arch/s390/kvm/priv.c

   1 /*
   2  * handling privileged instructions
   3  *
   4  * Copyright IBM Corp. 2008, 2013
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License (version 2 only)
   8  * as published by the Free Software Foundation.
   9  *
  10  *    Author(s): Carsten Otte <cotte@de.ibm.com>
  11  *               Christian Borntraeger <borntraeger@de.ibm.com>
  12  */
  13
  14 #include <linux/kvm.h>
  15 #include <linux/gfp.h>
  16 #include <linux/errno.h>
  17 #include <linux/compat.h>
  18 #include <asm/asm-offsets.h>
  19 #include <asm/facility.h>
  20 #include <asm/current.h>
  21 #include <asm/debug.h>
  22 #include <asm/ebcdic.h>
  23 #include <asm/sysinfo.h>
  24 #include <asm/pgtable.h>
  25 #include <asm/pgalloc.h>
  26 #include <asm/io.h>
  27 #include <asm/ptrace.h>
  28 #include <asm/compat.h>
  29 #include "gaccess.h"
  30 #include "kvm-s390.h"
  31 #include "trace.h"
  32
  33 /* Handle SCK (SET CLOCK) interception */
  34 static int handle_set_clock(struct kvm_vcpu *vcpu)
  35 {
  36         struct kvm_vcpu *cpup;
  37         s64 hostclk, val;
  38         int i, rc;
  39         ar_t ar;
  40         u64 op2;
  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         if (store_tod_clock(&hostclk)) {
  53                 kvm_s390_set_psw_cc(vcpu, 3);
  54                 return 0;
  55         }
  56         val = (val - hostclk) & ~0x3fUL;
  57
  58         mutex_lock(&vcpu->kvm->lock);
  59         kvm_for_each_vcpu(i, cpup, vcpu->kvm)
  60                 cpup->arch.sie_block->epoch = val;
  61         mutex_unlock(&vcpu->kvm->lock);
  62
  63         kvm_s390_set_psw_cc(vcpu, 0);
  64         return 0;
  65 }
  66
  67 static int handle_set_prefix(struct kvm_vcpu *vcpu)
  68 {
  69         u64 operand2;
  70         u32 address;
  71         int rc;
  72         ar_t ar;
  73
  74         vcpu->stat.instruction_spx++;
  75
  76         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
  77                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
  78
  79         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
  80
  81         /* must be word boundary */
  82         if (operand2 & 3)
  83                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
  84
  85         /* get the value */
  86         rc = read_guest(vcpu, operand2, ar, &address, sizeof(address));
  87         if (rc)
  88                 return kvm_s390_inject_prog_cond(vcpu, rc);
  89
  90         address &= 0x7fffe000u;
  91
  92         /*
  93          * Make sure the new value is valid memory. We only need to check the
  94          * first page, since address is 8k aligned and memory pieces are always
  95          * at least 1MB aligned and have at least a size of 1MB.
  96          */
  97         if (kvm_is_error_gpa(vcpu->kvm, address))
  98                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
  99
 100         kvm_s390_set_prefix(vcpu, address);
 101
 102         VCPU_EVENT(vcpu, 5, "setting prefix to %x", address);
 103         trace_kvm_s390_handle_prefix(vcpu, 1, address);
 104         return 0;
 105 }
 106
 107 static int handle_store_prefix(struct kvm_vcpu *vcpu)
 108 {
 109         u64 operand2;
 110         u32 address;
 111         int rc;
 112         ar_t ar;
 113
 114         vcpu->stat.instruction_stpx++;
 115
 116         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 117                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 118
 119         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 120
 121         /* must be word boundary */
 122         if (operand2 & 3)
 123                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 124
 125         address = kvm_s390_get_prefix(vcpu);
 126
 127         /* get the value */
 128         rc = write_guest(vcpu, operand2, ar, &address, sizeof(address));
 129         if (rc)
 130                 return kvm_s390_inject_prog_cond(vcpu, rc);
 131
 132         VCPU_EVENT(vcpu, 5, "storing prefix to %x", address);
 133         trace_kvm_s390_handle_prefix(vcpu, 0, address);
 134         return 0;
 135 }
 136
 137 static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
 138 {
 139         u16 vcpu_id = vcpu->vcpu_id;
 140         u64 ga;
 141         int rc;
 142         ar_t ar;
 143
 144         vcpu->stat.instruction_stap++;
 145
 146         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 147                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 148
 149         ga = kvm_s390_get_base_disp_s(vcpu, &ar);
 150
 151         if (ga & 1)
 152                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 153
 154         rc = write_guest(vcpu, ga, ar, &vcpu_id, sizeof(vcpu_id));
 155         if (rc)
 156                 return kvm_s390_inject_prog_cond(vcpu, rc);
 157
 158         VCPU_EVENT(vcpu, 5, "storing cpu address to %llx", ga);
 159         trace_kvm_s390_handle_stap(vcpu, ga);
 160         return 0;
 161 }
 162
 163 static int __skey_check_enable(struct kvm_vcpu *vcpu)
 164 {
 165         int rc = 0;
 166         if (!(vcpu->arch.sie_block->ictl & (ICTL_ISKE | ICTL_SSKE | ICTL_RRBE)))
 167                 return rc;
 168
 169         rc = s390_enable_skey();
 170         trace_kvm_s390_skey_related_inst(vcpu);
 171         vcpu->arch.sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | ICTL_RRBE);
 172         return rc;
 173 }
 174
 175
 176 static int handle_skey(struct kvm_vcpu *vcpu)
 177 {
 178         int rc = __skey_check_enable(vcpu);
 179
 180         if (rc)
 181                 return rc;
 182         vcpu->stat.instruction_storage_key++;
 183
 184         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 185                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 186
 187         kvm_s390_rewind_psw(vcpu, 4);
 188         VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
 189         return 0;
 190 }
 191
 192 static int handle_ipte_interlock(struct kvm_vcpu *vcpu)
 193 {
 194         vcpu->stat.instruction_ipte_interlock++;
 195         if (psw_bits(vcpu->arch.sie_block->gpsw).p)
 196                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 197         wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu));
 198         kvm_s390_rewind_psw(vcpu, 4);
 199         VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation");
 200         return 0;
 201 }
 202
 203 static int handle_test_block(struct kvm_vcpu *vcpu)
 204 {
 205         gpa_t addr;
 206         int reg2;
 207
 208         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 209                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 210
 211         kvm_s390_get_regs_rre(vcpu, NULL, &reg2);
 212         addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 213         addr = kvm_s390_logical_to_effective(vcpu, addr);
 214         if (kvm_s390_check_low_addr_prot_real(vcpu, addr))
 215                 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
 216         addr = kvm_s390_real_to_abs(vcpu, addr);
 217
 218         if (kvm_is_error_gpa(vcpu->kvm, addr))
 219                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 220         /*
 221          * We don't expect errors on modern systems, and do not care
 222          * about storage keys (yet), so let's just clear the page.
 223          */
 224         if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE))
 225                 return -EFAULT;
 226         kvm_s390_set_psw_cc(vcpu, 0);
 227         vcpu->run->s.regs.gprs[0] = 0;
 228         return 0;
 229 }
 230
 231 static int handle_tpi(struct kvm_vcpu *vcpu)
 232 {
 233         struct kvm_s390_interrupt_info *inti;
 234         unsigned long len;
 235         u32 tpi_data[3];
 236         int rc;
 237         u64 addr;
 238         ar_t ar;
 239
 240         addr = kvm_s390_get_base_disp_s(vcpu, &ar);
 241         if (addr & 3)
 242                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 243
 244         inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0);
 245         if (!inti) {
 246                 kvm_s390_set_psw_cc(vcpu, 0);
 247                 return 0;
 248         }
 249
 250         tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr;
 251         tpi_data[1] = inti->io.io_int_parm;
 252         tpi_data[2] = inti->io.io_int_word;
 253         if (addr) {
 254                 /*
 255                  * Store the two-word I/O interruption code into the
 256                  * provided area.
 257                  */
 258                 len = sizeof(tpi_data) - 4;
 259                 rc = write_guest(vcpu, addr, ar, &tpi_data, len);
 260                 if (rc) {
 261                         rc = kvm_s390_inject_prog_cond(vcpu, rc);
 262                         goto reinject_interrupt;
 263                 }
 264         } else {
 265                 /*
 266                  * Store the three-word I/O interruption code into
 267                  * the appropriate lowcore area.
 268                  */
 269                 len = sizeof(tpi_data);
 270                 if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) {
 271                         /* failed writes to the low core are not recoverable */
 272                         rc = -EFAULT;
 273                         goto reinject_interrupt;
 274                 }
 275         }
 276
 277         /* irq was successfully handed to the guest */
 278         kfree(inti);
 279         kvm_s390_set_psw_cc(vcpu, 1);
 280         return 0;
 281 reinject_interrupt:
 282         /*
 283          * If we encounter a problem storing the interruption code, the
 284          * instruction is suppressed from the guest's view: reinject the
 285          * interrupt.
 286          */
 287         if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) {
 288                 kfree(inti);
 289                 rc = -EFAULT;
 290         }
 291         /* don't set the cc, a pgm irq was injected or we drop to user space */
 292         return rc ? -EFAULT : 0;
 293 }
 294
 295 static int handle_tsch(struct kvm_vcpu *vcpu)
 296 {
 297         struct kvm_s390_interrupt_info *inti = NULL;
 298         const u64 isc_mask = 0xffUL << 24; /* all iscs set */
 299
 300         /* a valid schid has at least one bit set */
 301         if (vcpu->run->s.regs.gprs[1])
 302                 inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask,
 303                                            vcpu->run->s.regs.gprs[1]);
 304
 305         /*
 306          * Prepare exit to userspace.
 307          * We indicate whether we dequeued a pending I/O interrupt
 308          * so that userspace can re-inject it if the instruction gets
 309          * a program check. While this may re-order the pending I/O
 310          * interrupts, this is no problem since the priority is kept
 311          * intact.
 312          */
 313         vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
 314         vcpu->run->s390_tsch.dequeued = !!inti;
 315         if (inti) {
 316                 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
 317                 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
 318                 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
 319                 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
 320         }
 321         vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
 322         kfree(inti);
 323         return -EREMOTE;
 324 }
 325
 326 static int handle_io_inst(struct kvm_vcpu *vcpu)
 327 {
 328         VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
 329
 330         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 331                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 332
 333         if (vcpu->kvm->arch.css_support) {
 334                 /*
 335                  * Most I/O instructions will be handled by userspace.
 336                  * Exceptions are tpi and the interrupt portion of tsch.
 337                  */
 338                 if (vcpu->arch.sie_block->ipa == 0xb236)
 339                         return handle_tpi(vcpu);
 340                 if (vcpu->arch.sie_block->ipa == 0xb235)
 341                         return handle_tsch(vcpu);
 342                 /* Handle in userspace. */
 343                 return -EOPNOTSUPP;
 344         } else {
 345                 /*
 346                  * Set condition code 3 to stop the guest from issuing channel
 347                  * I/O instructions.
 348                  */
 349                 kvm_s390_set_psw_cc(vcpu, 3);
 350                 return 0;
 351         }
 352 }
 353
 354 static int handle_stfl(struct kvm_vcpu *vcpu)
 355 {
 356         int rc;
 357         unsigned int fac;
 358
 359         vcpu->stat.instruction_stfl++;
 360
 361         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 362                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 363
 364         /*
 365          * We need to shift the lower 32 facility bits (bit 0-31) from a u64
 366          * into a u32 memory representation. They will remain bits 0-31.
 367          */
 368         fac = *vcpu->kvm->arch.model.fac->list >> 32;
 369         rc = write_guest_lc(vcpu, offsetof(struct _lowcore, stfl_fac_list),
 370                             &fac, sizeof(fac));
 371         if (rc)
 372                 return rc;
 373         VCPU_EVENT(vcpu, 5, "store facility list value %x", fac);
 374         trace_kvm_s390_handle_stfl(vcpu, fac);
 375         return 0;
 376 }
 377
 378 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
 379 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
 380 #define PSW_ADDR_24 0x0000000000ffffffUL
 381 #define PSW_ADDR_31 0x000000007fffffffUL
 382
 383 int is_valid_psw(psw_t *psw)
 384 {
 385         if (psw->mask & PSW_MASK_UNASSIGNED)
 386                 return 0;
 387         if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
 388                 if (psw->addr & ~PSW_ADDR_31)
 389                         return 0;
 390         }
 391         if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
 392                 return 0;
 393         if ((psw->mask & PSW_MASK_ADDR_MODE) ==  PSW_MASK_EA)
 394                 return 0;
 395         if (psw->addr & 1)
 396                 return 0;
 397         return 1;
 398 }
 399
 400 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
 401 {
 402         psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
 403         psw_compat_t new_psw;
 404         u64 addr;
 405         int rc;
 406         ar_t ar;
 407
 408         if (gpsw->mask & PSW_MASK_PSTATE)
 409                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 410
 411         addr = kvm_s390_get_base_disp_s(vcpu, &ar);
 412         if (addr & 7)
 413                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 414
 415         rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
 416         if (rc)
 417                 return kvm_s390_inject_prog_cond(vcpu, rc);
 418         if (!(new_psw.mask & PSW32_MASK_BASE))
 419                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 420         gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
 421         gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
 422         gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
 423         if (!is_valid_psw(gpsw))
 424                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 425         return 0;
 426 }
 427
 428 static int handle_lpswe(struct kvm_vcpu *vcpu)
 429 {
 430         psw_t new_psw;
 431         u64 addr;
 432         int rc;
 433         ar_t ar;
 434
 435         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 436                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 437
 438         addr = kvm_s390_get_base_disp_s(vcpu, &ar);
 439         if (addr & 7)
 440                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 441         rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
 442         if (rc)
 443                 return kvm_s390_inject_prog_cond(vcpu, rc);
 444         vcpu->arch.sie_block->gpsw = new_psw;
 445         if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
 446                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 447         return 0;
 448 }
 449
 450 static int handle_stidp(struct kvm_vcpu *vcpu)
 451 {
 452         u64 stidp_data = vcpu->arch.stidp_data;
 453         u64 operand2;
 454         int rc;
 455         ar_t ar;
 456
 457         vcpu->stat.instruction_stidp++;
 458
 459         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 460                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 461
 462         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 463
 464         if (operand2 & 7)
 465                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 466
 467         rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data));
 468         if (rc)
 469                 return kvm_s390_inject_prog_cond(vcpu, rc);
 470
 471         VCPU_EVENT(vcpu, 5, "%s", "store cpu id");
 472         return 0;
 473 }
 474
 475 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
 476 {
 477         int cpus = 0;
 478         int n;
 479
 480         cpus = atomic_read(&vcpu->kvm->online_vcpus);
 481
 482         /* deal with other level 3 hypervisors */
 483         if (stsi(mem, 3, 2, 2))
 484                 mem->count = 0;
 485         if (mem->count < 8)
 486                 mem->count++;
 487         for (n = mem->count - 1; n > 0 ; n--)
 488                 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
 489
 490         memset(&mem->vm[0], 0, sizeof(mem->vm[0]));
 491         mem->vm[0].cpus_total = cpus;
 492         mem->vm[0].cpus_configured = cpus;
 493         mem->vm[0].cpus_standby = 0;
 494         mem->vm[0].cpus_reserved = 0;
 495         mem->vm[0].caf = 1000;
 496         memcpy(mem->vm[0].name, "KVMguest", 8);
 497         ASCEBC(mem->vm[0].name, 8);
 498         memcpy(mem->vm[0].cpi, "KVM/Linux       ", 16);
 499         ASCEBC(mem->vm[0].cpi, 16);
 500 }
 501
 502 static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, ar_t ar,
 503                                  u8 fc, u8 sel1, u16 sel2)
 504 {
 505         vcpu->run->exit_reason = KVM_EXIT_S390_STSI;
 506         vcpu->run->s390_stsi.addr = addr;
 507         vcpu->run->s390_stsi.ar = ar;
 508         vcpu->run->s390_stsi.fc = fc;
 509         vcpu->run->s390_stsi.sel1 = sel1;
 510         vcpu->run->s390_stsi.sel2 = sel2;
 511 }
 512
 513 static int handle_stsi(struct kvm_vcpu *vcpu)
 514 {
 515         int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
 516         int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
 517         int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
 518         unsigned long mem = 0;
 519         u64 operand2;
 520         int rc = 0;
 521         ar_t ar;
 522
 523         vcpu->stat.instruction_stsi++;
 524         VCPU_EVENT(vcpu, 4, "stsi: fc: %x sel1: %x sel2: %x", fc, sel1, sel2);
 525
 526         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 527                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 528
 529         if (fc > 3) {
 530                 kvm_s390_set_psw_cc(vcpu, 3);
 531                 return 0;
 532         }
 533
 534         if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
 535             || vcpu->run->s.regs.gprs[1] & 0xffff0000)
 536                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 537
 538         if (fc == 0) {
 539                 vcpu->run->s.regs.gprs[0] = 3 << 28;
 540                 kvm_s390_set_psw_cc(vcpu, 0);
 541                 return 0;
 542         }
 543
 544         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 545
 546         if (operand2 & 0xfff)
 547                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 548
 549         switch (fc) {
 550         case 1: /* same handling for 1 and 2 */
 551         case 2:
 552                 mem = get_zeroed_page(GFP_KERNEL);
 553                 if (!mem)
 554                         goto out_no_data;
 555                 if (stsi((void *) mem, fc, sel1, sel2))
 556                         goto out_no_data;
 557                 break;
 558         case 3:
 559                 if (sel1 != 2 || sel2 != 2)
 560                         goto out_no_data;
 561                 mem = get_zeroed_page(GFP_KERNEL);
 562                 if (!mem)
 563                         goto out_no_data;
 564                 handle_stsi_3_2_2(vcpu, (void *) mem);
 565                 break;
 566         }
 567
 568         rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE);
 569         if (rc) {
 570                 rc = kvm_s390_inject_prog_cond(vcpu, rc);
 571                 goto out;
 572         }
 573         if (vcpu->kvm->arch.user_stsi) {
 574                 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
 575                 rc = -EREMOTE;
 576         }
 577         trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
 578         free_page(mem);
 579         kvm_s390_set_psw_cc(vcpu, 0);
 580         vcpu->run->s.regs.gprs[0] = 0;
 581         return rc;
 582 out_no_data:
 583         kvm_s390_set_psw_cc(vcpu, 3);
 584 out:
 585         free_page(mem);
 586         return rc;
 587 }
 588
 589 static const intercept_handler_t b2_handlers[256] = {
 590         [0x02] = handle_stidp,
 591         [0x04] = handle_set_clock,
 592         [0x10] = handle_set_prefix,
 593         [0x11] = handle_store_prefix,
 594         [0x12] = handle_store_cpu_address,
 595         [0x21] = handle_ipte_interlock,
 596         [0x29] = handle_skey,
 597         [0x2a] = handle_skey,
 598         [0x2b] = handle_skey,
 599         [0x2c] = handle_test_block,
 600         [0x30] = handle_io_inst,
 601         [0x31] = handle_io_inst,
 602         [0x32] = handle_io_inst,
 603         [0x33] = handle_io_inst,
 604         [0x34] = handle_io_inst,
 605         [0x35] = handle_io_inst,
 606         [0x36] = handle_io_inst,
 607         [0x37] = handle_io_inst,
 608         [0x38] = handle_io_inst,
 609         [0x39] = handle_io_inst,
 610         [0x3a] = handle_io_inst,
 611         [0x3b] = handle_io_inst,
 612         [0x3c] = handle_io_inst,
 613         [0x50] = handle_ipte_interlock,
 614         [0x5f] = handle_io_inst,
 615         [0x74] = handle_io_inst,
 616         [0x76] = handle_io_inst,
 617         [0x7d] = handle_stsi,
 618         [0xb1] = handle_stfl,
 619         [0xb2] = handle_lpswe,
 620 };
 621
 622 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
 623 {
 624         intercept_handler_t handler;
 625
 626         /*
 627          * A lot of B2 instructions are priviledged. Here we check for
 628          * the privileged ones, that we can handle in the kernel.
 629          * Anything else goes to userspace.
 630          */
 631         handler = b2_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
 632         if (handler)
 633                 return handler(vcpu);
 634
 635         return -EOPNOTSUPP;
 636 }
 637
 638 static int handle_epsw(struct kvm_vcpu *vcpu)
 639 {
 640         int reg1, reg2;
 641
 642         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 643
 644         /* This basically extracts the mask half of the psw. */
 645         vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
 646         vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
 647         if (reg2) {
 648                 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
 649                 vcpu->run->s.regs.gprs[reg2] |=
 650                         vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
 651         }
 652         return 0;
 653 }
 654
 655 #define PFMF_RESERVED   0xfffc0101UL
 656 #define PFMF_SK         0x00020000UL
 657 #define PFMF_CF         0x00010000UL
 658 #define PFMF_UI         0x00008000UL
 659 #define PFMF_FSC        0x00007000UL
 660 #define PFMF_NQ         0x00000800UL
 661 #define PFMF_MR         0x00000400UL
 662 #define PFMF_MC         0x00000200UL
 663 #define PFMF_KEY        0x000000feUL
 664
 665 static int handle_pfmf(struct kvm_vcpu *vcpu)
 666 {
 667         int reg1, reg2;
 668         unsigned long start, end;
 669
 670         vcpu->stat.instruction_pfmf++;
 671
 672         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 673
 674         if (!MACHINE_HAS_PFMF)
 675                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
 676
 677         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 678                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 679
 680         if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
 681                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 682
 683         /* Only provide non-quiescing support if the host supports it */
 684         if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ && !test_facility(14))
 685                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 686
 687         /* No support for conditional-SSKE */
 688         if (vcpu->run->s.regs.gprs[reg1] & (PFMF_MR | PFMF_MC))
 689                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 690
 691         start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 692         start = kvm_s390_logical_to_effective(vcpu, start);
 693
 694         switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
 695         case 0x00000000:
 696                 end = (start + (1UL << 12)) & ~((1UL << 12) - 1);
 697                 break;
 698         case 0x00001000:
 699                 end = (start + (1UL << 20)) & ~((1UL << 20) - 1);
 700                 break;
 701         case 0x00002000:
 702                 /* only support 2G frame size if EDAT2 is available and we are
 703                    not in 24-bit addressing mode */
 704                 if (!test_kvm_facility(vcpu->kvm, 78) ||
 705                     psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_AMODE_24BIT)
 706                         return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 707                 end = (start + (1UL << 31)) & ~((1UL << 31) - 1);
 708                 break;
 709         default:
 710                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 711         }
 712
 713         if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
 714                 if (kvm_s390_check_low_addr_prot_real(vcpu, start))
 715                         return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
 716         }
 717
 718         while (start < end) {
 719                 unsigned long useraddr, abs_addr;
 720
 721                 /* Translate guest address to host address */
 722                 if ((vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) == 0)
 723                         abs_addr = kvm_s390_real_to_abs(vcpu, start);
 724                 else
 725                         abs_addr = start;
 726                 useraddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(abs_addr));
 727                 if (kvm_is_error_hva(useraddr))
 728                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 729
 730                 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
 731                         if (clear_user((void __user *)useraddr, PAGE_SIZE))
 732                                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 733                 }
 734
 735                 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
 736                         int rc = __skey_check_enable(vcpu);
 737
 738                         if (rc)
 739                                 return rc;
 740                         if (set_guest_storage_key(current->mm, useraddr,
 741                                         vcpu->run->s.regs.gprs[reg1] & PFMF_KEY,
 742                                         vcpu->run->s.regs.gprs[reg1] & PFMF_NQ))
 743                                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 744                 }
 745
 746                 start += PAGE_SIZE;
 747         }
 748         if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC)
 749                 vcpu->run->s.regs.gprs[reg2] = end;
 750         return 0;
 751 }
 752
 753 static int handle_essa(struct kvm_vcpu *vcpu)
 754 {
 755         /* entries expected to be 1FF */
 756         int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
 757         unsigned long *cbrlo, cbrle;
 758         struct gmap *gmap;
 759         int i;
 760
 761         VCPU_EVENT(vcpu, 5, "cmma release %d pages", entries);
 762         gmap = vcpu->arch.gmap;
 763         vcpu->stat.instruction_essa++;
 764         if (!kvm_s390_cmma_enabled(vcpu->kvm))
 765                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
 766
 767         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 768                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 769
 770         if (((vcpu->arch.sie_block->ipb & 0xf0000000) >> 28) > 6)
 771                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 772
 773         /* Rewind PSW to repeat the ESSA instruction */
 774         kvm_s390_rewind_psw(vcpu, 4);
 775         vcpu->arch.sie_block->cbrlo &= PAGE_MASK;       /* reset nceo */
 776         cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
 777         down_read(&gmap->mm->mmap_sem);
 778         for (i = 0; i < entries; ++i) {
 779                 cbrle = cbrlo[i];
 780                 if (unlikely(cbrle & ~PAGE_MASK || cbrle < 2 * PAGE_SIZE))
 781                         /* invalid entry */
 782                         break;
 783                 /* try to free backing */
 784                 __gmap_zap(gmap, cbrle);
 785         }
 786         up_read(&gmap->mm->mmap_sem);
 787         if (i < entries)
 788                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 789         return 0;
 790 }
 791
 792 static const intercept_handler_t b9_handlers[256] = {
 793         [0x8a] = handle_ipte_interlock,
 794         [0x8d] = handle_epsw,
 795         [0x8e] = handle_ipte_interlock,
 796         [0x8f] = handle_ipte_interlock,
 797         [0xab] = handle_essa,
 798         [0xaf] = handle_pfmf,
 799 };
 800
 801 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
 802 {
 803         intercept_handler_t handler;
 804
 805         /* This is handled just as for the B2 instructions. */
 806         handler = b9_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
 807         if (handler)
 808                 return handler(vcpu);
 809
 810         return -EOPNOTSUPP;
 811 }
 812
 813 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
 814 {
 815         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
 816         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
 817         int reg, rc, nr_regs;
 818         u32 ctl_array[16];
 819         u64 ga;
 820         ar_t ar;
 821
 822         vcpu->stat.instruction_lctl++;
 823
 824         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 825                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 826
 827         ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
 828
 829         if (ga & 3)
 830                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 831
 832         VCPU_EVENT(vcpu, 5, "lctl r1:%x, r3:%x, addr:%llx", reg1, reg3, ga);
 833         trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga);
 834
 835         nr_regs = ((reg3 - reg1) & 0xf) + 1;
 836         rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
 837         if (rc)
 838                 return kvm_s390_inject_prog_cond(vcpu, rc);
 839         reg = reg1;
 840         nr_regs = 0;
 841         do {
 842                 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
 843                 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++];
 844                 if (reg == reg3)
 845                         break;
 846                 reg = (reg + 1) % 16;
 847         } while (1);
 848         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
 849         return 0;
 850 }
 851
 852 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu)
 853 {
 854         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
 855         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
 856         int reg, rc, nr_regs;
 857         u32 ctl_array[16];
 858         u64 ga;
 859         ar_t ar;
 860
 861         vcpu->stat.instruction_stctl++;
 862
 863         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 864                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 865
 866         ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
 867
 868         if (ga & 3)
 869                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 870
 871         VCPU_EVENT(vcpu, 5, "stctl r1:%x, r3:%x, addr:%llx", reg1, reg3, ga);
 872         trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga);
 873
 874         reg = reg1;
 875         nr_regs = 0;
 876         do {
 877                 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
 878                 if (reg == reg3)
 879                         break;
 880                 reg = (reg + 1) % 16;
 881         } while (1);
 882         rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
 883         return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
 884 }
 885
 886 static int handle_lctlg(struct kvm_vcpu *vcpu)
 887 {
 888         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
 889         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
 890         int reg, rc, nr_regs;
 891         u64 ctl_array[16];
 892         u64 ga;
 893         ar_t ar;
 894
 895         vcpu->stat.instruction_lctlg++;
 896
 897         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 898                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 899
 900         ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
 901
 902         if (ga & 7)
 903                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 904
 905         VCPU_EVENT(vcpu, 5, "lctlg r1:%x, r3:%x, addr:%llx", reg1, reg3, ga);
 906         trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga);
 907
 908         nr_regs = ((reg3 - reg1) & 0xf) + 1;
 909         rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
 910         if (rc)
 911                 return kvm_s390_inject_prog_cond(vcpu, rc);
 912         reg = reg1;
 913         nr_regs = 0;
 914         do {
 915                 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++];
 916                 if (reg == reg3)
 917                         break;
 918                 reg = (reg + 1) % 16;
 919         } while (1);
 920         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
 921         return 0;
 922 }
 923
 924 static int handle_stctg(struct kvm_vcpu *vcpu)
 925 {
 926         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
 927         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
 928         int reg, rc, nr_regs;
 929         u64 ctl_array[16];
 930         u64 ga;
 931         ar_t ar;
 932
 933         vcpu->stat.instruction_stctg++;
 934
 935         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 936                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 937
 938         ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
 939
 940         if (ga & 7)
 941                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 942
 943         VCPU_EVENT(vcpu, 5, "stctg r1:%x, r3:%x, addr:%llx", reg1, reg3, ga);
 944         trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga);
 945
 946         reg = reg1;
 947         nr_regs = 0;
 948         do {
 949                 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
 950                 if (reg == reg3)
 951                         break;
 952                 reg = (reg + 1) % 16;
 953         } while (1);
 954         rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
 955         return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
 956 }
 957
 958 static const intercept_handler_t eb_handlers[256] = {
 959         [0x2f] = handle_lctlg,
 960         [0x25] = handle_stctg,
 961 };
 962
 963 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
 964 {
 965         intercept_handler_t handler;
 966
 967         handler = eb_handlers[vcpu->arch.sie_block->ipb & 0xff];
 968         if (handler)
 969                 return handler(vcpu);
 970         return -EOPNOTSUPP;
 971 }
 972
 973 static int handle_tprot(struct kvm_vcpu *vcpu)
 974 {
 975         u64 address1, address2;
 976         unsigned long hva, gpa;
 977         int ret = 0, cc = 0;
 978         bool writable;
 979         ar_t ar;
 980
 981         vcpu->stat.instruction_tprot++;
 982
 983         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 984                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 985
 986         kvm_s390_get_base_disp_sse(vcpu, &address1, &address2, &ar, NULL);
 987
 988         /* we only handle the Linux memory detection case:
 989          * access key == 0
 990          * everything else goes to userspace. */
 991         if (address2 & 0xf0)
 992                 return -EOPNOTSUPP;
 993         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
 994                 ipte_lock(vcpu);
 995         ret = guest_translate_address(vcpu, address1, ar, &gpa, 1);
 996         if (ret == PGM_PROTECTION) {
 997                 /* Write protected? Try again with read-only... */
 998                 cc = 1;
 999                 ret = guest_translate_address(vcpu, address1, ar, &gpa, 0);
1000         }
1001         if (ret) {
1002                 if (ret == PGM_ADDRESSING || ret == PGM_TRANSLATION_SPEC) {
1003                         ret = kvm_s390_inject_program_int(vcpu, ret);
1004                 } else if (ret > 0) {
1005                         /* Translation not available */
1006                         kvm_s390_set_psw_cc(vcpu, 3);
1007                         ret = 0;
1008                 }
1009                 goto out_unlock;
1010         }
1011
1012         hva = gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable);
1013         if (kvm_is_error_hva(hva)) {
1014                 ret = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1015         } else {
1016                 if (!writable)
1017                         cc = 1;         /* Write not permitted ==> read-only */
1018                 kvm_s390_set_psw_cc(vcpu, cc);
1019                 /* Note: CC2 only occurs for storage keys (not supported yet) */
1020         }
1021 out_unlock:
1022         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1023                 ipte_unlock(vcpu);
1024         return ret;
1025 }
1026
1027 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
1028 {
1029         /* For e5xx... instructions we only handle TPROT */
1030         if ((vcpu->arch.sie_block->ipa & 0x00ff) == 0x01)
1031                 return handle_tprot(vcpu);
1032         return -EOPNOTSUPP;
1033 }
1034
1035 static int handle_sckpf(struct kvm_vcpu *vcpu)
1036 {
1037         u32 value;
1038
1039         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1040                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1041
1042         if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
1043                 return kvm_s390_inject_program_int(vcpu,
1044                                                    PGM_SPECIFICATION);
1045
1046         value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
1047         vcpu->arch.sie_block->todpr = value;
1048
1049         return 0;
1050 }
1051
1052 static const intercept_handler_t x01_handlers[256] = {
1053         [0x07] = handle_sckpf,
1054 };
1055
1056 int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
1057 {
1058         intercept_handler_t handler;
1059
1060         handler = x01_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
1061         if (handler)
1062                 return handler(vcpu);
1063         return -EOPNOTSUPP;
1064 }