arch/s390/kvm/priv.c

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