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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/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 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
  40 {
  41         return gfn;
  42 }
  43
  44 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
  45 {
  46         return !(v->arch.msr & MSR_WE) || !!(v->arch.pending_exceptions);
  47 }
  48
  49
  50 int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu)
  51 {
  52         enum emulation_result er;
  53         int r;
  54
  55         er = kvmppc_emulate_instruction(run, vcpu);
  56         switch (er) {
  57         case EMULATE_DONE:
  58                 /* Future optimization: only reload non-volatiles if they were
  59                  * actually modified. */
  60                 r = RESUME_GUEST_NV;
  61                 break;
  62         case EMULATE_DO_MMIO:
  63                 run->exit_reason = KVM_EXIT_MMIO;
  64                 /* We must reload nonvolatiles because "update" load/store
  65                  * instructions modify register state. */
  66                 /* Future optimization: only reload non-volatiles if they were
  67                  * actually modified. */
  68                 r = RESUME_HOST_NV;
  69                 break;
  70         case EMULATE_FAIL:
  71                 /* XXX Deliver Program interrupt to guest. */
  72                 printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__,
  73                        vcpu->arch.last_inst);
  74                 r = RESUME_HOST;
  75                 break;
  76         default:
  77                 BUG();
  78         }
  79
  80         return r;
  81 }
  82
  83 int kvm_arch_hardware_enable(void *garbage)
  84 {
  85         return 0;
  86 }
  87
  88 void kvm_arch_hardware_disable(void *garbage)
  89 {
  90 }
  91
  92 int kvm_arch_hardware_setup(void)
  93 {
  94         return 0;
  95 }
  96
  97 void kvm_arch_hardware_unsetup(void)
  98 {
  99 }
 100
 101 void kvm_arch_check_processor_compat(void *rtn)
 102 {
 103         *(int *)rtn = kvmppc_core_check_processor_compat();
 104 }
 105
 106 struct kvm *kvm_arch_create_vm(void)
 107 {
 108         struct kvm *kvm;
 109
 110         kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
 111         if (!kvm)
 112                 return ERR_PTR(-ENOMEM);
 113
 114         return kvm;
 115 }
 116
 117 static void kvmppc_free_vcpus(struct kvm *kvm)
 118 {
 119         unsigned int i;
 120         struct kvm_vcpu *vcpu;
 121
 122         kvm_for_each_vcpu(i, vcpu, kvm)
 123                 kvm_arch_vcpu_free(vcpu);
 124
 125         mutex_lock(&kvm->lock);
 126         for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
 127                 kvm->vcpus[i] = NULL;
 128
 129         atomic_set(&kvm->online_vcpus, 0);
 130         mutex_unlock(&kvm->lock);
 131 }
 132
 133 void kvm_arch_sync_events(struct kvm *kvm)
 134 {
 135 }
 136
 137 void kvm_arch_destroy_vm(struct kvm *kvm)
 138 {
 139         kvmppc_free_vcpus(kvm);
 140         kvm_free_physmem(kvm);
 141         cleanup_srcu_struct(&kvm->srcu);
 142         kfree(kvm);
 143 }
 144
 145 int kvm_dev_ioctl_check_extension(long ext)
 146 {
 147         int r;
 148
 149         switch (ext) {
 150         case KVM_CAP_PPC_SEGSTATE:
 151         case KVM_CAP_PPC_PAIRED_SINGLES:
 152         case KVM_CAP_PPC_UNSET_IRQ:
 153         case KVM_CAP_ENABLE_CAP:
 154                 r = 1;
 155                 break;
 156         case KVM_CAP_COALESCED_MMIO:
 157                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 158                 break;
 159         default:
 160                 r = 0;
 161                 break;
 162         }
 163         return r;
 164
 165 }
 166
 167 long kvm_arch_dev_ioctl(struct file *filp,
 168                         unsigned int ioctl, unsigned long arg)
 169 {
 170         return -EINVAL;
 171 }
 172
 173 int kvm_arch_prepare_memory_region(struct kvm *kvm,
 174                                    struct kvm_memory_slot *memslot,
 175                                    struct kvm_memory_slot old,
 176                                    struct kvm_userspace_memory_region *mem,
 177                                    int user_alloc)
 178 {
 179         return 0;
 180 }
 181
 182 void kvm_arch_commit_memory_region(struct kvm *kvm,
 183                struct kvm_userspace_memory_region *mem,
 184                struct kvm_memory_slot old,
 185                int user_alloc)
 186 {
 187        return;
 188 }
 189
 190
 191 void kvm_arch_flush_shadow(struct kvm *kvm)
 192 {
 193 }
 194
 195 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 196 {
 197         struct kvm_vcpu *vcpu;
 198         vcpu = kvmppc_core_vcpu_create(kvm, id);
 199         if (!IS_ERR(vcpu))
 200                 kvmppc_create_vcpu_debugfs(vcpu, id);
 201         return vcpu;
 202 }
 203
 204 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 205 {
 206         /* Make sure we're not using the vcpu anymore */
 207         hrtimer_cancel(&vcpu->arch.dec_timer);
 208         tasklet_kill(&vcpu->arch.tasklet);
 209
 210         kvmppc_remove_vcpu_debugfs(vcpu);
 211         kvmppc_core_vcpu_free(vcpu);
 212 }
 213
 214 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 215 {
 216         kvm_arch_vcpu_free(vcpu);
 217 }
 218
 219 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 220 {
 221         return kvmppc_core_pending_dec(vcpu);
 222 }
 223
 224 static void kvmppc_decrementer_func(unsigned long data)
 225 {
 226         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
 227
 228         kvmppc_core_queue_dec(vcpu);
 229
 230         if (waitqueue_active(&vcpu->wq)) {
 231                 wake_up_interruptible(&vcpu->wq);
 232                 vcpu->stat.halt_wakeup++;
 233         }
 234 }
 235
 236 /*
 237  * low level hrtimer wake routine. Because this runs in hardirq context
 238  * we schedule a tasklet to do the real work.
 239  */
 240 enum hrtimer_restart kvmppc_decrementer_wakeup(struct hrtimer *timer)
 241 {
 242         struct kvm_vcpu *vcpu;
 243
 244         vcpu = container_of(timer, struct kvm_vcpu, arch.dec_timer);
 245         tasklet_schedule(&vcpu->arch.tasklet);
 246
 247         return HRTIMER_NORESTART;
 248 }
 249
 250 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 251 {
 252         hrtimer_init(&vcpu->arch.dec_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
 253         tasklet_init(&vcpu->arch.tasklet, kvmppc_decrementer_func, (ulong)vcpu);
 254         vcpu->arch.dec_timer.function = kvmppc_decrementer_wakeup;
 255
 256         return 0;
 257 }
 258
 259 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 260 {
 261         kvmppc_mmu_destroy(vcpu);
 262 }
 263
 264 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 265 {
 266         kvmppc_core_vcpu_load(vcpu, cpu);
 267 }
 268
 269 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 270 {
 271         kvmppc_core_vcpu_put(vcpu);
 272 }
 273
 274 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 275                                         struct kvm_guest_debug *dbg)
 276 {
 277         return -EINVAL;
 278 }
 279
 280 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
 281                                      struct kvm_run *run)
 282 {
 283         kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, run->dcr.data);
 284 }
 285
 286 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
 287                                       struct kvm_run *run)
 288 {
 289         u64 gpr;
 290
 291         if (run->mmio.len > sizeof(gpr)) {
 292                 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
 293                 return;
 294         }
 295
 296         if (vcpu->arch.mmio_is_bigendian) {
 297                 switch (run->mmio.len) {
 298                 case 8: gpr = *(u64 *)run->mmio.data; break;
 299                 case 4: gpr = *(u32 *)run->mmio.data; break;
 300                 case 2: gpr = *(u16 *)run->mmio.data; break;
 301                 case 1: gpr = *(u8 *)run->mmio.data; break;
 302                 }
 303         } else {
 304                 /* Convert BE data from userland back to LE. */
 305                 switch (run->mmio.len) {
 306                 case 4: gpr = ld_le32((u32 *)run->mmio.data); break;
 307                 case 2: gpr = ld_le16((u16 *)run->mmio.data); break;
 308                 case 1: gpr = *(u8 *)run->mmio.data; break;
 309                 }
 310         }
 311
 312         if (vcpu->arch.mmio_sign_extend) {
 313                 switch (run->mmio.len) {
 314 #ifdef CONFIG_PPC64
 315                 case 4:
 316                         gpr = (s64)(s32)gpr;
 317                         break;
 318 #endif
 319                 case 2:
 320                         gpr = (s64)(s16)gpr;
 321                         break;
 322                 case 1:
 323                         gpr = (s64)(s8)gpr;
 324                         break;
 325                 }
 326         }
 327
 328         kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
 329
 330         switch (vcpu->arch.io_gpr & KVM_REG_EXT_MASK) {
 331         case KVM_REG_GPR:
 332                 kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
 333                 break;
 334         case KVM_REG_FPR:
 335                 vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 336                 break;
 337         case KVM_REG_QPR:
 338                 vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 339                 break;
 340         case KVM_REG_FQPR:
 341                 vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 342                 vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 343                 break;
 344         default:
 345                 BUG();
 346         }
 347 }
 348
 349 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
 350                        unsigned int rt, unsigned int bytes, int is_bigendian)
 351 {
 352         if (bytes > sizeof(run->mmio.data)) {
 353                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 354                        run->mmio.len);
 355         }
 356
 357         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 358         run->mmio.len = bytes;
 359         run->mmio.is_write = 0;
 360
 361         vcpu->arch.io_gpr = rt;
 362         vcpu->arch.mmio_is_bigendian = is_bigendian;
 363         vcpu->mmio_needed = 1;
 364         vcpu->mmio_is_write = 0;
 365         vcpu->arch.mmio_sign_extend = 0;
 366
 367         return EMULATE_DO_MMIO;
 368 }
 369
 370 /* Same as above, but sign extends */
 371 int kvmppc_handle_loads(struct kvm_run *run, struct kvm_vcpu *vcpu,
 372                         unsigned int rt, unsigned int bytes, int is_bigendian)
 373 {
 374         int r;
 375
 376         r = kvmppc_handle_load(run, vcpu, rt, bytes, is_bigendian);
 377         vcpu->arch.mmio_sign_extend = 1;
 378
 379         return r;
 380 }
 381
 382 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
 383                         u64 val, unsigned int bytes, int is_bigendian)
 384 {
 385         void *data = run->mmio.data;
 386
 387         if (bytes > sizeof(run->mmio.data)) {
 388                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 389                        run->mmio.len);
 390         }
 391
 392         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 393         run->mmio.len = bytes;
 394         run->mmio.is_write = 1;
 395         vcpu->mmio_needed = 1;
 396         vcpu->mmio_is_write = 1;
 397
 398         /* Store the value at the lowest bytes in 'data'. */
 399         if (is_bigendian) {
 400                 switch (bytes) {
 401                 case 8: *(u64 *)data = val; break;
 402                 case 4: *(u32 *)data = val; break;
 403                 case 2: *(u16 *)data = val; break;
 404                 case 1: *(u8  *)data = val; break;
 405                 }
 406         } else {
 407                 /* Store LE value into 'data'. */
 408                 switch (bytes) {
 409                 case 4: st_le32(data, val); break;
 410                 case 2: st_le16(data, val); break;
 411                 case 1: *(u8 *)data = val; break;
 412                 }
 413         }
 414
 415         return EMULATE_DO_MMIO;
 416 }
 417
 418 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 419 {
 420         int r;
 421         sigset_t sigsaved;
 422
 423         vcpu_load(vcpu);
 424
 425         if (vcpu->sigset_active)
 426                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 427
 428         if (vcpu->mmio_needed) {
 429                 if (!vcpu->mmio_is_write)
 430                         kvmppc_complete_mmio_load(vcpu, run);
 431                 vcpu->mmio_needed = 0;
 432         } else if (vcpu->arch.dcr_needed) {
 433                 if (!vcpu->arch.dcr_is_write)
 434                         kvmppc_complete_dcr_load(vcpu, run);
 435                 vcpu->arch.dcr_needed = 0;
 436         }
 437
 438         kvmppc_core_deliver_interrupts(vcpu);
 439
 440         local_irq_disable();
 441         kvm_guest_enter();
 442         r = __kvmppc_vcpu_run(run, vcpu);
 443         kvm_guest_exit();
 444         local_irq_enable();
 445
 446         if (vcpu->sigset_active)
 447                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 448
 449         vcpu_put(vcpu);
 450
 451         return r;
 452 }
 453
 454 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
 455 {
 456         if (irq->irq == KVM_INTERRUPT_UNSET)
 457                 kvmppc_core_dequeue_external(vcpu, irq);
 458         else
 459                 kvmppc_core_queue_external(vcpu, irq);
 460
 461         if (waitqueue_active(&vcpu->wq)) {
 462                 wake_up_interruptible(&vcpu->wq);
 463                 vcpu->stat.halt_wakeup++;
 464         }
 465
 466         return 0;
 467 }
 468
 469 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
 470                                      struct kvm_enable_cap *cap)
 471 {
 472         int r;
 473
 474         if (cap->flags)
 475                 return -EINVAL;
 476
 477         switch (cap->cap) {
 478         default:
 479                 r = -EINVAL;
 480                 break;
 481         }
 482
 483         return r;
 484 }
 485
 486 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 487                                     struct kvm_mp_state *mp_state)
 488 {
 489         return -EINVAL;
 490 }
 491
 492 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 493                                     struct kvm_mp_state *mp_state)
 494 {
 495         return -EINVAL;
 496 }
 497
 498 long kvm_arch_vcpu_ioctl(struct file *filp,
 499                          unsigned int ioctl, unsigned long arg)
 500 {
 501         struct kvm_vcpu *vcpu = filp->private_data;
 502         void __user *argp = (void __user *)arg;
 503         long r;
 504
 505         switch (ioctl) {
 506         case KVM_INTERRUPT: {
 507                 struct kvm_interrupt irq;
 508                 r = -EFAULT;
 509                 if (copy_from_user(&irq, argp, sizeof(irq)))
 510                         goto out;
 511                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 512                 break;
 513         }
 514         case KVM_ENABLE_CAP:
 515         {
 516                 struct kvm_enable_cap cap;
 517                 r = -EFAULT;
 518                 if (copy_from_user(&cap, argp, sizeof(cap)))
 519                         goto out;
 520                 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
 521                 break;
 522         }
 523         default:
 524                 r = -EINVAL;
 525         }
 526
 527 out:
 528         return r;
 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 = -ENOTTY;
 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 }