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 "hw/intc/arm_gicv3_its_common.h" 24 #include "sysemu/sysemu.h" 25 #include "sysemu/kvm.h" 26 #include "kvm_arm.h" 27 #include "migration/blocker.h" 28 29 #define TYPE_KVM_ARM_ITS "arm-its-kvm" 30 #define KVM_ARM_ITS(obj) OBJECT_CHECK(GICv3ITSState, (obj), TYPE_KVM_ARM_ITS) 31 32 static int kvm_its_send_msi(GICv3ITSState *s, uint32_t value, uint16_t devid) 33 { 34 struct kvm_msi msi; 35 36 if (unlikely(!s->translater_gpa_known)) { 37 MemoryRegion *mr = &s->iomem_its_translation; 38 MemoryRegionSection mrs; 39 40 mrs = memory_region_find(mr, 0, 1); 41 memory_region_unref(mrs.mr); 42 s->gits_translater_gpa = mrs.offset_within_address_space + 0x40; 43 s->translater_gpa_known = true; 44 } 45 46 msi.address_lo = extract64(s->gits_translater_gpa, 0, 32); 47 msi.address_hi = extract64(s->gits_translater_gpa, 32, 32); 48 msi.data = le32_to_cpu(value); 49 msi.flags = KVM_MSI_VALID_DEVID; 50 msi.devid = devid; 51 memset(msi.pad, 0, sizeof(msi.pad)); 52 53 return kvm_vm_ioctl(kvm_state, KVM_SIGNAL_MSI, &msi); 54 } 55 56 /** 57 * vm_change_state_handler - VM change state callback aiming at flushing 58 * ITS tables into guest RAM 59 * 60 * The tables get flushed to guest RAM whenever the VM gets stopped. 61 */ 62 static void vm_change_state_handler(void *opaque, int running, 63 RunState state) 64 { 65 GICv3ITSState *s = (GICv3ITSState *)opaque; 66 Error *err = NULL; 67 int ret; 68 69 if (running) { 70 return; 71 } 72 73 ret = kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL, 74 KVM_DEV_ARM_ITS_SAVE_TABLES, NULL, true, &err); 75 if (err) { 76 error_report_err(err); 77 } 78 if (ret < 0 && ret != -EFAULT) { 79 abort(); 80 } 81 } 82 83 static void kvm_arm_its_realize(DeviceState *dev, Error **errp) 84 { 85 GICv3ITSState *s = ARM_GICV3_ITS_COMMON(dev); 86 Error *local_err = NULL; 87 88 s->dev_fd = kvm_create_device(kvm_state, KVM_DEV_TYPE_ARM_VGIC_ITS, false); 89 if (s->dev_fd < 0) { 90 error_setg_errno(errp, -s->dev_fd, "error creating in-kernel ITS"); 91 return; 92 } 93 94 /* explicit init of the ITS */ 95 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL, 96 KVM_DEV_ARM_VGIC_CTRL_INIT, NULL, true, &error_abort); 97 98 /* register the base address */ 99 kvm_arm_register_device(&s->iomem_its_cntrl, -1, KVM_DEV_ARM_VGIC_GRP_ADDR, 100 KVM_VGIC_ITS_ADDR_TYPE, s->dev_fd); 101 102 gicv3_its_init_mmio(s, NULL); 103 104 if (!kvm_device_check_attr(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, 105 GITS_CTLR)) { 106 error_setg(&s->migration_blocker, "This operating system kernel " 107 "does not support vITS migration"); 108 migrate_add_blocker(s->migration_blocker, &local_err); 109 if (local_err) { 110 error_propagate(errp, local_err); 111 error_free(s->migration_blocker); 112 return; 113 } 114 } 115 116 kvm_msi_use_devid = true; 117 kvm_gsi_direct_mapping = false; 118 kvm_msi_via_irqfd_allowed = kvm_irqfds_enabled(); 119 120 qemu_add_vm_change_state_handler(vm_change_state_handler, s); 121 } 122 123 /** 124 * kvm_arm_its_pre_save - handles the saving of ITS registers. 125 * ITS tables are flushed into guest RAM separately and earlier, 126 * through the VM change state handler, since at the moment pre_save() 127 * is called, the guest RAM has already been saved. 128 */ 129 static void kvm_arm_its_pre_save(GICv3ITSState *s) 130 { 131 int i; 132 133 for (i = 0; i < 8; i++) { 134 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, 135 GITS_BASER + i * 8, &s->baser[i], false, 136 &error_abort); 137 } 138 139 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, 140 GITS_CTLR, &s->ctlr, false, &error_abort); 141 142 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, 143 GITS_CBASER, &s->cbaser, false, &error_abort); 144 145 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, 146 GITS_CREADR, &s->creadr, false, &error_abort); 147 148 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, 149 GITS_CWRITER, &s->cwriter, false, &error_abort); 150 151 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, 152 GITS_IIDR, &s->iidr, false, &error_abort); 153 } 154 155 /** 156 * kvm_arm_its_post_load - Restore both the ITS registers and tables 157 */ 158 static void kvm_arm_its_post_load(GICv3ITSState *s) 159 { 160 int i; 161 162 if (!s->iidr) { 163 return; 164 } 165 166 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, 167 GITS_IIDR, &s->iidr, true, &error_abort); 168 169 /* 170 * must be written before GITS_CREADR since GITS_CBASER write 171 * access resets GITS_CREADR. 172 */ 173 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, 174 GITS_CBASER, &s->cbaser, true, &error_abort); 175 176 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, 177 GITS_CREADR, &s->creadr, true, &error_abort); 178 179 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, 180 GITS_CWRITER, &s->cwriter, true, &error_abort); 181 182 183 for (i = 0; i < 8; i++) { 184 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, 185 GITS_BASER + i * 8, &s->baser[i], true, 186 &error_abort); 187 } 188 189 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL, 190 KVM_DEV_ARM_ITS_RESTORE_TABLES, NULL, true, 191 &error_abort); 192 193 kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, 194 GITS_CTLR, &s->ctlr, true, &error_abort); 195 } 196 197 static Property kvm_arm_its_props[] = { 198 DEFINE_PROP_LINK("parent-gicv3", GICv3ITSState, gicv3, "kvm-arm-gicv3", 199 GICv3State *), 200 DEFINE_PROP_END_OF_LIST(), 201 }; 202 203 static void kvm_arm_its_class_init(ObjectClass *klass, void *data) 204 { 205 DeviceClass *dc = DEVICE_CLASS(klass); 206 GICv3ITSCommonClass *icc = ARM_GICV3_ITS_COMMON_CLASS(klass); 207 208 dc->realize = kvm_arm_its_realize; 209 dc->props = kvm_arm_its_props; 210 icc->send_msi = kvm_its_send_msi; 211 icc->pre_save = kvm_arm_its_pre_save; 212 icc->post_load = kvm_arm_its_post_load; 213 } 214 215 static const TypeInfo kvm_arm_its_info = { 216 .name = TYPE_KVM_ARM_ITS, 217 .parent = TYPE_ARM_GICV3_ITS_COMMON, 218 .instance_size = sizeof(GICv3ITSState), 219 .class_init = kvm_arm_its_class_init, 220 }; 221 222 static void kvm_arm_its_register_types(void) 223 { 224 type_register_static(&kvm_arm_its_info); 225 } 226 227 type_init(kvm_arm_its_register_types) 228