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Linux/arch/powerpc/kvm/e500.c

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  1 /*
  2  * Copyright (C) 2008-2011 Freescale Semiconductor, Inc. All rights reserved.
  3  *
  4  * Author: Yu Liu, <yu.liu@freescale.com>
  5  *
  6  * Description:
  7  * This file is derived from arch/powerpc/kvm/44x.c,
  8  * by Hollis Blanchard <hollisb@us.ibm.com>.
  9  *
 10  * This program is free software; you can redistribute it and/or modify
 11  * it under the terms of the GNU General Public License, version 2, as
 12  * published by the Free Software Foundation.
 13  */
 14 
 15 #include <linux/kvm_host.h>
 16 #include <linux/slab.h>
 17 #include <linux/err.h>
 18 #include <linux/export.h>
 19 #include <linux/module.h>
 20 #include <linux/miscdevice.h>
 21 
 22 #include <asm/reg.h>
 23 #include <asm/cputable.h>
 24 #include <asm/tlbflush.h>
 25 #include <asm/kvm_ppc.h>
 26 
 27 #include "../mm/mmu_decl.h"
 28 #include "booke.h"
 29 #include "e500.h"
 30 
 31 struct id {
 32         unsigned long val;
 33         struct id **pentry;
 34 };
 35 
 36 #define NUM_TIDS 256
 37 
 38 /*
 39  * This table provide mappings from:
 40  * (guestAS,guestTID,guestPR) --> ID of physical cpu
 41  * guestAS      [0..1]
 42  * guestTID     [0..255]
 43  * guestPR      [0..1]
 44  * ID           [1..255]
 45  * Each vcpu keeps one vcpu_id_table.
 46  */
 47 struct vcpu_id_table {
 48         struct id id[2][NUM_TIDS][2];
 49 };
 50 
 51 /*
 52  * This table provide reversed mappings of vcpu_id_table:
 53  * ID --> address of vcpu_id_table item.
 54  * Each physical core has one pcpu_id_table.
 55  */
 56 struct pcpu_id_table {
 57         struct id *entry[NUM_TIDS];
 58 };
 59 
 60 static DEFINE_PER_CPU(struct pcpu_id_table, pcpu_sids);
 61 
 62 /* This variable keeps last used shadow ID on local core.
 63  * The valid range of shadow ID is [1..255] */
 64 static DEFINE_PER_CPU(unsigned long, pcpu_last_used_sid);
 65 
 66 /*
 67  * Allocate a free shadow id and setup a valid sid mapping in given entry.
 68  * A mapping is only valid when vcpu_id_table and pcpu_id_table are match.
 69  *
 70  * The caller must have preemption disabled, and keep it that way until
 71  * it has finished with the returned shadow id (either written into the
 72  * TLB or arch.shadow_pid, or discarded).
 73  */
 74 static inline int local_sid_setup_one(struct id *entry)
 75 {
 76         unsigned long sid;
 77         int ret = -1;
 78 
 79         sid = ++(__get_cpu_var(pcpu_last_used_sid));
 80         if (sid < NUM_TIDS) {
 81                 __get_cpu_var(pcpu_sids).entry[sid] = entry;
 82                 entry->val = sid;
 83                 entry->pentry = &__get_cpu_var(pcpu_sids).entry[sid];
 84                 ret = sid;
 85         }
 86 
 87         /*
 88          * If sid == NUM_TIDS, we've run out of sids.  We return -1, and
 89          * the caller will invalidate everything and start over.
 90          *
 91          * sid > NUM_TIDS indicates a race, which we disable preemption to
 92          * avoid.
 93          */
 94         WARN_ON(sid > NUM_TIDS);
 95 
 96         return ret;
 97 }
 98 
 99 /*
100  * Check if given entry contain a valid shadow id mapping.
101  * An ID mapping is considered valid only if
102  * both vcpu and pcpu know this mapping.
103  *
104  * The caller must have preemption disabled, and keep it that way until
105  * it has finished with the returned shadow id (either written into the
106  * TLB or arch.shadow_pid, or discarded).
107  */
108 static inline int local_sid_lookup(struct id *entry)
109 {
110         if (entry && entry->val != 0 &&
111             __get_cpu_var(pcpu_sids).entry[entry->val] == entry &&
112             entry->pentry == &__get_cpu_var(pcpu_sids).entry[entry->val])
113                 return entry->val;
114         return -1;
115 }
116 
117 /* Invalidate all id mappings on local core -- call with preempt disabled */
118 static inline void local_sid_destroy_all(void)
119 {
120         __get_cpu_var(pcpu_last_used_sid) = 0;
121         memset(&__get_cpu_var(pcpu_sids), 0, sizeof(__get_cpu_var(pcpu_sids)));
122 }
123 
124 static void *kvmppc_e500_id_table_alloc(struct kvmppc_vcpu_e500 *vcpu_e500)
125 {
126         vcpu_e500->idt = kzalloc(sizeof(struct vcpu_id_table), GFP_KERNEL);
127         return vcpu_e500->idt;
128 }
129 
130 static void kvmppc_e500_id_table_free(struct kvmppc_vcpu_e500 *vcpu_e500)
131 {
132         kfree(vcpu_e500->idt);
133         vcpu_e500->idt = NULL;
134 }
135 
136 /* Map guest pid to shadow.
137  * We use PID to keep shadow of current guest non-zero PID,
138  * and use PID1 to keep shadow of guest zero PID.
139  * So that guest tlbe with TID=0 can be accessed at any time */
140 static void kvmppc_e500_recalc_shadow_pid(struct kvmppc_vcpu_e500 *vcpu_e500)
141 {
142         preempt_disable();
143         vcpu_e500->vcpu.arch.shadow_pid = kvmppc_e500_get_sid(vcpu_e500,
144                         get_cur_as(&vcpu_e500->vcpu),
145                         get_cur_pid(&vcpu_e500->vcpu),
146                         get_cur_pr(&vcpu_e500->vcpu), 1);
147         vcpu_e500->vcpu.arch.shadow_pid1 = kvmppc_e500_get_sid(vcpu_e500,
148                         get_cur_as(&vcpu_e500->vcpu), 0,
149                         get_cur_pr(&vcpu_e500->vcpu), 1);
150         preempt_enable();
151 }
152 
153 /* Invalidate all mappings on vcpu */
154 static void kvmppc_e500_id_table_reset_all(struct kvmppc_vcpu_e500 *vcpu_e500)
155 {
156         memset(vcpu_e500->idt, 0, sizeof(struct vcpu_id_table));
157 
158         /* Update shadow pid when mappings are changed */
159         kvmppc_e500_recalc_shadow_pid(vcpu_e500);
160 }
161 
162 /* Invalidate one ID mapping on vcpu */
163 static inline void kvmppc_e500_id_table_reset_one(
164                                struct kvmppc_vcpu_e500 *vcpu_e500,
165                                int as, int pid, int pr)
166 {
167         struct vcpu_id_table *idt = vcpu_e500->idt;
168 
169         BUG_ON(as >= 2);
170         BUG_ON(pid >= NUM_TIDS);
171         BUG_ON(pr >= 2);
172 
173         idt->id[as][pid][pr].val = 0;
174         idt->id[as][pid][pr].pentry = NULL;
175 
176         /* Update shadow pid when mappings are changed */
177         kvmppc_e500_recalc_shadow_pid(vcpu_e500);
178 }
179 
180 /*
181  * Map guest (vcpu,AS,ID,PR) to physical core shadow id.
182  * This function first lookup if a valid mapping exists,
183  * if not, then creates a new one.
184  *
185  * The caller must have preemption disabled, and keep it that way until
186  * it has finished with the returned shadow id (either written into the
187  * TLB or arch.shadow_pid, or discarded).
188  */
189 unsigned int kvmppc_e500_get_sid(struct kvmppc_vcpu_e500 *vcpu_e500,
190                                  unsigned int as, unsigned int gid,
191                                  unsigned int pr, int avoid_recursion)
192 {
193         struct vcpu_id_table *idt = vcpu_e500->idt;
194         int sid;
195 
196         BUG_ON(as >= 2);
197         BUG_ON(gid >= NUM_TIDS);
198         BUG_ON(pr >= 2);
199 
200         sid = local_sid_lookup(&idt->id[as][gid][pr]);
201 
202         while (sid <= 0) {
203                 /* No mapping yet */
204                 sid = local_sid_setup_one(&idt->id[as][gid][pr]);
205                 if (sid <= 0) {
206                         _tlbil_all();
207                         local_sid_destroy_all();
208                 }
209 
210                 /* Update shadow pid when mappings are changed */
211                 if (!avoid_recursion)
212                         kvmppc_e500_recalc_shadow_pid(vcpu_e500);
213         }
214 
215         return sid;
216 }
217 
218 unsigned int kvmppc_e500_get_tlb_stid(struct kvm_vcpu *vcpu,
219                                       struct kvm_book3e_206_tlb_entry *gtlbe)
220 {
221         return kvmppc_e500_get_sid(to_e500(vcpu), get_tlb_ts(gtlbe),
222                                    get_tlb_tid(gtlbe), get_cur_pr(vcpu), 0);
223 }
224 
225 void kvmppc_set_pid(struct kvm_vcpu *vcpu, u32 pid)
226 {
227         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
228 
229         if (vcpu->arch.pid != pid) {
230                 vcpu_e500->pid[0] = vcpu->arch.pid = pid;
231                 kvmppc_e500_recalc_shadow_pid(vcpu_e500);
232         }
233 }
234 
235 /* gtlbe must not be mapped by more than one host tlbe */
236 void kvmppc_e500_tlbil_one(struct kvmppc_vcpu_e500 *vcpu_e500,
237                            struct kvm_book3e_206_tlb_entry *gtlbe)
238 {
239         struct vcpu_id_table *idt = vcpu_e500->idt;
240         unsigned int pr, tid, ts, pid;
241         u32 val, eaddr;
242         unsigned long flags;
243 
244         ts = get_tlb_ts(gtlbe);
245         tid = get_tlb_tid(gtlbe);
246 
247         preempt_disable();
248 
249         /* One guest ID may be mapped to two shadow IDs */
250         for (pr = 0; pr < 2; pr++) {
251                 /*
252                  * The shadow PID can have a valid mapping on at most one
253                  * host CPU.  In the common case, it will be valid on this
254                  * CPU, in which case we do a local invalidation of the
255                  * specific address.
256                  *
257                  * If the shadow PID is not valid on the current host CPU,
258                  * we invalidate the entire shadow PID.
259                  */
260                 pid = local_sid_lookup(&idt->id[ts][tid][pr]);
261                 if (pid <= 0) {
262                         kvmppc_e500_id_table_reset_one(vcpu_e500, ts, tid, pr);
263                         continue;
264                 }
265 
266                 /*
267                  * The guest is invalidating a 4K entry which is in a PID
268                  * that has a valid shadow mapping on this host CPU.  We
269                  * search host TLB to invalidate it's shadow TLB entry,
270                  * similar to __tlbil_va except that we need to look in AS1.
271                  */
272                 val = (pid << MAS6_SPID_SHIFT) | MAS6_SAS;
273                 eaddr = get_tlb_eaddr(gtlbe);
274 
275                 local_irq_save(flags);
276 
277                 mtspr(SPRN_MAS6, val);
278                 asm volatile("tlbsx 0, %[eaddr]" : : [eaddr] "r" (eaddr));
279                 val = mfspr(SPRN_MAS1);
280                 if (val & MAS1_VALID) {
281                         mtspr(SPRN_MAS1, val & ~MAS1_VALID);
282                         asm volatile("tlbwe");
283                 }
284 
285                 local_irq_restore(flags);
286         }
287 
288         preempt_enable();
289 }
290 
291 void kvmppc_e500_tlbil_all(struct kvmppc_vcpu_e500 *vcpu_e500)
292 {
293         kvmppc_e500_id_table_reset_all(vcpu_e500);
294 }
295 
296 void kvmppc_mmu_msr_notify(struct kvm_vcpu *vcpu, u32 old_msr)
297 {
298         /* Recalc shadow pid since MSR changes */
299         kvmppc_e500_recalc_shadow_pid(to_e500(vcpu));
300 }
301 
302 void kvmppc_core_load_host_debugstate(struct kvm_vcpu *vcpu)
303 {
304 }
305 
306 void kvmppc_core_load_guest_debugstate(struct kvm_vcpu *vcpu)
307 {
308 }
309 
310 static void kvmppc_core_vcpu_load_e500(struct kvm_vcpu *vcpu, int cpu)
311 {
312         kvmppc_booke_vcpu_load(vcpu, cpu);
313 
314         /* Shadow PID may be expired on local core */
315         kvmppc_e500_recalc_shadow_pid(to_e500(vcpu));
316 }
317 
318 static void kvmppc_core_vcpu_put_e500(struct kvm_vcpu *vcpu)
319 {
320 #ifdef CONFIG_SPE
321         if (vcpu->arch.shadow_msr & MSR_SPE)
322                 kvmppc_vcpu_disable_spe(vcpu);
323 #endif
324 
325         kvmppc_booke_vcpu_put(vcpu);
326 }
327 
328 int kvmppc_core_check_processor_compat(void)
329 {
330         int r;
331 
332         if (strcmp(cur_cpu_spec->cpu_name, "e500v2") == 0)
333                 r = 0;
334         else
335                 r = -ENOTSUPP;
336 
337         return r;
338 }
339 
340 static void kvmppc_e500_tlb_setup(struct kvmppc_vcpu_e500 *vcpu_e500)
341 {
342         struct kvm_book3e_206_tlb_entry *tlbe;
343 
344         /* Insert large initial mapping for guest. */
345         tlbe = get_entry(vcpu_e500, 1, 0);
346         tlbe->mas1 = MAS1_VALID | MAS1_TSIZE(BOOK3E_PAGESZ_256M);
347         tlbe->mas2 = 0;
348         tlbe->mas7_3 = E500_TLB_SUPER_PERM_MASK;
349 
350         /* 4K map for serial output. Used by kernel wrapper. */
351         tlbe = get_entry(vcpu_e500, 1, 1);
352         tlbe->mas1 = MAS1_VALID | MAS1_TSIZE(BOOK3E_PAGESZ_4K);
353         tlbe->mas2 = (0xe0004500 & 0xFFFFF000) | MAS2_I | MAS2_G;
354         tlbe->mas7_3 = (0xe0004500 & 0xFFFFF000) | E500_TLB_SUPER_PERM_MASK;
355 }
356 
357 int kvmppc_core_vcpu_setup(struct kvm_vcpu *vcpu)
358 {
359         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
360 
361         kvmppc_e500_tlb_setup(vcpu_e500);
362 
363         /* Registers init */
364         vcpu->arch.pvr = mfspr(SPRN_PVR);
365         vcpu_e500->svr = mfspr(SPRN_SVR);
366 
367         vcpu->arch.cpu_type = KVM_CPU_E500V2;
368 
369         return 0;
370 }
371 
372 static int kvmppc_core_get_sregs_e500(struct kvm_vcpu *vcpu,
373                                       struct kvm_sregs *sregs)
374 {
375         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
376 
377         sregs->u.e.features |= KVM_SREGS_E_ARCH206_MMU | KVM_SREGS_E_SPE |
378                                KVM_SREGS_E_PM;
379         sregs->u.e.impl_id = KVM_SREGS_E_IMPL_FSL;
380 
381         sregs->u.e.impl.fsl.features = 0;
382         sregs->u.e.impl.fsl.svr = vcpu_e500->svr;
383         sregs->u.e.impl.fsl.hid0 = vcpu_e500->hid0;
384         sregs->u.e.impl.fsl.mcar = vcpu_e500->mcar;
385 
386         sregs->u.e.ivor_high[0] = vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_UNAVAIL];
387         sregs->u.e.ivor_high[1] = vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_FP_DATA];
388         sregs->u.e.ivor_high[2] = vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_FP_ROUND];
389         sregs->u.e.ivor_high[3] =
390                 vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR];
391 
392         kvmppc_get_sregs_ivor(vcpu, sregs);
393         kvmppc_get_sregs_e500_tlb(vcpu, sregs);
394         return 0;
395 }
396 
397 static int kvmppc_core_set_sregs_e500(struct kvm_vcpu *vcpu,
398                                       struct kvm_sregs *sregs)
399 {
400         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
401         int ret;
402 
403         if (sregs->u.e.impl_id == KVM_SREGS_E_IMPL_FSL) {
404                 vcpu_e500->svr = sregs->u.e.impl.fsl.svr;
405                 vcpu_e500->hid0 = sregs->u.e.impl.fsl.hid0;
406                 vcpu_e500->mcar = sregs->u.e.impl.fsl.mcar;
407         }
408 
409         ret = kvmppc_set_sregs_e500_tlb(vcpu, sregs);
410         if (ret < 0)
411                 return ret;
412 
413         if (!(sregs->u.e.features & KVM_SREGS_E_IVOR))
414                 return 0;
415 
416         if (sregs->u.e.features & KVM_SREGS_E_SPE) {
417                 vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_UNAVAIL] =
418                         sregs->u.e.ivor_high[0];
419                 vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_FP_DATA] =
420                         sregs->u.e.ivor_high[1];
421                 vcpu->arch.ivor[BOOKE_IRQPRIO_SPE_FP_ROUND] =
422                         sregs->u.e.ivor_high[2];
423         }
424 
425         if (sregs->u.e.features & KVM_SREGS_E_PM) {
426                 vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR] =
427                         sregs->u.e.ivor_high[3];
428         }
429 
430         return kvmppc_set_sregs_ivor(vcpu, sregs);
431 }
432 
433 static int kvmppc_get_one_reg_e500(struct kvm_vcpu *vcpu, u64 id,
434                                    union kvmppc_one_reg *val)
435 {
436         int r = kvmppc_get_one_reg_e500_tlb(vcpu, id, val);
437         return r;
438 }
439 
440 static int kvmppc_set_one_reg_e500(struct kvm_vcpu *vcpu, u64 id,
441                                    union kvmppc_one_reg *val)
442 {
443         int r = kvmppc_get_one_reg_e500_tlb(vcpu, id, val);
444         return r;
445 }
446 
447 static struct kvm_vcpu *kvmppc_core_vcpu_create_e500(struct kvm *kvm,
448                                                      unsigned int id)
449 {
450         struct kvmppc_vcpu_e500 *vcpu_e500;
451         struct kvm_vcpu *vcpu;
452         int err;
453 
454         vcpu_e500 = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
455         if (!vcpu_e500) {
456                 err = -ENOMEM;
457                 goto out;
458         }
459 
460         vcpu = &vcpu_e500->vcpu;
461         err = kvm_vcpu_init(vcpu, kvm, id);
462         if (err)
463                 goto free_vcpu;
464 
465         if (kvmppc_e500_id_table_alloc(vcpu_e500) == NULL)
466                 goto uninit_vcpu;
467 
468         err = kvmppc_e500_tlb_init(vcpu_e500);
469         if (err)
470                 goto uninit_id;
471 
472         vcpu->arch.shared = (void*)__get_free_page(GFP_KERNEL|__GFP_ZERO);
473         if (!vcpu->arch.shared)
474                 goto uninit_tlb;
475 
476         return vcpu;
477 
478 uninit_tlb:
479         kvmppc_e500_tlb_uninit(vcpu_e500);
480 uninit_id:
481         kvmppc_e500_id_table_free(vcpu_e500);
482 uninit_vcpu:
483         kvm_vcpu_uninit(vcpu);
484 free_vcpu:
485         kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
486 out:
487         return ERR_PTR(err);
488 }
489 
490 static void kvmppc_core_vcpu_free_e500(struct kvm_vcpu *vcpu)
491 {
492         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
493 
494         free_page((unsigned long)vcpu->arch.shared);
495         kvmppc_e500_tlb_uninit(vcpu_e500);
496         kvmppc_e500_id_table_free(vcpu_e500);
497         kvm_vcpu_uninit(vcpu);
498         kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
499 }
500 
501 static int kvmppc_core_init_vm_e500(struct kvm *kvm)
502 {
503         return 0;
504 }
505 
506 static void kvmppc_core_destroy_vm_e500(struct kvm *kvm)
507 {
508 }
509 
510 static struct kvmppc_ops kvm_ops_e500 = {
511         .get_sregs = kvmppc_core_get_sregs_e500,
512         .set_sregs = kvmppc_core_set_sregs_e500,
513         .get_one_reg = kvmppc_get_one_reg_e500,
514         .set_one_reg = kvmppc_set_one_reg_e500,
515         .vcpu_load   = kvmppc_core_vcpu_load_e500,
516         .vcpu_put    = kvmppc_core_vcpu_put_e500,
517         .vcpu_create = kvmppc_core_vcpu_create_e500,
518         .vcpu_free   = kvmppc_core_vcpu_free_e500,
519         .mmu_destroy  = kvmppc_mmu_destroy_e500,
520         .init_vm = kvmppc_core_init_vm_e500,
521         .destroy_vm = kvmppc_core_destroy_vm_e500,
522         .emulate_op = kvmppc_core_emulate_op_e500,
523         .emulate_mtspr = kvmppc_core_emulate_mtspr_e500,
524         .emulate_mfspr = kvmppc_core_emulate_mfspr_e500,
525 };
526 
527 static int __init kvmppc_e500_init(void)
528 {
529         int r, i;
530         unsigned long ivor[3];
531         /* Process remaining handlers above the generic first 16 */
532         unsigned long *handler = &kvmppc_booke_handler_addr[16];
533         unsigned long handler_len;
534         unsigned long max_ivor = 0;
535 
536         r = kvmppc_core_check_processor_compat();
537         if (r)
538                 goto err_out;
539 
540         r = kvmppc_booke_init();
541         if (r)
542                 goto err_out;
543 
544         /* copy extra E500 exception handlers */
545         ivor[0] = mfspr(SPRN_IVOR32);
546         ivor[1] = mfspr(SPRN_IVOR33);
547         ivor[2] = mfspr(SPRN_IVOR34);
548         for (i = 0; i < 3; i++) {
549                 if (ivor[i] > ivor[max_ivor])
550                         max_ivor = i;
551 
552                 handler_len = handler[i + 1] - handler[i];
553                 memcpy((void *)kvmppc_booke_handlers + ivor[i],
554                        (void *)handler[i], handler_len);
555         }
556         handler_len = handler[max_ivor + 1] - handler[max_ivor];
557         flush_icache_range(kvmppc_booke_handlers, kvmppc_booke_handlers +
558                            ivor[max_ivor] + handler_len);
559 
560         r = kvm_init(NULL, sizeof(struct kvmppc_vcpu_e500), 0, THIS_MODULE);
561         if (r)
562                 goto err_out;
563         kvm_ops_e500.owner = THIS_MODULE;
564         kvmppc_pr_ops = &kvm_ops_e500;
565 
566 err_out:
567         return r;
568 }
569 
570 static void __exit kvmppc_e500_exit(void)
571 {
572         kvmppc_pr_ops = NULL;
573         kvmppc_booke_exit();
574 }
575 
576 module_init(kvmppc_e500_init);
577 module_exit(kvmppc_e500_exit);
578 MODULE_ALIAS_MISCDEV(KVM_MINOR);
579 MODULE_ALIAS("devname:kvm");
580 

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