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/hrtimer.h>
  27 #include <linux/fs.h>
  28 #include <linux/slab.h>
  29 #include <asm/cputable.h>
  30 #include <asm/uaccess.h>
  31 #include <asm/kvm_ppc.h>
  32 #include <asm/tlbflush.h>
  33 #include "timing.h"
  34 #include "../mm/mmu_decl.h"
  35
  36 #define CREATE_TRACE_POINTS
  37 #include "trace.h"
  38
  39 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
  40 {
  41         return !(v->arch.msr & MSR_WE) || !!(v->arch.pending_exceptions);
  42 }
  43
  44
  45 int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu)
  46 {
  47         enum emulation_result er;
  48         int r;
  49
  50         er = kvmppc_emulate_instruction(run, vcpu);
  51         switch (er) {
  52         case EMULATE_DONE:
  53                 /* Future optimization: only reload non-volatiles if they were
  54                  * actually modified. */
  55                 r = RESUME_GUEST_NV;
  56                 break;
  57         case EMULATE_DO_MMIO:
  58                 run->exit_reason = KVM_EXIT_MMIO;
  59                 /* We must reload nonvolatiles because "update" load/store
  60                  * instructions modify register state. */
  61                 /* Future optimization: only reload non-volatiles if they were
  62                  * actually modified. */
  63                 r = RESUME_HOST_NV;
  64                 break;
  65         case EMULATE_FAIL:
  66                 /* XXX Deliver Program interrupt to guest. */
  67                 printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__,
  68                        kvmppc_get_last_inst(vcpu));
  69                 r = RESUME_HOST;
  70                 break;
  71         default:
  72                 BUG();
  73         }
  74
  75         return r;
  76 }
  77
  78 int kvm_arch_hardware_enable(void *garbage)
  79 {
  80         return 0;
  81 }
  82
  83 void kvm_arch_hardware_disable(void *garbage)
  84 {
  85 }
  86
  87 int kvm_arch_hardware_setup(void)
  88 {
  89         return 0;
  90 }
  91
  92 void kvm_arch_hardware_unsetup(void)
  93 {
  94 }
  95
  96 void kvm_arch_check_processor_compat(void *rtn)
  97 {
  98         *(int *)rtn = kvmppc_core_check_processor_compat();
  99 }
 100
 101 struct kvm *kvm_arch_create_vm(void)
 102 {
 103         struct kvm *kvm;
 104
 105         kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
 106         if (!kvm)
 107                 return ERR_PTR(-ENOMEM);
 108
 109         return kvm;
 110 }
 111
 112 static void kvmppc_free_vcpus(struct kvm *kvm)
 113 {
 114         unsigned int i;
 115         struct kvm_vcpu *vcpu;
 116
 117         kvm_for_each_vcpu(i, vcpu, kvm)
 118                 kvm_arch_vcpu_free(vcpu);
 119
 120         mutex_lock(&kvm->lock);
 121         for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
 122                 kvm->vcpus[i] = NULL;
 123
 124         atomic_set(&kvm->online_vcpus, 0);
 125         mutex_unlock(&kvm->lock);
 126 }
 127
 128 void kvm_arch_sync_events(struct kvm *kvm)
 129 {
 130 }
 131
 132 void kvm_arch_destroy_vm(struct kvm *kvm)
 133 {
 134         kvmppc_free_vcpus(kvm);
 135         kvm_free_physmem(kvm);
 136         cleanup_srcu_struct(&kvm->srcu);
 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_PPC_SEGSTATE:
 146         case KVM_CAP_PPC_PAIRED_SINGLES:
 147         case KVM_CAP_PPC_UNSET_IRQ:
 148         case KVM_CAP_ENABLE_CAP:
 149         case KVM_CAP_PPC_OSI:
 150                 r = 1;
 151                 break;
 152         case KVM_CAP_COALESCED_MMIO:
 153                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 154                 break;
 155         default:
 156                 r = 0;
 157                 break;
 158         }
 159         return r;
 160
 161 }
 162
 163 long kvm_arch_dev_ioctl(struct file *filp,
 164                         unsigned int ioctl, unsigned long arg)
 165 {
 166         return -EINVAL;
 167 }
 168
 169 int kvm_arch_prepare_memory_region(struct kvm *kvm,
 170                                    struct kvm_memory_slot *memslot,
 171                                    struct kvm_memory_slot old,
 172                                    struct kvm_userspace_memory_region *mem,
 173                                    int user_alloc)
 174 {
 175         return 0;
 176 }
 177
 178 void kvm_arch_commit_memory_region(struct kvm *kvm,
 179                struct kvm_userspace_memory_region *mem,
 180                struct kvm_memory_slot old,
 181                int user_alloc)
 182 {
 183        return;
 184 }
 185
 186
 187 void kvm_arch_flush_shadow(struct kvm *kvm)
 188 {
 189 }
 190
 191 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 192 {
 193         struct kvm_vcpu *vcpu;
 194         vcpu = kvmppc_core_vcpu_create(kvm, id);
 195         if (!IS_ERR(vcpu))
 196                 kvmppc_create_vcpu_debugfs(vcpu, id);
 197         return vcpu;
 198 }
 199
 200 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 201 {
 202         /* Make sure we're not using the vcpu anymore */
 203         hrtimer_cancel(&vcpu->arch.dec_timer);
 204         tasklet_kill(&vcpu->arch.tasklet);
 205
 206         kvmppc_remove_vcpu_debugfs(vcpu);
 207         kvmppc_core_vcpu_free(vcpu);
 208 }
 209
 210 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 211 {
 212         kvm_arch_vcpu_free(vcpu);
 213 }
 214
 215 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 216 {
 217         return kvmppc_core_pending_dec(vcpu);
 218 }
 219
 220 static void kvmppc_decrementer_func(unsigned long data)
 221 {
 222         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
 223
 224         kvmppc_core_queue_dec(vcpu);
 225
 226         if (waitqueue_active(&vcpu->wq)) {
 227                 wake_up_interruptible(&vcpu->wq);
 228                 vcpu->stat.halt_wakeup++;
 229         }
 230 }
 231
 232 /*
 233  * low level hrtimer wake routine. Because this runs in hardirq context
 234  * we schedule a tasklet to do the real work.
 235  */
 236 enum hrtimer_restart kvmppc_decrementer_wakeup(struct hrtimer *timer)
 237 {
 238         struct kvm_vcpu *vcpu;
 239
 240         vcpu = container_of(timer, struct kvm_vcpu, arch.dec_timer);
 241         tasklet_schedule(&vcpu->arch.tasklet);
 242
 243         return HRTIMER_NORESTART;
 244 }
 245
 246 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 247 {
 248         hrtimer_init(&vcpu->arch.dec_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
 249         tasklet_init(&vcpu->arch.tasklet, kvmppc_decrementer_func, (ulong)vcpu);
 250         vcpu->arch.dec_timer.function = kvmppc_decrementer_wakeup;
 251
 252         return 0;
 253 }
 254
 255 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 256 {
 257         kvmppc_mmu_destroy(vcpu);
 258 }
 259
 260 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 261 {
 262         kvmppc_core_vcpu_load(vcpu, cpu);
 263 }
 264
 265 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 266 {
 267         kvmppc_core_vcpu_put(vcpu);
 268 }
 269
 270 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 271                                         struct kvm_guest_debug *dbg)
 272 {
 273         return -EINVAL;
 274 }
 275
 276 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
 277                                      struct kvm_run *run)
 278 {
 279         kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, run->dcr.data);
 280 }
 281
 282 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
 283                                       struct kvm_run *run)
 284 {
 285         u64 uninitialized_var(gpr);
 286
 287         if (run->mmio.len > sizeof(gpr)) {
 288                 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
 289                 return;
 290         }
 291
 292         if (vcpu->arch.mmio_is_bigendian) {
 293                 switch (run->mmio.len) {
 294                 case 8: gpr = *(u64 *)run->mmio.data; break;
 295                 case 4: gpr = *(u32 *)run->mmio.data; break;
 296                 case 2: gpr = *(u16 *)run->mmio.data; break;
 297                 case 1: gpr = *(u8 *)run->mmio.data; break;
 298                 }
 299         } else {
 300                 /* Convert BE data from userland back to LE. */
 301                 switch (run->mmio.len) {
 302                 case 4: gpr = ld_le32((u32 *)run->mmio.data); break;
 303                 case 2: gpr = ld_le16((u16 *)run->mmio.data); break;
 304                 case 1: gpr = *(u8 *)run->mmio.data; break;
 305                 }
 306         }
 307
 308         if (vcpu->arch.mmio_sign_extend) {
 309                 switch (run->mmio.len) {
 310 #ifdef CONFIG_PPC64
 311                 case 4:
 312                         gpr = (s64)(s32)gpr;
 313                         break;
 314 #endif
 315                 case 2:
 316                         gpr = (s64)(s16)gpr;
 317                         break;
 318                 case 1:
 319                         gpr = (s64)(s8)gpr;
 320                         break;
 321                 }
 322         }
 323
 324         kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
 325
 326         switch (vcpu->arch.io_gpr & KVM_REG_EXT_MASK) {
 327         case KVM_REG_GPR:
 328                 kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
 329                 break;
 330         case KVM_REG_FPR:
 331                 vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 332                 break;
 333 #ifdef CONFIG_PPC_BOOK3S
 334         case KVM_REG_QPR:
 335                 vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 336                 break;
 337         case KVM_REG_FQPR:
 338                 vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 339                 vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 340                 break;
 341 #endif
 342         default:
 343                 BUG();
 344         }
 345 }
 346
 347 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
 348                        unsigned int rt, unsigned int bytes, int is_bigendian)
 349 {
 350         if (bytes > sizeof(run->mmio.data)) {
 351                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 352                        run->mmio.len);
 353         }
 354
 355         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 356         run->mmio.len = bytes;
 357         run->mmio.is_write = 0;
 358
 359         vcpu->arch.io_gpr = rt;
 360         vcpu->arch.mmio_is_bigendian = is_bigendian;
 361         vcpu->mmio_needed = 1;
 362         vcpu->mmio_is_write = 0;
 363         vcpu->arch.mmio_sign_extend = 0;
 364
 365         return EMULATE_DO_MMIO;
 366 }
 367
 368 /* Same as above, but sign extends */
 369 int kvmppc_handle_loads(struct kvm_run *run, struct kvm_vcpu *vcpu,
 370                         unsigned int rt, unsigned int bytes, int is_bigendian)
 371 {
 372         int r;
 373
 374         r = kvmppc_handle_load(run, vcpu, rt, bytes, is_bigendian);
 375         vcpu->arch.mmio_sign_extend = 1;
 376
 377         return r;
 378 }
 379
 380 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
 381                         u64 val, unsigned int bytes, int is_bigendian)
 382 {
 383         void *data = run->mmio.data;
 384
 385         if (bytes > sizeof(run->mmio.data)) {
 386                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 387                        run->mmio.len);
 388         }
 389
 390         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 391         run->mmio.len = bytes;
 392         run->mmio.is_write = 1;
 393         vcpu->mmio_needed = 1;
 394         vcpu->mmio_is_write = 1;
 395
 396         /* Store the value at the lowest bytes in 'data'. */
 397         if (is_bigendian) {
 398                 switch (bytes) {
 399                 case 8: *(u64 *)data = val; break;
 400                 case 4: *(u32 *)data = val; break;
 401                 case 2: *(u16 *)data = val; break;
 402                 case 1: *(u8  *)data = val; break;
 403                 }
 404         } else {
 405                 /* Store LE value into 'data'. */
 406                 switch (bytes) {
 407                 case 4: st_le32(data, val); break;
 408                 case 2: st_le16(data, val); break;
 409                 case 1: *(u8 *)data = val; break;
 410                 }
 411         }
 412
 413         return EMULATE_DO_MMIO;
 414 }
 415
 416 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 417 {
 418         int r;
 419         sigset_t sigsaved;
 420
 421         if (vcpu->sigset_active)
 422                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 423
 424         if (vcpu->mmio_needed) {
 425                 if (!vcpu->mmio_is_write)
 426                         kvmppc_complete_mmio_load(vcpu, run);
 427                 vcpu->mmio_needed = 0;
 428         } else if (vcpu->arch.dcr_needed) {
 429                 if (!vcpu->arch.dcr_is_write)
 430                         kvmppc_complete_dcr_load(vcpu, run);
 431                 vcpu->arch.dcr_needed = 0;
 432         } else if (vcpu->arch.osi_needed) {
 433                 u64 *gprs = run->osi.gprs;
 434                 int i;
 435
 436                 for (i = 0; i < 32; i++)
 437                         kvmppc_set_gpr(vcpu, i, gprs[i]);
 438                 vcpu->arch.osi_needed = 0;
 439         }
 440
 441         kvmppc_core_deliver_interrupts(vcpu);
 442
 443         local_irq_disable();
 444         kvm_guest_enter();
 445         r = __kvmppc_vcpu_run(run, vcpu);
 446         kvm_guest_exit();
 447         local_irq_enable();
 448
 449         if (vcpu->sigset_active)
 450                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 451
 452         return r;
 453 }
 454
 455 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
 456 {
 457         if (irq->irq == KVM_INTERRUPT_UNSET)
 458                 kvmppc_core_dequeue_external(vcpu, irq);
 459         else
 460                 kvmppc_core_queue_external(vcpu, irq);
 461
 462         if (waitqueue_active(&vcpu->wq)) {
 463                 wake_up_interruptible(&vcpu->wq);
 464                 vcpu->stat.halt_wakeup++;
 465         }
 466
 467         return 0;
 468 }
 469
 470 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
 471                                      struct kvm_enable_cap *cap)
 472 {
 473         int r;
 474
 475         if (cap->flags)
 476                 return -EINVAL;
 477
 478         switch (cap->cap) {
 479         case KVM_CAP_PPC_OSI:
 480                 r = 0;
 481                 vcpu->arch.osi_enabled = true;
 482                 break;
 483         default:
 484                 r = -EINVAL;
 485                 break;
 486         }
 487
 488         return r;
 489 }
 490
 491 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 492                                     struct kvm_mp_state *mp_state)
 493 {
 494         return -EINVAL;
 495 }
 496
 497 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 498                                     struct kvm_mp_state *mp_state)
 499 {
 500         return -EINVAL;
 501 }
 502
 503 long kvm_arch_vcpu_ioctl(struct file *filp,
 504                          unsigned int ioctl, unsigned long arg)
 505 {
 506         struct kvm_vcpu *vcpu = filp->private_data;
 507         void __user *argp = (void __user *)arg;
 508         long r;
 509
 510         switch (ioctl) {
 511         case KVM_INTERRUPT: {
 512                 struct kvm_interrupt irq;
 513                 r = -EFAULT;
 514                 if (copy_from_user(&irq, argp, sizeof(irq)))
 515                         goto out;
 516                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 517                 goto out;
 518         }
 519
 520         case KVM_ENABLE_CAP:
 521         {
 522                 struct kvm_enable_cap cap;
 523                 r = -EFAULT;
 524                 if (copy_from_user(&cap, argp, sizeof(cap)))
 525                         goto out;
 526                 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
 527                 break;
 528         }
 529         default:
 530                 r = -EINVAL;
 531         }
 532
 533 out:
 534         return r;
 535 }
 536
 537 long kvm_arch_vm_ioctl(struct file *filp,
 538                        unsigned int ioctl, unsigned long arg)
 539 {
 540         long r;
 541
 542         switch (ioctl) {
 543         default:
 544                 r = -ENOTTY;
 545         }
 546
 547         return r;
 548 }
 549
 550 int kvm_arch_init(void *opaque)
 551 {
 552         return 0;
 553 }
 554
 555 void kvm_arch_exit(void)
 556 {
 557 }