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 "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)