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