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 2.1 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 #include "qom/object.h"
  31
  32 #define TYPE_KVM_ARM_ITS "arm-its-kvm"
  33 typedef struct KVMARMITSClass KVMARMITSClass;
  34 /* This is reusing the GICv3ITSState typedef from ARM_GICV3_ITS_COMMON */
  35 DECLARE_OBJ_CHECKERS(GICv3ITSState, KVMARMITSClass,
  36                      KVM_ARM_ITS, TYPE_KVM_ARM_ITS)
  37
  38 struct KVMARMITSClass {
  39     GICv3ITSCommonClass parent_class;
  40     ResettablePhases parent_phases;
  41 };
  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, bool 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_add_its(s->gicv3, dev);
 110
 111     gicv3_its_init_mmio(s, NULL, NULL);
 112
 113     if (!kvm_device_check_attr(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 114         GITS_CTLR)) {
 115         error_setg(&s->migration_blocker, "This operating system kernel "
 116                    "does not support vITS migration");
 117         if (migrate_add_blocker(s->migration_blocker, errp) < 0) {
 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_hold(Object *obj)
 201 {
 202     GICv3ITSState *s = ARM_GICV3_ITS_COMMON(obj);
 203     KVMARMITSClass *c = KVM_ARM_ITS_GET_CLASS(s);
 204     int i;
 205
 206     if (c->parent_phases.hold) {
 207         c->parent_phases.hold(obj);
 208     }
 209
 210     if (kvm_device_check_attr(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
 211                                KVM_DEV_ARM_ITS_CTRL_RESET)) {
 212         kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
 213                           KVM_DEV_ARM_ITS_CTRL_RESET, NULL, true, &error_abort);
 214         return;
 215     }
 216
 217     warn_report("ITS KVM: full reset is not supported by the host kernel");
 218
 219     if (!kvm_device_check_attr(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 220                                GITS_CTLR)) {
 221         return;
 222     }
 223
 224     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 225                       GITS_CTLR, &s->ctlr, true, &error_abort);
 226
 227     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 228                       GITS_CBASER, &s->cbaser, true, &error_abort);
 229
 230     for (i = 0; i < 8; i++) {
 231         kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 232                           GITS_BASER + i * 8, &s->baser[i], true,
 233                           &error_abort);
 234     }
 235 }
 236
 237 static Property kvm_arm_its_props[] = {
 238     DEFINE_PROP_LINK("parent-gicv3", GICv3ITSState, gicv3, "kvm-arm-gicv3",
 239                      GICv3State *),
 240     DEFINE_PROP_END_OF_LIST(),
 241 };
 242
 243 static void kvm_arm_its_class_init(ObjectClass *klass, void *data)
 244 {
 245     DeviceClass *dc = DEVICE_CLASS(klass);
 246     ResettableClass *rc = RESETTABLE_CLASS(klass);
 247     GICv3ITSCommonClass *icc = ARM_GICV3_ITS_COMMON_CLASS(klass);
 248     KVMARMITSClass *ic = KVM_ARM_ITS_CLASS(klass);
 249
 250     dc->realize = kvm_arm_its_realize;
 251     device_class_set_props(dc, kvm_arm_its_props);
 252     resettable_class_set_parent_phases(rc, NULL, kvm_arm_its_reset_hold, NULL,
 253                                        &ic->parent_phases);
 254     icc->send_msi = kvm_its_send_msi;
 255     icc->pre_save = kvm_arm_its_pre_save;
 256     icc->post_load = kvm_arm_its_post_load;
 257 }
 258
 259 static const TypeInfo kvm_arm_its_info = {
 260     .name = TYPE_KVM_ARM_ITS,
 261     .parent = TYPE_ARM_GICV3_ITS_COMMON,
 262     .instance_size = sizeof(GICv3ITSState),
 263     .class_init = kvm_arm_its_class_init,
 264     .class_size = sizeof(KVMARMITSClass),
 265 };
 266
 267 static void kvm_arm_its_register_types(void)
 268 {
 269     type_register_static(&kvm_arm_its_info);
 270 }
 271
 272 type_init(kvm_arm_its_register_types)