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/export.h>
  28 #include <linux/fs.h>
  29 #include <linux/anon_inodes.h>
  30 #include <linux/cpumask.h>
  31 #include <linux/spinlock.h>
  32 #include <linux/page-flags.h>
  33
  34 #include <asm/reg.h>
  35 #include <asm/cputable.h>
  36 #include <asm/cacheflush.h>
  37 #include <asm/tlbflush.h>
  38 #include <asm/uaccess.h>
  39 #include <asm/io.h>
  40 #include <asm/kvm_ppc.h>
  41 #include <asm/kvm_book3s.h>
  42 #include <asm/mmu_context.h>
  43 #include <asm/lppaca.h>
  44 #include <asm/processor.h>
  45 #include <asm/cputhreads.h>
  46 #include <asm/page.h>
  47 #include <linux/gfp.h>
  48 #include <linux/sched.h>
  49 #include <linux/vmalloc.h>
  50 #include <linux/highmem.h>
  51
  52 /*
  53  * For now, limit memory to 64GB and require it to be large pages.
  54  * This value is chosen because it makes the ram_pginfo array be
  55  * 64kB in size, which is about as large as we want to be trying
  56  * to allocate with kmalloc.
  57  */
  58 #define MAX_MEM_ORDER           36
  59
  60 #define LARGE_PAGE_ORDER        24      /* 16MB pages */
  61
  62 /* #define EXIT_DEBUG */
  63 /* #define EXIT_DEBUG_SIMPLE */
  64 /* #define EXIT_DEBUG_INT */
  65
  66 static void kvmppc_end_cede(struct kvm_vcpu *vcpu);
  67
  68 void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
  69 {
  70         local_paca->kvm_hstate.kvm_vcpu = vcpu;
  71         local_paca->kvm_hstate.kvm_vcore = vcpu->arch.vcore;
  72 }
  73
  74 void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
  75 {
  76 }
  77
  78 void kvmppc_set_msr(struct kvm_vcpu *vcpu, u64 msr)
  79 {
  80         vcpu->arch.shregs.msr = msr;
  81         kvmppc_end_cede(vcpu);
  82 }
  83
  84 void kvmppc_set_pvr(struct kvm_vcpu *vcpu, u32 pvr)
  85 {
  86         vcpu->arch.pvr = pvr;
  87 }
  88
  89 void kvmppc_dump_regs(struct kvm_vcpu *vcpu)
  90 {
  91         int r;
  92
  93         pr_err("vcpu %p (%d):\n", vcpu, vcpu->vcpu_id);
  94         pr_err("pc  = %.16lx  msr = %.16llx  trap = %x\n",
  95                vcpu->arch.pc, vcpu->arch.shregs.msr, vcpu->arch.trap);
  96         for (r = 0; r < 16; ++r)
  97                 pr_err("r%2d = %.16lx  r%d = %.16lx\n",
  98                        r, kvmppc_get_gpr(vcpu, r),
  99                        r+16, kvmppc_get_gpr(vcpu, r+16));
 100         pr_err("ctr = %.16lx  lr  = %.16lx\n",
 101                vcpu->arch.ctr, vcpu->arch.lr);
 102         pr_err("srr0 = %.16llx srr1 = %.16llx\n",
 103                vcpu->arch.shregs.srr0, vcpu->arch.shregs.srr1);
 104         pr_err("sprg0 = %.16llx sprg1 = %.16llx\n",
 105                vcpu->arch.shregs.sprg0, vcpu->arch.shregs.sprg1);
 106         pr_err("sprg2 = %.16llx sprg3 = %.16llx\n",
 107                vcpu->arch.shregs.sprg2, vcpu->arch.shregs.sprg3);
 108         pr_err("cr = %.8x  xer = %.16lx  dsisr = %.8x\n",
 109                vcpu->arch.cr, vcpu->arch.xer, vcpu->arch.shregs.dsisr);
 110         pr_err("dar = %.16llx\n", vcpu->arch.shregs.dar);
 111         pr_err("fault dar = %.16lx dsisr = %.8x\n",
 112                vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
 113         pr_err("SLB (%d entries):\n", vcpu->arch.slb_max);
 114         for (r = 0; r < vcpu->arch.slb_max; ++r)
 115                 pr_err("  ESID = %.16llx VSID = %.16llx\n",
 116                        vcpu->arch.slb[r].orige, vcpu->arch.slb[r].origv);
 117         pr_err("lpcr = %.16lx sdr1 = %.16lx last_inst = %.8x\n",
 118                vcpu->kvm->arch.lpcr, vcpu->kvm->arch.sdr1,
 119                vcpu->arch.last_inst);
 120 }
 121
 122 struct kvm_vcpu *kvmppc_find_vcpu(struct kvm *kvm, int id)
 123 {
 124         int r;
 125         struct kvm_vcpu *v, *ret = NULL;
 126
 127         mutex_lock(&kvm->lock);
 128         kvm_for_each_vcpu(r, v, kvm) {
 129                 if (v->vcpu_id == id) {
 130                         ret = v;
 131                         break;
 132                 }
 133         }
 134         mutex_unlock(&kvm->lock);
 135         return ret;
 136 }
 137
 138 static void init_vpa(struct kvm_vcpu *vcpu, struct lppaca *vpa)
 139 {
 140         vpa->shared_proc = 1;
 141         vpa->yield_count = 1;
 142 }
 143
 144 static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu,
 145                                        unsigned long flags,
 146                                        unsigned long vcpuid, unsigned long vpa)
 147 {
 148         struct kvm *kvm = vcpu->kvm;
 149         unsigned long pg_index, ra, len;
 150         unsigned long pg_offset;
 151         void *va;
 152         struct kvm_vcpu *tvcpu;
 153
 154         tvcpu = kvmppc_find_vcpu(kvm, vcpuid);
 155         if (!tvcpu)
 156                 return H_PARAMETER;
 157
 158         flags >>= 63 - 18;
 159         flags &= 7;
 160         if (flags == 0 || flags == 4)
 161                 return H_PARAMETER;
 162         if (flags < 4) {
 163                 if (vpa & 0x7f)
 164                         return H_PARAMETER;
 165                 /* registering new area; convert logical addr to real */
 166                 pg_index = vpa >> kvm->arch.ram_porder;
 167                 pg_offset = vpa & (kvm->arch.ram_psize - 1);
 168                 if (pg_index >= kvm->arch.ram_npages)
 169                         return H_PARAMETER;
 170                 if (kvm->arch.ram_pginfo[pg_index].pfn == 0)
 171                         return H_PARAMETER;
 172                 ra = kvm->arch.ram_pginfo[pg_index].pfn << PAGE_SHIFT;
 173                 ra |= pg_offset;
 174                 va = __va(ra);
 175                 if (flags <= 1)
 176                         len = *(unsigned short *)(va + 4);
 177                 else
 178                         len = *(unsigned int *)(va + 4);
 179                 if (pg_offset + len > kvm->arch.ram_psize)
 180                         return H_PARAMETER;
 181                 switch (flags) {
 182                 case 1:         /* register VPA */
 183                         if (len < 640)
 184                                 return H_PARAMETER;
 185                         tvcpu->arch.vpa = va;
 186                         init_vpa(vcpu, va);
 187                         break;
 188                 case 2:         /* register DTL */
 189                         if (len < 48)
 190                                 return H_PARAMETER;
 191                         if (!tvcpu->arch.vpa)
 192                                 return H_RESOURCE;
 193                         len -= len % 48;
 194                         tvcpu->arch.dtl = va;
 195                         tvcpu->arch.dtl_end = va + len;
 196                         break;
 197                 case 3:         /* register SLB shadow buffer */
 198                         if (len < 8)
 199                                 return H_PARAMETER;
 200                         if (!tvcpu->arch.vpa)
 201                                 return H_RESOURCE;
 202                         tvcpu->arch.slb_shadow = va;
 203                         len = (len - 16) / 16;
 204                         tvcpu->arch.slb_shadow = va;
 205                         break;
 206                 }
 207         } else {
 208                 switch (flags) {
 209                 case 5:         /* unregister VPA */
 210                         if (tvcpu->arch.slb_shadow || tvcpu->arch.dtl)
 211                                 return H_RESOURCE;
 212                         tvcpu->arch.vpa = NULL;
 213                         break;
 214                 case 6:         /* unregister DTL */
 215                         tvcpu->arch.dtl = NULL;
 216                         break;
 217                 case 7:         /* unregister SLB shadow buffer */
 218                         tvcpu->arch.slb_shadow = NULL;
 219                         break;
 220                 }
 221         }
 222         return H_SUCCESS;
 223 }
 224
 225 int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu)
 226 {
 227         unsigned long req = kvmppc_get_gpr(vcpu, 3);
 228         unsigned long target, ret = H_SUCCESS;
 229         struct kvm_vcpu *tvcpu;
 230
 231         switch (req) {
 232         case H_CEDE:
 233                 break;
 234         case H_PROD:
 235                 target = kvmppc_get_gpr(vcpu, 4);
 236                 tvcpu = kvmppc_find_vcpu(vcpu->kvm, target);
 237                 if (!tvcpu) {
 238                         ret = H_PARAMETER;
 239                         break;
 240                 }
 241                 tvcpu->arch.prodded = 1;
 242                 smp_mb();
 243                 if (vcpu->arch.ceded) {
 244                         if (waitqueue_active(&vcpu->wq)) {
 245                                 wake_up_interruptible(&vcpu->wq);
 246                                 vcpu->stat.halt_wakeup++;
 247                         }
 248                 }
 249                 break;
 250         case H_CONFER:
 251                 break;
 252         case H_REGISTER_VPA:
 253                 ret = do_h_register_vpa(vcpu, kvmppc_get_gpr(vcpu, 4),
 254                                         kvmppc_get_gpr(vcpu, 5),
 255                                         kvmppc_get_gpr(vcpu, 6));
 256                 break;
 257         default:
 258                 return RESUME_HOST;
 259         }
 260         kvmppc_set_gpr(vcpu, 3, ret);
 261         vcpu->arch.hcall_needed = 0;
 262         return RESUME_GUEST;
 263 }
 264
 265 static int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
 266                               struct task_struct *tsk)
 267 {
 268         int r = RESUME_HOST;
 269
 270         vcpu->stat.sum_exits++;
 271
 272         run->exit_reason = KVM_EXIT_UNKNOWN;
 273         run->ready_for_interrupt_injection = 1;
 274         switch (vcpu->arch.trap) {
 275         /* We're good on these - the host merely wanted to get our attention */
 276         case BOOK3S_INTERRUPT_HV_DECREMENTER:
 277                 vcpu->stat.dec_exits++;
 278                 r = RESUME_GUEST;
 279                 break;
 280         case BOOK3S_INTERRUPT_EXTERNAL:
 281                 vcpu->stat.ext_intr_exits++;
 282                 r = RESUME_GUEST;
 283                 break;
 284         case BOOK3S_INTERRUPT_PERFMON:
 285                 r = RESUME_GUEST;
 286                 break;
 287         case BOOK3S_INTERRUPT_PROGRAM:
 288         {
 289                 ulong flags;
 290                 /*
 291                  * Normally program interrupts are delivered directly
 292                  * to the guest by the hardware, but we can get here
 293                  * as a result of a hypervisor emulation interrupt
 294                  * (e40) getting turned into a 700 by BML RTAS.
 295                  */
 296                 flags = vcpu->arch.shregs.msr & 0x1f0000ull;
 297                 kvmppc_core_queue_program(vcpu, flags);
 298                 r = RESUME_GUEST;
 299                 break;
 300         }
 301         case BOOK3S_INTERRUPT_SYSCALL:
 302         {
 303                 /* hcall - punt to userspace */
 304                 int i;
 305
 306                 if (vcpu->arch.shregs.msr & MSR_PR) {
 307                         /* sc 1 from userspace - reflect to guest syscall */
 308                         kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_SYSCALL);
 309                         r = RESUME_GUEST;
 310                         break;
 311                 }
 312                 run->papr_hcall.nr = kvmppc_get_gpr(vcpu, 3);
 313                 for (i = 0; i < 9; ++i)
 314                         run->papr_hcall.args[i] = kvmppc_get_gpr(vcpu, 4 + i);
 315                 run->exit_reason = KVM_EXIT_PAPR_HCALL;
 316                 vcpu->arch.hcall_needed = 1;
 317                 r = RESUME_HOST;
 318                 break;
 319         }
 320         /*
 321          * We get these next two if the guest does a bad real-mode access,
 322          * as we have enabled VRMA (virtualized real mode area) mode in the
 323          * LPCR.  We just generate an appropriate DSI/ISI to the guest.
 324          */
 325         case BOOK3S_INTERRUPT_H_DATA_STORAGE:
 326                 vcpu->arch.shregs.dsisr = vcpu->arch.fault_dsisr;
 327                 vcpu->arch.shregs.dar = vcpu->arch.fault_dar;
 328                 kvmppc_inject_interrupt(vcpu, BOOK3S_INTERRUPT_DATA_STORAGE, 0);
 329                 r = RESUME_GUEST;
 330                 break;
 331         case BOOK3S_INTERRUPT_H_INST_STORAGE:
 332                 kvmppc_inject_interrupt(vcpu, BOOK3S_INTERRUPT_INST_STORAGE,
 333                                         0x08000000);
 334                 r = RESUME_GUEST;
 335                 break;
 336         /*
 337          * This occurs if the guest executes an illegal instruction.
 338          * We just generate a program interrupt to the guest, since
 339          * we don't emulate any guest instructions at this stage.
 340          */
 341         case BOOK3S_INTERRUPT_H_EMUL_ASSIST:
 342                 kvmppc_core_queue_program(vcpu, 0x80000);
 343                 r = RESUME_GUEST;
 344                 break;
 345         default:
 346                 kvmppc_dump_regs(vcpu);
 347                 printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n",
 348                         vcpu->arch.trap, kvmppc_get_pc(vcpu),
 349                         vcpu->arch.shregs.msr);
 350                 r = RESUME_HOST;
 351                 BUG();
 352                 break;
 353         }
 354
 355         return r;
 356 }
 357
 358 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
 359                                   struct kvm_sregs *sregs)
 360 {
 361         int i;
 362
 363         sregs->pvr = vcpu->arch.pvr;
 364
 365         memset(sregs, 0, sizeof(struct kvm_sregs));
 366         for (i = 0; i < vcpu->arch.slb_max; i++) {
 367                 sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige;
 368                 sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv;
 369         }
 370
 371         return 0;
 372 }
 373
 374 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 375                                   struct kvm_sregs *sregs)
 376 {
 377         int i, j;
 378
 379         kvmppc_set_pvr(vcpu, sregs->pvr);
 380
 381         j = 0;
 382         for (i = 0; i < vcpu->arch.slb_nr; i++) {
 383                 if (sregs->u.s.ppc64.slb[i].slbe & SLB_ESID_V) {
 384                         vcpu->arch.slb[j].orige = sregs->u.s.ppc64.slb[i].slbe;
 385                         vcpu->arch.slb[j].origv = sregs->u.s.ppc64.slb[i].slbv;
 386                         ++j;
 387                 }
 388         }
 389         vcpu->arch.slb_max = j;
 390
 391         return 0;
 392 }
 393
 394 int kvmppc_core_check_processor_compat(void)
 395 {
 396         if (cpu_has_feature(CPU_FTR_HVMODE))
 397                 return 0;
 398         return -EIO;
 399 }
 400
 401 struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
 402 {
 403         struct kvm_vcpu *vcpu;
 404         int err = -EINVAL;
 405         int core;
 406         struct kvmppc_vcore *vcore;
 407
 408         core = id / threads_per_core;
 409         if (core >= KVM_MAX_VCORES)
 410                 goto out;
 411
 412         err = -ENOMEM;
 413         vcpu = kzalloc(sizeof(struct kvm_vcpu), GFP_KERNEL);
 414         if (!vcpu)
 415                 goto out;
 416
 417         err = kvm_vcpu_init(vcpu, kvm, id);
 418         if (err)
 419                 goto free_vcpu;
 420
 421         vcpu->arch.shared = &vcpu->arch.shregs;
 422         vcpu->arch.last_cpu = -1;
 423         vcpu->arch.mmcr[0] = MMCR0_FC;
 424         vcpu->arch.ctrl = CTRL_RUNLATCH;
 425         /* default to host PVR, since we can't spoof it */
 426         vcpu->arch.pvr = mfspr(SPRN_PVR);
 427         kvmppc_set_pvr(vcpu, vcpu->arch.pvr);
 428
 429         kvmppc_mmu_book3s_hv_init(vcpu);
 430
 431         /*
 432          * We consider the vcpu stopped until we see the first run ioctl for it.
 433          */
 434         vcpu->arch.state = KVMPPC_VCPU_STOPPED;
 435
 436         init_waitqueue_head(&vcpu->arch.cpu_run);
 437
 438         mutex_lock(&kvm->lock);
 439         vcore = kvm->arch.vcores[core];
 440         if (!vcore) {
 441                 vcore = kzalloc(sizeof(struct kvmppc_vcore), GFP_KERNEL);
 442                 if (vcore) {
 443                         INIT_LIST_HEAD(&vcore->runnable_threads);
 444                         spin_lock_init(&vcore->lock);
 445                         init_waitqueue_head(&vcore->wq);
 446                 }
 447                 kvm->arch.vcores[core] = vcore;
 448         }
 449         mutex_unlock(&kvm->lock);
 450
 451         if (!vcore)
 452                 goto free_vcpu;
 453
 454         spin_lock(&vcore->lock);
 455         ++vcore->num_threads;
 456         spin_unlock(&vcore->lock);
 457         vcpu->arch.vcore = vcore;
 458
 459         vcpu->arch.cpu_type = KVM_CPU_3S_64;
 460         kvmppc_sanity_check(vcpu);
 461
 462         return vcpu;
 463
 464 free_vcpu:
 465         kfree(vcpu);
 466 out:
 467         return ERR_PTR(err);
 468 }
 469
 470 void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
 471 {
 472         kvm_vcpu_uninit(vcpu);
 473         kfree(vcpu);
 474 }
 475
 476 static void kvmppc_set_timer(struct kvm_vcpu *vcpu)
 477 {
 478         unsigned long dec_nsec, now;
 479
 480         now = get_tb();
 481         if (now > vcpu->arch.dec_expires) {
 482                 /* decrementer has already gone negative */
 483                 kvmppc_core_queue_dec(vcpu);
 484                 kvmppc_core_deliver_interrupts(vcpu);
 485                 return;
 486         }
 487         dec_nsec = (vcpu->arch.dec_expires - now) * NSEC_PER_SEC
 488                    / tb_ticks_per_sec;
 489         hrtimer_start(&vcpu->arch.dec_timer, ktime_set(0, dec_nsec),
 490                       HRTIMER_MODE_REL);
 491         vcpu->arch.timer_running = 1;
 492 }
 493
 494 static void kvmppc_end_cede(struct kvm_vcpu *vcpu)
 495 {
 496         vcpu->arch.ceded = 0;
 497         if (vcpu->arch.timer_running) {
 498                 hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
 499                 vcpu->arch.timer_running = 0;
 500         }
 501 }
 502
 503 extern int __kvmppc_vcore_entry(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu);
 504 extern void xics_wake_cpu(int cpu);
 505
 506 static void kvmppc_remove_runnable(struct kvmppc_vcore *vc,
 507                                    struct kvm_vcpu *vcpu)
 508 {
 509         struct kvm_vcpu *v;
 510
 511         if (vcpu->arch.state != KVMPPC_VCPU_RUNNABLE)
 512                 return;
 513         vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
 514         --vc->n_runnable;
 515         ++vc->n_busy;
 516         /* decrement the physical thread id of each following vcpu */
 517         v = vcpu;
 518         list_for_each_entry_continue(v, &vc->runnable_threads, arch.run_list)
 519                 --v->arch.ptid;
 520         list_del(&vcpu->arch.run_list);
 521 }
 522
 523 static void kvmppc_start_thread(struct kvm_vcpu *vcpu)
 524 {
 525         int cpu;
 526         struct paca_struct *tpaca;
 527         struct kvmppc_vcore *vc = vcpu->arch.vcore;
 528
 529         if (vcpu->arch.timer_running) {
 530                 hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
 531                 vcpu->arch.timer_running = 0;
 532         }
 533         cpu = vc->pcpu + vcpu->arch.ptid;
 534         tpaca = &paca[cpu];
 535         tpaca->kvm_hstate.kvm_vcpu = vcpu;
 536         tpaca->kvm_hstate.kvm_vcore = vc;
 537         tpaca->kvm_hstate.napping = 0;
 538         vcpu->cpu = vc->pcpu;
 539         smp_wmb();
 540 #ifdef CONFIG_PPC_ICP_NATIVE
 541         if (vcpu->arch.ptid) {
 542                 tpaca->cpu_start = 0x80;
 543                 wmb();
 544                 xics_wake_cpu(cpu);
 545                 ++vc->n_woken;
 546         }
 547 #endif
 548 }
 549
 550 static void kvmppc_wait_for_nap(struct kvmppc_vcore *vc)
 551 {
 552         int i;
 553
 554         HMT_low();
 555         i = 0;
 556         while (vc->nap_count < vc->n_woken) {
 557                 if (++i >= 1000000) {
 558                         pr_err("kvmppc_wait_for_nap timeout %d %d\n",
 559                                vc->nap_count, vc->n_woken);
 560                         break;
 561                 }
 562                 cpu_relax();
 563         }
 564         HMT_medium();
 565 }
 566
 567 /*
 568  * Check that we are on thread 0 and that any other threads in
 569  * this core are off-line.
 570  */
 571 static int on_primary_thread(void)
 572 {
 573         int cpu = smp_processor_id();
 574         int thr = cpu_thread_in_core(cpu);
 575
 576         if (thr)
 577                 return 0;
 578         while (++thr < threads_per_core)
 579                 if (cpu_online(cpu + thr))
 580                         return 0;
 581         return 1;
 582 }
 583
 584 /*
 585  * Run a set of guest threads on a physical core.
 586  * Called with vc->lock held.
 587  */
 588 static int kvmppc_run_core(struct kvmppc_vcore *vc)
 589 {
 590         struct kvm_vcpu *vcpu, *vcpu0, *vnext;
 591         long ret;
 592         u64 now;
 593         int ptid;
 594
 595         /* don't start if any threads have a signal pending */
 596         list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
 597                 if (signal_pending(vcpu->arch.run_task))
 598                         return 0;
 599
 600         /*
 601          * Make sure we are running on thread 0, and that
 602          * secondary threads are offline.
 603          * XXX we should also block attempts to bring any
 604          * secondary threads online.
 605          */
 606         if (threads_per_core > 1 && !on_primary_thread()) {
 607                 list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
 608                         vcpu->arch.ret = -EBUSY;
 609                 goto out;
 610         }
 611
 612         /*
 613          * Assign physical thread IDs, first to non-ceded vcpus
 614          * and then to ceded ones.
 615          */
 616         ptid = 0;
 617         vcpu0 = NULL;
 618         list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) {
 619                 if (!vcpu->arch.ceded) {
 620                         if (!ptid)
 621                                 vcpu0 = vcpu;
 622                         vcpu->arch.ptid = ptid++;
 623                 }
 624         }
 625         if (!vcpu0)
 626                 return 0;               /* nothing to run */
 627         list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
 628                 if (vcpu->arch.ceded)
 629                         vcpu->arch.ptid = ptid++;
 630
 631         vc->n_woken = 0;
 632         vc->nap_count = 0;
 633         vc->entry_exit_count = 0;
 634         vc->vcore_state = VCORE_RUNNING;
 635         vc->in_guest = 0;
 636         vc->pcpu = smp_processor_id();
 637         vc->napping_threads = 0;
 638         list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
 639                 kvmppc_start_thread(vcpu);
 640
 641         preempt_disable();
 642         spin_unlock(&vc->lock);
 643
 644         kvm_guest_enter();
 645         __kvmppc_vcore_entry(NULL, vcpu0);
 646
 647         spin_lock(&vc->lock);
 648         /* disable sending of IPIs on virtual external irqs */
 649         list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
 650                 vcpu->cpu = -1;
 651         /* wait for secondary threads to finish writing their state to memory */
 652         if (vc->nap_count < vc->n_woken)
 653                 kvmppc_wait_for_nap(vc);
 654         /* prevent other vcpu threads from doing kvmppc_start_thread() now */
 655         vc->vcore_state = VCORE_EXITING;
 656         spin_unlock(&vc->lock);
 657
 658         /* make sure updates to secondary vcpu structs are visible now */
 659         smp_mb();
 660         kvm_guest_exit();
 661
 662         preempt_enable();
 663         kvm_resched(vcpu);
 664
 665         now = get_tb();
 666         list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) {
 667                 /* cancel pending dec exception if dec is positive */
 668                 if (now < vcpu->arch.dec_expires &&
 669                     kvmppc_core_pending_dec(vcpu))
 670                         kvmppc_core_dequeue_dec(vcpu);
 671
 672                 ret = RESUME_GUEST;
 673                 if (vcpu->arch.trap)
 674                         ret = kvmppc_handle_exit(vcpu->arch.kvm_run, vcpu,
 675                                                  vcpu->arch.run_task);
 676
 677                 vcpu->arch.ret = ret;
 678                 vcpu->arch.trap = 0;
 679
 680                 if (vcpu->arch.ceded) {
 681                         if (ret != RESUME_GUEST)
 682                                 kvmppc_end_cede(vcpu);
 683                         else
 684                                 kvmppc_set_timer(vcpu);
 685                 }
 686         }
 687
 688         spin_lock(&vc->lock);
 689  out:
 690         vc->vcore_state = VCORE_INACTIVE;
 691         list_for_each_entry_safe(vcpu, vnext, &vc->runnable_threads,
 692                                  arch.run_list) {
 693                 if (vcpu->arch.ret != RESUME_GUEST) {
 694                         kvmppc_remove_runnable(vc, vcpu);
 695                         wake_up(&vcpu->arch.cpu_run);
 696                 }
 697         }
 698
 699         return 1;
 700 }
 701
 702 /*
 703  * Wait for some other vcpu thread to execute us, and
 704  * wake us up when we need to handle something in the host.
 705  */
 706 static void kvmppc_wait_for_exec(struct kvm_vcpu *vcpu, int wait_state)
 707 {
 708         DEFINE_WAIT(wait);
 709
 710         prepare_to_wait(&vcpu->arch.cpu_run, &wait, wait_state);
 711         if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE)
 712                 schedule();
 713         finish_wait(&vcpu->arch.cpu_run, &wait);
 714 }
 715
 716 /*
 717  * All the vcpus in this vcore are idle, so wait for a decrementer
 718  * or external interrupt to one of the vcpus.  vc->lock is held.
 719  */
 720 static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
 721 {
 722         DEFINE_WAIT(wait);
 723         struct kvm_vcpu *v;
 724         int all_idle = 1;
 725
 726         prepare_to_wait(&vc->wq, &wait, TASK_INTERRUPTIBLE);
 727         vc->vcore_state = VCORE_SLEEPING;
 728         spin_unlock(&vc->lock);
 729         list_for_each_entry(v, &vc->runnable_threads, arch.run_list) {
 730                 if (!v->arch.ceded || v->arch.pending_exceptions) {
 731                         all_idle = 0;
 732                         break;
 733                 }
 734         }
 735         if (all_idle)
 736                 schedule();
 737         finish_wait(&vc->wq, &wait);
 738         spin_lock(&vc->lock);
 739         vc->vcore_state = VCORE_INACTIVE;
 740 }
 741
 742 static int kvmppc_run_vcpu(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
 743 {
 744         int n_ceded;
 745         int prev_state;
 746         struct kvmppc_vcore *vc;
 747         struct kvm_vcpu *v, *vn;
 748
 749         kvm_run->exit_reason = 0;
 750         vcpu->arch.ret = RESUME_GUEST;
 751         vcpu->arch.trap = 0;
 752
 753         /*
 754          * Synchronize with other threads in this virtual core
 755          */
 756         vc = vcpu->arch.vcore;
 757         spin_lock(&vc->lock);
 758         vcpu->arch.ceded = 0;
 759         vcpu->arch.run_task = current;
 760         vcpu->arch.kvm_run = kvm_run;
 761         prev_state = vcpu->arch.state;
 762         vcpu->arch.state = KVMPPC_VCPU_RUNNABLE;
 763         list_add_tail(&vcpu->arch.run_list, &vc->runnable_threads);
 764         ++vc->n_runnable;
 765
 766         /*
 767          * This happens the first time this is called for a vcpu.
 768          * If the vcore is already running, we may be able to start
 769          * this thread straight away and have it join in.
 770          */
 771         if (prev_state == KVMPPC_VCPU_STOPPED) {
 772                 if (vc->vcore_state == VCORE_RUNNING &&
 773                     VCORE_EXIT_COUNT(vc) == 0) {
 774                         vcpu->arch.ptid = vc->n_runnable - 1;
 775                         kvmppc_start_thread(vcpu);
 776                 }
 777
 778         } else if (prev_state == KVMPPC_VCPU_BUSY_IN_HOST)
 779                 --vc->n_busy;
 780
 781         while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE &&
 782                !signal_pending(current)) {
 783                 if (vc->n_busy || vc->vcore_state != VCORE_INACTIVE) {
 784                         spin_unlock(&vc->lock);
 785                         kvmppc_wait_for_exec(vcpu, TASK_INTERRUPTIBLE);
 786                         spin_lock(&vc->lock);
 787                         continue;
 788                 }
 789                 n_ceded = 0;
 790                 list_for_each_entry(v, &vc->runnable_threads, arch.run_list)
 791                         n_ceded += v->arch.ceded;
 792                 if (n_ceded == vc->n_runnable)
 793                         kvmppc_vcore_blocked(vc);
 794                 else
 795                         kvmppc_run_core(vc);
 796
 797                 list_for_each_entry_safe(v, vn, &vc->runnable_threads,
 798                                          arch.run_list) {
 799                         kvmppc_core_deliver_interrupts(v);
 800                         if (signal_pending(v->arch.run_task)) {
 801                                 kvmppc_remove_runnable(vc, v);
 802                                 v->stat.signal_exits++;
 803                                 v->arch.kvm_run->exit_reason = KVM_EXIT_INTR;
 804                                 v->arch.ret = -EINTR;
 805                                 wake_up(&v->arch.cpu_run);
 806                         }
 807                 }
 808         }
 809
 810         if (signal_pending(current)) {
 811                 if (vc->vcore_state == VCORE_RUNNING ||
 812                     vc->vcore_state == VCORE_EXITING) {
 813                         spin_unlock(&vc->lock);
 814                         kvmppc_wait_for_exec(vcpu, TASK_UNINTERRUPTIBLE);
 815                         spin_lock(&vc->lock);
 816                 }
 817                 if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) {
 818                         kvmppc_remove_runnable(vc, vcpu);
 819                         vcpu->stat.signal_exits++;
 820                         kvm_run->exit_reason = KVM_EXIT_INTR;
 821                         vcpu->arch.ret = -EINTR;
 822                 }
 823         }
 824
 825         spin_unlock(&vc->lock);
 826         return vcpu->arch.ret;
 827 }
 828
 829 int kvmppc_vcpu_run(struct kvm_run *run, struct kvm_vcpu *vcpu)
 830 {
 831         int r;
 832
 833         if (!vcpu->arch.sane) {
 834                 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
 835                 return -EINVAL;
 836         }
 837
 838         /* No need to go into the guest when all we'll do is come back out */
 839         if (signal_pending(current)) {
 840                 run->exit_reason = KVM_EXIT_INTR;
 841                 return -EINTR;
 842         }
 843
 844         /* On PPC970, check that we have an RMA region */
 845         if (!vcpu->kvm->arch.rma && cpu_has_feature(CPU_FTR_ARCH_201))
 846                 return -EPERM;
 847
 848         flush_fp_to_thread(current);
 849         flush_altivec_to_thread(current);
 850         flush_vsx_to_thread(current);
 851         vcpu->arch.wqp = &vcpu->arch.vcore->wq;
 852
 853         do {
 854                 r = kvmppc_run_vcpu(run, vcpu);
 855
 856                 if (run->exit_reason == KVM_EXIT_PAPR_HCALL &&
 857                     !(vcpu->arch.shregs.msr & MSR_PR)) {
 858                         r = kvmppc_pseries_do_hcall(vcpu);
 859                         kvmppc_core_deliver_interrupts(vcpu);
 860                 }
 861         } while (r == RESUME_GUEST);
 862         return r;
 863 }
 864
 865 static long kvmppc_stt_npages(unsigned long window_size)
 866 {
 867         return ALIGN((window_size >> SPAPR_TCE_SHIFT)
 868                      * sizeof(u64), PAGE_SIZE) / PAGE_SIZE;
 869 }
 870
 871 static void release_spapr_tce_table(struct kvmppc_spapr_tce_table *stt)
 872 {
 873         struct kvm *kvm = stt->kvm;
 874         int i;
 875
 876         mutex_lock(&kvm->lock);
 877         list_del(&stt->list);
 878         for (i = 0; i < kvmppc_stt_npages(stt->window_size); i++)
 879                 __free_page(stt->pages[i]);
 880         kfree(stt);
 881         mutex_unlock(&kvm->lock);
 882
 883         kvm_put_kvm(kvm);
 884 }
 885
 886 static int kvm_spapr_tce_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 887 {
 888         struct kvmppc_spapr_tce_table *stt = vma->vm_file->private_data;
 889         struct page *page;
 890
 891         if (vmf->pgoff >= kvmppc_stt_npages(stt->window_size))
 892                 return VM_FAULT_SIGBUS;
 893
 894         page = stt->pages[vmf->pgoff];
 895         get_page(page);
 896         vmf->page = page;
 897         return 0;
 898 }
 899
 900 static const struct vm_operations_struct kvm_spapr_tce_vm_ops = {
 901         .fault = kvm_spapr_tce_fault,
 902 };
 903
 904 static int kvm_spapr_tce_mmap(struct file *file, struct vm_area_struct *vma)
 905 {
 906         vma->vm_ops = &kvm_spapr_tce_vm_ops;
 907         return 0;
 908 }
 909
 910 static int kvm_spapr_tce_release(struct inode *inode, struct file *filp)
 911 {
 912         struct kvmppc_spapr_tce_table *stt = filp->private_data;
 913
 914         release_spapr_tce_table(stt);
 915         return 0;
 916 }
 917
 918 static struct file_operations kvm_spapr_tce_fops = {
 919         .mmap           = kvm_spapr_tce_mmap,
 920         .release        = kvm_spapr_tce_release,
 921 };
 922
 923 long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm,
 924                                    struct kvm_create_spapr_tce *args)
 925 {
 926         struct kvmppc_spapr_tce_table *stt = NULL;
 927         long npages;
 928         int ret = -ENOMEM;
 929         int i;
 930
 931         /* Check this LIOBN hasn't been previously allocated */
 932         list_for_each_entry(stt, &kvm->arch.spapr_tce_tables, list) {
 933                 if (stt->liobn == args->liobn)
 934                         return -EBUSY;
 935         }
 936
 937         npages = kvmppc_stt_npages(args->window_size);
 938
 939         stt = kzalloc(sizeof(*stt) + npages* sizeof(struct page *),
 940                       GFP_KERNEL);
 941         if (!stt)
 942                 goto fail;
 943
 944         stt->liobn = args->liobn;
 945         stt->window_size = args->window_size;
 946         stt->kvm = kvm;
 947
 948         for (i = 0; i < npages; i++) {
 949                 stt->pages[i] = alloc_page(GFP_KERNEL | __GFP_ZERO);
 950                 if (!stt->pages[i])
 951                         goto fail;
 952         }
 953
 954         kvm_get_kvm(kvm);
 955
 956         mutex_lock(&kvm->lock);
 957         list_add(&stt->list, &kvm->arch.spapr_tce_tables);
 958
 959         mutex_unlock(&kvm->lock);
 960
 961         return anon_inode_getfd("kvm-spapr-tce", &kvm_spapr_tce_fops,
 962                                 stt, O_RDWR);
 963
 964 fail:
 965         if (stt) {
 966                 for (i = 0; i < npages; i++)
 967                         if (stt->pages[i])
 968                                 __free_page(stt->pages[i]);
 969
 970                 kfree(stt);
 971         }
 972         return ret;
 973 }
 974
 975 /* Work out RMLS (real mode limit selector) field value for a given RMA size.
 976    Assumes POWER7 or PPC970. */
 977 static inline int lpcr_rmls(unsigned long rma_size)
 978 {
 979         switch (rma_size) {
 980         case 32ul << 20:        /* 32 MB */
 981                 if (cpu_has_feature(CPU_FTR_ARCH_206))
 982                         return 8;       /* only supported on POWER7 */
 983                 return -1;
 984         case 64ul << 20:        /* 64 MB */
 985                 return 3;
 986         case 128ul << 20:       /* 128 MB */
 987                 return 7;
 988         case 256ul << 20:       /* 256 MB */
 989                 return 4;
 990         case 1ul << 30:         /* 1 GB */
 991                 return 2;
 992         case 16ul << 30:        /* 16 GB */
 993                 return 1;
 994         case 256ul << 30:       /* 256 GB */
 995                 return 0;
 996         default:
 997                 return -1;
 998         }
 999 }
1000
1001 static int kvm_rma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1002 {
1003         struct kvmppc_rma_info *ri = vma->vm_file->private_data;
1004         struct page *page;
1005
1006         if (vmf->pgoff >= ri->npages)
1007                 return VM_FAULT_SIGBUS;
1008
1009         page = pfn_to_page(ri->base_pfn + vmf->pgoff);
1010         get_page(page);
1011         vmf->page = page;
1012         return 0;
1013 }
1014
1015 static const struct vm_operations_struct kvm_rma_vm_ops = {
1016         .fault = kvm_rma_fault,
1017 };
1018
1019 static int kvm_rma_mmap(struct file *file, struct vm_area_struct *vma)
1020 {
1021         vma->vm_flags |= VM_RESERVED;
1022         vma->vm_ops = &kvm_rma_vm_ops;
1023         return 0;
1024 }
1025
1026 static int kvm_rma_release(struct inode *inode, struct file *filp)
1027 {
1028         struct kvmppc_rma_info *ri = filp->private_data;
1029
1030         kvm_release_rma(ri);
1031         return 0;
1032 }
1033
1034 static struct file_operations kvm_rma_fops = {
1035         .mmap           = kvm_rma_mmap,
1036         .release        = kvm_rma_release,
1037 };
1038
1039 long kvm_vm_ioctl_allocate_rma(struct kvm *kvm, struct kvm_allocate_rma *ret)
1040 {
1041         struct kvmppc_rma_info *ri;
1042         long fd;
1043
1044         ri = kvm_alloc_rma();
1045         if (!ri)
1046                 return -ENOMEM;
1047
1048         fd = anon_inode_getfd("kvm-rma", &kvm_rma_fops, ri, O_RDWR);
1049         if (fd < 0)
1050                 kvm_release_rma(ri);
1051
1052         ret->rma_size = ri->npages << PAGE_SHIFT;
1053         return fd;
1054 }
1055
1056 static struct page *hva_to_page(unsigned long addr)
1057 {
1058         struct page *page[1];
1059         int npages;
1060
1061         might_sleep();
1062
1063         npages = get_user_pages_fast(addr, 1, 1, page);
1064
1065         if (unlikely(npages != 1))
1066                 return 0;
1067
1068         return page[0];
1069 }
1070
1071 int kvmppc_core_prepare_memory_region(struct kvm *kvm,
1072                                 struct kvm_userspace_memory_region *mem)
1073 {
1074         unsigned long psize, porder;
1075         unsigned long i, npages, totalpages;
1076         unsigned long pg_ix;
1077         struct kvmppc_pginfo *pginfo;
1078         unsigned long hva;
1079         struct kvmppc_rma_info *ri = NULL;
1080         struct page *page;
1081
1082         /* For now, only allow 16MB pages */
1083         porder = LARGE_PAGE_ORDER;
1084         psize = 1ul << porder;
1085         if ((mem->memory_size & (psize - 1)) ||
1086             (mem->guest_phys_addr & (psize - 1))) {
1087                 pr_err("bad memory_size=%llx @ %llx\n",
1088                        mem->memory_size, mem->guest_phys_addr);
1089                 return -EINVAL;
1090         }
1091
1092         npages = mem->memory_size >> porder;
1093         totalpages = (mem->guest_phys_addr + mem->memory_size) >> porder;
1094
1095         /* More memory than we have space to track? */
1096         if (totalpages > (1ul << (MAX_MEM_ORDER - LARGE_PAGE_ORDER)))
1097                 return -EINVAL;
1098
1099         /* Do we already have an RMA registered? */
1100         if (mem->guest_phys_addr == 0 && kvm->arch.rma)
1101                 return -EINVAL;
1102
1103         if (totalpages > kvm->arch.ram_npages)
1104                 kvm->arch.ram_npages = totalpages;
1105
1106         /* Is this one of our preallocated RMAs? */
1107         if (mem->guest_phys_addr == 0) {
1108                 struct vm_area_struct *vma;
1109
1110                 down_read(&current->mm->mmap_sem);
1111                 vma = find_vma(current->mm, mem->userspace_addr);
1112                 if (vma && vma->vm_file &&
1113                     vma->vm_file->f_op == &kvm_rma_fops &&
1114                     mem->userspace_addr == vma->vm_start)
1115                         ri = vma->vm_file->private_data;
1116                 up_read(&current->mm->mmap_sem);
1117                 if (!ri && cpu_has_feature(CPU_FTR_ARCH_201)) {
1118                         pr_err("CPU requires an RMO\n");
1119                         return -EINVAL;
1120                 }
1121         }
1122
1123         if (ri) {
1124                 unsigned long rma_size;
1125                 unsigned long lpcr;
1126                 long rmls;
1127
1128                 rma_size = ri->npages << PAGE_SHIFT;
1129                 if (rma_size > mem->memory_size)
1130                         rma_size = mem->memory_size;
1131                 rmls = lpcr_rmls(rma_size);
1132                 if (rmls < 0) {
1133                         pr_err("Can't use RMA of 0x%lx bytes\n", rma_size);
1134                         return -EINVAL;
1135                 }
1136                 atomic_inc(&ri->use_count);
1137                 kvm->arch.rma = ri;
1138                 kvm->arch.n_rma_pages = rma_size >> porder;
1139
1140                 /* Update LPCR and RMOR */
1141                 lpcr = kvm->arch.lpcr;
1142                 if (cpu_has_feature(CPU_FTR_ARCH_201)) {
1143                         /* PPC970; insert RMLS value (split field) in HID4 */
1144                         lpcr &= ~((1ul << HID4_RMLS0_SH) |
1145                                   (3ul << HID4_RMLS2_SH));
1146                         lpcr |= ((rmls >> 2) << HID4_RMLS0_SH) |
1147                                 ((rmls & 3) << HID4_RMLS2_SH);
1148                         /* RMOR is also in HID4 */
1149                         lpcr |= ((ri->base_pfn >> (26 - PAGE_SHIFT)) & 0xffff)
1150                                 << HID4_RMOR_SH;
1151                 } else {
1152                         /* POWER7 */
1153                         lpcr &= ~(LPCR_VPM0 | LPCR_VRMA_L);
1154                         lpcr |= rmls << LPCR_RMLS_SH;
1155                         kvm->arch.rmor = kvm->arch.rma->base_pfn << PAGE_SHIFT;
1156                 }
1157                 kvm->arch.lpcr = lpcr;
1158                 pr_info("Using RMO at %lx size %lx (LPCR = %lx)\n",
1159                         ri->base_pfn << PAGE_SHIFT, rma_size, lpcr);
1160         }
1161
1162         pg_ix = mem->guest_phys_addr >> porder;
1163         pginfo = kvm->arch.ram_pginfo + pg_ix;
1164         for (i = 0; i < npages; ++i, ++pg_ix) {
1165                 if (ri && pg_ix < kvm->arch.n_rma_pages) {
1166                         pginfo[i].pfn = ri->base_pfn +
1167                                 (pg_ix << (porder - PAGE_SHIFT));
1168                         continue;
1169                 }
1170                 hva = mem->userspace_addr + (i << porder);
1171                 page = hva_to_page(hva);
1172                 if (!page) {
1173                         pr_err("oops, no pfn for hva %lx\n", hva);
1174                         goto err;
1175                 }
1176                 /* Check it's a 16MB page */
1177                 if (!PageHead(page) ||
1178                     compound_order(page) != (LARGE_PAGE_ORDER - PAGE_SHIFT)) {
1179                         pr_err("page at %lx isn't 16MB (o=%d)\n",
1180                                hva, compound_order(page));
1181                         goto err;
1182                 }
1183                 pginfo[i].pfn = page_to_pfn(page);
1184         }
1185
1186         return 0;
1187
1188  err:
1189         return -EINVAL;
1190 }
1191
1192 void kvmppc_core_commit_memory_region(struct kvm *kvm,
1193                                 struct kvm_userspace_memory_region *mem)
1194 {
1195         if (mem->guest_phys_addr == 0 && mem->memory_size != 0 &&
1196             !kvm->arch.rma)
1197                 kvmppc_map_vrma(kvm, mem);
1198 }
1199
1200 int kvmppc_core_init_vm(struct kvm *kvm)
1201 {
1202         long r;
1203         unsigned long npages = 1ul << (MAX_MEM_ORDER - LARGE_PAGE_ORDER);
1204         long err = -ENOMEM;
1205         unsigned long lpcr;
1206
1207         /* Allocate hashed page table */
1208         r = kvmppc_alloc_hpt(kvm);
1209         if (r)
1210                 return r;
1211
1212         INIT_LIST_HEAD(&kvm->arch.spapr_tce_tables);
1213
1214         kvm->arch.ram_pginfo = kzalloc(npages * sizeof(struct kvmppc_pginfo),
1215                                        GFP_KERNEL);
1216         if (!kvm->arch.ram_pginfo) {
1217                 pr_err("kvmppc_core_init_vm: couldn't alloc %lu bytes\n",
1218                        npages * sizeof(struct kvmppc_pginfo));
1219                 goto out_free;
1220         }
1221
1222         kvm->arch.ram_npages = 0;
1223         kvm->arch.ram_psize = 1ul << LARGE_PAGE_ORDER;
1224         kvm->arch.ram_porder = LARGE_PAGE_ORDER;
1225         kvm->arch.rma = NULL;
1226         kvm->arch.n_rma_pages = 0;
1227
1228         kvm->arch.host_sdr1 = mfspr(SPRN_SDR1);
1229
1230         if (cpu_has_feature(CPU_FTR_ARCH_201)) {
1231                 /* PPC970; HID4 is effectively the LPCR */
1232                 unsigned long lpid = kvm->arch.lpid;
1233                 kvm->arch.host_lpid = 0;
1234                 kvm->arch.host_lpcr = lpcr = mfspr(SPRN_HID4);
1235                 lpcr &= ~((3 << HID4_LPID1_SH) | (0xful << HID4_LPID5_SH));
1236                 lpcr |= ((lpid >> 4) << HID4_LPID1_SH) |
1237                         ((lpid & 0xf) << HID4_LPID5_SH);
1238         } else {
1239                 /* POWER7; init LPCR for virtual RMA mode */
1240                 kvm->arch.host_lpid = mfspr(SPRN_LPID);
1241                 kvm->arch.host_lpcr = lpcr = mfspr(SPRN_LPCR);
1242                 lpcr &= LPCR_PECE | LPCR_LPES;
1243                 lpcr |= (4UL << LPCR_DPFD_SH) | LPCR_HDICE |
1244                         LPCR_VPM0 | LPCR_VRMA_L;
1245         }
1246         kvm->arch.lpcr = lpcr;
1247
1248         return 0;
1249
1250  out_free:
1251         kvmppc_free_hpt(kvm);
1252         return err;
1253 }
1254
1255 void kvmppc_core_destroy_vm(struct kvm *kvm)
1256 {
1257         struct kvmppc_pginfo *pginfo;
1258         unsigned long i;
1259
1260         if (kvm->arch.ram_pginfo) {
1261                 pginfo = kvm->arch.ram_pginfo;
1262                 kvm->arch.ram_pginfo = NULL;
1263                 for (i = kvm->arch.n_rma_pages; i < kvm->arch.ram_npages; ++i)
1264                         if (pginfo[i].pfn)
1265                                 put_page(pfn_to_page(pginfo[i].pfn));
1266                 kfree(pginfo);
1267         }
1268         if (kvm->arch.rma) {
1269                 kvm_release_rma(kvm->arch.rma);
1270                 kvm->arch.rma = NULL;
1271         }
1272
1273         kvmppc_free_hpt(kvm);
1274         WARN_ON(!list_empty(&kvm->arch.spapr_tce_tables));
1275 }
1276
1277 /* These are stubs for now */
1278 void kvmppc_mmu_pte_pflush(struct kvm_vcpu *vcpu, ulong pa_start, ulong pa_end)
1279 {
1280 }
1281
1282 /* We don't need to emulate any privileged instructions or dcbz */
1283 int kvmppc_core_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu,
1284                            unsigned int inst, int *advance)
1285 {
1286         return EMULATE_FAIL;
1287 }
1288
1289 int kvmppc_core_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, int rs)
1290 {
1291         return EMULATE_FAIL;
1292 }
1293
1294 int kvmppc_core_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, int rt)
1295 {
1296         return EMULATE_FAIL;
1297 }
1298
1299 static int kvmppc_book3s_hv_init(void)
1300 {
1301         int r;
1302
1303         r = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
1304
1305         if (r)
1306                 return r;
1307
1308         r = kvmppc_mmu_hv_init();
1309
1310         return r;
1311 }
1312
1313 static void kvmppc_book3s_hv_exit(void)
1314 {
1315         kvm_exit();
1316 }
1317
1318 module_init(kvmppc_book3s_hv_init);
1319 module_exit(kvmppc_book3s_hv_exit);