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[mirror_ubuntu-artful-kernel.git] / arch / mips / kvm / kvm_mips.c
1 /*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * KVM/MIPS: MIPS specific KVM APIs
7 *
8 * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
9 * Authors: Sanjay Lal <sanjayl@kymasys.com>
10 */
11
12 #include <linux/errno.h>
13 #include <linux/err.h>
14 #include <linux/module.h>
15 #include <linux/vmalloc.h>
16 #include <linux/fs.h>
17 #include <linux/bootmem.h>
18 #include <asm/page.h>
19 #include <asm/cacheflush.h>
20 #include <asm/mmu_context.h>
21
22 #include <linux/kvm_host.h>
23
24 #include "kvm_mips_int.h"
25 #include "kvm_mips_comm.h"
26
27 #define CREATE_TRACE_POINTS
28 #include "trace.h"
29
30 #ifndef VECTORSPACING
31 #define VECTORSPACING 0x100 /* for EI/VI mode */
32 #endif
33
34 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
35 struct kvm_stats_debugfs_item debugfs_entries[] = {
36 { "wait", VCPU_STAT(wait_exits) },
37 { "cache", VCPU_STAT(cache_exits) },
38 { "signal", VCPU_STAT(signal_exits) },
39 { "interrupt", VCPU_STAT(int_exits) },
40 { "cop_unsuable", VCPU_STAT(cop_unusable_exits) },
41 { "tlbmod", VCPU_STAT(tlbmod_exits) },
42 { "tlbmiss_ld", VCPU_STAT(tlbmiss_ld_exits) },
43 { "tlbmiss_st", VCPU_STAT(tlbmiss_st_exits) },
44 { "addrerr_st", VCPU_STAT(addrerr_st_exits) },
45 { "addrerr_ld", VCPU_STAT(addrerr_ld_exits) },
46 { "syscall", VCPU_STAT(syscall_exits) },
47 { "resvd_inst", VCPU_STAT(resvd_inst_exits) },
48 { "break_inst", VCPU_STAT(break_inst_exits) },
49 { "flush_dcache", VCPU_STAT(flush_dcache_exits) },
50 { "halt_wakeup", VCPU_STAT(halt_wakeup) },
51 {NULL}
52 };
53
54 static int kvm_mips_reset_vcpu(struct kvm_vcpu *vcpu)
55 {
56 int i;
57 for_each_possible_cpu(i) {
58 vcpu->arch.guest_kernel_asid[i] = 0;
59 vcpu->arch.guest_user_asid[i] = 0;
60 }
61 return 0;
62 }
63
64 /* XXXKYMA: We are simulatoring a processor that has the WII bit set in Config7, so we
65 * are "runnable" if interrupts are pending
66 */
67 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
68 {
69 return !!(vcpu->arch.pending_exceptions);
70 }
71
72 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
73 {
74 return 1;
75 }
76
77 int kvm_arch_hardware_enable(void *garbage)
78 {
79 return 0;
80 }
81
82 void kvm_arch_hardware_disable(void *garbage)
83 {
84 }
85
86 int kvm_arch_hardware_setup(void)
87 {
88 return 0;
89 }
90
91 void kvm_arch_hardware_unsetup(void)
92 {
93 }
94
95 void kvm_arch_check_processor_compat(void *rtn)
96 {
97 int *r = (int *)rtn;
98 *r = 0;
99 return;
100 }
101
102 static void kvm_mips_init_tlbs(struct kvm *kvm)
103 {
104 unsigned long wired;
105
106 /* Add a wired entry to the TLB, it is used to map the commpage to the Guest kernel */
107 wired = read_c0_wired();
108 write_c0_wired(wired + 1);
109 mtc0_tlbw_hazard();
110 kvm->arch.commpage_tlb = wired;
111
112 kvm_debug("[%d] commpage TLB: %d\n", smp_processor_id(),
113 kvm->arch.commpage_tlb);
114 }
115
116 static void kvm_mips_init_vm_percpu(void *arg)
117 {
118 struct kvm *kvm = (struct kvm *)arg;
119
120 kvm_mips_init_tlbs(kvm);
121 kvm_mips_callbacks->vm_init(kvm);
122
123 }
124
125 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
126 {
127 if (atomic_inc_return(&kvm_mips_instance) == 1) {
128 kvm_debug("%s: 1st KVM instance, setup host TLB parameters\n",
129 __func__);
130 on_each_cpu(kvm_mips_init_vm_percpu, kvm, 1);
131 }
132
133
134 return 0;
135 }
136
137 void kvm_mips_free_vcpus(struct kvm *kvm)
138 {
139 unsigned int i;
140 struct kvm_vcpu *vcpu;
141
142 /* Put the pages we reserved for the guest pmap */
143 for (i = 0; i < kvm->arch.guest_pmap_npages; i++) {
144 if (kvm->arch.guest_pmap[i] != KVM_INVALID_PAGE)
145 kvm_mips_release_pfn_clean(kvm->arch.guest_pmap[i]);
146 }
147 kfree(kvm->arch.guest_pmap);
148
149 kvm_for_each_vcpu(i, vcpu, kvm) {
150 kvm_arch_vcpu_free(vcpu);
151 }
152
153 mutex_lock(&kvm->lock);
154
155 for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
156 kvm->vcpus[i] = NULL;
157
158 atomic_set(&kvm->online_vcpus, 0);
159
160 mutex_unlock(&kvm->lock);
161 }
162
163 void kvm_arch_sync_events(struct kvm *kvm)
164 {
165 }
166
167 static void kvm_mips_uninit_tlbs(void *arg)
168 {
169 /* Restore wired count */
170 write_c0_wired(0);
171 mtc0_tlbw_hazard();
172 /* Clear out all the TLBs */
173 kvm_local_flush_tlb_all();
174 }
175
176 void kvm_arch_destroy_vm(struct kvm *kvm)
177 {
178 kvm_mips_free_vcpus(kvm);
179
180 /* If this is the last instance, restore wired count */
181 if (atomic_dec_return(&kvm_mips_instance) == 0) {
182 kvm_debug("%s: last KVM instance, restoring TLB parameters\n",
183 __func__);
184 on_each_cpu(kvm_mips_uninit_tlbs, NULL, 1);
185 }
186 }
187
188 long
189 kvm_arch_dev_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
190 {
191 return -ENOIOCTLCMD;
192 }
193
194 void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
195 struct kvm_memory_slot *dont)
196 {
197 }
198
199 int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
200 unsigned long npages)
201 {
202 return 0;
203 }
204
205 void kvm_arch_memslots_updated(struct kvm *kvm)
206 {
207 }
208
209 int kvm_arch_prepare_memory_region(struct kvm *kvm,
210 struct kvm_memory_slot *memslot,
211 struct kvm_userspace_memory_region *mem,
212 enum kvm_mr_change change)
213 {
214 return 0;
215 }
216
217 void kvm_arch_commit_memory_region(struct kvm *kvm,
218 struct kvm_userspace_memory_region *mem,
219 const struct kvm_memory_slot *old,
220 enum kvm_mr_change change)
221 {
222 unsigned long npages = 0;
223 int i, err = 0;
224
225 kvm_debug("%s: kvm: %p slot: %d, GPA: %llx, size: %llx, QVA: %llx\n",
226 __func__, kvm, mem->slot, mem->guest_phys_addr,
227 mem->memory_size, mem->userspace_addr);
228
229 /* Setup Guest PMAP table */
230 if (!kvm->arch.guest_pmap) {
231 if (mem->slot == 0)
232 npages = mem->memory_size >> PAGE_SHIFT;
233
234 if (npages) {
235 kvm->arch.guest_pmap_npages = npages;
236 kvm->arch.guest_pmap =
237 kzalloc(npages * sizeof(unsigned long), GFP_KERNEL);
238
239 if (!kvm->arch.guest_pmap) {
240 kvm_err("Failed to allocate guest PMAP");
241 err = -ENOMEM;
242 goto out;
243 }
244
245 kvm_debug("Allocated space for Guest PMAP Table (%ld pages) @ %p\n",
246 npages, kvm->arch.guest_pmap);
247
248 /* Now setup the page table */
249 for (i = 0; i < npages; i++) {
250 kvm->arch.guest_pmap[i] = KVM_INVALID_PAGE;
251 }
252 }
253 }
254 out:
255 return;
256 }
257
258 void kvm_arch_flush_shadow_all(struct kvm *kvm)
259 {
260 }
261
262 void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
263 struct kvm_memory_slot *slot)
264 {
265 }
266
267 void kvm_arch_flush_shadow(struct kvm *kvm)
268 {
269 }
270
271 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
272 {
273 extern char mips32_exception[], mips32_exceptionEnd[];
274 extern char mips32_GuestException[], mips32_GuestExceptionEnd[];
275 int err, size, offset;
276 void *gebase;
277 int i;
278
279 struct kvm_vcpu *vcpu = kzalloc(sizeof(struct kvm_vcpu), GFP_KERNEL);
280
281 if (!vcpu) {
282 err = -ENOMEM;
283 goto out;
284 }
285
286 err = kvm_vcpu_init(vcpu, kvm, id);
287
288 if (err)
289 goto out_free_cpu;
290
291 kvm_debug("kvm @ %p: create cpu %d at %p\n", kvm, id, vcpu);
292
293 /* Allocate space for host mode exception handlers that handle
294 * guest mode exits
295 */
296 if (cpu_has_veic || cpu_has_vint) {
297 size = 0x200 + VECTORSPACING * 64;
298 } else {
299 size = 0x4000;
300 }
301
302 /* Save Linux EBASE */
303 vcpu->arch.host_ebase = (void *)read_c0_ebase();
304
305 gebase = kzalloc(ALIGN(size, PAGE_SIZE), GFP_KERNEL);
306
307 if (!gebase) {
308 err = -ENOMEM;
309 goto out_free_cpu;
310 }
311 kvm_debug("Allocated %d bytes for KVM Exception Handlers @ %p\n",
312 ALIGN(size, PAGE_SIZE), gebase);
313
314 /* Save new ebase */
315 vcpu->arch.guest_ebase = gebase;
316
317 /* Copy L1 Guest Exception handler to correct offset */
318
319 /* TLB Refill, EXL = 0 */
320 memcpy(gebase, mips32_exception,
321 mips32_exceptionEnd - mips32_exception);
322
323 /* General Exception Entry point */
324 memcpy(gebase + 0x180, mips32_exception,
325 mips32_exceptionEnd - mips32_exception);
326
327 /* For vectored interrupts poke the exception code @ all offsets 0-7 */
328 for (i = 0; i < 8; i++) {
329 kvm_debug("L1 Vectored handler @ %p\n",
330 gebase + 0x200 + (i * VECTORSPACING));
331 memcpy(gebase + 0x200 + (i * VECTORSPACING), mips32_exception,
332 mips32_exceptionEnd - mips32_exception);
333 }
334
335 /* General handler, relocate to unmapped space for sanity's sake */
336 offset = 0x2000;
337 kvm_debug("Installing KVM Exception handlers @ %p, %#x bytes\n",
338 gebase + offset,
339 mips32_GuestExceptionEnd - mips32_GuestException);
340
341 memcpy(gebase + offset, mips32_GuestException,
342 mips32_GuestExceptionEnd - mips32_GuestException);
343
344 /* Invalidate the icache for these ranges */
345 local_flush_icache_range((unsigned long)gebase,
346 (unsigned long)gebase + ALIGN(size, PAGE_SIZE));
347
348 /* Allocate comm page for guest kernel, a TLB will be reserved for mapping GVA @ 0xFFFF8000 to this page */
349 vcpu->arch.kseg0_commpage = kzalloc(PAGE_SIZE << 1, GFP_KERNEL);
350
351 if (!vcpu->arch.kseg0_commpage) {
352 err = -ENOMEM;
353 goto out_free_gebase;
354 }
355
356 kvm_debug("Allocated COMM page @ %p\n", vcpu->arch.kseg0_commpage);
357 kvm_mips_commpage_init(vcpu);
358
359 /* Init */
360 vcpu->arch.last_sched_cpu = -1;
361
362 /* Start off the timer */
363 kvm_mips_init_count(vcpu);
364
365 return vcpu;
366
367 out_free_gebase:
368 kfree(gebase);
369
370 out_free_cpu:
371 kfree(vcpu);
372
373 out:
374 return ERR_PTR(err);
375 }
376
377 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
378 {
379 hrtimer_cancel(&vcpu->arch.comparecount_timer);
380
381 kvm_vcpu_uninit(vcpu);
382
383 kvm_mips_dump_stats(vcpu);
384
385 kfree(vcpu->arch.guest_ebase);
386 kfree(vcpu->arch.kseg0_commpage);
387 kfree(vcpu);
388 }
389
390 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
391 {
392 kvm_arch_vcpu_free(vcpu);
393 }
394
395 int
396 kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
397 struct kvm_guest_debug *dbg)
398 {
399 return -ENOIOCTLCMD;
400 }
401
402 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
403 {
404 int r = 0;
405 sigset_t sigsaved;
406
407 if (vcpu->sigset_active)
408 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
409
410 if (vcpu->mmio_needed) {
411 if (!vcpu->mmio_is_write)
412 kvm_mips_complete_mmio_load(vcpu, run);
413 vcpu->mmio_needed = 0;
414 }
415
416 local_irq_disable();
417 /* Check if we have any exceptions/interrupts pending */
418 kvm_mips_deliver_interrupts(vcpu,
419 kvm_read_c0_guest_cause(vcpu->arch.cop0));
420
421 kvm_guest_enter();
422
423 r = __kvm_mips_vcpu_run(run, vcpu);
424
425 kvm_guest_exit();
426 local_irq_enable();
427
428 if (vcpu->sigset_active)
429 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
430
431 return r;
432 }
433
434 int
435 kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_mips_interrupt *irq)
436 {
437 int intr = (int)irq->irq;
438 struct kvm_vcpu *dvcpu = NULL;
439
440 if (intr == 3 || intr == -3 || intr == 4 || intr == -4)
441 kvm_debug("%s: CPU: %d, INTR: %d\n", __func__, irq->cpu,
442 (int)intr);
443
444 if (irq->cpu == -1)
445 dvcpu = vcpu;
446 else
447 dvcpu = vcpu->kvm->vcpus[irq->cpu];
448
449 if (intr == 2 || intr == 3 || intr == 4) {
450 kvm_mips_callbacks->queue_io_int(dvcpu, irq);
451
452 } else if (intr == -2 || intr == -3 || intr == -4) {
453 kvm_mips_callbacks->dequeue_io_int(dvcpu, irq);
454 } else {
455 kvm_err("%s: invalid interrupt ioctl (%d:%d)\n", __func__,
456 irq->cpu, irq->irq);
457 return -EINVAL;
458 }
459
460 dvcpu->arch.wait = 0;
461
462 if (waitqueue_active(&dvcpu->wq)) {
463 wake_up_interruptible(&dvcpu->wq);
464 }
465
466 return 0;
467 }
468
469 int
470 kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
471 struct kvm_mp_state *mp_state)
472 {
473 return -ENOIOCTLCMD;
474 }
475
476 int
477 kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
478 struct kvm_mp_state *mp_state)
479 {
480 return -ENOIOCTLCMD;
481 }
482
483 static u64 kvm_mips_get_one_regs[] = {
484 KVM_REG_MIPS_R0,
485 KVM_REG_MIPS_R1,
486 KVM_REG_MIPS_R2,
487 KVM_REG_MIPS_R3,
488 KVM_REG_MIPS_R4,
489 KVM_REG_MIPS_R5,
490 KVM_REG_MIPS_R6,
491 KVM_REG_MIPS_R7,
492 KVM_REG_MIPS_R8,
493 KVM_REG_MIPS_R9,
494 KVM_REG_MIPS_R10,
495 KVM_REG_MIPS_R11,
496 KVM_REG_MIPS_R12,
497 KVM_REG_MIPS_R13,
498 KVM_REG_MIPS_R14,
499 KVM_REG_MIPS_R15,
500 KVM_REG_MIPS_R16,
501 KVM_REG_MIPS_R17,
502 KVM_REG_MIPS_R18,
503 KVM_REG_MIPS_R19,
504 KVM_REG_MIPS_R20,
505 KVM_REG_MIPS_R21,
506 KVM_REG_MIPS_R22,
507 KVM_REG_MIPS_R23,
508 KVM_REG_MIPS_R24,
509 KVM_REG_MIPS_R25,
510 KVM_REG_MIPS_R26,
511 KVM_REG_MIPS_R27,
512 KVM_REG_MIPS_R28,
513 KVM_REG_MIPS_R29,
514 KVM_REG_MIPS_R30,
515 KVM_REG_MIPS_R31,
516
517 KVM_REG_MIPS_HI,
518 KVM_REG_MIPS_LO,
519 KVM_REG_MIPS_PC,
520
521 KVM_REG_MIPS_CP0_INDEX,
522 KVM_REG_MIPS_CP0_CONTEXT,
523 KVM_REG_MIPS_CP0_USERLOCAL,
524 KVM_REG_MIPS_CP0_PAGEMASK,
525 KVM_REG_MIPS_CP0_WIRED,
526 KVM_REG_MIPS_CP0_HWRENA,
527 KVM_REG_MIPS_CP0_BADVADDR,
528 KVM_REG_MIPS_CP0_COUNT,
529 KVM_REG_MIPS_CP0_ENTRYHI,
530 KVM_REG_MIPS_CP0_COMPARE,
531 KVM_REG_MIPS_CP0_STATUS,
532 KVM_REG_MIPS_CP0_CAUSE,
533 KVM_REG_MIPS_CP0_EPC,
534 KVM_REG_MIPS_CP0_CONFIG,
535 KVM_REG_MIPS_CP0_CONFIG1,
536 KVM_REG_MIPS_CP0_CONFIG2,
537 KVM_REG_MIPS_CP0_CONFIG3,
538 KVM_REG_MIPS_CP0_CONFIG7,
539 KVM_REG_MIPS_CP0_ERROREPC,
540
541 KVM_REG_MIPS_COUNT_CTL,
542 KVM_REG_MIPS_COUNT_RESUME,
543 KVM_REG_MIPS_COUNT_HZ,
544 };
545
546 static int kvm_mips_get_reg(struct kvm_vcpu *vcpu,
547 const struct kvm_one_reg *reg)
548 {
549 struct mips_coproc *cop0 = vcpu->arch.cop0;
550 int ret;
551 s64 v;
552
553 switch (reg->id) {
554 case KVM_REG_MIPS_R0 ... KVM_REG_MIPS_R31:
555 v = (long)vcpu->arch.gprs[reg->id - KVM_REG_MIPS_R0];
556 break;
557 case KVM_REG_MIPS_HI:
558 v = (long)vcpu->arch.hi;
559 break;
560 case KVM_REG_MIPS_LO:
561 v = (long)vcpu->arch.lo;
562 break;
563 case KVM_REG_MIPS_PC:
564 v = (long)vcpu->arch.pc;
565 break;
566
567 case KVM_REG_MIPS_CP0_INDEX:
568 v = (long)kvm_read_c0_guest_index(cop0);
569 break;
570 case KVM_REG_MIPS_CP0_CONTEXT:
571 v = (long)kvm_read_c0_guest_context(cop0);
572 break;
573 case KVM_REG_MIPS_CP0_USERLOCAL:
574 v = (long)kvm_read_c0_guest_userlocal(cop0);
575 break;
576 case KVM_REG_MIPS_CP0_PAGEMASK:
577 v = (long)kvm_read_c0_guest_pagemask(cop0);
578 break;
579 case KVM_REG_MIPS_CP0_WIRED:
580 v = (long)kvm_read_c0_guest_wired(cop0);
581 break;
582 case KVM_REG_MIPS_CP0_HWRENA:
583 v = (long)kvm_read_c0_guest_hwrena(cop0);
584 break;
585 case KVM_REG_MIPS_CP0_BADVADDR:
586 v = (long)kvm_read_c0_guest_badvaddr(cop0);
587 break;
588 case KVM_REG_MIPS_CP0_ENTRYHI:
589 v = (long)kvm_read_c0_guest_entryhi(cop0);
590 break;
591 case KVM_REG_MIPS_CP0_COMPARE:
592 v = (long)kvm_read_c0_guest_compare(cop0);
593 break;
594 case KVM_REG_MIPS_CP0_STATUS:
595 v = (long)kvm_read_c0_guest_status(cop0);
596 break;
597 case KVM_REG_MIPS_CP0_CAUSE:
598 v = (long)kvm_read_c0_guest_cause(cop0);
599 break;
600 case KVM_REG_MIPS_CP0_EPC:
601 v = (long)kvm_read_c0_guest_epc(cop0);
602 break;
603 case KVM_REG_MIPS_CP0_ERROREPC:
604 v = (long)kvm_read_c0_guest_errorepc(cop0);
605 break;
606 case KVM_REG_MIPS_CP0_CONFIG:
607 v = (long)kvm_read_c0_guest_config(cop0);
608 break;
609 case KVM_REG_MIPS_CP0_CONFIG1:
610 v = (long)kvm_read_c0_guest_config1(cop0);
611 break;
612 case KVM_REG_MIPS_CP0_CONFIG2:
613 v = (long)kvm_read_c0_guest_config2(cop0);
614 break;
615 case KVM_REG_MIPS_CP0_CONFIG3:
616 v = (long)kvm_read_c0_guest_config3(cop0);
617 break;
618 case KVM_REG_MIPS_CP0_CONFIG7:
619 v = (long)kvm_read_c0_guest_config7(cop0);
620 break;
621 /* registers to be handled specially */
622 case KVM_REG_MIPS_CP0_COUNT:
623 case KVM_REG_MIPS_COUNT_CTL:
624 case KVM_REG_MIPS_COUNT_RESUME:
625 case KVM_REG_MIPS_COUNT_HZ:
626 ret = kvm_mips_callbacks->get_one_reg(vcpu, reg, &v);
627 if (ret)
628 return ret;
629 break;
630 default:
631 return -EINVAL;
632 }
633 if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64) {
634 u64 __user *uaddr64 = (u64 __user *)(long)reg->addr;
635 return put_user(v, uaddr64);
636 } else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U32) {
637 u32 __user *uaddr32 = (u32 __user *)(long)reg->addr;
638 u32 v32 = (u32)v;
639 return put_user(v32, uaddr32);
640 } else {
641 return -EINVAL;
642 }
643 }
644
645 static int kvm_mips_set_reg(struct kvm_vcpu *vcpu,
646 const struct kvm_one_reg *reg)
647 {
648 struct mips_coproc *cop0 = vcpu->arch.cop0;
649 u64 v;
650
651 if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64) {
652 u64 __user *uaddr64 = (u64 __user *)(long)reg->addr;
653
654 if (get_user(v, uaddr64) != 0)
655 return -EFAULT;
656 } else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U32) {
657 u32 __user *uaddr32 = (u32 __user *)(long)reg->addr;
658 s32 v32;
659
660 if (get_user(v32, uaddr32) != 0)
661 return -EFAULT;
662 v = (s64)v32;
663 } else {
664 return -EINVAL;
665 }
666
667 switch (reg->id) {
668 case KVM_REG_MIPS_R0:
669 /* Silently ignore requests to set $0 */
670 break;
671 case KVM_REG_MIPS_R1 ... KVM_REG_MIPS_R31:
672 vcpu->arch.gprs[reg->id - KVM_REG_MIPS_R0] = v;
673 break;
674 case KVM_REG_MIPS_HI:
675 vcpu->arch.hi = v;
676 break;
677 case KVM_REG_MIPS_LO:
678 vcpu->arch.lo = v;
679 break;
680 case KVM_REG_MIPS_PC:
681 vcpu->arch.pc = v;
682 break;
683
684 case KVM_REG_MIPS_CP0_INDEX:
685 kvm_write_c0_guest_index(cop0, v);
686 break;
687 case KVM_REG_MIPS_CP0_CONTEXT:
688 kvm_write_c0_guest_context(cop0, v);
689 break;
690 case KVM_REG_MIPS_CP0_USERLOCAL:
691 kvm_write_c0_guest_userlocal(cop0, v);
692 break;
693 case KVM_REG_MIPS_CP0_PAGEMASK:
694 kvm_write_c0_guest_pagemask(cop0, v);
695 break;
696 case KVM_REG_MIPS_CP0_WIRED:
697 kvm_write_c0_guest_wired(cop0, v);
698 break;
699 case KVM_REG_MIPS_CP0_HWRENA:
700 kvm_write_c0_guest_hwrena(cop0, v);
701 break;
702 case KVM_REG_MIPS_CP0_BADVADDR:
703 kvm_write_c0_guest_badvaddr(cop0, v);
704 break;
705 case KVM_REG_MIPS_CP0_ENTRYHI:
706 kvm_write_c0_guest_entryhi(cop0, v);
707 break;
708 case KVM_REG_MIPS_CP0_STATUS:
709 kvm_write_c0_guest_status(cop0, v);
710 break;
711 case KVM_REG_MIPS_CP0_EPC:
712 kvm_write_c0_guest_epc(cop0, v);
713 break;
714 case KVM_REG_MIPS_CP0_ERROREPC:
715 kvm_write_c0_guest_errorepc(cop0, v);
716 break;
717 /* registers to be handled specially */
718 case KVM_REG_MIPS_CP0_COUNT:
719 case KVM_REG_MIPS_CP0_COMPARE:
720 case KVM_REG_MIPS_CP0_CAUSE:
721 case KVM_REG_MIPS_COUNT_CTL:
722 case KVM_REG_MIPS_COUNT_RESUME:
723 case KVM_REG_MIPS_COUNT_HZ:
724 return kvm_mips_callbacks->set_one_reg(vcpu, reg, v);
725 default:
726 return -EINVAL;
727 }
728 return 0;
729 }
730
731 long
732 kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
733 {
734 struct kvm_vcpu *vcpu = filp->private_data;
735 void __user *argp = (void __user *)arg;
736 long r;
737
738 switch (ioctl) {
739 case KVM_SET_ONE_REG:
740 case KVM_GET_ONE_REG: {
741 struct kvm_one_reg reg;
742 if (copy_from_user(&reg, argp, sizeof(reg)))
743 return -EFAULT;
744 if (ioctl == KVM_SET_ONE_REG)
745 return kvm_mips_set_reg(vcpu, &reg);
746 else
747 return kvm_mips_get_reg(vcpu, &reg);
748 }
749 case KVM_GET_REG_LIST: {
750 struct kvm_reg_list __user *user_list = argp;
751 u64 __user *reg_dest;
752 struct kvm_reg_list reg_list;
753 unsigned n;
754
755 if (copy_from_user(&reg_list, user_list, sizeof(reg_list)))
756 return -EFAULT;
757 n = reg_list.n;
758 reg_list.n = ARRAY_SIZE(kvm_mips_get_one_regs);
759 if (copy_to_user(user_list, &reg_list, sizeof(reg_list)))
760 return -EFAULT;
761 if (n < reg_list.n)
762 return -E2BIG;
763 reg_dest = user_list->reg;
764 if (copy_to_user(reg_dest, kvm_mips_get_one_regs,
765 sizeof(kvm_mips_get_one_regs)))
766 return -EFAULT;
767 return 0;
768 }
769 case KVM_NMI:
770 /* Treat the NMI as a CPU reset */
771 r = kvm_mips_reset_vcpu(vcpu);
772 break;
773 case KVM_INTERRUPT:
774 {
775 struct kvm_mips_interrupt irq;
776 r = -EFAULT;
777 if (copy_from_user(&irq, argp, sizeof(irq)))
778 goto out;
779
780 kvm_debug("[%d] %s: irq: %d\n", vcpu->vcpu_id, __func__,
781 irq.irq);
782
783 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
784 break;
785 }
786 default:
787 r = -ENOIOCTLCMD;
788 }
789
790 out:
791 return r;
792 }
793
794 /*
795 * Get (and clear) the dirty memory log for a memory slot.
796 */
797 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
798 {
799 struct kvm_memory_slot *memslot;
800 unsigned long ga, ga_end;
801 int is_dirty = 0;
802 int r;
803 unsigned long n;
804
805 mutex_lock(&kvm->slots_lock);
806
807 r = kvm_get_dirty_log(kvm, log, &is_dirty);
808 if (r)
809 goto out;
810
811 /* If nothing is dirty, don't bother messing with page tables. */
812 if (is_dirty) {
813 memslot = &kvm->memslots->memslots[log->slot];
814
815 ga = memslot->base_gfn << PAGE_SHIFT;
816 ga_end = ga + (memslot->npages << PAGE_SHIFT);
817
818 printk("%s: dirty, ga: %#lx, ga_end %#lx\n", __func__, ga,
819 ga_end);
820
821 n = kvm_dirty_bitmap_bytes(memslot);
822 memset(memslot->dirty_bitmap, 0, n);
823 }
824
825 r = 0;
826 out:
827 mutex_unlock(&kvm->slots_lock);
828 return r;
829
830 }
831
832 long kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
833 {
834 long r;
835
836 switch (ioctl) {
837 default:
838 r = -ENOIOCTLCMD;
839 }
840
841 return r;
842 }
843
844 int kvm_arch_init(void *opaque)
845 {
846 int ret;
847
848 if (kvm_mips_callbacks) {
849 kvm_err("kvm: module already exists\n");
850 return -EEXIST;
851 }
852
853 ret = kvm_mips_emulation_init(&kvm_mips_callbacks);
854
855 return ret;
856 }
857
858 void kvm_arch_exit(void)
859 {
860 kvm_mips_callbacks = NULL;
861 }
862
863 int
864 kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
865 {
866 return -ENOIOCTLCMD;
867 }
868
869 int
870 kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
871 {
872 return -ENOIOCTLCMD;
873 }
874
875 int kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
876 {
877 return 0;
878 }
879
880 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
881 {
882 return -ENOIOCTLCMD;
883 }
884
885 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
886 {
887 return -ENOIOCTLCMD;
888 }
889
890 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
891 {
892 return VM_FAULT_SIGBUS;
893 }
894
895 int kvm_dev_ioctl_check_extension(long ext)
896 {
897 int r;
898
899 switch (ext) {
900 case KVM_CAP_ONE_REG:
901 r = 1;
902 break;
903 case KVM_CAP_COALESCED_MMIO:
904 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
905 break;
906 default:
907 r = 0;
908 break;
909 }
910 return r;
911 }
912
913 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
914 {
915 return kvm_mips_pending_timer(vcpu);
916 }
917
918 int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu)
919 {
920 int i;
921 struct mips_coproc *cop0;
922
923 if (!vcpu)
924 return -1;
925
926 printk("VCPU Register Dump:\n");
927 printk("\tpc = 0x%08lx\n", vcpu->arch.pc);
928 printk("\texceptions: %08lx\n", vcpu->arch.pending_exceptions);
929
930 for (i = 0; i < 32; i += 4) {
931 printk("\tgpr%02d: %08lx %08lx %08lx %08lx\n", i,
932 vcpu->arch.gprs[i],
933 vcpu->arch.gprs[i + 1],
934 vcpu->arch.gprs[i + 2], vcpu->arch.gprs[i + 3]);
935 }
936 printk("\thi: 0x%08lx\n", vcpu->arch.hi);
937 printk("\tlo: 0x%08lx\n", vcpu->arch.lo);
938
939 cop0 = vcpu->arch.cop0;
940 printk("\tStatus: 0x%08lx, Cause: 0x%08lx\n",
941 kvm_read_c0_guest_status(cop0), kvm_read_c0_guest_cause(cop0));
942
943 printk("\tEPC: 0x%08lx\n", kvm_read_c0_guest_epc(cop0));
944
945 return 0;
946 }
947
948 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
949 {
950 int i;
951
952 for (i = 1; i < ARRAY_SIZE(vcpu->arch.gprs); i++)
953 vcpu->arch.gprs[i] = regs->gpr[i];
954 vcpu->arch.gprs[0] = 0; /* zero is special, and cannot be set. */
955 vcpu->arch.hi = regs->hi;
956 vcpu->arch.lo = regs->lo;
957 vcpu->arch.pc = regs->pc;
958
959 return 0;
960 }
961
962 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
963 {
964 int i;
965
966 for (i = 0; i < ARRAY_SIZE(vcpu->arch.gprs); i++)
967 regs->gpr[i] = vcpu->arch.gprs[i];
968
969 regs->hi = vcpu->arch.hi;
970 regs->lo = vcpu->arch.lo;
971 regs->pc = vcpu->arch.pc;
972
973 return 0;
974 }
975
976 static void kvm_mips_comparecount_func(unsigned long data)
977 {
978 struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
979
980 kvm_mips_callbacks->queue_timer_int(vcpu);
981
982 vcpu->arch.wait = 0;
983 if (waitqueue_active(&vcpu->wq)) {
984 wake_up_interruptible(&vcpu->wq);
985 }
986 }
987
988 /*
989 * low level hrtimer wake routine.
990 */
991 static enum hrtimer_restart kvm_mips_comparecount_wakeup(struct hrtimer *timer)
992 {
993 struct kvm_vcpu *vcpu;
994
995 vcpu = container_of(timer, struct kvm_vcpu, arch.comparecount_timer);
996 kvm_mips_comparecount_func((unsigned long) vcpu);
997 return kvm_mips_count_timeout(vcpu);
998 }
999
1000 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
1001 {
1002 kvm_mips_callbacks->vcpu_init(vcpu);
1003 hrtimer_init(&vcpu->arch.comparecount_timer, CLOCK_MONOTONIC,
1004 HRTIMER_MODE_REL);
1005 vcpu->arch.comparecount_timer.function = kvm_mips_comparecount_wakeup;
1006 return 0;
1007 }
1008
1009 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
1010 {
1011 return;
1012 }
1013
1014 int
1015 kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, struct kvm_translation *tr)
1016 {
1017 return 0;
1018 }
1019
1020 /* Initial guest state */
1021 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
1022 {
1023 return kvm_mips_callbacks->vcpu_setup(vcpu);
1024 }
1025
1026 static
1027 void kvm_mips_set_c0_status(void)
1028 {
1029 uint32_t status = read_c0_status();
1030
1031 if (cpu_has_fpu)
1032 status |= (ST0_CU1);
1033
1034 if (cpu_has_dsp)
1035 status |= (ST0_MX);
1036
1037 write_c0_status(status);
1038 ehb();
1039 }
1040
1041 /*
1042 * Return value is in the form (errcode<<2 | RESUME_FLAG_HOST | RESUME_FLAG_NV)
1043 */
1044 int kvm_mips_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu)
1045 {
1046 uint32_t cause = vcpu->arch.host_cp0_cause;
1047 uint32_t exccode = (cause >> CAUSEB_EXCCODE) & 0x1f;
1048 uint32_t __user *opc = (uint32_t __user *) vcpu->arch.pc;
1049 unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr;
1050 enum emulation_result er = EMULATE_DONE;
1051 int ret = RESUME_GUEST;
1052
1053 /* Set a default exit reason */
1054 run->exit_reason = KVM_EXIT_UNKNOWN;
1055 run->ready_for_interrupt_injection = 1;
1056
1057 /* Set the appropriate status bits based on host CPU features, before we hit the scheduler */
1058 kvm_mips_set_c0_status();
1059
1060 local_irq_enable();
1061
1062 kvm_debug("kvm_mips_handle_exit: cause: %#x, PC: %p, kvm_run: %p, kvm_vcpu: %p\n",
1063 cause, opc, run, vcpu);
1064
1065 /* Do a privilege check, if in UM most of these exit conditions end up
1066 * causing an exception to be delivered to the Guest Kernel
1067 */
1068 er = kvm_mips_check_privilege(cause, opc, run, vcpu);
1069 if (er == EMULATE_PRIV_FAIL) {
1070 goto skip_emul;
1071 } else if (er == EMULATE_FAIL) {
1072 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1073 ret = RESUME_HOST;
1074 goto skip_emul;
1075 }
1076
1077 switch (exccode) {
1078 case T_INT:
1079 kvm_debug("[%d]T_INT @ %p\n", vcpu->vcpu_id, opc);
1080
1081 ++vcpu->stat.int_exits;
1082 trace_kvm_exit(vcpu, INT_EXITS);
1083
1084 if (need_resched()) {
1085 cond_resched();
1086 }
1087
1088 ret = RESUME_GUEST;
1089 break;
1090
1091 case T_COP_UNUSABLE:
1092 kvm_debug("T_COP_UNUSABLE: @ PC: %p\n", opc);
1093
1094 ++vcpu->stat.cop_unusable_exits;
1095 trace_kvm_exit(vcpu, COP_UNUSABLE_EXITS);
1096 ret = kvm_mips_callbacks->handle_cop_unusable(vcpu);
1097 /* XXXKYMA: Might need to return to user space */
1098 if (run->exit_reason == KVM_EXIT_IRQ_WINDOW_OPEN) {
1099 ret = RESUME_HOST;
1100 }
1101 break;
1102
1103 case T_TLB_MOD:
1104 ++vcpu->stat.tlbmod_exits;
1105 trace_kvm_exit(vcpu, TLBMOD_EXITS);
1106 ret = kvm_mips_callbacks->handle_tlb_mod(vcpu);
1107 break;
1108
1109 case T_TLB_ST_MISS:
1110 kvm_debug
1111 ("TLB ST fault: cause %#x, status %#lx, PC: %p, BadVaddr: %#lx\n",
1112 cause, kvm_read_c0_guest_status(vcpu->arch.cop0), opc,
1113 badvaddr);
1114
1115 ++vcpu->stat.tlbmiss_st_exits;
1116 trace_kvm_exit(vcpu, TLBMISS_ST_EXITS);
1117 ret = kvm_mips_callbacks->handle_tlb_st_miss(vcpu);
1118 break;
1119
1120 case T_TLB_LD_MISS:
1121 kvm_debug("TLB LD fault: cause %#x, PC: %p, BadVaddr: %#lx\n",
1122 cause, opc, badvaddr);
1123
1124 ++vcpu->stat.tlbmiss_ld_exits;
1125 trace_kvm_exit(vcpu, TLBMISS_LD_EXITS);
1126 ret = kvm_mips_callbacks->handle_tlb_ld_miss(vcpu);
1127 break;
1128
1129 case T_ADDR_ERR_ST:
1130 ++vcpu->stat.addrerr_st_exits;
1131 trace_kvm_exit(vcpu, ADDRERR_ST_EXITS);
1132 ret = kvm_mips_callbacks->handle_addr_err_st(vcpu);
1133 break;
1134
1135 case T_ADDR_ERR_LD:
1136 ++vcpu->stat.addrerr_ld_exits;
1137 trace_kvm_exit(vcpu, ADDRERR_LD_EXITS);
1138 ret = kvm_mips_callbacks->handle_addr_err_ld(vcpu);
1139 break;
1140
1141 case T_SYSCALL:
1142 ++vcpu->stat.syscall_exits;
1143 trace_kvm_exit(vcpu, SYSCALL_EXITS);
1144 ret = kvm_mips_callbacks->handle_syscall(vcpu);
1145 break;
1146
1147 case T_RES_INST:
1148 ++vcpu->stat.resvd_inst_exits;
1149 trace_kvm_exit(vcpu, RESVD_INST_EXITS);
1150 ret = kvm_mips_callbacks->handle_res_inst(vcpu);
1151 break;
1152
1153 case T_BREAK:
1154 ++vcpu->stat.break_inst_exits;
1155 trace_kvm_exit(vcpu, BREAK_INST_EXITS);
1156 ret = kvm_mips_callbacks->handle_break(vcpu);
1157 break;
1158
1159 default:
1160 kvm_err
1161 ("Exception Code: %d, not yet handled, @ PC: %p, inst: 0x%08x BadVaddr: %#lx Status: %#lx\n",
1162 exccode, opc, kvm_get_inst(opc, vcpu), badvaddr,
1163 kvm_read_c0_guest_status(vcpu->arch.cop0));
1164 kvm_arch_vcpu_dump_regs(vcpu);
1165 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1166 ret = RESUME_HOST;
1167 break;
1168
1169 }
1170
1171 skip_emul:
1172 local_irq_disable();
1173
1174 if (er == EMULATE_DONE && !(ret & RESUME_HOST))
1175 kvm_mips_deliver_interrupts(vcpu, cause);
1176
1177 if (!(ret & RESUME_HOST)) {
1178 /* Only check for signals if not already exiting to userspace */
1179 if (signal_pending(current)) {
1180 run->exit_reason = KVM_EXIT_INTR;
1181 ret = (-EINTR << 2) | RESUME_HOST;
1182 ++vcpu->stat.signal_exits;
1183 trace_kvm_exit(vcpu, SIGNAL_EXITS);
1184 }
1185 }
1186
1187 return ret;
1188 }
1189
1190 int __init kvm_mips_init(void)
1191 {
1192 int ret;
1193
1194 ret = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
1195
1196 if (ret)
1197 return ret;
1198
1199 /* On MIPS, kernel modules are executed from "mapped space", which requires TLBs.
1200 * The TLB handling code is statically linked with the rest of the kernel (kvm_tlb.c)
1201 * to avoid the possibility of double faulting. The issue is that the TLB code
1202 * references routines that are part of the the KVM module,
1203 * which are only available once the module is loaded.
1204 */
1205 kvm_mips_gfn_to_pfn = gfn_to_pfn;
1206 kvm_mips_release_pfn_clean = kvm_release_pfn_clean;
1207 kvm_mips_is_error_pfn = is_error_pfn;
1208
1209 pr_info("KVM/MIPS Initialized\n");
1210 return 0;
1211 }
1212
1213 void __exit kvm_mips_exit(void)
1214 {
1215 kvm_exit();
1216
1217 kvm_mips_gfn_to_pfn = NULL;
1218 kvm_mips_release_pfn_clean = NULL;
1219 kvm_mips_is_error_pfn = NULL;
1220
1221 pr_info("KVM/MIPS unloaded\n");
1222 }
1223
1224 module_init(kvm_mips_init);
1225 module_exit(kvm_mips_exit);
1226
1227 EXPORT_TRACEPOINT_SYMBOL(kvm_exit);
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