arch/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 <[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/mm_types.h>
  15 #include <linux/pgtable.h>
  16 #include <linux/io.h>
  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/ptrace.h>
  26 #include <asm/sclp.h>
  27 #include <asm/ap.h>
  28 #include "gaccess.h"
  29 #include "kvm-s390.h"
  30 #include "trace.h"
  31
  32 static int handle_ri(struct kvm_vcpu *vcpu)
  33 {
  34         vcpu->stat.instruction_ri++;
  35
  36         if (test_kvm_facility(vcpu->kvm, 64)) {
  37                 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (lazy)");
  38                 vcpu->arch.sie_block->ecb3 |= ECB3_RI;
  39                 kvm_s390_retry_instr(vcpu);
  40                 return 0;
  41         } else
  42                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
  43 }
  44
  45 int kvm_s390_handle_aa(struct kvm_vcpu *vcpu)
  46 {
  47         if ((vcpu->arch.sie_block->ipa & 0xf) <= 4)
  48                 return handle_ri(vcpu);
  49         else
  50                 return -EOPNOTSUPP;
  51 }
  52
  53 static int handle_gs(struct kvm_vcpu *vcpu)
  54 {
  55         vcpu->stat.instruction_gs++;
  56
  57         if (test_kvm_facility(vcpu->kvm, 133)) {
  58                 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (lazy)");
  59                 preempt_disable();
  60                 local_ctl_set_bit(2, CR2_GUARDED_STORAGE_BIT);
  61                 current->thread.gs_cb = (struct gs_cb *)&vcpu->run->s.regs.gscb;
  62                 restore_gs_cb(current->thread.gs_cb);
  63                 preempt_enable();
  64                 vcpu->arch.sie_block->ecb |= ECB_GS;
  65                 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
  66                 vcpu->arch.gs_enabled = 1;
  67                 kvm_s390_retry_instr(vcpu);
  68                 return 0;
  69         } else
  70                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
  71 }
  72
  73 int kvm_s390_handle_e3(struct kvm_vcpu *vcpu)
  74 {
  75         int code = vcpu->arch.sie_block->ipb & 0xff;
  76
  77         if (code == 0x49 || code == 0x4d)
  78                 return handle_gs(vcpu);
  79         else
  80                 return -EOPNOTSUPP;
  81 }
  82 /* Handle SCK (SET CLOCK) interception */
  83 static int handle_set_clock(struct kvm_vcpu *vcpu)
  84 {
  85         struct kvm_s390_vm_tod_clock gtod = { 0 };
  86         int rc;
  87         u8 ar;
  88         u64 op2;
  89
  90         vcpu->stat.instruction_sck++;
  91
  92         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
  93                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
  94
  95         op2 = kvm_s390_get_base_disp_s(vcpu, &ar);
  96         if (op2 & 7)    /* Operand must be on a doubleword boundary */
  97                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
  98         rc = read_guest(vcpu, op2, ar, &gtod.tod, sizeof(gtod.tod));
  99         if (rc)
 100                 return kvm_s390_inject_prog_cond(vcpu, rc);
 101
 102         VCPU_EVENT(vcpu, 3, "SCK: setting guest TOD to 0x%llx", gtod.tod);
 103         /*
 104          * To set the TOD clock the kvm lock must be taken, but the vcpu lock
 105          * is already held in handle_set_clock. The usual lock order is the
 106          * opposite.  As SCK is deprecated and should not be used in several
 107          * cases, for example when the multiple epoch facility or TOD clock
 108          * steering facility is installed (see Principles of Operation),  a
 109          * slow path can be used.  If the lock can not be taken via try_lock,
 110          * the instruction will be retried via -EAGAIN at a later point in
 111          * time.
 112          */
 113         if (!kvm_s390_try_set_tod_clock(vcpu->kvm, &gtod)) {
 114                 kvm_s390_retry_instr(vcpu);
 115                 return -EAGAIN;
 116         }
 117
 118         kvm_s390_set_psw_cc(vcpu, 0);
 119         return 0;
 120 }
 121
 122 static int handle_set_prefix(struct kvm_vcpu *vcpu)
 123 {
 124         u64 operand2;
 125         u32 address;
 126         int rc;
 127         u8 ar;
 128
 129         vcpu->stat.instruction_spx++;
 130
 131         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 132                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 133
 134         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 135
 136         /* must be word boundary */
 137         if (operand2 & 3)
 138                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 139
 140         /* get the value */
 141         rc = read_guest(vcpu, operand2, ar, &address, sizeof(address));
 142         if (rc)
 143                 return kvm_s390_inject_prog_cond(vcpu, rc);
 144
 145         address &= 0x7fffe000u;
 146
 147         /*
 148          * Make sure the new value is valid memory. We only need to check the
 149          * first page, since address is 8k aligned and memory pieces are always
 150          * at least 1MB aligned and have at least a size of 1MB.
 151          */
 152         if (!kvm_is_gpa_in_memslot(vcpu->kvm, address))
 153                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 154
 155         kvm_s390_set_prefix(vcpu, address);
 156         trace_kvm_s390_handle_prefix(vcpu, 1, address);
 157         return 0;
 158 }
 159
 160 static int handle_store_prefix(struct kvm_vcpu *vcpu)
 161 {
 162         u64 operand2;
 163         u32 address;
 164         int rc;
 165         u8 ar;
 166
 167         vcpu->stat.instruction_stpx++;
 168
 169         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 170                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 171
 172         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 173
 174         /* must be word boundary */
 175         if (operand2 & 3)
 176                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 177
 178         address = kvm_s390_get_prefix(vcpu);
 179
 180         /* get the value */
 181         rc = write_guest(vcpu, operand2, ar, &address, sizeof(address));
 182         if (rc)
 183                 return kvm_s390_inject_prog_cond(vcpu, rc);
 184
 185         VCPU_EVENT(vcpu, 3, "STPX: storing prefix 0x%x into 0x%llx", address, operand2);
 186         trace_kvm_s390_handle_prefix(vcpu, 0, address);
 187         return 0;
 188 }
 189
 190 static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
 191 {
 192         u16 vcpu_id = vcpu->vcpu_id;
 193         u64 ga;
 194         int rc;
 195         u8 ar;
 196
 197         vcpu->stat.instruction_stap++;
 198
 199         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 200                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 201
 202         ga = kvm_s390_get_base_disp_s(vcpu, &ar);
 203
 204         if (ga & 1)
 205                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 206
 207         rc = write_guest(vcpu, ga, ar, &vcpu_id, sizeof(vcpu_id));
 208         if (rc)
 209                 return kvm_s390_inject_prog_cond(vcpu, rc);
 210
 211         VCPU_EVENT(vcpu, 3, "STAP: storing cpu address (%u) to 0x%llx", vcpu_id, ga);
 212         trace_kvm_s390_handle_stap(vcpu, ga);
 213         return 0;
 214 }
 215
 216 int kvm_s390_skey_check_enable(struct kvm_vcpu *vcpu)
 217 {
 218         int rc;
 219
 220         trace_kvm_s390_skey_related_inst(vcpu);
 221         /* Already enabled? */
 222         if (vcpu->arch.skey_enabled)
 223                 return 0;
 224
 225         rc = s390_enable_skey();
 226         VCPU_EVENT(vcpu, 3, "enabling storage keys for guest: %d", rc);
 227         if (rc)
 228                 return rc;
 229
 230         if (kvm_s390_test_cpuflags(vcpu, CPUSTAT_KSS))
 231                 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_KSS);
 232         if (!vcpu->kvm->arch.use_skf)
 233                 vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
 234         else
 235                 vcpu->arch.sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | ICTL_RRBE);
 236         vcpu->arch.skey_enabled = true;
 237         return 0;
 238 }
 239
 240 static int try_handle_skey(struct kvm_vcpu *vcpu)
 241 {
 242         int rc;
 243
 244         rc = kvm_s390_skey_check_enable(vcpu);
 245         if (rc)
 246                 return rc;
 247         if (vcpu->kvm->arch.use_skf) {
 248                 /* with storage-key facility, SIE interprets it for us */
 249                 kvm_s390_retry_instr(vcpu);
 250                 VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
 251                 return -EAGAIN;
 252         }
 253         return 0;
 254 }
 255
 256 static int handle_iske(struct kvm_vcpu *vcpu)
 257 {
 258         unsigned long gaddr, vmaddr;
 259         unsigned char key;
 260         int reg1, reg2;
 261         bool unlocked;
 262         int rc;
 263
 264         vcpu->stat.instruction_iske++;
 265
 266         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 267                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 268
 269         rc = try_handle_skey(vcpu);
 270         if (rc)
 271                 return rc != -EAGAIN ? rc : 0;
 272
 273         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 274
 275         gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 276         gaddr = kvm_s390_logical_to_effective(vcpu, gaddr);
 277         gaddr = kvm_s390_real_to_abs(vcpu, gaddr);
 278         vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr));
 279         if (kvm_is_error_hva(vmaddr))
 280                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 281 retry:
 282         unlocked = false;
 283         mmap_read_lock(current->mm);
 284         rc = get_guest_storage_key(current->mm, vmaddr, &key);
 285
 286         if (rc) {
 287                 rc = fixup_user_fault(current->mm, vmaddr,
 288                                       FAULT_FLAG_WRITE, &unlocked);
 289                 if (!rc) {
 290                         mmap_read_unlock(current->mm);
 291                         goto retry;
 292                 }
 293         }
 294         mmap_read_unlock(current->mm);
 295         if (rc == -EFAULT)
 296                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 297         if (rc < 0)
 298                 return rc;
 299         vcpu->run->s.regs.gprs[reg1] &= ~0xff;
 300         vcpu->run->s.regs.gprs[reg1] |= key;
 301         return 0;
 302 }
 303
 304 static int handle_rrbe(struct kvm_vcpu *vcpu)
 305 {
 306         unsigned long vmaddr, gaddr;
 307         int reg1, reg2;
 308         bool unlocked;
 309         int rc;
 310
 311         vcpu->stat.instruction_rrbe++;
 312
 313         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 314                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 315
 316         rc = try_handle_skey(vcpu);
 317         if (rc)
 318                 return rc != -EAGAIN ? rc : 0;
 319
 320         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 321
 322         gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 323         gaddr = kvm_s390_logical_to_effective(vcpu, gaddr);
 324         gaddr = kvm_s390_real_to_abs(vcpu, gaddr);
 325         vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr));
 326         if (kvm_is_error_hva(vmaddr))
 327                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 328 retry:
 329         unlocked = false;
 330         mmap_read_lock(current->mm);
 331         rc = reset_guest_reference_bit(current->mm, vmaddr);
 332         if (rc < 0) {
 333                 rc = fixup_user_fault(current->mm, vmaddr,
 334                                       FAULT_FLAG_WRITE, &unlocked);
 335                 if (!rc) {
 336                         mmap_read_unlock(current->mm);
 337                         goto retry;
 338                 }
 339         }
 340         mmap_read_unlock(current->mm);
 341         if (rc == -EFAULT)
 342                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 343         if (rc < 0)
 344                 return rc;
 345         kvm_s390_set_psw_cc(vcpu, rc);
 346         return 0;
 347 }
 348
 349 #define SSKE_NQ 0x8
 350 #define SSKE_MR 0x4
 351 #define SSKE_MC 0x2
 352 #define SSKE_MB 0x1
 353 static int handle_sske(struct kvm_vcpu *vcpu)
 354 {
 355         unsigned char m3 = vcpu->arch.sie_block->ipb >> 28;
 356         unsigned long start, end;
 357         unsigned char key, oldkey;
 358         int reg1, reg2;
 359         bool unlocked;
 360         int rc;
 361
 362         vcpu->stat.instruction_sske++;
 363
 364         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 365                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 366
 367         rc = try_handle_skey(vcpu);
 368         if (rc)
 369                 return rc != -EAGAIN ? rc : 0;
 370
 371         if (!test_kvm_facility(vcpu->kvm, 8))
 372                 m3 &= ~SSKE_MB;
 373         if (!test_kvm_facility(vcpu->kvm, 10))
 374                 m3 &= ~(SSKE_MC | SSKE_MR);
 375         if (!test_kvm_facility(vcpu->kvm, 14))
 376                 m3 &= ~SSKE_NQ;
 377
 378         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 379
 380         key = vcpu->run->s.regs.gprs[reg1] & 0xfe;
 381         start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 382         start = kvm_s390_logical_to_effective(vcpu, start);
 383         if (m3 & SSKE_MB) {
 384                 /* start already designates an absolute address */
 385                 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
 386         } else {
 387                 start = kvm_s390_real_to_abs(vcpu, start);
 388                 end = start + PAGE_SIZE;
 389         }
 390
 391         while (start != end) {
 392                 unsigned long vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
 393                 unlocked = false;
 394
 395                 if (kvm_is_error_hva(vmaddr))
 396                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 397
 398                 mmap_read_lock(current->mm);
 399                 rc = cond_set_guest_storage_key(current->mm, vmaddr, key, &oldkey,
 400                                                 m3 & SSKE_NQ, m3 & SSKE_MR,
 401                                                 m3 & SSKE_MC);
 402
 403                 if (rc < 0) {
 404                         rc = fixup_user_fault(current->mm, vmaddr,
 405                                               FAULT_FLAG_WRITE, &unlocked);
 406                         rc = !rc ? -EAGAIN : rc;
 407                 }
 408                 mmap_read_unlock(current->mm);
 409                 if (rc == -EFAULT)
 410                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 411                 if (rc == -EAGAIN)
 412                         continue;
 413                 if (rc < 0)
 414                         return rc;
 415                 start += PAGE_SIZE;
 416         }
 417
 418         if (m3 & (SSKE_MC | SSKE_MR)) {
 419                 if (m3 & SSKE_MB) {
 420                         /* skey in reg1 is unpredictable */
 421                         kvm_s390_set_psw_cc(vcpu, 3);
 422                 } else {
 423                         kvm_s390_set_psw_cc(vcpu, rc);
 424                         vcpu->run->s.regs.gprs[reg1] &= ~0xff00UL;
 425                         vcpu->run->s.regs.gprs[reg1] |= (u64) oldkey << 8;
 426                 }
 427         }
 428         if (m3 & SSKE_MB) {
 429                 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT)
 430                         vcpu->run->s.regs.gprs[reg2] &= ~PAGE_MASK;
 431                 else
 432                         vcpu->run->s.regs.gprs[reg2] &= ~0xfffff000UL;
 433                 end = kvm_s390_logical_to_effective(vcpu, end);
 434                 vcpu->run->s.regs.gprs[reg2] |= end;
 435         }
 436         return 0;
 437 }
 438
 439 static int handle_ipte_interlock(struct kvm_vcpu *vcpu)
 440 {
 441         vcpu->stat.instruction_ipte_interlock++;
 442         if (psw_bits(vcpu->arch.sie_block->gpsw).pstate)
 443                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 444         wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu->kvm));
 445         kvm_s390_retry_instr(vcpu);
 446         VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation");
 447         return 0;
 448 }
 449
 450 static int handle_test_block(struct kvm_vcpu *vcpu)
 451 {
 452         gpa_t addr;
 453         int reg2;
 454
 455         vcpu->stat.instruction_tb++;
 456
 457         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 458                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 459
 460         kvm_s390_get_regs_rre(vcpu, NULL, &reg2);
 461         addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 462         addr = kvm_s390_logical_to_effective(vcpu, addr);
 463         if (kvm_s390_check_low_addr_prot_real(vcpu, addr))
 464                 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
 465         addr = kvm_s390_real_to_abs(vcpu, addr);
 466
 467         if (!kvm_is_gpa_in_memslot(vcpu->kvm, addr))
 468                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 469         /*
 470          * We don't expect errors on modern systems, and do not care
 471          * about storage keys (yet), so let's just clear the page.
 472          */
 473         if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE))
 474                 return -EFAULT;
 475         kvm_s390_set_psw_cc(vcpu, 0);
 476         vcpu->run->s.regs.gprs[0] = 0;
 477         return 0;
 478 }
 479
 480 static int handle_tpi(struct kvm_vcpu *vcpu)
 481 {
 482         struct kvm_s390_interrupt_info *inti;
 483         unsigned long len;
 484         u32 tpi_data[3];
 485         int rc;
 486         u64 addr;
 487         u8 ar;
 488
 489         vcpu->stat.instruction_tpi++;
 490
 491         addr = kvm_s390_get_base_disp_s(vcpu, &ar);
 492         if (addr & 3)
 493                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 494
 495         inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0);
 496         if (!inti) {
 497                 kvm_s390_set_psw_cc(vcpu, 0);
 498                 return 0;
 499         }
 500
 501         tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr;
 502         tpi_data[1] = inti->io.io_int_parm;
 503         tpi_data[2] = inti->io.io_int_word;
 504         if (addr) {
 505                 /*
 506                  * Store the two-word I/O interruption code into the
 507                  * provided area.
 508                  */
 509                 len = sizeof(tpi_data) - 4;
 510                 rc = write_guest(vcpu, addr, ar, &tpi_data, len);
 511                 if (rc) {
 512                         rc = kvm_s390_inject_prog_cond(vcpu, rc);
 513                         goto reinject_interrupt;
 514                 }
 515         } else {
 516                 /*
 517                  * Store the three-word I/O interruption code into
 518                  * the appropriate lowcore area.
 519                  */
 520                 len = sizeof(tpi_data);
 521                 if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) {
 522                         /* failed writes to the low core are not recoverable */
 523                         rc = -EFAULT;
 524                         goto reinject_interrupt;
 525                 }
 526         }
 527
 528         /* irq was successfully handed to the guest */
 529         kfree(inti);
 530         kvm_s390_set_psw_cc(vcpu, 1);
 531         return 0;
 532 reinject_interrupt:
 533         /*
 534          * If we encounter a problem storing the interruption code, the
 535          * instruction is suppressed from the guest's view: reinject the
 536          * interrupt.
 537          */
 538         if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) {
 539                 kfree(inti);
 540                 rc = -EFAULT;
 541         }
 542         /* don't set the cc, a pgm irq was injected or we drop to user space */
 543         return rc ? -EFAULT : 0;
 544 }
 545
 546 static int handle_tsch(struct kvm_vcpu *vcpu)
 547 {
 548         struct kvm_s390_interrupt_info *inti = NULL;
 549         const u64 isc_mask = 0xffUL << 24; /* all iscs set */
 550
 551         vcpu->stat.instruction_tsch++;
 552
 553         /* a valid schid has at least one bit set */
 554         if (vcpu->run->s.regs.gprs[1])
 555                 inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask,
 556                                            vcpu->run->s.regs.gprs[1]);
 557
 558         /*
 559          * Prepare exit to userspace.
 560          * We indicate whether we dequeued a pending I/O interrupt
 561          * so that userspace can re-inject it if the instruction gets
 562          * a program check. While this may re-order the pending I/O
 563          * interrupts, this is no problem since the priority is kept
 564          * intact.
 565          */
 566         vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
 567         vcpu->run->s390_tsch.dequeued = !!inti;
 568         if (inti) {
 569                 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
 570                 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
 571                 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
 572                 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
 573         }
 574         vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
 575         kfree(inti);
 576         return -EREMOTE;
 577 }
 578
 579 static int handle_io_inst(struct kvm_vcpu *vcpu)
 580 {
 581         VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
 582
 583         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 584                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 585
 586         if (vcpu->kvm->arch.css_support) {
 587                 /*
 588                  * Most I/O instructions will be handled by userspace.
 589                  * Exceptions are tpi and the interrupt portion of tsch.
 590                  */
 591                 if (vcpu->arch.sie_block->ipa == 0xb236)
 592                         return handle_tpi(vcpu);
 593                 if (vcpu->arch.sie_block->ipa == 0xb235)
 594                         return handle_tsch(vcpu);
 595                 /* Handle in userspace. */
 596                 vcpu->stat.instruction_io_other++;
 597                 return -EOPNOTSUPP;
 598         } else {
 599                 /*
 600                  * Set condition code 3 to stop the guest from issuing channel
 601                  * I/O instructions.
 602                  */
 603                 kvm_s390_set_psw_cc(vcpu, 3);
 604                 return 0;
 605         }
 606 }
 607
 608 /*
 609  * handle_pqap: Handling pqap interception
 610  * @vcpu: the vcpu having issue the pqap instruction
 611  *
 612  * We now support PQAP/AQIC instructions and we need to correctly
 613  * answer the guest even if no dedicated driver's hook is available.
 614  *
 615  * The intercepting code calls a dedicated callback for this instruction
 616  * if a driver did register one in the CRYPTO satellite of the
 617  * SIE block.
 618  *
 619  * If no callback is available, the queues are not available, return this
 620  * response code to the caller and set CC to 3.
 621  * Else return the response code returned by the callback.
 622  */
 623 static int handle_pqap(struct kvm_vcpu *vcpu)
 624 {
 625         struct ap_queue_status status = {};
 626         crypto_hook pqap_hook;
 627         unsigned long reg0;
 628         int ret;
 629         uint8_t fc;
 630
 631         /* Verify that the AP instruction are available */
 632         if (!ap_instructions_available())
 633                 return -EOPNOTSUPP;
 634         /* Verify that the guest is allowed to use AP instructions */
 635         if (!(vcpu->arch.sie_block->eca & ECA_APIE))
 636                 return -EOPNOTSUPP;
 637         /*
 638          * The only possibly intercepted functions when AP instructions are
 639          * available for the guest are AQIC and TAPQ with the t bit set
 640          * since we do not set IC.3 (FIII) we currently will only intercept
 641          * the AQIC function code.
 642          * Note: running nested under z/VM can result in intercepts for other
 643          * function codes, e.g. PQAP(QCI). We do not support this and bail out.
 644          */
 645         reg0 = vcpu->run->s.regs.gprs[0];
 646         fc = (reg0 >> 24) & 0xff;
 647         if (fc != 0x03)
 648                 return -EOPNOTSUPP;
 649
 650         /* PQAP instruction is allowed for guest kernel only */
 651         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 652                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 653
 654         /* Common PQAP instruction specification exceptions */
 655         /* bits 41-47 must all be zeros */
 656         if (reg0 & 0x007f0000UL)
 657                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 658         /* APFT not install and T bit set */
 659         if (!test_kvm_facility(vcpu->kvm, 15) && (reg0 & 0x00800000UL))
 660                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 661         /* APXA not installed and APID greater 64 or APQI greater 16 */
 662         if (!(vcpu->kvm->arch.crypto.crycbd & 0x02) && (reg0 & 0x0000c0f0UL))
 663                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 664
 665         /* AQIC function code specific exception */
 666         /* facility 65 not present for AQIC function code */
 667         if (!test_kvm_facility(vcpu->kvm, 65))
 668                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 669
 670         /*
 671          * If the hook callback is registered, there will be a pointer to the
 672          * hook function pointer in the kvm_s390_crypto structure. Lock the
 673          * owner, retrieve the hook function pointer and call the hook.
 674          */
 675         down_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem);
 676         if (vcpu->kvm->arch.crypto.pqap_hook) {
 677                 pqap_hook = *vcpu->kvm->arch.crypto.pqap_hook;
 678                 ret = pqap_hook(vcpu);
 679                 if (!ret) {
 680                         if (vcpu->run->s.regs.gprs[1] & 0x00ff0000)
 681                                 kvm_s390_set_psw_cc(vcpu, 3);
 682                         else
 683                                 kvm_s390_set_psw_cc(vcpu, 0);
 684                 }
 685                 up_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem);
 686                 return ret;
 687         }
 688         up_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem);
 689         /*
 690          * A vfio_driver must register a hook.
 691          * No hook means no driver to enable the SIE CRYCB and no queues.
 692          * We send this response to the guest.
 693          */
 694         status.response_code = 0x01;
 695         memcpy(&vcpu->run->s.regs.gprs[1], &status, sizeof(status));
 696         kvm_s390_set_psw_cc(vcpu, 3);
 697         return 0;
 698 }
 699
 700 static int handle_stfl(struct kvm_vcpu *vcpu)
 701 {
 702         int rc;
 703         unsigned int fac;
 704
 705         vcpu->stat.instruction_stfl++;
 706
 707         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 708                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 709
 710         /*
 711          * We need to shift the lower 32 facility bits (bit 0-31) from a u64
 712          * into a u32 memory representation. They will remain bits 0-31.
 713          */
 714         fac = *vcpu->kvm->arch.model.fac_list >> 32;
 715         rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list),
 716                             &fac, sizeof(fac));
 717         if (rc)
 718                 return rc;
 719         VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac);
 720         trace_kvm_s390_handle_stfl(vcpu, fac);
 721         return 0;
 722 }
 723
 724 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
 725 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
 726 #define PSW_ADDR_24 0x0000000000ffffffUL
 727 #define PSW_ADDR_31 0x000000007fffffffUL
 728
 729 int is_valid_psw(psw_t *psw)
 730 {
 731         if (psw->mask & PSW_MASK_UNASSIGNED)
 732                 return 0;
 733         if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
 734                 if (psw->addr & ~PSW_ADDR_31)
 735                         return 0;
 736         }
 737         if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
 738                 return 0;
 739         if ((psw->mask & PSW_MASK_ADDR_MODE) ==  PSW_MASK_EA)
 740                 return 0;
 741         if (psw->addr & 1)
 742                 return 0;
 743         return 1;
 744 }
 745
 746 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
 747 {
 748         psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
 749         psw_compat_t new_psw;
 750         u64 addr;
 751         int rc;
 752         u8 ar;
 753
 754         vcpu->stat.instruction_lpsw++;
 755
 756         if (gpsw->mask & PSW_MASK_PSTATE)
 757                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 758
 759         addr = kvm_s390_get_base_disp_s(vcpu, &ar);
 760         if (addr & 7)
 761                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 762
 763         rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
 764         if (rc)
 765                 return kvm_s390_inject_prog_cond(vcpu, rc);
 766         if (!(new_psw.mask & PSW32_MASK_BASE))
 767                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 768         gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
 769         gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
 770         gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
 771         if (!is_valid_psw(gpsw))
 772                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 773         return 0;
 774 }
 775
 776 static int handle_lpswe(struct kvm_vcpu *vcpu)
 777 {
 778         psw_t new_psw;
 779         u64 addr;
 780         int rc;
 781         u8 ar;
 782
 783         vcpu->stat.instruction_lpswe++;
 784
 785         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 786                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 787
 788         addr = kvm_s390_get_base_disp_s(vcpu, &ar);
 789         if (addr & 7)
 790                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 791         rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
 792         if (rc)
 793                 return kvm_s390_inject_prog_cond(vcpu, rc);
 794         vcpu->arch.sie_block->gpsw = new_psw;
 795         if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
 796                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 797         return 0;
 798 }
 799
 800 static int handle_lpswey(struct kvm_vcpu *vcpu)
 801 {
 802         psw_t new_psw;
 803         u64 addr;
 804         int rc;
 805         u8 ar;
 806
 807         vcpu->stat.instruction_lpswey++;
 808
 809         if (!test_kvm_facility(vcpu->kvm, 193))
 810                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
 811
 812         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 813                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 814
 815         addr = kvm_s390_get_base_disp_siy(vcpu, &ar);
 816         if (addr & 7)
 817                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 818
 819         rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
 820         if (rc)
 821                 return kvm_s390_inject_prog_cond(vcpu, rc);
 822
 823         vcpu->arch.sie_block->gpsw = new_psw;
 824         if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
 825                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 826
 827         return 0;
 828 }
 829
 830 static int handle_stidp(struct kvm_vcpu *vcpu)
 831 {
 832         u64 stidp_data = vcpu->kvm->arch.model.cpuid;
 833         u64 operand2;
 834         int rc;
 835         u8 ar;
 836
 837         vcpu->stat.instruction_stidp++;
 838
 839         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 840                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 841
 842         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 843
 844         if (operand2 & 7)
 845                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 846
 847         rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data));
 848         if (rc)
 849                 return kvm_s390_inject_prog_cond(vcpu, rc);
 850
 851         VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data);
 852         return 0;
 853 }
 854
 855 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
 856 {
 857         int cpus = 0;
 858         int n;
 859
 860         cpus = atomic_read(&vcpu->kvm->online_vcpus);
 861
 862         /* deal with other level 3 hypervisors */
 863         if (stsi(mem, 3, 2, 2))
 864                 mem->count = 0;
 865         if (mem->count < 8)
 866                 mem->count++;
 867         for (n = mem->count - 1; n > 0 ; n--)
 868                 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
 869
 870         memset(&mem->vm[0], 0, sizeof(mem->vm[0]));
 871         mem->vm[0].cpus_total = cpus;
 872         mem->vm[0].cpus_configured = cpus;
 873         mem->vm[0].cpus_standby = 0;
 874         mem->vm[0].cpus_reserved = 0;
 875         mem->vm[0].caf = 1000;
 876         memcpy(mem->vm[0].name, "KVMguest", 8);
 877         ASCEBC(mem->vm[0].name, 8);
 878         memcpy(mem->vm[0].cpi, "KVM/Linux       ", 16);
 879         ASCEBC(mem->vm[0].cpi, 16);
 880 }
 881
 882 static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, u8 ar,
 883                                  u8 fc, u8 sel1, u16 sel2)
 884 {
 885         vcpu->run->exit_reason = KVM_EXIT_S390_STSI;
 886         vcpu->run->s390_stsi.addr = addr;
 887         vcpu->run->s390_stsi.ar = ar;
 888         vcpu->run->s390_stsi.fc = fc;
 889         vcpu->run->s390_stsi.sel1 = sel1;
 890         vcpu->run->s390_stsi.sel2 = sel2;
 891 }
 892
 893 static int handle_stsi(struct kvm_vcpu *vcpu)
 894 {
 895         int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
 896         int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
 897         int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
 898         unsigned long mem = 0;
 899         u64 operand2;
 900         int rc = 0;
 901         u8 ar;
 902
 903         vcpu->stat.instruction_stsi++;
 904         VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2);
 905
 906         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 907                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 908
 909         /* Bailout forbidden function codes */
 910         if (fc > 3 && fc != 15)
 911                 goto out_no_data;
 912
 913         /*
 914          * fc 15 is provided only with
 915          *   - PTF/CPU topology support through facility 15
 916          *   - KVM_CAP_S390_USER_STSI
 917          */
 918         if (fc == 15 && (!test_kvm_facility(vcpu->kvm, 11) ||
 919                          !vcpu->kvm->arch.user_stsi))
 920                 goto out_no_data;
 921
 922         if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
 923             || vcpu->run->s.regs.gprs[1] & 0xffff0000)
 924                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 925
 926         if (fc == 0) {
 927                 vcpu->run->s.regs.gprs[0] = 3 << 28;
 928                 kvm_s390_set_psw_cc(vcpu, 0);
 929                 return 0;
 930         }
 931
 932         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 933
 934         if (!kvm_s390_pv_cpu_is_protected(vcpu) && (operand2 & 0xfff))
 935                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 936
 937         switch (fc) {
 938         case 1: /* same handling for 1 and 2 */
 939         case 2:
 940                 mem = get_zeroed_page(GFP_KERNEL_ACCOUNT);
 941                 if (!mem)
 942                         goto out_no_data;
 943                 if (stsi((void *) mem, fc, sel1, sel2))
 944                         goto out_no_data;
 945                 break;
 946         case 3:
 947                 if (sel1 != 2 || sel2 != 2)
 948                         goto out_no_data;
 949                 mem = get_zeroed_page(GFP_KERNEL_ACCOUNT);
 950                 if (!mem)
 951                         goto out_no_data;
 952                 handle_stsi_3_2_2(vcpu, (void *) mem);
 953                 break;
 954         case 15: /* fc 15 is fully handled in userspace */
 955                 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
 956                 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
 957                 return -EREMOTE;
 958         }
 959         if (kvm_s390_pv_cpu_is_protected(vcpu)) {
 960                 memcpy(sida_addr(vcpu->arch.sie_block), (void *)mem, PAGE_SIZE);
 961                 rc = 0;
 962         } else {
 963                 rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE);
 964         }
 965         if (rc) {
 966                 rc = kvm_s390_inject_prog_cond(vcpu, rc);
 967                 goto out;
 968         }
 969         if (vcpu->kvm->arch.user_stsi) {
 970                 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
 971                 rc = -EREMOTE;
 972         }
 973         trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
 974         free_page(mem);
 975         kvm_s390_set_psw_cc(vcpu, 0);
 976         vcpu->run->s.regs.gprs[0] = 0;
 977         return rc;
 978 out_no_data:
 979         kvm_s390_set_psw_cc(vcpu, 3);
 980 out:
 981         free_page(mem);
 982         return rc;
 983 }
 984
 985 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
 986 {
 987         switch (vcpu->arch.sie_block->ipa & 0x00ff) {
 988         case 0x02:
 989                 return handle_stidp(vcpu);
 990         case 0x04:
 991                 return handle_set_clock(vcpu);
 992         case 0x10:
 993                 return handle_set_prefix(vcpu);
 994         case 0x11:
 995                 return handle_store_prefix(vcpu);
 996         case 0x12:
 997                 return handle_store_cpu_address(vcpu);
 998         case 0x14:
 999                 return kvm_s390_handle_vsie(vcpu);
1000         case 0x21:
1001         case 0x50:
1002                 return handle_ipte_interlock(vcpu);
1003         case 0x29:
1004                 return handle_iske(vcpu);
1005         case 0x2a:
1006                 return handle_rrbe(vcpu);
1007         case 0x2b:
1008                 return handle_sske(vcpu);
1009         case 0x2c:
1010                 return handle_test_block(vcpu);
1011         case 0x30:
1012         case 0x31:
1013         case 0x32:
1014         case 0x33:
1015         case 0x34:
1016         case 0x35:
1017         case 0x36:
1018         case 0x37:
1019         case 0x38:
1020         case 0x39:
1021         case 0x3a:
1022         case 0x3b:
1023         case 0x3c:
1024         case 0x5f:
1025         case 0x74:
1026         case 0x76:
1027                 return handle_io_inst(vcpu);
1028         case 0x56:
1029                 return handle_sthyi(vcpu);
1030         case 0x7d:
1031                 return handle_stsi(vcpu);
1032         case 0xaf:
1033                 return handle_pqap(vcpu);
1034         case 0xb1:
1035                 return handle_stfl(vcpu);
1036         case 0xb2:
1037                 return handle_lpswe(vcpu);
1038         default:
1039                 return -EOPNOTSUPP;
1040         }
1041 }
1042
1043 static int handle_epsw(struct kvm_vcpu *vcpu)
1044 {
1045         int reg1, reg2;
1046
1047         vcpu->stat.instruction_epsw++;
1048
1049         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
1050
1051         /* This basically extracts the mask half of the psw. */
1052         vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
1053         vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
1054         if (reg2) {
1055                 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
1056                 vcpu->run->s.regs.gprs[reg2] |=
1057                         vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
1058         }
1059         return 0;
1060 }
1061
1062 #define PFMF_RESERVED   0xfffc0101UL
1063 #define PFMF_SK         0x00020000UL
1064 #define PFMF_CF         0x00010000UL
1065 #define PFMF_UI         0x00008000UL
1066 #define PFMF_FSC        0x00007000UL
1067 #define PFMF_NQ         0x00000800UL
1068 #define PFMF_MR         0x00000400UL
1069 #define PFMF_MC         0x00000200UL
1070 #define PFMF_KEY        0x000000feUL
1071
1072 static int handle_pfmf(struct kvm_vcpu *vcpu)
1073 {
1074         bool mr = false, mc = false, nq;
1075         int reg1, reg2;
1076         unsigned long start, end;
1077         unsigned char key;
1078
1079         vcpu->stat.instruction_pfmf++;
1080
1081         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
1082
1083         if (!test_kvm_facility(vcpu->kvm, 8))
1084                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1085
1086         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1087                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1088
1089         if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
1090                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1091
1092         /* Only provide non-quiescing support if enabled for the guest */
1093         if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ &&
1094             !test_kvm_facility(vcpu->kvm, 14))
1095                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1096
1097         /* Only provide conditional-SSKE support if enabled for the guest */
1098         if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK &&
1099             test_kvm_facility(vcpu->kvm, 10)) {
1100                 mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR;
1101                 mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC;
1102         }
1103
1104         nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ;
1105         key = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY;
1106         start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
1107         start = kvm_s390_logical_to_effective(vcpu, start);
1108
1109         if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
1110                 if (kvm_s390_check_low_addr_prot_real(vcpu, start))
1111                         return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
1112         }
1113
1114         switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
1115         case 0x00000000:
1116                 /* only 4k frames specify a real address */
1117                 start = kvm_s390_real_to_abs(vcpu, start);
1118                 end = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1);
1119                 break;
1120         case 0x00001000:
1121                 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
1122                 break;
1123         case 0x00002000:
1124                 /* only support 2G frame size if EDAT2 is available and we are
1125                    not in 24-bit addressing mode */
1126                 if (!test_kvm_facility(vcpu->kvm, 78) ||
1127                     psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_24BIT)
1128                         return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1129                 end = (start + _REGION3_SIZE) & ~(_REGION3_SIZE - 1);
1130                 break;
1131         default:
1132                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1133         }
1134
1135         while (start != end) {
1136                 unsigned long vmaddr;
1137                 bool unlocked = false;
1138
1139                 /* Translate guest address to host address */
1140                 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
1141                 if (kvm_is_error_hva(vmaddr))
1142                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1143
1144                 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
1145                         if (kvm_clear_guest(vcpu->kvm, start, PAGE_SIZE))
1146                                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1147                 }
1148
1149                 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
1150                         int rc = kvm_s390_skey_check_enable(vcpu);
1151
1152                         if (rc)
1153                                 return rc;
1154                         mmap_read_lock(current->mm);
1155                         rc = cond_set_guest_storage_key(current->mm, vmaddr,
1156                                                         key, NULL, nq, mr, mc);
1157                         if (rc < 0) {
1158                                 rc = fixup_user_fault(current->mm, vmaddr,
1159                                                       FAULT_FLAG_WRITE, &unlocked);
1160                                 rc = !rc ? -EAGAIN : rc;
1161                         }
1162                         mmap_read_unlock(current->mm);
1163                         if (rc == -EFAULT)
1164                                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1165                         if (rc == -EAGAIN)
1166                                 continue;
1167                         if (rc < 0)
1168                                 return rc;
1169                 }
1170                 start += PAGE_SIZE;
1171         }
1172         if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
1173                 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) {
1174                         vcpu->run->s.regs.gprs[reg2] = end;
1175                 } else {
1176                         vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL;
1177                         end = kvm_s390_logical_to_effective(vcpu, end);
1178                         vcpu->run->s.regs.gprs[reg2] |= end;
1179                 }
1180         }
1181         return 0;
1182 }
1183
1184 /*
1185  * Must be called with relevant read locks held (kvm->mm->mmap_lock, kvm->srcu)
1186  */
1187 static inline int __do_essa(struct kvm_vcpu *vcpu, const int orc)
1188 {
1189         int r1, r2, nappended, entries;
1190         unsigned long gfn, hva, res, pgstev, ptev;
1191         unsigned long *cbrlo;
1192
1193         /*
1194          * We don't need to set SD.FPF.SK to 1 here, because if we have a
1195          * machine check here we either handle it or crash
1196          */
1197
1198         kvm_s390_get_regs_rre(vcpu, &r1, &r2);
1199         gfn = vcpu->run->s.regs.gprs[r2] >> PAGE_SHIFT;
1200         hva = gfn_to_hva(vcpu->kvm, gfn);
1201         entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1202
1203         if (kvm_is_error_hva(hva))
1204                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1205
1206         nappended = pgste_perform_essa(vcpu->kvm->mm, hva, orc, &ptev, &pgstev);
1207         if (nappended < 0) {
1208                 res = orc ? 0x10 : 0;
1209                 vcpu->run->s.regs.gprs[r1] = res; /* Exception Indication */
1210                 return 0;
1211         }
1212         res = (pgstev & _PGSTE_GPS_USAGE_MASK) >> 22;
1213         /*
1214          * Set the block-content state part of the result. 0 means resident, so
1215          * nothing to do if the page is valid. 2 is for preserved pages
1216          * (non-present and non-zero), and 3 for zero pages (non-present and
1217          * zero).
1218          */
1219         if (ptev & _PAGE_INVALID) {
1220                 res |= 2;
1221                 if (pgstev & _PGSTE_GPS_ZERO)
1222                         res |= 1;
1223         }
1224         if (pgstev & _PGSTE_GPS_NODAT)
1225                 res |= 0x20;
1226         vcpu->run->s.regs.gprs[r1] = res;
1227         /*
1228          * It is possible that all the normal 511 slots were full, in which case
1229          * we will now write in the 512th slot, which is reserved for host use.
1230          * In both cases we let the normal essa handling code process all the
1231          * slots, including the reserved one, if needed.
1232          */
1233         if (nappended > 0) {
1234                 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo & PAGE_MASK);
1235                 cbrlo[entries] = gfn << PAGE_SHIFT;
1236         }
1237
1238         if (orc) {
1239                 struct kvm_memory_slot *ms = gfn_to_memslot(vcpu->kvm, gfn);
1240
1241                 /* Increment only if we are really flipping the bit */
1242                 if (ms && !test_and_set_bit(gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms)))
1243                         atomic64_inc(&vcpu->kvm->arch.cmma_dirty_pages);
1244         }
1245
1246         return nappended;
1247 }
1248
1249 static int handle_essa(struct kvm_vcpu *vcpu)
1250 {
1251         /* entries expected to be 1FF */
1252         int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1253         unsigned long *cbrlo;
1254         struct gmap *gmap;
1255         int i, orc;
1256
1257         VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries);
1258         gmap = vcpu->arch.gmap;
1259         vcpu->stat.instruction_essa++;
1260         if (!vcpu->kvm->arch.use_cmma)
1261                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1262
1263         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1264                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1265         /* Check for invalid operation request code */
1266         orc = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
1267         /* ORCs 0-6 are always valid */
1268         if (orc > (test_kvm_facility(vcpu->kvm, 147) ? ESSA_SET_STABLE_NODAT
1269                                                 : ESSA_SET_STABLE_IF_RESIDENT))
1270                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1271
1272         if (!vcpu->kvm->arch.migration_mode) {
1273                 /*
1274                  * CMMA is enabled in the KVM settings, but is disabled in
1275                  * the SIE block and in the mm_context, and we are not doing
1276                  * a migration. Enable CMMA in the mm_context.
1277                  * Since we need to take a write lock to write to the context
1278                  * to avoid races with storage keys handling, we check if the
1279                  * value really needs to be written to; if the value is
1280                  * already correct, we do nothing and avoid the lock.
1281                  */
1282                 if (vcpu->kvm->mm->context.uses_cmm == 0) {
1283                         mmap_write_lock(vcpu->kvm->mm);
1284                         vcpu->kvm->mm->context.uses_cmm = 1;
1285                         mmap_write_unlock(vcpu->kvm->mm);
1286                 }
1287                 /*
1288                  * If we are here, we are supposed to have CMMA enabled in
1289                  * the SIE block. Enabling CMMA works on a per-CPU basis,
1290                  * while the context use_cmma flag is per process.
1291                  * It's possible that the context flag is enabled and the
1292                  * SIE flag is not, so we set the flag always; if it was
1293                  * already set, nothing changes, otherwise we enable it
1294                  * on this CPU too.
1295                  */
1296                 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
1297                 /* Retry the ESSA instruction */
1298                 kvm_s390_retry_instr(vcpu);
1299         } else {
1300                 int srcu_idx;
1301
1302                 mmap_read_lock(vcpu->kvm->mm);
1303                 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
1304                 i = __do_essa(vcpu, orc);
1305                 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
1306                 mmap_read_unlock(vcpu->kvm->mm);
1307                 if (i < 0)
1308                         return i;
1309                 /* Account for the possible extra cbrl entry */
1310                 entries += i;
1311         }
1312         vcpu->arch.sie_block->cbrlo &= PAGE_MASK;       /* reset nceo */
1313         cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
1314         mmap_read_lock(gmap->mm);
1315         for (i = 0; i < entries; ++i)
1316                 __gmap_zap(gmap, cbrlo[i]);
1317         mmap_read_unlock(gmap->mm);
1318         return 0;
1319 }
1320
1321 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
1322 {
1323         switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1324         case 0x8a:
1325         case 0x8e:
1326         case 0x8f:
1327                 return handle_ipte_interlock(vcpu);
1328         case 0x8d:
1329                 return handle_epsw(vcpu);
1330         case 0xab:
1331                 return handle_essa(vcpu);
1332         case 0xaf:
1333                 return handle_pfmf(vcpu);
1334         default:
1335                 return -EOPNOTSUPP;
1336         }
1337 }
1338
1339 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
1340 {
1341         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1342         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1343         int reg, rc, nr_regs;
1344         u32 ctl_array[16];
1345         u64 ga;
1346         u8 ar;
1347
1348         vcpu->stat.instruction_lctl++;
1349
1350         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1351                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1352
1353         ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1354
1355         if (ga & 3)
1356                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1357
1358         VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1359         trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga);
1360
1361         nr_regs = ((reg3 - reg1) & 0xf) + 1;
1362         rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1363         if (rc)
1364                 return kvm_s390_inject_prog_cond(vcpu, rc);
1365         reg = reg1;
1366         nr_regs = 0;
1367         do {
1368                 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
1369                 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++];
1370                 if (reg == reg3)
1371                         break;
1372                 reg = (reg + 1) % 16;
1373         } while (1);
1374         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1375         return 0;
1376 }
1377
1378 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu)
1379 {
1380         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1381         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1382         int reg, rc, nr_regs;
1383         u32 ctl_array[16];
1384         u64 ga;
1385         u8 ar;
1386
1387         vcpu->stat.instruction_stctl++;
1388
1389         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1390                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1391
1392         ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1393
1394         if (ga & 3)
1395                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1396
1397         VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1398         trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga);
1399
1400         reg = reg1;
1401         nr_regs = 0;
1402         do {
1403                 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1404                 if (reg == reg3)
1405                         break;
1406                 reg = (reg + 1) % 16;
1407         } while (1);
1408         rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1409         return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1410 }
1411
1412 static int handle_lctlg(struct kvm_vcpu *vcpu)
1413 {
1414         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1415         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1416         int reg, rc, nr_regs;
1417         u64 ctl_array[16];
1418         u64 ga;
1419         u8 ar;
1420
1421         vcpu->stat.instruction_lctlg++;
1422
1423         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1424                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1425
1426         ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1427
1428         if (ga & 7)
1429                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1430
1431         VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1432         trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga);
1433
1434         nr_regs = ((reg3 - reg1) & 0xf) + 1;
1435         rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1436         if (rc)
1437                 return kvm_s390_inject_prog_cond(vcpu, rc);
1438         reg = reg1;
1439         nr_regs = 0;
1440         do {
1441                 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++];
1442                 if (reg == reg3)
1443                         break;
1444                 reg = (reg + 1) % 16;
1445         } while (1);
1446         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1447         return 0;
1448 }
1449
1450 static int handle_stctg(struct kvm_vcpu *vcpu)
1451 {
1452         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1453         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1454         int reg, rc, nr_regs;
1455         u64 ctl_array[16];
1456         u64 ga;
1457         u8 ar;
1458
1459         vcpu->stat.instruction_stctg++;
1460
1461         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1462                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1463
1464         ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1465
1466         if (ga & 7)
1467                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1468
1469         VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1470         trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga);
1471
1472         reg = reg1;
1473         nr_regs = 0;
1474         do {
1475                 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1476                 if (reg == reg3)
1477                         break;
1478                 reg = (reg + 1) % 16;
1479         } while (1);
1480         rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1481         return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1482 }
1483
1484 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
1485 {
1486         switch (vcpu->arch.sie_block->ipb & 0x000000ff) {
1487         case 0x25:
1488                 return handle_stctg(vcpu);
1489         case 0x2f:
1490                 return handle_lctlg(vcpu);
1491         case 0x60:
1492         case 0x61:
1493         case 0x62:
1494                 return handle_ri(vcpu);
1495         case 0x71:
1496                 return handle_lpswey(vcpu);
1497         default:
1498                 return -EOPNOTSUPP;
1499         }
1500 }
1501
1502 static int handle_tprot(struct kvm_vcpu *vcpu)
1503 {
1504         u64 address, operand2;
1505         unsigned long gpa;
1506         u8 access_key;
1507         bool writable;
1508         int ret, cc;
1509         u8 ar;
1510
1511         vcpu->stat.instruction_tprot++;
1512
1513         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1514                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1515
1516         kvm_s390_get_base_disp_sse(vcpu, &address, &operand2, &ar, NULL);
1517         access_key = (operand2 & 0xf0) >> 4;
1518
1519         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1520                 ipte_lock(vcpu->kvm);
1521
1522         ret = guest_translate_address_with_key(vcpu, address, ar, &gpa,
1523                                                GACC_STORE, access_key);
1524         if (ret == 0) {
1525                 gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable);
1526         } else if (ret == PGM_PROTECTION) {
1527                 writable = false;
1528                 /* Write protected? Try again with read-only... */
1529                 ret = guest_translate_address_with_key(vcpu, address, ar, &gpa,
1530                                                        GACC_FETCH, access_key);
1531         }
1532         if (ret >= 0) {
1533                 cc = -1;
1534
1535                 /* Fetching permitted; storing permitted */
1536                 if (ret == 0 && writable)
1537                         cc = 0;
1538                 /* Fetching permitted; storing not permitted */
1539                 else if (ret == 0 && !writable)
1540                         cc = 1;
1541                 /* Fetching not permitted; storing not permitted */
1542                 else if (ret == PGM_PROTECTION)
1543                         cc = 2;
1544                 /* Translation not available */
1545                 else if (ret != PGM_ADDRESSING && ret != PGM_TRANSLATION_SPEC)
1546                         cc = 3;
1547
1548                 if (cc != -1) {
1549                         kvm_s390_set_psw_cc(vcpu, cc);
1550                         ret = 0;
1551                 } else {
1552                         ret = kvm_s390_inject_program_int(vcpu, ret);
1553                 }
1554         }
1555
1556         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1557                 ipte_unlock(vcpu->kvm);
1558         return ret;
1559 }
1560
1561 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
1562 {
1563         switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1564         case 0x01:
1565                 return handle_tprot(vcpu);
1566         default:
1567                 return -EOPNOTSUPP;
1568         }
1569 }
1570
1571 static int handle_sckpf(struct kvm_vcpu *vcpu)
1572 {
1573         u32 value;
1574
1575         vcpu->stat.instruction_sckpf++;
1576
1577         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1578                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1579
1580         if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
1581                 return kvm_s390_inject_program_int(vcpu,
1582                                                    PGM_SPECIFICATION);
1583
1584         value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
1585         vcpu->arch.sie_block->todpr = value;
1586
1587         return 0;
1588 }
1589
1590 static int handle_ptff(struct kvm_vcpu *vcpu)
1591 {
1592         vcpu->stat.instruction_ptff++;
1593
1594         /* we don't emulate any control instructions yet */
1595         kvm_s390_set_psw_cc(vcpu, 3);
1596         return 0;
1597 }
1598
1599 int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
1600 {
1601         switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1602         case 0x04:
1603                 return handle_ptff(vcpu);
1604         case 0x07:
1605                 return handle_sckpf(vcpu);
1606         default:
1607                 return -EOPNOTSUPP;
1608         }
1609 }