arch/s390/kvm/priv.c

   1 /*
   2  * handling privileged instructions
   3  *
   4  * Copyright IBM Corp. 2008
   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/current.h>
  20 #include <asm/debug.h>
  21 #include <asm/ebcdic.h>
  22 #include <asm/sysinfo.h>
  23 #include <asm/ptrace.h>
  24 #include <asm/compat.h>
  25 #include "gaccess.h"
  26 #include "kvm-s390.h"
  27 #include "trace.h"
  28
  29 static int handle_set_prefix(struct kvm_vcpu *vcpu)
  30 {
  31         u64 operand2;
  32         u32 address = 0;
  33         u8 tmp;
  34
  35         vcpu->stat.instruction_spx++;
  36
  37         operand2 = kvm_s390_get_base_disp_s(vcpu);
  38
  39         /* must be word boundary */
  40         if (operand2 & 3)
  41                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
  42
  43         /* get the value */
  44         if (get_guest(vcpu, address, (u32 __user *) operand2))
  45                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
  46
  47         address = address & 0x7fffe000u;
  48
  49         /* make sure that the new value is valid memory */
  50         if (copy_from_guest_absolute(vcpu, &tmp, address, 1) ||
  51            (copy_from_guest_absolute(vcpu, &tmp, address + PAGE_SIZE, 1)))
  52                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
  53
  54         kvm_s390_set_prefix(vcpu, address);
  55
  56         VCPU_EVENT(vcpu, 5, "setting prefix to %x", address);
  57         trace_kvm_s390_handle_prefix(vcpu, 1, address);
  58         return 0;
  59 }
  60
  61 static int handle_store_prefix(struct kvm_vcpu *vcpu)
  62 {
  63         u64 operand2;
  64         u32 address;
  65
  66         vcpu->stat.instruction_stpx++;
  67
  68         operand2 = kvm_s390_get_base_disp_s(vcpu);
  69
  70         /* must be word boundary */
  71         if (operand2 & 3)
  72                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
  73
  74         address = vcpu->arch.sie_block->prefix;
  75         address = address & 0x7fffe000u;
  76
  77         /* get the value */
  78         if (put_guest(vcpu, address, (u32 __user *)operand2))
  79                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
  80
  81         VCPU_EVENT(vcpu, 5, "storing prefix to %x", address);
  82         trace_kvm_s390_handle_prefix(vcpu, 0, address);
  83         return 0;
  84 }
  85
  86 static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
  87 {
  88         u64 useraddr;
  89
  90         vcpu->stat.instruction_stap++;
  91
  92         useraddr = kvm_s390_get_base_disp_s(vcpu);
  93
  94         if (useraddr & 1)
  95                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
  96
  97         if (put_guest(vcpu, vcpu->vcpu_id, (u16 __user *)useraddr))
  98                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
  99
 100         VCPU_EVENT(vcpu, 5, "storing cpu address to %llx", useraddr);
 101         trace_kvm_s390_handle_stap(vcpu, useraddr);
 102         return 0;
 103 }
 104
 105 static int handle_skey(struct kvm_vcpu *vcpu)
 106 {
 107         vcpu->stat.instruction_storage_key++;
 108         vcpu->arch.sie_block->gpsw.addr -= 4;
 109         VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
 110         return 0;
 111 }
 112
 113 static int handle_tpi(struct kvm_vcpu *vcpu)
 114 {
 115         struct kvm_s390_interrupt_info *inti;
 116         u64 addr;
 117         int cc;
 118
 119         addr = kvm_s390_get_base_disp_s(vcpu);
 120         if (addr & 3)
 121                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 122         cc = 0;
 123         inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->run->s.regs.crs[6], 0);
 124         if (!inti)
 125                 goto no_interrupt;
 126         cc = 1;
 127         if (addr) {
 128                 /*
 129                  * Store the two-word I/O interruption code into the
 130                  * provided area.
 131                  */
 132                 put_guest(vcpu, inti->io.subchannel_id, (u16 __user *) addr);
 133                 put_guest(vcpu, inti->io.subchannel_nr, (u16 __user *) (addr + 2));
 134                 put_guest(vcpu, inti->io.io_int_parm, (u32 __user *) (addr + 4));
 135         } else {
 136                 /*
 137                  * Store the three-word I/O interruption code into
 138                  * the appropriate lowcore area.
 139                  */
 140                 put_guest(vcpu, inti->io.subchannel_id, (u16 __user *) __LC_SUBCHANNEL_ID);
 141                 put_guest(vcpu, inti->io.subchannel_nr, (u16 __user *) __LC_SUBCHANNEL_NR);
 142                 put_guest(vcpu, inti->io.io_int_parm, (u32 __user *) __LC_IO_INT_PARM);
 143                 put_guest(vcpu, inti->io.io_int_word, (u32 __user *) __LC_IO_INT_WORD);
 144         }
 145         kfree(inti);
 146 no_interrupt:
 147         /* Set condition code and we're done. */
 148         vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
 149         vcpu->arch.sie_block->gpsw.mask |= (cc & 3ul) << 44;
 150         return 0;
 151 }
 152
 153 static int handle_tsch(struct kvm_vcpu *vcpu)
 154 {
 155         struct kvm_s390_interrupt_info *inti;
 156
 157         inti = kvm_s390_get_io_int(vcpu->kvm, 0,
 158                                    vcpu->run->s.regs.gprs[1]);
 159
 160         /*
 161          * Prepare exit to userspace.
 162          * We indicate whether we dequeued a pending I/O interrupt
 163          * so that userspace can re-inject it if the instruction gets
 164          * a program check. While this may re-order the pending I/O
 165          * interrupts, this is no problem since the priority is kept
 166          * intact.
 167          */
 168         vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
 169         vcpu->run->s390_tsch.dequeued = !!inti;
 170         if (inti) {
 171                 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
 172                 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
 173                 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
 174                 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
 175         }
 176         vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
 177         kfree(inti);
 178         return -EREMOTE;
 179 }
 180
 181 static int handle_io_inst(struct kvm_vcpu *vcpu)
 182 {
 183         VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
 184
 185         if (vcpu->kvm->arch.css_support) {
 186                 /*
 187                  * Most I/O instructions will be handled by userspace.
 188                  * Exceptions are tpi and the interrupt portion of tsch.
 189                  */
 190                 if (vcpu->arch.sie_block->ipa == 0xb236)
 191                         return handle_tpi(vcpu);
 192                 if (vcpu->arch.sie_block->ipa == 0xb235)
 193                         return handle_tsch(vcpu);
 194                 /* Handle in userspace. */
 195                 return -EOPNOTSUPP;
 196         } else {
 197                 /*
 198                  * Set condition code 3 to stop the guest from issueing channel
 199                  * I/O instructions.
 200                  */
 201                 vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
 202                 vcpu->arch.sie_block->gpsw.mask |= (3 & 3ul) << 44;
 203                 return 0;
 204         }
 205 }
 206
 207 static int handle_stfl(struct kvm_vcpu *vcpu)
 208 {
 209         unsigned int facility_list;
 210         int rc;
 211
 212         vcpu->stat.instruction_stfl++;
 213         /* only pass the facility bits, which we can handle */
 214         facility_list = S390_lowcore.stfl_fac_list & 0xff00fff3;
 215
 216         rc = copy_to_guest(vcpu, offsetof(struct _lowcore, stfl_fac_list),
 217                            &facility_list, sizeof(facility_list));
 218         if (rc)
 219                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 220         VCPU_EVENT(vcpu, 5, "store facility list value %x", facility_list);
 221         trace_kvm_s390_handle_stfl(vcpu, facility_list);
 222         return 0;
 223 }
 224
 225 static void handle_new_psw(struct kvm_vcpu *vcpu)
 226 {
 227         /* Check whether the new psw is enabled for machine checks. */
 228         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK)
 229                 kvm_s390_deliver_pending_machine_checks(vcpu);
 230 }
 231
 232 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
 233 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
 234 #define PSW_ADDR_24 0x0000000000ffffffUL
 235 #define PSW_ADDR_31 0x000000007fffffffUL
 236
 237 static int is_valid_psw(psw_t *psw) {
 238         if (psw->mask & PSW_MASK_UNASSIGNED)
 239                 return 0;
 240         if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
 241                 if (psw->addr & ~PSW_ADDR_31)
 242                         return 0;
 243         }
 244         if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
 245                 return 0;
 246         if ((psw->mask & PSW_MASK_ADDR_MODE) ==  PSW_MASK_EA)
 247                 return 0;
 248         return 1;
 249 }
 250
 251 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
 252 {
 253         psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
 254         psw_compat_t new_psw;
 255         u64 addr;
 256
 257         if (gpsw->mask & PSW_MASK_PSTATE)
 258                 return kvm_s390_inject_program_int(vcpu,
 259                                                    PGM_PRIVILEGED_OPERATION);
 260         addr = kvm_s390_get_base_disp_s(vcpu);
 261         if (addr & 7)
 262                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 263         if (copy_from_guest(vcpu, &new_psw, addr, sizeof(new_psw)))
 264                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 265         if (!(new_psw.mask & PSW32_MASK_BASE))
 266                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 267         gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
 268         gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
 269         gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
 270         if (!is_valid_psw(gpsw))
 271                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 272         handle_new_psw(vcpu);
 273         return 0;
 274 }
 275
 276 static int handle_lpswe(struct kvm_vcpu *vcpu)
 277 {
 278         psw_t new_psw;
 279         u64 addr;
 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         vcpu->arch.sie_block->gpsw = new_psw;
 287         if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
 288                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 289         handle_new_psw(vcpu);
 290         return 0;
 291 }
 292
 293 static int handle_stidp(struct kvm_vcpu *vcpu)
 294 {
 295         u64 operand2;
 296
 297         vcpu->stat.instruction_stidp++;
 298
 299         operand2 = kvm_s390_get_base_disp_s(vcpu);
 300
 301         if (operand2 & 7)
 302                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 303
 304         if (put_guest(vcpu, vcpu->arch.stidp_data, (u64 __user *)operand2))
 305                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 306
 307         VCPU_EVENT(vcpu, 5, "%s", "store cpu id");
 308         return 0;
 309 }
 310
 311 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
 312 {
 313         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
 314         int cpus = 0;
 315         int n;
 316
 317         spin_lock(&fi->lock);
 318         for (n = 0; n < KVM_MAX_VCPUS; n++)
 319                 if (fi->local_int[n])
 320                         cpus++;
 321         spin_unlock(&fi->lock);
 322
 323         /* deal with other level 3 hypervisors */
 324         if (stsi(mem, 3, 2, 2))
 325                 mem->count = 0;
 326         if (mem->count < 8)
 327                 mem->count++;
 328         for (n = mem->count - 1; n > 0 ; n--)
 329                 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
 330
 331         mem->vm[0].cpus_total = cpus;
 332         mem->vm[0].cpus_configured = cpus;
 333         mem->vm[0].cpus_standby = 0;
 334         mem->vm[0].cpus_reserved = 0;
 335         mem->vm[0].caf = 1000;
 336         memcpy(mem->vm[0].name, "KVMguest", 8);
 337         ASCEBC(mem->vm[0].name, 8);
 338         memcpy(mem->vm[0].cpi, "KVM/Linux       ", 16);
 339         ASCEBC(mem->vm[0].cpi, 16);
 340 }
 341
 342 static int handle_stsi(struct kvm_vcpu *vcpu)
 343 {
 344         int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
 345         int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
 346         int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
 347         unsigned long mem = 0;
 348         u64 operand2;
 349         int rc = 0;
 350
 351         vcpu->stat.instruction_stsi++;
 352         VCPU_EVENT(vcpu, 4, "stsi: fc: %x sel1: %x sel2: %x", fc, sel1, sel2);
 353
 354         operand2 = kvm_s390_get_base_disp_s(vcpu);
 355
 356         if (operand2 & 0xfff && fc > 0)
 357                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 358
 359         switch (fc) {
 360         case 0:
 361                 vcpu->run->s.regs.gprs[0] = 3 << 28;
 362                 vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
 363                 return 0;
 364         case 1: /* same handling for 1 and 2 */
 365         case 2:
 366                 mem = get_zeroed_page(GFP_KERNEL);
 367                 if (!mem)
 368                         goto out_no_data;
 369                 if (stsi((void *) mem, fc, sel1, sel2))
 370                         goto out_no_data;
 371                 break;
 372         case 3:
 373                 if (sel1 != 2 || sel2 != 2)
 374                         goto out_no_data;
 375                 mem = get_zeroed_page(GFP_KERNEL);
 376                 if (!mem)
 377                         goto out_no_data;
 378                 handle_stsi_3_2_2(vcpu, (void *) mem);
 379                 break;
 380         default:
 381                 goto out_no_data;
 382         }
 383
 384         if (copy_to_guest_absolute(vcpu, operand2, (void *) mem, PAGE_SIZE)) {
 385                 rc = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 386                 goto out_exception;
 387         }
 388         trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
 389         free_page(mem);
 390         vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
 391         vcpu->run->s.regs.gprs[0] = 0;
 392         return 0;
 393 out_no_data:
 394         /* condition code 3 */
 395         vcpu->arch.sie_block->gpsw.mask |= 3ul << 44;
 396 out_exception:
 397         free_page(mem);
 398         return rc;
 399 }
 400
 401 static const intercept_handler_t b2_handlers[256] = {
 402         [0x02] = handle_stidp,
 403         [0x10] = handle_set_prefix,
 404         [0x11] = handle_store_prefix,
 405         [0x12] = handle_store_cpu_address,
 406         [0x29] = handle_skey,
 407         [0x2a] = handle_skey,
 408         [0x2b] = handle_skey,
 409         [0x30] = handle_io_inst,
 410         [0x31] = handle_io_inst,
 411         [0x32] = handle_io_inst,
 412         [0x33] = handle_io_inst,
 413         [0x34] = handle_io_inst,
 414         [0x35] = handle_io_inst,
 415         [0x36] = handle_io_inst,
 416         [0x37] = handle_io_inst,
 417         [0x38] = handle_io_inst,
 418         [0x39] = handle_io_inst,
 419         [0x3a] = handle_io_inst,
 420         [0x3b] = handle_io_inst,
 421         [0x3c] = handle_io_inst,
 422         [0x5f] = handle_io_inst,
 423         [0x74] = handle_io_inst,
 424         [0x76] = handle_io_inst,
 425         [0x7d] = handle_stsi,
 426         [0xb1] = handle_stfl,
 427         [0xb2] = handle_lpswe,
 428 };
 429
 430 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
 431 {
 432         intercept_handler_t handler;
 433
 434         /*
 435          * a lot of B2 instructions are priviledged. We first check for
 436          * the privileged ones, that we can handle in the kernel. If the
 437          * kernel can handle this instruction, we check for the problem
 438          * state bit and (a) handle the instruction or (b) send a code 2
 439          * program check.
 440          * Anything else goes to userspace.*/
 441         handler = b2_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
 442         if (handler) {
 443                 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 444                         return kvm_s390_inject_program_int(vcpu,
 445                                                    PGM_PRIVILEGED_OPERATION);
 446                 else
 447                         return handler(vcpu);
 448         }
 449         return -EOPNOTSUPP;
 450 }
 451
 452 static int handle_epsw(struct kvm_vcpu *vcpu)
 453 {
 454         int reg1, reg2;
 455
 456         reg1 = (vcpu->arch.sie_block->ipb & 0x00f00000) >> 24;
 457         reg2 = (vcpu->arch.sie_block->ipb & 0x000f0000) >> 16;
 458
 459         /* This basically extracts the mask half of the psw. */
 460         vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000;
 461         vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
 462         if (reg2) {
 463                 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000;
 464                 vcpu->run->s.regs.gprs[reg2] |=
 465                         vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffff;
 466         }
 467         return 0;
 468 }
 469
 470 static const intercept_handler_t b9_handlers[256] = {
 471         [0x8d] = handle_epsw,
 472         [0x9c] = handle_io_inst,
 473 };
 474
 475 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
 476 {
 477         intercept_handler_t handler;
 478
 479         /* This is handled just as for the B2 instructions. */
 480         handler = b9_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
 481         if (handler) {
 482                 if ((handler != handle_epsw) &&
 483                     (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE))
 484                         return kvm_s390_inject_program_int(vcpu,
 485                                                    PGM_PRIVILEGED_OPERATION);
 486                 else
 487                         return handler(vcpu);
 488         }
 489         return -EOPNOTSUPP;
 490 }
 491
 492 static const intercept_handler_t eb_handlers[256] = {
 493         [0x8a] = handle_io_inst,
 494 };
 495
 496 int kvm_s390_handle_priv_eb(struct kvm_vcpu *vcpu)
 497 {
 498         intercept_handler_t handler;
 499
 500         /* All eb instructions that end up here are privileged. */
 501         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 502                 return kvm_s390_inject_program_int(vcpu,
 503                                                    PGM_PRIVILEGED_OPERATION);
 504         handler = eb_handlers[vcpu->arch.sie_block->ipb & 0xff];
 505         if (handler)
 506                 return handler(vcpu);
 507         return -EOPNOTSUPP;
 508 }
 509
 510 static int handle_tprot(struct kvm_vcpu *vcpu)
 511 {
 512         u64 address1, address2;
 513         struct vm_area_struct *vma;
 514         unsigned long user_address;
 515
 516         vcpu->stat.instruction_tprot++;
 517
 518         kvm_s390_get_base_disp_sse(vcpu, &address1, &address2);
 519
 520         /* we only handle the Linux memory detection case:
 521          * access key == 0
 522          * guest DAT == off
 523          * everything else goes to userspace. */
 524         if (address2 & 0xf0)
 525                 return -EOPNOTSUPP;
 526         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
 527                 return -EOPNOTSUPP;
 528
 529         down_read(&current->mm->mmap_sem);
 530         user_address = __gmap_translate(address1, vcpu->arch.gmap);
 531         if (IS_ERR_VALUE(user_address))
 532                 goto out_inject;
 533         vma = find_vma(current->mm, user_address);
 534         if (!vma)
 535                 goto out_inject;
 536         vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
 537         if (!(vma->vm_flags & VM_WRITE) && (vma->vm_flags & VM_READ))
 538                 vcpu->arch.sie_block->gpsw.mask |= (1ul << 44);
 539         if (!(vma->vm_flags & VM_WRITE) && !(vma->vm_flags & VM_READ))
 540                 vcpu->arch.sie_block->gpsw.mask |= (2ul << 44);
 541
 542         up_read(&current->mm->mmap_sem);
 543         return 0;
 544
 545 out_inject:
 546         up_read(&current->mm->mmap_sem);
 547         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 548 }
 549
 550 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
 551 {
 552         /* For e5xx... instructions we only handle TPROT */
 553         if ((vcpu->arch.sie_block->ipa & 0x00ff) == 0x01)
 554                 return handle_tprot(vcpu);
 555         return -EOPNOTSUPP;
 556 }
 557
 558 static int handle_sckpf(struct kvm_vcpu *vcpu)
 559 {
 560         u32 value;
 561
 562         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 563                 return kvm_s390_inject_program_int(vcpu,
 564                                                    PGM_PRIVILEGED_OPERATION);
 565
 566         if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
 567                 return kvm_s390_inject_program_int(vcpu,
 568                                                    PGM_SPECIFICATION);
 569
 570         value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
 571         vcpu->arch.sie_block->todpr = value;
 572
 573         return 0;
 574 }
 575
 576 static const intercept_handler_t x01_handlers[256] = {
 577         [0x07] = handle_sckpf,
 578 };
 579
 580 int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
 581 {
 582         intercept_handler_t handler;
 583
 584         handler = x01_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
 585         if (handler)
 586                 return handler(vcpu);
 587         return -EOPNOTSUPP;
 588 }