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KVM: local APIC TPR access reporting facility
[deliverable/linux.git] / arch / x86 / kvm / lapic.c
1
2 /*
3 * Local APIC virtualization
4 *
5 * Copyright (C) 2006 Qumranet, Inc.
6 * Copyright (C) 2007 Novell
7 * Copyright (C) 2007 Intel
8 *
9 * Authors:
10 * Dor Laor <dor.laor@qumranet.com>
11 * Gregory Haskins <ghaskins@novell.com>
12 * Yaozu (Eddie) Dong <eddie.dong@intel.com>
13 *
14 * Based on Xen 3.1 code, Copyright (c) 2004, Intel Corporation.
15 *
16 * This work is licensed under the terms of the GNU GPL, version 2. See
17 * the COPYING file in the top-level directory.
18 */
19
20 #include <linux/kvm_host.h>
21 #include <linux/kvm.h>
22 #include <linux/mm.h>
23 #include <linux/highmem.h>
24 #include <linux/smp.h>
25 #include <linux/hrtimer.h>
26 #include <linux/io.h>
27 #include <linux/module.h>
28 #include <asm/processor.h>
29 #include <asm/msr.h>
30 #include <asm/page.h>
31 #include <asm/current.h>
32 #include <asm/apicdef.h>
33 #include <asm/atomic.h>
34 #include <asm/div64.h>
35 #include "irq.h"
36
37 #define PRId64 "d"
38 #define PRIx64 "llx"
39 #define PRIu64 "u"
40 #define PRIo64 "o"
41
42 #define APIC_BUS_CYCLE_NS 1
43
44 /* #define apic_debug(fmt,arg...) printk(KERN_WARNING fmt,##arg) */
45 #define apic_debug(fmt, arg...)
46
47 #define APIC_LVT_NUM 6
48 /* 14 is the version for Xeon and Pentium 8.4.8*/
49 #define APIC_VERSION (0x14UL | ((APIC_LVT_NUM - 1) << 16))
50 #define LAPIC_MMIO_LENGTH (1 << 12)
51 /* followed define is not in apicdef.h */
52 #define APIC_SHORT_MASK 0xc0000
53 #define APIC_DEST_NOSHORT 0x0
54 #define APIC_DEST_MASK 0x800
55 #define MAX_APIC_VECTOR 256
56
57 #define VEC_POS(v) ((v) & (32 - 1))
58 #define REG_POS(v) (((v) >> 5) << 4)
59
60 static inline u32 apic_get_reg(struct kvm_lapic *apic, int reg_off)
61 {
62 return *((u32 *) (apic->regs + reg_off));
63 }
64
65 static inline void apic_set_reg(struct kvm_lapic *apic, int reg_off, u32 val)
66 {
67 *((u32 *) (apic->regs + reg_off)) = val;
68 }
69
70 static inline int apic_test_and_set_vector(int vec, void *bitmap)
71 {
72 return test_and_set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
73 }
74
75 static inline int apic_test_and_clear_vector(int vec, void *bitmap)
76 {
77 return test_and_clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
78 }
79
80 static inline void apic_set_vector(int vec, void *bitmap)
81 {
82 set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
83 }
84
85 static inline void apic_clear_vector(int vec, void *bitmap)
86 {
87 clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
88 }
89
90 static inline int apic_hw_enabled(struct kvm_lapic *apic)
91 {
92 return (apic)->vcpu->arch.apic_base & MSR_IA32_APICBASE_ENABLE;
93 }
94
95 static inline int apic_sw_enabled(struct kvm_lapic *apic)
96 {
97 return apic_get_reg(apic, APIC_SPIV) & APIC_SPIV_APIC_ENABLED;
98 }
99
100 static inline int apic_enabled(struct kvm_lapic *apic)
101 {
102 return apic_sw_enabled(apic) && apic_hw_enabled(apic);
103 }
104
105 #define LVT_MASK \
106 (APIC_LVT_MASKED | APIC_SEND_PENDING | APIC_VECTOR_MASK)
107
108 #define LINT_MASK \
109 (LVT_MASK | APIC_MODE_MASK | APIC_INPUT_POLARITY | \
110 APIC_LVT_REMOTE_IRR | APIC_LVT_LEVEL_TRIGGER)
111
112 static inline int kvm_apic_id(struct kvm_lapic *apic)
113 {
114 return (apic_get_reg(apic, APIC_ID) >> 24) & 0xff;
115 }
116
117 static inline int apic_lvt_enabled(struct kvm_lapic *apic, int lvt_type)
118 {
119 return !(apic_get_reg(apic, lvt_type) & APIC_LVT_MASKED);
120 }
121
122 static inline int apic_lvt_vector(struct kvm_lapic *apic, int lvt_type)
123 {
124 return apic_get_reg(apic, lvt_type) & APIC_VECTOR_MASK;
125 }
126
127 static inline int apic_lvtt_period(struct kvm_lapic *apic)
128 {
129 return apic_get_reg(apic, APIC_LVTT) & APIC_LVT_TIMER_PERIODIC;
130 }
131
132 static unsigned int apic_lvt_mask[APIC_LVT_NUM] = {
133 LVT_MASK | APIC_LVT_TIMER_PERIODIC, /* LVTT */
134 LVT_MASK | APIC_MODE_MASK, /* LVTTHMR */
135 LVT_MASK | APIC_MODE_MASK, /* LVTPC */
136 LINT_MASK, LINT_MASK, /* LVT0-1 */
137 LVT_MASK /* LVTERR */
138 };
139
140 static int find_highest_vector(void *bitmap)
141 {
142 u32 *word = bitmap;
143 int word_offset = MAX_APIC_VECTOR >> 5;
144
145 while ((word_offset != 0) && (word[(--word_offset) << 2] == 0))
146 continue;
147
148 if (likely(!word_offset && !word[0]))
149 return -1;
150 else
151 return fls(word[word_offset << 2]) - 1 + (word_offset << 5);
152 }
153
154 static inline int apic_test_and_set_irr(int vec, struct kvm_lapic *apic)
155 {
156 return apic_test_and_set_vector(vec, apic->regs + APIC_IRR);
157 }
158
159 static inline void apic_clear_irr(int vec, struct kvm_lapic *apic)
160 {
161 apic_clear_vector(vec, apic->regs + APIC_IRR);
162 }
163
164 static inline int apic_find_highest_irr(struct kvm_lapic *apic)
165 {
166 int result;
167
168 result = find_highest_vector(apic->regs + APIC_IRR);
169 ASSERT(result == -1 || result >= 16);
170
171 return result;
172 }
173
174 int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu)
175 {
176 struct kvm_lapic *apic = vcpu->arch.apic;
177 int highest_irr;
178
179 if (!apic)
180 return 0;
181 highest_irr = apic_find_highest_irr(apic);
182
183 return highest_irr;
184 }
185 EXPORT_SYMBOL_GPL(kvm_lapic_find_highest_irr);
186
187 int kvm_apic_set_irq(struct kvm_vcpu *vcpu, u8 vec, u8 trig)
188 {
189 struct kvm_lapic *apic = vcpu->arch.apic;
190
191 if (!apic_test_and_set_irr(vec, apic)) {
192 /* a new pending irq is set in IRR */
193 if (trig)
194 apic_set_vector(vec, apic->regs + APIC_TMR);
195 else
196 apic_clear_vector(vec, apic->regs + APIC_TMR);
197 kvm_vcpu_kick(apic->vcpu);
198 return 1;
199 }
200 return 0;
201 }
202
203 static inline int apic_find_highest_isr(struct kvm_lapic *apic)
204 {
205 int result;
206
207 result = find_highest_vector(apic->regs + APIC_ISR);
208 ASSERT(result == -1 || result >= 16);
209
210 return result;
211 }
212
213 static void apic_update_ppr(struct kvm_lapic *apic)
214 {
215 u32 tpr, isrv, ppr;
216 int isr;
217
218 tpr = apic_get_reg(apic, APIC_TASKPRI);
219 isr = apic_find_highest_isr(apic);
220 isrv = (isr != -1) ? isr : 0;
221
222 if ((tpr & 0xf0) >= (isrv & 0xf0))
223 ppr = tpr & 0xff;
224 else
225 ppr = isrv & 0xf0;
226
227 apic_debug("vlapic %p, ppr 0x%x, isr 0x%x, isrv 0x%x",
228 apic, ppr, isr, isrv);
229
230 apic_set_reg(apic, APIC_PROCPRI, ppr);
231 }
232
233 static void apic_set_tpr(struct kvm_lapic *apic, u32 tpr)
234 {
235 apic_set_reg(apic, APIC_TASKPRI, tpr);
236 apic_update_ppr(apic);
237 }
238
239 int kvm_apic_match_physical_addr(struct kvm_lapic *apic, u16 dest)
240 {
241 return kvm_apic_id(apic) == dest;
242 }
243
244 int kvm_apic_match_logical_addr(struct kvm_lapic *apic, u8 mda)
245 {
246 int result = 0;
247 u8 logical_id;
248
249 logical_id = GET_APIC_LOGICAL_ID(apic_get_reg(apic, APIC_LDR));
250
251 switch (apic_get_reg(apic, APIC_DFR)) {
252 case APIC_DFR_FLAT:
253 if (logical_id & mda)
254 result = 1;
255 break;
256 case APIC_DFR_CLUSTER:
257 if (((logical_id >> 4) == (mda >> 0x4))
258 && (logical_id & mda & 0xf))
259 result = 1;
260 break;
261 default:
262 printk(KERN_WARNING "Bad DFR vcpu %d: %08x\n",
263 apic->vcpu->vcpu_id, apic_get_reg(apic, APIC_DFR));
264 break;
265 }
266
267 return result;
268 }
269
270 static int apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
271 int short_hand, int dest, int dest_mode)
272 {
273 int result = 0;
274 struct kvm_lapic *target = vcpu->arch.apic;
275
276 apic_debug("target %p, source %p, dest 0x%x, "
277 "dest_mode 0x%x, short_hand 0x%x",
278 target, source, dest, dest_mode, short_hand);
279
280 ASSERT(!target);
281 switch (short_hand) {
282 case APIC_DEST_NOSHORT:
283 if (dest_mode == 0) {
284 /* Physical mode. */
285 if ((dest == 0xFF) || (dest == kvm_apic_id(target)))
286 result = 1;
287 } else
288 /* Logical mode. */
289 result = kvm_apic_match_logical_addr(target, dest);
290 break;
291 case APIC_DEST_SELF:
292 if (target == source)
293 result = 1;
294 break;
295 case APIC_DEST_ALLINC:
296 result = 1;
297 break;
298 case APIC_DEST_ALLBUT:
299 if (target != source)
300 result = 1;
301 break;
302 default:
303 printk(KERN_WARNING "Bad dest shorthand value %x\n",
304 short_hand);
305 break;
306 }
307
308 return result;
309 }
310
311 /*
312 * Add a pending IRQ into lapic.
313 * Return 1 if successfully added and 0 if discarded.
314 */
315 static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
316 int vector, int level, int trig_mode)
317 {
318 int orig_irr, result = 0;
319 struct kvm_vcpu *vcpu = apic->vcpu;
320
321 switch (delivery_mode) {
322 case APIC_DM_FIXED:
323 case APIC_DM_LOWEST:
324 /* FIXME add logic for vcpu on reset */
325 if (unlikely(!apic_enabled(apic)))
326 break;
327
328 orig_irr = apic_test_and_set_irr(vector, apic);
329 if (orig_irr && trig_mode) {
330 apic_debug("level trig mode repeatedly for vector %d",
331 vector);
332 break;
333 }
334
335 if (trig_mode) {
336 apic_debug("level trig mode for vector %d", vector);
337 apic_set_vector(vector, apic->regs + APIC_TMR);
338 } else
339 apic_clear_vector(vector, apic->regs + APIC_TMR);
340
341 if (vcpu->arch.mp_state == VCPU_MP_STATE_RUNNABLE)
342 kvm_vcpu_kick(vcpu);
343 else if (vcpu->arch.mp_state == VCPU_MP_STATE_HALTED) {
344 vcpu->arch.mp_state = VCPU_MP_STATE_RUNNABLE;
345 if (waitqueue_active(&vcpu->wq))
346 wake_up_interruptible(&vcpu->wq);
347 }
348
349 result = (orig_irr == 0);
350 break;
351
352 case APIC_DM_REMRD:
353 printk(KERN_DEBUG "Ignoring delivery mode 3\n");
354 break;
355
356 case APIC_DM_SMI:
357 printk(KERN_DEBUG "Ignoring guest SMI\n");
358 break;
359 case APIC_DM_NMI:
360 printk(KERN_DEBUG "Ignoring guest NMI\n");
361 break;
362
363 case APIC_DM_INIT:
364 if (level) {
365 if (vcpu->arch.mp_state == VCPU_MP_STATE_RUNNABLE)
366 printk(KERN_DEBUG
367 "INIT on a runnable vcpu %d\n",
368 vcpu->vcpu_id);
369 vcpu->arch.mp_state = VCPU_MP_STATE_INIT_RECEIVED;
370 kvm_vcpu_kick(vcpu);
371 } else {
372 printk(KERN_DEBUG
373 "Ignoring de-assert INIT to vcpu %d\n",
374 vcpu->vcpu_id);
375 }
376
377 break;
378
379 case APIC_DM_STARTUP:
380 printk(KERN_DEBUG "SIPI to vcpu %d vector 0x%02x\n",
381 vcpu->vcpu_id, vector);
382 if (vcpu->arch.mp_state == VCPU_MP_STATE_INIT_RECEIVED) {
383 vcpu->arch.sipi_vector = vector;
384 vcpu->arch.mp_state = VCPU_MP_STATE_SIPI_RECEIVED;
385 if (waitqueue_active(&vcpu->wq))
386 wake_up_interruptible(&vcpu->wq);
387 }
388 break;
389
390 default:
391 printk(KERN_ERR "TODO: unsupported delivery mode %x\n",
392 delivery_mode);
393 break;
394 }
395 return result;
396 }
397
398 static struct kvm_lapic *kvm_apic_round_robin(struct kvm *kvm, u8 vector,
399 unsigned long bitmap)
400 {
401 int last;
402 int next;
403 struct kvm_lapic *apic = NULL;
404
405 last = kvm->arch.round_robin_prev_vcpu;
406 next = last;
407
408 do {
409 if (++next == KVM_MAX_VCPUS)
410 next = 0;
411 if (kvm->vcpus[next] == NULL || !test_bit(next, &bitmap))
412 continue;
413 apic = kvm->vcpus[next]->arch.apic;
414 if (apic && apic_enabled(apic))
415 break;
416 apic = NULL;
417 } while (next != last);
418 kvm->arch.round_robin_prev_vcpu = next;
419
420 if (!apic)
421 printk(KERN_DEBUG "vcpu not ready for apic_round_robin\n");
422
423 return apic;
424 }
425
426 struct kvm_vcpu *kvm_get_lowest_prio_vcpu(struct kvm *kvm, u8 vector,
427 unsigned long bitmap)
428 {
429 struct kvm_lapic *apic;
430
431 apic = kvm_apic_round_robin(kvm, vector, bitmap);
432 if (apic)
433 return apic->vcpu;
434 return NULL;
435 }
436
437 static void apic_set_eoi(struct kvm_lapic *apic)
438 {
439 int vector = apic_find_highest_isr(apic);
440
441 /*
442 * Not every write EOI will has corresponding ISR,
443 * one example is when Kernel check timer on setup_IO_APIC
444 */
445 if (vector == -1)
446 return;
447
448 apic_clear_vector(vector, apic->regs + APIC_ISR);
449 apic_update_ppr(apic);
450
451 if (apic_test_and_clear_vector(vector, apic->regs + APIC_TMR))
452 kvm_ioapic_update_eoi(apic->vcpu->kvm, vector);
453 }
454
455 static void apic_send_ipi(struct kvm_lapic *apic)
456 {
457 u32 icr_low = apic_get_reg(apic, APIC_ICR);
458 u32 icr_high = apic_get_reg(apic, APIC_ICR2);
459
460 unsigned int dest = GET_APIC_DEST_FIELD(icr_high);
461 unsigned int short_hand = icr_low & APIC_SHORT_MASK;
462 unsigned int trig_mode = icr_low & APIC_INT_LEVELTRIG;
463 unsigned int level = icr_low & APIC_INT_ASSERT;
464 unsigned int dest_mode = icr_low & APIC_DEST_MASK;
465 unsigned int delivery_mode = icr_low & APIC_MODE_MASK;
466 unsigned int vector = icr_low & APIC_VECTOR_MASK;
467
468 struct kvm_vcpu *target;
469 struct kvm_vcpu *vcpu;
470 unsigned long lpr_map = 0;
471 int i;
472
473 apic_debug("icr_high 0x%x, icr_low 0x%x, "
474 "short_hand 0x%x, dest 0x%x, trig_mode 0x%x, level 0x%x, "
475 "dest_mode 0x%x, delivery_mode 0x%x, vector 0x%x\n",
476 icr_high, icr_low, short_hand, dest,
477 trig_mode, level, dest_mode, delivery_mode, vector);
478
479 for (i = 0; i < KVM_MAX_VCPUS; i++) {
480 vcpu = apic->vcpu->kvm->vcpus[i];
481 if (!vcpu)
482 continue;
483
484 if (vcpu->arch.apic &&
485 apic_match_dest(vcpu, apic, short_hand, dest, dest_mode)) {
486 if (delivery_mode == APIC_DM_LOWEST)
487 set_bit(vcpu->vcpu_id, &lpr_map);
488 else
489 __apic_accept_irq(vcpu->arch.apic, delivery_mode,
490 vector, level, trig_mode);
491 }
492 }
493
494 if (delivery_mode == APIC_DM_LOWEST) {
495 target = kvm_get_lowest_prio_vcpu(vcpu->kvm, vector, lpr_map);
496 if (target != NULL)
497 __apic_accept_irq(target->arch.apic, delivery_mode,
498 vector, level, trig_mode);
499 }
500 }
501
502 static u32 apic_get_tmcct(struct kvm_lapic *apic)
503 {
504 u64 counter_passed;
505 ktime_t passed, now;
506 u32 tmcct;
507
508 ASSERT(apic != NULL);
509
510 now = apic->timer.dev.base->get_time();
511 tmcct = apic_get_reg(apic, APIC_TMICT);
512
513 /* if initial count is 0, current count should also be 0 */
514 if (tmcct == 0)
515 return 0;
516
517 if (unlikely(ktime_to_ns(now) <=
518 ktime_to_ns(apic->timer.last_update))) {
519 /* Wrap around */
520 passed = ktime_add(( {
521 (ktime_t) {
522 .tv64 = KTIME_MAX -
523 (apic->timer.last_update).tv64}; }
524 ), now);
525 apic_debug("time elapsed\n");
526 } else
527 passed = ktime_sub(now, apic->timer.last_update);
528
529 counter_passed = div64_64(ktime_to_ns(passed),
530 (APIC_BUS_CYCLE_NS * apic->timer.divide_count));
531
532 if (counter_passed > tmcct) {
533 if (unlikely(!apic_lvtt_period(apic))) {
534 /* one-shot timers stick at 0 until reset */
535 tmcct = 0;
536 } else {
537 /*
538 * periodic timers reset to APIC_TMICT when they
539 * hit 0. The while loop simulates this happening N
540 * times. (counter_passed %= tmcct) would also work,
541 * but might be slower or not work on 32-bit??
542 */
543 while (counter_passed > tmcct)
544 counter_passed -= tmcct;
545 tmcct -= counter_passed;
546 }
547 } else {
548 tmcct -= counter_passed;
549 }
550
551 return tmcct;
552 }
553
554 static void __report_tpr_access(struct kvm_lapic *apic, bool write)
555 {
556 struct kvm_vcpu *vcpu = apic->vcpu;
557 struct kvm_run *run = vcpu->run;
558
559 set_bit(KVM_REQ_REPORT_TPR_ACCESS, &vcpu->requests);
560 kvm_x86_ops->cache_regs(vcpu);
561 run->tpr_access.rip = vcpu->arch.rip;
562 run->tpr_access.is_write = write;
563 }
564
565 static inline void report_tpr_access(struct kvm_lapic *apic, bool write)
566 {
567 if (apic->vcpu->arch.tpr_access_reporting)
568 __report_tpr_access(apic, write);
569 }
570
571 static u32 __apic_read(struct kvm_lapic *apic, unsigned int offset)
572 {
573 u32 val = 0;
574
575 if (offset >= LAPIC_MMIO_LENGTH)
576 return 0;
577
578 switch (offset) {
579 case APIC_ARBPRI:
580 printk(KERN_WARNING "Access APIC ARBPRI register "
581 "which is for P6\n");
582 break;
583
584 case APIC_TMCCT: /* Timer CCR */
585 val = apic_get_tmcct(apic);
586 break;
587
588 case APIC_TASKPRI:
589 report_tpr_access(apic, false);
590 /* fall thru */
591 default:
592 apic_update_ppr(apic);
593 val = apic_get_reg(apic, offset);
594 break;
595 }
596
597 return val;
598 }
599
600 static void apic_mmio_read(struct kvm_io_device *this,
601 gpa_t address, int len, void *data)
602 {
603 struct kvm_lapic *apic = (struct kvm_lapic *)this->private;
604 unsigned int offset = address - apic->base_address;
605 unsigned char alignment = offset & 0xf;
606 u32 result;
607
608 if ((alignment + len) > 4) {
609 printk(KERN_ERR "KVM_APIC_READ: alignment error %lx %d",
610 (unsigned long)address, len);
611 return;
612 }
613 result = __apic_read(apic, offset & ~0xf);
614
615 switch (len) {
616 case 1:
617 case 2:
618 case 4:
619 memcpy(data, (char *)&result + alignment, len);
620 break;
621 default:
622 printk(KERN_ERR "Local APIC read with len = %x, "
623 "should be 1,2, or 4 instead\n", len);
624 break;
625 }
626 }
627
628 static void update_divide_count(struct kvm_lapic *apic)
629 {
630 u32 tmp1, tmp2, tdcr;
631
632 tdcr = apic_get_reg(apic, APIC_TDCR);
633 tmp1 = tdcr & 0xf;
634 tmp2 = ((tmp1 & 0x3) | ((tmp1 & 0x8) >> 1)) + 1;
635 apic->timer.divide_count = 0x1 << (tmp2 & 0x7);
636
637 apic_debug("timer divide count is 0x%x\n",
638 apic->timer.divide_count);
639 }
640
641 static void start_apic_timer(struct kvm_lapic *apic)
642 {
643 ktime_t now = apic->timer.dev.base->get_time();
644
645 apic->timer.last_update = now;
646
647 apic->timer.period = apic_get_reg(apic, APIC_TMICT) *
648 APIC_BUS_CYCLE_NS * apic->timer.divide_count;
649 atomic_set(&apic->timer.pending, 0);
650 hrtimer_start(&apic->timer.dev,
651 ktime_add_ns(now, apic->timer.period),
652 HRTIMER_MODE_ABS);
653
654 apic_debug("%s: bus cycle is %" PRId64 "ns, now 0x%016"
655 PRIx64 ", "
656 "timer initial count 0x%x, period %lldns, "
657 "expire @ 0x%016" PRIx64 ".\n", __FUNCTION__,
658 APIC_BUS_CYCLE_NS, ktime_to_ns(now),
659 apic_get_reg(apic, APIC_TMICT),
660 apic->timer.period,
661 ktime_to_ns(ktime_add_ns(now,
662 apic->timer.period)));
663 }
664
665 static void apic_mmio_write(struct kvm_io_device *this,
666 gpa_t address, int len, const void *data)
667 {
668 struct kvm_lapic *apic = (struct kvm_lapic *)this->private;
669 unsigned int offset = address - apic->base_address;
670 unsigned char alignment = offset & 0xf;
671 u32 val;
672
673 /*
674 * APIC register must be aligned on 128-bits boundary.
675 * 32/64/128 bits registers must be accessed thru 32 bits.
676 * Refer SDM 8.4.1
677 */
678 if (len != 4 || alignment) {
679 if (printk_ratelimit())
680 printk(KERN_ERR "apic write: bad size=%d %lx\n",
681 len, (long)address);
682 return;
683 }
684
685 val = *(u32 *) data;
686
687 /* too common printing */
688 if (offset != APIC_EOI)
689 apic_debug("%s: offset 0x%x with length 0x%x, and value is "
690 "0x%x\n", __FUNCTION__, offset, len, val);
691
692 offset &= 0xff0;
693
694 switch (offset) {
695 case APIC_ID: /* Local APIC ID */
696 apic_set_reg(apic, APIC_ID, val);
697 break;
698
699 case APIC_TASKPRI:
700 report_tpr_access(apic, true);
701 apic_set_tpr(apic, val & 0xff);
702 break;
703
704 case APIC_EOI:
705 apic_set_eoi(apic);
706 break;
707
708 case APIC_LDR:
709 apic_set_reg(apic, APIC_LDR, val & APIC_LDR_MASK);
710 break;
711
712 case APIC_DFR:
713 apic_set_reg(apic, APIC_DFR, val | 0x0FFFFFFF);
714 break;
715
716 case APIC_SPIV:
717 apic_set_reg(apic, APIC_SPIV, val & 0x3ff);
718 if (!(val & APIC_SPIV_APIC_ENABLED)) {
719 int i;
720 u32 lvt_val;
721
722 for (i = 0; i < APIC_LVT_NUM; i++) {
723 lvt_val = apic_get_reg(apic,
724 APIC_LVTT + 0x10 * i);
725 apic_set_reg(apic, APIC_LVTT + 0x10 * i,
726 lvt_val | APIC_LVT_MASKED);
727 }
728 atomic_set(&apic->timer.pending, 0);
729
730 }
731 break;
732
733 case APIC_ICR:
734 /* No delay here, so we always clear the pending bit */
735 apic_set_reg(apic, APIC_ICR, val & ~(1 << 12));
736 apic_send_ipi(apic);
737 break;
738
739 case APIC_ICR2:
740 apic_set_reg(apic, APIC_ICR2, val & 0xff000000);
741 break;
742
743 case APIC_LVTT:
744 case APIC_LVTTHMR:
745 case APIC_LVTPC:
746 case APIC_LVT0:
747 case APIC_LVT1:
748 case APIC_LVTERR:
749 /* TODO: Check vector */
750 if (!apic_sw_enabled(apic))
751 val |= APIC_LVT_MASKED;
752
753 val &= apic_lvt_mask[(offset - APIC_LVTT) >> 4];
754 apic_set_reg(apic, offset, val);
755
756 break;
757
758 case APIC_TMICT:
759 hrtimer_cancel(&apic->timer.dev);
760 apic_set_reg(apic, APIC_TMICT, val);
761 start_apic_timer(apic);
762 return;
763
764 case APIC_TDCR:
765 if (val & 4)
766 printk(KERN_ERR "KVM_WRITE:TDCR %x\n", val);
767 apic_set_reg(apic, APIC_TDCR, val);
768 update_divide_count(apic);
769 break;
770
771 default:
772 apic_debug("Local APIC Write to read-only register %x\n",
773 offset);
774 break;
775 }
776
777 }
778
779 static int apic_mmio_range(struct kvm_io_device *this, gpa_t addr)
780 {
781 struct kvm_lapic *apic = (struct kvm_lapic *)this->private;
782 int ret = 0;
783
784
785 if (apic_hw_enabled(apic) &&
786 (addr >= apic->base_address) &&
787 (addr < (apic->base_address + LAPIC_MMIO_LENGTH)))
788 ret = 1;
789
790 return ret;
791 }
792
793 void kvm_free_lapic(struct kvm_vcpu *vcpu)
794 {
795 if (!vcpu->arch.apic)
796 return;
797
798 hrtimer_cancel(&vcpu->arch.apic->timer.dev);
799
800 if (vcpu->arch.apic->regs_page)
801 __free_page(vcpu->arch.apic->regs_page);
802
803 kfree(vcpu->arch.apic);
804 }
805
806 /*
807 *----------------------------------------------------------------------
808 * LAPIC interface
809 *----------------------------------------------------------------------
810 */
811
812 void kvm_lapic_set_tpr(struct kvm_vcpu *vcpu, unsigned long cr8)
813 {
814 struct kvm_lapic *apic = vcpu->arch.apic;
815
816 if (!apic)
817 return;
818 apic_set_tpr(apic, ((cr8 & 0x0f) << 4));
819 }
820
821 u64 kvm_lapic_get_cr8(struct kvm_vcpu *vcpu)
822 {
823 struct kvm_lapic *apic = vcpu->arch.apic;
824 u64 tpr;
825
826 if (!apic)
827 return 0;
828 tpr = (u64) apic_get_reg(apic, APIC_TASKPRI);
829
830 return (tpr & 0xf0) >> 4;
831 }
832 EXPORT_SYMBOL_GPL(kvm_lapic_get_cr8);
833
834 void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value)
835 {
836 struct kvm_lapic *apic = vcpu->arch.apic;
837
838 if (!apic) {
839 value |= MSR_IA32_APICBASE_BSP;
840 vcpu->arch.apic_base = value;
841 return;
842 }
843 if (apic->vcpu->vcpu_id)
844 value &= ~MSR_IA32_APICBASE_BSP;
845
846 vcpu->arch.apic_base = value;
847 apic->base_address = apic->vcpu->arch.apic_base &
848 MSR_IA32_APICBASE_BASE;
849
850 /* with FSB delivery interrupt, we can restart APIC functionality */
851 apic_debug("apic base msr is 0x%016" PRIx64 ", and base address is "
852 "0x%lx.\n", apic->vcpu->arch.apic_base, apic->base_address);
853
854 }
855
856 u64 kvm_lapic_get_base(struct kvm_vcpu *vcpu)
857 {
858 return vcpu->arch.apic_base;
859 }
860 EXPORT_SYMBOL_GPL(kvm_lapic_get_base);
861
862 void kvm_lapic_reset(struct kvm_vcpu *vcpu)
863 {
864 struct kvm_lapic *apic;
865 int i;
866
867 apic_debug("%s\n", __FUNCTION__);
868
869 ASSERT(vcpu);
870 apic = vcpu->arch.apic;
871 ASSERT(apic != NULL);
872
873 /* Stop the timer in case it's a reset to an active apic */
874 hrtimer_cancel(&apic->timer.dev);
875
876 apic_set_reg(apic, APIC_ID, vcpu->vcpu_id << 24);
877 apic_set_reg(apic, APIC_LVR, APIC_VERSION);
878
879 for (i = 0; i < APIC_LVT_NUM; i++)
880 apic_set_reg(apic, APIC_LVTT + 0x10 * i, APIC_LVT_MASKED);
881 apic_set_reg(apic, APIC_LVT0,
882 SET_APIC_DELIVERY_MODE(0, APIC_MODE_EXTINT));
883
884 apic_set_reg(apic, APIC_DFR, 0xffffffffU);
885 apic_set_reg(apic, APIC_SPIV, 0xff);
886 apic_set_reg(apic, APIC_TASKPRI, 0);
887 apic_set_reg(apic, APIC_LDR, 0);
888 apic_set_reg(apic, APIC_ESR, 0);
889 apic_set_reg(apic, APIC_ICR, 0);
890 apic_set_reg(apic, APIC_ICR2, 0);
891 apic_set_reg(apic, APIC_TDCR, 0);
892 apic_set_reg(apic, APIC_TMICT, 0);
893 for (i = 0; i < 8; i++) {
894 apic_set_reg(apic, APIC_IRR + 0x10 * i, 0);
895 apic_set_reg(apic, APIC_ISR + 0x10 * i, 0);
896 apic_set_reg(apic, APIC_TMR + 0x10 * i, 0);
897 }
898 update_divide_count(apic);
899 atomic_set(&apic->timer.pending, 0);
900 if (vcpu->vcpu_id == 0)
901 vcpu->arch.apic_base |= MSR_IA32_APICBASE_BSP;
902 apic_update_ppr(apic);
903
904 apic_debug(KERN_INFO "%s: vcpu=%p, id=%d, base_msr="
905 "0x%016" PRIx64 ", base_address=0x%0lx.\n", __FUNCTION__,
906 vcpu, kvm_apic_id(apic),
907 vcpu->arch.apic_base, apic->base_address);
908 }
909 EXPORT_SYMBOL_GPL(kvm_lapic_reset);
910
911 int kvm_lapic_enabled(struct kvm_vcpu *vcpu)
912 {
913 struct kvm_lapic *apic = vcpu->arch.apic;
914 int ret = 0;
915
916 if (!apic)
917 return 0;
918 ret = apic_enabled(apic);
919
920 return ret;
921 }
922 EXPORT_SYMBOL_GPL(kvm_lapic_enabled);
923
924 /*
925 *----------------------------------------------------------------------
926 * timer interface
927 *----------------------------------------------------------------------
928 */
929
930 /* TODO: make sure __apic_timer_fn runs in current pCPU */
931 static int __apic_timer_fn(struct kvm_lapic *apic)
932 {
933 int result = 0;
934 wait_queue_head_t *q = &apic->vcpu->wq;
935
936 atomic_inc(&apic->timer.pending);
937 if (waitqueue_active(q)) {
938 apic->vcpu->arch.mp_state = VCPU_MP_STATE_RUNNABLE;
939 wake_up_interruptible(q);
940 }
941 if (apic_lvtt_period(apic)) {
942 result = 1;
943 apic->timer.dev.expires = ktime_add_ns(
944 apic->timer.dev.expires,
945 apic->timer.period);
946 }
947 return result;
948 }
949
950 static int __inject_apic_timer_irq(struct kvm_lapic *apic)
951 {
952 int vector;
953
954 vector = apic_lvt_vector(apic, APIC_LVTT);
955 return __apic_accept_irq(apic, APIC_DM_FIXED, vector, 1, 0);
956 }
957
958 static enum hrtimer_restart apic_timer_fn(struct hrtimer *data)
959 {
960 struct kvm_lapic *apic;
961 int restart_timer = 0;
962
963 apic = container_of(data, struct kvm_lapic, timer.dev);
964
965 restart_timer = __apic_timer_fn(apic);
966
967 if (restart_timer)
968 return HRTIMER_RESTART;
969 else
970 return HRTIMER_NORESTART;
971 }
972
973 int kvm_create_lapic(struct kvm_vcpu *vcpu)
974 {
975 struct kvm_lapic *apic;
976
977 ASSERT(vcpu != NULL);
978 apic_debug("apic_init %d\n", vcpu->vcpu_id);
979
980 apic = kzalloc(sizeof(*apic), GFP_KERNEL);
981 if (!apic)
982 goto nomem;
983
984 vcpu->arch.apic = apic;
985
986 apic->regs_page = alloc_page(GFP_KERNEL);
987 if (apic->regs_page == NULL) {
988 printk(KERN_ERR "malloc apic regs error for vcpu %x\n",
989 vcpu->vcpu_id);
990 goto nomem_free_apic;
991 }
992 apic->regs = page_address(apic->regs_page);
993 memset(apic->regs, 0, PAGE_SIZE);
994 apic->vcpu = vcpu;
995
996 hrtimer_init(&apic->timer.dev, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
997 apic->timer.dev.function = apic_timer_fn;
998 apic->base_address = APIC_DEFAULT_PHYS_BASE;
999 vcpu->arch.apic_base = APIC_DEFAULT_PHYS_BASE;
1000
1001 kvm_lapic_reset(vcpu);
1002 apic->dev.read = apic_mmio_read;
1003 apic->dev.write = apic_mmio_write;
1004 apic->dev.in_range = apic_mmio_range;
1005 apic->dev.private = apic;
1006
1007 return 0;
1008 nomem_free_apic:
1009 kfree(apic);
1010 nomem:
1011 return -ENOMEM;
1012 }
1013 EXPORT_SYMBOL_GPL(kvm_create_lapic);
1014
1015 int kvm_apic_has_interrupt(struct kvm_vcpu *vcpu)
1016 {
1017 struct kvm_lapic *apic = vcpu->arch.apic;
1018 int highest_irr;
1019
1020 if (!apic || !apic_enabled(apic))
1021 return -1;
1022
1023 apic_update_ppr(apic);
1024 highest_irr = apic_find_highest_irr(apic);
1025 if ((highest_irr == -1) ||
1026 ((highest_irr & 0xF0) <= apic_get_reg(apic, APIC_PROCPRI)))
1027 return -1;
1028 return highest_irr;
1029 }
1030
1031 int kvm_apic_accept_pic_intr(struct kvm_vcpu *vcpu)
1032 {
1033 u32 lvt0 = apic_get_reg(vcpu->arch.apic, APIC_LVT0);
1034 int r = 0;
1035
1036 if (vcpu->vcpu_id == 0) {
1037 if (!apic_hw_enabled(vcpu->arch.apic))
1038 r = 1;
1039 if ((lvt0 & APIC_LVT_MASKED) == 0 &&
1040 GET_APIC_DELIVERY_MODE(lvt0) == APIC_MODE_EXTINT)
1041 r = 1;
1042 }
1043 return r;
1044 }
1045
1046 void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu)
1047 {
1048 struct kvm_lapic *apic = vcpu->arch.apic;
1049
1050 if (apic && apic_lvt_enabled(apic, APIC_LVTT) &&
1051 atomic_read(&apic->timer.pending) > 0) {
1052 if (__inject_apic_timer_irq(apic))
1053 atomic_dec(&apic->timer.pending);
1054 }
1055 }
1056
1057 void kvm_apic_timer_intr_post(struct kvm_vcpu *vcpu, int vec)
1058 {
1059 struct kvm_lapic *apic = vcpu->arch.apic;
1060
1061 if (apic && apic_lvt_vector(apic, APIC_LVTT) == vec)
1062 apic->timer.last_update = ktime_add_ns(
1063 apic->timer.last_update,
1064 apic->timer.period);
1065 }
1066
1067 int kvm_get_apic_interrupt(struct kvm_vcpu *vcpu)
1068 {
1069 int vector = kvm_apic_has_interrupt(vcpu);
1070 struct kvm_lapic *apic = vcpu->arch.apic;
1071
1072 if (vector == -1)
1073 return -1;
1074
1075 apic_set_vector(vector, apic->regs + APIC_ISR);
1076 apic_update_ppr(apic);
1077 apic_clear_irr(vector, apic);
1078 return vector;
1079 }
1080
1081 void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu)
1082 {
1083 struct kvm_lapic *apic = vcpu->arch.apic;
1084
1085 apic->base_address = vcpu->arch.apic_base &
1086 MSR_IA32_APICBASE_BASE;
1087 apic_set_reg(apic, APIC_LVR, APIC_VERSION);
1088 apic_update_ppr(apic);
1089 hrtimer_cancel(&apic->timer.dev);
1090 update_divide_count(apic);
1091 start_apic_timer(apic);
1092 }
1093
1094 void kvm_migrate_apic_timer(struct kvm_vcpu *vcpu)
1095 {
1096 struct kvm_lapic *apic = vcpu->arch.apic;
1097 struct hrtimer *timer;
1098
1099 if (!apic)
1100 return;
1101
1102 timer = &apic->timer.dev;
1103 if (hrtimer_cancel(timer))
1104 hrtimer_start(timer, timer->expires, HRTIMER_MODE_ABS);
1105 }
1106 EXPORT_SYMBOL_GPL(kvm_migrate_apic_timer);
Linux kernel - Deliverables
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