arch/s390/kvm/priv.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * handling privileged instructions
   4  *
   5  * Copyright IBM Corp. 2008, 2013
   6  *
   7  *    Author(s): Carsten Otte <[email protected]>
   8  *               Christian Borntraeger <[email protected]>
   9  */
  10
  11 #include <linux/kvm.h>
  12 #include <linux/gfp.h>
  13 #include <linux/errno.h>
  14 #include <linux/compat.h>
  15 #include <linux/mm_types.h>
  16
  17 #include <asm/asm-offsets.h>
  18 #include <asm/facility.h>
  19 #include <asm/current.h>
  20 #include <asm/debug.h>
  21 #include <asm/ebcdic.h>
  22 #include <asm/sysinfo.h>
  23 #include <asm/pgtable.h>
  24 #include <asm/page-states.h>
  25 #include <asm/pgalloc.h>
  26 #include <asm/gmap.h>
  27 #include <asm/io.h>
  28 #include <asm/ptrace.h>
  29 #include <asm/compat.h>
  30 #include <asm/sclp.h>
  31 #include "gaccess.h"
  32 #include "kvm-s390.h"
  33 #include "trace.h"
  34
  35 static int handle_ri(struct kvm_vcpu *vcpu)
  36 {
  37         if (test_kvm_facility(vcpu->kvm, 64)) {
  38                 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (lazy)");
  39                 vcpu->arch.sie_block->ecb3 |= ECB3_RI;
  40                 kvm_s390_retry_instr(vcpu);
  41                 return 0;
  42         } else
  43                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
  44 }
  45
  46 int kvm_s390_handle_aa(struct kvm_vcpu *vcpu)
  47 {
  48         if ((vcpu->arch.sie_block->ipa & 0xf) <= 4)
  49                 return handle_ri(vcpu);
  50         else
  51                 return -EOPNOTSUPP;
  52 }
  53
  54 static int handle_gs(struct kvm_vcpu *vcpu)
  55 {
  56         if (test_kvm_facility(vcpu->kvm, 133)) {
  57                 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (lazy)");
  58                 preempt_disable();
  59                 __ctl_set_bit(2, 4);
  60                 current->thread.gs_cb = (struct gs_cb *)&vcpu->run->s.regs.gscb;
  61                 restore_gs_cb(current->thread.gs_cb);
  62                 preempt_enable();
  63                 vcpu->arch.sie_block->ecb |= ECB_GS;
  64                 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
  65                 vcpu->arch.gs_enabled = 1;
  66                 kvm_s390_retry_instr(vcpu);
  67                 return 0;
  68         } else
  69                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
  70 }
  71
  72 int kvm_s390_handle_e3(struct kvm_vcpu *vcpu)
  73 {
  74         int code = vcpu->arch.sie_block->ipb & 0xff;
  75
  76         if (code == 0x49 || code == 0x4d)
  77                 return handle_gs(vcpu);
  78         else
  79                 return -EOPNOTSUPP;
  80 }
  81 /* Handle SCK (SET CLOCK) interception */
  82 static int handle_set_clock(struct kvm_vcpu *vcpu)
  83 {
  84         int rc;
  85         u8 ar;
  86         u64 op2, val;
  87
  88         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
  89                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
  90
  91         op2 = kvm_s390_get_base_disp_s(vcpu, &ar);
  92         if (op2 & 7)    /* Operand must be on a doubleword boundary */
  93                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
  94         rc = read_guest(vcpu, op2, ar, &val, sizeof(val));
  95         if (rc)
  96                 return kvm_s390_inject_prog_cond(vcpu, rc);
  97
  98         VCPU_EVENT(vcpu, 3, "SCK: setting guest TOD to 0x%llx", val);
  99         kvm_s390_set_tod_clock(vcpu->kvm, val);
 100
 101         kvm_s390_set_psw_cc(vcpu, 0);
 102         return 0;
 103 }
 104
 105 static int handle_set_prefix(struct kvm_vcpu *vcpu)
 106 {
 107         u64 operand2;
 108         u32 address;
 109         int rc;
 110         u8 ar;
 111
 112         vcpu->stat.instruction_spx++;
 113
 114         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 115                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 116
 117         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 118
 119         /* must be word boundary */
 120         if (operand2 & 3)
 121                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 122
 123         /* get the value */
 124         rc = read_guest(vcpu, operand2, ar, &address, sizeof(address));
 125         if (rc)
 126                 return kvm_s390_inject_prog_cond(vcpu, rc);
 127
 128         address &= 0x7fffe000u;
 129
 130         /*
 131          * Make sure the new value is valid memory. We only need to check the
 132          * first page, since address is 8k aligned and memory pieces are always
 133          * at least 1MB aligned and have at least a size of 1MB.
 134          */
 135         if (kvm_is_error_gpa(vcpu->kvm, address))
 136                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 137
 138         kvm_s390_set_prefix(vcpu, address);
 139         trace_kvm_s390_handle_prefix(vcpu, 1, address);
 140         return 0;
 141 }
 142
 143 static int handle_store_prefix(struct kvm_vcpu *vcpu)
 144 {
 145         u64 operand2;
 146         u32 address;
 147         int rc;
 148         u8 ar;
 149
 150         vcpu->stat.instruction_stpx++;
 151
 152         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 153                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 154
 155         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 156
 157         /* must be word boundary */
 158         if (operand2 & 3)
 159                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 160
 161         address = kvm_s390_get_prefix(vcpu);
 162
 163         /* get the value */
 164         rc = write_guest(vcpu, operand2, ar, &address, sizeof(address));
 165         if (rc)
 166                 return kvm_s390_inject_prog_cond(vcpu, rc);
 167
 168         VCPU_EVENT(vcpu, 3, "STPX: storing prefix 0x%x into 0x%llx", address, operand2);
 169         trace_kvm_s390_handle_prefix(vcpu, 0, address);
 170         return 0;
 171 }
 172
 173 static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
 174 {
 175         u16 vcpu_id = vcpu->vcpu_id;
 176         u64 ga;
 177         int rc;
 178         u8 ar;
 179
 180         vcpu->stat.instruction_stap++;
 181
 182         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 183                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 184
 185         ga = kvm_s390_get_base_disp_s(vcpu, &ar);
 186
 187         if (ga & 1)
 188                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 189
 190         rc = write_guest(vcpu, ga, ar, &vcpu_id, sizeof(vcpu_id));
 191         if (rc)
 192                 return kvm_s390_inject_prog_cond(vcpu, rc);
 193
 194         VCPU_EVENT(vcpu, 3, "STAP: storing cpu address (%u) to 0x%llx", vcpu_id, ga);
 195         trace_kvm_s390_handle_stap(vcpu, ga);
 196         return 0;
 197 }
 198
 199 int kvm_s390_skey_check_enable(struct kvm_vcpu *vcpu)
 200 {
 201         int rc = 0;
 202         struct kvm_s390_sie_block *sie_block = vcpu->arch.sie_block;
 203
 204         trace_kvm_s390_skey_related_inst(vcpu);
 205         if (!(sie_block->ictl & (ICTL_ISKE | ICTL_SSKE | ICTL_RRBE)) &&
 206             !(atomic_read(&sie_block->cpuflags) & CPUSTAT_KSS))
 207                 return rc;
 208
 209         rc = s390_enable_skey();
 210         VCPU_EVENT(vcpu, 3, "enabling storage keys for guest: %d", rc);
 211         if (!rc) {
 212                 if (atomic_read(&sie_block->cpuflags) & CPUSTAT_KSS)
 213                         atomic_andnot(CPUSTAT_KSS, &sie_block->cpuflags);
 214                 else
 215                         sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE |
 216                                              ICTL_RRBE);
 217         }
 218         return rc;
 219 }
 220
 221 static int try_handle_skey(struct kvm_vcpu *vcpu)
 222 {
 223         int rc;
 224
 225         vcpu->stat.instruction_storage_key++;
 226         rc = kvm_s390_skey_check_enable(vcpu);
 227         if (rc)
 228                 return rc;
 229         if (sclp.has_skey) {
 230                 /* with storage-key facility, SIE interprets it for us */
 231                 kvm_s390_retry_instr(vcpu);
 232                 VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
 233                 return -EAGAIN;
 234         }
 235         return 0;
 236 }
 237
 238 static int handle_iske(struct kvm_vcpu *vcpu)
 239 {
 240         unsigned long addr;
 241         unsigned char key;
 242         int reg1, reg2;
 243         int rc;
 244
 245         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 246                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 247
 248         rc = try_handle_skey(vcpu);
 249         if (rc)
 250                 return rc != -EAGAIN ? rc : 0;
 251
 252         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 253
 254         addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 255         addr = kvm_s390_logical_to_effective(vcpu, addr);
 256         addr = kvm_s390_real_to_abs(vcpu, addr);
 257         addr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(addr));
 258         if (kvm_is_error_hva(addr))
 259                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 260
 261         down_read(&current->mm->mmap_sem);
 262         rc = get_guest_storage_key(current->mm, addr, &key);
 263         up_read(&current->mm->mmap_sem);
 264         if (rc)
 265                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 266         vcpu->run->s.regs.gprs[reg1] &= ~0xff;
 267         vcpu->run->s.regs.gprs[reg1] |= key;
 268         return 0;
 269 }
 270
 271 static int handle_rrbe(struct kvm_vcpu *vcpu)
 272 {
 273         unsigned long addr;
 274         int reg1, reg2;
 275         int rc;
 276
 277         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 278                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 279
 280         rc = try_handle_skey(vcpu);
 281         if (rc)
 282                 return rc != -EAGAIN ? rc : 0;
 283
 284         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 285
 286         addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 287         addr = kvm_s390_logical_to_effective(vcpu, addr);
 288         addr = kvm_s390_real_to_abs(vcpu, addr);
 289         addr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(addr));
 290         if (kvm_is_error_hva(addr))
 291                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 292
 293         down_read(&current->mm->mmap_sem);
 294         rc = reset_guest_reference_bit(current->mm, addr);
 295         up_read(&current->mm->mmap_sem);
 296         if (rc < 0)
 297                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 298
 299         kvm_s390_set_psw_cc(vcpu, rc);
 300         return 0;
 301 }
 302
 303 #define SSKE_NQ 0x8
 304 #define SSKE_MR 0x4
 305 #define SSKE_MC 0x2
 306 #define SSKE_MB 0x1
 307 static int handle_sske(struct kvm_vcpu *vcpu)
 308 {
 309         unsigned char m3 = vcpu->arch.sie_block->ipb >> 28;
 310         unsigned long start, end;
 311         unsigned char key, oldkey;
 312         int reg1, reg2;
 313         int rc;
 314
 315         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 316                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 317
 318         rc = try_handle_skey(vcpu);
 319         if (rc)
 320                 return rc != -EAGAIN ? rc : 0;
 321
 322         if (!test_kvm_facility(vcpu->kvm, 8))
 323                 m3 &= ~SSKE_MB;
 324         if (!test_kvm_facility(vcpu->kvm, 10))
 325                 m3 &= ~(SSKE_MC | SSKE_MR);
 326         if (!test_kvm_facility(vcpu->kvm, 14))
 327                 m3 &= ~SSKE_NQ;
 328
 329         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 330
 331         key = vcpu->run->s.regs.gprs[reg1] & 0xfe;
 332         start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 333         start = kvm_s390_logical_to_effective(vcpu, start);
 334         if (m3 & SSKE_MB) {
 335                 /* start already designates an absolute address */
 336                 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
 337         } else {
 338                 start = kvm_s390_real_to_abs(vcpu, start);
 339                 end = start + PAGE_SIZE;
 340         }
 341
 342         while (start != end) {
 343                 unsigned long addr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
 344
 345                 if (kvm_is_error_hva(addr))
 346                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 347
 348                 down_read(&current->mm->mmap_sem);
 349                 rc = cond_set_guest_storage_key(current->mm, addr, key, &oldkey,
 350                                                 m3 & SSKE_NQ, m3 & SSKE_MR,
 351                                                 m3 & SSKE_MC);
 352                 up_read(&current->mm->mmap_sem);
 353                 if (rc < 0)
 354                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 355                 start += PAGE_SIZE;
 356         }
 357
 358         if (m3 & (SSKE_MC | SSKE_MR)) {
 359                 if (m3 & SSKE_MB) {
 360                         /* skey in reg1 is unpredictable */
 361                         kvm_s390_set_psw_cc(vcpu, 3);
 362                 } else {
 363                         kvm_s390_set_psw_cc(vcpu, rc);
 364                         vcpu->run->s.regs.gprs[reg1] &= ~0xff00UL;
 365                         vcpu->run->s.regs.gprs[reg1] |= (u64) oldkey << 8;
 366                 }
 367         }
 368         if (m3 & SSKE_MB) {
 369                 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT)
 370                         vcpu->run->s.regs.gprs[reg2] &= ~PAGE_MASK;
 371                 else
 372                         vcpu->run->s.regs.gprs[reg2] &= ~0xfffff000UL;
 373                 end = kvm_s390_logical_to_effective(vcpu, end);
 374                 vcpu->run->s.regs.gprs[reg2] |= end;
 375         }
 376         return 0;
 377 }
 378
 379 static int handle_ipte_interlock(struct kvm_vcpu *vcpu)
 380 {
 381         vcpu->stat.instruction_ipte_interlock++;
 382         if (psw_bits(vcpu->arch.sie_block->gpsw).pstate)
 383                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 384         wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu));
 385         kvm_s390_retry_instr(vcpu);
 386         VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation");
 387         return 0;
 388 }
 389
 390 static int handle_test_block(struct kvm_vcpu *vcpu)
 391 {
 392         gpa_t addr;
 393         int reg2;
 394
 395         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 396                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 397
 398         kvm_s390_get_regs_rre(vcpu, NULL, &reg2);
 399         addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 400         addr = kvm_s390_logical_to_effective(vcpu, addr);
 401         if (kvm_s390_check_low_addr_prot_real(vcpu, addr))
 402                 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
 403         addr = kvm_s390_real_to_abs(vcpu, addr);
 404
 405         if (kvm_is_error_gpa(vcpu->kvm, addr))
 406                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 407         /*
 408          * We don't expect errors on modern systems, and do not care
 409          * about storage keys (yet), so let's just clear the page.
 410          */
 411         if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE))
 412                 return -EFAULT;
 413         kvm_s390_set_psw_cc(vcpu, 0);
 414         vcpu->run->s.regs.gprs[0] = 0;
 415         return 0;
 416 }
 417
 418 static int handle_tpi(struct kvm_vcpu *vcpu)
 419 {
 420         struct kvm_s390_interrupt_info *inti;
 421         unsigned long len;
 422         u32 tpi_data[3];
 423         int rc;
 424         u64 addr;
 425         u8 ar;
 426
 427         addr = kvm_s390_get_base_disp_s(vcpu, &ar);
 428         if (addr & 3)
 429                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 430
 431         inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0);
 432         if (!inti) {
 433                 kvm_s390_set_psw_cc(vcpu, 0);
 434                 return 0;
 435         }
 436
 437         tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr;
 438         tpi_data[1] = inti->io.io_int_parm;
 439         tpi_data[2] = inti->io.io_int_word;
 440         if (addr) {
 441                 /*
 442                  * Store the two-word I/O interruption code into the
 443                  * provided area.
 444                  */
 445                 len = sizeof(tpi_data) - 4;
 446                 rc = write_guest(vcpu, addr, ar, &tpi_data, len);
 447                 if (rc) {
 448                         rc = kvm_s390_inject_prog_cond(vcpu, rc);
 449                         goto reinject_interrupt;
 450                 }
 451         } else {
 452                 /*
 453                  * Store the three-word I/O interruption code into
 454                  * the appropriate lowcore area.
 455                  */
 456                 len = sizeof(tpi_data);
 457                 if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) {
 458                         /* failed writes to the low core are not recoverable */
 459                         rc = -EFAULT;
 460                         goto reinject_interrupt;
 461                 }
 462         }
 463
 464         /* irq was successfully handed to the guest */
 465         kfree(inti);
 466         kvm_s390_set_psw_cc(vcpu, 1);
 467         return 0;
 468 reinject_interrupt:
 469         /*
 470          * If we encounter a problem storing the interruption code, the
 471          * instruction is suppressed from the guest's view: reinject the
 472          * interrupt.
 473          */
 474         if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) {
 475                 kfree(inti);
 476                 rc = -EFAULT;
 477         }
 478         /* don't set the cc, a pgm irq was injected or we drop to user space */
 479         return rc ? -EFAULT : 0;
 480 }
 481
 482 static int handle_tsch(struct kvm_vcpu *vcpu)
 483 {
 484         struct kvm_s390_interrupt_info *inti = NULL;
 485         const u64 isc_mask = 0xffUL << 24; /* all iscs set */
 486
 487         /* a valid schid has at least one bit set */
 488         if (vcpu->run->s.regs.gprs[1])
 489                 inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask,
 490                                            vcpu->run->s.regs.gprs[1]);
 491
 492         /*
 493          * Prepare exit to userspace.
 494          * We indicate whether we dequeued a pending I/O interrupt
 495          * so that userspace can re-inject it if the instruction gets
 496          * a program check. While this may re-order the pending I/O
 497          * interrupts, this is no problem since the priority is kept
 498          * intact.
 499          */
 500         vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
 501         vcpu->run->s390_tsch.dequeued = !!inti;
 502         if (inti) {
 503                 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
 504                 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
 505                 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
 506                 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
 507         }
 508         vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
 509         kfree(inti);
 510         return -EREMOTE;
 511 }
 512
 513 static int handle_io_inst(struct kvm_vcpu *vcpu)
 514 {
 515         VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
 516
 517         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 518                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 519
 520         if (vcpu->kvm->arch.css_support) {
 521                 /*
 522                  * Most I/O instructions will be handled by userspace.
 523                  * Exceptions are tpi and the interrupt portion of tsch.
 524                  */
 525                 if (vcpu->arch.sie_block->ipa == 0xb236)
 526                         return handle_tpi(vcpu);
 527                 if (vcpu->arch.sie_block->ipa == 0xb235)
 528                         return handle_tsch(vcpu);
 529                 /* Handle in userspace. */
 530                 return -EOPNOTSUPP;
 531         } else {
 532                 /*
 533                  * Set condition code 3 to stop the guest from issuing channel
 534                  * I/O instructions.
 535                  */
 536                 kvm_s390_set_psw_cc(vcpu, 3);
 537                 return 0;
 538         }
 539 }
 540
 541 static int handle_stfl(struct kvm_vcpu *vcpu)
 542 {
 543         int rc;
 544         unsigned int fac;
 545
 546         vcpu->stat.instruction_stfl++;
 547
 548         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 549                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 550
 551         /*
 552          * We need to shift the lower 32 facility bits (bit 0-31) from a u64
 553          * into a u32 memory representation. They will remain bits 0-31.
 554          */
 555         fac = *vcpu->kvm->arch.model.fac_list >> 32;
 556         rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list),
 557                             &fac, sizeof(fac));
 558         if (rc)
 559                 return rc;
 560         VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac);
 561         trace_kvm_s390_handle_stfl(vcpu, fac);
 562         return 0;
 563 }
 564
 565 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
 566 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
 567 #define PSW_ADDR_24 0x0000000000ffffffUL
 568 #define PSW_ADDR_31 0x000000007fffffffUL
 569
 570 int is_valid_psw(psw_t *psw)
 571 {
 572         if (psw->mask & PSW_MASK_UNASSIGNED)
 573                 return 0;
 574         if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
 575                 if (psw->addr & ~PSW_ADDR_31)
 576                         return 0;
 577         }
 578         if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
 579                 return 0;
 580         if ((psw->mask & PSW_MASK_ADDR_MODE) ==  PSW_MASK_EA)
 581                 return 0;
 582         if (psw->addr & 1)
 583                 return 0;
 584         return 1;
 585 }
 586
 587 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
 588 {
 589         psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
 590         psw_compat_t new_psw;
 591         u64 addr;
 592         int rc;
 593         u8 ar;
 594
 595         if (gpsw->mask & PSW_MASK_PSTATE)
 596                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 597
 598         addr = kvm_s390_get_base_disp_s(vcpu, &ar);
 599         if (addr & 7)
 600                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 601
 602         rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
 603         if (rc)
 604                 return kvm_s390_inject_prog_cond(vcpu, rc);
 605         if (!(new_psw.mask & PSW32_MASK_BASE))
 606                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 607         gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
 608         gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
 609         gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
 610         if (!is_valid_psw(gpsw))
 611                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 612         return 0;
 613 }
 614
 615 static int handle_lpswe(struct kvm_vcpu *vcpu)
 616 {
 617         psw_t new_psw;
 618         u64 addr;
 619         int rc;
 620         u8 ar;
 621
 622         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 623                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 624
 625         addr = kvm_s390_get_base_disp_s(vcpu, &ar);
 626         if (addr & 7)
 627                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 628         rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
 629         if (rc)
 630                 return kvm_s390_inject_prog_cond(vcpu, rc);
 631         vcpu->arch.sie_block->gpsw = new_psw;
 632         if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
 633                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 634         return 0;
 635 }
 636
 637 static int handle_stidp(struct kvm_vcpu *vcpu)
 638 {
 639         u64 stidp_data = vcpu->kvm->arch.model.cpuid;
 640         u64 operand2;
 641         int rc;
 642         u8 ar;
 643
 644         vcpu->stat.instruction_stidp++;
 645
 646         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 647                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 648
 649         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 650
 651         if (operand2 & 7)
 652                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 653
 654         rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data));
 655         if (rc)
 656                 return kvm_s390_inject_prog_cond(vcpu, rc);
 657
 658         VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data);
 659         return 0;
 660 }
 661
 662 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
 663 {
 664         int cpus = 0;
 665         int n;
 666
 667         cpus = atomic_read(&vcpu->kvm->online_vcpus);
 668
 669         /* deal with other level 3 hypervisors */
 670         if (stsi(mem, 3, 2, 2))
 671                 mem->count = 0;
 672         if (mem->count < 8)
 673                 mem->count++;
 674         for (n = mem->count - 1; n > 0 ; n--)
 675                 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
 676
 677         memset(&mem->vm[0], 0, sizeof(mem->vm[0]));
 678         mem->vm[0].cpus_total = cpus;
 679         mem->vm[0].cpus_configured = cpus;
 680         mem->vm[0].cpus_standby = 0;
 681         mem->vm[0].cpus_reserved = 0;
 682         mem->vm[0].caf = 1000;
 683         memcpy(mem->vm[0].name, "KVMguest", 8);
 684         ASCEBC(mem->vm[0].name, 8);
 685         memcpy(mem->vm[0].cpi, "KVM/Linux       ", 16);
 686         ASCEBC(mem->vm[0].cpi, 16);
 687 }
 688
 689 static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, u8 ar,
 690                                  u8 fc, u8 sel1, u16 sel2)
 691 {
 692         vcpu->run->exit_reason = KVM_EXIT_S390_STSI;
 693         vcpu->run->s390_stsi.addr = addr;
 694         vcpu->run->s390_stsi.ar = ar;
 695         vcpu->run->s390_stsi.fc = fc;
 696         vcpu->run->s390_stsi.sel1 = sel1;
 697         vcpu->run->s390_stsi.sel2 = sel2;
 698 }
 699
 700 static int handle_stsi(struct kvm_vcpu *vcpu)
 701 {
 702         int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
 703         int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
 704         int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
 705         unsigned long mem = 0;
 706         u64 operand2;
 707         int rc = 0;
 708         u8 ar;
 709
 710         vcpu->stat.instruction_stsi++;
 711         VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2);
 712
 713         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 714                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 715
 716         if (fc > 3) {
 717                 kvm_s390_set_psw_cc(vcpu, 3);
 718                 return 0;
 719         }
 720
 721         if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
 722             || vcpu->run->s.regs.gprs[1] & 0xffff0000)
 723                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 724
 725         if (fc == 0) {
 726                 vcpu->run->s.regs.gprs[0] = 3 << 28;
 727                 kvm_s390_set_psw_cc(vcpu, 0);
 728                 return 0;
 729         }
 730
 731         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 732
 733         if (operand2 & 0xfff)
 734                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 735
 736         switch (fc) {
 737         case 1: /* same handling for 1 and 2 */
 738         case 2:
 739                 mem = get_zeroed_page(GFP_KERNEL);
 740                 if (!mem)
 741                         goto out_no_data;
 742                 if (stsi((void *) mem, fc, sel1, sel2))
 743                         goto out_no_data;
 744                 break;
 745         case 3:
 746                 if (sel1 != 2 || sel2 != 2)
 747                         goto out_no_data;
 748                 mem = get_zeroed_page(GFP_KERNEL);
 749                 if (!mem)
 750                         goto out_no_data;
 751                 handle_stsi_3_2_2(vcpu, (void *) mem);
 752                 break;
 753         }
 754
 755         rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE);
 756         if (rc) {
 757                 rc = kvm_s390_inject_prog_cond(vcpu, rc);
 758                 goto out;
 759         }
 760         if (vcpu->kvm->arch.user_stsi) {
 761                 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
 762                 rc = -EREMOTE;
 763         }
 764         trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
 765         free_page(mem);
 766         kvm_s390_set_psw_cc(vcpu, 0);
 767         vcpu->run->s.regs.gprs[0] = 0;
 768         return rc;
 769 out_no_data:
 770         kvm_s390_set_psw_cc(vcpu, 3);
 771 out:
 772         free_page(mem);
 773         return rc;
 774 }
 775
 776 static const intercept_handler_t b2_handlers[256] = {
 777         [0x02] = handle_stidp,
 778         [0x04] = handle_set_clock,
 779         [0x10] = handle_set_prefix,
 780         [0x11] = handle_store_prefix,
 781         [0x12] = handle_store_cpu_address,
 782         [0x14] = kvm_s390_handle_vsie,
 783         [0x21] = handle_ipte_interlock,
 784         [0x29] = handle_iske,
 785         [0x2a] = handle_rrbe,
 786         [0x2b] = handle_sske,
 787         [0x2c] = handle_test_block,
 788         [0x30] = handle_io_inst,
 789         [0x31] = handle_io_inst,
 790         [0x32] = handle_io_inst,
 791         [0x33] = handle_io_inst,
 792         [0x34] = handle_io_inst,
 793         [0x35] = handle_io_inst,
 794         [0x36] = handle_io_inst,
 795         [0x37] = handle_io_inst,
 796         [0x38] = handle_io_inst,
 797         [0x39] = handle_io_inst,
 798         [0x3a] = handle_io_inst,
 799         [0x3b] = handle_io_inst,
 800         [0x3c] = handle_io_inst,
 801         [0x50] = handle_ipte_interlock,
 802         [0x56] = handle_sthyi,
 803         [0x5f] = handle_io_inst,
 804         [0x74] = handle_io_inst,
 805         [0x76] = handle_io_inst,
 806         [0x7d] = handle_stsi,
 807         [0xb1] = handle_stfl,
 808         [0xb2] = handle_lpswe,
 809 };
 810
 811 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
 812 {
 813         intercept_handler_t handler;
 814
 815         /*
 816          * A lot of B2 instructions are priviledged. Here we check for
 817          * the privileged ones, that we can handle in the kernel.
 818          * Anything else goes to userspace.
 819          */
 820         handler = b2_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
 821         if (handler)
 822                 return handler(vcpu);
 823
 824         return -EOPNOTSUPP;
 825 }
 826
 827 static int handle_epsw(struct kvm_vcpu *vcpu)
 828 {
 829         int reg1, reg2;
 830
 831         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 832
 833         /* This basically extracts the mask half of the psw. */
 834         vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
 835         vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
 836         if (reg2) {
 837                 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
 838                 vcpu->run->s.regs.gprs[reg2] |=
 839                         vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
 840         }
 841         return 0;
 842 }
 843
 844 #define PFMF_RESERVED   0xfffc0101UL
 845 #define PFMF_SK         0x00020000UL
 846 #define PFMF_CF         0x00010000UL
 847 #define PFMF_UI         0x00008000UL
 848 #define PFMF_FSC        0x00007000UL
 849 #define PFMF_NQ         0x00000800UL
 850 #define PFMF_MR         0x00000400UL
 851 #define PFMF_MC         0x00000200UL
 852 #define PFMF_KEY        0x000000feUL
 853
 854 static int handle_pfmf(struct kvm_vcpu *vcpu)
 855 {
 856         bool mr = false, mc = false, nq;
 857         int reg1, reg2;
 858         unsigned long start, end;
 859         unsigned char key;
 860
 861         vcpu->stat.instruction_pfmf++;
 862
 863         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 864
 865         if (!test_kvm_facility(vcpu->kvm, 8))
 866                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
 867
 868         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 869                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 870
 871         if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
 872                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 873
 874         /* Only provide non-quiescing support if enabled for the guest */
 875         if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ &&
 876             !test_kvm_facility(vcpu->kvm, 14))
 877                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 878
 879         /* Only provide conditional-SSKE support if enabled for the guest */
 880         if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK &&
 881             test_kvm_facility(vcpu->kvm, 10)) {
 882                 mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR;
 883                 mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC;
 884         }
 885
 886         nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ;
 887         key = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY;
 888         start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 889         start = kvm_s390_logical_to_effective(vcpu, start);
 890
 891         if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
 892                 if (kvm_s390_check_low_addr_prot_real(vcpu, start))
 893                         return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
 894         }
 895
 896         switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
 897         case 0x00000000:
 898                 /* only 4k frames specify a real address */
 899                 start = kvm_s390_real_to_abs(vcpu, start);
 900                 end = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1);
 901                 break;
 902         case 0x00001000:
 903                 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
 904                 break;
 905         case 0x00002000:
 906                 /* only support 2G frame size if EDAT2 is available and we are
 907                    not in 24-bit addressing mode */
 908                 if (!test_kvm_facility(vcpu->kvm, 78) ||
 909                     psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_24BIT)
 910                         return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 911                 end = (start + _REGION3_SIZE) & ~(_REGION3_SIZE - 1);
 912                 break;
 913         default:
 914                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 915         }
 916
 917         while (start != end) {
 918                 unsigned long useraddr;
 919
 920                 /* Translate guest address to host address */
 921                 useraddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
 922                 if (kvm_is_error_hva(useraddr))
 923                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 924
 925                 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
 926                         if (clear_user((void __user *)useraddr, PAGE_SIZE))
 927                                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 928                 }
 929
 930                 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
 931                         int rc = kvm_s390_skey_check_enable(vcpu);
 932
 933                         if (rc)
 934                                 return rc;
 935                         down_read(&current->mm->mmap_sem);
 936                         rc = cond_set_guest_storage_key(current->mm, useraddr,
 937                                                         key, NULL, nq, mr, mc);
 938                         up_read(&current->mm->mmap_sem);
 939                         if (rc < 0)
 940                                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 941                 }
 942
 943                 start += PAGE_SIZE;
 944         }
 945         if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
 946                 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) {
 947                         vcpu->run->s.regs.gprs[reg2] = end;
 948                 } else {
 949                         vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL;
 950                         end = kvm_s390_logical_to_effective(vcpu, end);
 951                         vcpu->run->s.regs.gprs[reg2] |= end;
 952                 }
 953         }
 954         return 0;
 955 }
 956
 957 static inline int do_essa(struct kvm_vcpu *vcpu, const int orc)
 958 {
 959         struct kvm_s390_migration_state *ms = vcpu->kvm->arch.migration_state;
 960         int r1, r2, nappended, entries;
 961         unsigned long gfn, hva, res, pgstev, ptev;
 962         unsigned long *cbrlo;
 963
 964         /*
 965          * We don't need to set SD.FPF.SK to 1 here, because if we have a
 966          * machine check here we either handle it or crash
 967          */
 968
 969         kvm_s390_get_regs_rre(vcpu, &r1, &r2);
 970         gfn = vcpu->run->s.regs.gprs[r2] >> PAGE_SHIFT;
 971         hva = gfn_to_hva(vcpu->kvm, gfn);
 972         entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
 973
 974         if (kvm_is_error_hva(hva))
 975                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 976
 977         nappended = pgste_perform_essa(vcpu->kvm->mm, hva, orc, &ptev, &pgstev);
 978         if (nappended < 0) {
 979                 res = orc ? 0x10 : 0;
 980                 vcpu->run->s.regs.gprs[r1] = res; /* Exception Indication */
 981                 return 0;
 982         }
 983         res = (pgstev & _PGSTE_GPS_USAGE_MASK) >> 22;
 984         /*
 985          * Set the block-content state part of the result. 0 means resident, so
 986          * nothing to do if the page is valid. 2 is for preserved pages
 987          * (non-present and non-zero), and 3 for zero pages (non-present and
 988          * zero).
 989          */
 990         if (ptev & _PAGE_INVALID) {
 991                 res |= 2;
 992                 if (pgstev & _PGSTE_GPS_ZERO)
 993                         res |= 1;
 994         }
 995         if (pgstev & _PGSTE_GPS_NODAT)
 996                 res |= 0x20;
 997         vcpu->run->s.regs.gprs[r1] = res;
 998         /*
 999          * It is possible that all the normal 511 slots were full, in which case
1000          * we will now write in the 512th slot, which is reserved for host use.
1001          * In both cases we let the normal essa handling code process all the
1002          * slots, including the reserved one, if needed.
1003          */
1004         if (nappended > 0) {
1005                 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo & PAGE_MASK);
1006                 cbrlo[entries] = gfn << PAGE_SHIFT;
1007         }
1008
1009         if (orc && gfn < ms->bitmap_size) {
1010                 /* increment only if we are really flipping the bit to 1 */
1011                 if (!test_and_set_bit(gfn, ms->pgste_bitmap))
1012                         atomic64_inc(&ms->dirty_pages);
1013         }
1014
1015         return nappended;
1016 }
1017
1018 static int handle_essa(struct kvm_vcpu *vcpu)
1019 {
1020         /* entries expected to be 1FF */
1021         int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1022         unsigned long *cbrlo;
1023         struct gmap *gmap;
1024         int i, orc;
1025
1026         VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries);
1027         gmap = vcpu->arch.gmap;
1028         vcpu->stat.instruction_essa++;
1029         if (!vcpu->kvm->arch.use_cmma)
1030                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1031
1032         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1033                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1034         /* Check for invalid operation request code */
1035         orc = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
1036         /* ORCs 0-6 are always valid */
1037         if (orc > (test_kvm_facility(vcpu->kvm, 147) ? ESSA_SET_STABLE_NODAT
1038                                                 : ESSA_SET_STABLE_IF_RESIDENT))
1039                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1040
1041         if (likely(!vcpu->kvm->arch.migration_state)) {
1042                 /*
1043                  * CMMA is enabled in the KVM settings, but is disabled in
1044                  * the SIE block and in the mm_context, and we are not doing
1045                  * a migration. Enable CMMA in the mm_context.
1046                  * Since we need to take a write lock to write to the context
1047                  * to avoid races with storage keys handling, we check if the
1048                  * value really needs to be written to; if the value is
1049                  * already correct, we do nothing and avoid the lock.
1050                  */
1051                 if (vcpu->kvm->mm->context.use_cmma == 0) {
1052                         down_write(&vcpu->kvm->mm->mmap_sem);
1053                         vcpu->kvm->mm->context.use_cmma = 1;
1054                         up_write(&vcpu->kvm->mm->mmap_sem);
1055                 }
1056                 /*
1057                  * If we are here, we are supposed to have CMMA enabled in
1058                  * the SIE block. Enabling CMMA works on a per-CPU basis,
1059                  * while the context use_cmma flag is per process.
1060                  * It's possible that the context flag is enabled and the
1061                  * SIE flag is not, so we set the flag always; if it was
1062                  * already set, nothing changes, otherwise we enable it
1063                  * on this CPU too.
1064                  */
1065                 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
1066                 /* Retry the ESSA instruction */
1067                 kvm_s390_retry_instr(vcpu);
1068         } else {
1069                 /* Account for the possible extra cbrl entry */
1070                 i = do_essa(vcpu, orc);
1071                 if (i < 0)
1072                         return i;
1073                 entries += i;
1074         }
1075         vcpu->arch.sie_block->cbrlo &= PAGE_MASK;       /* reset nceo */
1076         cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
1077         down_read(&gmap->mm->mmap_sem);
1078         for (i = 0; i < entries; ++i)
1079                 __gmap_zap(gmap, cbrlo[i]);
1080         up_read(&gmap->mm->mmap_sem);
1081         return 0;
1082 }
1083
1084 static const intercept_handler_t b9_handlers[256] = {
1085         [0x8a] = handle_ipte_interlock,
1086         [0x8d] = handle_epsw,
1087         [0x8e] = handle_ipte_interlock,
1088         [0x8f] = handle_ipte_interlock,
1089         [0xab] = handle_essa,
1090         [0xaf] = handle_pfmf,
1091 };
1092
1093 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
1094 {
1095         intercept_handler_t handler;
1096
1097         /* This is handled just as for the B2 instructions. */
1098         handler = b9_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
1099         if (handler)
1100                 return handler(vcpu);
1101
1102         return -EOPNOTSUPP;
1103 }
1104
1105 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
1106 {
1107         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1108         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1109         int reg, rc, nr_regs;
1110         u32 ctl_array[16];
1111         u64 ga;
1112         u8 ar;
1113
1114         vcpu->stat.instruction_lctl++;
1115
1116         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1117                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1118
1119         ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1120
1121         if (ga & 3)
1122                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1123
1124         VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1125         trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga);
1126
1127         nr_regs = ((reg3 - reg1) & 0xf) + 1;
1128         rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1129         if (rc)
1130                 return kvm_s390_inject_prog_cond(vcpu, rc);
1131         reg = reg1;
1132         nr_regs = 0;
1133         do {
1134                 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
1135                 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++];
1136                 if (reg == reg3)
1137                         break;
1138                 reg = (reg + 1) % 16;
1139         } while (1);
1140         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1141         return 0;
1142 }
1143
1144 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu)
1145 {
1146         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1147         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1148         int reg, rc, nr_regs;
1149         u32 ctl_array[16];
1150         u64 ga;
1151         u8 ar;
1152
1153         vcpu->stat.instruction_stctl++;
1154
1155         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1156                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1157
1158         ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1159
1160         if (ga & 3)
1161                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1162
1163         VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1164         trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga);
1165
1166         reg = reg1;
1167         nr_regs = 0;
1168         do {
1169                 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1170                 if (reg == reg3)
1171                         break;
1172                 reg = (reg + 1) % 16;
1173         } while (1);
1174         rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1175         return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1176 }
1177
1178 static int handle_lctlg(struct kvm_vcpu *vcpu)
1179 {
1180         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1181         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1182         int reg, rc, nr_regs;
1183         u64 ctl_array[16];
1184         u64 ga;
1185         u8 ar;
1186
1187         vcpu->stat.instruction_lctlg++;
1188
1189         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1190                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1191
1192         ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1193
1194         if (ga & 7)
1195                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1196
1197         VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1198         trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga);
1199
1200         nr_regs = ((reg3 - reg1) & 0xf) + 1;
1201         rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1202         if (rc)
1203                 return kvm_s390_inject_prog_cond(vcpu, rc);
1204         reg = reg1;
1205         nr_regs = 0;
1206         do {
1207                 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++];
1208                 if (reg == reg3)
1209                         break;
1210                 reg = (reg + 1) % 16;
1211         } while (1);
1212         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1213         return 0;
1214 }
1215
1216 static int handle_stctg(struct kvm_vcpu *vcpu)
1217 {
1218         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1219         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1220         int reg, rc, nr_regs;
1221         u64 ctl_array[16];
1222         u64 ga;
1223         u8 ar;
1224
1225         vcpu->stat.instruction_stctg++;
1226
1227         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1228                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1229
1230         ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1231
1232         if (ga & 7)
1233                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1234
1235         VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1236         trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga);
1237
1238         reg = reg1;
1239         nr_regs = 0;
1240         do {
1241                 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1242                 if (reg == reg3)
1243                         break;
1244                 reg = (reg + 1) % 16;
1245         } while (1);
1246         rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1247         return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1248 }
1249
1250 static const intercept_handler_t eb_handlers[256] = {
1251         [0x2f] = handle_lctlg,
1252         [0x25] = handle_stctg,
1253         [0x60] = handle_ri,
1254         [0x61] = handle_ri,
1255         [0x62] = handle_ri,
1256 };
1257
1258 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
1259 {
1260         intercept_handler_t handler;
1261
1262         handler = eb_handlers[vcpu->arch.sie_block->ipb & 0xff];
1263         if (handler)
1264                 return handler(vcpu);
1265         return -EOPNOTSUPP;
1266 }
1267
1268 static int handle_tprot(struct kvm_vcpu *vcpu)
1269 {
1270         u64 address1, address2;
1271         unsigned long hva, gpa;
1272         int ret = 0, cc = 0;
1273         bool writable;
1274         u8 ar;
1275
1276         vcpu->stat.instruction_tprot++;
1277
1278         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1279                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1280
1281         kvm_s390_get_base_disp_sse(vcpu, &address1, &address2, &ar, NULL);
1282
1283         /* we only handle the Linux memory detection case:
1284          * access key == 0
1285          * everything else goes to userspace. */
1286         if (address2 & 0xf0)
1287                 return -EOPNOTSUPP;
1288         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1289                 ipte_lock(vcpu);
1290         ret = guest_translate_address(vcpu, address1, ar, &gpa, GACC_STORE);
1291         if (ret == PGM_PROTECTION) {
1292                 /* Write protected? Try again with read-only... */
1293                 cc = 1;
1294                 ret = guest_translate_address(vcpu, address1, ar, &gpa,
1295                                               GACC_FETCH);
1296         }
1297         if (ret) {
1298                 if (ret == PGM_ADDRESSING || ret == PGM_TRANSLATION_SPEC) {
1299                         ret = kvm_s390_inject_program_int(vcpu, ret);
1300                 } else if (ret > 0) {
1301                         /* Translation not available */
1302                         kvm_s390_set_psw_cc(vcpu, 3);
1303                         ret = 0;
1304                 }
1305                 goto out_unlock;
1306         }
1307
1308         hva = gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable);
1309         if (kvm_is_error_hva(hva)) {
1310                 ret = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1311         } else {
1312                 if (!writable)
1313                         cc = 1;         /* Write not permitted ==> read-only */
1314                 kvm_s390_set_psw_cc(vcpu, cc);
1315                 /* Note: CC2 only occurs for storage keys (not supported yet) */
1316         }
1317 out_unlock:
1318         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1319                 ipte_unlock(vcpu);
1320         return ret;
1321 }
1322
1323 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
1324 {
1325         /* For e5xx... instructions we only handle TPROT */
1326         if ((vcpu->arch.sie_block->ipa & 0x00ff) == 0x01)
1327                 return handle_tprot(vcpu);
1328         return -EOPNOTSUPP;
1329 }
1330
1331 static int handle_sckpf(struct kvm_vcpu *vcpu)
1332 {
1333         u32 value;
1334
1335         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1336                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1337
1338         if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
1339                 return kvm_s390_inject_program_int(vcpu,
1340                                                    PGM_SPECIFICATION);
1341
1342         value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
1343         vcpu->arch.sie_block->todpr = value;
1344
1345         return 0;
1346 }
1347
1348 static int handle_ptff(struct kvm_vcpu *vcpu)
1349 {
1350         /* we don't emulate any control instructions yet */
1351         kvm_s390_set_psw_cc(vcpu, 3);
1352         return 0;
1353 }
1354
1355 static const intercept_handler_t x01_handlers[256] = {
1356         [0x04] = handle_ptff,
1357         [0x07] = handle_sckpf,
1358 };
1359
1360 int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
1361 {
1362         intercept_handler_t handler;
1363
1364         handler = x01_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
1365         if (handler)
1366                 return handler(vcpu);
1367         return -EOPNOTSUPP;
1368 }