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         VCPU_EVENT(vcpu, 3, "SCK: setting guest TOD to 0x%llx", val);
  57         val = (val - hostclk) & ~0x3fUL;
  58
  59         mutex_lock(&vcpu->kvm->lock);
  60         preempt_disable();
  61         kvm_for_each_vcpu(i, cpup, vcpu->kvm)
  62                 cpup->arch.sie_block->epoch = val;
  63         preempt_enable();
  64         mutex_unlock(&vcpu->kvm->lock);
  65
  66         kvm_s390_set_psw_cc(vcpu, 0);
  67         return 0;
  68 }
  69
  70 static int handle_set_prefix(struct kvm_vcpu *vcpu)
  71 {
  72         u64 operand2;
  73         u32 address;
  74         int rc;
  75         ar_t ar;
  76
  77         vcpu->stat.instruction_spx++;
  78
  79         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
  80                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
  81
  82         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
  83
  84         /* must be word boundary */
  85         if (operand2 & 3)
  86                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
  87
  88         /* get the value */
  89         rc = read_guest(vcpu, operand2, ar, &address, sizeof(address));
  90         if (rc)
  91                 return kvm_s390_inject_prog_cond(vcpu, rc);
  92
  93         address &= 0x7fffe000u;
  94
  95         /*
  96          * Make sure the new value is valid memory. We only need to check the
  97          * first page, since address is 8k aligned and memory pieces are always
  98          * at least 1MB aligned and have at least a size of 1MB.
  99          */
 100         if (kvm_is_error_gpa(vcpu->kvm, address))
 101                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 102
 103         kvm_s390_set_prefix(vcpu, address);
 104         trace_kvm_s390_handle_prefix(vcpu, 1, address);
 105         return 0;
 106 }
 107
 108 static int handle_store_prefix(struct kvm_vcpu *vcpu)
 109 {
 110         u64 operand2;
 111         u32 address;
 112         int rc;
 113         ar_t ar;
 114
 115         vcpu->stat.instruction_stpx++;
 116
 117         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 118                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 119
 120         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 121
 122         /* must be word boundary */
 123         if (operand2 & 3)
 124                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 125
 126         address = kvm_s390_get_prefix(vcpu);
 127
 128         /* get the value */
 129         rc = write_guest(vcpu, operand2, ar, &address, sizeof(address));
 130         if (rc)
 131                 return kvm_s390_inject_prog_cond(vcpu, rc);
 132
 133         VCPU_EVENT(vcpu, 3, "STPX: storing prefix 0x%x into 0x%llx", address, operand2);
 134         trace_kvm_s390_handle_prefix(vcpu, 0, address);
 135         return 0;
 136 }
 137
 138 static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
 139 {
 140         u16 vcpu_id = vcpu->vcpu_id;
 141         u64 ga;
 142         int rc;
 143         ar_t ar;
 144
 145         vcpu->stat.instruction_stap++;
 146
 147         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 148                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 149
 150         ga = kvm_s390_get_base_disp_s(vcpu, &ar);
 151
 152         if (ga & 1)
 153                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 154
 155         rc = write_guest(vcpu, ga, ar, &vcpu_id, sizeof(vcpu_id));
 156         if (rc)
 157                 return kvm_s390_inject_prog_cond(vcpu, rc);
 158
 159         VCPU_EVENT(vcpu, 3, "STAP: storing cpu address (%u) to 0x%llx", vcpu_id, ga);
 160         trace_kvm_s390_handle_stap(vcpu, ga);
 161         return 0;
 162 }
 163
 164 static int __skey_check_enable(struct kvm_vcpu *vcpu)
 165 {
 166         int rc = 0;
 167         if (!(vcpu->arch.sie_block->ictl & (ICTL_ISKE | ICTL_SSKE | ICTL_RRBE)))
 168                 return rc;
 169
 170         rc = s390_enable_skey();
 171         VCPU_EVENT(vcpu, 3, "%s", "enabling storage keys for guest");
 172         trace_kvm_s390_skey_related_inst(vcpu);
 173         vcpu->arch.sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | ICTL_RRBE);
 174         return rc;
 175 }
 176
 177
 178 static int handle_skey(struct kvm_vcpu *vcpu)
 179 {
 180         int rc = __skey_check_enable(vcpu);
 181
 182         if (rc)
 183                 return rc;
 184         vcpu->stat.instruction_storage_key++;
 185
 186         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 187                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 188
 189         kvm_s390_rewind_psw(vcpu, 4);
 190         VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
 191         return 0;
 192 }
 193
 194 static int handle_ipte_interlock(struct kvm_vcpu *vcpu)
 195 {
 196         vcpu->stat.instruction_ipte_interlock++;
 197         if (psw_bits(vcpu->arch.sie_block->gpsw).p)
 198                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 199         wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu));
 200         kvm_s390_rewind_psw(vcpu, 4);
 201         VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation");
 202         return 0;
 203 }
 204
 205 static int handle_test_block(struct kvm_vcpu *vcpu)
 206 {
 207         gpa_t addr;
 208         int reg2;
 209
 210         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 211                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 212
 213         kvm_s390_get_regs_rre(vcpu, NULL, &reg2);
 214         addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 215         addr = kvm_s390_logical_to_effective(vcpu, addr);
 216         if (kvm_s390_check_low_addr_prot_real(vcpu, addr))
 217                 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
 218         addr = kvm_s390_real_to_abs(vcpu, addr);
 219
 220         if (kvm_is_error_gpa(vcpu->kvm, addr))
 221                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 222         /*
 223          * We don't expect errors on modern systems, and do not care
 224          * about storage keys (yet), so let's just clear the page.
 225          */
 226         if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE))
 227                 return -EFAULT;
 228         kvm_s390_set_psw_cc(vcpu, 0);
 229         vcpu->run->s.regs.gprs[0] = 0;
 230         return 0;
 231 }
 232
 233 static int handle_tpi(struct kvm_vcpu *vcpu)
 234 {
 235         struct kvm_s390_interrupt_info *inti;
 236         unsigned long len;
 237         u32 tpi_data[3];
 238         int rc;
 239         u64 addr;
 240         ar_t ar;
 241
 242         addr = kvm_s390_get_base_disp_s(vcpu, &ar);
 243         if (addr & 3)
 244                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 245
 246         inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0);
 247         if (!inti) {
 248                 kvm_s390_set_psw_cc(vcpu, 0);
 249                 return 0;
 250         }
 251
 252         tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr;
 253         tpi_data[1] = inti->io.io_int_parm;
 254         tpi_data[2] = inti->io.io_int_word;
 255         if (addr) {
 256                 /*
 257                  * Store the two-word I/O interruption code into the
 258                  * provided area.
 259                  */
 260                 len = sizeof(tpi_data) - 4;
 261                 rc = write_guest(vcpu, addr, ar, &tpi_data, len);
 262                 if (rc) {
 263                         rc = kvm_s390_inject_prog_cond(vcpu, rc);
 264                         goto reinject_interrupt;
 265                 }
 266         } else {
 267                 /*
 268                  * Store the three-word I/O interruption code into
 269                  * the appropriate lowcore area.
 270                  */
 271                 len = sizeof(tpi_data);
 272                 if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) {
 273                         /* failed writes to the low core are not recoverable */
 274                         rc = -EFAULT;
 275                         goto reinject_interrupt;
 276                 }
 277         }
 278
 279         /* irq was successfully handed to the guest */
 280         kfree(inti);
 281         kvm_s390_set_psw_cc(vcpu, 1);
 282         return 0;
 283 reinject_interrupt:
 284         /*
 285          * If we encounter a problem storing the interruption code, the
 286          * instruction is suppressed from the guest's view: reinject the
 287          * interrupt.
 288          */
 289         if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) {
 290                 kfree(inti);
 291                 rc = -EFAULT;
 292         }
 293         /* don't set the cc, a pgm irq was injected or we drop to user space */
 294         return rc ? -EFAULT : 0;
 295 }
 296
 297 static int handle_tsch(struct kvm_vcpu *vcpu)
 298 {
 299         struct kvm_s390_interrupt_info *inti = NULL;
 300         const u64 isc_mask = 0xffUL << 24; /* all iscs set */
 301
 302         /* a valid schid has at least one bit set */
 303         if (vcpu->run->s.regs.gprs[1])
 304                 inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask,
 305                                            vcpu->run->s.regs.gprs[1]);
 306
 307         /*
 308          * Prepare exit to userspace.
 309          * We indicate whether we dequeued a pending I/O interrupt
 310          * so that userspace can re-inject it if the instruction gets
 311          * a program check. While this may re-order the pending I/O
 312          * interrupts, this is no problem since the priority is kept
 313          * intact.
 314          */
 315         vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
 316         vcpu->run->s390_tsch.dequeued = !!inti;
 317         if (inti) {
 318                 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
 319                 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
 320                 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
 321                 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
 322         }
 323         vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
 324         kfree(inti);
 325         return -EREMOTE;
 326 }
 327
 328 static int handle_io_inst(struct kvm_vcpu *vcpu)
 329 {
 330         VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
 331
 332         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 333                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 334
 335         if (vcpu->kvm->arch.css_support) {
 336                 /*
 337                  * Most I/O instructions will be handled by userspace.
 338                  * Exceptions are tpi and the interrupt portion of tsch.
 339                  */
 340                 if (vcpu->arch.sie_block->ipa == 0xb236)
 341                         return handle_tpi(vcpu);
 342                 if (vcpu->arch.sie_block->ipa == 0xb235)
 343                         return handle_tsch(vcpu);
 344                 /* Handle in userspace. */
 345                 return -EOPNOTSUPP;
 346         } else {
 347                 /*
 348                  * Set condition code 3 to stop the guest from issuing channel
 349                  * I/O instructions.
 350                  */
 351                 kvm_s390_set_psw_cc(vcpu, 3);
 352                 return 0;
 353         }
 354 }
 355
 356 static int handle_stfl(struct kvm_vcpu *vcpu)
 357 {
 358         int rc;
 359         unsigned int fac;
 360
 361         vcpu->stat.instruction_stfl++;
 362
 363         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 364                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 365
 366         /*
 367          * We need to shift the lower 32 facility bits (bit 0-31) from a u64
 368          * into a u32 memory representation. They will remain bits 0-31.
 369          */
 370         fac = *vcpu->kvm->arch.model.fac->list >> 32;
 371         rc = write_guest_lc(vcpu, offsetof(struct _lowcore, stfl_fac_list),
 372                             &fac, sizeof(fac));
 373         if (rc)
 374                 return rc;
 375         VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac);
 376         trace_kvm_s390_handle_stfl(vcpu, fac);
 377         return 0;
 378 }
 379
 380 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
 381 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
 382 #define PSW_ADDR_24 0x0000000000ffffffUL
 383 #define PSW_ADDR_31 0x000000007fffffffUL
 384
 385 int is_valid_psw(psw_t *psw)
 386 {
 387         if (psw->mask & PSW_MASK_UNASSIGNED)
 388                 return 0;
 389         if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
 390                 if (psw->addr & ~PSW_ADDR_31)
 391                         return 0;
 392         }
 393         if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
 394                 return 0;
 395         if ((psw->mask & PSW_MASK_ADDR_MODE) ==  PSW_MASK_EA)
 396                 return 0;
 397         if (psw->addr & 1)
 398                 return 0;
 399         return 1;
 400 }
 401
 402 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
 403 {
 404         psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
 405         psw_compat_t new_psw;
 406         u64 addr;
 407         int rc;
 408         ar_t ar;
 409
 410         if (gpsw->mask & PSW_MASK_PSTATE)
 411                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 412
 413         addr = kvm_s390_get_base_disp_s(vcpu, &ar);
 414         if (addr & 7)
 415                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 416
 417         rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
 418         if (rc)
 419                 return kvm_s390_inject_prog_cond(vcpu, rc);
 420         if (!(new_psw.mask & PSW32_MASK_BASE))
 421                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 422         gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
 423         gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
 424         gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
 425         if (!is_valid_psw(gpsw))
 426                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 427         return 0;
 428 }
 429
 430 static int handle_lpswe(struct kvm_vcpu *vcpu)
 431 {
 432         psw_t new_psw;
 433         u64 addr;
 434         int rc;
 435         ar_t ar;
 436
 437         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 438                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 439
 440         addr = kvm_s390_get_base_disp_s(vcpu, &ar);
 441         if (addr & 7)
 442                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 443         rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
 444         if (rc)
 445                 return kvm_s390_inject_prog_cond(vcpu, rc);
 446         vcpu->arch.sie_block->gpsw = new_psw;
 447         if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
 448                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 449         return 0;
 450 }
 451
 452 static int handle_stidp(struct kvm_vcpu *vcpu)
 453 {
 454         u64 stidp_data = vcpu->arch.stidp_data;
 455         u64 operand2;
 456         int rc;
 457         ar_t ar;
 458
 459         vcpu->stat.instruction_stidp++;
 460
 461         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 462                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 463
 464         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 465
 466         if (operand2 & 7)
 467                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 468
 469         rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data));
 470         if (rc)
 471                 return kvm_s390_inject_prog_cond(vcpu, rc);
 472
 473         VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data);
 474         return 0;
 475 }
 476
 477 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
 478 {
 479         int cpus = 0;
 480         int n;
 481
 482         cpus = atomic_read(&vcpu->kvm->online_vcpus);
 483
 484         /* deal with other level 3 hypervisors */
 485         if (stsi(mem, 3, 2, 2))
 486                 mem->count = 0;
 487         if (mem->count < 8)
 488                 mem->count++;
 489         for (n = mem->count - 1; n > 0 ; n--)
 490                 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
 491
 492         memset(&mem->vm[0], 0, sizeof(mem->vm[0]));
 493         mem->vm[0].cpus_total = cpus;
 494         mem->vm[0].cpus_configured = cpus;
 495         mem->vm[0].cpus_standby = 0;
 496         mem->vm[0].cpus_reserved = 0;
 497         mem->vm[0].caf = 1000;
 498         memcpy(mem->vm[0].name, "KVMguest", 8);
 499         ASCEBC(mem->vm[0].name, 8);
 500         memcpy(mem->vm[0].cpi, "KVM/Linux       ", 16);
 501         ASCEBC(mem->vm[0].cpi, 16);
 502 }
 503
 504 static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, ar_t ar,
 505                                  u8 fc, u8 sel1, u16 sel2)
 506 {
 507         vcpu->run->exit_reason = KVM_EXIT_S390_STSI;
 508         vcpu->run->s390_stsi.addr = addr;
 509         vcpu->run->s390_stsi.ar = ar;
 510         vcpu->run->s390_stsi.fc = fc;
 511         vcpu->run->s390_stsi.sel1 = sel1;
 512         vcpu->run->s390_stsi.sel2 = sel2;
 513 }
 514
 515 static int handle_stsi(struct kvm_vcpu *vcpu)
 516 {
 517         int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
 518         int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
 519         int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
 520         unsigned long mem = 0;
 521         u64 operand2;
 522         int rc = 0;
 523         ar_t ar;
 524
 525         vcpu->stat.instruction_stsi++;
 526         VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2);
 527
 528         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 529                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 530
 531         if (fc > 3) {
 532                 kvm_s390_set_psw_cc(vcpu, 3);
 533                 return 0;
 534         }
 535
 536         if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
 537             || vcpu->run->s.regs.gprs[1] & 0xffff0000)
 538                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 539
 540         if (fc == 0) {
 541                 vcpu->run->s.regs.gprs[0] = 3 << 28;
 542                 kvm_s390_set_psw_cc(vcpu, 0);
 543                 return 0;
 544         }
 545
 546         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 547
 548         if (operand2 & 0xfff)
 549                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 550
 551         switch (fc) {
 552         case 1: /* same handling for 1 and 2 */
 553         case 2:
 554                 mem = get_zeroed_page(GFP_KERNEL);
 555                 if (!mem)
 556                         goto out_no_data;
 557                 if (stsi((void *) mem, fc, sel1, sel2))
 558                         goto out_no_data;
 559                 break;
 560         case 3:
 561                 if (sel1 != 2 || sel2 != 2)
 562                         goto out_no_data;
 563                 mem = get_zeroed_page(GFP_KERNEL);
 564                 if (!mem)
 565                         goto out_no_data;
 566                 handle_stsi_3_2_2(vcpu, (void *) mem);
 567                 break;
 568         }
 569
 570         rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE);
 571         if (rc) {
 572                 rc = kvm_s390_inject_prog_cond(vcpu, rc);
 573                 goto out;
 574         }
 575         if (vcpu->kvm->arch.user_stsi) {
 576                 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
 577                 rc = -EREMOTE;
 578         }
 579         trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
 580         free_page(mem);
 581         kvm_s390_set_psw_cc(vcpu, 0);
 582         vcpu->run->s.regs.gprs[0] = 0;
 583         return rc;
 584 out_no_data:
 585         kvm_s390_set_psw_cc(vcpu, 3);
 586 out:
 587         free_page(mem);
 588         return rc;
 589 }
 590
 591 static const intercept_handler_t b2_handlers[256] = {
 592         [0x02] = handle_stidp,
 593         [0x04] = handle_set_clock,
 594         [0x10] = handle_set_prefix,
 595         [0x11] = handle_store_prefix,
 596         [0x12] = handle_store_cpu_address,
 597         [0x21] = handle_ipte_interlock,
 598         [0x29] = handle_skey,
 599         [0x2a] = handle_skey,
 600         [0x2b] = handle_skey,
 601         [0x2c] = handle_test_block,
 602         [0x30] = handle_io_inst,
 603         [0x31] = handle_io_inst,
 604         [0x32] = handle_io_inst,
 605         [0x33] = handle_io_inst,
 606         [0x34] = handle_io_inst,
 607         [0x35] = handle_io_inst,
 608         [0x36] = handle_io_inst,
 609         [0x37] = handle_io_inst,
 610         [0x38] = handle_io_inst,
 611         [0x39] = handle_io_inst,
 612         [0x3a] = handle_io_inst,
 613         [0x3b] = handle_io_inst,
 614         [0x3c] = handle_io_inst,
 615         [0x50] = handle_ipte_interlock,
 616         [0x5f] = handle_io_inst,
 617         [0x74] = handle_io_inst,
 618         [0x76] = handle_io_inst,
 619         [0x7d] = handle_stsi,
 620         [0xb1] = handle_stfl,
 621         [0xb2] = handle_lpswe,
 622 };
 623
 624 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
 625 {
 626         intercept_handler_t handler;
 627
 628         /*
 629          * A lot of B2 instructions are priviledged. Here we check for
 630          * the privileged ones, that we can handle in the kernel.
 631          * Anything else goes to userspace.
 632          */
 633         handler = b2_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
 634         if (handler)
 635                 return handler(vcpu);
 636
 637         return -EOPNOTSUPP;
 638 }
 639
 640 static int handle_epsw(struct kvm_vcpu *vcpu)
 641 {
 642         int reg1, reg2;
 643
 644         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 645
 646         /* This basically extracts the mask half of the psw. */
 647         vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
 648         vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
 649         if (reg2) {
 650                 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
 651                 vcpu->run->s.regs.gprs[reg2] |=
 652                         vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
 653         }
 654         return 0;
 655 }
 656
 657 #define PFMF_RESERVED   0xfffc0101UL
 658 #define PFMF_SK         0x00020000UL
 659 #define PFMF_CF         0x00010000UL
 660 #define PFMF_UI         0x00008000UL
 661 #define PFMF_FSC        0x00007000UL
 662 #define PFMF_NQ         0x00000800UL
 663 #define PFMF_MR         0x00000400UL
 664 #define PFMF_MC         0x00000200UL
 665 #define PFMF_KEY        0x000000feUL
 666
 667 static int handle_pfmf(struct kvm_vcpu *vcpu)
 668 {
 669         int reg1, reg2;
 670         unsigned long start, end;
 671
 672         vcpu->stat.instruction_pfmf++;
 673
 674         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 675
 676         if (!MACHINE_HAS_PFMF)
 677                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
 678
 679         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 680                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 681
 682         if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
 683                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 684
 685         /* Only provide non-quiescing support if the host supports it */
 686         if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ && !test_facility(14))
 687                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 688
 689         /* No support for conditional-SSKE */
 690         if (vcpu->run->s.regs.gprs[reg1] & (PFMF_MR | PFMF_MC))
 691                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 692
 693         start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 694         start = kvm_s390_logical_to_effective(vcpu, start);
 695
 696         switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
 697         case 0x00000000:
 698                 end = (start + (1UL << 12)) & ~((1UL << 12) - 1);
 699                 break;
 700         case 0x00001000:
 701                 end = (start + (1UL << 20)) & ~((1UL << 20) - 1);
 702                 break;
 703         case 0x00002000:
 704                 /* only support 2G frame size if EDAT2 is available and we are
 705                    not in 24-bit addressing mode */
 706                 if (!test_kvm_facility(vcpu->kvm, 78) ||
 707                     psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_AMODE_24BIT)
 708                         return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 709                 end = (start + (1UL << 31)) & ~((1UL << 31) - 1);
 710                 break;
 711         default:
 712                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 713         }
 714
 715         if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
 716                 if (kvm_s390_check_low_addr_prot_real(vcpu, start))
 717                         return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
 718         }
 719
 720         while (start < end) {
 721                 unsigned long useraddr, abs_addr;
 722
 723                 /* Translate guest address to host address */
 724                 if ((vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) == 0)
 725                         abs_addr = kvm_s390_real_to_abs(vcpu, start);
 726                 else
 727                         abs_addr = start;
 728                 useraddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(abs_addr));
 729                 if (kvm_is_error_hva(useraddr))
 730                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 731
 732                 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
 733                         if (clear_user((void __user *)useraddr, PAGE_SIZE))
 734                                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 735                 }
 736
 737                 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
 738                         int rc = __skey_check_enable(vcpu);
 739
 740                         if (rc)
 741                                 return rc;
 742                         if (set_guest_storage_key(current->mm, useraddr,
 743                                         vcpu->run->s.regs.gprs[reg1] & PFMF_KEY,
 744                                         vcpu->run->s.regs.gprs[reg1] & PFMF_NQ))
 745                                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 746                 }
 747
 748                 start += PAGE_SIZE;
 749         }
 750         if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC)
 751                 vcpu->run->s.regs.gprs[reg2] = end;
 752         return 0;
 753 }
 754
 755 static int handle_essa(struct kvm_vcpu *vcpu)
 756 {
 757         /* entries expected to be 1FF */
 758         int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
 759         unsigned long *cbrlo, cbrle;
 760         struct gmap *gmap;
 761         int i;
 762
 763         VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries);
 764         gmap = vcpu->arch.gmap;
 765         vcpu->stat.instruction_essa++;
 766         if (!vcpu->kvm->arch.use_cmma)
 767                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
 768
 769         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 770                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 771
 772         if (((vcpu->arch.sie_block->ipb & 0xf0000000) >> 28) > 6)
 773                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 774
 775         /* Rewind PSW to repeat the ESSA instruction */
 776         kvm_s390_rewind_psw(vcpu, 4);
 777         vcpu->arch.sie_block->cbrlo &= PAGE_MASK;       /* reset nceo */
 778         cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
 779         down_read(&gmap->mm->mmap_sem);
 780         for (i = 0; i < entries; ++i) {
 781                 cbrle = cbrlo[i];
 782                 if (unlikely(cbrle & ~PAGE_MASK || cbrle < 2 * PAGE_SIZE))
 783                         /* invalid entry */
 784                         break;
 785                 /* try to free backing */
 786                 __gmap_zap(gmap, cbrle);
 787         }
 788         up_read(&gmap->mm->mmap_sem);
 789         if (i < entries)
 790                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 791         return 0;
 792 }
 793
 794 static const intercept_handler_t b9_handlers[256] = {
 795         [0x8a] = handle_ipte_interlock,
 796         [0x8d] = handle_epsw,
 797         [0x8e] = handle_ipte_interlock,
 798         [0x8f] = handle_ipte_interlock,
 799         [0xab] = handle_essa,
 800         [0xaf] = handle_pfmf,
 801 };
 802
 803 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
 804 {
 805         intercept_handler_t handler;
 806
 807         /* This is handled just as for the B2 instructions. */
 808         handler = b9_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
 809         if (handler)
 810                 return handler(vcpu);
 811
 812         return -EOPNOTSUPP;
 813 }
 814
 815 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
 816 {
 817         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
 818         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
 819         int reg, rc, nr_regs;
 820         u32 ctl_array[16];
 821         u64 ga;
 822         ar_t ar;
 823
 824         vcpu->stat.instruction_lctl++;
 825
 826         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 827                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 828
 829         ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
 830
 831         if (ga & 3)
 832                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 833
 834         VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
 835         trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga);
 836
 837         nr_regs = ((reg3 - reg1) & 0xf) + 1;
 838         rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
 839         if (rc)
 840                 return kvm_s390_inject_prog_cond(vcpu, rc);
 841         reg = reg1;
 842         nr_regs = 0;
 843         do {
 844                 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
 845                 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++];
 846                 if (reg == reg3)
 847                         break;
 848                 reg = (reg + 1) % 16;
 849         } while (1);
 850         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
 851         return 0;
 852 }
 853
 854 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu)
 855 {
 856         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
 857         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
 858         int reg, rc, nr_regs;
 859         u32 ctl_array[16];
 860         u64 ga;
 861         ar_t ar;
 862
 863         vcpu->stat.instruction_stctl++;
 864
 865         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 866                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 867
 868         ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
 869
 870         if (ga & 3)
 871                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 872
 873         VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
 874         trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga);
 875
 876         reg = reg1;
 877         nr_regs = 0;
 878         do {
 879                 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
 880                 if (reg == reg3)
 881                         break;
 882                 reg = (reg + 1) % 16;
 883         } while (1);
 884         rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
 885         return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
 886 }
 887
 888 static int handle_lctlg(struct kvm_vcpu *vcpu)
 889 {
 890         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
 891         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
 892         int reg, rc, nr_regs;
 893         u64 ctl_array[16];
 894         u64 ga;
 895         ar_t ar;
 896
 897         vcpu->stat.instruction_lctlg++;
 898
 899         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 900                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 901
 902         ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
 903
 904         if (ga & 7)
 905                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 906
 907         VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
 908         trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga);
 909
 910         nr_regs = ((reg3 - reg1) & 0xf) + 1;
 911         rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
 912         if (rc)
 913                 return kvm_s390_inject_prog_cond(vcpu, rc);
 914         reg = reg1;
 915         nr_regs = 0;
 916         do {
 917                 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++];
 918                 if (reg == reg3)
 919                         break;
 920                 reg = (reg + 1) % 16;
 921         } while (1);
 922         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
 923         return 0;
 924 }
 925
 926 static int handle_stctg(struct kvm_vcpu *vcpu)
 927 {
 928         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
 929         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
 930         int reg, rc, nr_regs;
 931         u64 ctl_array[16];
 932         u64 ga;
 933         ar_t ar;
 934
 935         vcpu->stat.instruction_stctg++;
 936
 937         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 938                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 939
 940         ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
 941
 942         if (ga & 7)
 943                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 944
 945         VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
 946         trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga);
 947
 948         reg = reg1;
 949         nr_regs = 0;
 950         do {
 951                 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
 952                 if (reg == reg3)
 953                         break;
 954                 reg = (reg + 1) % 16;
 955         } while (1);
 956         rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
 957         return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
 958 }
 959
 960 static const intercept_handler_t eb_handlers[256] = {
 961         [0x2f] = handle_lctlg,
 962         [0x25] = handle_stctg,
 963 };
 964
 965 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
 966 {
 967         intercept_handler_t handler;
 968
 969         handler = eb_handlers[vcpu->arch.sie_block->ipb & 0xff];
 970         if (handler)
 971                 return handler(vcpu);
 972         return -EOPNOTSUPP;
 973 }
 974
 975 static int handle_tprot(struct kvm_vcpu *vcpu)
 976 {
 977         u64 address1, address2;
 978         unsigned long hva, gpa;
 979         int ret = 0, cc = 0;
 980         bool writable;
 981         ar_t ar;
 982
 983         vcpu->stat.instruction_tprot++;
 984
 985         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 986                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 987
 988         kvm_s390_get_base_disp_sse(vcpu, &address1, &address2, &ar, NULL);
 989
 990         /* we only handle the Linux memory detection case:
 991          * access key == 0
 992          * everything else goes to userspace. */
 993         if (address2 & 0xf0)
 994                 return -EOPNOTSUPP;
 995         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
 996                 ipte_lock(vcpu);
 997         ret = guest_translate_address(vcpu, address1, ar, &gpa, 1);
 998         if (ret == PGM_PROTECTION) {
 999                 /* Write protected? Try again with read-only... */
1000                 cc = 1;
1001                 ret = guest_translate_address(vcpu, address1, ar, &gpa, 0);
1002         }
1003         if (ret) {
1004                 if (ret == PGM_ADDRESSING || ret == PGM_TRANSLATION_SPEC) {
1005                         ret = kvm_s390_inject_program_int(vcpu, ret);
1006                 } else if (ret > 0) {
1007                         /* Translation not available */
1008                         kvm_s390_set_psw_cc(vcpu, 3);
1009                         ret = 0;
1010                 }
1011                 goto out_unlock;
1012         }
1013
1014         hva = gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable);
1015         if (kvm_is_error_hva(hva)) {
1016                 ret = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1017         } else {
1018                 if (!writable)
1019                         cc = 1;         /* Write not permitted ==> read-only */
1020                 kvm_s390_set_psw_cc(vcpu, cc);
1021                 /* Note: CC2 only occurs for storage keys (not supported yet) */
1022         }
1023 out_unlock:
1024         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1025                 ipte_unlock(vcpu);
1026         return ret;
1027 }
1028
1029 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
1030 {
1031         /* For e5xx... instructions we only handle TPROT */
1032         if ((vcpu->arch.sie_block->ipa & 0x00ff) == 0x01)
1033                 return handle_tprot(vcpu);
1034         return -EOPNOTSUPP;
1035 }
1036
1037 static int handle_sckpf(struct kvm_vcpu *vcpu)
1038 {
1039         u32 value;
1040
1041         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1042                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1043
1044         if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
1045                 return kvm_s390_inject_program_int(vcpu,
1046                                                    PGM_SPECIFICATION);
1047
1048         value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
1049         vcpu->arch.sie_block->todpr = value;
1050
1051         return 0;
1052 }
1053
1054 static const intercept_handler_t x01_handlers[256] = {
1055         [0x07] = handle_sckpf,
1056 };
1057
1058 int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
1059 {
1060         intercept_handler_t handler;
1061
1062         handler = x01_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
1063         if (handler)
1064                 return handler(vcpu);
1065         return -EOPNOTSUPP;
1066 }