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21#include <linux/kvm_host.h>
22#include <linux/kvm.h>
23#include <linux/mm.h>
24#include <linux/highmem.h>
25#include <linux/smp.h>
26#include <linux/hrtimer.h>
27#include <linux/io.h>
28#include <linux/module.h>
29#include <linux/math64.h>
30#include <linux/slab.h>
31#include <asm/processor.h>
32#include <asm/msr.h>
33#include <asm/page.h>
34#include <asm/current.h>
35#include <asm/apicdef.h>
36#include <linux/atomic.h>
37#include "kvm_cache_regs.h"
38#include "irq.h"
39#include "trace.h"
40#include "x86.h"
41
42#ifndef CONFIG_X86_64
43#define mod_64(x, y) ((x) - (y) * div64_u64(x, y))
44#else
45#define mod_64(x, y) ((x) % (y))
46#endif
47
48#define PRId64 "d"
49#define PRIx64 "llx"
50#define PRIu64 "u"
51#define PRIo64 "o"
52
53#define APIC_BUS_CYCLE_NS 1
54
55
56#define apic_debug(fmt, arg...)
57
58#define APIC_LVT_NUM 6
59
60#define APIC_VERSION (0x14UL | ((APIC_LVT_NUM - 1) << 16))
61#define LAPIC_MMIO_LENGTH (1 << 12)
62
63#define APIC_SHORT_MASK 0xc0000
64#define APIC_DEST_NOSHORT 0x0
65#define APIC_DEST_MASK 0x800
66#define MAX_APIC_VECTOR 256
67
68#define VEC_POS(v) ((v) & (32 - 1))
69#define REG_POS(v) (((v) >> 5) << 4)
70
71static unsigned int min_timer_period_us = 500;
72module_param(min_timer_period_us, uint, S_IRUGO | S_IWUSR);
73
74static inline u32 apic_get_reg(struct kvm_lapic *apic, int reg_off)
75{
76 return *((u32 *) (apic->regs + reg_off));
77}
78
79static inline void apic_set_reg(struct kvm_lapic *apic, int reg_off, u32 val)
80{
81 *((u32 *) (apic->regs + reg_off)) = val;
82}
83
84static inline int apic_test_and_set_vector(int vec, void *bitmap)
85{
86 return test_and_set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
87}
88
89static inline int apic_test_and_clear_vector(int vec, void *bitmap)
90{
91 return test_and_clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
92}
93
94static inline void apic_set_vector(int vec, void *bitmap)
95{
96 set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
97}
98
99static inline void apic_clear_vector(int vec, void *bitmap)
100{
101 clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
102}
103
104static inline int apic_hw_enabled(struct kvm_lapic *apic)
105{
106 return (apic)->vcpu->arch.apic_base & MSR_IA32_APICBASE_ENABLE;
107}
108
109static inline int apic_sw_enabled(struct kvm_lapic *apic)
110{
111 return apic_get_reg(apic, APIC_SPIV) & APIC_SPIV_APIC_ENABLED;
112}
113
114static inline int apic_enabled(struct kvm_lapic *apic)
115{
116 return apic_sw_enabled(apic) && apic_hw_enabled(apic);
117}
118
119#define LVT_MASK \
120 (APIC_LVT_MASKED | APIC_SEND_PENDING | APIC_VECTOR_MASK)
121
122#define LINT_MASK \
123 (LVT_MASK | APIC_MODE_MASK | APIC_INPUT_POLARITY | \
124 APIC_LVT_REMOTE_IRR | APIC_LVT_LEVEL_TRIGGER)
125
126static inline int kvm_apic_id(struct kvm_lapic *apic)
127{
128 return (apic_get_reg(apic, APIC_ID) >> 24) & 0xff;
129}
130
131static inline int apic_lvt_enabled(struct kvm_lapic *apic, int lvt_type)
132{
133 return !(apic_get_reg(apic, lvt_type) & APIC_LVT_MASKED);
134}
135
136static inline int apic_lvt_vector(struct kvm_lapic *apic, int lvt_type)
137{
138 return apic_get_reg(apic, lvt_type) & APIC_VECTOR_MASK;
139}
140
141static inline int apic_lvtt_oneshot(struct kvm_lapic *apic)
142{
143 return ((apic_get_reg(apic, APIC_LVTT) &
144 apic->lapic_timer.timer_mode_mask) == APIC_LVT_TIMER_ONESHOT);
145}
146
147static inline int apic_lvtt_period(struct kvm_lapic *apic)
148{
149 return ((apic_get_reg(apic, APIC_LVTT) &
150 apic->lapic_timer.timer_mode_mask) == APIC_LVT_TIMER_PERIODIC);
151}
152
153static inline int apic_lvtt_tscdeadline(struct kvm_lapic *apic)
154{
155 return ((apic_get_reg(apic, APIC_LVTT) &
156 apic->lapic_timer.timer_mode_mask) ==
157 APIC_LVT_TIMER_TSCDEADLINE);
158}
159
160static inline int apic_lvt_nmi_mode(u32 lvt_val)
161{
162 return (lvt_val & (APIC_MODE_MASK | APIC_LVT_MASKED)) == APIC_DM_NMI;
163}
164
165void kvm_apic_set_version(struct kvm_vcpu *vcpu)
166{
167 struct kvm_lapic *apic = vcpu->arch.apic;
168 struct kvm_cpuid_entry2 *feat;
169 u32 v = APIC_VERSION;
170
171 if (!irqchip_in_kernel(vcpu->kvm))
172 return;
173
174 feat = kvm_find_cpuid_entry(apic->vcpu, 0x1, 0);
175 if (feat && (feat->ecx & (1 << (X86_FEATURE_X2APIC & 31))))
176 v |= APIC_LVR_DIRECTED_EOI;
177 apic_set_reg(apic, APIC_LVR, v);
178}
179
180static inline int apic_x2apic_mode(struct kvm_lapic *apic)
181{
182 return apic->vcpu->arch.apic_base & X2APIC_ENABLE;
183}
184
185static unsigned int apic_lvt_mask[APIC_LVT_NUM] = {
186 LVT_MASK ,
187 LVT_MASK | APIC_MODE_MASK,
188 LVT_MASK | APIC_MODE_MASK,
189 LINT_MASK, LINT_MASK,
190 LVT_MASK
191};
192
193static int find_highest_vector(void *bitmap)
194{
195 u32 *word = bitmap;
196 int word_offset = MAX_APIC_VECTOR >> 5;
197
198 while ((word_offset != 0) && (word[(--word_offset) << 2] == 0))
199 continue;
200
201 if (likely(!word_offset && !word[0]))
202 return -1;
203 else
204 return fls(word[word_offset << 2]) - 1 + (word_offset << 5);
205}
206
207static inline int apic_test_and_set_irr(int vec, struct kvm_lapic *apic)
208{
209 apic->irr_pending = true;
210 return apic_test_and_set_vector(vec, apic->regs + APIC_IRR);
211}
212
213static inline int apic_search_irr(struct kvm_lapic *apic)
214{
215 return find_highest_vector(apic->regs + APIC_IRR);
216}
217
218static inline int apic_find_highest_irr(struct kvm_lapic *apic)
219{
220 int result;
221
222 if (!apic->irr_pending)
223 return -1;
224
225 result = apic_search_irr(apic);
226 ASSERT(result == -1 || result >= 16);
227
228 return result;
229}
230
231static inline void apic_clear_irr(int vec, struct kvm_lapic *apic)
232{
233 apic->irr_pending = false;
234 apic_clear_vector(vec, apic->regs + APIC_IRR);
235 if (apic_search_irr(apic) != -1)
236 apic->irr_pending = true;
237}
238
239int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu)
240{
241 struct kvm_lapic *apic = vcpu->arch.apic;
242 int highest_irr;
243
244
245
246
247
248
249 if (!apic)
250 return 0;
251 highest_irr = apic_find_highest_irr(apic);
252
253 return highest_irr;
254}
255
256static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
257 int vector, int level, int trig_mode);
258
259int kvm_apic_set_irq(struct kvm_vcpu *vcpu, struct kvm_lapic_irq *irq)
260{
261 struct kvm_lapic *apic = vcpu->arch.apic;
262
263 return __apic_accept_irq(apic, irq->delivery_mode, irq->vector,
264 irq->level, irq->trig_mode);
265}
266
267static inline int apic_find_highest_isr(struct kvm_lapic *apic)
268{
269 int result;
270
271 result = find_highest_vector(apic->regs + APIC_ISR);
272 ASSERT(result == -1 || result >= 16);
273
274 return result;
275}
276
277static void apic_update_ppr(struct kvm_lapic *apic)
278{
279 u32 tpr, isrv, ppr, old_ppr;
280 int isr;
281
282 old_ppr = apic_get_reg(apic, APIC_PROCPRI);
283 tpr = apic_get_reg(apic, APIC_TASKPRI);
284 isr = apic_find_highest_isr(apic);
285 isrv = (isr != -1) ? isr : 0;
286
287 if ((tpr & 0xf0) >= (isrv & 0xf0))
288 ppr = tpr & 0xff;
289 else
290 ppr = isrv & 0xf0;
291
292 apic_debug("vlapic %p, ppr 0x%x, isr 0x%x, isrv 0x%x",
293 apic, ppr, isr, isrv);
294
295 if (old_ppr != ppr) {
296 apic_set_reg(apic, APIC_PROCPRI, ppr);
297 if (ppr < old_ppr)
298 kvm_make_request(KVM_REQ_EVENT, apic->vcpu);
299 }
300}
301
302static void apic_set_tpr(struct kvm_lapic *apic, u32 tpr)
303{
304 apic_set_reg(apic, APIC_TASKPRI, tpr);
305 apic_update_ppr(apic);
306}
307
308int kvm_apic_match_physical_addr(struct kvm_lapic *apic, u16 dest)
309{
310 return dest == 0xff || kvm_apic_id(apic) == dest;
311}
312
313int kvm_apic_match_logical_addr(struct kvm_lapic *apic, u8 mda)
314{
315 int result = 0;
316 u32 logical_id;
317
318 if (apic_x2apic_mode(apic)) {
319 logical_id = apic_get_reg(apic, APIC_LDR);
320 return logical_id & mda;
321 }
322
323 logical_id = GET_APIC_LOGICAL_ID(apic_get_reg(apic, APIC_LDR));
324
325 switch (apic_get_reg(apic, APIC_DFR)) {
326 case APIC_DFR_FLAT:
327 if (logical_id & mda)
328 result = 1;
329 break;
330 case APIC_DFR_CLUSTER:
331 if (((logical_id >> 4) == (mda >> 0x4))
332 && (logical_id & mda & 0xf))
333 result = 1;
334 break;
335 default:
336 apic_debug("Bad DFR vcpu %d: %08x\n",
337 apic->vcpu->vcpu_id, apic_get_reg(apic, APIC_DFR));
338 break;
339 }
340
341 return result;
342}
343
344int kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
345 int short_hand, int dest, int dest_mode)
346{
347 int result = 0;
348 struct kvm_lapic *target = vcpu->arch.apic;
349
350 apic_debug("target %p, source %p, dest 0x%x, "
351 "dest_mode 0x%x, short_hand 0x%x\n",
352 target, source, dest, dest_mode, short_hand);
353
354 ASSERT(target);
355 switch (short_hand) {
356 case APIC_DEST_NOSHORT:
357 if (dest_mode == 0)
358
359 result = kvm_apic_match_physical_addr(target, dest);
360 else
361
362 result = kvm_apic_match_logical_addr(target, dest);
363 break;
364 case APIC_DEST_SELF:
365 result = (target == source);
366 break;
367 case APIC_DEST_ALLINC:
368 result = 1;
369 break;
370 case APIC_DEST_ALLBUT:
371 result = (target != source);
372 break;
373 default:
374 apic_debug("kvm: apic: Bad dest shorthand value %x\n",
375 short_hand);
376 break;
377 }
378
379 return result;
380}
381
382
383
384
385
386static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
387 int vector, int level, int trig_mode)
388{
389 int result = 0;
390 struct kvm_vcpu *vcpu = apic->vcpu;
391
392 switch (delivery_mode) {
393 case APIC_DM_LOWEST:
394 vcpu->arch.apic_arb_prio++;
395 case APIC_DM_FIXED:
396
397 if (unlikely(!apic_enabled(apic)))
398 break;
399
400 if (trig_mode) {
401 apic_debug("level trig mode for vector %d", vector);
402 apic_set_vector(vector, apic->regs + APIC_TMR);
403 } else
404 apic_clear_vector(vector, apic->regs + APIC_TMR);
405
406 result = !apic_test_and_set_irr(vector, apic);
407 trace_kvm_apic_accept_irq(vcpu->vcpu_id, delivery_mode,
408 trig_mode, vector, !result);
409 if (!result) {
410 if (trig_mode)
411 apic_debug("level trig mode repeatedly for "
412 "vector %d", vector);
413 break;
414 }
415
416 kvm_make_request(KVM_REQ_EVENT, vcpu);
417 kvm_vcpu_kick(vcpu);
418 break;
419
420 case APIC_DM_REMRD:
421 apic_debug("Ignoring delivery mode 3\n");
422 break;
423
424 case APIC_DM_SMI:
425 apic_debug("Ignoring guest SMI\n");
426 break;
427
428 case APIC_DM_NMI:
429 result = 1;
430 kvm_inject_nmi(vcpu);
431 kvm_vcpu_kick(vcpu);
432 break;
433
434 case APIC_DM_INIT:
435 if (level) {
436 result = 1;
437 vcpu->arch.mp_state = KVM_MP_STATE_INIT_RECEIVED;
438 kvm_make_request(KVM_REQ_EVENT, vcpu);
439 kvm_vcpu_kick(vcpu);
440 } else {
441 apic_debug("Ignoring de-assert INIT to vcpu %d\n",
442 vcpu->vcpu_id);
443 }
444 break;
445
446 case APIC_DM_STARTUP:
447 apic_debug("SIPI to vcpu %d vector 0x%02x\n",
448 vcpu->vcpu_id, vector);
449 if (vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) {
450 result = 1;
451 vcpu->arch.sipi_vector = vector;
452 vcpu->arch.mp_state = KVM_MP_STATE_SIPI_RECEIVED;
453 kvm_make_request(KVM_REQ_EVENT, vcpu);
454 kvm_vcpu_kick(vcpu);
455 }
456 break;
457
458 case APIC_DM_EXTINT:
459
460
461
462
463
464 break;
465
466 default:
467 printk(KERN_ERR "TODO: unsupported delivery mode %x\n",
468 delivery_mode);
469 break;
470 }
471 return result;
472}
473
474int kvm_apic_compare_prio(struct kvm_vcpu *vcpu1, struct kvm_vcpu *vcpu2)
475{
476 return vcpu1->arch.apic_arb_prio - vcpu2->arch.apic_arb_prio;
477}
478
479static void apic_set_eoi(struct kvm_lapic *apic)
480{
481 int vector = apic_find_highest_isr(apic);
482 int trigger_mode;
483
484
485
486
487 if (vector == -1)
488 return;
489
490 apic_clear_vector(vector, apic->regs + APIC_ISR);
491 apic_update_ppr(apic);
492
493 if (apic_test_and_clear_vector(vector, apic->regs + APIC_TMR))
494 trigger_mode = IOAPIC_LEVEL_TRIG;
495 else
496 trigger_mode = IOAPIC_EDGE_TRIG;
497 if (!(apic_get_reg(apic, APIC_SPIV) & APIC_SPIV_DIRECTED_EOI))
498 kvm_ioapic_update_eoi(apic->vcpu->kvm, vector, trigger_mode);
499 kvm_make_request(KVM_REQ_EVENT, apic->vcpu);
500}
501
502static void apic_send_ipi(struct kvm_lapic *apic)
503{
504 u32 icr_low = apic_get_reg(apic, APIC_ICR);
505 u32 icr_high = apic_get_reg(apic, APIC_ICR2);
506 struct kvm_lapic_irq irq;
507
508 irq.vector = icr_low & APIC_VECTOR_MASK;
509 irq.delivery_mode = icr_low & APIC_MODE_MASK;
510 irq.dest_mode = icr_low & APIC_DEST_MASK;
511 irq.level = icr_low & APIC_INT_ASSERT;
512 irq.trig_mode = icr_low & APIC_INT_LEVELTRIG;
513 irq.shorthand = icr_low & APIC_SHORT_MASK;
514 if (apic_x2apic_mode(apic))
515 irq.dest_id = icr_high;
516 else
517 irq.dest_id = GET_APIC_DEST_FIELD(icr_high);
518
519 trace_kvm_apic_ipi(icr_low, irq.dest_id);
520
521 apic_debug("icr_high 0x%x, icr_low 0x%x, "
522 "short_hand 0x%x, dest 0x%x, trig_mode 0x%x, level 0x%x, "
523 "dest_mode 0x%x, delivery_mode 0x%x, vector 0x%x\n",
524 icr_high, icr_low, irq.shorthand, irq.dest_id,
525 irq.trig_mode, irq.level, irq.dest_mode, irq.delivery_mode,
526 irq.vector);
527
528 kvm_irq_delivery_to_apic(apic->vcpu->kvm, apic, &irq);
529}
530
531static u32 apic_get_tmcct(struct kvm_lapic *apic)
532{
533 ktime_t remaining;
534 s64 ns;
535 u32 tmcct;
536
537 ASSERT(apic != NULL);
538
539
540 if (apic_get_reg(apic, APIC_TMICT) == 0)
541 return 0;
542
543 remaining = hrtimer_get_remaining(&apic->lapic_timer.timer);
544 if (ktime_to_ns(remaining) < 0)
545 remaining = ktime_set(0, 0);
546
547 ns = mod_64(ktime_to_ns(remaining), apic->lapic_timer.period);
548 tmcct = div64_u64(ns,
549 (APIC_BUS_CYCLE_NS * apic->divide_count));
550
551 return tmcct;
552}
553
554static 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 kvm_make_request(KVM_REQ_REPORT_TPR_ACCESS, vcpu);
560 run->tpr_access.rip = kvm_rip_read(vcpu);
561 run->tpr_access.is_write = write;
562}
563
564static inline void report_tpr_access(struct kvm_lapic *apic, bool write)
565{
566 if (apic->vcpu->arch.tpr_access_reporting)
567 __report_tpr_access(apic, write);
568}
569
570static u32 __apic_read(struct kvm_lapic *apic, unsigned int offset)
571{
572 u32 val = 0;
573
574 if (offset >= LAPIC_MMIO_LENGTH)
575 return 0;
576
577 switch (offset) {
578 case APIC_ID:
579 if (apic_x2apic_mode(apic))
580 val = kvm_apic_id(apic);
581 else
582 val = kvm_apic_id(apic) << 24;
583 break;
584 case APIC_ARBPRI:
585 apic_debug("Access APIC ARBPRI register which is for P6\n");
586 break;
587
588 case APIC_TMCCT:
589 if (apic_lvtt_tscdeadline(apic))
590 return 0;
591
592 val = apic_get_tmcct(apic);
593 break;
594
595 case APIC_TASKPRI:
596 report_tpr_access(apic, false);
597
598 default:
599 apic_update_ppr(apic);
600 val = apic_get_reg(apic, offset);
601 break;
602 }
603
604 return val;
605}
606
607static inline struct kvm_lapic *to_lapic(struct kvm_io_device *dev)
608{
609 return container_of(dev, struct kvm_lapic, dev);
610}
611
612static int apic_reg_read(struct kvm_lapic *apic, u32 offset, int len,
613 void *data)
614{
615 unsigned char alignment = offset & 0xf;
616 u32 result;
617
618 static const u64 rmask = 0x43ff01ffffffe70cULL;
619
620 if ((alignment + len) > 4) {
621 apic_debug("KVM_APIC_READ: alignment error %x %d\n",
622 offset, len);
623 return 1;
624 }
625
626 if (offset > 0x3f0 || !(rmask & (1ULL << (offset >> 4)))) {
627 apic_debug("KVM_APIC_READ: read reserved register %x\n",
628 offset);
629 return 1;
630 }
631
632 result = __apic_read(apic, offset & ~0xf);
633
634 trace_kvm_apic_read(offset, result);
635
636 switch (len) {
637 case 1:
638 case 2:
639 case 4:
640 memcpy(data, (char *)&result + alignment, len);
641 break;
642 default:
643 printk(KERN_ERR "Local APIC read with len = %x, "
644 "should be 1,2, or 4 instead\n", len);
645 break;
646 }
647 return 0;
648}
649
650static int apic_mmio_in_range(struct kvm_lapic *apic, gpa_t addr)
651{
652 return apic_hw_enabled(apic) &&
653 addr >= apic->base_address &&
654 addr < apic->base_address + LAPIC_MMIO_LENGTH;
655}
656
657static int apic_mmio_read(struct kvm_io_device *this,
658 gpa_t address, int len, void *data)
659{
660 struct kvm_lapic *apic = to_lapic(this);
661 u32 offset = address - apic->base_address;
662
663 if (!apic_mmio_in_range(apic, address))
664 return -EOPNOTSUPP;
665
666 apic_reg_read(apic, offset, len, data);
667
668 return 0;
669}
670
671static void update_divide_count(struct kvm_lapic *apic)
672{
673 u32 tmp1, tmp2, tdcr;
674
675 tdcr = apic_get_reg(apic, APIC_TDCR);
676 tmp1 = tdcr & 0xf;
677 tmp2 = ((tmp1 & 0x3) | ((tmp1 & 0x8) >> 1)) + 1;
678 apic->divide_count = 0x1 << (tmp2 & 0x7);
679
680 apic_debug("timer divide count is 0x%x\n",
681 apic->divide_count);
682}
683
684static void start_apic_timer(struct kvm_lapic *apic)
685{
686 ktime_t now;
687 atomic_set(&apic->lapic_timer.pending, 0);
688
689 if (apic_lvtt_period(apic) || apic_lvtt_oneshot(apic)) {
690
691 now = apic->lapic_timer.timer.base->get_time();
692 apic->lapic_timer.period = (u64)apic_get_reg(apic, APIC_TMICT)
693 * APIC_BUS_CYCLE_NS * apic->divide_count;
694
695 if (!apic->lapic_timer.period)
696 return;
697
698
699
700
701
702 if (apic_lvtt_period(apic)) {
703 s64 min_period = min_timer_period_us * 1000LL;
704
705 if (apic->lapic_timer.period < min_period) {
706 pr_info_ratelimited(
707 "kvm: vcpu %i: requested %lld ns "
708 "lapic timer period limited to %lld ns\n",
709 apic->vcpu->vcpu_id,
710 apic->lapic_timer.period, min_period);
711 apic->lapic_timer.period = min_period;
712 }
713 }
714
715 hrtimer_start(&apic->lapic_timer.timer,
716 ktime_add_ns(now, apic->lapic_timer.period),
717 HRTIMER_MODE_ABS);
718
719 apic_debug("%s: bus cycle is %" PRId64 "ns, now 0x%016"
720 PRIx64 ", "
721 "timer initial count 0x%x, period %lldns, "
722 "expire @ 0x%016" PRIx64 ".\n", __func__,
723 APIC_BUS_CYCLE_NS, ktime_to_ns(now),
724 apic_get_reg(apic, APIC_TMICT),
725 apic->lapic_timer.period,
726 ktime_to_ns(ktime_add_ns(now,
727 apic->lapic_timer.period)));
728 } else if (apic_lvtt_tscdeadline(apic)) {
729
730 u64 guest_tsc, tscdeadline = apic->lapic_timer.tscdeadline;
731 u64 ns = 0;
732 struct kvm_vcpu *vcpu = apic->vcpu;
733 unsigned long this_tsc_khz = vcpu_tsc_khz(vcpu);
734 unsigned long flags;
735
736 if (unlikely(!tscdeadline || !this_tsc_khz))
737 return;
738
739 local_irq_save(flags);
740
741 now = apic->lapic_timer.timer.base->get_time();
742 guest_tsc = kvm_x86_ops->read_l1_tsc(vcpu);
743 if (likely(tscdeadline > guest_tsc)) {
744 ns = (tscdeadline - guest_tsc) * 1000000ULL;
745 do_div(ns, this_tsc_khz);
746 }
747 hrtimer_start(&apic->lapic_timer.timer,
748 ktime_add_ns(now, ns), HRTIMER_MODE_ABS);
749
750 local_irq_restore(flags);
751 }
752}
753
754static void apic_manage_nmi_watchdog(struct kvm_lapic *apic, u32 lvt0_val)
755{
756 int nmi_wd_enabled = apic_lvt_nmi_mode(apic_get_reg(apic, APIC_LVT0));
757
758 if (apic_lvt_nmi_mode(lvt0_val)) {
759 if (!nmi_wd_enabled) {
760 apic_debug("Receive NMI setting on APIC_LVT0 "
761 "for cpu %d\n", apic->vcpu->vcpu_id);
762 apic->vcpu->kvm->arch.vapics_in_nmi_mode++;
763 }
764 } else if (nmi_wd_enabled)
765 apic->vcpu->kvm->arch.vapics_in_nmi_mode--;
766}
767
768static int apic_reg_write(struct kvm_lapic *apic, u32 reg, u32 val)
769{
770 int ret = 0;
771
772 trace_kvm_apic_write(reg, val);
773
774 switch (reg) {
775 case APIC_ID:
776 if (!apic_x2apic_mode(apic))
777 apic_set_reg(apic, APIC_ID, val);
778 else
779 ret = 1;
780 break;
781
782 case APIC_TASKPRI:
783 report_tpr_access(apic, true);
784 apic_set_tpr(apic, val & 0xff);
785 break;
786
787 case APIC_EOI:
788 apic_set_eoi(apic);
789 break;
790
791 case APIC_LDR:
792 if (!apic_x2apic_mode(apic))
793 apic_set_reg(apic, APIC_LDR, val & APIC_LDR_MASK);
794 else
795 ret = 1;
796 break;
797
798 case APIC_DFR:
799 if (!apic_x2apic_mode(apic))
800 apic_set_reg(apic, APIC_DFR, val | 0x0FFFFFFF);
801 else
802 ret = 1;
803 break;
804
805 case APIC_SPIV: {
806 u32 mask = 0x3ff;
807 if (apic_get_reg(apic, APIC_LVR) & APIC_LVR_DIRECTED_EOI)
808 mask |= APIC_SPIV_DIRECTED_EOI;
809 apic_set_reg(apic, APIC_SPIV, val & mask);
810 if (!(val & APIC_SPIV_APIC_ENABLED)) {
811 int i;
812 u32 lvt_val;
813
814 for (i = 0; i < APIC_LVT_NUM; i++) {
815 lvt_val = apic_get_reg(apic,
816 APIC_LVTT + 0x10 * i);
817 apic_set_reg(apic, APIC_LVTT + 0x10 * i,
818 lvt_val | APIC_LVT_MASKED);
819 }
820 atomic_set(&apic->lapic_timer.pending, 0);
821
822 }
823 break;
824 }
825 case APIC_ICR:
826
827 apic_set_reg(apic, APIC_ICR, val & ~(1 << 12));
828 apic_send_ipi(apic);
829 break;
830
831 case APIC_ICR2:
832 if (!apic_x2apic_mode(apic))
833 val &= 0xff000000;
834 apic_set_reg(apic, APIC_ICR2, val);
835 break;
836
837 case APIC_LVT0:
838 apic_manage_nmi_watchdog(apic, val);
839 case APIC_LVTTHMR:
840 case APIC_LVTPC:
841 case APIC_LVT1:
842 case APIC_LVTERR:
843
844 if (!apic_sw_enabled(apic))
845 val |= APIC_LVT_MASKED;
846
847 val &= apic_lvt_mask[(reg - APIC_LVTT) >> 4];
848 apic_set_reg(apic, reg, val);
849
850 break;
851
852 case APIC_LVTT:
853 if ((apic_get_reg(apic, APIC_LVTT) &
854 apic->lapic_timer.timer_mode_mask) !=
855 (val & apic->lapic_timer.timer_mode_mask))
856 hrtimer_cancel(&apic->lapic_timer.timer);
857
858 if (!apic_sw_enabled(apic))
859 val |= APIC_LVT_MASKED;
860 val &= (apic_lvt_mask[0] | apic->lapic_timer.timer_mode_mask);
861 apic_set_reg(apic, APIC_LVTT, val);
862 break;
863
864 case APIC_TMICT:
865 if (apic_lvtt_tscdeadline(apic))
866 break;
867
868 hrtimer_cancel(&apic->lapic_timer.timer);
869 apic_set_reg(apic, APIC_TMICT, val);
870 start_apic_timer(apic);
871 break;
872
873 case APIC_TDCR:
874 if (val & 4)
875 apic_debug("KVM_WRITE:TDCR %x\n", val);
876 apic_set_reg(apic, APIC_TDCR, val);
877 update_divide_count(apic);
878 break;
879
880 case APIC_ESR:
881 if (apic_x2apic_mode(apic) && val != 0) {
882 apic_debug("KVM_WRITE:ESR not zero %x\n", val);
883 ret = 1;
884 }
885 break;
886
887 case APIC_SELF_IPI:
888 if (apic_x2apic_mode(apic)) {
889 apic_reg_write(apic, APIC_ICR, 0x40000 | (val & 0xff));
890 } else
891 ret = 1;
892 break;
893 default:
894 ret = 1;
895 break;
896 }
897 if (ret)
898 apic_debug("Local APIC Write to read-only register %x\n", reg);
899 return ret;
900}
901
902static int apic_mmio_write(struct kvm_io_device *this,
903 gpa_t address, int len, const void *data)
904{
905 struct kvm_lapic *apic = to_lapic(this);
906 unsigned int offset = address - apic->base_address;
907 u32 val;
908
909 if (!apic_mmio_in_range(apic, address))
910 return -EOPNOTSUPP;
911
912
913
914
915
916
917 if (len != 4 || (offset & 0xf)) {
918
919 apic_debug("apic write: bad size=%d %lx\n", len, (long)address);
920 return 0;
921 }
922
923 val = *(u32*)data;
924
925
926 if (offset != APIC_EOI)
927 apic_debug("%s: offset 0x%x with length 0x%x, and value is "
928 "0x%x\n", __func__, offset, len, val);
929
930 apic_reg_write(apic, offset & 0xff0, val);
931
932 return 0;
933}
934
935void kvm_lapic_set_eoi(struct kvm_vcpu *vcpu)
936{
937 struct kvm_lapic *apic = vcpu->arch.apic;
938
939 if (apic)
940 apic_reg_write(vcpu->arch.apic, APIC_EOI, 0);
941}
942EXPORT_SYMBOL_GPL(kvm_lapic_set_eoi);
943
944void kvm_free_lapic(struct kvm_vcpu *vcpu)
945{
946 if (!vcpu->arch.apic)
947 return;
948
949 hrtimer_cancel(&vcpu->arch.apic->lapic_timer.timer);
950
951 if (vcpu->arch.apic->regs)
952 free_page((unsigned long)vcpu->arch.apic->regs);
953
954 kfree(vcpu->arch.apic);
955}
956
957
958
959
960
961
962
963u64 kvm_get_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu)
964{
965 struct kvm_lapic *apic = vcpu->arch.apic;
966 if (!apic)
967 return 0;
968
969 if (apic_lvtt_oneshot(apic) || apic_lvtt_period(apic))
970 return 0;
971
972 return apic->lapic_timer.tscdeadline;
973}
974
975void kvm_set_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu, u64 data)
976{
977 struct kvm_lapic *apic = vcpu->arch.apic;
978 if (!apic)
979 return;
980
981 if (apic_lvtt_oneshot(apic) || apic_lvtt_period(apic))
982 return;
983
984 hrtimer_cancel(&apic->lapic_timer.timer);
985 apic->lapic_timer.tscdeadline = data;
986 start_apic_timer(apic);
987}
988
989void kvm_lapic_set_tpr(struct kvm_vcpu *vcpu, unsigned long cr8)
990{
991 struct kvm_lapic *apic = vcpu->arch.apic;
992
993 if (!apic)
994 return;
995 apic_set_tpr(apic, ((cr8 & 0x0f) << 4)
996 | (apic_get_reg(apic, APIC_TASKPRI) & 4));
997}
998
999u64 kvm_lapic_get_cr8(struct kvm_vcpu *vcpu)
1000{
1001 struct kvm_lapic *apic = vcpu->arch.apic;
1002 u64 tpr;
1003
1004 if (!apic)
1005 return 0;
1006 tpr = (u64) apic_get_reg(apic, APIC_TASKPRI);
1007
1008 return (tpr & 0xf0) >> 4;
1009}
1010
1011void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value)
1012{
1013 struct kvm_lapic *apic = vcpu->arch.apic;
1014
1015 if (!apic) {
1016 value |= MSR_IA32_APICBASE_BSP;
1017 vcpu->arch.apic_base = value;
1018 return;
1019 }
1020
1021 if (!kvm_vcpu_is_bsp(apic->vcpu))
1022 value &= ~MSR_IA32_APICBASE_BSP;
1023
1024 vcpu->arch.apic_base = value;
1025 if (apic_x2apic_mode(apic)) {
1026 u32 id = kvm_apic_id(apic);
1027 u32 ldr = ((id & ~0xf) << 16) | (1 << (id & 0xf));
1028 apic_set_reg(apic, APIC_LDR, ldr);
1029 }
1030 apic->base_address = apic->vcpu->arch.apic_base &
1031 MSR_IA32_APICBASE_BASE;
1032
1033
1034 apic_debug("apic base msr is 0x%016" PRIx64 ", and base address is "
1035 "0x%lx.\n", apic->vcpu->arch.apic_base, apic->base_address);
1036
1037}
1038
1039void kvm_lapic_reset(struct kvm_vcpu *vcpu)
1040{
1041 struct kvm_lapic *apic;
1042 int i;
1043
1044 apic_debug("%s\n", __func__);
1045
1046 ASSERT(vcpu);
1047 apic = vcpu->arch.apic;
1048 ASSERT(apic != NULL);
1049
1050
1051 hrtimer_cancel(&apic->lapic_timer.timer);
1052
1053 apic_set_reg(apic, APIC_ID, vcpu->vcpu_id << 24);
1054 kvm_apic_set_version(apic->vcpu);
1055
1056 for (i = 0; i < APIC_LVT_NUM; i++)
1057 apic_set_reg(apic, APIC_LVTT + 0x10 * i, APIC_LVT_MASKED);
1058 apic_set_reg(apic, APIC_LVT0,
1059 SET_APIC_DELIVERY_MODE(0, APIC_MODE_EXTINT));
1060
1061 apic_set_reg(apic, APIC_DFR, 0xffffffffU);
1062 apic_set_reg(apic, APIC_SPIV, 0xff);
1063 apic_set_reg(apic, APIC_TASKPRI, 0);
1064 apic_set_reg(apic, APIC_LDR, 0);
1065 apic_set_reg(apic, APIC_ESR, 0);
1066 apic_set_reg(apic, APIC_ICR, 0);
1067 apic_set_reg(apic, APIC_ICR2, 0);
1068 apic_set_reg(apic, APIC_TDCR, 0);
1069 apic_set_reg(apic, APIC_TMICT, 0);
1070 for (i = 0; i < 8; i++) {
1071 apic_set_reg(apic, APIC_IRR + 0x10 * i, 0);
1072 apic_set_reg(apic, APIC_ISR + 0x10 * i, 0);
1073 apic_set_reg(apic, APIC_TMR + 0x10 * i, 0);
1074 }
1075 apic->irr_pending = false;
1076 update_divide_count(apic);
1077 atomic_set(&apic->lapic_timer.pending, 0);
1078 if (kvm_vcpu_is_bsp(vcpu))
1079 vcpu->arch.apic_base |= MSR_IA32_APICBASE_BSP;
1080 apic_update_ppr(apic);
1081
1082 vcpu->arch.apic_arb_prio = 0;
1083
1084 apic_debug(KERN_INFO "%s: vcpu=%p, id=%d, base_msr="
1085 "0x%016" PRIx64 ", base_address=0x%0lx.\n", __func__,
1086 vcpu, kvm_apic_id(apic),
1087 vcpu->arch.apic_base, apic->base_address);
1088}
1089
1090bool kvm_apic_present(struct kvm_vcpu *vcpu)
1091{
1092 return vcpu->arch.apic && apic_hw_enabled(vcpu->arch.apic);
1093}
1094
1095int kvm_lapic_enabled(struct kvm_vcpu *vcpu)
1096{
1097 return kvm_apic_present(vcpu) && apic_sw_enabled(vcpu->arch.apic);
1098}
1099
1100
1101
1102
1103
1104
1105
1106static bool lapic_is_periodic(struct kvm_timer *ktimer)
1107{
1108 struct kvm_lapic *apic = container_of(ktimer, struct kvm_lapic,
1109 lapic_timer);
1110 return apic_lvtt_period(apic);
1111}
1112
1113int apic_has_pending_timer(struct kvm_vcpu *vcpu)
1114{
1115 struct kvm_lapic *lapic = vcpu->arch.apic;
1116
1117 if (lapic && apic_enabled(lapic) && apic_lvt_enabled(lapic, APIC_LVTT))
1118 return atomic_read(&lapic->lapic_timer.pending);
1119
1120 return 0;
1121}
1122
1123static int kvm_apic_local_deliver(struct kvm_lapic *apic, int lvt_type)
1124{
1125 u32 reg = apic_get_reg(apic, lvt_type);
1126 int vector, mode, trig_mode;
1127
1128 if (apic_hw_enabled(apic) && !(reg & APIC_LVT_MASKED)) {
1129 vector = reg & APIC_VECTOR_MASK;
1130 mode = reg & APIC_MODE_MASK;
1131 trig_mode = reg & APIC_LVT_LEVEL_TRIGGER;
1132 return __apic_accept_irq(apic, mode, vector, 1, trig_mode);
1133 }
1134 return 0;
1135}
1136
1137void kvm_apic_nmi_wd_deliver(struct kvm_vcpu *vcpu)
1138{
1139 struct kvm_lapic *apic = vcpu->arch.apic;
1140
1141 if (apic)
1142 kvm_apic_local_deliver(apic, APIC_LVT0);
1143}
1144
1145static struct kvm_timer_ops lapic_timer_ops = {
1146 .is_periodic = lapic_is_periodic,
1147};
1148
1149static const struct kvm_io_device_ops apic_mmio_ops = {
1150 .read = apic_mmio_read,
1151 .write = apic_mmio_write,
1152};
1153
1154int kvm_create_lapic(struct kvm_vcpu *vcpu)
1155{
1156 struct kvm_lapic *apic;
1157
1158 ASSERT(vcpu != NULL);
1159 apic_debug("apic_init %d\n", vcpu->vcpu_id);
1160
1161 apic = kzalloc(sizeof(*apic), GFP_KERNEL);
1162 if (!apic)
1163 goto nomem;
1164
1165 vcpu->arch.apic = apic;
1166
1167 apic->regs = (void *)get_zeroed_page(GFP_KERNEL);
1168 if (!apic->regs) {
1169 printk(KERN_ERR "malloc apic regs error for vcpu %x\n",
1170 vcpu->vcpu_id);
1171 goto nomem_free_apic;
1172 }
1173 apic->vcpu = vcpu;
1174
1175 hrtimer_init(&apic->lapic_timer.timer, CLOCK_MONOTONIC,
1176 HRTIMER_MODE_ABS);
1177 apic->lapic_timer.timer.function = kvm_timer_fn;
1178 apic->lapic_timer.t_ops = &lapic_timer_ops;
1179 apic->lapic_timer.kvm = vcpu->kvm;
1180 apic->lapic_timer.vcpu = vcpu;
1181
1182 apic->base_address = APIC_DEFAULT_PHYS_BASE;
1183 vcpu->arch.apic_base = APIC_DEFAULT_PHYS_BASE;
1184
1185 kvm_lapic_reset(vcpu);
1186 kvm_iodevice_init(&apic->dev, &apic_mmio_ops);
1187
1188 return 0;
1189nomem_free_apic:
1190 kfree(apic);
1191nomem:
1192 return -ENOMEM;
1193}
1194
1195int kvm_apic_has_interrupt(struct kvm_vcpu *vcpu)
1196{
1197 struct kvm_lapic *apic = vcpu->arch.apic;
1198 int highest_irr;
1199
1200 if (!apic || !apic_enabled(apic))
1201 return -1;
1202
1203 apic_update_ppr(apic);
1204 highest_irr = apic_find_highest_irr(apic);
1205 if ((highest_irr == -1) ||
1206 ((highest_irr & 0xF0) <= apic_get_reg(apic, APIC_PROCPRI)))
1207 return -1;
1208 return highest_irr;
1209}
1210
1211int kvm_apic_accept_pic_intr(struct kvm_vcpu *vcpu)
1212{
1213 u32 lvt0 = apic_get_reg(vcpu->arch.apic, APIC_LVT0);
1214 int r = 0;
1215
1216 if (!apic_hw_enabled(vcpu->arch.apic))
1217 r = 1;
1218 if ((lvt0 & APIC_LVT_MASKED) == 0 &&
1219 GET_APIC_DELIVERY_MODE(lvt0) == APIC_MODE_EXTINT)
1220 r = 1;
1221 return r;
1222}
1223
1224void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu)
1225{
1226 struct kvm_lapic *apic = vcpu->arch.apic;
1227
1228 if (apic && atomic_read(&apic->lapic_timer.pending) > 0) {
1229 if (kvm_apic_local_deliver(apic, APIC_LVTT))
1230 atomic_dec(&apic->lapic_timer.pending);
1231 }
1232}
1233
1234int kvm_get_apic_interrupt(struct kvm_vcpu *vcpu)
1235{
1236 int vector = kvm_apic_has_interrupt(vcpu);
1237 struct kvm_lapic *apic = vcpu->arch.apic;
1238
1239 if (vector == -1)
1240 return -1;
1241
1242 apic_set_vector(vector, apic->regs + APIC_ISR);
1243 apic_update_ppr(apic);
1244 apic_clear_irr(vector, apic);
1245 return vector;
1246}
1247
1248void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu)
1249{
1250 struct kvm_lapic *apic = vcpu->arch.apic;
1251
1252 apic->base_address = vcpu->arch.apic_base &
1253 MSR_IA32_APICBASE_BASE;
1254 kvm_apic_set_version(vcpu);
1255
1256 apic_update_ppr(apic);
1257 hrtimer_cancel(&apic->lapic_timer.timer);
1258 update_divide_count(apic);
1259 start_apic_timer(apic);
1260 apic->irr_pending = true;
1261 kvm_make_request(KVM_REQ_EVENT, vcpu);
1262}
1263
1264void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu)
1265{
1266 struct kvm_lapic *apic = vcpu->arch.apic;
1267 struct hrtimer *timer;
1268
1269 if (!apic)
1270 return;
1271
1272 timer = &apic->lapic_timer.timer;
1273 if (hrtimer_cancel(timer))
1274 hrtimer_start_expires(timer, HRTIMER_MODE_ABS);
1275}
1276
1277void kvm_lapic_sync_from_vapic(struct kvm_vcpu *vcpu)
1278{
1279 u32 data;
1280 void *vapic;
1281
1282 if (!irqchip_in_kernel(vcpu->kvm) || !vcpu->arch.apic->vapic_addr)
1283 return;
1284
1285 vapic = kmap_atomic(vcpu->arch.apic->vapic_page, KM_USER0);
1286 data = *(u32 *)(vapic + offset_in_page(vcpu->arch.apic->vapic_addr));
1287 kunmap_atomic(vapic, KM_USER0);
1288
1289 apic_set_tpr(vcpu->arch.apic, data & 0xff);
1290}
1291
1292void kvm_lapic_sync_to_vapic(struct kvm_vcpu *vcpu)
1293{
1294 u32 data, tpr;
1295 int max_irr, max_isr;
1296 struct kvm_lapic *apic;
1297 void *vapic;
1298
1299 if (!irqchip_in_kernel(vcpu->kvm) || !vcpu->arch.apic->vapic_addr)
1300 return;
1301
1302 apic = vcpu->arch.apic;
1303 tpr = apic_get_reg(apic, APIC_TASKPRI) & 0xff;
1304 max_irr = apic_find_highest_irr(apic);
1305 if (max_irr < 0)
1306 max_irr = 0;
1307 max_isr = apic_find_highest_isr(apic);
1308 if (max_isr < 0)
1309 max_isr = 0;
1310 data = (tpr & 0xff) | ((max_isr & 0xf0) << 8) | (max_irr << 24);
1311
1312 vapic = kmap_atomic(vcpu->arch.apic->vapic_page, KM_USER0);
1313 *(u32 *)(vapic + offset_in_page(vcpu->arch.apic->vapic_addr)) = data;
1314 kunmap_atomic(vapic, KM_USER0);
1315}
1316
1317void kvm_lapic_set_vapic_addr(struct kvm_vcpu *vcpu, gpa_t vapic_addr)
1318{
1319 if (!irqchip_in_kernel(vcpu->kvm))
1320 return;
1321
1322 vcpu->arch.apic->vapic_addr = vapic_addr;
1323}
1324
1325int kvm_x2apic_msr_write(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1326{
1327 struct kvm_lapic *apic = vcpu->arch.apic;
1328 u32 reg = (msr - APIC_BASE_MSR) << 4;
1329
1330 if (!irqchip_in_kernel(vcpu->kvm) || !apic_x2apic_mode(apic))
1331 return 1;
1332
1333
1334 if (msr == 0x830)
1335 apic_reg_write(apic, APIC_ICR2, (u32)(data >> 32));
1336 return apic_reg_write(apic, reg, (u32)data);
1337}
1338
1339int kvm_x2apic_msr_read(struct kvm_vcpu *vcpu, u32 msr, u64 *data)
1340{
1341 struct kvm_lapic *apic = vcpu->arch.apic;
1342 u32 reg = (msr - APIC_BASE_MSR) << 4, low, high = 0;
1343
1344 if (!irqchip_in_kernel(vcpu->kvm) || !apic_x2apic_mode(apic))
1345 return 1;
1346
1347 if (apic_reg_read(apic, reg, 4, &low))
1348 return 1;
1349 if (msr == 0x830)
1350 apic_reg_read(apic, APIC_ICR2, 4, &high);
1351
1352 *data = (((u64)high) << 32) | low;
1353
1354 return 0;
1355}
1356
1357int kvm_hv_vapic_msr_write(struct kvm_vcpu *vcpu, u32 reg, u64 data)
1358{
1359 struct kvm_lapic *apic = vcpu->arch.apic;
1360
1361 if (!irqchip_in_kernel(vcpu->kvm))
1362 return 1;
1363
1364
1365 if (reg == APIC_ICR)
1366 apic_reg_write(apic, APIC_ICR2, (u32)(data >> 32));
1367 return apic_reg_write(apic, reg, (u32)data);
1368}
1369
1370int kvm_hv_vapic_msr_read(struct kvm_vcpu *vcpu, u32 reg, u64 *data)
1371{
1372 struct kvm_lapic *apic = vcpu->arch.apic;
1373 u32 low, high = 0;
1374
1375 if (!irqchip_in_kernel(vcpu->kvm))
1376 return 1;
1377
1378 if (apic_reg_read(apic, reg, 4, &low))
1379 return 1;
1380 if (reg == APIC_ICR)
1381 apic_reg_read(apic, APIC_ICR2, 4, &high);
1382
1383 *data = (((u64)high) << 32) | low;
1384
1385 return 0;
1386}
1387
