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 <asm/hvcall.h>
  48 #include <linux/gfp.h>
  49 #include <linux/sched.h>
  50 #include <linux/vmalloc.h>
  51 #include <linux/highmem.h>
  52
  53 /*
  54  * For now, limit memory to 64GB and require it to be large pages.
  55  * This value is chosen because it makes the ram_pginfo array be
  56  * 64kB in size, which is about as large as we want to be trying
  57  * to allocate with kmalloc.
  58  */
  59 #define MAX_MEM_ORDER           36
  60
  61 #define LARGE_PAGE_ORDER        24      /* 16MB pages */
  62
  63 /* #define EXIT_DEBUG */
  64 /* #define EXIT_DEBUG_SIMPLE */
  65 /* #define EXIT_DEBUG_INT */
  66
  67 static void kvmppc_end_cede(struct kvm_vcpu *vcpu);
  68
  69 void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
  70 {
  71         local_paca->kvm_hstate.kvm_vcpu = vcpu;
  72         local_paca->kvm_hstate.kvm_vcore = vcpu->arch.vcore;
  73 }
  74
  75 void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
  76 {
  77 }
  78
  79 void kvmppc_set_msr(struct kvm_vcpu *vcpu, u64 msr)
  80 {
  81         vcpu->arch.shregs.msr = msr;
  82         kvmppc_end_cede(vcpu);
  83 }
  84
  85 void kvmppc_set_pvr(struct kvm_vcpu *vcpu, u32 pvr)
  86 {
  87         vcpu->arch.pvr = pvr;
  88 }
  89
  90 void kvmppc_dump_regs(struct kvm_vcpu *vcpu)
  91 {
  92         int r;
  93
  94         pr_err("vcpu %p (%d):\n", vcpu, vcpu->vcpu_id);
  95         pr_err("pc  = %.16lx  msr = %.16llx  trap = %x\n",
  96                vcpu->arch.pc, vcpu->arch.shregs.msr, vcpu->arch.trap);
  97         for (r = 0; r < 16; ++r)
  98                 pr_err("r%2d = %.16lx  r%d = %.16lx\n",
  99                        r, kvmppc_get_gpr(vcpu, r),
 100                        r+16, kvmppc_get_gpr(vcpu, r+16));
 101         pr_err("ctr = %.16lx  lr  = %.16lx\n",
 102                vcpu->arch.ctr, vcpu->arch.lr);
 103         pr_err("srr0 = %.16llx srr1 = %.16llx\n",
 104                vcpu->arch.shregs.srr0, vcpu->arch.shregs.srr1);
 105         pr_err("sprg0 = %.16llx sprg1 = %.16llx\n",
 106                vcpu->arch.shregs.sprg0, vcpu->arch.shregs.sprg1);
 107         pr_err("sprg2 = %.16llx sprg3 = %.16llx\n",
 108                vcpu->arch.shregs.sprg2, vcpu->arch.shregs.sprg3);
 109         pr_err("cr = %.8x  xer = %.16lx  dsisr = %.8x\n",
 110                vcpu->arch.cr, vcpu->arch.xer, vcpu->arch.shregs.dsisr);
 111         pr_err("dar = %.16llx\n", vcpu->arch.shregs.dar);
 112         pr_err("fault dar = %.16lx dsisr = %.8x\n",
 113                vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
 114         pr_err("SLB (%d entries):\n", vcpu->arch.slb_max);
 115         for (r = 0; r < vcpu->arch.slb_max; ++r)
 116                 pr_err("  ESID = %.16llx VSID = %.16llx\n",
 117                        vcpu->arch.slb[r].orige, vcpu->arch.slb[r].origv);
 118         pr_err("lpcr = %.16lx sdr1 = %.16lx last_inst = %.8x\n",
 119                vcpu->kvm->arch.lpcr, vcpu->kvm->arch.sdr1,
 120                vcpu->arch.last_inst);
 121 }
 122
 123 struct kvm_vcpu *kvmppc_find_vcpu(struct kvm *kvm, int id)
 124 {
 125         int r;
 126         struct kvm_vcpu *v, *ret = NULL;
 127
 128         mutex_lock(&kvm->lock);
 129         kvm_for_each_vcpu(r, v, kvm) {
 130                 if (v->vcpu_id == id) {
 131                         ret = v;
 132                         break;
 133                 }
 134         }
 135         mutex_unlock(&kvm->lock);
 136         return ret;
 137 }
 138
 139 static void init_vpa(struct kvm_vcpu *vcpu, struct lppaca *vpa)
 140 {
 141         vpa->shared_proc = 1;
 142         vpa->yield_count = 1;
 143 }
 144
 145 static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu,
 146                                        unsigned long flags,
 147                                        unsigned long vcpuid, unsigned long vpa)
 148 {
 149         struct kvm *kvm = vcpu->kvm;
 150         unsigned long pg_index, ra, len;
 151         unsigned long pg_offset;
 152         void *va;
 153         struct kvm_vcpu *tvcpu;
 154
 155         tvcpu = kvmppc_find_vcpu(kvm, vcpuid);
 156         if (!tvcpu)
 157                 return H_PARAMETER;
 158
 159         flags >>= 63 - 18;
 160         flags &= 7;
 161         if (flags == 0 || flags == 4)
 162                 return H_PARAMETER;
 163         if (flags < 4) {
 164                 if (vpa & 0x7f)
 165                         return H_PARAMETER;
 166                 /* registering new area; convert logical addr to real */
 167                 pg_index = vpa >> kvm->arch.ram_porder;
 168                 pg_offset = vpa & (kvm->arch.ram_psize - 1);
 169                 if (pg_index >= kvm->arch.ram_npages)
 170                         return H_PARAMETER;
 171                 if (kvm->arch.ram_pginfo[pg_index].pfn == 0)
 172                         return H_PARAMETER;
 173                 ra = kvm->arch.ram_pginfo[pg_index].pfn << PAGE_SHIFT;
 174                 ra |= pg_offset;
 175                 va = __va(ra);
 176                 if (flags <= 1)
 177                         len = *(unsigned short *)(va + 4);
 178                 else
 179                         len = *(unsigned int *)(va + 4);
 180                 if (pg_offset + len > kvm->arch.ram_psize)
 181                         return H_PARAMETER;
 182                 switch (flags) {
 183                 case 1:         /* register VPA */
 184                         if (len < 640)
 185                                 return H_PARAMETER;
 186                         tvcpu->arch.vpa = va;
 187                         init_vpa(vcpu, va);
 188                         break;
 189                 case 2:         /* register DTL */
 190                         if (len < 48)
 191                                 return H_PARAMETER;
 192                         if (!tvcpu->arch.vpa)
 193                                 return H_RESOURCE;
 194                         len -= len % 48;
 195                         tvcpu->arch.dtl = va;
 196                         tvcpu->arch.dtl_end = va + len;
 197                         break;
 198                 case 3:         /* register SLB shadow buffer */
 199                         if (len < 8)
 200                                 return H_PARAMETER;
 201                         if (!tvcpu->arch.vpa)
 202                                 return H_RESOURCE;
 203                         tvcpu->arch.slb_shadow = va;
 204                         len = (len - 16) / 16;
 205                         tvcpu->arch.slb_shadow = va;
 206                         break;
 207                 }
 208         } else {
 209                 switch (flags) {
 210                 case 5:         /* unregister VPA */
 211                         if (tvcpu->arch.slb_shadow || tvcpu->arch.dtl)
 212                                 return H_RESOURCE;
 213                         tvcpu->arch.vpa = NULL;
 214                         break;
 215                 case 6:         /* unregister DTL */
 216                         tvcpu->arch.dtl = NULL;
 217                         break;
 218                 case 7:         /* unregister SLB shadow buffer */
 219                         tvcpu->arch.slb_shadow = NULL;
 220                         break;
 221                 }
 222         }
 223         return H_SUCCESS;
 224 }
 225
 226 int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu)
 227 {
 228         unsigned long req = kvmppc_get_gpr(vcpu, 3);
 229         unsigned long target, ret = H_SUCCESS;
 230         struct kvm_vcpu *tvcpu;
 231
 232         switch (req) {
 233         case H_CEDE:
 234                 break;
 235         case H_PROD:
 236                 target = kvmppc_get_gpr(vcpu, 4);
 237                 tvcpu = kvmppc_find_vcpu(vcpu->kvm, target);
 238                 if (!tvcpu) {
 239                         ret = H_PARAMETER;
 240                         break;
 241                 }
 242                 tvcpu->arch.prodded = 1;
 243                 smp_mb();
 244                 if (vcpu->arch.ceded) {
 245                         if (waitqueue_active(&vcpu->wq)) {
 246                                 wake_up_interruptible(&vcpu->wq);
 247                                 vcpu->stat.halt_wakeup++;
 248                         }
 249                 }
 250                 break;
 251         case H_CONFER:
 252                 break;
 253         case H_REGISTER_VPA:
 254                 ret = do_h_register_vpa(vcpu, kvmppc_get_gpr(vcpu, 4),
 255                                         kvmppc_get_gpr(vcpu, 5),
 256                                         kvmppc_get_gpr(vcpu, 6));
 257                 break;
 258         default:
 259                 return RESUME_HOST;
 260         }
 261         kvmppc_set_gpr(vcpu, 3, ret);
 262         vcpu->arch.hcall_needed = 0;
 263         return RESUME_GUEST;
 264 }
 265
 266 static int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
 267                               struct task_struct *tsk)
 268 {
 269         int r = RESUME_HOST;
 270
 271         vcpu->stat.sum_exits++;
 272
 273         run->exit_reason = KVM_EXIT_UNKNOWN;
 274         run->ready_for_interrupt_injection = 1;
 275         switch (vcpu->arch.trap) {
 276         /* We're good on these - the host merely wanted to get our attention */
 277         case BOOK3S_INTERRUPT_HV_DECREMENTER:
 278                 vcpu->stat.dec_exits++;
 279                 r = RESUME_GUEST;
 280                 break;
 281         case BOOK3S_INTERRUPT_EXTERNAL:
 282                 vcpu->stat.ext_intr_exits++;
 283                 r = RESUME_GUEST;
 284                 break;
 285         case BOOK3S_INTERRUPT_PERFMON:
 286                 r = RESUME_GUEST;
 287                 break;
 288         case BOOK3S_INTERRUPT_PROGRAM:
 289         {
 290                 ulong flags;
 291                 /*
 292                  * Normally program interrupts are delivered directly
 293                  * to the guest by the hardware, but we can get here
 294                  * as a result of a hypervisor emulation interrupt
 295                  * (e40) getting turned into a 700 by BML RTAS.
 296                  */
 297                 flags = vcpu->arch.shregs.msr & 0x1f0000ull;
 298                 kvmppc_core_queue_program(vcpu, flags);
 299                 r = RESUME_GUEST;
 300                 break;
 301         }
 302         case BOOK3S_INTERRUPT_SYSCALL:
 303         {
 304                 /* hcall - punt to userspace */
 305                 int i;
 306
 307                 if (vcpu->arch.shregs.msr & MSR_PR) {
 308                         /* sc 1 from userspace - reflect to guest syscall */
 309                         kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_SYSCALL);
 310                         r = RESUME_GUEST;
 311                         break;
 312                 }
 313                 run->papr_hcall.nr = kvmppc_get_gpr(vcpu, 3);
 314                 for (i = 0; i < 9; ++i)
 315                         run->papr_hcall.args[i] = kvmppc_get_gpr(vcpu, 4 + i);
 316                 run->exit_reason = KVM_EXIT_PAPR_HCALL;
 317                 vcpu->arch.hcall_needed = 1;
 318                 r = RESUME_HOST;
 319                 break;
 320         }
 321         /*
 322          * We get these next two if the guest does a bad real-mode access,
 323          * as we have enabled VRMA (virtualized real mode area) mode in the
 324          * LPCR.  We just generate an appropriate DSI/ISI to the guest.
 325          */
 326         case BOOK3S_INTERRUPT_H_DATA_STORAGE:
 327                 vcpu->arch.shregs.dsisr = vcpu->arch.fault_dsisr;
 328                 vcpu->arch.shregs.dar = vcpu->arch.fault_dar;
 329                 kvmppc_inject_interrupt(vcpu, BOOK3S_INTERRUPT_DATA_STORAGE, 0);
 330                 r = RESUME_GUEST;
 331                 break;
 332         case BOOK3S_INTERRUPT_H_INST_STORAGE:
 333                 kvmppc_inject_interrupt(vcpu, BOOK3S_INTERRUPT_INST_STORAGE,
 334                                         0x08000000);
 335                 r = RESUME_GUEST;
 336                 break;
 337         /*
 338          * This occurs if the guest executes an illegal instruction.
 339          * We just generate a program interrupt to the guest, since
 340          * we don't emulate any guest instructions at this stage.
 341          */
 342         case BOOK3S_INTERRUPT_H_EMUL_ASSIST:
 343                 kvmppc_core_queue_program(vcpu, 0x80000);
 344                 r = RESUME_GUEST;
 345                 break;
 346         default:
 347                 kvmppc_dump_regs(vcpu);
 348                 printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n",
 349                         vcpu->arch.trap, kvmppc_get_pc(vcpu),
 350                         vcpu->arch.shregs.msr);
 351                 r = RESUME_HOST;
 352                 BUG();
 353                 break;
 354         }
 355
 356         return r;
 357 }
 358
 359 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
 360                                   struct kvm_sregs *sregs)
 361 {
 362         int i;
 363
 364         sregs->pvr = vcpu->arch.pvr;
 365
 366         memset(sregs, 0, sizeof(struct kvm_sregs));
 367         for (i = 0; i < vcpu->arch.slb_max; i++) {
 368                 sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige;
 369                 sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv;
 370         }
 371
 372         return 0;
 373 }
 374
 375 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 376                                   struct kvm_sregs *sregs)
 377 {
 378         int i, j;
 379
 380         kvmppc_set_pvr(vcpu, sregs->pvr);
 381
 382         j = 0;
 383         for (i = 0; i < vcpu->arch.slb_nr; i++) {
 384                 if (sregs->u.s.ppc64.slb[i].slbe & SLB_ESID_V) {
 385                         vcpu->arch.slb[j].orige = sregs->u.s.ppc64.slb[i].slbe;
 386                         vcpu->arch.slb[j].origv = sregs->u.s.ppc64.slb[i].slbv;
 387                         ++j;
 388                 }
 389         }
 390         vcpu->arch.slb_max = j;
 391
 392         return 0;
 393 }
 394
 395 int kvmppc_core_check_processor_compat(void)
 396 {
 397         if (cpu_has_feature(CPU_FTR_HVMODE))
 398                 return 0;
 399         return -EIO;
 400 }
 401
 402 struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
 403 {
 404         struct kvm_vcpu *vcpu;
 405         int err = -EINVAL;
 406         int core;
 407         struct kvmppc_vcore *vcore;
 408
 409         core = id / threads_per_core;
 410         if (core >= KVM_MAX_VCORES)
 411                 goto out;
 412
 413         err = -ENOMEM;
 414         vcpu = kzalloc(sizeof(struct kvm_vcpu), GFP_KERNEL);
 415         if (!vcpu)
 416                 goto out;
 417
 418         err = kvm_vcpu_init(vcpu, kvm, id);
 419         if (err)
 420                 goto free_vcpu;
 421
 422         vcpu->arch.shared = &vcpu->arch.shregs;
 423         vcpu->arch.last_cpu = -1;
 424         vcpu->arch.mmcr[0] = MMCR0_FC;
 425         vcpu->arch.ctrl = CTRL_RUNLATCH;
 426         /* default to host PVR, since we can't spoof it */
 427         vcpu->arch.pvr = mfspr(SPRN_PVR);
 428         kvmppc_set_pvr(vcpu, vcpu->arch.pvr);
 429
 430         kvmppc_mmu_book3s_hv_init(vcpu);
 431
 432         /*
 433          * We consider the vcpu stopped until we see the first run ioctl for it.
 434          */
 435         vcpu->arch.state = KVMPPC_VCPU_STOPPED;
 436
 437         init_waitqueue_head(&vcpu->arch.cpu_run);
 438
 439         mutex_lock(&kvm->lock);
 440         vcore = kvm->arch.vcores[core];
 441         if (!vcore) {
 442                 vcore = kzalloc(sizeof(struct kvmppc_vcore), GFP_KERNEL);
 443                 if (vcore) {
 444                         INIT_LIST_HEAD(&vcore->runnable_threads);
 445                         spin_lock_init(&vcore->lock);
 446                         init_waitqueue_head(&vcore->wq);
 447                 }
 448                 kvm->arch.vcores[core] = vcore;
 449         }
 450         mutex_unlock(&kvm->lock);
 451
 452         if (!vcore)
 453                 goto free_vcpu;
 454
 455         spin_lock(&vcore->lock);
 456         ++vcore->num_threads;
 457         spin_unlock(&vcore->lock);
 458         vcpu->arch.vcore = vcore;
 459
 460         vcpu->arch.cpu_type = KVM_CPU_3S_64;
 461         kvmppc_sanity_check(vcpu);
 462
 463         return vcpu;
 464
 465 free_vcpu:
 466         kfree(vcpu);
 467 out:
 468         return ERR_PTR(err);
 469 }
 470
 471 void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
 472 {
 473         kvm_vcpu_uninit(vcpu);
 474         kfree(vcpu);
 475 }
 476
 477 static void kvmppc_set_timer(struct kvm_vcpu *vcpu)
 478 {
 479         unsigned long dec_nsec, now;
 480
 481         now = get_tb();
 482         if (now > vcpu->arch.dec_expires) {
 483                 /* decrementer has already gone negative */
 484                 kvmppc_core_queue_dec(vcpu);
 485                 kvmppc_core_deliver_interrupts(vcpu);
 486                 return;
 487         }
 488         dec_nsec = (vcpu->arch.dec_expires - now) * NSEC_PER_SEC
 489                    / tb_ticks_per_sec;
 490         hrtimer_start(&vcpu->arch.dec_timer, ktime_set(0, dec_nsec),
 491                       HRTIMER_MODE_REL);
 492         vcpu->arch.timer_running = 1;
 493 }
 494
 495 static void kvmppc_end_cede(struct kvm_vcpu *vcpu)
 496 {
 497         vcpu->arch.ceded = 0;
 498         if (vcpu->arch.timer_running) {
 499                 hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
 500                 vcpu->arch.timer_running = 0;
 501         }
 502 }
 503
 504 extern int __kvmppc_vcore_entry(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu);
 505 extern void xics_wake_cpu(int cpu);
 506
 507 static void kvmppc_remove_runnable(struct kvmppc_vcore *vc,
 508                                    struct kvm_vcpu *vcpu)
 509 {
 510         struct kvm_vcpu *v;
 511
 512         if (vcpu->arch.state != KVMPPC_VCPU_RUNNABLE)
 513                 return;
 514         vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
 515         --vc->n_runnable;
 516         ++vc->n_busy;
 517         /* decrement the physical thread id of each following vcpu */
 518         v = vcpu;
 519         list_for_each_entry_continue(v, &vc->runnable_threads, arch.run_list)
 520                 --v->arch.ptid;
 521         list_del(&vcpu->arch.run_list);
 522 }
 523
 524 static void kvmppc_start_thread(struct kvm_vcpu *vcpu)
 525 {
 526         int cpu;
 527         struct paca_struct *tpaca;
 528         struct kvmppc_vcore *vc = vcpu->arch.vcore;
 529
 530         if (vcpu->arch.timer_running) {
 531                 hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
 532                 vcpu->arch.timer_running = 0;
 533         }
 534         cpu = vc->pcpu + vcpu->arch.ptid;
 535         tpaca = &paca[cpu];
 536         tpaca->kvm_hstate.kvm_vcpu = vcpu;
 537         tpaca->kvm_hstate.kvm_vcore = vc;
 538         tpaca->kvm_hstate.napping = 0;
 539         vcpu->cpu = vc->pcpu;
 540         smp_wmb();
 541 #ifdef CONFIG_PPC_ICP_NATIVE
 542         if (vcpu->arch.ptid) {
 543                 tpaca->cpu_start = 0x80;
 544                 wmb();
 545                 xics_wake_cpu(cpu);
 546                 ++vc->n_woken;
 547         }
 548 #endif
 549 }
 550
 551 static void kvmppc_wait_for_nap(struct kvmppc_vcore *vc)
 552 {
 553         int i;
 554
 555         HMT_low();
 556         i = 0;
 557         while (vc->nap_count < vc->n_woken) {
 558                 if (++i >= 1000000) {
 559                         pr_err("kvmppc_wait_for_nap timeout %d %d\n",
 560                                vc->nap_count, vc->n_woken);
 561                         break;
 562                 }
 563                 cpu_relax();
 564         }
 565         HMT_medium();
 566 }
 567
 568 /*
 569  * Check that we are on thread 0 and that any other threads in
 570  * this core are off-line.
 571  */
 572 static int on_primary_thread(void)
 573 {
 574         int cpu = smp_processor_id();
 575         int thr = cpu_thread_in_core(cpu);
 576
 577         if (thr)
 578                 return 0;
 579         while (++thr < threads_per_core)
 580                 if (cpu_online(cpu + thr))
 581                         return 0;
 582         return 1;
 583 }
 584
 585 /*
 586  * Run a set of guest threads on a physical core.
 587  * Called with vc->lock held.
 588  */
 589 static int kvmppc_run_core(struct kvmppc_vcore *vc)
 590 {
 591         struct kvm_vcpu *vcpu, *vcpu0, *vnext;
 592         long ret;
 593         u64 now;
 594         int ptid;
 595
 596         /* don't start if any threads have a signal pending */
 597         list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
 598                 if (signal_pending(vcpu->arch.run_task))
 599                         return 0;
 600
 601         /*
 602          * Make sure we are running on thread 0, and that
 603          * secondary threads are offline.
 604          * XXX we should also block attempts to bring any
 605          * secondary threads online.
 606          */
 607         if (threads_per_core > 1 && !on_primary_thread()) {
 608                 list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
 609                         vcpu->arch.ret = -EBUSY;
 610                 goto out;
 611         }
 612
 613         /*
 614          * Assign physical thread IDs, first to non-ceded vcpus
 615          * and then to ceded ones.
 616          */
 617         ptid = 0;
 618         vcpu0 = NULL;
 619         list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) {
 620                 if (!vcpu->arch.ceded) {
 621                         if (!ptid)
 622                                 vcpu0 = vcpu;
 623                         vcpu->arch.ptid = ptid++;
 624                 }
 625         }
 626         if (!vcpu0)
 627                 return 0;               /* nothing to run */
 628         list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
 629                 if (vcpu->arch.ceded)
 630                         vcpu->arch.ptid = ptid++;
 631
 632         vc->n_woken = 0;
 633         vc->nap_count = 0;
 634         vc->entry_exit_count = 0;
 635         vc->vcore_state = VCORE_RUNNING;
 636         vc->in_guest = 0;
 637         vc->pcpu = smp_processor_id();
 638         vc->napping_threads = 0;
 639         list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
 640                 kvmppc_start_thread(vcpu);
 641
 642         preempt_disable();
 643         spin_unlock(&vc->lock);
 644
 645         kvm_guest_enter();
 646         __kvmppc_vcore_entry(NULL, vcpu0);
 647
 648         spin_lock(&vc->lock);
 649         /* disable sending of IPIs on virtual external irqs */
 650         list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
 651                 vcpu->cpu = -1;
 652         /* wait for secondary threads to finish writing their state to memory */
 653         if (vc->nap_count < vc->n_woken)
 654                 kvmppc_wait_for_nap(vc);
 655         /* prevent other vcpu threads from doing kvmppc_start_thread() now */
 656         vc->vcore_state = VCORE_EXITING;
 657         spin_unlock(&vc->lock);
 658
 659         /* make sure updates to secondary vcpu structs are visible now */
 660         smp_mb();
 661         kvm_guest_exit();
 662
 663         preempt_enable();
 664         kvm_resched(vcpu);
 665
 666         now = get_tb();
 667         list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) {
 668                 /* cancel pending dec exception if dec is positive */
 669                 if (now < vcpu->arch.dec_expires &&
 670                     kvmppc_core_pending_dec(vcpu))
 671                         kvmppc_core_dequeue_dec(vcpu);
 672
 673                 ret = RESUME_GUEST;
 674                 if (vcpu->arch.trap)
 675                         ret = kvmppc_handle_exit(vcpu->arch.kvm_run, vcpu,
 676                                                  vcpu->arch.run_task);
 677
 678                 vcpu->arch.ret = ret;
 679                 vcpu->arch.trap = 0;
 680
 681                 if (vcpu->arch.ceded) {
 682                         if (ret != RESUME_GUEST)
 683                                 kvmppc_end_cede(vcpu);
 684                         else
 685                                 kvmppc_set_timer(vcpu);
 686                 }
 687         }
 688
 689         spin_lock(&vc->lock);
 690  out:
 691         vc->vcore_state = VCORE_INACTIVE;
 692         list_for_each_entry_safe(vcpu, vnext, &vc->runnable_threads,
 693                                  arch.run_list) {
 694                 if (vcpu->arch.ret != RESUME_GUEST) {
 695                         kvmppc_remove_runnable(vc, vcpu);
 696                         wake_up(&vcpu->arch.cpu_run);
 697                 }
 698         }
 699
 700         return 1;
 701 }
 702
 703 /*
 704  * Wait for some other vcpu thread to execute us, and
 705  * wake us up when we need to handle something in the host.
 706  */
 707 static void kvmppc_wait_for_exec(struct kvm_vcpu *vcpu, int wait_state)
 708 {
 709         DEFINE_WAIT(wait);
 710
 711         prepare_to_wait(&vcpu->arch.cpu_run, &wait, wait_state);
 712         if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE)
 713                 schedule();
 714         finish_wait(&vcpu->arch.cpu_run, &wait);
 715 }
 716
 717 /*
 718  * All the vcpus in this vcore are idle, so wait for a decrementer
 719  * or external interrupt to one of the vcpus.  vc->lock is held.
 720  */
 721 static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
 722 {
 723         DEFINE_WAIT(wait);
 724         struct kvm_vcpu *v;
 725         int all_idle = 1;
 726
 727         prepare_to_wait(&vc->wq, &wait, TASK_INTERRUPTIBLE);
 728         vc->vcore_state = VCORE_SLEEPING;
 729         spin_unlock(&vc->lock);
 730         list_for_each_entry(v, &vc->runnable_threads, arch.run_list) {
 731                 if (!v->arch.ceded || v->arch.pending_exceptions) {
 732                         all_idle = 0;
 733                         break;
 734                 }
 735         }
 736         if (all_idle)
 737                 schedule();
 738         finish_wait(&vc->wq, &wait);
 739         spin_lock(&vc->lock);
 740         vc->vcore_state = VCORE_INACTIVE;
 741 }
 742
 743 static int kvmppc_run_vcpu(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
 744 {
 745         int n_ceded;
 746         int prev_state;
 747         struct kvmppc_vcore *vc;
 748         struct kvm_vcpu *v, *vn;
 749
 750         kvm_run->exit_reason = 0;
 751         vcpu->arch.ret = RESUME_GUEST;
 752         vcpu->arch.trap = 0;
 753
 754         /*
 755          * Synchronize with other threads in this virtual core
 756          */
 757         vc = vcpu->arch.vcore;
 758         spin_lock(&vc->lock);
 759         vcpu->arch.ceded = 0;
 760         vcpu->arch.run_task = current;
 761         vcpu->arch.kvm_run = kvm_run;
 762         prev_state = vcpu->arch.state;
 763         vcpu->arch.state = KVMPPC_VCPU_RUNNABLE;
 764         list_add_tail(&vcpu->arch.run_list, &vc->runnable_threads);
 765         ++vc->n_runnable;
 766
 767         /*
 768          * This happens the first time this is called for a vcpu.
 769          * If the vcore is already running, we may be able to start
 770          * this thread straight away and have it join in.
 771          */
 772         if (prev_state == KVMPPC_VCPU_STOPPED) {
 773                 if (vc->vcore_state == VCORE_RUNNING &&
 774                     VCORE_EXIT_COUNT(vc) == 0) {
 775                         vcpu->arch.ptid = vc->n_runnable - 1;
 776                         kvmppc_start_thread(vcpu);
 777                 }
 778
 779         } else if (prev_state == KVMPPC_VCPU_BUSY_IN_HOST)
 780                 --vc->n_busy;
 781
 782         while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE &&
 783                !signal_pending(current)) {
 784                 if (vc->n_busy || vc->vcore_state != VCORE_INACTIVE) {
 785                         spin_unlock(&vc->lock);
 786                         kvmppc_wait_for_exec(vcpu, TASK_INTERRUPTIBLE);
 787                         spin_lock(&vc->lock);
 788                         continue;
 789                 }
 790                 n_ceded = 0;
 791                 list_for_each_entry(v, &vc->runnable_threads, arch.run_list)
 792                         n_ceded += v->arch.ceded;
 793                 if (n_ceded == vc->n_runnable)
 794                         kvmppc_vcore_blocked(vc);
 795                 else
 796                         kvmppc_run_core(vc);
 797
 798                 list_for_each_entry_safe(v, vn, &vc->runnable_threads,
 799                                          arch.run_list) {
 800                         kvmppc_core_deliver_interrupts(v);
 801                         if (signal_pending(v->arch.run_task)) {
 802                                 kvmppc_remove_runnable(vc, v);
 803                                 v->stat.signal_exits++;
 804                                 v->arch.kvm_run->exit_reason = KVM_EXIT_INTR;
 805                                 v->arch.ret = -EINTR;
 806                                 wake_up(&v->arch.cpu_run);
 807                         }
 808                 }
 809         }
 810
 811         if (signal_pending(current)) {
 812                 if (vc->vcore_state == VCORE_RUNNING ||
 813                     vc->vcore_state == VCORE_EXITING) {
 814                         spin_unlock(&vc->lock);
 815                         kvmppc_wait_for_exec(vcpu, TASK_UNINTERRUPTIBLE);
 816                         spin_lock(&vc->lock);
 817                 }
 818                 if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) {
 819                         kvmppc_remove_runnable(vc, vcpu);
 820                         vcpu->stat.signal_exits++;
 821                         kvm_run->exit_reason = KVM_EXIT_INTR;
 822                         vcpu->arch.ret = -EINTR;
 823                 }
 824         }
 825
 826         spin_unlock(&vc->lock);
 827         return vcpu->arch.ret;
 828 }
 829
 830 int kvmppc_vcpu_run(struct kvm_run *run, struct kvm_vcpu *vcpu)
 831 {
 832         int r;
 833
 834         if (!vcpu->arch.sane) {
 835                 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
 836                 return -EINVAL;
 837         }
 838
 839         /* No need to go into the guest when all we'll do is come back out */
 840         if (signal_pending(current)) {
 841                 run->exit_reason = KVM_EXIT_INTR;
 842                 return -EINTR;
 843         }
 844
 845         /* On PPC970, check that we have an RMA region */
 846         if (!vcpu->kvm->arch.rma && cpu_has_feature(CPU_FTR_ARCH_201))
 847                 return -EPERM;
 848
 849         flush_fp_to_thread(current);
 850         flush_altivec_to_thread(current);
 851         flush_vsx_to_thread(current);
 852         vcpu->arch.wqp = &vcpu->arch.vcore->wq;
 853
 854         do {
 855                 r = kvmppc_run_vcpu(run, vcpu);
 856
 857                 if (run->exit_reason == KVM_EXIT_PAPR_HCALL &&
 858                     !(vcpu->arch.shregs.msr & MSR_PR)) {
 859                         r = kvmppc_pseries_do_hcall(vcpu);
 860                         kvmppc_core_deliver_interrupts(vcpu);
 861                 }
 862         } while (r == RESUME_GUEST);
 863         return r;
 864 }
 865
 866 static long kvmppc_stt_npages(unsigned long window_size)
 867 {
 868         return ALIGN((window_size >> SPAPR_TCE_SHIFT)
 869                      * sizeof(u64), PAGE_SIZE) / PAGE_SIZE;
 870 }
 871
 872 static void release_spapr_tce_table(struct kvmppc_spapr_tce_table *stt)
 873 {
 874         struct kvm *kvm = stt->kvm;
 875         int i;
 876
 877         mutex_lock(&kvm->lock);
 878         list_del(&stt->list);
 879         for (i = 0; i < kvmppc_stt_npages(stt->window_size); i++)
 880                 __free_page(stt->pages[i]);
 881         kfree(stt);
 882         mutex_unlock(&kvm->lock);
 883
 884         kvm_put_kvm(kvm);
 885 }
 886
 887 static int kvm_spapr_tce_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 888 {
 889         struct kvmppc_spapr_tce_table *stt = vma->vm_file->private_data;
 890         struct page *page;
 891
 892         if (vmf->pgoff >= kvmppc_stt_npages(stt->window_size))
 893                 return VM_FAULT_SIGBUS;
 894
 895         page = stt->pages[vmf->pgoff];
 896         get_page(page);
 897         vmf->page = page;
 898         return 0;
 899 }
 900
 901 static const struct vm_operations_struct kvm_spapr_tce_vm_ops = {
 902         .fault = kvm_spapr_tce_fault,
 903 };
 904
 905 static int kvm_spapr_tce_mmap(struct file *file, struct vm_area_struct *vma)
 906 {
 907         vma->vm_ops = &kvm_spapr_tce_vm_ops;
 908         return 0;
 909 }
 910
 911 static int kvm_spapr_tce_release(struct inode *inode, struct file *filp)
 912 {
 913         struct kvmppc_spapr_tce_table *stt = filp->private_data;
 914
 915         release_spapr_tce_table(stt);
 916         return 0;
 917 }
 918
 919 static struct file_operations kvm_spapr_tce_fops = {
 920         .mmap           = kvm_spapr_tce_mmap,
 921         .release        = kvm_spapr_tce_release,
 922 };
 923
 924 long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm,
 925                                    struct kvm_create_spapr_tce *args)
 926 {
 927         struct kvmppc_spapr_tce_table *stt = NULL;
 928         long npages;
 929         int ret = -ENOMEM;
 930         int i;
 931
 932         /* Check this LIOBN hasn't been previously allocated */
 933         list_for_each_entry(stt, &kvm->arch.spapr_tce_tables, list) {
 934                 if (stt->liobn == args->liobn)
 935                         return -EBUSY;
 936         }
 937
 938         npages = kvmppc_stt_npages(args->window_size);
 939
 940         stt = kzalloc(sizeof(*stt) + npages* sizeof(struct page *),
 941                       GFP_KERNEL);
 942         if (!stt)
 943                 goto fail;
 944
 945         stt->liobn = args->liobn;
 946         stt->window_size = args->window_size;
 947         stt->kvm = kvm;
 948
 949         for (i = 0; i < npages; i++) {
 950                 stt->pages[i] = alloc_page(GFP_KERNEL | __GFP_ZERO);
 951                 if (!stt->pages[i])
 952                         goto fail;
 953         }
 954
 955         kvm_get_kvm(kvm);
 956
 957         mutex_lock(&kvm->lock);
 958         list_add(&stt->list, &kvm->arch.spapr_tce_tables);
 959
 960         mutex_unlock(&kvm->lock);
 961
 962         return anon_inode_getfd("kvm-spapr-tce", &kvm_spapr_tce_fops,
 963                                 stt, O_RDWR);
 964
 965 fail:
 966         if (stt) {
 967                 for (i = 0; i < npages; i++)
 968                         if (stt->pages[i])
 969                                 __free_page(stt->pages[i]);
 970
 971                 kfree(stt);
 972         }
 973         return ret;
 974 }
 975
 976 /* Work out RMLS (real mode limit selector) field value for a given RMA size.
 977    Assumes POWER7 or PPC970. */
 978 static inline int lpcr_rmls(unsigned long rma_size)
 979 {
 980         switch (rma_size) {
 981         case 32ul << 20:        /* 32 MB */
 982                 if (cpu_has_feature(CPU_FTR_ARCH_206))
 983                         return 8;       /* only supported on POWER7 */
 984                 return -1;
 985         case 64ul << 20:        /* 64 MB */
 986                 return 3;
 987         case 128ul << 20:       /* 128 MB */
 988                 return 7;
 989         case 256ul << 20:       /* 256 MB */
 990                 return 4;
 991         case 1ul << 30:         /* 1 GB */
 992                 return 2;
 993         case 16ul << 30:        /* 16 GB */
 994                 return 1;
 995         case 256ul << 30:       /* 256 GB */
 996                 return 0;
 997         default:
 998                 return -1;
 999         }
1000 }
1001
1002 static int kvm_rma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1003 {
1004         struct kvmppc_rma_info *ri = vma->vm_file->private_data;
1005         struct page *page;
1006
1007         if (vmf->pgoff >= ri->npages)
1008                 return VM_FAULT_SIGBUS;
1009
1010         page = pfn_to_page(ri->base_pfn + vmf->pgoff);
1011         get_page(page);
1012         vmf->page = page;
1013         return 0;
1014 }
1015
1016 static const struct vm_operations_struct kvm_rma_vm_ops = {
1017         .fault = kvm_rma_fault,
1018 };
1019
1020 static int kvm_rma_mmap(struct file *file, struct vm_area_struct *vma)
1021 {
1022         vma->vm_flags |= VM_RESERVED;
1023         vma->vm_ops = &kvm_rma_vm_ops;
1024         return 0;
1025 }
1026
1027 static int kvm_rma_release(struct inode *inode, struct file *filp)
1028 {
1029         struct kvmppc_rma_info *ri = filp->private_data;
1030
1031         kvm_release_rma(ri);
1032         return 0;
1033 }
1034
1035 static struct file_operations kvm_rma_fops = {
1036         .mmap           = kvm_rma_mmap,
1037         .release        = kvm_rma_release,
1038 };
1039
1040 long kvm_vm_ioctl_allocate_rma(struct kvm *kvm, struct kvm_allocate_rma *ret)
1041 {
1042         struct kvmppc_rma_info *ri;
1043         long fd;
1044
1045         ri = kvm_alloc_rma();
1046         if (!ri)
1047                 return -ENOMEM;
1048
1049         fd = anon_inode_getfd("kvm-rma", &kvm_rma_fops, ri, O_RDWR);
1050         if (fd < 0)
1051                 kvm_release_rma(ri);
1052
1053         ret->rma_size = ri->npages << PAGE_SHIFT;
1054         return fd;
1055 }
1056
1057 static struct page *hva_to_page(unsigned long addr)
1058 {
1059         struct page *page[1];
1060         int npages;
1061
1062         might_sleep();
1063
1064         npages = get_user_pages_fast(addr, 1, 1, page);
1065
1066         if (unlikely(npages != 1))
1067                 return 0;
1068
1069         return page[0];
1070 }
1071
1072 int kvmppc_core_prepare_memory_region(struct kvm *kvm,
1073                                 struct kvm_userspace_memory_region *mem)
1074 {
1075         unsigned long psize, porder;
1076         unsigned long i, npages, totalpages;
1077         unsigned long pg_ix;
1078         struct kvmppc_pginfo *pginfo;
1079         unsigned long hva;
1080         struct kvmppc_rma_info *ri = NULL;
1081         struct page *page;
1082
1083         /* For now, only allow 16MB pages */
1084         porder = LARGE_PAGE_ORDER;
1085         psize = 1ul << porder;
1086         if ((mem->memory_size & (psize - 1)) ||
1087             (mem->guest_phys_addr & (psize - 1))) {
1088                 pr_err("bad memory_size=%llx @ %llx\n",
1089                        mem->memory_size, mem->guest_phys_addr);
1090                 return -EINVAL;
1091         }
1092
1093         npages = mem->memory_size >> porder;
1094         totalpages = (mem->guest_phys_addr + mem->memory_size) >> porder;
1095
1096         /* More memory than we have space to track? */
1097         if (totalpages > (1ul << (MAX_MEM_ORDER - LARGE_PAGE_ORDER)))
1098                 return -EINVAL;
1099
1100         /* Do we already have an RMA registered? */
1101         if (mem->guest_phys_addr == 0 && kvm->arch.rma)
1102                 return -EINVAL;
1103
1104         if (totalpages > kvm->arch.ram_npages)
1105                 kvm->arch.ram_npages = totalpages;
1106
1107         /* Is this one of our preallocated RMAs? */
1108         if (mem->guest_phys_addr == 0) {
1109                 struct vm_area_struct *vma;
1110
1111                 down_read(&current->mm->mmap_sem);
1112                 vma = find_vma(current->mm, mem->userspace_addr);
1113                 if (vma && vma->vm_file &&
1114                     vma->vm_file->f_op == &kvm_rma_fops &&
1115                     mem->userspace_addr == vma->vm_start)
1116                         ri = vma->vm_file->private_data;
1117                 up_read(&current->mm->mmap_sem);
1118                 if (!ri && cpu_has_feature(CPU_FTR_ARCH_201)) {
1119                         pr_err("CPU requires an RMO\n");
1120                         return -EINVAL;
1121                 }
1122         }
1123
1124         if (ri) {
1125                 unsigned long rma_size;
1126                 unsigned long lpcr;
1127                 long rmls;
1128
1129                 rma_size = ri->npages << PAGE_SHIFT;
1130                 if (rma_size > mem->memory_size)
1131                         rma_size = mem->memory_size;
1132                 rmls = lpcr_rmls(rma_size);
1133                 if (rmls < 0) {
1134                         pr_err("Can't use RMA of 0x%lx bytes\n", rma_size);
1135                         return -EINVAL;
1136                 }
1137                 atomic_inc(&ri->use_count);
1138                 kvm->arch.rma = ri;
1139                 kvm->arch.n_rma_pages = rma_size >> porder;
1140
1141                 /* Update LPCR and RMOR */
1142                 lpcr = kvm->arch.lpcr;
1143                 if (cpu_has_feature(CPU_FTR_ARCH_201)) {
1144                         /* PPC970; insert RMLS value (split field) in HID4 */
1145                         lpcr &= ~((1ul << HID4_RMLS0_SH) |
1146                                   (3ul << HID4_RMLS2_SH));
1147                         lpcr |= ((rmls >> 2) << HID4_RMLS0_SH) |
1148                                 ((rmls & 3) << HID4_RMLS2_SH);
1149                         /* RMOR is also in HID4 */
1150                         lpcr |= ((ri->base_pfn >> (26 - PAGE_SHIFT)) & 0xffff)
1151                                 << HID4_RMOR_SH;
1152                 } else {
1153                         /* POWER7 */
1154                         lpcr &= ~(LPCR_VPM0 | LPCR_VRMA_L);
1155                         lpcr |= rmls << LPCR_RMLS_SH;
1156                         kvm->arch.rmor = kvm->arch.rma->base_pfn << PAGE_SHIFT;
1157                 }
1158                 kvm->arch.lpcr = lpcr;
1159                 pr_info("Using RMO at %lx size %lx (LPCR = %lx)\n",
1160                         ri->base_pfn << PAGE_SHIFT, rma_size, lpcr);
1161         }
1162
1163         pg_ix = mem->guest_phys_addr >> porder;
1164         pginfo = kvm->arch.ram_pginfo + pg_ix;
1165         for (i = 0; i < npages; ++i, ++pg_ix) {
1166                 if (ri && pg_ix < kvm->arch.n_rma_pages) {
1167                         pginfo[i].pfn = ri->base_pfn +
1168                                 (pg_ix << (porder - PAGE_SHIFT));
1169                         continue;
1170                 }
1171                 hva = mem->userspace_addr + (i << porder);
1172                 page = hva_to_page(hva);
1173                 if (!page) {
1174                         pr_err("oops, no pfn for hva %lx\n", hva);
1175                         goto err;
1176                 }
1177                 /* Check it's a 16MB page */
1178                 if (!PageHead(page) ||
1179                     compound_order(page) != (LARGE_PAGE_ORDER - PAGE_SHIFT)) {
1180                         pr_err("page at %lx isn't 16MB (o=%d)\n",
1181                                hva, compound_order(page));
1182                         goto err;
1183                 }
1184                 pginfo[i].pfn = page_to_pfn(page);
1185         }
1186
1187         return 0;
1188
1189  err:
1190         return -EINVAL;
1191 }
1192
1193 void kvmppc_core_commit_memory_region(struct kvm *kvm,
1194                                 struct kvm_userspace_memory_region *mem)
1195 {
1196         if (mem->guest_phys_addr == 0 && mem->memory_size != 0 &&
1197             !kvm->arch.rma)
1198                 kvmppc_map_vrma(kvm, mem);
1199 }
1200
1201 int kvmppc_core_init_vm(struct kvm *kvm)
1202 {
1203         long r;
1204         unsigned long npages = 1ul << (MAX_MEM_ORDER - LARGE_PAGE_ORDER);
1205         long err = -ENOMEM;
1206         unsigned long lpcr;
1207
1208         /* Allocate hashed page table */
1209         r = kvmppc_alloc_hpt(kvm);
1210         if (r)
1211                 return r;
1212
1213         INIT_LIST_HEAD(&kvm->arch.spapr_tce_tables);
1214
1215         kvm->arch.ram_pginfo = kzalloc(npages * sizeof(struct kvmppc_pginfo),
1216                                        GFP_KERNEL);
1217         if (!kvm->arch.ram_pginfo) {
1218                 pr_err("kvmppc_core_init_vm: couldn't alloc %lu bytes\n",
1219                        npages * sizeof(struct kvmppc_pginfo));
1220                 goto out_free;
1221         }
1222
1223         kvm->arch.ram_npages = 0;
1224         kvm->arch.ram_psize = 1ul << LARGE_PAGE_ORDER;
1225         kvm->arch.ram_porder = LARGE_PAGE_ORDER;
1226         kvm->arch.rma = NULL;
1227         kvm->arch.n_rma_pages = 0;
1228
1229         kvm->arch.host_sdr1 = mfspr(SPRN_SDR1);
1230
1231         if (cpu_has_feature(CPU_FTR_ARCH_201)) {
1232                 /* PPC970; HID4 is effectively the LPCR */
1233                 unsigned long lpid = kvm->arch.lpid;
1234                 kvm->arch.host_lpid = 0;
1235                 kvm->arch.host_lpcr = lpcr = mfspr(SPRN_HID4);
1236                 lpcr &= ~((3 << HID4_LPID1_SH) | (0xful << HID4_LPID5_SH));
1237                 lpcr |= ((lpid >> 4) << HID4_LPID1_SH) |
1238                         ((lpid & 0xf) << HID4_LPID5_SH);
1239         } else {
1240                 /* POWER7; init LPCR for virtual RMA mode */
1241                 kvm->arch.host_lpid = mfspr(SPRN_LPID);
1242                 kvm->arch.host_lpcr = lpcr = mfspr(SPRN_LPCR);
1243                 lpcr &= LPCR_PECE | LPCR_LPES;
1244                 lpcr |= (4UL << LPCR_DPFD_SH) | LPCR_HDICE |
1245                         LPCR_VPM0 | LPCR_VRMA_L;
1246         }
1247         kvm->arch.lpcr = lpcr;
1248
1249         return 0;
1250
1251  out_free:
1252         kvmppc_free_hpt(kvm);
1253         return err;
1254 }
1255
1256 void kvmppc_core_destroy_vm(struct kvm *kvm)
1257 {
1258         struct kvmppc_pginfo *pginfo;
1259         unsigned long i;
1260
1261         if (kvm->arch.ram_pginfo) {
1262                 pginfo = kvm->arch.ram_pginfo;
1263                 kvm->arch.ram_pginfo = NULL;
1264                 for (i = kvm->arch.n_rma_pages; i < kvm->arch.ram_npages; ++i)
1265                         if (pginfo[i].pfn)
1266                                 put_page(pfn_to_page(pginfo[i].pfn));
1267                 kfree(pginfo);
1268         }
1269         if (kvm->arch.rma) {
1270                 kvm_release_rma(kvm->arch.rma);
1271                 kvm->arch.rma = NULL;
1272         }
1273
1274         kvmppc_free_hpt(kvm);
1275         WARN_ON(!list_empty(&kvm->arch.spapr_tce_tables));
1276 }
1277
1278 /* These are stubs for now */
1279 void kvmppc_mmu_pte_pflush(struct kvm_vcpu *vcpu, ulong pa_start, ulong pa_end)
1280 {
1281 }
1282
1283 /* We don't need to emulate any privileged instructions or dcbz */
1284 int kvmppc_core_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu,
1285                            unsigned int inst, int *advance)
1286 {
1287         return EMULATE_FAIL;
1288 }
1289
1290 int kvmppc_core_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, int rs)
1291 {
1292         return EMULATE_FAIL;
1293 }
1294
1295 int kvmppc_core_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, int rt)
1296 {
1297         return EMULATE_FAIL;
1298 }
1299
1300 static int kvmppc_book3s_hv_init(void)
1301 {
1302         int r;
1303
1304         r = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
1305
1306         if (r)
1307                 return r;
1308
1309         r = kvmppc_mmu_hv_init();
1310
1311         return r;
1312 }
1313
1314 static void kvmppc_book3s_hv_exit(void)
1315 {
1316         kvm_exit();
1317 }
1318
1319 module_init(kvmppc_book3s_hv_init);
1320 module_exit(kvmppc_book3s_hv_exit);