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 "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 static void kvm_arm_its_init(Object *obj)
 124 {
 125     GICv3ITSState *s = KVM_ARM_ITS(obj);
 126
 127     object_property_add_link(obj, "parent-gicv3",
 128                              "kvm-arm-gicv3", (Object **)&s->gicv3,
 129                              object_property_allow_set_link,
 130                              OBJ_PROP_LINK_UNREF_ON_RELEASE,
 131                              &error_abort);
 132 }
 133
 134 /**
 135  * kvm_arm_its_pre_save - handles the saving of ITS registers.
 136  * ITS tables are flushed into guest RAM separately and earlier,
 137  * through the VM change state handler, since at the moment pre_save()
 138  * is called, the guest RAM has already been saved.
 139  */
 140 static void kvm_arm_its_pre_save(GICv3ITSState *s)
 141 {
 142     int i;
 143
 144     for (i = 0; i < 8; i++) {
 145         kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 146                           GITS_BASER + i * 8, &s->baser[i], false,
 147                           &error_abort);
 148     }
 149
 150     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 151                       GITS_CTLR, &s->ctlr, false, &error_abort);
 152
 153     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 154                       GITS_CBASER, &s->cbaser, false, &error_abort);
 155
 156     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 157                       GITS_CREADR, &s->creadr, false, &error_abort);
 158
 159     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 160                       GITS_CWRITER, &s->cwriter, false, &error_abort);
 161
 162     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 163                       GITS_IIDR, &s->iidr, false, &error_abort);
 164 }
 165
 166 /**
 167  * kvm_arm_its_post_load - Restore both the ITS registers and tables
 168  */
 169 static void kvm_arm_its_post_load(GICv3ITSState *s)
 170 {
 171     int i;
 172
 173     if (!s->iidr) {
 174         return;
 175     }
 176
 177     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 178                       GITS_IIDR, &s->iidr, true, &error_abort);
 179
 180     /*
 181      * must be written before GITS_CREADR since GITS_CBASER write
 182      * access resets GITS_CREADR.
 183      */
 184     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 185                       GITS_CBASER, &s->cbaser, true, &error_abort);
 186
 187     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 188                       GITS_CREADR, &s->creadr, true, &error_abort);
 189
 190     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 191                       GITS_CWRITER, &s->cwriter, true, &error_abort);
 192
 193
 194     for (i = 0; i < 8; i++) {
 195         kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 196                           GITS_BASER + i * 8, &s->baser[i], true,
 197                           &error_abort);
 198     }
 199
 200     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
 201                       KVM_DEV_ARM_ITS_RESTORE_TABLES, NULL, true,
 202                       &error_abort);
 203
 204     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 205                       GITS_CTLR, &s->ctlr, true, &error_abort);
 206 }
 207
 208 static void kvm_arm_its_class_init(ObjectClass *klass, void *data)
 209 {
 210     DeviceClass *dc = DEVICE_CLASS(klass);
 211     GICv3ITSCommonClass *icc = ARM_GICV3_ITS_COMMON_CLASS(klass);
 212
 213     dc->realize = kvm_arm_its_realize;
 214     icc->send_msi = kvm_its_send_msi;
 215     icc->pre_save = kvm_arm_its_pre_save;
 216     icc->post_load = kvm_arm_its_post_load;
 217 }
 218
 219 static const TypeInfo kvm_arm_its_info = {
 220     .name = TYPE_KVM_ARM_ITS,
 221     .parent = TYPE_ARM_GICV3_ITS_COMMON,
 222     .instance_size = sizeof(GICv3ITSState),
 223     .instance_init = kvm_arm_its_init,
 224     .class_init = kvm_arm_its_class_init,
 225 };
 226
 227 static void kvm_arm_its_register_types(void)
 228 {
 229     type_register_static(&kvm_arm_its_info);
 230 }
 231
 232 type_init(kvm_arm_its_register_types)