arch/arm64/kvm/vgic/vgic-mmio-v2.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * VGICv2 MMIO handling functions
   4  */
   5
   6 #include <linux/irqchip/arm-gic.h>
   7 #include <linux/kvm.h>
   8 #include <linux/kvm_host.h>
   9 #include <linux/nospec.h>
  10
  11 #include <kvm/iodev.h>
  12 #include <kvm/arm_vgic.h>
  13
  14 #include "vgic.h"
  15 #include "vgic-mmio.h"
  16
  17 /*
  18  * The Revision field in the IIDR have the following meanings:
  19  *
  20  * Revision 1: Report GICv2 interrupts as group 0 instead of group 1
  21  * Revision 2: Interrupt groups are guest-configurable and signaled using
  22  *             their configured groups.
  23  */
  24
  25 static unsigned long vgic_mmio_read_v2_misc(struct kvm_vcpu *vcpu,
  26                                             gpa_t addr, unsigned int len)
  27 {
  28         struct vgic_dist *vgic = &vcpu->kvm->arch.vgic;
  29         u32 value;
  30
  31         switch (addr & 0x0c) {
  32         case GIC_DIST_CTRL:
  33                 value = vgic->enabled ? GICD_ENABLE : 0;
  34                 break;
  35         case GIC_DIST_CTR:
  36                 value = vgic->nr_spis + VGIC_NR_PRIVATE_IRQS;
  37                 value = (value >> 5) - 1;
  38                 value |= (atomic_read(&vcpu->kvm->online_vcpus) - 1) << 5;
  39                 break;
  40         case GIC_DIST_IIDR:
  41                 value = (PRODUCT_ID_KVM << GICD_IIDR_PRODUCT_ID_SHIFT) |
  42                         (vgic->implementation_rev << GICD_IIDR_REVISION_SHIFT) |
  43                         (IMPLEMENTER_ARM << GICD_IIDR_IMPLEMENTER_SHIFT);
  44                 break;
  45         default:
  46                 return 0;
  47         }
  48
  49         return value;
  50 }
  51
  52 static void vgic_mmio_write_v2_misc(struct kvm_vcpu *vcpu,
  53                                     gpa_t addr, unsigned int len,
  54                                     unsigned long val)
  55 {
  56         struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
  57         bool was_enabled = dist->enabled;
  58
  59         switch (addr & 0x0c) {
  60         case GIC_DIST_CTRL:
  61                 dist->enabled = val & GICD_ENABLE;
  62                 if (!was_enabled && dist->enabled)
  63                         vgic_kick_vcpus(vcpu->kvm);
  64                 break;
  65         case GIC_DIST_CTR:
  66         case GIC_DIST_IIDR:
  67                 /* Nothing to do */
  68                 return;
  69         }
  70 }
  71
  72 static int vgic_mmio_uaccess_write_v2_misc(struct kvm_vcpu *vcpu,
  73                                            gpa_t addr, unsigned int len,
  74                                            unsigned long val)
  75 {
  76         struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
  77         u32 reg;
  78
  79         switch (addr & 0x0c) {
  80         case GIC_DIST_IIDR:
  81                 reg = vgic_mmio_read_v2_misc(vcpu, addr, len);
  82                 if ((reg ^ val) & ~GICD_IIDR_REVISION_MASK)
  83                         return -EINVAL;
  84
  85                 /*
  86                  * If we observe a write to GICD_IIDR we know that userspace
  87                  * has been updated and has had a chance to cope with older
  88                  * kernels (VGICv2 IIDR.Revision == 0) incorrectly reporting
  89                  * interrupts as group 1, and therefore we now allow groups to
  90                  * be user writable.  Doing this by default would break
  91                  * migration from old kernels to new kernels with legacy
  92                  * userspace.
  93                  */
  94                 reg = FIELD_GET(GICD_IIDR_REVISION_MASK, reg);
  95                 switch (reg) {
  96                 case KVM_VGIC_IMP_REV_2:
  97                 case KVM_VGIC_IMP_REV_3:
  98                         vcpu->kvm->arch.vgic.v2_groups_user_writable = true;
  99                         dist->implementation_rev = reg;
 100                         return 0;
 101                 default:
 102                         return -EINVAL;
 103                 }
 104         }
 105
 106         vgic_mmio_write_v2_misc(vcpu, addr, len, val);
 107         return 0;
 108 }
 109
 110 static int vgic_mmio_uaccess_write_v2_group(struct kvm_vcpu *vcpu,
 111                                             gpa_t addr, unsigned int len,
 112                                             unsigned long val)
 113 {
 114         if (vcpu->kvm->arch.vgic.v2_groups_user_writable)
 115                 vgic_mmio_write_group(vcpu, addr, len, val);
 116
 117         return 0;
 118 }
 119
 120 static void vgic_mmio_write_sgir(struct kvm_vcpu *source_vcpu,
 121                                  gpa_t addr, unsigned int len,
 122                                  unsigned long val)
 123 {
 124         int nr_vcpus = atomic_read(&source_vcpu->kvm->online_vcpus);
 125         int intid = val & 0xf;
 126         int targets = (val >> 16) & 0xff;
 127         int mode = (val >> 24) & 0x03;
 128         struct kvm_vcpu *vcpu;
 129         unsigned long flags, c;
 130
 131         switch (mode) {
 132         case 0x0:               /* as specified by targets */
 133                 break;
 134         case 0x1:
 135                 targets = (1U << nr_vcpus) - 1;                 /* all, ... */
 136                 targets &= ~(1U << source_vcpu->vcpu_id);       /* but self */
 137                 break;
 138         case 0x2:               /* this very vCPU only */
 139                 targets = (1U << source_vcpu->vcpu_id);
 140                 break;
 141         case 0x3:               /* reserved */
 142                 return;
 143         }
 144
 145         kvm_for_each_vcpu(c, vcpu, source_vcpu->kvm) {
 146                 struct vgic_irq *irq;
 147
 148                 if (!(targets & (1U << c)))
 149                         continue;
 150
 151                 irq = vgic_get_irq(source_vcpu->kvm, vcpu, intid);
 152
 153                 raw_spin_lock_irqsave(&irq->irq_lock, flags);
 154                 irq->pending_latch = true;
 155                 irq->source |= 1U << source_vcpu->vcpu_id;
 156
 157                 vgic_queue_irq_unlock(source_vcpu->kvm, irq, flags);
 158                 vgic_put_irq(source_vcpu->kvm, irq);
 159         }
 160 }
 161
 162 static unsigned long vgic_mmio_read_target(struct kvm_vcpu *vcpu,
 163                                            gpa_t addr, unsigned int len)
 164 {
 165         u32 intid = VGIC_ADDR_TO_INTID(addr, 8);
 166         int i;
 167         u64 val = 0;
 168
 169         for (i = 0; i < len; i++) {
 170                 struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
 171
 172                 val |= (u64)irq->targets << (i * 8);
 173
 174                 vgic_put_irq(vcpu->kvm, irq);
 175         }
 176
 177         return val;
 178 }
 179
 180 static void vgic_mmio_write_target(struct kvm_vcpu *vcpu,
 181                                    gpa_t addr, unsigned int len,
 182                                    unsigned long val)
 183 {
 184         u32 intid = VGIC_ADDR_TO_INTID(addr, 8);
 185         u8 cpu_mask = GENMASK(atomic_read(&vcpu->kvm->online_vcpus) - 1, 0);
 186         int i;
 187         unsigned long flags;
 188
 189         /* GICD_ITARGETSR[0-7] are read-only */
 190         if (intid < VGIC_NR_PRIVATE_IRQS)
 191                 return;
 192
 193         for (i = 0; i < len; i++) {
 194                 struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, NULL, intid + i);
 195                 int target;
 196
 197                 raw_spin_lock_irqsave(&irq->irq_lock, flags);
 198
 199                 irq->targets = (val >> (i * 8)) & cpu_mask;
 200                 target = irq->targets ? __ffs(irq->targets) : 0;
 201                 irq->target_vcpu = kvm_get_vcpu(vcpu->kvm, target);
 202
 203                 raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
 204                 vgic_put_irq(vcpu->kvm, irq);
 205         }
 206 }
 207
 208 static unsigned long vgic_mmio_read_sgipend(struct kvm_vcpu *vcpu,
 209                                             gpa_t addr, unsigned int len)
 210 {
 211         u32 intid = addr & 0x0f;
 212         int i;
 213         u64 val = 0;
 214
 215         for (i = 0; i < len; i++) {
 216                 struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
 217
 218                 val |= (u64)irq->source << (i * 8);
 219
 220                 vgic_put_irq(vcpu->kvm, irq);
 221         }
 222         return val;
 223 }
 224
 225 static void vgic_mmio_write_sgipendc(struct kvm_vcpu *vcpu,
 226                                      gpa_t addr, unsigned int len,
 227                                      unsigned long val)
 228 {
 229         u32 intid = addr & 0x0f;
 230         int i;
 231         unsigned long flags;
 232
 233         for (i = 0; i < len; i++) {
 234                 struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
 235
 236                 raw_spin_lock_irqsave(&irq->irq_lock, flags);
 237
 238                 irq->source &= ~((val >> (i * 8)) & 0xff);
 239                 if (!irq->source)
 240                         irq->pending_latch = false;
 241
 242                 raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
 243                 vgic_put_irq(vcpu->kvm, irq);
 244         }
 245 }
 246
 247 static void vgic_mmio_write_sgipends(struct kvm_vcpu *vcpu,
 248                                      gpa_t addr, unsigned int len,
 249                                      unsigned long val)
 250 {
 251         u32 intid = addr & 0x0f;
 252         int i;
 253         unsigned long flags;
 254
 255         for (i = 0; i < len; i++) {
 256                 struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
 257
 258                 raw_spin_lock_irqsave(&irq->irq_lock, flags);
 259
 260                 irq->source |= (val >> (i * 8)) & 0xff;
 261
 262                 if (irq->source) {
 263                         irq->pending_latch = true;
 264                         vgic_queue_irq_unlock(vcpu->kvm, irq, flags);
 265                 } else {
 266                         raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
 267                 }
 268                 vgic_put_irq(vcpu->kvm, irq);
 269         }
 270 }
 271
 272 #define GICC_ARCH_VERSION_V2    0x2
 273
 274 /* These are for userland accesses only, there is no guest-facing emulation. */
 275 static unsigned long vgic_mmio_read_vcpuif(struct kvm_vcpu *vcpu,
 276                                            gpa_t addr, unsigned int len)
 277 {
 278         struct vgic_vmcr vmcr;
 279         u32 val;
 280
 281         vgic_get_vmcr(vcpu, &vmcr);
 282
 283         switch (addr & 0xff) {
 284         case GIC_CPU_CTRL:
 285                 val = vmcr.grpen0 << GIC_CPU_CTRL_EnableGrp0_SHIFT;
 286                 val |= vmcr.grpen1 << GIC_CPU_CTRL_EnableGrp1_SHIFT;
 287                 val |= vmcr.ackctl << GIC_CPU_CTRL_AckCtl_SHIFT;
 288                 val |= vmcr.fiqen << GIC_CPU_CTRL_FIQEn_SHIFT;
 289                 val |= vmcr.cbpr << GIC_CPU_CTRL_CBPR_SHIFT;
 290                 val |= vmcr.eoim << GIC_CPU_CTRL_EOImodeNS_SHIFT;
 291
 292                 break;
 293         case GIC_CPU_PRIMASK:
 294                 /*
 295                  * Our KVM_DEV_TYPE_ARM_VGIC_V2 device ABI exports the
 296                  * PMR field as GICH_VMCR.VMPriMask rather than
 297                  * GICC_PMR.Priority, so we expose the upper five bits of
 298                  * priority mask to userspace using the lower bits in the
 299                  * unsigned long.
 300                  */
 301                 val = (vmcr.pmr & GICV_PMR_PRIORITY_MASK) >>
 302                         GICV_PMR_PRIORITY_SHIFT;
 303                 break;
 304         case GIC_CPU_BINPOINT:
 305                 val = vmcr.bpr;
 306                 break;
 307         case GIC_CPU_ALIAS_BINPOINT:
 308                 val = vmcr.abpr;
 309                 break;
 310         case GIC_CPU_IDENT:
 311                 val = ((PRODUCT_ID_KVM << 20) |
 312                        (GICC_ARCH_VERSION_V2 << 16) |
 313                        IMPLEMENTER_ARM);
 314                 break;
 315         default:
 316                 return 0;
 317         }
 318
 319         return val;
 320 }
 321
 322 static void vgic_mmio_write_vcpuif(struct kvm_vcpu *vcpu,
 323                                    gpa_t addr, unsigned int len,
 324                                    unsigned long val)
 325 {
 326         struct vgic_vmcr vmcr;
 327
 328         vgic_get_vmcr(vcpu, &vmcr);
 329
 330         switch (addr & 0xff) {
 331         case GIC_CPU_CTRL:
 332                 vmcr.grpen0 = !!(val & GIC_CPU_CTRL_EnableGrp0);
 333                 vmcr.grpen1 = !!(val & GIC_CPU_CTRL_EnableGrp1);
 334                 vmcr.ackctl = !!(val & GIC_CPU_CTRL_AckCtl);
 335                 vmcr.fiqen = !!(val & GIC_CPU_CTRL_FIQEn);
 336                 vmcr.cbpr = !!(val & GIC_CPU_CTRL_CBPR);
 337                 vmcr.eoim = !!(val & GIC_CPU_CTRL_EOImodeNS);
 338
 339                 break;
 340         case GIC_CPU_PRIMASK:
 341                 /*
 342                  * Our KVM_DEV_TYPE_ARM_VGIC_V2 device ABI exports the
 343                  * PMR field as GICH_VMCR.VMPriMask rather than
 344                  * GICC_PMR.Priority, so we expose the upper five bits of
 345                  * priority mask to userspace using the lower bits in the
 346                  * unsigned long.
 347                  */
 348                 vmcr.pmr = (val << GICV_PMR_PRIORITY_SHIFT) &
 349                         GICV_PMR_PRIORITY_MASK;
 350                 break;
 351         case GIC_CPU_BINPOINT:
 352                 vmcr.bpr = val;
 353                 break;
 354         case GIC_CPU_ALIAS_BINPOINT:
 355                 vmcr.abpr = val;
 356                 break;
 357         }
 358
 359         vgic_set_vmcr(vcpu, &vmcr);
 360 }
 361
 362 static unsigned long vgic_mmio_read_apr(struct kvm_vcpu *vcpu,
 363                                         gpa_t addr, unsigned int len)
 364 {
 365         int n; /* which APRn is this */
 366
 367         n = (addr >> 2) & 0x3;
 368
 369         if (kvm_vgic_global_state.type == VGIC_V2) {
 370                 /* GICv2 hardware systems support max. 32 groups */
 371                 if (n != 0)
 372                         return 0;
 373                 return vcpu->arch.vgic_cpu.vgic_v2.vgic_apr;
 374         } else {
 375                 struct vgic_v3_cpu_if *vgicv3 = &vcpu->arch.vgic_cpu.vgic_v3;
 376
 377                 if (n > vgic_v3_max_apr_idx(vcpu))
 378                         return 0;
 379
 380                 n = array_index_nospec(n, 4);
 381
 382                 /* GICv3 only uses ICH_AP1Rn for memory mapped (GICv2) guests */
 383                 return vgicv3->vgic_ap1r[n];
 384         }
 385 }
 386
 387 static void vgic_mmio_write_apr(struct kvm_vcpu *vcpu,
 388                                 gpa_t addr, unsigned int len,
 389                                 unsigned long val)
 390 {
 391         int n; /* which APRn is this */
 392
 393         n = (addr >> 2) & 0x3;
 394
 395         if (kvm_vgic_global_state.type == VGIC_V2) {
 396                 /* GICv2 hardware systems support max. 32 groups */
 397                 if (n != 0)
 398                         return;
 399                 vcpu->arch.vgic_cpu.vgic_v2.vgic_apr = val;
 400         } else {
 401                 struct vgic_v3_cpu_if *vgicv3 = &vcpu->arch.vgic_cpu.vgic_v3;
 402
 403                 if (n > vgic_v3_max_apr_idx(vcpu))
 404                         return;
 405
 406                 n = array_index_nospec(n, 4);
 407
 408                 /* GICv3 only uses ICH_AP1Rn for memory mapped (GICv2) guests */
 409                 vgicv3->vgic_ap1r[n] = val;
 410         }
 411 }
 412
 413 static const struct vgic_register_region vgic_v2_dist_registers[] = {
 414         REGISTER_DESC_WITH_LENGTH_UACCESS(GIC_DIST_CTRL,
 415                 vgic_mmio_read_v2_misc, vgic_mmio_write_v2_misc,
 416                 NULL, vgic_mmio_uaccess_write_v2_misc,
 417                 12, VGIC_ACCESS_32bit),
 418         REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_IGROUP,
 419                 vgic_mmio_read_group, vgic_mmio_write_group,
 420                 NULL, vgic_mmio_uaccess_write_v2_group, 1,
 421                 VGIC_ACCESS_32bit),
 422         REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_ENABLE_SET,
 423                 vgic_mmio_read_enable, vgic_mmio_write_senable,
 424                 NULL, vgic_uaccess_write_senable, 1,
 425                 VGIC_ACCESS_32bit),
 426         REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_ENABLE_CLEAR,
 427                 vgic_mmio_read_enable, vgic_mmio_write_cenable,
 428                 NULL, vgic_uaccess_write_cenable, 1,
 429                 VGIC_ACCESS_32bit),
 430         REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_PENDING_SET,
 431                 vgic_mmio_read_pending, vgic_mmio_write_spending,
 432                 NULL, vgic_uaccess_write_spending, 1,
 433                 VGIC_ACCESS_32bit),
 434         REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_PENDING_CLEAR,
 435                 vgic_mmio_read_pending, vgic_mmio_write_cpending,
 436                 NULL, vgic_uaccess_write_cpending, 1,
 437                 VGIC_ACCESS_32bit),
 438         REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_ACTIVE_SET,
 439                 vgic_mmio_read_active, vgic_mmio_write_sactive,
 440                 vgic_uaccess_read_active, vgic_mmio_uaccess_write_sactive, 1,
 441                 VGIC_ACCESS_32bit),
 442         REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_ACTIVE_CLEAR,
 443                 vgic_mmio_read_active, vgic_mmio_write_cactive,
 444                 vgic_uaccess_read_active, vgic_mmio_uaccess_write_cactive, 1,
 445                 VGIC_ACCESS_32bit),
 446         REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_PRI,
 447                 vgic_mmio_read_priority, vgic_mmio_write_priority, NULL, NULL,
 448                 8, VGIC_ACCESS_32bit | VGIC_ACCESS_8bit),
 449         REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_TARGET,
 450                 vgic_mmio_read_target, vgic_mmio_write_target, NULL, NULL, 8,
 451                 VGIC_ACCESS_32bit | VGIC_ACCESS_8bit),
 452         REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_CONFIG,
 453                 vgic_mmio_read_config, vgic_mmio_write_config, NULL, NULL, 2,
 454                 VGIC_ACCESS_32bit),
 455         REGISTER_DESC_WITH_LENGTH(GIC_DIST_SOFTINT,
 456                 vgic_mmio_read_raz, vgic_mmio_write_sgir, 4,
 457                 VGIC_ACCESS_32bit),
 458         REGISTER_DESC_WITH_LENGTH(GIC_DIST_SGI_PENDING_CLEAR,
 459                 vgic_mmio_read_sgipend, vgic_mmio_write_sgipendc, 16,
 460                 VGIC_ACCESS_32bit | VGIC_ACCESS_8bit),
 461         REGISTER_DESC_WITH_LENGTH(GIC_DIST_SGI_PENDING_SET,
 462                 vgic_mmio_read_sgipend, vgic_mmio_write_sgipends, 16,
 463                 VGIC_ACCESS_32bit | VGIC_ACCESS_8bit),
 464 };
 465
 466 static const struct vgic_register_region vgic_v2_cpu_registers[] = {
 467         REGISTER_DESC_WITH_LENGTH(GIC_CPU_CTRL,
 468                 vgic_mmio_read_vcpuif, vgic_mmio_write_vcpuif, 4,
 469                 VGIC_ACCESS_32bit),
 470         REGISTER_DESC_WITH_LENGTH(GIC_CPU_PRIMASK,
 471                 vgic_mmio_read_vcpuif, vgic_mmio_write_vcpuif, 4,
 472                 VGIC_ACCESS_32bit),
 473         REGISTER_DESC_WITH_LENGTH(GIC_CPU_BINPOINT,
 474                 vgic_mmio_read_vcpuif, vgic_mmio_write_vcpuif, 4,
 475                 VGIC_ACCESS_32bit),
 476         REGISTER_DESC_WITH_LENGTH(GIC_CPU_ALIAS_BINPOINT,
 477                 vgic_mmio_read_vcpuif, vgic_mmio_write_vcpuif, 4,
 478                 VGIC_ACCESS_32bit),
 479         REGISTER_DESC_WITH_LENGTH(GIC_CPU_ACTIVEPRIO,
 480                 vgic_mmio_read_apr, vgic_mmio_write_apr, 16,
 481                 VGIC_ACCESS_32bit),
 482         REGISTER_DESC_WITH_LENGTH(GIC_CPU_IDENT,
 483                 vgic_mmio_read_vcpuif, vgic_mmio_write_vcpuif, 4,
 484                 VGIC_ACCESS_32bit),
 485 };
 486
 487 unsigned int vgic_v2_init_dist_iodev(struct vgic_io_device *dev)
 488 {
 489         dev->regions = vgic_v2_dist_registers;
 490         dev->nr_regions = ARRAY_SIZE(vgic_v2_dist_registers);
 491
 492         kvm_iodevice_init(&dev->dev, &kvm_io_gic_ops);
 493
 494         return SZ_4K;
 495 }
 496
 497 int vgic_v2_has_attr_regs(struct kvm_device *dev, struct kvm_device_attr *attr)
 498 {
 499         const struct vgic_register_region *region;
 500         struct vgic_io_device iodev;
 501         struct vgic_reg_attr reg_attr;
 502         struct kvm_vcpu *vcpu;
 503         gpa_t addr;
 504         int ret;
 505
 506         ret = vgic_v2_parse_attr(dev, attr, &reg_attr);
 507         if (ret)
 508                 return ret;
 509
 510         vcpu = reg_attr.vcpu;
 511         addr = reg_attr.addr;
 512
 513         switch (attr->group) {
 514         case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
 515                 iodev.regions = vgic_v2_dist_registers;
 516                 iodev.nr_regions = ARRAY_SIZE(vgic_v2_dist_registers);
 517                 iodev.base_addr = 0;
 518                 break;
 519         case KVM_DEV_ARM_VGIC_GRP_CPU_REGS:
 520                 iodev.regions = vgic_v2_cpu_registers;
 521                 iodev.nr_regions = ARRAY_SIZE(vgic_v2_cpu_registers);
 522                 iodev.base_addr = 0;
 523                 break;
 524         default:
 525                 return -ENXIO;
 526         }
 527
 528         /* We only support aligned 32-bit accesses. */
 529         if (addr & 3)
 530                 return -ENXIO;
 531
 532         region = vgic_get_mmio_region(vcpu, &iodev, addr, sizeof(u32));
 533         if (!region)
 534                 return -ENXIO;
 535
 536         return 0;
 537 }
 538
 539 int vgic_v2_cpuif_uaccess(struct kvm_vcpu *vcpu, bool is_write,
 540                           int offset, u32 *val)
 541 {
 542         struct vgic_io_device dev = {
 543                 .regions = vgic_v2_cpu_registers,
 544                 .nr_regions = ARRAY_SIZE(vgic_v2_cpu_registers),
 545                 .iodev_type = IODEV_CPUIF,
 546         };
 547
 548         return vgic_uaccess(vcpu, &dev, is_write, offset, val);
 549 }
 550
 551 int vgic_v2_dist_uaccess(struct kvm_vcpu *vcpu, bool is_write,
 552                          int offset, u32 *val)
 553 {
 554         struct vgic_io_device dev = {
 555                 .regions = vgic_v2_dist_registers,
 556                 .nr_regions = ARRAY_SIZE(vgic_v2_dist_registers),
 557                 .iodev_type = IODEV_DIST,
 558         };
 559
 560         return vgic_uaccess(vcpu, &dev, is_write, offset, val);
 561 }