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 /**
 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)