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   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. 2007
  16  *
  17  * Authors: Hollis Blanchard <hollisb@us.ibm.com>
  18  *          Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
  19  */
  20
  21 #include <linux/errno.h>
  22 #include <linux/err.h>
  23 #include <linux/kvm_host.h>
  24 #include <linux/module.h>
  25 #include <linux/vmalloc.h>
  26 #include <linux/fs.h>
  27 #include <asm/cputable.h>
  28 #include <asm/uaccess.h>
  29 #include <asm/kvm_ppc.h>
  30
  31
  32 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
  33 {
  34         return gfn;
  35 }
  36
  37 int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
  38 {
  39         return !!(v->arch.pending_exceptions);
  40 }
  41
  42 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
  43 {
  44         return !(v->arch.msr & MSR_WE);
  45 }
  46
  47
  48 int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu)
  49 {
  50         enum emulation_result er;
  51         int r;
  52
  53         er = kvmppc_emulate_instruction(run, vcpu);
  54         switch (er) {
  55         case EMULATE_DONE:
  56                 /* Future optimization: only reload non-volatiles if they were
  57                  * actually modified. */
  58                 r = RESUME_GUEST_NV;
  59                 break;
  60         case EMULATE_DO_MMIO:
  61                 run->exit_reason = KVM_EXIT_MMIO;
  62                 /* We must reload nonvolatiles because "update" load/store
  63                  * instructions modify register state. */
  64                 /* Future optimization: only reload non-volatiles if they were
  65                  * actually modified. */
  66                 r = RESUME_HOST_NV;
  67                 break;
  68         case EMULATE_FAIL:
  69                 /* XXX Deliver Program interrupt to guest. */
  70                 printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__,
  71                        vcpu->arch.last_inst);
  72                 r = RESUME_HOST;
  73                 break;
  74         default:
  75                 BUG();
  76         }
  77
  78         return r;
  79 }
  80
  81 void kvm_arch_hardware_enable(void *garbage)
  82 {
  83 }
  84
  85 void kvm_arch_hardware_disable(void *garbage)
  86 {
  87 }
  88
  89 int kvm_arch_hardware_setup(void)
  90 {
  91         return 0;
  92 }
  93
  94 void kvm_arch_hardware_unsetup(void)
  95 {
  96 }
  97
  98 void kvm_arch_check_processor_compat(void *rtn)
  99 {
 100         int r;
 101
 102         if (strcmp(cur_cpu_spec->platform, "ppc440") == 0)
 103                 r = 0;
 104         else
 105                 r = -ENOTSUPP;
 106
 107         *(int *)rtn = r;
 108 }
 109
 110 struct kvm *kvm_arch_create_vm(void)
 111 {
 112         struct kvm *kvm;
 113
 114         kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
 115         if (!kvm)
 116                 return ERR_PTR(-ENOMEM);
 117
 118         return kvm;
 119 }
 120
 121 static void kvmppc_free_vcpus(struct kvm *kvm)
 122 {
 123         unsigned int i;
 124
 125         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 126                 if (kvm->vcpus[i]) {
 127                         kvm_arch_vcpu_free(kvm->vcpus[i]);
 128                         kvm->vcpus[i] = NULL;
 129                 }
 130         }
 131 }
 132
 133 void kvm_arch_destroy_vm(struct kvm *kvm)
 134 {
 135         kvmppc_free_vcpus(kvm);
 136         kvm_free_physmem(kvm);
 137         kfree(kvm);
 138 }
 139
 140 int kvm_dev_ioctl_check_extension(long ext)
 141 {
 142         int r;
 143
 144         switch (ext) {
 145         case KVM_CAP_USER_MEMORY:
 146                 r = 1;
 147                 break;
 148         case KVM_CAP_COALESCED_MMIO:
 149                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 150                 break;
 151         default:
 152                 r = 0;
 153                 break;
 154         }
 155         return r;
 156
 157 }
 158
 159 long kvm_arch_dev_ioctl(struct file *filp,
 160                         unsigned int ioctl, unsigned long arg)
 161 {
 162         return -EINVAL;
 163 }
 164
 165 int kvm_arch_set_memory_region(struct kvm *kvm,
 166                                struct kvm_userspace_memory_region *mem,
 167                                struct kvm_memory_slot old,
 168                                int user_alloc)
 169 {
 170         return 0;
 171 }
 172
 173 void kvm_arch_flush_shadow(struct kvm *kvm)
 174 {
 175 }
 176
 177 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 178 {
 179         struct kvm_vcpu *vcpu;
 180         int err;
 181
 182         vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
 183         if (!vcpu) {
 184                 err = -ENOMEM;
 185                 goto out;
 186         }
 187
 188         err = kvm_vcpu_init(vcpu, kvm, id);
 189         if (err)
 190                 goto free_vcpu;
 191
 192         return vcpu;
 193
 194 free_vcpu:
 195         kmem_cache_free(kvm_vcpu_cache, vcpu);
 196 out:
 197         return ERR_PTR(err);
 198 }
 199
 200 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 201 {
 202         kvm_vcpu_uninit(vcpu);
 203         kmem_cache_free(kvm_vcpu_cache, vcpu);
 204 }
 205
 206 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 207 {
 208         kvm_arch_vcpu_free(vcpu);
 209 }
 210
 211 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 212 {
 213         unsigned int priority = exception_priority[BOOKE_INTERRUPT_DECREMENTER];
 214
 215         return test_bit(priority, &vcpu->arch.pending_exceptions);
 216 }
 217
 218 static void kvmppc_decrementer_func(unsigned long data)
 219 {
 220         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
 221
 222         kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_DECREMENTER);
 223
 224         if (waitqueue_active(&vcpu->wq)) {
 225                 wake_up_interruptible(&vcpu->wq);
 226                 vcpu->stat.halt_wakeup++;
 227         }
 228 }
 229
 230 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 231 {
 232         setup_timer(&vcpu->arch.dec_timer, kvmppc_decrementer_func,
 233                     (unsigned long)vcpu);
 234
 235         return 0;
 236 }
 237
 238 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 239 {
 240 }
 241
 242 /* Note: clearing MSR[DE] just means that the debug interrupt will not be
 243  * delivered *immediately*. Instead, it simply sets the appropriate DBSR bits.
 244  * If those DBSR bits are still set when MSR[DE] is re-enabled, the interrupt
 245  * will be delivered as an "imprecise debug event" (which is indicated by
 246  * DBSR[IDE].
 247  */
 248 static void kvmppc_disable_debug_interrupts(void)
 249 {
 250         mtmsr(mfmsr() & ~MSR_DE);
 251 }
 252
 253 static void kvmppc_restore_host_debug_state(struct kvm_vcpu *vcpu)
 254 {
 255         kvmppc_disable_debug_interrupts();
 256
 257         mtspr(SPRN_IAC1, vcpu->arch.host_iac[0]);
 258         mtspr(SPRN_IAC2, vcpu->arch.host_iac[1]);
 259         mtspr(SPRN_IAC3, vcpu->arch.host_iac[2]);
 260         mtspr(SPRN_IAC4, vcpu->arch.host_iac[3]);
 261         mtspr(SPRN_DBCR1, vcpu->arch.host_dbcr1);
 262         mtspr(SPRN_DBCR2, vcpu->arch.host_dbcr2);
 263         mtspr(SPRN_DBCR0, vcpu->arch.host_dbcr0);
 264         mtmsr(vcpu->arch.host_msr);
 265 }
 266
 267 static void kvmppc_load_guest_debug_registers(struct kvm_vcpu *vcpu)
 268 {
 269         struct kvm_guest_debug *dbg = &vcpu->guest_debug;
 270         u32 dbcr0 = 0;
 271
 272         vcpu->arch.host_msr = mfmsr();
 273         kvmppc_disable_debug_interrupts();
 274
 275         /* Save host debug register state. */
 276         vcpu->arch.host_iac[0] = mfspr(SPRN_IAC1);
 277         vcpu->arch.host_iac[1] = mfspr(SPRN_IAC2);
 278         vcpu->arch.host_iac[2] = mfspr(SPRN_IAC3);
 279         vcpu->arch.host_iac[3] = mfspr(SPRN_IAC4);
 280         vcpu->arch.host_dbcr0 = mfspr(SPRN_DBCR0);
 281         vcpu->arch.host_dbcr1 = mfspr(SPRN_DBCR1);
 282         vcpu->arch.host_dbcr2 = mfspr(SPRN_DBCR2);
 283
 284         /* set registers up for guest */
 285
 286         if (dbg->bp[0]) {
 287                 mtspr(SPRN_IAC1, dbg->bp[0]);
 288                 dbcr0 |= DBCR0_IAC1 | DBCR0_IDM;
 289         }
 290         if (dbg->bp[1]) {
 291                 mtspr(SPRN_IAC2, dbg->bp[1]);
 292                 dbcr0 |= DBCR0_IAC2 | DBCR0_IDM;
 293         }
 294         if (dbg->bp[2]) {
 295                 mtspr(SPRN_IAC3, dbg->bp[2]);
 296                 dbcr0 |= DBCR0_IAC3 | DBCR0_IDM;
 297         }
 298         if (dbg->bp[3]) {
 299                 mtspr(SPRN_IAC4, dbg->bp[3]);
 300                 dbcr0 |= DBCR0_IAC4 | DBCR0_IDM;
 301         }
 302
 303         mtspr(SPRN_DBCR0, dbcr0);
 304         mtspr(SPRN_DBCR1, 0);
 305         mtspr(SPRN_DBCR2, 0);
 306 }
 307
 308 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 309 {
 310         if (vcpu->guest_debug.enabled)
 311                 kvmppc_load_guest_debug_registers(vcpu);
 312 }
 313
 314 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 315 {
 316         if (vcpu->guest_debug.enabled)
 317                 kvmppc_restore_host_debug_state(vcpu);
 318 }
 319
 320 int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
 321                                     struct kvm_debug_guest *dbg)
 322 {
 323         int i;
 324
 325         vcpu->guest_debug.enabled = dbg->enabled;
 326         if (vcpu->guest_debug.enabled) {
 327                 for (i=0; i < ARRAY_SIZE(vcpu->guest_debug.bp); i++) {
 328                         if (dbg->breakpoints[i].enabled)
 329                                 vcpu->guest_debug.bp[i] = dbg->breakpoints[i].address;
 330                         else
 331                                 vcpu->guest_debug.bp[i] = 0;
 332                 }
 333         }
 334
 335         return 0;
 336 }
 337
 338 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
 339                                      struct kvm_run *run)
 340 {
 341         u32 *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
 342         *gpr = run->dcr.data;
 343 }
 344
 345 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
 346                                       struct kvm_run *run)
 347 {
 348         u32 *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
 349
 350         if (run->mmio.len > sizeof(*gpr)) {
 351                 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
 352                 return;
 353         }
 354
 355         if (vcpu->arch.mmio_is_bigendian) {
 356                 switch (run->mmio.len) {
 357                 case 4: *gpr = *(u32 *)run->mmio.data; break;
 358                 case 2: *gpr = *(u16 *)run->mmio.data; break;
 359                 case 1: *gpr = *(u8 *)run->mmio.data; break;
 360                 }
 361         } else {
 362                 /* Convert BE data from userland back to LE. */
 363                 switch (run->mmio.len) {
 364                 case 4: *gpr = ld_le32((u32 *)run->mmio.data); break;
 365                 case 2: *gpr = ld_le16((u16 *)run->mmio.data); break;
 366                 case 1: *gpr = *(u8 *)run->mmio.data; break;
 367                 }
 368         }
 369 }
 370
 371 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
 372                        unsigned int rt, unsigned int bytes, int is_bigendian)
 373 {
 374         if (bytes > sizeof(run->mmio.data)) {
 375                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 376                        run->mmio.len);
 377         }
 378
 379         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 380         run->mmio.len = bytes;
 381         run->mmio.is_write = 0;
 382
 383         vcpu->arch.io_gpr = rt;
 384         vcpu->arch.mmio_is_bigendian = is_bigendian;
 385         vcpu->mmio_needed = 1;
 386         vcpu->mmio_is_write = 0;
 387
 388         return EMULATE_DO_MMIO;
 389 }
 390
 391 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
 392                         u32 val, unsigned int bytes, int is_bigendian)
 393 {
 394         void *data = run->mmio.data;
 395
 396         if (bytes > sizeof(run->mmio.data)) {
 397                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 398                        run->mmio.len);
 399         }
 400
 401         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 402         run->mmio.len = bytes;
 403         run->mmio.is_write = 1;
 404         vcpu->mmio_needed = 1;
 405         vcpu->mmio_is_write = 1;
 406
 407         /* Store the value at the lowest bytes in 'data'. */
 408         if (is_bigendian) {
 409                 switch (bytes) {
 410                 case 4: *(u32 *)data = val; break;
 411                 case 2: *(u16 *)data = val; break;
 412                 case 1: *(u8  *)data = val; break;
 413                 }
 414         } else {
 415                 /* Store LE value into 'data'. */
 416                 switch (bytes) {
 417                 case 4: st_le32(data, val); break;
 418                 case 2: st_le16(data, val); break;
 419                 case 1: *(u8 *)data = val; break;
 420                 }
 421         }
 422
 423         return EMULATE_DO_MMIO;
 424 }
 425
 426 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 427 {
 428         int r;
 429         sigset_t sigsaved;
 430
 431         vcpu_load(vcpu);
 432
 433         if (vcpu->sigset_active)
 434                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 435
 436         if (vcpu->mmio_needed) {
 437                 if (!vcpu->mmio_is_write)
 438                         kvmppc_complete_mmio_load(vcpu, run);
 439                 vcpu->mmio_needed = 0;
 440         } else if (vcpu->arch.dcr_needed) {
 441                 if (!vcpu->arch.dcr_is_write)
 442                         kvmppc_complete_dcr_load(vcpu, run);
 443                 vcpu->arch.dcr_needed = 0;
 444         }
 445
 446         kvmppc_check_and_deliver_interrupts(vcpu);
 447
 448         local_irq_disable();
 449         kvm_guest_enter();
 450         r = __kvmppc_vcpu_run(run, vcpu);
 451         kvm_guest_exit();
 452         local_irq_enable();
 453
 454         if (vcpu->sigset_active)
 455                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 456
 457         vcpu_put(vcpu);
 458
 459         return r;
 460 }
 461
 462 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
 463 {
 464         kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_EXTERNAL);
 465
 466         if (waitqueue_active(&vcpu->wq)) {
 467                 wake_up_interruptible(&vcpu->wq);
 468                 vcpu->stat.halt_wakeup++;
 469         }
 470
 471         return 0;
 472 }
 473
 474 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 475                                     struct kvm_mp_state *mp_state)
 476 {
 477         return -EINVAL;
 478 }
 479
 480 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 481                                     struct kvm_mp_state *mp_state)
 482 {
 483         return -EINVAL;
 484 }
 485
 486 long kvm_arch_vcpu_ioctl(struct file *filp,
 487                          unsigned int ioctl, unsigned long arg)
 488 {
 489         struct kvm_vcpu *vcpu = filp->private_data;
 490         void __user *argp = (void __user *)arg;
 491         long r;
 492
 493         switch (ioctl) {
 494         case KVM_INTERRUPT: {
 495                 struct kvm_interrupt irq;
 496                 r = -EFAULT;
 497                 if (copy_from_user(&irq, argp, sizeof(irq)))
 498                         goto out;
 499                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 500                 break;
 501         }
 502         default:
 503                 r = -EINVAL;
 504         }
 505
 506 out:
 507         return r;
 508 }
 509
 510 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
 511 {
 512         return -ENOTSUPP;
 513 }
 514
 515 long kvm_arch_vm_ioctl(struct file *filp,
 516                        unsigned int ioctl, unsigned long arg)
 517 {
 518         long r;
 519
 520         switch (ioctl) {
 521         default:
 522                 r = -EINVAL;
 523         }
 524
 525         return r;
 526 }
 527
 528 int kvm_arch_init(void *opaque)
 529 {
 530         return 0;
 531 }
 532
 533 void kvm_arch_exit(void)
 534 {
 535 }