LXR qemu/hw/intc/arm_gicv3_its

   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
  37typedef struct KVMARMITSClass {
  38    GICv3ITSCommonClass parent_class;
  39    void (*parent_reset)(DeviceState *dev);
  40} KVMARMITSClass;
  41
  42
  43static 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 */
  73static 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
  90static 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 */
 136static 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 */
 165static 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
 200static 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
 235static 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
 241static 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
 255static 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
 263static void kvm_arm_its_register_types(void)
 264{
 265    type_register_static(&kvm_arm_its_info);
 266}
 267
 268type_init(kvm_arm_its_register_types)
 269