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c992a4f6 JH |
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 */ | |
36 | static struct kvm_vcpu *last_vcpu[NR_CPUS]; | |
37 | /* Pointers to last VCPU executed on each physical CPU */ | |
38 | static 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 | */ | |
44 | static unsigned int kvm_vz_guest_vtlb_size; | |
45 | ||
46 | static 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 | ||
54 | static 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 | ||
81 | static inline unsigned int kvm_vz_config_guest_wrmask(struct kvm_vcpu *vcpu) | |
82 | { | |
83 | return CONF_CM_CMASK; | |
84 | } | |
85 | ||
86 | static inline unsigned int kvm_vz_config1_guest_wrmask(struct kvm_vcpu *vcpu) | |
87 | { | |
88 | return 0; | |
89 | } | |
90 | ||
91 | static inline unsigned int kvm_vz_config2_guest_wrmask(struct kvm_vcpu *vcpu) | |
92 | { | |
93 | return 0; | |
94 | } | |
95 | ||
96 | static inline unsigned int kvm_vz_config3_guest_wrmask(struct kvm_vcpu *vcpu) | |
97 | { | |
98 | return MIPS_CONF3_ISA_OE; | |
99 | } | |
100 | ||
101 | static 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 | ||
107 | static 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 | |
dffe042f | 134 | * Config3: M, MSAP, [BPG], ULRI, [DSP2P, DSPP], CTXTC, [ITL, LPA, VEIC, |
c992a4f6 JH |
135 | * VInt, SP, CDMM, MT, SM, TL] |
136 | * Config4: M, [VTLBSizeExt, MMUSizeExt] | |
d42a008f | 137 | * Config5: MRP |
c992a4f6 JH |
138 | */ |
139 | ||
140 | static 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 | ||
145 | static 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 | ||
156 | static 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 | ||
161 | static 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 | | |
dffe042f | 164 | MIPS_CONF3_ULRI | MIPS_CONF3_CTXTC; |
c992a4f6 JH |
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 | ||
173 | static 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 | ||
178 | static inline unsigned int kvm_vz_config5_user_wrmask(struct kvm_vcpu *vcpu) | |
179 | { | |
d42a008f | 180 | return kvm_vz_config5_guest_wrmask(vcpu) | MIPS_CONF5_MRP; |
c992a4f6 JH |
181 | } |
182 | ||
183 | static 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 | ||
189 | static 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 | ||
195 | static 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 | ||
201 | static 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 | ||
210 | static 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 | ||
219 | static 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 | ||
247 | static 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 | ||
275 | static 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 | ||
282 | static 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 | ||
310 | static 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 | ||
f4474d50 JH |
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 | */ | |
364 | static 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 | ||
c992a4f6 JH |
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 | * | |
f4474d50 JH |
386 | * Restore VZ state relating to the soft timer. The hard timer can be enabled |
387 | * later. | |
c992a4f6 JH |
388 | */ |
389 | static 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 | /** | |
f4474d50 JH |
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 | */ | |
411 | static 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. | |
c992a4f6 JH |
444 | * @vcpu: Virtual CPU. |
445 | * | |
446 | * Restore soft timer state from saved context. | |
447 | */ | |
448 | static 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 | ||
f4474d50 JH |
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 | */ | |
469 | void 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 | */ | |
493 | static 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 | ||
c992a4f6 JH |
536 | /** |
537 | * kvm_vz_save_timer() - Save guest timer state. | |
538 | * @vcpu: Virtual CPU. | |
539 | * | |
f4474d50 JH |
540 | * Save VZ guest timer state and switch to soft guest timer if hard timer was in |
541 | * use. | |
c992a4f6 JH |
542 | */ |
543 | static void kvm_vz_save_timer(struct kvm_vcpu *vcpu) | |
544 | { | |
545 | struct mips_coproc *cop0 = vcpu->arch.cop0; | |
f4474d50 | 546 | u32 gctl0, compare, cause; |
c992a4f6 | 547 | |
f4474d50 JH |
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 | } | |
c992a4f6 JH |
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 | ||
f4474d50 JH |
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 | */ | |
572 | void 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 | ||
4b7de028 JH |
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 | */ | |
602 | static 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 | */ | |
642 | static 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 | ||
c992a4f6 JH |
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 | */ | |
714 | static int kvm_vz_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva, | |
715 | unsigned long *gpa) | |
716 | { | |
717 | u32 gva32 = gva; | |
4b7de028 | 718 | unsigned long segctl; |
c992a4f6 JH |
719 | |
720 | if ((long)gva == (s32)gva32) { | |
721 | /* Handle canonical 32-bit virtual address */ | |
4b7de028 JH |
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) { | |
c992a4f6 JH |
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 */ | |
4b7de028 JH |
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 | } | |
c992a4f6 JH |
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 | ||
4b7de028 | 802 | tlb_mapped: |
c992a4f6 JH |
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 | */ | |
821 | static 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 | ||
842 | static 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 | ||
d42a008f JH |
865 | static 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 | ||
889 | static 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 | ||
c992a4f6 JH |
900 | static 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(); | |
273819a6 JH |
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; | |
d42a008f JH |
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)]; | |
c992a4f6 JH |
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 */ | |
d42a008f JH |
970 | (rd == MIPS_CP0_LLADDR && |
971 | (sel == 2) && /* MAARI */ | |
972 | cpu_guest_has_maar && | |
973 | !cpu_guest_has_dyn_maar) || | |
c992a4f6 JH |
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 */ | |
f4474d50 | 1006 | kvm_vz_lose_htimer(vcpu); |
c992a4f6 JH |
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); | |
273819a6 JH |
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); | |
d42a008f JH |
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); | |
c992a4f6 JH |
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 | ||
1063 | static 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; | |
3ba731da JH |
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; | |
c992a4f6 JH |
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 | ||
1132 | static 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; | |
1197 | unknown: | |
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 | ||
1210 | static 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) { | |
f4474d50 JH |
1282 | if (val & CAUSEF_DC) { |
1283 | kvm_vz_lose_htimer(vcpu); | |
c992a4f6 | 1284 | kvm_mips_count_disable_cause(vcpu); |
f4474d50 | 1285 | } else { |
c992a4f6 | 1286 | kvm_mips_count_enable_cause(vcpu); |
f4474d50 | 1287 | } |
c992a4f6 JH |
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 | ||
edec9d7b JH |
1336 | static 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 | ||
c992a4f6 JH |
1348 | static 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 | ||
1378 | static 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 | ||
1398 | static 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; | |
edec9d7b | 1433 | er = kvm_trap_vz_handle_ghfc(cause, opc, vcpu); |
c992a4f6 JH |
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 | */ | |
1466 | static 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 | */ | |
1513 | static 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 | ||
1536 | static 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 | ||
1583 | static 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 | ||
1630 | static 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 | ||
dffe042f JH |
1665 | static 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 | ||
4b7de028 JH |
1672 | static 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 | ||
5a2f352f JH |
1678 | static 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 | ||
c992a4f6 JH |
1685 | static 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 | ||
1694 | static 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; | |
edc89260 JH |
1701 | if (cpu_guest_has_badinstr) |
1702 | ++ret; | |
1703 | if (cpu_guest_has_badinstrp) | |
1704 | ++ret; | |
dffe042f JH |
1705 | if (cpu_guest_has_contextconfig) |
1706 | ret += ARRAY_SIZE(kvm_vz_get_one_regs_contextconfig); | |
4b7de028 JH |
1707 | if (cpu_guest_has_segments) |
1708 | ret += ARRAY_SIZE(kvm_vz_get_one_regs_segments); | |
5a2f352f JH |
1709 | if (cpu_guest_has_htw) |
1710 | ret += ARRAY_SIZE(kvm_vz_get_one_regs_htw); | |
d42a008f JH |
1711 | if (cpu_guest_has_maar && !cpu_guest_has_dyn_maar) |
1712 | ret += 1 + ARRAY_SIZE(vcpu->arch.maar); | |
c992a4f6 JH |
1713 | ret += __arch_hweight8(cpu_data[0].guest.kscratch_mask); |
1714 | ||
1715 | return ret; | |
1716 | } | |
1717 | ||
1718 | static 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 | } | |
edc89260 JH |
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 | } | |
dffe042f JH |
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 | } | |
4b7de028 JH |
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 | } | |
5a2f352f JH |
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 | } | |
d42a008f JH |
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 | } | |
c992a4f6 JH |
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 | ||
1790 | static 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 | ||
1806 | static 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 | ||
1822 | static 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; | |
dffe042f JH |
1842 | case KVM_REG_MIPS_CP0_CONTEXTCONFIG: |
1843 | if (!cpu_guest_has_contextconfig) | |
1844 | return -EINVAL; | |
1845 | *v = read_gc0_contextconfig(); | |
1846 | break; | |
c992a4f6 JH |
1847 | case KVM_REG_MIPS_CP0_USERLOCAL: |
1848 | if (!cpu_guest_has_userlocal) | |
1849 | return -EINVAL; | |
1850 | *v = read_gc0_userlocal(); | |
1851 | break; | |
dffe042f JH |
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 | |
c992a4f6 JH |
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; | |
4b7de028 JH |
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; | |
5a2f352f JH |
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; | |
c992a4f6 JH |
1895 | case KVM_REG_MIPS_CP0_WIRED: |
1896 | *v = (long)read_gc0_wired(); | |
1897 | break; | |
5a2f352f JH |
1898 | case KVM_REG_MIPS_CP0_PWCTL: |
1899 | if (!cpu_guest_has_htw) | |
1900 | return -EINVAL; | |
1901 | *v = read_gc0_pwctl(); | |
1902 | break; | |
c992a4f6 JH |
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; | |
edc89260 JH |
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; | |
c992a4f6 JH |
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: | |
1f48f9be JH |
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 | }; | |
c992a4f6 JH |
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; | |
d42a008f JH |
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; | |
c992a4f6 JH |
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 | ||
2043 | static 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; | |
dffe042f JH |
2065 | case KVM_REG_MIPS_CP0_CONTEXTCONFIG: |
2066 | if (!cpu_guest_has_contextconfig) | |
2067 | return -EINVAL; | |
2068 | write_gc0_contextconfig(v); | |
2069 | break; | |
c992a4f6 JH |
2070 | case KVM_REG_MIPS_CP0_USERLOCAL: |
2071 | if (!cpu_guest_has_userlocal) | |
2072 | return -EINVAL; | |
2073 | write_gc0_userlocal(v); | |
2074 | break; | |
dffe042f JH |
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 | |
c992a4f6 JH |
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; | |
4b7de028 JH |
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; | |
5a2f352f JH |
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; | |
c992a4f6 JH |
2118 | case KVM_REG_MIPS_CP0_WIRED: |
2119 | change_gc0_wired(MIPSR6_WIRED_WIRED, v); | |
2120 | break; | |
5a2f352f JH |
2121 | case KVM_REG_MIPS_CP0_PWCTL: |
2122 | if (!cpu_guest_has_htw) | |
2123 | return -EINVAL; | |
2124 | write_gc0_pwctl(v); | |
2125 | break; | |
c992a4f6 JH |
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; | |
edc89260 JH |
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; | |
c992a4f6 JH |
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: | |
1f48f9be JH |
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 | }; | |
c992a4f6 JH |
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; | |
d42a008f JH |
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; | |
c992a4f6 JH |
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) | |
2313 | static 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 */ | |
2335 | static int kvm_vz_check_requests(struct kvm_vcpu *vcpu, int cpu) | |
2336 | { | |
2337 | int ret = 0; | |
2338 | int i; | |
2339 | ||
2340 | if (!vcpu->requests) | |
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 | ||
2362 | static 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 | ||
2395 | static 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 | ||
2403 | static 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 | ||
2464 | static 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 | ||
edec9d7b JH |
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 | ||
c992a4f6 JH |
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); | |
dffe042f JH |
2534 | if (cpu_guest_has_contextconfig) |
2535 | kvm_restore_gc0_contextconfig(cop0); | |
c992a4f6 JH |
2536 | #ifdef CONFIG_64BIT |
2537 | kvm_restore_gc0_xcontext(cop0); | |
dffe042f JH |
2538 | if (cpu_guest_has_contextconfig) |
2539 | kvm_restore_gc0_xcontextconfig(cop0); | |
c992a4f6 JH |
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 | ||
edc89260 JH |
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 | ||
4b7de028 JH |
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 | ||
5a2f352f JH |
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 | ||
c992a4f6 JH |
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 | ||
273819a6 JH |
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 | ||
c992a4f6 JH |
2603 | return 0; |
2604 | } | |
2605 | ||
2606 | static 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); | |
dffe042f JH |
2619 | if (cpu_guest_has_contextconfig) |
2620 | kvm_save_gc0_contextconfig(cop0); | |
c992a4f6 JH |
2621 | #ifdef CONFIG_64BIT |
2622 | kvm_save_gc0_xcontext(cop0); | |
dffe042f JH |
2623 | if (cpu_guest_has_contextconfig) |
2624 | kvm_save_gc0_xcontextconfig(cop0); | |
c992a4f6 JH |
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 | ||
edc89260 JH |
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 | ||
4b7de028 JH |
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 | ||
5a2f352f JH |
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 | ||
c992a4f6 JH |
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 | */ | |
2716 | static 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 | ||
2773 | static int kvm_vz_hardware_enable(void) | |
2774 | { | |
2775 | unsigned int mmu_size, guest_mmu_size, ftlb_size; | |
824533ad JH |
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; | |
c992a4f6 | 2816 | |
824533ad JH |
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(); | |
c992a4f6 | 2821 | |
824533ad JH |
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; | |
c992a4f6 | 2830 | |
824533ad JH |
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 | } | |
c992a4f6 JH |
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 | ||
2877 | static void kvm_vz_hardware_disable(void) | |
2878 | { | |
824533ad JH |
2879 | u64 cvmvmconfig; |
2880 | unsigned int mmu_size; | |
2881 | ||
2882 | /* Flush any remaining guest TLB entries */ | |
c992a4f6 JH |
2883 | kvm_vz_local_flush_guesttlb_all(); |
2884 | ||
824533ad JH |
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 | ||
c992a4f6 JH |
2909 | if (cpu_has_guestid) { |
2910 | write_c0_guestctl1(0); | |
2911 | kvm_vz_local_flush_roottlb_all_guests(); | |
2912 | } | |
2913 | } | |
2914 | ||
2915 | static 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 | ||
2938 | static 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 | ||
2948 | static 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 | ||
2965 | static 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 | ||
dffe042f JH |
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 | ||
4b7de028 JH |
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 | ||
5a2f352f JH |
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 | ||
c992a4f6 JH |
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 | ||
3106 | static 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 | ||
3126 | static 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 | ||
3132 | static 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 | ||
3148 | static int kvm_vz_vcpu_run(struct kvm_run *run, struct kvm_vcpu *vcpu) | |
3149 | { | |
3150 | int cpu = smp_processor_id(); | |
3151 | int r; | |
3152 | ||
f4474d50 | 3153 | kvm_vz_acquire_htimer(vcpu); |
c992a4f6 JH |
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 | ||
3168 | static 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 | ||
3206 | int 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 | } |