~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/powerpc/kvm/book3s_pr.c

Version: ~ [ linux-5.4-rc1 ] ~ [ linux-5.3.2 ] ~ [ linux-5.2.18 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.76 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.146 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.194 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.194 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.74 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * Copyright (C) 2009. SUSE Linux Products GmbH. All rights reserved.
  3  *
  4  * Authors:
  5  *    Alexander Graf <agraf@suse.de>
  6  *    Kevin Wolf <mail@kevin-wolf.de>
  7  *    Paul Mackerras <paulus@samba.org>
  8  *
  9  * Description:
 10  * Functions relating to running KVM on Book 3S processors where
 11  * we don't have access to hypervisor mode, and we run the guest
 12  * in problem state (user mode).
 13  *
 14  * This file is derived from arch/powerpc/kvm/44x.c,
 15  * by Hollis Blanchard <hollisb@us.ibm.com>.
 16  *
 17  * This program is free software; you can redistribute it and/or modify
 18  * it under the terms of the GNU General Public License, version 2, as
 19  * published by the Free Software Foundation.
 20  */
 21 
 22 #include <linux/kvm_host.h>
 23 #include <linux/export.h>
 24 #include <linux/err.h>
 25 #include <linux/slab.h>
 26 
 27 #include <asm/reg.h>
 28 #include <asm/cputable.h>
 29 #include <asm/cacheflush.h>
 30 #include <asm/tlbflush.h>
 31 #include <linux/uaccess.h>
 32 #include <asm/io.h>
 33 #include <asm/kvm_ppc.h>
 34 #include <asm/kvm_book3s.h>
 35 #include <asm/mmu_context.h>
 36 #include <asm/switch_to.h>
 37 #include <asm/firmware.h>
 38 #include <asm/setup.h>
 39 #include <linux/gfp.h>
 40 #include <linux/sched.h>
 41 #include <linux/vmalloc.h>
 42 #include <linux/highmem.h>
 43 #include <linux/module.h>
 44 #include <linux/miscdevice.h>
 45 
 46 #include "book3s.h"
 47 
 48 #define CREATE_TRACE_POINTS
 49 #include "trace_pr.h"
 50 
 51 /* #define EXIT_DEBUG */
 52 /* #define DEBUG_EXT */
 53 
 54 static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr,
 55                              ulong msr);
 56 static void kvmppc_giveup_fac(struct kvm_vcpu *vcpu, ulong fac);
 57 
 58 /* Some compatibility defines */
 59 #ifdef CONFIG_PPC_BOOK3S_32
 60 #define MSR_USER32 MSR_USER
 61 #define MSR_USER64 MSR_USER
 62 #define HW_PAGE_SIZE PAGE_SIZE
 63 #endif
 64 
 65 static bool kvmppc_is_split_real(struct kvm_vcpu *vcpu)
 66 {
 67         ulong msr = kvmppc_get_msr(vcpu);
 68         return (msr & (MSR_IR|MSR_DR)) == MSR_DR;
 69 }
 70 
 71 static void kvmppc_fixup_split_real(struct kvm_vcpu *vcpu)
 72 {
 73         ulong msr = kvmppc_get_msr(vcpu);
 74         ulong pc = kvmppc_get_pc(vcpu);
 75 
 76         /* We are in DR only split real mode */
 77         if ((msr & (MSR_IR|MSR_DR)) != MSR_DR)
 78                 return;
 79 
 80         /* We have not fixed up the guest already */
 81         if (vcpu->arch.hflags & BOOK3S_HFLAG_SPLIT_HACK)
 82                 return;
 83 
 84         /* The code is in fixupable address space */
 85         if (pc & SPLIT_HACK_MASK)
 86                 return;
 87 
 88         vcpu->arch.hflags |= BOOK3S_HFLAG_SPLIT_HACK;
 89         kvmppc_set_pc(vcpu, pc | SPLIT_HACK_OFFS);
 90 }
 91 
 92 void kvmppc_unfixup_split_real(struct kvm_vcpu *vcpu);
 93 
 94 static void kvmppc_core_vcpu_load_pr(struct kvm_vcpu *vcpu, int cpu)
 95 {
 96 #ifdef CONFIG_PPC_BOOK3S_64
 97         struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
 98         memcpy(svcpu->slb, to_book3s(vcpu)->slb_shadow, sizeof(svcpu->slb));
 99         svcpu->slb_max = to_book3s(vcpu)->slb_shadow_max;
100         svcpu->in_use = 0;
101         svcpu_put(svcpu);
102 #endif
103 
104         /* Disable AIL if supported */
105         if (cpu_has_feature(CPU_FTR_HVMODE) &&
106             cpu_has_feature(CPU_FTR_ARCH_207S))
107                 mtspr(SPRN_LPCR, mfspr(SPRN_LPCR) & ~LPCR_AIL);
108 
109         vcpu->cpu = smp_processor_id();
110 #ifdef CONFIG_PPC_BOOK3S_32
111         current->thread.kvm_shadow_vcpu = vcpu->arch.shadow_vcpu;
112 #endif
113 
114         if (kvmppc_is_split_real(vcpu))
115                 kvmppc_fixup_split_real(vcpu);
116 }
117 
118 static void kvmppc_core_vcpu_put_pr(struct kvm_vcpu *vcpu)
119 {
120 #ifdef CONFIG_PPC_BOOK3S_64
121         struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
122         if (svcpu->in_use) {
123                 kvmppc_copy_from_svcpu(vcpu, svcpu);
124         }
125         memcpy(to_book3s(vcpu)->slb_shadow, svcpu->slb, sizeof(svcpu->slb));
126         to_book3s(vcpu)->slb_shadow_max = svcpu->slb_max;
127         svcpu_put(svcpu);
128 #endif
129 
130         if (kvmppc_is_split_real(vcpu))
131                 kvmppc_unfixup_split_real(vcpu);
132 
133         kvmppc_giveup_ext(vcpu, MSR_FP | MSR_VEC | MSR_VSX);
134         kvmppc_giveup_fac(vcpu, FSCR_TAR_LG);
135 
136         /* Enable AIL if supported */
137         if (cpu_has_feature(CPU_FTR_HVMODE) &&
138             cpu_has_feature(CPU_FTR_ARCH_207S))
139                 mtspr(SPRN_LPCR, mfspr(SPRN_LPCR) | LPCR_AIL_3);
140 
141         vcpu->cpu = -1;
142 }
143 
144 /* Copy data needed by real-mode code from vcpu to shadow vcpu */
145 void kvmppc_copy_to_svcpu(struct kvmppc_book3s_shadow_vcpu *svcpu,
146                           struct kvm_vcpu *vcpu)
147 {
148         svcpu->gpr[0] = vcpu->arch.gpr[0];
149         svcpu->gpr[1] = vcpu->arch.gpr[1];
150         svcpu->gpr[2] = vcpu->arch.gpr[2];
151         svcpu->gpr[3] = vcpu->arch.gpr[3];
152         svcpu->gpr[4] = vcpu->arch.gpr[4];
153         svcpu->gpr[5] = vcpu->arch.gpr[5];
154         svcpu->gpr[6] = vcpu->arch.gpr[6];
155         svcpu->gpr[7] = vcpu->arch.gpr[7];
156         svcpu->gpr[8] = vcpu->arch.gpr[8];
157         svcpu->gpr[9] = vcpu->arch.gpr[9];
158         svcpu->gpr[10] = vcpu->arch.gpr[10];
159         svcpu->gpr[11] = vcpu->arch.gpr[11];
160         svcpu->gpr[12] = vcpu->arch.gpr[12];
161         svcpu->gpr[13] = vcpu->arch.gpr[13];
162         svcpu->cr  = vcpu->arch.cr;
163         svcpu->xer = vcpu->arch.xer;
164         svcpu->ctr = vcpu->arch.ctr;
165         svcpu->lr  = vcpu->arch.lr;
166         svcpu->pc  = vcpu->arch.pc;
167 #ifdef CONFIG_PPC_BOOK3S_64
168         svcpu->shadow_fscr = vcpu->arch.shadow_fscr;
169 #endif
170         /*
171          * Now also save the current time base value. We use this
172          * to find the guest purr and spurr value.
173          */
174         vcpu->arch.entry_tb = get_tb();
175         vcpu->arch.entry_vtb = get_vtb();
176         if (cpu_has_feature(CPU_FTR_ARCH_207S))
177                 vcpu->arch.entry_ic = mfspr(SPRN_IC);
178         svcpu->in_use = true;
179 }
180 
181 /* Copy data touched by real-mode code from shadow vcpu back to vcpu */
182 void kvmppc_copy_from_svcpu(struct kvm_vcpu *vcpu,
183                             struct kvmppc_book3s_shadow_vcpu *svcpu)
184 {
185         /*
186          * vcpu_put would just call us again because in_use hasn't
187          * been updated yet.
188          */
189         preempt_disable();
190 
191         /*
192          * Maybe we were already preempted and synced the svcpu from
193          * our preempt notifiers. Don't bother touching this svcpu then.
194          */
195         if (!svcpu->in_use)
196                 goto out;
197 
198         vcpu->arch.gpr[0] = svcpu->gpr[0];
199         vcpu->arch.gpr[1] = svcpu->gpr[1];
200         vcpu->arch.gpr[2] = svcpu->gpr[2];
201         vcpu->arch.gpr[3] = svcpu->gpr[3];
202         vcpu->arch.gpr[4] = svcpu->gpr[4];
203         vcpu->arch.gpr[5] = svcpu->gpr[5];
204         vcpu->arch.gpr[6] = svcpu->gpr[6];
205         vcpu->arch.gpr[7] = svcpu->gpr[7];
206         vcpu->arch.gpr[8] = svcpu->gpr[8];
207         vcpu->arch.gpr[9] = svcpu->gpr[9];
208         vcpu->arch.gpr[10] = svcpu->gpr[10];
209         vcpu->arch.gpr[11] = svcpu->gpr[11];
210         vcpu->arch.gpr[12] = svcpu->gpr[12];
211         vcpu->arch.gpr[13] = svcpu->gpr[13];
212         vcpu->arch.cr  = svcpu->cr;
213         vcpu->arch.xer = svcpu->xer;
214         vcpu->arch.ctr = svcpu->ctr;
215         vcpu->arch.lr  = svcpu->lr;
216         vcpu->arch.pc  = svcpu->pc;
217         vcpu->arch.shadow_srr1 = svcpu->shadow_srr1;
218         vcpu->arch.fault_dar   = svcpu->fault_dar;
219         vcpu->arch.fault_dsisr = svcpu->fault_dsisr;
220         vcpu->arch.last_inst   = svcpu->last_inst;
221 #ifdef CONFIG_PPC_BOOK3S_64
222         vcpu->arch.shadow_fscr = svcpu->shadow_fscr;
223 #endif
224         /*
225          * Update purr and spurr using time base on exit.
226          */
227         vcpu->arch.purr += get_tb() - vcpu->arch.entry_tb;
228         vcpu->arch.spurr += get_tb() - vcpu->arch.entry_tb;
229         to_book3s(vcpu)->vtb += get_vtb() - vcpu->arch.entry_vtb;
230         if (cpu_has_feature(CPU_FTR_ARCH_207S))
231                 vcpu->arch.ic += mfspr(SPRN_IC) - vcpu->arch.entry_ic;
232         svcpu->in_use = false;
233 
234 out:
235         preempt_enable();
236 }
237 
238 static int kvmppc_core_check_requests_pr(struct kvm_vcpu *vcpu)
239 {
240         int r = 1; /* Indicate we want to get back into the guest */
241 
242         /* We misuse TLB_FLUSH to indicate that we want to clear
243            all shadow cache entries */
244         if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu))
245                 kvmppc_mmu_pte_flush(vcpu, 0, 0);
246 
247         return r;
248 }
249 
250 /************* MMU Notifiers *************/
251 static void do_kvm_unmap_hva(struct kvm *kvm, unsigned long start,
252                              unsigned long end)
253 {
254         long i;
255         struct kvm_vcpu *vcpu;
256         struct kvm_memslots *slots;
257         struct kvm_memory_slot *memslot;
258 
259         slots = kvm_memslots(kvm);
260         kvm_for_each_memslot(memslot, slots) {
261                 unsigned long hva_start, hva_end;
262                 gfn_t gfn, gfn_end;
263 
264                 hva_start = max(start, memslot->userspace_addr);
265                 hva_end = min(end, memslot->userspace_addr +
266                                         (memslot->npages << PAGE_SHIFT));
267                 if (hva_start >= hva_end)
268                         continue;
269                 /*
270                  * {gfn(page) | page intersects with [hva_start, hva_end)} =
271                  * {gfn, gfn+1, ..., gfn_end-1}.
272                  */
273                 gfn = hva_to_gfn_memslot(hva_start, memslot);
274                 gfn_end = hva_to_gfn_memslot(hva_end + PAGE_SIZE - 1, memslot);
275                 kvm_for_each_vcpu(i, vcpu, kvm)
276                         kvmppc_mmu_pte_pflush(vcpu, gfn << PAGE_SHIFT,
277                                               gfn_end << PAGE_SHIFT);
278         }
279 }
280 
281 static int kvm_unmap_hva_pr(struct kvm *kvm, unsigned long hva)
282 {
283         trace_kvm_unmap_hva(hva);
284 
285         do_kvm_unmap_hva(kvm, hva, hva + PAGE_SIZE);
286 
287         return 0;
288 }
289 
290 static int kvm_unmap_hva_range_pr(struct kvm *kvm, unsigned long start,
291                                   unsigned long end)
292 {
293         do_kvm_unmap_hva(kvm, start, end);
294 
295         return 0;
296 }
297 
298 static int kvm_age_hva_pr(struct kvm *kvm, unsigned long start,
299                           unsigned long end)
300 {
301         /* XXX could be more clever ;) */
302         return 0;
303 }
304 
305 static int kvm_test_age_hva_pr(struct kvm *kvm, unsigned long hva)
306 {
307         /* XXX could be more clever ;) */
308         return 0;
309 }
310 
311 static void kvm_set_spte_hva_pr(struct kvm *kvm, unsigned long hva, pte_t pte)
312 {
313         /* The page will get remapped properly on its next fault */
314         do_kvm_unmap_hva(kvm, hva, hva + PAGE_SIZE);
315 }
316 
317 /*****************************************/
318 
319 static void kvmppc_recalc_shadow_msr(struct kvm_vcpu *vcpu)
320 {
321         ulong guest_msr = kvmppc_get_msr(vcpu);
322         ulong smsr = guest_msr;
323 
324         /* Guest MSR values */
325         smsr &= MSR_FE0 | MSR_FE1 | MSR_SF | MSR_SE | MSR_BE | MSR_LE;
326         /* Process MSR values */
327         smsr |= MSR_ME | MSR_RI | MSR_IR | MSR_DR | MSR_PR | MSR_EE;
328         /* External providers the guest reserved */
329         smsr |= (guest_msr & vcpu->arch.guest_owned_ext);
330         /* 64-bit Process MSR values */
331 #ifdef CONFIG_PPC_BOOK3S_64
332         smsr |= MSR_ISF | MSR_HV;
333 #endif
334         vcpu->arch.shadow_msr = smsr;
335 }
336 
337 static void kvmppc_set_msr_pr(struct kvm_vcpu *vcpu, u64 msr)
338 {
339         ulong old_msr = kvmppc_get_msr(vcpu);
340 
341 #ifdef EXIT_DEBUG
342         printk(KERN_INFO "KVM: Set MSR to 0x%llx\n", msr);
343 #endif
344 
345         msr &= to_book3s(vcpu)->msr_mask;
346         kvmppc_set_msr_fast(vcpu, msr);
347         kvmppc_recalc_shadow_msr(vcpu);
348 
349         if (msr & MSR_POW) {
350                 if (!vcpu->arch.pending_exceptions) {
351                         kvm_vcpu_block(vcpu);
352                         clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
353                         vcpu->stat.halt_wakeup++;
354 
355                         /* Unset POW bit after we woke up */
356                         msr &= ~MSR_POW;
357                         kvmppc_set_msr_fast(vcpu, msr);
358                 }
359         }
360 
361         if (kvmppc_is_split_real(vcpu))
362                 kvmppc_fixup_split_real(vcpu);
363         else
364                 kvmppc_unfixup_split_real(vcpu);
365 
366         if ((kvmppc_get_msr(vcpu) & (MSR_PR|MSR_IR|MSR_DR)) !=
367                    (old_msr & (MSR_PR|MSR_IR|MSR_DR))) {
368                 kvmppc_mmu_flush_segments(vcpu);
369                 kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));
370 
371                 /* Preload magic page segment when in kernel mode */
372                 if (!(msr & MSR_PR) && vcpu->arch.magic_page_pa) {
373                         struct kvm_vcpu_arch *a = &vcpu->arch;
374 
375                         if (msr & MSR_DR)
376                                 kvmppc_mmu_map_segment(vcpu, a->magic_page_ea);
377                         else
378                                 kvmppc_mmu_map_segment(vcpu, a->magic_page_pa);
379                 }
380         }
381 
382         /*
383          * When switching from 32 to 64-bit, we may have a stale 32-bit
384          * magic page around, we need to flush it. Typically 32-bit magic
385          * page will be instanciated when calling into RTAS. Note: We
386          * assume that such transition only happens while in kernel mode,
387          * ie, we never transition from user 32-bit to kernel 64-bit with
388          * a 32-bit magic page around.
389          */
390         if (vcpu->arch.magic_page_pa &&
391             !(old_msr & MSR_PR) && !(old_msr & MSR_SF) && (msr & MSR_SF)) {
392                 /* going from RTAS to normal kernel code */
393                 kvmppc_mmu_pte_flush(vcpu, (uint32_t)vcpu->arch.magic_page_pa,
394                                      ~0xFFFUL);
395         }
396 
397         /* Preload FPU if it's enabled */
398         if (kvmppc_get_msr(vcpu) & MSR_FP)
399                 kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP);
400 }
401 
402 void kvmppc_set_pvr_pr(struct kvm_vcpu *vcpu, u32 pvr)
403 {
404         u32 host_pvr;
405 
406         vcpu->arch.hflags &= ~BOOK3S_HFLAG_SLB;
407         vcpu->arch.pvr = pvr;
408 #ifdef CONFIG_PPC_BOOK3S_64
409         if ((pvr >= 0x330000) && (pvr < 0x70330000)) {
410                 kvmppc_mmu_book3s_64_init(vcpu);
411                 if (!to_book3s(vcpu)->hior_explicit)
412                         to_book3s(vcpu)->hior = 0xfff00000;
413                 to_book3s(vcpu)->msr_mask = 0xffffffffffffffffULL;
414                 vcpu->arch.cpu_type = KVM_CPU_3S_64;
415         } else
416 #endif
417         {
418                 kvmppc_mmu_book3s_32_init(vcpu);
419                 if (!to_book3s(vcpu)->hior_explicit)
420                         to_book3s(vcpu)->hior = 0;
421                 to_book3s(vcpu)->msr_mask = 0xffffffffULL;
422                 vcpu->arch.cpu_type = KVM_CPU_3S_32;
423         }
424 
425         kvmppc_sanity_check(vcpu);
426 
427         /* If we are in hypervisor level on 970, we can tell the CPU to
428          * treat DCBZ as 32 bytes store */
429         vcpu->arch.hflags &= ~BOOK3S_HFLAG_DCBZ32;
430         if (vcpu->arch.mmu.is_dcbz32(vcpu) && (mfmsr() & MSR_HV) &&
431             !strcmp(cur_cpu_spec->platform, "ppc970"))
432                 vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32;
433 
434         /* Cell performs badly if MSR_FEx are set. So let's hope nobody
435            really needs them in a VM on Cell and force disable them. */
436         if (!strcmp(cur_cpu_spec->platform, "ppc-cell-be"))
437                 to_book3s(vcpu)->msr_mask &= ~(MSR_FE0 | MSR_FE1);
438 
439         /*
440          * If they're asking for POWER6 or later, set the flag
441          * indicating that we can do multiple large page sizes
442          * and 1TB segments.
443          * Also set the flag that indicates that tlbie has the large
444          * page bit in the RB operand instead of the instruction.
445          */
446         switch (PVR_VER(pvr)) {
447         case PVR_POWER6:
448         case PVR_POWER7:
449         case PVR_POWER7p:
450         case PVR_POWER8:
451         case PVR_POWER8E:
452         case PVR_POWER8NVL:
453                 vcpu->arch.hflags |= BOOK3S_HFLAG_MULTI_PGSIZE |
454                         BOOK3S_HFLAG_NEW_TLBIE;
455                 break;
456         }
457 
458 #ifdef CONFIG_PPC_BOOK3S_32
459         /* 32 bit Book3S always has 32 byte dcbz */
460         vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32;
461 #endif
462 
463         /* On some CPUs we can execute paired single operations natively */
464         asm ( "mfpvr %0" : "=r"(host_pvr));
465         switch (host_pvr) {
466         case 0x00080200:        /* lonestar 2.0 */
467         case 0x00088202:        /* lonestar 2.2 */
468         case 0x70000100:        /* gekko 1.0 */
469         case 0x00080100:        /* gekko 2.0 */
470         case 0x00083203:        /* gekko 2.3a */
471         case 0x00083213:        /* gekko 2.3b */
472         case 0x00083204:        /* gekko 2.4 */
473         case 0x00083214:        /* gekko 2.4e (8SE) - retail HW2 */
474         case 0x00087200:        /* broadway */
475                 vcpu->arch.hflags |= BOOK3S_HFLAG_NATIVE_PS;
476                 /* Enable HID2.PSE - in case we need it later */
477                 mtspr(SPRN_HID2_GEKKO, mfspr(SPRN_HID2_GEKKO) | (1 << 29));
478         }
479 }
480 
481 /* Book3s_32 CPUs always have 32 bytes cache line size, which Linux assumes. To
482  * make Book3s_32 Linux work on Book3s_64, we have to make sure we trap dcbz to
483  * emulate 32 bytes dcbz length.
484  *
485  * The Book3s_64 inventors also realized this case and implemented a special bit
486  * in the HID5 register, which is a hypervisor ressource. Thus we can't use it.
487  *
488  * My approach here is to patch the dcbz instruction on executing pages.
489  */
490 static void kvmppc_patch_dcbz(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte)
491 {
492         struct page *hpage;
493         u64 hpage_offset;
494         u32 *page;
495         int i;
496 
497         hpage = gfn_to_page(vcpu->kvm, pte->raddr >> PAGE_SHIFT);
498         if (is_error_page(hpage))
499                 return;
500 
501         hpage_offset = pte->raddr & ~PAGE_MASK;
502         hpage_offset &= ~0xFFFULL;
503         hpage_offset /= 4;
504 
505         get_page(hpage);
506         page = kmap_atomic(hpage);
507 
508         /* patch dcbz into reserved instruction, so we trap */
509         for (i=hpage_offset; i < hpage_offset + (HW_PAGE_SIZE / 4); i++)
510                 if ((be32_to_cpu(page[i]) & 0xff0007ff) == INS_DCBZ)
511                         page[i] &= cpu_to_be32(0xfffffff7);
512 
513         kunmap_atomic(page);
514         put_page(hpage);
515 }
516 
517 static bool kvmppc_visible_gpa(struct kvm_vcpu *vcpu, gpa_t gpa)
518 {
519         ulong mp_pa = vcpu->arch.magic_page_pa;
520 
521         if (!(kvmppc_get_msr(vcpu) & MSR_SF))
522                 mp_pa = (uint32_t)mp_pa;
523 
524         gpa &= ~0xFFFULL;
525         if (unlikely(mp_pa) && unlikely((mp_pa & KVM_PAM) == (gpa & KVM_PAM))) {
526                 return true;
527         }
528 
529         return kvm_is_visible_gfn(vcpu->kvm, gpa >> PAGE_SHIFT);
530 }
531 
532 int kvmppc_handle_pagefault(struct kvm_run *run, struct kvm_vcpu *vcpu,
533                             ulong eaddr, int vec)
534 {
535         bool data = (vec == BOOK3S_INTERRUPT_DATA_STORAGE);
536         bool iswrite = false;
537         int r = RESUME_GUEST;
538         int relocated;
539         int page_found = 0;
540         struct kvmppc_pte pte;
541         bool is_mmio = false;
542         bool dr = (kvmppc_get_msr(vcpu) & MSR_DR) ? true : false;
543         bool ir = (kvmppc_get_msr(vcpu) & MSR_IR) ? true : false;
544         u64 vsid;
545 
546         relocated = data ? dr : ir;
547         if (data && (vcpu->arch.fault_dsisr & DSISR_ISSTORE))
548                 iswrite = true;
549 
550         /* Resolve real address if translation turned on */
551         if (relocated) {
552                 page_found = vcpu->arch.mmu.xlate(vcpu, eaddr, &pte, data, iswrite);
553         } else {
554                 pte.may_execute = true;
555                 pte.may_read = true;
556                 pte.may_write = true;
557                 pte.raddr = eaddr & KVM_PAM;
558                 pte.eaddr = eaddr;
559                 pte.vpage = eaddr >> 12;
560                 pte.page_size = MMU_PAGE_64K;
561         }
562 
563         switch (kvmppc_get_msr(vcpu) & (MSR_DR|MSR_IR)) {
564         case 0:
565                 pte.vpage |= ((u64)VSID_REAL << (SID_SHIFT - 12));
566                 break;
567         case MSR_DR:
568                 if (!data &&
569                     (vcpu->arch.hflags & BOOK3S_HFLAG_SPLIT_HACK) &&
570                     ((pte.raddr & SPLIT_HACK_MASK) == SPLIT_HACK_OFFS))
571                         pte.raddr &= ~SPLIT_HACK_MASK;
572                 /* fall through */
573         case MSR_IR:
574                 vcpu->arch.mmu.esid_to_vsid(vcpu, eaddr >> SID_SHIFT, &vsid);
575 
576                 if ((kvmppc_get_msr(vcpu) & (MSR_DR|MSR_IR)) == MSR_DR)
577                         pte.vpage |= ((u64)VSID_REAL_DR << (SID_SHIFT - 12));
578                 else
579                         pte.vpage |= ((u64)VSID_REAL_IR << (SID_SHIFT - 12));
580                 pte.vpage |= vsid;
581 
582                 if (vsid == -1)
583                         page_found = -EINVAL;
584                 break;
585         }
586 
587         if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
588            (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) {
589                 /*
590                  * If we do the dcbz hack, we have to NX on every execution,
591                  * so we can patch the executing code. This renders our guest
592                  * NX-less.
593                  */
594                 pte.may_execute = !data;
595         }
596 
597         if (page_found == -ENOENT) {
598                 /* Page not found in guest PTE entries */
599                 u64 ssrr1 = vcpu->arch.shadow_srr1;
600                 u64 msr = kvmppc_get_msr(vcpu);
601                 kvmppc_set_dar(vcpu, kvmppc_get_fault_dar(vcpu));
602                 kvmppc_set_dsisr(vcpu, vcpu->arch.fault_dsisr);
603                 kvmppc_set_msr_fast(vcpu, msr | (ssrr1 & 0xf8000000ULL));
604                 kvmppc_book3s_queue_irqprio(vcpu, vec);
605         } else if (page_found == -EPERM) {
606                 /* Storage protection */
607                 u32 dsisr = vcpu->arch.fault_dsisr;
608                 u64 ssrr1 = vcpu->arch.shadow_srr1;
609                 u64 msr = kvmppc_get_msr(vcpu);
610                 kvmppc_set_dar(vcpu, kvmppc_get_fault_dar(vcpu));
611                 dsisr = (dsisr & ~DSISR_NOHPTE) | DSISR_PROTFAULT;
612                 kvmppc_set_dsisr(vcpu, dsisr);
613                 kvmppc_set_msr_fast(vcpu, msr | (ssrr1 & 0xf8000000ULL));
614                 kvmppc_book3s_queue_irqprio(vcpu, vec);
615         } else if (page_found == -EINVAL) {
616                 /* Page not found in guest SLB */
617                 kvmppc_set_dar(vcpu, kvmppc_get_fault_dar(vcpu));
618                 kvmppc_book3s_queue_irqprio(vcpu, vec + 0x80);
619         } else if (!is_mmio &&
620                    kvmppc_visible_gpa(vcpu, pte.raddr)) {
621                 if (data && !(vcpu->arch.fault_dsisr & DSISR_NOHPTE)) {
622                         /*
623                          * There is already a host HPTE there, presumably
624                          * a read-only one for a page the guest thinks
625                          * is writable, so get rid of it first.
626                          */
627                         kvmppc_mmu_unmap_page(vcpu, &pte);
628                 }
629                 /* The guest's PTE is not mapped yet. Map on the host */
630                 kvmppc_mmu_map_page(vcpu, &pte, iswrite);
631                 if (data)
632                         vcpu->stat.sp_storage++;
633                 else if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
634                          (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32)))
635                         kvmppc_patch_dcbz(vcpu, &pte);
636         } else {
637                 /* MMIO */
638                 vcpu->stat.mmio_exits++;
639                 vcpu->arch.paddr_accessed = pte.raddr;
640                 vcpu->arch.vaddr_accessed = pte.eaddr;
641                 r = kvmppc_emulate_mmio(run, vcpu);
642                 if ( r == RESUME_HOST_NV )
643                         r = RESUME_HOST;
644         }
645 
646         return r;
647 }
648 
649 /* Give up external provider (FPU, Altivec, VSX) */
650 void kvmppc_giveup_ext(struct kvm_vcpu *vcpu, ulong msr)
651 {
652         struct thread_struct *t = &current->thread;
653 
654         /*
655          * VSX instructions can access FP and vector registers, so if
656          * we are giving up VSX, make sure we give up FP and VMX as well.
657          */
658         if (msr & MSR_VSX)
659                 msr |= MSR_FP | MSR_VEC;
660 
661         msr &= vcpu->arch.guest_owned_ext;
662         if (!msr)
663                 return;
664 
665 #ifdef DEBUG_EXT
666         printk(KERN_INFO "Giving up ext 0x%lx\n", msr);
667 #endif
668 
669         if (msr & MSR_FP) {
670                 /*
671                  * Note that on CPUs with VSX, giveup_fpu stores
672                  * both the traditional FP registers and the added VSX
673                  * registers into thread.fp_state.fpr[].
674                  */
675                 if (t->regs->msr & MSR_FP)
676                         giveup_fpu(current);
677                 t->fp_save_area = NULL;
678         }
679 
680 #ifdef CONFIG_ALTIVEC
681         if (msr & MSR_VEC) {
682                 if (current->thread.regs->msr & MSR_VEC)
683                         giveup_altivec(current);
684                 t->vr_save_area = NULL;
685         }
686 #endif
687 
688         vcpu->arch.guest_owned_ext &= ~(msr | MSR_VSX);
689         kvmppc_recalc_shadow_msr(vcpu);
690 }
691 
692 /* Give up facility (TAR / EBB / DSCR) */
693 static void kvmppc_giveup_fac(struct kvm_vcpu *vcpu, ulong fac)
694 {
695 #ifdef CONFIG_PPC_BOOK3S_64
696         if (!(vcpu->arch.shadow_fscr & (1ULL << fac))) {
697                 /* Facility not available to the guest, ignore giveup request*/
698                 return;
699         }
700 
701         switch (fac) {
702         case FSCR_TAR_LG:
703                 vcpu->arch.tar = mfspr(SPRN_TAR);
704                 mtspr(SPRN_TAR, current->thread.tar);
705                 vcpu->arch.shadow_fscr &= ~FSCR_TAR;
706                 break;
707         }
708 #endif
709 }
710 
711 /* Handle external providers (FPU, Altivec, VSX) */
712 static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr,
713                              ulong msr)
714 {
715         struct thread_struct *t = &current->thread;
716 
717         /* When we have paired singles, we emulate in software */
718         if (vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE)
719                 return RESUME_GUEST;
720 
721         if (!(kvmppc_get_msr(vcpu) & msr)) {
722                 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
723                 return RESUME_GUEST;
724         }
725 
726         if (msr == MSR_VSX) {
727                 /* No VSX?  Give an illegal instruction interrupt */
728 #ifdef CONFIG_VSX
729                 if (!cpu_has_feature(CPU_FTR_VSX))
730 #endif
731                 {
732                         kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
733                         return RESUME_GUEST;
734                 }
735 
736                 /*
737                  * We have to load up all the FP and VMX registers before
738                  * we can let the guest use VSX instructions.
739                  */
740                 msr = MSR_FP | MSR_VEC | MSR_VSX;
741         }
742 
743         /* See if we already own all the ext(s) needed */
744         msr &= ~vcpu->arch.guest_owned_ext;
745         if (!msr)
746                 return RESUME_GUEST;
747 
748 #ifdef DEBUG_EXT
749         printk(KERN_INFO "Loading up ext 0x%lx\n", msr);
750 #endif
751 
752         if (msr & MSR_FP) {
753                 preempt_disable();
754                 enable_kernel_fp();
755                 load_fp_state(&vcpu->arch.fp);
756                 disable_kernel_fp();
757                 t->fp_save_area = &vcpu->arch.fp;
758                 preempt_enable();
759         }
760 
761         if (msr & MSR_VEC) {
762 #ifdef CONFIG_ALTIVEC
763                 preempt_disable();
764                 enable_kernel_altivec();
765                 load_vr_state(&vcpu->arch.vr);
766                 disable_kernel_altivec();
767                 t->vr_save_area = &vcpu->arch.vr;
768                 preempt_enable();
769 #endif
770         }
771 
772         t->regs->msr |= msr;
773         vcpu->arch.guest_owned_ext |= msr;
774         kvmppc_recalc_shadow_msr(vcpu);
775 
776         return RESUME_GUEST;
777 }
778 
779 /*
780  * Kernel code using FP or VMX could have flushed guest state to
781  * the thread_struct; if so, get it back now.
782  */
783 static void kvmppc_handle_lost_ext(struct kvm_vcpu *vcpu)
784 {
785         unsigned long lost_ext;
786 
787         lost_ext = vcpu->arch.guest_owned_ext & ~current->thread.regs->msr;
788         if (!lost_ext)
789                 return;
790 
791         if (lost_ext & MSR_FP) {
792                 preempt_disable();
793                 enable_kernel_fp();
794                 load_fp_state(&vcpu->arch.fp);
795                 disable_kernel_fp();
796                 preempt_enable();
797         }
798 #ifdef CONFIG_ALTIVEC
799         if (lost_ext & MSR_VEC) {
800                 preempt_disable();
801                 enable_kernel_altivec();
802                 load_vr_state(&vcpu->arch.vr);
803                 disable_kernel_altivec();
804                 preempt_enable();
805         }
806 #endif
807         current->thread.regs->msr |= lost_ext;
808 }
809 
810 #ifdef CONFIG_PPC_BOOK3S_64
811 
812 static void kvmppc_trigger_fac_interrupt(struct kvm_vcpu *vcpu, ulong fac)
813 {
814         /* Inject the Interrupt Cause field and trigger a guest interrupt */
815         vcpu->arch.fscr &= ~(0xffULL << 56);
816         vcpu->arch.fscr |= (fac << 56);
817         kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_FAC_UNAVAIL);
818 }
819 
820 static void kvmppc_emulate_fac(struct kvm_vcpu *vcpu, ulong fac)
821 {
822         enum emulation_result er = EMULATE_FAIL;
823 
824         if (!(kvmppc_get_msr(vcpu) & MSR_PR))
825                 er = kvmppc_emulate_instruction(vcpu->run, vcpu);
826 
827         if ((er != EMULATE_DONE) && (er != EMULATE_AGAIN)) {
828                 /* Couldn't emulate, trigger interrupt in guest */
829                 kvmppc_trigger_fac_interrupt(vcpu, fac);
830         }
831 }
832 
833 /* Enable facilities (TAR, EBB, DSCR) for the guest */
834 static int kvmppc_handle_fac(struct kvm_vcpu *vcpu, ulong fac)
835 {
836         bool guest_fac_enabled;
837         BUG_ON(!cpu_has_feature(CPU_FTR_ARCH_207S));
838 
839         /*
840          * Not every facility is enabled by FSCR bits, check whether the
841          * guest has this facility enabled at all.
842          */
843         switch (fac) {
844         case FSCR_TAR_LG:
845         case FSCR_EBB_LG:
846                 guest_fac_enabled = (vcpu->arch.fscr & (1ULL << fac));
847                 break;
848         case FSCR_TM_LG:
849                 guest_fac_enabled = kvmppc_get_msr(vcpu) & MSR_TM;
850                 break;
851         default:
852                 guest_fac_enabled = false;
853                 break;
854         }
855 
856         if (!guest_fac_enabled) {
857                 /* Facility not enabled by the guest */
858                 kvmppc_trigger_fac_interrupt(vcpu, fac);
859                 return RESUME_GUEST;
860         }
861 
862         switch (fac) {
863         case FSCR_TAR_LG:
864                 /* TAR switching isn't lazy in Linux yet */
865                 current->thread.tar = mfspr(SPRN_TAR);
866                 mtspr(SPRN_TAR, vcpu->arch.tar);
867                 vcpu->arch.shadow_fscr |= FSCR_TAR;
868                 break;
869         default:
870                 kvmppc_emulate_fac(vcpu, fac);
871                 break;
872         }
873 
874         return RESUME_GUEST;
875 }
876 
877 void kvmppc_set_fscr(struct kvm_vcpu *vcpu, u64 fscr)
878 {
879         if ((vcpu->arch.fscr & FSCR_TAR) && !(fscr & FSCR_TAR)) {
880                 /* TAR got dropped, drop it in shadow too */
881                 kvmppc_giveup_fac(vcpu, FSCR_TAR_LG);
882         }
883         vcpu->arch.fscr = fscr;
884 }
885 #endif
886 
887 static void kvmppc_setup_debug(struct kvm_vcpu *vcpu)
888 {
889         if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) {
890                 u64 msr = kvmppc_get_msr(vcpu);
891 
892                 kvmppc_set_msr(vcpu, msr | MSR_SE);
893         }
894 }
895 
896 static void kvmppc_clear_debug(struct kvm_vcpu *vcpu)
897 {
898         if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) {
899                 u64 msr = kvmppc_get_msr(vcpu);
900 
901                 kvmppc_set_msr(vcpu, msr & ~MSR_SE);
902         }
903 }
904 
905 static int kvmppc_exit_pr_progint(struct kvm_run *run, struct kvm_vcpu *vcpu,
906                                   unsigned int exit_nr)
907 {
908         enum emulation_result er;
909         ulong flags;
910         u32 last_inst;
911         int emul, r;
912 
913         /*
914          * shadow_srr1 only contains valid flags if we came here via a program
915          * exception. The other exceptions (emulation assist, FP unavailable,
916          * etc.) do not provide flags in SRR1, so use an illegal-instruction
917          * exception when injecting a program interrupt into the guest.
918          */
919         if (exit_nr == BOOK3S_INTERRUPT_PROGRAM)
920                 flags = vcpu->arch.shadow_srr1 & 0x1f0000ull;
921         else
922                 flags = SRR1_PROGILL;
923 
924         emul = kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst);
925         if (emul != EMULATE_DONE)
926                 return RESUME_GUEST;
927 
928         if (kvmppc_get_msr(vcpu) & MSR_PR) {
929 #ifdef EXIT_DEBUG
930                 pr_info("Userspace triggered 0x700 exception at\n 0x%lx (0x%x)\n",
931                         kvmppc_get_pc(vcpu), last_inst);
932 #endif
933                 if ((last_inst & 0xff0007ff) != (INS_DCBZ & 0xfffffff7)) {
934                         kvmppc_core_queue_program(vcpu, flags);
935                         return RESUME_GUEST;
936                 }
937         }
938 
939         vcpu->stat.emulated_inst_exits++;
940         er = kvmppc_emulate_instruction(run, vcpu);
941         switch (er) {
942         case EMULATE_DONE:
943                 r = RESUME_GUEST_NV;
944                 break;
945         case EMULATE_AGAIN:
946                 r = RESUME_GUEST;
947                 break;
948         case EMULATE_FAIL:
949                 pr_crit("%s: emulation at %lx failed (%08x)\n",
950                         __func__, kvmppc_get_pc(vcpu), last_inst);
951                 kvmppc_core_queue_program(vcpu, flags);
952                 r = RESUME_GUEST;
953                 break;
954         case EMULATE_DO_MMIO:
955                 run->exit_reason = KVM_EXIT_MMIO;
956                 r = RESUME_HOST_NV;
957                 break;
958         case EMULATE_EXIT_USER:
959                 r = RESUME_HOST_NV;
960                 break;
961         default:
962                 BUG();
963         }
964 
965         return r;
966 }
967 
968 int kvmppc_handle_exit_pr(struct kvm_run *run, struct kvm_vcpu *vcpu,
969                           unsigned int exit_nr)
970 {
971         int r = RESUME_HOST;
972         int s;
973 
974         vcpu->stat.sum_exits++;
975 
976         run->exit_reason = KVM_EXIT_UNKNOWN;
977         run->ready_for_interrupt_injection = 1;
978 
979         /* We get here with MSR.EE=1 */
980 
981         trace_kvm_exit(exit_nr, vcpu);
982         guest_exit();
983 
984         switch (exit_nr) {
985         case BOOK3S_INTERRUPT_INST_STORAGE:
986         {
987                 ulong shadow_srr1 = vcpu->arch.shadow_srr1;
988                 vcpu->stat.pf_instruc++;
989 
990                 if (kvmppc_is_split_real(vcpu))
991                         kvmppc_fixup_split_real(vcpu);
992 
993 #ifdef CONFIG_PPC_BOOK3S_32
994                 /* We set segments as unused segments when invalidating them. So
995                  * treat the respective fault as segment fault. */
996                 {
997                         struct kvmppc_book3s_shadow_vcpu *svcpu;
998                         u32 sr;
999 
1000                         svcpu = svcpu_get(vcpu);
1001                         sr = svcpu->sr[kvmppc_get_pc(vcpu) >> SID_SHIFT];
1002                         svcpu_put(svcpu);
1003                         if (sr == SR_INVALID) {
1004                                 kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));
1005                                 r = RESUME_GUEST;
1006                                 break;
1007                         }
1008                 }
1009 #endif
1010 
1011                 /* only care about PTEG not found errors, but leave NX alone */
1012                 if (shadow_srr1 & 0x40000000) {
1013                         int idx = srcu_read_lock(&vcpu->kvm->srcu);
1014                         r = kvmppc_handle_pagefault(run, vcpu, kvmppc_get_pc(vcpu), exit_nr);
1015                         srcu_read_unlock(&vcpu->kvm->srcu, idx);
1016                         vcpu->stat.sp_instruc++;
1017                 } else if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
1018                           (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) {
1019                         /*
1020                          * XXX If we do the dcbz hack we use the NX bit to flush&patch the page,
1021                          *     so we can't use the NX bit inside the guest. Let's cross our fingers,
1022                          *     that no guest that needs the dcbz hack does NX.
1023                          */
1024                         kvmppc_mmu_pte_flush(vcpu, kvmppc_get_pc(vcpu), ~0xFFFUL);
1025                         r = RESUME_GUEST;
1026                 } else {
1027                         u64 msr = kvmppc_get_msr(vcpu);
1028                         msr |= shadow_srr1 & 0x58000000;
1029                         kvmppc_set_msr_fast(vcpu, msr);
1030                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
1031                         r = RESUME_GUEST;
1032                 }
1033                 break;
1034         }
1035         case BOOK3S_INTERRUPT_DATA_STORAGE:
1036         {
1037                 ulong dar = kvmppc_get_fault_dar(vcpu);
1038                 u32 fault_dsisr = vcpu->arch.fault_dsisr;
1039                 vcpu->stat.pf_storage++;
1040 
1041 #ifdef CONFIG_PPC_BOOK3S_32
1042                 /* We set segments as unused segments when invalidating them. So
1043                  * treat the respective fault as segment fault. */
1044                 {
1045                         struct kvmppc_book3s_shadow_vcpu *svcpu;
1046                         u32 sr;
1047 
1048                         svcpu = svcpu_get(vcpu);
1049                         sr = svcpu->sr[dar >> SID_SHIFT];
1050                         svcpu_put(svcpu);
1051                         if (sr == SR_INVALID) {
1052                                 kvmppc_mmu_map_segment(vcpu, dar);
1053                                 r = RESUME_GUEST;
1054                                 break;
1055                         }
1056                 }
1057 #endif
1058 
1059                 /*
1060                  * We need to handle missing shadow PTEs, and
1061                  * protection faults due to us mapping a page read-only
1062                  * when the guest thinks it is writable.
1063                  */
1064                 if (fault_dsisr & (DSISR_NOHPTE | DSISR_PROTFAULT)) {
1065                         int idx = srcu_read_lock(&vcpu->kvm->srcu);
1066                         r = kvmppc_handle_pagefault(run, vcpu, dar, exit_nr);
1067                         srcu_read_unlock(&vcpu->kvm->srcu, idx);
1068                 } else {
1069                         kvmppc_set_dar(vcpu, dar);
1070                         kvmppc_set_dsisr(vcpu, fault_dsisr);
1071                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
1072                         r = RESUME_GUEST;
1073                 }
1074                 break;
1075         }
1076         case BOOK3S_INTERRUPT_DATA_SEGMENT:
1077                 if (kvmppc_mmu_map_segment(vcpu, kvmppc_get_fault_dar(vcpu)) < 0) {
1078                         kvmppc_set_dar(vcpu, kvmppc_get_fault_dar(vcpu));
1079                         kvmppc_book3s_queue_irqprio(vcpu,
1080                                 BOOK3S_INTERRUPT_DATA_SEGMENT);
1081                 }
1082                 r = RESUME_GUEST;
1083                 break;
1084         case BOOK3S_INTERRUPT_INST_SEGMENT:
1085                 if (kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu)) < 0) {
1086                         kvmppc_book3s_queue_irqprio(vcpu,
1087                                 BOOK3S_INTERRUPT_INST_SEGMENT);
1088                 }
1089                 r = RESUME_GUEST;
1090                 break;
1091         /* We're good on these - the host merely wanted to get our attention */
1092         case BOOK3S_INTERRUPT_DECREMENTER:
1093         case BOOK3S_INTERRUPT_HV_DECREMENTER:
1094         case BOOK3S_INTERRUPT_DOORBELL:
1095         case BOOK3S_INTERRUPT_H_DOORBELL:
1096                 vcpu->stat.dec_exits++;
1097                 r = RESUME_GUEST;
1098                 break;
1099         case BOOK3S_INTERRUPT_EXTERNAL:
1100         case BOOK3S_INTERRUPT_EXTERNAL_LEVEL:
1101         case BOOK3S_INTERRUPT_EXTERNAL_HV:
1102                 vcpu->stat.ext_intr_exits++;
1103                 r = RESUME_GUEST;
1104                 break;
1105         case BOOK3S_INTERRUPT_PERFMON:
1106                 r = RESUME_GUEST;
1107                 break;
1108         case BOOK3S_INTERRUPT_PROGRAM:
1109         case BOOK3S_INTERRUPT_H_EMUL_ASSIST:
1110                 r = kvmppc_exit_pr_progint(run, vcpu, exit_nr);
1111                 break;
1112         case BOOK3S_INTERRUPT_SYSCALL:
1113         {
1114                 u32 last_sc;
1115                 int emul;
1116 
1117                 /* Get last sc for papr */
1118                 if (vcpu->arch.papr_enabled) {
1119                         /* The sc instuction points SRR0 to the next inst */
1120                         emul = kvmppc_get_last_inst(vcpu, INST_SC, &last_sc);
1121                         if (emul != EMULATE_DONE) {
1122                                 kvmppc_set_pc(vcpu, kvmppc_get_pc(vcpu) - 4);
1123                                 r = RESUME_GUEST;
1124                                 break;
1125                         }
1126                 }
1127 
1128                 if (vcpu->arch.papr_enabled &&
1129                     (last_sc == 0x44000022) &&
1130                     !(kvmppc_get_msr(vcpu) & MSR_PR)) {
1131                         /* SC 1 papr hypercalls */
1132                         ulong cmd = kvmppc_get_gpr(vcpu, 3);
1133                         int i;
1134 
1135 #ifdef CONFIG_PPC_BOOK3S_64
1136                         if (kvmppc_h_pr(vcpu, cmd) == EMULATE_DONE) {
1137                                 r = RESUME_GUEST;
1138                                 break;
1139                         }
1140 #endif
1141 
1142                         run->papr_hcall.nr = cmd;
1143                         for (i = 0; i < 9; ++i) {
1144                                 ulong gpr = kvmppc_get_gpr(vcpu, 4 + i);
1145                                 run->papr_hcall.args[i] = gpr;
1146                         }
1147                         run->exit_reason = KVM_EXIT_PAPR_HCALL;
1148                         vcpu->arch.hcall_needed = 1;
1149                         r = RESUME_HOST;
1150                 } else if (vcpu->arch.osi_enabled &&
1151                     (((u32)kvmppc_get_gpr(vcpu, 3)) == OSI_SC_MAGIC_R3) &&
1152                     (((u32)kvmppc_get_gpr(vcpu, 4)) == OSI_SC_MAGIC_R4)) {
1153                         /* MOL hypercalls */
1154                         u64 *gprs = run->osi.gprs;
1155                         int i;
1156 
1157                         run->exit_reason = KVM_EXIT_OSI;
1158                         for (i = 0; i < 32; i++)
1159                                 gprs[i] = kvmppc_get_gpr(vcpu, i);
1160                         vcpu->arch.osi_needed = 1;
1161                         r = RESUME_HOST_NV;
1162                 } else if (!(kvmppc_get_msr(vcpu) & MSR_PR) &&
1163                     (((u32)kvmppc_get_gpr(vcpu, 0)) == KVM_SC_MAGIC_R0)) {
1164                         /* KVM PV hypercalls */
1165                         kvmppc_set_gpr(vcpu, 3, kvmppc_kvm_pv(vcpu));
1166                         r = RESUME_GUEST;
1167                 } else {
1168                         /* Guest syscalls */
1169                         vcpu->stat.syscall_exits++;
1170                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
1171                         r = RESUME_GUEST;
1172                 }
1173                 break;
1174         }
1175         case BOOK3S_INTERRUPT_FP_UNAVAIL:
1176         case BOOK3S_INTERRUPT_ALTIVEC:
1177         case BOOK3S_INTERRUPT_VSX:
1178         {
1179                 int ext_msr = 0;
1180                 int emul;
1181                 u32 last_inst;
1182 
1183                 if (vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE) {
1184                         /* Do paired single instruction emulation */
1185                         emul = kvmppc_get_last_inst(vcpu, INST_GENERIC,
1186                                                     &last_inst);
1187                         if (emul == EMULATE_DONE)
1188                                 r = kvmppc_exit_pr_progint(run, vcpu, exit_nr);
1189                         else
1190                                 r = RESUME_GUEST;
1191 
1192                         break;
1193                 }
1194 
1195                 /* Enable external provider */
1196                 switch (exit_nr) {
1197                 case BOOK3S_INTERRUPT_FP_UNAVAIL:
1198                         ext_msr = MSR_FP;
1199                         break;
1200 
1201                 case BOOK3S_INTERRUPT_ALTIVEC:
1202                         ext_msr = MSR_VEC;
1203                         break;
1204 
1205                 case BOOK3S_INTERRUPT_VSX:
1206                         ext_msr = MSR_VSX;
1207                         break;
1208                 }
1209 
1210                 r = kvmppc_handle_ext(vcpu, exit_nr, ext_msr);
1211                 break;
1212         }
1213         case BOOK3S_INTERRUPT_ALIGNMENT:
1214         {
1215                 u32 last_inst;
1216                 int emul = kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst);
1217 
1218                 if (emul == EMULATE_DONE) {
1219                         u32 dsisr;
1220                         u64 dar;
1221 
1222                         dsisr = kvmppc_alignment_dsisr(vcpu, last_inst);
1223                         dar = kvmppc_alignment_dar(vcpu, last_inst);
1224 
1225                         kvmppc_set_dsisr(vcpu, dsisr);
1226                         kvmppc_set_dar(vcpu, dar);
1227 
1228                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
1229                 }
1230                 r = RESUME_GUEST;
1231                 break;
1232         }
1233 #ifdef CONFIG_PPC_BOOK3S_64
1234         case BOOK3S_INTERRUPT_FAC_UNAVAIL:
1235                 kvmppc_handle_fac(vcpu, vcpu->arch.shadow_fscr >> 56);
1236                 r = RESUME_GUEST;
1237                 break;
1238 #endif
1239         case BOOK3S_INTERRUPT_MACHINE_CHECK:
1240                 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
1241                 r = RESUME_GUEST;
1242                 break;
1243         case BOOK3S_INTERRUPT_TRACE:
1244                 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) {
1245                         run->exit_reason = KVM_EXIT_DEBUG;
1246                         r = RESUME_HOST;
1247                 } else {
1248                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
1249                         r = RESUME_GUEST;
1250                 }
1251                 break;
1252         default:
1253         {
1254                 ulong shadow_srr1 = vcpu->arch.shadow_srr1;
1255                 /* Ugh - bork here! What did we get? */
1256                 printk(KERN_EMERG "exit_nr=0x%x | pc=0x%lx | msr=0x%lx\n",
1257                         exit_nr, kvmppc_get_pc(vcpu), shadow_srr1);
1258                 r = RESUME_HOST;
1259                 BUG();
1260                 break;
1261         }
1262         }
1263 
1264         if (!(r & RESUME_HOST)) {
1265                 /* To avoid clobbering exit_reason, only check for signals if
1266                  * we aren't already exiting to userspace for some other
1267                  * reason. */
1268 
1269                 /*
1270                  * Interrupts could be timers for the guest which we have to
1271                  * inject again, so let's postpone them until we're in the guest
1272                  * and if we really did time things so badly, then we just exit
1273                  * again due to a host external interrupt.
1274                  */
1275                 s = kvmppc_prepare_to_enter(vcpu);
1276                 if (s <= 0)
1277                         r = s;
1278                 else {
1279                         /* interrupts now hard-disabled */
1280                         kvmppc_fix_ee_before_entry();
1281                 }
1282 
1283                 kvmppc_handle_lost_ext(vcpu);
1284         }
1285 
1286         trace_kvm_book3s_reenter(r, vcpu);
1287 
1288         return r;
1289 }
1290 
1291 static int kvm_arch_vcpu_ioctl_get_sregs_pr(struct kvm_vcpu *vcpu,
1292                                             struct kvm_sregs *sregs)
1293 {
1294         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
1295         int i;
1296 
1297         sregs->pvr = vcpu->arch.pvr;
1298 
1299         sregs->u.s.sdr1 = to_book3s(vcpu)->sdr1;
1300         if (vcpu->arch.hflags & BOOK3S_HFLAG_SLB) {
1301                 for (i = 0; i < 64; i++) {
1302                         sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige | i;
1303                         sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv;
1304                 }
1305         } else {
1306                 for (i = 0; i < 16; i++)
1307                         sregs->u.s.ppc32.sr[i] = kvmppc_get_sr(vcpu, i);
1308 
1309                 for (i = 0; i < 8; i++) {
1310                         sregs->u.s.ppc32.ibat[i] = vcpu3s->ibat[i].raw;
1311                         sregs->u.s.ppc32.dbat[i] = vcpu3s->dbat[i].raw;
1312                 }
1313         }
1314 
1315         return 0;
1316 }
1317 
1318 static int kvm_arch_vcpu_ioctl_set_sregs_pr(struct kvm_vcpu *vcpu,
1319                                             struct kvm_sregs *sregs)
1320 {
1321         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
1322         int i;
1323 
1324         kvmppc_set_pvr_pr(vcpu, sregs->pvr);
1325 
1326         vcpu3s->sdr1 = sregs->u.s.sdr1;
1327         if (vcpu->arch.hflags & BOOK3S_HFLAG_SLB) {
1328                 for (i = 0; i < 64; i++) {
1329                         vcpu->arch.mmu.slbmte(vcpu, sregs->u.s.ppc64.slb[i].slbv,
1330                                                     sregs->u.s.ppc64.slb[i].slbe);
1331                 }
1332         } else {
1333                 for (i = 0; i < 16; i++) {
1334                         vcpu->arch.mmu.mtsrin(vcpu, i, sregs->u.s.ppc32.sr[i]);
1335                 }
1336                 for (i = 0; i < 8; i++) {
1337                         kvmppc_set_bat(vcpu, &(vcpu3s->ibat[i]), false,
1338                                        (u32)sregs->u.s.ppc32.ibat[i]);
1339                         kvmppc_set_bat(vcpu, &(vcpu3s->ibat[i]), true,
1340                                        (u32)(sregs->u.s.ppc32.ibat[i] >> 32));
1341                         kvmppc_set_bat(vcpu, &(vcpu3s->dbat[i]), false,
1342                                        (u32)sregs->u.s.ppc32.dbat[i]);
1343                         kvmppc_set_bat(vcpu, &(vcpu3s->dbat[i]), true,
1344                                        (u32)(sregs->u.s.ppc32.dbat[i] >> 32));
1345                 }
1346         }
1347 
1348         /* Flush the MMU after messing with the segments */
1349         kvmppc_mmu_pte_flush(vcpu, 0, 0);
1350 
1351         return 0;
1352 }
1353 
1354 static int kvmppc_get_one_reg_pr(struct kvm_vcpu *vcpu, u64 id,
1355                                  union kvmppc_one_reg *val)
1356 {
1357         int r = 0;
1358 
1359         switch (id) {
1360         case KVM_REG_PPC_DEBUG_INST:
1361                 *val = get_reg_val(id, KVMPPC_INST_SW_BREAKPOINT);
1362                 break;
1363         case KVM_REG_PPC_HIOR:
1364                 *val = get_reg_val(id, to_book3s(vcpu)->hior);
1365                 break;
1366         case KVM_REG_PPC_VTB:
1367                 *val = get_reg_val(id, to_book3s(vcpu)->vtb);
1368                 break;
1369         case KVM_REG_PPC_LPCR:
1370         case KVM_REG_PPC_LPCR_64:
1371                 /*
1372                  * We are only interested in the LPCR_ILE bit
1373                  */
1374                 if (vcpu->arch.intr_msr & MSR_LE)
1375                         *val = get_reg_val(id, LPCR_ILE);
1376                 else
1377                         *val = get_reg_val(id, 0);
1378                 break;
1379         default:
1380                 r = -EINVAL;
1381                 break;
1382         }
1383 
1384         return r;
1385 }
1386 
1387 static void kvmppc_set_lpcr_pr(struct kvm_vcpu *vcpu, u64 new_lpcr)
1388 {
1389         if (new_lpcr & LPCR_ILE)
1390                 vcpu->arch.intr_msr |= MSR_LE;
1391         else
1392                 vcpu->arch.intr_msr &= ~MSR_LE;
1393 }
1394 
1395 static int kvmppc_set_one_reg_pr(struct kvm_vcpu *vcpu, u64 id,
1396                                  union kvmppc_one_reg *val)
1397 {
1398         int r = 0;
1399 
1400         switch (id) {
1401         case KVM_REG_PPC_HIOR:
1402                 to_book3s(vcpu)->hior = set_reg_val(id, *val);
1403                 to_book3s(vcpu)->hior_explicit = true;
1404                 break;
1405         case KVM_REG_PPC_VTB:
1406                 to_book3s(vcpu)->vtb = set_reg_val(id, *val);
1407                 break;
1408         case KVM_REG_PPC_LPCR:
1409         case KVM_REG_PPC_LPCR_64:
1410                 kvmppc_set_lpcr_pr(vcpu, set_reg_val(id, *val));
1411                 break;
1412         default:
1413                 r = -EINVAL;
1414                 break;
1415         }
1416 
1417         return r;
1418 }
1419 
1420 static struct kvm_vcpu *kvmppc_core_vcpu_create_pr(struct kvm *kvm,
1421                                                    unsigned int id)
1422 {
1423         struct kvmppc_vcpu_book3s *vcpu_book3s;
1424         struct kvm_vcpu *vcpu;
1425         int err = -ENOMEM;
1426         unsigned long p;
1427 
1428         vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
1429         if (!vcpu)
1430                 goto out;
1431 
1432         vcpu_book3s = vzalloc(sizeof(struct kvmppc_vcpu_book3s));
1433         if (!vcpu_book3s)
1434                 goto free_vcpu;
1435         vcpu->arch.book3s = vcpu_book3s;
1436 
1437 #ifdef CONFIG_KVM_BOOK3S_32_HANDLER
1438         vcpu->arch.shadow_vcpu =
1439                 kzalloc(sizeof(*vcpu->arch.shadow_vcpu), GFP_KERNEL);
1440         if (!vcpu->arch.shadow_vcpu)
1441                 goto free_vcpu3s;
1442 #endif
1443 
1444         err = kvm_vcpu_init(vcpu, kvm, id);
1445         if (err)
1446                 goto free_shadow_vcpu;
1447 
1448         err = -ENOMEM;
1449         p = __get_free_page(GFP_KERNEL|__GFP_ZERO);
1450         if (!p)
1451                 goto uninit_vcpu;
1452         vcpu->arch.shared = (void *)p;
1453 #ifdef CONFIG_PPC_BOOK3S_64
1454         /* Always start the shared struct in native endian mode */
1455 #ifdef __BIG_ENDIAN__
1456         vcpu->arch.shared_big_endian = true;
1457 #else
1458         vcpu->arch.shared_big_endian = false;
1459 #endif
1460 
1461         /*
1462          * Default to the same as the host if we're on sufficiently
1463          * recent machine that we have 1TB segments;
1464          * otherwise default to PPC970FX.
1465          */
1466         vcpu->arch.pvr = 0x3C0301;
1467         if (mmu_has_feature(MMU_FTR_1T_SEGMENT))
1468                 vcpu->arch.pvr = mfspr(SPRN_PVR);
1469         vcpu->arch.intr_msr = MSR_SF;
1470 #else
1471         /* default to book3s_32 (750) */
1472         vcpu->arch.pvr = 0x84202;
1473 #endif
1474         kvmppc_set_pvr_pr(vcpu, vcpu->arch.pvr);
1475         vcpu->arch.slb_nr = 64;
1476 
1477         vcpu->arch.shadow_msr = MSR_USER64 & ~MSR_LE;
1478 
1479         err = kvmppc_mmu_init(vcpu);
1480         if (err < 0)
1481                 goto uninit_vcpu;
1482 
1483         return vcpu;
1484 
1485 uninit_vcpu:
1486         kvm_vcpu_uninit(vcpu);
1487 free_shadow_vcpu:
1488 #ifdef CONFIG_KVM_BOOK3S_32_HANDLER
1489         kfree(vcpu->arch.shadow_vcpu);
1490 free_vcpu3s:
1491 #endif
1492         vfree(vcpu_book3s);
1493 free_vcpu:
1494         kmem_cache_free(kvm_vcpu_cache, vcpu);
1495 out:
1496         return ERR_PTR(err);
1497 }
1498 
1499 static void kvmppc_core_vcpu_free_pr(struct kvm_vcpu *vcpu)
1500 {
1501         struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
1502 
1503         free_page((unsigned long)vcpu->arch.shared & PAGE_MASK);
1504         kvm_vcpu_uninit(vcpu);
1505 #ifdef CONFIG_KVM_BOOK3S_32_HANDLER
1506         kfree(vcpu->arch.shadow_vcpu);
1507 #endif
1508         vfree(vcpu_book3s);
1509         kmem_cache_free(kvm_vcpu_cache, vcpu);
1510 }
1511 
1512 static int kvmppc_vcpu_run_pr(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
1513 {
1514         int ret;
1515 #ifdef CONFIG_ALTIVEC
1516         unsigned long uninitialized_var(vrsave);
1517 #endif
1518 
1519         /* Check if we can run the vcpu at all */
1520         if (!vcpu->arch.sane) {
1521                 kvm_run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1522                 ret = -EINVAL;
1523                 goto out;
1524         }
1525 
1526         kvmppc_setup_debug(vcpu);
1527 
1528         /*
1529          * Interrupts could be timers for the guest which we have to inject
1530          * again, so let's postpone them until we're in the guest and if we
1531          * really did time things so badly, then we just exit again due to
1532          * a host external interrupt.
1533          */
1534         ret = kvmppc_prepare_to_enter(vcpu);
1535         if (ret <= 0)
1536                 goto out;
1537         /* interrupts now hard-disabled */
1538 
1539         /* Save FPU, Altivec and VSX state */
1540         giveup_all(current);
1541 
1542         /* Preload FPU if it's enabled */
1543         if (kvmppc_get_msr(vcpu) & MSR_FP)
1544                 kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP);
1545 
1546         kvmppc_fix_ee_before_entry();
1547 
1548         ret = __kvmppc_vcpu_run(kvm_run, vcpu);
1549 
1550         kvmppc_clear_debug(vcpu);
1551 
1552         /* No need for guest_exit. It's done in handle_exit.
1553            We also get here with interrupts enabled. */
1554 
1555         /* Make sure we save the guest FPU/Altivec/VSX state */
1556         kvmppc_giveup_ext(vcpu, MSR_FP | MSR_VEC | MSR_VSX);
1557 
1558         /* Make sure we save the guest TAR/EBB/DSCR state */
1559         kvmppc_giveup_fac(vcpu, FSCR_TAR_LG);
1560 
1561 out:
1562         vcpu->mode = OUTSIDE_GUEST_MODE;
1563         return ret;
1564 }
1565 
1566 /*
1567  * Get (and clear) the dirty memory log for a memory slot.
1568  */
1569 static int kvm_vm_ioctl_get_dirty_log_pr(struct kvm *kvm,
1570                                          struct kvm_dirty_log *log)
1571 {
1572         struct kvm_memslots *slots;
1573         struct kvm_memory_slot *memslot;
1574         struct kvm_vcpu *vcpu;
1575         ulong ga, ga_end;
1576         int is_dirty = 0;
1577         int r;
1578         unsigned long n;
1579 
1580         mutex_lock(&kvm->slots_lock);
1581 
1582         r = kvm_get_dirty_log(kvm, log, &is_dirty);
1583         if (r)
1584                 goto out;
1585 
1586         /* If nothing is dirty, don't bother messing with page tables. */
1587         if (is_dirty) {
1588                 slots = kvm_memslots(kvm);
1589                 memslot = id_to_memslot(slots, log->slot);
1590 
1591                 ga = memslot->base_gfn << PAGE_SHIFT;
1592                 ga_end = ga + (memslot->npages << PAGE_SHIFT);
1593 
1594                 kvm_for_each_vcpu(n, vcpu, kvm)
1595                         kvmppc_mmu_pte_pflush(vcpu, ga, ga_end);
1596 
1597                 n = kvm_dirty_bitmap_bytes(memslot);
1598                 memset(memslot->dirty_bitmap, 0, n);
1599         }
1600 
1601         r = 0;
1602 out:
1603         mutex_unlock(&kvm->slots_lock);
1604         return r;
1605 }
1606 
1607 static void kvmppc_core_flush_memslot_pr(struct kvm *kvm,
1608                                          struct kvm_memory_slot *memslot)
1609 {
1610         return;
1611 }
1612 
1613 static int kvmppc_core_prepare_memory_region_pr(struct kvm *kvm,
1614                                         struct kvm_memory_slot *memslot,
1615                                         const struct kvm_userspace_memory_region *mem)
1616 {
1617         return 0;
1618 }
1619 
1620 static void kvmppc_core_commit_memory_region_pr(struct kvm *kvm,
1621                                 const struct kvm_userspace_memory_region *mem,
1622                                 const struct kvm_memory_slot *old,
1623                                 const struct kvm_memory_slot *new)
1624 {
1625         return;
1626 }
1627 
1628 static void kvmppc_core_free_memslot_pr(struct kvm_memory_slot *free,
1629                                         struct kvm_memory_slot *dont)
1630 {
1631         return;
1632 }
1633 
1634 static int kvmppc_core_create_memslot_pr(struct kvm_memory_slot *slot,
1635                                          unsigned long npages)
1636 {
1637         return 0;
1638 }
1639 
1640 
1641 #ifdef CONFIG_PPC64
1642 static int kvm_vm_ioctl_get_smmu_info_pr(struct kvm *kvm,
1643                                          struct kvm_ppc_smmu_info *info)
1644 {
1645         long int i;
1646         struct kvm_vcpu *vcpu;
1647 
1648         info->flags = 0;
1649 
1650         /* SLB is always 64 entries */
1651         info->slb_size = 64;
1652 
1653         /* Standard 4k base page size segment */
1654         info->sps[0].page_shift = 12;
1655         info->sps[0].slb_enc = 0;
1656         info->sps[0].enc[0].page_shift = 12;
1657         info->sps[0].enc[0].pte_enc = 0;
1658 
1659         /*
1660          * 64k large page size.
1661          * We only want to put this in if the CPUs we're emulating
1662          * support it, but unfortunately we don't have a vcpu easily
1663          * to hand here to test.  Just pick the first vcpu, and if
1664          * that doesn't exist yet, report the minimum capability,
1665          * i.e., no 64k pages.
1666          * 1T segment support goes along with 64k pages.
1667          */
1668         i = 1;
1669         vcpu = kvm_get_vcpu(kvm, 0);
1670         if (vcpu && (vcpu->arch.hflags & BOOK3S_HFLAG_MULTI_PGSIZE)) {
1671                 info->flags = KVM_PPC_1T_SEGMENTS;
1672                 info->sps[i].page_shift = 16;
1673                 info->sps[i].slb_enc = SLB_VSID_L | SLB_VSID_LP_01;
1674                 info->sps[i].enc[0].page_shift = 16;
1675                 info->sps[i].enc[0].pte_enc = 1;
1676                 ++i;
1677         }
1678 
1679         /* Standard 16M large page size segment */
1680         info->sps[i].page_shift = 24;
1681         info->sps[i].slb_enc = SLB_VSID_L;
1682         info->sps[i].enc[0].page_shift = 24;
1683         info->sps[i].enc[0].pte_enc = 0;
1684 
1685         return 0;
1686 }
1687 #else
1688 static int kvm_vm_ioctl_get_smmu_info_pr(struct kvm *kvm,
1689                                          struct kvm_ppc_smmu_info *info)
1690 {
1691         /* We should not get called */
1692         BUG();
1693 }
1694 #endif /* CONFIG_PPC64 */
1695 
1696 static unsigned int kvm_global_user_count = 0;
1697 static DEFINE_SPINLOCK(kvm_global_user_count_lock);
1698 
1699 static int kvmppc_core_init_vm_pr(struct kvm *kvm)
1700 {
1701         mutex_init(&kvm->arch.hpt_mutex);
1702 
1703 #ifdef CONFIG_PPC_BOOK3S_64
1704         /* Start out with the default set of hcalls enabled */
1705         kvmppc_pr_init_default_hcalls(kvm);
1706 #endif
1707 
1708         if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
1709                 spin_lock(&kvm_global_user_count_lock);
1710                 if (++kvm_global_user_count == 1)
1711                         pseries_disable_reloc_on_exc();
1712                 spin_unlock(&kvm_global_user_count_lock);
1713         }
1714         return 0;
1715 }
1716 
1717 static void kvmppc_core_destroy_vm_pr(struct kvm *kvm)
1718 {
1719 #ifdef CONFIG_PPC64
1720         WARN_ON(!list_empty(&kvm->arch.spapr_tce_tables));
1721 #endif
1722 
1723         if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
1724                 spin_lock(&kvm_global_user_count_lock);
1725                 BUG_ON(kvm_global_user_count == 0);
1726                 if (--kvm_global_user_count == 0)
1727                         pseries_enable_reloc_on_exc();
1728                 spin_unlock(&kvm_global_user_count_lock);
1729         }
1730 }
1731 
1732 static int kvmppc_core_check_processor_compat_pr(void)
1733 {
1734         /*
1735          * Disable KVM for Power9 untill the required bits merged.
1736          */
1737         if (cpu_has_feature(CPU_FTR_ARCH_300))
1738                 return -EIO;
1739         return 0;
1740 }
1741 
1742 static long kvm_arch_vm_ioctl_pr(struct file *filp,
1743                                  unsigned int ioctl, unsigned long arg)
1744 {
1745         return -ENOTTY;
1746 }
1747 
1748 static struct kvmppc_ops kvm_ops_pr = {
1749         .get_sregs = kvm_arch_vcpu_ioctl_get_sregs_pr,
1750         .set_sregs = kvm_arch_vcpu_ioctl_set_sregs_pr,
1751         .get_one_reg = kvmppc_get_one_reg_pr,
1752         .set_one_reg = kvmppc_set_one_reg_pr,
1753         .vcpu_load   = kvmppc_core_vcpu_load_pr,
1754         .vcpu_put    = kvmppc_core_vcpu_put_pr,
1755         .set_msr     = kvmppc_set_msr_pr,
1756         .vcpu_run    = kvmppc_vcpu_run_pr,
1757         .vcpu_create = kvmppc_core_vcpu_create_pr,
1758         .vcpu_free   = kvmppc_core_vcpu_free_pr,
1759         .check_requests = kvmppc_core_check_requests_pr,
1760         .get_dirty_log = kvm_vm_ioctl_get_dirty_log_pr,
1761         .flush_memslot = kvmppc_core_flush_memslot_pr,
1762         .prepare_memory_region = kvmppc_core_prepare_memory_region_pr,
1763         .commit_memory_region = kvmppc_core_commit_memory_region_pr,
1764         .unmap_hva = kvm_unmap_hva_pr,
1765         .unmap_hva_range = kvm_unmap_hva_range_pr,
1766         .age_hva  = kvm_age_hva_pr,
1767         .test_age_hva = kvm_test_age_hva_pr,
1768         .set_spte_hva = kvm_set_spte_hva_pr,
1769         .mmu_destroy  = kvmppc_mmu_destroy_pr,
1770         .free_memslot = kvmppc_core_free_memslot_pr,
1771         .create_memslot = kvmppc_core_create_memslot_pr,
1772         .init_vm = kvmppc_core_init_vm_pr,
1773         .destroy_vm = kvmppc_core_destroy_vm_pr,
1774         .get_smmu_info = kvm_vm_ioctl_get_smmu_info_pr,
1775         .emulate_op = kvmppc_core_emulate_op_pr,
1776         .emulate_mtspr = kvmppc_core_emulate_mtspr_pr,
1777         .emulate_mfspr = kvmppc_core_emulate_mfspr_pr,
1778         .fast_vcpu_kick = kvm_vcpu_kick,
1779         .arch_vm_ioctl  = kvm_arch_vm_ioctl_pr,
1780 #ifdef CONFIG_PPC_BOOK3S_64
1781         .hcall_implemented = kvmppc_hcall_impl_pr,
1782 #endif
1783 };
1784 
1785 
1786 int kvmppc_book3s_init_pr(void)
1787 {
1788         int r;
1789 
1790         r = kvmppc_core_check_processor_compat_pr();
1791         if (r < 0)
1792                 return r;
1793 
1794         kvm_ops_pr.owner = THIS_MODULE;
1795         kvmppc_pr_ops = &kvm_ops_pr;
1796 
1797         r = kvmppc_mmu_hpte_sysinit();
1798         return r;
1799 }
1800 
1801 void kvmppc_book3s_exit_pr(void)
1802 {
1803         kvmppc_pr_ops = NULL;
1804         kvmppc_mmu_hpte_sysexit();
1805 }
1806 
1807 /*
1808  * We only support separate modules for book3s 64
1809  */
1810 #ifdef CONFIG_PPC_BOOK3S_64
1811 
1812 module_init(kvmppc_book3s_init_pr);
1813 module_exit(kvmppc_book3s_exit_pr);
1814 
1815 MODULE_LICENSE("GPL");
1816 MODULE_ALIAS_MISCDEV(KVM_MINOR);
1817 MODULE_ALIAS("devname:kvm");
1818 #endif
1819 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp