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 #define KVM_ARM_ITS_CLASS(klass) \
  32      OBJECT_CLASS_CHECK(KVMARMITSClass, (klass), TYPE_KVM_ARM_ITS)
  33 #define KVM_ARM_ITS_GET_CLASS(obj) \
  34      OBJECT_GET_CLASS(KVMARMITSClass, (obj), TYPE_KVM_ARM_ITS)
  35
  36 typedef struct KVMARMITSClass {
  37     GICv3ITSCommonClass parent_class;
  38     void (*parent_reset)(DeviceState *dev);
  39 } KVMARMITSClass;
  40
  41
  42 static int kvm_its_send_msi(GICv3ITSState *s, uint32_t value, uint16_t devid)
  43 {
  44     struct kvm_msi msi;
  45
  46     if (unlikely(!s->translater_gpa_known)) {
  47         MemoryRegion *mr = &s->iomem_its_translation;
  48         MemoryRegionSection mrs;
  49
  50         mrs = memory_region_find(mr, 0, 1);
  51         memory_region_unref(mrs.mr);
  52         s->gits_translater_gpa = mrs.offset_within_address_space + 0x40;
  53         s->translater_gpa_known = true;
  54     }
  55
  56     msi.address_lo = extract64(s->gits_translater_gpa, 0, 32);
  57     msi.address_hi = extract64(s->gits_translater_gpa, 32, 32);
  58     msi.data = le32_to_cpu(value);
  59     msi.flags = KVM_MSI_VALID_DEVID;
  60     msi.devid = devid;
  61     memset(msi.pad, 0, sizeof(msi.pad));
  62
  63     return kvm_vm_ioctl(kvm_state, KVM_SIGNAL_MSI, &msi);
  64 }
  65
  66 /**
  67  * vm_change_state_handler - VM change state callback aiming at flushing
  68  * ITS tables into guest RAM
  69  *
  70  * The tables get flushed to guest RAM whenever the VM gets stopped.
  71  */
  72 static void vm_change_state_handler(void *opaque, int running,
  73                                     RunState state)
  74 {
  75     GICv3ITSState *s = (GICv3ITSState *)opaque;
  76     Error *err = NULL;
  77
  78     if (running) {
  79         return;
  80     }
  81
  82     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
  83                       KVM_DEV_ARM_ITS_SAVE_TABLES, NULL, true, &err);
  84     if (err) {
  85         error_report_err(err);
  86     }
  87 }
  88
  89 static void kvm_arm_its_realize(DeviceState *dev, Error **errp)
  90 {
  91     GICv3ITSState *s = ARM_GICV3_ITS_COMMON(dev);
  92     Error *local_err = NULL;
  93
  94     s->dev_fd = kvm_create_device(kvm_state, KVM_DEV_TYPE_ARM_VGIC_ITS, false);
  95     if (s->dev_fd < 0) {
  96         error_setg_errno(errp, -s->dev_fd, "error creating in-kernel ITS");
  97         return;
  98     }
  99
 100     /* explicit init of the ITS */
 101     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
 102                       KVM_DEV_ARM_VGIC_CTRL_INIT, NULL, true, &error_abort);
 103
 104     /* register the base address */
 105     kvm_arm_register_device(&s->iomem_its_cntrl, -1, KVM_DEV_ARM_VGIC_GRP_ADDR,
 106                             KVM_VGIC_ITS_ADDR_TYPE, s->dev_fd);
 107
 108     gicv3_its_init_mmio(s, NULL);
 109
 110     if (!kvm_device_check_attr(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 111         GITS_CTLR)) {
 112         error_setg(&s->migration_blocker, "This operating system kernel "
 113                    "does not support vITS migration");
 114         migrate_add_blocker(s->migration_blocker, &local_err);
 115         if (local_err) {
 116             error_propagate(errp, local_err);
 117             error_free(s->migration_blocker);
 118             return;
 119         }
 120     } else {
 121         qemu_add_vm_change_state_handler(vm_change_state_handler, s);
 122     }
 123
 124     kvm_msi_use_devid = true;
 125     kvm_gsi_direct_mapping = false;
 126     kvm_msi_via_irqfd_allowed = kvm_irqfds_enabled();
 127 }
 128
 129 /**
 130  * kvm_arm_its_pre_save - handles the saving of ITS registers.
 131  * ITS tables are flushed into guest RAM separately and earlier,
 132  * through the VM change state handler, since at the moment pre_save()
 133  * is called, the guest RAM has already been saved.
 134  */
 135 static void kvm_arm_its_pre_save(GICv3ITSState *s)
 136 {
 137     int i;
 138
 139     for (i = 0; i < 8; i++) {
 140         kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 141                           GITS_BASER + i * 8, &s->baser[i], false,
 142                           &error_abort);
 143     }
 144
 145     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 146                       GITS_CTLR, &s->ctlr, false, &error_abort);
 147
 148     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 149                       GITS_CBASER, &s->cbaser, false, &error_abort);
 150
 151     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 152                       GITS_CREADR, &s->creadr, false, &error_abort);
 153
 154     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 155                       GITS_CWRITER, &s->cwriter, false, &error_abort);
 156
 157     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 158                       GITS_IIDR, &s->iidr, false, &error_abort);
 159 }
 160
 161 /**
 162  * kvm_arm_its_post_load - Restore both the ITS registers and tables
 163  */
 164 static void kvm_arm_its_post_load(GICv3ITSState *s)
 165 {
 166     int i;
 167
 168     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 169                       GITS_IIDR, &s->iidr, true, &error_abort);
 170
 171     /*
 172      * must be written before GITS_CREADR since GITS_CBASER write
 173      * access resets GITS_CREADR.
 174      */
 175     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 176                       GITS_CBASER, &s->cbaser, true, &error_abort);
 177
 178     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 179                       GITS_CREADR, &s->creadr, true, &error_abort);
 180
 181     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 182                       GITS_CWRITER, &s->cwriter, true, &error_abort);
 183
 184
 185     for (i = 0; i < 8; i++) {
 186         kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 187                           GITS_BASER + i * 8, &s->baser[i], true,
 188                           &error_abort);
 189     }
 190
 191     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
 192                       KVM_DEV_ARM_ITS_RESTORE_TABLES, NULL, true,
 193                       &error_abort);
 194
 195     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 196                       GITS_CTLR, &s->ctlr, true, &error_abort);
 197 }
 198
 199 static void kvm_arm_its_reset(DeviceState *dev)
 200 {
 201     GICv3ITSState *s = ARM_GICV3_ITS_COMMON(dev);
 202     KVMARMITSClass *c = KVM_ARM_ITS_GET_CLASS(s);
 203     int i;
 204
 205     c->parent_reset(dev);
 206
 207     if (kvm_device_check_attr(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
 208                                KVM_DEV_ARM_ITS_CTRL_RESET)) {
 209         kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
 210                           KVM_DEV_ARM_ITS_CTRL_RESET, NULL, true, &error_abort);
 211         return;
 212     }
 213
 214     error_report("ITS KVM: full reset is not supported by the host kernel");
 215
 216     if (!kvm_device_check_attr(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 217                                GITS_CTLR)) {
 218         return;
 219     }
 220
 221     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 222                       GITS_CTLR, &s->ctlr, true, &error_abort);
 223
 224     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 225                       GITS_CBASER, &s->cbaser, true, &error_abort);
 226
 227     for (i = 0; i < 8; i++) {
 228         kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
 229                           GITS_BASER + i * 8, &s->baser[i], true,
 230                           &error_abort);
 231     }
 232 }
 233
 234 static Property kvm_arm_its_props[] = {
 235     DEFINE_PROP_LINK("parent-gicv3", GICv3ITSState, gicv3, "kvm-arm-gicv3",
 236                      GICv3State *),
 237     DEFINE_PROP_END_OF_LIST(),
 238 };
 239
 240 static void kvm_arm_its_class_init(ObjectClass *klass, void *data)
 241 {
 242     DeviceClass *dc = DEVICE_CLASS(klass);
 243     GICv3ITSCommonClass *icc = ARM_GICV3_ITS_COMMON_CLASS(klass);
 244     KVMARMITSClass *ic = KVM_ARM_ITS_CLASS(klass);
 245
 246     dc->realize = kvm_arm_its_realize;
 247     dc->props   = kvm_arm_its_props;
 248     device_class_set_parent_reset(dc, kvm_arm_its_reset, &ic->parent_reset);
 249     icc->send_msi = kvm_its_send_msi;
 250     icc->pre_save = kvm_arm_its_pre_save;
 251     icc->post_load = kvm_arm_its_post_load;
 252 }
 253
 254 static const TypeInfo kvm_arm_its_info = {
 255     .name = TYPE_KVM_ARM_ITS,
 256     .parent = TYPE_ARM_GICV3_ITS_COMMON,
 257     .instance_size = sizeof(GICv3ITSState),
 258     .class_init = kvm_arm_its_class_init,
 259     .class_size = sizeof(KVMARMITSClass),
 260 };
 261
 262 static void kvm_arm_its_register_types(void)
 263 {
 264     type_register_static(&kvm_arm_its_info);
 265 }
 266
 267 type_init(kvm_arm_its_register_types)