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 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 "hw/intc/arm_gicv3_its_common.h" 25 #include "sysemu/sysemu.h" 26 #include "sysemu/kvm.h" 27 #include "kvm_arm.h" 28 #include "migration/blocker.h" 29 30 #define TYPE_KVM_ARM_ITS "arm-its-kvm" 31 #define KVM_ARM_ITS(obj) OBJECT_CHECK(GICv3ITSState, (obj), TYPE_KVM_ARM_ITS) 32 #define KVM_ARM_ITS_CLASS(klass) \ 33 OBJECT_CLASS_CHECK(KVMARMITSClass, (klass), TYPE_KVM_ARM_ITS) 34 #define KVM_ARM_ITS_GET_CLASS(obj) \ 35 OBJECT_GET_CLASS(KVMARMITSClass, (obj), TYPE_KVM_ARM_ITS) 36 37 typedef struct KVMARMITSClass { 38 GICv3ITSCommonClass parent_class; 39 void (*parent_reset)(DeviceState *dev); 40 } KVMARMITSClass; 41 42 43 static int kvm_its_send_msi(GICv3ITSState *s, uint32_t value, uint16_t devid) 44 { 45 struct kvm_msi msi; 46 47 if (unlikely(!s->translater_gpa_known)) { 48 MemoryRegion *mr = &s->iomem_its_translation; 49 MemoryRegionSection mrs; 50 51 mrs = memory_region_find(mr, 0, 1); 52 memory_region_unref(mrs.mr); 53 s->gits_translater_gpa = mrs.offset_within_address_space + 0x40; 54 s->translater_gpa_known = true; 55 } 56 57 msi.address_lo = extract64(s->gits_translater_gpa, 0, 32); 58 msi.address_hi = extract64(s->gits_translater_gpa, 32, 32); 59 msi.data = le32_to_cpu(value); 60 msi.flags = KVM_MSI_VALID_DEVID; 61 msi.devid = devid; 62 memset(msi.pad, 0, sizeof(msi.pad)); 63 64 return kvm_vm_ioctl(kvm_state, KVM_SIGNAL_MSI, &msi); 65 } 66 67 /** 68 * vm_change_state_handler - VM change state callback aiming at flushing 69 * ITS tables into guest RAM 70 * 71 * The tables get flushed to guest RAM whenever the VM gets stopped. 72 */ 73 static void vm_change_state_handler(void *opaque, int running, 74 RunState state) 75 { 76 GICv3ITSState *s = (GICv3ITSState *)opaque; 77 Error *err = NULL; 78 79 if (running) { 80 return; 81 } 82 83 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL, 84 KVM_DEV_ARM_ITS_SAVE_TABLES, NULL, true, &err); 85 if (err) { 86 error_report_err(err); 87 } 88 } 89 90 static void kvm_arm_its_realize(DeviceState *dev, Error **errp) 91 { 92 GICv3ITSState *s = ARM_GICV3_ITS_COMMON(dev); 93 Error *local_err = NULL; 94 95 s->dev_fd = kvm_create_device(kvm_state, KVM_DEV_TYPE_ARM_VGIC_ITS, false); 96 if (s->dev_fd < 0) { 97 error_setg_errno(errp, -s->dev_fd, "error creating in-kernel ITS"); 98 return; 99 } 100 101 /* explicit init of the ITS */ 102 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL, 103 KVM_DEV_ARM_VGIC_CTRL_INIT, NULL, true, &error_abort); 104 105 /* register the base address */ 106 kvm_arm_register_device(&s->iomem_its_cntrl, -1, KVM_DEV_ARM_VGIC_GRP_ADDR, 107 KVM_VGIC_ITS_ADDR_TYPE, s->dev_fd, 0); 108 109 gicv3_its_init_mmio(s, NULL); 110 111 if (!kvm_device_check_attr(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, 112 GITS_CTLR)) { 113 error_setg(&s->migration_blocker, "This operating system kernel " 114 "does not support vITS migration"); 115 migrate_add_blocker(s->migration_blocker, &local_err); 116 if (local_err) { 117 error_propagate(errp, local_err); 118 error_free(s->migration_blocker); 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 = kvm_irqfds_enabled(); 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(DeviceState *dev) 201 { 202 GICv3ITSState *s = ARM_GICV3_ITS_COMMON(dev); 203 KVMARMITSClass *c = KVM_ARM_ITS_GET_CLASS(s); 204 int i; 205 206 c->parent_reset(dev); 207 208 if (kvm_device_check_attr(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL, 209 KVM_DEV_ARM_ITS_CTRL_RESET)) { 210 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL, 211 KVM_DEV_ARM_ITS_CTRL_RESET, NULL, true, &error_abort); 212 return; 213 } 214 215 warn_report("ITS KVM: full reset is not supported by the host kernel"); 216 217 if (!kvm_device_check_attr(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, 218 GITS_CTLR)) { 219 return; 220 } 221 222 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, 223 GITS_CTLR, &s->ctlr, true, &error_abort); 224 225 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, 226 GITS_CBASER, &s->cbaser, true, &error_abort); 227 228 for (i = 0; i < 8; i++) { 229 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, 230 GITS_BASER + i * 8, &s->baser[i], true, 231 &error_abort); 232 } 233 } 234 235 static Property kvm_arm_its_props[] = { 236 DEFINE_PROP_LINK("parent-gicv3", GICv3ITSState, gicv3, "kvm-arm-gicv3", 237 GICv3State *), 238 DEFINE_PROP_END_OF_LIST(), 239 }; 240 241 static void kvm_arm_its_class_init(ObjectClass *klass, void *data) 242 { 243 DeviceClass *dc = DEVICE_CLASS(klass); 244 GICv3ITSCommonClass *icc = ARM_GICV3_ITS_COMMON_CLASS(klass); 245 KVMARMITSClass *ic = KVM_ARM_ITS_CLASS(klass); 246 247 dc->realize = kvm_arm_its_realize; 248 dc->props = kvm_arm_its_props; 249 device_class_set_parent_reset(dc, kvm_arm_its_reset, &ic->parent_reset); 250 icc->send_msi = kvm_its_send_msi; 251 icc->pre_save = kvm_arm_its_pre_save; 252 icc->post_load = kvm_arm_its_post_load; 253 } 254 255 static const TypeInfo kvm_arm_its_info = { 256 .name = TYPE_KVM_ARM_ITS, 257 .parent = TYPE_ARM_GICV3_ITS_COMMON, 258 .instance_size = sizeof(GICv3ITSState), 259 .class_init = kvm_arm_its_class_init, 260 .class_size = sizeof(KVMARMITSClass), 261 }; 262 263 static void kvm_arm_its_register_types(void) 264 { 265 type_register_static(&kvm_arm_its_info); 266 } 267 268 type_init(kvm_arm_its_register_types) 269