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mips/kvm: Fix ABI by moving manipulation of CP0 registers to KVM_{G,S}ET_ONE_REG
[deliverable/linux.git] / arch / mips / kvm / kvm_mips.c
CommitLineData
669e846e
SL		 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
35struct 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
54static 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
64gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
65{
66 return gfn;
67}
68
69/* XXXKYMA: We are simulatoring a processor that has the WII bit set in Config7, so we
70 * are "runnable" if interrupts are pending
71 */
72int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
73{
74 return !!(vcpu->arch.pending_exceptions);
75}
76
77int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
78{
79 return 1;
80}
81
82int kvm_arch_hardware_enable(void *garbage)
83{
84 return 0;
85}
86
87void kvm_arch_hardware_disable(void *garbage)
88{
89}
90
91int kvm_arch_hardware_setup(void)
92{
93 return 0;
94}
95
96void kvm_arch_hardware_unsetup(void)
97{
98}
99
100void kvm_arch_check_processor_compat(void *rtn)
101{
102 int *r = (int *)rtn;
103 *r = 0;
104 return;
105}
106
107static void kvm_mips_init_tlbs(struct kvm *kvm)
108{
109 unsigned long wired;
110
111 /* Add a wired entry to the TLB, it is used to map the commpage to the Guest kernel */
112 wired = read_c0_wired();
113 write_c0_wired(wired + 1);
114 mtc0_tlbw_hazard();
115 kvm->arch.commpage_tlb = wired;
116
117 kvm_debug("[%d] commpage TLB: %d\n", smp_processor_id(),
118 kvm->arch.commpage_tlb);
119}
120
121static void kvm_mips_init_vm_percpu(void *arg)
122{
123 struct kvm *kvm = (struct kvm *)arg;
124
125 kvm_mips_init_tlbs(kvm);
126 kvm_mips_callbacks->vm_init(kvm);
127
128}
129
130int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
131{
132 if (atomic_inc_return(&kvm_mips_instance) == 1) {
133 kvm_info("%s: 1st KVM instance, setup host TLB parameters\n",
134 __func__);
135 on_each_cpu(kvm_mips_init_vm_percpu, kvm, 1);
136 }
137
138
139 return 0;
140}
141
142void kvm_mips_free_vcpus(struct kvm *kvm)
143{
144 unsigned int i;
145 struct kvm_vcpu *vcpu;
146
147 /* Put the pages we reserved for the guest pmap */
148 for (i = 0; i < kvm->arch.guest_pmap_npages; i++) {
149 if (kvm->arch.guest_pmap[i] != KVM_INVALID_PAGE)
150 kvm_mips_release_pfn_clean(kvm->arch.guest_pmap[i]);
151 }
152
153 if (kvm->arch.guest_pmap)
154 kfree(kvm->arch.guest_pmap);
155
156 kvm_for_each_vcpu(i, vcpu, kvm) {
157 kvm_arch_vcpu_free(vcpu);
158 }
159
160 mutex_lock(&kvm->lock);
161
162 for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
163 kvm->vcpus[i] = NULL;
164
165 atomic_set(&kvm->online_vcpus, 0);
166
167 mutex_unlock(&kvm->lock);
168}
169
170void kvm_arch_sync_events(struct kvm *kvm)
171{
172}
173
174static void kvm_mips_uninit_tlbs(void *arg)
175{
176 /* Restore wired count */
177 write_c0_wired(0);
178 mtc0_tlbw_hazard();
179 /* Clear out all the TLBs */
180 kvm_local_flush_tlb_all();
181}
182
183void kvm_arch_destroy_vm(struct kvm *kvm)
184{
185 kvm_mips_free_vcpus(kvm);
186
187 /* If this is the last instance, restore wired count */
188 if (atomic_dec_return(&kvm_mips_instance) == 0) {
189 kvm_info("%s: last KVM instance, restoring TLB parameters\n",
190 __func__);
191 on_each_cpu(kvm_mips_uninit_tlbs, NULL, 1);
192 }
193}
194
195long
196kvm_arch_dev_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
197{
198 return -EINVAL;
199}
200
201void kvm_arch_free_memslot(struct kvm_memory_slot *free,
202 struct kvm_memory_slot *dont)
203{
204}
205
206int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages)
207{
208 return 0;
209}
210
211int kvm_arch_prepare_memory_region(struct kvm *kvm,
daf799cc
LT		 212 struct kvm_memory_slot *memslot,
213 struct kvm_userspace_memory_region *mem,
214 enum kvm_mr_change change)
669e846e
SL		 215{
216 return 0;
217}
218
219void kvm_arch_commit_memory_region(struct kvm *kvm,
daf799cc
LT		 220 struct kvm_userspace_memory_region *mem,
221 const struct kvm_memory_slot *old,
222 enum kvm_mr_change change)
669e846e
SL		 223{
224 unsigned long npages = 0;
225 int i, err = 0;
226
227 kvm_debug("%s: kvm: %p slot: %d, GPA: %llx, size: %llx, QVA: %llx\n",
228 __func__, kvm, mem->slot, mem->guest_phys_addr,
229 mem->memory_size, mem->userspace_addr);
230
231 /* Setup Guest PMAP table */
232 if (!kvm->arch.guest_pmap) {
233 if (mem->slot == 0)
234 npages = mem->memory_size >> PAGE_SHIFT;
235
236 if (npages) {
237 kvm->arch.guest_pmap_npages = npages;
238 kvm->arch.guest_pmap =
239 kzalloc(npages * sizeof(unsigned long), GFP_KERNEL);
240
241 if (!kvm->arch.guest_pmap) {
242 kvm_err("Failed to allocate guest PMAP");
243 err = -ENOMEM;
244 goto out;
245 }
246
247 kvm_info
248 ("Allocated space for Guest PMAP Table (%ld pages) @ %p\n",
249 npages, kvm->arch.guest_pmap);
250
251 /* Now setup the page table */
252 for (i = 0; i < npages; i++) {
253 kvm->arch.guest_pmap[i] = KVM_INVALID_PAGE;
254 }
255 }
256 }
257out:
258 return;
259}
260
261void kvm_arch_flush_shadow_all(struct kvm *kvm)
262{
263}
264
265void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
266 struct kvm_memory_slot *slot)
267{
268}
269
270void kvm_arch_flush_shadow(struct kvm *kvm)
271{
272}
273
274struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
275{
276 extern char mips32_exception[], mips32_exceptionEnd[];
277 extern char mips32_GuestException[], mips32_GuestExceptionEnd[];
278 int err, size, offset;
279 void *gebase;
280 int i;
281
282 struct kvm_vcpu *vcpu = kzalloc(sizeof(struct kvm_vcpu), GFP_KERNEL);
283
284 if (!vcpu) {
285 err = -ENOMEM;
286 goto out;
287 }
288
289 err = kvm_vcpu_init(vcpu, kvm, id);
290
291 if (err)
292 goto out_free_cpu;
293
294 kvm_info("kvm @ %p: create cpu %d at %p\n", kvm, id, vcpu);
295
296 /* Allocate space for host mode exception handlers that handle
297 * guest mode exits
298 */
299 if (cpu_has_veic || cpu_has_vint) {
300 size = 0x200 + VECTORSPACING * 64;
301 } else {
302 size = 0x200;
303 }
304
305 /* Save Linux EBASE */
306 vcpu->arch.host_ebase = (void *)read_c0_ebase();
307
308 gebase = kzalloc(ALIGN(size, PAGE_SIZE), GFP_KERNEL);
309
310 if (!gebase) {
311 err = -ENOMEM;
312 goto out_free_cpu;
313 }
314 kvm_info("Allocated %d bytes for KVM Exception Handlers @ %p\n",
315 ALIGN(size, PAGE_SIZE), gebase);
316
317 /* Save new ebase */
318 vcpu->arch.guest_ebase = gebase;
319
320 /* Copy L1 Guest Exception handler to correct offset */
321
322 /* TLB Refill, EXL = 0 */
323 memcpy(gebase, mips32_exception,
324 mips32_exceptionEnd - mips32_exception);
325
326 /* General Exception Entry point */
327 memcpy(gebase + 0x180, mips32_exception,
328 mips32_exceptionEnd - mips32_exception);
329
330 /* For vectored interrupts poke the exception code @ all offsets 0-7 */
331 for (i = 0; i < 8; i++) {
332 kvm_debug("L1 Vectored handler @ %p\n",
333 gebase + 0x200 + (i * VECTORSPACING));
334 memcpy(gebase + 0x200 + (i * VECTORSPACING), mips32_exception,
335 mips32_exceptionEnd - mips32_exception);
336 }
337
338 /* General handler, relocate to unmapped space for sanity's sake */
339 offset = 0x2000;
340 kvm_info("Installing KVM Exception handlers @ %p, %#x bytes\n",
341 gebase + offset,
342 mips32_GuestExceptionEnd - mips32_GuestException);
343
344 memcpy(gebase + offset, mips32_GuestException,
345 mips32_GuestExceptionEnd - mips32_GuestException);
346
347 /* Invalidate the icache for these ranges */
348 mips32_SyncICache((unsigned long) gebase, ALIGN(size, PAGE_SIZE));
349
350 /* Allocate comm page for guest kernel, a TLB will be reserved for mapping GVA @ 0xFFFF8000 to this page */
351 vcpu->arch.kseg0_commpage = kzalloc(PAGE_SIZE << 1, GFP_KERNEL);
352
353 if (!vcpu->arch.kseg0_commpage) {
354 err = -ENOMEM;
355 goto out_free_gebase;
356 }
357
358 kvm_info("Allocated COMM page @ %p\n", vcpu->arch.kseg0_commpage);
359 kvm_mips_commpage_init(vcpu);
360
361 /* Init */
362 vcpu->arch.last_sched_cpu = -1;
363
364 /* Start off the timer */
365 kvm_mips_emulate_count(vcpu);
366
367 return vcpu;
368
369out_free_gebase:
370 kfree(gebase);
371
372out_free_cpu:
373 kfree(vcpu);
374
375out:
376 return ERR_PTR(err);
377}
378
379void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
380{
381 hrtimer_cancel(&vcpu->arch.comparecount_timer);
382
383 kvm_vcpu_uninit(vcpu);
384
385 kvm_mips_dump_stats(vcpu);
386
387 if (vcpu->arch.guest_ebase)
388 kfree(vcpu->arch.guest_ebase);
389
390 if (vcpu->arch.kseg0_commpage)
391 kfree(vcpu->arch.kseg0_commpage);
392
393}
394
395void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
396{
397 kvm_arch_vcpu_free(vcpu);
398}
399
400int
401kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
402 struct kvm_guest_debug *dbg)
403{
404 return -EINVAL;
405}
406
407int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
408{
409 int r = 0;
410 sigset_t sigsaved;
411
412 if (vcpu->sigset_active)
413 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
414
415 if (vcpu->mmio_needed) {
416 if (!vcpu->mmio_is_write)
417 kvm_mips_complete_mmio_load(vcpu, run);
418 vcpu->mmio_needed = 0;
419 }
420
421 /* Check if we have any exceptions/interrupts pending */
422 kvm_mips_deliver_interrupts(vcpu,
423 kvm_read_c0_guest_cause(vcpu->arch.cop0));
424
425 local_irq_disable();
426 kvm_guest_enter();
427
428 r = __kvm_mips_vcpu_run(run, vcpu);
429
430 kvm_guest_exit();
431 local_irq_enable();
432
433 if (vcpu->sigset_active)
434 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
435
436 return r;
437}
438
439int
440kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_mips_interrupt *irq)
441{
442 int intr = (int)irq->irq;
443 struct kvm_vcpu *dvcpu = NULL;
444
445 if (intr == 3 || intr == -3 || intr == 4 || intr == -4)
446 kvm_debug("%s: CPU: %d, INTR: %d\n", __func__, irq->cpu,
447 (int)intr);
448
449 if (irq->cpu == -1)
450 dvcpu = vcpu;
451 else
452 dvcpu = vcpu->kvm->vcpus[irq->cpu];
453
454 if (intr == 2 || intr == 3 || intr == 4) {
455 kvm_mips_callbacks->queue_io_int(dvcpu, irq);
456
457 } else if (intr == -2 || intr == -3 || intr == -4) {
458 kvm_mips_callbacks->dequeue_io_int(dvcpu, irq);
459 } else {
460 kvm_err("%s: invalid interrupt ioctl (%d:%d)\n", __func__,
461 irq->cpu, irq->irq);
462 return -EINVAL;
463 }
464
465 dvcpu->arch.wait = 0;
466
467 if (waitqueue_active(&dvcpu->wq)) {
468 wake_up_interruptible(&dvcpu->wq);
469 }
470
471 return 0;
472}
473
474int
475kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
476 struct kvm_mp_state *mp_state)
477{
478 return -EINVAL;
479}
480
481int
482kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
483 struct kvm_mp_state *mp_state)
484{
485 return -EINVAL;
486}
487
4c73fb2b
DD		 488#define KVM_REG_MIPS_CP0_INDEX (0x10000 + 8 * 0 + 0)
489#define KVM_REG_MIPS_CP0_ENTRYLO0 (0x10000 + 8 * 2 + 0)
490#define KVM_REG_MIPS_CP0_ENTRYLO1 (0x10000 + 8 * 3 + 0)
491#define KVM_REG_MIPS_CP0_CONTEXT (0x10000 + 8 * 4 + 0)
492#define KVM_REG_MIPS_CP0_USERLOCAL (0x10000 + 8 * 4 + 2)
493#define KVM_REG_MIPS_CP0_PAGEMASK (0x10000 + 8 * 5 + 0)
494#define KVM_REG_MIPS_CP0_PAGEGRAIN (0x10000 + 8 * 5 + 1)
495#define KVM_REG_MIPS_CP0_WIRED (0x10000 + 8 * 6 + 0)
496#define KVM_REG_MIPS_CP0_HWRENA (0x10000 + 8 * 7 + 0)
497#define KVM_REG_MIPS_CP0_BADVADDR (0x10000 + 8 * 8 + 0)
498#define KVM_REG_MIPS_CP0_COUNT (0x10000 + 8 * 9 + 0)
499#define KVM_REG_MIPS_CP0_ENTRYHI (0x10000 + 8 * 10 + 0)
500#define KVM_REG_MIPS_CP0_COMPARE (0x10000 + 8 * 11 + 0)
501#define KVM_REG_MIPS_CP0_STATUS (0x10000 + 8 * 12 + 0)
502#define KVM_REG_MIPS_CP0_CAUSE (0x10000 + 8 * 13 + 0)
503#define KVM_REG_MIPS_CP0_EBASE (0x10000 + 8 * 15 + 1)
504#define KVM_REG_MIPS_CP0_CONFIG (0x10000 + 8 * 16 + 0)
505#define KVM_REG_MIPS_CP0_CONFIG1 (0x10000 + 8 * 16 + 1)
506#define KVM_REG_MIPS_CP0_CONFIG2 (0x10000 + 8 * 16 + 2)
507#define KVM_REG_MIPS_CP0_CONFIG3 (0x10000 + 8 * 16 + 3)
508#define KVM_REG_MIPS_CP0_CONFIG7 (0x10000 + 8 * 16 + 7)
509#define KVM_REG_MIPS_CP0_XCONTEXT (0x10000 + 8 * 20 + 0)
510#define KVM_REG_MIPS_CP0_ERROREPC (0x10000 + 8 * 30 + 0)
511
512static u64 kvm_mips_get_one_regs[] = {
513 KVM_REG_MIPS_R0,
514 KVM_REG_MIPS_R1,
515 KVM_REG_MIPS_R2,
516 KVM_REG_MIPS_R3,
517 KVM_REG_MIPS_R4,
518 KVM_REG_MIPS_R5,
519 KVM_REG_MIPS_R6,
520 KVM_REG_MIPS_R7,
521 KVM_REG_MIPS_R8,
522 KVM_REG_MIPS_R9,
523 KVM_REG_MIPS_R10,
524 KVM_REG_MIPS_R11,
525 KVM_REG_MIPS_R12,
526 KVM_REG_MIPS_R13,
527 KVM_REG_MIPS_R14,
528 KVM_REG_MIPS_R15,
529 KVM_REG_MIPS_R16,
530 KVM_REG_MIPS_R17,
531 KVM_REG_MIPS_R18,
532 KVM_REG_MIPS_R19,
533 KVM_REG_MIPS_R20,
534 KVM_REG_MIPS_R21,
535 KVM_REG_MIPS_R22,
536 KVM_REG_MIPS_R23,
537 KVM_REG_MIPS_R24,
538 KVM_REG_MIPS_R25,
539 KVM_REG_MIPS_R26,
540 KVM_REG_MIPS_R27,
541 KVM_REG_MIPS_R28,
542 KVM_REG_MIPS_R29,
543 KVM_REG_MIPS_R30,
544 KVM_REG_MIPS_R31,
545
546 KVM_REG_MIPS_HI,
547 KVM_REG_MIPS_LO,
548 KVM_REG_MIPS_PC,
549
550 KVM_REG_MIPS_CP0_INDEX,
551 KVM_REG_MIPS_CP0_CONTEXT,
552 KVM_REG_MIPS_CP0_PAGEMASK,
553 KVM_REG_MIPS_CP0_WIRED,
554 KVM_REG_MIPS_CP0_BADVADDR,
555 KVM_REG_MIPS_CP0_ENTRYHI,
556 KVM_REG_MIPS_CP0_STATUS,
557 KVM_REG_MIPS_CP0_CAUSE,
558 /* EPC set via kvm_regs, et al. */
559 KVM_REG_MIPS_CP0_CONFIG,
560 KVM_REG_MIPS_CP0_CONFIG1,
561 KVM_REG_MIPS_CP0_CONFIG2,
562 KVM_REG_MIPS_CP0_CONFIG3,
563 KVM_REG_MIPS_CP0_CONFIG7,
564 KVM_REG_MIPS_CP0_ERROREPC
565};
566
567static int kvm_mips_get_reg(struct kvm_vcpu *vcpu,
568 const struct kvm_one_reg *reg)
569{
570 u64 __user *uaddr = (u64 __user *)(long)reg->addr;
571
572 struct mips_coproc *cop0 = vcpu->arch.cop0;
573 s64 v;
574
575 switch (reg->id) {
576 case KVM_REG_MIPS_R0 ... KVM_REG_MIPS_R31:
577 v = (long)vcpu->arch.gprs[reg->id - KVM_REG_MIPS_R0];
578 break;
579 case KVM_REG_MIPS_HI:
580 v = (long)vcpu->arch.hi;
581 break;
582 case KVM_REG_MIPS_LO:
583 v = (long)vcpu->arch.lo;
584 break;
585 case KVM_REG_MIPS_PC:
586 v = (long)vcpu->arch.pc;
587 break;
588
589 case KVM_REG_MIPS_CP0_INDEX:
590 v = (long)kvm_read_c0_guest_index(cop0);
591 break;
592 case KVM_REG_MIPS_CP0_CONTEXT:
593 v = (long)kvm_read_c0_guest_context(cop0);
594 break;
595 case KVM_REG_MIPS_CP0_PAGEMASK:
596 v = (long)kvm_read_c0_guest_pagemask(cop0);
597 break;
598 case KVM_REG_MIPS_CP0_WIRED:
599 v = (long)kvm_read_c0_guest_wired(cop0);
600 break;
601 case KVM_REG_MIPS_CP0_BADVADDR:
602 v = (long)kvm_read_c0_guest_badvaddr(cop0);
603 break;
604 case KVM_REG_MIPS_CP0_ENTRYHI:
605 v = (long)kvm_read_c0_guest_entryhi(cop0);
606 break;
607 case KVM_REG_MIPS_CP0_STATUS:
608 v = (long)kvm_read_c0_guest_status(cop0);
609 break;
610 case KVM_REG_MIPS_CP0_CAUSE:
611 v = (long)kvm_read_c0_guest_cause(cop0);
612 break;
613 case KVM_REG_MIPS_CP0_ERROREPC:
614 v = (long)kvm_read_c0_guest_errorepc(cop0);
615 break;
616 case KVM_REG_MIPS_CP0_CONFIG:
617 v = (long)kvm_read_c0_guest_config(cop0);
618 break;
619 case KVM_REG_MIPS_CP0_CONFIG1:
620 v = (long)kvm_read_c0_guest_config1(cop0);
621 break;
622 case KVM_REG_MIPS_CP0_CONFIG2:
623 v = (long)kvm_read_c0_guest_config2(cop0);
624 break;
625 case KVM_REG_MIPS_CP0_CONFIG3:
626 v = (long)kvm_read_c0_guest_config3(cop0);
627 break;
628 case KVM_REG_MIPS_CP0_CONFIG7:
629 v = (long)kvm_read_c0_guest_config7(cop0);
630 break;
631 default:
632 return -EINVAL;
633 }
634 return put_user(v, uaddr);
635}
636
637static int kvm_mips_set_reg(struct kvm_vcpu *vcpu,
638 const struct kvm_one_reg *reg)
639{
640 u64 __user *uaddr = (u64 __user *)(long)reg->addr;
641 struct mips_coproc *cop0 = vcpu->arch.cop0;
642 u64 v;
643
644 if (get_user(v, uaddr) != 0)
645 return -EFAULT;
646
647 switch (reg->id) {
648 case KVM_REG_MIPS_R0:
649 /* Silently ignore requests to set $0 */
650 break;
651 case KVM_REG_MIPS_R1 ... KVM_REG_MIPS_R31:
652 vcpu->arch.gprs[reg->id - KVM_REG_MIPS_R0] = v;
653 break;
654 case KVM_REG_MIPS_HI:
655 vcpu->arch.hi = v;
656 break;
657 case KVM_REG_MIPS_LO:
658 vcpu->arch.lo = v;
659 break;
660 case KVM_REG_MIPS_PC:
661 vcpu->arch.pc = v;
662 break;
663
664 case KVM_REG_MIPS_CP0_INDEX:
665 kvm_write_c0_guest_index(cop0, v);
666 break;
667 case KVM_REG_MIPS_CP0_CONTEXT:
668 kvm_write_c0_guest_context(cop0, v);
669 break;
670 case KVM_REG_MIPS_CP0_PAGEMASK:
671 kvm_write_c0_guest_pagemask(cop0, v);
672 break;
673 case KVM_REG_MIPS_CP0_WIRED:
674 kvm_write_c0_guest_wired(cop0, v);
675 break;
676 case KVM_REG_MIPS_CP0_BADVADDR:
677 kvm_write_c0_guest_badvaddr(cop0, v);
678 break;
679 case KVM_REG_MIPS_CP0_ENTRYHI:
680 kvm_write_c0_guest_entryhi(cop0, v);
681 break;
682 case KVM_REG_MIPS_CP0_STATUS:
683 kvm_write_c0_guest_status(cop0, v);
684 break;
685 case KVM_REG_MIPS_CP0_CAUSE:
686 kvm_write_c0_guest_cause(cop0, v);
687 break;
688 case KVM_REG_MIPS_CP0_ERROREPC:
689 kvm_write_c0_guest_errorepc(cop0, v);
690 break;
691 default:
692 return -EINVAL;
693 }
694 return 0;
695}
696
669e846e
SL		 697long
698kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
699{
700 struct kvm_vcpu *vcpu = filp->private_data;
701 void __user *argp = (void __user *)arg;
702 long r;
669e846e
SL		 703
704 switch (ioctl) {
4c73fb2b
DD		 705 case KVM_SET_ONE_REG:
706 case KVM_GET_ONE_REG: {
707 struct kvm_one_reg reg;
708 if (copy_from_user(&reg, argp, sizeof(reg)))
709 return -EFAULT;
710 if (ioctl == KVM_SET_ONE_REG)
711 return kvm_mips_set_reg(vcpu, &reg);
712 else
713 return kvm_mips_get_reg(vcpu, &reg);
714 }
715 case KVM_GET_REG_LIST: {
716 struct kvm_reg_list __user *user_list = argp;
717 u64 __user *reg_dest;
718 struct kvm_reg_list reg_list;
719 unsigned n;
720
721 if (copy_from_user(&reg_list, user_list, sizeof(reg_list)))
722 return -EFAULT;
723 n = reg_list.n;
724 reg_list.n = ARRAY_SIZE(kvm_mips_get_one_regs);
725 if (copy_to_user(user_list, &reg_list, sizeof(reg_list)))
726 return -EFAULT;
727 if (n < reg_list.n)
728 return -E2BIG;
729 reg_dest = user_list->reg;
730 if (copy_to_user(reg_dest, kvm_mips_get_one_regs,
731 sizeof(kvm_mips_get_one_regs)))
732 return -EFAULT;
733 return 0;
734 }
669e846e
SL		 735 case KVM_NMI:
736 /* Treat the NMI as a CPU reset */
737 r = kvm_mips_reset_vcpu(vcpu);
738 break;
739 case KVM_INTERRUPT:
740 {
741 struct kvm_mips_interrupt irq;
742 r = -EFAULT;
743 if (copy_from_user(&irq, argp, sizeof(irq)))
744 goto out;
745
669e846e
SL		 746 kvm_debug("[%d] %s: irq: %d\n", vcpu->vcpu_id, __func__,
747 irq.irq);
748
749 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
750 break;
751 }
752 default:
4c73fb2b 753 r = -ENOIOCTLCMD;
669e846e
SL		 754 }
755
756out:
757 return r;
758}
759
760/*
761 * Get (and clear) the dirty memory log for a memory slot.
762 */
763int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
764{
765 struct kvm_memory_slot *memslot;
766 unsigned long ga, ga_end;
767 int is_dirty = 0;
768 int r;
769 unsigned long n;
770
771 mutex_lock(&kvm->slots_lock);
772
773 r = kvm_get_dirty_log(kvm, log, &is_dirty);
774 if (r)
775 goto out;
776
777 /* If nothing is dirty, don't bother messing with page tables. */
778 if (is_dirty) {
779 memslot = &kvm->memslots->memslots[log->slot];
780
781 ga = memslot->base_gfn << PAGE_SHIFT;
782 ga_end = ga + (memslot->npages << PAGE_SHIFT);
783
784 printk("%s: dirty, ga: %#lx, ga_end %#lx\n", __func__, ga,
785 ga_end);
786
787 n = kvm_dirty_bitmap_bytes(memslot);
788 memset(memslot->dirty_bitmap, 0, n);
789 }
790
791 r = 0;
792out:
793 mutex_unlock(&kvm->slots_lock);
794 return r;
795
796}
797
798long kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
799{
800 long r;
801
802 switch (ioctl) {
803 default:
804 r = -EINVAL;
805 }
806
807 return r;
808}
809
810int kvm_arch_init(void *opaque)
811{
812 int ret;
813
814 if (kvm_mips_callbacks) {
815 kvm_err("kvm: module already exists\n");
816 return -EEXIST;
817 }
818
819 ret = kvm_mips_emulation_init(&kvm_mips_callbacks);
820
821 return ret;
822}
823
824void kvm_arch_exit(void)
825{
826 kvm_mips_callbacks = NULL;
827}
828
829int
830kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
831{
832 return -ENOTSUPP;
833}
834
835int
836kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
837{
838 return -ENOTSUPP;
839}
840
841int kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
842{
843 return 0;
844}
845
846int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
847{
848 return -ENOTSUPP;
849}
850
851int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
852{
853 return -ENOTSUPP;
854}
855
856int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
857{
858 return VM_FAULT_SIGBUS;
859}
860
861int kvm_dev_ioctl_check_extension(long ext)
862{
863 int r;
864
865 switch (ext) {
4c73fb2b
DD		 866 case KVM_CAP_ONE_REG:
867 r = 1;
868 break;
669e846e
SL		 869 case KVM_CAP_COALESCED_MMIO:
870 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
871 break;
872 default:
873 r = 0;
874 break;
875 }
876 return r;
669e846e
SL		 877}
878
879int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
880{
881 return kvm_mips_pending_timer(vcpu);
882}
883
884int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu)
885{
886 int i;
887 struct mips_coproc *cop0;
888
889 if (!vcpu)
890 return -1;
891
892 printk("VCPU Register Dump:\n");
893 printk("\tpc = 0x%08lx\n", vcpu->arch.pc);;
894 printk("\texceptions: %08lx\n", vcpu->arch.pending_exceptions);
895
896 for (i = 0; i < 32; i += 4) {
897 printk("\tgpr%02d: %08lx %08lx %08lx %08lx\n", i,
898 vcpu->arch.gprs[i],
899 vcpu->arch.gprs[i + 1],
900 vcpu->arch.gprs[i + 2], vcpu->arch.gprs[i + 3]);
901 }
902 printk("\thi: 0x%08lx\n", vcpu->arch.hi);
903 printk("\tlo: 0x%08lx\n", vcpu->arch.lo);
904
905 cop0 = vcpu->arch.cop0;
906 printk("\tStatus: 0x%08lx, Cause: 0x%08lx\n",
907 kvm_read_c0_guest_status(cop0), kvm_read_c0_guest_cause(cop0));
908
909 printk("\tEPC: 0x%08lx\n", kvm_read_c0_guest_epc(cop0));
910
911 return 0;
912}
913
914int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
915{
916 int i;
917
8d17dd04 918 for (i = 1; i < ARRAY_SIZE(vcpu->arch.gprs); i++)
bf32ebf6 919 vcpu->arch.gprs[i] = regs->gpr[i];
8d17dd04 920 vcpu->arch.gprs[0] = 0; /* zero is special, and cannot be set. */
669e846e
SL		 921 vcpu->arch.hi = regs->hi;
922 vcpu->arch.lo = regs->lo;
923 vcpu->arch.pc = regs->pc;
924
4c73fb2b 925 return 0;
669e846e
SL		 926}
927
928int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
929{
930 int i;
931
8d17dd04 932 for (i = 0; i < ARRAY_SIZE(vcpu->arch.gprs); i++)
bf32ebf6 933 regs->gpr[i] = vcpu->arch.gprs[i];
669e846e
SL		 934
935 regs->hi = vcpu->arch.hi;
936 regs->lo = vcpu->arch.lo;
937 regs->pc = vcpu->arch.pc;
938
4c73fb2b 939 return 0;
669e846e
SL		 940}
941
942void kvm_mips_comparecount_func(unsigned long data)
943{
944 struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
945
946 kvm_mips_callbacks->queue_timer_int(vcpu);
947
948 vcpu->arch.wait = 0;
949 if (waitqueue_active(&vcpu->wq)) {
950 wake_up_interruptible(&vcpu->wq);
951 }
952}
953
954/*
955 * low level hrtimer wake routine.
956 */
957enum hrtimer_restart kvm_mips_comparecount_wakeup(struct hrtimer *timer)
958{
959 struct kvm_vcpu *vcpu;
960
961 vcpu = container_of(timer, struct kvm_vcpu, arch.comparecount_timer);
962 kvm_mips_comparecount_func((unsigned long) vcpu);
963 hrtimer_forward_now(&vcpu->arch.comparecount_timer,
964 ktime_set(0, MS_TO_NS(10)));
965 return HRTIMER_RESTART;
966}
967
968int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
969{
970 kvm_mips_callbacks->vcpu_init(vcpu);
971 hrtimer_init(&vcpu->arch.comparecount_timer, CLOCK_MONOTONIC,
972 HRTIMER_MODE_REL);
973 vcpu->arch.comparecount_timer.function = kvm_mips_comparecount_wakeup;
974 kvm_mips_init_shadow_tlb(vcpu);
975 return 0;
976}
977
978void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
979{
980 return;
981}
982
983int
984kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, struct kvm_translation *tr)
985{
986 return 0;
987}
988
989/* Initial guest state */
990int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
991{
992 return kvm_mips_callbacks->vcpu_setup(vcpu);
993}
994
995static
996void kvm_mips_set_c0_status(void)
997{
998 uint32_t status = read_c0_status();
999
1000 if (cpu_has_fpu)
1001 status |= (ST0_CU1);
1002
1003 if (cpu_has_dsp)
1004 status |= (ST0_MX);
1005
1006 write_c0_status(status);
1007 ehb();
1008}
1009
1010/*
1011 * Return value is in the form (errcode<<2 | RESUME_FLAG_HOST | RESUME_FLAG_NV)
1012 */
1013int kvm_mips_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu)
1014{
1015 uint32_t cause = vcpu->arch.host_cp0_cause;
1016 uint32_t exccode = (cause >> CAUSEB_EXCCODE) & 0x1f;
1017 uint32_t __user *opc = (uint32_t __user *) vcpu->arch.pc;
1018 unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr;
1019 enum emulation_result er = EMULATE_DONE;
1020 int ret = RESUME_GUEST;
1021
1022 /* Set a default exit reason */
1023 run->exit_reason = KVM_EXIT_UNKNOWN;
1024 run->ready_for_interrupt_injection = 1;
1025
1026 /* Set the appropriate status bits based on host CPU features, before we hit the scheduler */
1027 kvm_mips_set_c0_status();
1028
1029 local_irq_enable();
1030
1031 kvm_debug("kvm_mips_handle_exit: cause: %#x, PC: %p, kvm_run: %p, kvm_vcpu: %p\n",
1032 cause, opc, run, vcpu);
1033
1034 /* Do a privilege check, if in UM most of these exit conditions end up
1035 * causing an exception to be delivered to the Guest Kernel
1036 */
1037 er = kvm_mips_check_privilege(cause, opc, run, vcpu);
1038 if (er == EMULATE_PRIV_FAIL) {
1039 goto skip_emul;
1040 } else if (er == EMULATE_FAIL) {
1041 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1042 ret = RESUME_HOST;
1043 goto skip_emul;
1044 }
1045
1046 switch (exccode) {
1047 case T_INT:
1048 kvm_debug("[%d]T_INT @ %p\n", vcpu->vcpu_id, opc);
1049
1050 ++vcpu->stat.int_exits;
1051 trace_kvm_exit(vcpu, INT_EXITS);
1052
1053 if (need_resched()) {
1054 cond_resched();
1055 }
1056
1057 ret = RESUME_GUEST;
1058 break;
1059
1060 case T_COP_UNUSABLE:
1061 kvm_debug("T_COP_UNUSABLE: @ PC: %p\n", opc);
1062
1063 ++vcpu->stat.cop_unusable_exits;
1064 trace_kvm_exit(vcpu, COP_UNUSABLE_EXITS);
1065 ret = kvm_mips_callbacks->handle_cop_unusable(vcpu);
1066 /* XXXKYMA: Might need to return to user space */
1067 if (run->exit_reason == KVM_EXIT_IRQ_WINDOW_OPEN) {
1068 ret = RESUME_HOST;
1069 }
1070 break;
1071
1072 case T_TLB_MOD:
1073 ++vcpu->stat.tlbmod_exits;
1074 trace_kvm_exit(vcpu, TLBMOD_EXITS);
1075 ret = kvm_mips_callbacks->handle_tlb_mod(vcpu);
1076 break;
1077
1078 case T_TLB_ST_MISS:
1079 kvm_debug
1080 ("TLB ST fault: cause %#x, status %#lx, PC: %p, BadVaddr: %#lx\n",
1081 cause, kvm_read_c0_guest_status(vcpu->arch.cop0), opc,
1082 badvaddr);
1083
1084 ++vcpu->stat.tlbmiss_st_exits;
1085 trace_kvm_exit(vcpu, TLBMISS_ST_EXITS);
1086 ret = kvm_mips_callbacks->handle_tlb_st_miss(vcpu);
1087 break;
1088
1089 case T_TLB_LD_MISS:
1090 kvm_debug("TLB LD fault: cause %#x, PC: %p, BadVaddr: %#lx\n",
1091 cause, opc, badvaddr);
1092
1093 ++vcpu->stat.tlbmiss_ld_exits;
1094 trace_kvm_exit(vcpu, TLBMISS_LD_EXITS);
1095 ret = kvm_mips_callbacks->handle_tlb_ld_miss(vcpu);
1096 break;
1097
1098 case T_ADDR_ERR_ST:
1099 ++vcpu->stat.addrerr_st_exits;
1100 trace_kvm_exit(vcpu, ADDRERR_ST_EXITS);
1101 ret = kvm_mips_callbacks->handle_addr_err_st(vcpu);
1102 break;
1103
1104 case T_ADDR_ERR_LD:
1105 ++vcpu->stat.addrerr_ld_exits;
1106 trace_kvm_exit(vcpu, ADDRERR_LD_EXITS);
1107 ret = kvm_mips_callbacks->handle_addr_err_ld(vcpu);
1108 break;
1109
1110 case T_SYSCALL:
1111 ++vcpu->stat.syscall_exits;
1112 trace_kvm_exit(vcpu, SYSCALL_EXITS);
1113 ret = kvm_mips_callbacks->handle_syscall(vcpu);
1114 break;
1115
1116 case T_RES_INST:
1117 ++vcpu->stat.resvd_inst_exits;
1118 trace_kvm_exit(vcpu, RESVD_INST_EXITS);
1119 ret = kvm_mips_callbacks->handle_res_inst(vcpu);
1120 break;
1121
1122 case T_BREAK:
1123 ++vcpu->stat.break_inst_exits;
1124 trace_kvm_exit(vcpu, BREAK_INST_EXITS);
1125 ret = kvm_mips_callbacks->handle_break(vcpu);
1126 break;
1127
1128 default:
1129 kvm_err
1130 ("Exception Code: %d, not yet handled, @ PC: %p, inst: 0x%08x BadVaddr: %#lx Status: %#lx\n",
1131 exccode, opc, kvm_get_inst(opc, vcpu), badvaddr,
1132 kvm_read_c0_guest_status(vcpu->arch.cop0));
1133 kvm_arch_vcpu_dump_regs(vcpu);
1134 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1135 ret = RESUME_HOST;
1136 break;
1137
1138 }
1139
1140skip_emul:
1141 local_irq_disable();
1142
1143 if (er == EMULATE_DONE && !(ret & RESUME_HOST))
1144 kvm_mips_deliver_interrupts(vcpu, cause);
1145
1146 if (!(ret & RESUME_HOST)) {
1147 /* Only check for signals if not already exiting to userspace */
1148 if (signal_pending(current)) {
1149 run->exit_reason = KVM_EXIT_INTR;
1150 ret = (-EINTR << 2) | RESUME_HOST;
1151 ++vcpu->stat.signal_exits;
1152 trace_kvm_exit(vcpu, SIGNAL_EXITS);
1153 }
1154 }
1155
1156 return ret;
1157}
1158
1159int __init kvm_mips_init(void)
1160{
1161 int ret;
1162
1163 ret = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
1164
1165 if (ret)
1166 return ret;
1167
1168 /* On MIPS, kernel modules are executed from "mapped space", which requires TLBs.
1169 * The TLB handling code is statically linked with the rest of the kernel (kvm_tlb.c)
1170 * to avoid the possibility of double faulting. The issue is that the TLB code
1171 * references routines that are part of the the KVM module,
1172 * which are only available once the module is loaded.
1173 */
1174 kvm_mips_gfn_to_pfn = gfn_to_pfn;
1175 kvm_mips_release_pfn_clean = kvm_release_pfn_clean;
1176 kvm_mips_is_error_pfn = is_error_pfn;
1177
1178 pr_info("KVM/MIPS Initialized\n");
1179 return 0;
1180}
1181
1182void __exit kvm_mips_exit(void)
1183{
1184 kvm_exit();
1185
1186 kvm_mips_gfn_to_pfn = NULL;
1187 kvm_mips_release_pfn_clean = NULL;
1188 kvm_mips_is_error_pfn = NULL;
1189
1190 pr_info("KVM/MIPS unloaded\n");
1191}
1192
1193module_init(kvm_mips_init);
1194module_exit(kvm_mips_exit);
1195
1196EXPORT_TRACEPOINT_SYMBOL(kvm_exit);
Linux kernel - Deliverables
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