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.shared->msr & MSR_WE) ||
  42                !!(v->arch.pending_exceptions);
  43 }
  44
  45
  46 int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu)
  47 {
  48         enum emulation_result er;
  49         int r;
  50
  51         er = kvmppc_emulate_instruction(run, vcpu);
  52         switch (er) {
  53         case EMULATE_DONE:
  54                 /* Future optimization: only reload non-volatiles if they were
  55                  * actually modified. */
  56                 r = RESUME_GUEST_NV;
  57                 break;
  58         case EMULATE_DO_MMIO:
  59                 run->exit_reason = KVM_EXIT_MMIO;
  60                 /* We must reload nonvolatiles because "update" load/store
  61                  * instructions modify register state. */
  62                 /* Future optimization: only reload non-volatiles if they were
  63                  * actually modified. */
  64                 r = RESUME_HOST_NV;
  65                 break;
  66         case EMULATE_FAIL:
  67                 /* XXX Deliver Program interrupt to guest. */
  68                 printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__,
  69                        kvmppc_get_last_inst(vcpu));
  70                 r = RESUME_HOST;
  71                 break;
  72         default:
  73                 BUG();
  74         }
  75
  76         return r;
  77 }
  78
  79 int kvm_arch_hardware_enable(void *garbage)
  80 {
  81         return 0;
  82 }
  83
  84 void kvm_arch_hardware_disable(void *garbage)
  85 {
  86 }
  87
  88 int kvm_arch_hardware_setup(void)
  89 {
  90         return 0;
  91 }
  92
  93 void kvm_arch_hardware_unsetup(void)
  94 {
  95 }
  96
  97 void kvm_arch_check_processor_compat(void *rtn)
  98 {
  99         *(int *)rtn = kvmppc_core_check_processor_compat();
 100 }
 101
 102 struct kvm *kvm_arch_create_vm(void)
 103 {
 104         struct kvm *kvm;
 105
 106         kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
 107         if (!kvm)
 108                 return ERR_PTR(-ENOMEM);
 109
 110         return kvm;
 111 }
 112
 113 static void kvmppc_free_vcpus(struct kvm *kvm)
 114 {
 115         unsigned int i;
 116         struct kvm_vcpu *vcpu;
 117
 118         kvm_for_each_vcpu(i, vcpu, kvm)
 119                 kvm_arch_vcpu_free(vcpu);
 120
 121         mutex_lock(&kvm->lock);
 122         for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
 123                 kvm->vcpus[i] = NULL;
 124
 125         atomic_set(&kvm->online_vcpus, 0);
 126         mutex_unlock(&kvm->lock);
 127 }
 128
 129 void kvm_arch_sync_events(struct kvm *kvm)
 130 {
 131 }
 132
 133 void kvm_arch_destroy_vm(struct kvm *kvm)
 134 {
 135         kvmppc_free_vcpus(kvm);
 136         kvm_free_physmem(kvm);
 137         cleanup_srcu_struct(&kvm->srcu);
 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_PPC_SEGSTATE:
 147         case KVM_CAP_PPC_PAIRED_SINGLES:
 148         case KVM_CAP_PPC_UNSET_IRQ:
 149         case KVM_CAP_ENABLE_CAP:
 150         case KVM_CAP_PPC_OSI:
 151                 r = 1;
 152                 break;
 153         case KVM_CAP_COALESCED_MMIO:
 154                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 155                 break;
 156         default:
 157                 r = 0;
 158                 break;
 159         }
 160         return r;
 161
 162 }
 163
 164 long kvm_arch_dev_ioctl(struct file *filp,
 165                         unsigned int ioctl, unsigned long arg)
 166 {
 167         return -EINVAL;
 168 }
 169
 170 int kvm_arch_prepare_memory_region(struct kvm *kvm,
 171                                    struct kvm_memory_slot *memslot,
 172                                    struct kvm_memory_slot old,
 173                                    struct kvm_userspace_memory_region *mem,
 174                                    int user_alloc)
 175 {
 176         return 0;
 177 }
 178
 179 void kvm_arch_commit_memory_region(struct kvm *kvm,
 180                struct kvm_userspace_memory_region *mem,
 181                struct kvm_memory_slot old,
 182                int user_alloc)
 183 {
 184        return;
 185 }
 186
 187
 188 void kvm_arch_flush_shadow(struct kvm *kvm)
 189 {
 190 }
 191
 192 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 193 {
 194         struct kvm_vcpu *vcpu;
 195         vcpu = kvmppc_core_vcpu_create(kvm, id);
 196         if (!IS_ERR(vcpu))
 197                 kvmppc_create_vcpu_debugfs(vcpu, id);
 198         return vcpu;
 199 }
 200
 201 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 202 {
 203         /* Make sure we're not using the vcpu anymore */
 204         hrtimer_cancel(&vcpu->arch.dec_timer);
 205         tasklet_kill(&vcpu->arch.tasklet);
 206
 207         kvmppc_remove_vcpu_debugfs(vcpu);
 208         kvmppc_core_vcpu_free(vcpu);
 209 }
 210
 211 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 212 {
 213         kvm_arch_vcpu_free(vcpu);
 214 }
 215
 216 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 217 {
 218         return kvmppc_core_pending_dec(vcpu);
 219 }
 220
 221 static void kvmppc_decrementer_func(unsigned long data)
 222 {
 223         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
 224
 225         kvmppc_core_queue_dec(vcpu);
 226
 227         if (waitqueue_active(&vcpu->wq)) {
 228                 wake_up_interruptible(&vcpu->wq);
 229                 vcpu->stat.halt_wakeup++;
 230         }
 231 }
 232
 233 /*
 234  * low level hrtimer wake routine. Because this runs in hardirq context
 235  * we schedule a tasklet to do the real work.
 236  */
 237 enum hrtimer_restart kvmppc_decrementer_wakeup(struct hrtimer *timer)
 238 {
 239         struct kvm_vcpu *vcpu;
 240
 241         vcpu = container_of(timer, struct kvm_vcpu, arch.dec_timer);
 242         tasklet_schedule(&vcpu->arch.tasklet);
 243
 244         return HRTIMER_NORESTART;
 245 }
 246
 247 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 248 {
 249         hrtimer_init(&vcpu->arch.dec_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
 250         tasklet_init(&vcpu->arch.tasklet, kvmppc_decrementer_func, (ulong)vcpu);
 251         vcpu->arch.dec_timer.function = kvmppc_decrementer_wakeup;
 252
 253         return 0;
 254 }
 255
 256 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 257 {
 258         kvmppc_mmu_destroy(vcpu);
 259 }
 260
 261 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 262 {
 263         kvmppc_core_vcpu_load(vcpu, cpu);
 264 }
 265
 266 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 267 {
 268         kvmppc_core_vcpu_put(vcpu);
 269 }
 270
 271 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 272                                         struct kvm_guest_debug *dbg)
 273 {
 274         return -EINVAL;
 275 }
 276
 277 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
 278                                      struct kvm_run *run)
 279 {
 280         kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, run->dcr.data);
 281 }
 282
 283 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
 284                                       struct kvm_run *run)
 285 {
 286         u64 uninitialized_var(gpr);
 287
 288         if (run->mmio.len > sizeof(gpr)) {
 289                 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
 290                 return;
 291         }
 292
 293         if (vcpu->arch.mmio_is_bigendian) {
 294                 switch (run->mmio.len) {
 295                 case 8: gpr = *(u64 *)run->mmio.data; break;
 296                 case 4: gpr = *(u32 *)run->mmio.data; break;
 297                 case 2: gpr = *(u16 *)run->mmio.data; break;
 298                 case 1: gpr = *(u8 *)run->mmio.data; break;
 299                 }
 300         } else {
 301                 /* Convert BE data from userland back to LE. */
 302                 switch (run->mmio.len) {
 303                 case 4: gpr = ld_le32((u32 *)run->mmio.data); break;
 304                 case 2: gpr = ld_le16((u16 *)run->mmio.data); break;
 305                 case 1: gpr = *(u8 *)run->mmio.data; break;
 306                 }
 307         }
 308
 309         if (vcpu->arch.mmio_sign_extend) {
 310                 switch (run->mmio.len) {
 311 #ifdef CONFIG_PPC64
 312                 case 4:
 313                         gpr = (s64)(s32)gpr;
 314                         break;
 315 #endif
 316                 case 2:
 317                         gpr = (s64)(s16)gpr;
 318                         break;
 319                 case 1:
 320                         gpr = (s64)(s8)gpr;
 321                         break;
 322                 }
 323         }
 324
 325         kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
 326
 327         switch (vcpu->arch.io_gpr & KVM_REG_EXT_MASK) {
 328         case KVM_REG_GPR:
 329                 kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
 330                 break;
 331         case KVM_REG_FPR:
 332                 vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 333                 break;
 334 #ifdef CONFIG_PPC_BOOK3S
 335         case KVM_REG_QPR:
 336                 vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 337                 break;
 338         case KVM_REG_FQPR:
 339                 vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 340                 vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 341                 break;
 342 #endif
 343         default:
 344                 BUG();
 345         }
 346 }
 347
 348 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
 349                        unsigned int rt, unsigned int bytes, int is_bigendian)
 350 {
 351         if (bytes > sizeof(run->mmio.data)) {
 352                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 353                        run->mmio.len);
 354         }
 355
 356         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 357         run->mmio.len = bytes;
 358         run->mmio.is_write = 0;
 359
 360         vcpu->arch.io_gpr = rt;
 361         vcpu->arch.mmio_is_bigendian = is_bigendian;
 362         vcpu->mmio_needed = 1;
 363         vcpu->mmio_is_write = 0;
 364         vcpu->arch.mmio_sign_extend = 0;
 365
 366         return EMULATE_DO_MMIO;
 367 }
 368
 369 /* Same as above, but sign extends */
 370 int kvmppc_handle_loads(struct kvm_run *run, struct kvm_vcpu *vcpu,
 371                         unsigned int rt, unsigned int bytes, int is_bigendian)
 372 {
 373         int r;
 374
 375         r = kvmppc_handle_load(run, vcpu, rt, bytes, is_bigendian);
 376         vcpu->arch.mmio_sign_extend = 1;
 377
 378         return r;
 379 }
 380
 381 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
 382                         u64 val, unsigned int bytes, int is_bigendian)
 383 {
 384         void *data = run->mmio.data;
 385
 386         if (bytes > sizeof(run->mmio.data)) {
 387                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 388                        run->mmio.len);
 389         }
 390
 391         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 392         run->mmio.len = bytes;
 393         run->mmio.is_write = 1;
 394         vcpu->mmio_needed = 1;
 395         vcpu->mmio_is_write = 1;
 396
 397         /* Store the value at the lowest bytes in 'data'. */
 398         if (is_bigendian) {
 399                 switch (bytes) {
 400                 case 8: *(u64 *)data = val; break;
 401                 case 4: *(u32 *)data = val; break;
 402                 case 2: *(u16 *)data = val; break;
 403                 case 1: *(u8  *)data = val; break;
 404                 }
 405         } else {
 406                 /* Store LE value into 'data'. */
 407                 switch (bytes) {
 408                 case 4: st_le32(data, val); break;
 409                 case 2: st_le16(data, val); break;
 410                 case 1: *(u8 *)data = val; break;
 411                 }
 412         }
 413
 414         return EMULATE_DO_MMIO;
 415 }
 416
 417 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 418 {
 419         int r;
 420         sigset_t sigsaved;
 421
 422         if (vcpu->sigset_active)
 423                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 424
 425         if (vcpu->mmio_needed) {
 426                 if (!vcpu->mmio_is_write)
 427                         kvmppc_complete_mmio_load(vcpu, run);
 428                 vcpu->mmio_needed = 0;
 429         } else if (vcpu->arch.dcr_needed) {
 430                 if (!vcpu->arch.dcr_is_write)
 431                         kvmppc_complete_dcr_load(vcpu, run);
 432                 vcpu->arch.dcr_needed = 0;
 433         } else if (vcpu->arch.osi_needed) {
 434                 u64 *gprs = run->osi.gprs;
 435                 int i;
 436
 437                 for (i = 0; i < 32; i++)
 438                         kvmppc_set_gpr(vcpu, i, gprs[i]);
 439                 vcpu->arch.osi_needed = 0;
 440         }
 441
 442         kvmppc_core_deliver_interrupts(vcpu);
 443
 444         local_irq_disable();
 445         kvm_guest_enter();
 446         r = __kvmppc_vcpu_run(run, vcpu);
 447         kvm_guest_exit();
 448         local_irq_enable();
 449
 450         if (vcpu->sigset_active)
 451                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 452
 453         return r;
 454 }
 455
 456 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
 457 {
 458         if (irq->irq == KVM_INTERRUPT_UNSET)
 459                 kvmppc_core_dequeue_external(vcpu, irq);
 460         else
 461                 kvmppc_core_queue_external(vcpu, irq);
 462
 463         if (waitqueue_active(&vcpu->wq)) {
 464                 wake_up_interruptible(&vcpu->wq);
 465                 vcpu->stat.halt_wakeup++;
 466         }
 467
 468         return 0;
 469 }
 470
 471 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
 472                                      struct kvm_enable_cap *cap)
 473 {
 474         int r;
 475
 476         if (cap->flags)
 477                 return -EINVAL;
 478
 479         switch (cap->cap) {
 480         case KVM_CAP_PPC_OSI:
 481                 r = 0;
 482                 vcpu->arch.osi_enabled = true;
 483                 break;
 484         default:
 485                 r = -EINVAL;
 486                 break;
 487         }
 488
 489         return r;
 490 }
 491
 492 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 493                                     struct kvm_mp_state *mp_state)
 494 {
 495         return -EINVAL;
 496 }
 497
 498 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 499                                     struct kvm_mp_state *mp_state)
 500 {
 501         return -EINVAL;
 502 }
 503
 504 long kvm_arch_vcpu_ioctl(struct file *filp,
 505                          unsigned int ioctl, unsigned long arg)
 506 {
 507         struct kvm_vcpu *vcpu = filp->private_data;
 508         void __user *argp = (void __user *)arg;
 509         long r;
 510
 511         switch (ioctl) {
 512         case KVM_INTERRUPT: {
 513                 struct kvm_interrupt irq;
 514                 r = -EFAULT;
 515                 if (copy_from_user(&irq, argp, sizeof(irq)))
 516                         goto out;
 517                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 518                 goto out;
 519         }
 520
 521         case KVM_ENABLE_CAP:
 522         {
 523                 struct kvm_enable_cap cap;
 524                 r = -EFAULT;
 525                 if (copy_from_user(&cap, argp, sizeof(cap)))
 526                         goto out;
 527                 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
 528                 break;
 529         }
 530         default:
 531                 r = -EINVAL;
 532         }
 533
 534 out:
 535         return r;
 536 }
 537
 538 long kvm_arch_vm_ioctl(struct file *filp,
 539                        unsigned int ioctl, unsigned long arg)
 540 {
 541         long r;
 542
 543         switch (ioctl) {
 544         default:
 545                 r = -ENOTTY;
 546         }
 547
 548         return r;
 549 }
 550
 551 int kvm_arch_init(void *opaque)
 552 {
 553         return 0;
 554 }
 555
 556 void kvm_arch_exit(void)
 557 {
 558 }