1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2012-2015 - ARM Ltd 4 * Author: Marc Zyngier <marc.zyngier@arm.com> 5 */ 6 7 #include <hyp/adjust_pc.h> 8 9 #include <linux/compiler.h> 10 #include <linux/irqchip/arm-gic-v3.h> 11 #include <linux/kvm_host.h> 12 13 #include <asm/kvm_emulate.h> 14 #include <asm/kvm_hyp.h> 15 #include <asm/kvm_mmu.h> 16 17 #define vtr_to_max_lr_idx(v) ((v) & 0xf) 18 #define vtr_to_nr_pre_bits(v) ((((u32)(v) >> 26) & 7) + 1) 19 #define vtr_to_nr_apr_regs(v) (1 << (vtr_to_nr_pre_bits(v) - 5)) 20 21 static u64 __gic_v3_get_lr(unsigned int lr) 22 { 23 switch (lr & 0xf) { 24 case 0: 25 return read_gicreg(ICH_LR0_EL2); 26 case 1: 27 return read_gicreg(ICH_LR1_EL2); 28 case 2: 29 return read_gicreg(ICH_LR2_EL2); 30 case 3: 31 return read_gicreg(ICH_LR3_EL2); 32 case 4: 33 return read_gicreg(ICH_LR4_EL2); 34 case 5: 35 return read_gicreg(ICH_LR5_EL2); 36 case 6: 37 return read_gicreg(ICH_LR6_EL2); 38 case 7: 39 return read_gicreg(ICH_LR7_EL2); 40 case 8: 41 return read_gicreg(ICH_LR8_EL2); 42 case 9: 43 return read_gicreg(ICH_LR9_EL2); 44 case 10: 45 return read_gicreg(ICH_LR10_EL2); 46 case 11: 47 return read_gicreg(ICH_LR11_EL2); 48 case 12: 49 return read_gicreg(ICH_LR12_EL2); 50 case 13: 51 return read_gicreg(ICH_LR13_EL2); 52 case 14: 53 return read_gicreg(ICH_LR14_EL2); 54 case 15: 55 return read_gicreg(ICH_LR15_EL2); 56 } 57 58 unreachable(); 59 } 60 61 static void __gic_v3_set_lr(u64 val, int lr) 62 { 63 switch (lr & 0xf) { 64 case 0: 65 write_gicreg(val, ICH_LR0_EL2); 66 break; 67 case 1: 68 write_gicreg(val, ICH_LR1_EL2); 69 break; 70 case 2: 71 write_gicreg(val, ICH_LR2_EL2); 72 break; 73 case 3: 74 write_gicreg(val, ICH_LR3_EL2); 75 break; 76 case 4: 77 write_gicreg(val, ICH_LR4_EL2); 78 break; 79 case 5: 80 write_gicreg(val, ICH_LR5_EL2); 81 break; 82 case 6: 83 write_gicreg(val, ICH_LR6_EL2); 84 break; 85 case 7: 86 write_gicreg(val, ICH_LR7_EL2); 87 break; 88 case 8: 89 write_gicreg(val, ICH_LR8_EL2); 90 break; 91 case 9: 92 write_gicreg(val, ICH_LR9_EL2); 93 break; 94 case 10: 95 write_gicreg(val, ICH_LR10_EL2); 96 break; 97 case 11: 98 write_gicreg(val, ICH_LR11_EL2); 99 break; 100 case 12: 101 write_gicreg(val, ICH_LR12_EL2); 102 break; 103 case 13: 104 write_gicreg(val, ICH_LR13_EL2); 105 break; 106 case 14: 107 write_gicreg(val, ICH_LR14_EL2); 108 break; 109 case 15: 110 write_gicreg(val, ICH_LR15_EL2); 111 break; 112 } 113 } 114 115 static void __vgic_v3_write_ap0rn(u32 val, int n) 116 { 117 switch (n) { 118 case 0: 119 write_gicreg(val, ICH_AP0R0_EL2); 120 break; 121 case 1: 122 write_gicreg(val, ICH_AP0R1_EL2); 123 break; 124 case 2: 125 write_gicreg(val, ICH_AP0R2_EL2); 126 break; 127 case 3: 128 write_gicreg(val, ICH_AP0R3_EL2); 129 break; 130 } 131 } 132 133 static void __vgic_v3_write_ap1rn(u32 val, int n) 134 { 135 switch (n) { 136 case 0: 137 write_gicreg(val, ICH_AP1R0_EL2); 138 break; 139 case 1: 140 write_gicreg(val, ICH_AP1R1_EL2); 141 break; 142 case 2: 143 write_gicreg(val, ICH_AP1R2_EL2); 144 break; 145 case 3: 146 write_gicreg(val, ICH_AP1R3_EL2); 147 break; 148 } 149 } 150 151 static u32 __vgic_v3_read_ap0rn(int n) 152 { 153 u32 val; 154 155 switch (n) { 156 case 0: 157 val = read_gicreg(ICH_AP0R0_EL2); 158 break; 159 case 1: 160 val = read_gicreg(ICH_AP0R1_EL2); 161 break; 162 case 2: 163 val = read_gicreg(ICH_AP0R2_EL2); 164 break; 165 case 3: 166 val = read_gicreg(ICH_AP0R3_EL2); 167 break; 168 default: 169 unreachable(); 170 } 171 172 return val; 173 } 174 175 static u32 __vgic_v3_read_ap1rn(int n) 176 { 177 u32 val; 178 179 switch (n) { 180 case 0: 181 val = read_gicreg(ICH_AP1R0_EL2); 182 break; 183 case 1: 184 val = read_gicreg(ICH_AP1R1_EL2); 185 break; 186 case 2: 187 val = read_gicreg(ICH_AP1R2_EL2); 188 break; 189 case 3: 190 val = read_gicreg(ICH_AP1R3_EL2); 191 break; 192 default: 193 unreachable(); 194 } 195 196 return val; 197 } 198 199 void __vgic_v3_save_state(struct vgic_v3_cpu_if *cpu_if) 200 { 201 u64 used_lrs = cpu_if->used_lrs; 202 203 /* 204 * Make sure stores to the GIC via the memory mapped interface 205 * are now visible to the system register interface when reading the 206 * LRs, and when reading back the VMCR on non-VHE systems. 207 */ 208 if (used_lrs || !has_vhe()) { 209 if (!cpu_if->vgic_sre) { 210 dsb(sy); 211 isb(); 212 } 213 } 214 215 if (used_lrs || cpu_if->its_vpe.its_vm) { 216 int i; 217 u32 elrsr; 218 219 elrsr = read_gicreg(ICH_ELRSR_EL2); 220 221 write_gicreg(cpu_if->vgic_hcr & ~ICH_HCR_EN, ICH_HCR_EL2); 222 223 for (i = 0; i < used_lrs; i++) { 224 if (elrsr & (1 << i)) 225 cpu_if->vgic_lr[i] &= ~ICH_LR_STATE; 226 else 227 cpu_if->vgic_lr[i] = __gic_v3_get_lr(i); 228 229 __gic_v3_set_lr(0, i); 230 } 231 } 232 } 233 234 void __vgic_v3_restore_state(struct vgic_v3_cpu_if *cpu_if) 235 { 236 u64 used_lrs = cpu_if->used_lrs; 237 int i; 238 239 if (used_lrs || cpu_if->its_vpe.its_vm) { 240 write_gicreg(cpu_if->vgic_hcr, ICH_HCR_EL2); 241 242 for (i = 0; i < used_lrs; i++) 243 __gic_v3_set_lr(cpu_if->vgic_lr[i], i); 244 } 245 246 /* 247 * Ensure that writes to the LRs, and on non-VHE systems ensure that 248 * the write to the VMCR in __vgic_v3_activate_traps(), will have 249 * reached the (re)distributors. This ensure the guest will read the 250 * correct values from the memory-mapped interface. 251 */ 252 if (used_lrs || !has_vhe()) { 253 if (!cpu_if->vgic_sre) { 254 isb(); 255 dsb(sy); 256 } 257 } 258 } 259 260 void __vgic_v3_activate_traps(struct vgic_v3_cpu_if *cpu_if) 261 { 262 /* 263 * VFIQEn is RES1 if ICC_SRE_EL1.SRE is 1. This causes a 264 * Group0 interrupt (as generated in GICv2 mode) to be 265 * delivered as a FIQ to the guest, with potentially fatal 266 * consequences. So we must make sure that ICC_SRE_EL1 has 267 * been actually programmed with the value we want before 268 * starting to mess with the rest of the GIC, and VMCR_EL2 in 269 * particular. This logic must be called before 270 * __vgic_v3_restore_state(). 271 */ 272 if (!cpu_if->vgic_sre) { 273 write_gicreg(0, ICC_SRE_EL1); 274 isb(); 275 write_gicreg(cpu_if->vgic_vmcr, ICH_VMCR_EL2); 276 277 278 if (has_vhe()) { 279 /* 280 * Ensure that the write to the VMCR will have reached 281 * the (re)distributors. This ensure the guest will 282 * read the correct values from the memory-mapped 283 * interface. 284 */ 285 isb(); 286 dsb(sy); 287 } 288 } 289 290 /* 291 * Prevent the guest from touching the GIC system registers if 292 * SRE isn't enabled for GICv3 emulation. 293 */ 294 write_gicreg(read_gicreg(ICC_SRE_EL2) & ~ICC_SRE_EL2_ENABLE, 295 ICC_SRE_EL2); 296 297 /* 298 * If we need to trap system registers, we must write 299 * ICH_HCR_EL2 anyway, even if no interrupts are being 300 * injected, 301 */ 302 if (static_branch_unlikely(&vgic_v3_cpuif_trap) || 303 cpu_if->its_vpe.its_vm) 304 write_gicreg(cpu_if->vgic_hcr, ICH_HCR_EL2); 305 } 306 307 void __vgic_v3_deactivate_traps(struct vgic_v3_cpu_if *cpu_if) 308 { 309 u64 val; 310 311 if (!cpu_if->vgic_sre) { 312 cpu_if->vgic_vmcr = read_gicreg(ICH_VMCR_EL2); 313 } 314 315 val = read_gicreg(ICC_SRE_EL2); 316 write_gicreg(val | ICC_SRE_EL2_ENABLE, ICC_SRE_EL2); 317 318 if (!cpu_if->vgic_sre) { 319 /* Make sure ENABLE is set at EL2 before setting SRE at EL1 */ 320 isb(); 321 write_gicreg(1, ICC_SRE_EL1); 322 } 323 324 /* 325 * If we were trapping system registers, we enabled the VGIC even if 326 * no interrupts were being injected, and we disable it again here. 327 */ 328 if (static_branch_unlikely(&vgic_v3_cpuif_trap) || 329 cpu_if->its_vpe.its_vm) 330 write_gicreg(0, ICH_HCR_EL2); 331 } 332 333 void __vgic_v3_save_aprs(struct vgic_v3_cpu_if *cpu_if) 334 { 335 u64 val; 336 u32 nr_pre_bits; 337 338 val = read_gicreg(ICH_VTR_EL2); 339 nr_pre_bits = vtr_to_nr_pre_bits(val); 340 341 switch (nr_pre_bits) { 342 case 7: 343 cpu_if->vgic_ap0r[3] = __vgic_v3_read_ap0rn(3); 344 cpu_if->vgic_ap0r[2] = __vgic_v3_read_ap0rn(2); 345 fallthrough; 346 case 6: 347 cpu_if->vgic_ap0r[1] = __vgic_v3_read_ap0rn(1); 348 fallthrough; 349 default: 350 cpu_if->vgic_ap0r[0] = __vgic_v3_read_ap0rn(0); 351 } 352 353 switch (nr_pre_bits) { 354 case 7: 355 cpu_if->vgic_ap1r[3] = __vgic_v3_read_ap1rn(3); 356 cpu_if->vgic_ap1r[2] = __vgic_v3_read_ap1rn(2); 357 fallthrough; 358 case 6: 359 cpu_if->vgic_ap1r[1] = __vgic_v3_read_ap1rn(1); 360 fallthrough; 361 default: 362 cpu_if->vgic_ap1r[0] = __vgic_v3_read_ap1rn(0); 363 } 364 } 365 366 void __vgic_v3_restore_aprs(struct vgic_v3_cpu_if *cpu_if) 367 { 368 u64 val; 369 u32 nr_pre_bits; 370 371 val = read_gicreg(ICH_VTR_EL2); 372 nr_pre_bits = vtr_to_nr_pre_bits(val); 373 374 switch (nr_pre_bits) { 375 case 7: 376 __vgic_v3_write_ap0rn(cpu_if->vgic_ap0r[3], 3); 377 __vgic_v3_write_ap0rn(cpu_if->vgic_ap0r[2], 2); 378 fallthrough; 379 case 6: 380 __vgic_v3_write_ap0rn(cpu_if->vgic_ap0r[1], 1); 381 fallthrough; 382 default: 383 __vgic_v3_write_ap0rn(cpu_if->vgic_ap0r[0], 0); 384 } 385 386 switch (nr_pre_bits) { 387 case 7: 388 __vgic_v3_write_ap1rn(cpu_if->vgic_ap1r[3], 3); 389 __vgic_v3_write_ap1rn(cpu_if->vgic_ap1r[2], 2); 390 fallthrough; 391 case 6: 392 __vgic_v3_write_ap1rn(cpu_if->vgic_ap1r[1], 1); 393 fallthrough; 394 default: 395 __vgic_v3_write_ap1rn(cpu_if->vgic_ap1r[0], 0); 396 } 397 } 398 399 void __vgic_v3_init_lrs(void) 400 { 401 int max_lr_idx = vtr_to_max_lr_idx(read_gicreg(ICH_VTR_EL2)); 402 int i; 403 404 for (i = 0; i <= max_lr_idx; i++) 405 __gic_v3_set_lr(0, i); 406 } 407 408 /* 409 * Return the GIC CPU configuration: 410 * - [31:0] ICH_VTR_EL2 411 * - [62:32] RES0 412 * - [63] MMIO (GICv2) capable 413 */ 414 u64 __vgic_v3_get_gic_config(void) 415 { 416 u64 val, sre = read_gicreg(ICC_SRE_EL1); 417 unsigned long flags = 0; 418 419 /* 420 * To check whether we have a MMIO-based (GICv2 compatible) 421 * CPU interface, we need to disable the system register 422 * view. To do that safely, we have to prevent any interrupt 423 * from firing (which would be deadly). 424 * 425 * Note that this only makes sense on VHE, as interrupts are 426 * already masked for nVHE as part of the exception entry to 427 * EL2. 428 */ 429 if (has_vhe()) 430 flags = local_daif_save(); 431 432 /* 433 * Table 11-2 "Permitted ICC_SRE_ELx.SRE settings" indicates 434 * that to be able to set ICC_SRE_EL1.SRE to 0, all the 435 * interrupt overrides must be set. You've got to love this. 436 */ 437 sysreg_clear_set(hcr_el2, 0, HCR_AMO | HCR_FMO | HCR_IMO); 438 isb(); 439 write_gicreg(0, ICC_SRE_EL1); 440 isb(); 441 442 val = read_gicreg(ICC_SRE_EL1); 443 444 write_gicreg(sre, ICC_SRE_EL1); 445 isb(); 446 sysreg_clear_set(hcr_el2, HCR_AMO | HCR_FMO | HCR_IMO, 0); 447 isb(); 448 449 if (has_vhe()) 450 local_daif_restore(flags); 451 452 val = (val & ICC_SRE_EL1_SRE) ? 0 : (1ULL << 63); 453 val |= read_gicreg(ICH_VTR_EL2); 454 455 return val; 456 } 457 458 u64 __vgic_v3_read_vmcr(void) 459 { 460 return read_gicreg(ICH_VMCR_EL2); 461 } 462 463 void __vgic_v3_write_vmcr(u32 vmcr) 464 { 465 write_gicreg(vmcr, ICH_VMCR_EL2); 466 } 467 468 static int __vgic_v3_bpr_min(void) 469 { 470 /* See Pseudocode for VPriorityGroup */ 471 return 8 - vtr_to_nr_pre_bits(read_gicreg(ICH_VTR_EL2)); 472 } 473 474 static int __vgic_v3_get_group(struct kvm_vcpu *vcpu) 475 { 476 u32 esr = kvm_vcpu_get_esr(vcpu); 477 u8 crm = (esr & ESR_ELx_SYS64_ISS_CRM_MASK) >> ESR_ELx_SYS64_ISS_CRM_SHIFT; 478 479 return crm != 8; 480 } 481 482 #define GICv3_IDLE_PRIORITY 0xff 483 484 static int __vgic_v3_highest_priority_lr(struct kvm_vcpu *vcpu, u32 vmcr, 485 u64 *lr_val) 486 { 487 unsigned int used_lrs = vcpu->arch.vgic_cpu.vgic_v3.used_lrs; 488 u8 priority = GICv3_IDLE_PRIORITY; 489 int i, lr = -1; 490 491 for (i = 0; i < used_lrs; i++) { 492 u64 val = __gic_v3_get_lr(i); 493 u8 lr_prio = (val & ICH_LR_PRIORITY_MASK) >> ICH_LR_PRIORITY_SHIFT; 494 495 /* Not pending in the state? */ 496 if ((val & ICH_LR_STATE) != ICH_LR_PENDING_BIT) 497 continue; 498 499 /* Group-0 interrupt, but Group-0 disabled? */ 500 if (!(val & ICH_LR_GROUP) && !(vmcr & ICH_VMCR_ENG0_MASK)) 501 continue; 502 503 /* Group-1 interrupt, but Group-1 disabled? */ 504 if ((val & ICH_LR_GROUP) && !(vmcr & ICH_VMCR_ENG1_MASK)) 505 continue; 506 507 /* Not the highest priority? */ 508 if (lr_prio >= priority) 509 continue; 510 511 /* This is a candidate */ 512 priority = lr_prio; 513 *lr_val = val; 514 lr = i; 515 } 516 517 if (lr == -1) 518 *lr_val = ICC_IAR1_EL1_SPURIOUS; 519 520 return lr; 521 } 522 523 static int __vgic_v3_find_active_lr(struct kvm_vcpu *vcpu, int intid, 524 u64 *lr_val) 525 { 526 unsigned int used_lrs = vcpu->arch.vgic_cpu.vgic_v3.used_lrs; 527 int i; 528 529 for (i = 0; i < used_lrs; i++) { 530 u64 val = __gic_v3_get_lr(i); 531 532 if ((val & ICH_LR_VIRTUAL_ID_MASK) == intid && 533 (val & ICH_LR_ACTIVE_BIT)) { 534 *lr_val = val; 535 return i; 536 } 537 } 538 539 *lr_val = ICC_IAR1_EL1_SPURIOUS; 540 return -1; 541 } 542 543 static int __vgic_v3_get_highest_active_priority(void) 544 { 545 u8 nr_apr_regs = vtr_to_nr_apr_regs(read_gicreg(ICH_VTR_EL2)); 546 u32 hap = 0; 547 int i; 548 549 for (i = 0; i < nr_apr_regs; i++) { 550 u32 val; 551 552 /* 553 * The ICH_AP0Rn_EL2 and ICH_AP1Rn_EL2 registers 554 * contain the active priority levels for this VCPU 555 * for the maximum number of supported priority 556 * levels, and we return the full priority level only 557 * if the BPR is programmed to its minimum, otherwise 558 * we return a combination of the priority level and 559 * subpriority, as determined by the setting of the 560 * BPR, but without the full subpriority. 561 */ 562 val = __vgic_v3_read_ap0rn(i); 563 val |= __vgic_v3_read_ap1rn(i); 564 if (!val) { 565 hap += 32; 566 continue; 567 } 568 569 return (hap + __ffs(val)) << __vgic_v3_bpr_min(); 570 } 571 572 return GICv3_IDLE_PRIORITY; 573 } 574 575 static unsigned int __vgic_v3_get_bpr0(u32 vmcr) 576 { 577 return (vmcr & ICH_VMCR_BPR0_MASK) >> ICH_VMCR_BPR0_SHIFT; 578 } 579 580 static unsigned int __vgic_v3_get_bpr1(u32 vmcr) 581 { 582 unsigned int bpr; 583 584 if (vmcr & ICH_VMCR_CBPR_MASK) { 585 bpr = __vgic_v3_get_bpr0(vmcr); 586 if (bpr < 7) 587 bpr++; 588 } else { 589 bpr = (vmcr & ICH_VMCR_BPR1_MASK) >> ICH_VMCR_BPR1_SHIFT; 590 } 591 592 return bpr; 593 } 594 595 /* 596 * Convert a priority to a preemption level, taking the relevant BPR 597 * into account by zeroing the sub-priority bits. 598 */ 599 static u8 __vgic_v3_pri_to_pre(u8 pri, u32 vmcr, int grp) 600 { 601 unsigned int bpr; 602 603 if (!grp) 604 bpr = __vgic_v3_get_bpr0(vmcr) + 1; 605 else 606 bpr = __vgic_v3_get_bpr1(vmcr); 607 608 return pri & (GENMASK(7, 0) << bpr); 609 } 610 611 /* 612 * The priority value is independent of any of the BPR values, so we 613 * normalize it using the minimal BPR value. This guarantees that no 614 * matter what the guest does with its BPR, we can always set/get the 615 * same value of a priority. 616 */ 617 static void __vgic_v3_set_active_priority(u8 pri, u32 vmcr, int grp) 618 { 619 u8 pre, ap; 620 u32 val; 621 int apr; 622 623 pre = __vgic_v3_pri_to_pre(pri, vmcr, grp); 624 ap = pre >> __vgic_v3_bpr_min(); 625 apr = ap / 32; 626 627 if (!grp) { 628 val = __vgic_v3_read_ap0rn(apr); 629 __vgic_v3_write_ap0rn(val | BIT(ap % 32), apr); 630 } else { 631 val = __vgic_v3_read_ap1rn(apr); 632 __vgic_v3_write_ap1rn(val | BIT(ap % 32), apr); 633 } 634 } 635 636 static int __vgic_v3_clear_highest_active_priority(void) 637 { 638 u8 nr_apr_regs = vtr_to_nr_apr_regs(read_gicreg(ICH_VTR_EL2)); 639 u32 hap = 0; 640 int i; 641 642 for (i = 0; i < nr_apr_regs; i++) { 643 u32 ap0, ap1; 644 int c0, c1; 645 646 ap0 = __vgic_v3_read_ap0rn(i); 647 ap1 = __vgic_v3_read_ap1rn(i); 648 if (!ap0 && !ap1) { 649 hap += 32; 650 continue; 651 } 652 653 c0 = ap0 ? __ffs(ap0) : 32; 654 c1 = ap1 ? __ffs(ap1) : 32; 655 656 /* Always clear the LSB, which is the highest priority */ 657 if (c0 < c1) { 658 ap0 &= ~BIT(c0); 659 __vgic_v3_write_ap0rn(ap0, i); 660 hap += c0; 661 } else { 662 ap1 &= ~BIT(c1); 663 __vgic_v3_write_ap1rn(ap1, i); 664 hap += c1; 665 } 666 667 /* Rescale to 8 bits of priority */ 668 return hap << __vgic_v3_bpr_min(); 669 } 670 671 return GICv3_IDLE_PRIORITY; 672 } 673 674 static void __vgic_v3_read_iar(struct kvm_vcpu *vcpu, u32 vmcr, int rt) 675 { 676 u64 lr_val; 677 u8 lr_prio, pmr; 678 int lr, grp; 679 680 grp = __vgic_v3_get_group(vcpu); 681 682 lr = __vgic_v3_highest_priority_lr(vcpu, vmcr, &lr_val); 683 if (lr < 0) 684 goto spurious; 685 686 if (grp != !!(lr_val & ICH_LR_GROUP)) 687 goto spurious; 688 689 pmr = (vmcr & ICH_VMCR_PMR_MASK) >> ICH_VMCR_PMR_SHIFT; 690 lr_prio = (lr_val & ICH_LR_PRIORITY_MASK) >> ICH_LR_PRIORITY_SHIFT; 691 if (pmr <= lr_prio) 692 goto spurious; 693 694 if (__vgic_v3_get_highest_active_priority() <= __vgic_v3_pri_to_pre(lr_prio, vmcr, grp)) 695 goto spurious; 696 697 lr_val &= ~ICH_LR_STATE; 698 /* No active state for LPIs */ 699 if ((lr_val & ICH_LR_VIRTUAL_ID_MASK) <= VGIC_MAX_SPI) 700 lr_val |= ICH_LR_ACTIVE_BIT; 701 __gic_v3_set_lr(lr_val, lr); 702 __vgic_v3_set_active_priority(lr_prio, vmcr, grp); 703 vcpu_set_reg(vcpu, rt, lr_val & ICH_LR_VIRTUAL_ID_MASK); 704 return; 705 706 spurious: 707 vcpu_set_reg(vcpu, rt, ICC_IAR1_EL1_SPURIOUS); 708 } 709 710 static void __vgic_v3_clear_active_lr(int lr, u64 lr_val) 711 { 712 lr_val &= ~ICH_LR_ACTIVE_BIT; 713 if (lr_val & ICH_LR_HW) { 714 u32 pid; 715 716 pid = (lr_val & ICH_LR_PHYS_ID_MASK) >> ICH_LR_PHYS_ID_SHIFT; 717 gic_write_dir(pid); 718 } 719 720 __gic_v3_set_lr(lr_val, lr); 721 } 722 723 static void __vgic_v3_bump_eoicount(void) 724 { 725 u32 hcr; 726 727 hcr = read_gicreg(ICH_HCR_EL2); 728 hcr += 1 << ICH_HCR_EOIcount_SHIFT; 729 write_gicreg(hcr, ICH_HCR_EL2); 730 } 731 732 static void __vgic_v3_write_dir(struct kvm_vcpu *vcpu, u32 vmcr, int rt) 733 { 734 u32 vid = vcpu_get_reg(vcpu, rt); 735 u64 lr_val; 736 int lr; 737 738 /* EOImode == 0, nothing to be done here */ 739 if (!(vmcr & ICH_VMCR_EOIM_MASK)) 740 return; 741 742 /* No deactivate to be performed on an LPI */ 743 if (vid >= VGIC_MIN_LPI) 744 return; 745 746 lr = __vgic_v3_find_active_lr(vcpu, vid, &lr_val); 747 if (lr == -1) { 748 __vgic_v3_bump_eoicount(); 749 return; 750 } 751 752 __vgic_v3_clear_active_lr(lr, lr_val); 753 } 754 755 static void __vgic_v3_write_eoir(struct kvm_vcpu *vcpu, u32 vmcr, int rt) 756 { 757 u32 vid = vcpu_get_reg(vcpu, rt); 758 u64 lr_val; 759 u8 lr_prio, act_prio; 760 int lr, grp; 761 762 grp = __vgic_v3_get_group(vcpu); 763 764 /* Drop priority in any case */ 765 act_prio = __vgic_v3_clear_highest_active_priority(); 766 767 /* If EOIing an LPI, no deactivate to be performed */ 768 if (vid >= VGIC_MIN_LPI) 769 return; 770 771 /* EOImode == 1, nothing to be done here */ 772 if (vmcr & ICH_VMCR_EOIM_MASK) 773 return; 774 775 lr = __vgic_v3_find_active_lr(vcpu, vid, &lr_val); 776 if (lr == -1) { 777 __vgic_v3_bump_eoicount(); 778 return; 779 } 780 781 lr_prio = (lr_val & ICH_LR_PRIORITY_MASK) >> ICH_LR_PRIORITY_SHIFT; 782 783 /* If priorities or group do not match, the guest has fscked-up. */ 784 if (grp != !!(lr_val & ICH_LR_GROUP) || 785 __vgic_v3_pri_to_pre(lr_prio, vmcr, grp) != act_prio) 786 return; 787 788 /* Let's now perform the deactivation */ 789 __vgic_v3_clear_active_lr(lr, lr_val); 790 } 791 792 static void __vgic_v3_read_igrpen0(struct kvm_vcpu *vcpu, u32 vmcr, int rt) 793 { 794 vcpu_set_reg(vcpu, rt, !!(vmcr & ICH_VMCR_ENG0_MASK)); 795 } 796 797 static void __vgic_v3_read_igrpen1(struct kvm_vcpu *vcpu, u32 vmcr, int rt) 798 { 799 vcpu_set_reg(vcpu, rt, !!(vmcr & ICH_VMCR_ENG1_MASK)); 800 } 801 802 static void __vgic_v3_write_igrpen0(struct kvm_vcpu *vcpu, u32 vmcr, int rt) 803 { 804 u64 val = vcpu_get_reg(vcpu, rt); 805 806 if (val & 1) 807 vmcr |= ICH_VMCR_ENG0_MASK; 808 else 809 vmcr &= ~ICH_VMCR_ENG0_MASK; 810 811 __vgic_v3_write_vmcr(vmcr); 812 } 813 814 static void __vgic_v3_write_igrpen1(struct kvm_vcpu *vcpu, u32 vmcr, int rt) 815 { 816 u64 val = vcpu_get_reg(vcpu, rt); 817 818 if (val & 1) 819 vmcr |= ICH_VMCR_ENG1_MASK; 820 else 821 vmcr &= ~ICH_VMCR_ENG1_MASK; 822 823 __vgic_v3_write_vmcr(vmcr); 824 } 825 826 static void __vgic_v3_read_bpr0(struct kvm_vcpu *vcpu, u32 vmcr, int rt) 827 { 828 vcpu_set_reg(vcpu, rt, __vgic_v3_get_bpr0(vmcr)); 829 } 830 831 static void __vgic_v3_read_bpr1(struct kvm_vcpu *vcpu, u32 vmcr, int rt) 832 { 833 vcpu_set_reg(vcpu, rt, __vgic_v3_get_bpr1(vmcr)); 834 } 835 836 static void __vgic_v3_write_bpr0(struct kvm_vcpu *vcpu, u32 vmcr, int rt) 837 { 838 u64 val = vcpu_get_reg(vcpu, rt); 839 u8 bpr_min = __vgic_v3_bpr_min() - 1; 840 841 /* Enforce BPR limiting */ 842 if (val < bpr_min) 843 val = bpr_min; 844 845 val <<= ICH_VMCR_BPR0_SHIFT; 846 val &= ICH_VMCR_BPR0_MASK; 847 vmcr &= ~ICH_VMCR_BPR0_MASK; 848 vmcr |= val; 849 850 __vgic_v3_write_vmcr(vmcr); 851 } 852 853 static void __vgic_v3_write_bpr1(struct kvm_vcpu *vcpu, u32 vmcr, int rt) 854 { 855 u64 val = vcpu_get_reg(vcpu, rt); 856 u8 bpr_min = __vgic_v3_bpr_min(); 857 858 if (vmcr & ICH_VMCR_CBPR_MASK) 859 return; 860 861 /* Enforce BPR limiting */ 862 if (val < bpr_min) 863 val = bpr_min; 864 865 val <<= ICH_VMCR_BPR1_SHIFT; 866 val &= ICH_VMCR_BPR1_MASK; 867 vmcr &= ~ICH_VMCR_BPR1_MASK; 868 vmcr |= val; 869 870 __vgic_v3_write_vmcr(vmcr); 871 } 872 873 static void __vgic_v3_read_apxrn(struct kvm_vcpu *vcpu, int rt, int n) 874 { 875 u32 val; 876 877 if (!__vgic_v3_get_group(vcpu)) 878 val = __vgic_v3_read_ap0rn(n); 879 else 880 val = __vgic_v3_read_ap1rn(n); 881 882 vcpu_set_reg(vcpu, rt, val); 883 } 884 885 static void __vgic_v3_write_apxrn(struct kvm_vcpu *vcpu, int rt, int n) 886 { 887 u32 val = vcpu_get_reg(vcpu, rt); 888 889 if (!__vgic_v3_get_group(vcpu)) 890 __vgic_v3_write_ap0rn(val, n); 891 else 892 __vgic_v3_write_ap1rn(val, n); 893 } 894 895 static void __vgic_v3_read_apxr0(struct kvm_vcpu *vcpu, 896 u32 vmcr, int rt) 897 { 898 __vgic_v3_read_apxrn(vcpu, rt, 0); 899 } 900 901 static void __vgic_v3_read_apxr1(struct kvm_vcpu *vcpu, 902 u32 vmcr, int rt) 903 { 904 __vgic_v3_read_apxrn(vcpu, rt, 1); 905 } 906 907 static void __vgic_v3_read_apxr2(struct kvm_vcpu *vcpu, u32 vmcr, int rt) 908 { 909 __vgic_v3_read_apxrn(vcpu, rt, 2); 910 } 911 912 static void __vgic_v3_read_apxr3(struct kvm_vcpu *vcpu, u32 vmcr, int rt) 913 { 914 __vgic_v3_read_apxrn(vcpu, rt, 3); 915 } 916 917 static void __vgic_v3_write_apxr0(struct kvm_vcpu *vcpu, u32 vmcr, int rt) 918 { 919 __vgic_v3_write_apxrn(vcpu, rt, 0); 920 } 921 922 static void __vgic_v3_write_apxr1(struct kvm_vcpu *vcpu, u32 vmcr, int rt) 923 { 924 __vgic_v3_write_apxrn(vcpu, rt, 1); 925 } 926 927 static void __vgic_v3_write_apxr2(struct kvm_vcpu *vcpu, u32 vmcr, int rt) 928 { 929 __vgic_v3_write_apxrn(vcpu, rt, 2); 930 } 931 932 static void __vgic_v3_write_apxr3(struct kvm_vcpu *vcpu, u32 vmcr, int rt) 933 { 934 __vgic_v3_write_apxrn(vcpu, rt, 3); 935 } 936 937 static void __vgic_v3_read_hppir(struct kvm_vcpu *vcpu, u32 vmcr, int rt) 938 { 939 u64 lr_val; 940 int lr, lr_grp, grp; 941 942 grp = __vgic_v3_get_group(vcpu); 943 944 lr = __vgic_v3_highest_priority_lr(vcpu, vmcr, &lr_val); 945 if (lr == -1) 946 goto spurious; 947 948 lr_grp = !!(lr_val & ICH_LR_GROUP); 949 if (lr_grp != grp) 950 lr_val = ICC_IAR1_EL1_SPURIOUS; 951 952 spurious: 953 vcpu_set_reg(vcpu, rt, lr_val & ICH_LR_VIRTUAL_ID_MASK); 954 } 955 956 static void __vgic_v3_read_pmr(struct kvm_vcpu *vcpu, u32 vmcr, int rt) 957 { 958 vmcr &= ICH_VMCR_PMR_MASK; 959 vmcr >>= ICH_VMCR_PMR_SHIFT; 960 vcpu_set_reg(vcpu, rt, vmcr); 961 } 962 963 static void __vgic_v3_write_pmr(struct kvm_vcpu *vcpu, u32 vmcr, int rt) 964 { 965 u32 val = vcpu_get_reg(vcpu, rt); 966 967 val <<= ICH_VMCR_PMR_SHIFT; 968 val &= ICH_VMCR_PMR_MASK; 969 vmcr &= ~ICH_VMCR_PMR_MASK; 970 vmcr |= val; 971 972 write_gicreg(vmcr, ICH_VMCR_EL2); 973 } 974 975 static void __vgic_v3_read_rpr(struct kvm_vcpu *vcpu, u32 vmcr, int rt) 976 { 977 u32 val = __vgic_v3_get_highest_active_priority(); 978 vcpu_set_reg(vcpu, rt, val); 979 } 980 981 static void __vgic_v3_read_ctlr(struct kvm_vcpu *vcpu, u32 vmcr, int rt) 982 { 983 u32 vtr, val; 984 985 vtr = read_gicreg(ICH_VTR_EL2); 986 /* PRIbits */ 987 val = ((vtr >> 29) & 7) << ICC_CTLR_EL1_PRI_BITS_SHIFT; 988 /* IDbits */ 989 val |= ((vtr >> 23) & 7) << ICC_CTLR_EL1_ID_BITS_SHIFT; 990 /* SEIS */ 991 val |= ((vtr >> 22) & 1) << ICC_CTLR_EL1_SEIS_SHIFT; 992 /* A3V */ 993 val |= ((vtr >> 21) & 1) << ICC_CTLR_EL1_A3V_SHIFT; 994 /* EOImode */ 995 val |= ((vmcr & ICH_VMCR_EOIM_MASK) >> ICH_VMCR_EOIM_SHIFT) << ICC_CTLR_EL1_EOImode_SHIFT; 996 /* CBPR */ 997 val |= (vmcr & ICH_VMCR_CBPR_MASK) >> ICH_VMCR_CBPR_SHIFT; 998 999 vcpu_set_reg(vcpu, rt, val); 1000 } 1001 1002 static void __vgic_v3_write_ctlr(struct kvm_vcpu *vcpu, u32 vmcr, int rt) 1003 { 1004 u32 val = vcpu_get_reg(vcpu, rt); 1005 1006 if (val & ICC_CTLR_EL1_CBPR_MASK) 1007 vmcr |= ICH_VMCR_CBPR_MASK; 1008 else 1009 vmcr &= ~ICH_VMCR_CBPR_MASK; 1010 1011 if (val & ICC_CTLR_EL1_EOImode_MASK) 1012 vmcr |= ICH_VMCR_EOIM_MASK; 1013 else 1014 vmcr &= ~ICH_VMCR_EOIM_MASK; 1015 1016 write_gicreg(vmcr, ICH_VMCR_EL2); 1017 } 1018 1019 int __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu) 1020 { 1021 int rt; 1022 u32 esr; 1023 u32 vmcr; 1024 void (*fn)(struct kvm_vcpu *, u32, int); 1025 bool is_read; 1026 u32 sysreg; 1027 1028 esr = kvm_vcpu_get_esr(vcpu); 1029 if (vcpu_mode_is_32bit(vcpu)) { 1030 if (!kvm_condition_valid(vcpu)) { 1031 __kvm_skip_instr(vcpu); 1032 return 1; 1033 } 1034 1035 sysreg = esr_cp15_to_sysreg(esr); 1036 } else { 1037 sysreg = esr_sys64_to_sysreg(esr); 1038 } 1039 1040 is_read = (esr & ESR_ELx_SYS64_ISS_DIR_MASK) == ESR_ELx_SYS64_ISS_DIR_READ; 1041 1042 switch (sysreg) { 1043 case SYS_ICC_IAR0_EL1: 1044 case SYS_ICC_IAR1_EL1: 1045 if (unlikely(!is_read)) 1046 return 0; 1047 fn = __vgic_v3_read_iar; 1048 break; 1049 case SYS_ICC_EOIR0_EL1: 1050 case SYS_ICC_EOIR1_EL1: 1051 if (unlikely(is_read)) 1052 return 0; 1053 fn = __vgic_v3_write_eoir; 1054 break; 1055 case SYS_ICC_IGRPEN1_EL1: 1056 if (is_read) 1057 fn = __vgic_v3_read_igrpen1; 1058 else 1059 fn = __vgic_v3_write_igrpen1; 1060 break; 1061 case SYS_ICC_BPR1_EL1: 1062 if (is_read) 1063 fn = __vgic_v3_read_bpr1; 1064 else 1065 fn = __vgic_v3_write_bpr1; 1066 break; 1067 case SYS_ICC_AP0Rn_EL1(0): 1068 case SYS_ICC_AP1Rn_EL1(0): 1069 if (is_read) 1070 fn = __vgic_v3_read_apxr0; 1071 else 1072 fn = __vgic_v3_write_apxr0; 1073 break; 1074 case SYS_ICC_AP0Rn_EL1(1): 1075 case SYS_ICC_AP1Rn_EL1(1): 1076 if (is_read) 1077 fn = __vgic_v3_read_apxr1; 1078 else 1079 fn = __vgic_v3_write_apxr1; 1080 break; 1081 case SYS_ICC_AP0Rn_EL1(2): 1082 case SYS_ICC_AP1Rn_EL1(2): 1083 if (is_read) 1084 fn = __vgic_v3_read_apxr2; 1085 else 1086 fn = __vgic_v3_write_apxr2; 1087 break; 1088 case SYS_ICC_AP0Rn_EL1(3): 1089 case SYS_ICC_AP1Rn_EL1(3): 1090 if (is_read) 1091 fn = __vgic_v3_read_apxr3; 1092 else 1093 fn = __vgic_v3_write_apxr3; 1094 break; 1095 case SYS_ICC_HPPIR0_EL1: 1096 case SYS_ICC_HPPIR1_EL1: 1097 if (unlikely(!is_read)) 1098 return 0; 1099 fn = __vgic_v3_read_hppir; 1100 break; 1101 case SYS_ICC_IGRPEN0_EL1: 1102 if (is_read) 1103 fn = __vgic_v3_read_igrpen0; 1104 else 1105 fn = __vgic_v3_write_igrpen0; 1106 break; 1107 case SYS_ICC_BPR0_EL1: 1108 if (is_read) 1109 fn = __vgic_v3_read_bpr0; 1110 else 1111 fn = __vgic_v3_write_bpr0; 1112 break; 1113 case SYS_ICC_DIR_EL1: 1114 if (unlikely(is_read)) 1115 return 0; 1116 fn = __vgic_v3_write_dir; 1117 break; 1118 case SYS_ICC_RPR_EL1: 1119 if (unlikely(!is_read)) 1120 return 0; 1121 fn = __vgic_v3_read_rpr; 1122 break; 1123 case SYS_ICC_CTLR_EL1: 1124 if (is_read) 1125 fn = __vgic_v3_read_ctlr; 1126 else 1127 fn = __vgic_v3_write_ctlr; 1128 break; 1129 case SYS_ICC_PMR_EL1: 1130 if (is_read) 1131 fn = __vgic_v3_read_pmr; 1132 else 1133 fn = __vgic_v3_write_pmr; 1134 break; 1135 default: 1136 return 0; 1137 } 1138 1139 vmcr = __vgic_v3_read_vmcr(); 1140 rt = kvm_vcpu_sys_get_rt(vcpu); 1141 fn(vcpu, vmcr, rt); 1142 1143 __kvm_skip_instr(vcpu); 1144 1145 return 1; 1146 } 1147