virt/kvm/arm/vgic/vgic-v3.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2
   3 #include <linux/irqchip/arm-gic-v3.h>
   4 #include <linux/kvm.h>
   5 #include <linux/kvm_host.h>
   6 #include <kvm/arm_vgic.h>
   7 #include <asm/kvm_hyp.h>
   8 #include <asm/kvm_mmu.h>
   9 #include <asm/kvm_asm.h>
  10
  11 #include "vgic.h"
  12
  13 static bool group0_trap;
  14 static bool group1_trap;
  15 static bool common_trap;
  16 static bool gicv4_enable;
  17
  18 void vgic_v3_set_underflow(struct kvm_vcpu *vcpu)
  19 {
  20         struct vgic_v3_cpu_if *cpuif = &vcpu->arch.vgic_cpu.vgic_v3;
  21
  22         cpuif->vgic_hcr |= ICH_HCR_UIE;
  23 }
  24
  25 static bool lr_signals_eoi_mi(u64 lr_val)
  26 {
  27         return !(lr_val & ICH_LR_STATE) && (lr_val & ICH_LR_EOI) &&
  28                !(lr_val & ICH_LR_HW);
  29 }
  30
  31 void vgic_v3_fold_lr_state(struct kvm_vcpu *vcpu)
  32 {
  33         struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
  34         struct vgic_v3_cpu_if *cpuif = &vgic_cpu->vgic_v3;
  35         u32 model = vcpu->kvm->arch.vgic.vgic_model;
  36         int lr;
  37
  38         DEBUG_SPINLOCK_BUG_ON(!irqs_disabled());
  39
  40         cpuif->vgic_hcr &= ~ICH_HCR_UIE;
  41
  42         for (lr = 0; lr < vgic_cpu->used_lrs; lr++) {
  43                 u64 val = cpuif->vgic_lr[lr];
  44                 u32 intid, cpuid;
  45                 struct vgic_irq *irq;
  46                 bool is_v2_sgi = false;
  47
  48                 cpuid = val & GICH_LR_PHYSID_CPUID;
  49                 cpuid >>= GICH_LR_PHYSID_CPUID_SHIFT;
  50
  51                 if (model == KVM_DEV_TYPE_ARM_VGIC_V3) {
  52                         intid = val & ICH_LR_VIRTUAL_ID_MASK;
  53                 } else {
  54                         intid = val & GICH_LR_VIRTUALID;
  55                         is_v2_sgi = vgic_irq_is_sgi(intid);
  56                 }
  57
  58                 /* Notify fds when the guest EOI'ed a level-triggered IRQ */
  59                 if (lr_signals_eoi_mi(val) && vgic_valid_spi(vcpu->kvm, intid))
  60                         kvm_notify_acked_irq(vcpu->kvm, 0,
  61                                              intid - VGIC_NR_PRIVATE_IRQS);
  62
  63                 irq = vgic_get_irq(vcpu->kvm, vcpu, intid);
  64                 if (!irq)       /* An LPI could have been unmapped. */
  65                         continue;
  66
  67                 raw_spin_lock(&irq->irq_lock);
  68
  69                 /* Always preserve the active bit */
  70                 irq->active = !!(val & ICH_LR_ACTIVE_BIT);
  71
  72                 if (irq->active && is_v2_sgi)
  73                         irq->active_source = cpuid;
  74
  75                 /* Edge is the only case where we preserve the pending bit */
  76                 if (irq->config == VGIC_CONFIG_EDGE &&
  77                     (val & ICH_LR_PENDING_BIT)) {
  78                         irq->pending_latch = true;
  79
  80                         if (is_v2_sgi)
  81                                 irq->source |= (1 << cpuid);
  82                 }
  83
  84                 /*
  85                  * Clear soft pending state when level irqs have been acked.
  86                  */
  87                 if (irq->config == VGIC_CONFIG_LEVEL && !(val & ICH_LR_STATE))
  88                         irq->pending_latch = false;
  89
  90                 /*
  91                  * Level-triggered mapped IRQs are special because we only
  92                  * observe rising edges as input to the VGIC.
  93                  *
  94                  * If the guest never acked the interrupt we have to sample
  95                  * the physical line and set the line level, because the
  96                  * device state could have changed or we simply need to
  97                  * process the still pending interrupt later.
  98                  *
  99                  * If this causes us to lower the level, we have to also clear
 100                  * the physical active state, since we will otherwise never be
 101                  * told when the interrupt becomes asserted again.
 102                  */
 103                 if (vgic_irq_is_mapped_level(irq) && (val & ICH_LR_PENDING_BIT)) {
 104                         irq->line_level = vgic_get_phys_line_level(irq);
 105
 106                         if (!irq->line_level)
 107                                 vgic_irq_set_phys_active(irq, false);
 108                 }
 109
 110                 raw_spin_unlock(&irq->irq_lock);
 111                 vgic_put_irq(vcpu->kvm, irq);
 112         }
 113
 114         vgic_cpu->used_lrs = 0;
 115 }
 116
 117 /* Requires the irq to be locked already */
 118 void vgic_v3_populate_lr(struct kvm_vcpu *vcpu, struct vgic_irq *irq, int lr)
 119 {
 120         u32 model = vcpu->kvm->arch.vgic.vgic_model;
 121         u64 val = irq->intid;
 122         bool allow_pending = true, is_v2_sgi;
 123
 124         is_v2_sgi = (vgic_irq_is_sgi(irq->intid) &&
 125                      model == KVM_DEV_TYPE_ARM_VGIC_V2);
 126
 127         if (irq->active) {
 128                 val |= ICH_LR_ACTIVE_BIT;
 129                 if (is_v2_sgi)
 130                         val |= irq->active_source << GICH_LR_PHYSID_CPUID_SHIFT;
 131                 if (vgic_irq_is_multi_sgi(irq)) {
 132                         allow_pending = false;
 133                         val |= ICH_LR_EOI;
 134                 }
 135         }
 136
 137         if (irq->hw) {
 138                 val |= ICH_LR_HW;
 139                 val |= ((u64)irq->hwintid) << ICH_LR_PHYS_ID_SHIFT;
 140                 /*
 141                  * Never set pending+active on a HW interrupt, as the
 142                  * pending state is kept at the physical distributor
 143                  * level.
 144                  */
 145                 if (irq->active)
 146                         allow_pending = false;
 147         } else {
 148                 if (irq->config == VGIC_CONFIG_LEVEL) {
 149                         val |= ICH_LR_EOI;
 150
 151                         /*
 152                          * Software resampling doesn't work very well
 153                          * if we allow P+A, so let's not do that.
 154                          */
 155                         if (irq->active)
 156                                 allow_pending = false;
 157                 }
 158         }
 159
 160         if (allow_pending && irq_is_pending(irq)) {
 161                 val |= ICH_LR_PENDING_BIT;
 162
 163                 if (irq->config == VGIC_CONFIG_EDGE)
 164                         irq->pending_latch = false;
 165
 166                 if (vgic_irq_is_sgi(irq->intid) &&
 167                     model == KVM_DEV_TYPE_ARM_VGIC_V2) {
 168                         u32 src = ffs(irq->source);
 169
 170                         if (WARN_RATELIMIT(!src, "No SGI source for INTID %d\n",
 171                                            irq->intid))
 172                                 return;
 173
 174                         val |= (src - 1) << GICH_LR_PHYSID_CPUID_SHIFT;
 175                         irq->source &= ~(1 << (src - 1));
 176                         if (irq->source) {
 177                                 irq->pending_latch = true;
 178                                 val |= ICH_LR_EOI;
 179                         }
 180                 }
 181         }
 182
 183         /*
 184          * Level-triggered mapped IRQs are special because we only observe
 185          * rising edges as input to the VGIC.  We therefore lower the line
 186          * level here, so that we can take new virtual IRQs.  See
 187          * vgic_v3_fold_lr_state for more info.
 188          */
 189         if (vgic_irq_is_mapped_level(irq) && (val & ICH_LR_PENDING_BIT))
 190                 irq->line_level = false;
 191
 192         if (irq->group)
 193                 val |= ICH_LR_GROUP;
 194
 195         val |= (u64)irq->priority << ICH_LR_PRIORITY_SHIFT;
 196
 197         vcpu->arch.vgic_cpu.vgic_v3.vgic_lr[lr] = val;
 198 }
 199
 200 void vgic_v3_clear_lr(struct kvm_vcpu *vcpu, int lr)
 201 {
 202         vcpu->arch.vgic_cpu.vgic_v3.vgic_lr[lr] = 0;
 203 }
 204
 205 void vgic_v3_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcrp)
 206 {
 207         struct vgic_v3_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v3;
 208         u32 model = vcpu->kvm->arch.vgic.vgic_model;
 209         u32 vmcr;
 210
 211         if (model == KVM_DEV_TYPE_ARM_VGIC_V2) {
 212                 vmcr = (vmcrp->ackctl << ICH_VMCR_ACK_CTL_SHIFT) &
 213                         ICH_VMCR_ACK_CTL_MASK;
 214                 vmcr |= (vmcrp->fiqen << ICH_VMCR_FIQ_EN_SHIFT) &
 215                         ICH_VMCR_FIQ_EN_MASK;
 216         } else {
 217                 /*
 218                  * When emulating GICv3 on GICv3 with SRE=1 on the
 219                  * VFIQEn bit is RES1 and the VAckCtl bit is RES0.
 220                  */
 221                 vmcr = ICH_VMCR_FIQ_EN_MASK;
 222         }
 223
 224         vmcr |= (vmcrp->cbpr << ICH_VMCR_CBPR_SHIFT) & ICH_VMCR_CBPR_MASK;
 225         vmcr |= (vmcrp->eoim << ICH_VMCR_EOIM_SHIFT) & ICH_VMCR_EOIM_MASK;
 226         vmcr |= (vmcrp->abpr << ICH_VMCR_BPR1_SHIFT) & ICH_VMCR_BPR1_MASK;
 227         vmcr |= (vmcrp->bpr << ICH_VMCR_BPR0_SHIFT) & ICH_VMCR_BPR0_MASK;
 228         vmcr |= (vmcrp->pmr << ICH_VMCR_PMR_SHIFT) & ICH_VMCR_PMR_MASK;
 229         vmcr |= (vmcrp->grpen0 << ICH_VMCR_ENG0_SHIFT) & ICH_VMCR_ENG0_MASK;
 230         vmcr |= (vmcrp->grpen1 << ICH_VMCR_ENG1_SHIFT) & ICH_VMCR_ENG1_MASK;
 231
 232         cpu_if->vgic_vmcr = vmcr;
 233 }
 234
 235 void vgic_v3_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcrp)
 236 {
 237         struct vgic_v3_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v3;
 238         u32 model = vcpu->kvm->arch.vgic.vgic_model;
 239         u32 vmcr;
 240
 241         vmcr = cpu_if->vgic_vmcr;
 242
 243         if (model == KVM_DEV_TYPE_ARM_VGIC_V2) {
 244                 vmcrp->ackctl = (vmcr & ICH_VMCR_ACK_CTL_MASK) >>
 245                         ICH_VMCR_ACK_CTL_SHIFT;
 246                 vmcrp->fiqen = (vmcr & ICH_VMCR_FIQ_EN_MASK) >>
 247                         ICH_VMCR_FIQ_EN_SHIFT;
 248         } else {
 249                 /*
 250                  * When emulating GICv3 on GICv3 with SRE=1 on the
 251                  * VFIQEn bit is RES1 and the VAckCtl bit is RES0.
 252                  */
 253                 vmcrp->fiqen = 1;
 254                 vmcrp->ackctl = 0;
 255         }
 256
 257         vmcrp->cbpr = (vmcr & ICH_VMCR_CBPR_MASK) >> ICH_VMCR_CBPR_SHIFT;
 258         vmcrp->eoim = (vmcr & ICH_VMCR_EOIM_MASK) >> ICH_VMCR_EOIM_SHIFT;
 259         vmcrp->abpr = (vmcr & ICH_VMCR_BPR1_MASK) >> ICH_VMCR_BPR1_SHIFT;
 260         vmcrp->bpr  = (vmcr & ICH_VMCR_BPR0_MASK) >> ICH_VMCR_BPR0_SHIFT;
 261         vmcrp->pmr  = (vmcr & ICH_VMCR_PMR_MASK) >> ICH_VMCR_PMR_SHIFT;
 262         vmcrp->grpen0 = (vmcr & ICH_VMCR_ENG0_MASK) >> ICH_VMCR_ENG0_SHIFT;
 263         vmcrp->grpen1 = (vmcr & ICH_VMCR_ENG1_MASK) >> ICH_VMCR_ENG1_SHIFT;
 264 }
 265
 266 #define INITIAL_PENDBASER_VALUE                                           \
 267         (GIC_BASER_CACHEABILITY(GICR_PENDBASER, INNER, RaWb)            | \
 268         GIC_BASER_CACHEABILITY(GICR_PENDBASER, OUTER, SameAsInner)      | \
 269         GIC_BASER_SHAREABILITY(GICR_PENDBASER, InnerShareable))
 270
 271 void vgic_v3_enable(struct kvm_vcpu *vcpu)
 272 {
 273         struct vgic_v3_cpu_if *vgic_v3 = &vcpu->arch.vgic_cpu.vgic_v3;
 274
 275         /*
 276          * By forcing VMCR to zero, the GIC will restore the binary
 277          * points to their reset values. Anything else resets to zero
 278          * anyway.
 279          */
 280         vgic_v3->vgic_vmcr = 0;
 281
 282         /*
 283          * If we are emulating a GICv3, we do it in an non-GICv2-compatible
 284          * way, so we force SRE to 1 to demonstrate this to the guest.
 285          * Also, we don't support any form of IRQ/FIQ bypass.
 286          * This goes with the spec allowing the value to be RAO/WI.
 287          */
 288         if (vcpu->kvm->arch.vgic.vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3) {
 289                 vgic_v3->vgic_sre = (ICC_SRE_EL1_DIB |
 290                                      ICC_SRE_EL1_DFB |
 291                                      ICC_SRE_EL1_SRE);
 292                 vcpu->arch.vgic_cpu.pendbaser = INITIAL_PENDBASER_VALUE;
 293         } else {
 294                 vgic_v3->vgic_sre = 0;
 295         }
 296
 297         vcpu->arch.vgic_cpu.num_id_bits = (kvm_vgic_global_state.ich_vtr_el2 &
 298                                            ICH_VTR_ID_BITS_MASK) >>
 299                                            ICH_VTR_ID_BITS_SHIFT;
 300         vcpu->arch.vgic_cpu.num_pri_bits = ((kvm_vgic_global_state.ich_vtr_el2 &
 301                                             ICH_VTR_PRI_BITS_MASK) >>
 302                                             ICH_VTR_PRI_BITS_SHIFT) + 1;
 303
 304         /* Get the show on the road... */
 305         vgic_v3->vgic_hcr = ICH_HCR_EN;
 306         if (group0_trap)
 307                 vgic_v3->vgic_hcr |= ICH_HCR_TALL0;
 308         if (group1_trap)
 309                 vgic_v3->vgic_hcr |= ICH_HCR_TALL1;
 310         if (common_trap)
 311                 vgic_v3->vgic_hcr |= ICH_HCR_TC;
 312 }
 313
 314 int vgic_v3_lpi_sync_pending_status(struct kvm *kvm, struct vgic_irq *irq)
 315 {
 316         struct kvm_vcpu *vcpu;
 317         int byte_offset, bit_nr;
 318         gpa_t pendbase, ptr;
 319         bool status;
 320         u8 val;
 321         int ret;
 322         unsigned long flags;
 323
 324 retry:
 325         vcpu = irq->target_vcpu;
 326         if (!vcpu)
 327                 return 0;
 328
 329         pendbase = GICR_PENDBASER_ADDRESS(vcpu->arch.vgic_cpu.pendbaser);
 330
 331         byte_offset = irq->intid / BITS_PER_BYTE;
 332         bit_nr = irq->intid % BITS_PER_BYTE;
 333         ptr = pendbase + byte_offset;
 334
 335         ret = kvm_read_guest_lock(kvm, ptr, &val, 1);
 336         if (ret)
 337                 return ret;
 338
 339         status = val & (1 << bit_nr);
 340
 341         raw_spin_lock_irqsave(&irq->irq_lock, flags);
 342         if (irq->target_vcpu != vcpu) {
 343                 raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
 344                 goto retry;
 345         }
 346         irq->pending_latch = status;
 347         vgic_queue_irq_unlock(vcpu->kvm, irq, flags);
 348
 349         if (status) {
 350                 /* clear consumed data */
 351                 val &= ~(1 << bit_nr);
 352                 ret = kvm_write_guest_lock(kvm, ptr, &val, 1);
 353                 if (ret)
 354                         return ret;
 355         }
 356         return 0;
 357 }
 358
 359 /**
 360  * vgic_its_save_pending_tables - Save the pending tables into guest RAM
 361  * kvm lock and all vcpu lock must be held
 362  */
 363 int vgic_v3_save_pending_tables(struct kvm *kvm)
 364 {
 365         struct vgic_dist *dist = &kvm->arch.vgic;
 366         int last_byte_offset = -1;
 367         struct vgic_irq *irq;
 368         int ret;
 369         u8 val;
 370
 371         list_for_each_entry(irq, &dist->lpi_list_head, lpi_list) {
 372                 int byte_offset, bit_nr;
 373                 struct kvm_vcpu *vcpu;
 374                 gpa_t pendbase, ptr;
 375                 bool stored;
 376
 377                 vcpu = irq->target_vcpu;
 378                 if (!vcpu)
 379                         continue;
 380
 381                 pendbase = GICR_PENDBASER_ADDRESS(vcpu->arch.vgic_cpu.pendbaser);
 382
 383                 byte_offset = irq->intid / BITS_PER_BYTE;
 384                 bit_nr = irq->intid % BITS_PER_BYTE;
 385                 ptr = pendbase + byte_offset;
 386
 387                 if (byte_offset != last_byte_offset) {
 388                         ret = kvm_read_guest_lock(kvm, ptr, &val, 1);
 389                         if (ret)
 390                                 return ret;
 391                         last_byte_offset = byte_offset;
 392                 }
 393
 394                 stored = val & (1U << bit_nr);
 395                 if (stored == irq->pending_latch)
 396                         continue;
 397
 398                 if (irq->pending_latch)
 399                         val |= 1 << bit_nr;
 400                 else
 401                         val &= ~(1 << bit_nr);
 402
 403                 ret = kvm_write_guest_lock(kvm, ptr, &val, 1);
 404                 if (ret)
 405                         return ret;
 406         }
 407         return 0;
 408 }
 409
 410 /**
 411  * vgic_v3_rdist_overlap - check if a region overlaps with any
 412  * existing redistributor region
 413  *
 414  * @kvm: kvm handle
 415  * @base: base of the region
 416  * @size: size of region
 417  *
 418  * Return: true if there is an overlap
 419  */
 420 bool vgic_v3_rdist_overlap(struct kvm *kvm, gpa_t base, size_t size)
 421 {
 422         struct vgic_dist *d = &kvm->arch.vgic;
 423         struct vgic_redist_region *rdreg;
 424
 425         list_for_each_entry(rdreg, &d->rd_regions, list) {
 426                 if ((base + size > rdreg->base) &&
 427                         (base < rdreg->base + vgic_v3_rd_region_size(kvm, rdreg)))
 428                         return true;
 429         }
 430         return false;
 431 }
 432
 433 /*
 434  * Check for overlapping regions and for regions crossing the end of memory
 435  * for base addresses which have already been set.
 436  */
 437 bool vgic_v3_check_base(struct kvm *kvm)
 438 {
 439         struct vgic_dist *d = &kvm->arch.vgic;
 440         struct vgic_redist_region *rdreg;
 441
 442         if (!IS_VGIC_ADDR_UNDEF(d->vgic_dist_base) &&
 443             d->vgic_dist_base + KVM_VGIC_V3_DIST_SIZE < d->vgic_dist_base)
 444                 return false;
 445
 446         list_for_each_entry(rdreg, &d->rd_regions, list) {
 447                 if (rdreg->base + vgic_v3_rd_region_size(kvm, rdreg) <
 448                         rdreg->base)
 449                         return false;
 450         }
 451
 452         if (IS_VGIC_ADDR_UNDEF(d->vgic_dist_base))
 453                 return true;
 454
 455         return !vgic_v3_rdist_overlap(kvm, d->vgic_dist_base,
 456                                       KVM_VGIC_V3_DIST_SIZE);
 457 }
 458
 459 /**
 460  * vgic_v3_rdist_free_slot - Look up registered rdist regions and identify one
 461  * which has free space to put a new rdist region.
 462  *
 463  * @rd_regions: redistributor region list head
 464  *
 465  * A redistributor regions maps n redistributors, n = region size / (2 x 64kB).
 466  * Stride between redistributors is 0 and regions are filled in the index order.
 467  *
 468  * Return: the redist region handle, if any, that has space to map a new rdist
 469  * region.
 470  */
 471 struct vgic_redist_region *vgic_v3_rdist_free_slot(struct list_head *rd_regions)
 472 {
 473         struct vgic_redist_region *rdreg;
 474
 475         list_for_each_entry(rdreg, rd_regions, list) {
 476                 if (!vgic_v3_redist_region_full(rdreg))
 477                         return rdreg;
 478         }
 479         return NULL;
 480 }
 481
 482 struct vgic_redist_region *vgic_v3_rdist_region_from_index(struct kvm *kvm,
 483                                                            u32 index)
 484 {
 485         struct list_head *rd_regions = &kvm->arch.vgic.rd_regions;
 486         struct vgic_redist_region *rdreg;
 487
 488         list_for_each_entry(rdreg, rd_regions, list) {
 489                 if (rdreg->index == index)
 490                         return rdreg;
 491         }
 492         return NULL;
 493 }
 494
 495
 496 int vgic_v3_map_resources(struct kvm *kvm)
 497 {
 498         struct vgic_dist *dist = &kvm->arch.vgic;
 499         struct kvm_vcpu *vcpu;
 500         int ret = 0;
 501         int c;
 502
 503         if (vgic_ready(kvm))
 504                 goto out;
 505
 506         kvm_for_each_vcpu(c, vcpu, kvm) {
 507                 struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
 508
 509                 if (IS_VGIC_ADDR_UNDEF(vgic_cpu->rd_iodev.base_addr)) {
 510                         kvm_debug("vcpu %d redistributor base not set\n", c);
 511                         ret = -ENXIO;
 512                         goto out;
 513                 }
 514         }
 515
 516         if (IS_VGIC_ADDR_UNDEF(dist->vgic_dist_base)) {
 517                 kvm_err("Need to set vgic distributor addresses first\n");
 518                 ret = -ENXIO;
 519                 goto out;
 520         }
 521
 522         if (!vgic_v3_check_base(kvm)) {
 523                 kvm_err("VGIC redist and dist frames overlap\n");
 524                 ret = -EINVAL;
 525                 goto out;
 526         }
 527
 528         /*
 529          * For a VGICv3 we require the userland to explicitly initialize
 530          * the VGIC before we need to use it.
 531          */
 532         if (!vgic_initialized(kvm)) {
 533                 ret = -EBUSY;
 534                 goto out;
 535         }
 536
 537         ret = vgic_register_dist_iodev(kvm, dist->vgic_dist_base, VGIC_V3);
 538         if (ret) {
 539                 kvm_err("Unable to register VGICv3 dist MMIO regions\n");
 540                 goto out;
 541         }
 542
 543         dist->ready = true;
 544
 545 out:
 546         return ret;
 547 }
 548
 549 DEFINE_STATIC_KEY_FALSE(vgic_v3_cpuif_trap);
 550
 551 static int __init early_group0_trap_cfg(char *buf)
 552 {
 553         return strtobool(buf, &group0_trap);
 554 }
 555 early_param("kvm-arm.vgic_v3_group0_trap", early_group0_trap_cfg);
 556
 557 static int __init early_group1_trap_cfg(char *buf)
 558 {
 559         return strtobool(buf, &group1_trap);
 560 }
 561 early_param("kvm-arm.vgic_v3_group1_trap", early_group1_trap_cfg);
 562
 563 static int __init early_common_trap_cfg(char *buf)
 564 {
 565         return strtobool(buf, &common_trap);
 566 }
 567 early_param("kvm-arm.vgic_v3_common_trap", early_common_trap_cfg);
 568
 569 static int __init early_gicv4_enable(char *buf)
 570 {
 571         return strtobool(buf, &gicv4_enable);
 572 }
 573 early_param("kvm-arm.vgic_v4_enable", early_gicv4_enable);
 574
 575 /**
 576  * vgic_v3_probe - probe for a VGICv3 compatible interrupt controller
 577  * @info:       pointer to the GIC description
 578  *
 579  * Returns 0 if the VGICv3 has been probed successfully, returns an error code
 580  * otherwise
 581  */
 582 int vgic_v3_probe(const struct gic_kvm_info *info)
 583 {
 584         u32 ich_vtr_el2 = kvm_call_hyp_ret(__vgic_v3_get_ich_vtr_el2);
 585         int ret;
 586
 587         /*
 588          * The ListRegs field is 5 bits, but there is a architectural
 589          * maximum of 16 list registers. Just ignore bit 4...
 590          */
 591         kvm_vgic_global_state.nr_lr = (ich_vtr_el2 & 0xf) + 1;
 592         kvm_vgic_global_state.can_emulate_gicv2 = false;
 593         kvm_vgic_global_state.ich_vtr_el2 = ich_vtr_el2;
 594
 595         /* GICv4 support? */
 596         if (info->has_v4) {
 597                 kvm_vgic_global_state.has_gicv4 = gicv4_enable;
 598                 kvm_info("GICv4 support %sabled\n",
 599                          gicv4_enable ? "en" : "dis");
 600         }
 601
 602         if (!info->vcpu.start) {
 603                 kvm_info("GICv3: no GICV resource entry\n");
 604                 kvm_vgic_global_state.vcpu_base = 0;
 605         } else if (!PAGE_ALIGNED(info->vcpu.start)) {
 606                 pr_warn("GICV physical address 0x%llx not page aligned\n",
 607                         (unsigned long long)info->vcpu.start);
 608                 kvm_vgic_global_state.vcpu_base = 0;
 609         } else {
 610                 kvm_vgic_global_state.vcpu_base = info->vcpu.start;
 611                 kvm_vgic_global_state.can_emulate_gicv2 = true;
 612                 ret = kvm_register_vgic_device(KVM_DEV_TYPE_ARM_VGIC_V2);
 613                 if (ret) {
 614                         kvm_err("Cannot register GICv2 KVM device.\n");
 615                         return ret;
 616                 }
 617                 kvm_info("vgic-v2@%llx\n", info->vcpu.start);
 618         }
 619         ret = kvm_register_vgic_device(KVM_DEV_TYPE_ARM_VGIC_V3);
 620         if (ret) {
 621                 kvm_err("Cannot register GICv3 KVM device.\n");
 622                 kvm_unregister_device_ops(KVM_DEV_TYPE_ARM_VGIC_V2);
 623                 return ret;
 624         }
 625
 626         if (kvm_vgic_global_state.vcpu_base == 0)
 627                 kvm_info("disabling GICv2 emulation\n");
 628
 629 #ifdef CONFIG_ARM64
 630         if (cpus_have_const_cap(ARM64_WORKAROUND_CAVIUM_30115)) {
 631                 group0_trap = true;
 632                 group1_trap = true;
 633         }
 634 #endif
 635
 636         if (group0_trap || group1_trap || common_trap) {
 637                 kvm_info("GICv3 sysreg trapping enabled ([%s%s%s], reduced performance)\n",
 638                          group0_trap ? "G0" : "",
 639                          group1_trap ? "G1" : "",
 640                          common_trap ? "C"  : "");
 641                 static_branch_enable(&vgic_v3_cpuif_trap);
 642         }
 643
 644         kvm_vgic_global_state.vctrl_base = NULL;
 645         kvm_vgic_global_state.type = VGIC_V3;
 646         kvm_vgic_global_state.max_gic_vcpus = VGIC_V3_MAX_CPUS;
 647
 648         return 0;
 649 }
 650
 651 void vgic_v3_load(struct kvm_vcpu *vcpu)
 652 {
 653         struct vgic_v3_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v3;
 654
 655         /*
 656          * If dealing with a GICv2 emulation on GICv3, VMCR_EL2.VFIQen
 657          * is dependent on ICC_SRE_EL1.SRE, and we have to perform the
 658          * VMCR_EL2 save/restore in the world switch.
 659          */
 660         if (likely(cpu_if->vgic_sre))
 661                 kvm_call_hyp(__vgic_v3_write_vmcr, cpu_if->vgic_vmcr);
 662
 663         kvm_call_hyp(__vgic_v3_restore_aprs, vcpu);
 664
 665         if (has_vhe())
 666                 __vgic_v3_activate_traps(vcpu);
 667 }
 668
 669 void vgic_v3_vmcr_sync(struct kvm_vcpu *vcpu)
 670 {
 671         struct vgic_v3_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v3;
 672
 673         if (likely(cpu_if->vgic_sre))
 674                 cpu_if->vgic_vmcr = kvm_call_hyp_ret(__vgic_v3_read_vmcr);
 675 }
 676
 677 void vgic_v3_put(struct kvm_vcpu *vcpu)
 678 {
 679         vgic_v3_vmcr_sync(vcpu);
 680
 681         kvm_call_hyp(__vgic_v3_save_aprs, vcpu);
 682
 683         if (has_vhe())
 684                 __vgic_v3_deactivate_traps(vcpu);
 685 }