arch/powerpc/kvm/powerpc.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. 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 #include <asm/tlbflush.h>
  31
  32
  33 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
  34 {
  35         return gfn;
  36 }
  37
  38 int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
  39 {
  40         return !!(v->arch.pending_exceptions);
  41 }
  42
  43 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
  44 {
  45         return !(v->arch.msr & MSR_WE);
  46 }
  47
  48
  49 int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu)
  50 {
  51         enum emulation_result er;
  52         int r;
  53
  54         er = kvmppc_emulate_instruction(run, vcpu);
  55         switch (er) {
  56         case EMULATE_DONE:
  57                 /* Future optimization: only reload non-volatiles if they were
  58                  * actually modified. */
  59                 r = RESUME_GUEST_NV;
  60                 break;
  61         case EMULATE_DO_MMIO:
  62                 run->exit_reason = KVM_EXIT_MMIO;
  63                 /* We must reload nonvolatiles because "update" load/store
  64                  * instructions modify register state. */
  65                 /* Future optimization: only reload non-volatiles if they were
  66                  * actually modified. */
  67                 r = RESUME_HOST_NV;
  68                 break;
  69         case EMULATE_FAIL:
  70                 /* XXX Deliver Program interrupt to guest. */
  71                 printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__,
  72                        vcpu->arch.last_inst);
  73                 r = RESUME_HOST;
  74                 break;
  75         default:
  76                 BUG();
  77         }
  78
  79         return r;
  80 }
  81
  82 void kvm_arch_hardware_enable(void *garbage)
  83 {
  84 }
  85
  86 void kvm_arch_hardware_disable(void *garbage)
  87 {
  88 }
  89
  90 int kvm_arch_hardware_setup(void)
  91 {
  92         return 0;
  93 }
  94
  95 void kvm_arch_hardware_unsetup(void)
  96 {
  97 }
  98
  99 void kvm_arch_check_processor_compat(void *rtn)
 100 {
 101         int r;
 102
 103         if (strcmp(cur_cpu_spec->platform, "ppc440") == 0)
 104                 r = 0;
 105         else
 106                 r = -ENOTSUPP;
 107
 108         *(int *)rtn = r;
 109 }
 110
 111 struct kvm *kvm_arch_create_vm(void)
 112 {
 113         struct kvm *kvm;
 114
 115         kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
 116         if (!kvm)
 117                 return ERR_PTR(-ENOMEM);
 118
 119         return kvm;
 120 }
 121
 122 static void kvmppc_free_vcpus(struct kvm *kvm)
 123 {
 124         unsigned int i;
 125
 126         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 127                 if (kvm->vcpus[i]) {
 128                         kvm_arch_vcpu_free(kvm->vcpus[i]);
 129                         kvm->vcpus[i] = NULL;
 130                 }
 131         }
 132 }
 133
 134 void kvm_arch_destroy_vm(struct kvm *kvm)
 135 {
 136         kvmppc_free_vcpus(kvm);
 137         kvm_free_physmem(kvm);
 138         kfree(kvm);
 139 }
 140
 141 int kvm_dev_ioctl_check_extension(long ext)
 142 {
 143         int r;
 144
 145         switch (ext) {
 146         case KVM_CAP_USER_MEMORY:
 147                 r = 1;
 148                 break;
 149         case KVM_CAP_COALESCED_MMIO:
 150                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 151                 break;
 152         default:
 153                 r = 0;
 154                 break;
 155         }
 156         return r;
 157
 158 }
 159
 160 long kvm_arch_dev_ioctl(struct file *filp,
 161                         unsigned int ioctl, unsigned long arg)
 162 {
 163         return -EINVAL;
 164 }
 165
 166 int kvm_arch_set_memory_region(struct kvm *kvm,
 167                                struct kvm_userspace_memory_region *mem,
 168                                struct kvm_memory_slot old,
 169                                int user_alloc)
 170 {
 171         return 0;
 172 }
 173
 174 void kvm_arch_flush_shadow(struct kvm *kvm)
 175 {
 176 }
 177
 178 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 179 {
 180         struct kvm_vcpu *vcpu;
 181         int err;
 182
 183         vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
 184         if (!vcpu) {
 185                 err = -ENOMEM;
 186                 goto out;
 187         }
 188
 189         err = kvm_vcpu_init(vcpu, kvm, id);
 190         if (err)
 191                 goto free_vcpu;
 192
 193         return vcpu;
 194
 195 free_vcpu:
 196         kmem_cache_free(kvm_vcpu_cache, vcpu);
 197 out:
 198         return ERR_PTR(err);
 199 }
 200
 201 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 202 {
 203         kvm_vcpu_uninit(vcpu);
 204         kmem_cache_free(kvm_vcpu_cache, vcpu);
 205 }
 206
 207 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 208 {
 209         kvm_arch_vcpu_free(vcpu);
 210 }
 211
 212 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 213 {
 214         unsigned int priority = exception_priority[BOOKE_INTERRUPT_DECREMENTER];
 215
 216         return test_bit(priority, &vcpu->arch.pending_exceptions);
 217 }
 218
 219 static void kvmppc_decrementer_func(unsigned long data)
 220 {
 221         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
 222
 223         kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_DECREMENTER);
 224
 225         if (waitqueue_active(&vcpu->wq)) {
 226                 wake_up_interruptible(&vcpu->wq);
 227                 vcpu->stat.halt_wakeup++;
 228         }
 229 }
 230
 231 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 232 {
 233         setup_timer(&vcpu->arch.dec_timer, kvmppc_decrementer_func,
 234                     (unsigned long)vcpu);
 235
 236         return 0;
 237 }
 238
 239 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 240 {
 241         kvmppc_core_destroy_mmu(vcpu);
 242 }
 243
 244 /* Note: clearing MSR[DE] just means that the debug interrupt will not be
 245  * delivered *immediately*. Instead, it simply sets the appropriate DBSR bits.
 246  * If those DBSR bits are still set when MSR[DE] is re-enabled, the interrupt
 247  * will be delivered as an "imprecise debug event" (which is indicated by
 248  * DBSR[IDE].
 249  */
 250 static void kvmppc_disable_debug_interrupts(void)
 251 {
 252         mtmsr(mfmsr() & ~MSR_DE);
 253 }
 254
 255 static void kvmppc_restore_host_debug_state(struct kvm_vcpu *vcpu)
 256 {
 257         kvmppc_disable_debug_interrupts();
 258
 259         mtspr(SPRN_IAC1, vcpu->arch.host_iac[0]);
 260         mtspr(SPRN_IAC2, vcpu->arch.host_iac[1]);
 261         mtspr(SPRN_IAC3, vcpu->arch.host_iac[2]);
 262         mtspr(SPRN_IAC4, vcpu->arch.host_iac[3]);
 263         mtspr(SPRN_DBCR1, vcpu->arch.host_dbcr1);
 264         mtspr(SPRN_DBCR2, vcpu->arch.host_dbcr2);
 265         mtspr(SPRN_DBCR0, vcpu->arch.host_dbcr0);
 266         mtmsr(vcpu->arch.host_msr);
 267 }
 268
 269 static void kvmppc_load_guest_debug_registers(struct kvm_vcpu *vcpu)
 270 {
 271         struct kvm_guest_debug *dbg = &vcpu->guest_debug;
 272         u32 dbcr0 = 0;
 273
 274         vcpu->arch.host_msr = mfmsr();
 275         kvmppc_disable_debug_interrupts();
 276
 277         /* Save host debug register state. */
 278         vcpu->arch.host_iac[0] = mfspr(SPRN_IAC1);
 279         vcpu->arch.host_iac[1] = mfspr(SPRN_IAC2);
 280         vcpu->arch.host_iac[2] = mfspr(SPRN_IAC3);
 281         vcpu->arch.host_iac[3] = mfspr(SPRN_IAC4);
 282         vcpu->arch.host_dbcr0 = mfspr(SPRN_DBCR0);
 283         vcpu->arch.host_dbcr1 = mfspr(SPRN_DBCR1);
 284         vcpu->arch.host_dbcr2 = mfspr(SPRN_DBCR2);
 285
 286         /* set registers up for guest */
 287
 288         if (dbg->bp[0]) {
 289                 mtspr(SPRN_IAC1, dbg->bp[0]);
 290                 dbcr0 |= DBCR0_IAC1 | DBCR0_IDM;
 291         }
 292         if (dbg->bp[1]) {
 293                 mtspr(SPRN_IAC2, dbg->bp[1]);
 294                 dbcr0 |= DBCR0_IAC2 | DBCR0_IDM;
 295         }
 296         if (dbg->bp[2]) {
 297                 mtspr(SPRN_IAC3, dbg->bp[2]);
 298                 dbcr0 |= DBCR0_IAC3 | DBCR0_IDM;
 299         }
 300         if (dbg->bp[3]) {
 301                 mtspr(SPRN_IAC4, dbg->bp[3]);
 302                 dbcr0 |= DBCR0_IAC4 | DBCR0_IDM;
 303         }
 304
 305         mtspr(SPRN_DBCR0, dbcr0);
 306         mtspr(SPRN_DBCR1, 0);
 307         mtspr(SPRN_DBCR2, 0);
 308 }
 309
 310 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 311 {
 312         int i;
 313
 314         if (vcpu->guest_debug.enabled)
 315                 kvmppc_load_guest_debug_registers(vcpu);
 316
 317         /* Mark every guest entry in the shadow TLB entry modified, so that they
 318          * will all be reloaded on the next vcpu run (instead of being
 319          * demand-faulted). */
 320         for (i = 0; i <= tlb_44x_hwater; i++)
 321                 kvmppc_tlbe_set_modified(vcpu, i);
 322 }
 323
 324 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 325 {
 326         if (vcpu->guest_debug.enabled)
 327                 kvmppc_restore_host_debug_state(vcpu);
 328
 329         /* Don't leave guest TLB entries resident when being de-scheduled. */
 330         /* XXX It would be nice to differentiate between heavyweight exit and
 331          * sched_out here, since we could avoid the TLB flush for heavyweight
 332          * exits. */
 333         _tlbia();
 334 }
 335
 336 int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
 337                                     struct kvm_debug_guest *dbg)
 338 {
 339         int i;
 340
 341         vcpu->guest_debug.enabled = dbg->enabled;
 342         if (vcpu->guest_debug.enabled) {
 343                 for (i=0; i < ARRAY_SIZE(vcpu->guest_debug.bp); i++) {
 344                         if (dbg->breakpoints[i].enabled)
 345                                 vcpu->guest_debug.bp[i] = dbg->breakpoints[i].address;
 346                         else
 347                                 vcpu->guest_debug.bp[i] = 0;
 348                 }
 349         }
 350
 351         return 0;
 352 }
 353
 354 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
 355                                      struct kvm_run *run)
 356 {
 357         u32 *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
 358         *gpr = run->dcr.data;
 359 }
 360
 361 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
 362                                       struct kvm_run *run)
 363 {
 364         u32 *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
 365
 366         if (run->mmio.len > sizeof(*gpr)) {
 367                 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
 368                 return;
 369         }
 370
 371         if (vcpu->arch.mmio_is_bigendian) {
 372                 switch (run->mmio.len) {
 373                 case 4: *gpr = *(u32 *)run->mmio.data; break;
 374                 case 2: *gpr = *(u16 *)run->mmio.data; break;
 375                 case 1: *gpr = *(u8 *)run->mmio.data; break;
 376                 }
 377         } else {
 378                 /* Convert BE data from userland back to LE. */
 379                 switch (run->mmio.len) {
 380                 case 4: *gpr = ld_le32((u32 *)run->mmio.data); break;
 381                 case 2: *gpr = ld_le16((u16 *)run->mmio.data); break;
 382                 case 1: *gpr = *(u8 *)run->mmio.data; break;
 383                 }
 384         }
 385 }
 386
 387 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
 388                        unsigned int rt, unsigned int bytes, int is_bigendian)
 389 {
 390         if (bytes > sizeof(run->mmio.data)) {
 391                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 392                        run->mmio.len);
 393         }
 394
 395         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 396         run->mmio.len = bytes;
 397         run->mmio.is_write = 0;
 398
 399         vcpu->arch.io_gpr = rt;
 400         vcpu->arch.mmio_is_bigendian = is_bigendian;
 401         vcpu->mmio_needed = 1;
 402         vcpu->mmio_is_write = 0;
 403
 404         return EMULATE_DO_MMIO;
 405 }
 406
 407 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
 408                         u32 val, unsigned int bytes, int is_bigendian)
 409 {
 410         void *data = run->mmio.data;
 411
 412         if (bytes > sizeof(run->mmio.data)) {
 413                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 414                        run->mmio.len);
 415         }
 416
 417         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 418         run->mmio.len = bytes;
 419         run->mmio.is_write = 1;
 420         vcpu->mmio_needed = 1;
 421         vcpu->mmio_is_write = 1;
 422
 423         /* Store the value at the lowest bytes in 'data'. */
 424         if (is_bigendian) {
 425                 switch (bytes) {
 426                 case 4: *(u32 *)data = val; break;
 427                 case 2: *(u16 *)data = val; break;
 428                 case 1: *(u8  *)data = val; break;
 429                 }
 430         } else {
 431                 /* Store LE value into 'data'. */
 432                 switch (bytes) {
 433                 case 4: st_le32(data, val); break;
 434                 case 2: st_le16(data, val); break;
 435                 case 1: *(u8 *)data = val; break;
 436                 }
 437         }
 438
 439         return EMULATE_DO_MMIO;
 440 }
 441
 442 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 443 {
 444         int r;
 445         sigset_t sigsaved;
 446
 447         vcpu_load(vcpu);
 448
 449         if (vcpu->sigset_active)
 450                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 451
 452         if (vcpu->mmio_needed) {
 453                 if (!vcpu->mmio_is_write)
 454                         kvmppc_complete_mmio_load(vcpu, run);
 455                 vcpu->mmio_needed = 0;
 456         } else if (vcpu->arch.dcr_needed) {
 457                 if (!vcpu->arch.dcr_is_write)
 458                         kvmppc_complete_dcr_load(vcpu, run);
 459                 vcpu->arch.dcr_needed = 0;
 460         }
 461
 462         kvmppc_check_and_deliver_interrupts(vcpu);
 463
 464         local_irq_disable();
 465         kvm_guest_enter();
 466         r = __kvmppc_vcpu_run(run, vcpu);
 467         kvm_guest_exit();
 468         local_irq_enable();
 469
 470         if (vcpu->sigset_active)
 471                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 472
 473         vcpu_put(vcpu);
 474
 475         return r;
 476 }
 477
 478 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
 479 {
 480         kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_EXTERNAL);
 481
 482         if (waitqueue_active(&vcpu->wq)) {
 483                 wake_up_interruptible(&vcpu->wq);
 484                 vcpu->stat.halt_wakeup++;
 485         }
 486
 487         return 0;
 488 }
 489
 490 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 491                                     struct kvm_mp_state *mp_state)
 492 {
 493         return -EINVAL;
 494 }
 495
 496 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 497                                     struct kvm_mp_state *mp_state)
 498 {
 499         return -EINVAL;
 500 }
 501
 502 long kvm_arch_vcpu_ioctl(struct file *filp,
 503                          unsigned int ioctl, unsigned long arg)
 504 {
 505         struct kvm_vcpu *vcpu = filp->private_data;
 506         void __user *argp = (void __user *)arg;
 507         long r;
 508
 509         switch (ioctl) {
 510         case KVM_INTERRUPT: {
 511                 struct kvm_interrupt irq;
 512                 r = -EFAULT;
 513                 if (copy_from_user(&irq, argp, sizeof(irq)))
 514                         goto out;
 515                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 516                 break;
 517         }
 518         default:
 519                 r = -EINVAL;
 520         }
 521
 522 out:
 523         return r;
 524 }
 525
 526 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
 527 {
 528         return -ENOTSUPP;
 529 }
 530
 531 long kvm_arch_vm_ioctl(struct file *filp,
 532                        unsigned int ioctl, unsigned long arg)
 533 {
 534         long r;
 535
 536         switch (ioctl) {
 537         default:
 538                 r = -EINVAL;
 539         }
 540
 541         return r;
 542 }
 543
 544 int kvm_arch_init(void *opaque)
 545 {
 546         return 0;
 547 }
 548
 549 void kvm_arch_exit(void)
 550 {
 551 }