback aiming at flushing 71 * ITS tables into guest RAM 72 * 73 * The tables get flushed to guest RAM whenever the VM gets stopped. 74 */ 75 static void vm_change_state_handler(void *opaque, bool running, 76 RunState state) 77 { 78 GICv3ITSState *s = (GICv3ITSState *)opaque; 79 Error *err = NULL; 80 81 if (running) { 82 return; 83 } 84 85 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL, 86 KVM_DEV_ARM_ITS_SAVE_TABLES, NULL, true, &err); 87 if (err) { 88 error_report_err(err); 89 } 90 } 91 92 static void kvm_arm_its_realize(DeviceState *dev, Error **errp) 93 { 94 GICv3ITSState *s = ARM_GICV3_ITS_COMMON(dev); 95 96 s->dev_fd = kvm_create_device(kvm_state, KVM_DEV_TYPE_ARM_VGIC_ITS, false); 97 if (s->dev_fd < 0) { 98 error_setg_errno(errp, -s->dev_fd, "error creating in-kernel ITS"); 99 return; 100 } 101 102 /* explicit init of the ITS */ 103 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL, 104 KVM_DEV_ARM_VGIC_CTRL_INIT, NULL, true, &error_abort); 105 106 /* register the base address */ 107 kvm_arm_register_device(&s->iomem_its_cntrl, -1, KVM_DEV_ARM_VGIC_GRP_ADDR, 108 KVM_VGIC_ITS_ADDR_TYPE, s->dev_fd, 0); 109 110 gicv3_add_its(s->gicv3, dev); 111 112 gicv3_its_init_mmio(s, NULL, NULL); 113 114 if (!kvm_device_check_attr(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, 115 GITS_CTLR)) { 116 error_setg(&s->migration_blocker, "This operating system kernel " 117 "does not support vITS migration"); 118 if (migrate_add_blocker(&s->migration_blocker, errp) < 0) { 119 return; 120 } 121 } else { 122 qemu_add_vm_change_state_handler(vm_change_state_handler, s); 123 } 124 125 kvm_msi_use_devid = true; 126 kvm_gsi_direct_mapping = false; 127 kvm_msi_via_irqfd_allowed = true; 128 } 129 130 /** 131 * kvm_arm_its_pre_save - handles the saving of ITS registers. 132 * ITS tables are flushed into guest RAM separately and earlier, 133 * through the VM change state handler, since at the moment pre_save() 134 * is called, the guest RAM has already been saved. 135 */ 136 static void kvm_arm_its_pre_save(GICv3ITSState *s) 137 { 138 int i; 139 140 for (i = 0; i < 8; i++) { 141 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, 142 GITS_BASER + i * 8, &s->baser[i], false, 143 &error_abort); 144 } 145 146 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, 147 GITS_CTLR, &s->ctlr, false, &error_abort); 148 149 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, 150 GITS_CBASER, &s->cbaser, false, &error_abort); 151 152 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, 153 GITS_CREADR, &s->creadr, false, &error_abort); 154 155 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, 156 GITS_CWRITER, &s->cwriter, false, &error_abort); 157 158 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, 159 GITS_IIDR, &s->iidr, false, &error_abort); 160 } 161 162 /** 163 * kvm_arm_its_post_load - Restore both the ITS registers and tables 164 */ 165 static void kvm_arm_its_post_load(GICv3ITSState *s) 166 { 167 int i; 168 169 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, 170 GITS_IIDR, &s->iidr, true, &error_abort); 171 172 /* 173 * must be written before GITS_CREADR since GITS_CBASER write 174 * access resets GITS_CREADR. 175 */ 176 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, 177 GITS_CBASER, &s->cbaser, true, &error_abort); 178 179 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, 180 GITS_CREADR, &s->creadr, true, &error_abort); 181 182 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, 183 GITS_CWRITER, &s->cwriter, true, &error_abort); 184 185 186 for (i = 0; i < 8; i++) { 187 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, 188 GITS_BASER + i * 8, &s->baser[i], true, 189 &error_abort); 190 } 191 192 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL, 193 KVM_DEV_ARM_ITS_RESTORE_TABLES, NULL, true, 194 &error_abort); 195 196 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, 197 GITS_CTLR, &s->ctlr, true, &error_abort); 198 } 199 200 static void kvm_arm_its_reset_hold(Object *obj) 201 { 202 GICv3ITSState *s = ARM_GICV3_ITS_COMMON(obj); 203 KVMARMITSClass *c = KVM_ARM_ITS_GET_CLASS(s); 204 int i; 205 206 if (c->parent_phases.hold) { 207 c->parent_phases.hold(obj); 208 } 209 210 if (kvm_device_check_attr(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL, 211 KVM_DEV_ARM_ITS_CTRL_RESET)) { 212 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL, 213 KVM_DEV_ARM_ITS_CTRL_RESET, NULL, true, &error_abort); 214 return; 215 } 216 217 warn_report("ITS KVM: full reset is not supported by the host kernel"); 218 219 if (!kvm_device_check_attr(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, 220 GITS_CTLR)) { 221 return; 222 } 223 224 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, 225 GITS_CTLR, &s->ctlr, true, &error_abort); 226 227 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, 228 GITS_CBASER, &s->cbaser, true, &error_abort); 229 230 for (i = 0; i < 8; i++) { 231 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, 232 GITS_BASER + i * 8, &s->baser[i], true, 233 &error_abort); 234 } 235 } 236 237 static Property kvm_arm_its_props[] = { 238 DEFINE_PROP_LINK("parent-gicv3", GICv3ITSState, gicv3, "kvm-arm-gicv3", 239 GICv3State *), 240 DEFINE_PROP_END_OF_LIST(), 241 }; 242 243 static void kvm_arm_its_class_init(ObjectClass *klass, void *data) 244 { 245 DeviceClass *dc = DEVICE_CLASS(klass); 246 ResettableClass *rc = RESETTABLE_CLASS(klass); 247 GICv3ITSCommonClass *icc = ARM_GICV3_ITS_COMMON_CLASS(klass); 248 KVMARMITSClass *ic = KVM_ARM_ITS_CLASS(klass); 249 250 dc->realize = kvm_arm_its_realize; 251 device_class_set_props(dc, kvm_arm_its_props); 252 resettable_class_set_parent_phases(rc, NULL, kvm_arm_its_reset_hold, NULL, 253 &ic->parent_phases); 254 icc->send_msi = kvm_its_send_msi; 255 icc->pre_save = kvm_arm_its_pre_save; 256 icc->post_load = kvm_arm_its_post_load; 257 } 258 259 static const TypeInfo kvm_arm_its_info = { 260 .name = TYPE_KVM_ARM_ITS, 261 .parent = TYPE_ARM_GICV3_ITS_COMMON, 262 .instance_size = sizeof(GICv3ITSState), 263 .class_init = kvm_arm_its_class_init, 264 .class_size = sizeof(KVMARMITSClass), 265 }; 266 267 static void kvm_arm_its_register_types(void) 268 { 269 type_register_static(&kvm_arm_its_info); 270 } 271 272 type_init(kvm_arm_its_register_types) 273