arch/powerpc/kvm/book3s_emulate.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License, version 2, as
   4  * published by the Free Software Foundation.
   5  *
   6  * This program is distributed in the hope that it will be useful,
   7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   9  * GNU General Public License for more details.
  10  *
  11  * You should have received a copy of the GNU General Public License
  12  * along with this program; if not, write to the Free Software
  13  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  14  *
  15  * Copyright SUSE Linux Products GmbH 2009
  16  *
  17  * Authors: Alexander Graf <agraf@suse.de>
  18  */
  19
  20 #include <asm/kvm_ppc.h>
  21 #include <asm/disassemble.h>
  22 #include <asm/kvm_book3s.h>
  23 #include <asm/reg.h>
  24 #include <asm/switch_to.h>
  25 #include <asm/time.h>
  26
  27 #define OP_19_XOP_RFID          18
  28 #define OP_19_XOP_RFI           50
  29
  30 #define OP_31_XOP_MFMSR         83
  31 #define OP_31_XOP_MTMSR         146
  32 #define OP_31_XOP_MTMSRD        178
  33 #define OP_31_XOP_MTSR          210
  34 #define OP_31_XOP_MTSRIN        242
  35 #define OP_31_XOP_TLBIEL        274
  36 #define OP_31_XOP_TLBIE         306
  37 /* Opcode is officially reserved, reuse it as sc 1 when sc 1 doesn't trap */
  38 #define OP_31_XOP_FAKE_SC1      308
  39 #define OP_31_XOP_SLBMTE        402
  40 #define OP_31_XOP_SLBIE         434
  41 #define OP_31_XOP_SLBIA         498
  42 #define OP_31_XOP_MFSR          595
  43 #define OP_31_XOP_MFSRIN        659
  44 #define OP_31_XOP_DCBA          758
  45 #define OP_31_XOP_SLBMFEV       851
  46 #define OP_31_XOP_EIOIO         854
  47 #define OP_31_XOP_SLBMFEE       915
  48
  49 /* DCBZ is actually 1014, but we patch it to 1010 so we get a trap */
  50 #define OP_31_XOP_DCBZ          1010
  51
  52 #define OP_LFS                  48
  53 #define OP_LFD                  50
  54 #define OP_STFS                 52
  55 #define OP_STFD                 54
  56
  57 #define SPRN_GQR0               912
  58 #define SPRN_GQR1               913
  59 #define SPRN_GQR2               914
  60 #define SPRN_GQR3               915
  61 #define SPRN_GQR4               916
  62 #define SPRN_GQR5               917
  63 #define SPRN_GQR6               918
  64 #define SPRN_GQR7               919
  65
  66 /* Book3S_32 defines mfsrin(v) - but that messes up our abstract
  67  * function pointers, so let's just disable the define. */
  68 #undef mfsrin
  69
  70 enum priv_level {
  71         PRIV_PROBLEM = 0,
  72         PRIV_SUPER = 1,
  73         PRIV_HYPER = 2,
  74 };
  75
  76 static bool spr_allowed(struct kvm_vcpu *vcpu, enum priv_level level)
  77 {
  78         /* PAPR VMs only access supervisor SPRs */
  79         if (vcpu->arch.papr_enabled && (level > PRIV_SUPER))
  80                 return false;
  81
  82         /* Limit user space to its own small SPR set */
  83         if ((vcpu->arch.shared->msr & MSR_PR) && level > PRIV_PROBLEM)
  84                 return false;
  85
  86         return true;
  87 }
  88
  89 int kvmppc_core_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu,
  90                            unsigned int inst, int *advance)
  91 {
  92         int emulated = EMULATE_DONE;
  93         int rt = get_rt(inst);
  94         int rs = get_rs(inst);
  95         int ra = get_ra(inst);
  96         int rb = get_rb(inst);
  97
  98         switch (get_op(inst)) {
  99         case 19:
 100                 switch (get_xop(inst)) {
 101                 case OP_19_XOP_RFID:
 102                 case OP_19_XOP_RFI:
 103                         kvmppc_set_pc(vcpu, vcpu->arch.shared->srr0);
 104                         kvmppc_set_msr(vcpu, vcpu->arch.shared->srr1);
 105                         *advance = 0;
 106                         break;
 107
 108                 default:
 109                         emulated = EMULATE_FAIL;
 110                         break;
 111                 }
 112                 break;
 113         case 31:
 114                 switch (get_xop(inst)) {
 115                 case OP_31_XOP_MFMSR:
 116                         kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->msr);
 117                         break;
 118                 case OP_31_XOP_MTMSRD:
 119                 {
 120                         ulong rs_val = kvmppc_get_gpr(vcpu, rs);
 121                         if (inst & 0x10000) {
 122                                 ulong new_msr = vcpu->arch.shared->msr;
 123                                 new_msr &= ~(MSR_RI | MSR_EE);
 124                                 new_msr |= rs_val & (MSR_RI | MSR_EE);
 125                                 vcpu->arch.shared->msr = new_msr;
 126                         } else
 127                                 kvmppc_set_msr(vcpu, rs_val);
 128                         break;
 129                 }
 130                 case OP_31_XOP_MTMSR:
 131                         kvmppc_set_msr(vcpu, kvmppc_get_gpr(vcpu, rs));
 132                         break;
 133                 case OP_31_XOP_MFSR:
 134                 {
 135                         int srnum;
 136
 137                         srnum = kvmppc_get_field(inst, 12 + 32, 15 + 32);
 138                         if (vcpu->arch.mmu.mfsrin) {
 139                                 u32 sr;
 140                                 sr = vcpu->arch.mmu.mfsrin(vcpu, srnum);
 141                                 kvmppc_set_gpr(vcpu, rt, sr);
 142                         }
 143                         break;
 144                 }
 145                 case OP_31_XOP_MFSRIN:
 146                 {
 147                         int srnum;
 148
 149                         srnum = (kvmppc_get_gpr(vcpu, rb) >> 28) & 0xf;
 150                         if (vcpu->arch.mmu.mfsrin) {
 151                                 u32 sr;
 152                                 sr = vcpu->arch.mmu.mfsrin(vcpu, srnum);
 153                                 kvmppc_set_gpr(vcpu, rt, sr);
 154                         }
 155                         break;
 156                 }
 157                 case OP_31_XOP_MTSR:
 158                         vcpu->arch.mmu.mtsrin(vcpu,
 159                                 (inst >> 16) & 0xf,
 160                                 kvmppc_get_gpr(vcpu, rs));
 161                         break;
 162                 case OP_31_XOP_MTSRIN:
 163                         vcpu->arch.mmu.mtsrin(vcpu,
 164                                 (kvmppc_get_gpr(vcpu, rb) >> 28) & 0xf,
 165                                 kvmppc_get_gpr(vcpu, rs));
 166                         break;
 167                 case OP_31_XOP_TLBIE:
 168                 case OP_31_XOP_TLBIEL:
 169                 {
 170                         bool large = (inst & 0x00200000) ? true : false;
 171                         ulong addr = kvmppc_get_gpr(vcpu, rb);
 172                         vcpu->arch.mmu.tlbie(vcpu, addr, large);
 173                         break;
 174                 }
 175 #ifdef CONFIG_KVM_BOOK3S_64_PR
 176                 case OP_31_XOP_FAKE_SC1:
 177                 {
 178                         /* SC 1 papr hypercalls */
 179                         ulong cmd = kvmppc_get_gpr(vcpu, 3);
 180                         int i;
 181
 182                         if ((vcpu->arch.shared->msr & MSR_PR) ||
 183                             !vcpu->arch.papr_enabled) {
 184                                 emulated = EMULATE_FAIL;
 185                                 break;
 186                         }
 187
 188                         if (kvmppc_h_pr(vcpu, cmd) == EMULATE_DONE)
 189                                 break;
 190
 191                         run->papr_hcall.nr = cmd;
 192                         for (i = 0; i < 9; ++i) {
 193                                 ulong gpr = kvmppc_get_gpr(vcpu, 4 + i);
 194                                 run->papr_hcall.args[i] = gpr;
 195                         }
 196
 197                         run->exit_reason = KVM_EXIT_PAPR_HCALL;
 198                         vcpu->arch.hcall_needed = 1;
 199                         emulated = EMULATE_EXIT_USER;
 200                         break;
 201                 }
 202 #endif
 203                 case OP_31_XOP_EIOIO:
 204                         break;
 205                 case OP_31_XOP_SLBMTE:
 206                         if (!vcpu->arch.mmu.slbmte)
 207                                 return EMULATE_FAIL;
 208
 209                         vcpu->arch.mmu.slbmte(vcpu,
 210                                         kvmppc_get_gpr(vcpu, rs),
 211                                         kvmppc_get_gpr(vcpu, rb));
 212                         break;
 213                 case OP_31_XOP_SLBIE:
 214                         if (!vcpu->arch.mmu.slbie)
 215                                 return EMULATE_FAIL;
 216
 217                         vcpu->arch.mmu.slbie(vcpu,
 218                                         kvmppc_get_gpr(vcpu, rb));
 219                         break;
 220                 case OP_31_XOP_SLBIA:
 221                         if (!vcpu->arch.mmu.slbia)
 222                                 return EMULATE_FAIL;
 223
 224                         vcpu->arch.mmu.slbia(vcpu);
 225                         break;
 226                 case OP_31_XOP_SLBMFEE:
 227                         if (!vcpu->arch.mmu.slbmfee) {
 228                                 emulated = EMULATE_FAIL;
 229                         } else {
 230                                 ulong t, rb_val;
 231
 232                                 rb_val = kvmppc_get_gpr(vcpu, rb);
 233                                 t = vcpu->arch.mmu.slbmfee(vcpu, rb_val);
 234                                 kvmppc_set_gpr(vcpu, rt, t);
 235                         }
 236                         break;
 237                 case OP_31_XOP_SLBMFEV:
 238                         if (!vcpu->arch.mmu.slbmfev) {
 239                                 emulated = EMULATE_FAIL;
 240                         } else {
 241                                 ulong t, rb_val;
 242
 243                                 rb_val = kvmppc_get_gpr(vcpu, rb);
 244                                 t = vcpu->arch.mmu.slbmfev(vcpu, rb_val);
 245                                 kvmppc_set_gpr(vcpu, rt, t);
 246                         }
 247                         break;
 248                 case OP_31_XOP_DCBA:
 249                         /* Gets treated as NOP */
 250                         break;
 251                 case OP_31_XOP_DCBZ:
 252                 {
 253                         ulong rb_val = kvmppc_get_gpr(vcpu, rb);
 254                         ulong ra_val = 0;
 255                         ulong addr, vaddr;
 256                         u32 zeros[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
 257                         u32 dsisr;
 258                         int r;
 259
 260                         if (ra)
 261                                 ra_val = kvmppc_get_gpr(vcpu, ra);
 262
 263                         addr = (ra_val + rb_val) & ~31ULL;
 264                         if (!(vcpu->arch.shared->msr & MSR_SF))
 265                                 addr &= 0xffffffff;
 266                         vaddr = addr;
 267
 268                         r = kvmppc_st(vcpu, &addr, 32, zeros, true);
 269                         if ((r == -ENOENT) || (r == -EPERM)) {
 270                                 struct kvmppc_book3s_shadow_vcpu *svcpu;
 271
 272                                 svcpu = svcpu_get(vcpu);
 273                                 *advance = 0;
 274                                 vcpu->arch.shared->dar = vaddr;
 275                                 svcpu->fault_dar = vaddr;
 276
 277                                 dsisr = DSISR_ISSTORE;
 278                                 if (r == -ENOENT)
 279                                         dsisr |= DSISR_NOHPTE;
 280                                 else if (r == -EPERM)
 281                                         dsisr |= DSISR_PROTFAULT;
 282
 283                                 vcpu->arch.shared->dsisr = dsisr;
 284                                 svcpu->fault_dsisr = dsisr;
 285                                 svcpu_put(svcpu);
 286
 287                                 kvmppc_book3s_queue_irqprio(vcpu,
 288                                         BOOK3S_INTERRUPT_DATA_STORAGE);
 289                         }
 290
 291                         break;
 292                 }
 293                 default:
 294                         emulated = EMULATE_FAIL;
 295                 }
 296                 break;
 297         default:
 298                 emulated = EMULATE_FAIL;
 299         }
 300
 301         if (emulated == EMULATE_FAIL)
 302                 emulated = kvmppc_emulate_paired_single(run, vcpu);
 303
 304         return emulated;
 305 }
 306
 307 void kvmppc_set_bat(struct kvm_vcpu *vcpu, struct kvmppc_bat *bat, bool upper,
 308                     u32 val)
 309 {
 310         if (upper) {
 311                 /* Upper BAT */
 312                 u32 bl = (val >> 2) & 0x7ff;
 313                 bat->bepi_mask = (~bl << 17);
 314                 bat->bepi = val & 0xfffe0000;
 315                 bat->vs = (val & 2) ? 1 : 0;
 316                 bat->vp = (val & 1) ? 1 : 0;
 317                 bat->raw = (bat->raw & 0xffffffff00000000ULL) | val;
 318         } else {
 319                 /* Lower BAT */
 320                 bat->brpn = val & 0xfffe0000;
 321                 bat->wimg = (val >> 3) & 0xf;
 322                 bat->pp = val & 3;
 323                 bat->raw = (bat->raw & 0x00000000ffffffffULL) | ((u64)val << 32);
 324         }
 325 }
 326
 327 static struct kvmppc_bat *kvmppc_find_bat(struct kvm_vcpu *vcpu, int sprn)
 328 {
 329         struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
 330         struct kvmppc_bat *bat;
 331
 332         switch (sprn) {
 333         case SPRN_IBAT0U ... SPRN_IBAT3L:
 334                 bat = &vcpu_book3s->ibat[(sprn - SPRN_IBAT0U) / 2];
 335                 break;
 336         case SPRN_IBAT4U ... SPRN_IBAT7L:
 337                 bat = &vcpu_book3s->ibat[4 + ((sprn - SPRN_IBAT4U) / 2)];
 338                 break;
 339         case SPRN_DBAT0U ... SPRN_DBAT3L:
 340                 bat = &vcpu_book3s->dbat[(sprn - SPRN_DBAT0U) / 2];
 341                 break;
 342         case SPRN_DBAT4U ... SPRN_DBAT7L:
 343                 bat = &vcpu_book3s->dbat[4 + ((sprn - SPRN_DBAT4U) / 2)];
 344                 break;
 345         default:
 346                 BUG();
 347         }
 348
 349         return bat;
 350 }
 351
 352 int kvmppc_core_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, ulong spr_val)
 353 {
 354         int emulated = EMULATE_DONE;
 355
 356         switch (sprn) {
 357         case SPRN_SDR1:
 358                 if (!spr_allowed(vcpu, PRIV_HYPER))
 359                         goto unprivileged;
 360                 to_book3s(vcpu)->sdr1 = spr_val;
 361                 break;
 362         case SPRN_DSISR:
 363                 vcpu->arch.shared->dsisr = spr_val;
 364                 break;
 365         case SPRN_DAR:
 366                 vcpu->arch.shared->dar = spr_val;
 367                 break;
 368         case SPRN_HIOR:
 369                 to_book3s(vcpu)->hior = spr_val;
 370                 break;
 371         case SPRN_IBAT0U ... SPRN_IBAT3L:
 372         case SPRN_IBAT4U ... SPRN_IBAT7L:
 373         case SPRN_DBAT0U ... SPRN_DBAT3L:
 374         case SPRN_DBAT4U ... SPRN_DBAT7L:
 375         {
 376                 struct kvmppc_bat *bat = kvmppc_find_bat(vcpu, sprn);
 377
 378                 kvmppc_set_bat(vcpu, bat, !(sprn % 2), (u32)spr_val);
 379                 /* BAT writes happen so rarely that we're ok to flush
 380                  * everything here */
 381                 kvmppc_mmu_pte_flush(vcpu, 0, 0);
 382                 kvmppc_mmu_flush_segments(vcpu);
 383                 break;
 384         }
 385         case SPRN_HID0:
 386                 to_book3s(vcpu)->hid[0] = spr_val;
 387                 break;
 388         case SPRN_HID1:
 389                 to_book3s(vcpu)->hid[1] = spr_val;
 390                 break;
 391         case SPRN_HID2:
 392                 to_book3s(vcpu)->hid[2] = spr_val;
 393                 break;
 394         case SPRN_HID2_GEKKO:
 395                 to_book3s(vcpu)->hid[2] = spr_val;
 396                 /* HID2.PSE controls paired single on gekko */
 397                 switch (vcpu->arch.pvr) {
 398                 case 0x00080200:        /* lonestar 2.0 */
 399                 case 0x00088202:        /* lonestar 2.2 */
 400                 case 0x70000100:        /* gekko 1.0 */
 401                 case 0x00080100:        /* gekko 2.0 */
 402                 case 0x00083203:        /* gekko 2.3a */
 403                 case 0x00083213:        /* gekko 2.3b */
 404                 case 0x00083204:        /* gekko 2.4 */
 405                 case 0x00083214:        /* gekko 2.4e (8SE) - retail HW2 */
 406                 case 0x00087200:        /* broadway */
 407                         if (vcpu->arch.hflags & BOOK3S_HFLAG_NATIVE_PS) {
 408                                 /* Native paired singles */
 409                         } else if (spr_val & (1 << 29)) { /* HID2.PSE */
 410                                 vcpu->arch.hflags |= BOOK3S_HFLAG_PAIRED_SINGLE;
 411                                 kvmppc_giveup_ext(vcpu, MSR_FP);
 412                         } else {
 413                                 vcpu->arch.hflags &= ~BOOK3S_HFLAG_PAIRED_SINGLE;
 414                         }
 415                         break;
 416                 }
 417                 break;
 418         case SPRN_HID4:
 419         case SPRN_HID4_GEKKO:
 420                 to_book3s(vcpu)->hid[4] = spr_val;
 421                 break;
 422         case SPRN_HID5:
 423                 to_book3s(vcpu)->hid[5] = spr_val;
 424                 /* guest HID5 set can change is_dcbz32 */
 425                 if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
 426                     (mfmsr() & MSR_HV))
 427                         vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32;
 428                 break;
 429         case SPRN_PURR:
 430                 to_book3s(vcpu)->purr_offset = spr_val - get_tb();
 431                 break;
 432         case SPRN_SPURR:
 433                 to_book3s(vcpu)->spurr_offset = spr_val - get_tb();
 434                 break;
 435         case SPRN_GQR0:
 436         case SPRN_GQR1:
 437         case SPRN_GQR2:
 438         case SPRN_GQR3:
 439         case SPRN_GQR4:
 440         case SPRN_GQR5:
 441         case SPRN_GQR6:
 442         case SPRN_GQR7:
 443                 to_book3s(vcpu)->gqr[sprn - SPRN_GQR0] = spr_val;
 444                 break;
 445         case SPRN_ICTC:
 446         case SPRN_THRM1:
 447         case SPRN_THRM2:
 448         case SPRN_THRM3:
 449         case SPRN_CTRLF:
 450         case SPRN_CTRLT:
 451         case SPRN_L2CR:
 452         case SPRN_DSCR:
 453         case SPRN_MMCR0_GEKKO:
 454         case SPRN_MMCR1_GEKKO:
 455         case SPRN_PMC1_GEKKO:
 456         case SPRN_PMC2_GEKKO:
 457         case SPRN_PMC3_GEKKO:
 458         case SPRN_PMC4_GEKKO:
 459         case SPRN_WPAR_GEKKO:
 460         case SPRN_MSSSR0:
 461                 break;
 462 unprivileged:
 463         default:
 464                 printk(KERN_INFO "KVM: invalid SPR write: %d\n", sprn);
 465 #ifndef DEBUG_SPR
 466                 emulated = EMULATE_FAIL;
 467 #endif
 468                 break;
 469         }
 470
 471         return emulated;
 472 }
 473
 474 int kvmppc_core_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, ulong *spr_val)
 475 {
 476         int emulated = EMULATE_DONE;
 477
 478         switch (sprn) {
 479         case SPRN_IBAT0U ... SPRN_IBAT3L:
 480         case SPRN_IBAT4U ... SPRN_IBAT7L:
 481         case SPRN_DBAT0U ... SPRN_DBAT3L:
 482         case SPRN_DBAT4U ... SPRN_DBAT7L:
 483         {
 484                 struct kvmppc_bat *bat = kvmppc_find_bat(vcpu, sprn);
 485
 486                 if (sprn % 2)
 487                         *spr_val = bat->raw >> 32;
 488                 else
 489                         *spr_val = bat->raw;
 490
 491                 break;
 492         }
 493         case SPRN_SDR1:
 494                 if (!spr_allowed(vcpu, PRIV_HYPER))
 495                         goto unprivileged;
 496                 *spr_val = to_book3s(vcpu)->sdr1;
 497                 break;
 498         case SPRN_DSISR:
 499                 *spr_val = vcpu->arch.shared->dsisr;
 500                 break;
 501         case SPRN_DAR:
 502                 *spr_val = vcpu->arch.shared->dar;
 503                 break;
 504         case SPRN_HIOR:
 505                 *spr_val = to_book3s(vcpu)->hior;
 506                 break;
 507         case SPRN_HID0:
 508                 *spr_val = to_book3s(vcpu)->hid[0];
 509                 break;
 510         case SPRN_HID1:
 511                 *spr_val = to_book3s(vcpu)->hid[1];
 512                 break;
 513         case SPRN_HID2:
 514         case SPRN_HID2_GEKKO:
 515                 *spr_val = to_book3s(vcpu)->hid[2];
 516                 break;
 517         case SPRN_HID4:
 518         case SPRN_HID4_GEKKO:
 519                 *spr_val = to_book3s(vcpu)->hid[4];
 520                 break;
 521         case SPRN_HID5:
 522                 *spr_val = to_book3s(vcpu)->hid[5];
 523                 break;
 524         case SPRN_CFAR:
 525         case SPRN_DSCR:
 526                 *spr_val = 0;
 527                 break;
 528         case SPRN_PURR:
 529                 *spr_val = get_tb() + to_book3s(vcpu)->purr_offset;
 530                 break;
 531         case SPRN_SPURR:
 532                 *spr_val = get_tb() + to_book3s(vcpu)->purr_offset;
 533                 break;
 534         case SPRN_GQR0:
 535         case SPRN_GQR1:
 536         case SPRN_GQR2:
 537         case SPRN_GQR3:
 538         case SPRN_GQR4:
 539         case SPRN_GQR5:
 540         case SPRN_GQR6:
 541         case SPRN_GQR7:
 542                 *spr_val = to_book3s(vcpu)->gqr[sprn - SPRN_GQR0];
 543                 break;
 544         case SPRN_THRM1:
 545         case SPRN_THRM2:
 546         case SPRN_THRM3:
 547         case SPRN_CTRLF:
 548         case SPRN_CTRLT:
 549         case SPRN_L2CR:
 550         case SPRN_MMCR0_GEKKO:
 551         case SPRN_MMCR1_GEKKO:
 552         case SPRN_PMC1_GEKKO:
 553         case SPRN_PMC2_GEKKO:
 554         case SPRN_PMC3_GEKKO:
 555         case SPRN_PMC4_GEKKO:
 556         case SPRN_WPAR_GEKKO:
 557         case SPRN_MSSSR0:
 558                 *spr_val = 0;
 559                 break;
 560         default:
 561 unprivileged:
 562                 printk(KERN_INFO "KVM: invalid SPR read: %d\n", sprn);
 563 #ifndef DEBUG_SPR
 564                 emulated = EMULATE_FAIL;
 565 #endif
 566                 break;
 567         }
 568
 569         return emulated;
 570 }
 571
 572 u32 kvmppc_alignment_dsisr(struct kvm_vcpu *vcpu, unsigned int inst)
 573 {
 574         u32 dsisr = 0;
 575
 576         /*
 577          * This is what the spec says about DSISR bits (not mentioned = 0):
 578          *
 579          * 12:13                [DS]    Set to bits 30:31
 580          * 15:16                [X]     Set to bits 29:30
 581          * 17                   [X]     Set to bit 25
 582          *                      [D/DS]  Set to bit 5
 583          * 18:21                [X]     Set to bits 21:24
 584          *                      [D/DS]  Set to bits 1:4
 585          * 22:26                        Set to bits 6:10 (RT/RS/FRT/FRS)
 586          * 27:31                        Set to bits 11:15 (RA)
 587          */
 588
 589         switch (get_op(inst)) {
 590         /* D-form */
 591         case OP_LFS:
 592         case OP_LFD:
 593         case OP_STFD:
 594         case OP_STFS:
 595                 dsisr |= (inst >> 12) & 0x4000; /* bit 17 */
 596                 dsisr |= (inst >> 17) & 0x3c00; /* bits 18:21 */
 597                 break;
 598         /* X-form */
 599         case 31:
 600                 dsisr |= (inst << 14) & 0x18000; /* bits 15:16 */
 601                 dsisr |= (inst << 8)  & 0x04000; /* bit 17 */
 602                 dsisr |= (inst << 3)  & 0x03c00; /* bits 18:21 */
 603                 break;
 604         default:
 605                 printk(KERN_INFO "KVM: Unaligned instruction 0x%x\n", inst);
 606                 break;
 607         }
 608
 609         dsisr |= (inst >> 16) & 0x03ff; /* bits 22:31 */
 610
 611         return dsisr;
 612 }
 613
 614 ulong kvmppc_alignment_dar(struct kvm_vcpu *vcpu, unsigned int inst)
 615 {
 616         ulong dar = 0;
 617         ulong ra = get_ra(inst);
 618         ulong rb = get_rb(inst);
 619
 620         switch (get_op(inst)) {
 621         case OP_LFS:
 622         case OP_LFD:
 623         case OP_STFD:
 624         case OP_STFS:
 625                 if (ra)
 626                         dar = kvmppc_get_gpr(vcpu, ra);
 627                 dar += (s32)((s16)inst);
 628                 break;
 629         case 31:
 630                 if (ra)
 631                         dar = kvmppc_get_gpr(vcpu, ra);
 632                 dar += kvmppc_get_gpr(vcpu, rb);
 633                 break;
 634         default:
 635                 printk(KERN_INFO "KVM: Unaligned instruction 0x%x\n", inst);
 636                 break;
 637         }
 638
 639         return dar;
 640 }