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