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         up_read(&current->mm->mmap_sem);
 284         if (rc == -EFAULT)
 285                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 286         if (rc < 0)
 287                 return rc;
 288         vcpu->run->s.regs.gprs[reg1] &= ~0xff;
 289         vcpu->run->s.regs.gprs[reg1] |= key;
 290         return 0;
 291 }
 292
 293 static int handle_rrbe(struct kvm_vcpu *vcpu)
 294 {
 295         unsigned long vmaddr, gaddr;
 296         int reg1, reg2;
 297         bool unlocked;
 298         int rc;
 299
 300         vcpu->stat.instruction_rrbe++;
 301
 302         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 303                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 304
 305         rc = try_handle_skey(vcpu);
 306         if (rc)
 307                 return rc != -EAGAIN ? rc : 0;
 308
 309         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 310
 311         gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 312         gaddr = kvm_s390_logical_to_effective(vcpu, gaddr);
 313         gaddr = kvm_s390_real_to_abs(vcpu, gaddr);
 314         vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr));
 315         if (kvm_is_error_hva(vmaddr))
 316                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 317 retry:
 318         unlocked = false;
 319         down_read(&current->mm->mmap_sem);
 320         rc = reset_guest_reference_bit(current->mm, vmaddr);
 321         if (rc < 0) {
 322                 rc = fixup_user_fault(current, current->mm, vmaddr,
 323                                       FAULT_FLAG_WRITE, &unlocked);
 324                 if (!rc) {
 325                         up_read(&current->mm->mmap_sem);
 326                         goto retry;
 327                 }
 328         }
 329         up_read(&current->mm->mmap_sem);
 330         if (rc == -EFAULT)
 331                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 332         if (rc < 0)
 333                 return rc;
 334         kvm_s390_set_psw_cc(vcpu, rc);
 335         return 0;
 336 }
 337
 338 #define SSKE_NQ 0x8
 339 #define SSKE_MR 0x4
 340 #define SSKE_MC 0x2
 341 #define SSKE_MB 0x1
 342 static int handle_sske(struct kvm_vcpu *vcpu)
 343 {
 344         unsigned char m3 = vcpu->arch.sie_block->ipb >> 28;
 345         unsigned long start, end;
 346         unsigned char key, oldkey;
 347         int reg1, reg2;
 348         bool unlocked;
 349         int rc;
 350
 351         vcpu->stat.instruction_sske++;
 352
 353         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 354                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 355
 356         rc = try_handle_skey(vcpu);
 357         if (rc)
 358                 return rc != -EAGAIN ? rc : 0;
 359
 360         if (!test_kvm_facility(vcpu->kvm, 8))
 361                 m3 &= ~SSKE_MB;
 362         if (!test_kvm_facility(vcpu->kvm, 10))
 363                 m3 &= ~(SSKE_MC | SSKE_MR);
 364         if (!test_kvm_facility(vcpu->kvm, 14))
 365                 m3 &= ~SSKE_NQ;
 366
 367         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 368
 369         key = vcpu->run->s.regs.gprs[reg1] & 0xfe;
 370         start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 371         start = kvm_s390_logical_to_effective(vcpu, start);
 372         if (m3 & SSKE_MB) {
 373                 /* start already designates an absolute address */
 374                 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
 375         } else {
 376                 start = kvm_s390_real_to_abs(vcpu, start);
 377                 end = start + PAGE_SIZE;
 378         }
 379
 380         while (start != end) {
 381                 unsigned long vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
 382                 unlocked = false;
 383
 384                 if (kvm_is_error_hva(vmaddr))
 385                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 386
 387                 down_read(&current->mm->mmap_sem);
 388                 rc = cond_set_guest_storage_key(current->mm, vmaddr, key, &oldkey,
 389                                                 m3 & SSKE_NQ, m3 & SSKE_MR,
 390                                                 m3 & SSKE_MC);
 391
 392                 if (rc < 0) {
 393                         rc = fixup_user_fault(current, current->mm, vmaddr,
 394                                               FAULT_FLAG_WRITE, &unlocked);
 395                         rc = !rc ? -EAGAIN : rc;
 396                 }
 397                 up_read(&current->mm->mmap_sem);
 398                 if (rc == -EFAULT)
 399                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 400                 if (rc < 0)
 401                         return rc;
 402                 start += PAGE_SIZE;
 403         }
 404
 405         if (m3 & (SSKE_MC | SSKE_MR)) {
 406                 if (m3 & SSKE_MB) {
 407                         /* skey in reg1 is unpredictable */
 408                         kvm_s390_set_psw_cc(vcpu, 3);
 409                 } else {
 410                         kvm_s390_set_psw_cc(vcpu, rc);
 411                         vcpu->run->s.regs.gprs[reg1] &= ~0xff00UL;
 412                         vcpu->run->s.regs.gprs[reg1] |= (u64) oldkey << 8;
 413                 }
 414         }
 415         if (m3 & SSKE_MB) {
 416                 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT)
 417                         vcpu->run->s.regs.gprs[reg2] &= ~PAGE_MASK;
 418                 else
 419                         vcpu->run->s.regs.gprs[reg2] &= ~0xfffff000UL;
 420                 end = kvm_s390_logical_to_effective(vcpu, end);
 421                 vcpu->run->s.regs.gprs[reg2] |= end;
 422         }
 423         return 0;
 424 }
 425
 426 static int handle_ipte_interlock(struct kvm_vcpu *vcpu)
 427 {
 428         vcpu->stat.instruction_ipte_interlock++;
 429         if (psw_bits(vcpu->arch.sie_block->gpsw).pstate)
 430                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 431         wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu));
 432         kvm_s390_retry_instr(vcpu);
 433         VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation");
 434         return 0;
 435 }
 436
 437 static int handle_test_block(struct kvm_vcpu *vcpu)
 438 {
 439         gpa_t addr;
 440         int reg2;
 441
 442         vcpu->stat.instruction_tb++;
 443
 444         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 445                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 446
 447         kvm_s390_get_regs_rre(vcpu, NULL, &reg2);
 448         addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 449         addr = kvm_s390_logical_to_effective(vcpu, addr);
 450         if (kvm_s390_check_low_addr_prot_real(vcpu, addr))
 451                 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
 452         addr = kvm_s390_real_to_abs(vcpu, addr);
 453
 454         if (kvm_is_error_gpa(vcpu->kvm, addr))
 455                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 456         /*
 457          * We don't expect errors on modern systems, and do not care
 458          * about storage keys (yet), so let's just clear the page.
 459          */
 460         if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE))
 461                 return -EFAULT;
 462         kvm_s390_set_psw_cc(vcpu, 0);
 463         vcpu->run->s.regs.gprs[0] = 0;
 464         return 0;
 465 }
 466
 467 static int handle_tpi(struct kvm_vcpu *vcpu)
 468 {
 469         struct kvm_s390_interrupt_info *inti;
 470         unsigned long len;
 471         u32 tpi_data[3];
 472         int rc;
 473         u64 addr;
 474         u8 ar;
 475
 476         vcpu->stat.instruction_tpi++;
 477
 478         addr = kvm_s390_get_base_disp_s(vcpu, &ar);
 479         if (addr & 3)
 480                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 481
 482         inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0);
 483         if (!inti) {
 484                 kvm_s390_set_psw_cc(vcpu, 0);
 485                 return 0;
 486         }
 487
 488         tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr;
 489         tpi_data[1] = inti->io.io_int_parm;
 490         tpi_data[2] = inti->io.io_int_word;
 491         if (addr) {
 492                 /*
 493                  * Store the two-word I/O interruption code into the
 494                  * provided area.
 495                  */
 496                 len = sizeof(tpi_data) - 4;
 497                 rc = write_guest(vcpu, addr, ar, &tpi_data, len);
 498                 if (rc) {
 499                         rc = kvm_s390_inject_prog_cond(vcpu, rc);
 500                         goto reinject_interrupt;
 501                 }
 502         } else {
 503                 /*
 504                  * Store the three-word I/O interruption code into
 505                  * the appropriate lowcore area.
 506                  */
 507                 len = sizeof(tpi_data);
 508                 if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) {
 509                         /* failed writes to the low core are not recoverable */
 510                         rc = -EFAULT;
 511                         goto reinject_interrupt;
 512                 }
 513         }
 514
 515         /* irq was successfully handed to the guest */
 516         kfree(inti);
 517         kvm_s390_set_psw_cc(vcpu, 1);
 518         return 0;
 519 reinject_interrupt:
 520         /*
 521          * If we encounter a problem storing the interruption code, the
 522          * instruction is suppressed from the guest's view: reinject the
 523          * interrupt.
 524          */
 525         if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) {
 526                 kfree(inti);
 527                 rc = -EFAULT;
 528         }
 529         /* don't set the cc, a pgm irq was injected or we drop to user space */
 530         return rc ? -EFAULT : 0;
 531 }
 532
 533 static int handle_tsch(struct kvm_vcpu *vcpu)
 534 {
 535         struct kvm_s390_interrupt_info *inti = NULL;
 536         const u64 isc_mask = 0xffUL << 24; /* all iscs set */
 537
 538         vcpu->stat.instruction_tsch++;
 539
 540         /* a valid schid has at least one bit set */
 541         if (vcpu->run->s.regs.gprs[1])
 542                 inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask,
 543                                            vcpu->run->s.regs.gprs[1]);
 544
 545         /*
 546          * Prepare exit to userspace.
 547          * We indicate whether we dequeued a pending I/O interrupt
 548          * so that userspace can re-inject it if the instruction gets
 549          * a program check. While this may re-order the pending I/O
 550          * interrupts, this is no problem since the priority is kept
 551          * intact.
 552          */
 553         vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
 554         vcpu->run->s390_tsch.dequeued = !!inti;
 555         if (inti) {
 556                 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
 557                 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
 558                 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
 559                 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
 560         }
 561         vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
 562         kfree(inti);
 563         return -EREMOTE;
 564 }
 565
 566 static int handle_io_inst(struct kvm_vcpu *vcpu)
 567 {
 568         VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
 569
 570         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 571                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 572
 573         if (vcpu->kvm->arch.css_support) {
 574                 /*
 575                  * Most I/O instructions will be handled by userspace.
 576                  * Exceptions are tpi and the interrupt portion of tsch.
 577                  */
 578                 if (vcpu->arch.sie_block->ipa == 0xb236)
 579                         return handle_tpi(vcpu);
 580                 if (vcpu->arch.sie_block->ipa == 0xb235)
 581                         return handle_tsch(vcpu);
 582                 /* Handle in userspace. */
 583                 vcpu->stat.instruction_io_other++;
 584                 return -EOPNOTSUPP;
 585         } else {
 586                 /*
 587                  * Set condition code 3 to stop the guest from issuing channel
 588                  * I/O instructions.
 589                  */
 590                 kvm_s390_set_psw_cc(vcpu, 3);
 591                 return 0;
 592         }
 593 }
 594
 595 static int handle_stfl(struct kvm_vcpu *vcpu)
 596 {
 597         int rc;
 598         unsigned int fac;
 599
 600         vcpu->stat.instruction_stfl++;
 601
 602         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 603                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 604
 605         /*
 606          * We need to shift the lower 32 facility bits (bit 0-31) from a u64
 607          * into a u32 memory representation. They will remain bits 0-31.
 608          */
 609         fac = *vcpu->kvm->arch.model.fac_list >> 32;
 610         rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list),
 611                             &fac, sizeof(fac));
 612         if (rc)
 613                 return rc;
 614         VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac);
 615         trace_kvm_s390_handle_stfl(vcpu, fac);
 616         return 0;
 617 }
 618
 619 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
 620 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
 621 #define PSW_ADDR_24 0x0000000000ffffffUL
 622 #define PSW_ADDR_31 0x000000007fffffffUL
 623
 624 int is_valid_psw(psw_t *psw)
 625 {
 626         if (psw->mask & PSW_MASK_UNASSIGNED)
 627                 return 0;
 628         if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
 629                 if (psw->addr & ~PSW_ADDR_31)
 630                         return 0;
 631         }
 632         if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
 633                 return 0;
 634         if ((psw->mask & PSW_MASK_ADDR_MODE) ==  PSW_MASK_EA)
 635                 return 0;
 636         if (psw->addr & 1)
 637                 return 0;
 638         return 1;
 639 }
 640
 641 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
 642 {
 643         psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
 644         psw_compat_t new_psw;
 645         u64 addr;
 646         int rc;
 647         u8 ar;
 648
 649         vcpu->stat.instruction_lpsw++;
 650
 651         if (gpsw->mask & PSW_MASK_PSTATE)
 652                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 653
 654         addr = kvm_s390_get_base_disp_s(vcpu, &ar);
 655         if (addr & 7)
 656                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 657
 658         rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
 659         if (rc)
 660                 return kvm_s390_inject_prog_cond(vcpu, rc);
 661         if (!(new_psw.mask & PSW32_MASK_BASE))
 662                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 663         gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
 664         gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
 665         gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
 666         if (!is_valid_psw(gpsw))
 667                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 668         return 0;
 669 }
 670
 671 static int handle_lpswe(struct kvm_vcpu *vcpu)
 672 {
 673         psw_t new_psw;
 674         u64 addr;
 675         int rc;
 676         u8 ar;
 677
 678         vcpu->stat.instruction_lpswe++;
 679
 680         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 681                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 682
 683         addr = kvm_s390_get_base_disp_s(vcpu, &ar);
 684         if (addr & 7)
 685                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 686         rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
 687         if (rc)
 688                 return kvm_s390_inject_prog_cond(vcpu, rc);
 689         vcpu->arch.sie_block->gpsw = new_psw;
 690         if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
 691                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 692         return 0;
 693 }
 694
 695 static int handle_stidp(struct kvm_vcpu *vcpu)
 696 {
 697         u64 stidp_data = vcpu->kvm->arch.model.cpuid;
 698         u64 operand2;
 699         int rc;
 700         u8 ar;
 701
 702         vcpu->stat.instruction_stidp++;
 703
 704         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 705                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 706
 707         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 708
 709         if (operand2 & 7)
 710                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 711
 712         rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data));
 713         if (rc)
 714                 return kvm_s390_inject_prog_cond(vcpu, rc);
 715
 716         VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data);
 717         return 0;
 718 }
 719
 720 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
 721 {
 722         int cpus = 0;
 723         int n;
 724
 725         cpus = atomic_read(&vcpu->kvm->online_vcpus);
 726
 727         /* deal with other level 3 hypervisors */
 728         if (stsi(mem, 3, 2, 2))
 729                 mem->count = 0;
 730         if (mem->count < 8)
 731                 mem->count++;
 732         for (n = mem->count - 1; n > 0 ; n--)
 733                 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
 734
 735         memset(&mem->vm[0], 0, sizeof(mem->vm[0]));
 736         mem->vm[0].cpus_total = cpus;
 737         mem->vm[0].cpus_configured = cpus;
 738         mem->vm[0].cpus_standby = 0;
 739         mem->vm[0].cpus_reserved = 0;
 740         mem->vm[0].caf = 1000;
 741         memcpy(mem->vm[0].name, "KVMguest", 8);
 742         ASCEBC(mem->vm[0].name, 8);
 743         memcpy(mem->vm[0].cpi, "KVM/Linux       ", 16);
 744         ASCEBC(mem->vm[0].cpi, 16);
 745 }
 746
 747 static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, u8 ar,
 748                                  u8 fc, u8 sel1, u16 sel2)
 749 {
 750         vcpu->run->exit_reason = KVM_EXIT_S390_STSI;
 751         vcpu->run->s390_stsi.addr = addr;
 752         vcpu->run->s390_stsi.ar = ar;
 753         vcpu->run->s390_stsi.fc = fc;
 754         vcpu->run->s390_stsi.sel1 = sel1;
 755         vcpu->run->s390_stsi.sel2 = sel2;
 756 }
 757
 758 static int handle_stsi(struct kvm_vcpu *vcpu)
 759 {
 760         int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
 761         int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
 762         int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
 763         unsigned long mem = 0;
 764         u64 operand2;
 765         int rc = 0;
 766         u8 ar;
 767
 768         vcpu->stat.instruction_stsi++;
 769         VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2);
 770
 771         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 772                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 773
 774         if (fc > 3) {
 775                 kvm_s390_set_psw_cc(vcpu, 3);
 776                 return 0;
 777         }
 778
 779         if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
 780             || vcpu->run->s.regs.gprs[1] & 0xffff0000)
 781                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 782
 783         if (fc == 0) {
 784                 vcpu->run->s.regs.gprs[0] = 3 << 28;
 785                 kvm_s390_set_psw_cc(vcpu, 0);
 786                 return 0;
 787         }
 788
 789         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 790
 791         if (operand2 & 0xfff)
 792                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 793
 794         switch (fc) {
 795         case 1: /* same handling for 1 and 2 */
 796         case 2:
 797                 mem = get_zeroed_page(GFP_KERNEL);
 798                 if (!mem)
 799                         goto out_no_data;
 800                 if (stsi((void *) mem, fc, sel1, sel2))
 801                         goto out_no_data;
 802                 break;
 803         case 3:
 804                 if (sel1 != 2 || sel2 != 2)
 805                         goto out_no_data;
 806                 mem = get_zeroed_page(GFP_KERNEL);
 807                 if (!mem)
 808                         goto out_no_data;
 809                 handle_stsi_3_2_2(vcpu, (void *) mem);
 810                 break;
 811         }
 812
 813         rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE);
 814         if (rc) {
 815                 rc = kvm_s390_inject_prog_cond(vcpu, rc);
 816                 goto out;
 817         }
 818         if (vcpu->kvm->arch.user_stsi) {
 819                 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
 820                 rc = -EREMOTE;
 821         }
 822         trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
 823         free_page(mem);
 824         kvm_s390_set_psw_cc(vcpu, 0);
 825         vcpu->run->s.regs.gprs[0] = 0;
 826         return rc;
 827 out_no_data:
 828         kvm_s390_set_psw_cc(vcpu, 3);
 829 out:
 830         free_page(mem);
 831         return rc;
 832 }
 833
 834 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
 835 {
 836         switch (vcpu->arch.sie_block->ipa & 0x00ff) {
 837         case 0x02:
 838                 return handle_stidp(vcpu);
 839         case 0x04:
 840                 return handle_set_clock(vcpu);
 841         case 0x10:
 842                 return handle_set_prefix(vcpu);
 843         case 0x11:
 844                 return handle_store_prefix(vcpu);
 845         case 0x12:
 846                 return handle_store_cpu_address(vcpu);
 847         case 0x14:
 848                 return kvm_s390_handle_vsie(vcpu);
 849         case 0x21:
 850         case 0x50:
 851                 return handle_ipte_interlock(vcpu);
 852         case 0x29:
 853                 return handle_iske(vcpu);
 854         case 0x2a:
 855                 return handle_rrbe(vcpu);
 856         case 0x2b:
 857                 return handle_sske(vcpu);
 858         case 0x2c:
 859                 return handle_test_block(vcpu);
 860         case 0x30:
 861         case 0x31:
 862         case 0x32:
 863         case 0x33:
 864         case 0x34:
 865         case 0x35:
 866         case 0x36:
 867         case 0x37:
 868         case 0x38:
 869         case 0x39:
 870         case 0x3a:
 871         case 0x3b:
 872         case 0x3c:
 873         case 0x5f:
 874         case 0x74:
 875         case 0x76:
 876                 return handle_io_inst(vcpu);
 877         case 0x56:
 878                 return handle_sthyi(vcpu);
 879         case 0x7d:
 880                 return handle_stsi(vcpu);
 881         case 0xb1:
 882                 return handle_stfl(vcpu);
 883         case 0xb2:
 884                 return handle_lpswe(vcpu);
 885         default:
 886                 return -EOPNOTSUPP;
 887         }
 888 }
 889
 890 static int handle_epsw(struct kvm_vcpu *vcpu)
 891 {
 892         int reg1, reg2;
 893
 894         vcpu->stat.instruction_epsw++;
 895
 896         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 897
 898         /* This basically extracts the mask half of the psw. */
 899         vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
 900         vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
 901         if (reg2) {
 902                 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
 903                 vcpu->run->s.regs.gprs[reg2] |=
 904                         vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
 905         }
 906         return 0;
 907 }
 908
 909 #define PFMF_RESERVED   0xfffc0101UL
 910 #define PFMF_SK         0x00020000UL
 911 #define PFMF_CF         0x00010000UL
 912 #define PFMF_UI         0x00008000UL
 913 #define PFMF_FSC        0x00007000UL
 914 #define PFMF_NQ         0x00000800UL
 915 #define PFMF_MR         0x00000400UL
 916 #define PFMF_MC         0x00000200UL
 917 #define PFMF_KEY        0x000000feUL
 918
 919 static int handle_pfmf(struct kvm_vcpu *vcpu)
 920 {
 921         bool mr = false, mc = false, nq;
 922         int reg1, reg2;
 923         unsigned long start, end;
 924         unsigned char key;
 925
 926         vcpu->stat.instruction_pfmf++;
 927
 928         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 929
 930         if (!test_kvm_facility(vcpu->kvm, 8))
 931                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
 932
 933         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 934                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 935
 936         if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
 937                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 938
 939         /* Only provide non-quiescing support if enabled for the guest */
 940         if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ &&
 941             !test_kvm_facility(vcpu->kvm, 14))
 942                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 943
 944         /* Only provide conditional-SSKE support if enabled for the guest */
 945         if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK &&
 946             test_kvm_facility(vcpu->kvm, 10)) {
 947                 mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR;
 948                 mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC;
 949         }
 950
 951         nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ;
 952         key = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY;
 953         start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 954         start = kvm_s390_logical_to_effective(vcpu, start);
 955
 956         if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
 957                 if (kvm_s390_check_low_addr_prot_real(vcpu, start))
 958                         return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
 959         }
 960
 961         switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
 962         case 0x00000000:
 963                 /* only 4k frames specify a real address */
 964                 start = kvm_s390_real_to_abs(vcpu, start);
 965                 end = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1);
 966                 break;
 967         case 0x00001000:
 968                 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
 969                 break;
 970         case 0x00002000:
 971                 /* only support 2G frame size if EDAT2 is available and we are
 972                    not in 24-bit addressing mode */
 973                 if (!test_kvm_facility(vcpu->kvm, 78) ||
 974                     psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_24BIT)
 975                         return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 976                 end = (start + _REGION3_SIZE) & ~(_REGION3_SIZE - 1);
 977                 break;
 978         default:
 979                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 980         }
 981
 982         while (start != end) {
 983                 unsigned long vmaddr;
 984                 bool unlocked = false;
 985
 986                 /* Translate guest address to host address */
 987                 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
 988                 if (kvm_is_error_hva(vmaddr))
 989                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 990
 991                 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
 992                         if (kvm_clear_guest(vcpu->kvm, start, PAGE_SIZE))
 993                                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 994                 }
 995
 996                 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
 997                         int rc = kvm_s390_skey_check_enable(vcpu);
 998
 999                         if (rc)
1000                                 return rc;
1001                         down_read(&current->mm->mmap_sem);
1002                         rc = cond_set_guest_storage_key(current->mm, vmaddr,
1003                                                         key, NULL, nq, mr, mc);
1004                         if (rc < 0) {
1005                                 rc = fixup_user_fault(current, current->mm, vmaddr,
1006                                                       FAULT_FLAG_WRITE, &unlocked);
1007                                 rc = !rc ? -EAGAIN : rc;
1008                         }
1009                         up_read(&current->mm->mmap_sem);
1010                         if (rc == -EFAULT)
1011                                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1012                         if (rc == -EAGAIN)
1013                                 continue;
1014                         if (rc < 0)
1015                                 return rc;
1016                 }
1017                 start += PAGE_SIZE;
1018         }
1019         if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
1020                 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) {
1021                         vcpu->run->s.regs.gprs[reg2] = end;
1022                 } else {
1023                         vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL;
1024                         end = kvm_s390_logical_to_effective(vcpu, end);
1025                         vcpu->run->s.regs.gprs[reg2] |= end;
1026                 }
1027         }
1028         return 0;
1029 }
1030
1031 /*
1032  * Must be called with relevant read locks held (kvm->mm->mmap_sem, kvm->srcu)
1033  */
1034 static inline int __do_essa(struct kvm_vcpu *vcpu, const int orc)
1035 {
1036         int r1, r2, nappended, entries;
1037         unsigned long gfn, hva, res, pgstev, ptev;
1038         unsigned long *cbrlo;
1039
1040         /*
1041          * We don't need to set SD.FPF.SK to 1 here, because if we have a
1042          * machine check here we either handle it or crash
1043          */
1044
1045         kvm_s390_get_regs_rre(vcpu, &r1, &r2);
1046         gfn = vcpu->run->s.regs.gprs[r2] >> PAGE_SHIFT;
1047         hva = gfn_to_hva(vcpu->kvm, gfn);
1048         entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1049
1050         if (kvm_is_error_hva(hva))
1051                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1052
1053         nappended = pgste_perform_essa(vcpu->kvm->mm, hva, orc, &ptev, &pgstev);
1054         if (nappended < 0) {
1055                 res = orc ? 0x10 : 0;
1056                 vcpu->run->s.regs.gprs[r1] = res; /* Exception Indication */
1057                 return 0;
1058         }
1059         res = (pgstev & _PGSTE_GPS_USAGE_MASK) >> 22;
1060         /*
1061          * Set the block-content state part of the result. 0 means resident, so
1062          * nothing to do if the page is valid. 2 is for preserved pages
1063          * (non-present and non-zero), and 3 for zero pages (non-present and
1064          * zero).
1065          */
1066         if (ptev & _PAGE_INVALID) {
1067                 res |= 2;
1068                 if (pgstev & _PGSTE_GPS_ZERO)
1069                         res |= 1;
1070         }
1071         if (pgstev & _PGSTE_GPS_NODAT)
1072                 res |= 0x20;
1073         vcpu->run->s.regs.gprs[r1] = res;
1074         /*
1075          * It is possible that all the normal 511 slots were full, in which case
1076          * we will now write in the 512th slot, which is reserved for host use.
1077          * In both cases we let the normal essa handling code process all the
1078          * slots, including the reserved one, if needed.
1079          */
1080         if (nappended > 0) {
1081                 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo & PAGE_MASK);
1082                 cbrlo[entries] = gfn << PAGE_SHIFT;
1083         }
1084
1085         if (orc) {
1086                 struct kvm_memory_slot *ms = gfn_to_memslot(vcpu->kvm, gfn);
1087
1088                 /* Increment only if we are really flipping the bit */
1089                 if (ms && !test_and_set_bit(gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms)))
1090                         atomic64_inc(&vcpu->kvm->arch.cmma_dirty_pages);
1091         }
1092
1093         return nappended;
1094 }
1095
1096 static int handle_essa(struct kvm_vcpu *vcpu)
1097 {
1098         /* entries expected to be 1FF */
1099         int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1100         unsigned long *cbrlo;
1101         struct gmap *gmap;
1102         int i, orc;
1103
1104         VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries);
1105         gmap = vcpu->arch.gmap;
1106         vcpu->stat.instruction_essa++;
1107         if (!vcpu->kvm->arch.use_cmma)
1108                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1109
1110         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1111                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1112         /* Check for invalid operation request code */
1113         orc = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
1114         /* ORCs 0-6 are always valid */
1115         if (orc > (test_kvm_facility(vcpu->kvm, 147) ? ESSA_SET_STABLE_NODAT
1116                                                 : ESSA_SET_STABLE_IF_RESIDENT))
1117                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1118
1119         if (!vcpu->kvm->arch.migration_mode) {
1120                 /*
1121                  * CMMA is enabled in the KVM settings, but is disabled in
1122                  * the SIE block and in the mm_context, and we are not doing
1123                  * a migration. Enable CMMA in the mm_context.
1124                  * Since we need to take a write lock to write to the context
1125                  * to avoid races with storage keys handling, we check if the
1126                  * value really needs to be written to; if the value is
1127                  * already correct, we do nothing and avoid the lock.
1128                  */
1129                 if (vcpu->kvm->mm->context.uses_cmm == 0) {
1130                         down_write(&vcpu->kvm->mm->mmap_sem);
1131                         vcpu->kvm->mm->context.uses_cmm = 1;
1132                         up_write(&vcpu->kvm->mm->mmap_sem);
1133                 }
1134                 /*
1135                  * If we are here, we are supposed to have CMMA enabled in
1136                  * the SIE block. Enabling CMMA works on a per-CPU basis,
1137                  * while the context use_cmma flag is per process.
1138                  * It's possible that the context flag is enabled and the
1139                  * SIE flag is not, so we set the flag always; if it was
1140                  * already set, nothing changes, otherwise we enable it
1141                  * on this CPU too.
1142                  */
1143                 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
1144                 /* Retry the ESSA instruction */
1145                 kvm_s390_retry_instr(vcpu);
1146         } else {
1147                 int srcu_idx;
1148
1149                 down_read(&vcpu->kvm->mm->mmap_sem);
1150                 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
1151                 i = __do_essa(vcpu, orc);
1152                 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
1153                 up_read(&vcpu->kvm->mm->mmap_sem);
1154                 if (i < 0)
1155                         return i;
1156                 /* Account for the possible extra cbrl entry */
1157                 entries += i;
1158         }
1159         vcpu->arch.sie_block->cbrlo &= PAGE_MASK;       /* reset nceo */
1160         cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
1161         down_read(&gmap->mm->mmap_sem);
1162         for (i = 0; i < entries; ++i)
1163                 __gmap_zap(gmap, cbrlo[i]);
1164         up_read(&gmap->mm->mmap_sem);
1165         return 0;
1166 }
1167
1168 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
1169 {
1170         switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1171         case 0x8a:
1172         case 0x8e:
1173         case 0x8f:
1174                 return handle_ipte_interlock(vcpu);
1175         case 0x8d:
1176                 return handle_epsw(vcpu);
1177         case 0xab:
1178                 return handle_essa(vcpu);
1179         case 0xaf:
1180                 return handle_pfmf(vcpu);
1181         default:
1182                 return -EOPNOTSUPP;
1183         }
1184 }
1185
1186 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
1187 {
1188         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1189         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1190         int reg, rc, nr_regs;
1191         u32 ctl_array[16];
1192         u64 ga;
1193         u8 ar;
1194
1195         vcpu->stat.instruction_lctl++;
1196
1197         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1198                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1199
1200         ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1201
1202         if (ga & 3)
1203                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1204
1205         VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1206         trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga);
1207
1208         nr_regs = ((reg3 - reg1) & 0xf) + 1;
1209         rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1210         if (rc)
1211                 return kvm_s390_inject_prog_cond(vcpu, rc);
1212         reg = reg1;
1213         nr_regs = 0;
1214         do {
1215                 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
1216                 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++];
1217                 if (reg == reg3)
1218                         break;
1219                 reg = (reg + 1) % 16;
1220         } while (1);
1221         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1222         return 0;
1223 }
1224
1225 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu)
1226 {
1227         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1228         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1229         int reg, rc, nr_regs;
1230         u32 ctl_array[16];
1231         u64 ga;
1232         u8 ar;
1233
1234         vcpu->stat.instruction_stctl++;
1235
1236         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1237                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1238
1239         ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1240
1241         if (ga & 3)
1242                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1243
1244         VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1245         trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga);
1246
1247         reg = reg1;
1248         nr_regs = 0;
1249         do {
1250                 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1251                 if (reg == reg3)
1252                         break;
1253                 reg = (reg + 1) % 16;
1254         } while (1);
1255         rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1256         return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1257 }
1258
1259 static int handle_lctlg(struct kvm_vcpu *vcpu)
1260 {
1261         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1262         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1263         int reg, rc, nr_regs;
1264         u64 ctl_array[16];
1265         u64 ga;
1266         u8 ar;
1267
1268         vcpu->stat.instruction_lctlg++;
1269
1270         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1271                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1272
1273         ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1274
1275         if (ga & 7)
1276                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1277
1278         VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1279         trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga);
1280
1281         nr_regs = ((reg3 - reg1) & 0xf) + 1;
1282         rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1283         if (rc)
1284                 return kvm_s390_inject_prog_cond(vcpu, rc);
1285         reg = reg1;
1286         nr_regs = 0;
1287         do {
1288                 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++];
1289                 if (reg == reg3)
1290                         break;
1291                 reg = (reg + 1) % 16;
1292         } while (1);
1293         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1294         return 0;
1295 }
1296
1297 static int handle_stctg(struct kvm_vcpu *vcpu)
1298 {
1299         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1300         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1301         int reg, rc, nr_regs;
1302         u64 ctl_array[16];
1303         u64 ga;
1304         u8 ar;
1305
1306         vcpu->stat.instruction_stctg++;
1307
1308         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1309                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1310
1311         ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1312
1313         if (ga & 7)
1314                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1315
1316         VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1317         trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga);
1318
1319         reg = reg1;
1320         nr_regs = 0;
1321         do {
1322                 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1323                 if (reg == reg3)
1324                         break;
1325                 reg = (reg + 1) % 16;
1326         } while (1);
1327         rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1328         return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1329 }
1330
1331 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
1332 {
1333         switch (vcpu->arch.sie_block->ipb & 0x000000ff) {
1334         case 0x25:
1335                 return handle_stctg(vcpu);
1336         case 0x2f:
1337                 return handle_lctlg(vcpu);
1338         case 0x60:
1339         case 0x61:
1340         case 0x62:
1341                 return handle_ri(vcpu);
1342         default:
1343                 return -EOPNOTSUPP;
1344         }
1345 }
1346
1347 static int handle_tprot(struct kvm_vcpu *vcpu)
1348 {
1349         u64 address1, address2;
1350         unsigned long hva, gpa;
1351         int ret = 0, cc = 0;
1352         bool writable;
1353         u8 ar;
1354
1355         vcpu->stat.instruction_tprot++;
1356
1357         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1358                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1359
1360         kvm_s390_get_base_disp_sse(vcpu, &address1, &address2, &ar, NULL);
1361
1362         /* we only handle the Linux memory detection case:
1363          * access key == 0
1364          * everything else goes to userspace. */
1365         if (address2 & 0xf0)
1366                 return -EOPNOTSUPP;
1367         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1368                 ipte_lock(vcpu);
1369         ret = guest_translate_address(vcpu, address1, ar, &gpa, GACC_STORE);
1370         if (ret == PGM_PROTECTION) {
1371                 /* Write protected? Try again with read-only... */
1372                 cc = 1;
1373                 ret = guest_translate_address(vcpu, address1, ar, &gpa,
1374                                               GACC_FETCH);
1375         }
1376         if (ret) {
1377                 if (ret == PGM_ADDRESSING || ret == PGM_TRANSLATION_SPEC) {
1378                         ret = kvm_s390_inject_program_int(vcpu, ret);
1379                 } else if (ret > 0) {
1380                         /* Translation not available */
1381                         kvm_s390_set_psw_cc(vcpu, 3);
1382                         ret = 0;
1383                 }
1384                 goto out_unlock;
1385         }
1386
1387         hva = gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable);
1388         if (kvm_is_error_hva(hva)) {
1389                 ret = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1390         } else {
1391                 if (!writable)
1392                         cc = 1;         /* Write not permitted ==> read-only */
1393                 kvm_s390_set_psw_cc(vcpu, cc);
1394                 /* Note: CC2 only occurs for storage keys (not supported yet) */
1395         }
1396 out_unlock:
1397         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1398                 ipte_unlock(vcpu);
1399         return ret;
1400 }
1401
1402 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
1403 {
1404         switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1405         case 0x01:
1406                 return handle_tprot(vcpu);
1407         default:
1408                 return -EOPNOTSUPP;
1409         }
1410 }
1411
1412 static int handle_sckpf(struct kvm_vcpu *vcpu)
1413 {
1414         u32 value;
1415
1416         vcpu->stat.instruction_sckpf++;
1417
1418         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1419                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1420
1421         if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
1422                 return kvm_s390_inject_program_int(vcpu,
1423                                                    PGM_SPECIFICATION);
1424
1425         value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
1426         vcpu->arch.sie_block->todpr = value;
1427
1428         return 0;
1429 }
1430
1431 static int handle_ptff(struct kvm_vcpu *vcpu)
1432 {
1433         vcpu->stat.instruction_ptff++;
1434
1435         /* we don't emulate any control instructions yet */
1436         kvm_s390_set_psw_cc(vcpu, 3);
1437         return 0;
1438 }
1439
1440 int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
1441 {
1442         switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1443         case 0x04:
1444                 return handle_ptff(vcpu);
1445         case 0x07:
1446                 return handle_sckpf(vcpu);
1447         default:
1448                 return -EOPNOTSUPP;
1449         }
1450 }