arch/s390/kvm/priv.c

   1 /*
   2  * handling privileged instructions
   3  *
   4  * Copyright IBM Corp. 2008, 2013
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License (version 2 only)
   8  * as published by the Free Software Foundation.
   9  *
  10  *    Author(s): Carsten Otte <cotte@de.ibm.com>
  11  *               Christian Borntraeger <borntraeger@de.ibm.com>
  12  */
  13
  14 #include <linux/kvm.h>
  15 #include <linux/gfp.h>
  16 #include <linux/errno.h>
  17 #include <linux/compat.h>
  18 #include <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/pgtable.h>
  25 #include <asm/pgalloc.h>
  26 #include <asm/io.h>
  27 #include <asm/ptrace.h>
  28 #include <asm/compat.h>
  29 #include "gaccess.h"
  30 #include "kvm-s390.h"
  31 #include "trace.h"
  32
  33 static int handle_set_prefix(struct kvm_vcpu *vcpu)
  34 {
  35         u64 operand2;
  36         u32 address = 0;
  37         u8 tmp;
  38
  39         vcpu->stat.instruction_spx++;
  40
  41         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
  42                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
  43
  44         operand2 = kvm_s390_get_base_disp_s(vcpu);
  45
  46         /* must be word boundary */
  47         if (operand2 & 3)
  48                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
  49
  50         /* get the value */
  51         if (get_guest(vcpu, address, (u32 __user *) operand2))
  52                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
  53
  54         address = address & 0x7fffe000u;
  55
  56         /* make sure that the new value is valid memory */
  57         if (copy_from_guest_absolute(vcpu, &tmp, address, 1) ||
  58            (copy_from_guest_absolute(vcpu, &tmp, address + PAGE_SIZE, 1)))
  59                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
  60
  61         kvm_s390_set_prefix(vcpu, address);
  62
  63         VCPU_EVENT(vcpu, 5, "setting prefix to %x", address);
  64         trace_kvm_s390_handle_prefix(vcpu, 1, address);
  65         return 0;
  66 }
  67
  68 static int handle_store_prefix(struct kvm_vcpu *vcpu)
  69 {
  70         u64 operand2;
  71         u32 address;
  72
  73         vcpu->stat.instruction_stpx++;
  74
  75         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
  76                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
  77
  78         operand2 = kvm_s390_get_base_disp_s(vcpu);
  79
  80         /* must be word boundary */
  81         if (operand2 & 3)
  82                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
  83
  84         address = vcpu->arch.sie_block->prefix;
  85         address = address & 0x7fffe000u;
  86
  87         /* get the value */
  88         if (put_guest(vcpu, address, (u32 __user *)operand2))
  89                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
  90
  91         VCPU_EVENT(vcpu, 5, "storing prefix to %x", address);
  92         trace_kvm_s390_handle_prefix(vcpu, 0, address);
  93         return 0;
  94 }
  95
  96 static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
  97 {
  98         u64 useraddr;
  99
 100         vcpu->stat.instruction_stap++;
 101
 102         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 103                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 104
 105         useraddr = kvm_s390_get_base_disp_s(vcpu);
 106
 107         if (useraddr & 1)
 108                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 109
 110         if (put_guest(vcpu, vcpu->vcpu_id, (u16 __user *)useraddr))
 111                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 112
 113         VCPU_EVENT(vcpu, 5, "storing cpu address to %llx", useraddr);
 114         trace_kvm_s390_handle_stap(vcpu, useraddr);
 115         return 0;
 116 }
 117
 118 static int handle_skey(struct kvm_vcpu *vcpu)
 119 {
 120         vcpu->stat.instruction_storage_key++;
 121
 122         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 123                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 124
 125         vcpu->arch.sie_block->gpsw.addr =
 126                 __rewind_psw(vcpu->arch.sie_block->gpsw, 4);
 127         VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
 128         return 0;
 129 }
 130
 131 static int handle_tpi(struct kvm_vcpu *vcpu)
 132 {
 133         struct kvm_s390_interrupt_info *inti;
 134         u64 addr;
 135         int cc;
 136
 137         addr = kvm_s390_get_base_disp_s(vcpu);
 138         if (addr & 3)
 139                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 140         cc = 0;
 141         inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->run->s.regs.crs[6], 0);
 142         if (!inti)
 143                 goto no_interrupt;
 144         cc = 1;
 145         if (addr) {
 146                 /*
 147                  * Store the two-word I/O interruption code into the
 148                  * provided area.
 149                  */
 150                 if (put_guest(vcpu, inti->io.subchannel_id, (u16 __user *)addr)
 151                     || put_guest(vcpu, inti->io.subchannel_nr, (u16 __user *)(addr + 2))
 152                     || put_guest(vcpu, inti->io.io_int_parm, (u32 __user *)(addr + 4)))
 153                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 154         } else {
 155                 /*
 156                  * Store the three-word I/O interruption code into
 157                  * the appropriate lowcore area.
 158                  */
 159                 put_guest(vcpu, inti->io.subchannel_id, (u16 __user *) __LC_SUBCHANNEL_ID);
 160                 put_guest(vcpu, inti->io.subchannel_nr, (u16 __user *) __LC_SUBCHANNEL_NR);
 161                 put_guest(vcpu, inti->io.io_int_parm, (u32 __user *) __LC_IO_INT_PARM);
 162                 put_guest(vcpu, inti->io.io_int_word, (u32 __user *) __LC_IO_INT_WORD);
 163         }
 164         kfree(inti);
 165 no_interrupt:
 166         /* Set condition code and we're done. */
 167         vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
 168         vcpu->arch.sie_block->gpsw.mask |= (cc & 3ul) << 44;
 169         return 0;
 170 }
 171
 172 static int handle_tsch(struct kvm_vcpu *vcpu)
 173 {
 174         struct kvm_s390_interrupt_info *inti;
 175
 176         inti = kvm_s390_get_io_int(vcpu->kvm, 0,
 177                                    vcpu->run->s.regs.gprs[1]);
 178
 179         /*
 180          * Prepare exit to userspace.
 181          * We indicate whether we dequeued a pending I/O interrupt
 182          * so that userspace can re-inject it if the instruction gets
 183          * a program check. While this may re-order the pending I/O
 184          * interrupts, this is no problem since the priority is kept
 185          * intact.
 186          */
 187         vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
 188         vcpu->run->s390_tsch.dequeued = !!inti;
 189         if (inti) {
 190                 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
 191                 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
 192                 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
 193                 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
 194         }
 195         vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
 196         kfree(inti);
 197         return -EREMOTE;
 198 }
 199
 200 static int handle_io_inst(struct kvm_vcpu *vcpu)
 201 {
 202         VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
 203
 204         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 205                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 206
 207         if (vcpu->kvm->arch.css_support) {
 208                 /*
 209                  * Most I/O instructions will be handled by userspace.
 210                  * Exceptions are tpi and the interrupt portion of tsch.
 211                  */
 212                 if (vcpu->arch.sie_block->ipa == 0xb236)
 213                         return handle_tpi(vcpu);
 214                 if (vcpu->arch.sie_block->ipa == 0xb235)
 215                         return handle_tsch(vcpu);
 216                 /* Handle in userspace. */
 217                 return -EOPNOTSUPP;
 218         } else {
 219                 /*
 220                  * Set condition code 3 to stop the guest from issueing channel
 221                  * I/O instructions.
 222                  */
 223                 vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
 224                 vcpu->arch.sie_block->gpsw.mask |= (3 & 3ul) << 44;
 225                 return 0;
 226         }
 227 }
 228
 229 static int handle_stfl(struct kvm_vcpu *vcpu)
 230 {
 231         unsigned int facility_list;
 232         int rc;
 233
 234         vcpu->stat.instruction_stfl++;
 235
 236         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 237                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 238
 239         /* only pass the facility bits, which we can handle */
 240         facility_list = S390_lowcore.stfl_fac_list & 0xff82fff3;
 241
 242         rc = copy_to_guest(vcpu, offsetof(struct _lowcore, stfl_fac_list),
 243                            &facility_list, sizeof(facility_list));
 244         if (rc)
 245                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 246         VCPU_EVENT(vcpu, 5, "store facility list value %x", facility_list);
 247         trace_kvm_s390_handle_stfl(vcpu, facility_list);
 248         return 0;
 249 }
 250
 251 static void handle_new_psw(struct kvm_vcpu *vcpu)
 252 {
 253         /* Check whether the new psw is enabled for machine checks. */
 254         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK)
 255                 kvm_s390_deliver_pending_machine_checks(vcpu);
 256 }
 257
 258 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
 259 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
 260 #define PSW_ADDR_24 0x0000000000ffffffUL
 261 #define PSW_ADDR_31 0x000000007fffffffUL
 262
 263 static int is_valid_psw(psw_t *psw) {
 264         if (psw->mask & PSW_MASK_UNASSIGNED)
 265                 return 0;
 266         if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
 267                 if (psw->addr & ~PSW_ADDR_31)
 268                         return 0;
 269         }
 270         if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
 271                 return 0;
 272         if ((psw->mask & PSW_MASK_ADDR_MODE) ==  PSW_MASK_EA)
 273                 return 0;
 274         return 1;
 275 }
 276
 277 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
 278 {
 279         psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
 280         psw_compat_t new_psw;
 281         u64 addr;
 282
 283         if (gpsw->mask & PSW_MASK_PSTATE)
 284                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 285
 286         addr = kvm_s390_get_base_disp_s(vcpu);
 287         if (addr & 7)
 288                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 289         if (copy_from_guest(vcpu, &new_psw, addr, sizeof(new_psw)))
 290                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 291         if (!(new_psw.mask & PSW32_MASK_BASE))
 292                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 293         gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
 294         gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
 295         gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
 296         if (!is_valid_psw(gpsw))
 297                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 298         handle_new_psw(vcpu);
 299         return 0;
 300 }
 301
 302 static int handle_lpswe(struct kvm_vcpu *vcpu)
 303 {
 304         psw_t new_psw;
 305         u64 addr;
 306
 307         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 308                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 309
 310         addr = kvm_s390_get_base_disp_s(vcpu);
 311         if (addr & 7)
 312                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 313         if (copy_from_guest(vcpu, &new_psw, addr, sizeof(new_psw)))
 314                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 315         vcpu->arch.sie_block->gpsw = new_psw;
 316         if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
 317                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 318         handle_new_psw(vcpu);
 319         return 0;
 320 }
 321
 322 static int handle_stidp(struct kvm_vcpu *vcpu)
 323 {
 324         u64 operand2;
 325
 326         vcpu->stat.instruction_stidp++;
 327
 328         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 329                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 330
 331         operand2 = kvm_s390_get_base_disp_s(vcpu);
 332
 333         if (operand2 & 7)
 334                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 335
 336         if (put_guest(vcpu, vcpu->arch.stidp_data, (u64 __user *)operand2))
 337                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 338
 339         VCPU_EVENT(vcpu, 5, "%s", "store cpu id");
 340         return 0;
 341 }
 342
 343 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
 344 {
 345         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
 346         int cpus = 0;
 347         int n;
 348
 349         spin_lock(&fi->lock);
 350         for (n = 0; n < KVM_MAX_VCPUS; n++)
 351                 if (fi->local_int[n])
 352                         cpus++;
 353         spin_unlock(&fi->lock);
 354
 355         /* deal with other level 3 hypervisors */
 356         if (stsi(mem, 3, 2, 2))
 357                 mem->count = 0;
 358         if (mem->count < 8)
 359                 mem->count++;
 360         for (n = mem->count - 1; n > 0 ; n--)
 361                 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
 362
 363         mem->vm[0].cpus_total = cpus;
 364         mem->vm[0].cpus_configured = cpus;
 365         mem->vm[0].cpus_standby = 0;
 366         mem->vm[0].cpus_reserved = 0;
 367         mem->vm[0].caf = 1000;
 368         memcpy(mem->vm[0].name, "KVMguest", 8);
 369         ASCEBC(mem->vm[0].name, 8);
 370         memcpy(mem->vm[0].cpi, "KVM/Linux       ", 16);
 371         ASCEBC(mem->vm[0].cpi, 16);
 372 }
 373
 374 static int handle_stsi(struct kvm_vcpu *vcpu)
 375 {
 376         int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
 377         int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
 378         int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
 379         unsigned long mem = 0;
 380         u64 operand2;
 381         int rc = 0;
 382
 383         vcpu->stat.instruction_stsi++;
 384         VCPU_EVENT(vcpu, 4, "stsi: fc: %x sel1: %x sel2: %x", fc, sel1, sel2);
 385
 386         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 387                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 388
 389         if (fc > 3) {
 390                 vcpu->arch.sie_block->gpsw.mask |= 3ul << 44;     /* cc 3 */
 391                 return 0;
 392         }
 393
 394         if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
 395             || vcpu->run->s.regs.gprs[1] & 0xffff0000)
 396                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 397
 398         if (fc == 0) {
 399                 vcpu->run->s.regs.gprs[0] = 3 << 28;
 400                 vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);  /* cc 0 */
 401                 return 0;
 402         }
 403
 404         operand2 = kvm_s390_get_base_disp_s(vcpu);
 405
 406         if (operand2 & 0xfff)
 407                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 408
 409         switch (fc) {
 410         case 1: /* same handling for 1 and 2 */
 411         case 2:
 412                 mem = get_zeroed_page(GFP_KERNEL);
 413                 if (!mem)
 414                         goto out_no_data;
 415                 if (stsi((void *) mem, fc, sel1, sel2))
 416                         goto out_no_data;
 417                 break;
 418         case 3:
 419                 if (sel1 != 2 || sel2 != 2)
 420                         goto out_no_data;
 421                 mem = get_zeroed_page(GFP_KERNEL);
 422                 if (!mem)
 423                         goto out_no_data;
 424                 handle_stsi_3_2_2(vcpu, (void *) mem);
 425                 break;
 426         }
 427
 428         if (copy_to_guest_absolute(vcpu, operand2, (void *) mem, PAGE_SIZE)) {
 429                 rc = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 430                 goto out_exception;
 431         }
 432         trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
 433         free_page(mem);
 434         vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
 435         vcpu->run->s.regs.gprs[0] = 0;
 436         return 0;
 437 out_no_data:
 438         /* condition code 3 */
 439         vcpu->arch.sie_block->gpsw.mask |= 3ul << 44;
 440 out_exception:
 441         free_page(mem);
 442         return rc;
 443 }
 444
 445 static const intercept_handler_t b2_handlers[256] = {
 446         [0x02] = handle_stidp,
 447         [0x10] = handle_set_prefix,
 448         [0x11] = handle_store_prefix,
 449         [0x12] = handle_store_cpu_address,
 450         [0x29] = handle_skey,
 451         [0x2a] = handle_skey,
 452         [0x2b] = handle_skey,
 453         [0x30] = handle_io_inst,
 454         [0x31] = handle_io_inst,
 455         [0x32] = handle_io_inst,
 456         [0x33] = handle_io_inst,
 457         [0x34] = handle_io_inst,
 458         [0x35] = handle_io_inst,
 459         [0x36] = handle_io_inst,
 460         [0x37] = handle_io_inst,
 461         [0x38] = handle_io_inst,
 462         [0x39] = handle_io_inst,
 463         [0x3a] = handle_io_inst,
 464         [0x3b] = handle_io_inst,
 465         [0x3c] = handle_io_inst,
 466         [0x5f] = handle_io_inst,
 467         [0x74] = handle_io_inst,
 468         [0x76] = handle_io_inst,
 469         [0x7d] = handle_stsi,
 470         [0xb1] = handle_stfl,
 471         [0xb2] = handle_lpswe,
 472 };
 473
 474 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
 475 {
 476         intercept_handler_t handler;
 477
 478         /*
 479          * A lot of B2 instructions are priviledged. Here we check for
 480          * the privileged ones, that we can handle in the kernel.
 481          * Anything else goes to userspace.
 482          */
 483         handler = b2_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
 484         if (handler)
 485                 return handler(vcpu);
 486
 487         return -EOPNOTSUPP;
 488 }
 489
 490 static int handle_epsw(struct kvm_vcpu *vcpu)
 491 {
 492         int reg1, reg2;
 493
 494         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 495
 496         /* This basically extracts the mask half of the psw. */
 497         vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000;
 498         vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
 499         if (reg2) {
 500                 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000;
 501                 vcpu->run->s.regs.gprs[reg2] |=
 502                         vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffff;
 503         }
 504         return 0;
 505 }
 506
 507 #define PFMF_RESERVED   0xfffc0101UL
 508 #define PFMF_SK         0x00020000UL
 509 #define PFMF_CF         0x00010000UL
 510 #define PFMF_UI         0x00008000UL
 511 #define PFMF_FSC        0x00007000UL
 512 #define PFMF_NQ         0x00000800UL
 513 #define PFMF_MR         0x00000400UL
 514 #define PFMF_MC         0x00000200UL
 515 #define PFMF_KEY        0x000000feUL
 516
 517 static int handle_pfmf(struct kvm_vcpu *vcpu)
 518 {
 519         int reg1, reg2;
 520         unsigned long start, end;
 521
 522         vcpu->stat.instruction_pfmf++;
 523
 524         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 525
 526         if (!MACHINE_HAS_PFMF)
 527                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
 528
 529         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 530                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 531
 532         if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
 533                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 534
 535         /* Only provide non-quiescing support if the host supports it */
 536         if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ && !test_facility(14))
 537                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 538
 539         /* No support for conditional-SSKE */
 540         if (vcpu->run->s.regs.gprs[reg1] & (PFMF_MR | PFMF_MC))
 541                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 542
 543         start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 544         switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
 545         case 0x00000000:
 546                 end = (start + (1UL << 12)) & ~((1UL << 12) - 1);
 547                 break;
 548         case 0x00001000:
 549                 end = (start + (1UL << 20)) & ~((1UL << 20) - 1);
 550                 break;
 551         /* We dont support EDAT2
 552         case 0x00002000:
 553                 end = (start + (1UL << 31)) & ~((1UL << 31) - 1);
 554                 break;*/
 555         default:
 556                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 557         }
 558         while (start < end) {
 559                 unsigned long useraddr;
 560
 561                 useraddr = gmap_translate(start, vcpu->arch.gmap);
 562                 if (IS_ERR((void *)useraddr))
 563                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 564
 565                 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
 566                         if (clear_user((void __user *)useraddr, PAGE_SIZE))
 567                                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 568                 }
 569
 570                 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
 571                         if (set_guest_storage_key(current->mm, useraddr,
 572                                         vcpu->run->s.regs.gprs[reg1] & PFMF_KEY,
 573                                         vcpu->run->s.regs.gprs[reg1] & PFMF_NQ))
 574                                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 575                 }
 576
 577                 start += PAGE_SIZE;
 578         }
 579         if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC)
 580                 vcpu->run->s.regs.gprs[reg2] = end;
 581         return 0;
 582 }
 583
 584 static const intercept_handler_t b9_handlers[256] = {
 585         [0x8d] = handle_epsw,
 586         [0x9c] = handle_io_inst,
 587         [0xaf] = handle_pfmf,
 588 };
 589
 590 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
 591 {
 592         intercept_handler_t handler;
 593
 594         /* This is handled just as for the B2 instructions. */
 595         handler = b9_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
 596         if (handler)
 597                 return handler(vcpu);
 598
 599         return -EOPNOTSUPP;
 600 }
 601
 602 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
 603 {
 604         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
 605         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
 606         u64 useraddr;
 607         u32 val = 0;
 608         int reg, rc;
 609
 610         vcpu->stat.instruction_lctl++;
 611
 612         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 613                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 614
 615         useraddr = kvm_s390_get_base_disp_rs(vcpu);
 616
 617         if (useraddr & 3)
 618                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 619
 620         VCPU_EVENT(vcpu, 5, "lctl r1:%x, r3:%x, addr:%llx", reg1, reg3,
 621                    useraddr);
 622         trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, useraddr);
 623
 624         reg = reg1;
 625         do {
 626                 rc = get_guest(vcpu, val, (u32 __user *) useraddr);
 627                 if (rc)
 628                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 629                 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
 630                 vcpu->arch.sie_block->gcr[reg] |= val;
 631                 useraddr += 4;
 632                 if (reg == reg3)
 633                         break;
 634                 reg = (reg + 1) % 16;
 635         } while (1);
 636
 637         return 0;
 638 }
 639
 640 static int handle_lctlg(struct kvm_vcpu *vcpu)
 641 {
 642         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
 643         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
 644         u64 useraddr;
 645         int reg, rc;
 646
 647         vcpu->stat.instruction_lctlg++;
 648
 649         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 650                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 651
 652         useraddr = kvm_s390_get_base_disp_rsy(vcpu);
 653
 654         if (useraddr & 7)
 655                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 656
 657         reg = reg1;
 658
 659         VCPU_EVENT(vcpu, 5, "lctlg r1:%x, r3:%x, addr:%llx", reg1, reg3,
 660                    useraddr);
 661         trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, useraddr);
 662
 663         do {
 664                 rc = get_guest(vcpu, vcpu->arch.sie_block->gcr[reg],
 665                                (u64 __user *) useraddr);
 666                 if (rc)
 667                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 668                 useraddr += 8;
 669                 if (reg == reg3)
 670                         break;
 671                 reg = (reg + 1) % 16;
 672         } while (1);
 673
 674         return 0;
 675 }
 676
 677 static const intercept_handler_t eb_handlers[256] = {
 678         [0x2f] = handle_lctlg,
 679         [0x8a] = handle_io_inst,
 680 };
 681
 682 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
 683 {
 684         intercept_handler_t handler;
 685
 686         handler = eb_handlers[vcpu->arch.sie_block->ipb & 0xff];
 687         if (handler)
 688                 return handler(vcpu);
 689         return -EOPNOTSUPP;
 690 }
 691
 692 static int handle_tprot(struct kvm_vcpu *vcpu)
 693 {
 694         u64 address1, address2;
 695         struct vm_area_struct *vma;
 696         unsigned long user_address;
 697
 698         vcpu->stat.instruction_tprot++;
 699
 700         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 701                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 702
 703         kvm_s390_get_base_disp_sse(vcpu, &address1, &address2);
 704
 705         /* we only handle the Linux memory detection case:
 706          * access key == 0
 707          * guest DAT == off
 708          * everything else goes to userspace. */
 709         if (address2 & 0xf0)
 710                 return -EOPNOTSUPP;
 711         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
 712                 return -EOPNOTSUPP;
 713
 714         down_read(&current->mm->mmap_sem);
 715         user_address = __gmap_translate(address1, vcpu->arch.gmap);
 716         if (IS_ERR_VALUE(user_address))
 717                 goto out_inject;
 718         vma = find_vma(current->mm, user_address);
 719         if (!vma)
 720                 goto out_inject;
 721         vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
 722         if (!(vma->vm_flags & VM_WRITE) && (vma->vm_flags & VM_READ))
 723                 vcpu->arch.sie_block->gpsw.mask |= (1ul << 44);
 724         if (!(vma->vm_flags & VM_WRITE) && !(vma->vm_flags & VM_READ))
 725                 vcpu->arch.sie_block->gpsw.mask |= (2ul << 44);
 726
 727         up_read(&current->mm->mmap_sem);
 728         return 0;
 729
 730 out_inject:
 731         up_read(&current->mm->mmap_sem);
 732         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 733 }
 734
 735 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
 736 {
 737         /* For e5xx... instructions we only handle TPROT */
 738         if ((vcpu->arch.sie_block->ipa & 0x00ff) == 0x01)
 739                 return handle_tprot(vcpu);
 740         return -EOPNOTSUPP;
 741 }
 742
 743 static int handle_sckpf(struct kvm_vcpu *vcpu)
 744 {
 745         u32 value;
 746
 747         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 748                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 749
 750         if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
 751                 return kvm_s390_inject_program_int(vcpu,
 752                                                    PGM_SPECIFICATION);
 753
 754         value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
 755         vcpu->arch.sie_block->todpr = value;
 756
 757         return 0;
 758 }
 759
 760 static const intercept_handler_t x01_handlers[256] = {
 761         [0x07] = handle_sckpf,
 762 };
 763
 764 int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
 765 {
 766         intercept_handler_t handler;
 767
 768         handler = x01_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
 769         if (handler)
 770                 return handler(vcpu);
 771         return -EOPNOTSUPP;
 772 }