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Linux/arch/powerpc/kvm/booke.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  *
  4  * Copyright IBM Corp. 2007
  5  * Copyright 2010-2011 Freescale Semiconductor, Inc.
  6  *
  7  * Authors: Hollis Blanchard <hollisb@us.ibm.com>
  8  *          Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
  9  *          Scott Wood <scottwood@freescale.com>
 10  *          Varun Sethi <varun.sethi@freescale.com>
 11  */
 12 
 13 #include <linux/errno.h>
 14 #include <linux/err.h>
 15 #include <linux/kvm_host.h>
 16 #include <linux/gfp.h>
 17 #include <linux/module.h>
 18 #include <linux/vmalloc.h>
 19 #include <linux/fs.h>
 20 
 21 #include <asm/cputable.h>
 22 #include <linux/uaccess.h>
 23 #include <asm/kvm_ppc.h>
 24 #include <asm/cacheflush.h>
 25 #include <asm/dbell.h>
 26 #include <asm/hw_irq.h>
 27 #include <asm/irq.h>
 28 #include <asm/time.h>
 29 
 30 #include "timing.h"
 31 #include "booke.h"
 32 
 33 #define CREATE_TRACE_POINTS
 34 #include "trace_booke.h"
 35 
 36 unsigned long kvmppc_booke_handlers;
 37 
 38 #define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM
 39 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
 40 
 41 struct kvm_stats_debugfs_item debugfs_entries[] = {
 42         { "mmio",       VCPU_STAT(mmio_exits) },
 43         { "sig",        VCPU_STAT(signal_exits) },
 44         { "itlb_r",     VCPU_STAT(itlb_real_miss_exits) },
 45         { "itlb_v",     VCPU_STAT(itlb_virt_miss_exits) },
 46         { "dtlb_r",     VCPU_STAT(dtlb_real_miss_exits) },
 47         { "dtlb_v",     VCPU_STAT(dtlb_virt_miss_exits) },
 48         { "sysc",       VCPU_STAT(syscall_exits) },
 49         { "isi",        VCPU_STAT(isi_exits) },
 50         { "dsi",        VCPU_STAT(dsi_exits) },
 51         { "inst_emu",   VCPU_STAT(emulated_inst_exits) },
 52         { "dec",        VCPU_STAT(dec_exits) },
 53         { "ext_intr",   VCPU_STAT(ext_intr_exits) },
 54         { "halt_successful_poll", VCPU_STAT(halt_successful_poll) },
 55         { "halt_attempted_poll", VCPU_STAT(halt_attempted_poll) },
 56         { "halt_poll_invalid", VCPU_STAT(halt_poll_invalid) },
 57         { "halt_wakeup", VCPU_STAT(halt_wakeup) },
 58         { "doorbell", VCPU_STAT(dbell_exits) },
 59         { "guest doorbell", VCPU_STAT(gdbell_exits) },
 60         { "remote_tlb_flush", VM_STAT(remote_tlb_flush) },
 61         { NULL }
 62 };
 63 
 64 /* TODO: use vcpu_printf() */
 65 void kvmppc_dump_vcpu(struct kvm_vcpu *vcpu)
 66 {
 67         int i;
 68 
 69         printk("pc:   %08lx msr:  %08llx\n", vcpu->arch.regs.nip,
 70                         vcpu->arch.shared->msr);
 71         printk("lr:   %08lx ctr:  %08lx\n", vcpu->arch.regs.link,
 72                         vcpu->arch.regs.ctr);
 73         printk("srr0: %08llx srr1: %08llx\n", vcpu->arch.shared->srr0,
 74                                             vcpu->arch.shared->srr1);
 75 
 76         printk("exceptions: %08lx\n", vcpu->arch.pending_exceptions);
 77 
 78         for (i = 0; i < 32; i += 4) {
 79                 printk("gpr%02d: %08lx %08lx %08lx %08lx\n", i,
 80                        kvmppc_get_gpr(vcpu, i),
 81                        kvmppc_get_gpr(vcpu, i+1),
 82                        kvmppc_get_gpr(vcpu, i+2),
 83                        kvmppc_get_gpr(vcpu, i+3));
 84         }
 85 }
 86 
 87 #ifdef CONFIG_SPE
 88 void kvmppc_vcpu_disable_spe(struct kvm_vcpu *vcpu)
 89 {
 90         preempt_disable();
 91         enable_kernel_spe();
 92         kvmppc_save_guest_spe(vcpu);
 93         disable_kernel_spe();
 94         vcpu->arch.shadow_msr &= ~MSR_SPE;
 95         preempt_enable();
 96 }
 97 
 98 static void kvmppc_vcpu_enable_spe(struct kvm_vcpu *vcpu)
 99 {
100         preempt_disable();
101         enable_kernel_spe();
102         kvmppc_load_guest_spe(vcpu);
103         disable_kernel_spe();
104         vcpu->arch.shadow_msr |= MSR_SPE;
105         preempt_enable();
106 }
107 
108 static void kvmppc_vcpu_sync_spe(struct kvm_vcpu *vcpu)
109 {
110         if (vcpu->arch.shared->msr & MSR_SPE) {
111                 if (!(vcpu->arch.shadow_msr & MSR_SPE))
112                         kvmppc_vcpu_enable_spe(vcpu);
113         } else if (vcpu->arch.shadow_msr & MSR_SPE) {
114                 kvmppc_vcpu_disable_spe(vcpu);
115         }
116 }
117 #else
118 static void kvmppc_vcpu_sync_spe(struct kvm_vcpu *vcpu)
119 {
120 }
121 #endif
122 
123 /*
124  * Load up guest vcpu FP state if it's needed.
125  * It also set the MSR_FP in thread so that host know
126  * we're holding FPU, and then host can help to save
127  * guest vcpu FP state if other threads require to use FPU.
128  * This simulates an FP unavailable fault.
129  *
130  * It requires to be called with preemption disabled.
131  */
132 static inline void kvmppc_load_guest_fp(struct kvm_vcpu *vcpu)
133 {
134 #ifdef CONFIG_PPC_FPU
135         if (!(current->thread.regs->msr & MSR_FP)) {
136                 enable_kernel_fp();
137                 load_fp_state(&vcpu->arch.fp);
138                 disable_kernel_fp();
139                 current->thread.fp_save_area = &vcpu->arch.fp;
140                 current->thread.regs->msr |= MSR_FP;
141         }
142 #endif
143 }
144 
145 /*
146  * Save guest vcpu FP state into thread.
147  * It requires to be called with preemption disabled.
148  */
149 static inline void kvmppc_save_guest_fp(struct kvm_vcpu *vcpu)
150 {
151 #ifdef CONFIG_PPC_FPU
152         if (current->thread.regs->msr & MSR_FP)
153                 giveup_fpu(current);
154         current->thread.fp_save_area = NULL;
155 #endif
156 }
157 
158 static void kvmppc_vcpu_sync_fpu(struct kvm_vcpu *vcpu)
159 {
160 #if defined(CONFIG_PPC_FPU) && !defined(CONFIG_KVM_BOOKE_HV)
161         /* We always treat the FP bit as enabled from the host
162            perspective, so only need to adjust the shadow MSR */
163         vcpu->arch.shadow_msr &= ~MSR_FP;
164         vcpu->arch.shadow_msr |= vcpu->arch.shared->msr & MSR_FP;
165 #endif
166 }
167 
168 /*
169  * Simulate AltiVec unavailable fault to load guest state
170  * from thread to AltiVec unit.
171  * It requires to be called with preemption disabled.
172  */
173 static inline void kvmppc_load_guest_altivec(struct kvm_vcpu *vcpu)
174 {
175 #ifdef CONFIG_ALTIVEC
176         if (cpu_has_feature(CPU_FTR_ALTIVEC)) {
177                 if (!(current->thread.regs->msr & MSR_VEC)) {
178                         enable_kernel_altivec();
179                         load_vr_state(&vcpu->arch.vr);
180                         disable_kernel_altivec();
181                         current->thread.vr_save_area = &vcpu->arch.vr;
182                         current->thread.regs->msr |= MSR_VEC;
183                 }
184         }
185 #endif
186 }
187 
188 /*
189  * Save guest vcpu AltiVec state into thread.
190  * It requires to be called with preemption disabled.
191  */
192 static inline void kvmppc_save_guest_altivec(struct kvm_vcpu *vcpu)
193 {
194 #ifdef CONFIG_ALTIVEC
195         if (cpu_has_feature(CPU_FTR_ALTIVEC)) {
196                 if (current->thread.regs->msr & MSR_VEC)
197                         giveup_altivec(current);
198                 current->thread.vr_save_area = NULL;
199         }
200 #endif
201 }
202 
203 static void kvmppc_vcpu_sync_debug(struct kvm_vcpu *vcpu)
204 {
205         /* Synchronize guest's desire to get debug interrupts into shadow MSR */
206 #ifndef CONFIG_KVM_BOOKE_HV
207         vcpu->arch.shadow_msr &= ~MSR_DE;
208         vcpu->arch.shadow_msr |= vcpu->arch.shared->msr & MSR_DE;
209 #endif
210 
211         /* Force enable debug interrupts when user space wants to debug */
212         if (vcpu->guest_debug) {
213 #ifdef CONFIG_KVM_BOOKE_HV
214                 /*
215                  * Since there is no shadow MSR, sync MSR_DE into the guest
216                  * visible MSR.
217                  */
218                 vcpu->arch.shared->msr |= MSR_DE;
219 #else
220                 vcpu->arch.shadow_msr |= MSR_DE;
221                 vcpu->arch.shared->msr &= ~MSR_DE;
222 #endif
223         }
224 }
225 
226 /*
227  * Helper function for "full" MSR writes.  No need to call this if only
228  * EE/CE/ME/DE/RI are changing.
229  */
230 void kvmppc_set_msr(struct kvm_vcpu *vcpu, u32 new_msr)
231 {
232         u32 old_msr = vcpu->arch.shared->msr;
233 
234 #ifdef CONFIG_KVM_BOOKE_HV
235         new_msr |= MSR_GS;
236 #endif
237 
238         vcpu->arch.shared->msr = new_msr;
239 
240         kvmppc_mmu_msr_notify(vcpu, old_msr);
241         kvmppc_vcpu_sync_spe(vcpu);
242         kvmppc_vcpu_sync_fpu(vcpu);
243         kvmppc_vcpu_sync_debug(vcpu);
244 }
245 
246 static void kvmppc_booke_queue_irqprio(struct kvm_vcpu *vcpu,
247                                        unsigned int priority)
248 {
249         trace_kvm_booke_queue_irqprio(vcpu, priority);
250         set_bit(priority, &vcpu->arch.pending_exceptions);
251 }
252 
253 void kvmppc_core_queue_dtlb_miss(struct kvm_vcpu *vcpu,
254                                  ulong dear_flags, ulong esr_flags)
255 {
256         vcpu->arch.queued_dear = dear_flags;
257         vcpu->arch.queued_esr = esr_flags;
258         kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_DTLB_MISS);
259 }
260 
261 void kvmppc_core_queue_data_storage(struct kvm_vcpu *vcpu,
262                                     ulong dear_flags, ulong esr_flags)
263 {
264         vcpu->arch.queued_dear = dear_flags;
265         vcpu->arch.queued_esr = esr_flags;
266         kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_DATA_STORAGE);
267 }
268 
269 void kvmppc_core_queue_itlb_miss(struct kvm_vcpu *vcpu)
270 {
271         kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_ITLB_MISS);
272 }
273 
274 void kvmppc_core_queue_inst_storage(struct kvm_vcpu *vcpu, ulong esr_flags)
275 {
276         vcpu->arch.queued_esr = esr_flags;
277         kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_INST_STORAGE);
278 }
279 
280 static void kvmppc_core_queue_alignment(struct kvm_vcpu *vcpu, ulong dear_flags,
281                                         ulong esr_flags)
282 {
283         vcpu->arch.queued_dear = dear_flags;
284         vcpu->arch.queued_esr = esr_flags;
285         kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_ALIGNMENT);
286 }
287 
288 void kvmppc_core_queue_program(struct kvm_vcpu *vcpu, ulong esr_flags)
289 {
290         vcpu->arch.queued_esr = esr_flags;
291         kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_PROGRAM);
292 }
293 
294 void kvmppc_core_queue_fpunavail(struct kvm_vcpu *vcpu)
295 {
296         kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_FP_UNAVAIL);
297 }
298 
299 #ifdef CONFIG_ALTIVEC
300 void kvmppc_core_queue_vec_unavail(struct kvm_vcpu *vcpu)
301 {
302         kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_ALTIVEC_UNAVAIL);
303 }
304 #endif
305 
306 void kvmppc_core_queue_dec(struct kvm_vcpu *vcpu)
307 {
308         kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_DECREMENTER);
309 }
310 
311 int kvmppc_core_pending_dec(struct kvm_vcpu *vcpu)
312 {
313         return test_bit(BOOKE_IRQPRIO_DECREMENTER, &vcpu->arch.pending_exceptions);
314 }
315 
316 void kvmppc_core_dequeue_dec(struct kvm_vcpu *vcpu)
317 {
318         clear_bit(BOOKE_IRQPRIO_DECREMENTER, &vcpu->arch.pending_exceptions);
319 }
320 
321 void kvmppc_core_queue_external(struct kvm_vcpu *vcpu,
322                                 struct kvm_interrupt *irq)
323 {
324         unsigned int prio = BOOKE_IRQPRIO_EXTERNAL;
325 
326         if (irq->irq == KVM_INTERRUPT_SET_LEVEL)
327                 prio = BOOKE_IRQPRIO_EXTERNAL_LEVEL;
328 
329         kvmppc_booke_queue_irqprio(vcpu, prio);
330 }
331 
332 void kvmppc_core_dequeue_external(struct kvm_vcpu *vcpu)
333 {
334         clear_bit(BOOKE_IRQPRIO_EXTERNAL, &vcpu->arch.pending_exceptions);
335         clear_bit(BOOKE_IRQPRIO_EXTERNAL_LEVEL, &vcpu->arch.pending_exceptions);
336 }
337 
338 static void kvmppc_core_queue_watchdog(struct kvm_vcpu *vcpu)
339 {
340         kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_WATCHDOG);
341 }
342 
343 static void kvmppc_core_dequeue_watchdog(struct kvm_vcpu *vcpu)
344 {
345         clear_bit(BOOKE_IRQPRIO_WATCHDOG, &vcpu->arch.pending_exceptions);
346 }
347 
348 void kvmppc_core_queue_debug(struct kvm_vcpu *vcpu)
349 {
350         kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_DEBUG);
351 }
352 
353 void kvmppc_core_dequeue_debug(struct kvm_vcpu *vcpu)
354 {
355         clear_bit(BOOKE_IRQPRIO_DEBUG, &vcpu->arch.pending_exceptions);
356 }
357 
358 static void set_guest_srr(struct kvm_vcpu *vcpu, unsigned long srr0, u32 srr1)
359 {
360         kvmppc_set_srr0(vcpu, srr0);
361         kvmppc_set_srr1(vcpu, srr1);
362 }
363 
364 static void set_guest_csrr(struct kvm_vcpu *vcpu, unsigned long srr0, u32 srr1)
365 {
366         vcpu->arch.csrr0 = srr0;
367         vcpu->arch.csrr1 = srr1;
368 }
369 
370 static void set_guest_dsrr(struct kvm_vcpu *vcpu, unsigned long srr0, u32 srr1)
371 {
372         if (cpu_has_feature(CPU_FTR_DEBUG_LVL_EXC)) {
373                 vcpu->arch.dsrr0 = srr0;
374                 vcpu->arch.dsrr1 = srr1;
375         } else {
376                 set_guest_csrr(vcpu, srr0, srr1);
377         }
378 }
379 
380 static void set_guest_mcsrr(struct kvm_vcpu *vcpu, unsigned long srr0, u32 srr1)
381 {
382         vcpu->arch.mcsrr0 = srr0;
383         vcpu->arch.mcsrr1 = srr1;
384 }
385 
386 /* Deliver the interrupt of the corresponding priority, if possible. */
387 static int kvmppc_booke_irqprio_deliver(struct kvm_vcpu *vcpu,
388                                         unsigned int priority)
389 {
390         int allowed = 0;
391         ulong msr_mask = 0;
392         bool update_esr = false, update_dear = false, update_epr = false;
393         ulong crit_raw = vcpu->arch.shared->critical;
394         ulong crit_r1 = kvmppc_get_gpr(vcpu, 1);
395         bool crit;
396         bool keep_irq = false;
397         enum int_class int_class;
398         ulong new_msr = vcpu->arch.shared->msr;
399 
400         /* Truncate crit indicators in 32 bit mode */
401         if (!(vcpu->arch.shared->msr & MSR_SF)) {
402                 crit_raw &= 0xffffffff;
403                 crit_r1 &= 0xffffffff;
404         }
405 
406         /* Critical section when crit == r1 */
407         crit = (crit_raw == crit_r1);
408         /* ... and we're in supervisor mode */
409         crit = crit && !(vcpu->arch.shared->msr & MSR_PR);
410 
411         if (priority == BOOKE_IRQPRIO_EXTERNAL_LEVEL) {
412                 priority = BOOKE_IRQPRIO_EXTERNAL;
413                 keep_irq = true;
414         }
415 
416         if ((priority == BOOKE_IRQPRIO_EXTERNAL) && vcpu->arch.epr_flags)
417                 update_epr = true;
418 
419         switch (priority) {
420         case BOOKE_IRQPRIO_DTLB_MISS:
421         case BOOKE_IRQPRIO_DATA_STORAGE:
422         case BOOKE_IRQPRIO_ALIGNMENT:
423                 update_dear = true;
424                 /* fall through */
425         case BOOKE_IRQPRIO_INST_STORAGE:
426         case BOOKE_IRQPRIO_PROGRAM:
427                 update_esr = true;
428                 /* fall through */
429         case BOOKE_IRQPRIO_ITLB_MISS:
430         case BOOKE_IRQPRIO_SYSCALL:
431         case BOOKE_IRQPRIO_FP_UNAVAIL:
432 #ifdef CONFIG_SPE_POSSIBLE
433         case BOOKE_IRQPRIO_SPE_UNAVAIL:
434         case BOOKE_IRQPRIO_SPE_FP_DATA:
435         case BOOKE_IRQPRIO_SPE_FP_ROUND:
436 #endif
437 #ifdef CONFIG_ALTIVEC
438         case BOOKE_IRQPRIO_ALTIVEC_UNAVAIL:
439         case BOOKE_IRQPRIO_ALTIVEC_ASSIST:
440 #endif
441         case BOOKE_IRQPRIO_AP_UNAVAIL:
442                 allowed = 1;
443                 msr_mask = MSR_CE | MSR_ME | MSR_DE;
444                 int_class = INT_CLASS_NONCRIT;
445                 break;
446         case BOOKE_IRQPRIO_WATCHDOG:
447         case BOOKE_IRQPRIO_CRITICAL:
448         case BOOKE_IRQPRIO_DBELL_CRIT:
449                 allowed = vcpu->arch.shared->msr & MSR_CE;
450                 allowed = allowed && !crit;
451                 msr_mask = MSR_ME;
452                 int_class = INT_CLASS_CRIT;
453                 break;
454         case BOOKE_IRQPRIO_MACHINE_CHECK:
455                 allowed = vcpu->arch.shared->msr & MSR_ME;
456                 allowed = allowed && !crit;
457                 int_class = INT_CLASS_MC;
458                 break;
459         case BOOKE_IRQPRIO_DECREMENTER:
460         case BOOKE_IRQPRIO_FIT:
461                 keep_irq = true;
462                 /* fall through */
463         case BOOKE_IRQPRIO_EXTERNAL:
464         case BOOKE_IRQPRIO_DBELL:
465                 allowed = vcpu->arch.shared->msr & MSR_EE;
466                 allowed = allowed && !crit;
467                 msr_mask = MSR_CE | MSR_ME | MSR_DE;
468                 int_class = INT_CLASS_NONCRIT;
469                 break;
470         case BOOKE_IRQPRIO_DEBUG:
471                 allowed = vcpu->arch.shared->msr & MSR_DE;
472                 allowed = allowed && !crit;
473                 msr_mask = MSR_ME;
474                 if (cpu_has_feature(CPU_FTR_DEBUG_LVL_EXC))
475                         int_class = INT_CLASS_DBG;
476                 else
477                         int_class = INT_CLASS_CRIT;
478 
479                 break;
480         }
481 
482         if (allowed) {
483                 switch (int_class) {
484                 case INT_CLASS_NONCRIT:
485                         set_guest_srr(vcpu, vcpu->arch.regs.nip,
486                                       vcpu->arch.shared->msr);
487                         break;
488                 case INT_CLASS_CRIT:
489                         set_guest_csrr(vcpu, vcpu->arch.regs.nip,
490                                        vcpu->arch.shared->msr);
491                         break;
492                 case INT_CLASS_DBG:
493                         set_guest_dsrr(vcpu, vcpu->arch.regs.nip,
494                                        vcpu->arch.shared->msr);
495                         break;
496                 case INT_CLASS_MC:
497                         set_guest_mcsrr(vcpu, vcpu->arch.regs.nip,
498                                         vcpu->arch.shared->msr);
499                         break;
500                 }
501 
502                 vcpu->arch.regs.nip = vcpu->arch.ivpr |
503                                         vcpu->arch.ivor[priority];
504                 if (update_esr == true)
505                         kvmppc_set_esr(vcpu, vcpu->arch.queued_esr);
506                 if (update_dear == true)
507                         kvmppc_set_dar(vcpu, vcpu->arch.queued_dear);
508                 if (update_epr == true) {
509                         if (vcpu->arch.epr_flags & KVMPPC_EPR_USER)
510                                 kvm_make_request(KVM_REQ_EPR_EXIT, vcpu);
511                         else if (vcpu->arch.epr_flags & KVMPPC_EPR_KERNEL) {
512                                 BUG_ON(vcpu->arch.irq_type != KVMPPC_IRQ_MPIC);
513                                 kvmppc_mpic_set_epr(vcpu);
514                         }
515                 }
516 
517                 new_msr &= msr_mask;
518 #if defined(CONFIG_64BIT)
519                 if (vcpu->arch.epcr & SPRN_EPCR_ICM)
520                         new_msr |= MSR_CM;
521 #endif
522                 kvmppc_set_msr(vcpu, new_msr);
523 
524                 if (!keep_irq)
525                         clear_bit(priority, &vcpu->arch.pending_exceptions);
526         }
527 
528 #ifdef CONFIG_KVM_BOOKE_HV
529         /*
530          * If an interrupt is pending but masked, raise a guest doorbell
531          * so that we are notified when the guest enables the relevant
532          * MSR bit.
533          */
534         if (vcpu->arch.pending_exceptions & BOOKE_IRQMASK_EE)
535                 kvmppc_set_pending_interrupt(vcpu, INT_CLASS_NONCRIT);
536         if (vcpu->arch.pending_exceptions & BOOKE_IRQMASK_CE)
537                 kvmppc_set_pending_interrupt(vcpu, INT_CLASS_CRIT);
538         if (vcpu->arch.pending_exceptions & BOOKE_IRQPRIO_MACHINE_CHECK)
539                 kvmppc_set_pending_interrupt(vcpu, INT_CLASS_MC);
540 #endif
541 
542         return allowed;
543 }
544 
545 /*
546  * Return the number of jiffies until the next timeout.  If the timeout is
547  * longer than the NEXT_TIMER_MAX_DELTA, then return NEXT_TIMER_MAX_DELTA
548  * because the larger value can break the timer APIs.
549  */
550 static unsigned long watchdog_next_timeout(struct kvm_vcpu *vcpu)
551 {
552         u64 tb, wdt_tb, wdt_ticks = 0;
553         u64 nr_jiffies = 0;
554         u32 period = TCR_GET_WP(vcpu->arch.tcr);
555 
556         wdt_tb = 1ULL << (63 - period);
557         tb = get_tb();
558         /*
559          * The watchdog timeout will hapeen when TB bit corresponding
560          * to watchdog will toggle from 0 to 1.
561          */
562         if (tb & wdt_tb)
563                 wdt_ticks = wdt_tb;
564 
565         wdt_ticks += wdt_tb - (tb & (wdt_tb - 1));
566 
567         /* Convert timebase ticks to jiffies */
568         nr_jiffies = wdt_ticks;
569 
570         if (do_div(nr_jiffies, tb_ticks_per_jiffy))
571                 nr_jiffies++;
572 
573         return min_t(unsigned long long, nr_jiffies, NEXT_TIMER_MAX_DELTA);
574 }
575 
576 static void arm_next_watchdog(struct kvm_vcpu *vcpu)
577 {
578         unsigned long nr_jiffies;
579         unsigned long flags;
580 
581         /*
582          * If TSR_ENW and TSR_WIS are not set then no need to exit to
583          * userspace, so clear the KVM_REQ_WATCHDOG request.
584          */
585         if ((vcpu->arch.tsr & (TSR_ENW | TSR_WIS)) != (TSR_ENW | TSR_WIS))
586                 kvm_clear_request(KVM_REQ_WATCHDOG, vcpu);
587 
588         spin_lock_irqsave(&vcpu->arch.wdt_lock, flags);
589         nr_jiffies = watchdog_next_timeout(vcpu);
590         /*
591          * If the number of jiffies of watchdog timer >= NEXT_TIMER_MAX_DELTA
592          * then do not run the watchdog timer as this can break timer APIs.
593          */
594         if (nr_jiffies < NEXT_TIMER_MAX_DELTA)
595                 mod_timer(&vcpu->arch.wdt_timer, jiffies + nr_jiffies);
596         else
597                 del_timer(&vcpu->arch.wdt_timer);
598         spin_unlock_irqrestore(&vcpu->arch.wdt_lock, flags);
599 }
600 
601 void kvmppc_watchdog_func(struct timer_list *t)
602 {
603         struct kvm_vcpu *vcpu = from_timer(vcpu, t, arch.wdt_timer);
604         u32 tsr, new_tsr;
605         int final;
606 
607         do {
608                 new_tsr = tsr = vcpu->arch.tsr;
609                 final = 0;
610 
611                 /* Time out event */
612                 if (tsr & TSR_ENW) {
613                         if (tsr & TSR_WIS)
614                                 final = 1;
615                         else
616                                 new_tsr = tsr | TSR_WIS;
617                 } else {
618                         new_tsr = tsr | TSR_ENW;
619                 }
620         } while (cmpxchg(&vcpu->arch.tsr, tsr, new_tsr) != tsr);
621 
622         if (new_tsr & TSR_WIS) {
623                 smp_wmb();
624                 kvm_make_request(KVM_REQ_PENDING_TIMER, vcpu);
625                 kvm_vcpu_kick(vcpu);
626         }
627 
628         /*
629          * If this is final watchdog expiry and some action is required
630          * then exit to userspace.
631          */
632         if (final && (vcpu->arch.tcr & TCR_WRC_MASK) &&
633             vcpu->arch.watchdog_enabled) {
634                 smp_wmb();
635                 kvm_make_request(KVM_REQ_WATCHDOG, vcpu);
636                 kvm_vcpu_kick(vcpu);
637         }
638 
639         /*
640          * Stop running the watchdog timer after final expiration to
641          * prevent the host from being flooded with timers if the
642          * guest sets a short period.
643          * Timers will resume when TSR/TCR is updated next time.
644          */
645         if (!final)
646                 arm_next_watchdog(vcpu);
647 }
648 
649 static void update_timer_ints(struct kvm_vcpu *vcpu)
650 {
651         if ((vcpu->arch.tcr & TCR_DIE) && (vcpu->arch.tsr & TSR_DIS))
652                 kvmppc_core_queue_dec(vcpu);
653         else
654                 kvmppc_core_dequeue_dec(vcpu);
655 
656         if ((vcpu->arch.tcr & TCR_WIE) && (vcpu->arch.tsr & TSR_WIS))
657                 kvmppc_core_queue_watchdog(vcpu);
658         else
659                 kvmppc_core_dequeue_watchdog(vcpu);
660 }
661 
662 static void kvmppc_core_check_exceptions(struct kvm_vcpu *vcpu)
663 {
664         unsigned long *pending = &vcpu->arch.pending_exceptions;
665         unsigned int priority;
666 
667         priority = __ffs(*pending);
668         while (priority < BOOKE_IRQPRIO_MAX) {
669                 if (kvmppc_booke_irqprio_deliver(vcpu, priority))
670                         break;
671 
672                 priority = find_next_bit(pending,
673                                          BITS_PER_BYTE * sizeof(*pending),
674                                          priority + 1);
675         }
676 
677         /* Tell the guest about our interrupt status */
678         vcpu->arch.shared->int_pending = !!*pending;
679 }
680 
681 /* Check pending exceptions and deliver one, if possible. */
682 int kvmppc_core_prepare_to_enter(struct kvm_vcpu *vcpu)
683 {
684         int r = 0;
685         WARN_ON_ONCE(!irqs_disabled());
686 
687         kvmppc_core_check_exceptions(vcpu);
688 
689         if (kvm_request_pending(vcpu)) {
690                 /* Exception delivery raised request; start over */
691                 return 1;
692         }
693 
694         if (vcpu->arch.shared->msr & MSR_WE) {
695                 local_irq_enable();
696                 kvm_vcpu_block(vcpu);
697                 kvm_clear_request(KVM_REQ_UNHALT, vcpu);
698                 hard_irq_disable();
699 
700                 kvmppc_set_exit_type(vcpu, EMULATED_MTMSRWE_EXITS);
701                 r = 1;
702         };
703 
704         return r;
705 }
706 
707 int kvmppc_core_check_requests(struct kvm_vcpu *vcpu)
708 {
709         int r = 1; /* Indicate we want to get back into the guest */
710 
711         if (kvm_check_request(KVM_REQ_PENDING_TIMER, vcpu))
712                 update_timer_ints(vcpu);
713 #if defined(CONFIG_KVM_E500V2) || defined(CONFIG_KVM_E500MC)
714         if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu))
715                 kvmppc_core_flush_tlb(vcpu);
716 #endif
717 
718         if (kvm_check_request(KVM_REQ_WATCHDOG, vcpu)) {
719                 vcpu->run->exit_reason = KVM_EXIT_WATCHDOG;
720                 r = 0;
721         }
722 
723         if (kvm_check_request(KVM_REQ_EPR_EXIT, vcpu)) {
724                 vcpu->run->epr.epr = 0;
725                 vcpu->arch.epr_needed = true;
726                 vcpu->run->exit_reason = KVM_EXIT_EPR;
727                 r = 0;
728         }
729 
730         return r;
731 }
732 
733 int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
734 {
735         int ret, s;
736         struct debug_reg debug;
737 
738         if (!vcpu->arch.sane) {
739                 kvm_run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
740                 return -EINVAL;
741         }
742 
743         s = kvmppc_prepare_to_enter(vcpu);
744         if (s <= 0) {
745                 ret = s;
746                 goto out;
747         }
748         /* interrupts now hard-disabled */
749 
750 #ifdef CONFIG_PPC_FPU
751         /* Save userspace FPU state in stack */
752         enable_kernel_fp();
753 
754         /*
755          * Since we can't trap on MSR_FP in GS-mode, we consider the guest
756          * as always using the FPU.
757          */
758         kvmppc_load_guest_fp(vcpu);
759 #endif
760 
761 #ifdef CONFIG_ALTIVEC
762         /* Save userspace AltiVec state in stack */
763         if (cpu_has_feature(CPU_FTR_ALTIVEC))
764                 enable_kernel_altivec();
765         /*
766          * Since we can't trap on MSR_VEC in GS-mode, we consider the guest
767          * as always using the AltiVec.
768          */
769         kvmppc_load_guest_altivec(vcpu);
770 #endif
771 
772         /* Switch to guest debug context */
773         debug = vcpu->arch.dbg_reg;
774         switch_booke_debug_regs(&debug);
775         debug = current->thread.debug;
776         current->thread.debug = vcpu->arch.dbg_reg;
777 
778         vcpu->arch.pgdir = current->mm->pgd;
779         kvmppc_fix_ee_before_entry();
780 
781         ret = __kvmppc_vcpu_run(kvm_run, vcpu);
782 
783         /* No need for guest_exit. It's done in handle_exit.
784            We also get here with interrupts enabled. */
785 
786         /* Switch back to user space debug context */
787         switch_booke_debug_regs(&debug);
788         current->thread.debug = debug;
789 
790 #ifdef CONFIG_PPC_FPU
791         kvmppc_save_guest_fp(vcpu);
792 #endif
793 
794 #ifdef CONFIG_ALTIVEC
795         kvmppc_save_guest_altivec(vcpu);
796 #endif
797 
798 out:
799         vcpu->mode = OUTSIDE_GUEST_MODE;
800         return ret;
801 }
802 
803 static int emulation_exit(struct kvm_run *run, struct kvm_vcpu *vcpu)
804 {
805         enum emulation_result er;
806 
807         er = kvmppc_emulate_instruction(run, vcpu);
808         switch (er) {
809         case EMULATE_DONE:
810                 /* don't overwrite subtypes, just account kvm_stats */
811                 kvmppc_account_exit_stat(vcpu, EMULATED_INST_EXITS);
812                 /* Future optimization: only reload non-volatiles if
813                  * they were actually modified by emulation. */
814                 return RESUME_GUEST_NV;
815 
816         case EMULATE_AGAIN:
817                 return RESUME_GUEST;
818 
819         case EMULATE_FAIL:
820                 printk(KERN_CRIT "%s: emulation at %lx failed (%08x)\n",
821                        __func__, vcpu->arch.regs.nip, vcpu->arch.last_inst);
822                 /* For debugging, encode the failing instruction and
823                  * report it to userspace. */
824                 run->hw.hardware_exit_reason = ~0ULL << 32;
825                 run->hw.hardware_exit_reason |= vcpu->arch.last_inst;
826                 kvmppc_core_queue_program(vcpu, ESR_PIL);
827                 return RESUME_HOST;
828 
829         case EMULATE_EXIT_USER:
830                 return RESUME_HOST;
831 
832         default:
833                 BUG();
834         }
835 }
836 
837 static int kvmppc_handle_debug(struct kvm_run *run, struct kvm_vcpu *vcpu)
838 {
839         struct debug_reg *dbg_reg = &(vcpu->arch.dbg_reg);
840         u32 dbsr = vcpu->arch.dbsr;
841 
842         if (vcpu->guest_debug == 0) {
843                 /*
844                  * Debug resources belong to Guest.
845                  * Imprecise debug event is not injected
846                  */
847                 if (dbsr & DBSR_IDE) {
848                         dbsr &= ~DBSR_IDE;
849                         if (!dbsr)
850                                 return RESUME_GUEST;
851                 }
852 
853                 if (dbsr && (vcpu->arch.shared->msr & MSR_DE) &&
854                             (vcpu->arch.dbg_reg.dbcr0 & DBCR0_IDM))
855                         kvmppc_core_queue_debug(vcpu);
856 
857                 /* Inject a program interrupt if trap debug is not allowed */
858                 if ((dbsr & DBSR_TIE) && !(vcpu->arch.shared->msr & MSR_DE))
859                         kvmppc_core_queue_program(vcpu, ESR_PTR);
860 
861                 return RESUME_GUEST;
862         }
863 
864         /*
865          * Debug resource owned by userspace.
866          * Clear guest dbsr (vcpu->arch.dbsr)
867          */
868         vcpu->arch.dbsr = 0;
869         run->debug.arch.status = 0;
870         run->debug.arch.address = vcpu->arch.regs.nip;
871 
872         if (dbsr & (DBSR_IAC1 | DBSR_IAC2 | DBSR_IAC3 | DBSR_IAC4)) {
873                 run->debug.arch.status |= KVMPPC_DEBUG_BREAKPOINT;
874         } else {
875                 if (dbsr & (DBSR_DAC1W | DBSR_DAC2W))
876                         run->debug.arch.status |= KVMPPC_DEBUG_WATCH_WRITE;
877                 else if (dbsr & (DBSR_DAC1R | DBSR_DAC2R))
878                         run->debug.arch.status |= KVMPPC_DEBUG_WATCH_READ;
879                 if (dbsr & (DBSR_DAC1R | DBSR_DAC1W))
880                         run->debug.arch.address = dbg_reg->dac1;
881                 else if (dbsr & (DBSR_DAC2R | DBSR_DAC2W))
882                         run->debug.arch.address = dbg_reg->dac2;
883         }
884 
885         return RESUME_HOST;
886 }
887 
888 static void kvmppc_fill_pt_regs(struct pt_regs *regs)
889 {
890         ulong r1, ip, msr, lr;
891 
892         asm("mr %0, 1" : "=r"(r1));
893         asm("mflr %0" : "=r"(lr));
894         asm("mfmsr %0" : "=r"(msr));
895         asm("bl 1f; 1: mflr %0" : "=r"(ip));
896 
897         memset(regs, 0, sizeof(*regs));
898         regs->gpr[1] = r1;
899         regs->nip = ip;
900         regs->msr = msr;
901         regs->link = lr;
902 }
903 
904 /*
905  * For interrupts needed to be handled by host interrupt handlers,
906  * corresponding host handler are called from here in similar way
907  * (but not exact) as they are called from low level handler
908  * (such as from arch/powerpc/kernel/head_fsl_booke.S).
909  */
910 static void kvmppc_restart_interrupt(struct kvm_vcpu *vcpu,
911                                      unsigned int exit_nr)
912 {
913         struct pt_regs regs;
914 
915         switch (exit_nr) {
916         case BOOKE_INTERRUPT_EXTERNAL:
917                 kvmppc_fill_pt_regs(&regs);
918                 do_IRQ(&regs);
919                 break;
920         case BOOKE_INTERRUPT_DECREMENTER:
921                 kvmppc_fill_pt_regs(&regs);
922                 timer_interrupt(&regs);
923                 break;
924 #if defined(CONFIG_PPC_DOORBELL)
925         case BOOKE_INTERRUPT_DOORBELL:
926                 kvmppc_fill_pt_regs(&regs);
927                 doorbell_exception(&regs);
928                 break;
929 #endif
930         case BOOKE_INTERRUPT_MACHINE_CHECK:
931                 /* FIXME */
932                 break;
933         case BOOKE_INTERRUPT_PERFORMANCE_MONITOR:
934                 kvmppc_fill_pt_regs(&regs);
935                 performance_monitor_exception(&regs);
936                 break;
937         case BOOKE_INTERRUPT_WATCHDOG:
938                 kvmppc_fill_pt_regs(&regs);
939 #ifdef CONFIG_BOOKE_WDT
940                 WatchdogException(&regs);
941 #else
942                 unknown_exception(&regs);
943 #endif
944                 break;
945         case BOOKE_INTERRUPT_CRITICAL:
946                 kvmppc_fill_pt_regs(&regs);
947                 unknown_exception(&regs);
948                 break;
949         case BOOKE_INTERRUPT_DEBUG:
950                 /* Save DBSR before preemption is enabled */
951                 vcpu->arch.dbsr = mfspr(SPRN_DBSR);
952                 kvmppc_clear_dbsr();
953                 break;
954         }
955 }
956 
957 static int kvmppc_resume_inst_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
958                                   enum emulation_result emulated, u32 last_inst)
959 {
960         switch (emulated) {
961         case EMULATE_AGAIN:
962                 return RESUME_GUEST;
963 
964         case EMULATE_FAIL:
965                 pr_debug("%s: load instruction from guest address %lx failed\n",
966                        __func__, vcpu->arch.regs.nip);
967                 /* For debugging, encode the failing instruction and
968                  * report it to userspace. */
969                 run->hw.hardware_exit_reason = ~0ULL << 32;
970                 run->hw.hardware_exit_reason |= last_inst;
971                 kvmppc_core_queue_program(vcpu, ESR_PIL);
972                 return RESUME_HOST;
973 
974         default:
975                 BUG();
976         }
977 }
978 
979 /**
980  * kvmppc_handle_exit
981  *
982  * Return value is in the form (errcode<<2 | RESUME_FLAG_HOST | RESUME_FLAG_NV)
983  */
984 int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
985                        unsigned int exit_nr)
986 {
987         int r = RESUME_HOST;
988         int s;
989         int idx;
990         u32 last_inst = KVM_INST_FETCH_FAILED;
991         enum emulation_result emulated = EMULATE_DONE;
992 
993         /* update before a new last_exit_type is rewritten */
994         kvmppc_update_timing_stats(vcpu);
995 
996         /* restart interrupts if they were meant for the host */
997         kvmppc_restart_interrupt(vcpu, exit_nr);
998 
999         /*
1000          * get last instruction before being preempted
1001          * TODO: for e6500 check also BOOKE_INTERRUPT_LRAT_ERROR & ESR_DATA
1002          */
1003         switch (exit_nr) {
1004         case BOOKE_INTERRUPT_DATA_STORAGE:
1005         case BOOKE_INTERRUPT_DTLB_MISS:
1006         case BOOKE_INTERRUPT_HV_PRIV:
1007                 emulated = kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst);
1008                 break;
1009         case BOOKE_INTERRUPT_PROGRAM:
1010                 /* SW breakpoints arrive as illegal instructions on HV */
1011                 if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP)
1012                         emulated = kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst);
1013                 break;
1014         default:
1015                 break;
1016         }
1017 
1018         trace_kvm_exit(exit_nr, vcpu);
1019         guest_exit_irqoff();
1020 
1021         local_irq_enable();
1022 
1023         run->exit_reason = KVM_EXIT_UNKNOWN;
1024         run->ready_for_interrupt_injection = 1;
1025 
1026         if (emulated != EMULATE_DONE) {
1027                 r = kvmppc_resume_inst_load(run, vcpu, emulated, last_inst);
1028                 goto out;
1029         }
1030 
1031         switch (exit_nr) {
1032         case BOOKE_INTERRUPT_MACHINE_CHECK:
1033                 printk("MACHINE CHECK: %lx\n", mfspr(SPRN_MCSR));
1034                 kvmppc_dump_vcpu(vcpu);
1035                 /* For debugging, send invalid exit reason to user space */
1036                 run->hw.hardware_exit_reason = ~1ULL << 32;
1037                 run->hw.hardware_exit_reason |= mfspr(SPRN_MCSR);
1038                 r = RESUME_HOST;
1039                 break;
1040 
1041         case BOOKE_INTERRUPT_EXTERNAL:
1042                 kvmppc_account_exit(vcpu, EXT_INTR_EXITS);
1043                 r = RESUME_GUEST;
1044                 break;
1045 
1046         case BOOKE_INTERRUPT_DECREMENTER:
1047                 kvmppc_account_exit(vcpu, DEC_EXITS);
1048                 r = RESUME_GUEST;
1049                 break;
1050 
1051         case BOOKE_INTERRUPT_WATCHDOG:
1052                 r = RESUME_GUEST;
1053                 break;
1054 
1055         case BOOKE_INTERRUPT_DOORBELL:
1056                 kvmppc_account_exit(vcpu, DBELL_EXITS);
1057                 r = RESUME_GUEST;
1058                 break;
1059 
1060         case BOOKE_INTERRUPT_GUEST_DBELL_CRIT:
1061                 kvmppc_account_exit(vcpu, GDBELL_EXITS);
1062 
1063                 /*
1064                  * We are here because there is a pending guest interrupt
1065                  * which could not be delivered as MSR_CE or MSR_ME was not
1066                  * set.  Once we break from here we will retry delivery.
1067                  */
1068                 r = RESUME_GUEST;
1069                 break;
1070 
1071         case BOOKE_INTERRUPT_GUEST_DBELL:
1072                 kvmppc_account_exit(vcpu, GDBELL_EXITS);
1073 
1074                 /*
1075                  * We are here because there is a pending guest interrupt
1076                  * which could not be delivered as MSR_EE was not set.  Once
1077                  * we break from here we will retry delivery.
1078                  */
1079                 r = RESUME_GUEST;
1080                 break;
1081 
1082         case BOOKE_INTERRUPT_PERFORMANCE_MONITOR:
1083                 r = RESUME_GUEST;
1084                 break;
1085 
1086         case BOOKE_INTERRUPT_HV_PRIV:
1087                 r = emulation_exit(run, vcpu);
1088                 break;
1089 
1090         case BOOKE_INTERRUPT_PROGRAM:
1091                 if ((vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP) &&
1092                         (last_inst == KVMPPC_INST_SW_BREAKPOINT)) {
1093                         /*
1094                          * We are here because of an SW breakpoint instr,
1095                          * so lets return to host to handle.
1096                          */
1097                         r = kvmppc_handle_debug(run, vcpu);
1098                         run->exit_reason = KVM_EXIT_DEBUG;
1099                         kvmppc_account_exit(vcpu, DEBUG_EXITS);
1100                         break;
1101                 }
1102 
1103                 if (vcpu->arch.shared->msr & (MSR_PR | MSR_GS)) {
1104                         /*
1105                          * Program traps generated by user-level software must
1106                          * be handled by the guest kernel.
1107                          *
1108                          * In GS mode, hypervisor privileged instructions trap
1109                          * on BOOKE_INTERRUPT_HV_PRIV, not here, so these are
1110                          * actual program interrupts, handled by the guest.
1111                          */
1112                         kvmppc_core_queue_program(vcpu, vcpu->arch.fault_esr);
1113                         r = RESUME_GUEST;
1114                         kvmppc_account_exit(vcpu, USR_PR_INST);
1115                         break;
1116                 }
1117 
1118                 r = emulation_exit(run, vcpu);
1119                 break;
1120 
1121         case BOOKE_INTERRUPT_FP_UNAVAIL:
1122                 kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_FP_UNAVAIL);
1123                 kvmppc_account_exit(vcpu, FP_UNAVAIL);
1124                 r = RESUME_GUEST;
1125                 break;
1126 
1127 #ifdef CONFIG_SPE
1128         case BOOKE_INTERRUPT_SPE_UNAVAIL: {
1129                 if (vcpu->arch.shared->msr & MSR_SPE)
1130                         kvmppc_vcpu_enable_spe(vcpu);
1131                 else
1132                         kvmppc_booke_queue_irqprio(vcpu,
1133                                                    BOOKE_IRQPRIO_SPE_UNAVAIL);
1134                 r = RESUME_GUEST;
1135                 break;
1136         }
1137 
1138         case BOOKE_INTERRUPT_SPE_FP_DATA:
1139                 kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_SPE_FP_DATA);
1140                 r = RESUME_GUEST;
1141                 break;
1142 
1143         case BOOKE_INTERRUPT_SPE_FP_ROUND:
1144                 kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_SPE_FP_ROUND);
1145                 r = RESUME_GUEST;
1146                 break;
1147 #elif defined(CONFIG_SPE_POSSIBLE)
1148         case BOOKE_INTERRUPT_SPE_UNAVAIL:
1149                 /*
1150                  * Guest wants SPE, but host kernel doesn't support it.  Send
1151                  * an "unimplemented operation" program check to the guest.
1152                  */
1153                 kvmppc_core_queue_program(vcpu, ESR_PUO | ESR_SPV);
1154                 r = RESUME_GUEST;
1155                 break;
1156 
1157         /*
1158          * These really should never happen without CONFIG_SPE,
1159          * as we should never enable the real MSR[SPE] in the guest.
1160          */
1161         case BOOKE_INTERRUPT_SPE_FP_DATA:
1162         case BOOKE_INTERRUPT_SPE_FP_ROUND:
1163                 printk(KERN_CRIT "%s: unexpected SPE interrupt %u at %08lx\n",
1164                        __func__, exit_nr, vcpu->arch.regs.nip);
1165                 run->hw.hardware_exit_reason = exit_nr;
1166                 r = RESUME_HOST;
1167                 break;
1168 #endif /* CONFIG_SPE_POSSIBLE */
1169 
1170 /*
1171  * On cores with Vector category, KVM is loaded only if CONFIG_ALTIVEC,
1172  * see kvmppc_core_check_processor_compat().
1173  */
1174 #ifdef CONFIG_ALTIVEC
1175         case BOOKE_INTERRUPT_ALTIVEC_UNAVAIL:
1176                 kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_ALTIVEC_UNAVAIL);
1177                 r = RESUME_GUEST;
1178                 break;
1179 
1180         case BOOKE_INTERRUPT_ALTIVEC_ASSIST:
1181                 kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_ALTIVEC_ASSIST);
1182                 r = RESUME_GUEST;
1183                 break;
1184 #endif
1185 
1186         case BOOKE_INTERRUPT_DATA_STORAGE:
1187                 kvmppc_core_queue_data_storage(vcpu, vcpu->arch.fault_dear,
1188                                                vcpu->arch.fault_esr);
1189                 kvmppc_account_exit(vcpu, DSI_EXITS);
1190                 r = RESUME_GUEST;
1191                 break;
1192 
1193         case BOOKE_INTERRUPT_INST_STORAGE:
1194                 kvmppc_core_queue_inst_storage(vcpu, vcpu->arch.fault_esr);
1195                 kvmppc_account_exit(vcpu, ISI_EXITS);
1196                 r = RESUME_GUEST;
1197                 break;
1198 
1199         case BOOKE_INTERRUPT_ALIGNMENT:
1200                 kvmppc_core_queue_alignment(vcpu, vcpu->arch.fault_dear,
1201                                             vcpu->arch.fault_esr);
1202                 r = RESUME_GUEST;
1203                 break;
1204 
1205 #ifdef CONFIG_KVM_BOOKE_HV
1206         case BOOKE_INTERRUPT_HV_SYSCALL:
1207                 if (!(vcpu->arch.shared->msr & MSR_PR)) {
1208                         kvmppc_set_gpr(vcpu, 3, kvmppc_kvm_pv(vcpu));
1209                 } else {
1210                         /*
1211                          * hcall from guest userspace -- send privileged
1212                          * instruction program check.
1213                          */
1214                         kvmppc_core_queue_program(vcpu, ESR_PPR);
1215                 }
1216 
1217                 r = RESUME_GUEST;
1218                 break;
1219 #else
1220         case BOOKE_INTERRUPT_SYSCALL:
1221                 if (!(vcpu->arch.shared->msr & MSR_PR) &&
1222                     (((u32)kvmppc_get_gpr(vcpu, 0)) == KVM_SC_MAGIC_R0)) {
1223                         /* KVM PV hypercalls */
1224                         kvmppc_set_gpr(vcpu, 3, kvmppc_kvm_pv(vcpu));
1225                         r = RESUME_GUEST;
1226                 } else {
1227                         /* Guest syscalls */
1228                         kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_SYSCALL);
1229                 }
1230                 kvmppc_account_exit(vcpu, SYSCALL_EXITS);
1231                 r = RESUME_GUEST;
1232                 break;
1233 #endif
1234 
1235         case BOOKE_INTERRUPT_DTLB_MISS: {
1236                 unsigned long eaddr = vcpu->arch.fault_dear;
1237                 int gtlb_index;
1238                 gpa_t gpaddr;
1239                 gfn_t gfn;
1240 
1241 #ifdef CONFIG_KVM_E500V2
1242                 if (!(vcpu->arch.shared->msr & MSR_PR) &&
1243                     (eaddr & PAGE_MASK) == vcpu->arch.magic_page_ea) {
1244                         kvmppc_map_magic(vcpu);
1245                         kvmppc_account_exit(vcpu, DTLB_VIRT_MISS_EXITS);
1246                         r = RESUME_GUEST;
1247 
1248                         break;
1249                 }
1250 #endif
1251 
1252                 /* Check the guest TLB. */
1253                 gtlb_index = kvmppc_mmu_dtlb_index(vcpu, eaddr);
1254                 if (gtlb_index < 0) {
1255                         /* The guest didn't have a mapping for it. */
1256                         kvmppc_core_queue_dtlb_miss(vcpu,
1257                                                     vcpu->arch.fault_dear,
1258                                                     vcpu->arch.fault_esr);
1259                         kvmppc_mmu_dtlb_miss(vcpu);
1260                         kvmppc_account_exit(vcpu, DTLB_REAL_MISS_EXITS);
1261                         r = RESUME_GUEST;
1262                         break;
1263                 }
1264 
1265                 idx = srcu_read_lock(&vcpu->kvm->srcu);
1266 
1267                 gpaddr = kvmppc_mmu_xlate(vcpu, gtlb_index, eaddr);
1268                 gfn = gpaddr >> PAGE_SHIFT;
1269 
1270                 if (kvm_is_visible_gfn(vcpu->kvm, gfn)) {
1271                         /* The guest TLB had a mapping, but the shadow TLB
1272                          * didn't, and it is RAM. This could be because:
1273                          * a) the entry is mapping the host kernel, or
1274                          * b) the guest used a large mapping which we're faking
1275                          * Either way, we need to satisfy the fault without
1276                          * invoking the guest. */
1277                         kvmppc_mmu_map(vcpu, eaddr, gpaddr, gtlb_index);
1278                         kvmppc_account_exit(vcpu, DTLB_VIRT_MISS_EXITS);
1279                         r = RESUME_GUEST;
1280                 } else {
1281                         /* Guest has mapped and accessed a page which is not
1282                          * actually RAM. */
1283                         vcpu->arch.paddr_accessed = gpaddr;
1284                         vcpu->arch.vaddr_accessed = eaddr;
1285                         r = kvmppc_emulate_mmio(run, vcpu);
1286                         kvmppc_account_exit(vcpu, MMIO_EXITS);
1287                 }
1288 
1289                 srcu_read_unlock(&vcpu->kvm->srcu, idx);
1290                 break;
1291         }
1292 
1293         case BOOKE_INTERRUPT_ITLB_MISS: {
1294                 unsigned long eaddr = vcpu->arch.regs.nip;
1295                 gpa_t gpaddr;
1296                 gfn_t gfn;
1297                 int gtlb_index;
1298 
1299                 r = RESUME_GUEST;
1300 
1301                 /* Check the guest TLB. */
1302                 gtlb_index = kvmppc_mmu_itlb_index(vcpu, eaddr);
1303                 if (gtlb_index < 0) {
1304                         /* The guest didn't have a mapping for it. */
1305                         kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_ITLB_MISS);
1306                         kvmppc_mmu_itlb_miss(vcpu);
1307                         kvmppc_account_exit(vcpu, ITLB_REAL_MISS_EXITS);
1308                         break;
1309                 }
1310 
1311                 kvmppc_account_exit(vcpu, ITLB_VIRT_MISS_EXITS);
1312 
1313                 idx = srcu_read_lock(&vcpu->kvm->srcu);
1314 
1315                 gpaddr = kvmppc_mmu_xlate(vcpu, gtlb_index, eaddr);
1316                 gfn = gpaddr >> PAGE_SHIFT;
1317 
1318                 if (kvm_is_visible_gfn(vcpu->kvm, gfn)) {
1319                         /* The guest TLB had a mapping, but the shadow TLB
1320                          * didn't. This could be because:
1321                          * a) the entry is mapping the host kernel, or
1322                          * b) the guest used a large mapping which we're faking
1323                          * Either way, we need to satisfy the fault without
1324                          * invoking the guest. */
1325                         kvmppc_mmu_map(vcpu, eaddr, gpaddr, gtlb_index);
1326                 } else {
1327                         /* Guest mapped and leaped at non-RAM! */
1328                         kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_MACHINE_CHECK);
1329                 }
1330 
1331                 srcu_read_unlock(&vcpu->kvm->srcu, idx);
1332                 break;
1333         }
1334 
1335         case BOOKE_INTERRUPT_DEBUG: {
1336                 r = kvmppc_handle_debug(run, vcpu);
1337                 if (r == RESUME_HOST)
1338                         run->exit_reason = KVM_EXIT_DEBUG;
1339                 kvmppc_account_exit(vcpu, DEBUG_EXITS);
1340                 break;
1341         }
1342 
1343         default:
1344                 printk(KERN_EMERG "exit_nr %d\n", exit_nr);
1345                 BUG();
1346         }
1347 
1348 out:
1349         /*
1350          * To avoid clobbering exit_reason, only check for signals if we
1351          * aren't already exiting to userspace for some other reason.
1352          */
1353         if (!(r & RESUME_HOST)) {
1354                 s = kvmppc_prepare_to_enter(vcpu);
1355                 if (s <= 0)
1356                         r = (s << 2) | RESUME_HOST | (r & RESUME_FLAG_NV);
1357                 else {
1358                         /* interrupts now hard-disabled */
1359                         kvmppc_fix_ee_before_entry();
1360                         kvmppc_load_guest_fp(vcpu);
1361                         kvmppc_load_guest_altivec(vcpu);
1362                 }
1363         }
1364 
1365         return r;
1366 }
1367 
1368 static void kvmppc_set_tsr(struct kvm_vcpu *vcpu, u32 new_tsr)
1369 {
1370         u32 old_tsr = vcpu->arch.tsr;
1371 
1372         vcpu->arch.tsr = new_tsr;
1373 
1374         if ((old_tsr ^ vcpu->arch.tsr) & (TSR_ENW | TSR_WIS))
1375                 arm_next_watchdog(vcpu);
1376 
1377         update_timer_ints(vcpu);
1378 }
1379 
1380 /* Initial guest state: 16MB mapping 0 -> 0, PC = 0, MSR = 0, R1 = 16MB */
1381 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
1382 {
1383         int i;
1384         int r;
1385 
1386         vcpu->arch.regs.nip = 0;
1387         vcpu->arch.shared->pir = vcpu->vcpu_id;
1388         kvmppc_set_gpr(vcpu, 1, (16<<20) - 8); /* -8 for the callee-save LR slot */
1389         kvmppc_set_msr(vcpu, 0);
1390 
1391 #ifndef CONFIG_KVM_BOOKE_HV
1392         vcpu->arch.shadow_msr = MSR_USER | MSR_IS | MSR_DS;
1393         vcpu->arch.shadow_pid = 1;
1394         vcpu->arch.shared->msr = 0;
1395 #endif
1396 
1397         /* Eye-catching numbers so we know if the guest takes an interrupt
1398          * before it's programmed its own IVPR/IVORs. */
1399         vcpu->arch.ivpr = 0x55550000;
1400         for (i = 0; i < BOOKE_IRQPRIO_MAX; i++)
1401                 vcpu->arch.ivor[i] = 0x7700 | i * 4;
1402 
1403         kvmppc_init_timing_stats(vcpu);
1404 
1405         r = kvmppc_core_vcpu_setup(vcpu);
1406         kvmppc_sanity_check(vcpu);
1407         return r;
1408 }
1409 
1410 int kvmppc_subarch_vcpu_init(struct kvm_vcpu *vcpu)
1411 {
1412         /* setup watchdog timer once */
1413         spin_lock_init(&vcpu->arch.wdt_lock);
1414         timer_setup(&vcpu->arch.wdt_timer, kvmppc_watchdog_func, 0);
1415 
1416         /*
1417          * Clear DBSR.MRR to avoid guest debug interrupt as
1418          * this is of host interest
1419          */
1420         mtspr(SPRN_DBSR, DBSR_MRR);
1421         return 0;
1422 }
1423 
1424 void kvmppc_subarch_vcpu_uninit(struct kvm_vcpu *vcpu)
1425 {
1426         del_timer_sync(&vcpu->arch.wdt_timer);
1427 }
1428 
1429 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
1430 {
1431         int i;
1432 
1433         vcpu_load(vcpu);
1434 
1435         regs->pc = vcpu->arch.regs.nip;
1436         regs->cr = kvmppc_get_cr(vcpu);
1437         regs->ctr = vcpu->arch.regs.ctr;
1438         regs->lr = vcpu->arch.regs.link;
1439         regs->xer = kvmppc_get_xer(vcpu);
1440         regs->msr = vcpu->arch.shared->msr;
1441         regs->srr0 = kvmppc_get_srr0(vcpu);
1442         regs->srr1 = kvmppc_get_srr1(vcpu);
1443         regs->pid = vcpu->arch.pid;
1444         regs->sprg0 = kvmppc_get_sprg0(vcpu);
1445         regs->sprg1 = kvmppc_get_sprg1(vcpu);
1446         regs->sprg2 = kvmppc_get_sprg2(vcpu);
1447         regs->sprg3 = kvmppc_get_sprg3(vcpu);
1448         regs->sprg4 = kvmppc_get_sprg4(vcpu);
1449         regs->sprg5 = kvmppc_get_sprg5(vcpu);
1450         regs->sprg6 = kvmppc_get_sprg6(vcpu);
1451         regs->sprg7 = kvmppc_get_sprg7(vcpu);
1452 
1453         for (i = 0; i < ARRAY_SIZE(regs->gpr); i++)
1454                 regs->gpr[i] = kvmppc_get_gpr(vcpu, i);
1455 
1456         vcpu_put(vcpu);
1457         return 0;
1458 }
1459 
1460 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
1461 {
1462         int i;
1463 
1464         vcpu_load(vcpu);
1465 
1466         vcpu->arch.regs.nip = regs->pc;
1467         kvmppc_set_cr(vcpu, regs->cr);
1468         vcpu->arch.regs.ctr = regs->ctr;
1469         vcpu->arch.regs.link = regs->lr;
1470         kvmppc_set_xer(vcpu, regs->xer);
1471         kvmppc_set_msr(vcpu, regs->msr);
1472         kvmppc_set_srr0(vcpu, regs->srr0);
1473         kvmppc_set_srr1(vcpu, regs->srr1);
1474         kvmppc_set_pid(vcpu, regs->pid);
1475         kvmppc_set_sprg0(vcpu, regs->sprg0);
1476         kvmppc_set_sprg1(vcpu, regs->sprg1);
1477         kvmppc_set_sprg2(vcpu, regs->sprg2);
1478         kvmppc_set_sprg3(vcpu, regs->sprg3);
1479         kvmppc_set_sprg4(vcpu, regs->sprg4);
1480         kvmppc_set_sprg5(vcpu, regs->sprg5);
1481         kvmppc_set_sprg6(vcpu, regs->sprg6);
1482         kvmppc_set_sprg7(vcpu, regs->sprg7);
1483 
1484         for (i = 0; i < ARRAY_SIZE(regs->gpr); i++)
1485                 kvmppc_set_gpr(vcpu, i, regs->gpr[i]);
1486 
1487         vcpu_put(vcpu);
1488         return 0;
1489 }
1490 
1491 static void get_sregs_base(struct kvm_vcpu *vcpu,
1492                            struct kvm_sregs *sregs)
1493 {
1494         u64 tb = get_tb();
1495 
1496         sregs->u.e.features |= KVM_SREGS_E_BASE;
1497 
1498         sregs->u.e.csrr0 = vcpu->arch.csrr0;
1499         sregs->u.e.csrr1 = vcpu->arch.csrr1;
1500         sregs->u.e.mcsr = vcpu->arch.mcsr;
1501         sregs->u.e.esr = kvmppc_get_esr(vcpu);
1502         sregs->u.e.dear = kvmppc_get_dar(vcpu);
1503         sregs->u.e.tsr = vcpu->arch.tsr;
1504         sregs->u.e.tcr = vcpu->arch.tcr;
1505         sregs->u.e.dec = kvmppc_get_dec(vcpu, tb);
1506         sregs->u.e.tb = tb;
1507         sregs->u.e.vrsave = vcpu->arch.vrsave;
1508 }
1509 
1510 static int set_sregs_base(struct kvm_vcpu *vcpu,
1511                           struct kvm_sregs *sregs)
1512 {
1513         if (!(sregs->u.e.features & KVM_SREGS_E_BASE))
1514                 return 0;
1515 
1516         vcpu->arch.csrr0 = sregs->u.e.csrr0;
1517         vcpu->arch.csrr1 = sregs->u.e.csrr1;
1518         vcpu->arch.mcsr = sregs->u.e.mcsr;
1519         kvmppc_set_esr(vcpu, sregs->u.e.esr);
1520         kvmppc_set_dar(vcpu, sregs->u.e.dear);
1521         vcpu->arch.vrsave = sregs->u.e.vrsave;
1522         kvmppc_set_tcr(vcpu, sregs->u.e.tcr);
1523 
1524         if (sregs->u.e.update_special & KVM_SREGS_E_UPDATE_DEC) {
1525                 vcpu->arch.dec = sregs->u.e.dec;
1526                 kvmppc_emulate_dec(vcpu);
1527         }
1528 
1529         if (sregs->u.e.update_special & KVM_SREGS_E_UPDATE_TSR)
1530                 kvmppc_set_tsr(vcpu, sregs->u.e.tsr);
1531 
1532         return 0;
1533 }
1534 
1535 static void get_sregs_arch206(struct kvm_vcpu *vcpu,
1536                               struct kvm_sregs *sregs)
1537 {
1538         sregs->u.e.features |= KVM_SREGS_E_ARCH206;
1539 
1540         sregs->u.e.pir = vcpu->vcpu_id;
1541         sregs->u.e.mcsrr0 = vcpu->arch.mcsrr0;
1542         sregs->u.e.mcsrr1 = vcpu->arch.mcsrr1;
1543         sregs->u.e.decar = vcpu->arch.decar;
1544         sregs->u.e.ivpr = vcpu->arch.ivpr;
1545 }
1546 
1547 static int set_sregs_arch206(struct kvm_vcpu *vcpu,
1548                              struct kvm_sregs *sregs)
1549 {
1550         if (!(sregs->u.e.features & KVM_SREGS_E_ARCH206))
1551                 return 0;
1552 
1553         if (sregs->u.e.pir != vcpu->vcpu_id)
1554                 return -EINVAL;
1555 
1556         vcpu->arch.mcsrr0 = sregs->u.e.mcsrr0;
1557         vcpu->arch.mcsrr1 = sregs->u.e.mcsrr1;
1558         vcpu->arch.decar = sregs->u.e.decar;
1559         vcpu->arch.ivpr = sregs->u.e.ivpr;
1560 
1561         return 0;
1562 }
1563 
1564 int kvmppc_get_sregs_ivor(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
1565 {
1566         sregs->u.e.features |= KVM_SREGS_E_IVOR;
1567 
1568         sregs->u.e.ivor_low[0] = vcpu->arch.ivor[BOOKE_IRQPRIO_CRITICAL];
1569         sregs->u.e.ivor_low[1] = vcpu->arch.ivor[BOOKE_IRQPRIO_MACHINE_CHECK];
1570         sregs->u.e.ivor_low[2] = vcpu->arch.ivor[BOOKE_IRQPRIO_DATA_STORAGE];
1571         sregs->u.e.ivor_low[3] = vcpu->arch.ivor[BOOKE_IRQPRIO_INST_STORAGE];
1572         sregs->u.e.ivor_low[4] = vcpu->arch.ivor[BOOKE_IRQPRIO_EXTERNAL];
1573         sregs->u.e.ivor_low[5] = vcpu->arch.ivor[BOOKE_IRQPRIO_ALIGNMENT];
1574         sregs->u.e.ivor_low[6] = vcpu->arch.ivor[BOOKE_IRQPRIO_PROGRAM];
1575         sregs->u.e.ivor_low[7] = vcpu->arch.ivor[BOOKE_IRQPRIO_FP_UNAVAIL];
1576         sregs->u.e.ivor_low[8] = vcpu->arch.ivor[BOOKE_IRQPRIO_SYSCALL];
1577         sregs->u.e.ivor_low[9] = vcpu->arch.ivor[BOOKE_IRQPRIO_AP_UNAVAIL];
1578         sregs->u.e.ivor_low[10] = vcpu->arch.ivor[BOOKE_IRQPRIO_DECREMENTER];
1579         sregs->u.e.ivor_low[11] = vcpu->arch.ivor[BOOKE_IRQPRIO_FIT];
1580         sregs->u.e.ivor_low[12] = vcpu->arch.ivor[BOOKE_IRQPRIO_WATCHDOG];
1581         sregs->u.e.ivor_low[13] = vcpu->arch.ivor[BOOKE_IRQPRIO_DTLB_MISS];
1582         sregs->u.e.ivor_low[14] = vcpu->arch.ivor[BOOKE_IRQPRIO_ITLB_MISS];
1583         sregs->u.e.ivor_low[15] = vcpu->arch.ivor[BOOKE_IRQPRIO_DEBUG];
1584         return 0;
1585 }
1586 
1587 int kvmppc_set_sregs_ivor(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
1588 {
1589         if (!(sregs->u.e.features & KVM_SREGS_E_IVOR))
1590                 return 0;
1591 
1592         vcpu->arch.ivor[BOOKE_IRQPRIO_CRITICAL] = sregs->u.e.ivor_low[0];
1593         vcpu->arch.ivor[BOOKE_IRQPRIO_MACHINE_CHECK] = sregs->u.e.ivor_low[1];
1594         vcpu->arch.ivor[BOOKE_IRQPRIO_DATA_STORAGE] = sregs->u.e.ivor_low[2];
1595         vcpu->arch.ivor[BOOKE_IRQPRIO_INST_STORAGE] = sregs->u.e.ivor_low[3];
1596         vcpu->arch.ivor[BOOKE_IRQPRIO_EXTERNAL] = sregs->u.e.ivor_low[4];
1597         vcpu->arch.ivor[BOOKE_IRQPRIO_ALIGNMENT] = sregs->u.e.ivor_low[5];
1598         vcpu->arch.ivor[BOOKE_IRQPRIO_PROGRAM] = sregs->u.e.ivor_low[6];
1599         vcpu->arch.ivor[BOOKE_IRQPRIO_FP_UNAVAIL] = sregs->u.e.ivor_low[7];
1600         vcpu->arch.ivor[BOOKE_IRQPRIO_SYSCALL] = sregs->u.e.ivor_low[8];
1601         vcpu->arch.ivor[BOOKE_IRQPRIO_AP_UNAVAIL] = sregs->u.e.ivor_low[9];
1602         vcpu->arch.ivor[BOOKE_IRQPRIO_DECREMENTER] = sregs->u.e.ivor_low[10];
1603         vcpu->arch.ivor[BOOKE_IRQPRIO_FIT] = sregs->u.e.ivor_low[11];
1604         vcpu->arch.ivor[BOOKE_IRQPRIO_WATCHDOG] = sregs->u.e.ivor_low[12];
1605         vcpu->arch.ivor[BOOKE_IRQPRIO_DTLB_MISS] = sregs->u.e.ivor_low[13];
1606         vcpu->arch.ivor[BOOKE_IRQPRIO_ITLB_MISS] = sregs->u.e.ivor_low[14];
1607         vcpu->arch.ivor[BOOKE_IRQPRIO_DEBUG] = sregs->u.e.ivor_low[15];
1608 
1609         return 0;
1610 }
1611 
1612 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
1613                                   struct kvm_sregs *sregs)
1614 {
1615         int ret;
1616 
1617         vcpu_load(vcpu);
1618 
1619         sregs->pvr = vcpu->arch.pvr;
1620 
1621         get_sregs_base(vcpu, sregs);
1622         get_sregs_arch206(vcpu, sregs);
1623         ret = vcpu->kvm->arch.kvm_ops->get_sregs(vcpu, sregs);
1624 
1625         vcpu_put(vcpu);
1626         return ret;
1627 }
1628 
1629 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
1630                                   struct kvm_sregs *sregs)
1631 {
1632         int ret = -EINVAL;
1633 
1634         vcpu_load(vcpu);
1635         if (vcpu->arch.pvr != sregs->pvr)
1636                 goto out;
1637 
1638         ret = set_sregs_base(vcpu, sregs);
1639         if (ret < 0)
1640                 goto out;
1641 
1642         ret = set_sregs_arch206(vcpu, sregs);
1643         if (ret < 0)
1644                 goto out;
1645 
1646         ret = vcpu->kvm->arch.kvm_ops->set_sregs(vcpu, sregs);
1647 
1648 out:
1649         vcpu_put(vcpu);
1650         return ret;
1651 }
1652 
1653 int kvmppc_get_one_reg(struct kvm_vcpu *vcpu, u64 id,
1654                         union kvmppc_one_reg *val)
1655 {
1656         int r = 0;
1657 
1658         switch (id) {
1659         case KVM_REG_PPC_IAC1:
1660                 *val = get_reg_val(id, vcpu->arch.dbg_reg.iac1);
1661                 break;
1662         case KVM_REG_PPC_IAC2:
1663                 *val = get_reg_val(id, vcpu->arch.dbg_reg.iac2);
1664                 break;
1665 #if CONFIG_PPC_ADV_DEBUG_IACS > 2
1666         case KVM_REG_PPC_IAC3:
1667                 *val = get_reg_val(id, vcpu->arch.dbg_reg.iac3);
1668                 break;
1669         case KVM_REG_PPC_IAC4:
1670                 *val = get_reg_val(id, vcpu->arch.dbg_reg.iac4);
1671                 break;
1672 #endif
1673         case KVM_REG_PPC_DAC1:
1674                 *val = get_reg_val(id, vcpu->arch.dbg_reg.dac1);
1675                 break;
1676         case KVM_REG_PPC_DAC2:
1677                 *val = get_reg_val(id, vcpu->arch.dbg_reg.dac2);
1678                 break;
1679         case KVM_REG_PPC_EPR: {
1680                 u32 epr = kvmppc_get_epr(vcpu);
1681                 *val = get_reg_val(id, epr);
1682                 break;
1683         }
1684 #if defined(CONFIG_64BIT)
1685         case KVM_REG_PPC_EPCR:
1686                 *val = get_reg_val(id, vcpu->arch.epcr);
1687                 break;
1688 #endif
1689         case KVM_REG_PPC_TCR:
1690                 *val = get_reg_val(id, vcpu->arch.tcr);
1691                 break;
1692         case KVM_REG_PPC_TSR:
1693                 *val = get_reg_val(id, vcpu->arch.tsr);
1694                 break;
1695         case KVM_REG_PPC_DEBUG_INST:
1696                 *val = get_reg_val(id, KVMPPC_INST_SW_BREAKPOINT);
1697                 break;
1698         case KVM_REG_PPC_VRSAVE:
1699                 *val = get_reg_val(id, vcpu->arch.vrsave);
1700                 break;
1701         default:
1702                 r = vcpu->kvm->arch.kvm_ops->get_one_reg(vcpu, id, val);
1703                 break;
1704         }
1705 
1706         return r;
1707 }
1708 
1709 int kvmppc_set_one_reg(struct kvm_vcpu *vcpu, u64 id,
1710                         union kvmppc_one_reg *val)
1711 {
1712         int r = 0;
1713 
1714         switch (id) {
1715         case KVM_REG_PPC_IAC1:
1716                 vcpu->arch.dbg_reg.iac1 = set_reg_val(id, *val);
1717                 break;
1718         case KVM_REG_PPC_IAC2:
1719                 vcpu->arch.dbg_reg.iac2 = set_reg_val(id, *val);
1720                 break;
1721 #if CONFIG_PPC_ADV_DEBUG_IACS > 2
1722         case KVM_REG_PPC_IAC3:
1723                 vcpu->arch.dbg_reg.iac3 = set_reg_val(id, *val);
1724                 break;
1725         case KVM_REG_PPC_IAC4:
1726                 vcpu->arch.dbg_reg.iac4 = set_reg_val(id, *val);
1727                 break;
1728 #endif
1729         case KVM_REG_PPC_DAC1:
1730                 vcpu->arch.dbg_reg.dac1 = set_reg_val(id, *val);
1731                 break;
1732         case KVM_REG_PPC_DAC2:
1733                 vcpu->arch.dbg_reg.dac2 = set_reg_val(id, *val);
1734                 break;
1735         case KVM_REG_PPC_EPR: {
1736                 u32 new_epr = set_reg_val(id, *val);
1737                 kvmppc_set_epr(vcpu, new_epr);
1738                 break;
1739         }
1740 #if defined(CONFIG_64BIT)
1741         case KVM_REG_PPC_EPCR: {
1742                 u32 new_epcr = set_reg_val(id, *val);
1743                 kvmppc_set_epcr(vcpu, new_epcr);
1744                 break;
1745         }
1746 #endif
1747         case KVM_REG_PPC_OR_TSR: {
1748                 u32 tsr_bits = set_reg_val(id, *val);
1749                 kvmppc_set_tsr_bits(vcpu, tsr_bits);
1750                 break;
1751         }
1752         case KVM_REG_PPC_CLEAR_TSR: {
1753                 u32 tsr_bits = set_reg_val(id, *val);
1754                 kvmppc_clr_tsr_bits(vcpu, tsr_bits);
1755                 break;
1756         }
1757         case KVM_REG_PPC_TSR: {
1758                 u32 tsr = set_reg_val(id, *val);
1759                 kvmppc_set_tsr(vcpu, tsr);
1760                 break;
1761         }
1762         case KVM_REG_PPC_TCR: {
1763                 u32 tcr = set_reg_val(id, *val);
1764                 kvmppc_set_tcr(vcpu, tcr);
1765                 break;
1766         }
1767         case KVM_REG_PPC_VRSAVE:
1768                 vcpu->arch.vrsave = set_reg_val(id, *val);
1769                 break;
1770         default:
1771                 r = vcpu->kvm->arch.kvm_ops->set_one_reg(vcpu, id, val);
1772                 break;
1773         }
1774 
1775         return r;
1776 }
1777 
1778 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
1779 {
1780         return -ENOTSUPP;
1781 }
1782 
1783 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
1784 {
1785         return -ENOTSUPP;
1786 }
1787 
1788 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
1789                                   struct kvm_translation *tr)
1790 {
1791         int r;
1792 
1793         vcpu_load(vcpu);
1794         r = kvmppc_core_vcpu_translate(vcpu, tr);
1795         vcpu_put(vcpu);
1796         return r;
1797 }
1798 
1799 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
1800 {
1801         return -ENOTSUPP;
1802 }
1803 
1804 void kvmppc_core_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
1805                               struct kvm_memory_slot *dont)
1806 {
1807 }
1808 
1809 int kvmppc_core_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
1810                                unsigned long npages)
1811 {
1812         return 0;
1813 }
1814 
1815 int kvmppc_core_prepare_memory_region(struct kvm *kvm,
1816                                       struct kvm_memory_slot *memslot,
1817                                       const struct kvm_userspace_memory_region *mem)
1818 {
1819         return 0;
1820 }
1821 
1822 void kvmppc_core_commit_memory_region(struct kvm *kvm,
1823                                 const struct kvm_userspace_memory_region *mem,
1824                                 const struct kvm_memory_slot *old,
1825                                 const struct kvm_memory_slot *new,
1826                                 enum kvm_mr_change change)
1827 {
1828 }
1829 
1830 void kvmppc_core_flush_memslot(struct kvm *kvm, struct kvm_memory_slot *memslot)
1831 {
1832 }
1833 
1834 void kvmppc_set_epcr(struct kvm_vcpu *vcpu, u32 new_epcr)
1835 {
1836 #if defined(CONFIG_64BIT)
1837         vcpu->arch.epcr = new_epcr;
1838 #ifdef CONFIG_KVM_BOOKE_HV
1839         vcpu->arch.shadow_epcr &= ~SPRN_EPCR_GICM;
1840         if (vcpu->arch.epcr  & SPRN_EPCR_ICM)
1841                 vcpu->arch.shadow_epcr |= SPRN_EPCR_GICM;
1842 #endif
1843 #endif
1844 }
1845 
1846 void kvmppc_set_tcr(struct kvm_vcpu *vcpu, u32 new_tcr)
1847 {
1848         vcpu->arch.tcr = new_tcr;
1849         arm_next_watchdog(vcpu);
1850         update_timer_ints(vcpu);
1851 }
1852 
1853 void kvmppc_set_tsr_bits(struct kvm_vcpu *vcpu, u32 tsr_bits)
1854 {
1855         set_bits(tsr_bits, &vcpu->arch.tsr);
1856         smp_wmb();
1857         kvm_make_request(KVM_REQ_PENDING_TIMER, vcpu);
1858         kvm_vcpu_kick(vcpu);
1859 }
1860 
1861 void kvmppc_clr_tsr_bits(struct kvm_vcpu *vcpu, u32 tsr_bits)
1862 {
1863         clear_bits(tsr_bits, &vcpu->arch.tsr);
1864 
1865         /*
1866          * We may have stopped the watchdog due to
1867          * being stuck on final expiration.
1868          */
1869         if (tsr_bits & (TSR_ENW | TSR_WIS))
1870                 arm_next_watchdog(vcpu);
1871 
1872         update_timer_ints(vcpu);
1873 }
1874 
1875 void kvmppc_decrementer_func(struct kvm_vcpu *vcpu)
1876 {
1877         if (vcpu->arch.tcr & TCR_ARE) {
1878                 vcpu->arch.dec = vcpu->arch.decar;
1879                 kvmppc_emulate_dec(vcpu);
1880         }
1881 
1882         kvmppc_set_tsr_bits(vcpu, TSR_DIS);
1883 }
1884 
1885 static int kvmppc_booke_add_breakpoint(struct debug_reg *dbg_reg,
1886                                        uint64_t addr, int index)
1887 {
1888         switch (index) {
1889         case 0:
1890                 dbg_reg->dbcr0 |= DBCR0_IAC1;
1891                 dbg_reg->iac1 = addr;
1892                 break;
1893         case 1:
1894                 dbg_reg->dbcr0 |= DBCR0_IAC2;
1895                 dbg_reg->iac2 = addr;
1896                 break;
1897 #if CONFIG_PPC_ADV_DEBUG_IACS > 2
1898         case 2:
1899                 dbg_reg->dbcr0 |= DBCR0_IAC3;
1900                 dbg_reg->iac3 = addr;
1901                 break;
1902         case 3:
1903                 dbg_reg->dbcr0 |= DBCR0_IAC4;
1904                 dbg_reg->iac4 = addr;
1905                 break;
1906 #endif
1907         default:
1908                 return -EINVAL;
1909         }
1910 
1911         dbg_reg->dbcr0 |= DBCR0_IDM;
1912         return 0;
1913 }
1914 
1915 static int kvmppc_booke_add_watchpoint(struct debug_reg *dbg_reg, uint64_t addr,
1916                                        int type, int index)
1917 {
1918         switch (index) {
1919         case 0:
1920                 if (type & KVMPPC_DEBUG_WATCH_READ)
1921                         dbg_reg->dbcr0 |= DBCR0_DAC1R;
1922                 if (type & KVMPPC_DEBUG_WATCH_WRITE)
1923                         dbg_reg->dbcr0 |= DBCR0_DAC1W;
1924                 dbg_reg->dac1 = addr;
1925                 break;
1926         case 1:
1927                 if (type & KVMPPC_DEBUG_WATCH_READ)
1928                         dbg_reg->dbcr0 |= DBCR0_DAC2R;
1929                 if (type & KVMPPC_DEBUG_WATCH_WRITE)
1930                         dbg_reg->dbcr0 |= DBCR0_DAC2W;
1931                 dbg_reg->dac2 = addr;
1932                 break;
1933         default:
1934                 return -EINVAL;
1935         }
1936 
1937         dbg_reg->dbcr0 |= DBCR0_IDM;
1938         return 0;
1939 }
1940 void kvm_guest_protect_msr(struct kvm_vcpu *vcpu, ulong prot_bitmap, bool set)
1941 {
1942         /* XXX: Add similar MSR protection for BookE-PR */
1943 #ifdef CONFIG_KVM_BOOKE_HV
1944         BUG_ON(prot_bitmap & ~(MSRP_UCLEP | MSRP_DEP | MSRP_PMMP));
1945         if (set) {
1946                 if (prot_bitmap & MSR_UCLE)
1947                         vcpu->arch.shadow_msrp |= MSRP_UCLEP;
1948                 if (prot_bitmap & MSR_DE)
1949                         vcpu->arch.shadow_msrp |= MSRP_DEP;
1950                 if (prot_bitmap & MSR_PMM)
1951                         vcpu->arch.shadow_msrp |= MSRP_PMMP;
1952         } else {
1953                 if (prot_bitmap & MSR_UCLE)
1954                         vcpu->arch.shadow_msrp &= ~MSRP_UCLEP;
1955                 if (prot_bitmap & MSR_DE)
1956                         vcpu->arch.shadow_msrp &= ~MSRP_DEP;
1957                 if (prot_bitmap & MSR_PMM)
1958                         vcpu->arch.shadow_msrp &= ~MSRP_PMMP;
1959         }
1960 #endif
1961 }
1962 
1963 int kvmppc_xlate(struct kvm_vcpu *vcpu, ulong eaddr, enum xlate_instdata xlid,
1964                  enum xlate_readwrite xlrw, struct kvmppc_pte *pte)
1965 {
1966         int gtlb_index;
1967         gpa_t gpaddr;
1968 
1969 #ifdef CONFIG_KVM_E500V2
1970         if (!(vcpu->arch.shared->msr & MSR_PR) &&
1971             (eaddr & PAGE_MASK) == vcpu->arch.magic_page_ea) {
1972                 pte->eaddr = eaddr;
1973                 pte->raddr = (vcpu->arch.magic_page_pa & PAGE_MASK) |
1974                              (eaddr & ~PAGE_MASK);
1975                 pte->vpage = eaddr >> PAGE_SHIFT;
1976                 pte->may_read = true;
1977                 pte->may_write = true;
1978                 pte->may_execute = true;
1979 
1980                 return 0;
1981         }
1982 #endif
1983 
1984         /* Check the guest TLB. */
1985         switch (xlid) {
1986         case XLATE_INST:
1987                 gtlb_index = kvmppc_mmu_itlb_index(vcpu, eaddr);
1988                 break;
1989         case XLATE_DATA:
1990                 gtlb_index = kvmppc_mmu_dtlb_index(vcpu, eaddr);
1991                 break;
1992         default:
1993                 BUG();
1994         }
1995 
1996         /* Do we have a TLB entry at all? */
1997         if (gtlb_index < 0)
1998                 return -ENOENT;
1999 
2000         gpaddr = kvmppc_mmu_xlate(vcpu, gtlb_index, eaddr);
2001 
2002         pte->eaddr = eaddr;
2003         pte->raddr = (gpaddr & PAGE_MASK) | (eaddr & ~PAGE_MASK);
2004         pte->vpage = eaddr >> PAGE_SHIFT;
2005 
2006         /* XXX read permissions from the guest TLB */
2007         pte->may_read = true;
2008         pte->may_write = true;
2009         pte->may_execute = true;
2010 
2011         return 0;
2012 }
2013 
2014 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
2015                                          struct kvm_guest_debug *dbg)
2016 {
2017         struct debug_reg *dbg_reg;
2018         int n, b = 0, w = 0;
2019         int ret = 0;
2020 
2021         vcpu_load(vcpu);
2022 
2023         if (!(dbg->control & KVM_GUESTDBG_ENABLE)) {
2024                 vcpu->arch.dbg_reg.dbcr0 = 0;
2025                 vcpu->guest_debug = 0;
2026                 kvm_guest_protect_msr(vcpu, MSR_DE, false);
2027                 goto out;
2028         }
2029 
2030         kvm_guest_protect_msr(vcpu, MSR_DE, true);
2031         vcpu->guest_debug = dbg->control;
2032         vcpu->arch.dbg_reg.dbcr0 = 0;
2033 
2034         if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
2035                 vcpu->arch.dbg_reg.dbcr0 |= DBCR0_IDM | DBCR0_IC;
2036 
2037         /* Code below handles only HW breakpoints */
2038         dbg_reg = &(vcpu->arch.dbg_reg);
2039 
2040 #ifdef CONFIG_KVM_BOOKE_HV
2041         /*
2042          * On BookE-HV (e500mc) the guest is always executed with MSR.GS=1
2043          * DBCR1 and DBCR2 are set to trigger debug events when MSR.PR is 0
2044          */
2045         dbg_reg->dbcr1 = 0;
2046         dbg_reg->dbcr2 = 0;
2047 #else
2048         /*
2049          * On BookE-PR (e500v2) the guest is always executed with MSR.PR=1
2050          * We set DBCR1 and DBCR2 to only trigger debug events when MSR.PR
2051          * is set.
2052          */
2053         dbg_reg->dbcr1 = DBCR1_IAC1US | DBCR1_IAC2US | DBCR1_IAC3US |
2054                           DBCR1_IAC4US;
2055         dbg_reg->dbcr2 = DBCR2_DAC1US | DBCR2_DAC2US;
2056 #endif
2057 
2058         if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP))
2059                 goto out;
2060 
2061         ret = -EINVAL;
2062         for (n = 0; n < (KVMPPC_BOOKE_IAC_NUM + KVMPPC_BOOKE_DAC_NUM); n++) {
2063                 uint64_t addr = dbg->arch.bp[n].addr;
2064                 uint32_t type = dbg->arch.bp[n].type;
2065 
2066                 if (type == KVMPPC_DEBUG_NONE)
2067                         continue;
2068 
2069                 if (type & ~(KVMPPC_DEBUG_WATCH_READ |
2070                              KVMPPC_DEBUG_WATCH_WRITE |
2071                              KVMPPC_DEBUG_BREAKPOINT))
2072                         goto out;
2073 
2074                 if (type & KVMPPC_DEBUG_BREAKPOINT) {
2075                         /* Setting H/W breakpoint */
2076                         if (kvmppc_booke_add_breakpoint(dbg_reg, addr, b++))
2077                                 goto out;
2078                 } else {
2079                         /* Setting H/W watchpoint */
2080                         if (kvmppc_booke_add_watchpoint(dbg_reg, addr,
2081                                                         type, w++))
2082                                 goto out;
2083                 }
2084         }
2085 
2086         ret = 0;
2087 out:
2088         vcpu_put(vcpu);
2089         return ret;
2090 }
2091 
2092 void kvmppc_booke_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
2093 {
2094         vcpu->cpu = smp_processor_id();
2095         current->thread.kvm_vcpu = vcpu;
2096 }
2097 
2098 void kvmppc_booke_vcpu_put(struct kvm_vcpu *vcpu)
2099 {
2100         current->thread.kvm_vcpu = NULL;
2101         vcpu->cpu = -1;
2102 
2103         /* Clear pending debug event in DBSR */
2104         kvmppc_clear_dbsr();
2105 }
2106 
2107 void kvmppc_mmu_destroy(struct kvm_vcpu *vcpu)
2108 {
2109         vcpu->kvm->arch.kvm_ops->mmu_destroy(vcpu);
2110 }
2111 
2112 int kvmppc_core_init_vm(struct kvm *kvm)
2113 {
2114         return kvm->arch.kvm_ops->init_vm(kvm);
2115 }
2116 
2117 struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
2118 {
2119         return kvm->arch.kvm_ops->vcpu_create(kvm, id);
2120 }
2121 
2122 void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
2123 {
2124         vcpu->kvm->arch.kvm_ops->vcpu_free(vcpu);
2125 }
2126 
2127 void kvmppc_core_destroy_vm(struct kvm *kvm)
2128 {
2129         kvm->arch.kvm_ops->destroy_vm(kvm);
2130 }
2131 
2132 void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
2133 {
2134         vcpu->kvm->arch.kvm_ops->vcpu_load(vcpu, cpu);
2135 }
2136 
2137 void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
2138 {
2139         vcpu->kvm->arch.kvm_ops->vcpu_put(vcpu);
2140 }
2141 
2142 int __init kvmppc_booke_init(void)
2143 {
2144 #ifndef CONFIG_KVM_BOOKE_HV
2145         unsigned long ivor[16];
2146         unsigned long *handler = kvmppc_booke_handler_addr;
2147         unsigned long max_ivor = 0;
2148         unsigned long handler_len;
2149         int i;
2150 
2151         /* We install our own exception handlers by hijacking IVPR. IVPR must
2152          * be 16-bit aligned, so we need a 64KB allocation. */
2153         kvmppc_booke_handlers = __get_free_pages(GFP_KERNEL | __GFP_ZERO,
2154                                                  VCPU_SIZE_ORDER);
2155         if (!kvmppc_booke_handlers)
2156                 return -ENOMEM;
2157 
2158         /* XXX make sure our handlers are smaller than Linux's */
2159 
2160         /* Copy our interrupt handlers to match host IVORs. That way we don't
2161          * have to swap the IVORs on every guest/host transition. */
2162         ivor[0] = mfspr(SPRN_IVOR0);
2163         ivor[1] = mfspr(SPRN_IVOR1);
2164         ivor[2] = mfspr(SPRN_IVOR2);
2165         ivor[3] = mfspr(SPRN_IVOR3);
2166         ivor[4] = mfspr(SPRN_IVOR4);
2167         ivor[5] = mfspr(SPRN_IVOR5);
2168         ivor[6] = mfspr(SPRN_IVOR6);
2169         ivor[7] = mfspr(SPRN_IVOR7);
2170         ivor[8] = mfspr(SPRN_IVOR8);
2171         ivor[9] = mfspr(SPRN_IVOR9);
2172         ivor[10] = mfspr(SPRN_IVOR10);
2173         ivor[11] = mfspr(SPRN_IVOR11);
2174         ivor[12] = mfspr(SPRN_IVOR12);
2175         ivor[13] = mfspr(SPRN_IVOR13);
2176         ivor[14] = mfspr(SPRN_IVOR14);
2177         ivor[15] = mfspr(SPRN_IVOR15);
2178 
2179         for (i = 0; i < 16; i++) {
2180                 if (ivor[i] > max_ivor)
2181                         max_ivor = i;
2182 
2183                 handler_len = handler[i + 1] - handler[i];
2184                 memcpy((void *)kvmppc_booke_handlers + ivor[i],
2185                        (void *)handler[i], handler_len);
2186         }
2187 
2188         handler_len = handler[max_ivor + 1] - handler[max_ivor];
2189         flush_icache_range(kvmppc_booke_handlers, kvmppc_booke_handlers +
2190                            ivor[max_ivor] + handler_len);
2191 #endif /* !BOOKE_HV */
2192         return 0;
2193 }
2194 
2195 void __exit kvmppc_booke_exit(void)
2196 {
2197         free_pages(kvmppc_booke_handlers, VCPU_SIZE_ORDER);
2198         kvm_exit();
2199 }
2200 

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