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e685c689 | 1 | /* |
d116e812 DCZ |
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: Instruction/Exception emulation | |
7 | * | |
8 | * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. | |
9 | * Authors: Sanjay Lal <sanjayl@kymasys.com> | |
10 | */ | |
e685c689 SL |
11 | |
12 | #include <linux/errno.h> | |
13 | #include <linux/err.h> | |
e30492bb | 14 | #include <linux/ktime.h> |
e685c689 SL |
15 | #include <linux/kvm_host.h> |
16 | #include <linux/module.h> | |
17 | #include <linux/vmalloc.h> | |
18 | #include <linux/fs.h> | |
19 | #include <linux/bootmem.h> | |
20 | #include <linux/random.h> | |
21 | #include <asm/page.h> | |
22 | #include <asm/cacheflush.h> | |
23 | #include <asm/cpu-info.h> | |
24 | #include <asm/mmu_context.h> | |
25 | #include <asm/tlbflush.h> | |
26 | #include <asm/inst.h> | |
27 | ||
28 | #undef CONFIG_MIPS_MT | |
29 | #include <asm/r4kcache.h> | |
30 | #define CONFIG_MIPS_MT | |
31 | ||
d7d5b05f DCZ |
32 | #include "opcode.h" |
33 | #include "interrupt.h" | |
34 | #include "commpage.h" | |
e685c689 SL |
35 | |
36 | #include "trace.h" | |
37 | ||
38 | /* | |
39 | * Compute the return address and do emulate branch simulation, if required. | |
40 | * This function should be called only in branch delay slot active. | |
41 | */ | |
42 | unsigned long kvm_compute_return_epc(struct kvm_vcpu *vcpu, | |
43 | unsigned long instpc) | |
44 | { | |
45 | unsigned int dspcontrol; | |
46 | union mips_instruction insn; | |
47 | struct kvm_vcpu_arch *arch = &vcpu->arch; | |
48 | long epc = instpc; | |
49 | long nextpc = KVM_INVALID_INST; | |
50 | ||
51 | if (epc & 3) | |
52 | goto unaligned; | |
53 | ||
d116e812 | 54 | /* Read the instruction */ |
e685c689 SL |
55 | insn.word = kvm_get_inst((uint32_t *) epc, vcpu); |
56 | ||
57 | if (insn.word == KVM_INVALID_INST) | |
58 | return KVM_INVALID_INST; | |
59 | ||
60 | switch (insn.i_format.opcode) { | |
d116e812 | 61 | /* jr and jalr are in r_format format. */ |
e685c689 SL |
62 | case spec_op: |
63 | switch (insn.r_format.func) { | |
64 | case jalr_op: | |
65 | arch->gprs[insn.r_format.rd] = epc + 8; | |
66 | /* Fall through */ | |
67 | case jr_op: | |
68 | nextpc = arch->gprs[insn.r_format.rs]; | |
69 | break; | |
70 | } | |
71 | break; | |
72 | ||
73 | /* | |
74 | * This group contains: | |
75 | * bltz_op, bgez_op, bltzl_op, bgezl_op, | |
76 | * bltzal_op, bgezal_op, bltzall_op, bgezall_op. | |
77 | */ | |
78 | case bcond_op: | |
79 | switch (insn.i_format.rt) { | |
80 | case bltz_op: | |
81 | case bltzl_op: | |
82 | if ((long)arch->gprs[insn.i_format.rs] < 0) | |
83 | epc = epc + 4 + (insn.i_format.simmediate << 2); | |
84 | else | |
85 | epc += 8; | |
86 | nextpc = epc; | |
87 | break; | |
88 | ||
89 | case bgez_op: | |
90 | case bgezl_op: | |
91 | if ((long)arch->gprs[insn.i_format.rs] >= 0) | |
92 | epc = epc + 4 + (insn.i_format.simmediate << 2); | |
93 | else | |
94 | epc += 8; | |
95 | nextpc = epc; | |
96 | break; | |
97 | ||
98 | case bltzal_op: | |
99 | case bltzall_op: | |
100 | arch->gprs[31] = epc + 8; | |
101 | if ((long)arch->gprs[insn.i_format.rs] < 0) | |
102 | epc = epc + 4 + (insn.i_format.simmediate << 2); | |
103 | else | |
104 | epc += 8; | |
105 | nextpc = epc; | |
106 | break; | |
107 | ||
108 | case bgezal_op: | |
109 | case bgezall_op: | |
110 | arch->gprs[31] = epc + 8; | |
111 | if ((long)arch->gprs[insn.i_format.rs] >= 0) | |
112 | epc = epc + 4 + (insn.i_format.simmediate << 2); | |
113 | else | |
114 | epc += 8; | |
115 | nextpc = epc; | |
116 | break; | |
117 | case bposge32_op: | |
118 | if (!cpu_has_dsp) | |
119 | goto sigill; | |
120 | ||
121 | dspcontrol = rddsp(0x01); | |
122 | ||
d116e812 | 123 | if (dspcontrol >= 32) |
e685c689 | 124 | epc = epc + 4 + (insn.i_format.simmediate << 2); |
d116e812 | 125 | else |
e685c689 SL |
126 | epc += 8; |
127 | nextpc = epc; | |
128 | break; | |
129 | } | |
130 | break; | |
131 | ||
d116e812 | 132 | /* These are unconditional and in j_format. */ |
e685c689 SL |
133 | case jal_op: |
134 | arch->gprs[31] = instpc + 8; | |
135 | case j_op: | |
136 | epc += 4; | |
137 | epc >>= 28; | |
138 | epc <<= 28; | |
139 | epc |= (insn.j_format.target << 2); | |
140 | nextpc = epc; | |
141 | break; | |
142 | ||
d116e812 | 143 | /* These are conditional and in i_format. */ |
e685c689 SL |
144 | case beq_op: |
145 | case beql_op: | |
146 | if (arch->gprs[insn.i_format.rs] == | |
147 | arch->gprs[insn.i_format.rt]) | |
148 | epc = epc + 4 + (insn.i_format.simmediate << 2); | |
149 | else | |
150 | epc += 8; | |
151 | nextpc = epc; | |
152 | break; | |
153 | ||
154 | case bne_op: | |
155 | case bnel_op: | |
156 | if (arch->gprs[insn.i_format.rs] != | |
157 | arch->gprs[insn.i_format.rt]) | |
158 | epc = epc + 4 + (insn.i_format.simmediate << 2); | |
159 | else | |
160 | epc += 8; | |
161 | nextpc = epc; | |
162 | break; | |
163 | ||
164 | case blez_op: /* not really i_format */ | |
165 | case blezl_op: | |
166 | /* rt field assumed to be zero */ | |
167 | if ((long)arch->gprs[insn.i_format.rs] <= 0) | |
168 | epc = epc + 4 + (insn.i_format.simmediate << 2); | |
169 | else | |
170 | epc += 8; | |
171 | nextpc = epc; | |
172 | break; | |
173 | ||
174 | case bgtz_op: | |
175 | case bgtzl_op: | |
176 | /* rt field assumed to be zero */ | |
177 | if ((long)arch->gprs[insn.i_format.rs] > 0) | |
178 | epc = epc + 4 + (insn.i_format.simmediate << 2); | |
179 | else | |
180 | epc += 8; | |
181 | nextpc = epc; | |
182 | break; | |
183 | ||
d116e812 | 184 | /* And now the FPA/cp1 branch instructions. */ |
e685c689 | 185 | case cop1_op: |
6ad78a5c | 186 | kvm_err("%s: unsupported cop1_op\n", __func__); |
e685c689 SL |
187 | break; |
188 | } | |
189 | ||
190 | return nextpc; | |
191 | ||
192 | unaligned: | |
6ad78a5c | 193 | kvm_err("%s: unaligned epc\n", __func__); |
e685c689 SL |
194 | return nextpc; |
195 | ||
196 | sigill: | |
6ad78a5c | 197 | kvm_err("%s: DSP branch but not DSP ASE\n", __func__); |
e685c689 SL |
198 | return nextpc; |
199 | } | |
200 | ||
201 | enum emulation_result update_pc(struct kvm_vcpu *vcpu, uint32_t cause) | |
202 | { | |
203 | unsigned long branch_pc; | |
204 | enum emulation_result er = EMULATE_DONE; | |
205 | ||
206 | if (cause & CAUSEF_BD) { | |
207 | branch_pc = kvm_compute_return_epc(vcpu, vcpu->arch.pc); | |
208 | if (branch_pc == KVM_INVALID_INST) { | |
209 | er = EMULATE_FAIL; | |
210 | } else { | |
211 | vcpu->arch.pc = branch_pc; | |
d116e812 DCZ |
212 | kvm_debug("BD update_pc(): New PC: %#lx\n", |
213 | vcpu->arch.pc); | |
e685c689 SL |
214 | } |
215 | } else | |
216 | vcpu->arch.pc += 4; | |
217 | ||
218 | kvm_debug("update_pc(): New PC: %#lx\n", vcpu->arch.pc); | |
219 | ||
220 | return er; | |
221 | } | |
222 | ||
e30492bb JH |
223 | /** |
224 | * kvm_mips_count_disabled() - Find whether the CP0_Count timer is disabled. | |
225 | * @vcpu: Virtual CPU. | |
e685c689 | 226 | * |
f8239342 JH |
227 | * Returns: 1 if the CP0_Count timer is disabled by either the guest |
228 | * CP0_Cause.DC bit or the count_ctl.DC bit. | |
e30492bb | 229 | * 0 otherwise (in which case CP0_Count timer is running). |
e685c689 | 230 | */ |
e30492bb | 231 | static inline int kvm_mips_count_disabled(struct kvm_vcpu *vcpu) |
e685c689 SL |
232 | { |
233 | struct mips_coproc *cop0 = vcpu->arch.cop0; | |
d116e812 | 234 | |
f8239342 JH |
235 | return (vcpu->arch.count_ctl & KVM_REG_MIPS_COUNT_CTL_DC) || |
236 | (kvm_read_c0_guest_cause(cop0) & CAUSEF_DC); | |
e30492bb | 237 | } |
e685c689 | 238 | |
e30492bb JH |
239 | /** |
240 | * kvm_mips_ktime_to_count() - Scale ktime_t to a 32-bit count. | |
241 | * | |
242 | * Caches the dynamic nanosecond bias in vcpu->arch.count_dyn_bias. | |
243 | * | |
244 | * Assumes !kvm_mips_count_disabled(@vcpu) (guest CP0_Count timer is running). | |
245 | */ | |
246 | static uint32_t kvm_mips_ktime_to_count(struct kvm_vcpu *vcpu, ktime_t now) | |
247 | { | |
248 | s64 now_ns, periods; | |
249 | u64 delta; | |
250 | ||
251 | now_ns = ktime_to_ns(now); | |
252 | delta = now_ns + vcpu->arch.count_dyn_bias; | |
253 | ||
254 | if (delta >= vcpu->arch.count_period) { | |
255 | /* If delta is out of safe range the bias needs adjusting */ | |
256 | periods = div64_s64(now_ns, vcpu->arch.count_period); | |
257 | vcpu->arch.count_dyn_bias = -periods * vcpu->arch.count_period; | |
258 | /* Recalculate delta with new bias */ | |
259 | delta = now_ns + vcpu->arch.count_dyn_bias; | |
e685c689 SL |
260 | } |
261 | ||
e30492bb JH |
262 | /* |
263 | * We've ensured that: | |
264 | * delta < count_period | |
265 | * | |
266 | * Therefore the intermediate delta*count_hz will never overflow since | |
267 | * at the boundary condition: | |
268 | * delta = count_period | |
269 | * delta = NSEC_PER_SEC * 2^32 / count_hz | |
270 | * delta * count_hz = NSEC_PER_SEC * 2^32 | |
271 | */ | |
272 | return div_u64(delta * vcpu->arch.count_hz, NSEC_PER_SEC); | |
273 | } | |
274 | ||
f8239342 JH |
275 | /** |
276 | * kvm_mips_count_time() - Get effective current time. | |
277 | * @vcpu: Virtual CPU. | |
278 | * | |
279 | * Get effective monotonic ktime. This is usually a straightforward ktime_get(), | |
280 | * except when the master disable bit is set in count_ctl, in which case it is | |
281 | * count_resume, i.e. the time that the count was disabled. | |
282 | * | |
283 | * Returns: Effective monotonic ktime for CP0_Count. | |
284 | */ | |
285 | static inline ktime_t kvm_mips_count_time(struct kvm_vcpu *vcpu) | |
286 | { | |
287 | if (unlikely(vcpu->arch.count_ctl & KVM_REG_MIPS_COUNT_CTL_DC)) | |
288 | return vcpu->arch.count_resume; | |
289 | ||
290 | return ktime_get(); | |
291 | } | |
292 | ||
e30492bb JH |
293 | /** |
294 | * kvm_mips_read_count_running() - Read the current count value as if running. | |
295 | * @vcpu: Virtual CPU. | |
296 | * @now: Kernel time to read CP0_Count at. | |
297 | * | |
298 | * Returns the current guest CP0_Count register at time @now and handles if the | |
299 | * timer interrupt is pending and hasn't been handled yet. | |
300 | * | |
301 | * Returns: The current value of the guest CP0_Count register. | |
302 | */ | |
303 | static uint32_t kvm_mips_read_count_running(struct kvm_vcpu *vcpu, ktime_t now) | |
304 | { | |
305 | ktime_t expires; | |
306 | int running; | |
307 | ||
308 | /* Is the hrtimer pending? */ | |
309 | expires = hrtimer_get_expires(&vcpu->arch.comparecount_timer); | |
310 | if (ktime_compare(now, expires) >= 0) { | |
311 | /* | |
312 | * Cancel it while we handle it so there's no chance of | |
313 | * interference with the timeout handler. | |
314 | */ | |
315 | running = hrtimer_cancel(&vcpu->arch.comparecount_timer); | |
316 | ||
317 | /* Nothing should be waiting on the timeout */ | |
318 | kvm_mips_callbacks->queue_timer_int(vcpu); | |
319 | ||
320 | /* | |
321 | * Restart the timer if it was running based on the expiry time | |
322 | * we read, so that we don't push it back 2 periods. | |
323 | */ | |
324 | if (running) { | |
325 | expires = ktime_add_ns(expires, | |
326 | vcpu->arch.count_period); | |
327 | hrtimer_start(&vcpu->arch.comparecount_timer, expires, | |
328 | HRTIMER_MODE_ABS); | |
329 | } | |
330 | } | |
331 | ||
332 | /* Return the biased and scaled guest CP0_Count */ | |
333 | return vcpu->arch.count_bias + kvm_mips_ktime_to_count(vcpu, now); | |
334 | } | |
335 | ||
336 | /** | |
337 | * kvm_mips_read_count() - Read the current count value. | |
338 | * @vcpu: Virtual CPU. | |
339 | * | |
340 | * Read the current guest CP0_Count value, taking into account whether the timer | |
341 | * is stopped. | |
342 | * | |
343 | * Returns: The current guest CP0_Count value. | |
344 | */ | |
345 | uint32_t kvm_mips_read_count(struct kvm_vcpu *vcpu) | |
346 | { | |
347 | struct mips_coproc *cop0 = vcpu->arch.cop0; | |
348 | ||
349 | /* If count disabled just read static copy of count */ | |
350 | if (kvm_mips_count_disabled(vcpu)) | |
351 | return kvm_read_c0_guest_count(cop0); | |
352 | ||
353 | return kvm_mips_read_count_running(vcpu, ktime_get()); | |
354 | } | |
355 | ||
356 | /** | |
357 | * kvm_mips_freeze_hrtimer() - Safely stop the hrtimer. | |
358 | * @vcpu: Virtual CPU. | |
359 | * @count: Output pointer for CP0_Count value at point of freeze. | |
360 | * | |
361 | * Freeze the hrtimer safely and return both the ktime and the CP0_Count value | |
362 | * at the point it was frozen. It is guaranteed that any pending interrupts at | |
363 | * the point it was frozen are handled, and none after that point. | |
364 | * | |
365 | * This is useful where the time/CP0_Count is needed in the calculation of the | |
366 | * new parameters. | |
367 | * | |
368 | * Assumes !kvm_mips_count_disabled(@vcpu) (guest CP0_Count timer is running). | |
369 | * | |
370 | * Returns: The ktime at the point of freeze. | |
371 | */ | |
372 | static ktime_t kvm_mips_freeze_hrtimer(struct kvm_vcpu *vcpu, | |
373 | uint32_t *count) | |
374 | { | |
375 | ktime_t now; | |
376 | ||
377 | /* stop hrtimer before finding time */ | |
378 | hrtimer_cancel(&vcpu->arch.comparecount_timer); | |
379 | now = ktime_get(); | |
380 | ||
381 | /* find count at this point and handle pending hrtimer */ | |
382 | *count = kvm_mips_read_count_running(vcpu, now); | |
383 | ||
384 | return now; | |
385 | } | |
386 | ||
e30492bb JH |
387 | /** |
388 | * kvm_mips_resume_hrtimer() - Resume hrtimer, updating expiry. | |
389 | * @vcpu: Virtual CPU. | |
390 | * @now: ktime at point of resume. | |
391 | * @count: CP0_Count at point of resume. | |
392 | * | |
393 | * Resumes the timer and updates the timer expiry based on @now and @count. | |
394 | * This can be used in conjunction with kvm_mips_freeze_timer() when timer | |
395 | * parameters need to be changed. | |
396 | * | |
397 | * It is guaranteed that a timer interrupt immediately after resume will be | |
398 | * handled, but not if CP_Compare is exactly at @count. That case is already | |
399 | * handled by kvm_mips_freeze_timer(). | |
400 | * | |
401 | * Assumes !kvm_mips_count_disabled(@vcpu) (guest CP0_Count timer is running). | |
402 | */ | |
403 | static void kvm_mips_resume_hrtimer(struct kvm_vcpu *vcpu, | |
404 | ktime_t now, uint32_t count) | |
405 | { | |
406 | struct mips_coproc *cop0 = vcpu->arch.cop0; | |
407 | uint32_t compare; | |
408 | u64 delta; | |
409 | ktime_t expire; | |
410 | ||
411 | /* Calculate timeout (wrap 0 to 2^32) */ | |
412 | compare = kvm_read_c0_guest_compare(cop0); | |
413 | delta = (u64)(uint32_t)(compare - count - 1) + 1; | |
414 | delta = div_u64(delta * NSEC_PER_SEC, vcpu->arch.count_hz); | |
415 | expire = ktime_add_ns(now, delta); | |
416 | ||
417 | /* Update hrtimer to use new timeout */ | |
418 | hrtimer_cancel(&vcpu->arch.comparecount_timer); | |
419 | hrtimer_start(&vcpu->arch.comparecount_timer, expire, HRTIMER_MODE_ABS); | |
420 | } | |
421 | ||
422 | /** | |
423 | * kvm_mips_update_hrtimer() - Update next expiry time of hrtimer. | |
424 | * @vcpu: Virtual CPU. | |
425 | * | |
426 | * Recalculates and updates the expiry time of the hrtimer. This can be used | |
427 | * after timer parameters have been altered which do not depend on the time that | |
428 | * the change occurs (in those cases kvm_mips_freeze_hrtimer() and | |
429 | * kvm_mips_resume_hrtimer() are used directly). | |
430 | * | |
431 | * It is guaranteed that no timer interrupts will be lost in the process. | |
432 | * | |
433 | * Assumes !kvm_mips_count_disabled(@vcpu) (guest CP0_Count timer is running). | |
434 | */ | |
435 | static void kvm_mips_update_hrtimer(struct kvm_vcpu *vcpu) | |
436 | { | |
437 | ktime_t now; | |
438 | uint32_t count; | |
439 | ||
440 | /* | |
441 | * freeze_hrtimer takes care of a timer interrupts <= count, and | |
442 | * resume_hrtimer the hrtimer takes care of a timer interrupts > count. | |
443 | */ | |
444 | now = kvm_mips_freeze_hrtimer(vcpu, &count); | |
445 | kvm_mips_resume_hrtimer(vcpu, now, count); | |
446 | } | |
447 | ||
448 | /** | |
449 | * kvm_mips_write_count() - Modify the count and update timer. | |
450 | * @vcpu: Virtual CPU. | |
451 | * @count: Guest CP0_Count value to set. | |
452 | * | |
453 | * Sets the CP0_Count value and updates the timer accordingly. | |
454 | */ | |
455 | void kvm_mips_write_count(struct kvm_vcpu *vcpu, uint32_t count) | |
456 | { | |
457 | struct mips_coproc *cop0 = vcpu->arch.cop0; | |
458 | ktime_t now; | |
459 | ||
460 | /* Calculate bias */ | |
f8239342 | 461 | now = kvm_mips_count_time(vcpu); |
e30492bb JH |
462 | vcpu->arch.count_bias = count - kvm_mips_ktime_to_count(vcpu, now); |
463 | ||
464 | if (kvm_mips_count_disabled(vcpu)) | |
465 | /* The timer's disabled, adjust the static count */ | |
466 | kvm_write_c0_guest_count(cop0, count); | |
467 | else | |
468 | /* Update timeout */ | |
469 | kvm_mips_resume_hrtimer(vcpu, now, count); | |
470 | } | |
471 | ||
472 | /** | |
473 | * kvm_mips_init_count() - Initialise timer. | |
474 | * @vcpu: Virtual CPU. | |
475 | * | |
476 | * Initialise the timer to a sensible frequency, namely 100MHz, zero it, and set | |
477 | * it going if it's enabled. | |
478 | */ | |
479 | void kvm_mips_init_count(struct kvm_vcpu *vcpu) | |
480 | { | |
481 | /* 100 MHz */ | |
482 | vcpu->arch.count_hz = 100*1000*1000; | |
483 | vcpu->arch.count_period = div_u64((u64)NSEC_PER_SEC << 32, | |
484 | vcpu->arch.count_hz); | |
485 | vcpu->arch.count_dyn_bias = 0; | |
486 | ||
487 | /* Starting at 0 */ | |
488 | kvm_mips_write_count(vcpu, 0); | |
489 | } | |
490 | ||
f74a8e22 JH |
491 | /** |
492 | * kvm_mips_set_count_hz() - Update the frequency of the timer. | |
493 | * @vcpu: Virtual CPU. | |
494 | * @count_hz: Frequency of CP0_Count timer in Hz. | |
495 | * | |
496 | * Change the frequency of the CP0_Count timer. This is done atomically so that | |
497 | * CP0_Count is continuous and no timer interrupt is lost. | |
498 | * | |
499 | * Returns: -EINVAL if @count_hz is out of range. | |
500 | * 0 on success. | |
501 | */ | |
502 | int kvm_mips_set_count_hz(struct kvm_vcpu *vcpu, s64 count_hz) | |
503 | { | |
504 | struct mips_coproc *cop0 = vcpu->arch.cop0; | |
505 | int dc; | |
506 | ktime_t now; | |
507 | u32 count; | |
508 | ||
509 | /* ensure the frequency is in a sensible range... */ | |
510 | if (count_hz <= 0 || count_hz > NSEC_PER_SEC) | |
511 | return -EINVAL; | |
512 | /* ... and has actually changed */ | |
513 | if (vcpu->arch.count_hz == count_hz) | |
514 | return 0; | |
515 | ||
516 | /* Safely freeze timer so we can keep it continuous */ | |
517 | dc = kvm_mips_count_disabled(vcpu); | |
518 | if (dc) { | |
519 | now = kvm_mips_count_time(vcpu); | |
520 | count = kvm_read_c0_guest_count(cop0); | |
521 | } else { | |
522 | now = kvm_mips_freeze_hrtimer(vcpu, &count); | |
523 | } | |
524 | ||
525 | /* Update the frequency */ | |
526 | vcpu->arch.count_hz = count_hz; | |
527 | vcpu->arch.count_period = div_u64((u64)NSEC_PER_SEC << 32, count_hz); | |
528 | vcpu->arch.count_dyn_bias = 0; | |
529 | ||
530 | /* Calculate adjusted bias so dynamic count is unchanged */ | |
531 | vcpu->arch.count_bias = count - kvm_mips_ktime_to_count(vcpu, now); | |
532 | ||
533 | /* Update and resume hrtimer */ | |
534 | if (!dc) | |
535 | kvm_mips_resume_hrtimer(vcpu, now, count); | |
536 | return 0; | |
537 | } | |
538 | ||
e30492bb JH |
539 | /** |
540 | * kvm_mips_write_compare() - Modify compare and update timer. | |
541 | * @vcpu: Virtual CPU. | |
542 | * @compare: New CP0_Compare value. | |
543 | * | |
544 | * Update CP0_Compare to a new value and update the timeout. | |
545 | */ | |
546 | void kvm_mips_write_compare(struct kvm_vcpu *vcpu, uint32_t compare) | |
547 | { | |
548 | struct mips_coproc *cop0 = vcpu->arch.cop0; | |
549 | ||
550 | /* if unchanged, must just be an ack */ | |
551 | if (kvm_read_c0_guest_compare(cop0) == compare) | |
552 | return; | |
553 | ||
554 | /* Update compare */ | |
555 | kvm_write_c0_guest_compare(cop0, compare); | |
556 | ||
557 | /* Update timeout if count enabled */ | |
558 | if (!kvm_mips_count_disabled(vcpu)) | |
559 | kvm_mips_update_hrtimer(vcpu); | |
560 | } | |
561 | ||
562 | /** | |
563 | * kvm_mips_count_disable() - Disable count. | |
564 | * @vcpu: Virtual CPU. | |
565 | * | |
566 | * Disable the CP0_Count timer. A timer interrupt on or before the final stop | |
567 | * time will be handled but not after. | |
568 | * | |
f8239342 JH |
569 | * Assumes CP0_Count was previously enabled but now Guest.CP0_Cause.DC or |
570 | * count_ctl.DC has been set (count disabled). | |
e30492bb JH |
571 | * |
572 | * Returns: The time that the timer was stopped. | |
573 | */ | |
574 | static ktime_t kvm_mips_count_disable(struct kvm_vcpu *vcpu) | |
575 | { | |
576 | struct mips_coproc *cop0 = vcpu->arch.cop0; | |
577 | uint32_t count; | |
578 | ktime_t now; | |
579 | ||
580 | /* Stop hrtimer */ | |
581 | hrtimer_cancel(&vcpu->arch.comparecount_timer); | |
582 | ||
583 | /* Set the static count from the dynamic count, handling pending TI */ | |
584 | now = ktime_get(); | |
585 | count = kvm_mips_read_count_running(vcpu, now); | |
586 | kvm_write_c0_guest_count(cop0, count); | |
587 | ||
588 | return now; | |
589 | } | |
590 | ||
591 | /** | |
592 | * kvm_mips_count_disable_cause() - Disable count using CP0_Cause.DC. | |
593 | * @vcpu: Virtual CPU. | |
594 | * | |
595 | * Disable the CP0_Count timer and set CP0_Cause.DC. A timer interrupt on or | |
f8239342 JH |
596 | * before the final stop time will be handled if the timer isn't disabled by |
597 | * count_ctl.DC, but not after. | |
e30492bb JH |
598 | * |
599 | * Assumes CP0_Cause.DC is clear (count enabled). | |
600 | */ | |
601 | void kvm_mips_count_disable_cause(struct kvm_vcpu *vcpu) | |
602 | { | |
603 | struct mips_coproc *cop0 = vcpu->arch.cop0; | |
604 | ||
605 | kvm_set_c0_guest_cause(cop0, CAUSEF_DC); | |
f8239342 JH |
606 | if (!(vcpu->arch.count_ctl & KVM_REG_MIPS_COUNT_CTL_DC)) |
607 | kvm_mips_count_disable(vcpu); | |
e30492bb JH |
608 | } |
609 | ||
610 | /** | |
611 | * kvm_mips_count_enable_cause() - Enable count using CP0_Cause.DC. | |
612 | * @vcpu: Virtual CPU. | |
613 | * | |
614 | * Enable the CP0_Count timer and clear CP0_Cause.DC. A timer interrupt after | |
f8239342 JH |
615 | * the start time will be handled if the timer isn't disabled by count_ctl.DC, |
616 | * potentially before even returning, so the caller should be careful with | |
617 | * ordering of CP0_Cause modifications so as not to lose it. | |
e30492bb JH |
618 | * |
619 | * Assumes CP0_Cause.DC is set (count disabled). | |
620 | */ | |
621 | void kvm_mips_count_enable_cause(struct kvm_vcpu *vcpu) | |
622 | { | |
623 | struct mips_coproc *cop0 = vcpu->arch.cop0; | |
624 | uint32_t count; | |
625 | ||
626 | kvm_clear_c0_guest_cause(cop0, CAUSEF_DC); | |
627 | ||
628 | /* | |
629 | * Set the dynamic count to match the static count. | |
f8239342 JH |
630 | * This starts the hrtimer if count_ctl.DC allows it. |
631 | * Otherwise it conveniently updates the biases. | |
e30492bb JH |
632 | */ |
633 | count = kvm_read_c0_guest_count(cop0); | |
634 | kvm_mips_write_count(vcpu, count); | |
635 | } | |
636 | ||
f8239342 JH |
637 | /** |
638 | * kvm_mips_set_count_ctl() - Update the count control KVM register. | |
639 | * @vcpu: Virtual CPU. | |
640 | * @count_ctl: Count control register new value. | |
641 | * | |
642 | * Set the count control KVM register. The timer is updated accordingly. | |
643 | * | |
644 | * Returns: -EINVAL if reserved bits are set. | |
645 | * 0 on success. | |
646 | */ | |
647 | int kvm_mips_set_count_ctl(struct kvm_vcpu *vcpu, s64 count_ctl) | |
648 | { | |
649 | struct mips_coproc *cop0 = vcpu->arch.cop0; | |
650 | s64 changed = count_ctl ^ vcpu->arch.count_ctl; | |
651 | s64 delta; | |
652 | ktime_t expire, now; | |
653 | uint32_t count, compare; | |
654 | ||
655 | /* Only allow defined bits to be changed */ | |
656 | if (changed & ~(s64)(KVM_REG_MIPS_COUNT_CTL_DC)) | |
657 | return -EINVAL; | |
658 | ||
659 | /* Apply new value */ | |
660 | vcpu->arch.count_ctl = count_ctl; | |
661 | ||
662 | /* Master CP0_Count disable */ | |
663 | if (changed & KVM_REG_MIPS_COUNT_CTL_DC) { | |
664 | /* Is CP0_Cause.DC already disabling CP0_Count? */ | |
665 | if (kvm_read_c0_guest_cause(cop0) & CAUSEF_DC) { | |
666 | if (count_ctl & KVM_REG_MIPS_COUNT_CTL_DC) | |
667 | /* Just record the current time */ | |
668 | vcpu->arch.count_resume = ktime_get(); | |
669 | } else if (count_ctl & KVM_REG_MIPS_COUNT_CTL_DC) { | |
670 | /* disable timer and record current time */ | |
671 | vcpu->arch.count_resume = kvm_mips_count_disable(vcpu); | |
672 | } else { | |
673 | /* | |
674 | * Calculate timeout relative to static count at resume | |
675 | * time (wrap 0 to 2^32). | |
676 | */ | |
677 | count = kvm_read_c0_guest_count(cop0); | |
678 | compare = kvm_read_c0_guest_compare(cop0); | |
679 | delta = (u64)(uint32_t)(compare - count - 1) + 1; | |
680 | delta = div_u64(delta * NSEC_PER_SEC, | |
681 | vcpu->arch.count_hz); | |
682 | expire = ktime_add_ns(vcpu->arch.count_resume, delta); | |
683 | ||
684 | /* Handle pending interrupt */ | |
685 | now = ktime_get(); | |
686 | if (ktime_compare(now, expire) >= 0) | |
687 | /* Nothing should be waiting on the timeout */ | |
688 | kvm_mips_callbacks->queue_timer_int(vcpu); | |
689 | ||
690 | /* Resume hrtimer without changing bias */ | |
691 | count = kvm_mips_read_count_running(vcpu, now); | |
692 | kvm_mips_resume_hrtimer(vcpu, now, count); | |
693 | } | |
694 | } | |
695 | ||
696 | return 0; | |
697 | } | |
698 | ||
699 | /** | |
700 | * kvm_mips_set_count_resume() - Update the count resume KVM register. | |
701 | * @vcpu: Virtual CPU. | |
702 | * @count_resume: Count resume register new value. | |
703 | * | |
704 | * Set the count resume KVM register. | |
705 | * | |
706 | * Returns: -EINVAL if out of valid range (0..now). | |
707 | * 0 on success. | |
708 | */ | |
709 | int kvm_mips_set_count_resume(struct kvm_vcpu *vcpu, s64 count_resume) | |
710 | { | |
711 | /* | |
712 | * It doesn't make sense for the resume time to be in the future, as it | |
713 | * would be possible for the next interrupt to be more than a full | |
714 | * period in the future. | |
715 | */ | |
716 | if (count_resume < 0 || count_resume > ktime_to_ns(ktime_get())) | |
717 | return -EINVAL; | |
718 | ||
719 | vcpu->arch.count_resume = ns_to_ktime(count_resume); | |
720 | return 0; | |
721 | } | |
722 | ||
e30492bb JH |
723 | /** |
724 | * kvm_mips_count_timeout() - Push timer forward on timeout. | |
725 | * @vcpu: Virtual CPU. | |
726 | * | |
727 | * Handle an hrtimer event by push the hrtimer forward a period. | |
728 | * | |
729 | * Returns: The hrtimer_restart value to return to the hrtimer subsystem. | |
730 | */ | |
731 | enum hrtimer_restart kvm_mips_count_timeout(struct kvm_vcpu *vcpu) | |
732 | { | |
733 | /* Add the Count period to the current expiry time */ | |
734 | hrtimer_add_expires_ns(&vcpu->arch.comparecount_timer, | |
735 | vcpu->arch.count_period); | |
736 | return HRTIMER_RESTART; | |
e685c689 SL |
737 | } |
738 | ||
739 | enum emulation_result kvm_mips_emul_eret(struct kvm_vcpu *vcpu) | |
740 | { | |
741 | struct mips_coproc *cop0 = vcpu->arch.cop0; | |
742 | enum emulation_result er = EMULATE_DONE; | |
743 | ||
744 | if (kvm_read_c0_guest_status(cop0) & ST0_EXL) { | |
745 | kvm_debug("[%#lx] ERET to %#lx\n", vcpu->arch.pc, | |
746 | kvm_read_c0_guest_epc(cop0)); | |
747 | kvm_clear_c0_guest_status(cop0, ST0_EXL); | |
748 | vcpu->arch.pc = kvm_read_c0_guest_epc(cop0); | |
749 | ||
750 | } else if (kvm_read_c0_guest_status(cop0) & ST0_ERL) { | |
751 | kvm_clear_c0_guest_status(cop0, ST0_ERL); | |
752 | vcpu->arch.pc = kvm_read_c0_guest_errorepc(cop0); | |
753 | } else { | |
6ad78a5c DCZ |
754 | kvm_err("[%#lx] ERET when MIPS_SR_EXL|MIPS_SR_ERL == 0\n", |
755 | vcpu->arch.pc); | |
e685c689 SL |
756 | er = EMULATE_FAIL; |
757 | } | |
758 | ||
759 | return er; | |
760 | } | |
761 | ||
762 | enum emulation_result kvm_mips_emul_wait(struct kvm_vcpu *vcpu) | |
763 | { | |
e685c689 SL |
764 | kvm_debug("[%#lx] !!!WAIT!!! (%#lx)\n", vcpu->arch.pc, |
765 | vcpu->arch.pending_exceptions); | |
766 | ||
767 | ++vcpu->stat.wait_exits; | |
768 | trace_kvm_exit(vcpu, WAIT_EXITS); | |
769 | if (!vcpu->arch.pending_exceptions) { | |
770 | vcpu->arch.wait = 1; | |
771 | kvm_vcpu_block(vcpu); | |
772 | ||
d116e812 DCZ |
773 | /* |
774 | * We we are runnable, then definitely go off to user space to | |
775 | * check if any I/O interrupts are pending. | |
e685c689 SL |
776 | */ |
777 | if (kvm_check_request(KVM_REQ_UNHALT, vcpu)) { | |
778 | clear_bit(KVM_REQ_UNHALT, &vcpu->requests); | |
779 | vcpu->run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN; | |
780 | } | |
781 | } | |
782 | ||
d98403a5 | 783 | return EMULATE_DONE; |
e685c689 SL |
784 | } |
785 | ||
d116e812 DCZ |
786 | /* |
787 | * XXXKYMA: Linux doesn't seem to use TLBR, return EMULATE_FAIL for now so that | |
788 | * we can catch this, if things ever change | |
e685c689 SL |
789 | */ |
790 | enum emulation_result kvm_mips_emul_tlbr(struct kvm_vcpu *vcpu) | |
791 | { | |
792 | struct mips_coproc *cop0 = vcpu->arch.cop0; | |
e685c689 SL |
793 | uint32_t pc = vcpu->arch.pc; |
794 | ||
6ad78a5c | 795 | kvm_err("[%#x] COP0_TLBR [%ld]\n", pc, kvm_read_c0_guest_index(cop0)); |
d98403a5 | 796 | return EMULATE_FAIL; |
e685c689 SL |
797 | } |
798 | ||
799 | /* Write Guest TLB Entry @ Index */ | |
800 | enum emulation_result kvm_mips_emul_tlbwi(struct kvm_vcpu *vcpu) | |
801 | { | |
802 | struct mips_coproc *cop0 = vcpu->arch.cop0; | |
803 | int index = kvm_read_c0_guest_index(cop0); | |
e685c689 SL |
804 | struct kvm_mips_tlb *tlb = NULL; |
805 | uint32_t pc = vcpu->arch.pc; | |
806 | ||
807 | if (index < 0 || index >= KVM_MIPS_GUEST_TLB_SIZE) { | |
6ad78a5c DCZ |
808 | kvm_debug("%s: illegal index: %d\n", __func__, index); |
809 | kvm_debug("[%#x] COP0_TLBWI [%d] (entryhi: %#lx, entrylo0: %#lx entrylo1: %#lx, mask: %#lx)\n", | |
810 | pc, index, kvm_read_c0_guest_entryhi(cop0), | |
811 | kvm_read_c0_guest_entrylo0(cop0), | |
812 | kvm_read_c0_guest_entrylo1(cop0), | |
813 | kvm_read_c0_guest_pagemask(cop0)); | |
e685c689 SL |
814 | index = (index & ~0x80000000) % KVM_MIPS_GUEST_TLB_SIZE; |
815 | } | |
816 | ||
817 | tlb = &vcpu->arch.guest_tlb[index]; | |
d116e812 DCZ |
818 | /* |
819 | * Probe the shadow host TLB for the entry being overwritten, if one | |
820 | * matches, invalidate it | |
821 | */ | |
e685c689 | 822 | kvm_mips_host_tlb_inv(vcpu, tlb->tlb_hi); |
e685c689 SL |
823 | |
824 | tlb->tlb_mask = kvm_read_c0_guest_pagemask(cop0); | |
825 | tlb->tlb_hi = kvm_read_c0_guest_entryhi(cop0); | |
826 | tlb->tlb_lo0 = kvm_read_c0_guest_entrylo0(cop0); | |
827 | tlb->tlb_lo1 = kvm_read_c0_guest_entrylo1(cop0); | |
828 | ||
d116e812 DCZ |
829 | kvm_debug("[%#x] COP0_TLBWI [%d] (entryhi: %#lx, entrylo0: %#lx entrylo1: %#lx, mask: %#lx)\n", |
830 | pc, index, kvm_read_c0_guest_entryhi(cop0), | |
831 | kvm_read_c0_guest_entrylo0(cop0), | |
832 | kvm_read_c0_guest_entrylo1(cop0), | |
833 | kvm_read_c0_guest_pagemask(cop0)); | |
e685c689 | 834 | |
d98403a5 | 835 | return EMULATE_DONE; |
e685c689 SL |
836 | } |
837 | ||
838 | /* Write Guest TLB Entry @ Random Index */ | |
839 | enum emulation_result kvm_mips_emul_tlbwr(struct kvm_vcpu *vcpu) | |
840 | { | |
841 | struct mips_coproc *cop0 = vcpu->arch.cop0; | |
e685c689 SL |
842 | struct kvm_mips_tlb *tlb = NULL; |
843 | uint32_t pc = vcpu->arch.pc; | |
844 | int index; | |
845 | ||
e685c689 SL |
846 | get_random_bytes(&index, sizeof(index)); |
847 | index &= (KVM_MIPS_GUEST_TLB_SIZE - 1); | |
e685c689 | 848 | |
e685c689 SL |
849 | tlb = &vcpu->arch.guest_tlb[index]; |
850 | ||
d116e812 DCZ |
851 | /* |
852 | * Probe the shadow host TLB for the entry being overwritten, if one | |
853 | * matches, invalidate it | |
854 | */ | |
e685c689 | 855 | kvm_mips_host_tlb_inv(vcpu, tlb->tlb_hi); |
e685c689 SL |
856 | |
857 | tlb->tlb_mask = kvm_read_c0_guest_pagemask(cop0); | |
858 | tlb->tlb_hi = kvm_read_c0_guest_entryhi(cop0); | |
859 | tlb->tlb_lo0 = kvm_read_c0_guest_entrylo0(cop0); | |
860 | tlb->tlb_lo1 = kvm_read_c0_guest_entrylo1(cop0); | |
861 | ||
d116e812 DCZ |
862 | kvm_debug("[%#x] COP0_TLBWR[%d] (entryhi: %#lx, entrylo0: %#lx entrylo1: %#lx)\n", |
863 | pc, index, kvm_read_c0_guest_entryhi(cop0), | |
864 | kvm_read_c0_guest_entrylo0(cop0), | |
865 | kvm_read_c0_guest_entrylo1(cop0)); | |
e685c689 | 866 | |
d98403a5 | 867 | return EMULATE_DONE; |
e685c689 SL |
868 | } |
869 | ||
870 | enum emulation_result kvm_mips_emul_tlbp(struct kvm_vcpu *vcpu) | |
871 | { | |
872 | struct mips_coproc *cop0 = vcpu->arch.cop0; | |
873 | long entryhi = kvm_read_c0_guest_entryhi(cop0); | |
e685c689 SL |
874 | uint32_t pc = vcpu->arch.pc; |
875 | int index = -1; | |
876 | ||
877 | index = kvm_mips_guest_tlb_lookup(vcpu, entryhi); | |
878 | ||
879 | kvm_write_c0_guest_index(cop0, index); | |
880 | ||
881 | kvm_debug("[%#x] COP0_TLBP (entryhi: %#lx), index: %d\n", pc, entryhi, | |
882 | index); | |
883 | ||
d98403a5 | 884 | return EMULATE_DONE; |
e685c689 SL |
885 | } |
886 | ||
d116e812 DCZ |
887 | enum emulation_result kvm_mips_emulate_CP0(uint32_t inst, uint32_t *opc, |
888 | uint32_t cause, struct kvm_run *run, | |
889 | struct kvm_vcpu *vcpu) | |
e685c689 SL |
890 | { |
891 | struct mips_coproc *cop0 = vcpu->arch.cop0; | |
892 | enum emulation_result er = EMULATE_DONE; | |
893 | int32_t rt, rd, copz, sel, co_bit, op; | |
894 | uint32_t pc = vcpu->arch.pc; | |
895 | unsigned long curr_pc; | |
896 | ||
897 | /* | |
898 | * Update PC and hold onto current PC in case there is | |
899 | * an error and we want to rollback the PC | |
900 | */ | |
901 | curr_pc = vcpu->arch.pc; | |
902 | er = update_pc(vcpu, cause); | |
d116e812 | 903 | if (er == EMULATE_FAIL) |
e685c689 | 904 | return er; |
e685c689 SL |
905 | |
906 | copz = (inst >> 21) & 0x1f; | |
907 | rt = (inst >> 16) & 0x1f; | |
908 | rd = (inst >> 11) & 0x1f; | |
909 | sel = inst & 0x7; | |
910 | co_bit = (inst >> 25) & 1; | |
911 | ||
e685c689 SL |
912 | if (co_bit) { |
913 | op = (inst) & 0xff; | |
914 | ||
915 | switch (op) { | |
916 | case tlbr_op: /* Read indexed TLB entry */ | |
917 | er = kvm_mips_emul_tlbr(vcpu); | |
918 | break; | |
919 | case tlbwi_op: /* Write indexed */ | |
920 | er = kvm_mips_emul_tlbwi(vcpu); | |
921 | break; | |
922 | case tlbwr_op: /* Write random */ | |
923 | er = kvm_mips_emul_tlbwr(vcpu); | |
924 | break; | |
925 | case tlbp_op: /* TLB Probe */ | |
926 | er = kvm_mips_emul_tlbp(vcpu); | |
927 | break; | |
928 | case rfe_op: | |
6ad78a5c | 929 | kvm_err("!!!COP0_RFE!!!\n"); |
e685c689 SL |
930 | break; |
931 | case eret_op: | |
932 | er = kvm_mips_emul_eret(vcpu); | |
933 | goto dont_update_pc; | |
934 | break; | |
935 | case wait_op: | |
936 | er = kvm_mips_emul_wait(vcpu); | |
937 | break; | |
938 | } | |
939 | } else { | |
940 | switch (copz) { | |
941 | case mfc_op: | |
942 | #ifdef CONFIG_KVM_MIPS_DEBUG_COP0_COUNTERS | |
943 | cop0->stat[rd][sel]++; | |
944 | #endif | |
945 | /* Get reg */ | |
946 | if ((rd == MIPS_CP0_COUNT) && (sel == 0)) { | |
e30492bb | 947 | vcpu->arch.gprs[rt] = kvm_mips_read_count(vcpu); |
e685c689 SL |
948 | } else if ((rd == MIPS_CP0_ERRCTL) && (sel == 0)) { |
949 | vcpu->arch.gprs[rt] = 0x0; | |
950 | #ifdef CONFIG_KVM_MIPS_DYN_TRANS | |
951 | kvm_mips_trans_mfc0(inst, opc, vcpu); | |
952 | #endif | |
d116e812 | 953 | } else { |
e685c689 SL |
954 | vcpu->arch.gprs[rt] = cop0->reg[rd][sel]; |
955 | ||
956 | #ifdef CONFIG_KVM_MIPS_DYN_TRANS | |
957 | kvm_mips_trans_mfc0(inst, opc, vcpu); | |
958 | #endif | |
959 | } | |
960 | ||
961 | kvm_debug | |
962 | ("[%#x] MFCz[%d][%d], vcpu->arch.gprs[%d]: %#lx\n", | |
963 | pc, rd, sel, rt, vcpu->arch.gprs[rt]); | |
964 | ||
965 | break; | |
966 | ||
967 | case dmfc_op: | |
968 | vcpu->arch.gprs[rt] = cop0->reg[rd][sel]; | |
969 | break; | |
970 | ||
971 | case mtc_op: | |
972 | #ifdef CONFIG_KVM_MIPS_DEBUG_COP0_COUNTERS | |
973 | cop0->stat[rd][sel]++; | |
974 | #endif | |
975 | if ((rd == MIPS_CP0_TLB_INDEX) | |
976 | && (vcpu->arch.gprs[rt] >= | |
977 | KVM_MIPS_GUEST_TLB_SIZE)) { | |
6ad78a5c DCZ |
978 | kvm_err("Invalid TLB Index: %ld", |
979 | vcpu->arch.gprs[rt]); | |
e685c689 SL |
980 | er = EMULATE_FAIL; |
981 | break; | |
982 | } | |
983 | #define C0_EBASE_CORE_MASK 0xff | |
984 | if ((rd == MIPS_CP0_PRID) && (sel == 1)) { | |
985 | /* Preserve CORE number */ | |
986 | kvm_change_c0_guest_ebase(cop0, | |
987 | ~(C0_EBASE_CORE_MASK), | |
988 | vcpu->arch.gprs[rt]); | |
6ad78a5c DCZ |
989 | kvm_err("MTCz, cop0->reg[EBASE]: %#lx\n", |
990 | kvm_read_c0_guest_ebase(cop0)); | |
e685c689 | 991 | } else if (rd == MIPS_CP0_TLB_HI && sel == 0) { |
48c4ac97 | 992 | uint32_t nasid = |
d116e812 DCZ |
993 | vcpu->arch.gprs[rt] & ASID_MASK; |
994 | if ((KSEGX(vcpu->arch.gprs[rt]) != CKSEG0) && | |
48c4ac97 DD |
995 | ((kvm_read_c0_guest_entryhi(cop0) & |
996 | ASID_MASK) != nasid)) { | |
d116e812 DCZ |
997 | kvm_debug("MTCz, change ASID from %#lx to %#lx\n", |
998 | kvm_read_c0_guest_entryhi(cop0) | |
999 | & ASID_MASK, | |
1000 | vcpu->arch.gprs[rt] | |
1001 | & ASID_MASK); | |
e685c689 SL |
1002 | |
1003 | /* Blow away the shadow host TLBs */ | |
1004 | kvm_mips_flush_host_tlb(1); | |
1005 | } | |
1006 | kvm_write_c0_guest_entryhi(cop0, | |
1007 | vcpu->arch.gprs[rt]); | |
1008 | } | |
1009 | /* Are we writing to COUNT */ | |
1010 | else if ((rd == MIPS_CP0_COUNT) && (sel == 0)) { | |
e30492bb | 1011 | kvm_mips_write_count(vcpu, vcpu->arch.gprs[rt]); |
e685c689 SL |
1012 | goto done; |
1013 | } else if ((rd == MIPS_CP0_COMPARE) && (sel == 0)) { | |
1014 | kvm_debug("[%#x] MTCz, COMPARE %#lx <- %#lx\n", | |
1015 | pc, kvm_read_c0_guest_compare(cop0), | |
1016 | vcpu->arch.gprs[rt]); | |
1017 | ||
1018 | /* If we are writing to COMPARE */ | |
1019 | /* Clear pending timer interrupt, if any */ | |
1020 | kvm_mips_callbacks->dequeue_timer_int(vcpu); | |
e30492bb JH |
1021 | kvm_mips_write_compare(vcpu, |
1022 | vcpu->arch.gprs[rt]); | |
e685c689 SL |
1023 | } else if ((rd == MIPS_CP0_STATUS) && (sel == 0)) { |
1024 | kvm_write_c0_guest_status(cop0, | |
1025 | vcpu->arch.gprs[rt]); | |
d116e812 DCZ |
1026 | /* |
1027 | * Make sure that CU1 and NMI bits are | |
1028 | * never set | |
1029 | */ | |
e685c689 SL |
1030 | kvm_clear_c0_guest_status(cop0, |
1031 | (ST0_CU1 | ST0_NMI)); | |
1032 | ||
1033 | #ifdef CONFIG_KVM_MIPS_DYN_TRANS | |
1034 | kvm_mips_trans_mtc0(inst, opc, vcpu); | |
1035 | #endif | |
e30492bb JH |
1036 | } else if ((rd == MIPS_CP0_CAUSE) && (sel == 0)) { |
1037 | uint32_t old_cause, new_cause; | |
d116e812 | 1038 | |
e30492bb JH |
1039 | old_cause = kvm_read_c0_guest_cause(cop0); |
1040 | new_cause = vcpu->arch.gprs[rt]; | |
1041 | /* Update R/W bits */ | |
1042 | kvm_change_c0_guest_cause(cop0, 0x08800300, | |
1043 | new_cause); | |
1044 | /* DC bit enabling/disabling timer? */ | |
1045 | if ((old_cause ^ new_cause) & CAUSEF_DC) { | |
1046 | if (new_cause & CAUSEF_DC) | |
1047 | kvm_mips_count_disable_cause(vcpu); | |
1048 | else | |
1049 | kvm_mips_count_enable_cause(vcpu); | |
1050 | } | |
e685c689 SL |
1051 | } else { |
1052 | cop0->reg[rd][sel] = vcpu->arch.gprs[rt]; | |
1053 | #ifdef CONFIG_KVM_MIPS_DYN_TRANS | |
1054 | kvm_mips_trans_mtc0(inst, opc, vcpu); | |
1055 | #endif | |
1056 | } | |
1057 | ||
1058 | kvm_debug("[%#x] MTCz, cop0->reg[%d][%d]: %#lx\n", pc, | |
1059 | rd, sel, cop0->reg[rd][sel]); | |
1060 | break; | |
1061 | ||
1062 | case dmtc_op: | |
6ad78a5c DCZ |
1063 | kvm_err("!!!!!!![%#lx]dmtc_op: rt: %d, rd: %d, sel: %d!!!!!!\n", |
1064 | vcpu->arch.pc, rt, rd, sel); | |
e685c689 SL |
1065 | er = EMULATE_FAIL; |
1066 | break; | |
1067 | ||
1068 | case mfmcz_op: | |
1069 | #ifdef KVM_MIPS_DEBUG_COP0_COUNTERS | |
1070 | cop0->stat[MIPS_CP0_STATUS][0]++; | |
1071 | #endif | |
1072 | if (rt != 0) { | |
1073 | vcpu->arch.gprs[rt] = | |
1074 | kvm_read_c0_guest_status(cop0); | |
1075 | } | |
1076 | /* EI */ | |
1077 | if (inst & 0x20) { | |
1078 | kvm_debug("[%#lx] mfmcz_op: EI\n", | |
1079 | vcpu->arch.pc); | |
1080 | kvm_set_c0_guest_status(cop0, ST0_IE); | |
1081 | } else { | |
1082 | kvm_debug("[%#lx] mfmcz_op: DI\n", | |
1083 | vcpu->arch.pc); | |
1084 | kvm_clear_c0_guest_status(cop0, ST0_IE); | |
1085 | } | |
1086 | ||
1087 | break; | |
1088 | ||
1089 | case wrpgpr_op: | |
1090 | { | |
1091 | uint32_t css = | |
1092 | cop0->reg[MIPS_CP0_STATUS][2] & 0xf; | |
1093 | uint32_t pss = | |
1094 | (cop0->reg[MIPS_CP0_STATUS][2] >> 6) & 0xf; | |
d116e812 DCZ |
1095 | /* |
1096 | * We don't support any shadow register sets, so | |
1097 | * SRSCtl[PSS] == SRSCtl[CSS] = 0 | |
1098 | */ | |
e685c689 SL |
1099 | if (css || pss) { |
1100 | er = EMULATE_FAIL; | |
1101 | break; | |
1102 | } | |
1103 | kvm_debug("WRPGPR[%d][%d] = %#lx\n", pss, rd, | |
1104 | vcpu->arch.gprs[rt]); | |
1105 | vcpu->arch.gprs[rd] = vcpu->arch.gprs[rt]; | |
1106 | } | |
1107 | break; | |
1108 | default: | |
6ad78a5c DCZ |
1109 | kvm_err("[%#lx]MachEmulateCP0: unsupported COP0, copz: 0x%x\n", |
1110 | vcpu->arch.pc, copz); | |
e685c689 SL |
1111 | er = EMULATE_FAIL; |
1112 | break; | |
1113 | } | |
1114 | } | |
1115 | ||
1116 | done: | |
d116e812 DCZ |
1117 | /* Rollback PC only if emulation was unsuccessful */ |
1118 | if (er == EMULATE_FAIL) | |
e685c689 | 1119 | vcpu->arch.pc = curr_pc; |
e685c689 SL |
1120 | |
1121 | dont_update_pc: | |
1122 | /* | |
1123 | * This is for special instructions whose emulation | |
1124 | * updates the PC, so do not overwrite the PC under | |
1125 | * any circumstances | |
1126 | */ | |
1127 | ||
1128 | return er; | |
1129 | } | |
1130 | ||
d116e812 DCZ |
1131 | enum emulation_result kvm_mips_emulate_store(uint32_t inst, uint32_t cause, |
1132 | struct kvm_run *run, | |
1133 | struct kvm_vcpu *vcpu) | |
e685c689 SL |
1134 | { |
1135 | enum emulation_result er = EMULATE_DO_MMIO; | |
1136 | int32_t op, base, rt, offset; | |
1137 | uint32_t bytes; | |
1138 | void *data = run->mmio.data; | |
1139 | unsigned long curr_pc; | |
1140 | ||
1141 | /* | |
1142 | * Update PC and hold onto current PC in case there is | |
1143 | * an error and we want to rollback the PC | |
1144 | */ | |
1145 | curr_pc = vcpu->arch.pc; | |
1146 | er = update_pc(vcpu, cause); | |
1147 | if (er == EMULATE_FAIL) | |
1148 | return er; | |
1149 | ||
1150 | rt = (inst >> 16) & 0x1f; | |
1151 | base = (inst >> 21) & 0x1f; | |
1152 | offset = inst & 0xffff; | |
1153 | op = (inst >> 26) & 0x3f; | |
1154 | ||
1155 | switch (op) { | |
1156 | case sb_op: | |
1157 | bytes = 1; | |
1158 | if (bytes > sizeof(run->mmio.data)) { | |
1159 | kvm_err("%s: bad MMIO length: %d\n", __func__, | |
1160 | run->mmio.len); | |
1161 | } | |
1162 | run->mmio.phys_addr = | |
1163 | kvm_mips_callbacks->gva_to_gpa(vcpu->arch. | |
1164 | host_cp0_badvaddr); | |
1165 | if (run->mmio.phys_addr == KVM_INVALID_ADDR) { | |
1166 | er = EMULATE_FAIL; | |
1167 | break; | |
1168 | } | |
1169 | run->mmio.len = bytes; | |
1170 | run->mmio.is_write = 1; | |
1171 | vcpu->mmio_needed = 1; | |
1172 | vcpu->mmio_is_write = 1; | |
1173 | *(u8 *) data = vcpu->arch.gprs[rt]; | |
1174 | kvm_debug("OP_SB: eaddr: %#lx, gpr: %#lx, data: %#x\n", | |
1175 | vcpu->arch.host_cp0_badvaddr, vcpu->arch.gprs[rt], | |
1176 | *(uint8_t *) data); | |
1177 | ||
1178 | break; | |
1179 | ||
1180 | case sw_op: | |
1181 | bytes = 4; | |
1182 | if (bytes > sizeof(run->mmio.data)) { | |
1183 | kvm_err("%s: bad MMIO length: %d\n", __func__, | |
1184 | run->mmio.len); | |
1185 | } | |
1186 | run->mmio.phys_addr = | |
1187 | kvm_mips_callbacks->gva_to_gpa(vcpu->arch. | |
1188 | host_cp0_badvaddr); | |
1189 | if (run->mmio.phys_addr == KVM_INVALID_ADDR) { | |
1190 | er = EMULATE_FAIL; | |
1191 | break; | |
1192 | } | |
1193 | ||
1194 | run->mmio.len = bytes; | |
1195 | run->mmio.is_write = 1; | |
1196 | vcpu->mmio_needed = 1; | |
1197 | vcpu->mmio_is_write = 1; | |
1198 | *(uint32_t *) data = vcpu->arch.gprs[rt]; | |
1199 | ||
1200 | kvm_debug("[%#lx] OP_SW: eaddr: %#lx, gpr: %#lx, data: %#x\n", | |
1201 | vcpu->arch.pc, vcpu->arch.host_cp0_badvaddr, | |
1202 | vcpu->arch.gprs[rt], *(uint32_t *) data); | |
1203 | break; | |
1204 | ||
1205 | case sh_op: | |
1206 | bytes = 2; | |
1207 | if (bytes > sizeof(run->mmio.data)) { | |
1208 | kvm_err("%s: bad MMIO length: %d\n", __func__, | |
1209 | run->mmio.len); | |
1210 | } | |
1211 | run->mmio.phys_addr = | |
1212 | kvm_mips_callbacks->gva_to_gpa(vcpu->arch. | |
1213 | host_cp0_badvaddr); | |
1214 | if (run->mmio.phys_addr == KVM_INVALID_ADDR) { | |
1215 | er = EMULATE_FAIL; | |
1216 | break; | |
1217 | } | |
1218 | ||
1219 | run->mmio.len = bytes; | |
1220 | run->mmio.is_write = 1; | |
1221 | vcpu->mmio_needed = 1; | |
1222 | vcpu->mmio_is_write = 1; | |
1223 | *(uint16_t *) data = vcpu->arch.gprs[rt]; | |
1224 | ||
1225 | kvm_debug("[%#lx] OP_SH: eaddr: %#lx, gpr: %#lx, data: %#x\n", | |
1226 | vcpu->arch.pc, vcpu->arch.host_cp0_badvaddr, | |
1227 | vcpu->arch.gprs[rt], *(uint32_t *) data); | |
1228 | break; | |
1229 | ||
1230 | default: | |
6ad78a5c | 1231 | kvm_err("Store not yet supported"); |
e685c689 SL |
1232 | er = EMULATE_FAIL; |
1233 | break; | |
1234 | } | |
1235 | ||
d116e812 DCZ |
1236 | /* Rollback PC if emulation was unsuccessful */ |
1237 | if (er == EMULATE_FAIL) | |
e685c689 | 1238 | vcpu->arch.pc = curr_pc; |
e685c689 SL |
1239 | |
1240 | return er; | |
1241 | } | |
1242 | ||
d116e812 DCZ |
1243 | enum emulation_result kvm_mips_emulate_load(uint32_t inst, uint32_t cause, |
1244 | struct kvm_run *run, | |
1245 | struct kvm_vcpu *vcpu) | |
e685c689 SL |
1246 | { |
1247 | enum emulation_result er = EMULATE_DO_MMIO; | |
1248 | int32_t op, base, rt, offset; | |
1249 | uint32_t bytes; | |
1250 | ||
1251 | rt = (inst >> 16) & 0x1f; | |
1252 | base = (inst >> 21) & 0x1f; | |
1253 | offset = inst & 0xffff; | |
1254 | op = (inst >> 26) & 0x3f; | |
1255 | ||
1256 | vcpu->arch.pending_load_cause = cause; | |
1257 | vcpu->arch.io_gpr = rt; | |
1258 | ||
1259 | switch (op) { | |
1260 | case lw_op: | |
1261 | bytes = 4; | |
1262 | if (bytes > sizeof(run->mmio.data)) { | |
1263 | kvm_err("%s: bad MMIO length: %d\n", __func__, | |
1264 | run->mmio.len); | |
1265 | er = EMULATE_FAIL; | |
1266 | break; | |
1267 | } | |
1268 | run->mmio.phys_addr = | |
1269 | kvm_mips_callbacks->gva_to_gpa(vcpu->arch. | |
1270 | host_cp0_badvaddr); | |
1271 | if (run->mmio.phys_addr == KVM_INVALID_ADDR) { | |
1272 | er = EMULATE_FAIL; | |
1273 | break; | |
1274 | } | |
1275 | ||
1276 | run->mmio.len = bytes; | |
1277 | run->mmio.is_write = 0; | |
1278 | vcpu->mmio_needed = 1; | |
1279 | vcpu->mmio_is_write = 0; | |
1280 | break; | |
1281 | ||
1282 | case lh_op: | |
1283 | case lhu_op: | |
1284 | bytes = 2; | |
1285 | if (bytes > sizeof(run->mmio.data)) { | |
1286 | kvm_err("%s: bad MMIO length: %d\n", __func__, | |
1287 | run->mmio.len); | |
1288 | er = EMULATE_FAIL; | |
1289 | break; | |
1290 | } | |
1291 | run->mmio.phys_addr = | |
1292 | kvm_mips_callbacks->gva_to_gpa(vcpu->arch. | |
1293 | host_cp0_badvaddr); | |
1294 | if (run->mmio.phys_addr == KVM_INVALID_ADDR) { | |
1295 | er = EMULATE_FAIL; | |
1296 | break; | |
1297 | } | |
1298 | ||
1299 | run->mmio.len = bytes; | |
1300 | run->mmio.is_write = 0; | |
1301 | vcpu->mmio_needed = 1; | |
1302 | vcpu->mmio_is_write = 0; | |
1303 | ||
1304 | if (op == lh_op) | |
1305 | vcpu->mmio_needed = 2; | |
1306 | else | |
1307 | vcpu->mmio_needed = 1; | |
1308 | ||
1309 | break; | |
1310 | ||
1311 | case lbu_op: | |
1312 | case lb_op: | |
1313 | bytes = 1; | |
1314 | if (bytes > sizeof(run->mmio.data)) { | |
1315 | kvm_err("%s: bad MMIO length: %d\n", __func__, | |
1316 | run->mmio.len); | |
1317 | er = EMULATE_FAIL; | |
1318 | break; | |
1319 | } | |
1320 | run->mmio.phys_addr = | |
1321 | kvm_mips_callbacks->gva_to_gpa(vcpu->arch. | |
1322 | host_cp0_badvaddr); | |
1323 | if (run->mmio.phys_addr == KVM_INVALID_ADDR) { | |
1324 | er = EMULATE_FAIL; | |
1325 | break; | |
1326 | } | |
1327 | ||
1328 | run->mmio.len = bytes; | |
1329 | run->mmio.is_write = 0; | |
1330 | vcpu->mmio_is_write = 0; | |
1331 | ||
1332 | if (op == lb_op) | |
1333 | vcpu->mmio_needed = 2; | |
1334 | else | |
1335 | vcpu->mmio_needed = 1; | |
1336 | ||
1337 | break; | |
1338 | ||
1339 | default: | |
6ad78a5c | 1340 | kvm_err("Load not yet supported"); |
e685c689 SL |
1341 | er = EMULATE_FAIL; |
1342 | break; | |
1343 | } | |
1344 | ||
1345 | return er; | |
1346 | } | |
1347 | ||
1348 | int kvm_mips_sync_icache(unsigned long va, struct kvm_vcpu *vcpu) | |
1349 | { | |
1350 | unsigned long offset = (va & ~PAGE_MASK); | |
1351 | struct kvm *kvm = vcpu->kvm; | |
1352 | unsigned long pa; | |
1353 | gfn_t gfn; | |
1354 | pfn_t pfn; | |
1355 | ||
1356 | gfn = va >> PAGE_SHIFT; | |
1357 | ||
1358 | if (gfn >= kvm->arch.guest_pmap_npages) { | |
6ad78a5c | 1359 | kvm_err("%s: Invalid gfn: %#llx\n", __func__, gfn); |
e685c689 SL |
1360 | kvm_mips_dump_host_tlbs(); |
1361 | kvm_arch_vcpu_dump_regs(vcpu); | |
1362 | return -1; | |
1363 | } | |
1364 | pfn = kvm->arch.guest_pmap[gfn]; | |
1365 | pa = (pfn << PAGE_SHIFT) | offset; | |
1366 | ||
6ad78a5c DCZ |
1367 | kvm_debug("%s: va: %#lx, unmapped: %#x\n", __func__, va, |
1368 | CKSEG0ADDR(pa)); | |
e685c689 | 1369 | |
facaaec1 | 1370 | local_flush_icache_range(CKSEG0ADDR(pa), 32); |
e685c689 SL |
1371 | return 0; |
1372 | } | |
1373 | ||
1374 | #define MIPS_CACHE_OP_INDEX_INV 0x0 | |
1375 | #define MIPS_CACHE_OP_INDEX_LD_TAG 0x1 | |
1376 | #define MIPS_CACHE_OP_INDEX_ST_TAG 0x2 | |
1377 | #define MIPS_CACHE_OP_IMP 0x3 | |
1378 | #define MIPS_CACHE_OP_HIT_INV 0x4 | |
1379 | #define MIPS_CACHE_OP_FILL_WB_INV 0x5 | |
1380 | #define MIPS_CACHE_OP_HIT_HB 0x6 | |
1381 | #define MIPS_CACHE_OP_FETCH_LOCK 0x7 | |
1382 | ||
1383 | #define MIPS_CACHE_ICACHE 0x0 | |
1384 | #define MIPS_CACHE_DCACHE 0x1 | |
1385 | #define MIPS_CACHE_SEC 0x3 | |
1386 | ||
d116e812 DCZ |
1387 | enum emulation_result kvm_mips_emulate_cache(uint32_t inst, uint32_t *opc, |
1388 | uint32_t cause, | |
1389 | struct kvm_run *run, | |
1390 | struct kvm_vcpu *vcpu) | |
e685c689 SL |
1391 | { |
1392 | struct mips_coproc *cop0 = vcpu->arch.cop0; | |
e685c689 SL |
1393 | enum emulation_result er = EMULATE_DONE; |
1394 | int32_t offset, cache, op_inst, op, base; | |
1395 | struct kvm_vcpu_arch *arch = &vcpu->arch; | |
1396 | unsigned long va; | |
1397 | unsigned long curr_pc; | |
1398 | ||
1399 | /* | |
1400 | * Update PC and hold onto current PC in case there is | |
1401 | * an error and we want to rollback the PC | |
1402 | */ | |
1403 | curr_pc = vcpu->arch.pc; | |
1404 | er = update_pc(vcpu, cause); | |
1405 | if (er == EMULATE_FAIL) | |
1406 | return er; | |
1407 | ||
1408 | base = (inst >> 21) & 0x1f; | |
1409 | op_inst = (inst >> 16) & 0x1f; | |
1410 | offset = inst & 0xffff; | |
1411 | cache = (inst >> 16) & 0x3; | |
1412 | op = (inst >> 18) & 0x7; | |
1413 | ||
1414 | va = arch->gprs[base] + offset; | |
1415 | ||
1416 | kvm_debug("CACHE (cache: %#x, op: %#x, base[%d]: %#lx, offset: %#x\n", | |
1417 | cache, op, base, arch->gprs[base], offset); | |
1418 | ||
d116e812 DCZ |
1419 | /* |
1420 | * Treat INDEX_INV as a nop, basically issued by Linux on startup to | |
1421 | * invalidate the caches entirely by stepping through all the | |
1422 | * ways/indexes | |
e685c689 SL |
1423 | */ |
1424 | if (op == MIPS_CACHE_OP_INDEX_INV) { | |
d116e812 DCZ |
1425 | kvm_debug("@ %#lx/%#lx CACHE (cache: %#x, op: %#x, base[%d]: %#lx, offset: %#x\n", |
1426 | vcpu->arch.pc, vcpu->arch.gprs[31], cache, op, base, | |
1427 | arch->gprs[base], offset); | |
e685c689 SL |
1428 | |
1429 | if (cache == MIPS_CACHE_DCACHE) | |
1430 | r4k_blast_dcache(); | |
1431 | else if (cache == MIPS_CACHE_ICACHE) | |
1432 | r4k_blast_icache(); | |
1433 | else { | |
6ad78a5c DCZ |
1434 | kvm_err("%s: unsupported CACHE INDEX operation\n", |
1435 | __func__); | |
e685c689 SL |
1436 | return EMULATE_FAIL; |
1437 | } | |
1438 | ||
1439 | #ifdef CONFIG_KVM_MIPS_DYN_TRANS | |
1440 | kvm_mips_trans_cache_index(inst, opc, vcpu); | |
1441 | #endif | |
1442 | goto done; | |
1443 | } | |
1444 | ||
1445 | preempt_disable(); | |
1446 | if (KVM_GUEST_KSEGX(va) == KVM_GUEST_KSEG0) { | |
d116e812 | 1447 | if (kvm_mips_host_tlb_lookup(vcpu, va) < 0) |
e685c689 | 1448 | kvm_mips_handle_kseg0_tlb_fault(va, vcpu); |
e685c689 SL |
1449 | } else if ((KVM_GUEST_KSEGX(va) < KVM_GUEST_KSEG0) || |
1450 | KVM_GUEST_KSEGX(va) == KVM_GUEST_KSEG23) { | |
1451 | int index; | |
1452 | ||
1453 | /* If an entry already exists then skip */ | |
d116e812 | 1454 | if (kvm_mips_host_tlb_lookup(vcpu, va) >= 0) |
e685c689 | 1455 | goto skip_fault; |
e685c689 | 1456 | |
d116e812 DCZ |
1457 | /* |
1458 | * If address not in the guest TLB, then give the guest a fault, | |
1459 | * the resulting handler will do the right thing | |
e685c689 SL |
1460 | */ |
1461 | index = kvm_mips_guest_tlb_lookup(vcpu, (va & VPN2_MASK) | | |
48c4ac97 DD |
1462 | (kvm_read_c0_guest_entryhi |
1463 | (cop0) & ASID_MASK)); | |
e685c689 SL |
1464 | |
1465 | if (index < 0) { | |
1466 | vcpu->arch.host_cp0_entryhi = (va & VPN2_MASK); | |
1467 | vcpu->arch.host_cp0_badvaddr = va; | |
1468 | er = kvm_mips_emulate_tlbmiss_ld(cause, NULL, run, | |
1469 | vcpu); | |
1470 | preempt_enable(); | |
1471 | goto dont_update_pc; | |
1472 | } else { | |
1473 | struct kvm_mips_tlb *tlb = &vcpu->arch.guest_tlb[index]; | |
d116e812 DCZ |
1474 | /* |
1475 | * Check if the entry is valid, if not then setup a TLB | |
1476 | * invalid exception to the guest | |
1477 | */ | |
e685c689 SL |
1478 | if (!TLB_IS_VALID(*tlb, va)) { |
1479 | er = kvm_mips_emulate_tlbinv_ld(cause, NULL, | |
1480 | run, vcpu); | |
1481 | preempt_enable(); | |
1482 | goto dont_update_pc; | |
1483 | } else { | |
d116e812 DCZ |
1484 | /* |
1485 | * We fault an entry from the guest tlb to the | |
1486 | * shadow host TLB | |
1487 | */ | |
e685c689 SL |
1488 | kvm_mips_handle_mapped_seg_tlb_fault(vcpu, tlb, |
1489 | NULL, | |
1490 | NULL); | |
1491 | } | |
1492 | } | |
1493 | } else { | |
6ad78a5c DCZ |
1494 | kvm_err("INVALID CACHE INDEX/ADDRESS (cache: %#x, op: %#x, base[%d]: %#lx, offset: %#x\n", |
1495 | cache, op, base, arch->gprs[base], offset); | |
e685c689 SL |
1496 | er = EMULATE_FAIL; |
1497 | preempt_enable(); | |
1498 | goto dont_update_pc; | |
1499 | ||
1500 | } | |
1501 | ||
1502 | skip_fault: | |
1503 | /* XXXKYMA: Only a subset of cache ops are supported, used by Linux */ | |
1504 | if (cache == MIPS_CACHE_DCACHE | |
1505 | && (op == MIPS_CACHE_OP_FILL_WB_INV | |
1506 | || op == MIPS_CACHE_OP_HIT_INV)) { | |
1507 | flush_dcache_line(va); | |
1508 | ||
1509 | #ifdef CONFIG_KVM_MIPS_DYN_TRANS | |
d116e812 DCZ |
1510 | /* |
1511 | * Replace the CACHE instruction, with a SYNCI, not the same, | |
1512 | * but avoids a trap | |
1513 | */ | |
e685c689 SL |
1514 | kvm_mips_trans_cache_va(inst, opc, vcpu); |
1515 | #endif | |
1516 | } else if (op == MIPS_CACHE_OP_HIT_INV && cache == MIPS_CACHE_ICACHE) { | |
1517 | flush_dcache_line(va); | |
1518 | flush_icache_line(va); | |
1519 | ||
1520 | #ifdef CONFIG_KVM_MIPS_DYN_TRANS | |
1521 | /* Replace the CACHE instruction, with a SYNCI */ | |
1522 | kvm_mips_trans_cache_va(inst, opc, vcpu); | |
1523 | #endif | |
1524 | } else { | |
6ad78a5c DCZ |
1525 | kvm_err("NO-OP CACHE (cache: %#x, op: %#x, base[%d]: %#lx, offset: %#x\n", |
1526 | cache, op, base, arch->gprs[base], offset); | |
e685c689 SL |
1527 | er = EMULATE_FAIL; |
1528 | preempt_enable(); | |
1529 | goto dont_update_pc; | |
1530 | } | |
1531 | ||
1532 | preempt_enable(); | |
1533 | ||
d116e812 DCZ |
1534 | dont_update_pc: |
1535 | /* Rollback PC */ | |
e685c689 | 1536 | vcpu->arch.pc = curr_pc; |
d116e812 | 1537 | done: |
e685c689 SL |
1538 | return er; |
1539 | } | |
1540 | ||
d116e812 DCZ |
1541 | enum emulation_result kvm_mips_emulate_inst(unsigned long cause, uint32_t *opc, |
1542 | struct kvm_run *run, | |
1543 | struct kvm_vcpu *vcpu) | |
e685c689 SL |
1544 | { |
1545 | enum emulation_result er = EMULATE_DONE; | |
1546 | uint32_t inst; | |
1547 | ||
d116e812 DCZ |
1548 | /* Fetch the instruction. */ |
1549 | if (cause & CAUSEF_BD) | |
e685c689 | 1550 | opc += 1; |
e685c689 SL |
1551 | |
1552 | inst = kvm_get_inst(opc, vcpu); | |
1553 | ||
1554 | switch (((union mips_instruction)inst).r_format.opcode) { | |
1555 | case cop0_op: | |
1556 | er = kvm_mips_emulate_CP0(inst, opc, cause, run, vcpu); | |
1557 | break; | |
1558 | case sb_op: | |
1559 | case sh_op: | |
1560 | case sw_op: | |
1561 | er = kvm_mips_emulate_store(inst, cause, run, vcpu); | |
1562 | break; | |
1563 | case lb_op: | |
1564 | case lbu_op: | |
1565 | case lhu_op: | |
1566 | case lh_op: | |
1567 | case lw_op: | |
1568 | er = kvm_mips_emulate_load(inst, cause, run, vcpu); | |
1569 | break; | |
1570 | ||
1571 | case cache_op: | |
1572 | ++vcpu->stat.cache_exits; | |
1573 | trace_kvm_exit(vcpu, CACHE_EXITS); | |
1574 | er = kvm_mips_emulate_cache(inst, opc, cause, run, vcpu); | |
1575 | break; | |
1576 | ||
1577 | default: | |
6ad78a5c DCZ |
1578 | kvm_err("Instruction emulation not supported (%p/%#x)\n", opc, |
1579 | inst); | |
e685c689 SL |
1580 | kvm_arch_vcpu_dump_regs(vcpu); |
1581 | er = EMULATE_FAIL; | |
1582 | break; | |
1583 | } | |
1584 | ||
1585 | return er; | |
1586 | } | |
1587 | ||
d116e812 DCZ |
1588 | enum emulation_result kvm_mips_emulate_syscall(unsigned long cause, |
1589 | uint32_t *opc, | |
1590 | struct kvm_run *run, | |
1591 | struct kvm_vcpu *vcpu) | |
e685c689 SL |
1592 | { |
1593 | struct mips_coproc *cop0 = vcpu->arch.cop0; | |
1594 | struct kvm_vcpu_arch *arch = &vcpu->arch; | |
1595 | enum emulation_result er = EMULATE_DONE; | |
1596 | ||
1597 | if ((kvm_read_c0_guest_status(cop0) & ST0_EXL) == 0) { | |
1598 | /* save old pc */ | |
1599 | kvm_write_c0_guest_epc(cop0, arch->pc); | |
1600 | kvm_set_c0_guest_status(cop0, ST0_EXL); | |
1601 | ||
1602 | if (cause & CAUSEF_BD) | |
1603 | kvm_set_c0_guest_cause(cop0, CAUSEF_BD); | |
1604 | else | |
1605 | kvm_clear_c0_guest_cause(cop0, CAUSEF_BD); | |
1606 | ||
1607 | kvm_debug("Delivering SYSCALL @ pc %#lx\n", arch->pc); | |
1608 | ||
1609 | kvm_change_c0_guest_cause(cop0, (0xff), | |
1610 | (T_SYSCALL << CAUSEB_EXCCODE)); | |
1611 | ||
1612 | /* Set PC to the exception entry point */ | |
1613 | arch->pc = KVM_GUEST_KSEG0 + 0x180; | |
1614 | ||
1615 | } else { | |
6ad78a5c | 1616 | kvm_err("Trying to deliver SYSCALL when EXL is already set\n"); |
e685c689 SL |
1617 | er = EMULATE_FAIL; |
1618 | } | |
1619 | ||
1620 | return er; | |
1621 | } | |
1622 | ||
d116e812 DCZ |
1623 | enum emulation_result kvm_mips_emulate_tlbmiss_ld(unsigned long cause, |
1624 | uint32_t *opc, | |
1625 | struct kvm_run *run, | |
1626 | struct kvm_vcpu *vcpu) | |
e685c689 SL |
1627 | { |
1628 | struct mips_coproc *cop0 = vcpu->arch.cop0; | |
1629 | struct kvm_vcpu_arch *arch = &vcpu->arch; | |
e685c689 | 1630 | unsigned long entryhi = (vcpu->arch. host_cp0_badvaddr & VPN2_MASK) | |
48c4ac97 | 1631 | (kvm_read_c0_guest_entryhi(cop0) & ASID_MASK); |
e685c689 SL |
1632 | |
1633 | if ((kvm_read_c0_guest_status(cop0) & ST0_EXL) == 0) { | |
1634 | /* save old pc */ | |
1635 | kvm_write_c0_guest_epc(cop0, arch->pc); | |
1636 | kvm_set_c0_guest_status(cop0, ST0_EXL); | |
1637 | ||
1638 | if (cause & CAUSEF_BD) | |
1639 | kvm_set_c0_guest_cause(cop0, CAUSEF_BD); | |
1640 | else | |
1641 | kvm_clear_c0_guest_cause(cop0, CAUSEF_BD); | |
1642 | ||
1643 | kvm_debug("[EXL == 0] delivering TLB MISS @ pc %#lx\n", | |
1644 | arch->pc); | |
1645 | ||
1646 | /* set pc to the exception entry point */ | |
1647 | arch->pc = KVM_GUEST_KSEG0 + 0x0; | |
1648 | ||
1649 | } else { | |
1650 | kvm_debug("[EXL == 1] delivering TLB MISS @ pc %#lx\n", | |
1651 | arch->pc); | |
1652 | ||
1653 | arch->pc = KVM_GUEST_KSEG0 + 0x180; | |
1654 | } | |
1655 | ||
1656 | kvm_change_c0_guest_cause(cop0, (0xff), | |
1657 | (T_TLB_LD_MISS << CAUSEB_EXCCODE)); | |
1658 | ||
1659 | /* setup badvaddr, context and entryhi registers for the guest */ | |
1660 | kvm_write_c0_guest_badvaddr(cop0, vcpu->arch.host_cp0_badvaddr); | |
1661 | /* XXXKYMA: is the context register used by linux??? */ | |
1662 | kvm_write_c0_guest_entryhi(cop0, entryhi); | |
1663 | /* Blow away the shadow host TLBs */ | |
1664 | kvm_mips_flush_host_tlb(1); | |
1665 | ||
d98403a5 | 1666 | return EMULATE_DONE; |
e685c689 SL |
1667 | } |
1668 | ||
d116e812 DCZ |
1669 | enum emulation_result kvm_mips_emulate_tlbinv_ld(unsigned long cause, |
1670 | uint32_t *opc, | |
1671 | struct kvm_run *run, | |
1672 | struct kvm_vcpu *vcpu) | |
e685c689 SL |
1673 | { |
1674 | struct mips_coproc *cop0 = vcpu->arch.cop0; | |
1675 | struct kvm_vcpu_arch *arch = &vcpu->arch; | |
e685c689 SL |
1676 | unsigned long entryhi = |
1677 | (vcpu->arch.host_cp0_badvaddr & VPN2_MASK) | | |
48c4ac97 | 1678 | (kvm_read_c0_guest_entryhi(cop0) & ASID_MASK); |
e685c689 SL |
1679 | |
1680 | if ((kvm_read_c0_guest_status(cop0) & ST0_EXL) == 0) { | |
1681 | /* save old pc */ | |
1682 | kvm_write_c0_guest_epc(cop0, arch->pc); | |
1683 | kvm_set_c0_guest_status(cop0, ST0_EXL); | |
1684 | ||
1685 | if (cause & CAUSEF_BD) | |
1686 | kvm_set_c0_guest_cause(cop0, CAUSEF_BD); | |
1687 | else | |
1688 | kvm_clear_c0_guest_cause(cop0, CAUSEF_BD); | |
1689 | ||
1690 | kvm_debug("[EXL == 0] delivering TLB INV @ pc %#lx\n", | |
1691 | arch->pc); | |
1692 | ||
1693 | /* set pc to the exception entry point */ | |
1694 | arch->pc = KVM_GUEST_KSEG0 + 0x180; | |
1695 | ||
1696 | } else { | |
1697 | kvm_debug("[EXL == 1] delivering TLB MISS @ pc %#lx\n", | |
1698 | arch->pc); | |
1699 | arch->pc = KVM_GUEST_KSEG0 + 0x180; | |
1700 | } | |
1701 | ||
1702 | kvm_change_c0_guest_cause(cop0, (0xff), | |
1703 | (T_TLB_LD_MISS << CAUSEB_EXCCODE)); | |
1704 | ||
1705 | /* setup badvaddr, context and entryhi registers for the guest */ | |
1706 | kvm_write_c0_guest_badvaddr(cop0, vcpu->arch.host_cp0_badvaddr); | |
1707 | /* XXXKYMA: is the context register used by linux??? */ | |
1708 | kvm_write_c0_guest_entryhi(cop0, entryhi); | |
1709 | /* Blow away the shadow host TLBs */ | |
1710 | kvm_mips_flush_host_tlb(1); | |
1711 | ||
d98403a5 | 1712 | return EMULATE_DONE; |
e685c689 SL |
1713 | } |
1714 | ||
d116e812 DCZ |
1715 | enum emulation_result kvm_mips_emulate_tlbmiss_st(unsigned long cause, |
1716 | uint32_t *opc, | |
1717 | struct kvm_run *run, | |
1718 | struct kvm_vcpu *vcpu) | |
e685c689 SL |
1719 | { |
1720 | struct mips_coproc *cop0 = vcpu->arch.cop0; | |
1721 | struct kvm_vcpu_arch *arch = &vcpu->arch; | |
e685c689 | 1722 | unsigned long entryhi = (vcpu->arch.host_cp0_badvaddr & VPN2_MASK) | |
48c4ac97 | 1723 | (kvm_read_c0_guest_entryhi(cop0) & ASID_MASK); |
e685c689 SL |
1724 | |
1725 | if ((kvm_read_c0_guest_status(cop0) & ST0_EXL) == 0) { | |
1726 | /* save old pc */ | |
1727 | kvm_write_c0_guest_epc(cop0, arch->pc); | |
1728 | kvm_set_c0_guest_status(cop0, ST0_EXL); | |
1729 | ||
1730 | if (cause & CAUSEF_BD) | |
1731 | kvm_set_c0_guest_cause(cop0, CAUSEF_BD); | |
1732 | else | |
1733 | kvm_clear_c0_guest_cause(cop0, CAUSEF_BD); | |
1734 | ||
1735 | kvm_debug("[EXL == 0] Delivering TLB MISS @ pc %#lx\n", | |
1736 | arch->pc); | |
1737 | ||
1738 | /* Set PC to the exception entry point */ | |
1739 | arch->pc = KVM_GUEST_KSEG0 + 0x0; | |
1740 | } else { | |
1741 | kvm_debug("[EXL == 1] Delivering TLB MISS @ pc %#lx\n", | |
1742 | arch->pc); | |
1743 | arch->pc = KVM_GUEST_KSEG0 + 0x180; | |
1744 | } | |
1745 | ||
1746 | kvm_change_c0_guest_cause(cop0, (0xff), | |
1747 | (T_TLB_ST_MISS << CAUSEB_EXCCODE)); | |
1748 | ||
1749 | /* setup badvaddr, context and entryhi registers for the guest */ | |
1750 | kvm_write_c0_guest_badvaddr(cop0, vcpu->arch.host_cp0_badvaddr); | |
1751 | /* XXXKYMA: is the context register used by linux??? */ | |
1752 | kvm_write_c0_guest_entryhi(cop0, entryhi); | |
1753 | /* Blow away the shadow host TLBs */ | |
1754 | kvm_mips_flush_host_tlb(1); | |
1755 | ||
d98403a5 | 1756 | return EMULATE_DONE; |
e685c689 SL |
1757 | } |
1758 | ||
d116e812 DCZ |
1759 | enum emulation_result kvm_mips_emulate_tlbinv_st(unsigned long cause, |
1760 | uint32_t *opc, | |
1761 | struct kvm_run *run, | |
1762 | struct kvm_vcpu *vcpu) | |
e685c689 SL |
1763 | { |
1764 | struct mips_coproc *cop0 = vcpu->arch.cop0; | |
1765 | struct kvm_vcpu_arch *arch = &vcpu->arch; | |
e685c689 | 1766 | unsigned long entryhi = (vcpu->arch.host_cp0_badvaddr & VPN2_MASK) | |
48c4ac97 | 1767 | (kvm_read_c0_guest_entryhi(cop0) & ASID_MASK); |
e685c689 SL |
1768 | |
1769 | if ((kvm_read_c0_guest_status(cop0) & ST0_EXL) == 0) { | |
1770 | /* save old pc */ | |
1771 | kvm_write_c0_guest_epc(cop0, arch->pc); | |
1772 | kvm_set_c0_guest_status(cop0, ST0_EXL); | |
1773 | ||
1774 | if (cause & CAUSEF_BD) | |
1775 | kvm_set_c0_guest_cause(cop0, CAUSEF_BD); | |
1776 | else | |
1777 | kvm_clear_c0_guest_cause(cop0, CAUSEF_BD); | |
1778 | ||
1779 | kvm_debug("[EXL == 0] Delivering TLB MISS @ pc %#lx\n", | |
1780 | arch->pc); | |
1781 | ||
1782 | /* Set PC to the exception entry point */ | |
1783 | arch->pc = KVM_GUEST_KSEG0 + 0x180; | |
1784 | } else { | |
1785 | kvm_debug("[EXL == 1] Delivering TLB MISS @ pc %#lx\n", | |
1786 | arch->pc); | |
1787 | arch->pc = KVM_GUEST_KSEG0 + 0x180; | |
1788 | } | |
1789 | ||
1790 | kvm_change_c0_guest_cause(cop0, (0xff), | |
1791 | (T_TLB_ST_MISS << CAUSEB_EXCCODE)); | |
1792 | ||
1793 | /* setup badvaddr, context and entryhi registers for the guest */ | |
1794 | kvm_write_c0_guest_badvaddr(cop0, vcpu->arch.host_cp0_badvaddr); | |
1795 | /* XXXKYMA: is the context register used by linux??? */ | |
1796 | kvm_write_c0_guest_entryhi(cop0, entryhi); | |
1797 | /* Blow away the shadow host TLBs */ | |
1798 | kvm_mips_flush_host_tlb(1); | |
1799 | ||
d98403a5 | 1800 | return EMULATE_DONE; |
e685c689 SL |
1801 | } |
1802 | ||
1803 | /* TLBMOD: store into address matching TLB with Dirty bit off */ | |
d116e812 DCZ |
1804 | enum emulation_result kvm_mips_handle_tlbmod(unsigned long cause, uint32_t *opc, |
1805 | struct kvm_run *run, | |
1806 | struct kvm_vcpu *vcpu) | |
e685c689 SL |
1807 | { |
1808 | enum emulation_result er = EMULATE_DONE; | |
e685c689 | 1809 | #ifdef DEBUG |
3d654833 JH |
1810 | struct mips_coproc *cop0 = vcpu->arch.cop0; |
1811 | unsigned long entryhi = (vcpu->arch.host_cp0_badvaddr & VPN2_MASK) | | |
1812 | (kvm_read_c0_guest_entryhi(cop0) & ASID_MASK); | |
1813 | int index; | |
1814 | ||
d116e812 | 1815 | /* If address not in the guest TLB, then we are in trouble */ |
e685c689 SL |
1816 | index = kvm_mips_guest_tlb_lookup(vcpu, entryhi); |
1817 | if (index < 0) { | |
1818 | /* XXXKYMA Invalidate and retry */ | |
1819 | kvm_mips_host_tlb_inv(vcpu, vcpu->arch.host_cp0_badvaddr); | |
1820 | kvm_err("%s: host got TLBMOD for %#lx but entry not present in Guest TLB\n", | |
1821 | __func__, entryhi); | |
1822 | kvm_mips_dump_guest_tlbs(vcpu); | |
1823 | kvm_mips_dump_host_tlbs(); | |
1824 | return EMULATE_FAIL; | |
1825 | } | |
1826 | #endif | |
1827 | ||
1828 | er = kvm_mips_emulate_tlbmod(cause, opc, run, vcpu); | |
1829 | return er; | |
1830 | } | |
1831 | ||
d116e812 DCZ |
1832 | enum emulation_result kvm_mips_emulate_tlbmod(unsigned long cause, |
1833 | uint32_t *opc, | |
1834 | struct kvm_run *run, | |
1835 | struct kvm_vcpu *vcpu) | |
e685c689 SL |
1836 | { |
1837 | struct mips_coproc *cop0 = vcpu->arch.cop0; | |
1838 | unsigned long entryhi = (vcpu->arch.host_cp0_badvaddr & VPN2_MASK) | | |
48c4ac97 | 1839 | (kvm_read_c0_guest_entryhi(cop0) & ASID_MASK); |
e685c689 | 1840 | struct kvm_vcpu_arch *arch = &vcpu->arch; |
e685c689 SL |
1841 | |
1842 | if ((kvm_read_c0_guest_status(cop0) & ST0_EXL) == 0) { | |
1843 | /* save old pc */ | |
1844 | kvm_write_c0_guest_epc(cop0, arch->pc); | |
1845 | kvm_set_c0_guest_status(cop0, ST0_EXL); | |
1846 | ||
1847 | if (cause & CAUSEF_BD) | |
1848 | kvm_set_c0_guest_cause(cop0, CAUSEF_BD); | |
1849 | else | |
1850 | kvm_clear_c0_guest_cause(cop0, CAUSEF_BD); | |
1851 | ||
1852 | kvm_debug("[EXL == 0] Delivering TLB MOD @ pc %#lx\n", | |
1853 | arch->pc); | |
1854 | ||
1855 | arch->pc = KVM_GUEST_KSEG0 + 0x180; | |
1856 | } else { | |
1857 | kvm_debug("[EXL == 1] Delivering TLB MOD @ pc %#lx\n", | |
1858 | arch->pc); | |
1859 | arch->pc = KVM_GUEST_KSEG0 + 0x180; | |
1860 | } | |
1861 | ||
1862 | kvm_change_c0_guest_cause(cop0, (0xff), (T_TLB_MOD << CAUSEB_EXCCODE)); | |
1863 | ||
1864 | /* setup badvaddr, context and entryhi registers for the guest */ | |
1865 | kvm_write_c0_guest_badvaddr(cop0, vcpu->arch.host_cp0_badvaddr); | |
1866 | /* XXXKYMA: is the context register used by linux??? */ | |
1867 | kvm_write_c0_guest_entryhi(cop0, entryhi); | |
1868 | /* Blow away the shadow host TLBs */ | |
1869 | kvm_mips_flush_host_tlb(1); | |
1870 | ||
d98403a5 | 1871 | return EMULATE_DONE; |
e685c689 SL |
1872 | } |
1873 | ||
d116e812 DCZ |
1874 | enum emulation_result kvm_mips_emulate_fpu_exc(unsigned long cause, |
1875 | uint32_t *opc, | |
1876 | struct kvm_run *run, | |
1877 | struct kvm_vcpu *vcpu) | |
e685c689 SL |
1878 | { |
1879 | struct mips_coproc *cop0 = vcpu->arch.cop0; | |
1880 | struct kvm_vcpu_arch *arch = &vcpu->arch; | |
e685c689 SL |
1881 | |
1882 | if ((kvm_read_c0_guest_status(cop0) & ST0_EXL) == 0) { | |
1883 | /* save old pc */ | |
1884 | kvm_write_c0_guest_epc(cop0, arch->pc); | |
1885 | kvm_set_c0_guest_status(cop0, ST0_EXL); | |
1886 | ||
1887 | if (cause & CAUSEF_BD) | |
1888 | kvm_set_c0_guest_cause(cop0, CAUSEF_BD); | |
1889 | else | |
1890 | kvm_clear_c0_guest_cause(cop0, CAUSEF_BD); | |
1891 | ||
1892 | } | |
1893 | ||
1894 | arch->pc = KVM_GUEST_KSEG0 + 0x180; | |
1895 | ||
1896 | kvm_change_c0_guest_cause(cop0, (0xff), | |
1897 | (T_COP_UNUSABLE << CAUSEB_EXCCODE)); | |
1898 | kvm_change_c0_guest_cause(cop0, (CAUSEF_CE), (0x1 << CAUSEB_CE)); | |
1899 | ||
d98403a5 | 1900 | return EMULATE_DONE; |
e685c689 SL |
1901 | } |
1902 | ||
d116e812 DCZ |
1903 | enum emulation_result kvm_mips_emulate_ri_exc(unsigned long cause, |
1904 | uint32_t *opc, | |
1905 | struct kvm_run *run, | |
1906 | struct kvm_vcpu *vcpu) | |
e685c689 SL |
1907 | { |
1908 | struct mips_coproc *cop0 = vcpu->arch.cop0; | |
1909 | struct kvm_vcpu_arch *arch = &vcpu->arch; | |
1910 | enum emulation_result er = EMULATE_DONE; | |
1911 | ||
1912 | if ((kvm_read_c0_guest_status(cop0) & ST0_EXL) == 0) { | |
1913 | /* save old pc */ | |
1914 | kvm_write_c0_guest_epc(cop0, arch->pc); | |
1915 | kvm_set_c0_guest_status(cop0, ST0_EXL); | |
1916 | ||
1917 | if (cause & CAUSEF_BD) | |
1918 | kvm_set_c0_guest_cause(cop0, CAUSEF_BD); | |
1919 | else | |
1920 | kvm_clear_c0_guest_cause(cop0, CAUSEF_BD); | |
1921 | ||
1922 | kvm_debug("Delivering RI @ pc %#lx\n", arch->pc); | |
1923 | ||
1924 | kvm_change_c0_guest_cause(cop0, (0xff), | |
1925 | (T_RES_INST << CAUSEB_EXCCODE)); | |
1926 | ||
1927 | /* Set PC to the exception entry point */ | |
1928 | arch->pc = KVM_GUEST_KSEG0 + 0x180; | |
1929 | ||
1930 | } else { | |
1931 | kvm_err("Trying to deliver RI when EXL is already set\n"); | |
1932 | er = EMULATE_FAIL; | |
1933 | } | |
1934 | ||
1935 | return er; | |
1936 | } | |
1937 | ||
d116e812 DCZ |
1938 | enum emulation_result kvm_mips_emulate_bp_exc(unsigned long cause, |
1939 | uint32_t *opc, | |
1940 | struct kvm_run *run, | |
1941 | struct kvm_vcpu *vcpu) | |
e685c689 SL |
1942 | { |
1943 | struct mips_coproc *cop0 = vcpu->arch.cop0; | |
1944 | struct kvm_vcpu_arch *arch = &vcpu->arch; | |
1945 | enum emulation_result er = EMULATE_DONE; | |
1946 | ||
1947 | if ((kvm_read_c0_guest_status(cop0) & ST0_EXL) == 0) { | |
1948 | /* save old pc */ | |
1949 | kvm_write_c0_guest_epc(cop0, arch->pc); | |
1950 | kvm_set_c0_guest_status(cop0, ST0_EXL); | |
1951 | ||
1952 | if (cause & CAUSEF_BD) | |
1953 | kvm_set_c0_guest_cause(cop0, CAUSEF_BD); | |
1954 | else | |
1955 | kvm_clear_c0_guest_cause(cop0, CAUSEF_BD); | |
1956 | ||
1957 | kvm_debug("Delivering BP @ pc %#lx\n", arch->pc); | |
1958 | ||
1959 | kvm_change_c0_guest_cause(cop0, (0xff), | |
1960 | (T_BREAK << CAUSEB_EXCCODE)); | |
1961 | ||
1962 | /* Set PC to the exception entry point */ | |
1963 | arch->pc = KVM_GUEST_KSEG0 + 0x180; | |
1964 | ||
1965 | } else { | |
6ad78a5c | 1966 | kvm_err("Trying to deliver BP when EXL is already set\n"); |
e685c689 SL |
1967 | er = EMULATE_FAIL; |
1968 | } | |
1969 | ||
1970 | return er; | |
1971 | } | |
1972 | ||
d116e812 | 1973 | /* ll/sc, rdhwr, sync emulation */ |
e685c689 SL |
1974 | |
1975 | #define OPCODE 0xfc000000 | |
1976 | #define BASE 0x03e00000 | |
1977 | #define RT 0x001f0000 | |
1978 | #define OFFSET 0x0000ffff | |
1979 | #define LL 0xc0000000 | |
1980 | #define SC 0xe0000000 | |
1981 | #define SPEC0 0x00000000 | |
1982 | #define SPEC3 0x7c000000 | |
1983 | #define RD 0x0000f800 | |
1984 | #define FUNC 0x0000003f | |
1985 | #define SYNC 0x0000000f | |
1986 | #define RDHWR 0x0000003b | |
1987 | ||
d116e812 DCZ |
1988 | enum emulation_result kvm_mips_handle_ri(unsigned long cause, uint32_t *opc, |
1989 | struct kvm_run *run, | |
1990 | struct kvm_vcpu *vcpu) | |
e685c689 SL |
1991 | { |
1992 | struct mips_coproc *cop0 = vcpu->arch.cop0; | |
1993 | struct kvm_vcpu_arch *arch = &vcpu->arch; | |
1994 | enum emulation_result er = EMULATE_DONE; | |
1995 | unsigned long curr_pc; | |
1996 | uint32_t inst; | |
1997 | ||
1998 | /* | |
1999 | * Update PC and hold onto current PC in case there is | |
2000 | * an error and we want to rollback the PC | |
2001 | */ | |
2002 | curr_pc = vcpu->arch.pc; | |
2003 | er = update_pc(vcpu, cause); | |
2004 | if (er == EMULATE_FAIL) | |
2005 | return er; | |
2006 | ||
d116e812 | 2007 | /* Fetch the instruction. */ |
e685c689 SL |
2008 | if (cause & CAUSEF_BD) |
2009 | opc += 1; | |
2010 | ||
2011 | inst = kvm_get_inst(opc, vcpu); | |
2012 | ||
2013 | if (inst == KVM_INVALID_INST) { | |
6ad78a5c | 2014 | kvm_err("%s: Cannot get inst @ %p\n", __func__, opc); |
e685c689 SL |
2015 | return EMULATE_FAIL; |
2016 | } | |
2017 | ||
2018 | if ((inst & OPCODE) == SPEC3 && (inst & FUNC) == RDHWR) { | |
26f4f3b5 | 2019 | int usermode = !KVM_GUEST_KERNEL_MODE(vcpu); |
e685c689 SL |
2020 | int rd = (inst & RD) >> 11; |
2021 | int rt = (inst & RT) >> 16; | |
26f4f3b5 JH |
2022 | /* If usermode, check RDHWR rd is allowed by guest HWREna */ |
2023 | if (usermode && !(kvm_read_c0_guest_hwrena(cop0) & BIT(rd))) { | |
2024 | kvm_debug("RDHWR %#x disallowed by HWREna @ %p\n", | |
2025 | rd, opc); | |
2026 | goto emulate_ri; | |
2027 | } | |
e685c689 SL |
2028 | switch (rd) { |
2029 | case 0: /* CPU number */ | |
2030 | arch->gprs[rt] = 0; | |
2031 | break; | |
2032 | case 1: /* SYNCI length */ | |
2033 | arch->gprs[rt] = min(current_cpu_data.dcache.linesz, | |
2034 | current_cpu_data.icache.linesz); | |
2035 | break; | |
2036 | case 2: /* Read count register */ | |
e30492bb | 2037 | arch->gprs[rt] = kvm_mips_read_count(vcpu); |
e685c689 SL |
2038 | break; |
2039 | case 3: /* Count register resolution */ | |
2040 | switch (current_cpu_data.cputype) { | |
2041 | case CPU_20KC: | |
2042 | case CPU_25KF: | |
2043 | arch->gprs[rt] = 1; | |
2044 | break; | |
2045 | default: | |
2046 | arch->gprs[rt] = 2; | |
2047 | } | |
2048 | break; | |
2049 | case 29: | |
e685c689 | 2050 | arch->gprs[rt] = kvm_read_c0_guest_userlocal(cop0); |
e685c689 SL |
2051 | break; |
2052 | ||
2053 | default: | |
15505679 | 2054 | kvm_debug("RDHWR %#x not supported @ %p\n", rd, opc); |
26f4f3b5 | 2055 | goto emulate_ri; |
e685c689 SL |
2056 | } |
2057 | } else { | |
15505679 | 2058 | kvm_debug("Emulate RI not supported @ %p: %#x\n", opc, inst); |
26f4f3b5 | 2059 | goto emulate_ri; |
e685c689 SL |
2060 | } |
2061 | ||
26f4f3b5 JH |
2062 | return EMULATE_DONE; |
2063 | ||
2064 | emulate_ri: | |
e685c689 | 2065 | /* |
26f4f3b5 JH |
2066 | * Rollback PC (if in branch delay slot then the PC already points to |
2067 | * branch target), and pass the RI exception to the guest OS. | |
e685c689 | 2068 | */ |
26f4f3b5 JH |
2069 | vcpu->arch.pc = curr_pc; |
2070 | return kvm_mips_emulate_ri_exc(cause, opc, run, vcpu); | |
e685c689 SL |
2071 | } |
2072 | ||
d116e812 DCZ |
2073 | enum emulation_result kvm_mips_complete_mmio_load(struct kvm_vcpu *vcpu, |
2074 | struct kvm_run *run) | |
e685c689 SL |
2075 | { |
2076 | unsigned long *gpr = &vcpu->arch.gprs[vcpu->arch.io_gpr]; | |
2077 | enum emulation_result er = EMULATE_DONE; | |
2078 | unsigned long curr_pc; | |
2079 | ||
2080 | if (run->mmio.len > sizeof(*gpr)) { | |
6ad78a5c | 2081 | kvm_err("Bad MMIO length: %d", run->mmio.len); |
e685c689 SL |
2082 | er = EMULATE_FAIL; |
2083 | goto done; | |
2084 | } | |
2085 | ||
2086 | /* | |
2087 | * Update PC and hold onto current PC in case there is | |
2088 | * an error and we want to rollback the PC | |
2089 | */ | |
2090 | curr_pc = vcpu->arch.pc; | |
2091 | er = update_pc(vcpu, vcpu->arch.pending_load_cause); | |
2092 | if (er == EMULATE_FAIL) | |
2093 | return er; | |
2094 | ||
2095 | switch (run->mmio.len) { | |
2096 | case 4: | |
2097 | *gpr = *(int32_t *) run->mmio.data; | |
2098 | break; | |
2099 | ||
2100 | case 2: | |
2101 | if (vcpu->mmio_needed == 2) | |
2102 | *gpr = *(int16_t *) run->mmio.data; | |
2103 | else | |
2104 | *gpr = *(int16_t *) run->mmio.data; | |
2105 | ||
2106 | break; | |
2107 | case 1: | |
2108 | if (vcpu->mmio_needed == 2) | |
2109 | *gpr = *(int8_t *) run->mmio.data; | |
2110 | else | |
2111 | *gpr = *(u8 *) run->mmio.data; | |
2112 | break; | |
2113 | } | |
2114 | ||
2115 | if (vcpu->arch.pending_load_cause & CAUSEF_BD) | |
d116e812 DCZ |
2116 | kvm_debug("[%#lx] Completing %d byte BD Load to gpr %d (0x%08lx) type %d\n", |
2117 | vcpu->arch.pc, run->mmio.len, vcpu->arch.io_gpr, *gpr, | |
2118 | vcpu->mmio_needed); | |
e685c689 SL |
2119 | |
2120 | done: | |
2121 | return er; | |
2122 | } | |
2123 | ||
d116e812 DCZ |
2124 | static enum emulation_result kvm_mips_emulate_exc(unsigned long cause, |
2125 | uint32_t *opc, | |
2126 | struct kvm_run *run, | |
2127 | struct kvm_vcpu *vcpu) | |
e685c689 SL |
2128 | { |
2129 | uint32_t exccode = (cause >> CAUSEB_EXCCODE) & 0x1f; | |
2130 | struct mips_coproc *cop0 = vcpu->arch.cop0; | |
2131 | struct kvm_vcpu_arch *arch = &vcpu->arch; | |
2132 | enum emulation_result er = EMULATE_DONE; | |
2133 | ||
2134 | if ((kvm_read_c0_guest_status(cop0) & ST0_EXL) == 0) { | |
2135 | /* save old pc */ | |
2136 | kvm_write_c0_guest_epc(cop0, arch->pc); | |
2137 | kvm_set_c0_guest_status(cop0, ST0_EXL); | |
2138 | ||
2139 | if (cause & CAUSEF_BD) | |
2140 | kvm_set_c0_guest_cause(cop0, CAUSEF_BD); | |
2141 | else | |
2142 | kvm_clear_c0_guest_cause(cop0, CAUSEF_BD); | |
2143 | ||
2144 | kvm_change_c0_guest_cause(cop0, (0xff), | |
2145 | (exccode << CAUSEB_EXCCODE)); | |
2146 | ||
2147 | /* Set PC to the exception entry point */ | |
2148 | arch->pc = KVM_GUEST_KSEG0 + 0x180; | |
2149 | kvm_write_c0_guest_badvaddr(cop0, vcpu->arch.host_cp0_badvaddr); | |
2150 | ||
2151 | kvm_debug("Delivering EXC %d @ pc %#lx, badVaddr: %#lx\n", | |
2152 | exccode, kvm_read_c0_guest_epc(cop0), | |
2153 | kvm_read_c0_guest_badvaddr(cop0)); | |
2154 | } else { | |
6ad78a5c | 2155 | kvm_err("Trying to deliver EXC when EXL is already set\n"); |
e685c689 SL |
2156 | er = EMULATE_FAIL; |
2157 | } | |
2158 | ||
2159 | return er; | |
2160 | } | |
2161 | ||
d116e812 DCZ |
2162 | enum emulation_result kvm_mips_check_privilege(unsigned long cause, |
2163 | uint32_t *opc, | |
2164 | struct kvm_run *run, | |
2165 | struct kvm_vcpu *vcpu) | |
e685c689 SL |
2166 | { |
2167 | enum emulation_result er = EMULATE_DONE; | |
2168 | uint32_t exccode = (cause >> CAUSEB_EXCCODE) & 0x1f; | |
2169 | unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr; | |
2170 | ||
2171 | int usermode = !KVM_GUEST_KERNEL_MODE(vcpu); | |
2172 | ||
2173 | if (usermode) { | |
2174 | switch (exccode) { | |
2175 | case T_INT: | |
2176 | case T_SYSCALL: | |
2177 | case T_BREAK: | |
2178 | case T_RES_INST: | |
2179 | break; | |
2180 | ||
2181 | case T_COP_UNUSABLE: | |
2182 | if (((cause & CAUSEF_CE) >> CAUSEB_CE) == 0) | |
2183 | er = EMULATE_PRIV_FAIL; | |
2184 | break; | |
2185 | ||
2186 | case T_TLB_MOD: | |
2187 | break; | |
2188 | ||
2189 | case T_TLB_LD_MISS: | |
d116e812 DCZ |
2190 | /* |
2191 | * We we are accessing Guest kernel space, then send an | |
2192 | * address error exception to the guest | |
2193 | */ | |
e685c689 | 2194 | if (badvaddr >= (unsigned long) KVM_GUEST_KSEG0) { |
6ad78a5c DCZ |
2195 | kvm_debug("%s: LD MISS @ %#lx\n", __func__, |
2196 | badvaddr); | |
e685c689 SL |
2197 | cause &= ~0xff; |
2198 | cause |= (T_ADDR_ERR_LD << CAUSEB_EXCCODE); | |
2199 | er = EMULATE_PRIV_FAIL; | |
2200 | } | |
2201 | break; | |
2202 | ||
2203 | case T_TLB_ST_MISS: | |
d116e812 DCZ |
2204 | /* |
2205 | * We we are accessing Guest kernel space, then send an | |
2206 | * address error exception to the guest | |
2207 | */ | |
e685c689 | 2208 | if (badvaddr >= (unsigned long) KVM_GUEST_KSEG0) { |
6ad78a5c DCZ |
2209 | kvm_debug("%s: ST MISS @ %#lx\n", __func__, |
2210 | badvaddr); | |
e685c689 SL |
2211 | cause &= ~0xff; |
2212 | cause |= (T_ADDR_ERR_ST << CAUSEB_EXCCODE); | |
2213 | er = EMULATE_PRIV_FAIL; | |
2214 | } | |
2215 | break; | |
2216 | ||
2217 | case T_ADDR_ERR_ST: | |
6ad78a5c DCZ |
2218 | kvm_debug("%s: address error ST @ %#lx\n", __func__, |
2219 | badvaddr); | |
e685c689 SL |
2220 | if ((badvaddr & PAGE_MASK) == KVM_GUEST_COMMPAGE_ADDR) { |
2221 | cause &= ~0xff; | |
2222 | cause |= (T_TLB_ST_MISS << CAUSEB_EXCCODE); | |
2223 | } | |
2224 | er = EMULATE_PRIV_FAIL; | |
2225 | break; | |
2226 | case T_ADDR_ERR_LD: | |
6ad78a5c DCZ |
2227 | kvm_debug("%s: address error LD @ %#lx\n", __func__, |
2228 | badvaddr); | |
e685c689 SL |
2229 | if ((badvaddr & PAGE_MASK) == KVM_GUEST_COMMPAGE_ADDR) { |
2230 | cause &= ~0xff; | |
2231 | cause |= (T_TLB_LD_MISS << CAUSEB_EXCCODE); | |
2232 | } | |
2233 | er = EMULATE_PRIV_FAIL; | |
2234 | break; | |
2235 | default: | |
2236 | er = EMULATE_PRIV_FAIL; | |
2237 | break; | |
2238 | } | |
2239 | } | |
2240 | ||
d116e812 | 2241 | if (er == EMULATE_PRIV_FAIL) |
e685c689 | 2242 | kvm_mips_emulate_exc(cause, opc, run, vcpu); |
d116e812 | 2243 | |
e685c689 SL |
2244 | return er; |
2245 | } | |
2246 | ||
d116e812 DCZ |
2247 | /* |
2248 | * User Address (UA) fault, this could happen if | |
e685c689 SL |
2249 | * (1) TLB entry not present/valid in both Guest and shadow host TLBs, in this |
2250 | * case we pass on the fault to the guest kernel and let it handle it. | |
2251 | * (2) TLB entry is present in the Guest TLB but not in the shadow, in this | |
2252 | * case we inject the TLB from the Guest TLB into the shadow host TLB | |
2253 | */ | |
d116e812 DCZ |
2254 | enum emulation_result kvm_mips_handle_tlbmiss(unsigned long cause, |
2255 | uint32_t *opc, | |
2256 | struct kvm_run *run, | |
2257 | struct kvm_vcpu *vcpu) | |
e685c689 SL |
2258 | { |
2259 | enum emulation_result er = EMULATE_DONE; | |
2260 | uint32_t exccode = (cause >> CAUSEB_EXCCODE) & 0x1f; | |
2261 | unsigned long va = vcpu->arch.host_cp0_badvaddr; | |
2262 | int index; | |
2263 | ||
2264 | kvm_debug("kvm_mips_handle_tlbmiss: badvaddr: %#lx, entryhi: %#lx\n", | |
2265 | vcpu->arch.host_cp0_badvaddr, vcpu->arch.host_cp0_entryhi); | |
2266 | ||
d116e812 DCZ |
2267 | /* |
2268 | * KVM would not have got the exception if this entry was valid in the | |
2269 | * shadow host TLB. Check the Guest TLB, if the entry is not there then | |
2270 | * send the guest an exception. The guest exc handler should then inject | |
2271 | * an entry into the guest TLB. | |
e685c689 SL |
2272 | */ |
2273 | index = kvm_mips_guest_tlb_lookup(vcpu, | |
2274 | (va & VPN2_MASK) | | |
48c4ac97 DD |
2275 | (kvm_read_c0_guest_entryhi |
2276 | (vcpu->arch.cop0) & ASID_MASK)); | |
e685c689 SL |
2277 | if (index < 0) { |
2278 | if (exccode == T_TLB_LD_MISS) { | |
2279 | er = kvm_mips_emulate_tlbmiss_ld(cause, opc, run, vcpu); | |
2280 | } else if (exccode == T_TLB_ST_MISS) { | |
2281 | er = kvm_mips_emulate_tlbmiss_st(cause, opc, run, vcpu); | |
2282 | } else { | |
6ad78a5c DCZ |
2283 | kvm_err("%s: invalid exc code: %d\n", __func__, |
2284 | exccode); | |
e685c689 SL |
2285 | er = EMULATE_FAIL; |
2286 | } | |
2287 | } else { | |
2288 | struct kvm_mips_tlb *tlb = &vcpu->arch.guest_tlb[index]; | |
2289 | ||
d116e812 DCZ |
2290 | /* |
2291 | * Check if the entry is valid, if not then setup a TLB invalid | |
2292 | * exception to the guest | |
2293 | */ | |
e685c689 SL |
2294 | if (!TLB_IS_VALID(*tlb, va)) { |
2295 | if (exccode == T_TLB_LD_MISS) { | |
2296 | er = kvm_mips_emulate_tlbinv_ld(cause, opc, run, | |
2297 | vcpu); | |
2298 | } else if (exccode == T_TLB_ST_MISS) { | |
2299 | er = kvm_mips_emulate_tlbinv_st(cause, opc, run, | |
2300 | vcpu); | |
2301 | } else { | |
6ad78a5c DCZ |
2302 | kvm_err("%s: invalid exc code: %d\n", __func__, |
2303 | exccode); | |
e685c689 SL |
2304 | er = EMULATE_FAIL; |
2305 | } | |
2306 | } else { | |
d116e812 DCZ |
2307 | kvm_debug("Injecting hi: %#lx, lo0: %#lx, lo1: %#lx into shadow host TLB\n", |
2308 | tlb->tlb_hi, tlb->tlb_lo0, tlb->tlb_lo1); | |
2309 | /* | |
2310 | * OK we have a Guest TLB entry, now inject it into the | |
2311 | * shadow host TLB | |
2312 | */ | |
e685c689 SL |
2313 | kvm_mips_handle_mapped_seg_tlb_fault(vcpu, tlb, NULL, |
2314 | NULL); | |
2315 | } | |
2316 | } | |
2317 | ||
2318 | return er; | |
2319 | } |