virt/kvm/arm/vgic.c

   1 /*
   2  * Copyright (C) 2012 ARM Ltd.
   3  * Author: Marc Zyngier <marc.zyngier@arm.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  17  */
  18
  19 #include <linux/cpu.h>
  20 #include <linux/kvm.h>
  21 #include <linux/kvm_host.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/io.h>
  24 #include <linux/of.h>
  25 #include <linux/of_address.h>
  26 #include <linux/of_irq.h>
  27 #include <linux/uaccess.h>
  28
  29 #include <linux/irqchip/arm-gic.h>
  30
  31 #include <asm/kvm_emulate.h>
  32 #include <asm/kvm_arm.h>
  33 #include <asm/kvm_mmu.h>
  34
  35 /*
  36  * How the whole thing works (courtesy of Christoffer Dall):
  37  *
  38  * - At any time, the dist->irq_pending_on_cpu is the oracle that knows if
  39  *   something is pending
  40  * - VGIC pending interrupts are stored on the vgic.irq_state vgic
  41  *   bitmap (this bitmap is updated by both user land ioctls and guest
  42  *   mmio ops, and other in-kernel peripherals such as the
  43  *   arch. timers) and indicate the 'wire' state.
  44  * - Every time the bitmap changes, the irq_pending_on_cpu oracle is
  45  *   recalculated
  46  * - To calculate the oracle, we need info for each cpu from
  47  *   compute_pending_for_cpu, which considers:
  48  *   - PPI: dist->irq_state & dist->irq_enable
  49  *   - SPI: dist->irq_state & dist->irq_enable & dist->irq_spi_target
  50  *   - irq_spi_target is a 'formatted' version of the GICD_ICFGR
  51  *     registers, stored on each vcpu. We only keep one bit of
  52  *     information per interrupt, making sure that only one vcpu can
  53  *     accept the interrupt.
  54  * - The same is true when injecting an interrupt, except that we only
  55  *   consider a single interrupt at a time. The irq_spi_cpu array
  56  *   contains the target CPU for each SPI.
  57  *
  58  * The handling of level interrupts adds some extra complexity. We
  59  * need to track when the interrupt has been EOIed, so we can sample
  60  * the 'line' again. This is achieved as such:
  61  *
  62  * - When a level interrupt is moved onto a vcpu, the corresponding
  63  *   bit in irq_active is set. As long as this bit is set, the line
  64  *   will be ignored for further interrupts. The interrupt is injected
  65  *   into the vcpu with the GICH_LR_EOI bit set (generate a
  66  *   maintenance interrupt on EOI).
  67  * - When the interrupt is EOIed, the maintenance interrupt fires,
  68  *   and clears the corresponding bit in irq_active. This allow the
  69  *   interrupt line to be sampled again.
  70  */
  71
  72 #define VGIC_ADDR_UNDEF         (-1)
  73 #define IS_VGIC_ADDR_UNDEF(_x)  ((_x) == VGIC_ADDR_UNDEF)
  74
  75 #define PRODUCT_ID_KVM          0x4b    /* ASCII code K */
  76 #define IMPLEMENTER_ARM         0x43b
  77 #define GICC_ARCH_VERSION_V2    0x2
  78
  79 /* Physical address of vgic virtual cpu interface */
  80 static phys_addr_t vgic_vcpu_base;
  81
  82 /* Virtual control interface base address */
  83 static void __iomem *vgic_vctrl_base;
  84
  85 static struct device_node *vgic_node;
  86
  87 #define ACCESS_READ_VALUE       (1 << 0)
  88 #define ACCESS_READ_RAZ         (0 << 0)
  89 #define ACCESS_READ_MASK(x)     ((x) & (1 << 0))
  90 #define ACCESS_WRITE_IGNORED    (0 << 1)
  91 #define ACCESS_WRITE_SETBIT     (1 << 1)
  92 #define ACCESS_WRITE_CLEARBIT   (2 << 1)
  93 #define ACCESS_WRITE_VALUE      (3 << 1)
  94 #define ACCESS_WRITE_MASK(x)    ((x) & (3 << 1))
  95
  96 static void vgic_retire_disabled_irqs(struct kvm_vcpu *vcpu);
  97 static void vgic_update_state(struct kvm *kvm);
  98 static void vgic_kick_vcpus(struct kvm *kvm);
  99 static void vgic_dispatch_sgi(struct kvm_vcpu *vcpu, u32 reg);
 100 static u32 vgic_nr_lr;
 101
 102 static unsigned int vgic_maint_irq;
 103
 104 static u32 *vgic_bitmap_get_reg(struct vgic_bitmap *x,
 105                                 int cpuid, u32 offset)
 106 {
 107         offset >>= 2;
 108         if (!offset)
 109                 return x->percpu[cpuid].reg;
 110         else
 111                 return x->shared.reg + offset - 1;
 112 }
 113
 114 static int vgic_bitmap_get_irq_val(struct vgic_bitmap *x,
 115                                    int cpuid, int irq)
 116 {
 117         if (irq < VGIC_NR_PRIVATE_IRQS)
 118                 return test_bit(irq, x->percpu[cpuid].reg_ul);
 119
 120         return test_bit(irq - VGIC_NR_PRIVATE_IRQS, x->shared.reg_ul);
 121 }
 122
 123 static void vgic_bitmap_set_irq_val(struct vgic_bitmap *x, int cpuid,
 124                                     int irq, int val)
 125 {
 126         unsigned long *reg;
 127
 128         if (irq < VGIC_NR_PRIVATE_IRQS) {
 129                 reg = x->percpu[cpuid].reg_ul;
 130         } else {
 131                 reg =  x->shared.reg_ul;
 132                 irq -= VGIC_NR_PRIVATE_IRQS;
 133         }
 134
 135         if (val)
 136                 set_bit(irq, reg);
 137         else
 138                 clear_bit(irq, reg);
 139 }
 140
 141 static unsigned long *vgic_bitmap_get_cpu_map(struct vgic_bitmap *x, int cpuid)
 142 {
 143         if (unlikely(cpuid >= VGIC_MAX_CPUS))
 144                 return NULL;
 145         return x->percpu[cpuid].reg_ul;
 146 }
 147
 148 static unsigned long *vgic_bitmap_get_shared_map(struct vgic_bitmap *x)
 149 {
 150         return x->shared.reg_ul;
 151 }
 152
 153 static u32 *vgic_bytemap_get_reg(struct vgic_bytemap *x, int cpuid, u32 offset)
 154 {
 155         offset >>= 2;
 156         BUG_ON(offset > (VGIC_NR_IRQS / 4));
 157         if (offset < 8)
 158                 return x->percpu[cpuid] + offset;
 159         else
 160                 return x->shared + offset - 8;
 161 }
 162
 163 #define VGIC_CFG_LEVEL  0
 164 #define VGIC_CFG_EDGE   1
 165
 166 static bool vgic_irq_is_edge(struct kvm_vcpu *vcpu, int irq)
 167 {
 168         struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
 169         int irq_val;
 170
 171         irq_val = vgic_bitmap_get_irq_val(&dist->irq_cfg, vcpu->vcpu_id, irq);
 172         return irq_val == VGIC_CFG_EDGE;
 173 }
 174
 175 static int vgic_irq_is_enabled(struct kvm_vcpu *vcpu, int irq)
 176 {
 177         struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
 178
 179         return vgic_bitmap_get_irq_val(&dist->irq_enabled, vcpu->vcpu_id, irq);
 180 }
 181
 182 static int vgic_irq_is_active(struct kvm_vcpu *vcpu, int irq)
 183 {
 184         struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
 185
 186         return vgic_bitmap_get_irq_val(&dist->irq_active, vcpu->vcpu_id, irq);
 187 }
 188
 189 static void vgic_irq_set_active(struct kvm_vcpu *vcpu, int irq)
 190 {
 191         struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
 192
 193         vgic_bitmap_set_irq_val(&dist->irq_active, vcpu->vcpu_id, irq, 1);
 194 }
 195
 196 static void vgic_irq_clear_active(struct kvm_vcpu *vcpu, int irq)
 197 {
 198         struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
 199
 200         vgic_bitmap_set_irq_val(&dist->irq_active, vcpu->vcpu_id, irq, 0);
 201 }
 202
 203 static int vgic_dist_irq_is_pending(struct kvm_vcpu *vcpu, int irq)
 204 {
 205         struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
 206
 207         return vgic_bitmap_get_irq_val(&dist->irq_state, vcpu->vcpu_id, irq);
 208 }
 209
 210 static void vgic_dist_irq_set(struct kvm_vcpu *vcpu, int irq)
 211 {
 212         struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
 213
 214         vgic_bitmap_set_irq_val(&dist->irq_state, vcpu->vcpu_id, irq, 1);
 215 }
 216
 217 static void vgic_dist_irq_clear(struct kvm_vcpu *vcpu, int irq)
 218 {
 219         struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
 220
 221         vgic_bitmap_set_irq_val(&dist->irq_state, vcpu->vcpu_id, irq, 0);
 222 }
 223
 224 static void vgic_cpu_irq_set(struct kvm_vcpu *vcpu, int irq)
 225 {
 226         if (irq < VGIC_NR_PRIVATE_IRQS)
 227                 set_bit(irq, vcpu->arch.vgic_cpu.pending_percpu);
 228         else
 229                 set_bit(irq - VGIC_NR_PRIVATE_IRQS,
 230                         vcpu->arch.vgic_cpu.pending_shared);
 231 }
 232
 233 static void vgic_cpu_irq_clear(struct kvm_vcpu *vcpu, int irq)
 234 {
 235         if (irq < VGIC_NR_PRIVATE_IRQS)
 236                 clear_bit(irq, vcpu->arch.vgic_cpu.pending_percpu);
 237         else
 238                 clear_bit(irq - VGIC_NR_PRIVATE_IRQS,
 239                           vcpu->arch.vgic_cpu.pending_shared);
 240 }
 241
 242 static u32 mmio_data_read(struct kvm_exit_mmio *mmio, u32 mask)
 243 {
 244         return *((u32 *)mmio->data) & mask;
 245 }
 246
 247 static void mmio_data_write(struct kvm_exit_mmio *mmio, u32 mask, u32 value)
 248 {
 249         *((u32 *)mmio->data) = value & mask;
 250 }
 251
 252 /**
 253  * vgic_reg_access - access vgic register
 254  * @mmio:   pointer to the data describing the mmio access
 255  * @reg:    pointer to the virtual backing of vgic distributor data
 256  * @offset: least significant 2 bits used for word offset
 257  * @mode:   ACCESS_ mode (see defines above)
 258  *
 259  * Helper to make vgic register access easier using one of the access
 260  * modes defined for vgic register access
 261  * (read,raz,write-ignored,setbit,clearbit,write)
 262  */
 263 static void vgic_reg_access(struct kvm_exit_mmio *mmio, u32 *reg,
 264                             phys_addr_t offset, int mode)
 265 {
 266         int word_offset = (offset & 3) * 8;
 267         u32 mask = (1UL << (mmio->len * 8)) - 1;
 268         u32 regval;
 269
 270         /*
 271          * Any alignment fault should have been delivered to the guest
 272          * directly (ARM ARM B3.12.7 "Prioritization of aborts").
 273          */
 274
 275         if (reg) {
 276                 regval = *reg;
 277         } else {
 278                 BUG_ON(mode != (ACCESS_READ_RAZ | ACCESS_WRITE_IGNORED));
 279                 regval = 0;
 280         }
 281
 282         if (mmio->is_write) {
 283                 u32 data = mmio_data_read(mmio, mask) << word_offset;
 284                 switch (ACCESS_WRITE_MASK(mode)) {
 285                 case ACCESS_WRITE_IGNORED:
 286                         return;
 287
 288                 case ACCESS_WRITE_SETBIT:
 289                         regval |= data;
 290                         break;
 291
 292                 case ACCESS_WRITE_CLEARBIT:
 293                         regval &= ~data;
 294                         break;
 295
 296                 case ACCESS_WRITE_VALUE:
 297                         regval = (regval & ~(mask << word_offset)) | data;
 298                         break;
 299                 }
 300                 *reg = regval;
 301         } else {
 302                 switch (ACCESS_READ_MASK(mode)) {
 303                 case ACCESS_READ_RAZ:
 304                         regval = 0;
 305                         /* fall through */
 306
 307                 case ACCESS_READ_VALUE:
 308                         mmio_data_write(mmio, mask, regval >> word_offset);
 309                 }
 310         }
 311 }
 312
 313 static bool handle_mmio_misc(struct kvm_vcpu *vcpu,
 314                              struct kvm_exit_mmio *mmio, phys_addr_t offset)
 315 {
 316         u32 reg;
 317         u32 word_offset = offset & 3;
 318
 319         switch (offset & ~3) {
 320         case 0:                 /* GICD_CTLR */
 321                 reg = vcpu->kvm->arch.vgic.enabled;
 322                 vgic_reg_access(mmio, &reg, word_offset,
 323                                 ACCESS_READ_VALUE | ACCESS_WRITE_VALUE);
 324                 if (mmio->is_write) {
 325                         vcpu->kvm->arch.vgic.enabled = reg & 1;
 326                         vgic_update_state(vcpu->kvm);
 327                         return true;
 328                 }
 329                 break;
 330
 331         case 4:                 /* GICD_TYPER */
 332                 reg  = (atomic_read(&vcpu->kvm->online_vcpus) - 1) << 5;
 333                 reg |= (VGIC_NR_IRQS >> 5) - 1;
 334                 vgic_reg_access(mmio, &reg, word_offset,
 335                                 ACCESS_READ_VALUE | ACCESS_WRITE_IGNORED);
 336                 break;
 337
 338         case 8:                 /* GICD_IIDR */
 339                 reg = (PRODUCT_ID_KVM << 24) | (IMPLEMENTER_ARM << 0);
 340                 vgic_reg_access(mmio, &reg, word_offset,
 341                                 ACCESS_READ_VALUE | ACCESS_WRITE_IGNORED);
 342                 break;
 343         }
 344
 345         return false;
 346 }
 347
 348 static bool handle_mmio_raz_wi(struct kvm_vcpu *vcpu,
 349                                struct kvm_exit_mmio *mmio, phys_addr_t offset)
 350 {
 351         vgic_reg_access(mmio, NULL, offset,
 352                         ACCESS_READ_RAZ | ACCESS_WRITE_IGNORED);
 353         return false;
 354 }
 355
 356 static bool handle_mmio_set_enable_reg(struct kvm_vcpu *vcpu,
 357                                        struct kvm_exit_mmio *mmio,
 358                                        phys_addr_t offset)
 359 {
 360         u32 *reg = vgic_bitmap_get_reg(&vcpu->kvm->arch.vgic.irq_enabled,
 361                                        vcpu->vcpu_id, offset);
 362         vgic_reg_access(mmio, reg, offset,
 363                         ACCESS_READ_VALUE | ACCESS_WRITE_SETBIT);
 364         if (mmio->is_write) {
 365                 vgic_update_state(vcpu->kvm);
 366                 return true;
 367         }
 368
 369         return false;
 370 }
 371
 372 static bool handle_mmio_clear_enable_reg(struct kvm_vcpu *vcpu,
 373                                          struct kvm_exit_mmio *mmio,
 374                                          phys_addr_t offset)
 375 {
 376         u32 *reg = vgic_bitmap_get_reg(&vcpu->kvm->arch.vgic.irq_enabled,
 377                                        vcpu->vcpu_id, offset);
 378         vgic_reg_access(mmio, reg, offset,
 379                         ACCESS_READ_VALUE | ACCESS_WRITE_CLEARBIT);
 380         if (mmio->is_write) {
 381                 if (offset < 4) /* Force SGI enabled */
 382                         *reg |= 0xffff;
 383                 vgic_retire_disabled_irqs(vcpu);
 384                 vgic_update_state(vcpu->kvm);
 385                 return true;
 386         }
 387
 388         return false;
 389 }
 390
 391 static bool handle_mmio_set_pending_reg(struct kvm_vcpu *vcpu,
 392                                         struct kvm_exit_mmio *mmio,
 393                                         phys_addr_t offset)
 394 {
 395         u32 *reg = vgic_bitmap_get_reg(&vcpu->kvm->arch.vgic.irq_state,
 396                                        vcpu->vcpu_id, offset);
 397         vgic_reg_access(mmio, reg, offset,
 398                         ACCESS_READ_VALUE | ACCESS_WRITE_SETBIT);
 399         if (mmio->is_write) {
 400                 vgic_update_state(vcpu->kvm);
 401                 return true;
 402         }
 403
 404         return false;
 405 }
 406
 407 static bool handle_mmio_clear_pending_reg(struct kvm_vcpu *vcpu,
 408                                           struct kvm_exit_mmio *mmio,
 409                                           phys_addr_t offset)
 410 {
 411         u32 *reg = vgic_bitmap_get_reg(&vcpu->kvm->arch.vgic.irq_state,
 412                                        vcpu->vcpu_id, offset);
 413         vgic_reg_access(mmio, reg, offset,
 414                         ACCESS_READ_VALUE | ACCESS_WRITE_CLEARBIT);
 415         if (mmio->is_write) {
 416                 vgic_update_state(vcpu->kvm);
 417                 return true;
 418         }
 419
 420         return false;
 421 }
 422
 423 static bool handle_mmio_priority_reg(struct kvm_vcpu *vcpu,
 424                                      struct kvm_exit_mmio *mmio,
 425                                      phys_addr_t offset)
 426 {
 427         u32 *reg = vgic_bytemap_get_reg(&vcpu->kvm->arch.vgic.irq_priority,
 428                                         vcpu->vcpu_id, offset);
 429         vgic_reg_access(mmio, reg, offset,
 430                         ACCESS_READ_VALUE | ACCESS_WRITE_VALUE);
 431         return false;
 432 }
 433
 434 #define GICD_ITARGETSR_SIZE     32
 435 #define GICD_CPUTARGETS_BITS    8
 436 #define GICD_IRQS_PER_ITARGETSR (GICD_ITARGETSR_SIZE / GICD_CPUTARGETS_BITS)
 437 static u32 vgic_get_target_reg(struct kvm *kvm, int irq)
 438 {
 439         struct vgic_dist *dist = &kvm->arch.vgic;
 440         int i;
 441         u32 val = 0;
 442
 443         irq -= VGIC_NR_PRIVATE_IRQS;
 444
 445         for (i = 0; i < GICD_IRQS_PER_ITARGETSR; i++)
 446                 val |= 1 << (dist->irq_spi_cpu[irq + i] + i * 8);
 447
 448         return val;
 449 }
 450
 451 static void vgic_set_target_reg(struct kvm *kvm, u32 val, int irq)
 452 {
 453         struct vgic_dist *dist = &kvm->arch.vgic;
 454         struct kvm_vcpu *vcpu;
 455         int i, c;
 456         unsigned long *bmap;
 457         u32 target;
 458
 459         irq -= VGIC_NR_PRIVATE_IRQS;
 460
 461         /*
 462          * Pick the LSB in each byte. This ensures we target exactly
 463          * one vcpu per IRQ. If the byte is null, assume we target
 464          * CPU0.
 465          */
 466         for (i = 0; i < GICD_IRQS_PER_ITARGETSR; i++) {
 467                 int shift = i * GICD_CPUTARGETS_BITS;
 468                 target = ffs((val >> shift) & 0xffU);
 469                 target = target ? (target - 1) : 0;
 470                 dist->irq_spi_cpu[irq + i] = target;
 471                 kvm_for_each_vcpu(c, vcpu, kvm) {
 472                         bmap = vgic_bitmap_get_shared_map(&dist->irq_spi_target[c]);
 473                         if (c == target)
 474                                 set_bit(irq + i, bmap);
 475                         else
 476                                 clear_bit(irq + i, bmap);
 477                 }
 478         }
 479 }
 480
 481 static bool handle_mmio_target_reg(struct kvm_vcpu *vcpu,
 482                                    struct kvm_exit_mmio *mmio,
 483                                    phys_addr_t offset)
 484 {
 485         u32 reg;
 486
 487         /* We treat the banked interrupts targets as read-only */
 488         if (offset < 32) {
 489                 u32 roreg = 1 << vcpu->vcpu_id;
 490                 roreg |= roreg << 8;
 491                 roreg |= roreg << 16;
 492
 493                 vgic_reg_access(mmio, &roreg, offset,
 494                                 ACCESS_READ_VALUE | ACCESS_WRITE_IGNORED);
 495                 return false;
 496         }
 497
 498         reg = vgic_get_target_reg(vcpu->kvm, offset & ~3U);
 499         vgic_reg_access(mmio, &reg, offset,
 500                         ACCESS_READ_VALUE | ACCESS_WRITE_VALUE);
 501         if (mmio->is_write) {
 502                 vgic_set_target_reg(vcpu->kvm, reg, offset & ~3U);
 503                 vgic_update_state(vcpu->kvm);
 504                 return true;
 505         }
 506
 507         return false;
 508 }
 509
 510 static u32 vgic_cfg_expand(u16 val)
 511 {
 512         u32 res = 0;
 513         int i;
 514
 515         /*
 516          * Turn a 16bit value like abcd...mnop into a 32bit word
 517          * a0b0c0d0...m0n0o0p0, which is what the HW cfg register is.
 518          */
 519         for (i = 0; i < 16; i++)
 520                 res |= ((val >> i) & VGIC_CFG_EDGE) << (2 * i + 1);
 521
 522         return res;
 523 }
 524
 525 static u16 vgic_cfg_compress(u32 val)
 526 {
 527         u16 res = 0;
 528         int i;
 529
 530         /*
 531          * Turn a 32bit word a0b0c0d0...m0n0o0p0 into 16bit value like
 532          * abcd...mnop which is what we really care about.
 533          */
 534         for (i = 0; i < 16; i++)
 535                 res |= ((val >> (i * 2 + 1)) & VGIC_CFG_EDGE) << i;
 536
 537         return res;
 538 }
 539
 540 /*
 541  * The distributor uses 2 bits per IRQ for the CFG register, but the
 542  * LSB is always 0. As such, we only keep the upper bit, and use the
 543  * two above functions to compress/expand the bits
 544  */
 545 static bool handle_mmio_cfg_reg(struct kvm_vcpu *vcpu,
 546                                 struct kvm_exit_mmio *mmio, phys_addr_t offset)
 547 {
 548         u32 val;
 549         u32 *reg;
 550
 551         reg = vgic_bitmap_get_reg(&vcpu->kvm->arch.vgic.irq_cfg,
 552                                   vcpu->vcpu_id, offset >> 1);
 553
 554         if (offset & 4)
 555                 val = *reg >> 16;
 556         else
 557                 val = *reg & 0xffff;
 558
 559         val = vgic_cfg_expand(val);
 560         vgic_reg_access(mmio, &val, offset,
 561                         ACCESS_READ_VALUE | ACCESS_WRITE_VALUE);
 562         if (mmio->is_write) {
 563                 if (offset < 8) {
 564                         *reg = ~0U; /* Force PPIs/SGIs to 1 */
 565                         return false;
 566                 }
 567
 568                 val = vgic_cfg_compress(val);
 569                 if (offset & 4) {
 570                         *reg &= 0xffff;
 571                         *reg |= val << 16;
 572                 } else {
 573                         *reg &= 0xffff << 16;
 574                         *reg |= val;
 575                 }
 576         }
 577
 578         return false;
 579 }
 580
 581 static bool handle_mmio_sgi_reg(struct kvm_vcpu *vcpu,
 582                                 struct kvm_exit_mmio *mmio, phys_addr_t offset)
 583 {
 584         u32 reg;
 585         vgic_reg_access(mmio, &reg, offset,
 586                         ACCESS_READ_RAZ | ACCESS_WRITE_VALUE);
 587         if (mmio->is_write) {
 588                 vgic_dispatch_sgi(vcpu, reg);
 589                 vgic_update_state(vcpu->kvm);
 590                 return true;
 591         }
 592
 593         return false;
 594 }
 595
 596 #define LR_CPUID(lr)    \
 597         (((lr) & GICH_LR_PHYSID_CPUID) >> GICH_LR_PHYSID_CPUID_SHIFT)
 598 #define LR_IRQID(lr)    \
 599         ((lr) & GICH_LR_VIRTUALID)
 600
 601 static void vgic_retire_lr(int lr_nr, int irq, struct vgic_cpu *vgic_cpu)
 602 {
 603         clear_bit(lr_nr, vgic_cpu->lr_used);
 604         vgic_cpu->vgic_lr[lr_nr] &= ~GICH_LR_STATE;
 605         vgic_cpu->vgic_irq_lr_map[irq] = LR_EMPTY;
 606 }
 607
 608 /**
 609  * vgic_unqueue_irqs - move pending IRQs from LRs to the distributor
 610  * @vgic_cpu: Pointer to the vgic_cpu struct holding the LRs
 611  *
 612  * Move any pending IRQs that have already been assigned to LRs back to the
 613  * emulated distributor state so that the complete emulated state can be read
 614  * from the main emulation structures without investigating the LRs.
 615  *
 616  * Note that IRQs in the active state in the LRs get their pending state moved
 617  * to the distributor but the active state stays in the LRs, because we don't
 618  * track the active state on the distributor side.
 619  */
 620 static void vgic_unqueue_irqs(struct kvm_vcpu *vcpu)
 621 {
 622         struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
 623         struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
 624         int vcpu_id = vcpu->vcpu_id;
 625         int i, irq, source_cpu;
 626         u32 *lr;
 627
 628         for_each_set_bit(i, vgic_cpu->lr_used, vgic_cpu->nr_lr) {
 629                 lr = &vgic_cpu->vgic_lr[i];
 630                 irq = LR_IRQID(*lr);
 631                 source_cpu = LR_CPUID(*lr);
 632
 633                 /*
 634                  * There are three options for the state bits:
 635                  *
 636                  * 01: pending
 637                  * 10: active
 638                  * 11: pending and active
 639                  *
 640                  * If the LR holds only an active interrupt (not pending) then
 641                  * just leave it alone.
 642                  */
 643                 if ((*lr & GICH_LR_STATE) == GICH_LR_ACTIVE_BIT)
 644                         continue;
 645
 646                 /*
 647                  * Reestablish the pending state on the distributor and the
 648                  * CPU interface.  It may have already been pending, but that
 649                  * is fine, then we are only setting a few bits that were
 650                  * already set.
 651                  */
 652                 vgic_dist_irq_set(vcpu, irq);
 653                 if (irq < VGIC_NR_SGIS)
 654                         dist->irq_sgi_sources[vcpu_id][irq] |= 1 << source_cpu;
 655                 *lr &= ~GICH_LR_PENDING_BIT;
 656
 657                 /*
 658                  * If there's no state left on the LR (it could still be
 659                  * active), then the LR does not hold any useful info and can
 660                  * be marked as free for other use.
 661                  */
 662                 if (!(*lr & GICH_LR_STATE))
 663                         vgic_retire_lr(i, irq, vgic_cpu);
 664
 665                 /* Finally update the VGIC state. */
 666                 vgic_update_state(vcpu->kvm);
 667         }
 668 }
 669
 670 /* Handle reads of GICD_CPENDSGIRn and GICD_SPENDSGIRn */
 671 static bool read_set_clear_sgi_pend_reg(struct kvm_vcpu *vcpu,
 672                                         struct kvm_exit_mmio *mmio,
 673                                         phys_addr_t offset)
 674 {
 675         struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
 676         int sgi;
 677         int min_sgi = (offset & ~0x3) * 4;
 678         int max_sgi = min_sgi + 3;
 679         int vcpu_id = vcpu->vcpu_id;
 680         u32 reg = 0;
 681
 682         /* Copy source SGIs from distributor side */
 683         for (sgi = min_sgi; sgi <= max_sgi; sgi++) {
 684                 int shift = 8 * (sgi - min_sgi);
 685                 reg |= (u32)dist->irq_sgi_sources[vcpu_id][sgi] << shift;
 686         }
 687
 688         mmio_data_write(mmio, ~0, reg);
 689         return false;
 690 }
 691
 692 static bool write_set_clear_sgi_pend_reg(struct kvm_vcpu *vcpu,
 693                                          struct kvm_exit_mmio *mmio,
 694                                          phys_addr_t offset, bool set)
 695 {
 696         struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
 697         int sgi;
 698         int min_sgi = (offset & ~0x3) * 4;
 699         int max_sgi = min_sgi + 3;
 700         int vcpu_id = vcpu->vcpu_id;
 701         u32 reg;
 702         bool updated = false;
 703
 704         reg = mmio_data_read(mmio, ~0);
 705
 706         /* Clear pending SGIs on the distributor */
 707         for (sgi = min_sgi; sgi <= max_sgi; sgi++) {
 708                 u8 mask = reg >> (8 * (sgi - min_sgi));
 709                 if (set) {
 710                         if ((dist->irq_sgi_sources[vcpu_id][sgi] & mask) != mask)
 711                                 updated = true;
 712                         dist->irq_sgi_sources[vcpu_id][sgi] |= mask;
 713                 } else {
 714                         if (dist->irq_sgi_sources[vcpu_id][sgi] & mask)
 715                                 updated = true;
 716                         dist->irq_sgi_sources[vcpu_id][sgi] &= ~mask;
 717                 }
 718         }
 719
 720         if (updated)
 721                 vgic_update_state(vcpu->kvm);
 722
 723         return updated;
 724 }
 725
 726 static bool handle_mmio_sgi_set(struct kvm_vcpu *vcpu,
 727                                 struct kvm_exit_mmio *mmio,
 728                                 phys_addr_t offset)
 729 {
 730         if (!mmio->is_write)
 731                 return read_set_clear_sgi_pend_reg(vcpu, mmio, offset);
 732         else
 733                 return write_set_clear_sgi_pend_reg(vcpu, mmio, offset, true);
 734 }
 735
 736 static bool handle_mmio_sgi_clear(struct kvm_vcpu *vcpu,
 737                                   struct kvm_exit_mmio *mmio,
 738                                   phys_addr_t offset)
 739 {
 740         if (!mmio->is_write)
 741                 return read_set_clear_sgi_pend_reg(vcpu, mmio, offset);
 742         else
 743                 return write_set_clear_sgi_pend_reg(vcpu, mmio, offset, false);
 744 }
 745
 746 /*
 747  * I would have liked to use the kvm_bus_io_*() API instead, but it
 748  * cannot cope with banked registers (only the VM pointer is passed
 749  * around, and we need the vcpu). One of these days, someone please
 750  * fix it!
 751  */
 752 struct mmio_range {
 753         phys_addr_t base;
 754         unsigned long len;
 755         bool (*handle_mmio)(struct kvm_vcpu *vcpu, struct kvm_exit_mmio *mmio,
 756                             phys_addr_t offset);
 757 };
 758
 759 static const struct mmio_range vgic_dist_ranges[] = {
 760         {
 761                 .base           = GIC_DIST_CTRL,
 762                 .len            = 12,
 763                 .handle_mmio    = handle_mmio_misc,
 764         },
 765         {
 766                 .base           = GIC_DIST_IGROUP,
 767                 .len            = VGIC_NR_IRQS / 8,
 768                 .handle_mmio    = handle_mmio_raz_wi,
 769         },
 770         {
 771                 .base           = GIC_DIST_ENABLE_SET,
 772                 .len            = VGIC_NR_IRQS / 8,
 773                 .handle_mmio    = handle_mmio_set_enable_reg,
 774         },
 775         {
 776                 .base           = GIC_DIST_ENABLE_CLEAR,
 777                 .len            = VGIC_NR_IRQS / 8,
 778                 .handle_mmio    = handle_mmio_clear_enable_reg,
 779         },
 780         {
 781                 .base           = GIC_DIST_PENDING_SET,
 782                 .len            = VGIC_NR_IRQS / 8,
 783                 .handle_mmio    = handle_mmio_set_pending_reg,
 784         },
 785         {
 786                 .base           = GIC_DIST_PENDING_CLEAR,
 787                 .len            = VGIC_NR_IRQS / 8,
 788                 .handle_mmio    = handle_mmio_clear_pending_reg,
 789         },
 790         {
 791                 .base           = GIC_DIST_ACTIVE_SET,
 792                 .len            = VGIC_NR_IRQS / 8,
 793                 .handle_mmio    = handle_mmio_raz_wi,
 794         },
 795         {
 796                 .base           = GIC_DIST_ACTIVE_CLEAR,
 797                 .len            = VGIC_NR_IRQS / 8,
 798                 .handle_mmio    = handle_mmio_raz_wi,
 799         },
 800         {
 801                 .base           = GIC_DIST_PRI,
 802                 .len            = VGIC_NR_IRQS,
 803                 .handle_mmio    = handle_mmio_priority_reg,
 804         },
 805         {
 806                 .base           = GIC_DIST_TARGET,
 807                 .len            = VGIC_NR_IRQS,
 808                 .handle_mmio    = handle_mmio_target_reg,
 809         },
 810         {
 811                 .base           = GIC_DIST_CONFIG,
 812                 .len            = VGIC_NR_IRQS / 4,
 813                 .handle_mmio    = handle_mmio_cfg_reg,
 814         },
 815         {
 816                 .base           = GIC_DIST_SOFTINT,
 817                 .len            = 4,
 818                 .handle_mmio    = handle_mmio_sgi_reg,
 819         },
 820         {
 821                 .base           = GIC_DIST_SGI_PENDING_CLEAR,
 822                 .len            = VGIC_NR_SGIS,
 823                 .handle_mmio    = handle_mmio_sgi_clear,
 824         },
 825         {
 826                 .base           = GIC_DIST_SGI_PENDING_SET,
 827                 .len            = VGIC_NR_SGIS,
 828                 .handle_mmio    = handle_mmio_sgi_set,
 829         },
 830         {}
 831 };
 832
 833 static const
 834 struct mmio_range *find_matching_range(const struct mmio_range *ranges,
 835                                        struct kvm_exit_mmio *mmio,
 836                                        phys_addr_t offset)
 837 {
 838         const struct mmio_range *r = ranges;
 839
 840         while (r->len) {
 841                 if (offset >= r->base &&
 842                     (offset + mmio->len) <= (r->base + r->len))
 843                         return r;
 844                 r++;
 845         }
 846
 847         return NULL;
 848 }
 849
 850 /**
 851  * vgic_handle_mmio - handle an in-kernel MMIO access
 852  * @vcpu:       pointer to the vcpu performing the access
 853  * @run:        pointer to the kvm_run structure
 854  * @mmio:       pointer to the data describing the access
 855  *
 856  * returns true if the MMIO access has been performed in kernel space,
 857  * and false if it needs to be emulated in user space.
 858  */
 859 bool vgic_handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run,
 860                       struct kvm_exit_mmio *mmio)
 861 {
 862         const struct mmio_range *range;
 863         struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
 864         unsigned long base = dist->vgic_dist_base;
 865         bool updated_state;
 866         unsigned long offset;
 867
 868         if (!irqchip_in_kernel(vcpu->kvm) ||
 869             mmio->phys_addr < base ||
 870             (mmio->phys_addr + mmio->len) > (base + KVM_VGIC_V2_DIST_SIZE))
 871                 return false;
 872
 873         /* We don't support ldrd / strd or ldm / stm to the emulated vgic */
 874         if (mmio->len > 4) {
 875                 kvm_inject_dabt(vcpu, mmio->phys_addr);
 876                 return true;
 877         }
 878
 879         offset = mmio->phys_addr - base;
 880         range = find_matching_range(vgic_dist_ranges, mmio, offset);
 881         if (unlikely(!range || !range->handle_mmio)) {
 882                 pr_warn("Unhandled access %d %08llx %d\n",
 883                         mmio->is_write, mmio->phys_addr, mmio->len);
 884                 return false;
 885         }
 886
 887         spin_lock(&vcpu->kvm->arch.vgic.lock);
 888         offset = mmio->phys_addr - range->base - base;
 889         updated_state = range->handle_mmio(vcpu, mmio, offset);
 890         spin_unlock(&vcpu->kvm->arch.vgic.lock);
 891         kvm_prepare_mmio(run, mmio);
 892         kvm_handle_mmio_return(vcpu, run);
 893
 894         if (updated_state)
 895                 vgic_kick_vcpus(vcpu->kvm);
 896
 897         return true;
 898 }
 899
 900 static void vgic_dispatch_sgi(struct kvm_vcpu *vcpu, u32 reg)
 901 {
 902         struct kvm *kvm = vcpu->kvm;
 903         struct vgic_dist *dist = &kvm->arch.vgic;
 904         int nrcpus = atomic_read(&kvm->online_vcpus);
 905         u8 target_cpus;
 906         int sgi, mode, c, vcpu_id;
 907
 908         vcpu_id = vcpu->vcpu_id;
 909
 910         sgi = reg & 0xf;
 911         target_cpus = (reg >> 16) & 0xff;
 912         mode = (reg >> 24) & 3;
 913
 914         switch (mode) {
 915         case 0:
 916                 if (!target_cpus)
 917                         return;
 918                 break;
 919
 920         case 1:
 921                 target_cpus = ((1 << nrcpus) - 1) & ~(1 << vcpu_id) & 0xff;
 922                 break;
 923
 924         case 2:
 925                 target_cpus = 1 << vcpu_id;
 926                 break;
 927         }
 928
 929         kvm_for_each_vcpu(c, vcpu, kvm) {
 930                 if (target_cpus & 1) {
 931                         /* Flag the SGI as pending */
 932                         vgic_dist_irq_set(vcpu, sgi);
 933                         dist->irq_sgi_sources[c][sgi] |= 1 << vcpu_id;
 934                         kvm_debug("SGI%d from CPU%d to CPU%d\n", sgi, vcpu_id, c);
 935                 }
 936
 937                 target_cpus >>= 1;
 938         }
 939 }
 940
 941 static int compute_pending_for_cpu(struct kvm_vcpu *vcpu)
 942 {
 943         struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
 944         unsigned long *pending, *enabled, *pend_percpu, *pend_shared;
 945         unsigned long pending_private, pending_shared;
 946         int vcpu_id;
 947
 948         vcpu_id = vcpu->vcpu_id;
 949         pend_percpu = vcpu->arch.vgic_cpu.pending_percpu;
 950         pend_shared = vcpu->arch.vgic_cpu.pending_shared;
 951
 952         pending = vgic_bitmap_get_cpu_map(&dist->irq_state, vcpu_id);
 953         enabled = vgic_bitmap_get_cpu_map(&dist->irq_enabled, vcpu_id);
 954         bitmap_and(pend_percpu, pending, enabled, VGIC_NR_PRIVATE_IRQS);
 955
 956         pending = vgic_bitmap_get_shared_map(&dist->irq_state);
 957         enabled = vgic_bitmap_get_shared_map(&dist->irq_enabled);
 958         bitmap_and(pend_shared, pending, enabled, VGIC_NR_SHARED_IRQS);
 959         bitmap_and(pend_shared, pend_shared,
 960                    vgic_bitmap_get_shared_map(&dist->irq_spi_target[vcpu_id]),
 961                    VGIC_NR_SHARED_IRQS);
 962
 963         pending_private = find_first_bit(pend_percpu, VGIC_NR_PRIVATE_IRQS);
 964         pending_shared = find_first_bit(pend_shared, VGIC_NR_SHARED_IRQS);
 965         return (pending_private < VGIC_NR_PRIVATE_IRQS ||
 966                 pending_shared < VGIC_NR_SHARED_IRQS);
 967 }
 968
 969 /*
 970  * Update the interrupt state and determine which CPUs have pending
 971  * interrupts. Must be called with distributor lock held.
 972  */
 973 static void vgic_update_state(struct kvm *kvm)
 974 {
 975         struct vgic_dist *dist = &kvm->arch.vgic;
 976         struct kvm_vcpu *vcpu;
 977         int c;
 978
 979         if (!dist->enabled) {
 980                 set_bit(0, &dist->irq_pending_on_cpu);
 981                 return;
 982         }
 983
 984         kvm_for_each_vcpu(c, vcpu, kvm) {
 985                 if (compute_pending_for_cpu(vcpu)) {
 986                         pr_debug("CPU%d has pending interrupts\n", c);
 987                         set_bit(c, &dist->irq_pending_on_cpu);
 988                 }
 989         }
 990 }
 991
 992 #define MK_LR_PEND(src, irq)    \
 993         (GICH_LR_PENDING_BIT | ((src) << GICH_LR_PHYSID_CPUID_SHIFT) | (irq))
 994
 995 /*
 996  * An interrupt may have been disabled after being made pending on the
 997  * CPU interface (the classic case is a timer running while we're
 998  * rebooting the guest - the interrupt would kick as soon as the CPU
 999  * interface gets enabled, with deadly consequences).
1000  *
1001  * The solution is to examine already active LRs, and check the
1002  * interrupt is still enabled. If not, just retire it.
1003  */
1004 static void vgic_retire_disabled_irqs(struct kvm_vcpu *vcpu)
1005 {
1006         struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
1007         int lr;
1008
1009         for_each_set_bit(lr, vgic_cpu->lr_used, vgic_cpu->nr_lr) {
1010                 int irq = vgic_cpu->vgic_lr[lr] & GICH_LR_VIRTUALID;
1011
1012                 if (!vgic_irq_is_enabled(vcpu, irq)) {
1013                         vgic_retire_lr(lr, irq, vgic_cpu);
1014                         if (vgic_irq_is_active(vcpu, irq))
1015                                 vgic_irq_clear_active(vcpu, irq);
1016                 }
1017         }
1018 }
1019
1020 /*
1021  * Queue an interrupt to a CPU virtual interface. Return true on success,
1022  * or false if it wasn't possible to queue it.
1023  */
1024 static bool vgic_queue_irq(struct kvm_vcpu *vcpu, u8 sgi_source_id, int irq)
1025 {
1026         struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
1027         int lr;
1028
1029         /* Sanitize the input... */
1030         BUG_ON(sgi_source_id & ~7);
1031         BUG_ON(sgi_source_id && irq >= VGIC_NR_SGIS);
1032         BUG_ON(irq >= VGIC_NR_IRQS);
1033
1034         kvm_debug("Queue IRQ%d\n", irq);
1035
1036         lr = vgic_cpu->vgic_irq_lr_map[irq];
1037
1038         /* Do we have an active interrupt for the same CPUID? */
1039         if (lr != LR_EMPTY &&
1040             (LR_CPUID(vgic_cpu->vgic_lr[lr]) == sgi_source_id)) {
1041                 kvm_debug("LR%d piggyback for IRQ%d %x\n",
1042                           lr, irq, vgic_cpu->vgic_lr[lr]);
1043                 BUG_ON(!test_bit(lr, vgic_cpu->lr_used));
1044                 vgic_cpu->vgic_lr[lr] |= GICH_LR_PENDING_BIT;
1045                 return true;
1046         }
1047
1048         /* Try to use another LR for this interrupt */
1049         lr = find_first_zero_bit((unsigned long *)vgic_cpu->lr_used,
1050                                vgic_cpu->nr_lr);
1051         if (lr >= vgic_cpu->nr_lr)
1052                 return false;
1053
1054         kvm_debug("LR%d allocated for IRQ%d %x\n", lr, irq, sgi_source_id);
1055         vgic_cpu->vgic_lr[lr] = MK_LR_PEND(sgi_source_id, irq);
1056         vgic_cpu->vgic_irq_lr_map[irq] = lr;
1057         set_bit(lr, vgic_cpu->lr_used);
1058
1059         if (!vgic_irq_is_edge(vcpu, irq))
1060                 vgic_cpu->vgic_lr[lr] |= GICH_LR_EOI;
1061
1062         return true;
1063 }
1064
1065 static bool vgic_queue_sgi(struct kvm_vcpu *vcpu, int irq)
1066 {
1067         struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
1068         unsigned long sources;
1069         int vcpu_id = vcpu->vcpu_id;
1070         int c;
1071
1072         sources = dist->irq_sgi_sources[vcpu_id][irq];
1073
1074         for_each_set_bit(c, &sources, VGIC_MAX_CPUS) {
1075                 if (vgic_queue_irq(vcpu, c, irq))
1076                         clear_bit(c, &sources);
1077         }
1078
1079         dist->irq_sgi_sources[vcpu_id][irq] = sources;
1080
1081         /*
1082          * If the sources bitmap has been cleared it means that we
1083          * could queue all the SGIs onto link registers (see the
1084          * clear_bit above), and therefore we are done with them in
1085          * our emulated gic and can get rid of them.
1086          */
1087         if (!sources) {
1088                 vgic_dist_irq_clear(vcpu, irq);
1089                 vgic_cpu_irq_clear(vcpu, irq);
1090                 return true;
1091         }
1092
1093         return false;
1094 }
1095
1096 static bool vgic_queue_hwirq(struct kvm_vcpu *vcpu, int irq)
1097 {
1098         if (vgic_irq_is_active(vcpu, irq))
1099                 return true; /* level interrupt, already queued */
1100
1101         if (vgic_queue_irq(vcpu, 0, irq)) {
1102                 if (vgic_irq_is_edge(vcpu, irq)) {
1103                         vgic_dist_irq_clear(vcpu, irq);
1104                         vgic_cpu_irq_clear(vcpu, irq);
1105                 } else {
1106                         vgic_irq_set_active(vcpu, irq);
1107                 }
1108
1109                 return true;
1110         }
1111
1112         return false;
1113 }
1114
1115 /*
1116  * Fill the list registers with pending interrupts before running the
1117  * guest.
1118  */
1119 static void __kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu)
1120 {
1121         struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
1122         struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
1123         int i, vcpu_id;
1124         int overflow = 0;
1125
1126         vcpu_id = vcpu->vcpu_id;
1127
1128         /*
1129          * We may not have any pending interrupt, or the interrupts
1130          * may have been serviced from another vcpu. In all cases,
1131          * move along.
1132          */
1133         if (!kvm_vgic_vcpu_pending_irq(vcpu)) {
1134                 pr_debug("CPU%d has no pending interrupt\n", vcpu_id);
1135                 goto epilog;
1136         }
1137
1138         /* SGIs */
1139         for_each_set_bit(i, vgic_cpu->pending_percpu, VGIC_NR_SGIS) {
1140                 if (!vgic_queue_sgi(vcpu, i))
1141                         overflow = 1;
1142         }
1143
1144         /* PPIs */
1145         for_each_set_bit_from(i, vgic_cpu->pending_percpu, VGIC_NR_PRIVATE_IRQS) {
1146                 if (!vgic_queue_hwirq(vcpu, i))
1147                         overflow = 1;
1148         }
1149
1150         /* SPIs */
1151         for_each_set_bit(i, vgic_cpu->pending_shared, VGIC_NR_SHARED_IRQS) {
1152                 if (!vgic_queue_hwirq(vcpu, i + VGIC_NR_PRIVATE_IRQS))
1153                         overflow = 1;
1154         }
1155
1156 epilog:
1157         if (overflow) {
1158                 vgic_cpu->vgic_hcr |= GICH_HCR_UIE;
1159         } else {
1160                 vgic_cpu->vgic_hcr &= ~GICH_HCR_UIE;
1161                 /*
1162                  * We're about to run this VCPU, and we've consumed
1163                  * everything the distributor had in store for
1164                  * us. Claim we don't have anything pending. We'll
1165                  * adjust that if needed while exiting.
1166                  */
1167                 clear_bit(vcpu_id, &dist->irq_pending_on_cpu);
1168         }
1169 }
1170
1171 static bool vgic_process_maintenance(struct kvm_vcpu *vcpu)
1172 {
1173         struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
1174         bool level_pending = false;
1175
1176         kvm_debug("MISR = %08x\n", vgic_cpu->vgic_misr);
1177
1178         if (vgic_cpu->vgic_misr & GICH_MISR_EOI) {
1179                 /*
1180                  * Some level interrupts have been EOIed. Clear their
1181                  * active bit.
1182                  */
1183                 int lr, irq;
1184
1185                 for_each_set_bit(lr, (unsigned long *)vgic_cpu->vgic_eisr,
1186                                  vgic_cpu->nr_lr) {
1187                         irq = vgic_cpu->vgic_lr[lr] & GICH_LR_VIRTUALID;
1188
1189                         vgic_irq_clear_active(vcpu, irq);
1190                         vgic_cpu->vgic_lr[lr] &= ~GICH_LR_EOI;
1191
1192                         /* Any additional pending interrupt? */
1193                         if (vgic_dist_irq_is_pending(vcpu, irq)) {
1194                                 vgic_cpu_irq_set(vcpu, irq);
1195                                 level_pending = true;
1196                         } else {
1197                                 vgic_cpu_irq_clear(vcpu, irq);
1198                         }
1199
1200                         /*
1201                          * Despite being EOIed, the LR may not have
1202                          * been marked as empty.
1203                          */
1204                         set_bit(lr, (unsigned long *)vgic_cpu->vgic_elrsr);
1205                         vgic_cpu->vgic_lr[lr] &= ~GICH_LR_ACTIVE_BIT;
1206                 }
1207         }
1208
1209         if (vgic_cpu->vgic_misr & GICH_MISR_U)
1210                 vgic_cpu->vgic_hcr &= ~GICH_HCR_UIE;
1211
1212         return level_pending;
1213 }
1214
1215 /*
1216  * Sync back the VGIC state after a guest run. The distributor lock is
1217  * needed so we don't get preempted in the middle of the state processing.
1218  */
1219 static void __kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu)
1220 {
1221         struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
1222         struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
1223         int lr, pending;
1224         bool level_pending;
1225
1226         level_pending = vgic_process_maintenance(vcpu);
1227
1228         /* Clear mappings for empty LRs */
1229         for_each_set_bit(lr, (unsigned long *)vgic_cpu->vgic_elrsr,
1230                          vgic_cpu->nr_lr) {
1231                 int irq;
1232
1233                 if (!test_and_clear_bit(lr, vgic_cpu->lr_used))
1234                         continue;
1235
1236                 irq = vgic_cpu->vgic_lr[lr] & GICH_LR_VIRTUALID;
1237
1238                 BUG_ON(irq >= VGIC_NR_IRQS);
1239                 vgic_cpu->vgic_irq_lr_map[irq] = LR_EMPTY;
1240         }
1241
1242         /* Check if we still have something up our sleeve... */
1243         pending = find_first_zero_bit((unsigned long *)vgic_cpu->vgic_elrsr,
1244                                       vgic_cpu->nr_lr);
1245         if (level_pending || pending < vgic_cpu->nr_lr)
1246                 set_bit(vcpu->vcpu_id, &dist->irq_pending_on_cpu);
1247 }
1248
1249 void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu)
1250 {
1251         struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
1252
1253         if (!irqchip_in_kernel(vcpu->kvm))
1254                 return;
1255
1256         spin_lock(&dist->lock);
1257         __kvm_vgic_flush_hwstate(vcpu);
1258         spin_unlock(&dist->lock);
1259 }
1260
1261 void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu)
1262 {
1263         struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
1264
1265         if (!irqchip_in_kernel(vcpu->kvm))
1266                 return;
1267
1268         spin_lock(&dist->lock);
1269         __kvm_vgic_sync_hwstate(vcpu);
1270         spin_unlock(&dist->lock);
1271 }
1272
1273 int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu)
1274 {
1275         struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
1276
1277         if (!irqchip_in_kernel(vcpu->kvm))
1278                 return 0;
1279
1280         return test_bit(vcpu->vcpu_id, &dist->irq_pending_on_cpu);
1281 }
1282
1283 static void vgic_kick_vcpus(struct kvm *kvm)
1284 {
1285         struct kvm_vcpu *vcpu;
1286         int c;
1287
1288         /*
1289          * We've injected an interrupt, time to find out who deserves
1290          * a good kick...
1291          */
1292         kvm_for_each_vcpu(c, vcpu, kvm) {
1293                 if (kvm_vgic_vcpu_pending_irq(vcpu))
1294                         kvm_vcpu_kick(vcpu);
1295         }
1296 }
1297
1298 static int vgic_validate_injection(struct kvm_vcpu *vcpu, int irq, int level)
1299 {
1300         int is_edge = vgic_irq_is_edge(vcpu, irq);
1301         int state = vgic_dist_irq_is_pending(vcpu, irq);
1302
1303         /*
1304          * Only inject an interrupt if:
1305          * - edge triggered and we have a rising edge
1306          * - level triggered and we change level
1307          */
1308         if (is_edge)
1309                 return level > state;
1310         else
1311                 return level != state;
1312 }
1313
1314 static bool vgic_update_irq_state(struct kvm *kvm, int cpuid,
1315                                   unsigned int irq_num, bool level)
1316 {
1317         struct vgic_dist *dist = &kvm->arch.vgic;
1318         struct kvm_vcpu *vcpu;
1319         int is_edge, is_level;
1320         int enabled;
1321         bool ret = true;
1322
1323         spin_lock(&dist->lock);
1324
1325         vcpu = kvm_get_vcpu(kvm, cpuid);
1326         is_edge = vgic_irq_is_edge(vcpu, irq_num);
1327         is_level = !is_edge;
1328
1329         if (!vgic_validate_injection(vcpu, irq_num, level)) {
1330                 ret = false;
1331                 goto out;
1332         }
1333
1334         if (irq_num >= VGIC_NR_PRIVATE_IRQS) {
1335                 cpuid = dist->irq_spi_cpu[irq_num - VGIC_NR_PRIVATE_IRQS];
1336                 vcpu = kvm_get_vcpu(kvm, cpuid);
1337         }
1338
1339         kvm_debug("Inject IRQ%d level %d CPU%d\n", irq_num, level, cpuid);
1340
1341         if (level)
1342                 vgic_dist_irq_set(vcpu, irq_num);
1343         else
1344                 vgic_dist_irq_clear(vcpu, irq_num);
1345
1346         enabled = vgic_irq_is_enabled(vcpu, irq_num);
1347
1348         if (!enabled) {
1349                 ret = false;
1350                 goto out;
1351         }
1352
1353         if (is_level && vgic_irq_is_active(vcpu, irq_num)) {
1354                 /*
1355                  * Level interrupt in progress, will be picked up
1356                  * when EOId.
1357                  */
1358                 ret = false;
1359                 goto out;
1360         }
1361
1362         if (level) {
1363                 vgic_cpu_irq_set(vcpu, irq_num);
1364                 set_bit(cpuid, &dist->irq_pending_on_cpu);
1365         }
1366
1367 out:
1368         spin_unlock(&dist->lock);
1369
1370         return ret;
1371 }
1372
1373 /**
1374  * kvm_vgic_inject_irq - Inject an IRQ from a device to the vgic
1375  * @kvm:     The VM structure pointer
1376  * @cpuid:   The CPU for PPIs
1377  * @irq_num: The IRQ number that is assigned to the device
1378  * @level:   Edge-triggered:  true:  to trigger the interrupt
1379  *                            false: to ignore the call
1380  *           Level-sensitive  true:  activates an interrupt
1381  *                            false: deactivates an interrupt
1382  *
1383  * The GIC is not concerned with devices being active-LOW or active-HIGH for
1384  * level-sensitive interrupts.  You can think of the level parameter as 1
1385  * being HIGH and 0 being LOW and all devices being active-HIGH.
1386  */
1387 int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int irq_num,
1388                         bool level)
1389 {
1390         if (vgic_update_irq_state(kvm, cpuid, irq_num, level))
1391                 vgic_kick_vcpus(kvm);
1392
1393         return 0;
1394 }
1395
1396 static irqreturn_t vgic_maintenance_handler(int irq, void *data)
1397 {
1398         /*
1399          * We cannot rely on the vgic maintenance interrupt to be
1400          * delivered synchronously. This means we can only use it to
1401          * exit the VM, and we perform the handling of EOIed
1402          * interrupts on the exit path (see vgic_process_maintenance).
1403          */
1404         return IRQ_HANDLED;
1405 }
1406
1407 /**
1408  * kvm_vgic_vcpu_init - Initialize per-vcpu VGIC state
1409  * @vcpu: pointer to the vcpu struct
1410  *
1411  * Initialize the vgic_cpu struct and vgic_dist struct fields pertaining to
1412  * this vcpu and enable the VGIC for this VCPU
1413  */
1414 int kvm_vgic_vcpu_init(struct kvm_vcpu *vcpu)
1415 {
1416         struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
1417         struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
1418         int i;
1419
1420         if (vcpu->vcpu_id >= VGIC_MAX_CPUS)
1421                 return -EBUSY;
1422
1423         for (i = 0; i < VGIC_NR_IRQS; i++) {
1424                 if (i < VGIC_NR_PPIS)
1425                         vgic_bitmap_set_irq_val(&dist->irq_enabled,
1426                                                 vcpu->vcpu_id, i, 1);
1427                 if (i < VGIC_NR_PRIVATE_IRQS)
1428                         vgic_bitmap_set_irq_val(&dist->irq_cfg,
1429                                                 vcpu->vcpu_id, i, VGIC_CFG_EDGE);
1430
1431                 vgic_cpu->vgic_irq_lr_map[i] = LR_EMPTY;
1432         }
1433
1434         /*
1435          * By forcing VMCR to zero, the GIC will restore the binary
1436          * points to their reset values. Anything else resets to zero
1437          * anyway.
1438          */
1439         vgic_cpu->vgic_vmcr = 0;
1440
1441         vgic_cpu->nr_lr = vgic_nr_lr;
1442         vgic_cpu->vgic_hcr = GICH_HCR_EN; /* Get the show on the road... */
1443
1444         return 0;
1445 }
1446
1447 static void vgic_init_maintenance_interrupt(void *info)
1448 {
1449         enable_percpu_irq(vgic_maint_irq, 0);
1450 }
1451
1452 static int vgic_cpu_notify(struct notifier_block *self,
1453                            unsigned long action, void *cpu)
1454 {
1455         switch (action) {
1456         case CPU_STARTING:
1457         case CPU_STARTING_FROZEN:
1458                 vgic_init_maintenance_interrupt(NULL);
1459                 break;
1460         case CPU_DYING:
1461         case CPU_DYING_FROZEN:
1462                 disable_percpu_irq(vgic_maint_irq);
1463                 break;
1464         }
1465
1466         return NOTIFY_OK;
1467 }
1468
1469 static struct notifier_block vgic_cpu_nb = {
1470         .notifier_call = vgic_cpu_notify,
1471 };
1472
1473 int kvm_vgic_hyp_init(void)
1474 {
1475         int ret;
1476         struct resource vctrl_res;
1477         struct resource vcpu_res;
1478
1479         vgic_node = of_find_compatible_node(NULL, NULL, "arm,cortex-a15-gic");
1480         if (!vgic_node) {
1481                 kvm_err("error: no compatible vgic node in DT\n");
1482                 return -ENODEV;
1483         }
1484
1485         vgic_maint_irq = irq_of_parse_and_map(vgic_node, 0);
1486         if (!vgic_maint_irq) {
1487                 kvm_err("error getting vgic maintenance irq from DT\n");
1488                 ret = -ENXIO;
1489                 goto out;
1490         }
1491
1492         ret = request_percpu_irq(vgic_maint_irq, vgic_maintenance_handler,
1493                                  "vgic", kvm_get_running_vcpus());
1494         if (ret) {
1495                 kvm_err("Cannot register interrupt %d\n", vgic_maint_irq);
1496                 goto out;
1497         }
1498
1499         ret = __register_cpu_notifier(&vgic_cpu_nb);
1500         if (ret) {
1501                 kvm_err("Cannot register vgic CPU notifier\n");
1502                 goto out_free_irq;
1503         }
1504
1505         ret = of_address_to_resource(vgic_node, 2, &vctrl_res);
1506         if (ret) {
1507                 kvm_err("Cannot obtain VCTRL resource\n");
1508                 goto out_free_irq;
1509         }
1510
1511         vgic_vctrl_base = of_iomap(vgic_node, 2);
1512         if (!vgic_vctrl_base) {
1513                 kvm_err("Cannot ioremap VCTRL\n");
1514                 ret = -ENOMEM;
1515                 goto out_free_irq;
1516         }
1517
1518         vgic_nr_lr = readl_relaxed(vgic_vctrl_base + GICH_VTR);
1519         vgic_nr_lr = (vgic_nr_lr & 0x3f) + 1;
1520
1521         ret = create_hyp_io_mappings(vgic_vctrl_base,
1522                                      vgic_vctrl_base + resource_size(&vctrl_res),
1523                                      vctrl_res.start);
1524         if (ret) {
1525                 kvm_err("Cannot map VCTRL into hyp\n");
1526                 goto out_unmap;
1527         }
1528
1529         if (of_address_to_resource(vgic_node, 3, &vcpu_res)) {
1530                 kvm_err("Cannot obtain VCPU resource\n");
1531                 ret = -ENXIO;
1532                 goto out_unmap;
1533         }
1534
1535         if (!PAGE_ALIGNED(vcpu_res.start)) {
1536                 kvm_err("GICV physical address 0x%llx not page aligned\n",
1537                         (unsigned long long)vcpu_res.start);
1538                 ret = -ENXIO;
1539                 goto out_unmap;
1540         }
1541
1542         if (!PAGE_ALIGNED(resource_size(&vcpu_res))) {
1543                 kvm_err("GICV size 0x%llx not a multiple of page size 0x%lx\n",
1544                         (unsigned long long)resource_size(&vcpu_res),
1545                         PAGE_SIZE);
1546                 ret = -ENXIO;
1547                 goto out_unmap;
1548         }
1549
1550         vgic_vcpu_base = vcpu_res.start;
1551
1552         kvm_info("%s@%llx IRQ%d\n", vgic_node->name,
1553                  vctrl_res.start, vgic_maint_irq);
1554         on_each_cpu(vgic_init_maintenance_interrupt, NULL, 1);
1555
1556         goto out;
1557
1558 out_unmap:
1559         iounmap(vgic_vctrl_base);
1560 out_free_irq:
1561         free_percpu_irq(vgic_maint_irq, kvm_get_running_vcpus());
1562 out:
1563         of_node_put(vgic_node);
1564         return ret;
1565 }
1566
1567 /**
1568  * kvm_vgic_init - Initialize global VGIC state before running any VCPUs
1569  * @kvm: pointer to the kvm struct
1570  *
1571  * Map the virtual CPU interface into the VM before running any VCPUs.  We
1572  * can't do this at creation time, because user space must first set the
1573  * virtual CPU interface address in the guest physical address space.  Also
1574  * initialize the ITARGETSRn regs to 0 on the emulated distributor.
1575  */
1576 int kvm_vgic_init(struct kvm *kvm)
1577 {
1578         int ret = 0, i;
1579
1580         if (!irqchip_in_kernel(kvm))
1581                 return 0;
1582
1583         mutex_lock(&kvm->lock);
1584
1585         if (vgic_initialized(kvm))
1586                 goto out;
1587
1588         if (IS_VGIC_ADDR_UNDEF(kvm->arch.vgic.vgic_dist_base) ||
1589             IS_VGIC_ADDR_UNDEF(kvm->arch.vgic.vgic_cpu_base)) {
1590                 kvm_err("Need to set vgic cpu and dist addresses first\n");
1591                 ret = -ENXIO;
1592                 goto out;
1593         }
1594
1595         ret = kvm_phys_addr_ioremap(kvm, kvm->arch.vgic.vgic_cpu_base,
1596                                     vgic_vcpu_base, KVM_VGIC_V2_CPU_SIZE);
1597         if (ret) {
1598                 kvm_err("Unable to remap VGIC CPU to VCPU\n");
1599                 goto out;
1600         }
1601
1602         for (i = VGIC_NR_PRIVATE_IRQS; i < VGIC_NR_IRQS; i += 4)
1603                 vgic_set_target_reg(kvm, 0, i);
1604
1605         kvm->arch.vgic.ready = true;
1606 out:
1607         mutex_unlock(&kvm->lock);
1608         return ret;
1609 }
1610
1611 int kvm_vgic_create(struct kvm *kvm)
1612 {
1613         int i, vcpu_lock_idx = -1, ret = 0;
1614         struct kvm_vcpu *vcpu;
1615
1616         mutex_lock(&kvm->lock);
1617
1618         if (kvm->arch.vgic.vctrl_base) {
1619                 ret = -EEXIST;
1620                 goto out;
1621         }
1622
1623         /*
1624          * Any time a vcpu is run, vcpu_load is called which tries to grab the
1625          * vcpu->mutex.  By grabbing the vcpu->mutex of all VCPUs we ensure
1626          * that no other VCPUs are run while we create the vgic.
1627          */
1628         kvm_for_each_vcpu(i, vcpu, kvm) {
1629                 if (!mutex_trylock(&vcpu->mutex))
1630                         goto out_unlock;
1631                 vcpu_lock_idx = i;
1632         }
1633
1634         kvm_for_each_vcpu(i, vcpu, kvm) {
1635                 if (vcpu->arch.has_run_once) {
1636                         ret = -EBUSY;
1637                         goto out_unlock;
1638                 }
1639         }
1640
1641         spin_lock_init(&kvm->arch.vgic.lock);
1642         kvm->arch.vgic.vctrl_base = vgic_vctrl_base;
1643         kvm->arch.vgic.vgic_dist_base = VGIC_ADDR_UNDEF;
1644         kvm->arch.vgic.vgic_cpu_base = VGIC_ADDR_UNDEF;
1645
1646 out_unlock:
1647         for (; vcpu_lock_idx >= 0; vcpu_lock_idx--) {
1648                 vcpu = kvm_get_vcpu(kvm, vcpu_lock_idx);
1649                 mutex_unlock(&vcpu->mutex);
1650         }
1651
1652 out:
1653         mutex_unlock(&kvm->lock);
1654         return ret;
1655 }
1656
1657 static bool vgic_ioaddr_overlap(struct kvm *kvm)
1658 {
1659         phys_addr_t dist = kvm->arch.vgic.vgic_dist_base;
1660         phys_addr_t cpu = kvm->arch.vgic.vgic_cpu_base;
1661
1662         if (IS_VGIC_ADDR_UNDEF(dist) || IS_VGIC_ADDR_UNDEF(cpu))
1663                 return 0;
1664         if ((dist <= cpu && dist + KVM_VGIC_V2_DIST_SIZE > cpu) ||
1665             (cpu <= dist && cpu + KVM_VGIC_V2_CPU_SIZE > dist))
1666                 return -EBUSY;
1667         return 0;
1668 }
1669
1670 static int vgic_ioaddr_assign(struct kvm *kvm, phys_addr_t *ioaddr,
1671                               phys_addr_t addr, phys_addr_t size)
1672 {
1673         int ret;
1674
1675         if (addr & ~KVM_PHYS_MASK)
1676                 return -E2BIG;
1677
1678         if (addr & (SZ_4K - 1))
1679                 return -EINVAL;
1680
1681         if (!IS_VGIC_ADDR_UNDEF(*ioaddr))
1682                 return -EEXIST;
1683         if (addr + size < addr)
1684                 return -EINVAL;
1685
1686         *ioaddr = addr;
1687         ret = vgic_ioaddr_overlap(kvm);
1688         if (ret)
1689                 *ioaddr = VGIC_ADDR_UNDEF;
1690
1691         return ret;
1692 }
1693
1694 /**
1695  * kvm_vgic_addr - set or get vgic VM base addresses
1696  * @kvm:   pointer to the vm struct
1697  * @type:  the VGIC addr type, one of KVM_VGIC_V2_ADDR_TYPE_XXX
1698  * @addr:  pointer to address value
1699  * @write: if true set the address in the VM address space, if false read the
1700  *          address
1701  *
1702  * Set or get the vgic base addresses for the distributor and the virtual CPU
1703  * interface in the VM physical address space.  These addresses are properties
1704  * of the emulated core/SoC and therefore user space initially knows this
1705  * information.
1706  */
1707 int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write)
1708 {
1709         int r = 0;
1710         struct vgic_dist *vgic = &kvm->arch.vgic;
1711
1712         mutex_lock(&kvm->lock);
1713         switch (type) {
1714         case KVM_VGIC_V2_ADDR_TYPE_DIST:
1715                 if (write) {
1716                         r = vgic_ioaddr_assign(kvm, &vgic->vgic_dist_base,
1717                                                *addr, KVM_VGIC_V2_DIST_SIZE);
1718                 } else {
1719                         *addr = vgic->vgic_dist_base;
1720                 }
1721                 break;
1722         case KVM_VGIC_V2_ADDR_TYPE_CPU:
1723                 if (write) {
1724                         r = vgic_ioaddr_assign(kvm, &vgic->vgic_cpu_base,
1725                                                *addr, KVM_VGIC_V2_CPU_SIZE);
1726                 } else {
1727                         *addr = vgic->vgic_cpu_base;
1728                 }
1729                 break;
1730         default:
1731                 r = -ENODEV;
1732         }
1733
1734         mutex_unlock(&kvm->lock);
1735         return r;
1736 }
1737
1738 static bool handle_cpu_mmio_misc(struct kvm_vcpu *vcpu,
1739                                  struct kvm_exit_mmio *mmio, phys_addr_t offset)
1740 {
1741         struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
1742         u32 reg, mask = 0, shift = 0;
1743         bool updated = false;
1744
1745         switch (offset & ~0x3) {
1746         case GIC_CPU_CTRL:
1747                 mask = GICH_VMCR_CTRL_MASK;
1748                 shift = GICH_VMCR_CTRL_SHIFT;
1749                 break;
1750         case GIC_CPU_PRIMASK:
1751                 mask = GICH_VMCR_PRIMASK_MASK;
1752                 shift = GICH_VMCR_PRIMASK_SHIFT;
1753                 break;
1754         case GIC_CPU_BINPOINT:
1755                 mask = GICH_VMCR_BINPOINT_MASK;
1756                 shift = GICH_VMCR_BINPOINT_SHIFT;
1757                 break;
1758         case GIC_CPU_ALIAS_BINPOINT:
1759                 mask = GICH_VMCR_ALIAS_BINPOINT_MASK;
1760                 shift = GICH_VMCR_ALIAS_BINPOINT_SHIFT;
1761                 break;
1762         }
1763
1764         if (!mmio->is_write) {
1765                 reg = (vgic_cpu->vgic_vmcr & mask) >> shift;
1766                 mmio_data_write(mmio, ~0, reg);
1767         } else {
1768                 reg = mmio_data_read(mmio, ~0);
1769                 reg = (reg << shift) & mask;
1770                 if (reg != (vgic_cpu->vgic_vmcr & mask))
1771                         updated = true;
1772                 vgic_cpu->vgic_vmcr &= ~mask;
1773                 vgic_cpu->vgic_vmcr |= reg;
1774         }
1775         return updated;
1776 }
1777
1778 static bool handle_mmio_abpr(struct kvm_vcpu *vcpu,
1779                              struct kvm_exit_mmio *mmio, phys_addr_t offset)
1780 {
1781         return handle_cpu_mmio_misc(vcpu, mmio, GIC_CPU_ALIAS_BINPOINT);
1782 }
1783
1784 static bool handle_cpu_mmio_ident(struct kvm_vcpu *vcpu,
1785                                   struct kvm_exit_mmio *mmio,
1786                                   phys_addr_t offset)
1787 {
1788         u32 reg;
1789
1790         if (mmio->is_write)
1791                 return false;
1792
1793         /* GICC_IIDR */
1794         reg = (PRODUCT_ID_KVM << 20) |
1795               (GICC_ARCH_VERSION_V2 << 16) |
1796               (IMPLEMENTER_ARM << 0);
1797         mmio_data_write(mmio, ~0, reg);
1798         return false;
1799 }
1800
1801 /*
1802  * CPU Interface Register accesses - these are not accessed by the VM, but by
1803  * user space for saving and restoring VGIC state.
1804  */
1805 static const struct mmio_range vgic_cpu_ranges[] = {
1806         {
1807                 .base           = GIC_CPU_CTRL,
1808                 .len            = 12,
1809                 .handle_mmio    = handle_cpu_mmio_misc,
1810         },
1811         {
1812                 .base           = GIC_CPU_ALIAS_BINPOINT,
1813                 .len            = 4,
1814                 .handle_mmio    = handle_mmio_abpr,
1815         },
1816         {
1817                 .base           = GIC_CPU_ACTIVEPRIO,
1818                 .len            = 16,
1819                 .handle_mmio    = handle_mmio_raz_wi,
1820         },
1821         {
1822                 .base           = GIC_CPU_IDENT,
1823                 .len            = 4,
1824                 .handle_mmio    = handle_cpu_mmio_ident,
1825         },
1826 };
1827
1828 static int vgic_attr_regs_access(struct kvm_device *dev,
1829                                  struct kvm_device_attr *attr,
1830                                  u32 *reg, bool is_write)
1831 {
1832         const struct mmio_range *r = NULL, *ranges;
1833         phys_addr_t offset;
1834         int ret, cpuid, c;
1835         struct kvm_vcpu *vcpu, *tmp_vcpu;
1836         struct vgic_dist *vgic;
1837         struct kvm_exit_mmio mmio;
1838
1839         offset = attr->attr & KVM_DEV_ARM_VGIC_OFFSET_MASK;
1840         cpuid = (attr->attr & KVM_DEV_ARM_VGIC_CPUID_MASK) >>
1841                 KVM_DEV_ARM_VGIC_CPUID_SHIFT;
1842
1843         mutex_lock(&dev->kvm->lock);
1844
1845         if (cpuid >= atomic_read(&dev->kvm->online_vcpus)) {
1846                 ret = -EINVAL;
1847                 goto out;
1848         }
1849
1850         vcpu = kvm_get_vcpu(dev->kvm, cpuid);
1851         vgic = &dev->kvm->arch.vgic;
1852
1853         mmio.len = 4;
1854         mmio.is_write = is_write;
1855         if (is_write)
1856                 mmio_data_write(&mmio, ~0, *reg);
1857         switch (attr->group) {
1858         case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
1859                 mmio.phys_addr = vgic->vgic_dist_base + offset;
1860                 ranges = vgic_dist_ranges;
1861                 break;
1862         case KVM_DEV_ARM_VGIC_GRP_CPU_REGS:
1863                 mmio.phys_addr = vgic->vgic_cpu_base + offset;
1864                 ranges = vgic_cpu_ranges;
1865                 break;
1866         default:
1867                 BUG();
1868         }
1869         r = find_matching_range(ranges, &mmio, offset);
1870
1871         if (unlikely(!r || !r->handle_mmio)) {
1872                 ret = -ENXIO;
1873                 goto out;
1874         }
1875
1876
1877         spin_lock(&vgic->lock);
1878
1879         /*
1880          * Ensure that no other VCPU is running by checking the vcpu->cpu
1881          * field.  If no other VPCUs are running we can safely access the VGIC
1882          * state, because even if another VPU is run after this point, that
1883          * VCPU will not touch the vgic state, because it will block on
1884          * getting the vgic->lock in kvm_vgic_sync_hwstate().
1885          */
1886         kvm_for_each_vcpu(c, tmp_vcpu, dev->kvm) {
1887                 if (unlikely(tmp_vcpu->cpu != -1)) {
1888                         ret = -EBUSY;
1889                         goto out_vgic_unlock;
1890                 }
1891         }
1892
1893         /*
1894          * Move all pending IRQs from the LRs on all VCPUs so the pending
1895          * state can be properly represented in the register state accessible
1896          * through this API.
1897          */
1898         kvm_for_each_vcpu(c, tmp_vcpu, dev->kvm)
1899                 vgic_unqueue_irqs(tmp_vcpu);
1900
1901         offset -= r->base;
1902         r->handle_mmio(vcpu, &mmio, offset);
1903
1904         if (!is_write)
1905                 *reg = mmio_data_read(&mmio, ~0);
1906
1907         ret = 0;
1908 out_vgic_unlock:
1909         spin_unlock(&vgic->lock);
1910 out:
1911         mutex_unlock(&dev->kvm->lock);
1912         return ret;
1913 }
1914
1915 static int vgic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1916 {
1917         int r;
1918
1919         switch (attr->group) {
1920         case KVM_DEV_ARM_VGIC_GRP_ADDR: {
1921                 u64 __user *uaddr = (u64 __user *)(long)attr->addr;
1922                 u64 addr;
1923                 unsigned long type = (unsigned long)attr->attr;
1924
1925                 if (copy_from_user(&addr, uaddr, sizeof(addr)))
1926                         return -EFAULT;
1927
1928                 r = kvm_vgic_addr(dev->kvm, type, &addr, true);
1929                 return (r == -ENODEV) ? -ENXIO : r;
1930         }
1931
1932         case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
1933         case KVM_DEV_ARM_VGIC_GRP_CPU_REGS: {
1934                 u32 __user *uaddr = (u32 __user *)(long)attr->addr;
1935                 u32 reg;
1936
1937                 if (get_user(reg, uaddr))
1938                         return -EFAULT;
1939
1940                 return vgic_attr_regs_access(dev, attr, &reg, true);
1941         }
1942
1943         }
1944
1945         return -ENXIO;
1946 }
1947
1948 static int vgic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1949 {
1950         int r = -ENXIO;
1951
1952         switch (attr->group) {
1953         case KVM_DEV_ARM_VGIC_GRP_ADDR: {
1954                 u64 __user *uaddr = (u64 __user *)(long)attr->addr;
1955                 u64 addr;
1956                 unsigned long type = (unsigned long)attr->attr;
1957
1958                 r = kvm_vgic_addr(dev->kvm, type, &addr, false);
1959                 if (r)
1960                         return (r == -ENODEV) ? -ENXIO : r;
1961
1962                 if (copy_to_user(uaddr, &addr, sizeof(addr)))
1963                         return -EFAULT;
1964                 break;
1965         }
1966
1967         case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
1968         case KVM_DEV_ARM_VGIC_GRP_CPU_REGS: {
1969                 u32 __user *uaddr = (u32 __user *)(long)attr->addr;
1970                 u32 reg = 0;
1971
1972                 r = vgic_attr_regs_access(dev, attr, &reg, false);
1973                 if (r)
1974                         return r;
1975                 r = put_user(reg, uaddr);
1976                 break;
1977         }
1978
1979         }
1980
1981         return r;
1982 }
1983
1984 static int vgic_has_attr_regs(const struct mmio_range *ranges,
1985                               phys_addr_t offset)
1986 {
1987         struct kvm_exit_mmio dev_attr_mmio;
1988
1989         dev_attr_mmio.len = 4;
1990         if (find_matching_range(ranges, &dev_attr_mmio, offset))
1991                 return 0;
1992         else
1993                 return -ENXIO;
1994 }
1995
1996 static int vgic_has_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1997 {
1998         phys_addr_t offset;
1999
2000         switch (attr->group) {
2001         case KVM_DEV_ARM_VGIC_GRP_ADDR:
2002                 switch (attr->attr) {
2003                 case KVM_VGIC_V2_ADDR_TYPE_DIST:
2004                 case KVM_VGIC_V2_ADDR_TYPE_CPU:
2005                         return 0;
2006                 }
2007                 break;
2008         case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
2009                 offset = attr->attr & KVM_DEV_ARM_VGIC_OFFSET_MASK;
2010                 return vgic_has_attr_regs(vgic_dist_ranges, offset);
2011         case KVM_DEV_ARM_VGIC_GRP_CPU_REGS:
2012                 offset = attr->attr & KVM_DEV_ARM_VGIC_OFFSET_MASK;
2013                 return vgic_has_attr_regs(vgic_cpu_ranges, offset);
2014         }
2015         return -ENXIO;
2016 }
2017
2018 static void vgic_destroy(struct kvm_device *dev)
2019 {
2020         kfree(dev);
2021 }
2022
2023 static int vgic_create(struct kvm_device *dev, u32 type)
2024 {
2025         return kvm_vgic_create(dev->kvm);
2026 }
2027
2028 struct kvm_device_ops kvm_arm_vgic_v2_ops = {
2029         .name = "kvm-arm-vgic",
2030         .create = vgic_create,
2031         .destroy = vgic_destroy,
2032         .set_attr = vgic_set_attr,
2033         .get_attr = vgic_get_attr,
2034         .has_attr = vgic_has_attr,
2035 };