arch/s390/kvm/priv.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * handling privileged instructions
   4  *
   5  * Copyright IBM Corp. 2008, 2020
   6  *
   7  *    Author(s): Carsten Otte <cotte@de.ibm.com>
   8  *               Christian Borntraeger <borntraeger@de.ibm.com>
   9  */
  10
  11 #include <linux/kvm.h>
  12 #include <linux/gfp.h>
  13 #include <linux/errno.h>
  14 #include <linux/compat.h>
  15 #include <linux/mm_types.h>
  16 #include <linux/pgtable.h>
  17
  18 #include <asm/asm-offsets.h>
  19 #include <asm/facility.h>
  20 #include <asm/current.h>
  21 #include <asm/debug.h>
  22 #include <asm/ebcdic.h>
  23 #include <asm/sysinfo.h>
  24 #include <asm/page-states.h>
  25 #include <asm/gmap.h>
  26 #include <asm/io.h>
  27 #include <asm/ptrace.h>
  28 #include <asm/sclp.h>
  29 #include <asm/ap.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         /*
 106          * To set the TOD clock the kvm lock must be taken, but the vcpu lock
 107          * is already held in handle_set_clock. The usual lock order is the
 108          * opposite.  As SCK is deprecated and should not be used in several
 109          * cases, for example when the multiple epoch facility or TOD clock
 110          * steering facility is installed (see Principles of Operation),  a
 111          * slow path can be used.  If the lock can not be taken via try_lock,
 112          * the instruction will be retried via -EAGAIN at a later point in
 113          * time.
 114          */
 115         if (!kvm_s390_try_set_tod_clock(vcpu->kvm, &gtod)) {
 116                 kvm_s390_retry_instr(vcpu);
 117                 return -EAGAIN;
 118         }
 119
 120         kvm_s390_set_psw_cc(vcpu, 0);
 121         return 0;
 122 }
 123
 124 static int handle_set_prefix(struct kvm_vcpu *vcpu)
 125 {
 126         u64 operand2;
 127         u32 address;
 128         int rc;
 129         u8 ar;
 130
 131         vcpu->stat.instruction_spx++;
 132
 133         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 134                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 135
 136         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 137
 138         /* must be word boundary */
 139         if (operand2 & 3)
 140                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 141
 142         /* get the value */
 143         rc = read_guest(vcpu, operand2, ar, &address, sizeof(address));
 144         if (rc)
 145                 return kvm_s390_inject_prog_cond(vcpu, rc);
 146
 147         address &= 0x7fffe000u;
 148
 149         /*
 150          * Make sure the new value is valid memory. We only need to check the
 151          * first page, since address is 8k aligned and memory pieces are always
 152          * at least 1MB aligned and have at least a size of 1MB.
 153          */
 154         if (kvm_is_error_gpa(vcpu->kvm, address))
 155                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 156
 157         kvm_s390_set_prefix(vcpu, address);
 158         trace_kvm_s390_handle_prefix(vcpu, 1, address);
 159         return 0;
 160 }
 161
 162 static int handle_store_prefix(struct kvm_vcpu *vcpu)
 163 {
 164         u64 operand2;
 165         u32 address;
 166         int rc;
 167         u8 ar;
 168
 169         vcpu->stat.instruction_stpx++;
 170
 171         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 172                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 173
 174         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 175
 176         /* must be word boundary */
 177         if (operand2 & 3)
 178                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 179
 180         address = kvm_s390_get_prefix(vcpu);
 181
 182         /* get the value */
 183         rc = write_guest(vcpu, operand2, ar, &address, sizeof(address));
 184         if (rc)
 185                 return kvm_s390_inject_prog_cond(vcpu, rc);
 186
 187         VCPU_EVENT(vcpu, 3, "STPX: storing prefix 0x%x into 0x%llx", address, operand2);
 188         trace_kvm_s390_handle_prefix(vcpu, 0, address);
 189         return 0;
 190 }
 191
 192 static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
 193 {
 194         u16 vcpu_id = vcpu->vcpu_id;
 195         u64 ga;
 196         int rc;
 197         u8 ar;
 198
 199         vcpu->stat.instruction_stap++;
 200
 201         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 202                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 203
 204         ga = kvm_s390_get_base_disp_s(vcpu, &ar);
 205
 206         if (ga & 1)
 207                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 208
 209         rc = write_guest(vcpu, ga, ar, &vcpu_id, sizeof(vcpu_id));
 210         if (rc)
 211                 return kvm_s390_inject_prog_cond(vcpu, rc);
 212
 213         VCPU_EVENT(vcpu, 3, "STAP: storing cpu address (%u) to 0x%llx", vcpu_id, ga);
 214         trace_kvm_s390_handle_stap(vcpu, ga);
 215         return 0;
 216 }
 217
 218 int kvm_s390_skey_check_enable(struct kvm_vcpu *vcpu)
 219 {
 220         int rc;
 221
 222         trace_kvm_s390_skey_related_inst(vcpu);
 223         /* Already enabled? */
 224         if (vcpu->arch.skey_enabled)
 225                 return 0;
 226
 227         rc = s390_enable_skey();
 228         VCPU_EVENT(vcpu, 3, "enabling storage keys for guest: %d", rc);
 229         if (rc)
 230                 return rc;
 231
 232         if (kvm_s390_test_cpuflags(vcpu, CPUSTAT_KSS))
 233                 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_KSS);
 234         if (!vcpu->kvm->arch.use_skf)
 235                 vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
 236         else
 237                 vcpu->arch.sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | ICTL_RRBE);
 238         vcpu->arch.skey_enabled = true;
 239         return 0;
 240 }
 241
 242 static int try_handle_skey(struct kvm_vcpu *vcpu)
 243 {
 244         int rc;
 245
 246         rc = kvm_s390_skey_check_enable(vcpu);
 247         if (rc)
 248                 return rc;
 249         if (vcpu->kvm->arch.use_skf) {
 250                 /* with storage-key facility, SIE interprets it for us */
 251                 kvm_s390_retry_instr(vcpu);
 252                 VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
 253                 return -EAGAIN;
 254         }
 255         return 0;
 256 }
 257
 258 static int handle_iske(struct kvm_vcpu *vcpu)
 259 {
 260         unsigned long gaddr, vmaddr;
 261         unsigned char key;
 262         int reg1, reg2;
 263         bool unlocked;
 264         int rc;
 265
 266         vcpu->stat.instruction_iske++;
 267
 268         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 269                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 270
 271         rc = try_handle_skey(vcpu);
 272         if (rc)
 273                 return rc != -EAGAIN ? rc : 0;
 274
 275         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 276
 277         gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 278         gaddr = kvm_s390_logical_to_effective(vcpu, gaddr);
 279         gaddr = kvm_s390_real_to_abs(vcpu, gaddr);
 280         vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr));
 281         if (kvm_is_error_hva(vmaddr))
 282                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 283 retry:
 284         unlocked = false;
 285         mmap_read_lock(current->mm);
 286         rc = get_guest_storage_key(current->mm, vmaddr, &key);
 287
 288         if (rc) {
 289                 rc = fixup_user_fault(current->mm, vmaddr,
 290                                       FAULT_FLAG_WRITE, &unlocked);
 291                 if (!rc) {
 292                         mmap_read_unlock(current->mm);
 293                         goto retry;
 294                 }
 295         }
 296         mmap_read_unlock(current->mm);
 297         if (rc == -EFAULT)
 298                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 299         if (rc < 0)
 300                 return rc;
 301         vcpu->run->s.regs.gprs[reg1] &= ~0xff;
 302         vcpu->run->s.regs.gprs[reg1] |= key;
 303         return 0;
 304 }
 305
 306 static int handle_rrbe(struct kvm_vcpu *vcpu)
 307 {
 308         unsigned long vmaddr, gaddr;
 309         int reg1, reg2;
 310         bool unlocked;
 311         int rc;
 312
 313         vcpu->stat.instruction_rrbe++;
 314
 315         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 316                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 317
 318         rc = try_handle_skey(vcpu);
 319         if (rc)
 320                 return rc != -EAGAIN ? rc : 0;
 321
 322         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 323
 324         gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 325         gaddr = kvm_s390_logical_to_effective(vcpu, gaddr);
 326         gaddr = kvm_s390_real_to_abs(vcpu, gaddr);
 327         vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr));
 328         if (kvm_is_error_hva(vmaddr))
 329                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 330 retry:
 331         unlocked = false;
 332         mmap_read_lock(current->mm);
 333         rc = reset_guest_reference_bit(current->mm, vmaddr);
 334         if (rc < 0) {
 335                 rc = fixup_user_fault(current->mm, vmaddr,
 336                                       FAULT_FLAG_WRITE, &unlocked);
 337                 if (!rc) {
 338                         mmap_read_unlock(current->mm);
 339                         goto retry;
 340                 }
 341         }
 342         mmap_read_unlock(current->mm);
 343         if (rc == -EFAULT)
 344                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 345         if (rc < 0)
 346                 return rc;
 347         kvm_s390_set_psw_cc(vcpu, rc);
 348         return 0;
 349 }
 350
 351 #define SSKE_NQ 0x8
 352 #define SSKE_MR 0x4
 353 #define SSKE_MC 0x2
 354 #define SSKE_MB 0x1
 355 static int handle_sske(struct kvm_vcpu *vcpu)
 356 {
 357         unsigned char m3 = vcpu->arch.sie_block->ipb >> 28;
 358         unsigned long start, end;
 359         unsigned char key, oldkey;
 360         int reg1, reg2;
 361         bool unlocked;
 362         int rc;
 363
 364         vcpu->stat.instruction_sske++;
 365
 366         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 367                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 368
 369         rc = try_handle_skey(vcpu);
 370         if (rc)
 371                 return rc != -EAGAIN ? rc : 0;
 372
 373         if (!test_kvm_facility(vcpu->kvm, 8))
 374                 m3 &= ~SSKE_MB;
 375         if (!test_kvm_facility(vcpu->kvm, 10))
 376                 m3 &= ~(SSKE_MC | SSKE_MR);
 377         if (!test_kvm_facility(vcpu->kvm, 14))
 378                 m3 &= ~SSKE_NQ;
 379
 380         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 381
 382         key = vcpu->run->s.regs.gprs[reg1] & 0xfe;
 383         start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 384         start = kvm_s390_logical_to_effective(vcpu, start);
 385         if (m3 & SSKE_MB) {
 386                 /* start already designates an absolute address */
 387                 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
 388         } else {
 389                 start = kvm_s390_real_to_abs(vcpu, start);
 390                 end = start + PAGE_SIZE;
 391         }
 392
 393         while (start != end) {
 394                 unsigned long vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
 395                 unlocked = false;
 396
 397                 if (kvm_is_error_hva(vmaddr))
 398                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 399
 400                 mmap_read_lock(current->mm);
 401                 rc = cond_set_guest_storage_key(current->mm, vmaddr, key, &oldkey,
 402                                                 m3 & SSKE_NQ, m3 & SSKE_MR,
 403                                                 m3 & SSKE_MC);
 404
 405                 if (rc < 0) {
 406                         rc = fixup_user_fault(current->mm, vmaddr,
 407                                               FAULT_FLAG_WRITE, &unlocked);
 408                         rc = !rc ? -EAGAIN : rc;
 409                 }
 410                 mmap_read_unlock(current->mm);
 411                 if (rc == -EFAULT)
 412                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 413                 if (rc == -EAGAIN)
 414                         continue;
 415                 if (rc < 0)
 416                         return rc;
 417                 start += PAGE_SIZE;
 418         }
 419
 420         if (m3 & (SSKE_MC | SSKE_MR)) {
 421                 if (m3 & SSKE_MB) {
 422                         /* skey in reg1 is unpredictable */
 423                         kvm_s390_set_psw_cc(vcpu, 3);
 424                 } else {
 425                         kvm_s390_set_psw_cc(vcpu, rc);
 426                         vcpu->run->s.regs.gprs[reg1] &= ~0xff00UL;
 427                         vcpu->run->s.regs.gprs[reg1] |= (u64) oldkey << 8;
 428                 }
 429         }
 430         if (m3 & SSKE_MB) {
 431                 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT)
 432                         vcpu->run->s.regs.gprs[reg2] &= ~PAGE_MASK;
 433                 else
 434                         vcpu->run->s.regs.gprs[reg2] &= ~0xfffff000UL;
 435                 end = kvm_s390_logical_to_effective(vcpu, end);
 436                 vcpu->run->s.regs.gprs[reg2] |= end;
 437         }
 438         return 0;
 439 }
 440
 441 static int handle_ipte_interlock(struct kvm_vcpu *vcpu)
 442 {
 443         vcpu->stat.instruction_ipte_interlock++;
 444         if (psw_bits(vcpu->arch.sie_block->gpsw).pstate)
 445                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 446         wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu));
 447         kvm_s390_retry_instr(vcpu);
 448         VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation");
 449         return 0;
 450 }
 451
 452 static int handle_test_block(struct kvm_vcpu *vcpu)
 453 {
 454         gpa_t addr;
 455         int reg2;
 456
 457         vcpu->stat.instruction_tb++;
 458
 459         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 460                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 461
 462         kvm_s390_get_regs_rre(vcpu, NULL, &reg2);
 463         addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 464         addr = kvm_s390_logical_to_effective(vcpu, addr);
 465         if (kvm_s390_check_low_addr_prot_real(vcpu, addr))
 466                 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
 467         addr = kvm_s390_real_to_abs(vcpu, addr);
 468
 469         if (kvm_is_error_gpa(vcpu->kvm, addr))
 470                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 471         /*
 472          * We don't expect errors on modern systems, and do not care
 473          * about storage keys (yet), so let's just clear the page.
 474          */
 475         if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE))
 476                 return -EFAULT;
 477         kvm_s390_set_psw_cc(vcpu, 0);
 478         vcpu->run->s.regs.gprs[0] = 0;
 479         return 0;
 480 }
 481
 482 static int handle_tpi(struct kvm_vcpu *vcpu)
 483 {
 484         struct kvm_s390_interrupt_info *inti;
 485         unsigned long len;
 486         u32 tpi_data[3];
 487         int rc;
 488         u64 addr;
 489         u8 ar;
 490
 491         vcpu->stat.instruction_tpi++;
 492
 493         addr = kvm_s390_get_base_disp_s(vcpu, &ar);
 494         if (addr & 3)
 495                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 496
 497         inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0);
 498         if (!inti) {
 499                 kvm_s390_set_psw_cc(vcpu, 0);
 500                 return 0;
 501         }
 502
 503         tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr;
 504         tpi_data[1] = inti->io.io_int_parm;
 505         tpi_data[2] = inti->io.io_int_word;
 506         if (addr) {
 507                 /*
 508                  * Store the two-word I/O interruption code into the
 509                  * provided area.
 510                  */
 511                 len = sizeof(tpi_data) - 4;
 512                 rc = write_guest(vcpu, addr, ar, &tpi_data, len);
 513                 if (rc) {
 514                         rc = kvm_s390_inject_prog_cond(vcpu, rc);
 515                         goto reinject_interrupt;
 516                 }
 517         } else {
 518                 /*
 519                  * Store the three-word I/O interruption code into
 520                  * the appropriate lowcore area.
 521                  */
 522                 len = sizeof(tpi_data);
 523                 if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) {
 524                         /* failed writes to the low core are not recoverable */
 525                         rc = -EFAULT;
 526                         goto reinject_interrupt;
 527                 }
 528         }
 529
 530         /* irq was successfully handed to the guest */
 531         kfree(inti);
 532         kvm_s390_set_psw_cc(vcpu, 1);
 533         return 0;
 534 reinject_interrupt:
 535         /*
 536          * If we encounter a problem storing the interruption code, the
 537          * instruction is suppressed from the guest's view: reinject the
 538          * interrupt.
 539          */
 540         if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) {
 541                 kfree(inti);
 542                 rc = -EFAULT;
 543         }
 544         /* don't set the cc, a pgm irq was injected or we drop to user space */
 545         return rc ? -EFAULT : 0;
 546 }
 547
 548 static int handle_tsch(struct kvm_vcpu *vcpu)
 549 {
 550         struct kvm_s390_interrupt_info *inti = NULL;
 551         const u64 isc_mask = 0xffUL << 24; /* all iscs set */
 552
 553         vcpu->stat.instruction_tsch++;
 554
 555         /* a valid schid has at least one bit set */
 556         if (vcpu->run->s.regs.gprs[1])
 557                 inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask,
 558                                            vcpu->run->s.regs.gprs[1]);
 559
 560         /*
 561          * Prepare exit to userspace.
 562          * We indicate whether we dequeued a pending I/O interrupt
 563          * so that userspace can re-inject it if the instruction gets
 564          * a program check. While this may re-order the pending I/O
 565          * interrupts, this is no problem since the priority is kept
 566          * intact.
 567          */
 568         vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
 569         vcpu->run->s390_tsch.dequeued = !!inti;
 570         if (inti) {
 571                 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
 572                 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
 573                 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
 574                 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
 575         }
 576         vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
 577         kfree(inti);
 578         return -EREMOTE;
 579 }
 580
 581 static int handle_io_inst(struct kvm_vcpu *vcpu)
 582 {
 583         VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
 584
 585         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 586                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 587
 588         if (vcpu->kvm->arch.css_support) {
 589                 /*
 590                  * Most I/O instructions will be handled by userspace.
 591                  * Exceptions are tpi and the interrupt portion of tsch.
 592                  */
 593                 if (vcpu->arch.sie_block->ipa == 0xb236)
 594                         return handle_tpi(vcpu);
 595                 if (vcpu->arch.sie_block->ipa == 0xb235)
 596                         return handle_tsch(vcpu);
 597                 /* Handle in userspace. */
 598                 vcpu->stat.instruction_io_other++;
 599                 return -EOPNOTSUPP;
 600         } else {
 601                 /*
 602                  * Set condition code 3 to stop the guest from issuing channel
 603                  * I/O instructions.
 604                  */
 605                 kvm_s390_set_psw_cc(vcpu, 3);
 606                 return 0;
 607         }
 608 }
 609
 610 /*
 611  * handle_pqap: Handling pqap interception
 612  * @vcpu: the vcpu having issue the pqap instruction
 613  *
 614  * We now support PQAP/AQIC instructions and we need to correctly
 615  * answer the guest even if no dedicated driver's hook is available.
 616  *
 617  * The intercepting code calls a dedicated callback for this instruction
 618  * if a driver did register one in the CRYPTO satellite of the
 619  * SIE block.
 620  *
 621  * If no callback is available, the queues are not available, return this
 622  * response code to the caller and set CC to 3.
 623  * Else return the response code returned by the callback.
 624  */
 625 static int handle_pqap(struct kvm_vcpu *vcpu)
 626 {
 627         struct ap_queue_status status = {};
 628         unsigned long reg0;
 629         int ret;
 630         uint8_t fc;
 631
 632         /* Verify that the AP instruction are available */
 633         if (!ap_instructions_available())
 634                 return -EOPNOTSUPP;
 635         /* Verify that the guest is allowed to use AP instructions */
 636         if (!(vcpu->arch.sie_block->eca & ECA_APIE))
 637                 return -EOPNOTSUPP;
 638         /*
 639          * The only possibly intercepted functions when AP instructions are
 640          * available for the guest are AQIC and TAPQ with the t bit set
 641          * since we do not set IC.3 (FIII) we currently will only intercept
 642          * the AQIC function code.
 643          * Note: running nested under z/VM can result in intercepts for other
 644          * function codes, e.g. PQAP(QCI). We do not support this and bail out.
 645          */
 646         reg0 = vcpu->run->s.regs.gprs[0];
 647         fc = (reg0 >> 24) & 0xff;
 648         if (fc != 0x03)
 649                 return -EOPNOTSUPP;
 650
 651         /* PQAP instruction is allowed for guest kernel only */
 652         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 653                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 654
 655         /* Common PQAP instruction specification exceptions */
 656         /* bits 41-47 must all be zeros */
 657         if (reg0 & 0x007f0000UL)
 658                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 659         /* APFT not install and T bit set */
 660         if (!test_kvm_facility(vcpu->kvm, 15) && (reg0 & 0x00800000UL))
 661                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 662         /* APXA not installed and APID greater 64 or APQI greater 16 */
 663         if (!(vcpu->kvm->arch.crypto.crycbd & 0x02) && (reg0 & 0x0000c0f0UL))
 664                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 665
 666         /* AQIC function code specific exception */
 667         /* facility 65 not present for AQIC function code */
 668         if (!test_kvm_facility(vcpu->kvm, 65))
 669                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 670
 671         /*
 672          * Verify that the hook callback is registered, lock the owner
 673          * and call the hook.
 674          */
 675         if (vcpu->kvm->arch.crypto.pqap_hook) {
 676                 if (!try_module_get(vcpu->kvm->arch.crypto.pqap_hook->owner))
 677                         return -EOPNOTSUPP;
 678                 ret = vcpu->kvm->arch.crypto.pqap_hook->hook(vcpu);
 679                 module_put(vcpu->kvm->arch.crypto.pqap_hook->owner);
 680                 if (!ret && vcpu->run->s.regs.gprs[1] & 0x00ff0000)
 681                         kvm_s390_set_psw_cc(vcpu, 3);
 682                 return ret;
 683         }
 684         /*
 685          * A vfio_driver must register a hook.
 686          * No hook means no driver to enable the SIE CRYCB and no queues.
 687          * We send this response to the guest.
 688          */
 689         status.response_code = 0x01;
 690         memcpy(&vcpu->run->s.regs.gprs[1], &status, sizeof(status));
 691         kvm_s390_set_psw_cc(vcpu, 3);
 692         return 0;
 693 }
 694
 695 static int handle_stfl(struct kvm_vcpu *vcpu)
 696 {
 697         int rc;
 698         unsigned int fac;
 699
 700         vcpu->stat.instruction_stfl++;
 701
 702         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 703                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 704
 705         /*
 706          * We need to shift the lower 32 facility bits (bit 0-31) from a u64
 707          * into a u32 memory representation. They will remain bits 0-31.
 708          */
 709         fac = *vcpu->kvm->arch.model.fac_list >> 32;
 710         rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list),
 711                             &fac, sizeof(fac));
 712         if (rc)
 713                 return rc;
 714         VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac);
 715         trace_kvm_s390_handle_stfl(vcpu, fac);
 716         return 0;
 717 }
 718
 719 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
 720 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
 721 #define PSW_ADDR_24 0x0000000000ffffffUL
 722 #define PSW_ADDR_31 0x000000007fffffffUL
 723
 724 int is_valid_psw(psw_t *psw)
 725 {
 726         if (psw->mask & PSW_MASK_UNASSIGNED)
 727                 return 0;
 728         if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
 729                 if (psw->addr & ~PSW_ADDR_31)
 730                         return 0;
 731         }
 732         if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
 733                 return 0;
 734         if ((psw->mask & PSW_MASK_ADDR_MODE) ==  PSW_MASK_EA)
 735                 return 0;
 736         if (psw->addr & 1)
 737                 return 0;
 738         return 1;
 739 }
 740
 741 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
 742 {
 743         psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
 744         psw_compat_t new_psw;
 745         u64 addr;
 746         int rc;
 747         u8 ar;
 748
 749         vcpu->stat.instruction_lpsw++;
 750
 751         if (gpsw->mask & PSW_MASK_PSTATE)
 752                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 753
 754         addr = kvm_s390_get_base_disp_s(vcpu, &ar);
 755         if (addr & 7)
 756                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 757
 758         rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
 759         if (rc)
 760                 return kvm_s390_inject_prog_cond(vcpu, rc);
 761         if (!(new_psw.mask & PSW32_MASK_BASE))
 762                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 763         gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
 764         gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
 765         gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
 766         if (!is_valid_psw(gpsw))
 767                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 768         return 0;
 769 }
 770
 771 static int handle_lpswe(struct kvm_vcpu *vcpu)
 772 {
 773         psw_t new_psw;
 774         u64 addr;
 775         int rc;
 776         u8 ar;
 777
 778         vcpu->stat.instruction_lpswe++;
 779
 780         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 781                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 782
 783         addr = kvm_s390_get_base_disp_s(vcpu, &ar);
 784         if (addr & 7)
 785                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 786         rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
 787         if (rc)
 788                 return kvm_s390_inject_prog_cond(vcpu, rc);
 789         vcpu->arch.sie_block->gpsw = new_psw;
 790         if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
 791                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 792         return 0;
 793 }
 794
 795 static int handle_stidp(struct kvm_vcpu *vcpu)
 796 {
 797         u64 stidp_data = vcpu->kvm->arch.model.cpuid;
 798         u64 operand2;
 799         int rc;
 800         u8 ar;
 801
 802         vcpu->stat.instruction_stidp++;
 803
 804         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 805                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 806
 807         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 808
 809         if (operand2 & 7)
 810                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 811
 812         rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data));
 813         if (rc)
 814                 return kvm_s390_inject_prog_cond(vcpu, rc);
 815
 816         VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data);
 817         return 0;
 818 }
 819
 820 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
 821 {
 822         int cpus = 0;
 823         int n;
 824
 825         cpus = atomic_read(&vcpu->kvm->online_vcpus);
 826
 827         /* deal with other level 3 hypervisors */
 828         if (stsi(mem, 3, 2, 2))
 829                 mem->count = 0;
 830         if (mem->count < 8)
 831                 mem->count++;
 832         for (n = mem->count - 1; n > 0 ; n--)
 833                 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
 834
 835         memset(&mem->vm[0], 0, sizeof(mem->vm[0]));
 836         mem->vm[0].cpus_total = cpus;
 837         mem->vm[0].cpus_configured = cpus;
 838         mem->vm[0].cpus_standby = 0;
 839         mem->vm[0].cpus_reserved = 0;
 840         mem->vm[0].caf = 1000;
 841         memcpy(mem->vm[0].name, "KVMguest", 8);
 842         ASCEBC(mem->vm[0].name, 8);
 843         memcpy(mem->vm[0].cpi, "KVM/Linux       ", 16);
 844         ASCEBC(mem->vm[0].cpi, 16);
 845 }
 846
 847 static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, u8 ar,
 848                                  u8 fc, u8 sel1, u16 sel2)
 849 {
 850         vcpu->run->exit_reason = KVM_EXIT_S390_STSI;
 851         vcpu->run->s390_stsi.addr = addr;
 852         vcpu->run->s390_stsi.ar = ar;
 853         vcpu->run->s390_stsi.fc = fc;
 854         vcpu->run->s390_stsi.sel1 = sel1;
 855         vcpu->run->s390_stsi.sel2 = sel2;
 856 }
 857
 858 static int handle_stsi(struct kvm_vcpu *vcpu)
 859 {
 860         int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
 861         int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
 862         int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
 863         unsigned long mem = 0;
 864         u64 operand2;
 865         int rc = 0;
 866         u8 ar;
 867
 868         vcpu->stat.instruction_stsi++;
 869         VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2);
 870
 871         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 872                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 873
 874         if (fc > 3) {
 875                 kvm_s390_set_psw_cc(vcpu, 3);
 876                 return 0;
 877         }
 878
 879         if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
 880             || vcpu->run->s.regs.gprs[1] & 0xffff0000)
 881                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 882
 883         if (fc == 0) {
 884                 vcpu->run->s.regs.gprs[0] = 3 << 28;
 885                 kvm_s390_set_psw_cc(vcpu, 0);
 886                 return 0;
 887         }
 888
 889         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 890
 891         if (!kvm_s390_pv_cpu_is_protected(vcpu) && (operand2 & 0xfff))
 892                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 893
 894         switch (fc) {
 895         case 1: /* same handling for 1 and 2 */
 896         case 2:
 897                 mem = get_zeroed_page(GFP_KERNEL);
 898                 if (!mem)
 899                         goto out_no_data;
 900                 if (stsi((void *) mem, fc, sel1, sel2))
 901                         goto out_no_data;
 902                 break;
 903         case 3:
 904                 if (sel1 != 2 || sel2 != 2)
 905                         goto out_no_data;
 906                 mem = get_zeroed_page(GFP_KERNEL);
 907                 if (!mem)
 908                         goto out_no_data;
 909                 handle_stsi_3_2_2(vcpu, (void *) mem);
 910                 break;
 911         }
 912         if (kvm_s390_pv_cpu_is_protected(vcpu)) {
 913                 memcpy((void *)sida_origin(vcpu->arch.sie_block), (void *)mem,
 914                        PAGE_SIZE);
 915                 rc = 0;
 916         } else {
 917                 rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE);
 918         }
 919         if (rc) {
 920                 rc = kvm_s390_inject_prog_cond(vcpu, rc);
 921                 goto out;
 922         }
 923         if (vcpu->kvm->arch.user_stsi) {
 924                 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
 925                 rc = -EREMOTE;
 926         }
 927         trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
 928         free_page(mem);
 929         kvm_s390_set_psw_cc(vcpu, 0);
 930         vcpu->run->s.regs.gprs[0] = 0;
 931         return rc;
 932 out_no_data:
 933         kvm_s390_set_psw_cc(vcpu, 3);
 934 out:
 935         free_page(mem);
 936         return rc;
 937 }
 938
 939 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
 940 {
 941         switch (vcpu->arch.sie_block->ipa & 0x00ff) {
 942         case 0x02:
 943                 return handle_stidp(vcpu);
 944         case 0x04:
 945                 return handle_set_clock(vcpu);
 946         case 0x10:
 947                 return handle_set_prefix(vcpu);
 948         case 0x11:
 949                 return handle_store_prefix(vcpu);
 950         case 0x12:
 951                 return handle_store_cpu_address(vcpu);
 952         case 0x14:
 953                 return kvm_s390_handle_vsie(vcpu);
 954         case 0x21:
 955         case 0x50:
 956                 return handle_ipte_interlock(vcpu);
 957         case 0x29:
 958                 return handle_iske(vcpu);
 959         case 0x2a:
 960                 return handle_rrbe(vcpu);
 961         case 0x2b:
 962                 return handle_sske(vcpu);
 963         case 0x2c:
 964                 return handle_test_block(vcpu);
 965         case 0x30:
 966         case 0x31:
 967         case 0x32:
 968         case 0x33:
 969         case 0x34:
 970         case 0x35:
 971         case 0x36:
 972         case 0x37:
 973         case 0x38:
 974         case 0x39:
 975         case 0x3a:
 976         case 0x3b:
 977         case 0x3c:
 978         case 0x5f:
 979         case 0x74:
 980         case 0x76:
 981                 return handle_io_inst(vcpu);
 982         case 0x56:
 983                 return handle_sthyi(vcpu);
 984         case 0x7d:
 985                 return handle_stsi(vcpu);
 986         case 0xaf:
 987                 return handle_pqap(vcpu);
 988         case 0xb1:
 989                 return handle_stfl(vcpu);
 990         case 0xb2:
 991                 return handle_lpswe(vcpu);
 992         default:
 993                 return -EOPNOTSUPP;
 994         }
 995 }
 996
 997 static int handle_epsw(struct kvm_vcpu *vcpu)
 998 {
 999         int reg1, reg2;
1000
1001         vcpu->stat.instruction_epsw++;
1002
1003         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
1004
1005         /* This basically extracts the mask half of the psw. */
1006         vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
1007         vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
1008         if (reg2) {
1009                 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
1010                 vcpu->run->s.regs.gprs[reg2] |=
1011                         vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
1012         }
1013         return 0;
1014 }
1015
1016 #define PFMF_RESERVED   0xfffc0101UL
1017 #define PFMF_SK         0x00020000UL
1018 #define PFMF_CF         0x00010000UL
1019 #define PFMF_UI         0x00008000UL
1020 #define PFMF_FSC        0x00007000UL
1021 #define PFMF_NQ         0x00000800UL
1022 #define PFMF_MR         0x00000400UL
1023 #define PFMF_MC         0x00000200UL
1024 #define PFMF_KEY        0x000000feUL
1025
1026 static int handle_pfmf(struct kvm_vcpu *vcpu)
1027 {
1028         bool mr = false, mc = false, nq;
1029         int reg1, reg2;
1030         unsigned long start, end;
1031         unsigned char key;
1032
1033         vcpu->stat.instruction_pfmf++;
1034
1035         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
1036
1037         if (!test_kvm_facility(vcpu->kvm, 8))
1038                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1039
1040         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1041                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1042
1043         if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
1044                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1045
1046         /* Only provide non-quiescing support if enabled for the guest */
1047         if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ &&
1048             !test_kvm_facility(vcpu->kvm, 14))
1049                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1050
1051         /* Only provide conditional-SSKE support if enabled for the guest */
1052         if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK &&
1053             test_kvm_facility(vcpu->kvm, 10)) {
1054                 mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR;
1055                 mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC;
1056         }
1057
1058         nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ;
1059         key = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY;
1060         start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
1061         start = kvm_s390_logical_to_effective(vcpu, start);
1062
1063         if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
1064                 if (kvm_s390_check_low_addr_prot_real(vcpu, start))
1065                         return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
1066         }
1067
1068         switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
1069         case 0x00000000:
1070                 /* only 4k frames specify a real address */
1071                 start = kvm_s390_real_to_abs(vcpu, start);
1072                 end = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1);
1073                 break;
1074         case 0x00001000:
1075                 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
1076                 break;
1077         case 0x00002000:
1078                 /* only support 2G frame size if EDAT2 is available and we are
1079                    not in 24-bit addressing mode */
1080                 if (!test_kvm_facility(vcpu->kvm, 78) ||
1081                     psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_24BIT)
1082                         return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1083                 end = (start + _REGION3_SIZE) & ~(_REGION3_SIZE - 1);
1084                 break;
1085         default:
1086                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1087         }
1088
1089         while (start != end) {
1090                 unsigned long vmaddr;
1091                 bool unlocked = false;
1092
1093                 /* Translate guest address to host address */
1094                 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
1095                 if (kvm_is_error_hva(vmaddr))
1096                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1097
1098                 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
1099                         if (kvm_clear_guest(vcpu->kvm, start, PAGE_SIZE))
1100                                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1101                 }
1102
1103                 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
1104                         int rc = kvm_s390_skey_check_enable(vcpu);
1105
1106                         if (rc)
1107                                 return rc;
1108                         mmap_read_lock(current->mm);
1109                         rc = cond_set_guest_storage_key(current->mm, vmaddr,
1110                                                         key, NULL, nq, mr, mc);
1111                         if (rc < 0) {
1112                                 rc = fixup_user_fault(current->mm, vmaddr,
1113                                                       FAULT_FLAG_WRITE, &unlocked);
1114                                 rc = !rc ? -EAGAIN : rc;
1115                         }
1116                         mmap_read_unlock(current->mm);
1117                         if (rc == -EFAULT)
1118                                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1119                         if (rc == -EAGAIN)
1120                                 continue;
1121                         if (rc < 0)
1122                                 return rc;
1123                 }
1124                 start += PAGE_SIZE;
1125         }
1126         if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
1127                 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) {
1128                         vcpu->run->s.regs.gprs[reg2] = end;
1129                 } else {
1130                         vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL;
1131                         end = kvm_s390_logical_to_effective(vcpu, end);
1132                         vcpu->run->s.regs.gprs[reg2] |= end;
1133                 }
1134         }
1135         return 0;
1136 }
1137
1138 /*
1139  * Must be called with relevant read locks held (kvm->mm->mmap_lock, kvm->srcu)
1140  */
1141 static inline int __do_essa(struct kvm_vcpu *vcpu, const int orc)
1142 {
1143         int r1, r2, nappended, entries;
1144         unsigned long gfn, hva, res, pgstev, ptev;
1145         unsigned long *cbrlo;
1146
1147         /*
1148          * We don't need to set SD.FPF.SK to 1 here, because if we have a
1149          * machine check here we either handle it or crash
1150          */
1151
1152         kvm_s390_get_regs_rre(vcpu, &r1, &r2);
1153         gfn = vcpu->run->s.regs.gprs[r2] >> PAGE_SHIFT;
1154         hva = gfn_to_hva(vcpu->kvm, gfn);
1155         entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1156
1157         if (kvm_is_error_hva(hva))
1158                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1159
1160         nappended = pgste_perform_essa(vcpu->kvm->mm, hva, orc, &ptev, &pgstev);
1161         if (nappended < 0) {
1162                 res = orc ? 0x10 : 0;
1163                 vcpu->run->s.regs.gprs[r1] = res; /* Exception Indication */
1164                 return 0;
1165         }
1166         res = (pgstev & _PGSTE_GPS_USAGE_MASK) >> 22;
1167         /*
1168          * Set the block-content state part of the result. 0 means resident, so
1169          * nothing to do if the page is valid. 2 is for preserved pages
1170          * (non-present and non-zero), and 3 for zero pages (non-present and
1171          * zero).
1172          */
1173         if (ptev & _PAGE_INVALID) {
1174                 res |= 2;
1175                 if (pgstev & _PGSTE_GPS_ZERO)
1176                         res |= 1;
1177         }
1178         if (pgstev & _PGSTE_GPS_NODAT)
1179                 res |= 0x20;
1180         vcpu->run->s.regs.gprs[r1] = res;
1181         /*
1182          * It is possible that all the normal 511 slots were full, in which case
1183          * we will now write in the 512th slot, which is reserved for host use.
1184          * In both cases we let the normal essa handling code process all the
1185          * slots, including the reserved one, if needed.
1186          */
1187         if (nappended > 0) {
1188                 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo & PAGE_MASK);
1189                 cbrlo[entries] = gfn << PAGE_SHIFT;
1190         }
1191
1192         if (orc) {
1193                 struct kvm_memory_slot *ms = gfn_to_memslot(vcpu->kvm, gfn);
1194
1195                 /* Increment only if we are really flipping the bit */
1196                 if (ms && !test_and_set_bit(gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms)))
1197                         atomic64_inc(&vcpu->kvm->arch.cmma_dirty_pages);
1198         }
1199
1200         return nappended;
1201 }
1202
1203 static int handle_essa(struct kvm_vcpu *vcpu)
1204 {
1205         /* entries expected to be 1FF */
1206         int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1207         unsigned long *cbrlo;
1208         struct gmap *gmap;
1209         int i, orc;
1210
1211         VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries);
1212         gmap = vcpu->arch.gmap;
1213         vcpu->stat.instruction_essa++;
1214         if (!vcpu->kvm->arch.use_cmma)
1215                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1216
1217         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1218                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1219         /* Check for invalid operation request code */
1220         orc = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
1221         /* ORCs 0-6 are always valid */
1222         if (orc > (test_kvm_facility(vcpu->kvm, 147) ? ESSA_SET_STABLE_NODAT
1223                                                 : ESSA_SET_STABLE_IF_RESIDENT))
1224                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1225
1226         if (!vcpu->kvm->arch.migration_mode) {
1227                 /*
1228                  * CMMA is enabled in the KVM settings, but is disabled in
1229                  * the SIE block and in the mm_context, and we are not doing
1230                  * a migration. Enable CMMA in the mm_context.
1231                  * Since we need to take a write lock to write to the context
1232                  * to avoid races with storage keys handling, we check if the
1233                  * value really needs to be written to; if the value is
1234                  * already correct, we do nothing and avoid the lock.
1235                  */
1236                 if (vcpu->kvm->mm->context.uses_cmm == 0) {
1237                         mmap_write_lock(vcpu->kvm->mm);
1238                         vcpu->kvm->mm->context.uses_cmm = 1;
1239                         mmap_write_unlock(vcpu->kvm->mm);
1240                 }
1241                 /*
1242                  * If we are here, we are supposed to have CMMA enabled in
1243                  * the SIE block. Enabling CMMA works on a per-CPU basis,
1244                  * while the context use_cmma flag is per process.
1245                  * It's possible that the context flag is enabled and the
1246                  * SIE flag is not, so we set the flag always; if it was
1247                  * already set, nothing changes, otherwise we enable it
1248                  * on this CPU too.
1249                  */
1250                 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
1251                 /* Retry the ESSA instruction */
1252                 kvm_s390_retry_instr(vcpu);
1253         } else {
1254                 int srcu_idx;
1255
1256                 mmap_read_lock(vcpu->kvm->mm);
1257                 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
1258                 i = __do_essa(vcpu, orc);
1259                 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
1260                 mmap_read_unlock(vcpu->kvm->mm);
1261                 if (i < 0)
1262                         return i;
1263                 /* Account for the possible extra cbrl entry */
1264                 entries += i;
1265         }
1266         vcpu->arch.sie_block->cbrlo &= PAGE_MASK;       /* reset nceo */
1267         cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
1268         mmap_read_lock(gmap->mm);
1269         for (i = 0; i < entries; ++i)
1270                 __gmap_zap(gmap, cbrlo[i]);
1271         mmap_read_unlock(gmap->mm);
1272         return 0;
1273 }
1274
1275 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
1276 {
1277         switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1278         case 0x8a:
1279         case 0x8e:
1280         case 0x8f:
1281                 return handle_ipte_interlock(vcpu);
1282         case 0x8d:
1283                 return handle_epsw(vcpu);
1284         case 0xab:
1285                 return handle_essa(vcpu);
1286         case 0xaf:
1287                 return handle_pfmf(vcpu);
1288         default:
1289                 return -EOPNOTSUPP;
1290         }
1291 }
1292
1293 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
1294 {
1295         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1296         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1297         int reg, rc, nr_regs;
1298         u32 ctl_array[16];
1299         u64 ga;
1300         u8 ar;
1301
1302         vcpu->stat.instruction_lctl++;
1303
1304         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1305                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1306
1307         ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1308
1309         if (ga & 3)
1310                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1311
1312         VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1313         trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga);
1314
1315         nr_regs = ((reg3 - reg1) & 0xf) + 1;
1316         rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1317         if (rc)
1318                 return kvm_s390_inject_prog_cond(vcpu, rc);
1319         reg = reg1;
1320         nr_regs = 0;
1321         do {
1322                 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
1323                 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++];
1324                 if (reg == reg3)
1325                         break;
1326                 reg = (reg + 1) % 16;
1327         } while (1);
1328         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1329         return 0;
1330 }
1331
1332 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu)
1333 {
1334         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1335         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1336         int reg, rc, nr_regs;
1337         u32 ctl_array[16];
1338         u64 ga;
1339         u8 ar;
1340
1341         vcpu->stat.instruction_stctl++;
1342
1343         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1344                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1345
1346         ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1347
1348         if (ga & 3)
1349                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1350
1351         VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1352         trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga);
1353
1354         reg = reg1;
1355         nr_regs = 0;
1356         do {
1357                 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1358                 if (reg == reg3)
1359                         break;
1360                 reg = (reg + 1) % 16;
1361         } while (1);
1362         rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1363         return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1364 }
1365
1366 static int handle_lctlg(struct kvm_vcpu *vcpu)
1367 {
1368         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1369         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1370         int reg, rc, nr_regs;
1371         u64 ctl_array[16];
1372         u64 ga;
1373         u8 ar;
1374
1375         vcpu->stat.instruction_lctlg++;
1376
1377         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1378                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1379
1380         ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1381
1382         if (ga & 7)
1383                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1384
1385         VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1386         trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga);
1387
1388         nr_regs = ((reg3 - reg1) & 0xf) + 1;
1389         rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1390         if (rc)
1391                 return kvm_s390_inject_prog_cond(vcpu, rc);
1392         reg = reg1;
1393         nr_regs = 0;
1394         do {
1395                 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++];
1396                 if (reg == reg3)
1397                         break;
1398                 reg = (reg + 1) % 16;
1399         } while (1);
1400         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1401         return 0;
1402 }
1403
1404 static int handle_stctg(struct kvm_vcpu *vcpu)
1405 {
1406         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1407         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1408         int reg, rc, nr_regs;
1409         u64 ctl_array[16];
1410         u64 ga;
1411         u8 ar;
1412
1413         vcpu->stat.instruction_stctg++;
1414
1415         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1416                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1417
1418         ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1419
1420         if (ga & 7)
1421                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1422
1423         VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1424         trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga);
1425
1426         reg = reg1;
1427         nr_regs = 0;
1428         do {
1429                 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1430                 if (reg == reg3)
1431                         break;
1432                 reg = (reg + 1) % 16;
1433         } while (1);
1434         rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1435         return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1436 }
1437
1438 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
1439 {
1440         switch (vcpu->arch.sie_block->ipb & 0x000000ff) {
1441         case 0x25:
1442                 return handle_stctg(vcpu);
1443         case 0x2f:
1444                 return handle_lctlg(vcpu);
1445         case 0x60:
1446         case 0x61:
1447         case 0x62:
1448                 return handle_ri(vcpu);
1449         default:
1450                 return -EOPNOTSUPP;
1451         }
1452 }
1453
1454 static int handle_tprot(struct kvm_vcpu *vcpu)
1455 {
1456         u64 address1, address2;
1457         unsigned long hva, gpa;
1458         int ret = 0, cc = 0;
1459         bool writable;
1460         u8 ar;
1461
1462         vcpu->stat.instruction_tprot++;
1463
1464         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1465                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1466
1467         kvm_s390_get_base_disp_sse(vcpu, &address1, &address2, &ar, NULL);
1468
1469         /* we only handle the Linux memory detection case:
1470          * access key == 0
1471          * everything else goes to userspace. */
1472         if (address2 & 0xf0)
1473                 return -EOPNOTSUPP;
1474         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1475                 ipte_lock(vcpu);
1476         ret = guest_translate_address(vcpu, address1, ar, &gpa, GACC_STORE);
1477         if (ret == PGM_PROTECTION) {
1478                 /* Write protected? Try again with read-only... */
1479                 cc = 1;
1480                 ret = guest_translate_address(vcpu, address1, ar, &gpa,
1481                                               GACC_FETCH);
1482         }
1483         if (ret) {
1484                 if (ret == PGM_ADDRESSING || ret == PGM_TRANSLATION_SPEC) {
1485                         ret = kvm_s390_inject_program_int(vcpu, ret);
1486                 } else if (ret > 0) {
1487                         /* Translation not available */
1488                         kvm_s390_set_psw_cc(vcpu, 3);
1489                         ret = 0;
1490                 }
1491                 goto out_unlock;
1492         }
1493
1494         hva = gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable);
1495         if (kvm_is_error_hva(hva)) {
1496                 ret = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1497         } else {
1498                 if (!writable)
1499                         cc = 1;         /* Write not permitted ==> read-only */
1500                 kvm_s390_set_psw_cc(vcpu, cc);
1501                 /* Note: CC2 only occurs for storage keys (not supported yet) */
1502         }
1503 out_unlock:
1504         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1505                 ipte_unlock(vcpu);
1506         return ret;
1507 }
1508
1509 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
1510 {
1511         switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1512         case 0x01:
1513                 return handle_tprot(vcpu);
1514         default:
1515                 return -EOPNOTSUPP;
1516         }
1517 }
1518
1519 static int handle_sckpf(struct kvm_vcpu *vcpu)
1520 {
1521         u32 value;
1522
1523         vcpu->stat.instruction_sckpf++;
1524
1525         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1526                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1527
1528         if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
1529                 return kvm_s390_inject_program_int(vcpu,
1530                                                    PGM_SPECIFICATION);
1531
1532         value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
1533         vcpu->arch.sie_block->todpr = value;
1534
1535         return 0;
1536 }
1537
1538 static int handle_ptff(struct kvm_vcpu *vcpu)
1539 {
1540         vcpu->stat.instruction_ptff++;
1541
1542         /* we don't emulate any control instructions yet */
1543         kvm_s390_set_psw_cc(vcpu, 3);
1544         return 0;
1545 }
1546
1547 int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
1548 {
1549         switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1550         case 0x04:
1551                 return handle_ptff(vcpu);
1552         case 0x07:
1553                 return handle_sckpf(vcpu);
1554         default:
1555                 return -EOPNOTSUPP;
1556         }
1557 }