s390/kvm/priv.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * handling privileged instructions
   4  *
   5  * Copyright IBM Corp. 2008, 2020
   6  *
   7  *    Author(s): Carsten Otte <cotte@de.ibm.com>
   8  *               Christian Borntraeger <borntraeger@de.ibm.com>
   9  */
  10
  11 #include <linux/kvm.h>
  12 #include <linux/gfp.h>
  13 #include <linux/errno.h>
  14 #include <linux/mm_types.h>
  15 #include <linux/pgtable.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/page-states.h>
  24 #include <asm/gmap.h>
  25 #include <asm/io.h>
  26 #include <asm/ptrace.h>
  27 #include <asm/sclp.h>
  28 #include <asm/ap.h>
  29 #include "gaccess.h"
  30 #include "kvm-s390.h"
  31 #include "trace.h"
  32
  33 static int handle_ri(struct kvm_vcpu *vcpu)
  34 {
  35         vcpu->stat.instruction_ri++;
  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         vcpu->stat.instruction_gs++;
  57
  58         if (test_kvm_facility(vcpu->kvm, 133)) {
  59                 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (lazy)");
  60                 preempt_disable();
  61                 __ctl_set_bit(2, 4);
  62                 current->thread.gs_cb = (struct gs_cb *)&vcpu->run->s.regs.gscb;
  63                 restore_gs_cb(current->thread.gs_cb);
  64                 preempt_enable();
  65                 vcpu->arch.sie_block->ecb |= ECB_GS;
  66                 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
  67                 vcpu->arch.gs_enabled = 1;
  68                 kvm_s390_retry_instr(vcpu);
  69                 return 0;
  70         } else
  71                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
  72 }
  73
  74 int kvm_s390_handle_e3(struct kvm_vcpu *vcpu)
  75 {
  76         int code = vcpu->arch.sie_block->ipb & 0xff;
  77
  78         if (code == 0x49 || code == 0x4d)
  79                 return handle_gs(vcpu);
  80         else
  81                 return -EOPNOTSUPP;
  82 }
  83 /* Handle SCK (SET CLOCK) interception */
  84 static int handle_set_clock(struct kvm_vcpu *vcpu)
  85 {
  86         struct kvm_s390_vm_tod_clock gtod = { 0 };
  87         int rc;
  88         u8 ar;
  89         u64 op2;
  90
  91         vcpu->stat.instruction_sck++;
  92
  93         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
  94                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
  95
  96         op2 = kvm_s390_get_base_disp_s(vcpu, &ar);
  97         if (op2 & 7)    /* Operand must be on a doubleword boundary */
  98                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
  99         rc = read_guest(vcpu, op2, ar, &gtod.tod, sizeof(gtod.tod));
 100         if (rc)
 101                 return kvm_s390_inject_prog_cond(vcpu, rc);
 102
 103         VCPU_EVENT(vcpu, 3, "SCK: setting guest TOD to 0x%llx", gtod.tod);
 104         /*
 105          * To set the TOD clock the kvm lock must be taken, but the vcpu lock
 106          * is already held in handle_set_clock. The usual lock order is the
 107          * opposite.  As SCK is deprecated and should not be used in several
 108          * cases, for example when the multiple epoch facility or TOD clock
 109          * steering facility is installed (see Principles of Operation),  a
 110          * slow path can be used.  If the lock can not be taken via try_lock,
 111          * the instruction will be retried via -EAGAIN at a later point in
 112          * time.
 113          */
 114         if (!kvm_s390_try_set_tod_clock(vcpu->kvm, &gtod)) {
 115                 kvm_s390_retry_instr(vcpu);
 116                 return -EAGAIN;
 117         }
 118
 119         kvm_s390_set_psw_cc(vcpu, 0);
 120         return 0;
 121 }
 122
 123 static int handle_set_prefix(struct kvm_vcpu *vcpu)
 124 {
 125         u64 operand2;
 126         u32 address;
 127         int rc;
 128         u8 ar;
 129
 130         vcpu->stat.instruction_spx++;
 131
 132         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 133                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 134
 135         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 136
 137         /* must be word boundary */
 138         if (operand2 & 3)
 139                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 140
 141         /* get the value */
 142         rc = read_guest(vcpu, operand2, ar, &address, sizeof(address));
 143         if (rc)
 144                 return kvm_s390_inject_prog_cond(vcpu, rc);
 145
 146         address &= 0x7fffe000u;
 147
 148         /*
 149          * Make sure the new value is valid memory. We only need to check the
 150          * first page, since address is 8k aligned and memory pieces are always
 151          * at least 1MB aligned and have at least a size of 1MB.
 152          */
 153         if (kvm_is_error_gpa(vcpu->kvm, address))
 154                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 155
 156         kvm_s390_set_prefix(vcpu, address);
 157         trace_kvm_s390_handle_prefix(vcpu, 1, address);
 158         return 0;
 159 }
 160
 161 static int handle_store_prefix(struct kvm_vcpu *vcpu)
 162 {
 163         u64 operand2;
 164         u32 address;
 165         int rc;
 166         u8 ar;
 167
 168         vcpu->stat.instruction_stpx++;
 169
 170         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 171                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 172
 173         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 174
 175         /* must be word boundary */
 176         if (operand2 & 3)
 177                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 178
 179         address = kvm_s390_get_prefix(vcpu);
 180
 181         /* get the value */
 182         rc = write_guest(vcpu, operand2, ar, &address, sizeof(address));
 183         if (rc)
 184                 return kvm_s390_inject_prog_cond(vcpu, rc);
 185
 186         VCPU_EVENT(vcpu, 3, "STPX: storing prefix 0x%x into 0x%llx", address, operand2);
 187         trace_kvm_s390_handle_prefix(vcpu, 0, address);
 188         return 0;
 189 }
 190
 191 static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
 192 {
 193         u16 vcpu_id = vcpu->vcpu_id;
 194         u64 ga;
 195         int rc;
 196         u8 ar;
 197
 198         vcpu->stat.instruction_stap++;
 199
 200         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 201                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 202
 203         ga = kvm_s390_get_base_disp_s(vcpu, &ar);
 204
 205         if (ga & 1)
 206                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 207
 208         rc = write_guest(vcpu, ga, ar, &vcpu_id, sizeof(vcpu_id));
 209         if (rc)
 210                 return kvm_s390_inject_prog_cond(vcpu, rc);
 211
 212         VCPU_EVENT(vcpu, 3, "STAP: storing cpu address (%u) to 0x%llx", vcpu_id, ga);
 213         trace_kvm_s390_handle_stap(vcpu, ga);
 214         return 0;
 215 }
 216
 217 int kvm_s390_skey_check_enable(struct kvm_vcpu *vcpu)
 218 {
 219         int rc;
 220
 221         trace_kvm_s390_skey_related_inst(vcpu);
 222         /* Already enabled? */
 223         if (vcpu->arch.skey_enabled)
 224                 return 0;
 225
 226         rc = s390_enable_skey();
 227         VCPU_EVENT(vcpu, 3, "enabling storage keys for guest: %d", rc);
 228         if (rc)
 229                 return rc;
 230
 231         if (kvm_s390_test_cpuflags(vcpu, CPUSTAT_KSS))
 232                 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_KSS);
 233         if (!vcpu->kvm->arch.use_skf)
 234                 vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
 235         else
 236                 vcpu->arch.sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | ICTL_RRBE);
 237         vcpu->arch.skey_enabled = true;
 238         return 0;
 239 }
 240
 241 static int try_handle_skey(struct kvm_vcpu *vcpu)
 242 {
 243         int rc;
 244
 245         rc = kvm_s390_skey_check_enable(vcpu);
 246         if (rc)
 247                 return rc;
 248         if (vcpu->kvm->arch.use_skf) {
 249                 /* with storage-key facility, SIE interprets it for us */
 250                 kvm_s390_retry_instr(vcpu);
 251                 VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
 252                 return -EAGAIN;
 253         }
 254         return 0;
 255 }
 256
 257 static int handle_iske(struct kvm_vcpu *vcpu)
 258 {
 259         unsigned long gaddr, vmaddr;
 260         unsigned char key;
 261         int reg1, reg2;
 262         bool unlocked;
 263         int rc;
 264
 265         vcpu->stat.instruction_iske++;
 266
 267         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 268                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 269
 270         rc = try_handle_skey(vcpu);
 271         if (rc)
 272                 return rc != -EAGAIN ? rc : 0;
 273
 274         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 275
 276         gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 277         gaddr = kvm_s390_logical_to_effective(vcpu, gaddr);
 278         gaddr = kvm_s390_real_to_abs(vcpu, gaddr);
 279         vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr));
 280         if (kvm_is_error_hva(vmaddr))
 281                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 282 retry:
 283         unlocked = false;
 284         mmap_read_lock(current->mm);
 285         rc = get_guest_storage_key(current->mm, vmaddr, &key);
 286
 287         if (rc) {
 288                 rc = fixup_user_fault(current->mm, vmaddr,
 289                                       FAULT_FLAG_WRITE, &unlocked);
 290                 if (!rc) {
 291                         mmap_read_unlock(current->mm);
 292                         goto retry;
 293                 }
 294         }
 295         mmap_read_unlock(current->mm);
 296         if (rc == -EFAULT)
 297                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 298         if (rc < 0)
 299                 return rc;
 300         vcpu->run->s.regs.gprs[reg1] &= ~0xff;
 301         vcpu->run->s.regs.gprs[reg1] |= key;
 302         return 0;
 303 }
 304
 305 static int handle_rrbe(struct kvm_vcpu *vcpu)
 306 {
 307         unsigned long vmaddr, gaddr;
 308         int reg1, reg2;
 309         bool unlocked;
 310         int rc;
 311
 312         vcpu->stat.instruction_rrbe++;
 313
 314         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 315                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 316
 317         rc = try_handle_skey(vcpu);
 318         if (rc)
 319                 return rc != -EAGAIN ? rc : 0;
 320
 321         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 322
 323         gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 324         gaddr = kvm_s390_logical_to_effective(vcpu, gaddr);
 325         gaddr = kvm_s390_real_to_abs(vcpu, gaddr);
 326         vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr));
 327         if (kvm_is_error_hva(vmaddr))
 328                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 329 retry:
 330         unlocked = false;
 331         mmap_read_lock(current->mm);
 332         rc = reset_guest_reference_bit(current->mm, vmaddr);
 333         if (rc < 0) {
 334                 rc = fixup_user_fault(current->mm, vmaddr,
 335                                       FAULT_FLAG_WRITE, &unlocked);
 336                 if (!rc) {
 337                         mmap_read_unlock(current->mm);
 338                         goto retry;
 339                 }
 340         }
 341         mmap_read_unlock(current->mm);
 342         if (rc == -EFAULT)
 343                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 344         if (rc < 0)
 345                 return rc;
 346         kvm_s390_set_psw_cc(vcpu, rc);
 347         return 0;
 348 }
 349
 350 #define SSKE_NQ 0x8
 351 #define SSKE_MR 0x4
 352 #define SSKE_MC 0x2
 353 #define SSKE_MB 0x1
 354 static int handle_sske(struct kvm_vcpu *vcpu)
 355 {
 356         unsigned char m3 = vcpu->arch.sie_block->ipb >> 28;
 357         unsigned long start, end;
 358         unsigned char key, oldkey;
 359         int reg1, reg2;
 360         bool unlocked;
 361         int rc;
 362
 363         vcpu->stat.instruction_sske++;
 364
 365         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 366                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 367
 368         rc = try_handle_skey(vcpu);
 369         if (rc)
 370                 return rc != -EAGAIN ? rc : 0;
 371
 372         if (!test_kvm_facility(vcpu->kvm, 8))
 373                 m3 &= ~SSKE_MB;
 374         if (!test_kvm_facility(vcpu->kvm, 10))
 375                 m3 &= ~(SSKE_MC | SSKE_MR);
 376         if (!test_kvm_facility(vcpu->kvm, 14))
 377                 m3 &= ~SSKE_NQ;
 378
 379         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 380
 381         key = vcpu->run->s.regs.gprs[reg1] & 0xfe;
 382         start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 383         start = kvm_s390_logical_to_effective(vcpu, start);
 384         if (m3 & SSKE_MB) {
 385                 /* start already designates an absolute address */
 386                 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
 387         } else {
 388                 start = kvm_s390_real_to_abs(vcpu, start);
 389                 end = start + PAGE_SIZE;
 390         }
 391
 392         while (start != end) {
 393                 unsigned long vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
 394                 unlocked = false;
 395
 396                 if (kvm_is_error_hva(vmaddr))
 397                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 398
 399                 mmap_read_lock(current->mm);
 400                 rc = cond_set_guest_storage_key(current->mm, vmaddr, key, &oldkey,
 401                                                 m3 & SSKE_NQ, m3 & SSKE_MR,
 402                                                 m3 & SSKE_MC);
 403
 404                 if (rc < 0) {
 405                         rc = fixup_user_fault(current->mm, vmaddr,
 406                                               FAULT_FLAG_WRITE, &unlocked);
 407                         rc = !rc ? -EAGAIN : rc;
 408                 }
 409                 mmap_read_unlock(current->mm);
 410                 if (rc == -EFAULT)
 411                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 412                 if (rc == -EAGAIN)
 413                         continue;
 414                 if (rc < 0)
 415                         return rc;
 416                 start += PAGE_SIZE;
 417         }
 418
 419         if (m3 & (SSKE_MC | SSKE_MR)) {
 420                 if (m3 & SSKE_MB) {
 421                         /* skey in reg1 is unpredictable */
 422                         kvm_s390_set_psw_cc(vcpu, 3);
 423                 } else {
 424                         kvm_s390_set_psw_cc(vcpu, rc);
 425                         vcpu->run->s.regs.gprs[reg1] &= ~0xff00UL;
 426                         vcpu->run->s.regs.gprs[reg1] |= (u64) oldkey << 8;
 427                 }
 428         }
 429         if (m3 & SSKE_MB) {
 430                 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT)
 431                         vcpu->run->s.regs.gprs[reg2] &= ~PAGE_MASK;
 432                 else
 433                         vcpu->run->s.regs.gprs[reg2] &= ~0xfffff000UL;
 434                 end = kvm_s390_logical_to_effective(vcpu, end);
 435                 vcpu->run->s.regs.gprs[reg2] |= end;
 436         }
 437         return 0;
 438 }
 439
 440 static int handle_ipte_interlock(struct kvm_vcpu *vcpu)
 441 {
 442         vcpu->stat.instruction_ipte_interlock++;
 443         if (psw_bits(vcpu->arch.sie_block->gpsw).pstate)
 444                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 445         wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu->kvm));
 446         kvm_s390_retry_instr(vcpu);
 447         VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation");
 448         return 0;
 449 }
 450
 451 static int handle_test_block(struct kvm_vcpu *vcpu)
 452 {
 453         gpa_t addr;
 454         int reg2;
 455
 456         vcpu->stat.instruction_tb++;
 457
 458         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 459                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 460
 461         kvm_s390_get_regs_rre(vcpu, NULL, &reg2);
 462         addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 463         addr = kvm_s390_logical_to_effective(vcpu, addr);
 464         if (kvm_s390_check_low_addr_prot_real(vcpu, addr))
 465                 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
 466         addr = kvm_s390_real_to_abs(vcpu, addr);
 467
 468         if (kvm_is_error_gpa(vcpu->kvm, addr))
 469                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 470         /*
 471          * We don't expect errors on modern systems, and do not care
 472          * about storage keys (yet), so let's just clear the page.
 473          */
 474         if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE))
 475                 return -EFAULT;
 476         kvm_s390_set_psw_cc(vcpu, 0);
 477         vcpu->run->s.regs.gprs[0] = 0;
 478         return 0;
 479 }
 480
 481 static int handle_tpi(struct kvm_vcpu *vcpu)
 482 {
 483         struct kvm_s390_interrupt_info *inti;
 484         unsigned long len;
 485         u32 tpi_data[3];
 486         int rc;
 487         u64 addr;
 488         u8 ar;
 489
 490         vcpu->stat.instruction_tpi++;
 491
 492         addr = kvm_s390_get_base_disp_s(vcpu, &ar);
 493         if (addr & 3)
 494                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 495
 496         inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0);
 497         if (!inti) {
 498                 kvm_s390_set_psw_cc(vcpu, 0);
 499                 return 0;
 500         }
 501
 502         tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr;
 503         tpi_data[1] = inti->io.io_int_parm;
 504         tpi_data[2] = inti->io.io_int_word;
 505         if (addr) {
 506                 /*
 507                  * Store the two-word I/O interruption code into the
 508                  * provided area.
 509                  */
 510                 len = sizeof(tpi_data) - 4;
 511                 rc = write_guest(vcpu, addr, ar, &tpi_data, len);
 512                 if (rc) {
 513                         rc = kvm_s390_inject_prog_cond(vcpu, rc);
 514                         goto reinject_interrupt;
 515                 }
 516         } else {
 517                 /*
 518                  * Store the three-word I/O interruption code into
 519                  * the appropriate lowcore area.
 520                  */
 521                 len = sizeof(tpi_data);
 522                 if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) {
 523                         /* failed writes to the low core are not recoverable */
 524                         rc = -EFAULT;
 525                         goto reinject_interrupt;
 526                 }
 527         }
 528
 529         /* irq was successfully handed to the guest */
 530         kfree(inti);
 531         kvm_s390_set_psw_cc(vcpu, 1);
 532         return 0;
 533 reinject_interrupt:
 534         /*
 535          * If we encounter a problem storing the interruption code, the
 536          * instruction is suppressed from the guest's view: reinject the
 537          * interrupt.
 538          */
 539         if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) {
 540                 kfree(inti);
 541                 rc = -EFAULT;
 542         }
 543         /* don't set the cc, a pgm irq was injected or we drop to user space */
 544         return rc ? -EFAULT : 0;
 545 }
 546
 547 static int handle_tsch(struct kvm_vcpu *vcpu)
 548 {
 549         struct kvm_s390_interrupt_info *inti = NULL;
 550         const u64 isc_mask = 0xffUL << 24; /* all iscs set */
 551
 552         vcpu->stat.instruction_tsch++;
 553
 554         /* a valid schid has at least one bit set */
 555         if (vcpu->run->s.regs.gprs[1])
 556                 inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask,
 557                                            vcpu->run->s.regs.gprs[1]);
 558
 559         /*
 560          * Prepare exit to userspace.
 561          * We indicate whether we dequeued a pending I/O interrupt
 562          * so that userspace can re-inject it if the instruction gets
 563          * a program check. While this may re-order the pending I/O
 564          * interrupts, this is no problem since the priority is kept
 565          * intact.
 566          */
 567         vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
 568         vcpu->run->s390_tsch.dequeued = !!inti;
 569         if (inti) {
 570                 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
 571                 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
 572                 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
 573                 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
 574         }
 575         vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
 576         kfree(inti);
 577         return -EREMOTE;
 578 }
 579
 580 static int handle_io_inst(struct kvm_vcpu *vcpu)
 581 {
 582         VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
 583
 584         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 585                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 586
 587         if (vcpu->kvm->arch.css_support) {
 588                 /*
 589                  * Most I/O instructions will be handled by userspace.
 590                  * Exceptions are tpi and the interrupt portion of tsch.
 591                  */
 592                 if (vcpu->arch.sie_block->ipa == 0xb236)
 593                         return handle_tpi(vcpu);
 594                 if (vcpu->arch.sie_block->ipa == 0xb235)
 595                         return handle_tsch(vcpu);
 596                 /* Handle in userspace. */
 597                 vcpu->stat.instruction_io_other++;
 598                 return -EOPNOTSUPP;
 599         } else {
 600                 /*
 601                  * Set condition code 3 to stop the guest from issuing channel
 602                  * I/O instructions.
 603                  */
 604                 kvm_s390_set_psw_cc(vcpu, 3);
 605                 return 0;
 606         }
 607 }
 608
 609 /*
 610  * handle_pqap: Handling pqap interception
 611  * @vcpu: the vcpu having issue the pqap instruction
 612  *
 613  * We now support PQAP/AQIC instructions and we need to correctly
 614  * answer the guest even if no dedicated driver's hook is available.
 615  *
 616  * The intercepting code calls a dedicated callback for this instruction
 617  * if a driver did register one in the CRYPTO satellite of the
 618  * SIE block.
 619  *
 620  * If no callback is available, the queues are not available, return this
 621  * response code to the caller and set CC to 3.
 622  * Else return the response code returned by the callback.
 623  */
 624 static int handle_pqap(struct kvm_vcpu *vcpu)
 625 {
 626         struct ap_queue_status status = {};
 627         crypto_hook pqap_hook;
 628         unsigned long reg0;
 629         int ret;
 630         uint8_t fc;
 631
 632         /* Verify that the AP instruction are available */
 633         if (!ap_instructions_available())
 634                 return -EOPNOTSUPP;
 635         /* Verify that the guest is allowed to use AP instructions */
 636         if (!(vcpu->arch.sie_block->eca & ECA_APIE))
 637                 return -EOPNOTSUPP;
 638         /*
 639          * The only possibly intercepted functions when AP instructions are
 640          * available for the guest are AQIC and TAPQ with the t bit set
 641          * since we do not set IC.3 (FIII) we currently will only intercept
 642          * the AQIC function code.
 643          * Note: running nested under z/VM can result in intercepts for other
 644          * function codes, e.g. PQAP(QCI). We do not support this and bail out.
 645          */
 646         reg0 = vcpu->run->s.regs.gprs[0];
 647         fc = (reg0 >> 24) & 0xff;
 648         if (fc != 0x03)
 649                 return -EOPNOTSUPP;
 650
 651         /* PQAP instruction is allowed for guest kernel only */
 652         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 653                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 654
 655         /* Common PQAP instruction specification exceptions */
 656         /* bits 41-47 must all be zeros */
 657         if (reg0 & 0x007f0000UL)
 658                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 659         /* APFT not install and T bit set */
 660         if (!test_kvm_facility(vcpu->kvm, 15) && (reg0 & 0x00800000UL))
 661                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 662         /* APXA not installed and APID greater 64 or APQI greater 16 */
 663         if (!(vcpu->kvm->arch.crypto.crycbd & 0x02) && (reg0 & 0x0000c0f0UL))
 664                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 665
 666         /* AQIC function code specific exception */
 667         /* facility 65 not present for AQIC function code */
 668         if (!test_kvm_facility(vcpu->kvm, 65))
 669                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 670
 671         /*
 672          * If the hook callback is registered, there will be a pointer to the
 673          * hook function pointer in the kvm_s390_crypto structure. Lock the
 674          * owner, retrieve the hook function pointer and call the hook.
 675          */
 676         down_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem);
 677         if (vcpu->kvm->arch.crypto.pqap_hook) {
 678                 pqap_hook = *vcpu->kvm->arch.crypto.pqap_hook;
 679                 ret = pqap_hook(vcpu);
 680                 if (!ret && vcpu->run->s.regs.gprs[1] & 0x00ff0000)
 681                         kvm_s390_set_psw_cc(vcpu, 3);
 682                 up_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem);
 683                 return ret;
 684         }
 685         up_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem);
 686         /*
 687          * A vfio_driver must register a hook.
 688          * No hook means no driver to enable the SIE CRYCB and no queues.
 689          * We send this response to the guest.
 690          */
 691         status.response_code = 0x01;
 692         memcpy(&vcpu->run->s.regs.gprs[1], &status, sizeof(status));
 693         kvm_s390_set_psw_cc(vcpu, 3);
 694         return 0;
 695 }
 696
 697 static int handle_stfl(struct kvm_vcpu *vcpu)
 698 {
 699         int rc;
 700         unsigned int fac;
 701
 702         vcpu->stat.instruction_stfl++;
 703
 704         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 705                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 706
 707         /*
 708          * We need to shift the lower 32 facility bits (bit 0-31) from a u64
 709          * into a u32 memory representation. They will remain bits 0-31.
 710          */
 711         fac = *vcpu->kvm->arch.model.fac_list >> 32;
 712         rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list),
 713                             &fac, sizeof(fac));
 714         if (rc)
 715                 return rc;
 716         VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac);
 717         trace_kvm_s390_handle_stfl(vcpu, fac);
 718         return 0;
 719 }
 720
 721 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
 722 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
 723 #define PSW_ADDR_24 0x0000000000ffffffUL
 724 #define PSW_ADDR_31 0x000000007fffffffUL
 725
 726 int is_valid_psw(psw_t *psw)
 727 {
 728         if (psw->mask & PSW_MASK_UNASSIGNED)
 729                 return 0;
 730         if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
 731                 if (psw->addr & ~PSW_ADDR_31)
 732                         return 0;
 733         }
 734         if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
 735                 return 0;
 736         if ((psw->mask & PSW_MASK_ADDR_MODE) ==  PSW_MASK_EA)
 737                 return 0;
 738         if (psw->addr & 1)
 739                 return 0;
 740         return 1;
 741 }
 742
 743 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
 744 {
 745         psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
 746         psw_compat_t new_psw;
 747         u64 addr;
 748         int rc;
 749         u8 ar;
 750
 751         vcpu->stat.instruction_lpsw++;
 752
 753         if (gpsw->mask & PSW_MASK_PSTATE)
 754                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 755
 756         addr = kvm_s390_get_base_disp_s(vcpu, &ar);
 757         if (addr & 7)
 758                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 759
 760         rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
 761         if (rc)
 762                 return kvm_s390_inject_prog_cond(vcpu, rc);
 763         if (!(new_psw.mask & PSW32_MASK_BASE))
 764                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 765         gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
 766         gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
 767         gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
 768         if (!is_valid_psw(gpsw))
 769                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 770         return 0;
 771 }
 772
 773 static int handle_lpswe(struct kvm_vcpu *vcpu)
 774 {
 775         psw_t new_psw;
 776         u64 addr;
 777         int rc;
 778         u8 ar;
 779
 780         vcpu->stat.instruction_lpswe++;
 781
 782         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 783                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 784
 785         addr = kvm_s390_get_base_disp_s(vcpu, &ar);
 786         if (addr & 7)
 787                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 788         rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
 789         if (rc)
 790                 return kvm_s390_inject_prog_cond(vcpu, rc);
 791         vcpu->arch.sie_block->gpsw = new_psw;
 792         if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
 793                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 794         return 0;
 795 }
 796
 797 static int handle_stidp(struct kvm_vcpu *vcpu)
 798 {
 799         u64 stidp_data = vcpu->kvm->arch.model.cpuid;
 800         u64 operand2;
 801         int rc;
 802         u8 ar;
 803
 804         vcpu->stat.instruction_stidp++;
 805
 806         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 807                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 808
 809         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 810
 811         if (operand2 & 7)
 812                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 813
 814         rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data));
 815         if (rc)
 816                 return kvm_s390_inject_prog_cond(vcpu, rc);
 817
 818         VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data);
 819         return 0;
 820 }
 821
 822 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
 823 {
 824         int cpus = 0;
 825         int n;
 826
 827         cpus = atomic_read(&vcpu->kvm->online_vcpus);
 828
 829         /* deal with other level 3 hypervisors */
 830         if (stsi(mem, 3, 2, 2))
 831                 mem->count = 0;
 832         if (mem->count < 8)
 833                 mem->count++;
 834         for (n = mem->count - 1; n > 0 ; n--)
 835                 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
 836
 837         memset(&mem->vm[0], 0, sizeof(mem->vm[0]));
 838         mem->vm[0].cpus_total = cpus;
 839         mem->vm[0].cpus_configured = cpus;
 840         mem->vm[0].cpus_standby = 0;
 841         mem->vm[0].cpus_reserved = 0;
 842         mem->vm[0].caf = 1000;
 843         memcpy(mem->vm[0].name, "KVMguest", 8);
 844         ASCEBC(mem->vm[0].name, 8);
 845         memcpy(mem->vm[0].cpi, "KVM/Linux       ", 16);
 846         ASCEBC(mem->vm[0].cpi, 16);
 847 }
 848
 849 static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, u8 ar,
 850                                  u8 fc, u8 sel1, u16 sel2)
 851 {
 852         vcpu->run->exit_reason = KVM_EXIT_S390_STSI;
 853         vcpu->run->s390_stsi.addr = addr;
 854         vcpu->run->s390_stsi.ar = ar;
 855         vcpu->run->s390_stsi.fc = fc;
 856         vcpu->run->s390_stsi.sel1 = sel1;
 857         vcpu->run->s390_stsi.sel2 = sel2;
 858 }
 859
 860 static int handle_stsi(struct kvm_vcpu *vcpu)
 861 {
 862         int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
 863         int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
 864         int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
 865         unsigned long mem = 0;
 866         u64 operand2;
 867         int rc = 0;
 868         u8 ar;
 869
 870         vcpu->stat.instruction_stsi++;
 871         VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2);
 872
 873         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 874                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 875
 876         /* Bailout forbidden function codes */
 877         if (fc > 3 && fc != 15)
 878                 goto out_no_data;
 879
 880         /*
 881          * fc 15 is provided only with
 882          *   - PTF/CPU topology support through facility 15
 883          *   - KVM_CAP_S390_USER_STSI
 884          */
 885         if (fc == 15 && (!test_kvm_facility(vcpu->kvm, 11) ||
 886                          !vcpu->kvm->arch.user_stsi))
 887                 goto out_no_data;
 888
 889         if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
 890             || vcpu->run->s.regs.gprs[1] & 0xffff0000)
 891                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 892
 893         if (fc == 0) {
 894                 vcpu->run->s.regs.gprs[0] = 3 << 28;
 895                 kvm_s390_set_psw_cc(vcpu, 0);
 896                 return 0;
 897         }
 898
 899         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 900
 901         if (!kvm_s390_pv_cpu_is_protected(vcpu) && (operand2 & 0xfff))
 902                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 903
 904         switch (fc) {
 905         case 1: /* same handling for 1 and 2 */
 906         case 2:
 907                 mem = get_zeroed_page(GFP_KERNEL_ACCOUNT);
 908                 if (!mem)
 909                         goto out_no_data;
 910                 if (stsi((void *) mem, fc, sel1, sel2))
 911                         goto out_no_data;
 912                 break;
 913         case 3:
 914                 if (sel1 != 2 || sel2 != 2)
 915                         goto out_no_data;
 916                 mem = get_zeroed_page(GFP_KERNEL_ACCOUNT);
 917                 if (!mem)
 918                         goto out_no_data;
 919                 handle_stsi_3_2_2(vcpu, (void *) mem);
 920                 break;
 921         case 15: /* fc 15 is fully handled in userspace */
 922                 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
 923                 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
 924                 return -EREMOTE;
 925         }
 926         if (kvm_s390_pv_cpu_is_protected(vcpu)) {
 927                 memcpy((void *)sida_origin(vcpu->arch.sie_block), (void *)mem,
 928                        PAGE_SIZE);
 929                 rc = 0;
 930         } else {
 931                 rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE);
 932         }
 933         if (rc) {
 934                 rc = kvm_s390_inject_prog_cond(vcpu, rc);
 935                 goto out;
 936         }
 937         if (vcpu->kvm->arch.user_stsi) {
 938                 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
 939                 rc = -EREMOTE;
 940         }
 941         trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
 942         free_page(mem);
 943         kvm_s390_set_psw_cc(vcpu, 0);
 944         vcpu->run->s.regs.gprs[0] = 0;
 945         return rc;
 946 out_no_data:
 947         kvm_s390_set_psw_cc(vcpu, 3);
 948 out:
 949         free_page(mem);
 950         return rc;
 951 }
 952
 953 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
 954 {
 955         switch (vcpu->arch.sie_block->ipa & 0x00ff) {
 956         case 0x02:
 957                 return handle_stidp(vcpu);
 958         case 0x04:
 959                 return handle_set_clock(vcpu);
 960         case 0x10:
 961                 return handle_set_prefix(vcpu);
 962         case 0x11:
 963                 return handle_store_prefix(vcpu);
 964         case 0x12:
 965                 return handle_store_cpu_address(vcpu);
 966         case 0x14:
 967                 return kvm_s390_handle_vsie(vcpu);
 968         case 0x21:
 969         case 0x50:
 970                 return handle_ipte_interlock(vcpu);
 971         case 0x29:
 972                 return handle_iske(vcpu);
 973         case 0x2a:
 974                 return handle_rrbe(vcpu);
 975         case 0x2b:
 976                 return handle_sske(vcpu);
 977         case 0x2c:
 978                 return handle_test_block(vcpu);
 979         case 0x30:
 980         case 0x31:
 981         case 0x32:
 982         case 0x33:
 983         case 0x34:
 984         case 0x35:
 985         case 0x36:
 986         case 0x37:
 987         case 0x38:
 988         case 0x39:
 989         case 0x3a:
 990         case 0x3b:
 991         case 0x3c:
 992         case 0x5f:
 993         case 0x74:
 994         case 0x76:
 995                 return handle_io_inst(vcpu);
 996         case 0x56:
 997                 return handle_sthyi(vcpu);
 998         case 0x7d:
 999                 return handle_stsi(vcpu);
1000         case 0xaf:
1001                 return handle_pqap(vcpu);
1002         case 0xb1:
1003                 return handle_stfl(vcpu);
1004         case 0xb2:
1005                 return handle_lpswe(vcpu);
1006         default:
1007                 return -EOPNOTSUPP;
1008         }
1009 }
1010
1011 static int handle_epsw(struct kvm_vcpu *vcpu)
1012 {
1013         int reg1, reg2;
1014
1015         vcpu->stat.instruction_epsw++;
1016
1017         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
1018
1019         /* This basically extracts the mask half of the psw. */
1020         vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
1021         vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
1022         if (reg2) {
1023                 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
1024                 vcpu->run->s.regs.gprs[reg2] |=
1025                         vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
1026         }
1027         return 0;
1028 }
1029
1030 #define PFMF_RESERVED   0xfffc0101UL
1031 #define PFMF_SK         0x00020000UL
1032 #define PFMF_CF         0x00010000UL
1033 #define PFMF_UI         0x00008000UL
1034 #define PFMF_FSC        0x00007000UL
1035 #define PFMF_NQ         0x00000800UL
1036 #define PFMF_MR         0x00000400UL
1037 #define PFMF_MC         0x00000200UL
1038 #define PFMF_KEY        0x000000feUL
1039
1040 static int handle_pfmf(struct kvm_vcpu *vcpu)
1041 {
1042         bool mr = false, mc = false, nq;
1043         int reg1, reg2;
1044         unsigned long start, end;
1045         unsigned char key;
1046
1047         vcpu->stat.instruction_pfmf++;
1048
1049         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
1050
1051         if (!test_kvm_facility(vcpu->kvm, 8))
1052                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1053
1054         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1055                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1056
1057         if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
1058                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1059
1060         /* Only provide non-quiescing support if enabled for the guest */
1061         if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ &&
1062             !test_kvm_facility(vcpu->kvm, 14))
1063                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1064
1065         /* Only provide conditional-SSKE support if enabled for the guest */
1066         if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK &&
1067             test_kvm_facility(vcpu->kvm, 10)) {
1068                 mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR;
1069                 mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC;
1070         }
1071
1072         nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ;
1073         key = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY;
1074         start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
1075         start = kvm_s390_logical_to_effective(vcpu, start);
1076
1077         if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
1078                 if (kvm_s390_check_low_addr_prot_real(vcpu, start))
1079                         return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
1080         }
1081
1082         switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
1083         case 0x00000000:
1084                 /* only 4k frames specify a real address */
1085                 start = kvm_s390_real_to_abs(vcpu, start);
1086                 end = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1);
1087                 break;
1088         case 0x00001000:
1089                 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
1090                 break;
1091         case 0x00002000:
1092                 /* only support 2G frame size if EDAT2 is available and we are
1093                    not in 24-bit addressing mode */
1094                 if (!test_kvm_facility(vcpu->kvm, 78) ||
1095                     psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_24BIT)
1096                         return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1097                 end = (start + _REGION3_SIZE) & ~(_REGION3_SIZE - 1);
1098                 break;
1099         default:
1100                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1101         }
1102
1103         while (start != end) {
1104                 unsigned long vmaddr;
1105                 bool unlocked = false;
1106
1107                 /* Translate guest address to host address */
1108                 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
1109                 if (kvm_is_error_hva(vmaddr))
1110                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1111
1112                 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
1113                         if (kvm_clear_guest(vcpu->kvm, start, PAGE_SIZE))
1114                                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1115                 }
1116
1117                 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
1118                         int rc = kvm_s390_skey_check_enable(vcpu);
1119
1120                         if (rc)
1121                                 return rc;
1122                         mmap_read_lock(current->mm);
1123                         rc = cond_set_guest_storage_key(current->mm, vmaddr,
1124                                                         key, NULL, nq, mr, mc);
1125                         if (rc < 0) {
1126                                 rc = fixup_user_fault(current->mm, vmaddr,
1127                                                       FAULT_FLAG_WRITE, &unlocked);
1128                                 rc = !rc ? -EAGAIN : rc;
1129                         }
1130                         mmap_read_unlock(current->mm);
1131                         if (rc == -EFAULT)
1132                                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1133                         if (rc == -EAGAIN)
1134                                 continue;
1135                         if (rc < 0)
1136                                 return rc;
1137                 }
1138                 start += PAGE_SIZE;
1139         }
1140         if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
1141                 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) {
1142                         vcpu->run->s.regs.gprs[reg2] = end;
1143                 } else {
1144                         vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL;
1145                         end = kvm_s390_logical_to_effective(vcpu, end);
1146                         vcpu->run->s.regs.gprs[reg2] |= end;
1147                 }
1148         }
1149         return 0;
1150 }
1151
1152 /*
1153  * Must be called with relevant read locks held (kvm->mm->mmap_lock, kvm->srcu)
1154  */
1155 static inline int __do_essa(struct kvm_vcpu *vcpu, const int orc)
1156 {
1157         int r1, r2, nappended, entries;
1158         unsigned long gfn, hva, res, pgstev, ptev;
1159         unsigned long *cbrlo;
1160
1161         /*
1162          * We don't need to set SD.FPF.SK to 1 here, because if we have a
1163          * machine check here we either handle it or crash
1164          */
1165
1166         kvm_s390_get_regs_rre(vcpu, &r1, &r2);
1167         gfn = vcpu->run->s.regs.gprs[r2] >> PAGE_SHIFT;
1168         hva = gfn_to_hva(vcpu->kvm, gfn);
1169         entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1170
1171         if (kvm_is_error_hva(hva))
1172                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1173
1174         nappended = pgste_perform_essa(vcpu->kvm->mm, hva, orc, &ptev, &pgstev);
1175         if (nappended < 0) {
1176                 res = orc ? 0x10 : 0;
1177                 vcpu->run->s.regs.gprs[r1] = res; /* Exception Indication */
1178                 return 0;
1179         }
1180         res = (pgstev & _PGSTE_GPS_USAGE_MASK) >> 22;
1181         /*
1182          * Set the block-content state part of the result. 0 means resident, so
1183          * nothing to do if the page is valid. 2 is for preserved pages
1184          * (non-present and non-zero), and 3 for zero pages (non-present and
1185          * zero).
1186          */
1187         if (ptev & _PAGE_INVALID) {
1188                 res |= 2;
1189                 if (pgstev & _PGSTE_GPS_ZERO)
1190                         res |= 1;
1191         }
1192         if (pgstev & _PGSTE_GPS_NODAT)
1193                 res |= 0x20;
1194         vcpu->run->s.regs.gprs[r1] = res;
1195         /*
1196          * It is possible that all the normal 511 slots were full, in which case
1197          * we will now write in the 512th slot, which is reserved for host use.
1198          * In both cases we let the normal essa handling code process all the
1199          * slots, including the reserved one, if needed.
1200          */
1201         if (nappended > 0) {
1202                 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo & PAGE_MASK);
1203                 cbrlo[entries] = gfn << PAGE_SHIFT;
1204         }
1205
1206         if (orc) {
1207                 struct kvm_memory_slot *ms = gfn_to_memslot(vcpu->kvm, gfn);
1208
1209                 /* Increment only if we are really flipping the bit */
1210                 if (ms && !test_and_set_bit(gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms)))
1211                         atomic64_inc(&vcpu->kvm->arch.cmma_dirty_pages);
1212         }
1213
1214         return nappended;
1215 }
1216
1217 static int handle_essa(struct kvm_vcpu *vcpu)
1218 {
1219         /* entries expected to be 1FF */
1220         int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1221         unsigned long *cbrlo;
1222         struct gmap *gmap;
1223         int i, orc;
1224
1225         VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries);
1226         gmap = vcpu->arch.gmap;
1227         vcpu->stat.instruction_essa++;
1228         if (!vcpu->kvm->arch.use_cmma)
1229                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1230
1231         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1232                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1233         /* Check for invalid operation request code */
1234         orc = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
1235         /* ORCs 0-6 are always valid */
1236         if (orc > (test_kvm_facility(vcpu->kvm, 147) ? ESSA_SET_STABLE_NODAT
1237                                                 : ESSA_SET_STABLE_IF_RESIDENT))
1238                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1239
1240         if (!vcpu->kvm->arch.migration_mode) {
1241                 /*
1242                  * CMMA is enabled in the KVM settings, but is disabled in
1243                  * the SIE block and in the mm_context, and we are not doing
1244                  * a migration. Enable CMMA in the mm_context.
1245                  * Since we need to take a write lock to write to the context
1246                  * to avoid races with storage keys handling, we check if the
1247                  * value really needs to be written to; if the value is
1248                  * already correct, we do nothing and avoid the lock.
1249                  */
1250                 if (vcpu->kvm->mm->context.uses_cmm == 0) {
1251                         mmap_write_lock(vcpu->kvm->mm);
1252                         vcpu->kvm->mm->context.uses_cmm = 1;
1253                         mmap_write_unlock(vcpu->kvm->mm);
1254                 }
1255                 /*
1256                  * If we are here, we are supposed to have CMMA enabled in
1257                  * the SIE block. Enabling CMMA works on a per-CPU basis,
1258                  * while the context use_cmma flag is per process.
1259                  * It's possible that the context flag is enabled and the
1260                  * SIE flag is not, so we set the flag always; if it was
1261                  * already set, nothing changes, otherwise we enable it
1262                  * on this CPU too.
1263                  */
1264                 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
1265                 /* Retry the ESSA instruction */
1266                 kvm_s390_retry_instr(vcpu);
1267         } else {
1268                 int srcu_idx;
1269
1270                 mmap_read_lock(vcpu->kvm->mm);
1271                 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
1272                 i = __do_essa(vcpu, orc);
1273                 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
1274                 mmap_read_unlock(vcpu->kvm->mm);
1275                 if (i < 0)
1276                         return i;
1277                 /* Account for the possible extra cbrl entry */
1278                 entries += i;
1279         }
1280         vcpu->arch.sie_block->cbrlo &= PAGE_MASK;       /* reset nceo */
1281         cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
1282         mmap_read_lock(gmap->mm);
1283         for (i = 0; i < entries; ++i)
1284                 __gmap_zap(gmap, cbrlo[i]);
1285         mmap_read_unlock(gmap->mm);
1286         return 0;
1287 }
1288
1289 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
1290 {
1291         switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1292         case 0x8a:
1293         case 0x8e:
1294         case 0x8f:
1295                 return handle_ipte_interlock(vcpu);
1296         case 0x8d:
1297                 return handle_epsw(vcpu);
1298         case 0xab:
1299                 return handle_essa(vcpu);
1300         case 0xaf:
1301                 return handle_pfmf(vcpu);
1302         default:
1303                 return -EOPNOTSUPP;
1304         }
1305 }
1306
1307 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
1308 {
1309         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1310         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1311         int reg, rc, nr_regs;
1312         u32 ctl_array[16];
1313         u64 ga;
1314         u8 ar;
1315
1316         vcpu->stat.instruction_lctl++;
1317
1318         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1319                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1320
1321         ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1322
1323         if (ga & 3)
1324                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1325
1326         VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1327         trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga);
1328
1329         nr_regs = ((reg3 - reg1) & 0xf) + 1;
1330         rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1331         if (rc)
1332                 return kvm_s390_inject_prog_cond(vcpu, rc);
1333         reg = reg1;
1334         nr_regs = 0;
1335         do {
1336                 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
1337                 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++];
1338                 if (reg == reg3)
1339                         break;
1340                 reg = (reg + 1) % 16;
1341         } while (1);
1342         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1343         return 0;
1344 }
1345
1346 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu)
1347 {
1348         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1349         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1350         int reg, rc, nr_regs;
1351         u32 ctl_array[16];
1352         u64 ga;
1353         u8 ar;
1354
1355         vcpu->stat.instruction_stctl++;
1356
1357         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1358                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1359
1360         ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1361
1362         if (ga & 3)
1363                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1364
1365         VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1366         trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga);
1367
1368         reg = reg1;
1369         nr_regs = 0;
1370         do {
1371                 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1372                 if (reg == reg3)
1373                         break;
1374                 reg = (reg + 1) % 16;
1375         } while (1);
1376         rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1377         return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1378 }
1379
1380 static int handle_lctlg(struct kvm_vcpu *vcpu)
1381 {
1382         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1383         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1384         int reg, rc, nr_regs;
1385         u64 ctl_array[16];
1386         u64 ga;
1387         u8 ar;
1388
1389         vcpu->stat.instruction_lctlg++;
1390
1391         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1392                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1393
1394         ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1395
1396         if (ga & 7)
1397                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1398
1399         VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1400         trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga);
1401
1402         nr_regs = ((reg3 - reg1) & 0xf) + 1;
1403         rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1404         if (rc)
1405                 return kvm_s390_inject_prog_cond(vcpu, rc);
1406         reg = reg1;
1407         nr_regs = 0;
1408         do {
1409                 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++];
1410                 if (reg == reg3)
1411                         break;
1412                 reg = (reg + 1) % 16;
1413         } while (1);
1414         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1415         return 0;
1416 }
1417
1418 static int handle_stctg(struct kvm_vcpu *vcpu)
1419 {
1420         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1421         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1422         int reg, rc, nr_regs;
1423         u64 ctl_array[16];
1424         u64 ga;
1425         u8 ar;
1426
1427         vcpu->stat.instruction_stctg++;
1428
1429         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1430                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1431
1432         ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1433
1434         if (ga & 7)
1435                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1436
1437         VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1438         trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga);
1439
1440         reg = reg1;
1441         nr_regs = 0;
1442         do {
1443                 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1444                 if (reg == reg3)
1445                         break;
1446                 reg = (reg + 1) % 16;
1447         } while (1);
1448         rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1449         return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1450 }
1451
1452 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
1453 {
1454         switch (vcpu->arch.sie_block->ipb & 0x000000ff) {
1455         case 0x25:
1456                 return handle_stctg(vcpu);
1457         case 0x2f:
1458                 return handle_lctlg(vcpu);
1459         case 0x60:
1460         case 0x61:
1461         case 0x62:
1462                 return handle_ri(vcpu);
1463         default:
1464                 return -EOPNOTSUPP;
1465         }
1466 }
1467
1468 static int handle_tprot(struct kvm_vcpu *vcpu)
1469 {
1470         u64 address, operand2;
1471         unsigned long gpa;
1472         u8 access_key;
1473         bool writable;
1474         int ret, cc;
1475         u8 ar;
1476
1477         vcpu->stat.instruction_tprot++;
1478
1479         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1480                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1481
1482         kvm_s390_get_base_disp_sse(vcpu, &address, &operand2, &ar, NULL);
1483         access_key = (operand2 & 0xf0) >> 4;
1484
1485         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1486                 ipte_lock(vcpu->kvm);
1487
1488         ret = guest_translate_address_with_key(vcpu, address, ar, &gpa,
1489                                                GACC_STORE, access_key);
1490         if (ret == 0) {
1491                 gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable);
1492         } else if (ret == PGM_PROTECTION) {
1493                 writable = false;
1494                 /* Write protected? Try again with read-only... */
1495                 ret = guest_translate_address_with_key(vcpu, address, ar, &gpa,
1496                                                        GACC_FETCH, access_key);
1497         }
1498         if (ret >= 0) {
1499                 cc = -1;
1500
1501                 /* Fetching permitted; storing permitted */
1502                 if (ret == 0 && writable)
1503                         cc = 0;
1504                 /* Fetching permitted; storing not permitted */
1505                 else if (ret == 0 && !writable)
1506                         cc = 1;
1507                 /* Fetching not permitted; storing not permitted */
1508                 else if (ret == PGM_PROTECTION)
1509                         cc = 2;
1510                 /* Translation not available */
1511                 else if (ret != PGM_ADDRESSING && ret != PGM_TRANSLATION_SPEC)
1512                         cc = 3;
1513
1514                 if (cc != -1) {
1515                         kvm_s390_set_psw_cc(vcpu, cc);
1516                         ret = 0;
1517                 } else {
1518                         ret = kvm_s390_inject_program_int(vcpu, ret);
1519                 }
1520         }
1521
1522         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1523                 ipte_unlock(vcpu->kvm);
1524         return ret;
1525 }
1526
1527 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
1528 {
1529         switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1530         case 0x01:
1531                 return handle_tprot(vcpu);
1532         default:
1533                 return -EOPNOTSUPP;
1534         }
1535 }
1536
1537 static int handle_sckpf(struct kvm_vcpu *vcpu)
1538 {
1539         u32 value;
1540
1541         vcpu->stat.instruction_sckpf++;
1542
1543         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1544                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1545
1546         if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
1547                 return kvm_s390_inject_program_int(vcpu,
1548                                                    PGM_SPECIFICATION);
1549
1550         value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
1551         vcpu->arch.sie_block->todpr = value;
1552
1553         return 0;
1554 }
1555
1556 static int handle_ptff(struct kvm_vcpu *vcpu)
1557 {
1558         vcpu->stat.instruction_ptff++;
1559
1560         /* we don't emulate any control instructions yet */
1561         kvm_s390_set_psw_cc(vcpu, 3);
1562         return 0;
1563 }
1564
1565 int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
1566 {
1567         switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1568         case 0x04:
1569                 return handle_ptff(vcpu);
1570         case 0x07:
1571                 return handle_sckpf(vcpu);
1572         default:
1573                 return -EOPNOTSUPP;
1574         }
1575 }