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/gmap.h>
  27 #include <asm/io.h>
  28 #include <asm/ptrace.h>
  29 #include <asm/compat.h>
  30 #include <asm/sclp.h>
  31 #include "gaccess.h"
  32 #include "kvm-s390.h"
  33 #include "trace.h"
  34
  35 static int handle_ri(struct kvm_vcpu *vcpu)
  36 {
  37         if (test_kvm_facility(vcpu->kvm, 64)) {
  38                 vcpu->arch.sie_block->ecb3 |= 0x01;
  39                 kvm_s390_retry_instr(vcpu);
  40                 return 0;
  41         } else
  42                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
  43 }
  44
  45 int kvm_s390_handle_aa(struct kvm_vcpu *vcpu)
  46 {
  47         if ((vcpu->arch.sie_block->ipa & 0xf) <= 4)
  48                 return handle_ri(vcpu);
  49         else
  50                 return -EOPNOTSUPP;
  51 }
  52
  53 /* Handle SCK (SET CLOCK) interception */
  54 static int handle_set_clock(struct kvm_vcpu *vcpu)
  55 {
  56         int rc;
  57         u8 ar;
  58         u64 op2, val;
  59
  60         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
  61                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
  62
  63         op2 = kvm_s390_get_base_disp_s(vcpu, &ar);
  64         if (op2 & 7)    /* Operand must be on a doubleword boundary */
  65                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
  66         rc = read_guest(vcpu, op2, ar, &val, sizeof(val));
  67         if (rc)
  68                 return kvm_s390_inject_prog_cond(vcpu, rc);
  69
  70         VCPU_EVENT(vcpu, 3, "SCK: setting guest TOD to 0x%llx", val);
  71         kvm_s390_set_tod_clock(vcpu->kvm, val);
  72
  73         kvm_s390_set_psw_cc(vcpu, 0);
  74         return 0;
  75 }
  76
  77 static int handle_set_prefix(struct kvm_vcpu *vcpu)
  78 {
  79         u64 operand2;
  80         u32 address;
  81         int rc;
  82         u8 ar;
  83
  84         vcpu->stat.instruction_spx++;
  85
  86         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
  87                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
  88
  89         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
  90
  91         /* must be word boundary */
  92         if (operand2 & 3)
  93                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
  94
  95         /* get the value */
  96         rc = read_guest(vcpu, operand2, ar, &address, sizeof(address));
  97         if (rc)
  98                 return kvm_s390_inject_prog_cond(vcpu, rc);
  99
 100         address &= 0x7fffe000u;
 101
 102         /*
 103          * Make sure the new value is valid memory. We only need to check the
 104          * first page, since address is 8k aligned and memory pieces are always
 105          * at least 1MB aligned and have at least a size of 1MB.
 106          */
 107         if (kvm_is_error_gpa(vcpu->kvm, address))
 108                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 109
 110         kvm_s390_set_prefix(vcpu, address);
 111         trace_kvm_s390_handle_prefix(vcpu, 1, address);
 112         return 0;
 113 }
 114
 115 static int handle_store_prefix(struct kvm_vcpu *vcpu)
 116 {
 117         u64 operand2;
 118         u32 address;
 119         int rc;
 120         u8 ar;
 121
 122         vcpu->stat.instruction_stpx++;
 123
 124         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 125                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 126
 127         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 128
 129         /* must be word boundary */
 130         if (operand2 & 3)
 131                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 132
 133         address = kvm_s390_get_prefix(vcpu);
 134
 135         /* get the value */
 136         rc = write_guest(vcpu, operand2, ar, &address, sizeof(address));
 137         if (rc)
 138                 return kvm_s390_inject_prog_cond(vcpu, rc);
 139
 140         VCPU_EVENT(vcpu, 3, "STPX: storing prefix 0x%x into 0x%llx", address, operand2);
 141         trace_kvm_s390_handle_prefix(vcpu, 0, address);
 142         return 0;
 143 }
 144
 145 static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
 146 {
 147         u16 vcpu_id = vcpu->vcpu_id;
 148         u64 ga;
 149         int rc;
 150         u8 ar;
 151
 152         vcpu->stat.instruction_stap++;
 153
 154         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 155                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 156
 157         ga = kvm_s390_get_base_disp_s(vcpu, &ar);
 158
 159         if (ga & 1)
 160                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 161
 162         rc = write_guest(vcpu, ga, ar, &vcpu_id, sizeof(vcpu_id));
 163         if (rc)
 164                 return kvm_s390_inject_prog_cond(vcpu, rc);
 165
 166         VCPU_EVENT(vcpu, 3, "STAP: storing cpu address (%u) to 0x%llx", vcpu_id, ga);
 167         trace_kvm_s390_handle_stap(vcpu, ga);
 168         return 0;
 169 }
 170
 171 static int __skey_check_enable(struct kvm_vcpu *vcpu)
 172 {
 173         int rc = 0;
 174
 175         trace_kvm_s390_skey_related_inst(vcpu);
 176         if (!(vcpu->arch.sie_block->ictl & (ICTL_ISKE | ICTL_SSKE | ICTL_RRBE)))
 177                 return rc;
 178
 179         rc = s390_enable_skey();
 180         VCPU_EVENT(vcpu, 3, "enabling storage keys for guest: %d", rc);
 181         if (!rc)
 182                 vcpu->arch.sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | ICTL_RRBE);
 183         return rc;
 184 }
 185
 186 static int try_handle_skey(struct kvm_vcpu *vcpu)
 187 {
 188         int rc;
 189
 190         vcpu->stat.instruction_storage_key++;
 191         rc = __skey_check_enable(vcpu);
 192         if (rc)
 193                 return rc;
 194         if (sclp.has_skey) {
 195                 /* with storage-key facility, SIE interprets it for us */
 196                 kvm_s390_retry_instr(vcpu);
 197                 VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
 198                 return -EAGAIN;
 199         }
 200         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 201                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 202         return 0;
 203 }
 204
 205 static int handle_iske(struct kvm_vcpu *vcpu)
 206 {
 207         unsigned long addr;
 208         unsigned char key;
 209         int reg1, reg2;
 210         int rc;
 211
 212         rc = try_handle_skey(vcpu);
 213         if (rc)
 214                 return rc != -EAGAIN ? rc : 0;
 215
 216         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 217
 218         addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 219         addr = kvm_s390_logical_to_effective(vcpu, addr);
 220         addr = kvm_s390_real_to_abs(vcpu, addr);
 221         addr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(addr));
 222         if (kvm_is_error_hva(addr))
 223                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 224
 225         down_read(&current->mm->mmap_sem);
 226         rc = get_guest_storage_key(current->mm, addr, &key);
 227         up_read(&current->mm->mmap_sem);
 228         if (rc)
 229                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 230         vcpu->run->s.regs.gprs[reg1] &= ~0xff;
 231         vcpu->run->s.regs.gprs[reg1] |= key;
 232         return 0;
 233 }
 234
 235 static int handle_rrbe(struct kvm_vcpu *vcpu)
 236 {
 237         unsigned long addr;
 238         int reg1, reg2;
 239         int rc;
 240
 241         rc = try_handle_skey(vcpu);
 242         if (rc)
 243                 return rc != -EAGAIN ? rc : 0;
 244
 245         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 246
 247         addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 248         addr = kvm_s390_logical_to_effective(vcpu, addr);
 249         addr = kvm_s390_real_to_abs(vcpu, addr);
 250         addr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(addr));
 251         if (kvm_is_error_hva(addr))
 252                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 253
 254         down_read(&current->mm->mmap_sem);
 255         rc = reset_guest_reference_bit(current->mm, addr);
 256         up_read(&current->mm->mmap_sem);
 257         if (rc < 0)
 258                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 259
 260         kvm_s390_set_psw_cc(vcpu, rc);
 261         return 0;
 262 }
 263
 264 #define SSKE_NQ 0x8
 265 #define SSKE_MR 0x4
 266 #define SSKE_MC 0x2
 267 #define SSKE_MB 0x1
 268 static int handle_sske(struct kvm_vcpu *vcpu)
 269 {
 270         unsigned char m3 = vcpu->arch.sie_block->ipb >> 28;
 271         unsigned long start, end;
 272         unsigned char key, oldkey;
 273         int reg1, reg2;
 274         int rc;
 275
 276         rc = try_handle_skey(vcpu);
 277         if (rc)
 278                 return rc != -EAGAIN ? rc : 0;
 279
 280         if (!test_kvm_facility(vcpu->kvm, 8))
 281                 m3 &= ~SSKE_MB;
 282         if (!test_kvm_facility(vcpu->kvm, 10))
 283                 m3 &= ~(SSKE_MC | SSKE_MR);
 284         if (!test_kvm_facility(vcpu->kvm, 14))
 285                 m3 &= ~SSKE_NQ;
 286
 287         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 288
 289         key = vcpu->run->s.regs.gprs[reg1] & 0xfe;
 290         start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 291         start = kvm_s390_logical_to_effective(vcpu, start);
 292         if (m3 & SSKE_MB) {
 293                 /* start already designates an absolute address */
 294                 end = (start + (1UL << 20)) & ~((1UL << 20) - 1);
 295         } else {
 296                 start = kvm_s390_real_to_abs(vcpu, start);
 297                 end = start + PAGE_SIZE;
 298         }
 299
 300         while (start != end) {
 301                 unsigned long addr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
 302
 303                 if (kvm_is_error_hva(addr))
 304                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 305
 306                 down_read(&current->mm->mmap_sem);
 307                 rc = cond_set_guest_storage_key(current->mm, addr, key, &oldkey,
 308                                                 m3 & SSKE_NQ, m3 & SSKE_MR,
 309                                                 m3 & SSKE_MC);
 310                 up_read(&current->mm->mmap_sem);
 311                 if (rc < 0)
 312                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 313                 start += PAGE_SIZE;
 314         }
 315
 316         if (m3 & (SSKE_MC | SSKE_MR)) {
 317                 if (m3 & SSKE_MB) {
 318                         /* skey in reg1 is unpredictable */
 319                         kvm_s390_set_psw_cc(vcpu, 3);
 320                 } else {
 321                         kvm_s390_set_psw_cc(vcpu, rc);
 322                         vcpu->run->s.regs.gprs[reg1] &= ~0xff00UL;
 323                         vcpu->run->s.regs.gprs[reg1] |= (u64) oldkey << 8;
 324                 }
 325         }
 326         if (m3 & SSKE_MB) {
 327                 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_AMODE_64BIT)
 328                         vcpu->run->s.regs.gprs[reg2] &= ~PAGE_MASK;
 329                 else
 330                         vcpu->run->s.regs.gprs[reg2] &= ~0xfffff000UL;
 331                 end = kvm_s390_logical_to_effective(vcpu, end);
 332                 vcpu->run->s.regs.gprs[reg2] |= end;
 333         }
 334         return 0;
 335 }
 336
 337 static int handle_ipte_interlock(struct kvm_vcpu *vcpu)
 338 {
 339         vcpu->stat.instruction_ipte_interlock++;
 340         if (psw_bits(vcpu->arch.sie_block->gpsw).p)
 341                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 342         wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu));
 343         kvm_s390_retry_instr(vcpu);
 344         VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation");
 345         return 0;
 346 }
 347
 348 static int handle_test_block(struct kvm_vcpu *vcpu)
 349 {
 350         gpa_t addr;
 351         int reg2;
 352
 353         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 354                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 355
 356         kvm_s390_get_regs_rre(vcpu, NULL, &reg2);
 357         addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 358         addr = kvm_s390_logical_to_effective(vcpu, addr);
 359         if (kvm_s390_check_low_addr_prot_real(vcpu, addr))
 360                 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
 361         addr = kvm_s390_real_to_abs(vcpu, addr);
 362
 363         if (kvm_is_error_gpa(vcpu->kvm, addr))
 364                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 365         /*
 366          * We don't expect errors on modern systems, and do not care
 367          * about storage keys (yet), so let's just clear the page.
 368          */
 369         if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE))
 370                 return -EFAULT;
 371         kvm_s390_set_psw_cc(vcpu, 0);
 372         vcpu->run->s.regs.gprs[0] = 0;
 373         return 0;
 374 }
 375
 376 static int handle_tpi(struct kvm_vcpu *vcpu)
 377 {
 378         struct kvm_s390_interrupt_info *inti;
 379         unsigned long len;
 380         u32 tpi_data[3];
 381         int rc;
 382         u64 addr;
 383         u8 ar;
 384
 385         addr = kvm_s390_get_base_disp_s(vcpu, &ar);
 386         if (addr & 3)
 387                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 388
 389         inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0);
 390         if (!inti) {
 391                 kvm_s390_set_psw_cc(vcpu, 0);
 392                 return 0;
 393         }
 394
 395         tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr;
 396         tpi_data[1] = inti->io.io_int_parm;
 397         tpi_data[2] = inti->io.io_int_word;
 398         if (addr) {
 399                 /*
 400                  * Store the two-word I/O interruption code into the
 401                  * provided area.
 402                  */
 403                 len = sizeof(tpi_data) - 4;
 404                 rc = write_guest(vcpu, addr, ar, &tpi_data, len);
 405                 if (rc) {
 406                         rc = kvm_s390_inject_prog_cond(vcpu, rc);
 407                         goto reinject_interrupt;
 408                 }
 409         } else {
 410                 /*
 411                  * Store the three-word I/O interruption code into
 412                  * the appropriate lowcore area.
 413                  */
 414                 len = sizeof(tpi_data);
 415                 if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) {
 416                         /* failed writes to the low core are not recoverable */
 417                         rc = -EFAULT;
 418                         goto reinject_interrupt;
 419                 }
 420         }
 421
 422         /* irq was successfully handed to the guest */
 423         kfree(inti);
 424         kvm_s390_set_psw_cc(vcpu, 1);
 425         return 0;
 426 reinject_interrupt:
 427         /*
 428          * If we encounter a problem storing the interruption code, the
 429          * instruction is suppressed from the guest's view: reinject the
 430          * interrupt.
 431          */
 432         if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) {
 433                 kfree(inti);
 434                 rc = -EFAULT;
 435         }
 436         /* don't set the cc, a pgm irq was injected or we drop to user space */
 437         return rc ? -EFAULT : 0;
 438 }
 439
 440 static int handle_tsch(struct kvm_vcpu *vcpu)
 441 {
 442         struct kvm_s390_interrupt_info *inti = NULL;
 443         const u64 isc_mask = 0xffUL << 24; /* all iscs set */
 444
 445         /* a valid schid has at least one bit set */
 446         if (vcpu->run->s.regs.gprs[1])
 447                 inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask,
 448                                            vcpu->run->s.regs.gprs[1]);
 449
 450         /*
 451          * Prepare exit to userspace.
 452          * We indicate whether we dequeued a pending I/O interrupt
 453          * so that userspace can re-inject it if the instruction gets
 454          * a program check. While this may re-order the pending I/O
 455          * interrupts, this is no problem since the priority is kept
 456          * intact.
 457          */
 458         vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
 459         vcpu->run->s390_tsch.dequeued = !!inti;
 460         if (inti) {
 461                 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
 462                 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
 463                 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
 464                 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
 465         }
 466         vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
 467         kfree(inti);
 468         return -EREMOTE;
 469 }
 470
 471 static int handle_io_inst(struct kvm_vcpu *vcpu)
 472 {
 473         VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
 474
 475         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 476                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 477
 478         if (vcpu->kvm->arch.css_support) {
 479                 /*
 480                  * Most I/O instructions will be handled by userspace.
 481                  * Exceptions are tpi and the interrupt portion of tsch.
 482                  */
 483                 if (vcpu->arch.sie_block->ipa == 0xb236)
 484                         return handle_tpi(vcpu);
 485                 if (vcpu->arch.sie_block->ipa == 0xb235)
 486                         return handle_tsch(vcpu);
 487                 /* Handle in userspace. */
 488                 return -EOPNOTSUPP;
 489         } else {
 490                 /*
 491                  * Set condition code 3 to stop the guest from issuing channel
 492                  * I/O instructions.
 493                  */
 494                 kvm_s390_set_psw_cc(vcpu, 3);
 495                 return 0;
 496         }
 497 }
 498
 499 static int handle_stfl(struct kvm_vcpu *vcpu)
 500 {
 501         int rc;
 502         unsigned int fac;
 503
 504         vcpu->stat.instruction_stfl++;
 505
 506         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 507                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 508
 509         /*
 510          * We need to shift the lower 32 facility bits (bit 0-31) from a u64
 511          * into a u32 memory representation. They will remain bits 0-31.
 512          */
 513         fac = *vcpu->kvm->arch.model.fac_list >> 32;
 514         rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list),
 515                             &fac, sizeof(fac));
 516         if (rc)
 517                 return rc;
 518         VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac);
 519         trace_kvm_s390_handle_stfl(vcpu, fac);
 520         return 0;
 521 }
 522
 523 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
 524 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
 525 #define PSW_ADDR_24 0x0000000000ffffffUL
 526 #define PSW_ADDR_31 0x000000007fffffffUL
 527
 528 int is_valid_psw(psw_t *psw)
 529 {
 530         if (psw->mask & PSW_MASK_UNASSIGNED)
 531                 return 0;
 532         if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
 533                 if (psw->addr & ~PSW_ADDR_31)
 534                         return 0;
 535         }
 536         if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
 537                 return 0;
 538         if ((psw->mask & PSW_MASK_ADDR_MODE) ==  PSW_MASK_EA)
 539                 return 0;
 540         if (psw->addr & 1)
 541                 return 0;
 542         return 1;
 543 }
 544
 545 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
 546 {
 547         psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
 548         psw_compat_t new_psw;
 549         u64 addr;
 550         int rc;
 551         u8 ar;
 552
 553         if (gpsw->mask & PSW_MASK_PSTATE)
 554                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 555
 556         addr = kvm_s390_get_base_disp_s(vcpu, &ar);
 557         if (addr & 7)
 558                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 559
 560         rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
 561         if (rc)
 562                 return kvm_s390_inject_prog_cond(vcpu, rc);
 563         if (!(new_psw.mask & PSW32_MASK_BASE))
 564                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 565         gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
 566         gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
 567         gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
 568         if (!is_valid_psw(gpsw))
 569                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 570         return 0;
 571 }
 572
 573 static int handle_lpswe(struct kvm_vcpu *vcpu)
 574 {
 575         psw_t new_psw;
 576         u64 addr;
 577         int rc;
 578         u8 ar;
 579
 580         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 581                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 582
 583         addr = kvm_s390_get_base_disp_s(vcpu, &ar);
 584         if (addr & 7)
 585                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 586         rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
 587         if (rc)
 588                 return kvm_s390_inject_prog_cond(vcpu, rc);
 589         vcpu->arch.sie_block->gpsw = new_psw;
 590         if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
 591                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 592         return 0;
 593 }
 594
 595 static int handle_stidp(struct kvm_vcpu *vcpu)
 596 {
 597         u64 stidp_data = vcpu->kvm->arch.model.cpuid;
 598         u64 operand2;
 599         int rc;
 600         u8 ar;
 601
 602         vcpu->stat.instruction_stidp++;
 603
 604         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 605                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 606
 607         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 608
 609         if (operand2 & 7)
 610                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 611
 612         rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data));
 613         if (rc)
 614                 return kvm_s390_inject_prog_cond(vcpu, rc);
 615
 616         VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data);
 617         return 0;
 618 }
 619
 620 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
 621 {
 622         int cpus = 0;
 623         int n;
 624
 625         cpus = atomic_read(&vcpu->kvm->online_vcpus);
 626
 627         /* deal with other level 3 hypervisors */
 628         if (stsi(mem, 3, 2, 2))
 629                 mem->count = 0;
 630         if (mem->count < 8)
 631                 mem->count++;
 632         for (n = mem->count - 1; n > 0 ; n--)
 633                 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
 634
 635         memset(&mem->vm[0], 0, sizeof(mem->vm[0]));
 636         mem->vm[0].cpus_total = cpus;
 637         mem->vm[0].cpus_configured = cpus;
 638         mem->vm[0].cpus_standby = 0;
 639         mem->vm[0].cpus_reserved = 0;
 640         mem->vm[0].caf = 1000;
 641         memcpy(mem->vm[0].name, "KVMguest", 8);
 642         ASCEBC(mem->vm[0].name, 8);
 643         memcpy(mem->vm[0].cpi, "KVM/Linux       ", 16);
 644         ASCEBC(mem->vm[0].cpi, 16);
 645 }
 646
 647 static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, u8 ar,
 648                                  u8 fc, u8 sel1, u16 sel2)
 649 {
 650         vcpu->run->exit_reason = KVM_EXIT_S390_STSI;
 651         vcpu->run->s390_stsi.addr = addr;
 652         vcpu->run->s390_stsi.ar = ar;
 653         vcpu->run->s390_stsi.fc = fc;
 654         vcpu->run->s390_stsi.sel1 = sel1;
 655         vcpu->run->s390_stsi.sel2 = sel2;
 656 }
 657
 658 static int handle_stsi(struct kvm_vcpu *vcpu)
 659 {
 660         int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
 661         int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
 662         int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
 663         unsigned long mem = 0;
 664         u64 operand2;
 665         int rc = 0;
 666         u8 ar;
 667
 668         vcpu->stat.instruction_stsi++;
 669         VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2);
 670
 671         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 672                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 673
 674         if (fc > 3) {
 675                 kvm_s390_set_psw_cc(vcpu, 3);
 676                 return 0;
 677         }
 678
 679         if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
 680             || vcpu->run->s.regs.gprs[1] & 0xffff0000)
 681                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 682
 683         if (fc == 0) {
 684                 vcpu->run->s.regs.gprs[0] = 3 << 28;
 685                 kvm_s390_set_psw_cc(vcpu, 0);
 686                 return 0;
 687         }
 688
 689         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 690
 691         if (operand2 & 0xfff)
 692                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 693
 694         switch (fc) {
 695         case 1: /* same handling for 1 and 2 */
 696         case 2:
 697                 mem = get_zeroed_page(GFP_KERNEL);
 698                 if (!mem)
 699                         goto out_no_data;
 700                 if (stsi((void *) mem, fc, sel1, sel2))
 701                         goto out_no_data;
 702                 break;
 703         case 3:
 704                 if (sel1 != 2 || sel2 != 2)
 705                         goto out_no_data;
 706                 mem = get_zeroed_page(GFP_KERNEL);
 707                 if (!mem)
 708                         goto out_no_data;
 709                 handle_stsi_3_2_2(vcpu, (void *) mem);
 710                 break;
 711         }
 712
 713         rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE);
 714         if (rc) {
 715                 rc = kvm_s390_inject_prog_cond(vcpu, rc);
 716                 goto out;
 717         }
 718         if (vcpu->kvm->arch.user_stsi) {
 719                 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
 720                 rc = -EREMOTE;
 721         }
 722         trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
 723         free_page(mem);
 724         kvm_s390_set_psw_cc(vcpu, 0);
 725         vcpu->run->s.regs.gprs[0] = 0;
 726         return rc;
 727 out_no_data:
 728         kvm_s390_set_psw_cc(vcpu, 3);
 729 out:
 730         free_page(mem);
 731         return rc;
 732 }
 733
 734 static const intercept_handler_t b2_handlers[256] = {
 735         [0x02] = handle_stidp,
 736         [0x04] = handle_set_clock,
 737         [0x10] = handle_set_prefix,
 738         [0x11] = handle_store_prefix,
 739         [0x12] = handle_store_cpu_address,
 740         [0x14] = kvm_s390_handle_vsie,
 741         [0x21] = handle_ipte_interlock,
 742         [0x29] = handle_iske,
 743         [0x2a] = handle_rrbe,
 744         [0x2b] = handle_sske,
 745         [0x2c] = handle_test_block,
 746         [0x30] = handle_io_inst,
 747         [0x31] = handle_io_inst,
 748         [0x32] = handle_io_inst,
 749         [0x33] = handle_io_inst,
 750         [0x34] = handle_io_inst,
 751         [0x35] = handle_io_inst,
 752         [0x36] = handle_io_inst,
 753         [0x37] = handle_io_inst,
 754         [0x38] = handle_io_inst,
 755         [0x39] = handle_io_inst,
 756         [0x3a] = handle_io_inst,
 757         [0x3b] = handle_io_inst,
 758         [0x3c] = handle_io_inst,
 759         [0x50] = handle_ipte_interlock,
 760         [0x5f] = handle_io_inst,
 761         [0x74] = handle_io_inst,
 762         [0x76] = handle_io_inst,
 763         [0x7d] = handle_stsi,
 764         [0xb1] = handle_stfl,
 765         [0xb2] = handle_lpswe,
 766 };
 767
 768 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
 769 {
 770         intercept_handler_t handler;
 771
 772         /*
 773          * A lot of B2 instructions are priviledged. Here we check for
 774          * the privileged ones, that we can handle in the kernel.
 775          * Anything else goes to userspace.
 776          */
 777         handler = b2_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
 778         if (handler)
 779                 return handler(vcpu);
 780
 781         return -EOPNOTSUPP;
 782 }
 783
 784 static int handle_epsw(struct kvm_vcpu *vcpu)
 785 {
 786         int reg1, reg2;
 787
 788         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 789
 790         /* This basically extracts the mask half of the psw. */
 791         vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
 792         vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
 793         if (reg2) {
 794                 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
 795                 vcpu->run->s.regs.gprs[reg2] |=
 796                         vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
 797         }
 798         return 0;
 799 }
 800
 801 #define PFMF_RESERVED   0xfffc0101UL
 802 #define PFMF_SK         0x00020000UL
 803 #define PFMF_CF         0x00010000UL
 804 #define PFMF_UI         0x00008000UL
 805 #define PFMF_FSC        0x00007000UL
 806 #define PFMF_NQ         0x00000800UL
 807 #define PFMF_MR         0x00000400UL
 808 #define PFMF_MC         0x00000200UL
 809 #define PFMF_KEY        0x000000feUL
 810
 811 static int handle_pfmf(struct kvm_vcpu *vcpu)
 812 {
 813         bool mr = false, mc = false, nq;
 814         int reg1, reg2;
 815         unsigned long start, end;
 816         unsigned char key;
 817
 818         vcpu->stat.instruction_pfmf++;
 819
 820         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 821
 822         if (!test_kvm_facility(vcpu->kvm, 8))
 823                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
 824
 825         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 826                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 827
 828         if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
 829                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 830
 831         /* Only provide non-quiescing support if enabled for the guest */
 832         if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ &&
 833             !test_kvm_facility(vcpu->kvm, 14))
 834                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 835
 836         /* Only provide conditional-SSKE support if enabled for the guest */
 837         if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK &&
 838             test_kvm_facility(vcpu->kvm, 10)) {
 839                 mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR;
 840                 mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC;
 841         }
 842
 843         nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ;
 844         key = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY;
 845         start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 846         start = kvm_s390_logical_to_effective(vcpu, start);
 847
 848         if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
 849                 if (kvm_s390_check_low_addr_prot_real(vcpu, start))
 850                         return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
 851         }
 852
 853         switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
 854         case 0x00000000:
 855                 /* only 4k frames specify a real address */
 856                 start = kvm_s390_real_to_abs(vcpu, start);
 857                 end = (start + (1UL << 12)) & ~((1UL << 12) - 1);
 858                 break;
 859         case 0x00001000:
 860                 end = (start + (1UL << 20)) & ~((1UL << 20) - 1);
 861                 break;
 862         case 0x00002000:
 863                 /* only support 2G frame size if EDAT2 is available and we are
 864                    not in 24-bit addressing mode */
 865                 if (!test_kvm_facility(vcpu->kvm, 78) ||
 866                     psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_AMODE_24BIT)
 867                         return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 868                 end = (start + (1UL << 31)) & ~((1UL << 31) - 1);
 869                 break;
 870         default:
 871                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 872         }
 873
 874         while (start != end) {
 875                 unsigned long useraddr;
 876
 877                 /* Translate guest address to host address */
 878                 useraddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
 879                 if (kvm_is_error_hva(useraddr))
 880                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 881
 882                 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
 883                         if (clear_user((void __user *)useraddr, PAGE_SIZE))
 884                                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 885                 }
 886
 887                 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
 888                         int rc = __skey_check_enable(vcpu);
 889
 890                         if (rc)
 891                                 return rc;
 892                         down_read(&current->mm->mmap_sem);
 893                         rc = cond_set_guest_storage_key(current->mm, useraddr,
 894                                                         key, NULL, nq, mr, mc);
 895                         up_read(&current->mm->mmap_sem);
 896                         if (rc < 0)
 897                                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 898                 }
 899
 900                 start += PAGE_SIZE;
 901         }
 902         if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
 903                 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_AMODE_64BIT) {
 904                         vcpu->run->s.regs.gprs[reg2] = end;
 905                 } else {
 906                         vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL;
 907                         end = kvm_s390_logical_to_effective(vcpu, end);
 908                         vcpu->run->s.regs.gprs[reg2] |= end;
 909                 }
 910         }
 911         return 0;
 912 }
 913
 914 static int handle_essa(struct kvm_vcpu *vcpu)
 915 {
 916         /* entries expected to be 1FF */
 917         int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
 918         unsigned long *cbrlo;
 919         struct gmap *gmap;
 920         int i;
 921
 922         VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries);
 923         gmap = vcpu->arch.gmap;
 924         vcpu->stat.instruction_essa++;
 925         if (!vcpu->kvm->arch.use_cmma)
 926                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
 927
 928         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 929                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 930
 931         if (((vcpu->arch.sie_block->ipb & 0xf0000000) >> 28) > 6)
 932                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 933
 934         /* Retry the ESSA instruction */
 935         kvm_s390_retry_instr(vcpu);
 936         vcpu->arch.sie_block->cbrlo &= PAGE_MASK;       /* reset nceo */
 937         cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
 938         down_read(&gmap->mm->mmap_sem);
 939         for (i = 0; i < entries; ++i)
 940                 __gmap_zap(gmap, cbrlo[i]);
 941         up_read(&gmap->mm->mmap_sem);
 942         return 0;
 943 }
 944
 945 static const intercept_handler_t b9_handlers[256] = {
 946         [0x8a] = handle_ipte_interlock,
 947         [0x8d] = handle_epsw,
 948         [0x8e] = handle_ipte_interlock,
 949         [0x8f] = handle_ipte_interlock,
 950         [0xab] = handle_essa,
 951         [0xaf] = handle_pfmf,
 952 };
 953
 954 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
 955 {
 956         intercept_handler_t handler;
 957
 958         /* This is handled just as for the B2 instructions. */
 959         handler = b9_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
 960         if (handler)
 961                 return handler(vcpu);
 962
 963         return -EOPNOTSUPP;
 964 }
 965
 966 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
 967 {
 968         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
 969         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
 970         int reg, rc, nr_regs;
 971         u32 ctl_array[16];
 972         u64 ga;
 973         u8 ar;
 974
 975         vcpu->stat.instruction_lctl++;
 976
 977         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 978                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 979
 980         ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
 981
 982         if (ga & 3)
 983                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 984
 985         VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
 986         trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga);
 987
 988         nr_regs = ((reg3 - reg1) & 0xf) + 1;
 989         rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
 990         if (rc)
 991                 return kvm_s390_inject_prog_cond(vcpu, rc);
 992         reg = reg1;
 993         nr_regs = 0;
 994         do {
 995                 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
 996                 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++];
 997                 if (reg == reg3)
 998                         break;
 999                 reg = (reg + 1) % 16;
1000         } while (1);
1001         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1002         return 0;
1003 }
1004
1005 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu)
1006 {
1007         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1008         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1009         int reg, rc, nr_regs;
1010         u32 ctl_array[16];
1011         u64 ga;
1012         u8 ar;
1013
1014         vcpu->stat.instruction_stctl++;
1015
1016         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1017                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1018
1019         ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1020
1021         if (ga & 3)
1022                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1023
1024         VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1025         trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga);
1026
1027         reg = reg1;
1028         nr_regs = 0;
1029         do {
1030                 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1031                 if (reg == reg3)
1032                         break;
1033                 reg = (reg + 1) % 16;
1034         } while (1);
1035         rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1036         return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1037 }
1038
1039 static int handle_lctlg(struct kvm_vcpu *vcpu)
1040 {
1041         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1042         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1043         int reg, rc, nr_regs;
1044         u64 ctl_array[16];
1045         u64 ga;
1046         u8 ar;
1047
1048         vcpu->stat.instruction_lctlg++;
1049
1050         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1051                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1052
1053         ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1054
1055         if (ga & 7)
1056                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1057
1058         VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1059         trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga);
1060
1061         nr_regs = ((reg3 - reg1) & 0xf) + 1;
1062         rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1063         if (rc)
1064                 return kvm_s390_inject_prog_cond(vcpu, rc);
1065         reg = reg1;
1066         nr_regs = 0;
1067         do {
1068                 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++];
1069                 if (reg == reg3)
1070                         break;
1071                 reg = (reg + 1) % 16;
1072         } while (1);
1073         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1074         return 0;
1075 }
1076
1077 static int handle_stctg(struct kvm_vcpu *vcpu)
1078 {
1079         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1080         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1081         int reg, rc, nr_regs;
1082         u64 ctl_array[16];
1083         u64 ga;
1084         u8 ar;
1085
1086         vcpu->stat.instruction_stctg++;
1087
1088         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1089                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1090
1091         ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1092
1093         if (ga & 7)
1094                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1095
1096         VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1097         trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga);
1098
1099         reg = reg1;
1100         nr_regs = 0;
1101         do {
1102                 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1103                 if (reg == reg3)
1104                         break;
1105                 reg = (reg + 1) % 16;
1106         } while (1);
1107         rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1108         return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1109 }
1110
1111 static const intercept_handler_t eb_handlers[256] = {
1112         [0x2f] = handle_lctlg,
1113         [0x25] = handle_stctg,
1114         [0x60] = handle_ri,
1115         [0x61] = handle_ri,
1116         [0x62] = handle_ri,
1117 };
1118
1119 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
1120 {
1121         intercept_handler_t handler;
1122
1123         handler = eb_handlers[vcpu->arch.sie_block->ipb & 0xff];
1124         if (handler)
1125                 return handler(vcpu);
1126         return -EOPNOTSUPP;
1127 }
1128
1129 static int handle_tprot(struct kvm_vcpu *vcpu)
1130 {
1131         u64 address1, address2;
1132         unsigned long hva, gpa;
1133         int ret = 0, cc = 0;
1134         bool writable;
1135         u8 ar;
1136
1137         vcpu->stat.instruction_tprot++;
1138
1139         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1140                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1141
1142         kvm_s390_get_base_disp_sse(vcpu, &address1, &address2, &ar, NULL);
1143
1144         /* we only handle the Linux memory detection case:
1145          * access key == 0
1146          * everything else goes to userspace. */
1147         if (address2 & 0xf0)
1148                 return -EOPNOTSUPP;
1149         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1150                 ipte_lock(vcpu);
1151         ret = guest_translate_address(vcpu, address1, ar, &gpa, GACC_STORE);
1152         if (ret == PGM_PROTECTION) {
1153                 /* Write protected? Try again with read-only... */
1154                 cc = 1;
1155                 ret = guest_translate_address(vcpu, address1, ar, &gpa,
1156                                               GACC_FETCH);
1157         }
1158         if (ret) {
1159                 if (ret == PGM_ADDRESSING || ret == PGM_TRANSLATION_SPEC) {
1160                         ret = kvm_s390_inject_program_int(vcpu, ret);
1161                 } else if (ret > 0) {
1162                         /* Translation not available */
1163                         kvm_s390_set_psw_cc(vcpu, 3);
1164                         ret = 0;
1165                 }
1166                 goto out_unlock;
1167         }
1168
1169         hva = gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable);
1170         if (kvm_is_error_hva(hva)) {
1171                 ret = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1172         } else {
1173                 if (!writable)
1174                         cc = 1;         /* Write not permitted ==> read-only */
1175                 kvm_s390_set_psw_cc(vcpu, cc);
1176                 /* Note: CC2 only occurs for storage keys (not supported yet) */
1177         }
1178 out_unlock:
1179         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1180                 ipte_unlock(vcpu);
1181         return ret;
1182 }
1183
1184 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
1185 {
1186         /* For e5xx... instructions we only handle TPROT */
1187         if ((vcpu->arch.sie_block->ipa & 0x00ff) == 0x01)
1188                 return handle_tprot(vcpu);
1189         return -EOPNOTSUPP;
1190 }
1191
1192 static int handle_sckpf(struct kvm_vcpu *vcpu)
1193 {
1194         u32 value;
1195
1196         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1197                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1198
1199         if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
1200                 return kvm_s390_inject_program_int(vcpu,
1201                                                    PGM_SPECIFICATION);
1202
1203         value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
1204         vcpu->arch.sie_block->todpr = value;
1205
1206         return 0;
1207 }
1208
1209 static int handle_ptff(struct kvm_vcpu *vcpu)
1210 {
1211         /* we don't emulate any control instructions yet */
1212         kvm_s390_set_psw_cc(vcpu, 3);
1213         return 0;
1214 }
1215
1216 static const intercept_handler_t x01_handlers[256] = {
1217         [0x04] = handle_ptff,
1218         [0x07] = handle_sckpf,
1219 };
1220
1221 int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
1222 {
1223         intercept_handler_t handler;
1224
1225         handler = x01_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
1226         if (handler)
1227                 return handler(vcpu);
1228         return -EOPNOTSUPP;
1229 }