arch/s390/kvm/priv.c

   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 /* Handle SCK (SET CLOCK) interception */
  34 static int handle_set_clock(struct kvm_vcpu *vcpu)
  35 {
  36         struct kvm_vcpu *cpup;
  37         s64 hostclk, val;
  38         int i, rc;
  39         u64 op2;
  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         op2 = kvm_s390_get_base_disp_s(vcpu);
  45         if (op2 & 7)    /* Operand must be on a doubleword boundary */
  46                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
  47         rc = read_guest(vcpu, op2, &val, sizeof(val));
  48         if (rc)
  49                 return kvm_s390_inject_prog_cond(vcpu, rc);
  50
  51         if (store_tod_clock(&hostclk)) {
  52                 kvm_s390_set_psw_cc(vcpu, 3);
  53                 return 0;
  54         }
  55         val = (val - hostclk) & ~0x3fUL;
  56
  57         mutex_lock(&vcpu->kvm->lock);
  58         kvm_for_each_vcpu(i, cpup, vcpu->kvm)
  59                 cpup->arch.sie_block->epoch = val;
  60         mutex_unlock(&vcpu->kvm->lock);
  61
  62         kvm_s390_set_psw_cc(vcpu, 0);
  63         return 0;
  64 }
  65
  66 static int handle_set_prefix(struct kvm_vcpu *vcpu)
  67 {
  68         u64 operand2;
  69         u32 address;
  70         int rc;
  71
  72         vcpu->stat.instruction_spx++;
  73
  74         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
  75                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
  76
  77         operand2 = kvm_s390_get_base_disp_s(vcpu);
  78
  79         /* must be word boundary */
  80         if (operand2 & 3)
  81                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
  82
  83         /* get the value */
  84         rc = read_guest(vcpu, operand2, &address, sizeof(address));
  85         if (rc)
  86                 return kvm_s390_inject_prog_cond(vcpu, rc);
  87
  88         address &= 0x7fffe000u;
  89
  90         /*
  91          * Make sure the new value is valid memory. We only need to check the
  92          * first page, since address is 8k aligned and memory pieces are always
  93          * at least 1MB aligned and have at least a size of 1MB.
  94          */
  95         if (kvm_is_error_gpa(vcpu->kvm, address))
  96                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
  97
  98         kvm_s390_set_prefix(vcpu, address);
  99
 100         VCPU_EVENT(vcpu, 5, "setting prefix to %x", address);
 101         trace_kvm_s390_handle_prefix(vcpu, 1, address);
 102         return 0;
 103 }
 104
 105 static int handle_store_prefix(struct kvm_vcpu *vcpu)
 106 {
 107         u64 operand2;
 108         u32 address;
 109         int rc;
 110
 111         vcpu->stat.instruction_stpx++;
 112
 113         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 114                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 115
 116         operand2 = kvm_s390_get_base_disp_s(vcpu);
 117
 118         /* must be word boundary */
 119         if (operand2 & 3)
 120                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 121
 122         address = kvm_s390_get_prefix(vcpu);
 123
 124         /* get the value */
 125         rc = write_guest(vcpu, operand2, &address, sizeof(address));
 126         if (rc)
 127                 return kvm_s390_inject_prog_cond(vcpu, rc);
 128
 129         VCPU_EVENT(vcpu, 5, "storing prefix to %x", address);
 130         trace_kvm_s390_handle_prefix(vcpu, 0, address);
 131         return 0;
 132 }
 133
 134 static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
 135 {
 136         u16 vcpu_id = vcpu->vcpu_id;
 137         u64 ga;
 138         int rc;
 139
 140         vcpu->stat.instruction_stap++;
 141
 142         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 143                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 144
 145         ga = kvm_s390_get_base_disp_s(vcpu);
 146
 147         if (ga & 1)
 148                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 149
 150         rc = write_guest(vcpu, ga, &vcpu_id, sizeof(vcpu_id));
 151         if (rc)
 152                 return kvm_s390_inject_prog_cond(vcpu, rc);
 153
 154         VCPU_EVENT(vcpu, 5, "storing cpu address to %llx", ga);
 155         trace_kvm_s390_handle_stap(vcpu, ga);
 156         return 0;
 157 }
 158
 159 static int __skey_check_enable(struct kvm_vcpu *vcpu)
 160 {
 161         int rc = 0;
 162         if (!(vcpu->arch.sie_block->ictl & (ICTL_ISKE | ICTL_SSKE | ICTL_RRBE)))
 163                 return rc;
 164
 165         rc = s390_enable_skey();
 166         trace_kvm_s390_skey_related_inst(vcpu);
 167         vcpu->arch.sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | ICTL_RRBE);
 168         return rc;
 169 }
 170
 171
 172 static int handle_skey(struct kvm_vcpu *vcpu)
 173 {
 174         int rc = __skey_check_enable(vcpu);
 175
 176         if (rc)
 177                 return rc;
 178         vcpu->stat.instruction_storage_key++;
 179
 180         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 181                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 182
 183         vcpu->arch.sie_block->gpsw.addr =
 184                 __rewind_psw(vcpu->arch.sie_block->gpsw, 4);
 185         VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
 186         return 0;
 187 }
 188
 189 static int handle_ipte_interlock(struct kvm_vcpu *vcpu)
 190 {
 191         psw_t *psw = &vcpu->arch.sie_block->gpsw;
 192
 193         vcpu->stat.instruction_ipte_interlock++;
 194         if (psw_bits(*psw).p)
 195                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 196         wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu));
 197         psw->addr = __rewind_psw(*psw, 4);
 198         VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation");
 199         return 0;
 200 }
 201
 202 static int handle_test_block(struct kvm_vcpu *vcpu)
 203 {
 204         gpa_t addr;
 205         int reg2;
 206
 207         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 208                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 209
 210         kvm_s390_get_regs_rre(vcpu, NULL, &reg2);
 211         addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 212         addr = kvm_s390_logical_to_effective(vcpu, addr);
 213         if (kvm_s390_check_low_addr_protection(vcpu, addr))
 214                 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
 215         addr = kvm_s390_real_to_abs(vcpu, addr);
 216
 217         if (kvm_is_error_gpa(vcpu->kvm, addr))
 218                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 219         /*
 220          * We don't expect errors on modern systems, and do not care
 221          * about storage keys (yet), so let's just clear the page.
 222          */
 223         if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE))
 224                 return -EFAULT;
 225         kvm_s390_set_psw_cc(vcpu, 0);
 226         vcpu->run->s.regs.gprs[0] = 0;
 227         return 0;
 228 }
 229
 230 static int handle_tpi(struct kvm_vcpu *vcpu)
 231 {
 232         struct kvm_s390_interrupt_info *inti;
 233         unsigned long len;
 234         u32 tpi_data[3];
 235         int cc, rc;
 236         u64 addr;
 237
 238         rc = 0;
 239         addr = kvm_s390_get_base_disp_s(vcpu);
 240         if (addr & 3)
 241                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 242         cc = 0;
 243         inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0);
 244         if (!inti)
 245                 goto no_interrupt;
 246         cc = 1;
 247         tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr;
 248         tpi_data[1] = inti->io.io_int_parm;
 249         tpi_data[2] = inti->io.io_int_word;
 250         if (addr) {
 251                 /*
 252                  * Store the two-word I/O interruption code into the
 253                  * provided area.
 254                  */
 255                 len = sizeof(tpi_data) - 4;
 256                 rc = write_guest(vcpu, addr, &tpi_data, len);
 257                 if (rc)
 258                         return kvm_s390_inject_prog_cond(vcpu, rc);
 259         } else {
 260                 /*
 261                  * Store the three-word I/O interruption code into
 262                  * the appropriate lowcore area.
 263                  */
 264                 len = sizeof(tpi_data);
 265                 if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len))
 266                         rc = -EFAULT;
 267         }
 268         /*
 269          * If we encounter a problem storing the interruption code, the
 270          * instruction is suppressed from the guest's view: reinject the
 271          * interrupt.
 272          */
 273         if (!rc)
 274                 kfree(inti);
 275         else
 276                 kvm_s390_reinject_io_int(vcpu->kvm, inti);
 277 no_interrupt:
 278         /* Set condition code and we're done. */
 279         if (!rc)
 280                 kvm_s390_set_psw_cc(vcpu, cc);
 281         return rc ? -EFAULT : 0;
 282 }
 283
 284 static int handle_tsch(struct kvm_vcpu *vcpu)
 285 {
 286         struct kvm_s390_interrupt_info *inti;
 287
 288         inti = kvm_s390_get_io_int(vcpu->kvm, 0,
 289                                    vcpu->run->s.regs.gprs[1]);
 290
 291         /*
 292          * Prepare exit to userspace.
 293          * We indicate whether we dequeued a pending I/O interrupt
 294          * so that userspace can re-inject it if the instruction gets
 295          * a program check. While this may re-order the pending I/O
 296          * interrupts, this is no problem since the priority is kept
 297          * intact.
 298          */
 299         vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
 300         vcpu->run->s390_tsch.dequeued = !!inti;
 301         if (inti) {
 302                 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
 303                 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
 304                 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
 305                 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
 306         }
 307         vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
 308         kfree(inti);
 309         return -EREMOTE;
 310 }
 311
 312 static int handle_io_inst(struct kvm_vcpu *vcpu)
 313 {
 314         VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
 315
 316         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 317                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 318
 319         if (vcpu->kvm->arch.css_support) {
 320                 /*
 321                  * Most I/O instructions will be handled by userspace.
 322                  * Exceptions are tpi and the interrupt portion of tsch.
 323                  */
 324                 if (vcpu->arch.sie_block->ipa == 0xb236)
 325                         return handle_tpi(vcpu);
 326                 if (vcpu->arch.sie_block->ipa == 0xb235)
 327                         return handle_tsch(vcpu);
 328                 /* Handle in userspace. */
 329                 return -EOPNOTSUPP;
 330         } else {
 331                 /*
 332                  * Set condition code 3 to stop the guest from issuing channel
 333                  * I/O instructions.
 334                  */
 335                 kvm_s390_set_psw_cc(vcpu, 3);
 336                 return 0;
 337         }
 338 }
 339
 340 static int handle_stfl(struct kvm_vcpu *vcpu)
 341 {
 342         int rc;
 343
 344         vcpu->stat.instruction_stfl++;
 345
 346         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 347                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 348
 349         rc = write_guest_lc(vcpu, offsetof(struct _lowcore, stfl_fac_list),
 350                             vfacilities, 4);
 351         if (rc)
 352                 return rc;
 353         VCPU_EVENT(vcpu, 5, "store facility list value %x",
 354                    *(unsigned int *) vfacilities);
 355         trace_kvm_s390_handle_stfl(vcpu, *(unsigned int *) vfacilities);
 356         return 0;
 357 }
 358
 359 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
 360 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
 361 #define PSW_ADDR_24 0x0000000000ffffffUL
 362 #define PSW_ADDR_31 0x000000007fffffffUL
 363
 364 int is_valid_psw(psw_t *psw)
 365 {
 366         if (psw->mask & PSW_MASK_UNASSIGNED)
 367                 return 0;
 368         if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
 369                 if (psw->addr & ~PSW_ADDR_31)
 370                         return 0;
 371         }
 372         if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
 373                 return 0;
 374         if ((psw->mask & PSW_MASK_ADDR_MODE) ==  PSW_MASK_EA)
 375                 return 0;
 376         if (psw->addr & 1)
 377                 return 0;
 378         return 1;
 379 }
 380
 381 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
 382 {
 383         psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
 384         psw_compat_t new_psw;
 385         u64 addr;
 386         int rc;
 387
 388         if (gpsw->mask & PSW_MASK_PSTATE)
 389                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 390
 391         addr = kvm_s390_get_base_disp_s(vcpu);
 392         if (addr & 7)
 393                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 394
 395         rc = read_guest(vcpu, addr, &new_psw, sizeof(new_psw));
 396         if (rc)
 397                 return kvm_s390_inject_prog_cond(vcpu, rc);
 398         if (!(new_psw.mask & PSW32_MASK_BASE))
 399                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 400         gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
 401         gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
 402         gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
 403         if (!is_valid_psw(gpsw))
 404                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 405         return 0;
 406 }
 407
 408 static int handle_lpswe(struct kvm_vcpu *vcpu)
 409 {
 410         psw_t new_psw;
 411         u64 addr;
 412         int rc;
 413
 414         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 415                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 416
 417         addr = kvm_s390_get_base_disp_s(vcpu);
 418         if (addr & 7)
 419                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 420         rc = read_guest(vcpu, addr, &new_psw, sizeof(new_psw));
 421         if (rc)
 422                 return kvm_s390_inject_prog_cond(vcpu, rc);
 423         vcpu->arch.sie_block->gpsw = new_psw;
 424         if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
 425                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 426         return 0;
 427 }
 428
 429 static int handle_stidp(struct kvm_vcpu *vcpu)
 430 {
 431         u64 stidp_data = vcpu->arch.stidp_data;
 432         u64 operand2;
 433         int rc;
 434
 435         vcpu->stat.instruction_stidp++;
 436
 437         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 438                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 439
 440         operand2 = kvm_s390_get_base_disp_s(vcpu);
 441
 442         if (operand2 & 7)
 443                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 444
 445         rc = write_guest(vcpu, operand2, &stidp_data, sizeof(stidp_data));
 446         if (rc)
 447                 return kvm_s390_inject_prog_cond(vcpu, rc);
 448
 449         VCPU_EVENT(vcpu, 5, "%s", "store cpu id");
 450         return 0;
 451 }
 452
 453 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
 454 {
 455         int cpus = 0;
 456         int n;
 457
 458         cpus = atomic_read(&vcpu->kvm->online_vcpus);
 459
 460         /* deal with other level 3 hypervisors */
 461         if (stsi(mem, 3, 2, 2))
 462                 mem->count = 0;
 463         if (mem->count < 8)
 464                 mem->count++;
 465         for (n = mem->count - 1; n > 0 ; n--)
 466                 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
 467
 468         mem->vm[0].cpus_total = cpus;
 469         mem->vm[0].cpus_configured = cpus;
 470         mem->vm[0].cpus_standby = 0;
 471         mem->vm[0].cpus_reserved = 0;
 472         mem->vm[0].caf = 1000;
 473         memcpy(mem->vm[0].name, "KVMguest", 8);
 474         ASCEBC(mem->vm[0].name, 8);
 475         memcpy(mem->vm[0].cpi, "KVM/Linux       ", 16);
 476         ASCEBC(mem->vm[0].cpi, 16);
 477 }
 478
 479 static int handle_stsi(struct kvm_vcpu *vcpu)
 480 {
 481         int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
 482         int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
 483         int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
 484         unsigned long mem = 0;
 485         u64 operand2;
 486         int rc = 0;
 487
 488         vcpu->stat.instruction_stsi++;
 489         VCPU_EVENT(vcpu, 4, "stsi: fc: %x sel1: %x sel2: %x", fc, sel1, sel2);
 490
 491         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 492                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 493
 494         if (fc > 3) {
 495                 kvm_s390_set_psw_cc(vcpu, 3);
 496                 return 0;
 497         }
 498
 499         if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
 500             || vcpu->run->s.regs.gprs[1] & 0xffff0000)
 501                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 502
 503         if (fc == 0) {
 504                 vcpu->run->s.regs.gprs[0] = 3 << 28;
 505                 kvm_s390_set_psw_cc(vcpu, 0);
 506                 return 0;
 507         }
 508
 509         operand2 = kvm_s390_get_base_disp_s(vcpu);
 510
 511         if (operand2 & 0xfff)
 512                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 513
 514         switch (fc) {
 515         case 1: /* same handling for 1 and 2 */
 516         case 2:
 517                 mem = get_zeroed_page(GFP_KERNEL);
 518                 if (!mem)
 519                         goto out_no_data;
 520                 if (stsi((void *) mem, fc, sel1, sel2))
 521                         goto out_no_data;
 522                 break;
 523         case 3:
 524                 if (sel1 != 2 || sel2 != 2)
 525                         goto out_no_data;
 526                 mem = get_zeroed_page(GFP_KERNEL);
 527                 if (!mem)
 528                         goto out_no_data;
 529                 handle_stsi_3_2_2(vcpu, (void *) mem);
 530                 break;
 531         }
 532
 533         rc = write_guest(vcpu, operand2, (void *)mem, PAGE_SIZE);
 534         if (rc) {
 535                 rc = kvm_s390_inject_prog_cond(vcpu, rc);
 536                 goto out;
 537         }
 538         trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
 539         free_page(mem);
 540         kvm_s390_set_psw_cc(vcpu, 0);
 541         vcpu->run->s.regs.gprs[0] = 0;
 542         return 0;
 543 out_no_data:
 544         kvm_s390_set_psw_cc(vcpu, 3);
 545 out:
 546         free_page(mem);
 547         return rc;
 548 }
 549
 550 static const intercept_handler_t b2_handlers[256] = {
 551         [0x02] = handle_stidp,
 552         [0x04] = handle_set_clock,
 553         [0x10] = handle_set_prefix,
 554         [0x11] = handle_store_prefix,
 555         [0x12] = handle_store_cpu_address,
 556         [0x21] = handle_ipte_interlock,
 557         [0x29] = handle_skey,
 558         [0x2a] = handle_skey,
 559         [0x2b] = handle_skey,
 560         [0x2c] = handle_test_block,
 561         [0x30] = handle_io_inst,
 562         [0x31] = handle_io_inst,
 563         [0x32] = handle_io_inst,
 564         [0x33] = handle_io_inst,
 565         [0x34] = handle_io_inst,
 566         [0x35] = handle_io_inst,
 567         [0x36] = handle_io_inst,
 568         [0x37] = handle_io_inst,
 569         [0x38] = handle_io_inst,
 570         [0x39] = handle_io_inst,
 571         [0x3a] = handle_io_inst,
 572         [0x3b] = handle_io_inst,
 573         [0x3c] = handle_io_inst,
 574         [0x50] = handle_ipte_interlock,
 575         [0x5f] = handle_io_inst,
 576         [0x74] = handle_io_inst,
 577         [0x76] = handle_io_inst,
 578         [0x7d] = handle_stsi,
 579         [0xb1] = handle_stfl,
 580         [0xb2] = handle_lpswe,
 581 };
 582
 583 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
 584 {
 585         intercept_handler_t handler;
 586
 587         /*
 588          * A lot of B2 instructions are priviledged. Here we check for
 589          * the privileged ones, that we can handle in the kernel.
 590          * Anything else goes to userspace.
 591          */
 592         handler = b2_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
 593         if (handler)
 594                 return handler(vcpu);
 595
 596         return -EOPNOTSUPP;
 597 }
 598
 599 static int handle_epsw(struct kvm_vcpu *vcpu)
 600 {
 601         int reg1, reg2;
 602
 603         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 604
 605         /* This basically extracts the mask half of the psw. */
 606         vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
 607         vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
 608         if (reg2) {
 609                 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
 610                 vcpu->run->s.regs.gprs[reg2] |=
 611                         vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
 612         }
 613         return 0;
 614 }
 615
 616 #define PFMF_RESERVED   0xfffc0101UL
 617 #define PFMF_SK         0x00020000UL
 618 #define PFMF_CF         0x00010000UL
 619 #define PFMF_UI         0x00008000UL
 620 #define PFMF_FSC        0x00007000UL
 621 #define PFMF_NQ         0x00000800UL
 622 #define PFMF_MR         0x00000400UL
 623 #define PFMF_MC         0x00000200UL
 624 #define PFMF_KEY        0x000000feUL
 625
 626 static int handle_pfmf(struct kvm_vcpu *vcpu)
 627 {
 628         int reg1, reg2;
 629         unsigned long start, end;
 630
 631         vcpu->stat.instruction_pfmf++;
 632
 633         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 634
 635         if (!MACHINE_HAS_PFMF)
 636                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
 637
 638         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 639                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 640
 641         if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
 642                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 643
 644         /* Only provide non-quiescing support if the host supports it */
 645         if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ && !test_facility(14))
 646                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 647
 648         /* No support for conditional-SSKE */
 649         if (vcpu->run->s.regs.gprs[reg1] & (PFMF_MR | PFMF_MC))
 650                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 651
 652         start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 653         if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
 654                 if (kvm_s390_check_low_addr_protection(vcpu, start))
 655                         return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
 656         }
 657
 658         switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
 659         case 0x00000000:
 660                 end = (start + (1UL << 12)) & ~((1UL << 12) - 1);
 661                 break;
 662         case 0x00001000:
 663                 end = (start + (1UL << 20)) & ~((1UL << 20) - 1);
 664                 break;
 665         /* We dont support EDAT2
 666         case 0x00002000:
 667                 end = (start + (1UL << 31)) & ~((1UL << 31) - 1);
 668                 break;*/
 669         default:
 670                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 671         }
 672         while (start < end) {
 673                 unsigned long useraddr, abs_addr;
 674
 675                 /* Translate guest address to host address */
 676                 if ((vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) == 0)
 677                         abs_addr = kvm_s390_real_to_abs(vcpu, start);
 678                 else
 679                         abs_addr = start;
 680                 useraddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(abs_addr));
 681                 if (kvm_is_error_hva(useraddr))
 682                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 683
 684                 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
 685                         if (clear_user((void __user *)useraddr, PAGE_SIZE))
 686                                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 687                 }
 688
 689                 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
 690                         int rc = __skey_check_enable(vcpu);
 691
 692                         if (rc)
 693                                 return rc;
 694                         if (set_guest_storage_key(current->mm, useraddr,
 695                                         vcpu->run->s.regs.gprs[reg1] & PFMF_KEY,
 696                                         vcpu->run->s.regs.gprs[reg1] & PFMF_NQ))
 697                                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 698                 }
 699
 700                 start += PAGE_SIZE;
 701         }
 702         if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC)
 703                 vcpu->run->s.regs.gprs[reg2] = end;
 704         return 0;
 705 }
 706
 707 static int handle_essa(struct kvm_vcpu *vcpu)
 708 {
 709         /* entries expected to be 1FF */
 710         int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
 711         unsigned long *cbrlo, cbrle;
 712         struct gmap *gmap;
 713         int i;
 714
 715         VCPU_EVENT(vcpu, 5, "cmma release %d pages", entries);
 716         gmap = vcpu->arch.gmap;
 717         vcpu->stat.instruction_essa++;
 718         if (!kvm_s390_cmma_enabled(vcpu->kvm))
 719                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
 720
 721         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 722                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 723
 724         if (((vcpu->arch.sie_block->ipb & 0xf0000000) >> 28) > 6)
 725                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 726
 727         /* Rewind PSW to repeat the ESSA instruction */
 728         vcpu->arch.sie_block->gpsw.addr =
 729                 __rewind_psw(vcpu->arch.sie_block->gpsw, 4);
 730         vcpu->arch.sie_block->cbrlo &= PAGE_MASK;       /* reset nceo */
 731         cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
 732         down_read(&gmap->mm->mmap_sem);
 733         for (i = 0; i < entries; ++i) {
 734                 cbrle = cbrlo[i];
 735                 if (unlikely(cbrle & ~PAGE_MASK || cbrle < 2 * PAGE_SIZE))
 736                         /* invalid entry */
 737                         break;
 738                 /* try to free backing */
 739                 __gmap_zap(gmap, cbrle);
 740         }
 741         up_read(&gmap->mm->mmap_sem);
 742         if (i < entries)
 743                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 744         return 0;
 745 }
 746
 747 static const intercept_handler_t b9_handlers[256] = {
 748         [0x8a] = handle_ipte_interlock,
 749         [0x8d] = handle_epsw,
 750         [0x8e] = handle_ipte_interlock,
 751         [0x8f] = handle_ipte_interlock,
 752         [0xab] = handle_essa,
 753         [0xaf] = handle_pfmf,
 754 };
 755
 756 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
 757 {
 758         intercept_handler_t handler;
 759
 760         /* This is handled just as for the B2 instructions. */
 761         handler = b9_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
 762         if (handler)
 763                 return handler(vcpu);
 764
 765         return -EOPNOTSUPP;
 766 }
 767
 768 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
 769 {
 770         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
 771         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
 772         u32 val = 0;
 773         int reg, rc;
 774         u64 ga;
 775
 776         vcpu->stat.instruction_lctl++;
 777
 778         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 779                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 780
 781         ga = kvm_s390_get_base_disp_rs(vcpu);
 782
 783         if (ga & 3)
 784                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 785
 786         VCPU_EVENT(vcpu, 5, "lctl r1:%x, r3:%x, addr:%llx", reg1, reg3, ga);
 787         trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga);
 788
 789         reg = reg1;
 790         do {
 791                 rc = read_guest(vcpu, ga, &val, sizeof(val));
 792                 if (rc)
 793                         return kvm_s390_inject_prog_cond(vcpu, rc);
 794                 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
 795                 vcpu->arch.sie_block->gcr[reg] |= val;
 796                 ga += 4;
 797                 if (reg == reg3)
 798                         break;
 799                 reg = (reg + 1) % 16;
 800         } while (1);
 801
 802         return 0;
 803 }
 804
 805 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu)
 806 {
 807         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
 808         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
 809         u64 ga;
 810         u32 val;
 811         int reg, rc;
 812
 813         vcpu->stat.instruction_stctl++;
 814
 815         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 816                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 817
 818         ga = kvm_s390_get_base_disp_rs(vcpu);
 819
 820         if (ga & 3)
 821                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 822
 823         VCPU_EVENT(vcpu, 5, "stctl r1:%x, r3:%x, addr:%llx", reg1, reg3, ga);
 824         trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga);
 825
 826         reg = reg1;
 827         do {
 828                 val = vcpu->arch.sie_block->gcr[reg] &  0x00000000fffffffful;
 829                 rc = write_guest(vcpu, ga, &val, sizeof(val));
 830                 if (rc)
 831                         return kvm_s390_inject_prog_cond(vcpu, rc);
 832                 ga += 4;
 833                 if (reg == reg3)
 834                         break;
 835                 reg = (reg + 1) % 16;
 836         } while (1);
 837
 838         return 0;
 839 }
 840
 841 static int handle_lctlg(struct kvm_vcpu *vcpu)
 842 {
 843         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
 844         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
 845         u64 ga, val;
 846         int reg, rc;
 847
 848         vcpu->stat.instruction_lctlg++;
 849
 850         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 851                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 852
 853         ga = kvm_s390_get_base_disp_rsy(vcpu);
 854
 855         if (ga & 7)
 856                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 857
 858         reg = reg1;
 859
 860         VCPU_EVENT(vcpu, 5, "lctlg r1:%x, r3:%x, addr:%llx", reg1, reg3, ga);
 861         trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga);
 862
 863         do {
 864                 rc = read_guest(vcpu, ga, &val, sizeof(val));
 865                 if (rc)
 866                         return kvm_s390_inject_prog_cond(vcpu, rc);
 867                 vcpu->arch.sie_block->gcr[reg] = val;
 868                 ga += 8;
 869                 if (reg == reg3)
 870                         break;
 871                 reg = (reg + 1) % 16;
 872         } while (1);
 873
 874         return 0;
 875 }
 876
 877 static int handle_stctg(struct kvm_vcpu *vcpu)
 878 {
 879         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
 880         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
 881         u64 ga, val;
 882         int reg, rc;
 883
 884         vcpu->stat.instruction_stctg++;
 885
 886         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 887                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 888
 889         ga = kvm_s390_get_base_disp_rsy(vcpu);
 890
 891         if (ga & 7)
 892                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 893
 894         reg = reg1;
 895
 896         VCPU_EVENT(vcpu, 5, "stctg r1:%x, r3:%x, addr:%llx", reg1, reg3, ga);
 897         trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga);
 898
 899         do {
 900                 val = vcpu->arch.sie_block->gcr[reg];
 901                 rc = write_guest(vcpu, ga, &val, sizeof(val));
 902                 if (rc)
 903                         return kvm_s390_inject_prog_cond(vcpu, rc);
 904                 ga += 8;
 905                 if (reg == reg3)
 906                         break;
 907                 reg = (reg + 1) % 16;
 908         } while (1);
 909
 910         return 0;
 911 }
 912
 913 static const intercept_handler_t eb_handlers[256] = {
 914         [0x2f] = handle_lctlg,
 915         [0x25] = handle_stctg,
 916 };
 917
 918 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
 919 {
 920         intercept_handler_t handler;
 921
 922         handler = eb_handlers[vcpu->arch.sie_block->ipb & 0xff];
 923         if (handler)
 924                 return handler(vcpu);
 925         return -EOPNOTSUPP;
 926 }
 927
 928 static int handle_tprot(struct kvm_vcpu *vcpu)
 929 {
 930         u64 address1, address2;
 931         unsigned long hva, gpa;
 932         int ret = 0, cc = 0;
 933         bool writable;
 934
 935         vcpu->stat.instruction_tprot++;
 936
 937         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 938                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 939
 940         kvm_s390_get_base_disp_sse(vcpu, &address1, &address2);
 941
 942         /* we only handle the Linux memory detection case:
 943          * access key == 0
 944          * everything else goes to userspace. */
 945         if (address2 & 0xf0)
 946                 return -EOPNOTSUPP;
 947         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
 948                 ipte_lock(vcpu);
 949         ret = guest_translate_address(vcpu, address1, &gpa, 1);
 950         if (ret == PGM_PROTECTION) {
 951                 /* Write protected? Try again with read-only... */
 952                 cc = 1;
 953                 ret = guest_translate_address(vcpu, address1, &gpa, 0);
 954         }
 955         if (ret) {
 956                 if (ret == PGM_ADDRESSING || ret == PGM_TRANSLATION_SPEC) {
 957                         ret = kvm_s390_inject_program_int(vcpu, ret);
 958                 } else if (ret > 0) {
 959                         /* Translation not available */
 960                         kvm_s390_set_psw_cc(vcpu, 3);
 961                         ret = 0;
 962                 }
 963                 goto out_unlock;
 964         }
 965
 966         hva = gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable);
 967         if (kvm_is_error_hva(hva)) {
 968                 ret = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 969         } else {
 970                 if (!writable)
 971                         cc = 1;         /* Write not permitted ==> read-only */
 972                 kvm_s390_set_psw_cc(vcpu, cc);
 973                 /* Note: CC2 only occurs for storage keys (not supported yet) */
 974         }
 975 out_unlock:
 976         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
 977                 ipte_unlock(vcpu);
 978         return ret;
 979 }
 980
 981 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
 982 {
 983         /* For e5xx... instructions we only handle TPROT */
 984         if ((vcpu->arch.sie_block->ipa & 0x00ff) == 0x01)
 985                 return handle_tprot(vcpu);
 986         return -EOPNOTSUPP;
 987 }
 988
 989 static int handle_sckpf(struct kvm_vcpu *vcpu)
 990 {
 991         u32 value;
 992
 993         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 994                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 995
 996         if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
 997                 return kvm_s390_inject_program_int(vcpu,
 998                                                    PGM_SPECIFICATION);
 999
1000         value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
1001         vcpu->arch.sie_block->todpr = value;
1002
1003         return 0;
1004 }
1005
1006 static const intercept_handler_t x01_handlers[256] = {
1007         [0x07] = handle_sckpf,
1008 };
1009
1010 int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
1011 {
1012         intercept_handler_t handler;
1013
1014         handler = x01_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
1015         if (handler)
1016                 return handler(vcpu);
1017         return -EOPNOTSUPP;
1018 }