| 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/core/qdev-properties.h" |
| 27 | #include "system/runstate.h" |
| 28 | #include "system/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 = 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, ResetType type) |
| 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, type); |
| 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 const Property kvm_arm_its_props[] = { |
| 238 | DEFINE_PROP_LINK("parent-gicv3", GICv3ITSState, gicv3, "kvm-arm-gicv3", |
| 239 | GICv3State *), |
| 240 | }; |
| 241 | |
| 242 | static void kvm_arm_its_class_init(ObjectClass *klass, const void *data) |
| 243 | { |
| 244 | DeviceClass *dc = DEVICE_CLASS(klass); |
| 245 | ResettableClass *rc = RESETTABLE_CLASS(klass); |
| 246 | GICv3ITSCommonClass *icc = ARM_GICV3_ITS_COMMON_CLASS(klass); |
| 247 | KVMARMITSClass *ic = KVM_ARM_ITS_CLASS(klass); |
| 248 | |
| 249 | dc->realize = kvm_arm_its_realize; |
| 250 | device_class_set_props(dc, kvm_arm_its_props); |
| 251 | resettable_class_set_parent_phases(rc, NULL, kvm_arm_its_reset_hold, NULL, |
| 252 | &ic->parent_phases); |
| 253 | icc->send_msi = kvm_its_send_msi; |
| 254 | icc->pre_save = kvm_arm_its_pre_save; |
| 255 | icc->post_load = kvm_arm_its_post_load; |
| 256 | } |
| 257 | |
| 258 | static const TypeInfo kvm_arm_its_info = { |
| 259 | .name = TYPE_KVM_ARM_ITS, |
| 260 | .parent = TYPE_ARM_GICV3_ITS_COMMON, |
| 261 | .instance_size = sizeof(GICv3ITSState), |
| 262 | .class_init = kvm_arm_its_class_init, |
| 263 | .class_size = sizeof(KVMARMITSClass), |
| 264 | }; |
| 265 | |
| 266 | static void kvm_arm_its_register_types(void) |
| 267 | { |
| 268 | type_register_static(&kvm_arm_its_info); |
| 269 | } |
| 270 | |
| 271 | type_init(kvm_arm_its_register_types) |