arch/s390/kvm/priv.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * handling privileged instructions
   4  *
   5  * Copyright IBM Corp. 2008, 2018
   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/compat.h>
  15 #include <linux/mm_types.h>
  16
  17 #include <asm/asm-offsets.h>
  18 #include <asm/facility.h>
  19 #include <asm/current.h>
  20 #include <asm/debug.h>
  21 #include <asm/ebcdic.h>
  22 #include <asm/sysinfo.h>
  23 #include <asm/pgtable.h>
  24 #include <asm/page-states.h>
  25 #include <asm/pgalloc.h>
  26 #include <asm/gmap.h>
  27 #include <asm/io.h>
  28 #include <asm/ptrace.h>
  29 #include <asm/sclp.h>
  30 #include "gaccess.h"
  31 #include "kvm-s390.h"
  32 #include "trace.h"
  33
  34 static int handle_ri(struct kvm_vcpu *vcpu)
  35 {
  36         vcpu->stat.instruction_ri++;
  37
  38         if (test_kvm_facility(vcpu->kvm, 64)) {
  39                 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (lazy)");
  40                 vcpu->arch.sie_block->ecb3 |= ECB3_RI;
  41                 kvm_s390_retry_instr(vcpu);
  42                 return 0;
  43         } else
  44                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
  45 }
  46
  47 int kvm_s390_handle_aa(struct kvm_vcpu *vcpu)
  48 {
  49         if ((vcpu->arch.sie_block->ipa & 0xf) <= 4)
  50                 return handle_ri(vcpu);
  51         else
  52                 return -EOPNOTSUPP;
  53 }
  54
  55 static int handle_gs(struct kvm_vcpu *vcpu)
  56 {
  57         vcpu->stat.instruction_gs++;
  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         struct kvm_s390_vm_tod_clock gtod = { 0 };
  88         int rc;
  89         u8 ar;
  90         u64 op2;
  91
  92         vcpu->stat.instruction_sck++;
  93
  94         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
  95                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
  96
  97         op2 = kvm_s390_get_base_disp_s(vcpu, &ar);
  98         if (op2 & 7)    /* Operand must be on a doubleword boundary */
  99                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 100         rc = read_guest(vcpu, op2, ar, &gtod.tod, sizeof(gtod.tod));
 101         if (rc)
 102                 return kvm_s390_inject_prog_cond(vcpu, rc);
 103
 104         VCPU_EVENT(vcpu, 3, "SCK: setting guest TOD to 0x%llx", gtod.tod);
 105         kvm_s390_set_tod_clock(vcpu->kvm, &gtod);
 106
 107         kvm_s390_set_psw_cc(vcpu, 0);
 108         return 0;
 109 }
 110
 111 static int handle_set_prefix(struct kvm_vcpu *vcpu)
 112 {
 113         u64 operand2;
 114         u32 address;
 115         int rc;
 116         u8 ar;
 117
 118         vcpu->stat.instruction_spx++;
 119
 120         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 121                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 122
 123         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 124
 125         /* must be word boundary */
 126         if (operand2 & 3)
 127                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 128
 129         /* get the value */
 130         rc = read_guest(vcpu, operand2, ar, &address, sizeof(address));
 131         if (rc)
 132                 return kvm_s390_inject_prog_cond(vcpu, rc);
 133
 134         address &= 0x7fffe000u;
 135
 136         /*
 137          * Make sure the new value is valid memory. We only need to check the
 138          * first page, since address is 8k aligned and memory pieces are always
 139          * at least 1MB aligned and have at least a size of 1MB.
 140          */
 141         if (kvm_is_error_gpa(vcpu->kvm, address))
 142                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 143
 144         kvm_s390_set_prefix(vcpu, address);
 145         trace_kvm_s390_handle_prefix(vcpu, 1, address);
 146         return 0;
 147 }
 148
 149 static int handle_store_prefix(struct kvm_vcpu *vcpu)
 150 {
 151         u64 operand2;
 152         u32 address;
 153         int rc;
 154         u8 ar;
 155
 156         vcpu->stat.instruction_stpx++;
 157
 158         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 159                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 160
 161         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 162
 163         /* must be word boundary */
 164         if (operand2 & 3)
 165                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 166
 167         address = kvm_s390_get_prefix(vcpu);
 168
 169         /* get the value */
 170         rc = write_guest(vcpu, operand2, ar, &address, sizeof(address));
 171         if (rc)
 172                 return kvm_s390_inject_prog_cond(vcpu, rc);
 173
 174         VCPU_EVENT(vcpu, 3, "STPX: storing prefix 0x%x into 0x%llx", address, operand2);
 175         trace_kvm_s390_handle_prefix(vcpu, 0, address);
 176         return 0;
 177 }
 178
 179 static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
 180 {
 181         u16 vcpu_id = vcpu->vcpu_id;
 182         u64 ga;
 183         int rc;
 184         u8 ar;
 185
 186         vcpu->stat.instruction_stap++;
 187
 188         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 189                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 190
 191         ga = kvm_s390_get_base_disp_s(vcpu, &ar);
 192
 193         if (ga & 1)
 194                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 195
 196         rc = write_guest(vcpu, ga, ar, &vcpu_id, sizeof(vcpu_id));
 197         if (rc)
 198                 return kvm_s390_inject_prog_cond(vcpu, rc);
 199
 200         VCPU_EVENT(vcpu, 3, "STAP: storing cpu address (%u) to 0x%llx", vcpu_id, ga);
 201         trace_kvm_s390_handle_stap(vcpu, ga);
 202         return 0;
 203 }
 204
 205 int kvm_s390_skey_check_enable(struct kvm_vcpu *vcpu)
 206 {
 207         int rc;
 208
 209         trace_kvm_s390_skey_related_inst(vcpu);
 210         /* Already enabled? */
 211         if (vcpu->arch.skey_enabled)
 212                 return 0;
 213
 214         rc = s390_enable_skey();
 215         VCPU_EVENT(vcpu, 3, "enabling storage keys for guest: %d", rc);
 216         if (rc)
 217                 return rc;
 218
 219         if (kvm_s390_test_cpuflags(vcpu, CPUSTAT_KSS))
 220                 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_KSS);
 221         if (!vcpu->kvm->arch.use_skf)
 222                 vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
 223         else
 224                 vcpu->arch.sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | ICTL_RRBE);
 225         vcpu->arch.skey_enabled = true;
 226         return 0;
 227 }
 228
 229 static int try_handle_skey(struct kvm_vcpu *vcpu)
 230 {
 231         int rc;
 232
 233         rc = kvm_s390_skey_check_enable(vcpu);
 234         if (rc)
 235                 return rc;
 236         if (vcpu->kvm->arch.use_skf) {
 237                 /* with storage-key facility, SIE interprets it for us */
 238                 kvm_s390_retry_instr(vcpu);
 239                 VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
 240                 return -EAGAIN;
 241         }
 242         return 0;
 243 }
 244
 245 static int handle_iske(struct kvm_vcpu *vcpu)
 246 {
 247         unsigned long gaddr, vmaddr;
 248         unsigned char key;
 249         int reg1, reg2;
 250         bool unlocked;
 251         int rc;
 252
 253         vcpu->stat.instruction_iske++;
 254
 255         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 256                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 257
 258         rc = try_handle_skey(vcpu);
 259         if (rc)
 260                 return rc != -EAGAIN ? rc : 0;
 261
 262         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 263
 264         gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 265         gaddr = kvm_s390_logical_to_effective(vcpu, gaddr);
 266         gaddr = kvm_s390_real_to_abs(vcpu, gaddr);
 267         vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr));
 268         if (kvm_is_error_hva(vmaddr))
 269                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 270 retry:
 271         unlocked = false;
 272         down_read(&current->mm->mmap_sem);
 273         rc = get_guest_storage_key(current->mm, vmaddr, &key);
 274
 275         if (rc) {
 276                 rc = fixup_user_fault(current, current->mm, vmaddr,
 277                                       FAULT_FLAG_WRITE, &unlocked);
 278                 if (!rc) {
 279                         up_read(&current->mm->mmap_sem);
 280                         goto retry;
 281                 }
 282         }
 283         if (rc)
 284                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 285         up_read(&current->mm->mmap_sem);
 286         vcpu->run->s.regs.gprs[reg1] &= ~0xff;
 287         vcpu->run->s.regs.gprs[reg1] |= key;
 288         return 0;
 289 }
 290
 291 static int handle_rrbe(struct kvm_vcpu *vcpu)
 292 {
 293         unsigned long vmaddr, gaddr;
 294         int reg1, reg2;
 295         bool unlocked;
 296         int rc;
 297
 298         vcpu->stat.instruction_rrbe++;
 299
 300         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 301                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 302
 303         rc = try_handle_skey(vcpu);
 304         if (rc)
 305                 return rc != -EAGAIN ? rc : 0;
 306
 307         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 308
 309         gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 310         gaddr = kvm_s390_logical_to_effective(vcpu, gaddr);
 311         gaddr = kvm_s390_real_to_abs(vcpu, gaddr);
 312         vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr));
 313         if (kvm_is_error_hva(vmaddr))
 314                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 315 retry:
 316         unlocked = false;
 317         down_read(&current->mm->mmap_sem);
 318         rc = reset_guest_reference_bit(current->mm, vmaddr);
 319         if (rc < 0) {
 320                 rc = fixup_user_fault(current, current->mm, vmaddr,
 321                                       FAULT_FLAG_WRITE, &unlocked);
 322                 if (!rc) {
 323                         up_read(&current->mm->mmap_sem);
 324                         goto retry;
 325                 }
 326         }
 327         if (rc < 0)
 328                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 329         up_read(&current->mm->mmap_sem);
 330         kvm_s390_set_psw_cc(vcpu, rc);
 331         return 0;
 332 }
 333
 334 #define SSKE_NQ 0x8
 335 #define SSKE_MR 0x4
 336 #define SSKE_MC 0x2
 337 #define SSKE_MB 0x1
 338 static int handle_sske(struct kvm_vcpu *vcpu)
 339 {
 340         unsigned char m3 = vcpu->arch.sie_block->ipb >> 28;
 341         unsigned long start, end;
 342         unsigned char key, oldkey;
 343         int reg1, reg2;
 344         bool unlocked;
 345         int rc;
 346
 347         vcpu->stat.instruction_sske++;
 348
 349         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 350                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 351
 352         rc = try_handle_skey(vcpu);
 353         if (rc)
 354                 return rc != -EAGAIN ? rc : 0;
 355
 356         if (!test_kvm_facility(vcpu->kvm, 8))
 357                 m3 &= ~SSKE_MB;
 358         if (!test_kvm_facility(vcpu->kvm, 10))
 359                 m3 &= ~(SSKE_MC | SSKE_MR);
 360         if (!test_kvm_facility(vcpu->kvm, 14))
 361                 m3 &= ~SSKE_NQ;
 362
 363         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 364
 365         key = vcpu->run->s.regs.gprs[reg1] & 0xfe;
 366         start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 367         start = kvm_s390_logical_to_effective(vcpu, start);
 368         if (m3 & SSKE_MB) {
 369                 /* start already designates an absolute address */
 370                 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
 371         } else {
 372                 start = kvm_s390_real_to_abs(vcpu, start);
 373                 end = start + PAGE_SIZE;
 374         }
 375
 376         while (start != end) {
 377                 unsigned long vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
 378                 unlocked = false;
 379
 380                 if (kvm_is_error_hva(vmaddr))
 381                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 382
 383                 down_read(&current->mm->mmap_sem);
 384                 rc = cond_set_guest_storage_key(current->mm, vmaddr, key, &oldkey,
 385                                                 m3 & SSKE_NQ, m3 & SSKE_MR,
 386                                                 m3 & SSKE_MC);
 387
 388                 if (rc < 0) {
 389                         rc = fixup_user_fault(current, current->mm, vmaddr,
 390                                               FAULT_FLAG_WRITE, &unlocked);
 391                         rc = !rc ? -EAGAIN : rc;
 392                 }
 393                 if (rc == -EFAULT)
 394                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 395
 396                 up_read(&current->mm->mmap_sem);
 397                 if (rc >= 0)
 398                         start += PAGE_SIZE;
 399         }
 400
 401         if (m3 & (SSKE_MC | SSKE_MR)) {
 402                 if (m3 & SSKE_MB) {
 403                         /* skey in reg1 is unpredictable */
 404                         kvm_s390_set_psw_cc(vcpu, 3);
 405                 } else {
 406                         kvm_s390_set_psw_cc(vcpu, rc);
 407                         vcpu->run->s.regs.gprs[reg1] &= ~0xff00UL;
 408                         vcpu->run->s.regs.gprs[reg1] |= (u64) oldkey << 8;
 409                 }
 410         }
 411         if (m3 & SSKE_MB) {
 412                 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT)
 413                         vcpu->run->s.regs.gprs[reg2] &= ~PAGE_MASK;
 414                 else
 415                         vcpu->run->s.regs.gprs[reg2] &= ~0xfffff000UL;
 416                 end = kvm_s390_logical_to_effective(vcpu, end);
 417                 vcpu->run->s.regs.gprs[reg2] |= end;
 418         }
 419         return 0;
 420 }
 421
 422 static int handle_ipte_interlock(struct kvm_vcpu *vcpu)
 423 {
 424         vcpu->stat.instruction_ipte_interlock++;
 425         if (psw_bits(vcpu->arch.sie_block->gpsw).pstate)
 426                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 427         wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu));
 428         kvm_s390_retry_instr(vcpu);
 429         VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation");
 430         return 0;
 431 }
 432
 433 static int handle_test_block(struct kvm_vcpu *vcpu)
 434 {
 435         gpa_t addr;
 436         int reg2;
 437
 438         vcpu->stat.instruction_tb++;
 439
 440         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 441                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 442
 443         kvm_s390_get_regs_rre(vcpu, NULL, &reg2);
 444         addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 445         addr = kvm_s390_logical_to_effective(vcpu, addr);
 446         if (kvm_s390_check_low_addr_prot_real(vcpu, addr))
 447                 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
 448         addr = kvm_s390_real_to_abs(vcpu, addr);
 449
 450         if (kvm_is_error_gpa(vcpu->kvm, addr))
 451                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 452         /*
 453          * We don't expect errors on modern systems, and do not care
 454          * about storage keys (yet), so let's just clear the page.
 455          */
 456         if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE))
 457                 return -EFAULT;
 458         kvm_s390_set_psw_cc(vcpu, 0);
 459         vcpu->run->s.regs.gprs[0] = 0;
 460         return 0;
 461 }
 462
 463 static int handle_tpi(struct kvm_vcpu *vcpu)
 464 {
 465         struct kvm_s390_interrupt_info *inti;
 466         unsigned long len;
 467         u32 tpi_data[3];
 468         int rc;
 469         u64 addr;
 470         u8 ar;
 471
 472         vcpu->stat.instruction_tpi++;
 473
 474         addr = kvm_s390_get_base_disp_s(vcpu, &ar);
 475         if (addr & 3)
 476                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 477
 478         inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0);
 479         if (!inti) {
 480                 kvm_s390_set_psw_cc(vcpu, 0);
 481                 return 0;
 482         }
 483
 484         tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr;
 485         tpi_data[1] = inti->io.io_int_parm;
 486         tpi_data[2] = inti->io.io_int_word;
 487         if (addr) {
 488                 /*
 489                  * Store the two-word I/O interruption code into the
 490                  * provided area.
 491                  */
 492                 len = sizeof(tpi_data) - 4;
 493                 rc = write_guest(vcpu, addr, ar, &tpi_data, len);
 494                 if (rc) {
 495                         rc = kvm_s390_inject_prog_cond(vcpu, rc);
 496                         goto reinject_interrupt;
 497                 }
 498         } else {
 499                 /*
 500                  * Store the three-word I/O interruption code into
 501                  * the appropriate lowcore area.
 502                  */
 503                 len = sizeof(tpi_data);
 504                 if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) {
 505                         /* failed writes to the low core are not recoverable */
 506                         rc = -EFAULT;
 507                         goto reinject_interrupt;
 508                 }
 509         }
 510
 511         /* irq was successfully handed to the guest */
 512         kfree(inti);
 513         kvm_s390_set_psw_cc(vcpu, 1);
 514         return 0;
 515 reinject_interrupt:
 516         /*
 517          * If we encounter a problem storing the interruption code, the
 518          * instruction is suppressed from the guest's view: reinject the
 519          * interrupt.
 520          */
 521         if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) {
 522                 kfree(inti);
 523                 rc = -EFAULT;
 524         }
 525         /* don't set the cc, a pgm irq was injected or we drop to user space */
 526         return rc ? -EFAULT : 0;
 527 }
 528
 529 static int handle_tsch(struct kvm_vcpu *vcpu)
 530 {
 531         struct kvm_s390_interrupt_info *inti = NULL;
 532         const u64 isc_mask = 0xffUL << 24; /* all iscs set */
 533
 534         vcpu->stat.instruction_tsch++;
 535
 536         /* a valid schid has at least one bit set */
 537         if (vcpu->run->s.regs.gprs[1])
 538                 inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask,
 539                                            vcpu->run->s.regs.gprs[1]);
 540
 541         /*
 542          * Prepare exit to userspace.
 543          * We indicate whether we dequeued a pending I/O interrupt
 544          * so that userspace can re-inject it if the instruction gets
 545          * a program check. While this may re-order the pending I/O
 546          * interrupts, this is no problem since the priority is kept
 547          * intact.
 548          */
 549         vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
 550         vcpu->run->s390_tsch.dequeued = !!inti;
 551         if (inti) {
 552                 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
 553                 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
 554                 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
 555                 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
 556         }
 557         vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
 558         kfree(inti);
 559         return -EREMOTE;
 560 }
 561
 562 static int handle_io_inst(struct kvm_vcpu *vcpu)
 563 {
 564         VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
 565
 566         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 567                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 568
 569         if (vcpu->kvm->arch.css_support) {
 570                 /*
 571                  * Most I/O instructions will be handled by userspace.
 572                  * Exceptions are tpi and the interrupt portion of tsch.
 573                  */
 574                 if (vcpu->arch.sie_block->ipa == 0xb236)
 575                         return handle_tpi(vcpu);
 576                 if (vcpu->arch.sie_block->ipa == 0xb235)
 577                         return handle_tsch(vcpu);
 578                 /* Handle in userspace. */
 579                 vcpu->stat.instruction_io_other++;
 580                 return -EOPNOTSUPP;
 581         } else {
 582                 /*
 583                  * Set condition code 3 to stop the guest from issuing channel
 584                  * I/O instructions.
 585                  */
 586                 kvm_s390_set_psw_cc(vcpu, 3);
 587                 return 0;
 588         }
 589 }
 590
 591 static int handle_stfl(struct kvm_vcpu *vcpu)
 592 {
 593         int rc;
 594         unsigned int fac;
 595
 596         vcpu->stat.instruction_stfl++;
 597
 598         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 599                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 600
 601         /*
 602          * We need to shift the lower 32 facility bits (bit 0-31) from a u64
 603          * into a u32 memory representation. They will remain bits 0-31.
 604          */
 605         fac = *vcpu->kvm->arch.model.fac_list >> 32;
 606         rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list),
 607                             &fac, sizeof(fac));
 608         if (rc)
 609                 return rc;
 610         VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac);
 611         trace_kvm_s390_handle_stfl(vcpu, fac);
 612         return 0;
 613 }
 614
 615 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
 616 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
 617 #define PSW_ADDR_24 0x0000000000ffffffUL
 618 #define PSW_ADDR_31 0x000000007fffffffUL
 619
 620 int is_valid_psw(psw_t *psw)
 621 {
 622         if (psw->mask & PSW_MASK_UNASSIGNED)
 623                 return 0;
 624         if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
 625                 if (psw->addr & ~PSW_ADDR_31)
 626                         return 0;
 627         }
 628         if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
 629                 return 0;
 630         if ((psw->mask & PSW_MASK_ADDR_MODE) ==  PSW_MASK_EA)
 631                 return 0;
 632         if (psw->addr & 1)
 633                 return 0;
 634         return 1;
 635 }
 636
 637 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
 638 {
 639         psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
 640         psw_compat_t new_psw;
 641         u64 addr;
 642         int rc;
 643         u8 ar;
 644
 645         vcpu->stat.instruction_lpsw++;
 646
 647         if (gpsw->mask & PSW_MASK_PSTATE)
 648                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 649
 650         addr = kvm_s390_get_base_disp_s(vcpu, &ar);
 651         if (addr & 7)
 652                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 653
 654         rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
 655         if (rc)
 656                 return kvm_s390_inject_prog_cond(vcpu, rc);
 657         if (!(new_psw.mask & PSW32_MASK_BASE))
 658                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 659         gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
 660         gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
 661         gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
 662         if (!is_valid_psw(gpsw))
 663                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 664         return 0;
 665 }
 666
 667 static int handle_lpswe(struct kvm_vcpu *vcpu)
 668 {
 669         psw_t new_psw;
 670         u64 addr;
 671         int rc;
 672         u8 ar;
 673
 674         vcpu->stat.instruction_lpswe++;
 675
 676         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 677                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 678
 679         addr = kvm_s390_get_base_disp_s(vcpu, &ar);
 680         if (addr & 7)
 681                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 682         rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
 683         if (rc)
 684                 return kvm_s390_inject_prog_cond(vcpu, rc);
 685         vcpu->arch.sie_block->gpsw = new_psw;
 686         if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
 687                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 688         return 0;
 689 }
 690
 691 static int handle_stidp(struct kvm_vcpu *vcpu)
 692 {
 693         u64 stidp_data = vcpu->kvm->arch.model.cpuid;
 694         u64 operand2;
 695         int rc;
 696         u8 ar;
 697
 698         vcpu->stat.instruction_stidp++;
 699
 700         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 701                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 702
 703         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 704
 705         if (operand2 & 7)
 706                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 707
 708         rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data));
 709         if (rc)
 710                 return kvm_s390_inject_prog_cond(vcpu, rc);
 711
 712         VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data);
 713         return 0;
 714 }
 715
 716 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
 717 {
 718         int cpus = 0;
 719         int n;
 720
 721         cpus = atomic_read(&vcpu->kvm->online_vcpus);
 722
 723         /* deal with other level 3 hypervisors */
 724         if (stsi(mem, 3, 2, 2))
 725                 mem->count = 0;
 726         if (mem->count < 8)
 727                 mem->count++;
 728         for (n = mem->count - 1; n > 0 ; n--)
 729                 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
 730
 731         memset(&mem->vm[0], 0, sizeof(mem->vm[0]));
 732         mem->vm[0].cpus_total = cpus;
 733         mem->vm[0].cpus_configured = cpus;
 734         mem->vm[0].cpus_standby = 0;
 735         mem->vm[0].cpus_reserved = 0;
 736         mem->vm[0].caf = 1000;
 737         memcpy(mem->vm[0].name, "KVMguest", 8);
 738         ASCEBC(mem->vm[0].name, 8);
 739         memcpy(mem->vm[0].cpi, "KVM/Linux       ", 16);
 740         ASCEBC(mem->vm[0].cpi, 16);
 741 }
 742
 743 static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, u8 ar,
 744                                  u8 fc, u8 sel1, u16 sel2)
 745 {
 746         vcpu->run->exit_reason = KVM_EXIT_S390_STSI;
 747         vcpu->run->s390_stsi.addr = addr;
 748         vcpu->run->s390_stsi.ar = ar;
 749         vcpu->run->s390_stsi.fc = fc;
 750         vcpu->run->s390_stsi.sel1 = sel1;
 751         vcpu->run->s390_stsi.sel2 = sel2;
 752 }
 753
 754 static int handle_stsi(struct kvm_vcpu *vcpu)
 755 {
 756         int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
 757         int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
 758         int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
 759         unsigned long mem = 0;
 760         u64 operand2;
 761         int rc = 0;
 762         u8 ar;
 763
 764         vcpu->stat.instruction_stsi++;
 765         VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2);
 766
 767         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 768                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 769
 770         if (fc > 3) {
 771                 kvm_s390_set_psw_cc(vcpu, 3);
 772                 return 0;
 773         }
 774
 775         if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
 776             || vcpu->run->s.regs.gprs[1] & 0xffff0000)
 777                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 778
 779         if (fc == 0) {
 780                 vcpu->run->s.regs.gprs[0] = 3 << 28;
 781                 kvm_s390_set_psw_cc(vcpu, 0);
 782                 return 0;
 783         }
 784
 785         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 786
 787         if (operand2 & 0xfff)
 788                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 789
 790         switch (fc) {
 791         case 1: /* same handling for 1 and 2 */
 792         case 2:
 793                 mem = get_zeroed_page(GFP_KERNEL);
 794                 if (!mem)
 795                         goto out_no_data;
 796                 if (stsi((void *) mem, fc, sel1, sel2))
 797                         goto out_no_data;
 798                 break;
 799         case 3:
 800                 if (sel1 != 2 || sel2 != 2)
 801                         goto out_no_data;
 802                 mem = get_zeroed_page(GFP_KERNEL);
 803                 if (!mem)
 804                         goto out_no_data;
 805                 handle_stsi_3_2_2(vcpu, (void *) mem);
 806                 break;
 807         }
 808
 809         rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE);
 810         if (rc) {
 811                 rc = kvm_s390_inject_prog_cond(vcpu, rc);
 812                 goto out;
 813         }
 814         if (vcpu->kvm->arch.user_stsi) {
 815                 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
 816                 rc = -EREMOTE;
 817         }
 818         trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
 819         free_page(mem);
 820         kvm_s390_set_psw_cc(vcpu, 0);
 821         vcpu->run->s.regs.gprs[0] = 0;
 822         return rc;
 823 out_no_data:
 824         kvm_s390_set_psw_cc(vcpu, 3);
 825 out:
 826         free_page(mem);
 827         return rc;
 828 }
 829
 830 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
 831 {
 832         switch (vcpu->arch.sie_block->ipa & 0x00ff) {
 833         case 0x02:
 834                 return handle_stidp(vcpu);
 835         case 0x04:
 836                 return handle_set_clock(vcpu);
 837         case 0x10:
 838                 return handle_set_prefix(vcpu);
 839         case 0x11:
 840                 return handle_store_prefix(vcpu);
 841         case 0x12:
 842                 return handle_store_cpu_address(vcpu);
 843         case 0x14:
 844                 return kvm_s390_handle_vsie(vcpu);
 845         case 0x21:
 846         case 0x50:
 847                 return handle_ipte_interlock(vcpu);
 848         case 0x29:
 849                 return handle_iske(vcpu);
 850         case 0x2a:
 851                 return handle_rrbe(vcpu);
 852         case 0x2b:
 853                 return handle_sske(vcpu);
 854         case 0x2c:
 855                 return handle_test_block(vcpu);
 856         case 0x30:
 857         case 0x31:
 858         case 0x32:
 859         case 0x33:
 860         case 0x34:
 861         case 0x35:
 862         case 0x36:
 863         case 0x37:
 864         case 0x38:
 865         case 0x39:
 866         case 0x3a:
 867         case 0x3b:
 868         case 0x3c:
 869         case 0x5f:
 870         case 0x74:
 871         case 0x76:
 872                 return handle_io_inst(vcpu);
 873         case 0x56:
 874                 return handle_sthyi(vcpu);
 875         case 0x7d:
 876                 return handle_stsi(vcpu);
 877         case 0xb1:
 878                 return handle_stfl(vcpu);
 879         case 0xb2:
 880                 return handle_lpswe(vcpu);
 881         default:
 882                 return -EOPNOTSUPP;
 883         }
 884 }
 885
 886 static int handle_epsw(struct kvm_vcpu *vcpu)
 887 {
 888         int reg1, reg2;
 889
 890         vcpu->stat.instruction_epsw++;
 891
 892         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 893
 894         /* This basically extracts the mask half of the psw. */
 895         vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
 896         vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
 897         if (reg2) {
 898                 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
 899                 vcpu->run->s.regs.gprs[reg2] |=
 900                         vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
 901         }
 902         return 0;
 903 }
 904
 905 #define PFMF_RESERVED   0xfffc0101UL
 906 #define PFMF_SK         0x00020000UL
 907 #define PFMF_CF         0x00010000UL
 908 #define PFMF_UI         0x00008000UL
 909 #define PFMF_FSC        0x00007000UL
 910 #define PFMF_NQ         0x00000800UL
 911 #define PFMF_MR         0x00000400UL
 912 #define PFMF_MC         0x00000200UL
 913 #define PFMF_KEY        0x000000feUL
 914
 915 static int handle_pfmf(struct kvm_vcpu *vcpu)
 916 {
 917         bool mr = false, mc = false, nq;
 918         int reg1, reg2;
 919         unsigned long start, end;
 920         unsigned char key;
 921
 922         vcpu->stat.instruction_pfmf++;
 923
 924         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 925
 926         if (!test_kvm_facility(vcpu->kvm, 8))
 927                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
 928
 929         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 930                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 931
 932         if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
 933                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 934
 935         /* Only provide non-quiescing support if enabled for the guest */
 936         if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ &&
 937             !test_kvm_facility(vcpu->kvm, 14))
 938                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 939
 940         /* Only provide conditional-SSKE support if enabled for the guest */
 941         if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK &&
 942             test_kvm_facility(vcpu->kvm, 10)) {
 943                 mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR;
 944                 mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC;
 945         }
 946
 947         nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ;
 948         key = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY;
 949         start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 950         start = kvm_s390_logical_to_effective(vcpu, start);
 951
 952         if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
 953                 if (kvm_s390_check_low_addr_prot_real(vcpu, start))
 954                         return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
 955         }
 956
 957         switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
 958         case 0x00000000:
 959                 /* only 4k frames specify a real address */
 960                 start = kvm_s390_real_to_abs(vcpu, start);
 961                 end = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1);
 962                 break;
 963         case 0x00001000:
 964                 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
 965                 break;
 966         case 0x00002000:
 967                 /* only support 2G frame size if EDAT2 is available and we are
 968                    not in 24-bit addressing mode */
 969                 if (!test_kvm_facility(vcpu->kvm, 78) ||
 970                     psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_24BIT)
 971                         return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 972                 end = (start + _REGION3_SIZE) & ~(_REGION3_SIZE - 1);
 973                 break;
 974         default:
 975                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 976         }
 977
 978         while (start != end) {
 979                 unsigned long vmaddr;
 980                 bool unlocked = false;
 981
 982                 /* Translate guest address to host address */
 983                 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
 984                 if (kvm_is_error_hva(vmaddr))
 985                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 986
 987                 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
 988                         if (kvm_clear_guest(vcpu->kvm, start, PAGE_SIZE))
 989                                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 990                 }
 991
 992                 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
 993                         int rc = kvm_s390_skey_check_enable(vcpu);
 994
 995                         if (rc)
 996                                 return rc;
 997                         down_read(&current->mm->mmap_sem);
 998                         rc = cond_set_guest_storage_key(current->mm, vmaddr,
 999                                                         key, NULL, nq, mr, mc);
1000                         if (rc < 0) {
1001                                 rc = fixup_user_fault(current, current->mm, vmaddr,
1002                                                       FAULT_FLAG_WRITE, &unlocked);
1003                                 rc = !rc ? -EAGAIN : rc;
1004                         }
1005                         if (rc == -EFAULT)
1006                                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1007
1008                         up_read(&current->mm->mmap_sem);
1009                         if (rc >= 0)
1010                                 start += PAGE_SIZE;
1011                 }
1012         }
1013         if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
1014                 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) {
1015                         vcpu->run->s.regs.gprs[reg2] = end;
1016                 } else {
1017                         vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL;
1018                         end = kvm_s390_logical_to_effective(vcpu, end);
1019                         vcpu->run->s.regs.gprs[reg2] |= end;
1020                 }
1021         }
1022         return 0;
1023 }
1024
1025 /*
1026  * Must be called with relevant read locks held (kvm->mm->mmap_sem, kvm->srcu)
1027  */
1028 static inline int __do_essa(struct kvm_vcpu *vcpu, const int orc)
1029 {
1030         int r1, r2, nappended, entries;
1031         unsigned long gfn, hva, res, pgstev, ptev;
1032         unsigned long *cbrlo;
1033
1034         /*
1035          * We don't need to set SD.FPF.SK to 1 here, because if we have a
1036          * machine check here we either handle it or crash
1037          */
1038
1039         kvm_s390_get_regs_rre(vcpu, &r1, &r2);
1040         gfn = vcpu->run->s.regs.gprs[r2] >> PAGE_SHIFT;
1041         hva = gfn_to_hva(vcpu->kvm, gfn);
1042         entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1043
1044         if (kvm_is_error_hva(hva))
1045                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1046
1047         nappended = pgste_perform_essa(vcpu->kvm->mm, hva, orc, &ptev, &pgstev);
1048         if (nappended < 0) {
1049                 res = orc ? 0x10 : 0;
1050                 vcpu->run->s.regs.gprs[r1] = res; /* Exception Indication */
1051                 return 0;
1052         }
1053         res = (pgstev & _PGSTE_GPS_USAGE_MASK) >> 22;
1054         /*
1055          * Set the block-content state part of the result. 0 means resident, so
1056          * nothing to do if the page is valid. 2 is for preserved pages
1057          * (non-present and non-zero), and 3 for zero pages (non-present and
1058          * zero).
1059          */
1060         if (ptev & _PAGE_INVALID) {
1061                 res |= 2;
1062                 if (pgstev & _PGSTE_GPS_ZERO)
1063                         res |= 1;
1064         }
1065         if (pgstev & _PGSTE_GPS_NODAT)
1066                 res |= 0x20;
1067         vcpu->run->s.regs.gprs[r1] = res;
1068         /*
1069          * It is possible that all the normal 511 slots were full, in which case
1070          * we will now write in the 512th slot, which is reserved for host use.
1071          * In both cases we let the normal essa handling code process all the
1072          * slots, including the reserved one, if needed.
1073          */
1074         if (nappended > 0) {
1075                 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo & PAGE_MASK);
1076                 cbrlo[entries] = gfn << PAGE_SHIFT;
1077         }
1078
1079         if (orc) {
1080                 struct kvm_memory_slot *ms = gfn_to_memslot(vcpu->kvm, gfn);
1081
1082                 /* Increment only if we are really flipping the bit */
1083                 if (ms && !test_and_set_bit(gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms)))
1084                         atomic64_inc(&vcpu->kvm->arch.cmma_dirty_pages);
1085         }
1086
1087         return nappended;
1088 }
1089
1090 static int handle_essa(struct kvm_vcpu *vcpu)
1091 {
1092         /* entries expected to be 1FF */
1093         int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1094         unsigned long *cbrlo;
1095         struct gmap *gmap;
1096         int i, orc;
1097
1098         VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries);
1099         gmap = vcpu->arch.gmap;
1100         vcpu->stat.instruction_essa++;
1101         if (!vcpu->kvm->arch.use_cmma)
1102                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1103
1104         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1105                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1106         /* Check for invalid operation request code */
1107         orc = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
1108         /* ORCs 0-6 are always valid */
1109         if (orc > (test_kvm_facility(vcpu->kvm, 147) ? ESSA_SET_STABLE_NODAT
1110                                                 : ESSA_SET_STABLE_IF_RESIDENT))
1111                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1112
1113         if (!vcpu->kvm->arch.migration_mode) {
1114                 /*
1115                  * CMMA is enabled in the KVM settings, but is disabled in
1116                  * the SIE block and in the mm_context, and we are not doing
1117                  * a migration. Enable CMMA in the mm_context.
1118                  * Since we need to take a write lock to write to the context
1119                  * to avoid races with storage keys handling, we check if the
1120                  * value really needs to be written to; if the value is
1121                  * already correct, we do nothing and avoid the lock.
1122                  */
1123                 if (vcpu->kvm->mm->context.uses_cmm == 0) {
1124                         down_write(&vcpu->kvm->mm->mmap_sem);
1125                         vcpu->kvm->mm->context.uses_cmm = 1;
1126                         up_write(&vcpu->kvm->mm->mmap_sem);
1127                 }
1128                 /*
1129                  * If we are here, we are supposed to have CMMA enabled in
1130                  * the SIE block. Enabling CMMA works on a per-CPU basis,
1131                  * while the context use_cmma flag is per process.
1132                  * It's possible that the context flag is enabled and the
1133                  * SIE flag is not, so we set the flag always; if it was
1134                  * already set, nothing changes, otherwise we enable it
1135                  * on this CPU too.
1136                  */
1137                 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
1138                 /* Retry the ESSA instruction */
1139                 kvm_s390_retry_instr(vcpu);
1140         } else {
1141                 int srcu_idx;
1142
1143                 down_read(&vcpu->kvm->mm->mmap_sem);
1144                 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
1145                 i = __do_essa(vcpu, orc);
1146                 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
1147                 up_read(&vcpu->kvm->mm->mmap_sem);
1148                 if (i < 0)
1149                         return i;
1150                 /* Account for the possible extra cbrl entry */
1151                 entries += i;
1152         }
1153         vcpu->arch.sie_block->cbrlo &= PAGE_MASK;       /* reset nceo */
1154         cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
1155         down_read(&gmap->mm->mmap_sem);
1156         for (i = 0; i < entries; ++i)
1157                 __gmap_zap(gmap, cbrlo[i]);
1158         up_read(&gmap->mm->mmap_sem);
1159         return 0;
1160 }
1161
1162 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
1163 {
1164         switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1165         case 0x8a:
1166         case 0x8e:
1167         case 0x8f:
1168                 return handle_ipte_interlock(vcpu);
1169         case 0x8d:
1170                 return handle_epsw(vcpu);
1171         case 0xab:
1172                 return handle_essa(vcpu);
1173         case 0xaf:
1174                 return handle_pfmf(vcpu);
1175         default:
1176                 return -EOPNOTSUPP;
1177         }
1178 }
1179
1180 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
1181 {
1182         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1183         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1184         int reg, rc, nr_regs;
1185         u32 ctl_array[16];
1186         u64 ga;
1187         u8 ar;
1188
1189         vcpu->stat.instruction_lctl++;
1190
1191         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1192                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1193
1194         ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1195
1196         if (ga & 3)
1197                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1198
1199         VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1200         trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga);
1201
1202         nr_regs = ((reg3 - reg1) & 0xf) + 1;
1203         rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1204         if (rc)
1205                 return kvm_s390_inject_prog_cond(vcpu, rc);
1206         reg = reg1;
1207         nr_regs = 0;
1208         do {
1209                 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
1210                 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++];
1211                 if (reg == reg3)
1212                         break;
1213                 reg = (reg + 1) % 16;
1214         } while (1);
1215         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1216         return 0;
1217 }
1218
1219 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu)
1220 {
1221         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1222         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1223         int reg, rc, nr_regs;
1224         u32 ctl_array[16];
1225         u64 ga;
1226         u8 ar;
1227
1228         vcpu->stat.instruction_stctl++;
1229
1230         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1231                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1232
1233         ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1234
1235         if (ga & 3)
1236                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1237
1238         VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1239         trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga);
1240
1241         reg = reg1;
1242         nr_regs = 0;
1243         do {
1244                 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1245                 if (reg == reg3)
1246                         break;
1247                 reg = (reg + 1) % 16;
1248         } while (1);
1249         rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1250         return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1251 }
1252
1253 static int handle_lctlg(struct kvm_vcpu *vcpu)
1254 {
1255         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1256         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1257         int reg, rc, nr_regs;
1258         u64 ctl_array[16];
1259         u64 ga;
1260         u8 ar;
1261
1262         vcpu->stat.instruction_lctlg++;
1263
1264         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1265                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1266
1267         ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1268
1269         if (ga & 7)
1270                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1271
1272         VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1273         trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga);
1274
1275         nr_regs = ((reg3 - reg1) & 0xf) + 1;
1276         rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1277         if (rc)
1278                 return kvm_s390_inject_prog_cond(vcpu, rc);
1279         reg = reg1;
1280         nr_regs = 0;
1281         do {
1282                 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++];
1283                 if (reg == reg3)
1284                         break;
1285                 reg = (reg + 1) % 16;
1286         } while (1);
1287         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1288         return 0;
1289 }
1290
1291 static int handle_stctg(struct kvm_vcpu *vcpu)
1292 {
1293         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1294         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1295         int reg, rc, nr_regs;
1296         u64 ctl_array[16];
1297         u64 ga;
1298         u8 ar;
1299
1300         vcpu->stat.instruction_stctg++;
1301
1302         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1303                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1304
1305         ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1306
1307         if (ga & 7)
1308                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1309
1310         VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1311         trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga);
1312
1313         reg = reg1;
1314         nr_regs = 0;
1315         do {
1316                 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1317                 if (reg == reg3)
1318                         break;
1319                 reg = (reg + 1) % 16;
1320         } while (1);
1321         rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1322         return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1323 }
1324
1325 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
1326 {
1327         switch (vcpu->arch.sie_block->ipb & 0x000000ff) {
1328         case 0x25:
1329                 return handle_stctg(vcpu);
1330         case 0x2f:
1331                 return handle_lctlg(vcpu);
1332         case 0x60:
1333         case 0x61:
1334         case 0x62:
1335                 return handle_ri(vcpu);
1336         default:
1337                 return -EOPNOTSUPP;
1338         }
1339 }
1340
1341 static int handle_tprot(struct kvm_vcpu *vcpu)
1342 {
1343         u64 address1, address2;
1344         unsigned long hva, gpa;
1345         int ret = 0, cc = 0;
1346         bool writable;
1347         u8 ar;
1348
1349         vcpu->stat.instruction_tprot++;
1350
1351         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1352                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1353
1354         kvm_s390_get_base_disp_sse(vcpu, &address1, &address2, &ar, NULL);
1355
1356         /* we only handle the Linux memory detection case:
1357          * access key == 0
1358          * everything else goes to userspace. */
1359         if (address2 & 0xf0)
1360                 return -EOPNOTSUPP;
1361         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1362                 ipte_lock(vcpu);
1363         ret = guest_translate_address(vcpu, address1, ar, &gpa, GACC_STORE);
1364         if (ret == PGM_PROTECTION) {
1365                 /* Write protected? Try again with read-only... */
1366                 cc = 1;
1367                 ret = guest_translate_address(vcpu, address1, ar, &gpa,
1368                                               GACC_FETCH);
1369         }
1370         if (ret) {
1371                 if (ret == PGM_ADDRESSING || ret == PGM_TRANSLATION_SPEC) {
1372                         ret = kvm_s390_inject_program_int(vcpu, ret);
1373                 } else if (ret > 0) {
1374                         /* Translation not available */
1375                         kvm_s390_set_psw_cc(vcpu, 3);
1376                         ret = 0;
1377                 }
1378                 goto out_unlock;
1379         }
1380
1381         hva = gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable);
1382         if (kvm_is_error_hva(hva)) {
1383                 ret = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1384         } else {
1385                 if (!writable)
1386                         cc = 1;         /* Write not permitted ==> read-only */
1387                 kvm_s390_set_psw_cc(vcpu, cc);
1388                 /* Note: CC2 only occurs for storage keys (not supported yet) */
1389         }
1390 out_unlock:
1391         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1392                 ipte_unlock(vcpu);
1393         return ret;
1394 }
1395
1396 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
1397 {
1398         switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1399         case 0x01:
1400                 return handle_tprot(vcpu);
1401         default:
1402                 return -EOPNOTSUPP;
1403         }
1404 }
1405
1406 static int handle_sckpf(struct kvm_vcpu *vcpu)
1407 {
1408         u32 value;
1409
1410         vcpu->stat.instruction_sckpf++;
1411
1412         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1413                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1414
1415         if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
1416                 return kvm_s390_inject_program_int(vcpu,
1417                                                    PGM_SPECIFICATION);
1418
1419         value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
1420         vcpu->arch.sie_block->todpr = value;
1421
1422         return 0;
1423 }
1424
1425 static int handle_ptff(struct kvm_vcpu *vcpu)
1426 {
1427         vcpu->stat.instruction_ptff++;
1428
1429         /* we don't emulate any control instructions yet */
1430         kvm_s390_set_psw_cc(vcpu, 3);
1431         return 0;
1432 }
1433
1434 int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
1435 {
1436         switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1437         case 0x04:
1438                 return handle_ptff(vcpu);
1439         case 0x07:
1440                 return handle_sckpf(vcpu);
1441         default:
1442                 return -EOPNOTSUPP;
1443         }
1444 }