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         kvm_s390_set_psw_cc(vcpu, cc);
 168         return 0;
 169 }
 170
 171 static int handle_tsch(struct kvm_vcpu *vcpu)
 172 {
 173         struct kvm_s390_interrupt_info *inti;
 174
 175         inti = kvm_s390_get_io_int(vcpu->kvm, 0,
 176                                    vcpu->run->s.regs.gprs[1]);
 177
 178         /*
 179          * Prepare exit to userspace.
 180          * We indicate whether we dequeued a pending I/O interrupt
 181          * so that userspace can re-inject it if the instruction gets
 182          * a program check. While this may re-order the pending I/O
 183          * interrupts, this is no problem since the priority is kept
 184          * intact.
 185          */
 186         vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
 187         vcpu->run->s390_tsch.dequeued = !!inti;
 188         if (inti) {
 189                 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
 190                 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
 191                 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
 192                 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
 193         }
 194         vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
 195         kfree(inti);
 196         return -EREMOTE;
 197 }
 198
 199 static int handle_io_inst(struct kvm_vcpu *vcpu)
 200 {
 201         VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
 202
 203         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 204                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 205
 206         if (vcpu->kvm->arch.css_support) {
 207                 /*
 208                  * Most I/O instructions will be handled by userspace.
 209                  * Exceptions are tpi and the interrupt portion of tsch.
 210                  */
 211                 if (vcpu->arch.sie_block->ipa == 0xb236)
 212                         return handle_tpi(vcpu);
 213                 if (vcpu->arch.sie_block->ipa == 0xb235)
 214                         return handle_tsch(vcpu);
 215                 /* Handle in userspace. */
 216                 return -EOPNOTSUPP;
 217         } else {
 218                 /*
 219                  * Set condition code 3 to stop the guest from issueing channel
 220                  * I/O instructions.
 221                  */
 222                 kvm_s390_set_psw_cc(vcpu, 3);
 223                 return 0;
 224         }
 225 }
 226
 227 static int handle_stfl(struct kvm_vcpu *vcpu)
 228 {
 229         int rc;
 230
 231         vcpu->stat.instruction_stfl++;
 232
 233         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 234                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 235
 236         rc = copy_to_guest(vcpu, offsetof(struct _lowcore, stfl_fac_list),
 237                            vfacilities, 4);
 238         if (rc)
 239                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 240         VCPU_EVENT(vcpu, 5, "store facility list value %x",
 241                    *(unsigned int *) vfacilities);
 242         trace_kvm_s390_handle_stfl(vcpu, *(unsigned int *) vfacilities);
 243         return 0;
 244 }
 245
 246 static void handle_new_psw(struct kvm_vcpu *vcpu)
 247 {
 248         /* Check whether the new psw is enabled for machine checks. */
 249         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK)
 250                 kvm_s390_deliver_pending_machine_checks(vcpu);
 251 }
 252
 253 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
 254 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
 255 #define PSW_ADDR_24 0x0000000000ffffffUL
 256 #define PSW_ADDR_31 0x000000007fffffffUL
 257
 258 static int is_valid_psw(psw_t *psw) {
 259         if (psw->mask & PSW_MASK_UNASSIGNED)
 260                 return 0;
 261         if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
 262                 if (psw->addr & ~PSW_ADDR_31)
 263                         return 0;
 264         }
 265         if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
 266                 return 0;
 267         if ((psw->mask & PSW_MASK_ADDR_MODE) ==  PSW_MASK_EA)
 268                 return 0;
 269         return 1;
 270 }
 271
 272 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
 273 {
 274         psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
 275         psw_compat_t new_psw;
 276         u64 addr;
 277
 278         if (gpsw->mask & PSW_MASK_PSTATE)
 279                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 280
 281         addr = kvm_s390_get_base_disp_s(vcpu);
 282         if (addr & 7)
 283                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 284         if (copy_from_guest(vcpu, &new_psw, addr, sizeof(new_psw)))
 285                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 286         if (!(new_psw.mask & PSW32_MASK_BASE))
 287                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 288         gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
 289         gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
 290         gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
 291         if (!is_valid_psw(gpsw))
 292                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 293         handle_new_psw(vcpu);
 294         return 0;
 295 }
 296
 297 static int handle_lpswe(struct kvm_vcpu *vcpu)
 298 {
 299         psw_t new_psw;
 300         u64 addr;
 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         addr = kvm_s390_get_base_disp_s(vcpu);
 306         if (addr & 7)
 307                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 308         if (copy_from_guest(vcpu, &new_psw, addr, sizeof(new_psw)))
 309                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 310         vcpu->arch.sie_block->gpsw = new_psw;
 311         if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
 312                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 313         handle_new_psw(vcpu);
 314         return 0;
 315 }
 316
 317 static int handle_stidp(struct kvm_vcpu *vcpu)
 318 {
 319         u64 operand2;
 320
 321         vcpu->stat.instruction_stidp++;
 322
 323         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 324                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 325
 326         operand2 = kvm_s390_get_base_disp_s(vcpu);
 327
 328         if (operand2 & 7)
 329                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 330
 331         if (put_guest(vcpu, vcpu->arch.stidp_data, (u64 __user *)operand2))
 332                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 333
 334         VCPU_EVENT(vcpu, 5, "%s", "store cpu id");
 335         return 0;
 336 }
 337
 338 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
 339 {
 340         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
 341         int cpus = 0;
 342         int n;
 343
 344         spin_lock(&fi->lock);
 345         for (n = 0; n < KVM_MAX_VCPUS; n++)
 346                 if (fi->local_int[n])
 347                         cpus++;
 348         spin_unlock(&fi->lock);
 349
 350         /* deal with other level 3 hypervisors */
 351         if (stsi(mem, 3, 2, 2))
 352                 mem->count = 0;
 353         if (mem->count < 8)
 354                 mem->count++;
 355         for (n = mem->count - 1; n > 0 ; n--)
 356                 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
 357
 358         memset(&mem->vm[0], 0, sizeof(mem->vm[0]));
 359         mem->vm[0].cpus_total = cpus;
 360         mem->vm[0].cpus_configured = cpus;
 361         mem->vm[0].cpus_standby = 0;
 362         mem->vm[0].cpus_reserved = 0;
 363         mem->vm[0].caf = 1000;
 364         memcpy(mem->vm[0].name, "KVMguest", 8);
 365         ASCEBC(mem->vm[0].name, 8);
 366         memcpy(mem->vm[0].cpi, "KVM/Linux       ", 16);
 367         ASCEBC(mem->vm[0].cpi, 16);
 368 }
 369
 370 static int handle_stsi(struct kvm_vcpu *vcpu)
 371 {
 372         int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
 373         int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
 374         int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
 375         unsigned long mem = 0;
 376         u64 operand2;
 377         int rc = 0;
 378
 379         vcpu->stat.instruction_stsi++;
 380         VCPU_EVENT(vcpu, 4, "stsi: fc: %x sel1: %x sel2: %x", fc, sel1, sel2);
 381
 382         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 383                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 384
 385         if (fc > 3) {
 386                 kvm_s390_set_psw_cc(vcpu, 3);
 387                 return 0;
 388         }
 389
 390         if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
 391             || vcpu->run->s.regs.gprs[1] & 0xffff0000)
 392                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 393
 394         if (fc == 0) {
 395                 vcpu->run->s.regs.gprs[0] = 3 << 28;
 396                 kvm_s390_set_psw_cc(vcpu, 0);
 397                 return 0;
 398         }
 399
 400         operand2 = kvm_s390_get_base_disp_s(vcpu);
 401
 402         if (operand2 & 0xfff)
 403                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 404
 405         switch (fc) {
 406         case 1: /* same handling for 1 and 2 */
 407         case 2:
 408                 mem = get_zeroed_page(GFP_KERNEL);
 409                 if (!mem)
 410                         goto out_no_data;
 411                 if (stsi((void *) mem, fc, sel1, sel2))
 412                         goto out_no_data;
 413                 break;
 414         case 3:
 415                 if (sel1 != 2 || sel2 != 2)
 416                         goto out_no_data;
 417                 mem = get_zeroed_page(GFP_KERNEL);
 418                 if (!mem)
 419                         goto out_no_data;
 420                 handle_stsi_3_2_2(vcpu, (void *) mem);
 421                 break;
 422         }
 423
 424         if (copy_to_guest_absolute(vcpu, operand2, (void *) mem, PAGE_SIZE)) {
 425                 rc = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 426                 goto out_exception;
 427         }
 428         trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
 429         free_page(mem);
 430         kvm_s390_set_psw_cc(vcpu, 0);
 431         vcpu->run->s.regs.gprs[0] = 0;
 432         return 0;
 433 out_no_data:
 434         kvm_s390_set_psw_cc(vcpu, 3);
 435 out_exception:
 436         free_page(mem);
 437         return rc;
 438 }
 439
 440 static const intercept_handler_t b2_handlers[256] = {
 441         [0x02] = handle_stidp,
 442         [0x10] = handle_set_prefix,
 443         [0x11] = handle_store_prefix,
 444         [0x12] = handle_store_cpu_address,
 445         [0x29] = handle_skey,
 446         [0x2a] = handle_skey,
 447         [0x2b] = handle_skey,
 448         [0x30] = handle_io_inst,
 449         [0x31] = handle_io_inst,
 450         [0x32] = handle_io_inst,
 451         [0x33] = handle_io_inst,
 452         [0x34] = handle_io_inst,
 453         [0x35] = handle_io_inst,
 454         [0x36] = handle_io_inst,
 455         [0x37] = handle_io_inst,
 456         [0x38] = handle_io_inst,
 457         [0x39] = handle_io_inst,
 458         [0x3a] = handle_io_inst,
 459         [0x3b] = handle_io_inst,
 460         [0x3c] = handle_io_inst,
 461         [0x5f] = handle_io_inst,
 462         [0x74] = handle_io_inst,
 463         [0x76] = handle_io_inst,
 464         [0x7d] = handle_stsi,
 465         [0xb1] = handle_stfl,
 466         [0xb2] = handle_lpswe,
 467 };
 468
 469 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
 470 {
 471         intercept_handler_t handler;
 472
 473         /*
 474          * A lot of B2 instructions are priviledged. Here we check for
 475          * the privileged ones, that we can handle in the kernel.
 476          * Anything else goes to userspace.
 477          */
 478         handler = b2_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
 479         if (handler)
 480                 return handler(vcpu);
 481
 482         return -EOPNOTSUPP;
 483 }
 484
 485 static int handle_epsw(struct kvm_vcpu *vcpu)
 486 {
 487         int reg1, reg2;
 488
 489         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 490
 491         /* This basically extracts the mask half of the psw. */
 492         vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
 493         vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
 494         if (reg2) {
 495                 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
 496                 vcpu->run->s.regs.gprs[reg2] |=
 497                         vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
 498         }
 499         return 0;
 500 }
 501
 502 #define PFMF_RESERVED   0xfffc0101UL
 503 #define PFMF_SK         0x00020000UL
 504 #define PFMF_CF         0x00010000UL
 505 #define PFMF_UI         0x00008000UL
 506 #define PFMF_FSC        0x00007000UL
 507 #define PFMF_NQ         0x00000800UL
 508 #define PFMF_MR         0x00000400UL
 509 #define PFMF_MC         0x00000200UL
 510 #define PFMF_KEY        0x000000feUL
 511
 512 static int handle_pfmf(struct kvm_vcpu *vcpu)
 513 {
 514         int reg1, reg2;
 515         unsigned long start, end;
 516
 517         vcpu->stat.instruction_pfmf++;
 518
 519         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
 520
 521         if (!MACHINE_HAS_PFMF)
 522                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
 523
 524         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 525                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 526
 527         if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
 528                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 529
 530         /* Only provide non-quiescing support if the host supports it */
 531         if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ && !test_facility(14))
 532                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 533
 534         /* No support for conditional-SSKE */
 535         if (vcpu->run->s.regs.gprs[reg1] & (PFMF_MR | PFMF_MC))
 536                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 537
 538         start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 539         switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
 540         case 0x00000000:
 541                 end = (start + (1UL << 12)) & ~((1UL << 12) - 1);
 542                 break;
 543         case 0x00001000:
 544                 end = (start + (1UL << 20)) & ~((1UL << 20) - 1);
 545                 break;
 546         /* We dont support EDAT2
 547         case 0x00002000:
 548                 end = (start + (1UL << 31)) & ~((1UL << 31) - 1);
 549                 break;*/
 550         default:
 551                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 552         }
 553         while (start < end) {
 554                 unsigned long useraddr;
 555
 556                 useraddr = gmap_translate(start, vcpu->arch.gmap);
 557                 if (IS_ERR((void *)useraddr))
 558                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 559
 560                 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
 561                         if (clear_user((void __user *)useraddr, PAGE_SIZE))
 562                                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 563                 }
 564
 565                 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
 566                         if (set_guest_storage_key(current->mm, useraddr,
 567                                         vcpu->run->s.regs.gprs[reg1] & PFMF_KEY,
 568                                         vcpu->run->s.regs.gprs[reg1] & PFMF_NQ))
 569                                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 570                 }
 571
 572                 start += PAGE_SIZE;
 573         }
 574         if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC)
 575                 vcpu->run->s.regs.gprs[reg2] = end;
 576         return 0;
 577 }
 578
 579 static const intercept_handler_t b9_handlers[256] = {
 580         [0x8d] = handle_epsw,
 581         [0x9c] = handle_io_inst,
 582         [0xaf] = handle_pfmf,
 583 };
 584
 585 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
 586 {
 587         intercept_handler_t handler;
 588
 589         /* This is handled just as for the B2 instructions. */
 590         handler = b9_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
 591         if (handler)
 592                 return handler(vcpu);
 593
 594         return -EOPNOTSUPP;
 595 }
 596
 597 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
 598 {
 599         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
 600         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
 601         u64 useraddr;
 602         u32 val = 0;
 603         int reg, rc;
 604
 605         vcpu->stat.instruction_lctl++;
 606
 607         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 608                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 609
 610         useraddr = kvm_s390_get_base_disp_rs(vcpu);
 611
 612         if (useraddr & 3)
 613                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 614
 615         VCPU_EVENT(vcpu, 5, "lctl r1:%x, r3:%x, addr:%llx", reg1, reg3,
 616                    useraddr);
 617         trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, useraddr);
 618
 619         reg = reg1;
 620         do {
 621                 rc = get_guest(vcpu, val, (u32 __user *) useraddr);
 622                 if (rc)
 623                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 624                 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
 625                 vcpu->arch.sie_block->gcr[reg] |= val;
 626                 useraddr += 4;
 627                 if (reg == reg3)
 628                         break;
 629                 reg = (reg + 1) % 16;
 630         } while (1);
 631
 632         return 0;
 633 }
 634
 635 static int handle_lctlg(struct kvm_vcpu *vcpu)
 636 {
 637         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
 638         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
 639         u64 useraddr;
 640         int reg, rc;
 641
 642         vcpu->stat.instruction_lctlg++;
 643
 644         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 645                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 646
 647         useraddr = kvm_s390_get_base_disp_rsy(vcpu);
 648
 649         if (useraddr & 7)
 650                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 651
 652         reg = reg1;
 653
 654         VCPU_EVENT(vcpu, 5, "lctlg r1:%x, r3:%x, addr:%llx", reg1, reg3,
 655                    useraddr);
 656         trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, useraddr);
 657
 658         do {
 659                 rc = get_guest(vcpu, vcpu->arch.sie_block->gcr[reg],
 660                                (u64 __user *) useraddr);
 661                 if (rc)
 662                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 663                 useraddr += 8;
 664                 if (reg == reg3)
 665                         break;
 666                 reg = (reg + 1) % 16;
 667         } while (1);
 668
 669         return 0;
 670 }
 671
 672 static const intercept_handler_t eb_handlers[256] = {
 673         [0x2f] = handle_lctlg,
 674         [0x8a] = handle_io_inst,
 675 };
 676
 677 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
 678 {
 679         intercept_handler_t handler;
 680
 681         handler = eb_handlers[vcpu->arch.sie_block->ipb & 0xff];
 682         if (handler)
 683                 return handler(vcpu);
 684         return -EOPNOTSUPP;
 685 }
 686
 687 static int handle_tprot(struct kvm_vcpu *vcpu)
 688 {
 689         u64 address1, address2;
 690         struct vm_area_struct *vma;
 691         unsigned long user_address;
 692
 693         vcpu->stat.instruction_tprot++;
 694
 695         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 696                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 697
 698         kvm_s390_get_base_disp_sse(vcpu, &address1, &address2);
 699
 700         /* we only handle the Linux memory detection case:
 701          * access key == 0
 702          * guest DAT == off
 703          * everything else goes to userspace. */
 704         if (address2 & 0xf0)
 705                 return -EOPNOTSUPP;
 706         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
 707                 return -EOPNOTSUPP;
 708
 709         down_read(&current->mm->mmap_sem);
 710         user_address = __gmap_translate(address1, vcpu->arch.gmap);
 711         if (IS_ERR_VALUE(user_address))
 712                 goto out_inject;
 713         vma = find_vma(current->mm, user_address);
 714         if (!vma)
 715                 goto out_inject;
 716         vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
 717         if (!(vma->vm_flags & VM_WRITE) && (vma->vm_flags & VM_READ))
 718                 vcpu->arch.sie_block->gpsw.mask |= (1ul << 44);
 719         if (!(vma->vm_flags & VM_WRITE) && !(vma->vm_flags & VM_READ))
 720                 vcpu->arch.sie_block->gpsw.mask |= (2ul << 44);
 721
 722         up_read(&current->mm->mmap_sem);
 723         return 0;
 724
 725 out_inject:
 726         up_read(&current->mm->mmap_sem);
 727         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 728 }
 729
 730 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
 731 {
 732         /* For e5xx... instructions we only handle TPROT */
 733         if ((vcpu->arch.sie_block->ipa & 0x00ff) == 0x01)
 734                 return handle_tprot(vcpu);
 735         return -EOPNOTSUPP;
 736 }
 737
 738 static int handle_sckpf(struct kvm_vcpu *vcpu)
 739 {
 740         u32 value;
 741
 742         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 743                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 744
 745         if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
 746                 return kvm_s390_inject_program_int(vcpu,
 747                                                    PGM_SPECIFICATION);
 748
 749         value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
 750         vcpu->arch.sie_block->todpr = value;
 751
 752         return 0;
 753 }
 754
 755 static const intercept_handler_t x01_handlers[256] = {
 756         [0x07] = handle_sckpf,
 757 };
 758
 759 int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
 760 {
 761         intercept_handler_t handler;
 762
 763         handler = x01_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
 764         if (handler)
 765                 return handler(vcpu);
 766         return -EOPNOTSUPP;
 767 }