1 /* 2 * Copyright (C) 2012,2013 - ARM Ltd 3 * Author: Marc Zyngier <marc.zyngier@arm.com> 4 * 5 * Derived from arch/arm/kvm/coproc.c: 6 * Copyright (C) 2012 - Virtual Open Systems and Columbia University 7 * Authors: Rusty Russell <rusty@rustcorp.com.au> 8 * Christoffer Dall <c.dall@virtualopensystems.com> 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License, version 2, as 12 * published by the Free Software Foundation. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program. If not, see <http://www.gnu.org/licenses/>. 21 */ 22 23 #include <linux/kvm_host.h> 24 #include <linux/mm.h> 25 #include <linux/uaccess.h> 26 27 #include <asm/cacheflush.h> 28 #include <asm/cputype.h> 29 #include <asm/debug-monitors.h> 30 #include <asm/esr.h> 31 #include <asm/kvm_arm.h> 32 #include <asm/kvm_asm.h> 33 #include <asm/kvm_coproc.h> 34 #include <asm/kvm_emulate.h> 35 #include <asm/kvm_host.h> 36 #include <asm/kvm_mmu.h> 37 38 #include <trace/events/kvm.h> 39 40 #include "sys_regs.h" 41 42 #include "trace.h" 43 44 /* 45 * All of this file is extremly similar to the ARM coproc.c, but the 46 * types are different. My gut feeling is that it should be pretty 47 * easy to merge, but that would be an ABI breakage -- again. VFP 48 * would also need to be abstracted. 49 * 50 * For AArch32, we only take care of what is being trapped. Anything 51 * that has to do with init and userspace access has to go via the 52 * 64bit interface. 53 */ 54 55 /* 3 bits per cache level, as per CLIDR, but non-existent caches always 0 */ 56 static u32 cache_levels; 57 58 /* CSSELR values; used to index KVM_REG_ARM_DEMUX_ID_CCSIDR */ 59 #define CSSELR_MAX 12 60 61 /* Which cache CCSIDR represents depends on CSSELR value. */ 62 static u32 get_ccsidr(u32 csselr) 63 { 64 u32 ccsidr; 65 66 /* Make sure noone else changes CSSELR during this! */ 67 local_irq_disable(); 68 /* Put value into CSSELR */ 69 asm volatile("msr csselr_el1, %x0" : : "r" (csselr)); 70 isb(); 71 /* Read result out of CCSIDR */ 72 asm volatile("mrs %0, ccsidr_el1" : "=r" (ccsidr)); 73 local_irq_enable(); 74 75 return ccsidr; 76 } 77 78 /* 79 * See note at ARMv7 ARM B1.14.4 (TL;DR: S/W ops are not easily virtualized). 80 */ 81 static bool access_dcsw(struct kvm_vcpu *vcpu, 82 struct sys_reg_params *p, 83 const struct sys_reg_desc *r) 84 { 85 if (!p->is_write) 86 return read_from_write_only(vcpu, p); 87 88 kvm_set_way_flush(vcpu); 89 return true; 90 } 91 92 /* 93 * Generic accessor for VM registers. Only called as long as HCR_TVM 94 * is set. If the guest enables the MMU, we stop trapping the VM 95 * sys_regs and leave it in complete control of the caches. 96 */ 97 static bool access_vm_reg(struct kvm_vcpu *vcpu, 98 struct sys_reg_params *p, 99 const struct sys_reg_desc *r) 100 { 101 bool was_enabled = vcpu_has_cache_enabled(vcpu); 102 103 BUG_ON(!p->is_write); 104 105 if (!p->is_aarch32) { 106 vcpu_sys_reg(vcpu, r->reg) = p->regval; 107 } else { 108 if (!p->is_32bit) 109 vcpu_cp15_64_high(vcpu, r->reg) = upper_32_bits(p->regval); 110 vcpu_cp15_64_low(vcpu, r->reg) = lower_32_bits(p->regval); 111 } 112 113 kvm_toggle_cache(vcpu, was_enabled); 114 return true; 115 } 116 117 /* 118 * Trap handler for the GICv3 SGI generation system register. 119 * Forward the request to the VGIC emulation. 120 * The cp15_64 code makes sure this automatically works 121 * for both AArch64 and AArch32 accesses. 122 */ 123 static bool access_gic_sgi(struct kvm_vcpu *vcpu, 124 struct sys_reg_params *p, 125 const struct sys_reg_desc *r) 126 { 127 if (!p->is_write) 128 return read_from_write_only(vcpu, p); 129 130 vgic_v3_dispatch_sgi(vcpu, p->regval); 131 132 return true; 133 } 134 135 static bool trap_raz_wi(struct kvm_vcpu *vcpu, 136 struct sys_reg_params *p, 137 const struct sys_reg_desc *r) 138 { 139 if (p->is_write) 140 return ignore_write(vcpu, p); 141 else 142 return read_zero(vcpu, p); 143 } 144 145 static bool trap_oslsr_el1(struct kvm_vcpu *vcpu, 146 struct sys_reg_params *p, 147 const struct sys_reg_desc *r) 148 { 149 if (p->is_write) { 150 return ignore_write(vcpu, p); 151 } else { 152 p->regval = (1 << 3); 153 return true; 154 } 155 } 156 157 static bool trap_dbgauthstatus_el1(struct kvm_vcpu *vcpu, 158 struct sys_reg_params *p, 159 const struct sys_reg_desc *r) 160 { 161 if (p->is_write) { 162 return ignore_write(vcpu, p); 163 } else { 164 u32 val; 165 asm volatile("mrs %0, dbgauthstatus_el1" : "=r" (val)); 166 p->regval = val; 167 return true; 168 } 169 } 170 171 /* 172 * We want to avoid world-switching all the DBG registers all the 173 * time: 174 * 175 * - If we've touched any debug register, it is likely that we're 176 * going to touch more of them. It then makes sense to disable the 177 * traps and start doing the save/restore dance 178 * - If debug is active (DBG_MDSCR_KDE or DBG_MDSCR_MDE set), it is 179 * then mandatory to save/restore the registers, as the guest 180 * depends on them. 181 * 182 * For this, we use a DIRTY bit, indicating the guest has modified the 183 * debug registers, used as follow: 184 * 185 * On guest entry: 186 * - If the dirty bit is set (because we're coming back from trapping), 187 * disable the traps, save host registers, restore guest registers. 188 * - If debug is actively in use (DBG_MDSCR_KDE or DBG_MDSCR_MDE set), 189 * set the dirty bit, disable the traps, save host registers, 190 * restore guest registers. 191 * - Otherwise, enable the traps 192 * 193 * On guest exit: 194 * - If the dirty bit is set, save guest registers, restore host 195 * registers and clear the dirty bit. This ensure that the host can 196 * now use the debug registers. 197 */ 198 static bool trap_debug_regs(struct kvm_vcpu *vcpu, 199 struct sys_reg_params *p, 200 const struct sys_reg_desc *r) 201 { 202 if (p->is_write) { 203 vcpu_sys_reg(vcpu, r->reg) = p->regval; 204 vcpu->arch.debug_flags |= KVM_ARM64_DEBUG_DIRTY; 205 } else { 206 p->regval = vcpu_sys_reg(vcpu, r->reg); 207 } 208 209 trace_trap_reg(__func__, r->reg, p->is_write, p->regval); 210 211 return true; 212 } 213 214 /* 215 * reg_to_dbg/dbg_to_reg 216 * 217 * A 32 bit write to a debug register leave top bits alone 218 * A 32 bit read from a debug register only returns the bottom bits 219 * 220 * All writes will set the KVM_ARM64_DEBUG_DIRTY flag to ensure the 221 * hyp.S code switches between host and guest values in future. 222 */ 223 static void reg_to_dbg(struct kvm_vcpu *vcpu, 224 struct sys_reg_params *p, 225 u64 *dbg_reg) 226 { 227 u64 val = p->regval; 228 229 if (p->is_32bit) { 230 val &= 0xffffffffUL; 231 val |= ((*dbg_reg >> 32) << 32); 232 } 233 234 *dbg_reg = val; 235 vcpu->arch.debug_flags |= KVM_ARM64_DEBUG_DIRTY; 236 } 237 238 static void dbg_to_reg(struct kvm_vcpu *vcpu, 239 struct sys_reg_params *p, 240 u64 *dbg_reg) 241 { 242 p->regval = *dbg_reg; 243 if (p->is_32bit) 244 p->regval &= 0xffffffffUL; 245 } 246 247 static bool trap_bvr(struct kvm_vcpu *vcpu, 248 struct sys_reg_params *p, 249 const struct sys_reg_desc *rd) 250 { 251 u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_bvr[rd->reg]; 252 253 if (p->is_write) 254 reg_to_dbg(vcpu, p, dbg_reg); 255 else 256 dbg_to_reg(vcpu, p, dbg_reg); 257 258 trace_trap_reg(__func__, rd->reg, p->is_write, *dbg_reg); 259 260 return true; 261 } 262 263 static int set_bvr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 264 const struct kvm_one_reg *reg, void __user *uaddr) 265 { 266 __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_bvr[rd->reg]; 267 268 if (copy_from_user(r, uaddr, KVM_REG_SIZE(reg->id)) != 0) 269 return -EFAULT; 270 return 0; 271 } 272 273 static int get_bvr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 274 const struct kvm_one_reg *reg, void __user *uaddr) 275 { 276 __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_bvr[rd->reg]; 277 278 if (copy_to_user(uaddr, r, KVM_REG_SIZE(reg->id)) != 0) 279 return -EFAULT; 280 return 0; 281 } 282 283 static void reset_bvr(struct kvm_vcpu *vcpu, 284 const struct sys_reg_desc *rd) 285 { 286 vcpu->arch.vcpu_debug_state.dbg_bvr[rd->reg] = rd->val; 287 } 288 289 static bool trap_bcr(struct kvm_vcpu *vcpu, 290 struct sys_reg_params *p, 291 const struct sys_reg_desc *rd) 292 { 293 u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_bcr[rd->reg]; 294 295 if (p->is_write) 296 reg_to_dbg(vcpu, p, dbg_reg); 297 else 298 dbg_to_reg(vcpu, p, dbg_reg); 299 300 trace_trap_reg(__func__, rd->reg, p->is_write, *dbg_reg); 301 302 return true; 303 } 304 305 static int set_bcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 306 const struct kvm_one_reg *reg, void __user *uaddr) 307 { 308 __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_bcr[rd->reg]; 309 310 if (copy_from_user(r, uaddr, KVM_REG_SIZE(reg->id)) != 0) 311 return -EFAULT; 312 313 return 0; 314 } 315 316 static int get_bcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 317 const struct kvm_one_reg *reg, void __user *uaddr) 318 { 319 __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_bcr[rd->reg]; 320 321 if (copy_to_user(uaddr, r, KVM_REG_SIZE(reg->id)) != 0) 322 return -EFAULT; 323 return 0; 324 } 325 326 static void reset_bcr(struct kvm_vcpu *vcpu, 327 const struct sys_reg_desc *rd) 328 { 329 vcpu->arch.vcpu_debug_state.dbg_bcr[rd->reg] = rd->val; 330 } 331 332 static bool trap_wvr(struct kvm_vcpu *vcpu, 333 struct sys_reg_params *p, 334 const struct sys_reg_desc *rd) 335 { 336 u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_wvr[rd->reg]; 337 338 if (p->is_write) 339 reg_to_dbg(vcpu, p, dbg_reg); 340 else 341 dbg_to_reg(vcpu, p, dbg_reg); 342 343 trace_trap_reg(__func__, rd->reg, p->is_write, 344 vcpu->arch.vcpu_debug_state.dbg_wvr[rd->reg]); 345 346 return true; 347 } 348 349 static int set_wvr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 350 const struct kvm_one_reg *reg, void __user *uaddr) 351 { 352 __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_wvr[rd->reg]; 353 354 if (copy_from_user(r, uaddr, KVM_REG_SIZE(reg->id)) != 0) 355 return -EFAULT; 356 return 0; 357 } 358 359 static int get_wvr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 360 const struct kvm_one_reg *reg, void __user *uaddr) 361 { 362 __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_wvr[rd->reg]; 363 364 if (copy_to_user(uaddr, r, KVM_REG_SIZE(reg->id)) != 0) 365 return -EFAULT; 366 return 0; 367 } 368 369 static void reset_wvr(struct kvm_vcpu *vcpu, 370 const struct sys_reg_desc *rd) 371 { 372 vcpu->arch.vcpu_debug_state.dbg_wvr[rd->reg] = rd->val; 373 } 374 375 static bool trap_wcr(struct kvm_vcpu *vcpu, 376 struct sys_reg_params *p, 377 const struct sys_reg_desc *rd) 378 { 379 u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_wcr[rd->reg]; 380 381 if (p->is_write) 382 reg_to_dbg(vcpu, p, dbg_reg); 383 else 384 dbg_to_reg(vcpu, p, dbg_reg); 385 386 trace_trap_reg(__func__, rd->reg, p->is_write, *dbg_reg); 387 388 return true; 389 } 390 391 static int set_wcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 392 const struct kvm_one_reg *reg, void __user *uaddr) 393 { 394 __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_wcr[rd->reg]; 395 396 if (copy_from_user(r, uaddr, KVM_REG_SIZE(reg->id)) != 0) 397 return -EFAULT; 398 return 0; 399 } 400 401 static int get_wcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 402 const struct kvm_one_reg *reg, void __user *uaddr) 403 { 404 __u64 *r = &vcpu->arch.vcpu_debug_state.dbg_wcr[rd->reg]; 405 406 if (copy_to_user(uaddr, r, KVM_REG_SIZE(reg->id)) != 0) 407 return -EFAULT; 408 return 0; 409 } 410 411 static void reset_wcr(struct kvm_vcpu *vcpu, 412 const struct sys_reg_desc *rd) 413 { 414 vcpu->arch.vcpu_debug_state.dbg_wcr[rd->reg] = rd->val; 415 } 416 417 static void reset_amair_el1(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) 418 { 419 u64 amair; 420 421 asm volatile("mrs %0, amair_el1\n" : "=r" (amair)); 422 vcpu_sys_reg(vcpu, AMAIR_EL1) = amair; 423 } 424 425 static void reset_mpidr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) 426 { 427 u64 mpidr; 428 429 /* 430 * Map the vcpu_id into the first three affinity level fields of 431 * the MPIDR. We limit the number of VCPUs in level 0 due to a 432 * limitation to 16 CPUs in that level in the ICC_SGIxR registers 433 * of the GICv3 to be able to address each CPU directly when 434 * sending IPIs. 435 */ 436 mpidr = (vcpu->vcpu_id & 0x0f) << MPIDR_LEVEL_SHIFT(0); 437 mpidr |= ((vcpu->vcpu_id >> 4) & 0xff) << MPIDR_LEVEL_SHIFT(1); 438 mpidr |= ((vcpu->vcpu_id >> 12) & 0xff) << MPIDR_LEVEL_SHIFT(2); 439 vcpu_sys_reg(vcpu, MPIDR_EL1) = (1ULL << 31) | mpidr; 440 } 441 442 /* Silly macro to expand the DBG{BCR,BVR,WVR,WCR}n_EL1 registers in one go */ 443 #define DBG_BCR_BVR_WCR_WVR_EL1(n) \ 444 /* DBGBVRn_EL1 */ \ 445 { Op0(0b10), Op1(0b000), CRn(0b0000), CRm((n)), Op2(0b100), \ 446 trap_bvr, reset_bvr, n, 0, get_bvr, set_bvr }, \ 447 /* DBGBCRn_EL1 */ \ 448 { Op0(0b10), Op1(0b000), CRn(0b0000), CRm((n)), Op2(0b101), \ 449 trap_bcr, reset_bcr, n, 0, get_bcr, set_bcr }, \ 450 /* DBGWVRn_EL1 */ \ 451 { Op0(0b10), Op1(0b000), CRn(0b0000), CRm((n)), Op2(0b110), \ 452 trap_wvr, reset_wvr, n, 0, get_wvr, set_wvr }, \ 453 /* DBGWCRn_EL1 */ \ 454 { Op0(0b10), Op1(0b000), CRn(0b0000), CRm((n)), Op2(0b111), \ 455 trap_wcr, reset_wcr, n, 0, get_wcr, set_wcr } 456 457 /* 458 * Architected system registers. 459 * Important: Must be sorted ascending by Op0, Op1, CRn, CRm, Op2 460 * 461 * We could trap ID_DFR0 and tell the guest we don't support performance 462 * monitoring. Unfortunately the patch to make the kernel check ID_DFR0 was 463 * NAKed, so it will read the PMCR anyway. 464 * 465 * Therefore we tell the guest we have 0 counters. Unfortunately, we 466 * must always support PMCCNTR (the cycle counter): we just RAZ/WI for 467 * all PM registers, which doesn't crash the guest kernel at least. 468 * 469 * Debug handling: We do trap most, if not all debug related system 470 * registers. The implementation is good enough to ensure that a guest 471 * can use these with minimal performance degradation. The drawback is 472 * that we don't implement any of the external debug, none of the 473 * OSlock protocol. This should be revisited if we ever encounter a 474 * more demanding guest... 475 */ 476 static const struct sys_reg_desc sys_reg_descs[] = { 477 /* DC ISW */ 478 { Op0(0b01), Op1(0b000), CRn(0b0111), CRm(0b0110), Op2(0b010), 479 access_dcsw }, 480 /* DC CSW */ 481 { Op0(0b01), Op1(0b000), CRn(0b0111), CRm(0b1010), Op2(0b010), 482 access_dcsw }, 483 /* DC CISW */ 484 { Op0(0b01), Op1(0b000), CRn(0b0111), CRm(0b1110), Op2(0b010), 485 access_dcsw }, 486 487 DBG_BCR_BVR_WCR_WVR_EL1(0), 488 DBG_BCR_BVR_WCR_WVR_EL1(1), 489 /* MDCCINT_EL1 */ 490 { Op0(0b10), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b000), 491 trap_debug_regs, reset_val, MDCCINT_EL1, 0 }, 492 /* MDSCR_EL1 */ 493 { Op0(0b10), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b010), 494 trap_debug_regs, reset_val, MDSCR_EL1, 0 }, 495 DBG_BCR_BVR_WCR_WVR_EL1(2), 496 DBG_BCR_BVR_WCR_WVR_EL1(3), 497 DBG_BCR_BVR_WCR_WVR_EL1(4), 498 DBG_BCR_BVR_WCR_WVR_EL1(5), 499 DBG_BCR_BVR_WCR_WVR_EL1(6), 500 DBG_BCR_BVR_WCR_WVR_EL1(7), 501 DBG_BCR_BVR_WCR_WVR_EL1(8), 502 DBG_BCR_BVR_WCR_WVR_EL1(9), 503 DBG_BCR_BVR_WCR_WVR_EL1(10), 504 DBG_BCR_BVR_WCR_WVR_EL1(11), 505 DBG_BCR_BVR_WCR_WVR_EL1(12), 506 DBG_BCR_BVR_WCR_WVR_EL1(13), 507 DBG_BCR_BVR_WCR_WVR_EL1(14), 508 DBG_BCR_BVR_WCR_WVR_EL1(15), 509 510 /* MDRAR_EL1 */ 511 { Op0(0b10), Op1(0b000), CRn(0b0001), CRm(0b0000), Op2(0b000), 512 trap_raz_wi }, 513 /* OSLAR_EL1 */ 514 { Op0(0b10), Op1(0b000), CRn(0b0001), CRm(0b0000), Op2(0b100), 515 trap_raz_wi }, 516 /* OSLSR_EL1 */ 517 { Op0(0b10), Op1(0b000), CRn(0b0001), CRm(0b0001), Op2(0b100), 518 trap_oslsr_el1 }, 519 /* OSDLR_EL1 */ 520 { Op0(0b10), Op1(0b000), CRn(0b0001), CRm(0b0011), Op2(0b100), 521 trap_raz_wi }, 522 /* DBGPRCR_EL1 */ 523 { Op0(0b10), Op1(0b000), CRn(0b0001), CRm(0b0100), Op2(0b100), 524 trap_raz_wi }, 525 /* DBGCLAIMSET_EL1 */ 526 { Op0(0b10), Op1(0b000), CRn(0b0111), CRm(0b1000), Op2(0b110), 527 trap_raz_wi }, 528 /* DBGCLAIMCLR_EL1 */ 529 { Op0(0b10), Op1(0b000), CRn(0b0111), CRm(0b1001), Op2(0b110), 530 trap_raz_wi }, 531 /* DBGAUTHSTATUS_EL1 */ 532 { Op0(0b10), Op1(0b000), CRn(0b0111), CRm(0b1110), Op2(0b110), 533 trap_dbgauthstatus_el1 }, 534 535 /* MDCCSR_EL1 */ 536 { Op0(0b10), Op1(0b011), CRn(0b0000), CRm(0b0001), Op2(0b000), 537 trap_raz_wi }, 538 /* DBGDTR_EL0 */ 539 { Op0(0b10), Op1(0b011), CRn(0b0000), CRm(0b0100), Op2(0b000), 540 trap_raz_wi }, 541 /* DBGDTR[TR]X_EL0 */ 542 { Op0(0b10), Op1(0b011), CRn(0b0000), CRm(0b0101), Op2(0b000), 543 trap_raz_wi }, 544 545 /* DBGVCR32_EL2 */ 546 { Op0(0b10), Op1(0b100), CRn(0b0000), CRm(0b0111), Op2(0b000), 547 NULL, reset_val, DBGVCR32_EL2, 0 }, 548 549 /* MPIDR_EL1 */ 550 { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0000), Op2(0b101), 551 NULL, reset_mpidr, MPIDR_EL1 }, 552 /* SCTLR_EL1 */ 553 { Op0(0b11), Op1(0b000), CRn(0b0001), CRm(0b0000), Op2(0b000), 554 access_vm_reg, reset_val, SCTLR_EL1, 0x00C50078 }, 555 /* CPACR_EL1 */ 556 { Op0(0b11), Op1(0b000), CRn(0b0001), CRm(0b0000), Op2(0b010), 557 NULL, reset_val, CPACR_EL1, 0 }, 558 /* TTBR0_EL1 */ 559 { Op0(0b11), Op1(0b000), CRn(0b0010), CRm(0b0000), Op2(0b000), 560 access_vm_reg, reset_unknown, TTBR0_EL1 }, 561 /* TTBR1_EL1 */ 562 { Op0(0b11), Op1(0b000), CRn(0b0010), CRm(0b0000), Op2(0b001), 563 access_vm_reg, reset_unknown, TTBR1_EL1 }, 564 /* TCR_EL1 */ 565 { Op0(0b11), Op1(0b000), CRn(0b0010), CRm(0b0000), Op2(0b010), 566 access_vm_reg, reset_val, TCR_EL1, 0 }, 567 568 /* AFSR0_EL1 */ 569 { Op0(0b11), Op1(0b000), CRn(0b0101), CRm(0b0001), Op2(0b000), 570 access_vm_reg, reset_unknown, AFSR0_EL1 }, 571 /* AFSR1_EL1 */ 572 { Op0(0b11), Op1(0b000), CRn(0b0101), CRm(0b0001), Op2(0b001), 573 access_vm_reg, reset_unknown, AFSR1_EL1 }, 574 /* ESR_EL1 */ 575 { Op0(0b11), Op1(0b000), CRn(0b0101), CRm(0b0010), Op2(0b000), 576 access_vm_reg, reset_unknown, ESR_EL1 }, 577 /* FAR_EL1 */ 578 { Op0(0b11), Op1(0b000), CRn(0b0110), CRm(0b0000), Op2(0b000), 579 access_vm_reg, reset_unknown, FAR_EL1 }, 580 /* PAR_EL1 */ 581 { Op0(0b11), Op1(0b000), CRn(0b0111), CRm(0b0100), Op2(0b000), 582 NULL, reset_unknown, PAR_EL1 }, 583 584 /* PMINTENSET_EL1 */ 585 { Op0(0b11), Op1(0b000), CRn(0b1001), CRm(0b1110), Op2(0b001), 586 trap_raz_wi }, 587 /* PMINTENCLR_EL1 */ 588 { Op0(0b11), Op1(0b000), CRn(0b1001), CRm(0b1110), Op2(0b010), 589 trap_raz_wi }, 590 591 /* MAIR_EL1 */ 592 { Op0(0b11), Op1(0b000), CRn(0b1010), CRm(0b0010), Op2(0b000), 593 access_vm_reg, reset_unknown, MAIR_EL1 }, 594 /* AMAIR_EL1 */ 595 { Op0(0b11), Op1(0b000), CRn(0b1010), CRm(0b0011), Op2(0b000), 596 access_vm_reg, reset_amair_el1, AMAIR_EL1 }, 597 598 /* VBAR_EL1 */ 599 { Op0(0b11), Op1(0b000), CRn(0b1100), CRm(0b0000), Op2(0b000), 600 NULL, reset_val, VBAR_EL1, 0 }, 601 602 /* ICC_SGI1R_EL1 */ 603 { Op0(0b11), Op1(0b000), CRn(0b1100), CRm(0b1011), Op2(0b101), 604 access_gic_sgi }, 605 /* ICC_SRE_EL1 */ 606 { Op0(0b11), Op1(0b000), CRn(0b1100), CRm(0b1100), Op2(0b101), 607 trap_raz_wi }, 608 609 /* CONTEXTIDR_EL1 */ 610 { Op0(0b11), Op1(0b000), CRn(0b1101), CRm(0b0000), Op2(0b001), 611 access_vm_reg, reset_val, CONTEXTIDR_EL1, 0 }, 612 /* TPIDR_EL1 */ 613 { Op0(0b11), Op1(0b000), CRn(0b1101), CRm(0b0000), Op2(0b100), 614 NULL, reset_unknown, TPIDR_EL1 }, 615 616 /* CNTKCTL_EL1 */ 617 { Op0(0b11), Op1(0b000), CRn(0b1110), CRm(0b0001), Op2(0b000), 618 NULL, reset_val, CNTKCTL_EL1, 0}, 619 620 /* CSSELR_EL1 */ 621 { Op0(0b11), Op1(0b010), CRn(0b0000), CRm(0b0000), Op2(0b000), 622 NULL, reset_unknown, CSSELR_EL1 }, 623 624 /* PMCR_EL0 */ 625 { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b000), 626 trap_raz_wi }, 627 /* PMCNTENSET_EL0 */ 628 { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b001), 629 trap_raz_wi }, 630 /* PMCNTENCLR_EL0 */ 631 { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b010), 632 trap_raz_wi }, 633 /* PMOVSCLR_EL0 */ 634 { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b011), 635 trap_raz_wi }, 636 /* PMSWINC_EL0 */ 637 { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b100), 638 trap_raz_wi }, 639 /* PMSELR_EL0 */ 640 { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b101), 641 trap_raz_wi }, 642 /* PMCEID0_EL0 */ 643 { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b110), 644 trap_raz_wi }, 645 /* PMCEID1_EL0 */ 646 { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b111), 647 trap_raz_wi }, 648 /* PMCCNTR_EL0 */ 649 { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1101), Op2(0b000), 650 trap_raz_wi }, 651 /* PMXEVTYPER_EL0 */ 652 { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1101), Op2(0b001), 653 trap_raz_wi }, 654 /* PMXEVCNTR_EL0 */ 655 { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1101), Op2(0b010), 656 trap_raz_wi }, 657 /* PMUSERENR_EL0 */ 658 { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1110), Op2(0b000), 659 trap_raz_wi }, 660 /* PMOVSSET_EL0 */ 661 { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1110), Op2(0b011), 662 trap_raz_wi }, 663 664 /* TPIDR_EL0 */ 665 { Op0(0b11), Op1(0b011), CRn(0b1101), CRm(0b0000), Op2(0b010), 666 NULL, reset_unknown, TPIDR_EL0 }, 667 /* TPIDRRO_EL0 */ 668 { Op0(0b11), Op1(0b011), CRn(0b1101), CRm(0b0000), Op2(0b011), 669 NULL, reset_unknown, TPIDRRO_EL0 }, 670 671 /* DACR32_EL2 */ 672 { Op0(0b11), Op1(0b100), CRn(0b0011), CRm(0b0000), Op2(0b000), 673 NULL, reset_unknown, DACR32_EL2 }, 674 /* IFSR32_EL2 */ 675 { Op0(0b11), Op1(0b100), CRn(0b0101), CRm(0b0000), Op2(0b001), 676 NULL, reset_unknown, IFSR32_EL2 }, 677 /* FPEXC32_EL2 */ 678 { Op0(0b11), Op1(0b100), CRn(0b0101), CRm(0b0011), Op2(0b000), 679 NULL, reset_val, FPEXC32_EL2, 0x70 }, 680 }; 681 682 static bool trap_dbgidr(struct kvm_vcpu *vcpu, 683 struct sys_reg_params *p, 684 const struct sys_reg_desc *r) 685 { 686 if (p->is_write) { 687 return ignore_write(vcpu, p); 688 } else { 689 u64 dfr = read_system_reg(SYS_ID_AA64DFR0_EL1); 690 u64 pfr = read_system_reg(SYS_ID_AA64PFR0_EL1); 691 u32 el3 = !!cpuid_feature_extract_field(pfr, ID_AA64PFR0_EL3_SHIFT); 692 693 p->regval = ((((dfr >> ID_AA64DFR0_WRPS_SHIFT) & 0xf) << 28) | 694 (((dfr >> ID_AA64DFR0_BRPS_SHIFT) & 0xf) << 24) | 695 (((dfr >> ID_AA64DFR0_CTX_CMPS_SHIFT) & 0xf) << 20) 696 | (6 << 16) | (el3 << 14) | (el3 << 12)); 697 return true; 698 } 699 } 700 701 static bool trap_debug32(struct kvm_vcpu *vcpu, 702 struct sys_reg_params *p, 703 const struct sys_reg_desc *r) 704 { 705 if (p->is_write) { 706 vcpu_cp14(vcpu, r->reg) = p->regval; 707 vcpu->arch.debug_flags |= KVM_ARM64_DEBUG_DIRTY; 708 } else { 709 p->regval = vcpu_cp14(vcpu, r->reg); 710 } 711 712 return true; 713 } 714 715 /* AArch32 debug register mappings 716 * 717 * AArch32 DBGBVRn is mapped to DBGBVRn_EL1[31:0] 718 * AArch32 DBGBXVRn is mapped to DBGBVRn_EL1[63:32] 719 * 720 * All control registers and watchpoint value registers are mapped to 721 * the lower 32 bits of their AArch64 equivalents. We share the trap 722 * handlers with the above AArch64 code which checks what mode the 723 * system is in. 724 */ 725 726 static bool trap_xvr(struct kvm_vcpu *vcpu, 727 struct sys_reg_params *p, 728 const struct sys_reg_desc *rd) 729 { 730 u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_bvr[rd->reg]; 731 732 if (p->is_write) { 733 u64 val = *dbg_reg; 734 735 val &= 0xffffffffUL; 736 val |= p->regval << 32; 737 *dbg_reg = val; 738 739 vcpu->arch.debug_flags |= KVM_ARM64_DEBUG_DIRTY; 740 } else { 741 p->regval = *dbg_reg >> 32; 742 } 743 744 trace_trap_reg(__func__, rd->reg, p->is_write, *dbg_reg); 745 746 return true; 747 } 748 749 #define DBG_BCR_BVR_WCR_WVR(n) \ 750 /* DBGBVRn */ \ 751 { Op1( 0), CRn( 0), CRm((n)), Op2( 4), trap_bvr, NULL, n }, \ 752 /* DBGBCRn */ \ 753 { Op1( 0), CRn( 0), CRm((n)), Op2( 5), trap_bcr, NULL, n }, \ 754 /* DBGWVRn */ \ 755 { Op1( 0), CRn( 0), CRm((n)), Op2( 6), trap_wvr, NULL, n }, \ 756 /* DBGWCRn */ \ 757 { Op1( 0), CRn( 0), CRm((n)), Op2( 7), trap_wcr, NULL, n } 758 759 #define DBGBXVR(n) \ 760 { Op1( 0), CRn( 1), CRm((n)), Op2( 1), trap_xvr, NULL, n } 761 762 /* 763 * Trapped cp14 registers. We generally ignore most of the external 764 * debug, on the principle that they don't really make sense to a 765 * guest. Revisit this one day, would this principle change. 766 */ 767 static const struct sys_reg_desc cp14_regs[] = { 768 /* DBGIDR */ 769 { Op1( 0), CRn( 0), CRm( 0), Op2( 0), trap_dbgidr }, 770 /* DBGDTRRXext */ 771 { Op1( 0), CRn( 0), CRm( 0), Op2( 2), trap_raz_wi }, 772 773 DBG_BCR_BVR_WCR_WVR(0), 774 /* DBGDSCRint */ 775 { Op1( 0), CRn( 0), CRm( 1), Op2( 0), trap_raz_wi }, 776 DBG_BCR_BVR_WCR_WVR(1), 777 /* DBGDCCINT */ 778 { Op1( 0), CRn( 0), CRm( 2), Op2( 0), trap_debug32 }, 779 /* DBGDSCRext */ 780 { Op1( 0), CRn( 0), CRm( 2), Op2( 2), trap_debug32 }, 781 DBG_BCR_BVR_WCR_WVR(2), 782 /* DBGDTR[RT]Xint */ 783 { Op1( 0), CRn( 0), CRm( 3), Op2( 0), trap_raz_wi }, 784 /* DBGDTR[RT]Xext */ 785 { Op1( 0), CRn( 0), CRm( 3), Op2( 2), trap_raz_wi }, 786 DBG_BCR_BVR_WCR_WVR(3), 787 DBG_BCR_BVR_WCR_WVR(4), 788 DBG_BCR_BVR_WCR_WVR(5), 789 /* DBGWFAR */ 790 { Op1( 0), CRn( 0), CRm( 6), Op2( 0), trap_raz_wi }, 791 /* DBGOSECCR */ 792 { Op1( 0), CRn( 0), CRm( 6), Op2( 2), trap_raz_wi }, 793 DBG_BCR_BVR_WCR_WVR(6), 794 /* DBGVCR */ 795 { Op1( 0), CRn( 0), CRm( 7), Op2( 0), trap_debug32 }, 796 DBG_BCR_BVR_WCR_WVR(7), 797 DBG_BCR_BVR_WCR_WVR(8), 798 DBG_BCR_BVR_WCR_WVR(9), 799 DBG_BCR_BVR_WCR_WVR(10), 800 DBG_BCR_BVR_WCR_WVR(11), 801 DBG_BCR_BVR_WCR_WVR(12), 802 DBG_BCR_BVR_WCR_WVR(13), 803 DBG_BCR_BVR_WCR_WVR(14), 804 DBG_BCR_BVR_WCR_WVR(15), 805 806 /* DBGDRAR (32bit) */ 807 { Op1( 0), CRn( 1), CRm( 0), Op2( 0), trap_raz_wi }, 808 809 DBGBXVR(0), 810 /* DBGOSLAR */ 811 { Op1( 0), CRn( 1), CRm( 0), Op2( 4), trap_raz_wi }, 812 DBGBXVR(1), 813 /* DBGOSLSR */ 814 { Op1( 0), CRn( 1), CRm( 1), Op2( 4), trap_oslsr_el1 }, 815 DBGBXVR(2), 816 DBGBXVR(3), 817 /* DBGOSDLR */ 818 { Op1( 0), CRn( 1), CRm( 3), Op2( 4), trap_raz_wi }, 819 DBGBXVR(4), 820 /* DBGPRCR */ 821 { Op1( 0), CRn( 1), CRm( 4), Op2( 4), trap_raz_wi }, 822 DBGBXVR(5), 823 DBGBXVR(6), 824 DBGBXVR(7), 825 DBGBXVR(8), 826 DBGBXVR(9), 827 DBGBXVR(10), 828 DBGBXVR(11), 829 DBGBXVR(12), 830 DBGBXVR(13), 831 DBGBXVR(14), 832 DBGBXVR(15), 833 834 /* DBGDSAR (32bit) */ 835 { Op1( 0), CRn( 2), CRm( 0), Op2( 0), trap_raz_wi }, 836 837 /* DBGDEVID2 */ 838 { Op1( 0), CRn( 7), CRm( 0), Op2( 7), trap_raz_wi }, 839 /* DBGDEVID1 */ 840 { Op1( 0), CRn( 7), CRm( 1), Op2( 7), trap_raz_wi }, 841 /* DBGDEVID */ 842 { Op1( 0), CRn( 7), CRm( 2), Op2( 7), trap_raz_wi }, 843 /* DBGCLAIMSET */ 844 { Op1( 0), CRn( 7), CRm( 8), Op2( 6), trap_raz_wi }, 845 /* DBGCLAIMCLR */ 846 { Op1( 0), CRn( 7), CRm( 9), Op2( 6), trap_raz_wi }, 847 /* DBGAUTHSTATUS */ 848 { Op1( 0), CRn( 7), CRm(14), Op2( 6), trap_dbgauthstatus_el1 }, 849 }; 850 851 /* Trapped cp14 64bit registers */ 852 static const struct sys_reg_desc cp14_64_regs[] = { 853 /* DBGDRAR (64bit) */ 854 { Op1( 0), CRm( 1), .access = trap_raz_wi }, 855 856 /* DBGDSAR (64bit) */ 857 { Op1( 0), CRm( 2), .access = trap_raz_wi }, 858 }; 859 860 /* 861 * Trapped cp15 registers. TTBR0/TTBR1 get a double encoding, 862 * depending on the way they are accessed (as a 32bit or a 64bit 863 * register). 864 */ 865 static const struct sys_reg_desc cp15_regs[] = { 866 { Op1( 0), CRn( 0), CRm(12), Op2( 0), access_gic_sgi }, 867 868 { Op1( 0), CRn( 1), CRm( 0), Op2( 0), access_vm_reg, NULL, c1_SCTLR }, 869 { Op1( 0), CRn( 2), CRm( 0), Op2( 0), access_vm_reg, NULL, c2_TTBR0 }, 870 { Op1( 0), CRn( 2), CRm( 0), Op2( 1), access_vm_reg, NULL, c2_TTBR1 }, 871 { Op1( 0), CRn( 2), CRm( 0), Op2( 2), access_vm_reg, NULL, c2_TTBCR }, 872 { Op1( 0), CRn( 3), CRm( 0), Op2( 0), access_vm_reg, NULL, c3_DACR }, 873 { Op1( 0), CRn( 5), CRm( 0), Op2( 0), access_vm_reg, NULL, c5_DFSR }, 874 { Op1( 0), CRn( 5), CRm( 0), Op2( 1), access_vm_reg, NULL, c5_IFSR }, 875 { Op1( 0), CRn( 5), CRm( 1), Op2( 0), access_vm_reg, NULL, c5_ADFSR }, 876 { Op1( 0), CRn( 5), CRm( 1), Op2( 1), access_vm_reg, NULL, c5_AIFSR }, 877 { Op1( 0), CRn( 6), CRm( 0), Op2( 0), access_vm_reg, NULL, c6_DFAR }, 878 { Op1( 0), CRn( 6), CRm( 0), Op2( 2), access_vm_reg, NULL, c6_IFAR }, 879 880 /* 881 * DC{C,I,CI}SW operations: 882 */ 883 { Op1( 0), CRn( 7), CRm( 6), Op2( 2), access_dcsw }, 884 { Op1( 0), CRn( 7), CRm(10), Op2( 2), access_dcsw }, 885 { Op1( 0), CRn( 7), CRm(14), Op2( 2), access_dcsw }, 886 887 /* PMU */ 888 { Op1( 0), CRn( 9), CRm(12), Op2( 0), trap_raz_wi }, 889 { Op1( 0), CRn( 9), CRm(12), Op2( 1), trap_raz_wi }, 890 { Op1( 0), CRn( 9), CRm(12), Op2( 2), trap_raz_wi }, 891 { Op1( 0), CRn( 9), CRm(12), Op2( 3), trap_raz_wi }, 892 { Op1( 0), CRn( 9), CRm(12), Op2( 5), trap_raz_wi }, 893 { Op1( 0), CRn( 9), CRm(12), Op2( 6), trap_raz_wi }, 894 { Op1( 0), CRn( 9), CRm(12), Op2( 7), trap_raz_wi }, 895 { Op1( 0), CRn( 9), CRm(13), Op2( 0), trap_raz_wi }, 896 { Op1( 0), CRn( 9), CRm(13), Op2( 1), trap_raz_wi }, 897 { Op1( 0), CRn( 9), CRm(13), Op2( 2), trap_raz_wi }, 898 { Op1( 0), CRn( 9), CRm(14), Op2( 0), trap_raz_wi }, 899 { Op1( 0), CRn( 9), CRm(14), Op2( 1), trap_raz_wi }, 900 { Op1( 0), CRn( 9), CRm(14), Op2( 2), trap_raz_wi }, 901 902 { Op1( 0), CRn(10), CRm( 2), Op2( 0), access_vm_reg, NULL, c10_PRRR }, 903 { Op1( 0), CRn(10), CRm( 2), Op2( 1), access_vm_reg, NULL, c10_NMRR }, 904 { Op1( 0), CRn(10), CRm( 3), Op2( 0), access_vm_reg, NULL, c10_AMAIR0 }, 905 { Op1( 0), CRn(10), CRm( 3), Op2( 1), access_vm_reg, NULL, c10_AMAIR1 }, 906 907 /* ICC_SRE */ 908 { Op1( 0), CRn(12), CRm(12), Op2( 5), trap_raz_wi }, 909 910 { Op1( 0), CRn(13), CRm( 0), Op2( 1), access_vm_reg, NULL, c13_CID }, 911 }; 912 913 static const struct sys_reg_desc cp15_64_regs[] = { 914 { Op1( 0), CRn( 0), CRm( 2), Op2( 0), access_vm_reg, NULL, c2_TTBR0 }, 915 { Op1( 0), CRn( 0), CRm(12), Op2( 0), access_gic_sgi }, 916 { Op1( 1), CRn( 0), CRm( 2), Op2( 0), access_vm_reg, NULL, c2_TTBR1 }, 917 }; 918 919 /* Target specific emulation tables */ 920 static struct kvm_sys_reg_target_table *target_tables[KVM_ARM_NUM_TARGETS]; 921 922 void kvm_register_target_sys_reg_table(unsigned int target, 923 struct kvm_sys_reg_target_table *table) 924 { 925 target_tables[target] = table; 926 } 927 928 /* Get specific register table for this target. */ 929 static const struct sys_reg_desc *get_target_table(unsigned target, 930 bool mode_is_64, 931 size_t *num) 932 { 933 struct kvm_sys_reg_target_table *table; 934 935 table = target_tables[target]; 936 if (mode_is_64) { 937 *num = table->table64.num; 938 return table->table64.table; 939 } else { 940 *num = table->table32.num; 941 return table->table32.table; 942 } 943 } 944 945 static const struct sys_reg_desc *find_reg(const struct sys_reg_params *params, 946 const struct sys_reg_desc table[], 947 unsigned int num) 948 { 949 unsigned int i; 950 951 for (i = 0; i < num; i++) { 952 const struct sys_reg_desc *r = &table[i]; 953 954 if (params->Op0 != r->Op0) 955 continue; 956 if (params->Op1 != r->Op1) 957 continue; 958 if (params->CRn != r->CRn) 959 continue; 960 if (params->CRm != r->CRm) 961 continue; 962 if (params->Op2 != r->Op2) 963 continue; 964 965 return r; 966 } 967 return NULL; 968 } 969 970 int kvm_handle_cp14_load_store(struct kvm_vcpu *vcpu, struct kvm_run *run) 971 { 972 kvm_inject_undefined(vcpu); 973 return 1; 974 } 975 976 /* 977 * emulate_cp -- tries to match a sys_reg access in a handling table, and 978 * call the corresponding trap handler. 979 * 980 * @params: pointer to the descriptor of the access 981 * @table: array of trap descriptors 982 * @num: size of the trap descriptor array 983 * 984 * Return 0 if the access has been handled, and -1 if not. 985 */ 986 static int emulate_cp(struct kvm_vcpu *vcpu, 987 struct sys_reg_params *params, 988 const struct sys_reg_desc *table, 989 size_t num) 990 { 991 const struct sys_reg_desc *r; 992 993 if (!table) 994 return -1; /* Not handled */ 995 996 r = find_reg(params, table, num); 997 998 if (r) { 999 /* 1000 * Not having an accessor means that we have 1001 * configured a trap that we don't know how to 1002 * handle. This certainly qualifies as a gross bug 1003 * that should be fixed right away. 1004 */ 1005 BUG_ON(!r->access); 1006 1007 if (likely(r->access(vcpu, params, r))) { 1008 /* Skip instruction, since it was emulated */ 1009 kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu)); 1010 /* Handled */ 1011 return 0; 1012 } 1013 } 1014 1015 /* Not handled */ 1016 return -1; 1017 } 1018 1019 static void unhandled_cp_access(struct kvm_vcpu *vcpu, 1020 struct sys_reg_params *params) 1021 { 1022 u8 hsr_ec = kvm_vcpu_trap_get_class(vcpu); 1023 int cp; 1024 1025 switch(hsr_ec) { 1026 case ESR_ELx_EC_CP15_32: 1027 case ESR_ELx_EC_CP15_64: 1028 cp = 15; 1029 break; 1030 case ESR_ELx_EC_CP14_MR: 1031 case ESR_ELx_EC_CP14_64: 1032 cp = 14; 1033 break; 1034 default: 1035 WARN_ON((cp = -1)); 1036 } 1037 1038 kvm_err("Unsupported guest CP%d access at: %08lx\n", 1039 cp, *vcpu_pc(vcpu)); 1040 print_sys_reg_instr(params); 1041 kvm_inject_undefined(vcpu); 1042 } 1043 1044 /** 1045 * kvm_handle_cp_64 -- handles a mrrc/mcrr trap on a guest CP14/CP15 access 1046 * @vcpu: The VCPU pointer 1047 * @run: The kvm_run struct 1048 */ 1049 static int kvm_handle_cp_64(struct kvm_vcpu *vcpu, 1050 const struct sys_reg_desc *global, 1051 size_t nr_global, 1052 const struct sys_reg_desc *target_specific, 1053 size_t nr_specific) 1054 { 1055 struct sys_reg_params params; 1056 u32 hsr = kvm_vcpu_get_hsr(vcpu); 1057 int Rt = (hsr >> 5) & 0xf; 1058 int Rt2 = (hsr >> 10) & 0xf; 1059 1060 params.is_aarch32 = true; 1061 params.is_32bit = false; 1062 params.CRm = (hsr >> 1) & 0xf; 1063 params.is_write = ((hsr & 1) == 0); 1064 1065 params.Op0 = 0; 1066 params.Op1 = (hsr >> 16) & 0xf; 1067 params.Op2 = 0; 1068 params.CRn = 0; 1069 1070 /* 1071 * Make a 64-bit value out of Rt and Rt2. As we use the same trap 1072 * backends between AArch32 and AArch64, we get away with it. 1073 */ 1074 if (params.is_write) { 1075 params.regval = vcpu_get_reg(vcpu, Rt) & 0xffffffff; 1076 params.regval |= vcpu_get_reg(vcpu, Rt2) << 32; 1077 } 1078 1079 if (!emulate_cp(vcpu, ¶ms, target_specific, nr_specific)) 1080 goto out; 1081 if (!emulate_cp(vcpu, ¶ms, global, nr_global)) 1082 goto out; 1083 1084 unhandled_cp_access(vcpu, ¶ms); 1085 1086 out: 1087 /* Split up the value between registers for the read side */ 1088 if (!params.is_write) { 1089 vcpu_set_reg(vcpu, Rt, lower_32_bits(params.regval)); 1090 vcpu_set_reg(vcpu, Rt2, upper_32_bits(params.regval)); 1091 } 1092 1093 return 1; 1094 } 1095 1096 /** 1097 * kvm_handle_cp_32 -- handles a mrc/mcr trap on a guest CP14/CP15 access 1098 * @vcpu: The VCPU pointer 1099 * @run: The kvm_run struct 1100 */ 1101 static int kvm_handle_cp_32(struct kvm_vcpu *vcpu, 1102 const struct sys_reg_desc *global, 1103 size_t nr_global, 1104 const struct sys_reg_desc *target_specific, 1105 size_t nr_specific) 1106 { 1107 struct sys_reg_params params; 1108 u32 hsr = kvm_vcpu_get_hsr(vcpu); 1109 int Rt = (hsr >> 5) & 0xf; 1110 1111 params.is_aarch32 = true; 1112 params.is_32bit = true; 1113 params.CRm = (hsr >> 1) & 0xf; 1114 params.regval = vcpu_get_reg(vcpu, Rt); 1115 params.is_write = ((hsr & 1) == 0); 1116 params.CRn = (hsr >> 10) & 0xf; 1117 params.Op0 = 0; 1118 params.Op1 = (hsr >> 14) & 0x7; 1119 params.Op2 = (hsr >> 17) & 0x7; 1120 1121 if (!emulate_cp(vcpu, ¶ms, target_specific, nr_specific) || 1122 !emulate_cp(vcpu, ¶ms, global, nr_global)) { 1123 if (!params.is_write) 1124 vcpu_set_reg(vcpu, Rt, params.regval); 1125 return 1; 1126 } 1127 1128 unhandled_cp_access(vcpu, ¶ms); 1129 return 1; 1130 } 1131 1132 int kvm_handle_cp15_64(struct kvm_vcpu *vcpu, struct kvm_run *run) 1133 { 1134 const struct sys_reg_desc *target_specific; 1135 size_t num; 1136 1137 target_specific = get_target_table(vcpu->arch.target, false, &num); 1138 return kvm_handle_cp_64(vcpu, 1139 cp15_64_regs, ARRAY_SIZE(cp15_64_regs), 1140 target_specific, num); 1141 } 1142 1143 int kvm_handle_cp15_32(struct kvm_vcpu *vcpu, struct kvm_run *run) 1144 { 1145 const struct sys_reg_desc *target_specific; 1146 size_t num; 1147 1148 target_specific = get_target_table(vcpu->arch.target, false, &num); 1149 return kvm_handle_cp_32(vcpu, 1150 cp15_regs, ARRAY_SIZE(cp15_regs), 1151 target_specific, num); 1152 } 1153 1154 int kvm_handle_cp14_64(struct kvm_vcpu *vcpu, struct kvm_run *run) 1155 { 1156 return kvm_handle_cp_64(vcpu, 1157 cp14_64_regs, ARRAY_SIZE(cp14_64_regs), 1158 NULL, 0); 1159 } 1160 1161 int kvm_handle_cp14_32(struct kvm_vcpu *vcpu, struct kvm_run *run) 1162 { 1163 return kvm_handle_cp_32(vcpu, 1164 cp14_regs, ARRAY_SIZE(cp14_regs), 1165 NULL, 0); 1166 } 1167 1168 static int emulate_sys_reg(struct kvm_vcpu *vcpu, 1169 struct sys_reg_params *params) 1170 { 1171 size_t num; 1172 const struct sys_reg_desc *table, *r; 1173 1174 table = get_target_table(vcpu->arch.target, true, &num); 1175 1176 /* Search target-specific then generic table. */ 1177 r = find_reg(params, table, num); 1178 if (!r) 1179 r = find_reg(params, sys_reg_descs, ARRAY_SIZE(sys_reg_descs)); 1180 1181 if (likely(r)) { 1182 /* 1183 * Not having an accessor means that we have 1184 * configured a trap that we don't know how to 1185 * handle. This certainly qualifies as a gross bug 1186 * that should be fixed right away. 1187 */ 1188 BUG_ON(!r->access); 1189 1190 if (likely(r->access(vcpu, params, r))) { 1191 /* Skip instruction, since it was emulated */ 1192 kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu)); 1193 return 1; 1194 } 1195 /* If access function fails, it should complain. */ 1196 } else { 1197 kvm_err("Unsupported guest sys_reg access at: %lx\n", 1198 *vcpu_pc(vcpu)); 1199 print_sys_reg_instr(params); 1200 } 1201 kvm_inject_undefined(vcpu); 1202 return 1; 1203 } 1204 1205 static void reset_sys_reg_descs(struct kvm_vcpu *vcpu, 1206 const struct sys_reg_desc *table, size_t num) 1207 { 1208 unsigned long i; 1209 1210 for (i = 0; i < num; i++) 1211 if (table[i].reset) 1212 table[i].reset(vcpu, &table[i]); 1213 } 1214 1215 /** 1216 * kvm_handle_sys_reg -- handles a mrs/msr trap on a guest sys_reg access 1217 * @vcpu: The VCPU pointer 1218 * @run: The kvm_run struct 1219 */ 1220 int kvm_handle_sys_reg(struct kvm_vcpu *vcpu, struct kvm_run *run) 1221 { 1222 struct sys_reg_params params; 1223 unsigned long esr = kvm_vcpu_get_hsr(vcpu); 1224 int Rt = (esr >> 5) & 0x1f; 1225 int ret; 1226 1227 trace_kvm_handle_sys_reg(esr); 1228 1229 params.is_aarch32 = false; 1230 params.is_32bit = false; 1231 params.Op0 = (esr >> 20) & 3; 1232 params.Op1 = (esr >> 14) & 0x7; 1233 params.CRn = (esr >> 10) & 0xf; 1234 params.CRm = (esr >> 1) & 0xf; 1235 params.Op2 = (esr >> 17) & 0x7; 1236 params.regval = vcpu_get_reg(vcpu, Rt); 1237 params.is_write = !(esr & 1); 1238 1239 ret = emulate_sys_reg(vcpu, ¶ms); 1240 1241 if (!params.is_write) 1242 vcpu_set_reg(vcpu, Rt, params.regval); 1243 return ret; 1244 } 1245 1246 /****************************************************************************** 1247 * Userspace API 1248 *****************************************************************************/ 1249 1250 static bool index_to_params(u64 id, struct sys_reg_params *params) 1251 { 1252 switch (id & KVM_REG_SIZE_MASK) { 1253 case KVM_REG_SIZE_U64: 1254 /* Any unused index bits means it's not valid. */ 1255 if (id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK 1256 | KVM_REG_ARM_COPROC_MASK 1257 | KVM_REG_ARM64_SYSREG_OP0_MASK 1258 | KVM_REG_ARM64_SYSREG_OP1_MASK 1259 | KVM_REG_ARM64_SYSREG_CRN_MASK 1260 | KVM_REG_ARM64_SYSREG_CRM_MASK 1261 | KVM_REG_ARM64_SYSREG_OP2_MASK)) 1262 return false; 1263 params->Op0 = ((id & KVM_REG_ARM64_SYSREG_OP0_MASK) 1264 >> KVM_REG_ARM64_SYSREG_OP0_SHIFT); 1265 params->Op1 = ((id & KVM_REG_ARM64_SYSREG_OP1_MASK) 1266 >> KVM_REG_ARM64_SYSREG_OP1_SHIFT); 1267 params->CRn = ((id & KVM_REG_ARM64_SYSREG_CRN_MASK) 1268 >> KVM_REG_ARM64_SYSREG_CRN_SHIFT); 1269 params->CRm = ((id & KVM_REG_ARM64_SYSREG_CRM_MASK) 1270 >> KVM_REG_ARM64_SYSREG_CRM_SHIFT); 1271 params->Op2 = ((id & KVM_REG_ARM64_SYSREG_OP2_MASK) 1272 >> KVM_REG_ARM64_SYSREG_OP2_SHIFT); 1273 return true; 1274 default: 1275 return false; 1276 } 1277 } 1278 1279 /* Decode an index value, and find the sys_reg_desc entry. */ 1280 static const struct sys_reg_desc *index_to_sys_reg_desc(struct kvm_vcpu *vcpu, 1281 u64 id) 1282 { 1283 size_t num; 1284 const struct sys_reg_desc *table, *r; 1285 struct sys_reg_params params; 1286 1287 /* We only do sys_reg for now. */ 1288 if ((id & KVM_REG_ARM_COPROC_MASK) != KVM_REG_ARM64_SYSREG) 1289 return NULL; 1290 1291 if (!index_to_params(id, ¶ms)) 1292 return NULL; 1293 1294 table = get_target_table(vcpu->arch.target, true, &num); 1295 r = find_reg(¶ms, table, num); 1296 if (!r) 1297 r = find_reg(¶ms, sys_reg_descs, ARRAY_SIZE(sys_reg_descs)); 1298 1299 /* Not saved in the sys_reg array? */ 1300 if (r && !r->reg) 1301 r = NULL; 1302 1303 return r; 1304 } 1305 1306 /* 1307 * These are the invariant sys_reg registers: we let the guest see the 1308 * host versions of these, so they're part of the guest state. 1309 * 1310 * A future CPU may provide a mechanism to present different values to 1311 * the guest, or a future kvm may trap them. 1312 */ 1313 1314 #define FUNCTION_INVARIANT(reg) \ 1315 static void get_##reg(struct kvm_vcpu *v, \ 1316 const struct sys_reg_desc *r) \ 1317 { \ 1318 u64 val; \ 1319 \ 1320 asm volatile("mrs %0, " __stringify(reg) "\n" \ 1321 : "=r" (val)); \ 1322 ((struct sys_reg_desc *)r)->val = val; \ 1323 } 1324 1325 FUNCTION_INVARIANT(midr_el1) 1326 FUNCTION_INVARIANT(ctr_el0) 1327 FUNCTION_INVARIANT(revidr_el1) 1328 FUNCTION_INVARIANT(id_pfr0_el1) 1329 FUNCTION_INVARIANT(id_pfr1_el1) 1330 FUNCTION_INVARIANT(id_dfr0_el1) 1331 FUNCTION_INVARIANT(id_afr0_el1) 1332 FUNCTION_INVARIANT(id_mmfr0_el1) 1333 FUNCTION_INVARIANT(id_mmfr1_el1) 1334 FUNCTION_INVARIANT(id_mmfr2_el1) 1335 FUNCTION_INVARIANT(id_mmfr3_el1) 1336 FUNCTION_INVARIANT(id_isar0_el1) 1337 FUNCTION_INVARIANT(id_isar1_el1) 1338 FUNCTION_INVARIANT(id_isar2_el1) 1339 FUNCTION_INVARIANT(id_isar3_el1) 1340 FUNCTION_INVARIANT(id_isar4_el1) 1341 FUNCTION_INVARIANT(id_isar5_el1) 1342 FUNCTION_INVARIANT(clidr_el1) 1343 FUNCTION_INVARIANT(aidr_el1) 1344 1345 /* ->val is filled in by kvm_sys_reg_table_init() */ 1346 static struct sys_reg_desc invariant_sys_regs[] = { 1347 { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0000), Op2(0b000), 1348 NULL, get_midr_el1 }, 1349 { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0000), Op2(0b110), 1350 NULL, get_revidr_el1 }, 1351 { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b000), 1352 NULL, get_id_pfr0_el1 }, 1353 { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b001), 1354 NULL, get_id_pfr1_el1 }, 1355 { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b010), 1356 NULL, get_id_dfr0_el1 }, 1357 { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b011), 1358 NULL, get_id_afr0_el1 }, 1359 { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b100), 1360 NULL, get_id_mmfr0_el1 }, 1361 { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b101), 1362 NULL, get_id_mmfr1_el1 }, 1363 { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b110), 1364 NULL, get_id_mmfr2_el1 }, 1365 { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b111), 1366 NULL, get_id_mmfr3_el1 }, 1367 { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b000), 1368 NULL, get_id_isar0_el1 }, 1369 { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b001), 1370 NULL, get_id_isar1_el1 }, 1371 { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b010), 1372 NULL, get_id_isar2_el1 }, 1373 { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b011), 1374 NULL, get_id_isar3_el1 }, 1375 { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b100), 1376 NULL, get_id_isar4_el1 }, 1377 { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b101), 1378 NULL, get_id_isar5_el1 }, 1379 { Op0(0b11), Op1(0b001), CRn(0b0000), CRm(0b0000), Op2(0b001), 1380 NULL, get_clidr_el1 }, 1381 { Op0(0b11), Op1(0b001), CRn(0b0000), CRm(0b0000), Op2(0b111), 1382 NULL, get_aidr_el1 }, 1383 { Op0(0b11), Op1(0b011), CRn(0b0000), CRm(0b0000), Op2(0b001), 1384 NULL, get_ctr_el0 }, 1385 }; 1386 1387 static int reg_from_user(u64 *val, const void __user *uaddr, u64 id) 1388 { 1389 if (copy_from_user(val, uaddr, KVM_REG_SIZE(id)) != 0) 1390 return -EFAULT; 1391 return 0; 1392 } 1393 1394 static int reg_to_user(void __user *uaddr, const u64 *val, u64 id) 1395 { 1396 if (copy_to_user(uaddr, val, KVM_REG_SIZE(id)) != 0) 1397 return -EFAULT; 1398 return 0; 1399 } 1400 1401 static int get_invariant_sys_reg(u64 id, void __user *uaddr) 1402 { 1403 struct sys_reg_params params; 1404 const struct sys_reg_desc *r; 1405 1406 if (!index_to_params(id, ¶ms)) 1407 return -ENOENT; 1408 1409 r = find_reg(¶ms, invariant_sys_regs, ARRAY_SIZE(invariant_sys_regs)); 1410 if (!r) 1411 return -ENOENT; 1412 1413 return reg_to_user(uaddr, &r->val, id); 1414 } 1415 1416 static int set_invariant_sys_reg(u64 id, void __user *uaddr) 1417 { 1418 struct sys_reg_params params; 1419 const struct sys_reg_desc *r; 1420 int err; 1421 u64 val = 0; /* Make sure high bits are 0 for 32-bit regs */ 1422 1423 if (!index_to_params(id, ¶ms)) 1424 return -ENOENT; 1425 r = find_reg(¶ms, invariant_sys_regs, ARRAY_SIZE(invariant_sys_regs)); 1426 if (!r) 1427 return -ENOENT; 1428 1429 err = reg_from_user(&val, uaddr, id); 1430 if (err) 1431 return err; 1432 1433 /* This is what we mean by invariant: you can't change it. */ 1434 if (r->val != val) 1435 return -EINVAL; 1436 1437 return 0; 1438 } 1439 1440 static bool is_valid_cache(u32 val) 1441 { 1442 u32 level, ctype; 1443 1444 if (val >= CSSELR_MAX) 1445 return false; 1446 1447 /* Bottom bit is Instruction or Data bit. Next 3 bits are level. */ 1448 level = (val >> 1); 1449 ctype = (cache_levels >> (level * 3)) & 7; 1450 1451 switch (ctype) { 1452 case 0: /* No cache */ 1453 return false; 1454 case 1: /* Instruction cache only */ 1455 return (val & 1); 1456 case 2: /* Data cache only */ 1457 case 4: /* Unified cache */ 1458 return !(val & 1); 1459 case 3: /* Separate instruction and data caches */ 1460 return true; 1461 default: /* Reserved: we can't know instruction or data. */ 1462 return false; 1463 } 1464 } 1465 1466 static int demux_c15_get(u64 id, void __user *uaddr) 1467 { 1468 u32 val; 1469 u32 __user *uval = uaddr; 1470 1471 /* Fail if we have unknown bits set. */ 1472 if (id & ~(KVM_REG_ARCH_MASK|KVM_REG_SIZE_MASK|KVM_REG_ARM_COPROC_MASK 1473 | ((1 << KVM_REG_ARM_COPROC_SHIFT)-1))) 1474 return -ENOENT; 1475 1476 switch (id & KVM_REG_ARM_DEMUX_ID_MASK) { 1477 case KVM_REG_ARM_DEMUX_ID_CCSIDR: 1478 if (KVM_REG_SIZE(id) != 4) 1479 return -ENOENT; 1480 val = (id & KVM_REG_ARM_DEMUX_VAL_MASK) 1481 >> KVM_REG_ARM_DEMUX_VAL_SHIFT; 1482 if (!is_valid_cache(val)) 1483 return -ENOENT; 1484 1485 return put_user(get_ccsidr(val), uval); 1486 default: 1487 return -ENOENT; 1488 } 1489 } 1490 1491 static int demux_c15_set(u64 id, void __user *uaddr) 1492 { 1493 u32 val, newval; 1494 u32 __user *uval = uaddr; 1495 1496 /* Fail if we have unknown bits set. */ 1497 if (id & ~(KVM_REG_ARCH_MASK|KVM_REG_SIZE_MASK|KVM_REG_ARM_COPROC_MASK 1498 | ((1 << KVM_REG_ARM_COPROC_SHIFT)-1))) 1499 return -ENOENT; 1500 1501 switch (id & KVM_REG_ARM_DEMUX_ID_MASK) { 1502 case KVM_REG_ARM_DEMUX_ID_CCSIDR: 1503 if (KVM_REG_SIZE(id) != 4) 1504 return -ENOENT; 1505 val = (id & KVM_REG_ARM_DEMUX_VAL_MASK) 1506 >> KVM_REG_ARM_DEMUX_VAL_SHIFT; 1507 if (!is_valid_cache(val)) 1508 return -ENOENT; 1509 1510 if (get_user(newval, uval)) 1511 return -EFAULT; 1512 1513 /* This is also invariant: you can't change it. */ 1514 if (newval != get_ccsidr(val)) 1515 return -EINVAL; 1516 return 0; 1517 default: 1518 return -ENOENT; 1519 } 1520 } 1521 1522 int kvm_arm_sys_reg_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) 1523 { 1524 const struct sys_reg_desc *r; 1525 void __user *uaddr = (void __user *)(unsigned long)reg->addr; 1526 1527 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_DEMUX) 1528 return demux_c15_get(reg->id, uaddr); 1529 1530 if (KVM_REG_SIZE(reg->id) != sizeof(__u64)) 1531 return -ENOENT; 1532 1533 r = index_to_sys_reg_desc(vcpu, reg->id); 1534 if (!r) 1535 return get_invariant_sys_reg(reg->id, uaddr); 1536 1537 if (r->get_user) 1538 return (r->get_user)(vcpu, r, reg, uaddr); 1539 1540 return reg_to_user(uaddr, &vcpu_sys_reg(vcpu, r->reg), reg->id); 1541 } 1542 1543 int kvm_arm_sys_reg_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) 1544 { 1545 const struct sys_reg_desc *r; 1546 void __user *uaddr = (void __user *)(unsigned long)reg->addr; 1547 1548 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_DEMUX) 1549 return demux_c15_set(reg->id, uaddr); 1550 1551 if (KVM_REG_SIZE(reg->id) != sizeof(__u64)) 1552 return -ENOENT; 1553 1554 r = index_to_sys_reg_desc(vcpu, reg->id); 1555 if (!r) 1556 return set_invariant_sys_reg(reg->id, uaddr); 1557 1558 if (r->set_user) 1559 return (r->set_user)(vcpu, r, reg, uaddr); 1560 1561 return reg_from_user(&vcpu_sys_reg(vcpu, r->reg), uaddr, reg->id); 1562 } 1563 1564 static unsigned int num_demux_regs(void) 1565 { 1566 unsigned int i, count = 0; 1567 1568 for (i = 0; i < CSSELR_MAX; i++) 1569 if (is_valid_cache(i)) 1570 count++; 1571 1572 return count; 1573 } 1574 1575 static int write_demux_regids(u64 __user *uindices) 1576 { 1577 u64 val = KVM_REG_ARM64 | KVM_REG_SIZE_U32 | KVM_REG_ARM_DEMUX; 1578 unsigned int i; 1579 1580 val |= KVM_REG_ARM_DEMUX_ID_CCSIDR; 1581 for (i = 0; i < CSSELR_MAX; i++) { 1582 if (!is_valid_cache(i)) 1583 continue; 1584 if (put_user(val | i, uindices)) 1585 return -EFAULT; 1586 uindices++; 1587 } 1588 return 0; 1589 } 1590 1591 static u64 sys_reg_to_index(const struct sys_reg_desc *reg) 1592 { 1593 return (KVM_REG_ARM64 | KVM_REG_SIZE_U64 | 1594 KVM_REG_ARM64_SYSREG | 1595 (reg->Op0 << KVM_REG_ARM64_SYSREG_OP0_SHIFT) | 1596 (reg->Op1 << KVM_REG_ARM64_SYSREG_OP1_SHIFT) | 1597 (reg->CRn << KVM_REG_ARM64_SYSREG_CRN_SHIFT) | 1598 (reg->CRm << KVM_REG_ARM64_SYSREG_CRM_SHIFT) | 1599 (reg->Op2 << KVM_REG_ARM64_SYSREG_OP2_SHIFT)); 1600 } 1601 1602 static bool copy_reg_to_user(const struct sys_reg_desc *reg, u64 __user **uind) 1603 { 1604 if (!*uind) 1605 return true; 1606 1607 if (put_user(sys_reg_to_index(reg), *uind)) 1608 return false; 1609 1610 (*uind)++; 1611 return true; 1612 } 1613 1614 /* Assumed ordered tables, see kvm_sys_reg_table_init. */ 1615 static int walk_sys_regs(struct kvm_vcpu *vcpu, u64 __user *uind) 1616 { 1617 const struct sys_reg_desc *i1, *i2, *end1, *end2; 1618 unsigned int total = 0; 1619 size_t num; 1620 1621 /* We check for duplicates here, to allow arch-specific overrides. */ 1622 i1 = get_target_table(vcpu->arch.target, true, &num); 1623 end1 = i1 + num; 1624 i2 = sys_reg_descs; 1625 end2 = sys_reg_descs + ARRAY_SIZE(sys_reg_descs); 1626 1627 BUG_ON(i1 == end1 || i2 == end2); 1628 1629 /* Walk carefully, as both tables may refer to the same register. */ 1630 while (i1 || i2) { 1631 int cmp = cmp_sys_reg(i1, i2); 1632 /* target-specific overrides generic entry. */ 1633 if (cmp <= 0) { 1634 /* Ignore registers we trap but don't save. */ 1635 if (i1->reg) { 1636 if (!copy_reg_to_user(i1, &uind)) 1637 return -EFAULT; 1638 total++; 1639 } 1640 } else { 1641 /* Ignore registers we trap but don't save. */ 1642 if (i2->reg) { 1643 if (!copy_reg_to_user(i2, &uind)) 1644 return -EFAULT; 1645 total++; 1646 } 1647 } 1648 1649 if (cmp <= 0 && ++i1 == end1) 1650 i1 = NULL; 1651 if (cmp >= 0 && ++i2 == end2) 1652 i2 = NULL; 1653 } 1654 return total; 1655 } 1656 1657 unsigned long kvm_arm_num_sys_reg_descs(struct kvm_vcpu *vcpu) 1658 { 1659 return ARRAY_SIZE(invariant_sys_regs) 1660 + num_demux_regs() 1661 + walk_sys_regs(vcpu, (u64 __user *)NULL); 1662 } 1663 1664 int kvm_arm_copy_sys_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices) 1665 { 1666 unsigned int i; 1667 int err; 1668 1669 /* Then give them all the invariant registers' indices. */ 1670 for (i = 0; i < ARRAY_SIZE(invariant_sys_regs); i++) { 1671 if (put_user(sys_reg_to_index(&invariant_sys_regs[i]), uindices)) 1672 return -EFAULT; 1673 uindices++; 1674 } 1675 1676 err = walk_sys_regs(vcpu, uindices); 1677 if (err < 0) 1678 return err; 1679 uindices += err; 1680 1681 return write_demux_regids(uindices); 1682 } 1683 1684 static int check_sysreg_table(const struct sys_reg_desc *table, unsigned int n) 1685 { 1686 unsigned int i; 1687 1688 for (i = 1; i < n; i++) { 1689 if (cmp_sys_reg(&table[i-1], &table[i]) >= 0) { 1690 kvm_err("sys_reg table %p out of order (%d)\n", table, i - 1); 1691 return 1; 1692 } 1693 } 1694 1695 return 0; 1696 } 1697 1698 void kvm_sys_reg_table_init(void) 1699 { 1700 unsigned int i; 1701 struct sys_reg_desc clidr; 1702 1703 /* Make sure tables are unique and in order. */ 1704 BUG_ON(check_sysreg_table(sys_reg_descs, ARRAY_SIZE(sys_reg_descs))); 1705 BUG_ON(check_sysreg_table(cp14_regs, ARRAY_SIZE(cp14_regs))); 1706 BUG_ON(check_sysreg_table(cp14_64_regs, ARRAY_SIZE(cp14_64_regs))); 1707 BUG_ON(check_sysreg_table(cp15_regs, ARRAY_SIZE(cp15_regs))); 1708 BUG_ON(check_sysreg_table(cp15_64_regs, ARRAY_SIZE(cp15_64_regs))); 1709 BUG_ON(check_sysreg_table(invariant_sys_regs, ARRAY_SIZE(invariant_sys_regs))); 1710 1711 /* We abuse the reset function to overwrite the table itself. */ 1712 for (i = 0; i < ARRAY_SIZE(invariant_sys_regs); i++) 1713 invariant_sys_regs[i].reset(NULL, &invariant_sys_regs[i]); 1714 1715 /* 1716 * CLIDR format is awkward, so clean it up. See ARM B4.1.20: 1717 * 1718 * If software reads the Cache Type fields from Ctype1 1719 * upwards, once it has seen a value of 0b000, no caches 1720 * exist at further-out levels of the hierarchy. So, for 1721 * example, if Ctype3 is the first Cache Type field with a 1722 * value of 0b000, the values of Ctype4 to Ctype7 must be 1723 * ignored. 1724 */ 1725 get_clidr_el1(NULL, &clidr); /* Ugly... */ 1726 cache_levels = clidr.val; 1727 for (i = 0; i < 7; i++) 1728 if (((cache_levels >> (i*3)) & 7) == 0) 1729 break; 1730 /* Clear all higher bits. */ 1731 cache_levels &= (1 << (i*3))-1; 1732 } 1733 1734 /** 1735 * kvm_reset_sys_regs - sets system registers to reset value 1736 * @vcpu: The VCPU pointer 1737 * 1738 * This function finds the right table above and sets the registers on the 1739 * virtual CPU struct to their architecturally defined reset values. 1740 */ 1741 void kvm_reset_sys_regs(struct kvm_vcpu *vcpu) 1742 { 1743 size_t num; 1744 const struct sys_reg_desc *table; 1745 1746 /* Catch someone adding a register without putting in reset entry. */ 1747 memset(&vcpu->arch.ctxt.sys_regs, 0x42, sizeof(vcpu->arch.ctxt.sys_regs)); 1748 1749 /* Generic chip reset first (so target could override). */ 1750 reset_sys_reg_descs(vcpu, sys_reg_descs, ARRAY_SIZE(sys_reg_descs)); 1751 1752 table = get_target_table(vcpu->arch.target, true, &num); 1753 reset_sys_reg_descs(vcpu, table, num); 1754 1755 for (num = 1; num < NR_SYS_REGS; num++) 1756 if (vcpu_sys_reg(vcpu, num) == 0x4242424242424242) 1757 panic("Didn't reset vcpu_sys_reg(%zi)", num); 1758 } 1759