arch/powerpc/kvm/booke_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 IBM Corp. 2008
  16  * Copyright 2011 Freescale Semiconductor, Inc.
  17  *
  18  * Authors: Hollis Blanchard <hollisb@us.ibm.com>
  19  */
  20
  21 #include <linux/kvm_host.h>
  22 #include <asm/disassemble.h>
  23
  24 #include "booke.h"
  25
  26 #define OP_19_XOP_RFI     50
  27 #define OP_19_XOP_RFCI    51
  28
  29 #define OP_31_XOP_MFMSR   83
  30 #define OP_31_XOP_WRTEE   131
  31 #define OP_31_XOP_MTMSR   146
  32 #define OP_31_XOP_WRTEEI  163
  33
  34 static void kvmppc_emul_rfi(struct kvm_vcpu *vcpu)
  35 {
  36         vcpu->arch.pc = vcpu->arch.shared->srr0;
  37         kvmppc_set_msr(vcpu, vcpu->arch.shared->srr1);
  38 }
  39
  40 static void kvmppc_emul_rfci(struct kvm_vcpu *vcpu)
  41 {
  42         vcpu->arch.pc = vcpu->arch.csrr0;
  43         kvmppc_set_msr(vcpu, vcpu->arch.csrr1);
  44 }
  45
  46 int kvmppc_booke_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu,
  47                             unsigned int inst, int *advance)
  48 {
  49         int emulated = EMULATE_DONE;
  50         int rs = get_rs(inst);
  51         int rt = get_rt(inst);
  52
  53         switch (get_op(inst)) {
  54         case 19:
  55                 switch (get_xop(inst)) {
  56                 case OP_19_XOP_RFI:
  57                         kvmppc_emul_rfi(vcpu);
  58                         kvmppc_set_exit_type(vcpu, EMULATED_RFI_EXITS);
  59                         *advance = 0;
  60                         break;
  61
  62                 case OP_19_XOP_RFCI:
  63                         kvmppc_emul_rfci(vcpu);
  64                         kvmppc_set_exit_type(vcpu, EMULATED_RFCI_EXITS);
  65                         *advance = 0;
  66                         break;
  67
  68                 default:
  69                         emulated = EMULATE_FAIL;
  70                         break;
  71                 }
  72                 break;
  73
  74         case 31:
  75                 switch (get_xop(inst)) {
  76
  77                 case OP_31_XOP_MFMSR:
  78                         kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->msr);
  79                         kvmppc_set_exit_type(vcpu, EMULATED_MFMSR_EXITS);
  80                         break;
  81
  82                 case OP_31_XOP_MTMSR:
  83                         kvmppc_set_exit_type(vcpu, EMULATED_MTMSR_EXITS);
  84                         kvmppc_set_msr(vcpu, kvmppc_get_gpr(vcpu, rs));
  85                         break;
  86
  87                 case OP_31_XOP_WRTEE:
  88                         vcpu->arch.shared->msr = (vcpu->arch.shared->msr & ~MSR_EE)
  89                                         | (kvmppc_get_gpr(vcpu, rs) & MSR_EE);
  90                         kvmppc_set_exit_type(vcpu, EMULATED_WRTEE_EXITS);
  91                         break;
  92
  93                 case OP_31_XOP_WRTEEI:
  94                         vcpu->arch.shared->msr = (vcpu->arch.shared->msr & ~MSR_EE)
  95                                                          | (inst & MSR_EE);
  96                         kvmppc_set_exit_type(vcpu, EMULATED_WRTEE_EXITS);
  97                         break;
  98
  99                 default:
 100                         emulated = EMULATE_FAIL;
 101                 }
 102
 103                 break;
 104
 105         default:
 106                 emulated = EMULATE_FAIL;
 107         }
 108
 109         return emulated;
 110 }
 111
 112 /*
 113  * NOTE: some of these registers are not emulated on BOOKE_HV (GS-mode).
 114  * Their backing store is in real registers, and these functions
 115  * will return the wrong result if called for them in another context
 116  * (such as debugging).
 117  */
 118 int kvmppc_booke_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, ulong spr_val)
 119 {
 120         int emulated = EMULATE_DONE;
 121
 122         switch (sprn) {
 123         case SPRN_DEAR:
 124                 vcpu->arch.shared->dar = spr_val;
 125                 break;
 126         case SPRN_ESR:
 127                 vcpu->arch.shared->esr = spr_val;
 128                 break;
 129         case SPRN_CSRR0:
 130                 vcpu->arch.csrr0 = spr_val;
 131                 break;
 132         case SPRN_CSRR1:
 133                 vcpu->arch.csrr1 = spr_val;
 134                 break;
 135         case SPRN_DBCR0:
 136                 vcpu->arch.dbg_reg.dbcr0 = spr_val;
 137                 break;
 138         case SPRN_DBCR1:
 139                 vcpu->arch.dbg_reg.dbcr1 = spr_val;
 140                 break;
 141         case SPRN_DBSR:
 142                 vcpu->arch.dbsr &= ~spr_val;
 143                 break;
 144         case SPRN_TSR:
 145                 kvmppc_clr_tsr_bits(vcpu, spr_val);
 146                 break;
 147         case SPRN_TCR:
 148                 /*
 149                  * WRC is a 2-bit field that is supposed to preserve its
 150                  * value once written to non-zero.
 151                  */
 152                 if (vcpu->arch.tcr & TCR_WRC_MASK) {
 153                         spr_val &= ~TCR_WRC_MASK;
 154                         spr_val |= vcpu->arch.tcr & TCR_WRC_MASK;
 155                 }
 156                 kvmppc_set_tcr(vcpu, spr_val);
 157                 break;
 158
 159         case SPRN_DECAR:
 160                 vcpu->arch.decar = spr_val;
 161                 break;
 162         /*
 163          * Note: SPRG4-7 are user-readable.
 164          * These values are loaded into the real SPRGs when resuming the
 165          * guest (PR-mode only).
 166          */
 167         case SPRN_SPRG4:
 168                 kvmppc_set_sprg4(vcpu, spr_val);
 169                 break;
 170         case SPRN_SPRG5:
 171                 kvmppc_set_sprg5(vcpu, spr_val);
 172                 break;
 173         case SPRN_SPRG6:
 174                 kvmppc_set_sprg6(vcpu, spr_val);
 175                 break;
 176         case SPRN_SPRG7:
 177                 kvmppc_set_sprg7(vcpu, spr_val);
 178                 break;
 179
 180         case SPRN_IVPR:
 181                 vcpu->arch.ivpr = spr_val;
 182 #ifdef CONFIG_KVM_BOOKE_HV
 183                 mtspr(SPRN_GIVPR, spr_val);
 184 #endif
 185                 break;
 186         case SPRN_IVOR0:
 187                 vcpu->arch.ivor[BOOKE_IRQPRIO_CRITICAL] = spr_val;
 188                 break;
 189         case SPRN_IVOR1:
 190                 vcpu->arch.ivor[BOOKE_IRQPRIO_MACHINE_CHECK] = spr_val;
 191                 break;
 192         case SPRN_IVOR2:
 193                 vcpu->arch.ivor[BOOKE_IRQPRIO_DATA_STORAGE] = spr_val;
 194 #ifdef CONFIG_KVM_BOOKE_HV
 195                 mtspr(SPRN_GIVOR2, spr_val);
 196 #endif
 197                 break;
 198         case SPRN_IVOR3:
 199                 vcpu->arch.ivor[BOOKE_IRQPRIO_INST_STORAGE] = spr_val;
 200                 break;
 201         case SPRN_IVOR4:
 202                 vcpu->arch.ivor[BOOKE_IRQPRIO_EXTERNAL] = spr_val;
 203                 break;
 204         case SPRN_IVOR5:
 205                 vcpu->arch.ivor[BOOKE_IRQPRIO_ALIGNMENT] = spr_val;
 206                 break;
 207         case SPRN_IVOR6:
 208                 vcpu->arch.ivor[BOOKE_IRQPRIO_PROGRAM] = spr_val;
 209                 break;
 210         case SPRN_IVOR7:
 211                 vcpu->arch.ivor[BOOKE_IRQPRIO_FP_UNAVAIL] = spr_val;
 212                 break;
 213         case SPRN_IVOR8:
 214                 vcpu->arch.ivor[BOOKE_IRQPRIO_SYSCALL] = spr_val;
 215 #ifdef CONFIG_KVM_BOOKE_HV
 216                 mtspr(SPRN_GIVOR8, spr_val);
 217 #endif
 218                 break;
 219         case SPRN_IVOR9:
 220                 vcpu->arch.ivor[BOOKE_IRQPRIO_AP_UNAVAIL] = spr_val;
 221                 break;
 222         case SPRN_IVOR10:
 223                 vcpu->arch.ivor[BOOKE_IRQPRIO_DECREMENTER] = spr_val;
 224                 break;
 225         case SPRN_IVOR11:
 226                 vcpu->arch.ivor[BOOKE_IRQPRIO_FIT] = spr_val;
 227                 break;
 228         case SPRN_IVOR12:
 229                 vcpu->arch.ivor[BOOKE_IRQPRIO_WATCHDOG] = spr_val;
 230                 break;
 231         case SPRN_IVOR13:
 232                 vcpu->arch.ivor[BOOKE_IRQPRIO_DTLB_MISS] = spr_val;
 233                 break;
 234         case SPRN_IVOR14:
 235                 vcpu->arch.ivor[BOOKE_IRQPRIO_ITLB_MISS] = spr_val;
 236                 break;
 237         case SPRN_IVOR15:
 238                 vcpu->arch.ivor[BOOKE_IRQPRIO_DEBUG] = spr_val;
 239                 break;
 240         case SPRN_MCSR:
 241                 vcpu->arch.mcsr &= ~spr_val;
 242                 break;
 243 #if defined(CONFIG_64BIT)
 244         case SPRN_EPCR:
 245                 kvmppc_set_epcr(vcpu, spr_val);
 246 #ifdef CONFIG_KVM_BOOKE_HV
 247                 mtspr(SPRN_EPCR, vcpu->arch.shadow_epcr);
 248 #endif
 249                 break;
 250 #endif
 251         default:
 252                 emulated = EMULATE_FAIL;
 253         }
 254
 255         return emulated;
 256 }
 257
 258 int kvmppc_booke_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, ulong *spr_val)
 259 {
 260         int emulated = EMULATE_DONE;
 261
 262         switch (sprn) {
 263         case SPRN_IVPR:
 264                 *spr_val = vcpu->arch.ivpr;
 265                 break;
 266         case SPRN_DEAR:
 267                 *spr_val = vcpu->arch.shared->dar;
 268                 break;
 269         case SPRN_ESR:
 270                 *spr_val = vcpu->arch.shared->esr;
 271                 break;
 272         case SPRN_EPR:
 273                 *spr_val = vcpu->arch.epr;
 274                 break;
 275         case SPRN_CSRR0:
 276                 *spr_val = vcpu->arch.csrr0;
 277                 break;
 278         case SPRN_CSRR1:
 279                 *spr_val = vcpu->arch.csrr1;
 280                 break;
 281         case SPRN_DBCR0:
 282                 *spr_val = vcpu->arch.dbg_reg.dbcr0;
 283                 break;
 284         case SPRN_DBCR1:
 285                 *spr_val = vcpu->arch.dbg_reg.dbcr1;
 286                 break;
 287         case SPRN_DBSR:
 288                 *spr_val = vcpu->arch.dbsr;
 289                 break;
 290         case SPRN_TSR:
 291                 *spr_val = vcpu->arch.tsr;
 292                 break;
 293         case SPRN_TCR:
 294                 *spr_val = vcpu->arch.tcr;
 295                 break;
 296
 297         case SPRN_IVOR0:
 298                 *spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_CRITICAL];
 299                 break;
 300         case SPRN_IVOR1:
 301                 *spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_MACHINE_CHECK];
 302                 break;
 303         case SPRN_IVOR2:
 304                 *spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_DATA_STORAGE];
 305                 break;
 306         case SPRN_IVOR3:
 307                 *spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_INST_STORAGE];
 308                 break;
 309         case SPRN_IVOR4:
 310                 *spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_EXTERNAL];
 311                 break;
 312         case SPRN_IVOR5:
 313                 *spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_ALIGNMENT];
 314                 break;
 315         case SPRN_IVOR6:
 316                 *spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_PROGRAM];
 317                 break;
 318         case SPRN_IVOR7:
 319                 *spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_FP_UNAVAIL];
 320                 break;
 321         case SPRN_IVOR8:
 322                 *spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_SYSCALL];
 323                 break;
 324         case SPRN_IVOR9:
 325                 *spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_AP_UNAVAIL];
 326                 break;
 327         case SPRN_IVOR10:
 328                 *spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_DECREMENTER];
 329                 break;
 330         case SPRN_IVOR11:
 331                 *spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_FIT];
 332                 break;
 333         case SPRN_IVOR12:
 334                 *spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_WATCHDOG];
 335                 break;
 336         case SPRN_IVOR13:
 337                 *spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_DTLB_MISS];
 338                 break;
 339         case SPRN_IVOR14:
 340                 *spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_ITLB_MISS];
 341                 break;
 342         case SPRN_IVOR15:
 343                 *spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_DEBUG];
 344                 break;
 345         case SPRN_MCSR:
 346                 *spr_val = vcpu->arch.mcsr;
 347                 break;
 348 #if defined(CONFIG_64BIT)
 349         case SPRN_EPCR:
 350                 *spr_val = vcpu->arch.epcr;
 351                 break;
 352 #endif
 353
 354         default:
 355                 emulated = EMULATE_FAIL;
 356         }
 357
 358         return emulated;
 359 }