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 <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 #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_error_gpa(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_error_gpa(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 && vcpu->run->s.regs.gprs[1] & 0x00ff0000)
 680                         kvm_s390_set_psw_cc(vcpu, 3);
 681                 up_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem);
 682                 return ret;
 683         }
 684         up_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem);
 685         /*
 686          * A vfio_driver must register a hook.
 687          * No hook means no driver to enable the SIE CRYCB and no queues.
 688          * We send this response to the guest.
 689          */
 690         status.response_code = 0x01;
 691         memcpy(&vcpu->run->s.regs.gprs[1], &status, sizeof(status));
 692         kvm_s390_set_psw_cc(vcpu, 3);
 693         return 0;
 694 }
 695
 696 static int handle_stfl(struct kvm_vcpu *vcpu)
 697 {
 698         int rc;
 699         unsigned int fac;
 700
 701         vcpu->stat.instruction_stfl++;
 702
 703         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 704                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 705
 706         /*
 707          * We need to shift the lower 32 facility bits (bit 0-31) from a u64
 708          * into a u32 memory representation. They will remain bits 0-31.
 709          */
 710         fac = *vcpu->kvm->arch.model.fac_list >> 32;
 711         rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list),
 712                             &fac, sizeof(fac));
 713         if (rc)
 714                 return rc;
 715         VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac);
 716         trace_kvm_s390_handle_stfl(vcpu, fac);
 717         return 0;
 718 }
 719
 720 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
 721 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
 722 #define PSW_ADDR_24 0x0000000000ffffffUL
 723 #define PSW_ADDR_31 0x000000007fffffffUL
 724
 725 int is_valid_psw(psw_t *psw)
 726 {
 727         if (psw->mask & PSW_MASK_UNASSIGNED)
 728                 return 0;
 729         if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
 730                 if (psw->addr & ~PSW_ADDR_31)
 731                         return 0;
 732         }
 733         if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
 734                 return 0;
 735         if ((psw->mask & PSW_MASK_ADDR_MODE) ==  PSW_MASK_EA)
 736                 return 0;
 737         if (psw->addr & 1)
 738                 return 0;
 739         return 1;
 740 }
 741
 742 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
 743 {
 744         psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
 745         psw_compat_t new_psw;
 746         u64 addr;
 747         int rc;
 748         u8 ar;
 749
 750         vcpu->stat.instruction_lpsw++;
 751
 752         if (gpsw->mask & PSW_MASK_PSTATE)
 753                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 754
 755         addr = kvm_s390_get_base_disp_s(vcpu, &ar);
 756         if (addr & 7)
 757                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 758
 759         rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
 760         if (rc)
 761                 return kvm_s390_inject_prog_cond(vcpu, rc);
 762         if (!(new_psw.mask & PSW32_MASK_BASE))
 763                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 764         gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
 765         gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
 766         gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
 767         if (!is_valid_psw(gpsw))
 768                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 769         return 0;
 770 }
 771
 772 static int handle_lpswe(struct kvm_vcpu *vcpu)
 773 {
 774         psw_t new_psw;
 775         u64 addr;
 776         int rc;
 777         u8 ar;
 778
 779         vcpu->stat.instruction_lpswe++;
 780
 781         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 782                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 783
 784         addr = kvm_s390_get_base_disp_s(vcpu, &ar);
 785         if (addr & 7)
 786                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 787         rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
 788         if (rc)
 789                 return kvm_s390_inject_prog_cond(vcpu, rc);
 790         vcpu->arch.sie_block->gpsw = new_psw;
 791         if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
 792                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 793         return 0;
 794 }
 795
 796 static int handle_stidp(struct kvm_vcpu *vcpu)
 797 {
 798         u64 stidp_data = vcpu->kvm->arch.model.cpuid;
 799         u64 operand2;
 800         int rc;
 801         u8 ar;
 802
 803         vcpu->stat.instruction_stidp++;
 804
 805         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 806                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 807
 808         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 809
 810         if (operand2 & 7)
 811                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 812
 813         rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data));
 814         if (rc)
 815                 return kvm_s390_inject_prog_cond(vcpu, rc);
 816
 817         VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data);
 818         return 0;
 819 }
 820
 821 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
 822 {
 823         int cpus = 0;
 824         int n;
 825
 826         cpus = atomic_read(&vcpu->kvm->online_vcpus);
 827
 828         /* deal with other level 3 hypervisors */
 829         if (stsi(mem, 3, 2, 2))
 830                 mem->count = 0;
 831         if (mem->count < 8)
 832                 mem->count++;
 833         for (n = mem->count - 1; n > 0 ; n--)
 834                 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
 835
 836         memset(&mem->vm[0], 0, sizeof(mem->vm[0]));
 837         mem->vm[0].cpus_total = cpus;
 838         mem->vm[0].cpus_configured = cpus;
 839         mem->vm[0].cpus_standby = 0;
 840         mem->vm[0].cpus_reserved = 0;
 841         mem->vm[0].caf = 1000;
 842         memcpy(mem->vm[0].name, "KVMguest", 8);
 843         ASCEBC(mem->vm[0].name, 8);
 844         memcpy(mem->vm[0].cpi, "KVM/Linux       ", 16);
 845         ASCEBC(mem->vm[0].cpi, 16);
 846 }
 847
 848 static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, u8 ar,
 849                                  u8 fc, u8 sel1, u16 sel2)
 850 {
 851         vcpu->run->exit_reason = KVM_EXIT_S390_STSI;
 852         vcpu->run->s390_stsi.addr = addr;
 853         vcpu->run->s390_stsi.ar = ar;
 854         vcpu->run->s390_stsi.fc = fc;
 855         vcpu->run->s390_stsi.sel1 = sel1;
 856         vcpu->run->s390_stsi.sel2 = sel2;
 857 }
 858
 859 static int handle_stsi(struct kvm_vcpu *vcpu)
 860 {
 861         int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
 862         int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
 863         int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
 864         unsigned long mem = 0;
 865         u64 operand2;
 866         int rc = 0;
 867         u8 ar;
 868
 869         vcpu->stat.instruction_stsi++;
 870         VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2);
 871
 872         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 873                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 874
 875         /* Bailout forbidden function codes */
 876         if (fc > 3 && fc != 15)
 877                 goto out_no_data;
 878
 879         /*
 880          * fc 15 is provided only with
 881          *   - PTF/CPU topology support through facility 15
 882          *   - KVM_CAP_S390_USER_STSI
 883          */
 884         if (fc == 15 && (!test_kvm_facility(vcpu->kvm, 11) ||
 885                          !vcpu->kvm->arch.user_stsi))
 886                 goto out_no_data;
 887
 888         if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
 889             || vcpu->run->s.regs.gprs[1] & 0xffff0000)
 890                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 891
 892         if (fc == 0) {
 893                 vcpu->run->s.regs.gprs[0] = 3 << 28;
 894                 kvm_s390_set_psw_cc(vcpu, 0);
 895                 return 0;
 896         }
 897
 898         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 899
 900         if (!kvm_s390_pv_cpu_is_protected(vcpu) && (operand2 & 0xfff))
 901                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 902
 903         switch (fc) {
 904         case 1: /* same handling for 1 and 2 */
 905         case 2:
 906                 mem = get_zeroed_page(GFP_KERNEL_ACCOUNT);
 907                 if (!mem)
 908                         goto out_no_data;
 909                 if (stsi((void *) mem, fc, sel1, sel2))
 910                         goto out_no_data;
 911                 break;
 912         case 3:
 913                 if (sel1 != 2 || sel2 != 2)
 914                         goto out_no_data;
 915                 mem = get_zeroed_page(GFP_KERNEL_ACCOUNT);
 916                 if (!mem)
 917                         goto out_no_data;
 918                 handle_stsi_3_2_2(vcpu, (void *) mem);
 919                 break;
 920         case 15: /* fc 15 is fully handled in userspace */
 921                 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
 922                 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
 923                 return -EREMOTE;
 924         }
 925         if (kvm_s390_pv_cpu_is_protected(vcpu)) {
 926                 memcpy(sida_addr(vcpu->arch.sie_block), (void *)mem, PAGE_SIZE);
 927                 rc = 0;
 928         } else {
 929                 rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE);
 930         }
 931         if (rc) {
 932                 rc = kvm_s390_inject_prog_cond(vcpu, rc);
 933                 goto out;
 934         }
 935         if (vcpu->kvm->arch.user_stsi) {
 936                 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
 937                 rc = -EREMOTE;
 938         }
 939         trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
 940         free_page(mem);
 941         kvm_s390_set_psw_cc(vcpu, 0);
 942         vcpu->run->s.regs.gprs[0] = 0;
 943         return rc;
 944 out_no_data:
 945         kvm_s390_set_psw_cc(vcpu, 3);
 946 out:
 947         free_page(mem);
 948         return rc;
 949 }
 950
 951 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
 952 {
 953         switch (vcpu->arch.sie_block->ipa & 0x00ff) {
 954         case 0x02:
 955                 return handle_stidp(vcpu);
 956         case 0x04:
 957                 return handle_set_clock(vcpu);
 958         case 0x10:
 959                 return handle_set_prefix(vcpu);
 960         case 0x11:
 961                 return handle_store_prefix(vcpu);
 962         case 0x12:
 963                 return handle_store_cpu_address(vcpu);
 964         case 0x14:
 965                 return kvm_s390_handle_vsie(vcpu);
 966         case 0x21:
 967         case 0x50:
 968                 return handle_ipte_interlock(vcpu);
 969         case 0x29:
 970                 return handle_iske(vcpu);
 971         case 0x2a:
 972                 return handle_rrbe(vcpu);
 973         case 0x2b:
 974                 return handle_sske(vcpu);
 975         case 0x2c:
 976                 return handle_test_block(vcpu);
 977         case 0x30:
 978         case 0x31:
 979         case 0x32:
 980         case 0x33:
 981         case 0x34:
 982         case 0x35:
 983         case 0x36:
 984         case 0x37:
 985         case 0x38:
 986         case 0x39:
 987         case 0x3a:
 988         case 0x3b:
 989         case 0x3c:
 990         case 0x5f:
 991         case 0x74:
 992         case 0x76:
 993                 return handle_io_inst(vcpu);
 994         case 0x56:
 995                 return handle_sthyi(vcpu);
 996         case 0x7d:
 997                 return handle_stsi(vcpu);
 998         case 0xaf:
 999                 return handle_pqap(vcpu);
1000         case 0xb1:
1001                 return handle_stfl(vcpu);
1002         case 0xb2:
1003                 return handle_lpswe(vcpu);
1004         default:
1005                 return -EOPNOTSUPP;
1006         }
1007 }
1008
1009 static int handle_epsw(struct kvm_vcpu *vcpu)
1010 {
1011         int reg1, reg2;
1012
1013         vcpu->stat.instruction_epsw++;
1014
1015         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
1016
1017         /* This basically extracts the mask half of the psw. */
1018         vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
1019         vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
1020         if (reg2) {
1021                 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
1022                 vcpu->run->s.regs.gprs[reg2] |=
1023                         vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
1024         }
1025         return 0;
1026 }
1027
1028 #define PFMF_RESERVED   0xfffc0101UL
1029 #define PFMF_SK         0x00020000UL
1030 #define PFMF_CF         0x00010000UL
1031 #define PFMF_UI         0x00008000UL
1032 #define PFMF_FSC        0x00007000UL
1033 #define PFMF_NQ         0x00000800UL
1034 #define PFMF_MR         0x00000400UL
1035 #define PFMF_MC         0x00000200UL
1036 #define PFMF_KEY        0x000000feUL
1037
1038 static int handle_pfmf(struct kvm_vcpu *vcpu)
1039 {
1040         bool mr = false, mc = false, nq;
1041         int reg1, reg2;
1042         unsigned long start, end;
1043         unsigned char key;
1044
1045         vcpu->stat.instruction_pfmf++;
1046
1047         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
1048
1049         if (!test_kvm_facility(vcpu->kvm, 8))
1050                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1051
1052         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1053                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1054
1055         if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
1056                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1057
1058         /* Only provide non-quiescing support if enabled for the guest */
1059         if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ &&
1060             !test_kvm_facility(vcpu->kvm, 14))
1061                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1062
1063         /* Only provide conditional-SSKE support if enabled for the guest */
1064         if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK &&
1065             test_kvm_facility(vcpu->kvm, 10)) {
1066                 mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR;
1067                 mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC;
1068         }
1069
1070         nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ;
1071         key = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY;
1072         start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
1073         start = kvm_s390_logical_to_effective(vcpu, start);
1074
1075         if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
1076                 if (kvm_s390_check_low_addr_prot_real(vcpu, start))
1077                         return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
1078         }
1079
1080         switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
1081         case 0x00000000:
1082                 /* only 4k frames specify a real address */
1083                 start = kvm_s390_real_to_abs(vcpu, start);
1084                 end = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1);
1085                 break;
1086         case 0x00001000:
1087                 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
1088                 break;
1089         case 0x00002000:
1090                 /* only support 2G frame size if EDAT2 is available and we are
1091                    not in 24-bit addressing mode */
1092                 if (!test_kvm_facility(vcpu->kvm, 78) ||
1093                     psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_24BIT)
1094                         return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1095                 end = (start + _REGION3_SIZE) & ~(_REGION3_SIZE - 1);
1096                 break;
1097         default:
1098                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1099         }
1100
1101         while (start != end) {
1102                 unsigned long vmaddr;
1103                 bool unlocked = false;
1104
1105                 /* Translate guest address to host address */
1106                 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
1107                 if (kvm_is_error_hva(vmaddr))
1108                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1109
1110                 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
1111                         if (kvm_clear_guest(vcpu->kvm, start, PAGE_SIZE))
1112                                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1113                 }
1114
1115                 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
1116                         int rc = kvm_s390_skey_check_enable(vcpu);
1117
1118                         if (rc)
1119                                 return rc;
1120                         mmap_read_lock(current->mm);
1121                         rc = cond_set_guest_storage_key(current->mm, vmaddr,
1122                                                         key, NULL, nq, mr, mc);
1123                         if (rc < 0) {
1124                                 rc = fixup_user_fault(current->mm, vmaddr,
1125                                                       FAULT_FLAG_WRITE, &unlocked);
1126                                 rc = !rc ? -EAGAIN : rc;
1127                         }
1128                         mmap_read_unlock(current->mm);
1129                         if (rc == -EFAULT)
1130                                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1131                         if (rc == -EAGAIN)
1132                                 continue;
1133                         if (rc < 0)
1134                                 return rc;
1135                 }
1136                 start += PAGE_SIZE;
1137         }
1138         if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
1139                 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) {
1140                         vcpu->run->s.regs.gprs[reg2] = end;
1141                 } else {
1142                         vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL;
1143                         end = kvm_s390_logical_to_effective(vcpu, end);
1144                         vcpu->run->s.regs.gprs[reg2] |= end;
1145                 }
1146         }
1147         return 0;
1148 }
1149
1150 /*
1151  * Must be called with relevant read locks held (kvm->mm->mmap_lock, kvm->srcu)
1152  */
1153 static inline int __do_essa(struct kvm_vcpu *vcpu, const int orc)
1154 {
1155         int r1, r2, nappended, entries;
1156         unsigned long gfn, hva, res, pgstev, ptev;
1157         unsigned long *cbrlo;
1158
1159         /*
1160          * We don't need to set SD.FPF.SK to 1 here, because if we have a
1161          * machine check here we either handle it or crash
1162          */
1163
1164         kvm_s390_get_regs_rre(vcpu, &r1, &r2);
1165         gfn = vcpu->run->s.regs.gprs[r2] >> PAGE_SHIFT;
1166         hva = gfn_to_hva(vcpu->kvm, gfn);
1167         entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1168
1169         if (kvm_is_error_hva(hva))
1170                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1171
1172         nappended = pgste_perform_essa(vcpu->kvm->mm, hva, orc, &ptev, &pgstev);
1173         if (nappended < 0) {
1174                 res = orc ? 0x10 : 0;
1175                 vcpu->run->s.regs.gprs[r1] = res; /* Exception Indication */
1176                 return 0;
1177         }
1178         res = (pgstev & _PGSTE_GPS_USAGE_MASK) >> 22;
1179         /*
1180          * Set the block-content state part of the result. 0 means resident, so
1181          * nothing to do if the page is valid. 2 is for preserved pages
1182          * (non-present and non-zero), and 3 for zero pages (non-present and
1183          * zero).
1184          */
1185         if (ptev & _PAGE_INVALID) {
1186                 res |= 2;
1187                 if (pgstev & _PGSTE_GPS_ZERO)
1188                         res |= 1;
1189         }
1190         if (pgstev & _PGSTE_GPS_NODAT)
1191                 res |= 0x20;
1192         vcpu->run->s.regs.gprs[r1] = res;
1193         /*
1194          * It is possible that all the normal 511 slots were full, in which case
1195          * we will now write in the 512th slot, which is reserved for host use.
1196          * In both cases we let the normal essa handling code process all the
1197          * slots, including the reserved one, if needed.
1198          */
1199         if (nappended > 0) {
1200                 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo & PAGE_MASK);
1201                 cbrlo[entries] = gfn << PAGE_SHIFT;
1202         }
1203
1204         if (orc) {
1205                 struct kvm_memory_slot *ms = gfn_to_memslot(vcpu->kvm, gfn);
1206
1207                 /* Increment only if we are really flipping the bit */
1208                 if (ms && !test_and_set_bit(gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms)))
1209                         atomic64_inc(&vcpu->kvm->arch.cmma_dirty_pages);
1210         }
1211
1212         return nappended;
1213 }
1214
1215 static int handle_essa(struct kvm_vcpu *vcpu)
1216 {
1217         /* entries expected to be 1FF */
1218         int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1219         unsigned long *cbrlo;
1220         struct gmap *gmap;
1221         int i, orc;
1222
1223         VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries);
1224         gmap = vcpu->arch.gmap;
1225         vcpu->stat.instruction_essa++;
1226         if (!vcpu->kvm->arch.use_cmma)
1227                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1228
1229         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1230                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1231         /* Check for invalid operation request code */
1232         orc = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
1233         /* ORCs 0-6 are always valid */
1234         if (orc > (test_kvm_facility(vcpu->kvm, 147) ? ESSA_SET_STABLE_NODAT
1235                                                 : ESSA_SET_STABLE_IF_RESIDENT))
1236                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1237
1238         if (!vcpu->kvm->arch.migration_mode) {
1239                 /*
1240                  * CMMA is enabled in the KVM settings, but is disabled in
1241                  * the SIE block and in the mm_context, and we are not doing
1242                  * a migration. Enable CMMA in the mm_context.
1243                  * Since we need to take a write lock to write to the context
1244                  * to avoid races with storage keys handling, we check if the
1245                  * value really needs to be written to; if the value is
1246                  * already correct, we do nothing and avoid the lock.
1247                  */
1248                 if (vcpu->kvm->mm->context.uses_cmm == 0) {
1249                         mmap_write_lock(vcpu->kvm->mm);
1250                         vcpu->kvm->mm->context.uses_cmm = 1;
1251                         mmap_write_unlock(vcpu->kvm->mm);
1252                 }
1253                 /*
1254                  * If we are here, we are supposed to have CMMA enabled in
1255                  * the SIE block. Enabling CMMA works on a per-CPU basis,
1256                  * while the context use_cmma flag is per process.
1257                  * It's possible that the context flag is enabled and the
1258                  * SIE flag is not, so we set the flag always; if it was
1259                  * already set, nothing changes, otherwise we enable it
1260                  * on this CPU too.
1261                  */
1262                 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
1263                 /* Retry the ESSA instruction */
1264                 kvm_s390_retry_instr(vcpu);
1265         } else {
1266                 int srcu_idx;
1267
1268                 mmap_read_lock(vcpu->kvm->mm);
1269                 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
1270                 i = __do_essa(vcpu, orc);
1271                 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
1272                 mmap_read_unlock(vcpu->kvm->mm);
1273                 if (i < 0)
1274                         return i;
1275                 /* Account for the possible extra cbrl entry */
1276                 entries += i;
1277         }
1278         vcpu->arch.sie_block->cbrlo &= PAGE_MASK;       /* reset nceo */
1279         cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
1280         mmap_read_lock(gmap->mm);
1281         for (i = 0; i < entries; ++i)
1282                 __gmap_zap(gmap, cbrlo[i]);
1283         mmap_read_unlock(gmap->mm);
1284         return 0;
1285 }
1286
1287 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
1288 {
1289         switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1290         case 0x8a:
1291         case 0x8e:
1292         case 0x8f:
1293                 return handle_ipte_interlock(vcpu);
1294         case 0x8d:
1295                 return handle_epsw(vcpu);
1296         case 0xab:
1297                 return handle_essa(vcpu);
1298         case 0xaf:
1299                 return handle_pfmf(vcpu);
1300         default:
1301                 return -EOPNOTSUPP;
1302         }
1303 }
1304
1305 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
1306 {
1307         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1308         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1309         int reg, rc, nr_regs;
1310         u32 ctl_array[16];
1311         u64 ga;
1312         u8 ar;
1313
1314         vcpu->stat.instruction_lctl++;
1315
1316         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1317                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1318
1319         ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1320
1321         if (ga & 3)
1322                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1323
1324         VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1325         trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga);
1326
1327         nr_regs = ((reg3 - reg1) & 0xf) + 1;
1328         rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1329         if (rc)
1330                 return kvm_s390_inject_prog_cond(vcpu, rc);
1331         reg = reg1;
1332         nr_regs = 0;
1333         do {
1334                 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
1335                 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++];
1336                 if (reg == reg3)
1337                         break;
1338                 reg = (reg + 1) % 16;
1339         } while (1);
1340         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1341         return 0;
1342 }
1343
1344 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu)
1345 {
1346         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1347         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1348         int reg, rc, nr_regs;
1349         u32 ctl_array[16];
1350         u64 ga;
1351         u8 ar;
1352
1353         vcpu->stat.instruction_stctl++;
1354
1355         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1356                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1357
1358         ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1359
1360         if (ga & 3)
1361                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1362
1363         VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1364         trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga);
1365
1366         reg = reg1;
1367         nr_regs = 0;
1368         do {
1369                 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1370                 if (reg == reg3)
1371                         break;
1372                 reg = (reg + 1) % 16;
1373         } while (1);
1374         rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1375         return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1376 }
1377
1378 static int handle_lctlg(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         u64 ctl_array[16];
1384         u64 ga;
1385         u8 ar;
1386
1387         vcpu->stat.instruction_lctlg++;
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_rsy(vcpu, &ar);
1393
1394         if (ga & 7)
1395                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1396
1397         VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1398         trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga);
1399
1400         nr_regs = ((reg3 - reg1) & 0xf) + 1;
1401         rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1402         if (rc)
1403                 return kvm_s390_inject_prog_cond(vcpu, rc);
1404         reg = reg1;
1405         nr_regs = 0;
1406         do {
1407                 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++];
1408                 if (reg == reg3)
1409                         break;
1410                 reg = (reg + 1) % 16;
1411         } while (1);
1412         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1413         return 0;
1414 }
1415
1416 static int handle_stctg(struct kvm_vcpu *vcpu)
1417 {
1418         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1419         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1420         int reg, rc, nr_regs;
1421         u64 ctl_array[16];
1422         u64 ga;
1423         u8 ar;
1424
1425         vcpu->stat.instruction_stctg++;
1426
1427         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1428                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1429
1430         ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1431
1432         if (ga & 7)
1433                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1434
1435         VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1436         trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga);
1437
1438         reg = reg1;
1439         nr_regs = 0;
1440         do {
1441                 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1442                 if (reg == reg3)
1443                         break;
1444                 reg = (reg + 1) % 16;
1445         } while (1);
1446         rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1447         return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1448 }
1449
1450 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
1451 {
1452         switch (vcpu->arch.sie_block->ipb & 0x000000ff) {
1453         case 0x25:
1454                 return handle_stctg(vcpu);
1455         case 0x2f:
1456                 return handle_lctlg(vcpu);
1457         case 0x60:
1458         case 0x61:
1459         case 0x62:
1460                 return handle_ri(vcpu);
1461         default:
1462                 return -EOPNOTSUPP;
1463         }
1464 }
1465
1466 static int handle_tprot(struct kvm_vcpu *vcpu)
1467 {
1468         u64 address, operand2;
1469         unsigned long gpa;
1470         u8 access_key;
1471         bool writable;
1472         int ret, cc;
1473         u8 ar;
1474
1475         vcpu->stat.instruction_tprot++;
1476
1477         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1478                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1479
1480         kvm_s390_get_base_disp_sse(vcpu, &address, &operand2, &ar, NULL);
1481         access_key = (operand2 & 0xf0) >> 4;
1482
1483         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1484                 ipte_lock(vcpu->kvm);
1485
1486         ret = guest_translate_address_with_key(vcpu, address, ar, &gpa,
1487                                                GACC_STORE, access_key);
1488         if (ret == 0) {
1489                 gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable);
1490         } else if (ret == PGM_PROTECTION) {
1491                 writable = false;
1492                 /* Write protected? Try again with read-only... */
1493                 ret = guest_translate_address_with_key(vcpu, address, ar, &gpa,
1494                                                        GACC_FETCH, access_key);
1495         }
1496         if (ret >= 0) {
1497                 cc = -1;
1498
1499                 /* Fetching permitted; storing permitted */
1500                 if (ret == 0 && writable)
1501                         cc = 0;
1502                 /* Fetching permitted; storing not permitted */
1503                 else if (ret == 0 && !writable)
1504                         cc = 1;
1505                 /* Fetching not permitted; storing not permitted */
1506                 else if (ret == PGM_PROTECTION)
1507                         cc = 2;
1508                 /* Translation not available */
1509                 else if (ret != PGM_ADDRESSING && ret != PGM_TRANSLATION_SPEC)
1510                         cc = 3;
1511
1512                 if (cc != -1) {
1513                         kvm_s390_set_psw_cc(vcpu, cc);
1514                         ret = 0;
1515                 } else {
1516                         ret = kvm_s390_inject_program_int(vcpu, ret);
1517                 }
1518         }
1519
1520         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1521                 ipte_unlock(vcpu->kvm);
1522         return ret;
1523 }
1524
1525 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
1526 {
1527         switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1528         case 0x01:
1529                 return handle_tprot(vcpu);
1530         default:
1531                 return -EOPNOTSUPP;
1532         }
1533 }
1534
1535 static int handle_sckpf(struct kvm_vcpu *vcpu)
1536 {
1537         u32 value;
1538
1539         vcpu->stat.instruction_sckpf++;
1540
1541         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1542                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1543
1544         if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
1545                 return kvm_s390_inject_program_int(vcpu,
1546                                                    PGM_SPECIFICATION);
1547
1548         value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
1549         vcpu->arch.sie_block->todpr = value;
1550
1551         return 0;
1552 }
1553
1554 static int handle_ptff(struct kvm_vcpu *vcpu)
1555 {
1556         vcpu->stat.instruction_ptff++;
1557
1558         /* we don't emulate any control instructions yet */
1559         kvm_s390_set_psw_cc(vcpu, 3);
1560         return 0;
1561 }
1562
1563 int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
1564 {
1565         switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1566         case 0x04:
1567                 return handle_ptff(vcpu);
1568         case 0x07:
1569                 return handle_sckpf(vcpu);
1570         default:
1571                 return -EOPNOTSUPP;
1572         }
1573 }