hw/intc/arm_gicv3_its_kvm.c

   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 "hw/qdev-properties.h"
  26 #include "sysemu/runstate.h"
  27 #include "sysemu/kvm.h"
  28 #include "kvm_arm.h"
  29 #include "migration/blocker.h"
  30
  31 #define TYPE_KVM_ARM_ITS "arm-its-kvm"
  32 #define KVM_ARM_ITS(obj) OBJECT_CHECK(GICv3ITSState, (obj), TYPE_KVM_ARM_ITS)
  33 #define KVM_ARM_ITS_CLASS(klass) \
  34      OBJECT_CLASS_CHECK(KVMARMITSClass, (klass), TYPE_KVM_ARM_ITS)
  35 #define KVM_ARM_ITS_GET_CLASS(obj) \
  36      OBJECT_GET_CLASS(KVMARMITSClass, (obj), TYPE_KVM_ARM_ITS)
  37
  38 typedef struct KVMARMITSClass {
  39     GICv3ITSCommonClass parent_class;
  40     void (*parent_reset)(DeviceState *dev);
  41 } KVMARMITSClass;
  42
  43
  44 static int kvm_its_send_msi(GICv3ITSState *s, uint32_t value, uint16_t devid)
  45 {
  46     struct kvm_msi msi;
  47
  48     if (unlikely(!s->translater_gpa_known)) {
  49         MemoryRegion *mr = &s->iomem_its_translation;
  50         MemoryRegionSection mrs;
  51
  52         mrs = memory_region_find(mr, 0, 1);
  53         memory_region_unref(mrs.mr);
  54         s->gits_translater_gpa = mrs.offset_within_address_space + 0x40;
  55         s->translater_gpa_known = true;
  56     }
  57
  58     msi.address_lo = extract64(s->gits_translater_gpa, 0, 32);
  59     msi.address_hi = extract64(s->gits_translater_gpa, 32, 32);
  60     msi.data = le32_to_cpu(value);
  61     msi.flags = KVM_MSI_VALID_DEVID;
  62     msi.devid = devid;
  63     memset(msi.pad, 0, sizeof(msi.pad));
  64
  65     return kvm_vm_ioctl(kvm_state, KVM_SIGNAL_MSI, &msi);
  66 }
  67
  68 /**
  69  * vm_change_state_handler - VM change state callback aiming at flushing
  70  * ITS tables into guest RAM
  71  *
  72  * The tables get flushed to guest RAM whenever the VM gets stopped.
  73  */
  74 static void vm_change_state_handler(void *opaque, int running,
  75                                     RunState state)
  76 {
  77     GICv3ITSState *s = (GICv3ITSState *)opaque;
  78     Error *err = NULL;
  79
  80     if (running) {
  81         return;
  82     }
  83
  84     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
  85                       KVM_DEV_ARM_ITS_SAVE_TABLES, NULL, true, &err);
  86     if (err) {
  87         error_report_err(err);
  88     }
  89 }
  90
  91 static void kvm_arm_its_realize(DeviceState *dev, Error **errp)
  92 {
  93     GICv3ITSState *s = ARM_GICV3_ITS_COMMON(dev);
  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         if (migrate_add_blocker(s->migration_blocker, errp) < 0) {
 116             error_free(s->migration_blocker);
 117             return;
 118         }
 119     } else {
 120         qemu_add_vm_change_state_handler(vm_change_state_handler, s);
 121     }
 122
 123     kvm_msi_use_devid = true;
 124     kvm_gsi_direct_mapping = false;
 125     kvm_msi_via_irqfd_allowed = kvm_irqfds_enabled();
 126 }
 127
 128 /**
 129  * kvm_arm_its_pre_save - handles the saving of ITS registers.
 130  * ITS tables are flushed into guest RAM separately and earlier,
 131  * through the VM change state handler, since at the moment pre_save()
 132  * is called, the guest RAM has already been saved.
 133  */
 134 static void kvm_arm_its_pre_save(GICv3ITSState *s)
 135 {
 136     int i;
 137
 138     for (i = 0; i < 8; i++) {
 139         kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 140                           GITS_BASER + i * 8, &s->baser[i], false,
 141                           &error_abort);
 142     }
 143
 144     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 145                       GITS_CTLR, &s->ctlr, false, &error_abort);
 146
 147     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 148                       GITS_CBASER, &s->cbaser, false, &error_abort);
 149
 150     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 151                       GITS_CREADR, &s->creadr, false, &error_abort);
 152
 153     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 154                       GITS_CWRITER, &s->cwriter, false, &error_abort);
 155
 156     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 157                       GITS_IIDR, &s->iidr, false, &error_abort);
 158 }
 159
 160 /**
 161  * kvm_arm_its_post_load - Restore both the ITS registers and tables
 162  */
 163 static void kvm_arm_its_post_load(GICv3ITSState *s)
 164 {
 165     int i;
 166
 167     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 168                       GITS_IIDR, &s->iidr, true, &error_abort);
 169
 170     /*
 171      * must be written before GITS_CREADR since GITS_CBASER write
 172      * access resets GITS_CREADR.
 173      */
 174     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 175                       GITS_CBASER, &s->cbaser, true, &error_abort);
 176
 177     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 178                       GITS_CREADR, &s->creadr, true, &error_abort);
 179
 180     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 181                       GITS_CWRITER, &s->cwriter, true, &error_abort);
 182
 183
 184     for (i = 0; i < 8; i++) {
 185         kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 186                           GITS_BASER + i * 8, &s->baser[i], true,
 187                           &error_abort);
 188     }
 189
 190     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
 191                       KVM_DEV_ARM_ITS_RESTORE_TABLES, NULL, true,
 192                       &error_abort);
 193
 194     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 195                       GITS_CTLR, &s->ctlr, true, &error_abort);
 196 }
 197
 198 static void kvm_arm_its_reset(DeviceState *dev)
 199 {
 200     GICv3ITSState *s = ARM_GICV3_ITS_COMMON(dev);
 201     KVMARMITSClass *c = KVM_ARM_ITS_GET_CLASS(s);
 202     int i;
 203
 204     c->parent_reset(dev);
 205
 206     if (kvm_device_check_attr(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
 207                                KVM_DEV_ARM_ITS_CTRL_RESET)) {
 208         kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
 209                           KVM_DEV_ARM_ITS_CTRL_RESET, NULL, true, &error_abort);
 210         return;
 211     }
 212
 213     warn_report("ITS KVM: full reset is not supported by the host kernel");
 214
 215     if (!kvm_device_check_attr(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 216                                GITS_CTLR)) {
 217         return;
 218     }
 219
 220     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 221                       GITS_CTLR, &s->ctlr, true, &error_abort);
 222
 223     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 224                       GITS_CBASER, &s->cbaser, true, &error_abort);
 225
 226     for (i = 0; i < 8; i++) {
 227         kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 228                           GITS_BASER + i * 8, &s->baser[i], true,
 229                           &error_abort);
 230     }
 231 }
 232
 233 static Property kvm_arm_its_props[] = {
 234     DEFINE_PROP_LINK("parent-gicv3", GICv3ITSState, gicv3, "kvm-arm-gicv3",
 235                      GICv3State *),
 236     DEFINE_PROP_END_OF_LIST(),
 237 };
 238
 239 static void kvm_arm_its_class_init(ObjectClass *klass, void *data)
 240 {
 241     DeviceClass *dc = DEVICE_CLASS(klass);
 242     GICv3ITSCommonClass *icc = ARM_GICV3_ITS_COMMON_CLASS(klass);
 243     KVMARMITSClass *ic = KVM_ARM_ITS_CLASS(klass);
 244
 245     dc->realize = kvm_arm_its_realize;
 246     device_class_set_props(dc, kvm_arm_its_props);
 247     device_class_set_parent_reset(dc, kvm_arm_its_reset, &ic->parent_reset);
 248     icc->send_msi = kvm_its_send_msi;
 249     icc->pre_save = kvm_arm_its_pre_save;
 250     icc->post_load = kvm_arm_its_post_load;
 251 }
 252
 253 static const TypeInfo kvm_arm_its_info = {
 254     .name = TYPE_KVM_ARM_ITS,
 255     .parent = TYPE_ARM_GICV3_ITS_COMMON,
 256     .instance_size = sizeof(GICv3ITSState),
 257     .class_init = kvm_arm_its_class_init,
 258     .class_size = sizeof(KVMARMITSClass),
 259 };
 260
 261 static void kvm_arm_its_register_types(void)
 262 {
 263     type_register_static(&kvm_arm_its_info);
 264 }
 265
 266 type_init(kvm_arm_its_register_types)