1 /* 2 * handling privileged instructions 3 * 4 * Copyright IBM Corp. 2008, 2013 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License (version 2 only) 8 * as published by the Free Software Foundation. 9 * 10 * Author(s): Carsten Otte <cotte@de.ibm.com> 11 * Christian Borntraeger <borntraeger@de.ibm.com> 12 */ 13 14 #include <linux/kvm.h> 15 #include <linux/gfp.h> 16 #include <linux/errno.h> 17 #include <linux/compat.h> 18 #include <asm/asm-offsets.h> 19 #include <asm/facility.h> 20 #include <asm/current.h> 21 #include <asm/debug.h> 22 #include <asm/ebcdic.h> 23 #include <asm/sysinfo.h> 24 #include <asm/pgtable.h> 25 #include <asm/pgalloc.h> 26 #include <asm/io.h> 27 #include <asm/ptrace.h> 28 #include <asm/compat.h> 29 #include "gaccess.h" 30 #include "kvm-s390.h" 31 #include "trace.h" 32 33 static int handle_set_prefix(struct kvm_vcpu *vcpu) 34 { 35 u64 operand2; 36 u32 address = 0; 37 u8 tmp; 38 39 vcpu->stat.instruction_spx++; 40 41 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 42 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 43 44 operand2 = kvm_s390_get_base_disp_s(vcpu); 45 46 /* must be word boundary */ 47 if (operand2 & 3) 48 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 49 50 /* get the value */ 51 if (get_guest(vcpu, address, (u32 __user *) operand2)) 52 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 53 54 address = address & 0x7fffe000u; 55 56 /* make sure that the new value is valid memory */ 57 if (copy_from_guest_absolute(vcpu, &tmp, address, 1) || 58 (copy_from_guest_absolute(vcpu, &tmp, address + PAGE_SIZE, 1))) 59 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 60 61 kvm_s390_set_prefix(vcpu, address); 62 63 VCPU_EVENT(vcpu, 5, "setting prefix to %x", address); 64 trace_kvm_s390_handle_prefix(vcpu, 1, address); 65 return 0; 66 } 67 68 static int handle_store_prefix(struct kvm_vcpu *vcpu) 69 { 70 u64 operand2; 71 u32 address; 72 73 vcpu->stat.instruction_stpx++; 74 75 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 76 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 77 78 operand2 = kvm_s390_get_base_disp_s(vcpu); 79 80 /* must be word boundary */ 81 if (operand2 & 3) 82 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 83 84 address = vcpu->arch.sie_block->prefix; 85 address = address & 0x7fffe000u; 86 87 /* get the value */ 88 if (put_guest(vcpu, address, (u32 __user *)operand2)) 89 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 90 91 VCPU_EVENT(vcpu, 5, "storing prefix to %x", address); 92 trace_kvm_s390_handle_prefix(vcpu, 0, address); 93 return 0; 94 } 95 96 static int handle_store_cpu_address(struct kvm_vcpu *vcpu) 97 { 98 u64 useraddr; 99 100 vcpu->stat.instruction_stap++; 101 102 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 103 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 104 105 useraddr = kvm_s390_get_base_disp_s(vcpu); 106 107 if (useraddr & 1) 108 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 109 110 if (put_guest(vcpu, vcpu->vcpu_id, (u16 __user *)useraddr)) 111 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 112 113 VCPU_EVENT(vcpu, 5, "storing cpu address to %llx", useraddr); 114 trace_kvm_s390_handle_stap(vcpu, useraddr); 115 return 0; 116 } 117 118 static int handle_skey(struct kvm_vcpu *vcpu) 119 { 120 vcpu->stat.instruction_storage_key++; 121 122 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 123 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 124 125 vcpu->arch.sie_block->gpsw.addr = 126 __rewind_psw(vcpu->arch.sie_block->gpsw, 4); 127 VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation"); 128 return 0; 129 } 130 131 static int handle_tpi(struct kvm_vcpu *vcpu) 132 { 133 struct kvm_s390_interrupt_info *inti; 134 u64 addr; 135 int cc; 136 137 addr = kvm_s390_get_base_disp_s(vcpu); 138 if (addr & 3) 139 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 140 cc = 0; 141 inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->run->s.regs.crs[6], 0); 142 if (!inti) 143 goto no_interrupt; 144 cc = 1; 145 if (addr) { 146 /* 147 * Store the two-word I/O interruption code into the 148 * provided area. 149 */ 150 if (put_guest(vcpu, inti->io.subchannel_id, (u16 __user *)addr) 151 || put_guest(vcpu, inti->io.subchannel_nr, (u16 __user *)(addr + 2)) 152 || put_guest(vcpu, inti->io.io_int_parm, (u32 __user *)(addr + 4))) 153 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 154 } else { 155 /* 156 * Store the three-word I/O interruption code into 157 * the appropriate lowcore area. 158 */ 159 put_guest(vcpu, inti->io.subchannel_id, (u16 __user *) __LC_SUBCHANNEL_ID); 160 put_guest(vcpu, inti->io.subchannel_nr, (u16 __user *) __LC_SUBCHANNEL_NR); 161 put_guest(vcpu, inti->io.io_int_parm, (u32 __user *) __LC_IO_INT_PARM); 162 put_guest(vcpu, inti->io.io_int_word, (u32 __user *) __LC_IO_INT_WORD); 163 } 164 kfree(inti); 165 no_interrupt: 166 /* Set condition code and we're done. */ 167 vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44); 168 vcpu->arch.sie_block->gpsw.mask |= (cc & 3ul) << 44; 169 return 0; 170 } 171 172 static int handle_tsch(struct kvm_vcpu *vcpu) 173 { 174 struct kvm_s390_interrupt_info *inti; 175 176 inti = kvm_s390_get_io_int(vcpu->kvm, 0, 177 vcpu->run->s.regs.gprs[1]); 178 179 /* 180 * Prepare exit to userspace. 181 * We indicate whether we dequeued a pending I/O interrupt 182 * so that userspace can re-inject it if the instruction gets 183 * a program check. While this may re-order the pending I/O 184 * interrupts, this is no problem since the priority is kept 185 * intact. 186 */ 187 vcpu->run->exit_reason = KVM_EXIT_S390_TSCH; 188 vcpu->run->s390_tsch.dequeued = !!inti; 189 if (inti) { 190 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id; 191 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr; 192 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm; 193 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word; 194 } 195 vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb; 196 kfree(inti); 197 return -EREMOTE; 198 } 199 200 static int handle_io_inst(struct kvm_vcpu *vcpu) 201 { 202 VCPU_EVENT(vcpu, 4, "%s", "I/O instruction"); 203 204 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 205 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 206 207 if (vcpu->kvm->arch.css_support) { 208 /* 209 * Most I/O instructions will be handled by userspace. 210 * Exceptions are tpi and the interrupt portion of tsch. 211 */ 212 if (vcpu->arch.sie_block->ipa == 0xb236) 213 return handle_tpi(vcpu); 214 if (vcpu->arch.sie_block->ipa == 0xb235) 215 return handle_tsch(vcpu); 216 /* Handle in userspace. */ 217 return -EOPNOTSUPP; 218 } else { 219 /* 220 * Set condition code 3 to stop the guest from issueing channel 221 * I/O instructions. 222 */ 223 vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44); 224 vcpu->arch.sie_block->gpsw.mask |= (3 & 3ul) << 44; 225 return 0; 226 } 227 } 228 229 static int handle_stfl(struct kvm_vcpu *vcpu) 230 { 231 unsigned int facility_list; 232 int rc; 233 234 vcpu->stat.instruction_stfl++; 235 236 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 237 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 238 239 /* only pass the facility bits, which we can handle */ 240 facility_list = S390_lowcore.stfl_fac_list & 0xff82fff3; 241 242 rc = copy_to_guest(vcpu, offsetof(struct _lowcore, stfl_fac_list), 243 &facility_list, sizeof(facility_list)); 244 if (rc) 245 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 246 VCPU_EVENT(vcpu, 5, "store facility list value %x", facility_list); 247 trace_kvm_s390_handle_stfl(vcpu, facility_list); 248 return 0; 249 } 250 251 static void handle_new_psw(struct kvm_vcpu *vcpu) 252 { 253 /* Check whether the new psw is enabled for machine checks. */ 254 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK) 255 kvm_s390_deliver_pending_machine_checks(vcpu); 256 } 257 258 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA) 259 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL 260 #define PSW_ADDR_24 0x0000000000ffffffUL 261 #define PSW_ADDR_31 0x000000007fffffffUL 262 263 static int is_valid_psw(psw_t *psw) { 264 if (psw->mask & PSW_MASK_UNASSIGNED) 265 return 0; 266 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) { 267 if (psw->addr & ~PSW_ADDR_31) 268 return 0; 269 } 270 if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24)) 271 return 0; 272 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_EA) 273 return 0; 274 return 1; 275 } 276 277 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu) 278 { 279 psw_t *gpsw = &vcpu->arch.sie_block->gpsw; 280 psw_compat_t new_psw; 281 u64 addr; 282 283 if (gpsw->mask & PSW_MASK_PSTATE) 284 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 285 286 addr = kvm_s390_get_base_disp_s(vcpu); 287 if (addr & 7) 288 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 289 if (copy_from_guest(vcpu, &new_psw, addr, sizeof(new_psw))) 290 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 291 if (!(new_psw.mask & PSW32_MASK_BASE)) 292 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 293 gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32; 294 gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE; 295 gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE; 296 if (!is_valid_psw(gpsw)) 297 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 298 handle_new_psw(vcpu); 299 return 0; 300 } 301 302 static int handle_lpswe(struct kvm_vcpu *vcpu) 303 { 304 psw_t new_psw; 305 u64 addr; 306 307 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 308 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 309 310 addr = kvm_s390_get_base_disp_s(vcpu); 311 if (addr & 7) 312 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 313 if (copy_from_guest(vcpu, &new_psw, addr, sizeof(new_psw))) 314 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 315 vcpu->arch.sie_block->gpsw = new_psw; 316 if (!is_valid_psw(&vcpu->arch.sie_block->gpsw)) 317 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 318 handle_new_psw(vcpu); 319 return 0; 320 } 321 322 static int handle_stidp(struct kvm_vcpu *vcpu) 323 { 324 u64 operand2; 325 326 vcpu->stat.instruction_stidp++; 327 328 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 329 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 330 331 operand2 = kvm_s390_get_base_disp_s(vcpu); 332 333 if (operand2 & 7) 334 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 335 336 if (put_guest(vcpu, vcpu->arch.stidp_data, (u64 __user *)operand2)) 337 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 338 339 VCPU_EVENT(vcpu, 5, "%s", "store cpu id"); 340 return 0; 341 } 342 343 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem) 344 { 345 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; 346 int cpus = 0; 347 int n; 348 349 spin_lock(&fi->lock); 350 for (n = 0; n < KVM_MAX_VCPUS; n++) 351 if (fi->local_int[n]) 352 cpus++; 353 spin_unlock(&fi->lock); 354 355 /* deal with other level 3 hypervisors */ 356 if (stsi(mem, 3, 2, 2)) 357 mem->count = 0; 358 if (mem->count < 8) 359 mem->count++; 360 for (n = mem->count - 1; n > 0 ; n--) 361 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0])); 362 363 mem->vm[0].cpus_total = cpus; 364 mem->vm[0].cpus_configured = cpus; 365 mem->vm[0].cpus_standby = 0; 366 mem->vm[0].cpus_reserved = 0; 367 mem->vm[0].caf = 1000; 368 memcpy(mem->vm[0].name, "KVMguest", 8); 369 ASCEBC(mem->vm[0].name, 8); 370 memcpy(mem->vm[0].cpi, "KVM/Linux ", 16); 371 ASCEBC(mem->vm[0].cpi, 16); 372 } 373 374 static int handle_stsi(struct kvm_vcpu *vcpu) 375 { 376 int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28; 377 int sel1 = vcpu->run->s.regs.gprs[0] & 0xff; 378 int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff; 379 unsigned long mem = 0; 380 u64 operand2; 381 int rc = 0; 382 383 vcpu->stat.instruction_stsi++; 384 VCPU_EVENT(vcpu, 4, "stsi: fc: %x sel1: %x sel2: %x", fc, sel1, sel2); 385 386 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 387 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 388 389 if (fc > 3) { 390 vcpu->arch.sie_block->gpsw.mask |= 3ul << 44; /* cc 3 */ 391 return 0; 392 } 393 394 if (vcpu->run->s.regs.gprs[0] & 0x0fffff00 395 || vcpu->run->s.regs.gprs[1] & 0xffff0000) 396 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 397 398 if (fc == 0) { 399 vcpu->run->s.regs.gprs[0] = 3 << 28; 400 vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44); /* cc 0 */ 401 return 0; 402 } 403 404 operand2 = kvm_s390_get_base_disp_s(vcpu); 405 406 if (operand2 & 0xfff) 407 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 408 409 switch (fc) { 410 case 1: /* same handling for 1 and 2 */ 411 case 2: 412 mem = get_zeroed_page(GFP_KERNEL); 413 if (!mem) 414 goto out_no_data; 415 if (stsi((void *) mem, fc, sel1, sel2)) 416 goto out_no_data; 417 break; 418 case 3: 419 if (sel1 != 2 || sel2 != 2) 420 goto out_no_data; 421 mem = get_zeroed_page(GFP_KERNEL); 422 if (!mem) 423 goto out_no_data; 424 handle_stsi_3_2_2(vcpu, (void *) mem); 425 break; 426 } 427 428 if (copy_to_guest_absolute(vcpu, operand2, (void *) mem, PAGE_SIZE)) { 429 rc = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 430 goto out_exception; 431 } 432 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2); 433 free_page(mem); 434 vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44); 435 vcpu->run->s.regs.gprs[0] = 0; 436 return 0; 437 out_no_data: 438 /* condition code 3 */ 439 vcpu->arch.sie_block->gpsw.mask |= 3ul << 44; 440 out_exception: 441 free_page(mem); 442 return rc; 443 } 444 445 static const intercept_handler_t b2_handlers[256] = { 446 [0x02] = handle_stidp, 447 [0x10] = handle_set_prefix, 448 [0x11] = handle_store_prefix, 449 [0x12] = handle_store_cpu_address, 450 [0x29] = handle_skey, 451 [0x2a] = handle_skey, 452 [0x2b] = handle_skey, 453 [0x30] = handle_io_inst, 454 [0x31] = handle_io_inst, 455 [0x32] = handle_io_inst, 456 [0x33] = handle_io_inst, 457 [0x34] = handle_io_inst, 458 [0x35] = handle_io_inst, 459 [0x36] = handle_io_inst, 460 [0x37] = handle_io_inst, 461 [0x38] = handle_io_inst, 462 [0x39] = handle_io_inst, 463 [0x3a] = handle_io_inst, 464 [0x3b] = handle_io_inst, 465 [0x3c] = handle_io_inst, 466 [0x5f] = handle_io_inst, 467 [0x74] = handle_io_inst, 468 [0x76] = handle_io_inst, 469 [0x7d] = handle_stsi, 470 [0xb1] = handle_stfl, 471 [0xb2] = handle_lpswe, 472 }; 473 474 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu) 475 { 476 intercept_handler_t handler; 477 478 /* 479 * A lot of B2 instructions are priviledged. Here we check for 480 * the privileged ones, that we can handle in the kernel. 481 * Anything else goes to userspace. 482 */ 483 handler = b2_handlers[vcpu->arch.sie_block->ipa & 0x00ff]; 484 if (handler) 485 return handler(vcpu); 486 487 return -EOPNOTSUPP; 488 } 489 490 static int handle_epsw(struct kvm_vcpu *vcpu) 491 { 492 int reg1, reg2; 493 494 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 495 496 /* This basically extracts the mask half of the psw. */ 497 vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000; 498 vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32; 499 if (reg2) { 500 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000; 501 vcpu->run->s.regs.gprs[reg2] |= 502 vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffff; 503 } 504 return 0; 505 } 506 507 #define PFMF_RESERVED 0xfffc0101UL 508 #define PFMF_SK 0x00020000UL 509 #define PFMF_CF 0x00010000UL 510 #define PFMF_UI 0x00008000UL 511 #define PFMF_FSC 0x00007000UL 512 #define PFMF_NQ 0x00000800UL 513 #define PFMF_MR 0x00000400UL 514 #define PFMF_MC 0x00000200UL 515 #define PFMF_KEY 0x000000feUL 516 517 static int handle_pfmf(struct kvm_vcpu *vcpu) 518 { 519 int reg1, reg2; 520 unsigned long start, end; 521 522 vcpu->stat.instruction_pfmf++; 523 524 kvm_s390_get_regs_rre(vcpu, ®1, ®2); 525 526 if (!MACHINE_HAS_PFMF) 527 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); 528 529 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 530 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 531 532 if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED) 533 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 534 535 /* Only provide non-quiescing support if the host supports it */ 536 if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ && !test_facility(14)) 537 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 538 539 /* No support for conditional-SSKE */ 540 if (vcpu->run->s.regs.gprs[reg1] & (PFMF_MR | PFMF_MC)) 541 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 542 543 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; 544 switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) { 545 case 0x00000000: 546 end = (start + (1UL << 12)) & ~((1UL << 12) - 1); 547 break; 548 case 0x00001000: 549 end = (start + (1UL << 20)) & ~((1UL << 20) - 1); 550 break; 551 /* We dont support EDAT2 552 case 0x00002000: 553 end = (start + (1UL << 31)) & ~((1UL << 31) - 1); 554 break;*/ 555 default: 556 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 557 } 558 while (start < end) { 559 unsigned long useraddr; 560 561 useraddr = gmap_translate(start, vcpu->arch.gmap); 562 if (IS_ERR((void *)useraddr)) 563 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 564 565 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) { 566 if (clear_user((void __user *)useraddr, PAGE_SIZE)) 567 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 568 } 569 570 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) { 571 if (set_guest_storage_key(current->mm, useraddr, 572 vcpu->run->s.regs.gprs[reg1] & PFMF_KEY, 573 vcpu->run->s.regs.gprs[reg1] & PFMF_NQ)) 574 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 575 } 576 577 start += PAGE_SIZE; 578 } 579 if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) 580 vcpu->run->s.regs.gprs[reg2] = end; 581 return 0; 582 } 583 584 static const intercept_handler_t b9_handlers[256] = { 585 [0x8d] = handle_epsw, 586 [0x9c] = handle_io_inst, 587 [0xaf] = handle_pfmf, 588 }; 589 590 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu) 591 { 592 intercept_handler_t handler; 593 594 /* This is handled just as for the B2 instructions. */ 595 handler = b9_handlers[vcpu->arch.sie_block->ipa & 0x00ff]; 596 if (handler) 597 return handler(vcpu); 598 599 return -EOPNOTSUPP; 600 } 601 602 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu) 603 { 604 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 605 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 606 u64 useraddr; 607 u32 val = 0; 608 int reg, rc; 609 610 vcpu->stat.instruction_lctl++; 611 612 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 613 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 614 615 useraddr = kvm_s390_get_base_disp_rs(vcpu); 616 617 if (useraddr & 3) 618 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 619 620 VCPU_EVENT(vcpu, 5, "lctl r1:%x, r3:%x, addr:%llx", reg1, reg3, 621 useraddr); 622 trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, useraddr); 623 624 reg = reg1; 625 do { 626 rc = get_guest(vcpu, val, (u32 __user *) useraddr); 627 if (rc) 628 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 629 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul; 630 vcpu->arch.sie_block->gcr[reg] |= val; 631 useraddr += 4; 632 if (reg == reg3) 633 break; 634 reg = (reg + 1) % 16; 635 } while (1); 636 637 return 0; 638 } 639 640 static int handle_lctlg(struct kvm_vcpu *vcpu) 641 { 642 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; 643 int reg3 = vcpu->arch.sie_block->ipa & 0x000f; 644 u64 useraddr; 645 int reg, rc; 646 647 vcpu->stat.instruction_lctlg++; 648 649 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 650 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 651 652 useraddr = kvm_s390_get_base_disp_rsy(vcpu); 653 654 if (useraddr & 7) 655 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); 656 657 reg = reg1; 658 659 VCPU_EVENT(vcpu, 5, "lctlg r1:%x, r3:%x, addr:%llx", reg1, reg3, 660 useraddr); 661 trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, useraddr); 662 663 do { 664 rc = get_guest(vcpu, vcpu->arch.sie_block->gcr[reg], 665 (u64 __user *) useraddr); 666 if (rc) 667 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 668 useraddr += 8; 669 if (reg == reg3) 670 break; 671 reg = (reg + 1) % 16; 672 } while (1); 673 674 return 0; 675 } 676 677 static const intercept_handler_t eb_handlers[256] = { 678 [0x2f] = handle_lctlg, 679 [0x8a] = handle_io_inst, 680 }; 681 682 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu) 683 { 684 intercept_handler_t handler; 685 686 handler = eb_handlers[vcpu->arch.sie_block->ipb & 0xff]; 687 if (handler) 688 return handler(vcpu); 689 return -EOPNOTSUPP; 690 } 691 692 static int handle_tprot(struct kvm_vcpu *vcpu) 693 { 694 u64 address1, address2; 695 struct vm_area_struct *vma; 696 unsigned long user_address; 697 698 vcpu->stat.instruction_tprot++; 699 700 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 701 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 702 703 kvm_s390_get_base_disp_sse(vcpu, &address1, &address2); 704 705 /* we only handle the Linux memory detection case: 706 * access key == 0 707 * guest DAT == off 708 * everything else goes to userspace. */ 709 if (address2 & 0xf0) 710 return -EOPNOTSUPP; 711 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT) 712 return -EOPNOTSUPP; 713 714 down_read(¤t->mm->mmap_sem); 715 user_address = __gmap_translate(address1, vcpu->arch.gmap); 716 if (IS_ERR_VALUE(user_address)) 717 goto out_inject; 718 vma = find_vma(current->mm, user_address); 719 if (!vma) 720 goto out_inject; 721 vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44); 722 if (!(vma->vm_flags & VM_WRITE) && (vma->vm_flags & VM_READ)) 723 vcpu->arch.sie_block->gpsw.mask |= (1ul << 44); 724 if (!(vma->vm_flags & VM_WRITE) && !(vma->vm_flags & VM_READ)) 725 vcpu->arch.sie_block->gpsw.mask |= (2ul << 44); 726 727 up_read(¤t->mm->mmap_sem); 728 return 0; 729 730 out_inject: 731 up_read(¤t->mm->mmap_sem); 732 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); 733 } 734 735 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu) 736 { 737 /* For e5xx... instructions we only handle TPROT */ 738 if ((vcpu->arch.sie_block->ipa & 0x00ff) == 0x01) 739 return handle_tprot(vcpu); 740 return -EOPNOTSUPP; 741 } 742 743 static int handle_sckpf(struct kvm_vcpu *vcpu) 744 { 745 u32 value; 746 747 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) 748 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); 749 750 if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000) 751 return kvm_s390_inject_program_int(vcpu, 752 PGM_SPECIFICATION); 753 754 value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff; 755 vcpu->arch.sie_block->todpr = value; 756 757 return 0; 758 } 759 760 static const intercept_handler_t x01_handlers[256] = { 761 [0x07] = handle_sckpf, 762 }; 763 764 int kvm_s390_handle_01(struct kvm_vcpu *vcpu) 765 { 766 intercept_handler_t handler; 767 768 handler = x01_handlers[vcpu->arch.sie_block->ipa & 0x00ff]; 769 if (handler) 770 return handler(vcpu); 771 return -EOPNOTSUPP; 772 } 773