arch/powerpc/kvm/book3s_hv.c

   1 /*
   2  * Copyright 2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
   3  * Copyright (C) 2009. SUSE Linux Products GmbH. All rights reserved.
   4  *
   5  * Authors:
   6  *    Paul Mackerras <paulus@au1.ibm.com>
   7  *    Alexander Graf <agraf@suse.de>
   8  *    Kevin Wolf <mail@kevin-wolf.de>
   9  *
  10  * Description: KVM functions specific to running on Book 3S
  11  * processors in hypervisor mode (specifically POWER7 and later).
  12  *
  13  * This file is derived from arch/powerpc/kvm/book3s.c,
  14  * by Alexander Graf <agraf@suse.de>.
  15  *
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License, version 2, as
  18  * published by the Free Software Foundation.
  19  */
  20
  21 #include <linux/kvm_host.h>
  22 #include <linux/err.h>
  23 #include <linux/slab.h>
  24 #include <linux/preempt.h>
  25 #include <linux/sched.h>
  26 #include <linux/delay.h>
  27 #include <linux/fs.h>
  28 #include <linux/anon_inodes.h>
  29 #include <linux/cpumask.h>
  30 #include <linux/spinlock.h>
  31 #include <linux/page-flags.h>
  32
  33 #include <asm/reg.h>
  34 #include <asm/cputable.h>
  35 #include <asm/cacheflush.h>
  36 #include <asm/tlbflush.h>
  37 #include <asm/uaccess.h>
  38 #include <asm/io.h>
  39 #include <asm/kvm_ppc.h>
  40 #include <asm/kvm_book3s.h>
  41 #include <asm/mmu_context.h>
  42 #include <asm/lppaca.h>
  43 #include <asm/processor.h>
  44 #include <asm/cputhreads.h>
  45 #include <asm/page.h>
  46 #include <linux/gfp.h>
  47 #include <linux/sched.h>
  48 #include <linux/vmalloc.h>
  49 #include <linux/highmem.h>
  50
  51 /*
  52  * For now, limit memory to 64GB and require it to be large pages.
  53  * This value is chosen because it makes the ram_pginfo array be
  54  * 64kB in size, which is about as large as we want to be trying
  55  * to allocate with kmalloc.
  56  */
  57 #define MAX_MEM_ORDER           36
  58
  59 #define LARGE_PAGE_ORDER        24      /* 16MB pages */
  60
  61 /* #define EXIT_DEBUG */
  62 /* #define EXIT_DEBUG_SIMPLE */
  63 /* #define EXIT_DEBUG_INT */
  64
  65 static void kvmppc_end_cede(struct kvm_vcpu *vcpu);
  66
  67 void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
  68 {
  69         local_paca->kvm_hstate.kvm_vcpu = vcpu;
  70         local_paca->kvm_hstate.kvm_vcore = vcpu->arch.vcore;
  71 }
  72
  73 void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
  74 {
  75 }
  76
  77 void kvmppc_set_msr(struct kvm_vcpu *vcpu, u64 msr)
  78 {
  79         vcpu->arch.shregs.msr = msr;
  80         kvmppc_end_cede(vcpu);
  81 }
  82
  83 void kvmppc_set_pvr(struct kvm_vcpu *vcpu, u32 pvr)
  84 {
  85         vcpu->arch.pvr = pvr;
  86 }
  87
  88 void kvmppc_dump_regs(struct kvm_vcpu *vcpu)
  89 {
  90         int r;
  91
  92         pr_err("vcpu %p (%d):\n", vcpu, vcpu->vcpu_id);
  93         pr_err("pc  = %.16lx  msr = %.16llx  trap = %x\n",
  94                vcpu->arch.pc, vcpu->arch.shregs.msr, vcpu->arch.trap);
  95         for (r = 0; r < 16; ++r)
  96                 pr_err("r%2d = %.16lx  r%d = %.16lx\n",
  97                        r, kvmppc_get_gpr(vcpu, r),
  98                        r+16, kvmppc_get_gpr(vcpu, r+16));
  99         pr_err("ctr = %.16lx  lr  = %.16lx\n",
 100                vcpu->arch.ctr, vcpu->arch.lr);
 101         pr_err("srr0 = %.16llx srr1 = %.16llx\n",
 102                vcpu->arch.shregs.srr0, vcpu->arch.shregs.srr1);
 103         pr_err("sprg0 = %.16llx sprg1 = %.16llx\n",
 104                vcpu->arch.shregs.sprg0, vcpu->arch.shregs.sprg1);
 105         pr_err("sprg2 = %.16llx sprg3 = %.16llx\n",
 106                vcpu->arch.shregs.sprg2, vcpu->arch.shregs.sprg3);
 107         pr_err("cr = %.8x  xer = %.16lx  dsisr = %.8x\n",
 108                vcpu->arch.cr, vcpu->arch.xer, vcpu->arch.shregs.dsisr);
 109         pr_err("dar = %.16llx\n", vcpu->arch.shregs.dar);
 110         pr_err("fault dar = %.16lx dsisr = %.8x\n",
 111                vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
 112         pr_err("SLB (%d entries):\n", vcpu->arch.slb_max);
 113         for (r = 0; r < vcpu->arch.slb_max; ++r)
 114                 pr_err("  ESID = %.16llx VSID = %.16llx\n",
 115                        vcpu->arch.slb[r].orige, vcpu->arch.slb[r].origv);
 116         pr_err("lpcr = %.16lx sdr1 = %.16lx last_inst = %.8x\n",
 117                vcpu->kvm->arch.lpcr, vcpu->kvm->arch.sdr1,
 118                vcpu->arch.last_inst);
 119 }
 120
 121 struct kvm_vcpu *kvmppc_find_vcpu(struct kvm *kvm, int id)
 122 {
 123         int r;
 124         struct kvm_vcpu *v, *ret = NULL;
 125
 126         mutex_lock(&kvm->lock);
 127         kvm_for_each_vcpu(r, v, kvm) {
 128                 if (v->vcpu_id == id) {
 129                         ret = v;
 130                         break;
 131                 }
 132         }
 133         mutex_unlock(&kvm->lock);
 134         return ret;
 135 }
 136
 137 static void init_vpa(struct kvm_vcpu *vcpu, struct lppaca *vpa)
 138 {
 139         vpa->shared_proc = 1;
 140         vpa->yield_count = 1;
 141 }
 142
 143 static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu,
 144                                        unsigned long flags,
 145                                        unsigned long vcpuid, unsigned long vpa)
 146 {
 147         struct kvm *kvm = vcpu->kvm;
 148         unsigned long pg_index, ra, len;
 149         unsigned long pg_offset;
 150         void *va;
 151         struct kvm_vcpu *tvcpu;
 152
 153         tvcpu = kvmppc_find_vcpu(kvm, vcpuid);
 154         if (!tvcpu)
 155                 return H_PARAMETER;
 156
 157         flags >>= 63 - 18;
 158         flags &= 7;
 159         if (flags == 0 || flags == 4)
 160                 return H_PARAMETER;
 161         if (flags < 4) {
 162                 if (vpa & 0x7f)
 163                         return H_PARAMETER;
 164                 /* registering new area; convert logical addr to real */
 165                 pg_index = vpa >> kvm->arch.ram_porder;
 166                 pg_offset = vpa & (kvm->arch.ram_psize - 1);
 167                 if (pg_index >= kvm->arch.ram_npages)
 168                         return H_PARAMETER;
 169                 if (kvm->arch.ram_pginfo[pg_index].pfn == 0)
 170                         return H_PARAMETER;
 171                 ra = kvm->arch.ram_pginfo[pg_index].pfn << PAGE_SHIFT;
 172                 ra |= pg_offset;
 173                 va = __va(ra);
 174                 if (flags <= 1)
 175                         len = *(unsigned short *)(va + 4);
 176                 else
 177                         len = *(unsigned int *)(va + 4);
 178                 if (pg_offset + len > kvm->arch.ram_psize)
 179                         return H_PARAMETER;
 180                 switch (flags) {
 181                 case 1:         /* register VPA */
 182                         if (len < 640)
 183                                 return H_PARAMETER;
 184                         tvcpu->arch.vpa = va;
 185                         init_vpa(vcpu, va);
 186                         break;
 187                 case 2:         /* register DTL */
 188                         if (len < 48)
 189                                 return H_PARAMETER;
 190                         if (!tvcpu->arch.vpa)
 191                                 return H_RESOURCE;
 192                         len -= len % 48;
 193                         tvcpu->arch.dtl = va;
 194                         tvcpu->arch.dtl_end = va + len;
 195                         break;
 196                 case 3:         /* register SLB shadow buffer */
 197                         if (len < 8)
 198                                 return H_PARAMETER;
 199                         if (!tvcpu->arch.vpa)
 200                                 return H_RESOURCE;
 201                         tvcpu->arch.slb_shadow = va;
 202                         len = (len - 16) / 16;
 203                         tvcpu->arch.slb_shadow = va;
 204                         break;
 205                 }
 206         } else {
 207                 switch (flags) {
 208                 case 5:         /* unregister VPA */
 209                         if (tvcpu->arch.slb_shadow || tvcpu->arch.dtl)
 210                                 return H_RESOURCE;
 211                         tvcpu->arch.vpa = NULL;
 212                         break;
 213                 case 6:         /* unregister DTL */
 214                         tvcpu->arch.dtl = NULL;
 215                         break;
 216                 case 7:         /* unregister SLB shadow buffer */
 217                         tvcpu->arch.slb_shadow = NULL;
 218                         break;
 219                 }
 220         }
 221         return H_SUCCESS;
 222 }
 223
 224 int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu)
 225 {
 226         unsigned long req = kvmppc_get_gpr(vcpu, 3);
 227         unsigned long target, ret = H_SUCCESS;
 228         struct kvm_vcpu *tvcpu;
 229
 230         switch (req) {
 231         case H_CEDE:
 232                 break;
 233         case H_PROD:
 234                 target = kvmppc_get_gpr(vcpu, 4);
 235                 tvcpu = kvmppc_find_vcpu(vcpu->kvm, target);
 236                 if (!tvcpu) {
 237                         ret = H_PARAMETER;
 238                         break;
 239                 }
 240                 tvcpu->arch.prodded = 1;
 241                 smp_mb();
 242                 if (vcpu->arch.ceded) {
 243                         if (waitqueue_active(&vcpu->wq)) {
 244                                 wake_up_interruptible(&vcpu->wq);
 245                                 vcpu->stat.halt_wakeup++;
 246                         }
 247                 }
 248                 break;
 249         case H_CONFER:
 250                 break;
 251         case H_REGISTER_VPA:
 252                 ret = do_h_register_vpa(vcpu, kvmppc_get_gpr(vcpu, 4),
 253                                         kvmppc_get_gpr(vcpu, 5),
 254                                         kvmppc_get_gpr(vcpu, 6));
 255                 break;
 256         default:
 257                 return RESUME_HOST;
 258         }
 259         kvmppc_set_gpr(vcpu, 3, ret);
 260         vcpu->arch.hcall_needed = 0;
 261         return RESUME_GUEST;
 262 }
 263
 264 static int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
 265                               struct task_struct *tsk)
 266 {
 267         int r = RESUME_HOST;
 268
 269         vcpu->stat.sum_exits++;
 270
 271         run->exit_reason = KVM_EXIT_UNKNOWN;
 272         run->ready_for_interrupt_injection = 1;
 273         switch (vcpu->arch.trap) {
 274         /* We're good on these - the host merely wanted to get our attention */
 275         case BOOK3S_INTERRUPT_HV_DECREMENTER:
 276                 vcpu->stat.dec_exits++;
 277                 r = RESUME_GUEST;
 278                 break;
 279         case BOOK3S_INTERRUPT_EXTERNAL:
 280                 vcpu->stat.ext_intr_exits++;
 281                 r = RESUME_GUEST;
 282                 break;
 283         case BOOK3S_INTERRUPT_PERFMON:
 284                 r = RESUME_GUEST;
 285                 break;
 286         case BOOK3S_INTERRUPT_PROGRAM:
 287         {
 288                 ulong flags;
 289                 /*
 290                  * Normally program interrupts are delivered directly
 291                  * to the guest by the hardware, but we can get here
 292                  * as a result of a hypervisor emulation interrupt
 293                  * (e40) getting turned into a 700 by BML RTAS.
 294                  */
 295                 flags = vcpu->arch.shregs.msr & 0x1f0000ull;
 296                 kvmppc_core_queue_program(vcpu, flags);
 297                 r = RESUME_GUEST;
 298                 break;
 299         }
 300         case BOOK3S_INTERRUPT_SYSCALL:
 301         {
 302                 /* hcall - punt to userspace */
 303                 int i;
 304
 305                 if (vcpu->arch.shregs.msr & MSR_PR) {
 306                         /* sc 1 from userspace - reflect to guest syscall */
 307                         kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_SYSCALL);
 308                         r = RESUME_GUEST;
 309                         break;
 310                 }
 311                 run->papr_hcall.nr = kvmppc_get_gpr(vcpu, 3);
 312                 for (i = 0; i < 9; ++i)
 313                         run->papr_hcall.args[i] = kvmppc_get_gpr(vcpu, 4 + i);
 314                 run->exit_reason = KVM_EXIT_PAPR_HCALL;
 315                 vcpu->arch.hcall_needed = 1;
 316                 r = RESUME_HOST;
 317                 break;
 318         }
 319         /*
 320          * We get these next two if the guest does a bad real-mode access,
 321          * as we have enabled VRMA (virtualized real mode area) mode in the
 322          * LPCR.  We just generate an appropriate DSI/ISI to the guest.
 323          */
 324         case BOOK3S_INTERRUPT_H_DATA_STORAGE:
 325                 vcpu->arch.shregs.dsisr = vcpu->arch.fault_dsisr;
 326                 vcpu->arch.shregs.dar = vcpu->arch.fault_dar;
 327                 kvmppc_inject_interrupt(vcpu, BOOK3S_INTERRUPT_DATA_STORAGE, 0);
 328                 r = RESUME_GUEST;
 329                 break;
 330         case BOOK3S_INTERRUPT_H_INST_STORAGE:
 331                 kvmppc_inject_interrupt(vcpu, BOOK3S_INTERRUPT_INST_STORAGE,
 332                                         0x08000000);
 333                 r = RESUME_GUEST;
 334                 break;
 335         /*
 336          * This occurs if the guest executes an illegal instruction.
 337          * We just generate a program interrupt to the guest, since
 338          * we don't emulate any guest instructions at this stage.
 339          */
 340         case BOOK3S_INTERRUPT_H_EMUL_ASSIST:
 341                 kvmppc_core_queue_program(vcpu, 0x80000);
 342                 r = RESUME_GUEST;
 343                 break;
 344         default:
 345                 kvmppc_dump_regs(vcpu);
 346                 printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n",
 347                         vcpu->arch.trap, kvmppc_get_pc(vcpu),
 348                         vcpu->arch.shregs.msr);
 349                 r = RESUME_HOST;
 350                 BUG();
 351                 break;
 352         }
 353
 354         return r;
 355 }
 356
 357 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
 358                                   struct kvm_sregs *sregs)
 359 {
 360         int i;
 361
 362         sregs->pvr = vcpu->arch.pvr;
 363
 364         memset(sregs, 0, sizeof(struct kvm_sregs));
 365         for (i = 0; i < vcpu->arch.slb_max; i++) {
 366                 sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige;
 367                 sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv;
 368         }
 369
 370         return 0;
 371 }
 372
 373 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 374                                   struct kvm_sregs *sregs)
 375 {
 376         int i, j;
 377
 378         kvmppc_set_pvr(vcpu, sregs->pvr);
 379
 380         j = 0;
 381         for (i = 0; i < vcpu->arch.slb_nr; i++) {
 382                 if (sregs->u.s.ppc64.slb[i].slbe & SLB_ESID_V) {
 383                         vcpu->arch.slb[j].orige = sregs->u.s.ppc64.slb[i].slbe;
 384                         vcpu->arch.slb[j].origv = sregs->u.s.ppc64.slb[i].slbv;
 385                         ++j;
 386                 }
 387         }
 388         vcpu->arch.slb_max = j;
 389
 390         return 0;
 391 }
 392
 393 int kvmppc_core_check_processor_compat(void)
 394 {
 395         if (cpu_has_feature(CPU_FTR_HVMODE))
 396                 return 0;
 397         return -EIO;
 398 }
 399
 400 struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
 401 {
 402         struct kvm_vcpu *vcpu;
 403         int err = -EINVAL;
 404         int core;
 405         struct kvmppc_vcore *vcore;
 406
 407         core = id / threads_per_core;
 408         if (core >= KVM_MAX_VCORES)
 409                 goto out;
 410
 411         err = -ENOMEM;
 412         vcpu = kzalloc(sizeof(struct kvm_vcpu), GFP_KERNEL);
 413         if (!vcpu)
 414                 goto out;
 415
 416         err = kvm_vcpu_init(vcpu, kvm, id);
 417         if (err)
 418                 goto free_vcpu;
 419
 420         vcpu->arch.shared = &vcpu->arch.shregs;
 421         vcpu->arch.last_cpu = -1;
 422         vcpu->arch.mmcr[0] = MMCR0_FC;
 423         vcpu->arch.ctrl = CTRL_RUNLATCH;
 424         /* default to host PVR, since we can't spoof it */
 425         vcpu->arch.pvr = mfspr(SPRN_PVR);
 426         kvmppc_set_pvr(vcpu, vcpu->arch.pvr);
 427
 428         kvmppc_mmu_book3s_hv_init(vcpu);
 429
 430         /*
 431          * We consider the vcpu stopped until we see the first run ioctl for it.
 432          */
 433         vcpu->arch.state = KVMPPC_VCPU_STOPPED;
 434
 435         init_waitqueue_head(&vcpu->arch.cpu_run);
 436
 437         mutex_lock(&kvm->lock);
 438         vcore = kvm->arch.vcores[core];
 439         if (!vcore) {
 440                 vcore = kzalloc(sizeof(struct kvmppc_vcore), GFP_KERNEL);
 441                 if (vcore) {
 442                         INIT_LIST_HEAD(&vcore->runnable_threads);
 443                         spin_lock_init(&vcore->lock);
 444                         init_waitqueue_head(&vcore->wq);
 445                 }
 446                 kvm->arch.vcores[core] = vcore;
 447         }
 448         mutex_unlock(&kvm->lock);
 449
 450         if (!vcore)
 451                 goto free_vcpu;
 452
 453         spin_lock(&vcore->lock);
 454         ++vcore->num_threads;
 455         spin_unlock(&vcore->lock);
 456         vcpu->arch.vcore = vcore;
 457
 458         vcpu->arch.cpu_type = KVM_CPU_3S_64;
 459         kvmppc_sanity_check(vcpu);
 460
 461         return vcpu;
 462
 463 free_vcpu:
 464         kfree(vcpu);
 465 out:
 466         return ERR_PTR(err);
 467 }
 468
 469 void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
 470 {
 471         kvm_vcpu_uninit(vcpu);
 472         kfree(vcpu);
 473 }
 474
 475 static void kvmppc_set_timer(struct kvm_vcpu *vcpu)
 476 {
 477         unsigned long dec_nsec, now;
 478
 479         now = get_tb();
 480         if (now > vcpu->arch.dec_expires) {
 481                 /* decrementer has already gone negative */
 482                 kvmppc_core_queue_dec(vcpu);
 483                 kvmppc_core_deliver_interrupts(vcpu);
 484                 return;
 485         }
 486         dec_nsec = (vcpu->arch.dec_expires - now) * NSEC_PER_SEC
 487                    / tb_ticks_per_sec;
 488         hrtimer_start(&vcpu->arch.dec_timer, ktime_set(0, dec_nsec),
 489                       HRTIMER_MODE_REL);
 490         vcpu->arch.timer_running = 1;
 491 }
 492
 493 static void kvmppc_end_cede(struct kvm_vcpu *vcpu)
 494 {
 495         vcpu->arch.ceded = 0;
 496         if (vcpu->arch.timer_running) {
 497                 hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
 498                 vcpu->arch.timer_running = 0;
 499         }
 500 }
 501
 502 extern int __kvmppc_vcore_entry(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu);
 503 extern void xics_wake_cpu(int cpu);
 504
 505 static void kvmppc_remove_runnable(struct kvmppc_vcore *vc,
 506                                    struct kvm_vcpu *vcpu)
 507 {
 508         struct kvm_vcpu *v;
 509
 510         if (vcpu->arch.state != KVMPPC_VCPU_RUNNABLE)
 511                 return;
 512         vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
 513         --vc->n_runnable;
 514         ++vc->n_busy;
 515         /* decrement the physical thread id of each following vcpu */
 516         v = vcpu;
 517         list_for_each_entry_continue(v, &vc->runnable_threads, arch.run_list)
 518                 --v->arch.ptid;
 519         list_del(&vcpu->arch.run_list);
 520 }
 521
 522 static void kvmppc_start_thread(struct kvm_vcpu *vcpu)
 523 {
 524         int cpu;
 525         struct paca_struct *tpaca;
 526         struct kvmppc_vcore *vc = vcpu->arch.vcore;
 527
 528         if (vcpu->arch.timer_running) {
 529                 hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
 530                 vcpu->arch.timer_running = 0;
 531         }
 532         cpu = vc->pcpu + vcpu->arch.ptid;
 533         tpaca = &paca[cpu];
 534         tpaca->kvm_hstate.kvm_vcpu = vcpu;
 535         tpaca->kvm_hstate.kvm_vcore = vc;
 536         tpaca->kvm_hstate.napping = 0;
 537         vcpu->cpu = vc->pcpu;
 538         smp_wmb();
 539 #ifdef CONFIG_PPC_ICP_NATIVE
 540         if (vcpu->arch.ptid) {
 541                 tpaca->cpu_start = 0x80;
 542                 wmb();
 543                 xics_wake_cpu(cpu);
 544                 ++vc->n_woken;
 545         }
 546 #endif
 547 }
 548
 549 static void kvmppc_wait_for_nap(struct kvmppc_vcore *vc)
 550 {
 551         int i;
 552
 553         HMT_low();
 554         i = 0;
 555         while (vc->nap_count < vc->n_woken) {
 556                 if (++i >= 1000000) {
 557                         pr_err("kvmppc_wait_for_nap timeout %d %d\n",
 558                                vc->nap_count, vc->n_woken);
 559                         break;
 560                 }
 561                 cpu_relax();
 562         }
 563         HMT_medium();
 564 }
 565
 566 /*
 567  * Check that we are on thread 0 and that any other threads in
 568  * this core are off-line.
 569  */
 570 static int on_primary_thread(void)
 571 {
 572         int cpu = smp_processor_id();
 573         int thr = cpu_thread_in_core(cpu);
 574
 575         if (thr)
 576                 return 0;
 577         while (++thr < threads_per_core)
 578                 if (cpu_online(cpu + thr))
 579                         return 0;
 580         return 1;
 581 }
 582
 583 /*
 584  * Run a set of guest threads on a physical core.
 585  * Called with vc->lock held.
 586  */
 587 static int kvmppc_run_core(struct kvmppc_vcore *vc)
 588 {
 589         struct kvm_vcpu *vcpu, *vcpu0, *vnext;
 590         long ret;
 591         u64 now;
 592         int ptid;
 593
 594         /* don't start if any threads have a signal pending */
 595         list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
 596                 if (signal_pending(vcpu->arch.run_task))
 597                         return 0;
 598
 599         /*
 600          * Make sure we are running on thread 0, and that
 601          * secondary threads are offline.
 602          * XXX we should also block attempts to bring any
 603          * secondary threads online.
 604          */
 605         if (threads_per_core > 1 && !on_primary_thread()) {
 606                 list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
 607                         vcpu->arch.ret = -EBUSY;
 608                 goto out;
 609         }
 610
 611         /*
 612          * Assign physical thread IDs, first to non-ceded vcpus
 613          * and then to ceded ones.
 614          */
 615         ptid = 0;
 616         vcpu0 = NULL;
 617         list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) {
 618                 if (!vcpu->arch.ceded) {
 619                         if (!ptid)
 620                                 vcpu0 = vcpu;
 621                         vcpu->arch.ptid = ptid++;
 622                 }
 623         }
 624         if (!vcpu0)
 625                 return 0;               /* nothing to run */
 626         list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
 627                 if (vcpu->arch.ceded)
 628                         vcpu->arch.ptid = ptid++;
 629
 630         vc->n_woken = 0;
 631         vc->nap_count = 0;
 632         vc->entry_exit_count = 0;
 633         vc->vcore_state = VCORE_RUNNING;
 634         vc->in_guest = 0;
 635         vc->pcpu = smp_processor_id();
 636         vc->napping_threads = 0;
 637         list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
 638                 kvmppc_start_thread(vcpu);
 639
 640         preempt_disable();
 641         spin_unlock(&vc->lock);
 642
 643         kvm_guest_enter();
 644         __kvmppc_vcore_entry(NULL, vcpu0);
 645
 646         spin_lock(&vc->lock);
 647         /* disable sending of IPIs on virtual external irqs */
 648         list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
 649                 vcpu->cpu = -1;
 650         /* wait for secondary threads to finish writing their state to memory */
 651         if (vc->nap_count < vc->n_woken)
 652                 kvmppc_wait_for_nap(vc);
 653         /* prevent other vcpu threads from doing kvmppc_start_thread() now */
 654         vc->vcore_state = VCORE_EXITING;
 655         spin_unlock(&vc->lock);
 656
 657         /* make sure updates to secondary vcpu structs are visible now */
 658         smp_mb();
 659         kvm_guest_exit();
 660
 661         preempt_enable();
 662         kvm_resched(vcpu);
 663
 664         now = get_tb();
 665         list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) {
 666                 /* cancel pending dec exception if dec is positive */
 667                 if (now < vcpu->arch.dec_expires &&
 668                     kvmppc_core_pending_dec(vcpu))
 669                         kvmppc_core_dequeue_dec(vcpu);
 670
 671                 ret = RESUME_GUEST;
 672                 if (vcpu->arch.trap)
 673                         ret = kvmppc_handle_exit(vcpu->arch.kvm_run, vcpu,
 674                                                  vcpu->arch.run_task);
 675
 676                 vcpu->arch.ret = ret;
 677                 vcpu->arch.trap = 0;
 678
 679                 if (vcpu->arch.ceded) {
 680                         if (ret != RESUME_GUEST)
 681                                 kvmppc_end_cede(vcpu);
 682                         else
 683                                 kvmppc_set_timer(vcpu);
 684                 }
 685         }
 686
 687         spin_lock(&vc->lock);
 688  out:
 689         vc->vcore_state = VCORE_INACTIVE;
 690         list_for_each_entry_safe(vcpu, vnext, &vc->runnable_threads,
 691                                  arch.run_list) {
 692                 if (vcpu->arch.ret != RESUME_GUEST) {
 693                         kvmppc_remove_runnable(vc, vcpu);
 694                         wake_up(&vcpu->arch.cpu_run);
 695                 }
 696         }
 697
 698         return 1;
 699 }
 700
 701 /*
 702  * Wait for some other vcpu thread to execute us, and
 703  * wake us up when we need to handle something in the host.
 704  */
 705 static void kvmppc_wait_for_exec(struct kvm_vcpu *vcpu, int wait_state)
 706 {
 707         DEFINE_WAIT(wait);
 708
 709         prepare_to_wait(&vcpu->arch.cpu_run, &wait, wait_state);
 710         if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE)
 711                 schedule();
 712         finish_wait(&vcpu->arch.cpu_run, &wait);
 713 }
 714
 715 /*
 716  * All the vcpus in this vcore are idle, so wait for a decrementer
 717  * or external interrupt to one of the vcpus.  vc->lock is held.
 718  */
 719 static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
 720 {
 721         DEFINE_WAIT(wait);
 722         struct kvm_vcpu *v;
 723         int all_idle = 1;
 724
 725         prepare_to_wait(&vc->wq, &wait, TASK_INTERRUPTIBLE);
 726         vc->vcore_state = VCORE_SLEEPING;
 727         spin_unlock(&vc->lock);
 728         list_for_each_entry(v, &vc->runnable_threads, arch.run_list) {
 729                 if (!v->arch.ceded || v->arch.pending_exceptions) {
 730                         all_idle = 0;
 731                         break;
 732                 }
 733         }
 734         if (all_idle)
 735                 schedule();
 736         finish_wait(&vc->wq, &wait);
 737         spin_lock(&vc->lock);
 738         vc->vcore_state = VCORE_INACTIVE;
 739 }
 740
 741 static int kvmppc_run_vcpu(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
 742 {
 743         int n_ceded;
 744         int prev_state;
 745         struct kvmppc_vcore *vc;
 746         struct kvm_vcpu *v, *vn;
 747
 748         kvm_run->exit_reason = 0;
 749         vcpu->arch.ret = RESUME_GUEST;
 750         vcpu->arch.trap = 0;
 751
 752         /*
 753          * Synchronize with other threads in this virtual core
 754          */
 755         vc = vcpu->arch.vcore;
 756         spin_lock(&vc->lock);
 757         vcpu->arch.ceded = 0;
 758         vcpu->arch.run_task = current;
 759         vcpu->arch.kvm_run = kvm_run;
 760         prev_state = vcpu->arch.state;
 761         vcpu->arch.state = KVMPPC_VCPU_RUNNABLE;
 762         list_add_tail(&vcpu->arch.run_list, &vc->runnable_threads);
 763         ++vc->n_runnable;
 764
 765         /*
 766          * This happens the first time this is called for a vcpu.
 767          * If the vcore is already running, we may be able to start
 768          * this thread straight away and have it join in.
 769          */
 770         if (prev_state == KVMPPC_VCPU_STOPPED) {
 771                 if (vc->vcore_state == VCORE_RUNNING &&
 772                     VCORE_EXIT_COUNT(vc) == 0) {
 773                         vcpu->arch.ptid = vc->n_runnable - 1;
 774                         kvmppc_start_thread(vcpu);
 775                 }
 776
 777         } else if (prev_state == KVMPPC_VCPU_BUSY_IN_HOST)
 778                 --vc->n_busy;
 779
 780         while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE &&
 781                !signal_pending(current)) {
 782                 if (vc->n_busy || vc->vcore_state != VCORE_INACTIVE) {
 783                         spin_unlock(&vc->lock);
 784                         kvmppc_wait_for_exec(vcpu, TASK_INTERRUPTIBLE);
 785                         spin_lock(&vc->lock);
 786                         continue;
 787                 }
 788                 n_ceded = 0;
 789                 list_for_each_entry(v, &vc->runnable_threads, arch.run_list)
 790                         n_ceded += v->arch.ceded;
 791                 if (n_ceded == vc->n_runnable)
 792                         kvmppc_vcore_blocked(vc);
 793                 else
 794                         kvmppc_run_core(vc);
 795
 796                 list_for_each_entry_safe(v, vn, &vc->runnable_threads,
 797                                          arch.run_list) {
 798                         kvmppc_core_deliver_interrupts(v);
 799                         if (signal_pending(v->arch.run_task)) {
 800                                 kvmppc_remove_runnable(vc, v);
 801                                 v->stat.signal_exits++;
 802                                 v->arch.kvm_run->exit_reason = KVM_EXIT_INTR;
 803                                 v->arch.ret = -EINTR;
 804                                 wake_up(&v->arch.cpu_run);
 805                         }
 806                 }
 807         }
 808
 809         if (signal_pending(current)) {
 810                 if (vc->vcore_state == VCORE_RUNNING ||
 811                     vc->vcore_state == VCORE_EXITING) {
 812                         spin_unlock(&vc->lock);
 813                         kvmppc_wait_for_exec(vcpu, TASK_UNINTERRUPTIBLE);
 814                         spin_lock(&vc->lock);
 815                 }
 816                 if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) {
 817                         kvmppc_remove_runnable(vc, vcpu);
 818                         vcpu->stat.signal_exits++;
 819                         kvm_run->exit_reason = KVM_EXIT_INTR;
 820                         vcpu->arch.ret = -EINTR;
 821                 }
 822         }
 823
 824         spin_unlock(&vc->lock);
 825         return vcpu->arch.ret;
 826 }
 827
 828 int kvmppc_vcpu_run(struct kvm_run *run, struct kvm_vcpu *vcpu)
 829 {
 830         int r;
 831
 832         if (!vcpu->arch.sane) {
 833                 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
 834                 return -EINVAL;
 835         }
 836
 837         /* No need to go into the guest when all we'll do is come back out */
 838         if (signal_pending(current)) {
 839                 run->exit_reason = KVM_EXIT_INTR;
 840                 return -EINTR;
 841         }
 842
 843         /* On PPC970, check that we have an RMA region */
 844         if (!vcpu->kvm->arch.rma && cpu_has_feature(CPU_FTR_ARCH_201))
 845                 return -EPERM;
 846
 847         flush_fp_to_thread(current);
 848         flush_altivec_to_thread(current);
 849         flush_vsx_to_thread(current);
 850         vcpu->arch.wqp = &vcpu->arch.vcore->wq;
 851
 852         do {
 853                 r = kvmppc_run_vcpu(run, vcpu);
 854
 855                 if (run->exit_reason == KVM_EXIT_PAPR_HCALL &&
 856                     !(vcpu->arch.shregs.msr & MSR_PR)) {
 857                         r = kvmppc_pseries_do_hcall(vcpu);
 858                         kvmppc_core_deliver_interrupts(vcpu);
 859                 }
 860         } while (r == RESUME_GUEST);
 861         return r;
 862 }
 863
 864 static long kvmppc_stt_npages(unsigned long window_size)
 865 {
 866         return ALIGN((window_size >> SPAPR_TCE_SHIFT)
 867                      * sizeof(u64), PAGE_SIZE) / PAGE_SIZE;
 868 }
 869
 870 static void release_spapr_tce_table(struct kvmppc_spapr_tce_table *stt)
 871 {
 872         struct kvm *kvm = stt->kvm;
 873         int i;
 874
 875         mutex_lock(&kvm->lock);
 876         list_del(&stt->list);
 877         for (i = 0; i < kvmppc_stt_npages(stt->window_size); i++)
 878                 __free_page(stt->pages[i]);
 879         kfree(stt);
 880         mutex_unlock(&kvm->lock);
 881
 882         kvm_put_kvm(kvm);
 883 }
 884
 885 static int kvm_spapr_tce_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 886 {
 887         struct kvmppc_spapr_tce_table *stt = vma->vm_file->private_data;
 888         struct page *page;
 889
 890         if (vmf->pgoff >= kvmppc_stt_npages(stt->window_size))
 891                 return VM_FAULT_SIGBUS;
 892
 893         page = stt->pages[vmf->pgoff];
 894         get_page(page);
 895         vmf->page = page;
 896         return 0;
 897 }
 898
 899 static const struct vm_operations_struct kvm_spapr_tce_vm_ops = {
 900         .fault = kvm_spapr_tce_fault,
 901 };
 902
 903 static int kvm_spapr_tce_mmap(struct file *file, struct vm_area_struct *vma)
 904 {
 905         vma->vm_ops = &kvm_spapr_tce_vm_ops;
 906         return 0;
 907 }
 908
 909 static int kvm_spapr_tce_release(struct inode *inode, struct file *filp)
 910 {
 911         struct kvmppc_spapr_tce_table *stt = filp->private_data;
 912
 913         release_spapr_tce_table(stt);
 914         return 0;
 915 }
 916
 917 static struct file_operations kvm_spapr_tce_fops = {
 918         .mmap           = kvm_spapr_tce_mmap,
 919         .release        = kvm_spapr_tce_release,
 920 };
 921
 922 long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm,
 923                                    struct kvm_create_spapr_tce *args)
 924 {
 925         struct kvmppc_spapr_tce_table *stt = NULL;
 926         long npages;
 927         int ret = -ENOMEM;
 928         int i;
 929
 930         /* Check this LIOBN hasn't been previously allocated */
 931         list_for_each_entry(stt, &kvm->arch.spapr_tce_tables, list) {
 932                 if (stt->liobn == args->liobn)
 933                         return -EBUSY;
 934         }
 935
 936         npages = kvmppc_stt_npages(args->window_size);
 937
 938         stt = kzalloc(sizeof(*stt) + npages* sizeof(struct page *),
 939                       GFP_KERNEL);
 940         if (!stt)
 941                 goto fail;
 942
 943         stt->liobn = args->liobn;
 944         stt->window_size = args->window_size;
 945         stt->kvm = kvm;
 946
 947         for (i = 0; i < npages; i++) {
 948                 stt->pages[i] = alloc_page(GFP_KERNEL | __GFP_ZERO);
 949                 if (!stt->pages[i])
 950                         goto fail;
 951         }
 952
 953         kvm_get_kvm(kvm);
 954
 955         mutex_lock(&kvm->lock);
 956         list_add(&stt->list, &kvm->arch.spapr_tce_tables);
 957
 958         mutex_unlock(&kvm->lock);
 959
 960         return anon_inode_getfd("kvm-spapr-tce", &kvm_spapr_tce_fops,
 961                                 stt, O_RDWR);
 962
 963 fail:
 964         if (stt) {
 965                 for (i = 0; i < npages; i++)
 966                         if (stt->pages[i])
 967                                 __free_page(stt->pages[i]);
 968
 969                 kfree(stt);
 970         }
 971         return ret;
 972 }
 973
 974 /* Work out RMLS (real mode limit selector) field value for a given RMA size.
 975    Assumes POWER7 or PPC970. */
 976 static inline int lpcr_rmls(unsigned long rma_size)
 977 {
 978         switch (rma_size) {
 979         case 32ul << 20:        /* 32 MB */
 980                 if (cpu_has_feature(CPU_FTR_ARCH_206))
 981                         return 8;       /* only supported on POWER7 */
 982                 return -1;
 983         case 64ul << 20:        /* 64 MB */
 984                 return 3;
 985         case 128ul << 20:       /* 128 MB */
 986                 return 7;
 987         case 256ul << 20:       /* 256 MB */
 988                 return 4;
 989         case 1ul << 30:         /* 1 GB */
 990                 return 2;
 991         case 16ul << 30:        /* 16 GB */
 992                 return 1;
 993         case 256ul << 30:       /* 256 GB */
 994                 return 0;
 995         default:
 996                 return -1;
 997         }
 998 }
 999
1000 static int kvm_rma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1001 {
1002         struct kvmppc_rma_info *ri = vma->vm_file->private_data;
1003         struct page *page;
1004
1005         if (vmf->pgoff >= ri->npages)
1006                 return VM_FAULT_SIGBUS;
1007
1008         page = pfn_to_page(ri->base_pfn + vmf->pgoff);
1009         get_page(page);
1010         vmf->page = page;
1011         return 0;
1012 }
1013
1014 static const struct vm_operations_struct kvm_rma_vm_ops = {
1015         .fault = kvm_rma_fault,
1016 };
1017
1018 static int kvm_rma_mmap(struct file *file, struct vm_area_struct *vma)
1019 {
1020         vma->vm_flags |= VM_RESERVED;
1021         vma->vm_ops = &kvm_rma_vm_ops;
1022         return 0;
1023 }
1024
1025 static int kvm_rma_release(struct inode *inode, struct file *filp)
1026 {
1027         struct kvmppc_rma_info *ri = filp->private_data;
1028
1029         kvm_release_rma(ri);
1030         return 0;
1031 }
1032
1033 static struct file_operations kvm_rma_fops = {
1034         .mmap           = kvm_rma_mmap,
1035         .release        = kvm_rma_release,
1036 };
1037
1038 long kvm_vm_ioctl_allocate_rma(struct kvm *kvm, struct kvm_allocate_rma *ret)
1039 {
1040         struct kvmppc_rma_info *ri;
1041         long fd;
1042
1043         ri = kvm_alloc_rma();
1044         if (!ri)
1045                 return -ENOMEM;
1046
1047         fd = anon_inode_getfd("kvm-rma", &kvm_rma_fops, ri, O_RDWR);
1048         if (fd < 0)
1049                 kvm_release_rma(ri);
1050
1051         ret->rma_size = ri->npages << PAGE_SHIFT;
1052         return fd;
1053 }
1054
1055 static struct page *hva_to_page(unsigned long addr)
1056 {
1057         struct page *page[1];
1058         int npages;
1059
1060         might_sleep();
1061
1062         npages = get_user_pages_fast(addr, 1, 1, page);
1063
1064         if (unlikely(npages != 1))
1065                 return 0;
1066
1067         return page[0];
1068 }
1069
1070 int kvmppc_core_prepare_memory_region(struct kvm *kvm,
1071                                 struct kvm_userspace_memory_region *mem)
1072 {
1073         unsigned long psize, porder;
1074         unsigned long i, npages, totalpages;
1075         unsigned long pg_ix;
1076         struct kvmppc_pginfo *pginfo;
1077         unsigned long hva;
1078         struct kvmppc_rma_info *ri = NULL;
1079         struct page *page;
1080
1081         /* For now, only allow 16MB pages */
1082         porder = LARGE_PAGE_ORDER;
1083         psize = 1ul << porder;
1084         if ((mem->memory_size & (psize - 1)) ||
1085             (mem->guest_phys_addr & (psize - 1))) {
1086                 pr_err("bad memory_size=%llx @ %llx\n",
1087                        mem->memory_size, mem->guest_phys_addr);
1088                 return -EINVAL;
1089         }
1090
1091         npages = mem->memory_size >> porder;
1092         totalpages = (mem->guest_phys_addr + mem->memory_size) >> porder;
1093
1094         /* More memory than we have space to track? */
1095         if (totalpages > (1ul << (MAX_MEM_ORDER - LARGE_PAGE_ORDER)))
1096                 return -EINVAL;
1097
1098         /* Do we already have an RMA registered? */
1099         if (mem->guest_phys_addr == 0 && kvm->arch.rma)
1100                 return -EINVAL;
1101
1102         if (totalpages > kvm->arch.ram_npages)
1103                 kvm->arch.ram_npages = totalpages;
1104
1105         /* Is this one of our preallocated RMAs? */
1106         if (mem->guest_phys_addr == 0) {
1107                 struct vm_area_struct *vma;
1108
1109                 down_read(&current->mm->mmap_sem);
1110                 vma = find_vma(current->mm, mem->userspace_addr);
1111                 if (vma && vma->vm_file &&
1112                     vma->vm_file->f_op == &kvm_rma_fops &&
1113                     mem->userspace_addr == vma->vm_start)
1114                         ri = vma->vm_file->private_data;
1115                 up_read(&current->mm->mmap_sem);
1116                 if (!ri && cpu_has_feature(CPU_FTR_ARCH_201)) {
1117                         pr_err("CPU requires an RMO\n");
1118                         return -EINVAL;
1119                 }
1120         }
1121
1122         if (ri) {
1123                 unsigned long rma_size;
1124                 unsigned long lpcr;
1125                 long rmls;
1126
1127                 rma_size = ri->npages << PAGE_SHIFT;
1128                 if (rma_size > mem->memory_size)
1129                         rma_size = mem->memory_size;
1130                 rmls = lpcr_rmls(rma_size);
1131                 if (rmls < 0) {
1132                         pr_err("Can't use RMA of 0x%lx bytes\n", rma_size);
1133                         return -EINVAL;
1134                 }
1135                 atomic_inc(&ri->use_count);
1136                 kvm->arch.rma = ri;
1137                 kvm->arch.n_rma_pages = rma_size >> porder;
1138
1139                 /* Update LPCR and RMOR */
1140                 lpcr = kvm->arch.lpcr;
1141                 if (cpu_has_feature(CPU_FTR_ARCH_201)) {
1142                         /* PPC970; insert RMLS value (split field) in HID4 */
1143                         lpcr &= ~((1ul << HID4_RMLS0_SH) |
1144                                   (3ul << HID4_RMLS2_SH));
1145                         lpcr |= ((rmls >> 2) << HID4_RMLS0_SH) |
1146                                 ((rmls & 3) << HID4_RMLS2_SH);
1147                         /* RMOR is also in HID4 */
1148                         lpcr |= ((ri->base_pfn >> (26 - PAGE_SHIFT)) & 0xffff)
1149                                 << HID4_RMOR_SH;
1150                 } else {
1151                         /* POWER7 */
1152                         lpcr &= ~(LPCR_VPM0 | LPCR_VRMA_L);
1153                         lpcr |= rmls << LPCR_RMLS_SH;
1154                         kvm->arch.rmor = kvm->arch.rma->base_pfn << PAGE_SHIFT;
1155                 }
1156                 kvm->arch.lpcr = lpcr;
1157                 pr_info("Using RMO at %lx size %lx (LPCR = %lx)\n",
1158                         ri->base_pfn << PAGE_SHIFT, rma_size, lpcr);
1159         }
1160
1161         pg_ix = mem->guest_phys_addr >> porder;
1162         pginfo = kvm->arch.ram_pginfo + pg_ix;
1163         for (i = 0; i < npages; ++i, ++pg_ix) {
1164                 if (ri && pg_ix < kvm->arch.n_rma_pages) {
1165                         pginfo[i].pfn = ri->base_pfn +
1166                                 (pg_ix << (porder - PAGE_SHIFT));
1167                         continue;
1168                 }
1169                 hva = mem->userspace_addr + (i << porder);
1170                 page = hva_to_page(hva);
1171                 if (!page) {
1172                         pr_err("oops, no pfn for hva %lx\n", hva);
1173                         goto err;
1174                 }
1175                 /* Check it's a 16MB page */
1176                 if (!PageHead(page) ||
1177                     compound_order(page) != (LARGE_PAGE_ORDER - PAGE_SHIFT)) {
1178                         pr_err("page at %lx isn't 16MB (o=%d)\n",
1179                                hva, compound_order(page));
1180                         goto err;
1181                 }
1182                 pginfo[i].pfn = page_to_pfn(page);
1183         }
1184
1185         return 0;
1186
1187  err:
1188         return -EINVAL;
1189 }
1190
1191 void kvmppc_core_commit_memory_region(struct kvm *kvm,
1192                                 struct kvm_userspace_memory_region *mem)
1193 {
1194         if (mem->guest_phys_addr == 0 && mem->memory_size != 0 &&
1195             !kvm->arch.rma)
1196                 kvmppc_map_vrma(kvm, mem);
1197 }
1198
1199 int kvmppc_core_init_vm(struct kvm *kvm)
1200 {
1201         long r;
1202         unsigned long npages = 1ul << (MAX_MEM_ORDER - LARGE_PAGE_ORDER);
1203         long err = -ENOMEM;
1204         unsigned long lpcr;
1205
1206         /* Allocate hashed page table */
1207         r = kvmppc_alloc_hpt(kvm);
1208         if (r)
1209                 return r;
1210
1211         INIT_LIST_HEAD(&kvm->arch.spapr_tce_tables);
1212
1213         kvm->arch.ram_pginfo = kzalloc(npages * sizeof(struct kvmppc_pginfo),
1214                                        GFP_KERNEL);
1215         if (!kvm->arch.ram_pginfo) {
1216                 pr_err("kvmppc_core_init_vm: couldn't alloc %lu bytes\n",
1217                        npages * sizeof(struct kvmppc_pginfo));
1218                 goto out_free;
1219         }
1220
1221         kvm->arch.ram_npages = 0;
1222         kvm->arch.ram_psize = 1ul << LARGE_PAGE_ORDER;
1223         kvm->arch.ram_porder = LARGE_PAGE_ORDER;
1224         kvm->arch.rma = NULL;
1225         kvm->arch.n_rma_pages = 0;
1226
1227         kvm->arch.host_sdr1 = mfspr(SPRN_SDR1);
1228
1229         if (cpu_has_feature(CPU_FTR_ARCH_201)) {
1230                 /* PPC970; HID4 is effectively the LPCR */
1231                 unsigned long lpid = kvm->arch.lpid;
1232                 kvm->arch.host_lpid = 0;
1233                 kvm->arch.host_lpcr = lpcr = mfspr(SPRN_HID4);
1234                 lpcr &= ~((3 << HID4_LPID1_SH) | (0xful << HID4_LPID5_SH));
1235                 lpcr |= ((lpid >> 4) << HID4_LPID1_SH) |
1236                         ((lpid & 0xf) << HID4_LPID5_SH);
1237         } else {
1238                 /* POWER7; init LPCR for virtual RMA mode */
1239                 kvm->arch.host_lpid = mfspr(SPRN_LPID);
1240                 kvm->arch.host_lpcr = lpcr = mfspr(SPRN_LPCR);
1241                 lpcr &= LPCR_PECE | LPCR_LPES;
1242                 lpcr |= (4UL << LPCR_DPFD_SH) | LPCR_HDICE |
1243                         LPCR_VPM0 | LPCR_VRMA_L;
1244         }
1245         kvm->arch.lpcr = lpcr;
1246
1247         return 0;
1248
1249  out_free:
1250         kvmppc_free_hpt(kvm);
1251         return err;
1252 }
1253
1254 void kvmppc_core_destroy_vm(struct kvm *kvm)
1255 {
1256         struct kvmppc_pginfo *pginfo;
1257         unsigned long i;
1258
1259         if (kvm->arch.ram_pginfo) {
1260                 pginfo = kvm->arch.ram_pginfo;
1261                 kvm->arch.ram_pginfo = NULL;
1262                 for (i = kvm->arch.n_rma_pages; i < kvm->arch.ram_npages; ++i)
1263                         if (pginfo[i].pfn)
1264                                 put_page(pfn_to_page(pginfo[i].pfn));
1265                 kfree(pginfo);
1266         }
1267         if (kvm->arch.rma) {
1268                 kvm_release_rma(kvm->arch.rma);
1269                 kvm->arch.rma = NULL;
1270         }
1271
1272         kvmppc_free_hpt(kvm);
1273         WARN_ON(!list_empty(&kvm->arch.spapr_tce_tables));
1274 }
1275
1276 /* These are stubs for now */
1277 void kvmppc_mmu_pte_pflush(struct kvm_vcpu *vcpu, ulong pa_start, ulong pa_end)
1278 {
1279 }
1280
1281 /* We don't need to emulate any privileged instructions or dcbz */
1282 int kvmppc_core_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu,
1283                            unsigned int inst, int *advance)
1284 {
1285         return EMULATE_FAIL;
1286 }
1287
1288 int kvmppc_core_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, int rs)
1289 {
1290         return EMULATE_FAIL;
1291 }
1292
1293 int kvmppc_core_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, int rt)
1294 {
1295         return EMULATE_FAIL;
1296 }
1297
1298 static int kvmppc_book3s_hv_init(void)
1299 {
1300         int r;
1301
1302         r = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
1303
1304         if (r)
1305                 return r;
1306
1307         r = kvmppc_mmu_hv_init();
1308
1309         return r;
1310 }
1311
1312 static void kvmppc_book3s_hv_exit(void)
1313 {
1314         kvm_exit();
1315 }
1316
1317 module_init(kvmppc_book3s_hv_init);
1318 module_exit(kvmppc_book3s_hv_exit);