KVM: PPC: Allow use of small pages to back Book3S HV guests
[linux-3.10.git] / 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 #include <linux/hugetlb.h>
53
54 /* #define EXIT_DEBUG */
55 /* #define EXIT_DEBUG_SIMPLE */
56 /* #define EXIT_DEBUG_INT */
57
58 static void kvmppc_end_cede(struct kvm_vcpu *vcpu);
59 static int kvmppc_hv_setup_rma(struct kvm_vcpu *vcpu);
60
61 void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
62 {
63         local_paca->kvm_hstate.kvm_vcpu = vcpu;
64         local_paca->kvm_hstate.kvm_vcore = vcpu->arch.vcore;
65 }
66
67 void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
68 {
69 }
70
71 void kvmppc_set_msr(struct kvm_vcpu *vcpu, u64 msr)
72 {
73         vcpu->arch.shregs.msr = msr;
74         kvmppc_end_cede(vcpu);
75 }
76
77 void kvmppc_set_pvr(struct kvm_vcpu *vcpu, u32 pvr)
78 {
79         vcpu->arch.pvr = pvr;
80 }
81
82 void kvmppc_dump_regs(struct kvm_vcpu *vcpu)
83 {
84         int r;
85
86         pr_err("vcpu %p (%d):\n", vcpu, vcpu->vcpu_id);
87         pr_err("pc  = %.16lx  msr = %.16llx  trap = %x\n",
88                vcpu->arch.pc, vcpu->arch.shregs.msr, vcpu->arch.trap);
89         for (r = 0; r < 16; ++r)
90                 pr_err("r%2d = %.16lx  r%d = %.16lx\n",
91                        r, kvmppc_get_gpr(vcpu, r),
92                        r+16, kvmppc_get_gpr(vcpu, r+16));
93         pr_err("ctr = %.16lx  lr  = %.16lx\n",
94                vcpu->arch.ctr, vcpu->arch.lr);
95         pr_err("srr0 = %.16llx srr1 = %.16llx\n",
96                vcpu->arch.shregs.srr0, vcpu->arch.shregs.srr1);
97         pr_err("sprg0 = %.16llx sprg1 = %.16llx\n",
98                vcpu->arch.shregs.sprg0, vcpu->arch.shregs.sprg1);
99         pr_err("sprg2 = %.16llx sprg3 = %.16llx\n",
100                vcpu->arch.shregs.sprg2, vcpu->arch.shregs.sprg3);
101         pr_err("cr = %.8x  xer = %.16lx  dsisr = %.8x\n",
102                vcpu->arch.cr, vcpu->arch.xer, vcpu->arch.shregs.dsisr);
103         pr_err("dar = %.16llx\n", vcpu->arch.shregs.dar);
104         pr_err("fault dar = %.16lx dsisr = %.8x\n",
105                vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
106         pr_err("SLB (%d entries):\n", vcpu->arch.slb_max);
107         for (r = 0; r < vcpu->arch.slb_max; ++r)
108                 pr_err("  ESID = %.16llx VSID = %.16llx\n",
109                        vcpu->arch.slb[r].orige, vcpu->arch.slb[r].origv);
110         pr_err("lpcr = %.16lx sdr1 = %.16lx last_inst = %.8x\n",
111                vcpu->kvm->arch.lpcr, vcpu->kvm->arch.sdr1,
112                vcpu->arch.last_inst);
113 }
114
115 struct kvm_vcpu *kvmppc_find_vcpu(struct kvm *kvm, int id)
116 {
117         int r;
118         struct kvm_vcpu *v, *ret = NULL;
119
120         mutex_lock(&kvm->lock);
121         kvm_for_each_vcpu(r, v, kvm) {
122                 if (v->vcpu_id == id) {
123                         ret = v;
124                         break;
125                 }
126         }
127         mutex_unlock(&kvm->lock);
128         return ret;
129 }
130
131 static void init_vpa(struct kvm_vcpu *vcpu, struct lppaca *vpa)
132 {
133         vpa->shared_proc = 1;
134         vpa->yield_count = 1;
135 }
136
137 static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu,
138                                        unsigned long flags,
139                                        unsigned long vcpuid, unsigned long vpa)
140 {
141         struct kvm *kvm = vcpu->kvm;
142         unsigned long len, nb;
143         void *va;
144         struct kvm_vcpu *tvcpu;
145         int err = H_PARAMETER;
146
147         tvcpu = kvmppc_find_vcpu(kvm, vcpuid);
148         if (!tvcpu)
149                 return H_PARAMETER;
150
151         flags >>= 63 - 18;
152         flags &= 7;
153         if (flags == 0 || flags == 4)
154                 return H_PARAMETER;
155         if (flags < 4) {
156                 if (vpa & 0x7f)
157                         return H_PARAMETER;
158                 if (flags >= 2 && !tvcpu->arch.vpa)
159                         return H_RESOURCE;
160                 /* registering new area; convert logical addr to real */
161                 va = kvmppc_pin_guest_page(kvm, vpa, &nb);
162                 if (va == NULL)
163                         return H_PARAMETER;
164                 if (flags <= 1)
165                         len = *(unsigned short *)(va + 4);
166                 else
167                         len = *(unsigned int *)(va + 4);
168                 if (len > nb)
169                         goto out_unpin;
170                 switch (flags) {
171                 case 1:         /* register VPA */
172                         if (len < 640)
173                                 goto out_unpin;
174                         if (tvcpu->arch.vpa)
175                                 kvmppc_unpin_guest_page(kvm, vcpu->arch.vpa);
176                         tvcpu->arch.vpa = va;
177                         init_vpa(vcpu, va);
178                         break;
179                 case 2:         /* register DTL */
180                         if (len < 48)
181                                 goto out_unpin;
182                         len -= len % 48;
183                         if (tvcpu->arch.dtl)
184                                 kvmppc_unpin_guest_page(kvm, vcpu->arch.dtl);
185                         tvcpu->arch.dtl = va;
186                         tvcpu->arch.dtl_end = va + len;
187                         break;
188                 case 3:         /* register SLB shadow buffer */
189                         if (len < 16)
190                                 goto out_unpin;
191                         if (tvcpu->arch.slb_shadow)
192                                 kvmppc_unpin_guest_page(kvm, vcpu->arch.slb_shadow);
193                         tvcpu->arch.slb_shadow = va;
194                         break;
195                 }
196         } else {
197                 switch (flags) {
198                 case 5:         /* unregister VPA */
199                         if (tvcpu->arch.slb_shadow || tvcpu->arch.dtl)
200                                 return H_RESOURCE;
201                         if (!tvcpu->arch.vpa)
202                                 break;
203                         kvmppc_unpin_guest_page(kvm, tvcpu->arch.vpa);
204                         tvcpu->arch.vpa = NULL;
205                         break;
206                 case 6:         /* unregister DTL */
207                         if (!tvcpu->arch.dtl)
208                                 break;
209                         kvmppc_unpin_guest_page(kvm, tvcpu->arch.dtl);
210                         tvcpu->arch.dtl = NULL;
211                         break;
212                 case 7:         /* unregister SLB shadow buffer */
213                         if (!tvcpu->arch.slb_shadow)
214                                 break;
215                         kvmppc_unpin_guest_page(kvm, tvcpu->arch.slb_shadow);
216                         tvcpu->arch.slb_shadow = NULL;
217                         break;
218                 }
219         }
220         return H_SUCCESS;
221
222  out_unpin:
223         kvmppc_unpin_guest_page(kvm, va);
224         return err;
225 }
226
227 int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu)
228 {
229         unsigned long req = kvmppc_get_gpr(vcpu, 3);
230         unsigned long target, ret = H_SUCCESS;
231         struct kvm_vcpu *tvcpu;
232
233         switch (req) {
234         case H_ENTER:
235                 ret = kvmppc_virtmode_h_enter(vcpu, kvmppc_get_gpr(vcpu, 4),
236                                               kvmppc_get_gpr(vcpu, 5),
237                                               kvmppc_get_gpr(vcpu, 6),
238                                               kvmppc_get_gpr(vcpu, 7));
239                 break;
240         case H_CEDE:
241                 break;
242         case H_PROD:
243                 target = kvmppc_get_gpr(vcpu, 4);
244                 tvcpu = kvmppc_find_vcpu(vcpu->kvm, target);
245                 if (!tvcpu) {
246                         ret = H_PARAMETER;
247                         break;
248                 }
249                 tvcpu->arch.prodded = 1;
250                 smp_mb();
251                 if (vcpu->arch.ceded) {
252                         if (waitqueue_active(&vcpu->wq)) {
253                                 wake_up_interruptible(&vcpu->wq);
254                                 vcpu->stat.halt_wakeup++;
255                         }
256                 }
257                 break;
258         case H_CONFER:
259                 break;
260         case H_REGISTER_VPA:
261                 ret = do_h_register_vpa(vcpu, kvmppc_get_gpr(vcpu, 4),
262                                         kvmppc_get_gpr(vcpu, 5),
263                                         kvmppc_get_gpr(vcpu, 6));
264                 break;
265         default:
266                 return RESUME_HOST;
267         }
268         kvmppc_set_gpr(vcpu, 3, ret);
269         vcpu->arch.hcall_needed = 0;
270         return RESUME_GUEST;
271 }
272
273 static int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
274                               struct task_struct *tsk)
275 {
276         int r = RESUME_HOST;
277
278         vcpu->stat.sum_exits++;
279
280         run->exit_reason = KVM_EXIT_UNKNOWN;
281         run->ready_for_interrupt_injection = 1;
282         switch (vcpu->arch.trap) {
283         /* We're good on these - the host merely wanted to get our attention */
284         case BOOK3S_INTERRUPT_HV_DECREMENTER:
285                 vcpu->stat.dec_exits++;
286                 r = RESUME_GUEST;
287                 break;
288         case BOOK3S_INTERRUPT_EXTERNAL:
289                 vcpu->stat.ext_intr_exits++;
290                 r = RESUME_GUEST;
291                 break;
292         case BOOK3S_INTERRUPT_PERFMON:
293                 r = RESUME_GUEST;
294                 break;
295         case BOOK3S_INTERRUPT_PROGRAM:
296         {
297                 ulong flags;
298                 /*
299                  * Normally program interrupts are delivered directly
300                  * to the guest by the hardware, but we can get here
301                  * as a result of a hypervisor emulation interrupt
302                  * (e40) getting turned into a 700 by BML RTAS.
303                  */
304                 flags = vcpu->arch.shregs.msr & 0x1f0000ull;
305                 kvmppc_core_queue_program(vcpu, flags);
306                 r = RESUME_GUEST;
307                 break;
308         }
309         case BOOK3S_INTERRUPT_SYSCALL:
310         {
311                 /* hcall - punt to userspace */
312                 int i;
313
314                 if (vcpu->arch.shregs.msr & MSR_PR) {
315                         /* sc 1 from userspace - reflect to guest syscall */
316                         kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_SYSCALL);
317                         r = RESUME_GUEST;
318                         break;
319                 }
320                 run->papr_hcall.nr = kvmppc_get_gpr(vcpu, 3);
321                 for (i = 0; i < 9; ++i)
322                         run->papr_hcall.args[i] = kvmppc_get_gpr(vcpu, 4 + i);
323                 run->exit_reason = KVM_EXIT_PAPR_HCALL;
324                 vcpu->arch.hcall_needed = 1;
325                 r = RESUME_HOST;
326                 break;
327         }
328         /*
329          * We get these next two if the guest does a bad real-mode access,
330          * as we have enabled VRMA (virtualized real mode area) mode in the
331          * LPCR.  We just generate an appropriate DSI/ISI to the guest.
332          */
333         case BOOK3S_INTERRUPT_H_DATA_STORAGE:
334                 vcpu->arch.shregs.dsisr = vcpu->arch.fault_dsisr;
335                 vcpu->arch.shregs.dar = vcpu->arch.fault_dar;
336                 kvmppc_inject_interrupt(vcpu, BOOK3S_INTERRUPT_DATA_STORAGE, 0);
337                 r = RESUME_GUEST;
338                 break;
339         case BOOK3S_INTERRUPT_H_INST_STORAGE:
340                 kvmppc_inject_interrupt(vcpu, BOOK3S_INTERRUPT_INST_STORAGE,
341                                         0x08000000);
342                 r = RESUME_GUEST;
343                 break;
344         /*
345          * This occurs if the guest executes an illegal instruction.
346          * We just generate a program interrupt to the guest, since
347          * we don't emulate any guest instructions at this stage.
348          */
349         case BOOK3S_INTERRUPT_H_EMUL_ASSIST:
350                 kvmppc_core_queue_program(vcpu, 0x80000);
351                 r = RESUME_GUEST;
352                 break;
353         default:
354                 kvmppc_dump_regs(vcpu);
355                 printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n",
356                         vcpu->arch.trap, kvmppc_get_pc(vcpu),
357                         vcpu->arch.shregs.msr);
358                 r = RESUME_HOST;
359                 BUG();
360                 break;
361         }
362
363         return r;
364 }
365
366 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
367                                   struct kvm_sregs *sregs)
368 {
369         int i;
370
371         sregs->pvr = vcpu->arch.pvr;
372
373         memset(sregs, 0, sizeof(struct kvm_sregs));
374         for (i = 0; i < vcpu->arch.slb_max; i++) {
375                 sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige;
376                 sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv;
377         }
378
379         return 0;
380 }
381
382 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
383                                   struct kvm_sregs *sregs)
384 {
385         int i, j;
386
387         kvmppc_set_pvr(vcpu, sregs->pvr);
388
389         j = 0;
390         for (i = 0; i < vcpu->arch.slb_nr; i++) {
391                 if (sregs->u.s.ppc64.slb[i].slbe & SLB_ESID_V) {
392                         vcpu->arch.slb[j].orige = sregs->u.s.ppc64.slb[i].slbe;
393                         vcpu->arch.slb[j].origv = sregs->u.s.ppc64.slb[i].slbv;
394                         ++j;
395                 }
396         }
397         vcpu->arch.slb_max = j;
398
399         return 0;
400 }
401
402 int kvmppc_core_check_processor_compat(void)
403 {
404         if (cpu_has_feature(CPU_FTR_HVMODE))
405                 return 0;
406         return -EIO;
407 }
408
409 struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
410 {
411         struct kvm_vcpu *vcpu;
412         int err = -EINVAL;
413         int core;
414         struct kvmppc_vcore *vcore;
415
416         core = id / threads_per_core;
417         if (core >= KVM_MAX_VCORES)
418                 goto out;
419
420         err = -ENOMEM;
421         vcpu = kzalloc(sizeof(struct kvm_vcpu), GFP_KERNEL);
422         if (!vcpu)
423                 goto out;
424
425         err = kvm_vcpu_init(vcpu, kvm, id);
426         if (err)
427                 goto free_vcpu;
428
429         vcpu->arch.shared = &vcpu->arch.shregs;
430         vcpu->arch.last_cpu = -1;
431         vcpu->arch.mmcr[0] = MMCR0_FC;
432         vcpu->arch.ctrl = CTRL_RUNLATCH;
433         /* default to host PVR, since we can't spoof it */
434         vcpu->arch.pvr = mfspr(SPRN_PVR);
435         kvmppc_set_pvr(vcpu, vcpu->arch.pvr);
436
437         kvmppc_mmu_book3s_hv_init(vcpu);
438
439         /*
440          * We consider the vcpu stopped until we see the first run ioctl for it.
441          */
442         vcpu->arch.state = KVMPPC_VCPU_STOPPED;
443
444         init_waitqueue_head(&vcpu->arch.cpu_run);
445
446         mutex_lock(&kvm->lock);
447         vcore = kvm->arch.vcores[core];
448         if (!vcore) {
449                 vcore = kzalloc(sizeof(struct kvmppc_vcore), GFP_KERNEL);
450                 if (vcore) {
451                         INIT_LIST_HEAD(&vcore->runnable_threads);
452                         spin_lock_init(&vcore->lock);
453                         init_waitqueue_head(&vcore->wq);
454                 }
455                 kvm->arch.vcores[core] = vcore;
456         }
457         mutex_unlock(&kvm->lock);
458
459         if (!vcore)
460                 goto free_vcpu;
461
462         spin_lock(&vcore->lock);
463         ++vcore->num_threads;
464         spin_unlock(&vcore->lock);
465         vcpu->arch.vcore = vcore;
466
467         vcpu->arch.cpu_type = KVM_CPU_3S_64;
468         kvmppc_sanity_check(vcpu);
469
470         return vcpu;
471
472 free_vcpu:
473         kfree(vcpu);
474 out:
475         return ERR_PTR(err);
476 }
477
478 void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
479 {
480         if (vcpu->arch.dtl)
481                 kvmppc_unpin_guest_page(vcpu->kvm, vcpu->arch.dtl);
482         if (vcpu->arch.slb_shadow)
483                 kvmppc_unpin_guest_page(vcpu->kvm, vcpu->arch.slb_shadow);
484         if (vcpu->arch.vpa)
485                 kvmppc_unpin_guest_page(vcpu->kvm, vcpu->arch.vpa);
486         kvm_vcpu_uninit(vcpu);
487         kfree(vcpu);
488 }
489
490 static void kvmppc_set_timer(struct kvm_vcpu *vcpu)
491 {
492         unsigned long dec_nsec, now;
493
494         now = get_tb();
495         if (now > vcpu->arch.dec_expires) {
496                 /* decrementer has already gone negative */
497                 kvmppc_core_queue_dec(vcpu);
498                 kvmppc_core_prepare_to_enter(vcpu);
499                 return;
500         }
501         dec_nsec = (vcpu->arch.dec_expires - now) * NSEC_PER_SEC
502                    / tb_ticks_per_sec;
503         hrtimer_start(&vcpu->arch.dec_timer, ktime_set(0, dec_nsec),
504                       HRTIMER_MODE_REL);
505         vcpu->arch.timer_running = 1;
506 }
507
508 static void kvmppc_end_cede(struct kvm_vcpu *vcpu)
509 {
510         vcpu->arch.ceded = 0;
511         if (vcpu->arch.timer_running) {
512                 hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
513                 vcpu->arch.timer_running = 0;
514         }
515 }
516
517 extern int __kvmppc_vcore_entry(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu);
518 extern void xics_wake_cpu(int cpu);
519
520 static void kvmppc_remove_runnable(struct kvmppc_vcore *vc,
521                                    struct kvm_vcpu *vcpu)
522 {
523         struct kvm_vcpu *v;
524
525         if (vcpu->arch.state != KVMPPC_VCPU_RUNNABLE)
526                 return;
527         vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
528         --vc->n_runnable;
529         ++vc->n_busy;
530         /* decrement the physical thread id of each following vcpu */
531         v = vcpu;
532         list_for_each_entry_continue(v, &vc->runnable_threads, arch.run_list)
533                 --v->arch.ptid;
534         list_del(&vcpu->arch.run_list);
535 }
536
537 static void kvmppc_start_thread(struct kvm_vcpu *vcpu)
538 {
539         int cpu;
540         struct paca_struct *tpaca;
541         struct kvmppc_vcore *vc = vcpu->arch.vcore;
542
543         if (vcpu->arch.timer_running) {
544                 hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
545                 vcpu->arch.timer_running = 0;
546         }
547         cpu = vc->pcpu + vcpu->arch.ptid;
548         tpaca = &paca[cpu];
549         tpaca->kvm_hstate.kvm_vcpu = vcpu;
550         tpaca->kvm_hstate.kvm_vcore = vc;
551         tpaca->kvm_hstate.napping = 0;
552         vcpu->cpu = vc->pcpu;
553         smp_wmb();
554 #if defined(CONFIG_PPC_ICP_NATIVE) && defined(CONFIG_SMP)
555         if (vcpu->arch.ptid) {
556                 tpaca->cpu_start = 0x80;
557                 wmb();
558                 xics_wake_cpu(cpu);
559                 ++vc->n_woken;
560         }
561 #endif
562 }
563
564 static void kvmppc_wait_for_nap(struct kvmppc_vcore *vc)
565 {
566         int i;
567
568         HMT_low();
569         i = 0;
570         while (vc->nap_count < vc->n_woken) {
571                 if (++i >= 1000000) {
572                         pr_err("kvmppc_wait_for_nap timeout %d %d\n",
573                                vc->nap_count, vc->n_woken);
574                         break;
575                 }
576                 cpu_relax();
577         }
578         HMT_medium();
579 }
580
581 /*
582  * Check that we are on thread 0 and that any other threads in
583  * this core are off-line.
584  */
585 static int on_primary_thread(void)
586 {
587         int cpu = smp_processor_id();
588         int thr = cpu_thread_in_core(cpu);
589
590         if (thr)
591                 return 0;
592         while (++thr < threads_per_core)
593                 if (cpu_online(cpu + thr))
594                         return 0;
595         return 1;
596 }
597
598 /*
599  * Run a set of guest threads on a physical core.
600  * Called with vc->lock held.
601  */
602 static int kvmppc_run_core(struct kvmppc_vcore *vc)
603 {
604         struct kvm_vcpu *vcpu, *vcpu0, *vnext;
605         long ret;
606         u64 now;
607         int ptid;
608
609         /* don't start if any threads have a signal pending */
610         list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
611                 if (signal_pending(vcpu->arch.run_task))
612                         return 0;
613
614         /*
615          * Make sure we are running on thread 0, and that
616          * secondary threads are offline.
617          * XXX we should also block attempts to bring any
618          * secondary threads online.
619          */
620         if (threads_per_core > 1 && !on_primary_thread()) {
621                 list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
622                         vcpu->arch.ret = -EBUSY;
623                 goto out;
624         }
625
626         /*
627          * Assign physical thread IDs, first to non-ceded vcpus
628          * and then to ceded ones.
629          */
630         ptid = 0;
631         vcpu0 = NULL;
632         list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) {
633                 if (!vcpu->arch.ceded) {
634                         if (!ptid)
635                                 vcpu0 = vcpu;
636                         vcpu->arch.ptid = ptid++;
637                 }
638         }
639         if (!vcpu0)
640                 return 0;               /* nothing to run */
641         list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
642                 if (vcpu->arch.ceded)
643                         vcpu->arch.ptid = ptid++;
644
645         vc->n_woken = 0;
646         vc->nap_count = 0;
647         vc->entry_exit_count = 0;
648         vc->vcore_state = VCORE_RUNNING;
649         vc->in_guest = 0;
650         vc->pcpu = smp_processor_id();
651         vc->napping_threads = 0;
652         list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
653                 kvmppc_start_thread(vcpu);
654
655         preempt_disable();
656         spin_unlock(&vc->lock);
657
658         kvm_guest_enter();
659         __kvmppc_vcore_entry(NULL, vcpu0);
660
661         spin_lock(&vc->lock);
662         /* disable sending of IPIs on virtual external irqs */
663         list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
664                 vcpu->cpu = -1;
665         /* wait for secondary threads to finish writing their state to memory */
666         if (vc->nap_count < vc->n_woken)
667                 kvmppc_wait_for_nap(vc);
668         /* prevent other vcpu threads from doing kvmppc_start_thread() now */
669         vc->vcore_state = VCORE_EXITING;
670         spin_unlock(&vc->lock);
671
672         /* make sure updates to secondary vcpu structs are visible now */
673         smp_mb();
674         kvm_guest_exit();
675
676         preempt_enable();
677         kvm_resched(vcpu);
678
679         now = get_tb();
680         list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) {
681                 /* cancel pending dec exception if dec is positive */
682                 if (now < vcpu->arch.dec_expires &&
683                     kvmppc_core_pending_dec(vcpu))
684                         kvmppc_core_dequeue_dec(vcpu);
685
686                 ret = RESUME_GUEST;
687                 if (vcpu->arch.trap)
688                         ret = kvmppc_handle_exit(vcpu->arch.kvm_run, vcpu,
689                                                  vcpu->arch.run_task);
690
691                 vcpu->arch.ret = ret;
692                 vcpu->arch.trap = 0;
693
694                 if (vcpu->arch.ceded) {
695                         if (ret != RESUME_GUEST)
696                                 kvmppc_end_cede(vcpu);
697                         else
698                                 kvmppc_set_timer(vcpu);
699                 }
700         }
701
702         spin_lock(&vc->lock);
703  out:
704         vc->vcore_state = VCORE_INACTIVE;
705         list_for_each_entry_safe(vcpu, vnext, &vc->runnable_threads,
706                                  arch.run_list) {
707                 if (vcpu->arch.ret != RESUME_GUEST) {
708                         kvmppc_remove_runnable(vc, vcpu);
709                         wake_up(&vcpu->arch.cpu_run);
710                 }
711         }
712
713         return 1;
714 }
715
716 /*
717  * Wait for some other vcpu thread to execute us, and
718  * wake us up when we need to handle something in the host.
719  */
720 static void kvmppc_wait_for_exec(struct kvm_vcpu *vcpu, int wait_state)
721 {
722         DEFINE_WAIT(wait);
723
724         prepare_to_wait(&vcpu->arch.cpu_run, &wait, wait_state);
725         if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE)
726                 schedule();
727         finish_wait(&vcpu->arch.cpu_run, &wait);
728 }
729
730 /*
731  * All the vcpus in this vcore are idle, so wait for a decrementer
732  * or external interrupt to one of the vcpus.  vc->lock is held.
733  */
734 static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
735 {
736         DEFINE_WAIT(wait);
737         struct kvm_vcpu *v;
738         int all_idle = 1;
739
740         prepare_to_wait(&vc->wq, &wait, TASK_INTERRUPTIBLE);
741         vc->vcore_state = VCORE_SLEEPING;
742         spin_unlock(&vc->lock);
743         list_for_each_entry(v, &vc->runnable_threads, arch.run_list) {
744                 if (!v->arch.ceded || v->arch.pending_exceptions) {
745                         all_idle = 0;
746                         break;
747                 }
748         }
749         if (all_idle)
750                 schedule();
751         finish_wait(&vc->wq, &wait);
752         spin_lock(&vc->lock);
753         vc->vcore_state = VCORE_INACTIVE;
754 }
755
756 static int kvmppc_run_vcpu(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
757 {
758         int n_ceded;
759         int prev_state;
760         struct kvmppc_vcore *vc;
761         struct kvm_vcpu *v, *vn;
762
763         kvm_run->exit_reason = 0;
764         vcpu->arch.ret = RESUME_GUEST;
765         vcpu->arch.trap = 0;
766
767         /*
768          * Synchronize with other threads in this virtual core
769          */
770         vc = vcpu->arch.vcore;
771         spin_lock(&vc->lock);
772         vcpu->arch.ceded = 0;
773         vcpu->arch.run_task = current;
774         vcpu->arch.kvm_run = kvm_run;
775         prev_state = vcpu->arch.state;
776         vcpu->arch.state = KVMPPC_VCPU_RUNNABLE;
777         list_add_tail(&vcpu->arch.run_list, &vc->runnable_threads);
778         ++vc->n_runnable;
779
780         /*
781          * This happens the first time this is called for a vcpu.
782          * If the vcore is already running, we may be able to start
783          * this thread straight away and have it join in.
784          */
785         if (prev_state == KVMPPC_VCPU_STOPPED) {
786                 if (vc->vcore_state == VCORE_RUNNING &&
787                     VCORE_EXIT_COUNT(vc) == 0) {
788                         vcpu->arch.ptid = vc->n_runnable - 1;
789                         kvmppc_start_thread(vcpu);
790                 }
791
792         } else if (prev_state == KVMPPC_VCPU_BUSY_IN_HOST)
793                 --vc->n_busy;
794
795         while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE &&
796                !signal_pending(current)) {
797                 if (vc->n_busy || vc->vcore_state != VCORE_INACTIVE) {
798                         spin_unlock(&vc->lock);
799                         kvmppc_wait_for_exec(vcpu, TASK_INTERRUPTIBLE);
800                         spin_lock(&vc->lock);
801                         continue;
802                 }
803                 n_ceded = 0;
804                 list_for_each_entry(v, &vc->runnable_threads, arch.run_list)
805                         n_ceded += v->arch.ceded;
806                 if (n_ceded == vc->n_runnable)
807                         kvmppc_vcore_blocked(vc);
808                 else
809                         kvmppc_run_core(vc);
810
811                 list_for_each_entry_safe(v, vn, &vc->runnable_threads,
812                                          arch.run_list) {
813                         kvmppc_core_prepare_to_enter(v);
814                         if (signal_pending(v->arch.run_task)) {
815                                 kvmppc_remove_runnable(vc, v);
816                                 v->stat.signal_exits++;
817                                 v->arch.kvm_run->exit_reason = KVM_EXIT_INTR;
818                                 v->arch.ret = -EINTR;
819                                 wake_up(&v->arch.cpu_run);
820                         }
821                 }
822         }
823
824         if (signal_pending(current)) {
825                 if (vc->vcore_state == VCORE_RUNNING ||
826                     vc->vcore_state == VCORE_EXITING) {
827                         spin_unlock(&vc->lock);
828                         kvmppc_wait_for_exec(vcpu, TASK_UNINTERRUPTIBLE);
829                         spin_lock(&vc->lock);
830                 }
831                 if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) {
832                         kvmppc_remove_runnable(vc, vcpu);
833                         vcpu->stat.signal_exits++;
834                         kvm_run->exit_reason = KVM_EXIT_INTR;
835                         vcpu->arch.ret = -EINTR;
836                 }
837         }
838
839         spin_unlock(&vc->lock);
840         return vcpu->arch.ret;
841 }
842
843 int kvmppc_vcpu_run(struct kvm_run *run, struct kvm_vcpu *vcpu)
844 {
845         int r;
846
847         if (!vcpu->arch.sane) {
848                 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
849                 return -EINVAL;
850         }
851
852         kvmppc_core_prepare_to_enter(vcpu);
853
854         /* No need to go into the guest when all we'll do is come back out */
855         if (signal_pending(current)) {
856                 run->exit_reason = KVM_EXIT_INTR;
857                 return -EINTR;
858         }
859
860         /* On the first time here, set up VRMA or RMA */
861         if (!vcpu->kvm->arch.rma_setup_done) {
862                 r = kvmppc_hv_setup_rma(vcpu);
863                 if (r)
864                         return r;
865         }
866
867         flush_fp_to_thread(current);
868         flush_altivec_to_thread(current);
869         flush_vsx_to_thread(current);
870         vcpu->arch.wqp = &vcpu->arch.vcore->wq;
871
872         do {
873                 r = kvmppc_run_vcpu(run, vcpu);
874
875                 if (run->exit_reason == KVM_EXIT_PAPR_HCALL &&
876                     !(vcpu->arch.shregs.msr & MSR_PR)) {
877                         r = kvmppc_pseries_do_hcall(vcpu);
878                         kvmppc_core_prepare_to_enter(vcpu);
879                 }
880         } while (r == RESUME_GUEST);
881         return r;
882 }
883
884 static long kvmppc_stt_npages(unsigned long window_size)
885 {
886         return ALIGN((window_size >> SPAPR_TCE_SHIFT)
887                      * sizeof(u64), PAGE_SIZE) / PAGE_SIZE;
888 }
889
890 static void release_spapr_tce_table(struct kvmppc_spapr_tce_table *stt)
891 {
892         struct kvm *kvm = stt->kvm;
893         int i;
894
895         mutex_lock(&kvm->lock);
896         list_del(&stt->list);
897         for (i = 0; i < kvmppc_stt_npages(stt->window_size); i++)
898                 __free_page(stt->pages[i]);
899         kfree(stt);
900         mutex_unlock(&kvm->lock);
901
902         kvm_put_kvm(kvm);
903 }
904
905 static int kvm_spapr_tce_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
906 {
907         struct kvmppc_spapr_tce_table *stt = vma->vm_file->private_data;
908         struct page *page;
909
910         if (vmf->pgoff >= kvmppc_stt_npages(stt->window_size))
911                 return VM_FAULT_SIGBUS;
912
913         page = stt->pages[vmf->pgoff];
914         get_page(page);
915         vmf->page = page;
916         return 0;
917 }
918
919 static const struct vm_operations_struct kvm_spapr_tce_vm_ops = {
920         .fault = kvm_spapr_tce_fault,
921 };
922
923 static int kvm_spapr_tce_mmap(struct file *file, struct vm_area_struct *vma)
924 {
925         vma->vm_ops = &kvm_spapr_tce_vm_ops;
926         return 0;
927 }
928
929 static int kvm_spapr_tce_release(struct inode *inode, struct file *filp)
930 {
931         struct kvmppc_spapr_tce_table *stt = filp->private_data;
932
933         release_spapr_tce_table(stt);
934         return 0;
935 }
936
937 static struct file_operations kvm_spapr_tce_fops = {
938         .mmap           = kvm_spapr_tce_mmap,
939         .release        = kvm_spapr_tce_release,
940 };
941
942 long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm,
943                                    struct kvm_create_spapr_tce *args)
944 {
945         struct kvmppc_spapr_tce_table *stt = NULL;
946         long npages;
947         int ret = -ENOMEM;
948         int i;
949
950         /* Check this LIOBN hasn't been previously allocated */
951         list_for_each_entry(stt, &kvm->arch.spapr_tce_tables, list) {
952                 if (stt->liobn == args->liobn)
953                         return -EBUSY;
954         }
955
956         npages = kvmppc_stt_npages(args->window_size);
957
958         stt = kzalloc(sizeof(*stt) + npages* sizeof(struct page *),
959                       GFP_KERNEL);
960         if (!stt)
961                 goto fail;
962
963         stt->liobn = args->liobn;
964         stt->window_size = args->window_size;
965         stt->kvm = kvm;
966
967         for (i = 0; i < npages; i++) {
968                 stt->pages[i] = alloc_page(GFP_KERNEL | __GFP_ZERO);
969                 if (!stt->pages[i])
970                         goto fail;
971         }
972
973         kvm_get_kvm(kvm);
974
975         mutex_lock(&kvm->lock);
976         list_add(&stt->list, &kvm->arch.spapr_tce_tables);
977
978         mutex_unlock(&kvm->lock);
979
980         return anon_inode_getfd("kvm-spapr-tce", &kvm_spapr_tce_fops,
981                                 stt, O_RDWR);
982
983 fail:
984         if (stt) {
985                 for (i = 0; i < npages; i++)
986                         if (stt->pages[i])
987                                 __free_page(stt->pages[i]);
988
989                 kfree(stt);
990         }
991         return ret;
992 }
993
994 /* Work out RMLS (real mode limit selector) field value for a given RMA size.
995    Assumes POWER7 or PPC970. */
996 static inline int lpcr_rmls(unsigned long rma_size)
997 {
998         switch (rma_size) {
999         case 32ul << 20:        /* 32 MB */
1000                 if (cpu_has_feature(CPU_FTR_ARCH_206))
1001                         return 8;       /* only supported on POWER7 */
1002                 return -1;
1003         case 64ul << 20:        /* 64 MB */
1004                 return 3;
1005         case 128ul << 20:       /* 128 MB */
1006                 return 7;
1007         case 256ul << 20:       /* 256 MB */
1008                 return 4;
1009         case 1ul << 30:         /* 1 GB */
1010                 return 2;
1011         case 16ul << 30:        /* 16 GB */
1012                 return 1;
1013         case 256ul << 30:       /* 256 GB */
1014                 return 0;
1015         default:
1016                 return -1;
1017         }
1018 }
1019
1020 static int kvm_rma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1021 {
1022         struct kvmppc_rma_info *ri = vma->vm_file->private_data;
1023         struct page *page;
1024
1025         if (vmf->pgoff >= ri->npages)
1026                 return VM_FAULT_SIGBUS;
1027
1028         page = pfn_to_page(ri->base_pfn + vmf->pgoff);
1029         get_page(page);
1030         vmf->page = page;
1031         return 0;
1032 }
1033
1034 static const struct vm_operations_struct kvm_rma_vm_ops = {
1035         .fault = kvm_rma_fault,
1036 };
1037
1038 static int kvm_rma_mmap(struct file *file, struct vm_area_struct *vma)
1039 {
1040         vma->vm_flags |= VM_RESERVED;
1041         vma->vm_ops = &kvm_rma_vm_ops;
1042         return 0;
1043 }
1044
1045 static int kvm_rma_release(struct inode *inode, struct file *filp)
1046 {
1047         struct kvmppc_rma_info *ri = filp->private_data;
1048
1049         kvm_release_rma(ri);
1050         return 0;
1051 }
1052
1053 static struct file_operations kvm_rma_fops = {
1054         .mmap           = kvm_rma_mmap,
1055         .release        = kvm_rma_release,
1056 };
1057
1058 long kvm_vm_ioctl_allocate_rma(struct kvm *kvm, struct kvm_allocate_rma *ret)
1059 {
1060         struct kvmppc_rma_info *ri;
1061         long fd;
1062
1063         ri = kvm_alloc_rma();
1064         if (!ri)
1065                 return -ENOMEM;
1066
1067         fd = anon_inode_getfd("kvm-rma", &kvm_rma_fops, ri, O_RDWR);
1068         if (fd < 0)
1069                 kvm_release_rma(ri);
1070
1071         ret->rma_size = ri->npages << PAGE_SHIFT;
1072         return fd;
1073 }
1074
1075 static unsigned long slb_pgsize_encoding(unsigned long psize)
1076 {
1077         unsigned long senc = 0;
1078
1079         if (psize > 0x1000) {
1080                 senc = SLB_VSID_L;
1081                 if (psize == 0x10000)
1082                         senc |= SLB_VSID_LP_01;
1083         }
1084         return senc;
1085 }
1086
1087 int kvmppc_core_prepare_memory_region(struct kvm *kvm,
1088                                 struct kvm_userspace_memory_region *mem)
1089 {
1090         unsigned long npages;
1091         unsigned long *phys;
1092
1093         /* Allocate a slot_phys array */
1094         npages = mem->memory_size >> PAGE_SHIFT;
1095         phys = kvm->arch.slot_phys[mem->slot];
1096         if (!phys) {
1097                 phys = vzalloc(npages * sizeof(unsigned long));
1098                 if (!phys)
1099                         return -ENOMEM;
1100                 kvm->arch.slot_phys[mem->slot] = phys;
1101                 kvm->arch.slot_npages[mem->slot] = npages;
1102         }
1103
1104         return 0;
1105 }
1106
1107 static void unpin_slot(struct kvm *kvm, int slot_id)
1108 {
1109         unsigned long *physp;
1110         unsigned long j, npages, pfn;
1111         struct page *page;
1112
1113         physp = kvm->arch.slot_phys[slot_id];
1114         npages = kvm->arch.slot_npages[slot_id];
1115         if (physp) {
1116                 spin_lock(&kvm->arch.slot_phys_lock);
1117                 for (j = 0; j < npages; j++) {
1118                         if (!(physp[j] & KVMPPC_GOT_PAGE))
1119                                 continue;
1120                         pfn = physp[j] >> PAGE_SHIFT;
1121                         page = pfn_to_page(pfn);
1122                         if (PageHuge(page))
1123                                 page = compound_head(page);
1124                         SetPageDirty(page);
1125                         put_page(page);
1126                 }
1127                 kvm->arch.slot_phys[slot_id] = NULL;
1128                 spin_unlock(&kvm->arch.slot_phys_lock);
1129                 vfree(physp);
1130         }
1131 }
1132
1133 void kvmppc_core_commit_memory_region(struct kvm *kvm,
1134                                 struct kvm_userspace_memory_region *mem)
1135 {
1136 }
1137
1138 static int kvmppc_hv_setup_rma(struct kvm_vcpu *vcpu)
1139 {
1140         int err = 0;
1141         struct kvm *kvm = vcpu->kvm;
1142         struct kvmppc_rma_info *ri = NULL;
1143         unsigned long hva;
1144         struct kvm_memory_slot *memslot;
1145         struct vm_area_struct *vma;
1146         unsigned long lpcr, senc;
1147         unsigned long psize, porder;
1148         unsigned long rma_size;
1149         unsigned long rmls;
1150         unsigned long *physp;
1151         unsigned long i, npages;
1152
1153         mutex_lock(&kvm->lock);
1154         if (kvm->arch.rma_setup_done)
1155                 goto out;       /* another vcpu beat us to it */
1156
1157         /* Look up the memslot for guest physical address 0 */
1158         memslot = gfn_to_memslot(kvm, 0);
1159
1160         /* We must have some memory at 0 by now */
1161         err = -EINVAL;
1162         if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID))
1163                 goto out;
1164
1165         /* Look up the VMA for the start of this memory slot */
1166         hva = memslot->userspace_addr;
1167         down_read(&current->mm->mmap_sem);
1168         vma = find_vma(current->mm, hva);
1169         if (!vma || vma->vm_start > hva || (vma->vm_flags & VM_IO))
1170                 goto up_out;
1171
1172         psize = vma_kernel_pagesize(vma);
1173         porder = __ilog2(psize);
1174
1175         /* Is this one of our preallocated RMAs? */
1176         if (vma->vm_file && vma->vm_file->f_op == &kvm_rma_fops &&
1177             hva == vma->vm_start)
1178                 ri = vma->vm_file->private_data;
1179
1180         up_read(&current->mm->mmap_sem);
1181
1182         if (!ri) {
1183                 /* On POWER7, use VRMA; on PPC970, give up */
1184                 err = -EPERM;
1185                 if (cpu_has_feature(CPU_FTR_ARCH_201)) {
1186                         pr_err("KVM: CPU requires an RMO\n");
1187                         goto out;
1188                 }
1189
1190                 /* We can handle 4k, 64k or 16M pages in the VRMA */
1191                 err = -EINVAL;
1192                 if (!(psize == 0x1000 || psize == 0x10000 ||
1193                       psize == 0x1000000))
1194                         goto out;
1195
1196                 /* Update VRMASD field in the LPCR */
1197                 senc = slb_pgsize_encoding(psize);
1198                 lpcr = kvm->arch.lpcr & ~LPCR_VRMASD;
1199                 lpcr |= senc << (LPCR_VRMASD_SH - 4);
1200                 kvm->arch.lpcr = lpcr;
1201
1202                 /* Create HPTEs in the hash page table for the VRMA */
1203                 kvmppc_map_vrma(vcpu, memslot, porder);
1204
1205         } else {
1206                 /* Set up to use an RMO region */
1207                 rma_size = ri->npages;
1208                 if (rma_size > memslot->npages)
1209                         rma_size = memslot->npages;
1210                 rma_size <<= PAGE_SHIFT;
1211                 rmls = lpcr_rmls(rma_size);
1212                 err = -EINVAL;
1213                 if (rmls < 0) {
1214                         pr_err("KVM: Can't use RMA of 0x%lx bytes\n", rma_size);
1215                         goto out;
1216                 }
1217                 atomic_inc(&ri->use_count);
1218                 kvm->arch.rma = ri;
1219
1220                 /* Update LPCR and RMOR */
1221                 lpcr = kvm->arch.lpcr;
1222                 if (cpu_has_feature(CPU_FTR_ARCH_201)) {
1223                         /* PPC970; insert RMLS value (split field) in HID4 */
1224                         lpcr &= ~((1ul << HID4_RMLS0_SH) |
1225                                   (3ul << HID4_RMLS2_SH));
1226                         lpcr |= ((rmls >> 2) << HID4_RMLS0_SH) |
1227                                 ((rmls & 3) << HID4_RMLS2_SH);
1228                         /* RMOR is also in HID4 */
1229                         lpcr |= ((ri->base_pfn >> (26 - PAGE_SHIFT)) & 0xffff)
1230                                 << HID4_RMOR_SH;
1231                 } else {
1232                         /* POWER7 */
1233                         lpcr &= ~(LPCR_VPM0 | LPCR_VRMA_L);
1234                         lpcr |= rmls << LPCR_RMLS_SH;
1235                         kvm->arch.rmor = kvm->arch.rma->base_pfn << PAGE_SHIFT;
1236                 }
1237                 kvm->arch.lpcr = lpcr;
1238                 pr_info("KVM: Using RMO at %lx size %lx (LPCR = %lx)\n",
1239                         ri->base_pfn << PAGE_SHIFT, rma_size, lpcr);
1240
1241                 /* Initialize phys addrs of pages in RMO */
1242                 npages = ri->npages;
1243                 porder = __ilog2(npages);
1244                 physp = kvm->arch.slot_phys[memslot->id];
1245                 spin_lock(&kvm->arch.slot_phys_lock);
1246                 for (i = 0; i < npages; ++i)
1247                         physp[i] = ((ri->base_pfn + i) << PAGE_SHIFT) + porder;
1248                 spin_unlock(&kvm->arch.slot_phys_lock);
1249         }
1250
1251         /* Order updates to kvm->arch.lpcr etc. vs. rma_setup_done */
1252         smp_wmb();
1253         kvm->arch.rma_setup_done = 1;
1254         err = 0;
1255  out:
1256         mutex_unlock(&kvm->lock);
1257         return err;
1258
1259  up_out:
1260         up_read(&current->mm->mmap_sem);
1261         goto out;
1262 }
1263
1264 int kvmppc_core_init_vm(struct kvm *kvm)
1265 {
1266         long r;
1267         unsigned long lpcr;
1268
1269         /* Allocate hashed page table */
1270         r = kvmppc_alloc_hpt(kvm);
1271         if (r)
1272                 return r;
1273
1274         INIT_LIST_HEAD(&kvm->arch.spapr_tce_tables);
1275
1276         kvm->arch.rma = NULL;
1277
1278         kvm->arch.host_sdr1 = mfspr(SPRN_SDR1);
1279
1280         if (cpu_has_feature(CPU_FTR_ARCH_201)) {
1281                 /* PPC970; HID4 is effectively the LPCR */
1282                 unsigned long lpid = kvm->arch.lpid;
1283                 kvm->arch.host_lpid = 0;
1284                 kvm->arch.host_lpcr = lpcr = mfspr(SPRN_HID4);
1285                 lpcr &= ~((3 << HID4_LPID1_SH) | (0xful << HID4_LPID5_SH));
1286                 lpcr |= ((lpid >> 4) << HID4_LPID1_SH) |
1287                         ((lpid & 0xf) << HID4_LPID5_SH);
1288         } else {
1289                 /* POWER7; init LPCR for virtual RMA mode */
1290                 kvm->arch.host_lpid = mfspr(SPRN_LPID);
1291                 kvm->arch.host_lpcr = lpcr = mfspr(SPRN_LPCR);
1292                 lpcr &= LPCR_PECE | LPCR_LPES;
1293                 lpcr |= (4UL << LPCR_DPFD_SH) | LPCR_HDICE |
1294                         LPCR_VPM0 | LPCR_VRMA_L;
1295         }
1296         kvm->arch.lpcr = lpcr;
1297
1298         spin_lock_init(&kvm->arch.slot_phys_lock);
1299         return 0;
1300 }
1301
1302 void kvmppc_core_destroy_vm(struct kvm *kvm)
1303 {
1304         unsigned long i;
1305
1306         for (i = 0; i < KVM_MEM_SLOTS_NUM; i++)
1307                 unpin_slot(kvm, i);
1308
1309         if (kvm->arch.rma) {
1310                 kvm_release_rma(kvm->arch.rma);
1311                 kvm->arch.rma = NULL;
1312         }
1313
1314         kvmppc_free_hpt(kvm);
1315         WARN_ON(!list_empty(&kvm->arch.spapr_tce_tables));
1316 }
1317
1318 /* These are stubs for now */
1319 void kvmppc_mmu_pte_pflush(struct kvm_vcpu *vcpu, ulong pa_start, ulong pa_end)
1320 {
1321 }
1322
1323 /* We don't need to emulate any privileged instructions or dcbz */
1324 int kvmppc_core_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu,
1325                            unsigned int inst, int *advance)
1326 {
1327         return EMULATE_FAIL;
1328 }
1329
1330 int kvmppc_core_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, int rs)
1331 {
1332         return EMULATE_FAIL;
1333 }
1334
1335 int kvmppc_core_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, int rt)
1336 {
1337         return EMULATE_FAIL;
1338 }
1339
1340 static int kvmppc_book3s_hv_init(void)
1341 {
1342         int r;
1343
1344         r = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
1345
1346         if (r)
1347                 return r;
1348
1349         r = kvmppc_mmu_hv_init();
1350
1351         return r;
1352 }
1353
1354 static void kvmppc_book3s_hv_exit(void)
1355 {
1356         kvm_exit();
1357 }
1358
1359 module_init(kvmppc_book3s_hv_init);
1360 module_exit(kvmppc_book3s_hv_exit);