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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: Support for hardware virtualization extensions
7 *
8 * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
9 * Authors: Yann Le Du <ledu@kymasys.com>
10 */
11
12#include <linux/errno.h>
13#include <linux/err.h>
14#include <linux/module.h>
15#include <linux/preempt.h>
16#include <linux/vmalloc.h>
17#include <asm/cacheflush.h>
18#include <asm/cacheops.h>
19#include <asm/cmpxchg.h>
20#include <asm/fpu.h>
21#include <asm/hazards.h>
22#include <asm/inst.h>
23#include <asm/mmu_context.h>
24#include <asm/r4kcache.h>
25#include <asm/time.h>
26#include <asm/tlb.h>
27#include <asm/tlbex.h>
28
29#include <linux/kvm_host.h>
30
31#include "interrupt.h"
32
33#include "trace.h"
34
35/* Pointers to last VCPU loaded on each physical CPU */
36static struct kvm_vcpu *last_vcpu[NR_CPUS];
37/* Pointers to last VCPU executed on each physical CPU */
38static struct kvm_vcpu *last_exec_vcpu[NR_CPUS];
39
40/*
41 * Number of guest VTLB entries to use, so we can catch inconsistency between
42 * CPUs.
43 */
44static unsigned int kvm_vz_guest_vtlb_size;
45
46static inline long kvm_vz_read_gc0_ebase(void)
47{
48 if (sizeof(long) == 8 && cpu_has_ebase_wg)
49 return read_gc0_ebase_64();
50 else
51 return read_gc0_ebase();
52}
53
54static inline void kvm_vz_write_gc0_ebase(long v)
55{
56 /*
57 * First write with WG=1 to write upper bits, then write again in case
58 * WG should be left at 0.
59 * write_gc0_ebase_64() is no longer UNDEFINED since R6.
60 */
61 if (sizeof(long) == 8 &&
62 (cpu_has_mips64r6 || cpu_has_ebase_wg)) {
63 write_gc0_ebase_64(v | MIPS_EBASE_WG);
64 write_gc0_ebase_64(v);
65 } else {
66 write_gc0_ebase(v | MIPS_EBASE_WG);
67 write_gc0_ebase(v);
68 }
69}
70
71/*
72 * These Config bits may be writable by the guest:
73 * Config: [K23, KU] (!TLB), K0
74 * Config1: (none)
75 * Config2: [TU, SU] (impl)
76 * Config3: ISAOnExc
77 * Config4: FTLBPageSize
78 * Config5: K, CV, MSAEn, UFE, FRE, SBRI, UFR
79 */
80
81static inline unsigned int kvm_vz_config_guest_wrmask(struct kvm_vcpu *vcpu)
82{
83 return CONF_CM_CMASK;
84}
85
86static inline unsigned int kvm_vz_config1_guest_wrmask(struct kvm_vcpu *vcpu)
87{
88 return 0;
89}
90
91static inline unsigned int kvm_vz_config2_guest_wrmask(struct kvm_vcpu *vcpu)
92{
93 return 0;
94}
95
96static inline unsigned int kvm_vz_config3_guest_wrmask(struct kvm_vcpu *vcpu)
97{
98 return MIPS_CONF3_ISA_OE;
99}
100
101static inline unsigned int kvm_vz_config4_guest_wrmask(struct kvm_vcpu *vcpu)
102{
103 /* no need to be exact */
104 return MIPS_CONF4_VFTLBPAGESIZE;
105}
106
107static inline unsigned int kvm_vz_config5_guest_wrmask(struct kvm_vcpu *vcpu)
108{
109 unsigned int mask = MIPS_CONF5_K | MIPS_CONF5_CV | MIPS_CONF5_SBRI;
110
111 /* Permit MSAEn changes if MSA supported and enabled */
112 if (kvm_mips_guest_has_msa(&vcpu->arch))
113 mask |= MIPS_CONF5_MSAEN;
114
115 /*
116 * Permit guest FPU mode changes if FPU is enabled and the relevant
117 * feature exists according to FIR register.
118 */
119 if (kvm_mips_guest_has_fpu(&vcpu->arch)) {
120 if (cpu_has_ufr)
121 mask |= MIPS_CONF5_UFR;
122 if (cpu_has_fre)
123 mask |= MIPS_CONF5_FRE | MIPS_CONF5_UFE;
124 }
125
126 return mask;
127}
128
129/*
130 * VZ optionally allows these additional Config bits to be written by root:
131 * Config: M, [MT]
132 * Config1: M, [MMUSize-1, C2, MD, PC, WR, CA], FP
133 * Config2: M
134 * Config3: M, MSAP, [BPG], ULRI, [DSP2P, DSPP], CTXTC, [ITL, LPA, VEIC,
135 * VInt, SP, CDMM, MT, SM, TL]
136 * Config4: M, [VTLBSizeExt, MMUSizeExt]
137 * Config5: MRP
138 */
139
140static inline unsigned int kvm_vz_config_user_wrmask(struct kvm_vcpu *vcpu)
141{
142 return kvm_vz_config_guest_wrmask(vcpu) | MIPS_CONF_M;
143}
144
145static inline unsigned int kvm_vz_config1_user_wrmask(struct kvm_vcpu *vcpu)
146{
147 unsigned int mask = kvm_vz_config1_guest_wrmask(vcpu) | MIPS_CONF_M;
148
149 /* Permit FPU to be present if FPU is supported */
150 if (kvm_mips_guest_can_have_fpu(&vcpu->arch))
151 mask |= MIPS_CONF1_FP;
152
153 return mask;
154}
155
156static inline unsigned int kvm_vz_config2_user_wrmask(struct kvm_vcpu *vcpu)
157{
158 return kvm_vz_config2_guest_wrmask(vcpu) | MIPS_CONF_M;
159}
160
161static inline unsigned int kvm_vz_config3_user_wrmask(struct kvm_vcpu *vcpu)
162{
163 unsigned int mask = kvm_vz_config3_guest_wrmask(vcpu) | MIPS_CONF_M |
164 MIPS_CONF3_ULRI | MIPS_CONF3_CTXTC;
165
166 /* Permit MSA to be present if MSA is supported */
167 if (kvm_mips_guest_can_have_msa(&vcpu->arch))
168 mask |= MIPS_CONF3_MSA;
169
170 return mask;
171}
172
173static inline unsigned int kvm_vz_config4_user_wrmask(struct kvm_vcpu *vcpu)
174{
175 return kvm_vz_config4_guest_wrmask(vcpu) | MIPS_CONF_M;
176}
177
178static inline unsigned int kvm_vz_config5_user_wrmask(struct kvm_vcpu *vcpu)
179{
180 return kvm_vz_config5_guest_wrmask(vcpu) | MIPS_CONF5_MRP;
181}
182
183static gpa_t kvm_vz_gva_to_gpa_cb(gva_t gva)
184{
185 /* VZ guest has already converted gva to gpa */
186 return gva;
187}
188
189static void kvm_vz_queue_irq(struct kvm_vcpu *vcpu, unsigned int priority)
190{
191 set_bit(priority, &vcpu->arch.pending_exceptions);
192 clear_bit(priority, &vcpu->arch.pending_exceptions_clr);
193}
194
195static void kvm_vz_dequeue_irq(struct kvm_vcpu *vcpu, unsigned int priority)
196{
197 clear_bit(priority, &vcpu->arch.pending_exceptions);
198 set_bit(priority, &vcpu->arch.pending_exceptions_clr);
199}
200
201static void kvm_vz_queue_timer_int_cb(struct kvm_vcpu *vcpu)
202{
203 /*
204 * timer expiry is asynchronous to vcpu execution therefore defer guest
205 * cp0 accesses
206 */
207 kvm_vz_queue_irq(vcpu, MIPS_EXC_INT_TIMER);
208}
209
210static void kvm_vz_dequeue_timer_int_cb(struct kvm_vcpu *vcpu)
211{
212 /*
213 * timer expiry is asynchronous to vcpu execution therefore defer guest
214 * cp0 accesses
215 */
216 kvm_vz_dequeue_irq(vcpu, MIPS_EXC_INT_TIMER);
217}
218
219static void kvm_vz_queue_io_int_cb(struct kvm_vcpu *vcpu,
220 struct kvm_mips_interrupt *irq)
221{
222 int intr = (int)irq->irq;
223
224 /*
225 * interrupts are asynchronous to vcpu execution therefore defer guest
226 * cp0 accesses
227 */
228 switch (intr) {
229 case 2:
230 kvm_vz_queue_irq(vcpu, MIPS_EXC_INT_IO);
231 break;
232
233 case 3:
234 kvm_vz_queue_irq(vcpu, MIPS_EXC_INT_IPI_1);
235 break;
236
237 case 4:
238 kvm_vz_queue_irq(vcpu, MIPS_EXC_INT_IPI_2);
239 break;
240
241 default:
242 break;
243 }
244
245}
246
247static void kvm_vz_dequeue_io_int_cb(struct kvm_vcpu *vcpu,
248 struct kvm_mips_interrupt *irq)
249{
250 int intr = (int)irq->irq;
251
252 /*
253 * interrupts are asynchronous to vcpu execution therefore defer guest
254 * cp0 accesses
255 */
256 switch (intr) {
257 case -2:
258 kvm_vz_dequeue_irq(vcpu, MIPS_EXC_INT_IO);
259 break;
260
261 case -3:
262 kvm_vz_dequeue_irq(vcpu, MIPS_EXC_INT_IPI_1);
263 break;
264
265 case -4:
266 kvm_vz_dequeue_irq(vcpu, MIPS_EXC_INT_IPI_2);
267 break;
268
269 default:
270 break;
271 }
272
273}
274
275static u32 kvm_vz_priority_to_irq[MIPS_EXC_MAX] = {
276 [MIPS_EXC_INT_TIMER] = C_IRQ5,
277 [MIPS_EXC_INT_IO] = C_IRQ0,
278 [MIPS_EXC_INT_IPI_1] = C_IRQ1,
279 [MIPS_EXC_INT_IPI_2] = C_IRQ2,
280};
281
282static int kvm_vz_irq_deliver_cb(struct kvm_vcpu *vcpu, unsigned int priority,
283 u32 cause)
284{
285 u32 irq = (priority < MIPS_EXC_MAX) ?
286 kvm_vz_priority_to_irq[priority] : 0;
287
288 switch (priority) {
289 case MIPS_EXC_INT_TIMER:
290 set_gc0_cause(C_TI);
291 break;
292
293 case MIPS_EXC_INT_IO:
294 case MIPS_EXC_INT_IPI_1:
295 case MIPS_EXC_INT_IPI_2:
296 if (cpu_has_guestctl2)
297 set_c0_guestctl2(irq);
298 else
299 set_gc0_cause(irq);
300 break;
301
302 default:
303 break;
304 }
305
306 clear_bit(priority, &vcpu->arch.pending_exceptions);
307 return 1;
308}
309
310static int kvm_vz_irq_clear_cb(struct kvm_vcpu *vcpu, unsigned int priority,
311 u32 cause)
312{
313 u32 irq = (priority < MIPS_EXC_MAX) ?
314 kvm_vz_priority_to_irq[priority] : 0;
315
316 switch (priority) {
317 case MIPS_EXC_INT_TIMER:
318 /*
319 * Call to kvm_write_c0_guest_compare() clears Cause.TI in
320 * kvm_mips_emulate_CP0(). Explicitly clear irq associated with
321 * Cause.IP[IPTI] if GuestCtl2 virtual interrupt register not
322 * supported or if not using GuestCtl2 Hardware Clear.
323 */
324 if (cpu_has_guestctl2) {
325 if (!(read_c0_guestctl2() & (irq << 14)))
326 clear_c0_guestctl2(irq);
327 } else {
328 clear_gc0_cause(irq);
329 }
330 break;
331
332 case MIPS_EXC_INT_IO:
333 case MIPS_EXC_INT_IPI_1:
334 case MIPS_EXC_INT_IPI_2:
335 /* Clear GuestCtl2.VIP irq if not using Hardware Clear */
336 if (cpu_has_guestctl2) {
337 if (!(read_c0_guestctl2() & (irq << 14)))
338 clear_c0_guestctl2(irq);
339 } else {
340 clear_gc0_cause(irq);
341 }
342 break;
343
344 default:
345 break;
346 }
347
348 clear_bit(priority, &vcpu->arch.pending_exceptions_clr);
349 return 1;
350}
351
352/*
353 * VZ guest timer handling.
354 */
355
356/**
357 * kvm_vz_should_use_htimer() - Find whether to use the VZ hard guest timer.
358 * @vcpu: Virtual CPU.
359 *
360 * Returns: true if the VZ GTOffset & real guest CP0_Count should be used
361 * instead of software emulation of guest timer.
362 * false otherwise.
363 */
364static bool kvm_vz_should_use_htimer(struct kvm_vcpu *vcpu)
365{
366 if (kvm_mips_count_disabled(vcpu))
367 return false;
368
369 /* Chosen frequency must match real frequency */
370 if (mips_hpt_frequency != vcpu->arch.count_hz)
371 return false;
372
373 /* We don't support a CP0_GTOffset with fewer bits than CP0_Count */
374 if (current_cpu_data.gtoffset_mask != 0xffffffff)
375 return false;
376
377 return true;
378}
379
380/**
381 * _kvm_vz_restore_stimer() - Restore soft timer state.
382 * @vcpu: Virtual CPU.
383 * @compare: CP0_Compare register value, restored by caller.
384 * @cause: CP0_Cause register to restore.
385 *
386 * Restore VZ state relating to the soft timer. The hard timer can be enabled
387 * later.
388 */
389static void _kvm_vz_restore_stimer(struct kvm_vcpu *vcpu, u32 compare,
390 u32 cause)
391{
392 /*
393 * Avoid spurious counter interrupts by setting Guest CP0_Count to just
394 * after Guest CP0_Compare.
395 */
396 write_c0_gtoffset(compare - read_c0_count());
397
398 back_to_back_c0_hazard();
399 write_gc0_cause(cause);
400}
401
402/**
403 * _kvm_vz_restore_htimer() - Restore hard timer state.
404 * @vcpu: Virtual CPU.
405 * @compare: CP0_Compare register value, restored by caller.
406 * @cause: CP0_Cause register to restore.
407 *
408 * Restore hard timer Guest.Count & Guest.Cause taking care to preserve the
409 * value of Guest.CP0_Cause.TI while restoring Guest.CP0_Cause.
410 */
411static void _kvm_vz_restore_htimer(struct kvm_vcpu *vcpu,
412 u32 compare, u32 cause)
413{
414 u32 start_count, after_count;
415 ktime_t freeze_time;
416 unsigned long flags;
417
418 /*
419 * Freeze the soft-timer and sync the guest CP0_Count with it. We do
420 * this with interrupts disabled to avoid latency.
421 */
422 local_irq_save(flags);
423 freeze_time = kvm_mips_freeze_hrtimer(vcpu, &start_count);
424 write_c0_gtoffset(start_count - read_c0_count());
425 local_irq_restore(flags);
426
427 /* restore guest CP0_Cause, as TI may already be set */
428 back_to_back_c0_hazard();
429 write_gc0_cause(cause);
430
431 /*
432 * The above sequence isn't atomic and would result in lost timer
433 * interrupts if we're not careful. Detect if a timer interrupt is due
434 * and assert it.
435 */
436 back_to_back_c0_hazard();
437 after_count = read_gc0_count();
438 if (after_count - start_count > compare - start_count - 1)
439 kvm_vz_queue_irq(vcpu, MIPS_EXC_INT_TIMER);
440}
441
442/**
443 * kvm_vz_restore_timer() - Restore timer state.
444 * @vcpu: Virtual CPU.
445 *
446 * Restore soft timer state from saved context.
447 */
448static void kvm_vz_restore_timer(struct kvm_vcpu *vcpu)
449{
450 struct mips_coproc *cop0 = vcpu->arch.cop0;
451 u32 cause, compare;
452
453 compare = kvm_read_sw_gc0_compare(cop0);
454 cause = kvm_read_sw_gc0_cause(cop0);
455
456 write_gc0_compare(compare);
457 _kvm_vz_restore_stimer(vcpu, compare, cause);
458}
459
460/**
461 * kvm_vz_acquire_htimer() - Switch to hard timer state.
462 * @vcpu: Virtual CPU.
463 *
464 * Restore hard timer state on top of existing soft timer state if possible.
465 *
466 * Since hard timer won't remain active over preemption, preemption should be
467 * disabled by the caller.
468 */
469void kvm_vz_acquire_htimer(struct kvm_vcpu *vcpu)
470{
471 u32 gctl0;
472
473 gctl0 = read_c0_guestctl0();
474 if (!(gctl0 & MIPS_GCTL0_GT) && kvm_vz_should_use_htimer(vcpu)) {
475 /* enable guest access to hard timer */
476 write_c0_guestctl0(gctl0 | MIPS_GCTL0_GT);
477
478 _kvm_vz_restore_htimer(vcpu, read_gc0_compare(),
479 read_gc0_cause());
480 }
481}
482
483/**
484 * _kvm_vz_save_htimer() - Switch to software emulation of guest timer.
485 * @vcpu: Virtual CPU.
486 * @compare: Pointer to write compare value to.
487 * @cause: Pointer to write cause value to.
488 *
489 * Save VZ guest timer state and switch to software emulation of guest CP0
490 * timer. The hard timer must already be in use, so preemption should be
491 * disabled.
492 */
493static void _kvm_vz_save_htimer(struct kvm_vcpu *vcpu,
494 u32 *out_compare, u32 *out_cause)
495{
496 u32 cause, compare, before_count, end_count;
497 ktime_t before_time;
498
499 compare = read_gc0_compare();
500 *out_compare = compare;
501
502 before_time = ktime_get();
503
504 /*
505 * Record the CP0_Count *prior* to saving CP0_Cause, so we have a time
506 * at which no pending timer interrupt is missing.
507 */
508 before_count = read_gc0_count();
509 back_to_back_c0_hazard();
510 cause = read_gc0_cause();
511 *out_cause = cause;
512
513 /*
514 * Record a final CP0_Count which we will transfer to the soft-timer.
515 * This is recorded *after* saving CP0_Cause, so we don't get any timer
516 * interrupts from just after the final CP0_Count point.
517 */
518 back_to_back_c0_hazard();
519 end_count = read_gc0_count();
520
521 /*
522 * The above sequence isn't atomic, so we could miss a timer interrupt
523 * between reading CP0_Cause and end_count. Detect and record any timer
524 * interrupt due between before_count and end_count.
525 */
526 if (end_count - before_count > compare - before_count - 1)
527 kvm_vz_queue_irq(vcpu, MIPS_EXC_INT_TIMER);
528
529 /*
530 * Restore soft-timer, ignoring a small amount of negative drift due to
531 * delay between freeze_hrtimer and setting CP0_GTOffset.
532 */
533 kvm_mips_restore_hrtimer(vcpu, before_time, end_count, -0x10000);
534}
535
536/**
537 * kvm_vz_save_timer() - Save guest timer state.
538 * @vcpu: Virtual CPU.
539 *
540 * Save VZ guest timer state and switch to soft guest timer if hard timer was in
541 * use.
542 */
543static void kvm_vz_save_timer(struct kvm_vcpu *vcpu)
544{
545 struct mips_coproc *cop0 = vcpu->arch.cop0;
546 u32 gctl0, compare, cause;
547
548 gctl0 = read_c0_guestctl0();
549 if (gctl0 & MIPS_GCTL0_GT) {
550 /* disable guest use of hard timer */
551 write_c0_guestctl0(gctl0 & ~MIPS_GCTL0_GT);
552
553 /* save hard timer state */
554 _kvm_vz_save_htimer(vcpu, &compare, &cause);
555 } else {
556 compare = read_gc0_compare();
557 cause = read_gc0_cause();
558 }
559
560 /* save timer-related state to VCPU context */
561 kvm_write_sw_gc0_cause(cop0, cause);
562 kvm_write_sw_gc0_compare(cop0, compare);
563}
564
565/**
566 * kvm_vz_lose_htimer() - Ensure hard guest timer is not in use.
567 * @vcpu: Virtual CPU.
568 *
569 * Transfers the state of the hard guest timer to the soft guest timer, leaving
570 * guest state intact so it can continue to be used with the soft timer.
571 */
572void kvm_vz_lose_htimer(struct kvm_vcpu *vcpu)
573{
574 u32 gctl0, compare, cause;
575
576 preempt_disable();
577 gctl0 = read_c0_guestctl0();
578 if (gctl0 & MIPS_GCTL0_GT) {
579 /* disable guest use of timer */
580 write_c0_guestctl0(gctl0 & ~MIPS_GCTL0_GT);
581
582 /* switch to soft timer */
583 _kvm_vz_save_htimer(vcpu, &compare, &cause);
584
585 /* leave soft timer in usable state */
586 _kvm_vz_restore_stimer(vcpu, compare, cause);
587 }
588 preempt_enable();
589}
590
591/**
592 * is_eva_access() - Find whether an instruction is an EVA memory accessor.
593 * @inst: 32-bit instruction encoding.
594 *
595 * Finds whether @inst encodes an EVA memory access instruction, which would
596 * indicate that emulation of it should access the user mode address space
597 * instead of the kernel mode address space. This matters for MUSUK segments
598 * which are TLB mapped for user mode but unmapped for kernel mode.
599 *
600 * Returns: Whether @inst encodes an EVA accessor instruction.
601 */
602static bool is_eva_access(union mips_instruction inst)
603{
604 if (inst.spec3_format.opcode != spec3_op)
605 return false;
606
607 switch (inst.spec3_format.func) {
608 case lwle_op:
609 case lwre_op:
610 case cachee_op:
611 case sbe_op:
612 case she_op:
613 case sce_op:
614 case swe_op:
615 case swle_op:
616 case swre_op:
617 case prefe_op:
618 case lbue_op:
619 case lhue_op:
620 case lbe_op:
621 case lhe_op:
622 case lle_op:
623 case lwe_op:
624 return true;
625 default:
626 return false;
627 }
628}
629
630/**
631 * is_eva_am_mapped() - Find whether an access mode is mapped.
632 * @vcpu: KVM VCPU state.
633 * @am: 3-bit encoded access mode.
634 * @eu: Segment becomes unmapped and uncached when Status.ERL=1.
635 *
636 * Decode @am to find whether it encodes a mapped segment for the current VCPU
637 * state. Where necessary @eu and the actual instruction causing the fault are
638 * taken into account to make the decision.
639 *
640 * Returns: Whether the VCPU faulted on a TLB mapped address.
641 */
642static bool is_eva_am_mapped(struct kvm_vcpu *vcpu, unsigned int am, bool eu)
643{
644 u32 am_lookup;
645 int err;
646
647 /*
648 * Interpret access control mode. We assume address errors will already
649 * have been caught by the guest, leaving us with:
650 * AM UM SM KM 31..24 23..16
651 * UK 0 000 Unm 0 0
652 * MK 1 001 TLB 1
653 * MSK 2 010 TLB TLB 1
654 * MUSK 3 011 TLB TLB TLB 1
655 * MUSUK 4 100 TLB TLB Unm 0 1
656 * USK 5 101 Unm Unm 0 0
657 * - 6 110 0 0
658 * UUSK 7 111 Unm Unm Unm 0 0
659 *
660 * We shift a magic value by AM across the sign bit to find if always
661 * TLB mapped, and if not shift by 8 again to find if it depends on KM.
662 */
663 am_lookup = 0x70080000 << am;
664 if ((s32)am_lookup < 0) {
665 /*
666 * MK, MSK, MUSK
667 * Always TLB mapped, unless SegCtl.EU && ERL
668 */
669 if (!eu || !(read_gc0_status() & ST0_ERL))
670 return true;
671 } else {
672 am_lookup <<= 8;
673 if ((s32)am_lookup < 0) {
674 union mips_instruction inst;
675 unsigned int status;
676 u32 *opc;
677
678 /*
679 * MUSUK
680 * TLB mapped if not in kernel mode
681 */
682 status = read_gc0_status();
683 if (!(status & (ST0_EXL | ST0_ERL)) &&
684 (status & ST0_KSU))
685 return true;
686 /*
687 * EVA access instructions in kernel
688 * mode access user address space.
689 */
690 opc = (u32 *)vcpu->arch.pc;
691 if (vcpu->arch.host_cp0_cause & CAUSEF_BD)
692 opc += 1;
693 err = kvm_get_badinstr(opc, vcpu, &inst.word);
694 if (!err && is_eva_access(inst))
695 return true;
696 }
697 }
698
699 return false;
700}
701
702/**
703 * kvm_vz_gva_to_gpa() - Convert valid GVA to GPA.
704 * @vcpu: KVM VCPU state.
705 * @gva: Guest virtual address to convert.
706 * @gpa: Output guest physical address.
707 *
708 * Convert a guest virtual address (GVA) which is valid according to the guest
709 * context, to a guest physical address (GPA).
710 *
711 * Returns: 0 on success.
712 * -errno on failure.
713 */
714static int kvm_vz_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva,
715 unsigned long *gpa)
716{
717 u32 gva32 = gva;
718 unsigned long segctl;
719
720 if ((long)gva == (s32)gva32) {
721 /* Handle canonical 32-bit virtual address */
722 if (cpu_guest_has_segments) {
723 unsigned long mask, pa;
724
725 switch (gva32 >> 29) {
726 case 0:
727 case 1: /* CFG5 (1GB) */
728 segctl = read_gc0_segctl2() >> 16;
729 mask = (unsigned long)0xfc0000000ull;
730 break;
731 case 2:
732 case 3: /* CFG4 (1GB) */
733 segctl = read_gc0_segctl2();
734 mask = (unsigned long)0xfc0000000ull;
735 break;
736 case 4: /* CFG3 (512MB) */
737 segctl = read_gc0_segctl1() >> 16;
738 mask = (unsigned long)0xfe0000000ull;
739 break;
740 case 5: /* CFG2 (512MB) */
741 segctl = read_gc0_segctl1();
742 mask = (unsigned long)0xfe0000000ull;
743 break;
744 case 6: /* CFG1 (512MB) */
745 segctl = read_gc0_segctl0() >> 16;
746 mask = (unsigned long)0xfe0000000ull;
747 break;
748 case 7: /* CFG0 (512MB) */
749 segctl = read_gc0_segctl0();
750 mask = (unsigned long)0xfe0000000ull;
751 break;
752 default:
753 /*
754 * GCC 4.9 isn't smart enough to figure out that
755 * segctl and mask are always initialised.
756 */
757 unreachable();
758 }
759
760 if (is_eva_am_mapped(vcpu, (segctl >> 4) & 0x7,
761 segctl & 0x0008))
762 goto tlb_mapped;
763
764 /* Unmapped, find guest physical address */
765 pa = (segctl << 20) & mask;
766 pa |= gva32 & ~mask;
767 *gpa = pa;
768 return 0;
769 } else if ((s32)gva32 < (s32)0xc0000000) {
770 /* legacy unmapped KSeg0 or KSeg1 */
771 *gpa = gva32 & 0x1fffffff;
772 return 0;
773 }
774#ifdef CONFIG_64BIT
775 } else if ((gva & 0xc000000000000000) == 0x8000000000000000) {
776 /* XKPHYS */
777 if (cpu_guest_has_segments) {
778 /*
779 * Each of the 8 regions can be overridden by SegCtl2.XR
780 * to use SegCtl1.XAM.
781 */
782 segctl = read_gc0_segctl2();
783 if (segctl & (1ull << (56 + ((gva >> 59) & 0x7)))) {
784 segctl = read_gc0_segctl1();
785 if (is_eva_am_mapped(vcpu, (segctl >> 59) & 0x7,
786 0))
787 goto tlb_mapped;
788 }
789
790 }
791 /*
792 * Traditionally fully unmapped.
793 * Bits 61:59 specify the CCA, which we can just mask off here.
794 * Bits 58:PABITS should be zero, but we shouldn't have got here
795 * if it wasn't.
796 */
797 *gpa = gva & 0x07ffffffffffffff;
798 return 0;
799#endif
800 }
801
802tlb_mapped:
803 return kvm_vz_guest_tlb_lookup(vcpu, gva, gpa);
804}
805
806/**
807 * kvm_vz_badvaddr_to_gpa() - Convert GVA BadVAddr from root exception to GPA.
808 * @vcpu: KVM VCPU state.
809 * @badvaddr: Root BadVAddr.
810 * @gpa: Output guest physical address.
811 *
812 * VZ implementations are permitted to report guest virtual addresses (GVA) in
813 * BadVAddr on a root exception during guest execution, instead of the more
814 * convenient guest physical addresses (GPA). When we get a GVA, this function
815 * converts it to a GPA, taking into account guest segmentation and guest TLB
816 * state.
817 *
818 * Returns: 0 on success.
819 * -errno on failure.
820 */
821static int kvm_vz_badvaddr_to_gpa(struct kvm_vcpu *vcpu, unsigned long badvaddr,
822 unsigned long *gpa)
823{
824 unsigned int gexccode = (vcpu->arch.host_cp0_guestctl0 &
825 MIPS_GCTL0_GEXC) >> MIPS_GCTL0_GEXC_SHIFT;
826
827 /* If BadVAddr is GPA, then all is well in the world */
828 if (likely(gexccode == MIPS_GCTL0_GEXC_GPA)) {
829 *gpa = badvaddr;
830 return 0;
831 }
832
833 /* Otherwise we'd expect it to be GVA ... */
834 if (WARN(gexccode != MIPS_GCTL0_GEXC_GVA,
835 "Unexpected gexccode %#x\n", gexccode))
836 return -EINVAL;
837
838 /* ... and we need to perform the GVA->GPA translation in software */
839 return kvm_vz_gva_to_gpa(vcpu, badvaddr, gpa);
840}
841
842static int kvm_trap_vz_no_handler(struct kvm_vcpu *vcpu)
843{
844 u32 *opc = (u32 *) vcpu->arch.pc;
845 u32 cause = vcpu->arch.host_cp0_cause;
846 u32 exccode = (cause & CAUSEF_EXCCODE) >> CAUSEB_EXCCODE;
847 unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr;
848 u32 inst = 0;
849
850 /*
851 * Fetch the instruction.
852 */
853 if (cause & CAUSEF_BD)
854 opc += 1;
855 kvm_get_badinstr(opc, vcpu, &inst);
856
857 kvm_err("Exception Code: %d not handled @ PC: %p, inst: 0x%08x BadVaddr: %#lx Status: %#x\n",
858 exccode, opc, inst, badvaddr,
859 read_gc0_status());
860 kvm_arch_vcpu_dump_regs(vcpu);
861 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
862 return RESUME_HOST;
863}
864
865static unsigned long mips_process_maar(unsigned int op, unsigned long val)
866{
867 /* Mask off unused bits */
868 unsigned long mask = 0xfffff000 | MIPS_MAAR_S | MIPS_MAAR_VL;
869
870 if (read_gc0_pagegrain() & PG_ELPA)
871 mask |= 0x00ffffff00000000ull;
872 if (cpu_guest_has_mvh)
873 mask |= MIPS_MAAR_VH;
874
875 /* Set or clear VH */
876 if (op == mtc_op) {
877 /* clear VH */
878 val &= ~MIPS_MAAR_VH;
879 } else if (op == dmtc_op) {
880 /* set VH to match VL */
881 val &= ~MIPS_MAAR_VH;
882 if (val & MIPS_MAAR_VL)
883 val |= MIPS_MAAR_VH;
884 }
885
886 return val & mask;
887}
888
889static void kvm_write_maari(struct kvm_vcpu *vcpu, unsigned long val)
890{
891 struct mips_coproc *cop0 = vcpu->arch.cop0;
892
893 val &= MIPS_MAARI_INDEX;
894 if (val == MIPS_MAARI_INDEX)
895 kvm_write_sw_gc0_maari(cop0, ARRAY_SIZE(vcpu->arch.maar) - 1);
896 else if (val < ARRAY_SIZE(vcpu->arch.maar))
897 kvm_write_sw_gc0_maari(cop0, val);
898}
899
900static enum emulation_result kvm_vz_gpsi_cop0(union mips_instruction inst,
901 u32 *opc, u32 cause,
902 struct kvm_run *run,
903 struct kvm_vcpu *vcpu)
904{
905 struct mips_coproc *cop0 = vcpu->arch.cop0;
906 enum emulation_result er = EMULATE_DONE;
907 u32 rt, rd, sel;
908 unsigned long curr_pc;
909 unsigned long val;
910
911 /*
912 * Update PC and hold onto current PC in case there is
913 * an error and we want to rollback the PC
914 */
915 curr_pc = vcpu->arch.pc;
916 er = update_pc(vcpu, cause);
917 if (er == EMULATE_FAIL)
918 return er;
919
920 if (inst.co_format.co) {
921 switch (inst.co_format.func) {
922 case wait_op:
923 er = kvm_mips_emul_wait(vcpu);
924 break;
925 default:
926 er = EMULATE_FAIL;
927 }
928 } else {
929 rt = inst.c0r_format.rt;
930 rd = inst.c0r_format.rd;
931 sel = inst.c0r_format.sel;
932
933 switch (inst.c0r_format.rs) {
934 case dmfc_op:
935 case mfc_op:
936#ifdef CONFIG_KVM_MIPS_DEBUG_COP0_COUNTERS
937 cop0->stat[rd][sel]++;
938#endif
939 if (rd == MIPS_CP0_COUNT &&
940 sel == 0) { /* Count */
941 val = kvm_mips_read_count(vcpu);
942 } else if (rd == MIPS_CP0_COMPARE &&
943 sel == 0) { /* Compare */
944 val = read_gc0_compare();
945 } else if (rd == MIPS_CP0_LLADDR &&
946 sel == 0) { /* LLAddr */
947 if (cpu_guest_has_rw_llb)
948 val = read_gc0_lladdr() &
949 MIPS_LLADDR_LLB;
950 else
951 val = 0;
952 } else if (rd == MIPS_CP0_LLADDR &&
953 sel == 1 && /* MAAR */
954 cpu_guest_has_maar &&
955 !cpu_guest_has_dyn_maar) {
956 /* MAARI must be in range */
957 BUG_ON(kvm_read_sw_gc0_maari(cop0) >=
958 ARRAY_SIZE(vcpu->arch.maar));
959 val = vcpu->arch.maar[
960 kvm_read_sw_gc0_maari(cop0)];
961 } else if ((rd == MIPS_CP0_PRID &&
962 (sel == 0 || /* PRid */
963 sel == 2 || /* CDMMBase */
964 sel == 3)) || /* CMGCRBase */
965 (rd == MIPS_CP0_STATUS &&
966 (sel == 2 || /* SRSCtl */
967 sel == 3)) || /* SRSMap */
968 (rd == MIPS_CP0_CONFIG &&
969 (sel == 7)) || /* Config7 */
970 (rd == MIPS_CP0_LLADDR &&
971 (sel == 2) && /* MAARI */
972 cpu_guest_has_maar &&
973 !cpu_guest_has_dyn_maar) ||
974 (rd == MIPS_CP0_ERRCTL &&
975 (sel == 0))) { /* ErrCtl */
976 val = cop0->reg[rd][sel];
977 } else {
978 val = 0;
979 er = EMULATE_FAIL;
980 }
981
982 if (er != EMULATE_FAIL) {
983 /* Sign extend */
984 if (inst.c0r_format.rs == mfc_op)
985 val = (int)val;
986 vcpu->arch.gprs[rt] = val;
987 }
988
989 trace_kvm_hwr(vcpu, (inst.c0r_format.rs == mfc_op) ?
990 KVM_TRACE_MFC0 : KVM_TRACE_DMFC0,
991 KVM_TRACE_COP0(rd, sel), val);
992 break;
993
994 case dmtc_op:
995 case mtc_op:
996#ifdef CONFIG_KVM_MIPS_DEBUG_COP0_COUNTERS
997 cop0->stat[rd][sel]++;
998#endif
999 val = vcpu->arch.gprs[rt];
1000 trace_kvm_hwr(vcpu, (inst.c0r_format.rs == mtc_op) ?
1001 KVM_TRACE_MTC0 : KVM_TRACE_DMTC0,
1002 KVM_TRACE_COP0(rd, sel), val);
1003
1004 if (rd == MIPS_CP0_COUNT &&
1005 sel == 0) { /* Count */
1006 kvm_vz_lose_htimer(vcpu);
1007 kvm_mips_write_count(vcpu, vcpu->arch.gprs[rt]);
1008 } else if (rd == MIPS_CP0_COMPARE &&
1009 sel == 0) { /* Compare */
1010 kvm_mips_write_compare(vcpu,
1011 vcpu->arch.gprs[rt],
1012 true);
1013 } else if (rd == MIPS_CP0_LLADDR &&
1014 sel == 0) { /* LLAddr */
1015 /*
1016 * P5600 generates GPSI on guest MTC0 LLAddr.
1017 * Only allow the guest to clear LLB.
1018 */
1019 if (cpu_guest_has_rw_llb &&
1020 !(val & MIPS_LLADDR_LLB))
1021 write_gc0_lladdr(0);
1022 } else if (rd == MIPS_CP0_LLADDR &&
1023 sel == 1 && /* MAAR */
1024 cpu_guest_has_maar &&
1025 !cpu_guest_has_dyn_maar) {
1026 val = mips_process_maar(inst.c0r_format.rs,
1027 val);
1028
1029 /* MAARI must be in range */
1030 BUG_ON(kvm_read_sw_gc0_maari(cop0) >=
1031 ARRAY_SIZE(vcpu->arch.maar));
1032 vcpu->arch.maar[kvm_read_sw_gc0_maari(cop0)] =
1033 val;
1034 } else if (rd == MIPS_CP0_LLADDR &&
1035 (sel == 2) && /* MAARI */
1036 cpu_guest_has_maar &&
1037 !cpu_guest_has_dyn_maar) {
1038 kvm_write_maari(vcpu, val);
1039 } else if (rd == MIPS_CP0_ERRCTL &&
1040 (sel == 0)) { /* ErrCtl */
1041 /* ignore the written value */
1042 } else {
1043 er = EMULATE_FAIL;
1044 }
1045 break;
1046
1047 default:
1048 er = EMULATE_FAIL;
1049 break;
1050 }
1051 }
1052 /* Rollback PC only if emulation was unsuccessful */
1053 if (er == EMULATE_FAIL) {
1054 kvm_err("[%#lx]%s: unsupported cop0 instruction 0x%08x\n",
1055 curr_pc, __func__, inst.word);
1056
1057 vcpu->arch.pc = curr_pc;
1058 }
1059
1060 return er;
1061}
1062
1063static enum emulation_result kvm_vz_gpsi_cache(union mips_instruction inst,
1064 u32 *opc, u32 cause,
1065 struct kvm_run *run,
1066 struct kvm_vcpu *vcpu)
1067{
1068 enum emulation_result er = EMULATE_DONE;
1069 u32 cache, op_inst, op, base;
1070 s16 offset;
1071 struct kvm_vcpu_arch *arch = &vcpu->arch;
1072 unsigned long va, curr_pc;
1073
1074 /*
1075 * Update PC and hold onto current PC in case there is
1076 * an error and we want to rollback the PC
1077 */
1078 curr_pc = vcpu->arch.pc;
1079 er = update_pc(vcpu, cause);
1080 if (er == EMULATE_FAIL)
1081 return er;
1082
1083 base = inst.i_format.rs;
1084 op_inst = inst.i_format.rt;
1085 if (cpu_has_mips_r6)
1086 offset = inst.spec3_format.simmediate;
1087 else
1088 offset = inst.i_format.simmediate;
1089 cache = op_inst & CacheOp_Cache;
1090 op = op_inst & CacheOp_Op;
1091
1092 va = arch->gprs[base] + offset;
1093
1094 kvm_debug("CACHE (cache: %#x, op: %#x, base[%d]: %#lx, offset: %#x\n",
1095 cache, op, base, arch->gprs[base], offset);
1096
1097 /* Secondary or tirtiary cache ops ignored */
1098 if (cache != Cache_I && cache != Cache_D)
1099 return EMULATE_DONE;
1100
1101 switch (op_inst) {
1102 case Index_Invalidate_I:
1103 flush_icache_line_indexed(va);
1104 return EMULATE_DONE;
1105 case Index_Writeback_Inv_D:
1106 flush_dcache_line_indexed(va);
1107 return EMULATE_DONE;
1108 case Hit_Invalidate_I:
1109 case Hit_Invalidate_D:
1110 case Hit_Writeback_Inv_D:
1111 if (boot_cpu_type() == CPU_CAVIUM_OCTEON3) {
1112 /* We can just flush entire icache */
1113 local_flush_icache_range(0, 0);
1114 return EMULATE_DONE;
1115 }
1116
1117 /* So far, other platforms support guest hit cache ops */
1118 break;
1119 default:
1120 break;
1121 };
1122
1123 kvm_err("@ %#lx/%#lx CACHE (cache: %#x, op: %#x, base[%d]: %#lx, offset: %#x\n",
1124 curr_pc, vcpu->arch.gprs[31], cache, op, base, arch->gprs[base],
1125 offset);
1126 /* Rollback PC */
1127 vcpu->arch.pc = curr_pc;
1128
1129 return EMULATE_FAIL;
1130}
1131
1132static enum emulation_result kvm_trap_vz_handle_gpsi(u32 cause, u32 *opc,
1133 struct kvm_vcpu *vcpu)
1134{
1135 enum emulation_result er = EMULATE_DONE;
1136 struct kvm_vcpu_arch *arch = &vcpu->arch;
1137 struct kvm_run *run = vcpu->run;
1138 union mips_instruction inst;
1139 int rd, rt, sel;
1140 int err;
1141
1142 /*
1143 * Fetch the instruction.
1144 */
1145 if (cause & CAUSEF_BD)
1146 opc += 1;
1147 err = kvm_get_badinstr(opc, vcpu, &inst.word);
1148 if (err)
1149 return EMULATE_FAIL;
1150
1151 switch (inst.r_format.opcode) {
1152 case cop0_op:
1153 er = kvm_vz_gpsi_cop0(inst, opc, cause, run, vcpu);
1154 break;
1155#ifndef CONFIG_CPU_MIPSR6
1156 case cache_op:
1157 trace_kvm_exit(vcpu, KVM_TRACE_EXIT_CACHE);
1158 er = kvm_vz_gpsi_cache(inst, opc, cause, run, vcpu);
1159 break;
1160#endif
1161 case spec3_op:
1162 switch (inst.spec3_format.func) {
1163#ifdef CONFIG_CPU_MIPSR6
1164 case cache6_op:
1165 trace_kvm_exit(vcpu, KVM_TRACE_EXIT_CACHE);
1166 er = kvm_vz_gpsi_cache(inst, opc, cause, run, vcpu);
1167 break;
1168#endif
1169 case rdhwr_op:
1170 if (inst.r_format.rs || (inst.r_format.re >> 3))
1171 goto unknown;
1172
1173 rd = inst.r_format.rd;
1174 rt = inst.r_format.rt;
1175 sel = inst.r_format.re & 0x7;
1176
1177 switch (rd) {
1178 case MIPS_HWR_CC: /* Read count register */
1179 arch->gprs[rt] =
1180 (long)(int)kvm_mips_read_count(vcpu);
1181 break;
1182 default:
1183 trace_kvm_hwr(vcpu, KVM_TRACE_RDHWR,
1184 KVM_TRACE_HWR(rd, sel), 0);
1185 goto unknown;
1186 };
1187
1188 trace_kvm_hwr(vcpu, KVM_TRACE_RDHWR,
1189 KVM_TRACE_HWR(rd, sel), arch->gprs[rt]);
1190
1191 er = update_pc(vcpu, cause);
1192 break;
1193 default:
1194 goto unknown;
1195 };
1196 break;
1197unknown:
1198
1199 default:
1200 kvm_err("GPSI exception not supported (%p/%#x)\n",
1201 opc, inst.word);
1202 kvm_arch_vcpu_dump_regs(vcpu);
1203 er = EMULATE_FAIL;
1204 break;
1205 }
1206
1207 return er;
1208}
1209
1210static enum emulation_result kvm_trap_vz_handle_gsfc(u32 cause, u32 *opc,
1211 struct kvm_vcpu *vcpu)
1212{
1213 enum emulation_result er = EMULATE_DONE;
1214 struct kvm_vcpu_arch *arch = &vcpu->arch;
1215 union mips_instruction inst;
1216 int err;
1217
1218 /*
1219 * Fetch the instruction.
1220 */
1221 if (cause & CAUSEF_BD)
1222 opc += 1;
1223 err = kvm_get_badinstr(opc, vcpu, &inst.word);
1224 if (err)
1225 return EMULATE_FAIL;
1226
1227 /* complete MTC0 on behalf of guest and advance EPC */
1228 if (inst.c0r_format.opcode == cop0_op &&
1229 inst.c0r_format.rs == mtc_op &&
1230 inst.c0r_format.z == 0) {
1231 int rt = inst.c0r_format.rt;
1232 int rd = inst.c0r_format.rd;
1233 int sel = inst.c0r_format.sel;
1234 unsigned int val = arch->gprs[rt];
1235 unsigned int old_val, change;
1236
1237 trace_kvm_hwr(vcpu, KVM_TRACE_MTC0, KVM_TRACE_COP0(rd, sel),
1238 val);
1239
1240 if ((rd == MIPS_CP0_STATUS) && (sel == 0)) {
1241 /* FR bit should read as zero if no FPU */
1242 if (!kvm_mips_guest_has_fpu(&vcpu->arch))
1243 val &= ~(ST0_CU1 | ST0_FR);
1244
1245 /*
1246 * Also don't allow FR to be set if host doesn't support
1247 * it.
1248 */
1249 if (!(boot_cpu_data.fpu_id & MIPS_FPIR_F64))
1250 val &= ~ST0_FR;
1251
1252 old_val = read_gc0_status();
1253 change = val ^ old_val;
1254
1255 if (change & ST0_FR) {
1256 /*
1257 * FPU and Vector register state is made
1258 * UNPREDICTABLE by a change of FR, so don't
1259 * even bother saving it.
1260 */
1261 kvm_drop_fpu(vcpu);
1262 }
1263
1264 /*
1265 * If MSA state is already live, it is undefined how it
1266 * interacts with FR=0 FPU state, and we don't want to
1267 * hit reserved instruction exceptions trying to save
1268 * the MSA state later when CU=1 && FR=1, so play it
1269 * safe and save it first.
1270 */
1271 if (change & ST0_CU1 && !(val & ST0_FR) &&
1272 vcpu->arch.aux_inuse & KVM_MIPS_AUX_MSA)
1273 kvm_lose_fpu(vcpu);
1274
1275 write_gc0_status(val);
1276 } else if ((rd == MIPS_CP0_CAUSE) && (sel == 0)) {
1277 u32 old_cause = read_gc0_cause();
1278 u32 change = old_cause ^ val;
1279
1280 /* DC bit enabling/disabling timer? */
1281 if (change & CAUSEF_DC) {
1282 if (val & CAUSEF_DC) {
1283 kvm_vz_lose_htimer(vcpu);
1284 kvm_mips_count_disable_cause(vcpu);
1285 } else {
1286 kvm_mips_count_enable_cause(vcpu);
1287 }
1288 }
1289
1290 /* Only certain bits are RW to the guest */
1291 change &= (CAUSEF_DC | CAUSEF_IV | CAUSEF_WP |
1292 CAUSEF_IP0 | CAUSEF_IP1);
1293
1294 /* WP can only be cleared */
1295 change &= ~CAUSEF_WP | old_cause;
1296
1297 write_gc0_cause(old_cause ^ change);
1298 } else if ((rd == MIPS_CP0_STATUS) && (sel == 1)) { /* IntCtl */
1299 write_gc0_intctl(val);
1300 } else if ((rd == MIPS_CP0_CONFIG) && (sel == 5)) {
1301 old_val = read_gc0_config5();
1302 change = val ^ old_val;
1303 /* Handle changes in FPU/MSA modes */
1304 preempt_disable();
1305
1306 /*
1307 * Propagate FRE changes immediately if the FPU
1308 * context is already loaded.
1309 */
1310 if (change & MIPS_CONF5_FRE &&
1311 vcpu->arch.aux_inuse & KVM_MIPS_AUX_FPU)
1312 change_c0_config5(MIPS_CONF5_FRE, val);
1313
1314 preempt_enable();
1315
1316 val = old_val ^
1317 (change & kvm_vz_config5_guest_wrmask(vcpu));
1318 write_gc0_config5(val);
1319 } else {
1320 kvm_err("Handle GSFC, unsupported field change @ %p: %#x\n",
1321 opc, inst.word);
1322 er = EMULATE_FAIL;
1323 }
1324
1325 if (er != EMULATE_FAIL)
1326 er = update_pc(vcpu, cause);
1327 } else {
1328 kvm_err("Handle GSFC, unrecognized instruction @ %p: %#x\n",
1329 opc, inst.word);
1330 er = EMULATE_FAIL;
1331 }
1332
1333 return er;
1334}
1335
1336static enum emulation_result kvm_trap_vz_handle_ghfc(u32 cause, u32 *opc,
1337 struct kvm_vcpu *vcpu)
1338{
1339 /*
1340 * Presumably this is due to MC (guest mode change), so lets trace some
1341 * relevant info.
1342 */
1343 trace_kvm_guest_mode_change(vcpu);
1344
1345 return EMULATE_DONE;
1346}
1347
1348static enum emulation_result kvm_trap_vz_handle_hc(u32 cause, u32 *opc,
1349 struct kvm_vcpu *vcpu)
1350{
1351 enum emulation_result er;
1352 union mips_instruction inst;
1353 unsigned long curr_pc;
1354 int err;
1355
1356 if (cause & CAUSEF_BD)
1357 opc += 1;
1358 err = kvm_get_badinstr(opc, vcpu, &inst.word);
1359 if (err)
1360 return EMULATE_FAIL;
1361
1362 /*
1363 * Update PC and hold onto current PC in case there is
1364 * an error and we want to rollback the PC
1365 */
1366 curr_pc = vcpu->arch.pc;
1367 er = update_pc(vcpu, cause);
1368 if (er == EMULATE_FAIL)
1369 return er;
1370
1371 er = kvm_mips_emul_hypcall(vcpu, inst);
1372 if (er == EMULATE_FAIL)
1373 vcpu->arch.pc = curr_pc;
1374
1375 return er;
1376}
1377
1378static enum emulation_result kvm_trap_vz_no_handler_guest_exit(u32 gexccode,
1379 u32 cause,
1380 u32 *opc,
1381 struct kvm_vcpu *vcpu)
1382{
1383 u32 inst;
1384
1385 /*
1386 * Fetch the instruction.
1387 */
1388 if (cause & CAUSEF_BD)
1389 opc += 1;
1390 kvm_get_badinstr(opc, vcpu, &inst);
1391
1392 kvm_err("Guest Exception Code: %d not yet handled @ PC: %p, inst: 0x%08x Status: %#x\n",
1393 gexccode, opc, inst, read_gc0_status());
1394
1395 return EMULATE_FAIL;
1396}
1397
1398static int kvm_trap_vz_handle_guest_exit(struct kvm_vcpu *vcpu)
1399{
1400 u32 *opc = (u32 *) vcpu->arch.pc;
1401 u32 cause = vcpu->arch.host_cp0_cause;
1402 enum emulation_result er = EMULATE_DONE;
1403 u32 gexccode = (vcpu->arch.host_cp0_guestctl0 &
1404 MIPS_GCTL0_GEXC) >> MIPS_GCTL0_GEXC_SHIFT;
1405 int ret = RESUME_GUEST;
1406
1407 trace_kvm_exit(vcpu, KVM_TRACE_EXIT_GEXCCODE_BASE + gexccode);
1408 switch (gexccode) {
1409 case MIPS_GCTL0_GEXC_GPSI:
1410 ++vcpu->stat.vz_gpsi_exits;
1411 er = kvm_trap_vz_handle_gpsi(cause, opc, vcpu);
1412 break;
1413 case MIPS_GCTL0_GEXC_GSFC:
1414 ++vcpu->stat.vz_gsfc_exits;
1415 er = kvm_trap_vz_handle_gsfc(cause, opc, vcpu);
1416 break;
1417 case MIPS_GCTL0_GEXC_HC:
1418 ++vcpu->stat.vz_hc_exits;
1419 er = kvm_trap_vz_handle_hc(cause, opc, vcpu);
1420 break;
1421 case MIPS_GCTL0_GEXC_GRR:
1422 ++vcpu->stat.vz_grr_exits;
1423 er = kvm_trap_vz_no_handler_guest_exit(gexccode, cause, opc,
1424 vcpu);
1425 break;
1426 case MIPS_GCTL0_GEXC_GVA:
1427 ++vcpu->stat.vz_gva_exits;
1428 er = kvm_trap_vz_no_handler_guest_exit(gexccode, cause, opc,
1429 vcpu);
1430 break;
1431 case MIPS_GCTL0_GEXC_GHFC:
1432 ++vcpu->stat.vz_ghfc_exits;
1433 er = kvm_trap_vz_handle_ghfc(cause, opc, vcpu);
1434 break;
1435 case MIPS_GCTL0_GEXC_GPA:
1436 ++vcpu->stat.vz_gpa_exits;
1437 er = kvm_trap_vz_no_handler_guest_exit(gexccode, cause, opc,
1438 vcpu);
1439 break;
1440 default:
1441 ++vcpu->stat.vz_resvd_exits;
1442 er = kvm_trap_vz_no_handler_guest_exit(gexccode, cause, opc,
1443 vcpu);
1444 break;
1445
1446 }
1447
1448 if (er == EMULATE_DONE) {
1449 ret = RESUME_GUEST;
1450 } else if (er == EMULATE_HYPERCALL) {
1451 ret = kvm_mips_handle_hypcall(vcpu);
1452 } else {
1453 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1454 ret = RESUME_HOST;
1455 }
1456 return ret;
1457}
1458
1459/**
1460 * kvm_trap_vz_handle_cop_unusuable() - Guest used unusable coprocessor.
1461 * @vcpu: Virtual CPU context.
1462 *
1463 * Handle when the guest attempts to use a coprocessor which hasn't been allowed
1464 * by the root context.
1465 */
1466static int kvm_trap_vz_handle_cop_unusable(struct kvm_vcpu *vcpu)
1467{
1468 struct kvm_run *run = vcpu->run;
1469 u32 cause = vcpu->arch.host_cp0_cause;
1470 enum emulation_result er = EMULATE_FAIL;
1471 int ret = RESUME_GUEST;
1472
1473 if (((cause & CAUSEF_CE) >> CAUSEB_CE) == 1) {
1474 /*
1475 * If guest FPU not present, the FPU operation should have been
1476 * treated as a reserved instruction!
1477 * If FPU already in use, we shouldn't get this at all.
1478 */
1479 if (WARN_ON(!kvm_mips_guest_has_fpu(&vcpu->arch) ||
1480 vcpu->arch.aux_inuse & KVM_MIPS_AUX_FPU)) {
1481 preempt_enable();
1482 return EMULATE_FAIL;
1483 }
1484
1485 kvm_own_fpu(vcpu);
1486 er = EMULATE_DONE;
1487 }
1488 /* other coprocessors not handled */
1489
1490 switch (er) {
1491 case EMULATE_DONE:
1492 ret = RESUME_GUEST;
1493 break;
1494
1495 case EMULATE_FAIL:
1496 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1497 ret = RESUME_HOST;
1498 break;
1499
1500 default:
1501 BUG();
1502 }
1503 return ret;
1504}
1505
1506/**
1507 * kvm_trap_vz_handle_msa_disabled() - Guest used MSA while disabled in root.
1508 * @vcpu: Virtual CPU context.
1509 *
1510 * Handle when the guest attempts to use MSA when it is disabled in the root
1511 * context.
1512 */
1513static int kvm_trap_vz_handle_msa_disabled(struct kvm_vcpu *vcpu)
1514{
1515 struct kvm_run *run = vcpu->run;
1516
1517 /*
1518 * If MSA not present or not exposed to guest or FR=0, the MSA operation
1519 * should have been treated as a reserved instruction!
1520 * Same if CU1=1, FR=0.
1521 * If MSA already in use, we shouldn't get this at all.
1522 */
1523 if (!kvm_mips_guest_has_msa(&vcpu->arch) ||
1524 (read_gc0_status() & (ST0_CU1 | ST0_FR)) == ST0_CU1 ||
1525 !(read_gc0_config5() & MIPS_CONF5_MSAEN) ||
1526 vcpu->arch.aux_inuse & KVM_MIPS_AUX_MSA) {
1527 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1528 return RESUME_HOST;
1529 }
1530
1531 kvm_own_msa(vcpu);
1532
1533 return RESUME_GUEST;
1534}
1535
1536static int kvm_trap_vz_handle_tlb_ld_miss(struct kvm_vcpu *vcpu)
1537{
1538 struct kvm_run *run = vcpu->run;
1539 u32 *opc = (u32 *) vcpu->arch.pc;
1540 u32 cause = vcpu->arch.host_cp0_cause;
1541 ulong badvaddr = vcpu->arch.host_cp0_badvaddr;
1542 union mips_instruction inst;
1543 enum emulation_result er = EMULATE_DONE;
1544 int err, ret = RESUME_GUEST;
1545
1546 if (kvm_mips_handle_vz_root_tlb_fault(badvaddr, vcpu, false)) {
1547 /* A code fetch fault doesn't count as an MMIO */
1548 if (kvm_is_ifetch_fault(&vcpu->arch)) {
1549 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1550 return RESUME_HOST;
1551 }
1552
1553 /* Fetch the instruction */
1554 if (cause & CAUSEF_BD)
1555 opc += 1;
1556 err = kvm_get_badinstr(opc, vcpu, &inst.word);
1557 if (err) {
1558 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1559 return RESUME_HOST;
1560 }
1561
1562 /* Treat as MMIO */
1563 er = kvm_mips_emulate_load(inst, cause, run, vcpu);
1564 if (er == EMULATE_FAIL) {
1565 kvm_err("Guest Emulate Load from MMIO space failed: PC: %p, BadVaddr: %#lx\n",
1566 opc, badvaddr);
1567 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1568 }
1569 }
1570
1571 if (er == EMULATE_DONE) {
1572 ret = RESUME_GUEST;
1573 } else if (er == EMULATE_DO_MMIO) {
1574 run->exit_reason = KVM_EXIT_MMIO;
1575 ret = RESUME_HOST;
1576 } else {
1577 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1578 ret = RESUME_HOST;
1579 }
1580 return ret;
1581}
1582
1583static int kvm_trap_vz_handle_tlb_st_miss(struct kvm_vcpu *vcpu)
1584{
1585 struct kvm_run *run = vcpu->run;
1586 u32 *opc = (u32 *) vcpu->arch.pc;
1587 u32 cause = vcpu->arch.host_cp0_cause;
1588 ulong badvaddr = vcpu->arch.host_cp0_badvaddr;
1589 union mips_instruction inst;
1590 enum emulation_result er = EMULATE_DONE;
1591 int err;
1592 int ret = RESUME_GUEST;
1593
1594 /* Just try the access again if we couldn't do the translation */
1595 if (kvm_vz_badvaddr_to_gpa(vcpu, badvaddr, &badvaddr))
1596 return RESUME_GUEST;
1597 vcpu->arch.host_cp0_badvaddr = badvaddr;
1598
1599 if (kvm_mips_handle_vz_root_tlb_fault(badvaddr, vcpu, true)) {
1600 /* Fetch the instruction */
1601 if (cause & CAUSEF_BD)
1602 opc += 1;
1603 err = kvm_get_badinstr(opc, vcpu, &inst.word);
1604 if (err) {
1605 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1606 return RESUME_HOST;
1607 }
1608
1609 /* Treat as MMIO */
1610 er = kvm_mips_emulate_store(inst, cause, run, vcpu);
1611 if (er == EMULATE_FAIL) {
1612 kvm_err("Guest Emulate Store to MMIO space failed: PC: %p, BadVaddr: %#lx\n",
1613 opc, badvaddr);
1614 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1615 }
1616 }
1617
1618 if (er == EMULATE_DONE) {
1619 ret = RESUME_GUEST;
1620 } else if (er == EMULATE_DO_MMIO) {
1621 run->exit_reason = KVM_EXIT_MMIO;
1622 ret = RESUME_HOST;
1623 } else {
1624 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1625 ret = RESUME_HOST;
1626 }
1627 return ret;
1628}
1629
1630static u64 kvm_vz_get_one_regs[] = {
1631 KVM_REG_MIPS_CP0_INDEX,
1632 KVM_REG_MIPS_CP0_ENTRYLO0,
1633 KVM_REG_MIPS_CP0_ENTRYLO1,
1634 KVM_REG_MIPS_CP0_CONTEXT,
1635 KVM_REG_MIPS_CP0_PAGEMASK,
1636 KVM_REG_MIPS_CP0_PAGEGRAIN,
1637 KVM_REG_MIPS_CP0_WIRED,
1638 KVM_REG_MIPS_CP0_HWRENA,
1639 KVM_REG_MIPS_CP0_BADVADDR,
1640 KVM_REG_MIPS_CP0_COUNT,
1641 KVM_REG_MIPS_CP0_ENTRYHI,
1642 KVM_REG_MIPS_CP0_COMPARE,
1643 KVM_REG_MIPS_CP0_STATUS,
1644 KVM_REG_MIPS_CP0_INTCTL,
1645 KVM_REG_MIPS_CP0_CAUSE,
1646 KVM_REG_MIPS_CP0_EPC,
1647 KVM_REG_MIPS_CP0_PRID,
1648 KVM_REG_MIPS_CP0_EBASE,
1649 KVM_REG_MIPS_CP0_CONFIG,
1650 KVM_REG_MIPS_CP0_CONFIG1,
1651 KVM_REG_MIPS_CP0_CONFIG2,
1652 KVM_REG_MIPS_CP0_CONFIG3,
1653 KVM_REG_MIPS_CP0_CONFIG4,
1654 KVM_REG_MIPS_CP0_CONFIG5,
1655#ifdef CONFIG_64BIT
1656 KVM_REG_MIPS_CP0_XCONTEXT,
1657#endif
1658 KVM_REG_MIPS_CP0_ERROREPC,
1659
1660 KVM_REG_MIPS_COUNT_CTL,
1661 KVM_REG_MIPS_COUNT_RESUME,
1662 KVM_REG_MIPS_COUNT_HZ,
1663};
1664
1665static u64 kvm_vz_get_one_regs_contextconfig[] = {
1666 KVM_REG_MIPS_CP0_CONTEXTCONFIG,
1667#ifdef CONFIG_64BIT
1668 KVM_REG_MIPS_CP0_XCONTEXTCONFIG,
1669#endif
1670};
1671
1672static u64 kvm_vz_get_one_regs_segments[] = {
1673 KVM_REG_MIPS_CP0_SEGCTL0,
1674 KVM_REG_MIPS_CP0_SEGCTL1,
1675 KVM_REG_MIPS_CP0_SEGCTL2,
1676};
1677
1678static u64 kvm_vz_get_one_regs_htw[] = {
1679 KVM_REG_MIPS_CP0_PWBASE,
1680 KVM_REG_MIPS_CP0_PWFIELD,
1681 KVM_REG_MIPS_CP0_PWSIZE,
1682 KVM_REG_MIPS_CP0_PWCTL,
1683};
1684
1685static u64 kvm_vz_get_one_regs_kscratch[] = {
1686 KVM_REG_MIPS_CP0_KSCRATCH1,
1687 KVM_REG_MIPS_CP0_KSCRATCH2,
1688 KVM_REG_MIPS_CP0_KSCRATCH3,
1689 KVM_REG_MIPS_CP0_KSCRATCH4,
1690 KVM_REG_MIPS_CP0_KSCRATCH5,
1691 KVM_REG_MIPS_CP0_KSCRATCH6,
1692};
1693
1694static unsigned long kvm_vz_num_regs(struct kvm_vcpu *vcpu)
1695{
1696 unsigned long ret;
1697
1698 ret = ARRAY_SIZE(kvm_vz_get_one_regs);
1699 if (cpu_guest_has_userlocal)
1700 ++ret;
1701 if (cpu_guest_has_badinstr)
1702 ++ret;
1703 if (cpu_guest_has_badinstrp)
1704 ++ret;
1705 if (cpu_guest_has_contextconfig)
1706 ret += ARRAY_SIZE(kvm_vz_get_one_regs_contextconfig);
1707 if (cpu_guest_has_segments)
1708 ret += ARRAY_SIZE(kvm_vz_get_one_regs_segments);
1709 if (cpu_guest_has_htw)
1710 ret += ARRAY_SIZE(kvm_vz_get_one_regs_htw);
1711 if (cpu_guest_has_maar && !cpu_guest_has_dyn_maar)
1712 ret += 1 + ARRAY_SIZE(vcpu->arch.maar);
1713 ret += __arch_hweight8(cpu_data[0].guest.kscratch_mask);
1714
1715 return ret;
1716}
1717
1718static int kvm_vz_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices)
1719{
1720 u64 index;
1721 unsigned int i;
1722
1723 if (copy_to_user(indices, kvm_vz_get_one_regs,
1724 sizeof(kvm_vz_get_one_regs)))
1725 return -EFAULT;
1726 indices += ARRAY_SIZE(kvm_vz_get_one_regs);
1727
1728 if (cpu_guest_has_userlocal) {
1729 index = KVM_REG_MIPS_CP0_USERLOCAL;
1730 if (copy_to_user(indices, &index, sizeof(index)))
1731 return -EFAULT;
1732 ++indices;
1733 }
1734 if (cpu_guest_has_badinstr) {
1735 index = KVM_REG_MIPS_CP0_BADINSTR;
1736 if (copy_to_user(indices, &index, sizeof(index)))
1737 return -EFAULT;
1738 ++indices;
1739 }
1740 if (cpu_guest_has_badinstrp) {
1741 index = KVM_REG_MIPS_CP0_BADINSTRP;
1742 if (copy_to_user(indices, &index, sizeof(index)))
1743 return -EFAULT;
1744 ++indices;
1745 }
1746 if (cpu_guest_has_contextconfig) {
1747 if (copy_to_user(indices, kvm_vz_get_one_regs_contextconfig,
1748 sizeof(kvm_vz_get_one_regs_contextconfig)))
1749 return -EFAULT;
1750 indices += ARRAY_SIZE(kvm_vz_get_one_regs_contextconfig);
1751 }
1752 if (cpu_guest_has_segments) {
1753 if (copy_to_user(indices, kvm_vz_get_one_regs_segments,
1754 sizeof(kvm_vz_get_one_regs_segments)))
1755 return -EFAULT;
1756 indices += ARRAY_SIZE(kvm_vz_get_one_regs_segments);
1757 }
1758 if (cpu_guest_has_htw) {
1759 if (copy_to_user(indices, kvm_vz_get_one_regs_htw,
1760 sizeof(kvm_vz_get_one_regs_htw)))
1761 return -EFAULT;
1762 indices += ARRAY_SIZE(kvm_vz_get_one_regs_htw);
1763 }
1764 if (cpu_guest_has_maar && !cpu_guest_has_dyn_maar) {
1765 for (i = 0; i < ARRAY_SIZE(vcpu->arch.maar); ++i) {
1766 index = KVM_REG_MIPS_CP0_MAAR(i);
1767 if (copy_to_user(indices, &index, sizeof(index)))
1768 return -EFAULT;
1769 ++indices;
1770 }
1771
1772 index = KVM_REG_MIPS_CP0_MAARI;
1773 if (copy_to_user(indices, &index, sizeof(index)))
1774 return -EFAULT;
1775 ++indices;
1776 }
1777 for (i = 0; i < 6; ++i) {
1778 if (!cpu_guest_has_kscr(i + 2))
1779 continue;
1780
1781 if (copy_to_user(indices, &kvm_vz_get_one_regs_kscratch[i],
1782 sizeof(kvm_vz_get_one_regs_kscratch[i])))
1783 return -EFAULT;
1784 ++indices;
1785 }
1786
1787 return 0;
1788}
1789
1790static inline s64 entrylo_kvm_to_user(unsigned long v)
1791{
1792 s64 mask, ret = v;
1793
1794 if (BITS_PER_LONG == 32) {
1795 /*
1796 * KVM API exposes 64-bit version of the register, so move the
1797 * RI/XI bits up into place.
1798 */
1799 mask = MIPS_ENTRYLO_RI | MIPS_ENTRYLO_XI;
1800 ret &= ~mask;
1801 ret |= ((s64)v & mask) << 32;
1802 }
1803 return ret;
1804}
1805
1806static inline unsigned long entrylo_user_to_kvm(s64 v)
1807{
1808 unsigned long mask, ret = v;
1809
1810 if (BITS_PER_LONG == 32) {
1811 /*
1812 * KVM API exposes 64-bit versiono of the register, so move the
1813 * RI/XI bits down into place.
1814 */
1815 mask = MIPS_ENTRYLO_RI | MIPS_ENTRYLO_XI;
1816 ret &= ~mask;
1817 ret |= (v >> 32) & mask;
1818 }
1819 return ret;
1820}
1821
1822static int kvm_vz_get_one_reg(struct kvm_vcpu *vcpu,
1823 const struct kvm_one_reg *reg,
1824 s64 *v)
1825{
1826 struct mips_coproc *cop0 = vcpu->arch.cop0;
1827 unsigned int idx;
1828
1829 switch (reg->id) {
1830 case KVM_REG_MIPS_CP0_INDEX:
1831 *v = (long)read_gc0_index();
1832 break;
1833 case KVM_REG_MIPS_CP0_ENTRYLO0:
1834 *v = entrylo_kvm_to_user(read_gc0_entrylo0());
1835 break;
1836 case KVM_REG_MIPS_CP0_ENTRYLO1:
1837 *v = entrylo_kvm_to_user(read_gc0_entrylo1());
1838 break;
1839 case KVM_REG_MIPS_CP0_CONTEXT:
1840 *v = (long)read_gc0_context();
1841 break;
1842 case KVM_REG_MIPS_CP0_CONTEXTCONFIG:
1843 if (!cpu_guest_has_contextconfig)
1844 return -EINVAL;
1845 *v = read_gc0_contextconfig();
1846 break;
1847 case KVM_REG_MIPS_CP0_USERLOCAL:
1848 if (!cpu_guest_has_userlocal)
1849 return -EINVAL;
1850 *v = read_gc0_userlocal();
1851 break;
1852#ifdef CONFIG_64BIT
1853 case KVM_REG_MIPS_CP0_XCONTEXTCONFIG:
1854 if (!cpu_guest_has_contextconfig)
1855 return -EINVAL;
1856 *v = read_gc0_xcontextconfig();
1857 break;
1858#endif
1859 case KVM_REG_MIPS_CP0_PAGEMASK:
1860 *v = (long)read_gc0_pagemask();
1861 break;
1862 case KVM_REG_MIPS_CP0_PAGEGRAIN:
1863 *v = (long)read_gc0_pagegrain();
1864 break;
1865 case KVM_REG_MIPS_CP0_SEGCTL0:
1866 if (!cpu_guest_has_segments)
1867 return -EINVAL;
1868 *v = read_gc0_segctl0();
1869 break;
1870 case KVM_REG_MIPS_CP0_SEGCTL1:
1871 if (!cpu_guest_has_segments)
1872 return -EINVAL;
1873 *v = read_gc0_segctl1();
1874 break;
1875 case KVM_REG_MIPS_CP0_SEGCTL2:
1876 if (!cpu_guest_has_segments)
1877 return -EINVAL;
1878 *v = read_gc0_segctl2();
1879 break;
1880 case KVM_REG_MIPS_CP0_PWBASE:
1881 if (!cpu_guest_has_htw)
1882 return -EINVAL;
1883 *v = read_gc0_pwbase();
1884 break;
1885 case KVM_REG_MIPS_CP0_PWFIELD:
1886 if (!cpu_guest_has_htw)
1887 return -EINVAL;
1888 *v = read_gc0_pwfield();
1889 break;
1890 case KVM_REG_MIPS_CP0_PWSIZE:
1891 if (!cpu_guest_has_htw)
1892 return -EINVAL;
1893 *v = read_gc0_pwsize();
1894 break;
1895 case KVM_REG_MIPS_CP0_WIRED:
1896 *v = (long)read_gc0_wired();
1897 break;
1898 case KVM_REG_MIPS_CP0_PWCTL:
1899 if (!cpu_guest_has_htw)
1900 return -EINVAL;
1901 *v = read_gc0_pwctl();
1902 break;
1903 case KVM_REG_MIPS_CP0_HWRENA:
1904 *v = (long)read_gc0_hwrena();
1905 break;
1906 case KVM_REG_MIPS_CP0_BADVADDR:
1907 *v = (long)read_gc0_badvaddr();
1908 break;
1909 case KVM_REG_MIPS_CP0_BADINSTR:
1910 if (!cpu_guest_has_badinstr)
1911 return -EINVAL;
1912 *v = read_gc0_badinstr();
1913 break;
1914 case KVM_REG_MIPS_CP0_BADINSTRP:
1915 if (!cpu_guest_has_badinstrp)
1916 return -EINVAL;
1917 *v = read_gc0_badinstrp();
1918 break;
1919 case KVM_REG_MIPS_CP0_COUNT:
1920 *v = kvm_mips_read_count(vcpu);
1921 break;
1922 case KVM_REG_MIPS_CP0_ENTRYHI:
1923 *v = (long)read_gc0_entryhi();
1924 break;
1925 case KVM_REG_MIPS_CP0_COMPARE:
1926 *v = (long)read_gc0_compare();
1927 break;
1928 case KVM_REG_MIPS_CP0_STATUS:
1929 *v = (long)read_gc0_status();
1930 break;
1931 case KVM_REG_MIPS_CP0_INTCTL:
1932 *v = read_gc0_intctl();
1933 break;
1934 case KVM_REG_MIPS_CP0_CAUSE:
1935 *v = (long)read_gc0_cause();
1936 break;
1937 case KVM_REG_MIPS_CP0_EPC:
1938 *v = (long)read_gc0_epc();
1939 break;
1940 case KVM_REG_MIPS_CP0_PRID:
1941 switch (boot_cpu_type()) {
1942 case CPU_CAVIUM_OCTEON3:
1943 /* Octeon III has a read-only guest.PRid */
1944 *v = read_gc0_prid();
1945 break;
1946 default:
1947 *v = (long)kvm_read_c0_guest_prid(cop0);
1948 break;
1949 };
1950 break;
1951 case KVM_REG_MIPS_CP0_EBASE:
1952 *v = kvm_vz_read_gc0_ebase();
1953 break;
1954 case KVM_REG_MIPS_CP0_CONFIG:
1955 *v = read_gc0_config();
1956 break;
1957 case KVM_REG_MIPS_CP0_CONFIG1:
1958 if (!cpu_guest_has_conf1)
1959 return -EINVAL;
1960 *v = read_gc0_config1();
1961 break;
1962 case KVM_REG_MIPS_CP0_CONFIG2:
1963 if (!cpu_guest_has_conf2)
1964 return -EINVAL;
1965 *v = read_gc0_config2();
1966 break;
1967 case KVM_REG_MIPS_CP0_CONFIG3:
1968 if (!cpu_guest_has_conf3)
1969 return -EINVAL;
1970 *v = read_gc0_config3();
1971 break;
1972 case KVM_REG_MIPS_CP0_CONFIG4:
1973 if (!cpu_guest_has_conf4)
1974 return -EINVAL;
1975 *v = read_gc0_config4();
1976 break;
1977 case KVM_REG_MIPS_CP0_CONFIG5:
1978 if (!cpu_guest_has_conf5)
1979 return -EINVAL;
1980 *v = read_gc0_config5();
1981 break;
1982 case KVM_REG_MIPS_CP0_MAAR(0) ... KVM_REG_MIPS_CP0_MAAR(0x3f):
1983 if (!cpu_guest_has_maar || cpu_guest_has_dyn_maar)
1984 return -EINVAL;
1985 idx = reg->id - KVM_REG_MIPS_CP0_MAAR(0);
1986 if (idx >= ARRAY_SIZE(vcpu->arch.maar))
1987 return -EINVAL;
1988 *v = vcpu->arch.maar[idx];
1989 break;
1990 case KVM_REG_MIPS_CP0_MAARI:
1991 if (!cpu_guest_has_maar || cpu_guest_has_dyn_maar)
1992 return -EINVAL;
1993 *v = kvm_read_sw_gc0_maari(vcpu->arch.cop0);
1994 break;
1995#ifdef CONFIG_64BIT
1996 case KVM_REG_MIPS_CP0_XCONTEXT:
1997 *v = read_gc0_xcontext();
1998 break;
1999#endif
2000 case KVM_REG_MIPS_CP0_ERROREPC:
2001 *v = (long)read_gc0_errorepc();
2002 break;
2003 case KVM_REG_MIPS_CP0_KSCRATCH1 ... KVM_REG_MIPS_CP0_KSCRATCH6:
2004 idx = reg->id - KVM_REG_MIPS_CP0_KSCRATCH1 + 2;
2005 if (!cpu_guest_has_kscr(idx))
2006 return -EINVAL;
2007 switch (idx) {
2008 case 2:
2009 *v = (long)read_gc0_kscratch1();
2010 break;
2011 case 3:
2012 *v = (long)read_gc0_kscratch2();
2013 break;
2014 case 4:
2015 *v = (long)read_gc0_kscratch3();
2016 break;
2017 case 5:
2018 *v = (long)read_gc0_kscratch4();
2019 break;
2020 case 6:
2021 *v = (long)read_gc0_kscratch5();
2022 break;
2023 case 7:
2024 *v = (long)read_gc0_kscratch6();
2025 break;
2026 }
2027 break;
2028 case KVM_REG_MIPS_COUNT_CTL:
2029 *v = vcpu->arch.count_ctl;
2030 break;
2031 case KVM_REG_MIPS_COUNT_RESUME:
2032 *v = ktime_to_ns(vcpu->arch.count_resume);
2033 break;
2034 case KVM_REG_MIPS_COUNT_HZ:
2035 *v = vcpu->arch.count_hz;
2036 break;
2037 default:
2038 return -EINVAL;
2039 }
2040 return 0;
2041}
2042
2043static int kvm_vz_set_one_reg(struct kvm_vcpu *vcpu,
2044 const struct kvm_one_reg *reg,
2045 s64 v)
2046{
2047 struct mips_coproc *cop0 = vcpu->arch.cop0;
2048 unsigned int idx;
2049 int ret = 0;
2050 unsigned int cur, change;
2051
2052 switch (reg->id) {
2053 case KVM_REG_MIPS_CP0_INDEX:
2054 write_gc0_index(v);
2055 break;
2056 case KVM_REG_MIPS_CP0_ENTRYLO0:
2057 write_gc0_entrylo0(entrylo_user_to_kvm(v));
2058 break;
2059 case KVM_REG_MIPS_CP0_ENTRYLO1:
2060 write_gc0_entrylo1(entrylo_user_to_kvm(v));
2061 break;
2062 case KVM_REG_MIPS_CP0_CONTEXT:
2063 write_gc0_context(v);
2064 break;
2065 case KVM_REG_MIPS_CP0_CONTEXTCONFIG:
2066 if (!cpu_guest_has_contextconfig)
2067 return -EINVAL;
2068 write_gc0_contextconfig(v);
2069 break;
2070 case KVM_REG_MIPS_CP0_USERLOCAL:
2071 if (!cpu_guest_has_userlocal)
2072 return -EINVAL;
2073 write_gc0_userlocal(v);
2074 break;
2075#ifdef CONFIG_64BIT
2076 case KVM_REG_MIPS_CP0_XCONTEXTCONFIG:
2077 if (!cpu_guest_has_contextconfig)
2078 return -EINVAL;
2079 write_gc0_xcontextconfig(v);
2080 break;
2081#endif
2082 case KVM_REG_MIPS_CP0_PAGEMASK:
2083 write_gc0_pagemask(v);
2084 break;
2085 case KVM_REG_MIPS_CP0_PAGEGRAIN:
2086 write_gc0_pagegrain(v);
2087 break;
2088 case KVM_REG_MIPS_CP0_SEGCTL0:
2089 if (!cpu_guest_has_segments)
2090 return -EINVAL;
2091 write_gc0_segctl0(v);
2092 break;
2093 case KVM_REG_MIPS_CP0_SEGCTL1:
2094 if (!cpu_guest_has_segments)
2095 return -EINVAL;
2096 write_gc0_segctl1(v);
2097 break;
2098 case KVM_REG_MIPS_CP0_SEGCTL2:
2099 if (!cpu_guest_has_segments)
2100 return -EINVAL;
2101 write_gc0_segctl2(v);
2102 break;
2103 case KVM_REG_MIPS_CP0_PWBASE:
2104 if (!cpu_guest_has_htw)
2105 return -EINVAL;
2106 write_gc0_pwbase(v);
2107 break;
2108 case KVM_REG_MIPS_CP0_PWFIELD:
2109 if (!cpu_guest_has_htw)
2110 return -EINVAL;
2111 write_gc0_pwfield(v);
2112 break;
2113 case KVM_REG_MIPS_CP0_PWSIZE:
2114 if (!cpu_guest_has_htw)
2115 return -EINVAL;
2116 write_gc0_pwsize(v);
2117 break;
2118 case KVM_REG_MIPS_CP0_WIRED:
2119 change_gc0_wired(MIPSR6_WIRED_WIRED, v);
2120 break;
2121 case KVM_REG_MIPS_CP0_PWCTL:
2122 if (!cpu_guest_has_htw)
2123 return -EINVAL;
2124 write_gc0_pwctl(v);
2125 break;
2126 case KVM_REG_MIPS_CP0_HWRENA:
2127 write_gc0_hwrena(v);
2128 break;
2129 case KVM_REG_MIPS_CP0_BADVADDR:
2130 write_gc0_badvaddr(v);
2131 break;
2132 case KVM_REG_MIPS_CP0_BADINSTR:
2133 if (!cpu_guest_has_badinstr)
2134 return -EINVAL;
2135 write_gc0_badinstr(v);
2136 break;
2137 case KVM_REG_MIPS_CP0_BADINSTRP:
2138 if (!cpu_guest_has_badinstrp)
2139 return -EINVAL;
2140 write_gc0_badinstrp(v);
2141 break;
2142 case KVM_REG_MIPS_CP0_COUNT:
2143 kvm_mips_write_count(vcpu, v);
2144 break;
2145 case KVM_REG_MIPS_CP0_ENTRYHI:
2146 write_gc0_entryhi(v);
2147 break;
2148 case KVM_REG_MIPS_CP0_COMPARE:
2149 kvm_mips_write_compare(vcpu, v, false);
2150 break;
2151 case KVM_REG_MIPS_CP0_STATUS:
2152 write_gc0_status(v);
2153 break;
2154 case KVM_REG_MIPS_CP0_INTCTL:
2155 write_gc0_intctl(v);
2156 break;
2157 case KVM_REG_MIPS_CP0_CAUSE:
2158 /*
2159 * If the timer is stopped or started (DC bit) it must look
2160 * atomic with changes to the timer interrupt pending bit (TI).
2161 * A timer interrupt should not happen in between.
2162 */
2163 if ((read_gc0_cause() ^ v) & CAUSEF_DC) {
2164 if (v & CAUSEF_DC) {
2165 /* disable timer first */
2166 kvm_mips_count_disable_cause(vcpu);
2167 change_gc0_cause((u32)~CAUSEF_DC, v);
2168 } else {
2169 /* enable timer last */
2170 change_gc0_cause((u32)~CAUSEF_DC, v);
2171 kvm_mips_count_enable_cause(vcpu);
2172 }
2173 } else {
2174 write_gc0_cause(v);
2175 }
2176 break;
2177 case KVM_REG_MIPS_CP0_EPC:
2178 write_gc0_epc(v);
2179 break;
2180 case KVM_REG_MIPS_CP0_PRID:
2181 switch (boot_cpu_type()) {
2182 case CPU_CAVIUM_OCTEON3:
2183 /* Octeon III has a guest.PRid, but its read-only */
2184 break;
2185 default:
2186 kvm_write_c0_guest_prid(cop0, v);
2187 break;
2188 };
2189 break;
2190 case KVM_REG_MIPS_CP0_EBASE:
2191 kvm_vz_write_gc0_ebase(v);
2192 break;
2193 case KVM_REG_MIPS_CP0_CONFIG:
2194 cur = read_gc0_config();
2195 change = (cur ^ v) & kvm_vz_config_user_wrmask(vcpu);
2196 if (change) {
2197 v = cur ^ change;
2198 write_gc0_config(v);
2199 }
2200 break;
2201 case KVM_REG_MIPS_CP0_CONFIG1:
2202 if (!cpu_guest_has_conf1)
2203 break;
2204 cur = read_gc0_config1();
2205 change = (cur ^ v) & kvm_vz_config1_user_wrmask(vcpu);
2206 if (change) {
2207 v = cur ^ change;
2208 write_gc0_config1(v);
2209 }
2210 break;
2211 case KVM_REG_MIPS_CP0_CONFIG2:
2212 if (!cpu_guest_has_conf2)
2213 break;
2214 cur = read_gc0_config2();
2215 change = (cur ^ v) & kvm_vz_config2_user_wrmask(vcpu);
2216 if (change) {
2217 v = cur ^ change;
2218 write_gc0_config2(v);
2219 }
2220 break;
2221 case KVM_REG_MIPS_CP0_CONFIG3:
2222 if (!cpu_guest_has_conf3)
2223 break;
2224 cur = read_gc0_config3();
2225 change = (cur ^ v) & kvm_vz_config3_user_wrmask(vcpu);
2226 if (change) {
2227 v = cur ^ change;
2228 write_gc0_config3(v);
2229 }
2230 break;
2231 case KVM_REG_MIPS_CP0_CONFIG4:
2232 if (!cpu_guest_has_conf4)
2233 break;
2234 cur = read_gc0_config4();
2235 change = (cur ^ v) & kvm_vz_config4_user_wrmask(vcpu);
2236 if (change) {
2237 v = cur ^ change;
2238 write_gc0_config4(v);
2239 }
2240 break;
2241 case KVM_REG_MIPS_CP0_CONFIG5:
2242 if (!cpu_guest_has_conf5)
2243 break;
2244 cur = read_gc0_config5();
2245 change = (cur ^ v) & kvm_vz_config5_user_wrmask(vcpu);
2246 if (change) {
2247 v = cur ^ change;
2248 write_gc0_config5(v);
2249 }
2250 break;
2251 case KVM_REG_MIPS_CP0_MAAR(0) ... KVM_REG_MIPS_CP0_MAAR(0x3f):
2252 if (!cpu_guest_has_maar || cpu_guest_has_dyn_maar)
2253 return -EINVAL;
2254 idx = reg->id - KVM_REG_MIPS_CP0_MAAR(0);
2255 if (idx >= ARRAY_SIZE(vcpu->arch.maar))
2256 return -EINVAL;
2257 vcpu->arch.maar[idx] = mips_process_maar(dmtc_op, v);
2258 break;
2259 case KVM_REG_MIPS_CP0_MAARI:
2260 if (!cpu_guest_has_maar || cpu_guest_has_dyn_maar)
2261 return -EINVAL;
2262 kvm_write_maari(vcpu, v);
2263 break;
2264#ifdef CONFIG_64BIT
2265 case KVM_REG_MIPS_CP0_XCONTEXT:
2266 write_gc0_xcontext(v);
2267 break;
2268#endif
2269 case KVM_REG_MIPS_CP0_ERROREPC:
2270 write_gc0_errorepc(v);
2271 break;
2272 case KVM_REG_MIPS_CP0_KSCRATCH1 ... KVM_REG_MIPS_CP0_KSCRATCH6:
2273 idx = reg->id - KVM_REG_MIPS_CP0_KSCRATCH1 + 2;
2274 if (!cpu_guest_has_kscr(idx))
2275 return -EINVAL;
2276 switch (idx) {
2277 case 2:
2278 write_gc0_kscratch1(v);
2279 break;
2280 case 3:
2281 write_gc0_kscratch2(v);
2282 break;
2283 case 4:
2284 write_gc0_kscratch3(v);
2285 break;
2286 case 5:
2287 write_gc0_kscratch4(v);
2288 break;
2289 case 6:
2290 write_gc0_kscratch5(v);
2291 break;
2292 case 7:
2293 write_gc0_kscratch6(v);
2294 break;
2295 }
2296 break;
2297 case KVM_REG_MIPS_COUNT_CTL:
2298 ret = kvm_mips_set_count_ctl(vcpu, v);
2299 break;
2300 case KVM_REG_MIPS_COUNT_RESUME:
2301 ret = kvm_mips_set_count_resume(vcpu, v);
2302 break;
2303 case KVM_REG_MIPS_COUNT_HZ:
2304 ret = kvm_mips_set_count_hz(vcpu, v);
2305 break;
2306 default:
2307 return -EINVAL;
2308 }
2309 return ret;
2310}
2311
2312#define guestid_cache(cpu) (cpu_data[cpu].guestid_cache)
2313static void kvm_vz_get_new_guestid(unsigned long cpu, struct kvm_vcpu *vcpu)
2314{
2315 unsigned long guestid = guestid_cache(cpu);
2316
2317 if (!(++guestid & GUESTID_MASK)) {
2318 if (cpu_has_vtag_icache)
2319 flush_icache_all();
2320
2321 if (!guestid) /* fix version if needed */
2322 guestid = GUESTID_FIRST_VERSION;
2323
2324 ++guestid; /* guestid 0 reserved for root */
2325
2326 /* start new guestid cycle */
2327 kvm_vz_local_flush_roottlb_all_guests();
2328 kvm_vz_local_flush_guesttlb_all();
2329 }
2330
2331 guestid_cache(cpu) = guestid;
2332}
2333
2334/* Returns 1 if the guest TLB may be clobbered */
2335static int kvm_vz_check_requests(struct kvm_vcpu *vcpu, int cpu)
2336{
2337 int ret = 0;
2338 int i;
2339
2340 if (!kvm_request_pending(vcpu))
2341 return 0;
2342
2343 if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) {
2344 if (cpu_has_guestid) {
2345 /* Drop all GuestIDs for this VCPU */
2346 for_each_possible_cpu(i)
2347 vcpu->arch.vzguestid[i] = 0;
2348 /* This will clobber guest TLB contents too */
2349 ret = 1;
2350 }
2351 /*
2352 * For Root ASID Dealias (RAD) we don't do anything here, but we
2353 * still need the request to ensure we recheck asid_flush_mask.
2354 * We can still return 0 as only the root TLB will be affected
2355 * by a root ASID flush.
2356 */
2357 }
2358
2359 return ret;
2360}
2361
2362static void kvm_vz_vcpu_save_wired(struct kvm_vcpu *vcpu)
2363{
2364 unsigned int wired = read_gc0_wired();
2365 struct kvm_mips_tlb *tlbs;
2366 int i;
2367
2368 /* Expand the wired TLB array if necessary */
2369 wired &= MIPSR6_WIRED_WIRED;
2370 if (wired > vcpu->arch.wired_tlb_limit) {
2371 tlbs = krealloc(vcpu->arch.wired_tlb, wired *
2372 sizeof(*vcpu->arch.wired_tlb), GFP_ATOMIC);
2373 if (WARN_ON(!tlbs)) {
2374 /* Save whatever we can */
2375 wired = vcpu->arch.wired_tlb_limit;
2376 } else {
2377 vcpu->arch.wired_tlb = tlbs;
2378 vcpu->arch.wired_tlb_limit = wired;
2379 }
2380 }
2381
2382 if (wired)
2383 /* Save wired entries from the guest TLB */
2384 kvm_vz_save_guesttlb(vcpu->arch.wired_tlb, 0, wired);
2385 /* Invalidate any dropped entries since last time */
2386 for (i = wired; i < vcpu->arch.wired_tlb_used; ++i) {
2387 vcpu->arch.wired_tlb[i].tlb_hi = UNIQUE_GUEST_ENTRYHI(i);
2388 vcpu->arch.wired_tlb[i].tlb_lo[0] = 0;
2389 vcpu->arch.wired_tlb[i].tlb_lo[1] = 0;
2390 vcpu->arch.wired_tlb[i].tlb_mask = 0;
2391 }
2392 vcpu->arch.wired_tlb_used = wired;
2393}
2394
2395static void kvm_vz_vcpu_load_wired(struct kvm_vcpu *vcpu)
2396{
2397 /* Load wired entries into the guest TLB */
2398 if (vcpu->arch.wired_tlb)
2399 kvm_vz_load_guesttlb(vcpu->arch.wired_tlb, 0,
2400 vcpu->arch.wired_tlb_used);
2401}
2402
2403static void kvm_vz_vcpu_load_tlb(struct kvm_vcpu *vcpu, int cpu)
2404{
2405 struct kvm *kvm = vcpu->kvm;
2406 struct mm_struct *gpa_mm = &kvm->arch.gpa_mm;
2407 bool migrated;
2408
2409 /*
2410 * Are we entering guest context on a different CPU to last time?
2411 * If so, the VCPU's guest TLB state on this CPU may be stale.
2412 */
2413 migrated = (vcpu->arch.last_exec_cpu != cpu);
2414 vcpu->arch.last_exec_cpu = cpu;
2415
2416 /*
2417 * A vcpu's GuestID is set in GuestCtl1.ID when the vcpu is loaded and
2418 * remains set until another vcpu is loaded in. As a rule GuestRID
2419 * remains zeroed when in root context unless the kernel is busy
2420 * manipulating guest tlb entries.
2421 */
2422 if (cpu_has_guestid) {
2423 /*
2424 * Check if our GuestID is of an older version and thus invalid.
2425 *
2426 * We also discard the stored GuestID if we've executed on
2427 * another CPU, as the guest mappings may have changed without
2428 * hypervisor knowledge.
2429 */
2430 if (migrated ||
2431 (vcpu->arch.vzguestid[cpu] ^ guestid_cache(cpu)) &
2432 GUESTID_VERSION_MASK) {
2433 kvm_vz_get_new_guestid(cpu, vcpu);
2434 vcpu->arch.vzguestid[cpu] = guestid_cache(cpu);
2435 trace_kvm_guestid_change(vcpu,
2436 vcpu->arch.vzguestid[cpu]);
2437 }
2438
2439 /* Restore GuestID */
2440 change_c0_guestctl1(GUESTID_MASK, vcpu->arch.vzguestid[cpu]);
2441 } else {
2442 /*
2443 * The Guest TLB only stores a single guest's TLB state, so
2444 * flush it if another VCPU has executed on this CPU.
2445 *
2446 * We also flush if we've executed on another CPU, as the guest
2447 * mappings may have changed without hypervisor knowledge.
2448 */
2449 if (migrated || last_exec_vcpu[cpu] != vcpu)
2450 kvm_vz_local_flush_guesttlb_all();
2451 last_exec_vcpu[cpu] = vcpu;
2452
2453 /*
2454 * Root ASID dealiases guest GPA mappings in the root TLB.
2455 * Allocate new root ASID if needed.
2456 */
2457 if (cpumask_test_and_clear_cpu(cpu, &kvm->arch.asid_flush_mask)
2458 || (cpu_context(cpu, gpa_mm) ^ asid_cache(cpu)) &
2459 asid_version_mask(cpu))
2460 get_new_mmu_context(gpa_mm, cpu);
2461 }
2462}
2463
2464static int kvm_vz_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
2465{
2466 struct mips_coproc *cop0 = vcpu->arch.cop0;
2467 bool migrated, all;
2468
2469 /*
2470 * Have we migrated to a different CPU?
2471 * If so, any old guest TLB state may be stale.
2472 */
2473 migrated = (vcpu->arch.last_sched_cpu != cpu);
2474
2475 /*
2476 * Was this the last VCPU to run on this CPU?
2477 * If not, any old guest state from this VCPU will have been clobbered.
2478 */
2479 all = migrated || (last_vcpu[cpu] != vcpu);
2480 last_vcpu[cpu] = vcpu;
2481
2482 /*
2483 * Restore CP0_Wired unconditionally as we clear it after use, and
2484 * restore wired guest TLB entries (while in guest context).
2485 */
2486 kvm_restore_gc0_wired(cop0);
2487 if (current->flags & PF_VCPU) {
2488 tlbw_use_hazard();
2489 kvm_vz_vcpu_load_tlb(vcpu, cpu);
2490 kvm_vz_vcpu_load_wired(vcpu);
2491 }
2492
2493 /*
2494 * Restore timer state regardless, as e.g. Cause.TI can change over time
2495 * if left unmaintained.
2496 */
2497 kvm_vz_restore_timer(vcpu);
2498
2499 /* Set MC bit if we want to trace guest mode changes */
2500 if (kvm_trace_guest_mode_change)
2501 set_c0_guestctl0(MIPS_GCTL0_MC);
2502 else
2503 clear_c0_guestctl0(MIPS_GCTL0_MC);
2504
2505 /* Don't bother restoring registers multiple times unless necessary */
2506 if (!all)
2507 return 0;
2508
2509 /*
2510 * Restore config registers first, as some implementations restrict
2511 * writes to other registers when the corresponding feature bits aren't
2512 * set. For example Status.CU1 cannot be set unless Config1.FP is set.
2513 */
2514 kvm_restore_gc0_config(cop0);
2515 if (cpu_guest_has_conf1)
2516 kvm_restore_gc0_config1(cop0);
2517 if (cpu_guest_has_conf2)
2518 kvm_restore_gc0_config2(cop0);
2519 if (cpu_guest_has_conf3)
2520 kvm_restore_gc0_config3(cop0);
2521 if (cpu_guest_has_conf4)
2522 kvm_restore_gc0_config4(cop0);
2523 if (cpu_guest_has_conf5)
2524 kvm_restore_gc0_config5(cop0);
2525 if (cpu_guest_has_conf6)
2526 kvm_restore_gc0_config6(cop0);
2527 if (cpu_guest_has_conf7)
2528 kvm_restore_gc0_config7(cop0);
2529
2530 kvm_restore_gc0_index(cop0);
2531 kvm_restore_gc0_entrylo0(cop0);
2532 kvm_restore_gc0_entrylo1(cop0);
2533 kvm_restore_gc0_context(cop0);
2534 if (cpu_guest_has_contextconfig)
2535 kvm_restore_gc0_contextconfig(cop0);
2536#ifdef CONFIG_64BIT
2537 kvm_restore_gc0_xcontext(cop0);
2538 if (cpu_guest_has_contextconfig)
2539 kvm_restore_gc0_xcontextconfig(cop0);
2540#endif
2541 kvm_restore_gc0_pagemask(cop0);
2542 kvm_restore_gc0_pagegrain(cop0);
2543 kvm_restore_gc0_hwrena(cop0);
2544 kvm_restore_gc0_badvaddr(cop0);
2545 kvm_restore_gc0_entryhi(cop0);
2546 kvm_restore_gc0_status(cop0);
2547 kvm_restore_gc0_intctl(cop0);
2548 kvm_restore_gc0_epc(cop0);
2549 kvm_vz_write_gc0_ebase(kvm_read_sw_gc0_ebase(cop0));
2550 if (cpu_guest_has_userlocal)
2551 kvm_restore_gc0_userlocal(cop0);
2552
2553 kvm_restore_gc0_errorepc(cop0);
2554
2555 /* restore KScratch registers if enabled in guest */
2556 if (cpu_guest_has_conf4) {
2557 if (cpu_guest_has_kscr(2))
2558 kvm_restore_gc0_kscratch1(cop0);
2559 if (cpu_guest_has_kscr(3))
2560 kvm_restore_gc0_kscratch2(cop0);
2561 if (cpu_guest_has_kscr(4))
2562 kvm_restore_gc0_kscratch3(cop0);
2563 if (cpu_guest_has_kscr(5))
2564 kvm_restore_gc0_kscratch4(cop0);
2565 if (cpu_guest_has_kscr(6))
2566 kvm_restore_gc0_kscratch5(cop0);
2567 if (cpu_guest_has_kscr(7))
2568 kvm_restore_gc0_kscratch6(cop0);
2569 }
2570
2571 if (cpu_guest_has_badinstr)
2572 kvm_restore_gc0_badinstr(cop0);
2573 if (cpu_guest_has_badinstrp)
2574 kvm_restore_gc0_badinstrp(cop0);
2575
2576 if (cpu_guest_has_segments) {
2577 kvm_restore_gc0_segctl0(cop0);
2578 kvm_restore_gc0_segctl1(cop0);
2579 kvm_restore_gc0_segctl2(cop0);
2580 }
2581
2582 /* restore HTW registers */
2583 if (cpu_guest_has_htw) {
2584 kvm_restore_gc0_pwbase(cop0);
2585 kvm_restore_gc0_pwfield(cop0);
2586 kvm_restore_gc0_pwsize(cop0);
2587 kvm_restore_gc0_pwctl(cop0);
2588 }
2589
2590 /* restore Root.GuestCtl2 from unused Guest guestctl2 register */
2591 if (cpu_has_guestctl2)
2592 write_c0_guestctl2(
2593 cop0->reg[MIPS_CP0_GUESTCTL2][MIPS_CP0_GUESTCTL2_SEL]);
2594
2595 /*
2596 * We should clear linked load bit to break interrupted atomics. This
2597 * prevents a SC on the next VCPU from succeeding by matching a LL on
2598 * the previous VCPU.
2599 */
2600 if (cpu_guest_has_rw_llb)
2601 write_gc0_lladdr(0);
2602
2603 return 0;
2604}
2605
2606static int kvm_vz_vcpu_put(struct kvm_vcpu *vcpu, int cpu)
2607{
2608 struct mips_coproc *cop0 = vcpu->arch.cop0;
2609
2610 if (current->flags & PF_VCPU)
2611 kvm_vz_vcpu_save_wired(vcpu);
2612
2613 kvm_lose_fpu(vcpu);
2614
2615 kvm_save_gc0_index(cop0);
2616 kvm_save_gc0_entrylo0(cop0);
2617 kvm_save_gc0_entrylo1(cop0);
2618 kvm_save_gc0_context(cop0);
2619 if (cpu_guest_has_contextconfig)
2620 kvm_save_gc0_contextconfig(cop0);
2621#ifdef CONFIG_64BIT
2622 kvm_save_gc0_xcontext(cop0);
2623 if (cpu_guest_has_contextconfig)
2624 kvm_save_gc0_xcontextconfig(cop0);
2625#endif
2626 kvm_save_gc0_pagemask(cop0);
2627 kvm_save_gc0_pagegrain(cop0);
2628 kvm_save_gc0_wired(cop0);
2629 /* allow wired TLB entries to be overwritten */
2630 clear_gc0_wired(MIPSR6_WIRED_WIRED);
2631 kvm_save_gc0_hwrena(cop0);
2632 kvm_save_gc0_badvaddr(cop0);
2633 kvm_save_gc0_entryhi(cop0);
2634 kvm_save_gc0_status(cop0);
2635 kvm_save_gc0_intctl(cop0);
2636 kvm_save_gc0_epc(cop0);
2637 kvm_write_sw_gc0_ebase(cop0, kvm_vz_read_gc0_ebase());
2638 if (cpu_guest_has_userlocal)
2639 kvm_save_gc0_userlocal(cop0);
2640
2641 /* only save implemented config registers */
2642 kvm_save_gc0_config(cop0);
2643 if (cpu_guest_has_conf1)
2644 kvm_save_gc0_config1(cop0);
2645 if (cpu_guest_has_conf2)
2646 kvm_save_gc0_config2(cop0);
2647 if (cpu_guest_has_conf3)
2648 kvm_save_gc0_config3(cop0);
2649 if (cpu_guest_has_conf4)
2650 kvm_save_gc0_config4(cop0);
2651 if (cpu_guest_has_conf5)
2652 kvm_save_gc0_config5(cop0);
2653 if (cpu_guest_has_conf6)
2654 kvm_save_gc0_config6(cop0);
2655 if (cpu_guest_has_conf7)
2656 kvm_save_gc0_config7(cop0);
2657
2658 kvm_save_gc0_errorepc(cop0);
2659
2660 /* save KScratch registers if enabled in guest */
2661 if (cpu_guest_has_conf4) {
2662 if (cpu_guest_has_kscr(2))
2663 kvm_save_gc0_kscratch1(cop0);
2664 if (cpu_guest_has_kscr(3))
2665 kvm_save_gc0_kscratch2(cop0);
2666 if (cpu_guest_has_kscr(4))
2667 kvm_save_gc0_kscratch3(cop0);
2668 if (cpu_guest_has_kscr(5))
2669 kvm_save_gc0_kscratch4(cop0);
2670 if (cpu_guest_has_kscr(6))
2671 kvm_save_gc0_kscratch5(cop0);
2672 if (cpu_guest_has_kscr(7))
2673 kvm_save_gc0_kscratch6(cop0);
2674 }
2675
2676 if (cpu_guest_has_badinstr)
2677 kvm_save_gc0_badinstr(cop0);
2678 if (cpu_guest_has_badinstrp)
2679 kvm_save_gc0_badinstrp(cop0);
2680
2681 if (cpu_guest_has_segments) {
2682 kvm_save_gc0_segctl0(cop0);
2683 kvm_save_gc0_segctl1(cop0);
2684 kvm_save_gc0_segctl2(cop0);
2685 }
2686
2687 /* save HTW registers if enabled in guest */
2688 if (cpu_guest_has_htw &&
2689 kvm_read_sw_gc0_config3(cop0) & MIPS_CONF3_PW) {
2690 kvm_save_gc0_pwbase(cop0);
2691 kvm_save_gc0_pwfield(cop0);
2692 kvm_save_gc0_pwsize(cop0);
2693 kvm_save_gc0_pwctl(cop0);
2694 }
2695
2696 kvm_vz_save_timer(vcpu);
2697
2698 /* save Root.GuestCtl2 in unused Guest guestctl2 register */
2699 if (cpu_has_guestctl2)
2700 cop0->reg[MIPS_CP0_GUESTCTL2][MIPS_CP0_GUESTCTL2_SEL] =
2701 read_c0_guestctl2();
2702
2703 return 0;
2704}
2705
2706/**
2707 * kvm_vz_resize_guest_vtlb() - Attempt to resize guest VTLB.
2708 * @size: Number of guest VTLB entries (0 < @size <= root VTLB entries).
2709 *
2710 * Attempt to resize the guest VTLB by writing guest Config registers. This is
2711 * necessary for cores with a shared root/guest TLB to avoid overlap with wired
2712 * entries in the root VTLB.
2713 *
2714 * Returns: The resulting guest VTLB size.
2715 */
2716static unsigned int kvm_vz_resize_guest_vtlb(unsigned int size)
2717{
2718 unsigned int config4 = 0, ret = 0, limit;
2719
2720 /* Write MMUSize - 1 into guest Config registers */
2721 if (cpu_guest_has_conf1)
2722 change_gc0_config1(MIPS_CONF1_TLBS,
2723 (size - 1) << MIPS_CONF1_TLBS_SHIFT);
2724 if (cpu_guest_has_conf4) {
2725 config4 = read_gc0_config4();
2726 if (cpu_has_mips_r6 || (config4 & MIPS_CONF4_MMUEXTDEF) ==
2727 MIPS_CONF4_MMUEXTDEF_VTLBSIZEEXT) {
2728 config4 &= ~MIPS_CONF4_VTLBSIZEEXT;
2729 config4 |= ((size - 1) >> MIPS_CONF1_TLBS_SIZE) <<
2730 MIPS_CONF4_VTLBSIZEEXT_SHIFT;
2731 } else if ((config4 & MIPS_CONF4_MMUEXTDEF) ==
2732 MIPS_CONF4_MMUEXTDEF_MMUSIZEEXT) {
2733 config4 &= ~MIPS_CONF4_MMUSIZEEXT;
2734 config4 |= ((size - 1) >> MIPS_CONF1_TLBS_SIZE) <<
2735 MIPS_CONF4_MMUSIZEEXT_SHIFT;
2736 }
2737 write_gc0_config4(config4);
2738 }
2739
2740 /*
2741 * Set Guest.Wired.Limit = 0 (no limit up to Guest.MMUSize-1), unless it
2742 * would exceed Root.Wired.Limit (clearing Guest.Wired.Wired so write
2743 * not dropped)
2744 */
2745 if (cpu_has_mips_r6) {
2746 limit = (read_c0_wired() & MIPSR6_WIRED_LIMIT) >>
2747 MIPSR6_WIRED_LIMIT_SHIFT;
2748 if (size - 1 <= limit)
2749 limit = 0;
2750 write_gc0_wired(limit << MIPSR6_WIRED_LIMIT_SHIFT);
2751 }
2752
2753 /* Read back MMUSize - 1 */
2754 back_to_back_c0_hazard();
2755 if (cpu_guest_has_conf1)
2756 ret = (read_gc0_config1() & MIPS_CONF1_TLBS) >>
2757 MIPS_CONF1_TLBS_SHIFT;
2758 if (config4) {
2759 if (cpu_has_mips_r6 || (config4 & MIPS_CONF4_MMUEXTDEF) ==
2760 MIPS_CONF4_MMUEXTDEF_VTLBSIZEEXT)
2761 ret |= ((config4 & MIPS_CONF4_VTLBSIZEEXT) >>
2762 MIPS_CONF4_VTLBSIZEEXT_SHIFT) <<
2763 MIPS_CONF1_TLBS_SIZE;
2764 else if ((config4 & MIPS_CONF4_MMUEXTDEF) ==
2765 MIPS_CONF4_MMUEXTDEF_MMUSIZEEXT)
2766 ret |= ((config4 & MIPS_CONF4_MMUSIZEEXT) >>
2767 MIPS_CONF4_MMUSIZEEXT_SHIFT) <<
2768 MIPS_CONF1_TLBS_SIZE;
2769 }
2770 return ret + 1;
2771}
2772
2773static int kvm_vz_hardware_enable(void)
2774{
2775 unsigned int mmu_size, guest_mmu_size, ftlb_size;
2776 u64 guest_cvmctl, cvmvmconfig;
2777
2778 switch (current_cpu_type()) {
2779 case CPU_CAVIUM_OCTEON3:
2780 /* Set up guest timer/perfcount IRQ lines */
2781 guest_cvmctl = read_gc0_cvmctl();
2782 guest_cvmctl &= ~CVMCTL_IPTI;
2783 guest_cvmctl |= 7ull << CVMCTL_IPTI_SHIFT;
2784 guest_cvmctl &= ~CVMCTL_IPPCI;
2785 guest_cvmctl |= 6ull << CVMCTL_IPPCI_SHIFT;
2786 write_gc0_cvmctl(guest_cvmctl);
2787
2788 cvmvmconfig = read_c0_cvmvmconfig();
2789 /* No I/O hole translation. */
2790 cvmvmconfig |= CVMVMCONF_DGHT;
2791 /* Halve the root MMU size */
2792 mmu_size = ((cvmvmconfig & CVMVMCONF_MMUSIZEM1)
2793 >> CVMVMCONF_MMUSIZEM1_S) + 1;
2794 guest_mmu_size = mmu_size / 2;
2795 mmu_size -= guest_mmu_size;
2796 cvmvmconfig &= ~CVMVMCONF_RMMUSIZEM1;
2797 cvmvmconfig |= mmu_size - 1;
2798 write_c0_cvmvmconfig(cvmvmconfig);
2799
2800 /* Update our records */
2801 current_cpu_data.tlbsize = mmu_size;
2802 current_cpu_data.tlbsizevtlb = mmu_size;
2803 current_cpu_data.guest.tlbsize = guest_mmu_size;
2804
2805 /* Flush moved entries in new (guest) context */
2806 kvm_vz_local_flush_guesttlb_all();
2807 break;
2808 default:
2809 /*
2810 * ImgTec cores tend to use a shared root/guest TLB. To avoid
2811 * overlap of root wired and guest entries, the guest TLB may
2812 * need resizing.
2813 */
2814 mmu_size = current_cpu_data.tlbsizevtlb;
2815 ftlb_size = current_cpu_data.tlbsize - mmu_size;
2816
2817 /* Try switching to maximum guest VTLB size for flush */
2818 guest_mmu_size = kvm_vz_resize_guest_vtlb(mmu_size);
2819 current_cpu_data.guest.tlbsize = guest_mmu_size + ftlb_size;
2820 kvm_vz_local_flush_guesttlb_all();
2821
2822 /*
2823 * Reduce to make space for root wired entries and at least 2
2824 * root non-wired entries. This does assume that long-term wired
2825 * entries won't be added later.
2826 */
2827 guest_mmu_size = mmu_size - num_wired_entries() - 2;
2828 guest_mmu_size = kvm_vz_resize_guest_vtlb(guest_mmu_size);
2829 current_cpu_data.guest.tlbsize = guest_mmu_size + ftlb_size;
2830
2831 /*
2832 * Write the VTLB size, but if another CPU has already written,
2833 * check it matches or we won't provide a consistent view to the
2834 * guest. If this ever happens it suggests an asymmetric number
2835 * of wired entries.
2836 */
2837 if (cmpxchg(&kvm_vz_guest_vtlb_size, 0, guest_mmu_size) &&
2838 WARN(guest_mmu_size != kvm_vz_guest_vtlb_size,
2839 "Available guest VTLB size mismatch"))
2840 return -EINVAL;
2841 break;
2842 }
2843
2844 /*
2845 * Enable virtualization features granting guest direct control of
2846 * certain features:
2847 * CP0=1: Guest coprocessor 0 context.
2848 * AT=Guest: Guest MMU.
2849 * CG=1: Hit (virtual address) CACHE operations (optional).
2850 * CF=1: Guest Config registers.
2851 * CGI=1: Indexed flush CACHE operations (optional).
2852 */
2853 write_c0_guestctl0(MIPS_GCTL0_CP0 |
2854 (MIPS_GCTL0_AT_GUEST << MIPS_GCTL0_AT_SHIFT) |
2855 MIPS_GCTL0_CG | MIPS_GCTL0_CF);
2856 if (cpu_has_guestctl0ext)
2857 set_c0_guestctl0ext(MIPS_GCTL0EXT_CGI);
2858
2859 if (cpu_has_guestid) {
2860 write_c0_guestctl1(0);
2861 kvm_vz_local_flush_roottlb_all_guests();
2862
2863 GUESTID_MASK = current_cpu_data.guestid_mask;
2864 GUESTID_FIRST_VERSION = GUESTID_MASK + 1;
2865 GUESTID_VERSION_MASK = ~GUESTID_MASK;
2866
2867 current_cpu_data.guestid_cache = GUESTID_FIRST_VERSION;
2868 }
2869
2870 /* clear any pending injected virtual guest interrupts */
2871 if (cpu_has_guestctl2)
2872 clear_c0_guestctl2(0x3f << 10);
2873
2874 return 0;
2875}
2876
2877static void kvm_vz_hardware_disable(void)
2878{
2879 u64 cvmvmconfig;
2880 unsigned int mmu_size;
2881
2882 /* Flush any remaining guest TLB entries */
2883 kvm_vz_local_flush_guesttlb_all();
2884
2885 switch (current_cpu_type()) {
2886 case CPU_CAVIUM_OCTEON3:
2887 /*
2888 * Allocate whole TLB for root. Existing guest TLB entries will
2889 * change ownership to the root TLB. We should be safe though as
2890 * they've already been flushed above while in guest TLB.
2891 */
2892 cvmvmconfig = read_c0_cvmvmconfig();
2893 mmu_size = ((cvmvmconfig & CVMVMCONF_MMUSIZEM1)
2894 >> CVMVMCONF_MMUSIZEM1_S) + 1;
2895 cvmvmconfig &= ~CVMVMCONF_RMMUSIZEM1;
2896 cvmvmconfig |= mmu_size - 1;
2897 write_c0_cvmvmconfig(cvmvmconfig);
2898
2899 /* Update our records */
2900 current_cpu_data.tlbsize = mmu_size;
2901 current_cpu_data.tlbsizevtlb = mmu_size;
2902 current_cpu_data.guest.tlbsize = 0;
2903
2904 /* Flush moved entries in new (root) context */
2905 local_flush_tlb_all();
2906 break;
2907 }
2908
2909 if (cpu_has_guestid) {
2910 write_c0_guestctl1(0);
2911 kvm_vz_local_flush_roottlb_all_guests();
2912 }
2913}
2914
2915static int kvm_vz_check_extension(struct kvm *kvm, long ext)
2916{
2917 int r;
2918
2919 switch (ext) {
2920 case KVM_CAP_MIPS_VZ:
2921 /* we wouldn't be here unless cpu_has_vz */
2922 r = 1;
2923 break;
2924#ifdef CONFIG_64BIT
2925 case KVM_CAP_MIPS_64BIT:
2926 /* We support 64-bit registers/operations and addresses */
2927 r = 2;
2928 break;
2929#endif
2930 default:
2931 r = 0;
2932 break;
2933 }
2934
2935 return r;
2936}
2937
2938static int kvm_vz_vcpu_init(struct kvm_vcpu *vcpu)
2939{
2940 int i;
2941
2942 for_each_possible_cpu(i)
2943 vcpu->arch.vzguestid[i] = 0;
2944
2945 return 0;
2946}
2947
2948static void kvm_vz_vcpu_uninit(struct kvm_vcpu *vcpu)
2949{
2950 int cpu;
2951
2952 /*
2953 * If the VCPU is freed and reused as another VCPU, we don't want the
2954 * matching pointer wrongly hanging around in last_vcpu[] or
2955 * last_exec_vcpu[].
2956 */
2957 for_each_possible_cpu(cpu) {
2958 if (last_vcpu[cpu] == vcpu)
2959 last_vcpu[cpu] = NULL;
2960 if (last_exec_vcpu[cpu] == vcpu)
2961 last_exec_vcpu[cpu] = NULL;
2962 }
2963}
2964
2965static int kvm_vz_vcpu_setup(struct kvm_vcpu *vcpu)
2966{
2967 struct mips_coproc *cop0 = vcpu->arch.cop0;
2968 unsigned long count_hz = 100*1000*1000; /* default to 100 MHz */
2969
2970 /*
2971 * Start off the timer at the same frequency as the host timer, but the
2972 * soft timer doesn't handle frequencies greater than 1GHz yet.
2973 */
2974 if (mips_hpt_frequency && mips_hpt_frequency <= NSEC_PER_SEC)
2975 count_hz = mips_hpt_frequency;
2976 kvm_mips_init_count(vcpu, count_hz);
2977
2978 /*
2979 * Initialize guest register state to valid architectural reset state.
2980 */
2981
2982 /* PageGrain */
2983 if (cpu_has_mips_r6)
2984 kvm_write_sw_gc0_pagegrain(cop0, PG_RIE | PG_XIE | PG_IEC);
2985 /* Wired */
2986 if (cpu_has_mips_r6)
2987 kvm_write_sw_gc0_wired(cop0,
2988 read_gc0_wired() & MIPSR6_WIRED_LIMIT);
2989 /* Status */
2990 kvm_write_sw_gc0_status(cop0, ST0_BEV | ST0_ERL);
2991 if (cpu_has_mips_r6)
2992 kvm_change_sw_gc0_status(cop0, ST0_FR, read_gc0_status());
2993 /* IntCtl */
2994 kvm_write_sw_gc0_intctl(cop0, read_gc0_intctl() &
2995 (INTCTLF_IPFDC | INTCTLF_IPPCI | INTCTLF_IPTI));
2996 /* PRId */
2997 kvm_write_sw_gc0_prid(cop0, boot_cpu_data.processor_id);
2998 /* EBase */
2999 kvm_write_sw_gc0_ebase(cop0, (s32)0x80000000 | vcpu->vcpu_id);
3000 /* Config */
3001 kvm_save_gc0_config(cop0);
3002 /* architecturally writable (e.g. from guest) */
3003 kvm_change_sw_gc0_config(cop0, CONF_CM_CMASK,
3004 _page_cachable_default >> _CACHE_SHIFT);
3005 /* architecturally read only, but maybe writable from root */
3006 kvm_change_sw_gc0_config(cop0, MIPS_CONF_MT, read_c0_config());
3007 if (cpu_guest_has_conf1) {
3008 kvm_set_sw_gc0_config(cop0, MIPS_CONF_M);
3009 /* Config1 */
3010 kvm_save_gc0_config1(cop0);
3011 /* architecturally read only, but maybe writable from root */
3012 kvm_clear_sw_gc0_config1(cop0, MIPS_CONF1_C2 |
3013 MIPS_CONF1_MD |
3014 MIPS_CONF1_PC |
3015 MIPS_CONF1_WR |
3016 MIPS_CONF1_CA |
3017 MIPS_CONF1_FP);
3018 }
3019 if (cpu_guest_has_conf2) {
3020 kvm_set_sw_gc0_config1(cop0, MIPS_CONF_M);
3021 /* Config2 */
3022 kvm_save_gc0_config2(cop0);
3023 }
3024 if (cpu_guest_has_conf3) {
3025 kvm_set_sw_gc0_config2(cop0, MIPS_CONF_M);
3026 /* Config3 */
3027 kvm_save_gc0_config3(cop0);
3028 /* architecturally writable (e.g. from guest) */
3029 kvm_clear_sw_gc0_config3(cop0, MIPS_CONF3_ISA_OE);
3030 /* architecturally read only, but maybe writable from root */
3031 kvm_clear_sw_gc0_config3(cop0, MIPS_CONF3_MSA |
3032 MIPS_CONF3_BPG |
3033 MIPS_CONF3_ULRI |
3034 MIPS_CONF3_DSP |
3035 MIPS_CONF3_CTXTC |
3036 MIPS_CONF3_ITL |
3037 MIPS_CONF3_LPA |
3038 MIPS_CONF3_VEIC |
3039 MIPS_CONF3_VINT |
3040 MIPS_CONF3_SP |
3041 MIPS_CONF3_CDMM |
3042 MIPS_CONF3_MT |
3043 MIPS_CONF3_SM |
3044 MIPS_CONF3_TL);
3045 }
3046 if (cpu_guest_has_conf4) {
3047 kvm_set_sw_gc0_config3(cop0, MIPS_CONF_M);
3048 /* Config4 */
3049 kvm_save_gc0_config4(cop0);
3050 }
3051 if (cpu_guest_has_conf5) {
3052 kvm_set_sw_gc0_config4(cop0, MIPS_CONF_M);
3053 /* Config5 */
3054 kvm_save_gc0_config5(cop0);
3055 /* architecturally writable (e.g. from guest) */
3056 kvm_clear_sw_gc0_config5(cop0, MIPS_CONF5_K |
3057 MIPS_CONF5_CV |
3058 MIPS_CONF5_MSAEN |
3059 MIPS_CONF5_UFE |
3060 MIPS_CONF5_FRE |
3061 MIPS_CONF5_SBRI |
3062 MIPS_CONF5_UFR);
3063 /* architecturally read only, but maybe writable from root */
3064 kvm_clear_sw_gc0_config5(cop0, MIPS_CONF5_MRP);
3065 }
3066
3067 if (cpu_guest_has_contextconfig) {
3068 /* ContextConfig */
3069 kvm_write_sw_gc0_contextconfig(cop0, 0x007ffff0);
3070#ifdef CONFIG_64BIT
3071 /* XContextConfig */
3072 /* bits SEGBITS-13+3:4 set */
3073 kvm_write_sw_gc0_xcontextconfig(cop0,
3074 ((1ull << (cpu_vmbits - 13)) - 1) << 4);
3075#endif
3076 }
3077
3078 /* Implementation dependent, use the legacy layout */
3079 if (cpu_guest_has_segments) {
3080 /* SegCtl0, SegCtl1, SegCtl2 */
3081 kvm_write_sw_gc0_segctl0(cop0, 0x00200010);
3082 kvm_write_sw_gc0_segctl1(cop0, 0x00000002 |
3083 (_page_cachable_default >> _CACHE_SHIFT) <<
3084 (16 + MIPS_SEGCFG_C_SHIFT));
3085 kvm_write_sw_gc0_segctl2(cop0, 0x00380438);
3086 }
3087
3088 /* reset HTW registers */
3089 if (cpu_guest_has_htw && cpu_has_mips_r6) {
3090 /* PWField */
3091 kvm_write_sw_gc0_pwfield(cop0, 0x0c30c302);
3092 /* PWSize */
3093 kvm_write_sw_gc0_pwsize(cop0, 1 << MIPS_PWSIZE_PTW_SHIFT);
3094 }
3095
3096 /* start with no pending virtual guest interrupts */
3097 if (cpu_has_guestctl2)
3098 cop0->reg[MIPS_CP0_GUESTCTL2][MIPS_CP0_GUESTCTL2_SEL] = 0;
3099
3100 /* Put PC at reset vector */
3101 vcpu->arch.pc = CKSEG1ADDR(0x1fc00000);
3102
3103 return 0;
3104}
3105
3106static void kvm_vz_flush_shadow_all(struct kvm *kvm)
3107{
3108 if (cpu_has_guestid) {
3109 /* Flush GuestID for each VCPU individually */
3110 kvm_flush_remote_tlbs(kvm);
3111 } else {
3112 /*
3113 * For each CPU there is a single GPA ASID used by all VCPUs in
3114 * the VM, so it doesn't make sense for the VCPUs to handle
3115 * invalidation of these ASIDs individually.
3116 *
3117 * Instead mark all CPUs as needing ASID invalidation in
3118 * asid_flush_mask, and just use kvm_flush_remote_tlbs(kvm) to
3119 * kick any running VCPUs so they check asid_flush_mask.
3120 */
3121 cpumask_setall(&kvm->arch.asid_flush_mask);
3122 kvm_flush_remote_tlbs(kvm);
3123 }
3124}
3125
3126static void kvm_vz_flush_shadow_memslot(struct kvm *kvm,
3127 const struct kvm_memory_slot *slot)
3128{
3129 kvm_vz_flush_shadow_all(kvm);
3130}
3131
3132static void kvm_vz_vcpu_reenter(struct kvm_run *run, struct kvm_vcpu *vcpu)
3133{
3134 int cpu = smp_processor_id();
3135 int preserve_guest_tlb;
3136
3137 preserve_guest_tlb = kvm_vz_check_requests(vcpu, cpu);
3138
3139 if (preserve_guest_tlb)
3140 kvm_vz_vcpu_save_wired(vcpu);
3141
3142 kvm_vz_vcpu_load_tlb(vcpu, cpu);
3143
3144 if (preserve_guest_tlb)
3145 kvm_vz_vcpu_load_wired(vcpu);
3146}
3147
3148static int kvm_vz_vcpu_run(struct kvm_run *run, struct kvm_vcpu *vcpu)
3149{
3150 int cpu = smp_processor_id();
3151 int r;
3152
3153 kvm_vz_acquire_htimer(vcpu);
3154 /* Check if we have any exceptions/interrupts pending */
3155 kvm_mips_deliver_interrupts(vcpu, read_gc0_cause());
3156
3157 kvm_vz_check_requests(vcpu, cpu);
3158 kvm_vz_vcpu_load_tlb(vcpu, cpu);
3159 kvm_vz_vcpu_load_wired(vcpu);
3160
3161 r = vcpu->arch.vcpu_run(run, vcpu);
3162
3163 kvm_vz_vcpu_save_wired(vcpu);
3164
3165 return r;
3166}
3167
3168static struct kvm_mips_callbacks kvm_vz_callbacks = {
3169 .handle_cop_unusable = kvm_trap_vz_handle_cop_unusable,
3170 .handle_tlb_mod = kvm_trap_vz_handle_tlb_st_miss,
3171 .handle_tlb_ld_miss = kvm_trap_vz_handle_tlb_ld_miss,
3172 .handle_tlb_st_miss = kvm_trap_vz_handle_tlb_st_miss,
3173 .handle_addr_err_st = kvm_trap_vz_no_handler,
3174 .handle_addr_err_ld = kvm_trap_vz_no_handler,
3175 .handle_syscall = kvm_trap_vz_no_handler,
3176 .handle_res_inst = kvm_trap_vz_no_handler,
3177 .handle_break = kvm_trap_vz_no_handler,
3178 .handle_msa_disabled = kvm_trap_vz_handle_msa_disabled,
3179 .handle_guest_exit = kvm_trap_vz_handle_guest_exit,
3180
3181 .hardware_enable = kvm_vz_hardware_enable,
3182 .hardware_disable = kvm_vz_hardware_disable,
3183 .check_extension = kvm_vz_check_extension,
3184 .vcpu_init = kvm_vz_vcpu_init,
3185 .vcpu_uninit = kvm_vz_vcpu_uninit,
3186 .vcpu_setup = kvm_vz_vcpu_setup,
3187 .flush_shadow_all = kvm_vz_flush_shadow_all,
3188 .flush_shadow_memslot = kvm_vz_flush_shadow_memslot,
3189 .gva_to_gpa = kvm_vz_gva_to_gpa_cb,
3190 .queue_timer_int = kvm_vz_queue_timer_int_cb,
3191 .dequeue_timer_int = kvm_vz_dequeue_timer_int_cb,
3192 .queue_io_int = kvm_vz_queue_io_int_cb,
3193 .dequeue_io_int = kvm_vz_dequeue_io_int_cb,
3194 .irq_deliver = kvm_vz_irq_deliver_cb,
3195 .irq_clear = kvm_vz_irq_clear_cb,
3196 .num_regs = kvm_vz_num_regs,
3197 .copy_reg_indices = kvm_vz_copy_reg_indices,
3198 .get_one_reg = kvm_vz_get_one_reg,
3199 .set_one_reg = kvm_vz_set_one_reg,
3200 .vcpu_load = kvm_vz_vcpu_load,
3201 .vcpu_put = kvm_vz_vcpu_put,
3202 .vcpu_run = kvm_vz_vcpu_run,
3203 .vcpu_reenter = kvm_vz_vcpu_reenter,
3204};
3205
3206int kvm_mips_emulation_init(struct kvm_mips_callbacks **install_callbacks)
3207{
3208 if (!cpu_has_vz)
3209 return -ENODEV;
3210
3211 /*
3212 * VZ requires at least 2 KScratch registers, so it should have been
3213 * possible to allocate pgd_reg.
3214 */
3215 if (WARN(pgd_reg == -1,
3216 "pgd_reg not allocated even though cpu_has_vz\n"))
3217 return -ENODEV;
3218
3219 pr_info("Starting KVM with MIPS VZ extensions\n");
3220
3221 *install_callbacks = &kvm_vz_callbacks;
3222 return 0;
3223}
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: Support for hardware virtualization extensions
7 *
8 * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
9 * Authors: Yann Le Du <ledu@kymasys.com>
10 */
11
12#include <linux/errno.h>
13#include <linux/err.h>
14#include <linux/module.h>
15#include <linux/preempt.h>
16#include <linux/vmalloc.h>
17#include <asm/cacheflush.h>
18#include <asm/cacheops.h>
19#include <asm/cmpxchg.h>
20#include <asm/fpu.h>
21#include <asm/hazards.h>
22#include <asm/inst.h>
23#include <asm/mmu_context.h>
24#include <asm/r4kcache.h>
25#include <asm/time.h>
26#include <asm/tlb.h>
27#include <asm/tlbex.h>
28
29#include <linux/kvm_host.h>
30
31#include "interrupt.h"
32#ifdef CONFIG_CPU_LOONGSON64
33#include "loongson_regs.h"
34#endif
35
36#include "trace.h"
37
38/* Pointers to last VCPU loaded on each physical CPU */
39static struct kvm_vcpu *last_vcpu[NR_CPUS];
40/* Pointers to last VCPU executed on each physical CPU */
41static struct kvm_vcpu *last_exec_vcpu[NR_CPUS];
42
43/*
44 * Number of guest VTLB entries to use, so we can catch inconsistency between
45 * CPUs.
46 */
47static unsigned int kvm_vz_guest_vtlb_size;
48
49static inline long kvm_vz_read_gc0_ebase(void)
50{
51 if (sizeof(long) == 8 && cpu_has_ebase_wg)
52 return read_gc0_ebase_64();
53 else
54 return read_gc0_ebase();
55}
56
57static inline void kvm_vz_write_gc0_ebase(long v)
58{
59 /*
60 * First write with WG=1 to write upper bits, then write again in case
61 * WG should be left at 0.
62 * write_gc0_ebase_64() is no longer UNDEFINED since R6.
63 */
64 if (sizeof(long) == 8 &&
65 (cpu_has_mips64r6 || cpu_has_ebase_wg)) {
66 write_gc0_ebase_64(v | MIPS_EBASE_WG);
67 write_gc0_ebase_64(v);
68 } else {
69 write_gc0_ebase(v | MIPS_EBASE_WG);
70 write_gc0_ebase(v);
71 }
72}
73
74/*
75 * These Config bits may be writable by the guest:
76 * Config: [K23, KU] (!TLB), K0
77 * Config1: (none)
78 * Config2: [TU, SU] (impl)
79 * Config3: ISAOnExc
80 * Config4: FTLBPageSize
81 * Config5: K, CV, MSAEn, UFE, FRE, SBRI, UFR
82 */
83
84static inline unsigned int kvm_vz_config_guest_wrmask(struct kvm_vcpu *vcpu)
85{
86 return CONF_CM_CMASK;
87}
88
89static inline unsigned int kvm_vz_config1_guest_wrmask(struct kvm_vcpu *vcpu)
90{
91 return 0;
92}
93
94static inline unsigned int kvm_vz_config2_guest_wrmask(struct kvm_vcpu *vcpu)
95{
96 return 0;
97}
98
99static inline unsigned int kvm_vz_config3_guest_wrmask(struct kvm_vcpu *vcpu)
100{
101 return MIPS_CONF3_ISA_OE;
102}
103
104static inline unsigned int kvm_vz_config4_guest_wrmask(struct kvm_vcpu *vcpu)
105{
106 /* no need to be exact */
107 return MIPS_CONF4_VFTLBPAGESIZE;
108}
109
110static inline unsigned int kvm_vz_config5_guest_wrmask(struct kvm_vcpu *vcpu)
111{
112 unsigned int mask = MIPS_CONF5_K | MIPS_CONF5_CV | MIPS_CONF5_SBRI;
113
114 /* Permit MSAEn changes if MSA supported and enabled */
115 if (kvm_mips_guest_has_msa(&vcpu->arch))
116 mask |= MIPS_CONF5_MSAEN;
117
118 /*
119 * Permit guest FPU mode changes if FPU is enabled and the relevant
120 * feature exists according to FIR register.
121 */
122 if (kvm_mips_guest_has_fpu(&vcpu->arch)) {
123 if (cpu_has_ufr)
124 mask |= MIPS_CONF5_UFR;
125 if (cpu_has_fre)
126 mask |= MIPS_CONF5_FRE | MIPS_CONF5_UFE;
127 }
128
129 return mask;
130}
131
132static inline unsigned int kvm_vz_config6_guest_wrmask(struct kvm_vcpu *vcpu)
133{
134 return LOONGSON_CONF6_INTIMER | LOONGSON_CONF6_EXTIMER;
135}
136
137/*
138 * VZ optionally allows these additional Config bits to be written by root:
139 * Config: M, [MT]
140 * Config1: M, [MMUSize-1, C2, MD, PC, WR, CA], FP
141 * Config2: M
142 * Config3: M, MSAP, [BPG], ULRI, [DSP2P, DSPP], CTXTC, [ITL, LPA, VEIC,
143 * VInt, SP, CDMM, MT, SM, TL]
144 * Config4: M, [VTLBSizeExt, MMUSizeExt]
145 * Config5: MRP
146 */
147
148static inline unsigned int kvm_vz_config_user_wrmask(struct kvm_vcpu *vcpu)
149{
150 return kvm_vz_config_guest_wrmask(vcpu) | MIPS_CONF_M;
151}
152
153static inline unsigned int kvm_vz_config1_user_wrmask(struct kvm_vcpu *vcpu)
154{
155 unsigned int mask = kvm_vz_config1_guest_wrmask(vcpu) | MIPS_CONF_M;
156
157 /* Permit FPU to be present if FPU is supported */
158 if (kvm_mips_guest_can_have_fpu(&vcpu->arch))
159 mask |= MIPS_CONF1_FP;
160
161 return mask;
162}
163
164static inline unsigned int kvm_vz_config2_user_wrmask(struct kvm_vcpu *vcpu)
165{
166 return kvm_vz_config2_guest_wrmask(vcpu) | MIPS_CONF_M;
167}
168
169static inline unsigned int kvm_vz_config3_user_wrmask(struct kvm_vcpu *vcpu)
170{
171 unsigned int mask = kvm_vz_config3_guest_wrmask(vcpu) | MIPS_CONF_M |
172 MIPS_CONF3_ULRI | MIPS_CONF3_CTXTC;
173
174 /* Permit MSA to be present if MSA is supported */
175 if (kvm_mips_guest_can_have_msa(&vcpu->arch))
176 mask |= MIPS_CONF3_MSA;
177
178 return mask;
179}
180
181static inline unsigned int kvm_vz_config4_user_wrmask(struct kvm_vcpu *vcpu)
182{
183 return kvm_vz_config4_guest_wrmask(vcpu) | MIPS_CONF_M;
184}
185
186static inline unsigned int kvm_vz_config5_user_wrmask(struct kvm_vcpu *vcpu)
187{
188 return kvm_vz_config5_guest_wrmask(vcpu) | MIPS_CONF5_MRP;
189}
190
191static inline unsigned int kvm_vz_config6_user_wrmask(struct kvm_vcpu *vcpu)
192{
193 return kvm_vz_config6_guest_wrmask(vcpu) |
194 LOONGSON_CONF6_SFBEN | LOONGSON_CONF6_FTLBDIS;
195}
196
197static gpa_t kvm_vz_gva_to_gpa_cb(gva_t gva)
198{
199 /* VZ guest has already converted gva to gpa */
200 return gva;
201}
202
203static void kvm_vz_queue_irq(struct kvm_vcpu *vcpu, unsigned int priority)
204{
205 set_bit(priority, &vcpu->arch.pending_exceptions);
206 clear_bit(priority, &vcpu->arch.pending_exceptions_clr);
207}
208
209static void kvm_vz_dequeue_irq(struct kvm_vcpu *vcpu, unsigned int priority)
210{
211 clear_bit(priority, &vcpu->arch.pending_exceptions);
212 set_bit(priority, &vcpu->arch.pending_exceptions_clr);
213}
214
215static void kvm_vz_queue_timer_int_cb(struct kvm_vcpu *vcpu)
216{
217 /*
218 * timer expiry is asynchronous to vcpu execution therefore defer guest
219 * cp0 accesses
220 */
221 kvm_vz_queue_irq(vcpu, MIPS_EXC_INT_TIMER);
222}
223
224static void kvm_vz_dequeue_timer_int_cb(struct kvm_vcpu *vcpu)
225{
226 /*
227 * timer expiry is asynchronous to vcpu execution therefore defer guest
228 * cp0 accesses
229 */
230 kvm_vz_dequeue_irq(vcpu, MIPS_EXC_INT_TIMER);
231}
232
233static void kvm_vz_queue_io_int_cb(struct kvm_vcpu *vcpu,
234 struct kvm_mips_interrupt *irq)
235{
236 int intr = (int)irq->irq;
237
238 /*
239 * interrupts are asynchronous to vcpu execution therefore defer guest
240 * cp0 accesses
241 */
242 kvm_vz_queue_irq(vcpu, kvm_irq_to_priority(intr));
243}
244
245static void kvm_vz_dequeue_io_int_cb(struct kvm_vcpu *vcpu,
246 struct kvm_mips_interrupt *irq)
247{
248 int intr = (int)irq->irq;
249
250 /*
251 * interrupts are asynchronous to vcpu execution therefore defer guest
252 * cp0 accesses
253 */
254 kvm_vz_dequeue_irq(vcpu, kvm_irq_to_priority(-intr));
255}
256
257static int kvm_vz_irq_deliver_cb(struct kvm_vcpu *vcpu, unsigned int priority,
258 u32 cause)
259{
260 u32 irq = (priority < MIPS_EXC_MAX) ?
261 kvm_priority_to_irq[priority] : 0;
262
263 switch (priority) {
264 case MIPS_EXC_INT_TIMER:
265 set_gc0_cause(C_TI);
266 break;
267
268 case MIPS_EXC_INT_IO_1:
269 case MIPS_EXC_INT_IO_2:
270 case MIPS_EXC_INT_IPI_1:
271 case MIPS_EXC_INT_IPI_2:
272 if (cpu_has_guestctl2)
273 set_c0_guestctl2(irq);
274 else
275 set_gc0_cause(irq);
276 break;
277
278 default:
279 break;
280 }
281
282 clear_bit(priority, &vcpu->arch.pending_exceptions);
283 return 1;
284}
285
286static int kvm_vz_irq_clear_cb(struct kvm_vcpu *vcpu, unsigned int priority,
287 u32 cause)
288{
289 u32 irq = (priority < MIPS_EXC_MAX) ?
290 kvm_priority_to_irq[priority] : 0;
291
292 switch (priority) {
293 case MIPS_EXC_INT_TIMER:
294 /*
295 * Explicitly clear irq associated with Cause.IP[IPTI]
296 * if GuestCtl2 virtual interrupt register not
297 * supported or if not using GuestCtl2 Hardware Clear.
298 */
299 if (cpu_has_guestctl2) {
300 if (!(read_c0_guestctl2() & (irq << 14)))
301 clear_c0_guestctl2(irq);
302 } else {
303 clear_gc0_cause(irq);
304 }
305 break;
306
307 case MIPS_EXC_INT_IO_1:
308 case MIPS_EXC_INT_IO_2:
309 case MIPS_EXC_INT_IPI_1:
310 case MIPS_EXC_INT_IPI_2:
311 /* Clear GuestCtl2.VIP irq if not using Hardware Clear */
312 if (cpu_has_guestctl2) {
313 if (!(read_c0_guestctl2() & (irq << 14)))
314 clear_c0_guestctl2(irq);
315 } else {
316 clear_gc0_cause(irq);
317 }
318 break;
319
320 default:
321 break;
322 }
323
324 clear_bit(priority, &vcpu->arch.pending_exceptions_clr);
325 return 1;
326}
327
328/*
329 * VZ guest timer handling.
330 */
331
332/**
333 * kvm_vz_should_use_htimer() - Find whether to use the VZ hard guest timer.
334 * @vcpu: Virtual CPU.
335 *
336 * Returns: true if the VZ GTOffset & real guest CP0_Count should be used
337 * instead of software emulation of guest timer.
338 * false otherwise.
339 */
340static bool kvm_vz_should_use_htimer(struct kvm_vcpu *vcpu)
341{
342 if (kvm_mips_count_disabled(vcpu))
343 return false;
344
345 /* Chosen frequency must match real frequency */
346 if (mips_hpt_frequency != vcpu->arch.count_hz)
347 return false;
348
349 /* We don't support a CP0_GTOffset with fewer bits than CP0_Count */
350 if (current_cpu_data.gtoffset_mask != 0xffffffff)
351 return false;
352
353 return true;
354}
355
356/**
357 * _kvm_vz_restore_stimer() - Restore soft timer state.
358 * @vcpu: Virtual CPU.
359 * @compare: CP0_Compare register value, restored by caller.
360 * @cause: CP0_Cause register to restore.
361 *
362 * Restore VZ state relating to the soft timer. The hard timer can be enabled
363 * later.
364 */
365static void _kvm_vz_restore_stimer(struct kvm_vcpu *vcpu, u32 compare,
366 u32 cause)
367{
368 /*
369 * Avoid spurious counter interrupts by setting Guest CP0_Count to just
370 * after Guest CP0_Compare.
371 */
372 write_c0_gtoffset(compare - read_c0_count());
373
374 back_to_back_c0_hazard();
375 write_gc0_cause(cause);
376}
377
378/**
379 * _kvm_vz_restore_htimer() - Restore hard timer state.
380 * @vcpu: Virtual CPU.
381 * @compare: CP0_Compare register value, restored by caller.
382 * @cause: CP0_Cause register to restore.
383 *
384 * Restore hard timer Guest.Count & Guest.Cause taking care to preserve the
385 * value of Guest.CP0_Cause.TI while restoring Guest.CP0_Cause.
386 */
387static void _kvm_vz_restore_htimer(struct kvm_vcpu *vcpu,
388 u32 compare, u32 cause)
389{
390 u32 start_count, after_count;
391 unsigned long flags;
392
393 /*
394 * Freeze the soft-timer and sync the guest CP0_Count with it. We do
395 * this with interrupts disabled to avoid latency.
396 */
397 local_irq_save(flags);
398 kvm_mips_freeze_hrtimer(vcpu, &start_count);
399 write_c0_gtoffset(start_count - read_c0_count());
400 local_irq_restore(flags);
401
402 /* restore guest CP0_Cause, as TI may already be set */
403 back_to_back_c0_hazard();
404 write_gc0_cause(cause);
405
406 /*
407 * The above sequence isn't atomic and would result in lost timer
408 * interrupts if we're not careful. Detect if a timer interrupt is due
409 * and assert it.
410 */
411 back_to_back_c0_hazard();
412 after_count = read_gc0_count();
413 if (after_count - start_count > compare - start_count - 1)
414 kvm_vz_queue_irq(vcpu, MIPS_EXC_INT_TIMER);
415}
416
417/**
418 * kvm_vz_restore_timer() - Restore timer state.
419 * @vcpu: Virtual CPU.
420 *
421 * Restore soft timer state from saved context.
422 */
423static void kvm_vz_restore_timer(struct kvm_vcpu *vcpu)
424{
425 struct mips_coproc *cop0 = vcpu->arch.cop0;
426 u32 cause, compare;
427
428 compare = kvm_read_sw_gc0_compare(cop0);
429 cause = kvm_read_sw_gc0_cause(cop0);
430
431 write_gc0_compare(compare);
432 _kvm_vz_restore_stimer(vcpu, compare, cause);
433}
434
435/**
436 * kvm_vz_acquire_htimer() - Switch to hard timer state.
437 * @vcpu: Virtual CPU.
438 *
439 * Restore hard timer state on top of existing soft timer state if possible.
440 *
441 * Since hard timer won't remain active over preemption, preemption should be
442 * disabled by the caller.
443 */
444void kvm_vz_acquire_htimer(struct kvm_vcpu *vcpu)
445{
446 u32 gctl0;
447
448 gctl0 = read_c0_guestctl0();
449 if (!(gctl0 & MIPS_GCTL0_GT) && kvm_vz_should_use_htimer(vcpu)) {
450 /* enable guest access to hard timer */
451 write_c0_guestctl0(gctl0 | MIPS_GCTL0_GT);
452
453 _kvm_vz_restore_htimer(vcpu, read_gc0_compare(),
454 read_gc0_cause());
455 }
456}
457
458/**
459 * _kvm_vz_save_htimer() - Switch to software emulation of guest timer.
460 * @vcpu: Virtual CPU.
461 * @out_compare: Pointer to write compare value to.
462 * @out_cause: Pointer to write cause value to.
463 *
464 * Save VZ guest timer state and switch to software emulation of guest CP0
465 * timer. The hard timer must already be in use, so preemption should be
466 * disabled.
467 */
468static void _kvm_vz_save_htimer(struct kvm_vcpu *vcpu,
469 u32 *out_compare, u32 *out_cause)
470{
471 u32 cause, compare, before_count, end_count;
472 ktime_t before_time;
473
474 compare = read_gc0_compare();
475 *out_compare = compare;
476
477 before_time = ktime_get();
478
479 /*
480 * Record the CP0_Count *prior* to saving CP0_Cause, so we have a time
481 * at which no pending timer interrupt is missing.
482 */
483 before_count = read_gc0_count();
484 back_to_back_c0_hazard();
485 cause = read_gc0_cause();
486 *out_cause = cause;
487
488 /*
489 * Record a final CP0_Count which we will transfer to the soft-timer.
490 * This is recorded *after* saving CP0_Cause, so we don't get any timer
491 * interrupts from just after the final CP0_Count point.
492 */
493 back_to_back_c0_hazard();
494 end_count = read_gc0_count();
495
496 /*
497 * The above sequence isn't atomic, so we could miss a timer interrupt
498 * between reading CP0_Cause and end_count. Detect and record any timer
499 * interrupt due between before_count and end_count.
500 */
501 if (end_count - before_count > compare - before_count - 1)
502 kvm_vz_queue_irq(vcpu, MIPS_EXC_INT_TIMER);
503
504 /*
505 * Restore soft-timer, ignoring a small amount of negative drift due to
506 * delay between freeze_hrtimer and setting CP0_GTOffset.
507 */
508 kvm_mips_restore_hrtimer(vcpu, before_time, end_count, -0x10000);
509}
510
511/**
512 * kvm_vz_save_timer() - Save guest timer state.
513 * @vcpu: Virtual CPU.
514 *
515 * Save VZ guest timer state and switch to soft guest timer if hard timer was in
516 * use.
517 */
518static void kvm_vz_save_timer(struct kvm_vcpu *vcpu)
519{
520 struct mips_coproc *cop0 = vcpu->arch.cop0;
521 u32 gctl0, compare, cause;
522
523 gctl0 = read_c0_guestctl0();
524 if (gctl0 & MIPS_GCTL0_GT) {
525 /* disable guest use of hard timer */
526 write_c0_guestctl0(gctl0 & ~MIPS_GCTL0_GT);
527
528 /* save hard timer state */
529 _kvm_vz_save_htimer(vcpu, &compare, &cause);
530 } else {
531 compare = read_gc0_compare();
532 cause = read_gc0_cause();
533 }
534
535 /* save timer-related state to VCPU context */
536 kvm_write_sw_gc0_cause(cop0, cause);
537 kvm_write_sw_gc0_compare(cop0, compare);
538}
539
540/**
541 * kvm_vz_lose_htimer() - Ensure hard guest timer is not in use.
542 * @vcpu: Virtual CPU.
543 *
544 * Transfers the state of the hard guest timer to the soft guest timer, leaving
545 * guest state intact so it can continue to be used with the soft timer.
546 */
547void kvm_vz_lose_htimer(struct kvm_vcpu *vcpu)
548{
549 u32 gctl0, compare, cause;
550
551 preempt_disable();
552 gctl0 = read_c0_guestctl0();
553 if (gctl0 & MIPS_GCTL0_GT) {
554 /* disable guest use of timer */
555 write_c0_guestctl0(gctl0 & ~MIPS_GCTL0_GT);
556
557 /* switch to soft timer */
558 _kvm_vz_save_htimer(vcpu, &compare, &cause);
559
560 /* leave soft timer in usable state */
561 _kvm_vz_restore_stimer(vcpu, compare, cause);
562 }
563 preempt_enable();
564}
565
566/**
567 * is_eva_access() - Find whether an instruction is an EVA memory accessor.
568 * @inst: 32-bit instruction encoding.
569 *
570 * Finds whether @inst encodes an EVA memory access instruction, which would
571 * indicate that emulation of it should access the user mode address space
572 * instead of the kernel mode address space. This matters for MUSUK segments
573 * which are TLB mapped for user mode but unmapped for kernel mode.
574 *
575 * Returns: Whether @inst encodes an EVA accessor instruction.
576 */
577static bool is_eva_access(union mips_instruction inst)
578{
579 if (inst.spec3_format.opcode != spec3_op)
580 return false;
581
582 switch (inst.spec3_format.func) {
583 case lwle_op:
584 case lwre_op:
585 case cachee_op:
586 case sbe_op:
587 case she_op:
588 case sce_op:
589 case swe_op:
590 case swle_op:
591 case swre_op:
592 case prefe_op:
593 case lbue_op:
594 case lhue_op:
595 case lbe_op:
596 case lhe_op:
597 case lle_op:
598 case lwe_op:
599 return true;
600 default:
601 return false;
602 }
603}
604
605/**
606 * is_eva_am_mapped() - Find whether an access mode is mapped.
607 * @vcpu: KVM VCPU state.
608 * @am: 3-bit encoded access mode.
609 * @eu: Segment becomes unmapped and uncached when Status.ERL=1.
610 *
611 * Decode @am to find whether it encodes a mapped segment for the current VCPU
612 * state. Where necessary @eu and the actual instruction causing the fault are
613 * taken into account to make the decision.
614 *
615 * Returns: Whether the VCPU faulted on a TLB mapped address.
616 */
617static bool is_eva_am_mapped(struct kvm_vcpu *vcpu, unsigned int am, bool eu)
618{
619 u32 am_lookup;
620 int err;
621
622 /*
623 * Interpret access control mode. We assume address errors will already
624 * have been caught by the guest, leaving us with:
625 * AM UM SM KM 31..24 23..16
626 * UK 0 000 Unm 0 0
627 * MK 1 001 TLB 1
628 * MSK 2 010 TLB TLB 1
629 * MUSK 3 011 TLB TLB TLB 1
630 * MUSUK 4 100 TLB TLB Unm 0 1
631 * USK 5 101 Unm Unm 0 0
632 * - 6 110 0 0
633 * UUSK 7 111 Unm Unm Unm 0 0
634 *
635 * We shift a magic value by AM across the sign bit to find if always
636 * TLB mapped, and if not shift by 8 again to find if it depends on KM.
637 */
638 am_lookup = 0x70080000 << am;
639 if ((s32)am_lookup < 0) {
640 /*
641 * MK, MSK, MUSK
642 * Always TLB mapped, unless SegCtl.EU && ERL
643 */
644 if (!eu || !(read_gc0_status() & ST0_ERL))
645 return true;
646 } else {
647 am_lookup <<= 8;
648 if ((s32)am_lookup < 0) {
649 union mips_instruction inst;
650 unsigned int status;
651 u32 *opc;
652
653 /*
654 * MUSUK
655 * TLB mapped if not in kernel mode
656 */
657 status = read_gc0_status();
658 if (!(status & (ST0_EXL | ST0_ERL)) &&
659 (status & ST0_KSU))
660 return true;
661 /*
662 * EVA access instructions in kernel
663 * mode access user address space.
664 */
665 opc = (u32 *)vcpu->arch.pc;
666 if (vcpu->arch.host_cp0_cause & CAUSEF_BD)
667 opc += 1;
668 err = kvm_get_badinstr(opc, vcpu, &inst.word);
669 if (!err && is_eva_access(inst))
670 return true;
671 }
672 }
673
674 return false;
675}
676
677/**
678 * kvm_vz_gva_to_gpa() - Convert valid GVA to GPA.
679 * @vcpu: KVM VCPU state.
680 * @gva: Guest virtual address to convert.
681 * @gpa: Output guest physical address.
682 *
683 * Convert a guest virtual address (GVA) which is valid according to the guest
684 * context, to a guest physical address (GPA).
685 *
686 * Returns: 0 on success.
687 * -errno on failure.
688 */
689static int kvm_vz_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva,
690 unsigned long *gpa)
691{
692 u32 gva32 = gva;
693 unsigned long segctl;
694
695 if ((long)gva == (s32)gva32) {
696 /* Handle canonical 32-bit virtual address */
697 if (cpu_guest_has_segments) {
698 unsigned long mask, pa;
699
700 switch (gva32 >> 29) {
701 case 0:
702 case 1: /* CFG5 (1GB) */
703 segctl = read_gc0_segctl2() >> 16;
704 mask = (unsigned long)0xfc0000000ull;
705 break;
706 case 2:
707 case 3: /* CFG4 (1GB) */
708 segctl = read_gc0_segctl2();
709 mask = (unsigned long)0xfc0000000ull;
710 break;
711 case 4: /* CFG3 (512MB) */
712 segctl = read_gc0_segctl1() >> 16;
713 mask = (unsigned long)0xfe0000000ull;
714 break;
715 case 5: /* CFG2 (512MB) */
716 segctl = read_gc0_segctl1();
717 mask = (unsigned long)0xfe0000000ull;
718 break;
719 case 6: /* CFG1 (512MB) */
720 segctl = read_gc0_segctl0() >> 16;
721 mask = (unsigned long)0xfe0000000ull;
722 break;
723 case 7: /* CFG0 (512MB) */
724 segctl = read_gc0_segctl0();
725 mask = (unsigned long)0xfe0000000ull;
726 break;
727 default:
728 /*
729 * GCC 4.9 isn't smart enough to figure out that
730 * segctl and mask are always initialised.
731 */
732 unreachable();
733 }
734
735 if (is_eva_am_mapped(vcpu, (segctl >> 4) & 0x7,
736 segctl & 0x0008))
737 goto tlb_mapped;
738
739 /* Unmapped, find guest physical address */
740 pa = (segctl << 20) & mask;
741 pa |= gva32 & ~mask;
742 *gpa = pa;
743 return 0;
744 } else if ((s32)gva32 < (s32)0xc0000000) {
745 /* legacy unmapped KSeg0 or KSeg1 */
746 *gpa = gva32 & 0x1fffffff;
747 return 0;
748 }
749#ifdef CONFIG_64BIT
750 } else if ((gva & 0xc000000000000000) == 0x8000000000000000) {
751 /* XKPHYS */
752 if (cpu_guest_has_segments) {
753 /*
754 * Each of the 8 regions can be overridden by SegCtl2.XR
755 * to use SegCtl1.XAM.
756 */
757 segctl = read_gc0_segctl2();
758 if (segctl & (1ull << (56 + ((gva >> 59) & 0x7)))) {
759 segctl = read_gc0_segctl1();
760 if (is_eva_am_mapped(vcpu, (segctl >> 59) & 0x7,
761 0))
762 goto tlb_mapped;
763 }
764
765 }
766 /*
767 * Traditionally fully unmapped.
768 * Bits 61:59 specify the CCA, which we can just mask off here.
769 * Bits 58:PABITS should be zero, but we shouldn't have got here
770 * if it wasn't.
771 */
772 *gpa = gva & 0x07ffffffffffffff;
773 return 0;
774#endif
775 }
776
777tlb_mapped:
778 return kvm_vz_guest_tlb_lookup(vcpu, gva, gpa);
779}
780
781/**
782 * kvm_vz_badvaddr_to_gpa() - Convert GVA BadVAddr from root exception to GPA.
783 * @vcpu: KVM VCPU state.
784 * @badvaddr: Root BadVAddr.
785 * @gpa: Output guest physical address.
786 *
787 * VZ implementations are permitted to report guest virtual addresses (GVA) in
788 * BadVAddr on a root exception during guest execution, instead of the more
789 * convenient guest physical addresses (GPA). When we get a GVA, this function
790 * converts it to a GPA, taking into account guest segmentation and guest TLB
791 * state.
792 *
793 * Returns: 0 on success.
794 * -errno on failure.
795 */
796static int kvm_vz_badvaddr_to_gpa(struct kvm_vcpu *vcpu, unsigned long badvaddr,
797 unsigned long *gpa)
798{
799 unsigned int gexccode = (vcpu->arch.host_cp0_guestctl0 &
800 MIPS_GCTL0_GEXC) >> MIPS_GCTL0_GEXC_SHIFT;
801
802 /* If BadVAddr is GPA, then all is well in the world */
803 if (likely(gexccode == MIPS_GCTL0_GEXC_GPA)) {
804 *gpa = badvaddr;
805 return 0;
806 }
807
808 /* Otherwise we'd expect it to be GVA ... */
809 if (WARN(gexccode != MIPS_GCTL0_GEXC_GVA,
810 "Unexpected gexccode %#x\n", gexccode))
811 return -EINVAL;
812
813 /* ... and we need to perform the GVA->GPA translation in software */
814 return kvm_vz_gva_to_gpa(vcpu, badvaddr, gpa);
815}
816
817static int kvm_trap_vz_no_handler(struct kvm_vcpu *vcpu)
818{
819 u32 *opc = (u32 *) vcpu->arch.pc;
820 u32 cause = vcpu->arch.host_cp0_cause;
821 u32 exccode = (cause & CAUSEF_EXCCODE) >> CAUSEB_EXCCODE;
822 unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr;
823 u32 inst = 0;
824
825 /*
826 * Fetch the instruction.
827 */
828 if (cause & CAUSEF_BD)
829 opc += 1;
830 kvm_get_badinstr(opc, vcpu, &inst);
831
832 kvm_err("Exception Code: %d not handled @ PC: %p, inst: 0x%08x BadVaddr: %#lx Status: %#x\n",
833 exccode, opc, inst, badvaddr,
834 read_gc0_status());
835 kvm_arch_vcpu_dump_regs(vcpu);
836 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
837 return RESUME_HOST;
838}
839
840static unsigned long mips_process_maar(unsigned int op, unsigned long val)
841{
842 /* Mask off unused bits */
843 unsigned long mask = 0xfffff000 | MIPS_MAAR_S | MIPS_MAAR_VL;
844
845 if (read_gc0_pagegrain() & PG_ELPA)
846 mask |= 0x00ffffff00000000ull;
847 if (cpu_guest_has_mvh)
848 mask |= MIPS_MAAR_VH;
849
850 /* Set or clear VH */
851 if (op == mtc_op) {
852 /* clear VH */
853 val &= ~MIPS_MAAR_VH;
854 } else if (op == dmtc_op) {
855 /* set VH to match VL */
856 val &= ~MIPS_MAAR_VH;
857 if (val & MIPS_MAAR_VL)
858 val |= MIPS_MAAR_VH;
859 }
860
861 return val & mask;
862}
863
864static void kvm_write_maari(struct kvm_vcpu *vcpu, unsigned long val)
865{
866 struct mips_coproc *cop0 = vcpu->arch.cop0;
867
868 val &= MIPS_MAARI_INDEX;
869 if (val == MIPS_MAARI_INDEX)
870 kvm_write_sw_gc0_maari(cop0, ARRAY_SIZE(vcpu->arch.maar) - 1);
871 else if (val < ARRAY_SIZE(vcpu->arch.maar))
872 kvm_write_sw_gc0_maari(cop0, val);
873}
874
875static enum emulation_result kvm_vz_gpsi_cop0(union mips_instruction inst,
876 u32 *opc, u32 cause,
877 struct kvm_vcpu *vcpu)
878{
879 struct mips_coproc *cop0 = vcpu->arch.cop0;
880 enum emulation_result er = EMULATE_DONE;
881 u32 rt, rd, sel;
882 unsigned long curr_pc;
883 unsigned long val;
884
885 /*
886 * Update PC and hold onto current PC in case there is
887 * an error and we want to rollback the PC
888 */
889 curr_pc = vcpu->arch.pc;
890 er = update_pc(vcpu, cause);
891 if (er == EMULATE_FAIL)
892 return er;
893
894 if (inst.co_format.co) {
895 switch (inst.co_format.func) {
896 case wait_op:
897 er = kvm_mips_emul_wait(vcpu);
898 break;
899 default:
900 er = EMULATE_FAIL;
901 }
902 } else {
903 rt = inst.c0r_format.rt;
904 rd = inst.c0r_format.rd;
905 sel = inst.c0r_format.sel;
906
907 switch (inst.c0r_format.rs) {
908 case dmfc_op:
909 case mfc_op:
910#ifdef CONFIG_KVM_MIPS_DEBUG_COP0_COUNTERS
911 cop0->stat[rd][sel]++;
912#endif
913 if (rd == MIPS_CP0_COUNT &&
914 sel == 0) { /* Count */
915 val = kvm_mips_read_count(vcpu);
916 } else if (rd == MIPS_CP0_COMPARE &&
917 sel == 0) { /* Compare */
918 val = read_gc0_compare();
919 } else if (rd == MIPS_CP0_LLADDR &&
920 sel == 0) { /* LLAddr */
921 if (cpu_guest_has_rw_llb)
922 val = read_gc0_lladdr() &
923 MIPS_LLADDR_LLB;
924 else
925 val = 0;
926 } else if (rd == MIPS_CP0_LLADDR &&
927 sel == 1 && /* MAAR */
928 cpu_guest_has_maar &&
929 !cpu_guest_has_dyn_maar) {
930 /* MAARI must be in range */
931 BUG_ON(kvm_read_sw_gc0_maari(cop0) >=
932 ARRAY_SIZE(vcpu->arch.maar));
933 val = vcpu->arch.maar[
934 kvm_read_sw_gc0_maari(cop0)];
935 } else if ((rd == MIPS_CP0_PRID &&
936 (sel == 0 || /* PRid */
937 sel == 2 || /* CDMMBase */
938 sel == 3)) || /* CMGCRBase */
939 (rd == MIPS_CP0_STATUS &&
940 (sel == 2 || /* SRSCtl */
941 sel == 3)) || /* SRSMap */
942 (rd == MIPS_CP0_CONFIG &&
943 (sel == 6 || /* Config6 */
944 sel == 7)) || /* Config7 */
945 (rd == MIPS_CP0_LLADDR &&
946 (sel == 2) && /* MAARI */
947 cpu_guest_has_maar &&
948 !cpu_guest_has_dyn_maar) ||
949 (rd == MIPS_CP0_ERRCTL &&
950 (sel == 0))) { /* ErrCtl */
951 val = cop0->reg[rd][sel];
952#ifdef CONFIG_CPU_LOONGSON64
953 } else if (rd == MIPS_CP0_DIAG &&
954 (sel == 0)) { /* Diag */
955 val = cop0->reg[rd][sel];
956#endif
957 } else {
958 val = 0;
959 er = EMULATE_FAIL;
960 }
961
962 if (er != EMULATE_FAIL) {
963 /* Sign extend */
964 if (inst.c0r_format.rs == mfc_op)
965 val = (int)val;
966 vcpu->arch.gprs[rt] = val;
967 }
968
969 trace_kvm_hwr(vcpu, (inst.c0r_format.rs == mfc_op) ?
970 KVM_TRACE_MFC0 : KVM_TRACE_DMFC0,
971 KVM_TRACE_COP0(rd, sel), val);
972 break;
973
974 case dmtc_op:
975 case mtc_op:
976#ifdef CONFIG_KVM_MIPS_DEBUG_COP0_COUNTERS
977 cop0->stat[rd][sel]++;
978#endif
979 val = vcpu->arch.gprs[rt];
980 trace_kvm_hwr(vcpu, (inst.c0r_format.rs == mtc_op) ?
981 KVM_TRACE_MTC0 : KVM_TRACE_DMTC0,
982 KVM_TRACE_COP0(rd, sel), val);
983
984 if (rd == MIPS_CP0_COUNT &&
985 sel == 0) { /* Count */
986 kvm_vz_lose_htimer(vcpu);
987 kvm_mips_write_count(vcpu, vcpu->arch.gprs[rt]);
988 } else if (rd == MIPS_CP0_COMPARE &&
989 sel == 0) { /* Compare */
990 kvm_mips_write_compare(vcpu,
991 vcpu->arch.gprs[rt],
992 true);
993 } else if (rd == MIPS_CP0_LLADDR &&
994 sel == 0) { /* LLAddr */
995 /*
996 * P5600 generates GPSI on guest MTC0 LLAddr.
997 * Only allow the guest to clear LLB.
998 */
999 if (cpu_guest_has_rw_llb &&
1000 !(val & MIPS_LLADDR_LLB))
1001 write_gc0_lladdr(0);
1002 } else if (rd == MIPS_CP0_LLADDR &&
1003 sel == 1 && /* MAAR */
1004 cpu_guest_has_maar &&
1005 !cpu_guest_has_dyn_maar) {
1006 val = mips_process_maar(inst.c0r_format.rs,
1007 val);
1008
1009 /* MAARI must be in range */
1010 BUG_ON(kvm_read_sw_gc0_maari(cop0) >=
1011 ARRAY_SIZE(vcpu->arch.maar));
1012 vcpu->arch.maar[kvm_read_sw_gc0_maari(cop0)] =
1013 val;
1014 } else if (rd == MIPS_CP0_LLADDR &&
1015 (sel == 2) && /* MAARI */
1016 cpu_guest_has_maar &&
1017 !cpu_guest_has_dyn_maar) {
1018 kvm_write_maari(vcpu, val);
1019 } else if (rd == MIPS_CP0_CONFIG &&
1020 (sel == 6)) {
1021 cop0->reg[rd][sel] = (int)val;
1022 } else if (rd == MIPS_CP0_ERRCTL &&
1023 (sel == 0)) { /* ErrCtl */
1024 /* ignore the written value */
1025#ifdef CONFIG_CPU_LOONGSON64
1026 } else if (rd == MIPS_CP0_DIAG &&
1027 (sel == 0)) { /* Diag */
1028 unsigned long flags;
1029
1030 local_irq_save(flags);
1031 if (val & LOONGSON_DIAG_BTB) {
1032 /* Flush BTB */
1033 set_c0_diag(LOONGSON_DIAG_BTB);
1034 }
1035 if (val & LOONGSON_DIAG_ITLB) {
1036 /* Flush ITLB */
1037 set_c0_diag(LOONGSON_DIAG_ITLB);
1038 }
1039 if (val & LOONGSON_DIAG_DTLB) {
1040 /* Flush DTLB */
1041 set_c0_diag(LOONGSON_DIAG_DTLB);
1042 }
1043 if (val & LOONGSON_DIAG_VTLB) {
1044 /* Flush VTLB */
1045 kvm_loongson_clear_guest_vtlb();
1046 }
1047 if (val & LOONGSON_DIAG_FTLB) {
1048 /* Flush FTLB */
1049 kvm_loongson_clear_guest_ftlb();
1050 }
1051 local_irq_restore(flags);
1052#endif
1053 } else {
1054 er = EMULATE_FAIL;
1055 }
1056 break;
1057
1058 default:
1059 er = EMULATE_FAIL;
1060 break;
1061 }
1062 }
1063 /* Rollback PC only if emulation was unsuccessful */
1064 if (er == EMULATE_FAIL) {
1065 kvm_err("[%#lx]%s: unsupported cop0 instruction 0x%08x\n",
1066 curr_pc, __func__, inst.word);
1067
1068 vcpu->arch.pc = curr_pc;
1069 }
1070
1071 return er;
1072}
1073
1074static enum emulation_result kvm_vz_gpsi_cache(union mips_instruction inst,
1075 u32 *opc, u32 cause,
1076 struct kvm_vcpu *vcpu)
1077{
1078 enum emulation_result er = EMULATE_DONE;
1079 u32 cache, op_inst, op, base;
1080 s16 offset;
1081 struct kvm_vcpu_arch *arch = &vcpu->arch;
1082 unsigned long va, curr_pc;
1083
1084 /*
1085 * Update PC and hold onto current PC in case there is
1086 * an error and we want to rollback the PC
1087 */
1088 curr_pc = vcpu->arch.pc;
1089 er = update_pc(vcpu, cause);
1090 if (er == EMULATE_FAIL)
1091 return er;
1092
1093 base = inst.i_format.rs;
1094 op_inst = inst.i_format.rt;
1095 if (cpu_has_mips_r6)
1096 offset = inst.spec3_format.simmediate;
1097 else
1098 offset = inst.i_format.simmediate;
1099 cache = op_inst & CacheOp_Cache;
1100 op = op_inst & CacheOp_Op;
1101
1102 va = arch->gprs[base] + offset;
1103
1104 kvm_debug("CACHE (cache: %#x, op: %#x, base[%d]: %#lx, offset: %#x\n",
1105 cache, op, base, arch->gprs[base], offset);
1106
1107 /* Secondary or tirtiary cache ops ignored */
1108 if (cache != Cache_I && cache != Cache_D)
1109 return EMULATE_DONE;
1110
1111 switch (op_inst) {
1112 case Index_Invalidate_I:
1113 flush_icache_line_indexed(va);
1114 return EMULATE_DONE;
1115 case Index_Writeback_Inv_D:
1116 flush_dcache_line_indexed(va);
1117 return EMULATE_DONE;
1118 case Hit_Invalidate_I:
1119 case Hit_Invalidate_D:
1120 case Hit_Writeback_Inv_D:
1121 if (boot_cpu_type() == CPU_CAVIUM_OCTEON3) {
1122 /* We can just flush entire icache */
1123 local_flush_icache_range(0, 0);
1124 return EMULATE_DONE;
1125 }
1126
1127 /* So far, other platforms support guest hit cache ops */
1128 break;
1129 default:
1130 break;
1131 }
1132
1133 kvm_err("@ %#lx/%#lx CACHE (cache: %#x, op: %#x, base[%d]: %#lx, offset: %#x\n",
1134 curr_pc, vcpu->arch.gprs[31], cache, op, base, arch->gprs[base],
1135 offset);
1136 /* Rollback PC */
1137 vcpu->arch.pc = curr_pc;
1138
1139 return EMULATE_FAIL;
1140}
1141
1142#ifdef CONFIG_CPU_LOONGSON64
1143static enum emulation_result kvm_vz_gpsi_lwc2(union mips_instruction inst,
1144 u32 *opc, u32 cause,
1145 struct kvm_vcpu *vcpu)
1146{
1147 unsigned int rs, rd;
1148 unsigned int hostcfg;
1149 unsigned long curr_pc;
1150 enum emulation_result er = EMULATE_DONE;
1151
1152 /*
1153 * Update PC and hold onto current PC in case there is
1154 * an error and we want to rollback the PC
1155 */
1156 curr_pc = vcpu->arch.pc;
1157 er = update_pc(vcpu, cause);
1158 if (er == EMULATE_FAIL)
1159 return er;
1160
1161 rs = inst.loongson3_lscsr_format.rs;
1162 rd = inst.loongson3_lscsr_format.rd;
1163 switch (inst.loongson3_lscsr_format.fr) {
1164 case 0x8: /* Read CPUCFG */
1165 ++vcpu->stat.vz_cpucfg_exits;
1166 hostcfg = read_cpucfg(vcpu->arch.gprs[rs]);
1167
1168 switch (vcpu->arch.gprs[rs]) {
1169 case LOONGSON_CFG0:
1170 vcpu->arch.gprs[rd] = 0x14c000;
1171 break;
1172 case LOONGSON_CFG1:
1173 hostcfg &= (LOONGSON_CFG1_FP | LOONGSON_CFG1_MMI |
1174 LOONGSON_CFG1_MSA1 | LOONGSON_CFG1_MSA2 |
1175 LOONGSON_CFG1_SFBP);
1176 vcpu->arch.gprs[rd] = hostcfg;
1177 break;
1178 case LOONGSON_CFG2:
1179 hostcfg &= (LOONGSON_CFG2_LEXT1 | LOONGSON_CFG2_LEXT2 |
1180 LOONGSON_CFG2_LEXT3 | LOONGSON_CFG2_LSPW);
1181 vcpu->arch.gprs[rd] = hostcfg;
1182 break;
1183 case LOONGSON_CFG3:
1184 vcpu->arch.gprs[rd] = hostcfg;
1185 break;
1186 default:
1187 /* Don't export any other advanced features to guest */
1188 vcpu->arch.gprs[rd] = 0;
1189 break;
1190 }
1191 break;
1192
1193 default:
1194 kvm_err("lwc2 emulate not impl %d rs %lx @%lx\n",
1195 inst.loongson3_lscsr_format.fr, vcpu->arch.gprs[rs], curr_pc);
1196 er = EMULATE_FAIL;
1197 break;
1198 }
1199
1200 /* Rollback PC only if emulation was unsuccessful */
1201 if (er == EMULATE_FAIL) {
1202 kvm_err("[%#lx]%s: unsupported lwc2 instruction 0x%08x 0x%08x\n",
1203 curr_pc, __func__, inst.word, inst.loongson3_lscsr_format.fr);
1204
1205 vcpu->arch.pc = curr_pc;
1206 }
1207
1208 return er;
1209}
1210#endif
1211
1212static enum emulation_result kvm_trap_vz_handle_gpsi(u32 cause, u32 *opc,
1213 struct kvm_vcpu *vcpu)
1214{
1215 enum emulation_result er = EMULATE_DONE;
1216 struct kvm_vcpu_arch *arch = &vcpu->arch;
1217 union mips_instruction inst;
1218 int rd, rt, sel;
1219 int err;
1220
1221 /*
1222 * Fetch the instruction.
1223 */
1224 if (cause & CAUSEF_BD)
1225 opc += 1;
1226 err = kvm_get_badinstr(opc, vcpu, &inst.word);
1227 if (err)
1228 return EMULATE_FAIL;
1229
1230 switch (inst.r_format.opcode) {
1231 case cop0_op:
1232 er = kvm_vz_gpsi_cop0(inst, opc, cause, vcpu);
1233 break;
1234#ifndef CONFIG_CPU_MIPSR6
1235 case cache_op:
1236 trace_kvm_exit(vcpu, KVM_TRACE_EXIT_CACHE);
1237 er = kvm_vz_gpsi_cache(inst, opc, cause, vcpu);
1238 break;
1239#endif
1240#ifdef CONFIG_CPU_LOONGSON64
1241 case lwc2_op:
1242 er = kvm_vz_gpsi_lwc2(inst, opc, cause, vcpu);
1243 break;
1244#endif
1245 case spec3_op:
1246 switch (inst.spec3_format.func) {
1247#ifdef CONFIG_CPU_MIPSR6
1248 case cache6_op:
1249 trace_kvm_exit(vcpu, KVM_TRACE_EXIT_CACHE);
1250 er = kvm_vz_gpsi_cache(inst, opc, cause, vcpu);
1251 break;
1252#endif
1253 case rdhwr_op:
1254 if (inst.r_format.rs || (inst.r_format.re >> 3))
1255 goto unknown;
1256
1257 rd = inst.r_format.rd;
1258 rt = inst.r_format.rt;
1259 sel = inst.r_format.re & 0x7;
1260
1261 switch (rd) {
1262 case MIPS_HWR_CC: /* Read count register */
1263 arch->gprs[rt] =
1264 (long)(int)kvm_mips_read_count(vcpu);
1265 break;
1266 default:
1267 trace_kvm_hwr(vcpu, KVM_TRACE_RDHWR,
1268 KVM_TRACE_HWR(rd, sel), 0);
1269 goto unknown;
1270 }
1271
1272 trace_kvm_hwr(vcpu, KVM_TRACE_RDHWR,
1273 KVM_TRACE_HWR(rd, sel), arch->gprs[rt]);
1274
1275 er = update_pc(vcpu, cause);
1276 break;
1277 default:
1278 goto unknown;
1279 }
1280 break;
1281unknown:
1282
1283 default:
1284 kvm_err("GPSI exception not supported (%p/%#x)\n",
1285 opc, inst.word);
1286 kvm_arch_vcpu_dump_regs(vcpu);
1287 er = EMULATE_FAIL;
1288 break;
1289 }
1290
1291 return er;
1292}
1293
1294static enum emulation_result kvm_trap_vz_handle_gsfc(u32 cause, u32 *opc,
1295 struct kvm_vcpu *vcpu)
1296{
1297 enum emulation_result er = EMULATE_DONE;
1298 struct kvm_vcpu_arch *arch = &vcpu->arch;
1299 union mips_instruction inst;
1300 int err;
1301
1302 /*
1303 * Fetch the instruction.
1304 */
1305 if (cause & CAUSEF_BD)
1306 opc += 1;
1307 err = kvm_get_badinstr(opc, vcpu, &inst.word);
1308 if (err)
1309 return EMULATE_FAIL;
1310
1311 /* complete MTC0 on behalf of guest and advance EPC */
1312 if (inst.c0r_format.opcode == cop0_op &&
1313 inst.c0r_format.rs == mtc_op &&
1314 inst.c0r_format.z == 0) {
1315 int rt = inst.c0r_format.rt;
1316 int rd = inst.c0r_format.rd;
1317 int sel = inst.c0r_format.sel;
1318 unsigned int val = arch->gprs[rt];
1319 unsigned int old_val, change;
1320
1321 trace_kvm_hwr(vcpu, KVM_TRACE_MTC0, KVM_TRACE_COP0(rd, sel),
1322 val);
1323
1324 if ((rd == MIPS_CP0_STATUS) && (sel == 0)) {
1325 /* FR bit should read as zero if no FPU */
1326 if (!kvm_mips_guest_has_fpu(&vcpu->arch))
1327 val &= ~(ST0_CU1 | ST0_FR);
1328
1329 /*
1330 * Also don't allow FR to be set if host doesn't support
1331 * it.
1332 */
1333 if (!(boot_cpu_data.fpu_id & MIPS_FPIR_F64))
1334 val &= ~ST0_FR;
1335
1336 old_val = read_gc0_status();
1337 change = val ^ old_val;
1338
1339 if (change & ST0_FR) {
1340 /*
1341 * FPU and Vector register state is made
1342 * UNPREDICTABLE by a change of FR, so don't
1343 * even bother saving it.
1344 */
1345 kvm_drop_fpu(vcpu);
1346 }
1347
1348 /*
1349 * If MSA state is already live, it is undefined how it
1350 * interacts with FR=0 FPU state, and we don't want to
1351 * hit reserved instruction exceptions trying to save
1352 * the MSA state later when CU=1 && FR=1, so play it
1353 * safe and save it first.
1354 */
1355 if (change & ST0_CU1 && !(val & ST0_FR) &&
1356 vcpu->arch.aux_inuse & KVM_MIPS_AUX_MSA)
1357 kvm_lose_fpu(vcpu);
1358
1359 write_gc0_status(val);
1360 } else if ((rd == MIPS_CP0_CAUSE) && (sel == 0)) {
1361 u32 old_cause = read_gc0_cause();
1362 u32 change = old_cause ^ val;
1363
1364 /* DC bit enabling/disabling timer? */
1365 if (change & CAUSEF_DC) {
1366 if (val & CAUSEF_DC) {
1367 kvm_vz_lose_htimer(vcpu);
1368 kvm_mips_count_disable_cause(vcpu);
1369 } else {
1370 kvm_mips_count_enable_cause(vcpu);
1371 }
1372 }
1373
1374 /* Only certain bits are RW to the guest */
1375 change &= (CAUSEF_DC | CAUSEF_IV | CAUSEF_WP |
1376 CAUSEF_IP0 | CAUSEF_IP1);
1377
1378 /* WP can only be cleared */
1379 change &= ~CAUSEF_WP | old_cause;
1380
1381 write_gc0_cause(old_cause ^ change);
1382 } else if ((rd == MIPS_CP0_STATUS) && (sel == 1)) { /* IntCtl */
1383 write_gc0_intctl(val);
1384 } else if ((rd == MIPS_CP0_CONFIG) && (sel == 5)) {
1385 old_val = read_gc0_config5();
1386 change = val ^ old_val;
1387 /* Handle changes in FPU/MSA modes */
1388 preempt_disable();
1389
1390 /*
1391 * Propagate FRE changes immediately if the FPU
1392 * context is already loaded.
1393 */
1394 if (change & MIPS_CONF5_FRE &&
1395 vcpu->arch.aux_inuse & KVM_MIPS_AUX_FPU)
1396 change_c0_config5(MIPS_CONF5_FRE, val);
1397
1398 preempt_enable();
1399
1400 val = old_val ^
1401 (change & kvm_vz_config5_guest_wrmask(vcpu));
1402 write_gc0_config5(val);
1403 } else {
1404 kvm_err("Handle GSFC, unsupported field change @ %p: %#x\n",
1405 opc, inst.word);
1406 er = EMULATE_FAIL;
1407 }
1408
1409 if (er != EMULATE_FAIL)
1410 er = update_pc(vcpu, cause);
1411 } else {
1412 kvm_err("Handle GSFC, unrecognized instruction @ %p: %#x\n",
1413 opc, inst.word);
1414 er = EMULATE_FAIL;
1415 }
1416
1417 return er;
1418}
1419
1420static enum emulation_result kvm_trap_vz_handle_ghfc(u32 cause, u32 *opc,
1421 struct kvm_vcpu *vcpu)
1422{
1423 /*
1424 * Presumably this is due to MC (guest mode change), so lets trace some
1425 * relevant info.
1426 */
1427 trace_kvm_guest_mode_change(vcpu);
1428
1429 return EMULATE_DONE;
1430}
1431
1432static enum emulation_result kvm_trap_vz_handle_hc(u32 cause, u32 *opc,
1433 struct kvm_vcpu *vcpu)
1434{
1435 enum emulation_result er;
1436 union mips_instruction inst;
1437 unsigned long curr_pc;
1438 int err;
1439
1440 if (cause & CAUSEF_BD)
1441 opc += 1;
1442 err = kvm_get_badinstr(opc, vcpu, &inst.word);
1443 if (err)
1444 return EMULATE_FAIL;
1445
1446 /*
1447 * Update PC and hold onto current PC in case there is
1448 * an error and we want to rollback the PC
1449 */
1450 curr_pc = vcpu->arch.pc;
1451 er = update_pc(vcpu, cause);
1452 if (er == EMULATE_FAIL)
1453 return er;
1454
1455 er = kvm_mips_emul_hypcall(vcpu, inst);
1456 if (er == EMULATE_FAIL)
1457 vcpu->arch.pc = curr_pc;
1458
1459 return er;
1460}
1461
1462static enum emulation_result kvm_trap_vz_no_handler_guest_exit(u32 gexccode,
1463 u32 cause,
1464 u32 *opc,
1465 struct kvm_vcpu *vcpu)
1466{
1467 u32 inst;
1468
1469 /*
1470 * Fetch the instruction.
1471 */
1472 if (cause & CAUSEF_BD)
1473 opc += 1;
1474 kvm_get_badinstr(opc, vcpu, &inst);
1475
1476 kvm_err("Guest Exception Code: %d not yet handled @ PC: %p, inst: 0x%08x Status: %#x\n",
1477 gexccode, opc, inst, read_gc0_status());
1478
1479 return EMULATE_FAIL;
1480}
1481
1482static int kvm_trap_vz_handle_guest_exit(struct kvm_vcpu *vcpu)
1483{
1484 u32 *opc = (u32 *) vcpu->arch.pc;
1485 u32 cause = vcpu->arch.host_cp0_cause;
1486 enum emulation_result er = EMULATE_DONE;
1487 u32 gexccode = (vcpu->arch.host_cp0_guestctl0 &
1488 MIPS_GCTL0_GEXC) >> MIPS_GCTL0_GEXC_SHIFT;
1489 int ret = RESUME_GUEST;
1490
1491 trace_kvm_exit(vcpu, KVM_TRACE_EXIT_GEXCCODE_BASE + gexccode);
1492 switch (gexccode) {
1493 case MIPS_GCTL0_GEXC_GPSI:
1494 ++vcpu->stat.vz_gpsi_exits;
1495 er = kvm_trap_vz_handle_gpsi(cause, opc, vcpu);
1496 break;
1497 case MIPS_GCTL0_GEXC_GSFC:
1498 ++vcpu->stat.vz_gsfc_exits;
1499 er = kvm_trap_vz_handle_gsfc(cause, opc, vcpu);
1500 break;
1501 case MIPS_GCTL0_GEXC_HC:
1502 ++vcpu->stat.vz_hc_exits;
1503 er = kvm_trap_vz_handle_hc(cause, opc, vcpu);
1504 break;
1505 case MIPS_GCTL0_GEXC_GRR:
1506 ++vcpu->stat.vz_grr_exits;
1507 er = kvm_trap_vz_no_handler_guest_exit(gexccode, cause, opc,
1508 vcpu);
1509 break;
1510 case MIPS_GCTL0_GEXC_GVA:
1511 ++vcpu->stat.vz_gva_exits;
1512 er = kvm_trap_vz_no_handler_guest_exit(gexccode, cause, opc,
1513 vcpu);
1514 break;
1515 case MIPS_GCTL0_GEXC_GHFC:
1516 ++vcpu->stat.vz_ghfc_exits;
1517 er = kvm_trap_vz_handle_ghfc(cause, opc, vcpu);
1518 break;
1519 case MIPS_GCTL0_GEXC_GPA:
1520 ++vcpu->stat.vz_gpa_exits;
1521 er = kvm_trap_vz_no_handler_guest_exit(gexccode, cause, opc,
1522 vcpu);
1523 break;
1524 default:
1525 ++vcpu->stat.vz_resvd_exits;
1526 er = kvm_trap_vz_no_handler_guest_exit(gexccode, cause, opc,
1527 vcpu);
1528 break;
1529
1530 }
1531
1532 if (er == EMULATE_DONE) {
1533 ret = RESUME_GUEST;
1534 } else if (er == EMULATE_HYPERCALL) {
1535 ret = kvm_mips_handle_hypcall(vcpu);
1536 } else {
1537 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1538 ret = RESUME_HOST;
1539 }
1540 return ret;
1541}
1542
1543/**
1544 * kvm_trap_vz_handle_cop_unusable() - Guest used unusable coprocessor.
1545 * @vcpu: Virtual CPU context.
1546 *
1547 * Handle when the guest attempts to use a coprocessor which hasn't been allowed
1548 * by the root context.
1549 *
1550 * Return: value indicating whether to resume the host or the guest
1551 * (RESUME_HOST or RESUME_GUEST)
1552 */
1553static int kvm_trap_vz_handle_cop_unusable(struct kvm_vcpu *vcpu)
1554{
1555 u32 cause = vcpu->arch.host_cp0_cause;
1556 enum emulation_result er = EMULATE_FAIL;
1557 int ret = RESUME_GUEST;
1558
1559 if (((cause & CAUSEF_CE) >> CAUSEB_CE) == 1) {
1560 /*
1561 * If guest FPU not present, the FPU operation should have been
1562 * treated as a reserved instruction!
1563 * If FPU already in use, we shouldn't get this at all.
1564 */
1565 if (WARN_ON(!kvm_mips_guest_has_fpu(&vcpu->arch) ||
1566 vcpu->arch.aux_inuse & KVM_MIPS_AUX_FPU)) {
1567 preempt_enable();
1568 return EMULATE_FAIL;
1569 }
1570
1571 kvm_own_fpu(vcpu);
1572 er = EMULATE_DONE;
1573 }
1574 /* other coprocessors not handled */
1575
1576 switch (er) {
1577 case EMULATE_DONE:
1578 ret = RESUME_GUEST;
1579 break;
1580
1581 case EMULATE_FAIL:
1582 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1583 ret = RESUME_HOST;
1584 break;
1585
1586 default:
1587 BUG();
1588 }
1589 return ret;
1590}
1591
1592/**
1593 * kvm_trap_vz_handle_msa_disabled() - Guest used MSA while disabled in root.
1594 * @vcpu: Virtual CPU context.
1595 *
1596 * Handle when the guest attempts to use MSA when it is disabled in the root
1597 * context.
1598 *
1599 * Return: value indicating whether to resume the host or the guest
1600 * (RESUME_HOST or RESUME_GUEST)
1601 */
1602static int kvm_trap_vz_handle_msa_disabled(struct kvm_vcpu *vcpu)
1603{
1604 /*
1605 * If MSA not present or not exposed to guest or FR=0, the MSA operation
1606 * should have been treated as a reserved instruction!
1607 * Same if CU1=1, FR=0.
1608 * If MSA already in use, we shouldn't get this at all.
1609 */
1610 if (!kvm_mips_guest_has_msa(&vcpu->arch) ||
1611 (read_gc0_status() & (ST0_CU1 | ST0_FR)) == ST0_CU1 ||
1612 !(read_gc0_config5() & MIPS_CONF5_MSAEN) ||
1613 vcpu->arch.aux_inuse & KVM_MIPS_AUX_MSA) {
1614 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1615 return RESUME_HOST;
1616 }
1617
1618 kvm_own_msa(vcpu);
1619
1620 return RESUME_GUEST;
1621}
1622
1623static int kvm_trap_vz_handle_tlb_ld_miss(struct kvm_vcpu *vcpu)
1624{
1625 struct kvm_run *run = vcpu->run;
1626 u32 *opc = (u32 *) vcpu->arch.pc;
1627 u32 cause = vcpu->arch.host_cp0_cause;
1628 ulong badvaddr = vcpu->arch.host_cp0_badvaddr;
1629 union mips_instruction inst;
1630 enum emulation_result er = EMULATE_DONE;
1631 int err, ret = RESUME_GUEST;
1632
1633 if (kvm_mips_handle_vz_root_tlb_fault(badvaddr, vcpu, false)) {
1634 /* A code fetch fault doesn't count as an MMIO */
1635 if (kvm_is_ifetch_fault(&vcpu->arch)) {
1636 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1637 return RESUME_HOST;
1638 }
1639
1640 /* Fetch the instruction */
1641 if (cause & CAUSEF_BD)
1642 opc += 1;
1643 err = kvm_get_badinstr(opc, vcpu, &inst.word);
1644 if (err) {
1645 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1646 return RESUME_HOST;
1647 }
1648
1649 /* Treat as MMIO */
1650 er = kvm_mips_emulate_load(inst, cause, vcpu);
1651 if (er == EMULATE_FAIL) {
1652 kvm_err("Guest Emulate Load from MMIO space failed: PC: %p, BadVaddr: %#lx\n",
1653 opc, badvaddr);
1654 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1655 }
1656 }
1657
1658 if (er == EMULATE_DONE) {
1659 ret = RESUME_GUEST;
1660 } else if (er == EMULATE_DO_MMIO) {
1661 run->exit_reason = KVM_EXIT_MMIO;
1662 ret = RESUME_HOST;
1663 } else {
1664 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1665 ret = RESUME_HOST;
1666 }
1667 return ret;
1668}
1669
1670static int kvm_trap_vz_handle_tlb_st_miss(struct kvm_vcpu *vcpu)
1671{
1672 struct kvm_run *run = vcpu->run;
1673 u32 *opc = (u32 *) vcpu->arch.pc;
1674 u32 cause = vcpu->arch.host_cp0_cause;
1675 ulong badvaddr = vcpu->arch.host_cp0_badvaddr;
1676 union mips_instruction inst;
1677 enum emulation_result er = EMULATE_DONE;
1678 int err;
1679 int ret = RESUME_GUEST;
1680
1681 /* Just try the access again if we couldn't do the translation */
1682 if (kvm_vz_badvaddr_to_gpa(vcpu, badvaddr, &badvaddr))
1683 return RESUME_GUEST;
1684 vcpu->arch.host_cp0_badvaddr = badvaddr;
1685
1686 if (kvm_mips_handle_vz_root_tlb_fault(badvaddr, vcpu, true)) {
1687 /* Fetch the instruction */
1688 if (cause & CAUSEF_BD)
1689 opc += 1;
1690 err = kvm_get_badinstr(opc, vcpu, &inst.word);
1691 if (err) {
1692 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1693 return RESUME_HOST;
1694 }
1695
1696 /* Treat as MMIO */
1697 er = kvm_mips_emulate_store(inst, cause, vcpu);
1698 if (er == EMULATE_FAIL) {
1699 kvm_err("Guest Emulate Store to MMIO space failed: PC: %p, BadVaddr: %#lx\n",
1700 opc, badvaddr);
1701 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1702 }
1703 }
1704
1705 if (er == EMULATE_DONE) {
1706 ret = RESUME_GUEST;
1707 } else if (er == EMULATE_DO_MMIO) {
1708 run->exit_reason = KVM_EXIT_MMIO;
1709 ret = RESUME_HOST;
1710 } else {
1711 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1712 ret = RESUME_HOST;
1713 }
1714 return ret;
1715}
1716
1717static u64 kvm_vz_get_one_regs[] = {
1718 KVM_REG_MIPS_CP0_INDEX,
1719 KVM_REG_MIPS_CP0_ENTRYLO0,
1720 KVM_REG_MIPS_CP0_ENTRYLO1,
1721 KVM_REG_MIPS_CP0_CONTEXT,
1722 KVM_REG_MIPS_CP0_PAGEMASK,
1723 KVM_REG_MIPS_CP0_PAGEGRAIN,
1724 KVM_REG_MIPS_CP0_WIRED,
1725 KVM_REG_MIPS_CP0_HWRENA,
1726 KVM_REG_MIPS_CP0_BADVADDR,
1727 KVM_REG_MIPS_CP0_COUNT,
1728 KVM_REG_MIPS_CP0_ENTRYHI,
1729 KVM_REG_MIPS_CP0_COMPARE,
1730 KVM_REG_MIPS_CP0_STATUS,
1731 KVM_REG_MIPS_CP0_INTCTL,
1732 KVM_REG_MIPS_CP0_CAUSE,
1733 KVM_REG_MIPS_CP0_EPC,
1734 KVM_REG_MIPS_CP0_PRID,
1735 KVM_REG_MIPS_CP0_EBASE,
1736 KVM_REG_MIPS_CP0_CONFIG,
1737 KVM_REG_MIPS_CP0_CONFIG1,
1738 KVM_REG_MIPS_CP0_CONFIG2,
1739 KVM_REG_MIPS_CP0_CONFIG3,
1740 KVM_REG_MIPS_CP0_CONFIG4,
1741 KVM_REG_MIPS_CP0_CONFIG5,
1742 KVM_REG_MIPS_CP0_CONFIG6,
1743#ifdef CONFIG_64BIT
1744 KVM_REG_MIPS_CP0_XCONTEXT,
1745#endif
1746 KVM_REG_MIPS_CP0_ERROREPC,
1747
1748 KVM_REG_MIPS_COUNT_CTL,
1749 KVM_REG_MIPS_COUNT_RESUME,
1750 KVM_REG_MIPS_COUNT_HZ,
1751};
1752
1753static u64 kvm_vz_get_one_regs_contextconfig[] = {
1754 KVM_REG_MIPS_CP0_CONTEXTCONFIG,
1755#ifdef CONFIG_64BIT
1756 KVM_REG_MIPS_CP0_XCONTEXTCONFIG,
1757#endif
1758};
1759
1760static u64 kvm_vz_get_one_regs_segments[] = {
1761 KVM_REG_MIPS_CP0_SEGCTL0,
1762 KVM_REG_MIPS_CP0_SEGCTL1,
1763 KVM_REG_MIPS_CP0_SEGCTL2,
1764};
1765
1766static u64 kvm_vz_get_one_regs_htw[] = {
1767 KVM_REG_MIPS_CP0_PWBASE,
1768 KVM_REG_MIPS_CP0_PWFIELD,
1769 KVM_REG_MIPS_CP0_PWSIZE,
1770 KVM_REG_MIPS_CP0_PWCTL,
1771};
1772
1773static u64 kvm_vz_get_one_regs_kscratch[] = {
1774 KVM_REG_MIPS_CP0_KSCRATCH1,
1775 KVM_REG_MIPS_CP0_KSCRATCH2,
1776 KVM_REG_MIPS_CP0_KSCRATCH3,
1777 KVM_REG_MIPS_CP0_KSCRATCH4,
1778 KVM_REG_MIPS_CP0_KSCRATCH5,
1779 KVM_REG_MIPS_CP0_KSCRATCH6,
1780};
1781
1782static unsigned long kvm_vz_num_regs(struct kvm_vcpu *vcpu)
1783{
1784 unsigned long ret;
1785
1786 ret = ARRAY_SIZE(kvm_vz_get_one_regs);
1787 if (cpu_guest_has_userlocal)
1788 ++ret;
1789 if (cpu_guest_has_badinstr)
1790 ++ret;
1791 if (cpu_guest_has_badinstrp)
1792 ++ret;
1793 if (cpu_guest_has_contextconfig)
1794 ret += ARRAY_SIZE(kvm_vz_get_one_regs_contextconfig);
1795 if (cpu_guest_has_segments)
1796 ret += ARRAY_SIZE(kvm_vz_get_one_regs_segments);
1797 if (cpu_guest_has_htw || cpu_guest_has_ldpte)
1798 ret += ARRAY_SIZE(kvm_vz_get_one_regs_htw);
1799 if (cpu_guest_has_maar && !cpu_guest_has_dyn_maar)
1800 ret += 1 + ARRAY_SIZE(vcpu->arch.maar);
1801 ret += __arch_hweight8(cpu_data[0].guest.kscratch_mask);
1802
1803 return ret;
1804}
1805
1806static int kvm_vz_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices)
1807{
1808 u64 index;
1809 unsigned int i;
1810
1811 if (copy_to_user(indices, kvm_vz_get_one_regs,
1812 sizeof(kvm_vz_get_one_regs)))
1813 return -EFAULT;
1814 indices += ARRAY_SIZE(kvm_vz_get_one_regs);
1815
1816 if (cpu_guest_has_userlocal) {
1817 index = KVM_REG_MIPS_CP0_USERLOCAL;
1818 if (copy_to_user(indices, &index, sizeof(index)))
1819 return -EFAULT;
1820 ++indices;
1821 }
1822 if (cpu_guest_has_badinstr) {
1823 index = KVM_REG_MIPS_CP0_BADINSTR;
1824 if (copy_to_user(indices, &index, sizeof(index)))
1825 return -EFAULT;
1826 ++indices;
1827 }
1828 if (cpu_guest_has_badinstrp) {
1829 index = KVM_REG_MIPS_CP0_BADINSTRP;
1830 if (copy_to_user(indices, &index, sizeof(index)))
1831 return -EFAULT;
1832 ++indices;
1833 }
1834 if (cpu_guest_has_contextconfig) {
1835 if (copy_to_user(indices, kvm_vz_get_one_regs_contextconfig,
1836 sizeof(kvm_vz_get_one_regs_contextconfig)))
1837 return -EFAULT;
1838 indices += ARRAY_SIZE(kvm_vz_get_one_regs_contextconfig);
1839 }
1840 if (cpu_guest_has_segments) {
1841 if (copy_to_user(indices, kvm_vz_get_one_regs_segments,
1842 sizeof(kvm_vz_get_one_regs_segments)))
1843 return -EFAULT;
1844 indices += ARRAY_SIZE(kvm_vz_get_one_regs_segments);
1845 }
1846 if (cpu_guest_has_htw || cpu_guest_has_ldpte) {
1847 if (copy_to_user(indices, kvm_vz_get_one_regs_htw,
1848 sizeof(kvm_vz_get_one_regs_htw)))
1849 return -EFAULT;
1850 indices += ARRAY_SIZE(kvm_vz_get_one_regs_htw);
1851 }
1852 if (cpu_guest_has_maar && !cpu_guest_has_dyn_maar) {
1853 for (i = 0; i < ARRAY_SIZE(vcpu->arch.maar); ++i) {
1854 index = KVM_REG_MIPS_CP0_MAAR(i);
1855 if (copy_to_user(indices, &index, sizeof(index)))
1856 return -EFAULT;
1857 ++indices;
1858 }
1859
1860 index = KVM_REG_MIPS_CP0_MAARI;
1861 if (copy_to_user(indices, &index, sizeof(index)))
1862 return -EFAULT;
1863 ++indices;
1864 }
1865 for (i = 0; i < 6; ++i) {
1866 if (!cpu_guest_has_kscr(i + 2))
1867 continue;
1868
1869 if (copy_to_user(indices, &kvm_vz_get_one_regs_kscratch[i],
1870 sizeof(kvm_vz_get_one_regs_kscratch[i])))
1871 return -EFAULT;
1872 ++indices;
1873 }
1874
1875 return 0;
1876}
1877
1878static inline s64 entrylo_kvm_to_user(unsigned long v)
1879{
1880 s64 mask, ret = v;
1881
1882 if (BITS_PER_LONG == 32) {
1883 /*
1884 * KVM API exposes 64-bit version of the register, so move the
1885 * RI/XI bits up into place.
1886 */
1887 mask = MIPS_ENTRYLO_RI | MIPS_ENTRYLO_XI;
1888 ret &= ~mask;
1889 ret |= ((s64)v & mask) << 32;
1890 }
1891 return ret;
1892}
1893
1894static inline unsigned long entrylo_user_to_kvm(s64 v)
1895{
1896 unsigned long mask, ret = v;
1897
1898 if (BITS_PER_LONG == 32) {
1899 /*
1900 * KVM API exposes 64-bit versiono of the register, so move the
1901 * RI/XI bits down into place.
1902 */
1903 mask = MIPS_ENTRYLO_RI | MIPS_ENTRYLO_XI;
1904 ret &= ~mask;
1905 ret |= (v >> 32) & mask;
1906 }
1907 return ret;
1908}
1909
1910static int kvm_vz_get_one_reg(struct kvm_vcpu *vcpu,
1911 const struct kvm_one_reg *reg,
1912 s64 *v)
1913{
1914 struct mips_coproc *cop0 = vcpu->arch.cop0;
1915 unsigned int idx;
1916
1917 switch (reg->id) {
1918 case KVM_REG_MIPS_CP0_INDEX:
1919 *v = (long)read_gc0_index();
1920 break;
1921 case KVM_REG_MIPS_CP0_ENTRYLO0:
1922 *v = entrylo_kvm_to_user(read_gc0_entrylo0());
1923 break;
1924 case KVM_REG_MIPS_CP0_ENTRYLO1:
1925 *v = entrylo_kvm_to_user(read_gc0_entrylo1());
1926 break;
1927 case KVM_REG_MIPS_CP0_CONTEXT:
1928 *v = (long)read_gc0_context();
1929 break;
1930 case KVM_REG_MIPS_CP0_CONTEXTCONFIG:
1931 if (!cpu_guest_has_contextconfig)
1932 return -EINVAL;
1933 *v = read_gc0_contextconfig();
1934 break;
1935 case KVM_REG_MIPS_CP0_USERLOCAL:
1936 if (!cpu_guest_has_userlocal)
1937 return -EINVAL;
1938 *v = read_gc0_userlocal();
1939 break;
1940#ifdef CONFIG_64BIT
1941 case KVM_REG_MIPS_CP0_XCONTEXTCONFIG:
1942 if (!cpu_guest_has_contextconfig)
1943 return -EINVAL;
1944 *v = read_gc0_xcontextconfig();
1945 break;
1946#endif
1947 case KVM_REG_MIPS_CP0_PAGEMASK:
1948 *v = (long)read_gc0_pagemask();
1949 break;
1950 case KVM_REG_MIPS_CP0_PAGEGRAIN:
1951 *v = (long)read_gc0_pagegrain();
1952 break;
1953 case KVM_REG_MIPS_CP0_SEGCTL0:
1954 if (!cpu_guest_has_segments)
1955 return -EINVAL;
1956 *v = read_gc0_segctl0();
1957 break;
1958 case KVM_REG_MIPS_CP0_SEGCTL1:
1959 if (!cpu_guest_has_segments)
1960 return -EINVAL;
1961 *v = read_gc0_segctl1();
1962 break;
1963 case KVM_REG_MIPS_CP0_SEGCTL2:
1964 if (!cpu_guest_has_segments)
1965 return -EINVAL;
1966 *v = read_gc0_segctl2();
1967 break;
1968 case KVM_REG_MIPS_CP0_PWBASE:
1969 if (!cpu_guest_has_htw && !cpu_guest_has_ldpte)
1970 return -EINVAL;
1971 *v = read_gc0_pwbase();
1972 break;
1973 case KVM_REG_MIPS_CP0_PWFIELD:
1974 if (!cpu_guest_has_htw && !cpu_guest_has_ldpte)
1975 return -EINVAL;
1976 *v = read_gc0_pwfield();
1977 break;
1978 case KVM_REG_MIPS_CP0_PWSIZE:
1979 if (!cpu_guest_has_htw && !cpu_guest_has_ldpte)
1980 return -EINVAL;
1981 *v = read_gc0_pwsize();
1982 break;
1983 case KVM_REG_MIPS_CP0_WIRED:
1984 *v = (long)read_gc0_wired();
1985 break;
1986 case KVM_REG_MIPS_CP0_PWCTL:
1987 if (!cpu_guest_has_htw && !cpu_guest_has_ldpte)
1988 return -EINVAL;
1989 *v = read_gc0_pwctl();
1990 break;
1991 case KVM_REG_MIPS_CP0_HWRENA:
1992 *v = (long)read_gc0_hwrena();
1993 break;
1994 case KVM_REG_MIPS_CP0_BADVADDR:
1995 *v = (long)read_gc0_badvaddr();
1996 break;
1997 case KVM_REG_MIPS_CP0_BADINSTR:
1998 if (!cpu_guest_has_badinstr)
1999 return -EINVAL;
2000 *v = read_gc0_badinstr();
2001 break;
2002 case KVM_REG_MIPS_CP0_BADINSTRP:
2003 if (!cpu_guest_has_badinstrp)
2004 return -EINVAL;
2005 *v = read_gc0_badinstrp();
2006 break;
2007 case KVM_REG_MIPS_CP0_COUNT:
2008 *v = kvm_mips_read_count(vcpu);
2009 break;
2010 case KVM_REG_MIPS_CP0_ENTRYHI:
2011 *v = (long)read_gc0_entryhi();
2012 break;
2013 case KVM_REG_MIPS_CP0_COMPARE:
2014 *v = (long)read_gc0_compare();
2015 break;
2016 case KVM_REG_MIPS_CP0_STATUS:
2017 *v = (long)read_gc0_status();
2018 break;
2019 case KVM_REG_MIPS_CP0_INTCTL:
2020 *v = read_gc0_intctl();
2021 break;
2022 case KVM_REG_MIPS_CP0_CAUSE:
2023 *v = (long)read_gc0_cause();
2024 break;
2025 case KVM_REG_MIPS_CP0_EPC:
2026 *v = (long)read_gc0_epc();
2027 break;
2028 case KVM_REG_MIPS_CP0_PRID:
2029 switch (boot_cpu_type()) {
2030 case CPU_CAVIUM_OCTEON3:
2031 /* Octeon III has a read-only guest.PRid */
2032 *v = read_gc0_prid();
2033 break;
2034 default:
2035 *v = (long)kvm_read_c0_guest_prid(cop0);
2036 break;
2037 }
2038 break;
2039 case KVM_REG_MIPS_CP0_EBASE:
2040 *v = kvm_vz_read_gc0_ebase();
2041 break;
2042 case KVM_REG_MIPS_CP0_CONFIG:
2043 *v = read_gc0_config();
2044 break;
2045 case KVM_REG_MIPS_CP0_CONFIG1:
2046 if (!cpu_guest_has_conf1)
2047 return -EINVAL;
2048 *v = read_gc0_config1();
2049 break;
2050 case KVM_REG_MIPS_CP0_CONFIG2:
2051 if (!cpu_guest_has_conf2)
2052 return -EINVAL;
2053 *v = read_gc0_config2();
2054 break;
2055 case KVM_REG_MIPS_CP0_CONFIG3:
2056 if (!cpu_guest_has_conf3)
2057 return -EINVAL;
2058 *v = read_gc0_config3();
2059 break;
2060 case KVM_REG_MIPS_CP0_CONFIG4:
2061 if (!cpu_guest_has_conf4)
2062 return -EINVAL;
2063 *v = read_gc0_config4();
2064 break;
2065 case KVM_REG_MIPS_CP0_CONFIG5:
2066 if (!cpu_guest_has_conf5)
2067 return -EINVAL;
2068 *v = read_gc0_config5();
2069 break;
2070 case KVM_REG_MIPS_CP0_CONFIG6:
2071 *v = kvm_read_sw_gc0_config6(cop0);
2072 break;
2073 case KVM_REG_MIPS_CP0_MAAR(0) ... KVM_REG_MIPS_CP0_MAAR(0x3f):
2074 if (!cpu_guest_has_maar || cpu_guest_has_dyn_maar)
2075 return -EINVAL;
2076 idx = reg->id - KVM_REG_MIPS_CP0_MAAR(0);
2077 if (idx >= ARRAY_SIZE(vcpu->arch.maar))
2078 return -EINVAL;
2079 *v = vcpu->arch.maar[idx];
2080 break;
2081 case KVM_REG_MIPS_CP0_MAARI:
2082 if (!cpu_guest_has_maar || cpu_guest_has_dyn_maar)
2083 return -EINVAL;
2084 *v = kvm_read_sw_gc0_maari(vcpu->arch.cop0);
2085 break;
2086#ifdef CONFIG_64BIT
2087 case KVM_REG_MIPS_CP0_XCONTEXT:
2088 *v = read_gc0_xcontext();
2089 break;
2090#endif
2091 case KVM_REG_MIPS_CP0_ERROREPC:
2092 *v = (long)read_gc0_errorepc();
2093 break;
2094 case KVM_REG_MIPS_CP0_KSCRATCH1 ... KVM_REG_MIPS_CP0_KSCRATCH6:
2095 idx = reg->id - KVM_REG_MIPS_CP0_KSCRATCH1 + 2;
2096 if (!cpu_guest_has_kscr(idx))
2097 return -EINVAL;
2098 switch (idx) {
2099 case 2:
2100 *v = (long)read_gc0_kscratch1();
2101 break;
2102 case 3:
2103 *v = (long)read_gc0_kscratch2();
2104 break;
2105 case 4:
2106 *v = (long)read_gc0_kscratch3();
2107 break;
2108 case 5:
2109 *v = (long)read_gc0_kscratch4();
2110 break;
2111 case 6:
2112 *v = (long)read_gc0_kscratch5();
2113 break;
2114 case 7:
2115 *v = (long)read_gc0_kscratch6();
2116 break;
2117 }
2118 break;
2119 case KVM_REG_MIPS_COUNT_CTL:
2120 *v = vcpu->arch.count_ctl;
2121 break;
2122 case KVM_REG_MIPS_COUNT_RESUME:
2123 *v = ktime_to_ns(vcpu->arch.count_resume);
2124 break;
2125 case KVM_REG_MIPS_COUNT_HZ:
2126 *v = vcpu->arch.count_hz;
2127 break;
2128 default:
2129 return -EINVAL;
2130 }
2131 return 0;
2132}
2133
2134static int kvm_vz_set_one_reg(struct kvm_vcpu *vcpu,
2135 const struct kvm_one_reg *reg,
2136 s64 v)
2137{
2138 struct mips_coproc *cop0 = vcpu->arch.cop0;
2139 unsigned int idx;
2140 int ret = 0;
2141 unsigned int cur, change;
2142
2143 switch (reg->id) {
2144 case KVM_REG_MIPS_CP0_INDEX:
2145 write_gc0_index(v);
2146 break;
2147 case KVM_REG_MIPS_CP0_ENTRYLO0:
2148 write_gc0_entrylo0(entrylo_user_to_kvm(v));
2149 break;
2150 case KVM_REG_MIPS_CP0_ENTRYLO1:
2151 write_gc0_entrylo1(entrylo_user_to_kvm(v));
2152 break;
2153 case KVM_REG_MIPS_CP0_CONTEXT:
2154 write_gc0_context(v);
2155 break;
2156 case KVM_REG_MIPS_CP0_CONTEXTCONFIG:
2157 if (!cpu_guest_has_contextconfig)
2158 return -EINVAL;
2159 write_gc0_contextconfig(v);
2160 break;
2161 case KVM_REG_MIPS_CP0_USERLOCAL:
2162 if (!cpu_guest_has_userlocal)
2163 return -EINVAL;
2164 write_gc0_userlocal(v);
2165 break;
2166#ifdef CONFIG_64BIT
2167 case KVM_REG_MIPS_CP0_XCONTEXTCONFIG:
2168 if (!cpu_guest_has_contextconfig)
2169 return -EINVAL;
2170 write_gc0_xcontextconfig(v);
2171 break;
2172#endif
2173 case KVM_REG_MIPS_CP0_PAGEMASK:
2174 write_gc0_pagemask(v);
2175 break;
2176 case KVM_REG_MIPS_CP0_PAGEGRAIN:
2177 write_gc0_pagegrain(v);
2178 break;
2179 case KVM_REG_MIPS_CP0_SEGCTL0:
2180 if (!cpu_guest_has_segments)
2181 return -EINVAL;
2182 write_gc0_segctl0(v);
2183 break;
2184 case KVM_REG_MIPS_CP0_SEGCTL1:
2185 if (!cpu_guest_has_segments)
2186 return -EINVAL;
2187 write_gc0_segctl1(v);
2188 break;
2189 case KVM_REG_MIPS_CP0_SEGCTL2:
2190 if (!cpu_guest_has_segments)
2191 return -EINVAL;
2192 write_gc0_segctl2(v);
2193 break;
2194 case KVM_REG_MIPS_CP0_PWBASE:
2195 if (!cpu_guest_has_htw && !cpu_guest_has_ldpte)
2196 return -EINVAL;
2197 write_gc0_pwbase(v);
2198 break;
2199 case KVM_REG_MIPS_CP0_PWFIELD:
2200 if (!cpu_guest_has_htw && !cpu_guest_has_ldpte)
2201 return -EINVAL;
2202 write_gc0_pwfield(v);
2203 break;
2204 case KVM_REG_MIPS_CP0_PWSIZE:
2205 if (!cpu_guest_has_htw && !cpu_guest_has_ldpte)
2206 return -EINVAL;
2207 write_gc0_pwsize(v);
2208 break;
2209 case KVM_REG_MIPS_CP0_WIRED:
2210 change_gc0_wired(MIPSR6_WIRED_WIRED, v);
2211 break;
2212 case KVM_REG_MIPS_CP0_PWCTL:
2213 if (!cpu_guest_has_htw && !cpu_guest_has_ldpte)
2214 return -EINVAL;
2215 write_gc0_pwctl(v);
2216 break;
2217 case KVM_REG_MIPS_CP0_HWRENA:
2218 write_gc0_hwrena(v);
2219 break;
2220 case KVM_REG_MIPS_CP0_BADVADDR:
2221 write_gc0_badvaddr(v);
2222 break;
2223 case KVM_REG_MIPS_CP0_BADINSTR:
2224 if (!cpu_guest_has_badinstr)
2225 return -EINVAL;
2226 write_gc0_badinstr(v);
2227 break;
2228 case KVM_REG_MIPS_CP0_BADINSTRP:
2229 if (!cpu_guest_has_badinstrp)
2230 return -EINVAL;
2231 write_gc0_badinstrp(v);
2232 break;
2233 case KVM_REG_MIPS_CP0_COUNT:
2234 kvm_mips_write_count(vcpu, v);
2235 break;
2236 case KVM_REG_MIPS_CP0_ENTRYHI:
2237 write_gc0_entryhi(v);
2238 break;
2239 case KVM_REG_MIPS_CP0_COMPARE:
2240 kvm_mips_write_compare(vcpu, v, false);
2241 break;
2242 case KVM_REG_MIPS_CP0_STATUS:
2243 write_gc0_status(v);
2244 break;
2245 case KVM_REG_MIPS_CP0_INTCTL:
2246 write_gc0_intctl(v);
2247 break;
2248 case KVM_REG_MIPS_CP0_CAUSE:
2249 /*
2250 * If the timer is stopped or started (DC bit) it must look
2251 * atomic with changes to the timer interrupt pending bit (TI).
2252 * A timer interrupt should not happen in between.
2253 */
2254 if ((read_gc0_cause() ^ v) & CAUSEF_DC) {
2255 if (v & CAUSEF_DC) {
2256 /* disable timer first */
2257 kvm_mips_count_disable_cause(vcpu);
2258 change_gc0_cause((u32)~CAUSEF_DC, v);
2259 } else {
2260 /* enable timer last */
2261 change_gc0_cause((u32)~CAUSEF_DC, v);
2262 kvm_mips_count_enable_cause(vcpu);
2263 }
2264 } else {
2265 write_gc0_cause(v);
2266 }
2267 break;
2268 case KVM_REG_MIPS_CP0_EPC:
2269 write_gc0_epc(v);
2270 break;
2271 case KVM_REG_MIPS_CP0_PRID:
2272 switch (boot_cpu_type()) {
2273 case CPU_CAVIUM_OCTEON3:
2274 /* Octeon III has a guest.PRid, but its read-only */
2275 break;
2276 default:
2277 kvm_write_c0_guest_prid(cop0, v);
2278 break;
2279 }
2280 break;
2281 case KVM_REG_MIPS_CP0_EBASE:
2282 kvm_vz_write_gc0_ebase(v);
2283 break;
2284 case KVM_REG_MIPS_CP0_CONFIG:
2285 cur = read_gc0_config();
2286 change = (cur ^ v) & kvm_vz_config_user_wrmask(vcpu);
2287 if (change) {
2288 v = cur ^ change;
2289 write_gc0_config(v);
2290 }
2291 break;
2292 case KVM_REG_MIPS_CP0_CONFIG1:
2293 if (!cpu_guest_has_conf1)
2294 break;
2295 cur = read_gc0_config1();
2296 change = (cur ^ v) & kvm_vz_config1_user_wrmask(vcpu);
2297 if (change) {
2298 v = cur ^ change;
2299 write_gc0_config1(v);
2300 }
2301 break;
2302 case KVM_REG_MIPS_CP0_CONFIG2:
2303 if (!cpu_guest_has_conf2)
2304 break;
2305 cur = read_gc0_config2();
2306 change = (cur ^ v) & kvm_vz_config2_user_wrmask(vcpu);
2307 if (change) {
2308 v = cur ^ change;
2309 write_gc0_config2(v);
2310 }
2311 break;
2312 case KVM_REG_MIPS_CP0_CONFIG3:
2313 if (!cpu_guest_has_conf3)
2314 break;
2315 cur = read_gc0_config3();
2316 change = (cur ^ v) & kvm_vz_config3_user_wrmask(vcpu);
2317 if (change) {
2318 v = cur ^ change;
2319 write_gc0_config3(v);
2320 }
2321 break;
2322 case KVM_REG_MIPS_CP0_CONFIG4:
2323 if (!cpu_guest_has_conf4)
2324 break;
2325 cur = read_gc0_config4();
2326 change = (cur ^ v) & kvm_vz_config4_user_wrmask(vcpu);
2327 if (change) {
2328 v = cur ^ change;
2329 write_gc0_config4(v);
2330 }
2331 break;
2332 case KVM_REG_MIPS_CP0_CONFIG5:
2333 if (!cpu_guest_has_conf5)
2334 break;
2335 cur = read_gc0_config5();
2336 change = (cur ^ v) & kvm_vz_config5_user_wrmask(vcpu);
2337 if (change) {
2338 v = cur ^ change;
2339 write_gc0_config5(v);
2340 }
2341 break;
2342 case KVM_REG_MIPS_CP0_CONFIG6:
2343 cur = kvm_read_sw_gc0_config6(cop0);
2344 change = (cur ^ v) & kvm_vz_config6_user_wrmask(vcpu);
2345 if (change) {
2346 v = cur ^ change;
2347 kvm_write_sw_gc0_config6(cop0, (int)v);
2348 }
2349 break;
2350 case KVM_REG_MIPS_CP0_MAAR(0) ... KVM_REG_MIPS_CP0_MAAR(0x3f):
2351 if (!cpu_guest_has_maar || cpu_guest_has_dyn_maar)
2352 return -EINVAL;
2353 idx = reg->id - KVM_REG_MIPS_CP0_MAAR(0);
2354 if (idx >= ARRAY_SIZE(vcpu->arch.maar))
2355 return -EINVAL;
2356 vcpu->arch.maar[idx] = mips_process_maar(dmtc_op, v);
2357 break;
2358 case KVM_REG_MIPS_CP0_MAARI:
2359 if (!cpu_guest_has_maar || cpu_guest_has_dyn_maar)
2360 return -EINVAL;
2361 kvm_write_maari(vcpu, v);
2362 break;
2363#ifdef CONFIG_64BIT
2364 case KVM_REG_MIPS_CP0_XCONTEXT:
2365 write_gc0_xcontext(v);
2366 break;
2367#endif
2368 case KVM_REG_MIPS_CP0_ERROREPC:
2369 write_gc0_errorepc(v);
2370 break;
2371 case KVM_REG_MIPS_CP0_KSCRATCH1 ... KVM_REG_MIPS_CP0_KSCRATCH6:
2372 idx = reg->id - KVM_REG_MIPS_CP0_KSCRATCH1 + 2;
2373 if (!cpu_guest_has_kscr(idx))
2374 return -EINVAL;
2375 switch (idx) {
2376 case 2:
2377 write_gc0_kscratch1(v);
2378 break;
2379 case 3:
2380 write_gc0_kscratch2(v);
2381 break;
2382 case 4:
2383 write_gc0_kscratch3(v);
2384 break;
2385 case 5:
2386 write_gc0_kscratch4(v);
2387 break;
2388 case 6:
2389 write_gc0_kscratch5(v);
2390 break;
2391 case 7:
2392 write_gc0_kscratch6(v);
2393 break;
2394 }
2395 break;
2396 case KVM_REG_MIPS_COUNT_CTL:
2397 ret = kvm_mips_set_count_ctl(vcpu, v);
2398 break;
2399 case KVM_REG_MIPS_COUNT_RESUME:
2400 ret = kvm_mips_set_count_resume(vcpu, v);
2401 break;
2402 case KVM_REG_MIPS_COUNT_HZ:
2403 ret = kvm_mips_set_count_hz(vcpu, v);
2404 break;
2405 default:
2406 return -EINVAL;
2407 }
2408 return ret;
2409}
2410
2411#define guestid_cache(cpu) (cpu_data[cpu].guestid_cache)
2412static void kvm_vz_get_new_guestid(unsigned long cpu, struct kvm_vcpu *vcpu)
2413{
2414 unsigned long guestid = guestid_cache(cpu);
2415
2416 if (!(++guestid & GUESTID_MASK)) {
2417 if (cpu_has_vtag_icache)
2418 flush_icache_all();
2419
2420 if (!guestid) /* fix version if needed */
2421 guestid = GUESTID_FIRST_VERSION;
2422
2423 ++guestid; /* guestid 0 reserved for root */
2424
2425 /* start new guestid cycle */
2426 kvm_vz_local_flush_roottlb_all_guests();
2427 kvm_vz_local_flush_guesttlb_all();
2428 }
2429
2430 guestid_cache(cpu) = guestid;
2431}
2432
2433/* Returns 1 if the guest TLB may be clobbered */
2434static int kvm_vz_check_requests(struct kvm_vcpu *vcpu, int cpu)
2435{
2436 int ret = 0;
2437 int i;
2438
2439 if (!kvm_request_pending(vcpu))
2440 return 0;
2441
2442 if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) {
2443 if (cpu_has_guestid) {
2444 /* Drop all GuestIDs for this VCPU */
2445 for_each_possible_cpu(i)
2446 vcpu->arch.vzguestid[i] = 0;
2447 /* This will clobber guest TLB contents too */
2448 ret = 1;
2449 }
2450 /*
2451 * For Root ASID Dealias (RAD) we don't do anything here, but we
2452 * still need the request to ensure we recheck asid_flush_mask.
2453 * We can still return 0 as only the root TLB will be affected
2454 * by a root ASID flush.
2455 */
2456 }
2457
2458 return ret;
2459}
2460
2461static void kvm_vz_vcpu_save_wired(struct kvm_vcpu *vcpu)
2462{
2463 unsigned int wired = read_gc0_wired();
2464 struct kvm_mips_tlb *tlbs;
2465 int i;
2466
2467 /* Expand the wired TLB array if necessary */
2468 wired &= MIPSR6_WIRED_WIRED;
2469 if (wired > vcpu->arch.wired_tlb_limit) {
2470 tlbs = krealloc(vcpu->arch.wired_tlb, wired *
2471 sizeof(*vcpu->arch.wired_tlb), GFP_ATOMIC);
2472 if (WARN_ON(!tlbs)) {
2473 /* Save whatever we can */
2474 wired = vcpu->arch.wired_tlb_limit;
2475 } else {
2476 vcpu->arch.wired_tlb = tlbs;
2477 vcpu->arch.wired_tlb_limit = wired;
2478 }
2479 }
2480
2481 if (wired)
2482 /* Save wired entries from the guest TLB */
2483 kvm_vz_save_guesttlb(vcpu->arch.wired_tlb, 0, wired);
2484 /* Invalidate any dropped entries since last time */
2485 for (i = wired; i < vcpu->arch.wired_tlb_used; ++i) {
2486 vcpu->arch.wired_tlb[i].tlb_hi = UNIQUE_GUEST_ENTRYHI(i);
2487 vcpu->arch.wired_tlb[i].tlb_lo[0] = 0;
2488 vcpu->arch.wired_tlb[i].tlb_lo[1] = 0;
2489 vcpu->arch.wired_tlb[i].tlb_mask = 0;
2490 }
2491 vcpu->arch.wired_tlb_used = wired;
2492}
2493
2494static void kvm_vz_vcpu_load_wired(struct kvm_vcpu *vcpu)
2495{
2496 /* Load wired entries into the guest TLB */
2497 if (vcpu->arch.wired_tlb)
2498 kvm_vz_load_guesttlb(vcpu->arch.wired_tlb, 0,
2499 vcpu->arch.wired_tlb_used);
2500}
2501
2502static void kvm_vz_vcpu_load_tlb(struct kvm_vcpu *vcpu, int cpu)
2503{
2504 struct kvm *kvm = vcpu->kvm;
2505 struct mm_struct *gpa_mm = &kvm->arch.gpa_mm;
2506 bool migrated;
2507
2508 /*
2509 * Are we entering guest context on a different CPU to last time?
2510 * If so, the VCPU's guest TLB state on this CPU may be stale.
2511 */
2512 migrated = (vcpu->arch.last_exec_cpu != cpu);
2513 vcpu->arch.last_exec_cpu = cpu;
2514
2515 /*
2516 * A vcpu's GuestID is set in GuestCtl1.ID when the vcpu is loaded and
2517 * remains set until another vcpu is loaded in. As a rule GuestRID
2518 * remains zeroed when in root context unless the kernel is busy
2519 * manipulating guest tlb entries.
2520 */
2521 if (cpu_has_guestid) {
2522 /*
2523 * Check if our GuestID is of an older version and thus invalid.
2524 *
2525 * We also discard the stored GuestID if we've executed on
2526 * another CPU, as the guest mappings may have changed without
2527 * hypervisor knowledge.
2528 */
2529 if (migrated ||
2530 (vcpu->arch.vzguestid[cpu] ^ guestid_cache(cpu)) &
2531 GUESTID_VERSION_MASK) {
2532 kvm_vz_get_new_guestid(cpu, vcpu);
2533 vcpu->arch.vzguestid[cpu] = guestid_cache(cpu);
2534 trace_kvm_guestid_change(vcpu,
2535 vcpu->arch.vzguestid[cpu]);
2536 }
2537
2538 /* Restore GuestID */
2539 change_c0_guestctl1(GUESTID_MASK, vcpu->arch.vzguestid[cpu]);
2540 } else {
2541 /*
2542 * The Guest TLB only stores a single guest's TLB state, so
2543 * flush it if another VCPU has executed on this CPU.
2544 *
2545 * We also flush if we've executed on another CPU, as the guest
2546 * mappings may have changed without hypervisor knowledge.
2547 */
2548 if (migrated || last_exec_vcpu[cpu] != vcpu)
2549 kvm_vz_local_flush_guesttlb_all();
2550 last_exec_vcpu[cpu] = vcpu;
2551
2552 /*
2553 * Root ASID dealiases guest GPA mappings in the root TLB.
2554 * Allocate new root ASID if needed.
2555 */
2556 if (cpumask_test_and_clear_cpu(cpu, &kvm->arch.asid_flush_mask))
2557 get_new_mmu_context(gpa_mm);
2558 else
2559 check_mmu_context(gpa_mm);
2560 }
2561}
2562
2563static int kvm_vz_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
2564{
2565 struct mips_coproc *cop0 = vcpu->arch.cop0;
2566 bool migrated, all;
2567
2568 /*
2569 * Have we migrated to a different CPU?
2570 * If so, any old guest TLB state may be stale.
2571 */
2572 migrated = (vcpu->arch.last_sched_cpu != cpu);
2573
2574 /*
2575 * Was this the last VCPU to run on this CPU?
2576 * If not, any old guest state from this VCPU will have been clobbered.
2577 */
2578 all = migrated || (last_vcpu[cpu] != vcpu);
2579 last_vcpu[cpu] = vcpu;
2580
2581 /*
2582 * Restore CP0_Wired unconditionally as we clear it after use, and
2583 * restore wired guest TLB entries (while in guest context).
2584 */
2585 kvm_restore_gc0_wired(cop0);
2586 if (current->flags & PF_VCPU) {
2587 tlbw_use_hazard();
2588 kvm_vz_vcpu_load_tlb(vcpu, cpu);
2589 kvm_vz_vcpu_load_wired(vcpu);
2590 }
2591
2592 /*
2593 * Restore timer state regardless, as e.g. Cause.TI can change over time
2594 * if left unmaintained.
2595 */
2596 kvm_vz_restore_timer(vcpu);
2597
2598 /* Set MC bit if we want to trace guest mode changes */
2599 if (kvm_trace_guest_mode_change)
2600 set_c0_guestctl0(MIPS_GCTL0_MC);
2601 else
2602 clear_c0_guestctl0(MIPS_GCTL0_MC);
2603
2604 /* Don't bother restoring registers multiple times unless necessary */
2605 if (!all)
2606 return 0;
2607
2608 /*
2609 * Restore config registers first, as some implementations restrict
2610 * writes to other registers when the corresponding feature bits aren't
2611 * set. For example Status.CU1 cannot be set unless Config1.FP is set.
2612 */
2613 kvm_restore_gc0_config(cop0);
2614 if (cpu_guest_has_conf1)
2615 kvm_restore_gc0_config1(cop0);
2616 if (cpu_guest_has_conf2)
2617 kvm_restore_gc0_config2(cop0);
2618 if (cpu_guest_has_conf3)
2619 kvm_restore_gc0_config3(cop0);
2620 if (cpu_guest_has_conf4)
2621 kvm_restore_gc0_config4(cop0);
2622 if (cpu_guest_has_conf5)
2623 kvm_restore_gc0_config5(cop0);
2624 if (cpu_guest_has_conf6)
2625 kvm_restore_gc0_config6(cop0);
2626 if (cpu_guest_has_conf7)
2627 kvm_restore_gc0_config7(cop0);
2628
2629 kvm_restore_gc0_index(cop0);
2630 kvm_restore_gc0_entrylo0(cop0);
2631 kvm_restore_gc0_entrylo1(cop0);
2632 kvm_restore_gc0_context(cop0);
2633 if (cpu_guest_has_contextconfig)
2634 kvm_restore_gc0_contextconfig(cop0);
2635#ifdef CONFIG_64BIT
2636 kvm_restore_gc0_xcontext(cop0);
2637 if (cpu_guest_has_contextconfig)
2638 kvm_restore_gc0_xcontextconfig(cop0);
2639#endif
2640 kvm_restore_gc0_pagemask(cop0);
2641 kvm_restore_gc0_pagegrain(cop0);
2642 kvm_restore_gc0_hwrena(cop0);
2643 kvm_restore_gc0_badvaddr(cop0);
2644 kvm_restore_gc0_entryhi(cop0);
2645 kvm_restore_gc0_status(cop0);
2646 kvm_restore_gc0_intctl(cop0);
2647 kvm_restore_gc0_epc(cop0);
2648 kvm_vz_write_gc0_ebase(kvm_read_sw_gc0_ebase(cop0));
2649 if (cpu_guest_has_userlocal)
2650 kvm_restore_gc0_userlocal(cop0);
2651
2652 kvm_restore_gc0_errorepc(cop0);
2653
2654 /* restore KScratch registers if enabled in guest */
2655 if (cpu_guest_has_conf4) {
2656 if (cpu_guest_has_kscr(2))
2657 kvm_restore_gc0_kscratch1(cop0);
2658 if (cpu_guest_has_kscr(3))
2659 kvm_restore_gc0_kscratch2(cop0);
2660 if (cpu_guest_has_kscr(4))
2661 kvm_restore_gc0_kscratch3(cop0);
2662 if (cpu_guest_has_kscr(5))
2663 kvm_restore_gc0_kscratch4(cop0);
2664 if (cpu_guest_has_kscr(6))
2665 kvm_restore_gc0_kscratch5(cop0);
2666 if (cpu_guest_has_kscr(7))
2667 kvm_restore_gc0_kscratch6(cop0);
2668 }
2669
2670 if (cpu_guest_has_badinstr)
2671 kvm_restore_gc0_badinstr(cop0);
2672 if (cpu_guest_has_badinstrp)
2673 kvm_restore_gc0_badinstrp(cop0);
2674
2675 if (cpu_guest_has_segments) {
2676 kvm_restore_gc0_segctl0(cop0);
2677 kvm_restore_gc0_segctl1(cop0);
2678 kvm_restore_gc0_segctl2(cop0);
2679 }
2680
2681 /* restore HTW registers */
2682 if (cpu_guest_has_htw || cpu_guest_has_ldpte) {
2683 kvm_restore_gc0_pwbase(cop0);
2684 kvm_restore_gc0_pwfield(cop0);
2685 kvm_restore_gc0_pwsize(cop0);
2686 kvm_restore_gc0_pwctl(cop0);
2687 }
2688
2689 /* restore Root.GuestCtl2 from unused Guest guestctl2 register */
2690 if (cpu_has_guestctl2)
2691 write_c0_guestctl2(
2692 cop0->reg[MIPS_CP0_GUESTCTL2][MIPS_CP0_GUESTCTL2_SEL]);
2693
2694 /*
2695 * We should clear linked load bit to break interrupted atomics. This
2696 * prevents a SC on the next VCPU from succeeding by matching a LL on
2697 * the previous VCPU.
2698 */
2699 if (vcpu->kvm->created_vcpus > 1)
2700 write_gc0_lladdr(0);
2701
2702 return 0;
2703}
2704
2705static int kvm_vz_vcpu_put(struct kvm_vcpu *vcpu, int cpu)
2706{
2707 struct mips_coproc *cop0 = vcpu->arch.cop0;
2708
2709 if (current->flags & PF_VCPU)
2710 kvm_vz_vcpu_save_wired(vcpu);
2711
2712 kvm_lose_fpu(vcpu);
2713
2714 kvm_save_gc0_index(cop0);
2715 kvm_save_gc0_entrylo0(cop0);
2716 kvm_save_gc0_entrylo1(cop0);
2717 kvm_save_gc0_context(cop0);
2718 if (cpu_guest_has_contextconfig)
2719 kvm_save_gc0_contextconfig(cop0);
2720#ifdef CONFIG_64BIT
2721 kvm_save_gc0_xcontext(cop0);
2722 if (cpu_guest_has_contextconfig)
2723 kvm_save_gc0_xcontextconfig(cop0);
2724#endif
2725 kvm_save_gc0_pagemask(cop0);
2726 kvm_save_gc0_pagegrain(cop0);
2727 kvm_save_gc0_wired(cop0);
2728 /* allow wired TLB entries to be overwritten */
2729 clear_gc0_wired(MIPSR6_WIRED_WIRED);
2730 kvm_save_gc0_hwrena(cop0);
2731 kvm_save_gc0_badvaddr(cop0);
2732 kvm_save_gc0_entryhi(cop0);
2733 kvm_save_gc0_status(cop0);
2734 kvm_save_gc0_intctl(cop0);
2735 kvm_save_gc0_epc(cop0);
2736 kvm_write_sw_gc0_ebase(cop0, kvm_vz_read_gc0_ebase());
2737 if (cpu_guest_has_userlocal)
2738 kvm_save_gc0_userlocal(cop0);
2739
2740 /* only save implemented config registers */
2741 kvm_save_gc0_config(cop0);
2742 if (cpu_guest_has_conf1)
2743 kvm_save_gc0_config1(cop0);
2744 if (cpu_guest_has_conf2)
2745 kvm_save_gc0_config2(cop0);
2746 if (cpu_guest_has_conf3)
2747 kvm_save_gc0_config3(cop0);
2748 if (cpu_guest_has_conf4)
2749 kvm_save_gc0_config4(cop0);
2750 if (cpu_guest_has_conf5)
2751 kvm_save_gc0_config5(cop0);
2752 if (cpu_guest_has_conf6)
2753 kvm_save_gc0_config6(cop0);
2754 if (cpu_guest_has_conf7)
2755 kvm_save_gc0_config7(cop0);
2756
2757 kvm_save_gc0_errorepc(cop0);
2758
2759 /* save KScratch registers if enabled in guest */
2760 if (cpu_guest_has_conf4) {
2761 if (cpu_guest_has_kscr(2))
2762 kvm_save_gc0_kscratch1(cop0);
2763 if (cpu_guest_has_kscr(3))
2764 kvm_save_gc0_kscratch2(cop0);
2765 if (cpu_guest_has_kscr(4))
2766 kvm_save_gc0_kscratch3(cop0);
2767 if (cpu_guest_has_kscr(5))
2768 kvm_save_gc0_kscratch4(cop0);
2769 if (cpu_guest_has_kscr(6))
2770 kvm_save_gc0_kscratch5(cop0);
2771 if (cpu_guest_has_kscr(7))
2772 kvm_save_gc0_kscratch6(cop0);
2773 }
2774
2775 if (cpu_guest_has_badinstr)
2776 kvm_save_gc0_badinstr(cop0);
2777 if (cpu_guest_has_badinstrp)
2778 kvm_save_gc0_badinstrp(cop0);
2779
2780 if (cpu_guest_has_segments) {
2781 kvm_save_gc0_segctl0(cop0);
2782 kvm_save_gc0_segctl1(cop0);
2783 kvm_save_gc0_segctl2(cop0);
2784 }
2785
2786 /* save HTW registers if enabled in guest */
2787 if (cpu_guest_has_ldpte || (cpu_guest_has_htw &&
2788 kvm_read_sw_gc0_config3(cop0) & MIPS_CONF3_PW)) {
2789 kvm_save_gc0_pwbase(cop0);
2790 kvm_save_gc0_pwfield(cop0);
2791 kvm_save_gc0_pwsize(cop0);
2792 kvm_save_gc0_pwctl(cop0);
2793 }
2794
2795 kvm_vz_save_timer(vcpu);
2796
2797 /* save Root.GuestCtl2 in unused Guest guestctl2 register */
2798 if (cpu_has_guestctl2)
2799 cop0->reg[MIPS_CP0_GUESTCTL2][MIPS_CP0_GUESTCTL2_SEL] =
2800 read_c0_guestctl2();
2801
2802 return 0;
2803}
2804
2805/**
2806 * kvm_vz_resize_guest_vtlb() - Attempt to resize guest VTLB.
2807 * @size: Number of guest VTLB entries (0 < @size <= root VTLB entries).
2808 *
2809 * Attempt to resize the guest VTLB by writing guest Config registers. This is
2810 * necessary for cores with a shared root/guest TLB to avoid overlap with wired
2811 * entries in the root VTLB.
2812 *
2813 * Returns: The resulting guest VTLB size.
2814 */
2815static unsigned int kvm_vz_resize_guest_vtlb(unsigned int size)
2816{
2817 unsigned int config4 = 0, ret = 0, limit;
2818
2819 /* Write MMUSize - 1 into guest Config registers */
2820 if (cpu_guest_has_conf1)
2821 change_gc0_config1(MIPS_CONF1_TLBS,
2822 (size - 1) << MIPS_CONF1_TLBS_SHIFT);
2823 if (cpu_guest_has_conf4) {
2824 config4 = read_gc0_config4();
2825 if (cpu_has_mips_r6 || (config4 & MIPS_CONF4_MMUEXTDEF) ==
2826 MIPS_CONF4_MMUEXTDEF_VTLBSIZEEXT) {
2827 config4 &= ~MIPS_CONF4_VTLBSIZEEXT;
2828 config4 |= ((size - 1) >> MIPS_CONF1_TLBS_SIZE) <<
2829 MIPS_CONF4_VTLBSIZEEXT_SHIFT;
2830 } else if ((config4 & MIPS_CONF4_MMUEXTDEF) ==
2831 MIPS_CONF4_MMUEXTDEF_MMUSIZEEXT) {
2832 config4 &= ~MIPS_CONF4_MMUSIZEEXT;
2833 config4 |= ((size - 1) >> MIPS_CONF1_TLBS_SIZE) <<
2834 MIPS_CONF4_MMUSIZEEXT_SHIFT;
2835 }
2836 write_gc0_config4(config4);
2837 }
2838
2839 /*
2840 * Set Guest.Wired.Limit = 0 (no limit up to Guest.MMUSize-1), unless it
2841 * would exceed Root.Wired.Limit (clearing Guest.Wired.Wired so write
2842 * not dropped)
2843 */
2844 if (cpu_has_mips_r6) {
2845 limit = (read_c0_wired() & MIPSR6_WIRED_LIMIT) >>
2846 MIPSR6_WIRED_LIMIT_SHIFT;
2847 if (size - 1 <= limit)
2848 limit = 0;
2849 write_gc0_wired(limit << MIPSR6_WIRED_LIMIT_SHIFT);
2850 }
2851
2852 /* Read back MMUSize - 1 */
2853 back_to_back_c0_hazard();
2854 if (cpu_guest_has_conf1)
2855 ret = (read_gc0_config1() & MIPS_CONF1_TLBS) >>
2856 MIPS_CONF1_TLBS_SHIFT;
2857 if (config4) {
2858 if (cpu_has_mips_r6 || (config4 & MIPS_CONF4_MMUEXTDEF) ==
2859 MIPS_CONF4_MMUEXTDEF_VTLBSIZEEXT)
2860 ret |= ((config4 & MIPS_CONF4_VTLBSIZEEXT) >>
2861 MIPS_CONF4_VTLBSIZEEXT_SHIFT) <<
2862 MIPS_CONF1_TLBS_SIZE;
2863 else if ((config4 & MIPS_CONF4_MMUEXTDEF) ==
2864 MIPS_CONF4_MMUEXTDEF_MMUSIZEEXT)
2865 ret |= ((config4 & MIPS_CONF4_MMUSIZEEXT) >>
2866 MIPS_CONF4_MMUSIZEEXT_SHIFT) <<
2867 MIPS_CONF1_TLBS_SIZE;
2868 }
2869 return ret + 1;
2870}
2871
2872static int kvm_vz_hardware_enable(void)
2873{
2874 unsigned int mmu_size, guest_mmu_size, ftlb_size;
2875 u64 guest_cvmctl, cvmvmconfig;
2876
2877 switch (current_cpu_type()) {
2878 case CPU_CAVIUM_OCTEON3:
2879 /* Set up guest timer/perfcount IRQ lines */
2880 guest_cvmctl = read_gc0_cvmctl();
2881 guest_cvmctl &= ~CVMCTL_IPTI;
2882 guest_cvmctl |= 7ull << CVMCTL_IPTI_SHIFT;
2883 guest_cvmctl &= ~CVMCTL_IPPCI;
2884 guest_cvmctl |= 6ull << CVMCTL_IPPCI_SHIFT;
2885 write_gc0_cvmctl(guest_cvmctl);
2886
2887 cvmvmconfig = read_c0_cvmvmconfig();
2888 /* No I/O hole translation. */
2889 cvmvmconfig |= CVMVMCONF_DGHT;
2890 /* Halve the root MMU size */
2891 mmu_size = ((cvmvmconfig & CVMVMCONF_MMUSIZEM1)
2892 >> CVMVMCONF_MMUSIZEM1_S) + 1;
2893 guest_mmu_size = mmu_size / 2;
2894 mmu_size -= guest_mmu_size;
2895 cvmvmconfig &= ~CVMVMCONF_RMMUSIZEM1;
2896 cvmvmconfig |= mmu_size - 1;
2897 write_c0_cvmvmconfig(cvmvmconfig);
2898
2899 /* Update our records */
2900 current_cpu_data.tlbsize = mmu_size;
2901 current_cpu_data.tlbsizevtlb = mmu_size;
2902 current_cpu_data.guest.tlbsize = guest_mmu_size;
2903
2904 /* Flush moved entries in new (guest) context */
2905 kvm_vz_local_flush_guesttlb_all();
2906 break;
2907 default:
2908 /*
2909 * ImgTec cores tend to use a shared root/guest TLB. To avoid
2910 * overlap of root wired and guest entries, the guest TLB may
2911 * need resizing.
2912 */
2913 mmu_size = current_cpu_data.tlbsizevtlb;
2914 ftlb_size = current_cpu_data.tlbsize - mmu_size;
2915
2916 /* Try switching to maximum guest VTLB size for flush */
2917 guest_mmu_size = kvm_vz_resize_guest_vtlb(mmu_size);
2918 current_cpu_data.guest.tlbsize = guest_mmu_size + ftlb_size;
2919 kvm_vz_local_flush_guesttlb_all();
2920
2921 /*
2922 * Reduce to make space for root wired entries and at least 2
2923 * root non-wired entries. This does assume that long-term wired
2924 * entries won't be added later.
2925 */
2926 guest_mmu_size = mmu_size - num_wired_entries() - 2;
2927 guest_mmu_size = kvm_vz_resize_guest_vtlb(guest_mmu_size);
2928 current_cpu_data.guest.tlbsize = guest_mmu_size + ftlb_size;
2929
2930 /*
2931 * Write the VTLB size, but if another CPU has already written,
2932 * check it matches or we won't provide a consistent view to the
2933 * guest. If this ever happens it suggests an asymmetric number
2934 * of wired entries.
2935 */
2936 if (cmpxchg(&kvm_vz_guest_vtlb_size, 0, guest_mmu_size) &&
2937 WARN(guest_mmu_size != kvm_vz_guest_vtlb_size,
2938 "Available guest VTLB size mismatch"))
2939 return -EINVAL;
2940 break;
2941 }
2942
2943 /*
2944 * Enable virtualization features granting guest direct control of
2945 * certain features:
2946 * CP0=1: Guest coprocessor 0 context.
2947 * AT=Guest: Guest MMU.
2948 * CG=1: Hit (virtual address) CACHE operations (optional).
2949 * CF=1: Guest Config registers.
2950 * CGI=1: Indexed flush CACHE operations (optional).
2951 */
2952 write_c0_guestctl0(MIPS_GCTL0_CP0 |
2953 (MIPS_GCTL0_AT_GUEST << MIPS_GCTL0_AT_SHIFT) |
2954 MIPS_GCTL0_CG | MIPS_GCTL0_CF);
2955 if (cpu_has_guestctl0ext) {
2956 if (current_cpu_type() != CPU_LOONGSON64)
2957 set_c0_guestctl0ext(MIPS_GCTL0EXT_CGI);
2958 else
2959 clear_c0_guestctl0ext(MIPS_GCTL0EXT_CGI);
2960 }
2961
2962 if (cpu_has_guestid) {
2963 write_c0_guestctl1(0);
2964 kvm_vz_local_flush_roottlb_all_guests();
2965
2966 GUESTID_MASK = current_cpu_data.guestid_mask;
2967 GUESTID_FIRST_VERSION = GUESTID_MASK + 1;
2968 GUESTID_VERSION_MASK = ~GUESTID_MASK;
2969
2970 current_cpu_data.guestid_cache = GUESTID_FIRST_VERSION;
2971 }
2972
2973 /* clear any pending injected virtual guest interrupts */
2974 if (cpu_has_guestctl2)
2975 clear_c0_guestctl2(0x3f << 10);
2976
2977#ifdef CONFIG_CPU_LOONGSON64
2978 /* Control guest CCA attribute */
2979 if (cpu_has_csr())
2980 csr_writel(csr_readl(0xffffffec) | 0x1, 0xffffffec);
2981#endif
2982
2983 return 0;
2984}
2985
2986static void kvm_vz_hardware_disable(void)
2987{
2988 u64 cvmvmconfig;
2989 unsigned int mmu_size;
2990
2991 /* Flush any remaining guest TLB entries */
2992 kvm_vz_local_flush_guesttlb_all();
2993
2994 switch (current_cpu_type()) {
2995 case CPU_CAVIUM_OCTEON3:
2996 /*
2997 * Allocate whole TLB for root. Existing guest TLB entries will
2998 * change ownership to the root TLB. We should be safe though as
2999 * they've already been flushed above while in guest TLB.
3000 */
3001 cvmvmconfig = read_c0_cvmvmconfig();
3002 mmu_size = ((cvmvmconfig & CVMVMCONF_MMUSIZEM1)
3003 >> CVMVMCONF_MMUSIZEM1_S) + 1;
3004 cvmvmconfig &= ~CVMVMCONF_RMMUSIZEM1;
3005 cvmvmconfig |= mmu_size - 1;
3006 write_c0_cvmvmconfig(cvmvmconfig);
3007
3008 /* Update our records */
3009 current_cpu_data.tlbsize = mmu_size;
3010 current_cpu_data.tlbsizevtlb = mmu_size;
3011 current_cpu_data.guest.tlbsize = 0;
3012
3013 /* Flush moved entries in new (root) context */
3014 local_flush_tlb_all();
3015 break;
3016 }
3017
3018 if (cpu_has_guestid) {
3019 write_c0_guestctl1(0);
3020 kvm_vz_local_flush_roottlb_all_guests();
3021 }
3022}
3023
3024static int kvm_vz_check_extension(struct kvm *kvm, long ext)
3025{
3026 int r;
3027
3028 switch (ext) {
3029 case KVM_CAP_MIPS_VZ:
3030 /* we wouldn't be here unless cpu_has_vz */
3031 r = 1;
3032 break;
3033#ifdef CONFIG_64BIT
3034 case KVM_CAP_MIPS_64BIT:
3035 /* We support 64-bit registers/operations and addresses */
3036 r = 2;
3037 break;
3038#endif
3039 case KVM_CAP_IOEVENTFD:
3040 r = 1;
3041 break;
3042 default:
3043 r = 0;
3044 break;
3045 }
3046
3047 return r;
3048}
3049
3050static int kvm_vz_vcpu_init(struct kvm_vcpu *vcpu)
3051{
3052 int i;
3053
3054 for_each_possible_cpu(i)
3055 vcpu->arch.vzguestid[i] = 0;
3056
3057 return 0;
3058}
3059
3060static void kvm_vz_vcpu_uninit(struct kvm_vcpu *vcpu)
3061{
3062 int cpu;
3063
3064 /*
3065 * If the VCPU is freed and reused as another VCPU, we don't want the
3066 * matching pointer wrongly hanging around in last_vcpu[] or
3067 * last_exec_vcpu[].
3068 */
3069 for_each_possible_cpu(cpu) {
3070 if (last_vcpu[cpu] == vcpu)
3071 last_vcpu[cpu] = NULL;
3072 if (last_exec_vcpu[cpu] == vcpu)
3073 last_exec_vcpu[cpu] = NULL;
3074 }
3075}
3076
3077static int kvm_vz_vcpu_setup(struct kvm_vcpu *vcpu)
3078{
3079 struct mips_coproc *cop0 = vcpu->arch.cop0;
3080 unsigned long count_hz = 100*1000*1000; /* default to 100 MHz */
3081
3082 /*
3083 * Start off the timer at the same frequency as the host timer, but the
3084 * soft timer doesn't handle frequencies greater than 1GHz yet.
3085 */
3086 if (mips_hpt_frequency && mips_hpt_frequency <= NSEC_PER_SEC)
3087 count_hz = mips_hpt_frequency;
3088 kvm_mips_init_count(vcpu, count_hz);
3089
3090 /*
3091 * Initialize guest register state to valid architectural reset state.
3092 */
3093
3094 /* PageGrain */
3095 if (cpu_has_mips_r5 || cpu_has_mips_r6)
3096 kvm_write_sw_gc0_pagegrain(cop0, PG_RIE | PG_XIE | PG_IEC);
3097 /* Wired */
3098 if (cpu_has_mips_r6)
3099 kvm_write_sw_gc0_wired(cop0,
3100 read_gc0_wired() & MIPSR6_WIRED_LIMIT);
3101 /* Status */
3102 kvm_write_sw_gc0_status(cop0, ST0_BEV | ST0_ERL);
3103 if (cpu_has_mips_r5 || cpu_has_mips_r6)
3104 kvm_change_sw_gc0_status(cop0, ST0_FR, read_gc0_status());
3105 /* IntCtl */
3106 kvm_write_sw_gc0_intctl(cop0, read_gc0_intctl() &
3107 (INTCTLF_IPFDC | INTCTLF_IPPCI | INTCTLF_IPTI));
3108 /* PRId */
3109 kvm_write_sw_gc0_prid(cop0, boot_cpu_data.processor_id);
3110 /* EBase */
3111 kvm_write_sw_gc0_ebase(cop0, (s32)0x80000000 | vcpu->vcpu_id);
3112 /* Config */
3113 kvm_save_gc0_config(cop0);
3114 /* architecturally writable (e.g. from guest) */
3115 kvm_change_sw_gc0_config(cop0, CONF_CM_CMASK,
3116 _page_cachable_default >> _CACHE_SHIFT);
3117 /* architecturally read only, but maybe writable from root */
3118 kvm_change_sw_gc0_config(cop0, MIPS_CONF_MT, read_c0_config());
3119 if (cpu_guest_has_conf1) {
3120 kvm_set_sw_gc0_config(cop0, MIPS_CONF_M);
3121 /* Config1 */
3122 kvm_save_gc0_config1(cop0);
3123 /* architecturally read only, but maybe writable from root */
3124 kvm_clear_sw_gc0_config1(cop0, MIPS_CONF1_C2 |
3125 MIPS_CONF1_MD |
3126 MIPS_CONF1_PC |
3127 MIPS_CONF1_WR |
3128 MIPS_CONF1_CA |
3129 MIPS_CONF1_FP);
3130 }
3131 if (cpu_guest_has_conf2) {
3132 kvm_set_sw_gc0_config1(cop0, MIPS_CONF_M);
3133 /* Config2 */
3134 kvm_save_gc0_config2(cop0);
3135 }
3136 if (cpu_guest_has_conf3) {
3137 kvm_set_sw_gc0_config2(cop0, MIPS_CONF_M);
3138 /* Config3 */
3139 kvm_save_gc0_config3(cop0);
3140 /* architecturally writable (e.g. from guest) */
3141 kvm_clear_sw_gc0_config3(cop0, MIPS_CONF3_ISA_OE);
3142 /* architecturally read only, but maybe writable from root */
3143 kvm_clear_sw_gc0_config3(cop0, MIPS_CONF3_MSA |
3144 MIPS_CONF3_BPG |
3145 MIPS_CONF3_ULRI |
3146 MIPS_CONF3_DSP |
3147 MIPS_CONF3_CTXTC |
3148 MIPS_CONF3_ITL |
3149 MIPS_CONF3_LPA |
3150 MIPS_CONF3_VEIC |
3151 MIPS_CONF3_VINT |
3152 MIPS_CONF3_SP |
3153 MIPS_CONF3_CDMM |
3154 MIPS_CONF3_MT |
3155 MIPS_CONF3_SM |
3156 MIPS_CONF3_TL);
3157 }
3158 if (cpu_guest_has_conf4) {
3159 kvm_set_sw_gc0_config3(cop0, MIPS_CONF_M);
3160 /* Config4 */
3161 kvm_save_gc0_config4(cop0);
3162 }
3163 if (cpu_guest_has_conf5) {
3164 kvm_set_sw_gc0_config4(cop0, MIPS_CONF_M);
3165 /* Config5 */
3166 kvm_save_gc0_config5(cop0);
3167 /* architecturally writable (e.g. from guest) */
3168 kvm_clear_sw_gc0_config5(cop0, MIPS_CONF5_K |
3169 MIPS_CONF5_CV |
3170 MIPS_CONF5_MSAEN |
3171 MIPS_CONF5_UFE |
3172 MIPS_CONF5_FRE |
3173 MIPS_CONF5_SBRI |
3174 MIPS_CONF5_UFR);
3175 /* architecturally read only, but maybe writable from root */
3176 kvm_clear_sw_gc0_config5(cop0, MIPS_CONF5_MRP);
3177 }
3178
3179 if (cpu_guest_has_contextconfig) {
3180 /* ContextConfig */
3181 kvm_write_sw_gc0_contextconfig(cop0, 0x007ffff0);
3182#ifdef CONFIG_64BIT
3183 /* XContextConfig */
3184 /* bits SEGBITS-13+3:4 set */
3185 kvm_write_sw_gc0_xcontextconfig(cop0,
3186 ((1ull << (cpu_vmbits - 13)) - 1) << 4);
3187#endif
3188 }
3189
3190 /* Implementation dependent, use the legacy layout */
3191 if (cpu_guest_has_segments) {
3192 /* SegCtl0, SegCtl1, SegCtl2 */
3193 kvm_write_sw_gc0_segctl0(cop0, 0x00200010);
3194 kvm_write_sw_gc0_segctl1(cop0, 0x00000002 |
3195 (_page_cachable_default >> _CACHE_SHIFT) <<
3196 (16 + MIPS_SEGCFG_C_SHIFT));
3197 kvm_write_sw_gc0_segctl2(cop0, 0x00380438);
3198 }
3199
3200 /* reset HTW registers */
3201 if (cpu_guest_has_htw && (cpu_has_mips_r5 || cpu_has_mips_r6)) {
3202 /* PWField */
3203 kvm_write_sw_gc0_pwfield(cop0, 0x0c30c302);
3204 /* PWSize */
3205 kvm_write_sw_gc0_pwsize(cop0, 1 << MIPS_PWSIZE_PTW_SHIFT);
3206 }
3207
3208 /* start with no pending virtual guest interrupts */
3209 if (cpu_has_guestctl2)
3210 cop0->reg[MIPS_CP0_GUESTCTL2][MIPS_CP0_GUESTCTL2_SEL] = 0;
3211
3212 /* Put PC at reset vector */
3213 vcpu->arch.pc = CKSEG1ADDR(0x1fc00000);
3214
3215 return 0;
3216}
3217
3218static void kvm_vz_prepare_flush_shadow(struct kvm *kvm)
3219{
3220 if (!cpu_has_guestid) {
3221 /*
3222 * For each CPU there is a single GPA ASID used by all VCPUs in
3223 * the VM, so it doesn't make sense for the VCPUs to handle
3224 * invalidation of these ASIDs individually.
3225 *
3226 * Instead mark all CPUs as needing ASID invalidation in
3227 * asid_flush_mask, and kvm_flush_remote_tlbs(kvm) will
3228 * kick any running VCPUs so they check asid_flush_mask.
3229 */
3230 cpumask_setall(&kvm->arch.asid_flush_mask);
3231 }
3232}
3233
3234static void kvm_vz_vcpu_reenter(struct kvm_vcpu *vcpu)
3235{
3236 int cpu = smp_processor_id();
3237 int preserve_guest_tlb;
3238
3239 preserve_guest_tlb = kvm_vz_check_requests(vcpu, cpu);
3240
3241 if (preserve_guest_tlb)
3242 kvm_vz_vcpu_save_wired(vcpu);
3243
3244 kvm_vz_vcpu_load_tlb(vcpu, cpu);
3245
3246 if (preserve_guest_tlb)
3247 kvm_vz_vcpu_load_wired(vcpu);
3248}
3249
3250static int kvm_vz_vcpu_run(struct kvm_vcpu *vcpu)
3251{
3252 int cpu = smp_processor_id();
3253 int r;
3254
3255 kvm_vz_acquire_htimer(vcpu);
3256 /* Check if we have any exceptions/interrupts pending */
3257 kvm_mips_deliver_interrupts(vcpu, read_gc0_cause());
3258
3259 kvm_vz_check_requests(vcpu, cpu);
3260 kvm_vz_vcpu_load_tlb(vcpu, cpu);
3261 kvm_vz_vcpu_load_wired(vcpu);
3262
3263 r = vcpu->arch.vcpu_run(vcpu);
3264
3265 kvm_vz_vcpu_save_wired(vcpu);
3266
3267 return r;
3268}
3269
3270static struct kvm_mips_callbacks kvm_vz_callbacks = {
3271 .handle_cop_unusable = kvm_trap_vz_handle_cop_unusable,
3272 .handle_tlb_mod = kvm_trap_vz_handle_tlb_st_miss,
3273 .handle_tlb_ld_miss = kvm_trap_vz_handle_tlb_ld_miss,
3274 .handle_tlb_st_miss = kvm_trap_vz_handle_tlb_st_miss,
3275 .handle_addr_err_st = kvm_trap_vz_no_handler,
3276 .handle_addr_err_ld = kvm_trap_vz_no_handler,
3277 .handle_syscall = kvm_trap_vz_no_handler,
3278 .handle_res_inst = kvm_trap_vz_no_handler,
3279 .handle_break = kvm_trap_vz_no_handler,
3280 .handle_msa_disabled = kvm_trap_vz_handle_msa_disabled,
3281 .handle_guest_exit = kvm_trap_vz_handle_guest_exit,
3282
3283 .hardware_enable = kvm_vz_hardware_enable,
3284 .hardware_disable = kvm_vz_hardware_disable,
3285 .check_extension = kvm_vz_check_extension,
3286 .vcpu_init = kvm_vz_vcpu_init,
3287 .vcpu_uninit = kvm_vz_vcpu_uninit,
3288 .vcpu_setup = kvm_vz_vcpu_setup,
3289 .prepare_flush_shadow = kvm_vz_prepare_flush_shadow,
3290 .gva_to_gpa = kvm_vz_gva_to_gpa_cb,
3291 .queue_timer_int = kvm_vz_queue_timer_int_cb,
3292 .dequeue_timer_int = kvm_vz_dequeue_timer_int_cb,
3293 .queue_io_int = kvm_vz_queue_io_int_cb,
3294 .dequeue_io_int = kvm_vz_dequeue_io_int_cb,
3295 .irq_deliver = kvm_vz_irq_deliver_cb,
3296 .irq_clear = kvm_vz_irq_clear_cb,
3297 .num_regs = kvm_vz_num_regs,
3298 .copy_reg_indices = kvm_vz_copy_reg_indices,
3299 .get_one_reg = kvm_vz_get_one_reg,
3300 .set_one_reg = kvm_vz_set_one_reg,
3301 .vcpu_load = kvm_vz_vcpu_load,
3302 .vcpu_put = kvm_vz_vcpu_put,
3303 .vcpu_run = kvm_vz_vcpu_run,
3304 .vcpu_reenter = kvm_vz_vcpu_reenter,
3305};
3306
3307int kvm_mips_emulation_init(struct kvm_mips_callbacks **install_callbacks)
3308{
3309 if (!cpu_has_vz)
3310 return -ENODEV;
3311
3312 /*
3313 * VZ requires at least 2 KScratch registers, so it should have been
3314 * possible to allocate pgd_reg.
3315 */
3316 if (WARN(pgd_reg == -1,
3317 "pgd_reg not allocated even though cpu_has_vz\n"))
3318 return -ENODEV;
3319
3320 pr_info("Starting KVM with MIPS VZ extensions\n");
3321
3322 *install_callbacks = &kvm_vz_callbacks;
3323 return 0;
3324}