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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 inline u32 apic_get_reg(struct kvm_lapic *apic, int reg_off)
72{
73 return *((u32 *) (apic->regs + reg_off));
74}
75
76static inline void apic_set_reg(struct kvm_lapic *apic, int reg_off, u32 val)
77{
78 *((u32 *) (apic->regs + reg_off)) = val;
79}
80
81static inline int apic_test_and_set_vector(int vec, void *bitmap)
82{
83 return test_and_set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
84}
85
86static inline int apic_test_and_clear_vector(int vec, void *bitmap)
87{
88 return test_and_clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
89}
90
91static inline void apic_set_vector(int vec, void *bitmap)
92{
93 set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
94}
95
96static inline void apic_clear_vector(int vec, void *bitmap)
97{
98 clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
99}
100
101static inline int apic_hw_enabled(struct kvm_lapic *apic)
102{
103 return (apic)->vcpu->arch.apic_base & MSR_IA32_APICBASE_ENABLE;
104}
105
106static inline int apic_sw_enabled(struct kvm_lapic *apic)
107{
108 return apic_get_reg(apic, APIC_SPIV) & APIC_SPIV_APIC_ENABLED;
109}
110
111static inline int apic_enabled(struct kvm_lapic *apic)
112{
113 return apic_sw_enabled(apic) && apic_hw_enabled(apic);
114}
115
116#define LVT_MASK \
117 (APIC_LVT_MASKED | APIC_SEND_PENDING | APIC_VECTOR_MASK)
118
119#define LINT_MASK \
120 (LVT_MASK | APIC_MODE_MASK | APIC_INPUT_POLARITY | \
121 APIC_LVT_REMOTE_IRR | APIC_LVT_LEVEL_TRIGGER)
122
123static inline int kvm_apic_id(struct kvm_lapic *apic)
124{
125 return (apic_get_reg(apic, APIC_ID) >> 24) & 0xff;
126}
127
128static inline int apic_lvt_enabled(struct kvm_lapic *apic, int lvt_type)
129{
130 return !(apic_get_reg(apic, lvt_type) & APIC_LVT_MASKED);
131}
132
133static inline int apic_lvt_vector(struct kvm_lapic *apic, int lvt_type)
134{
135 return apic_get_reg(apic, lvt_type) & APIC_VECTOR_MASK;
136}
137
138static inline int apic_lvtt_period(struct kvm_lapic *apic)
139{
140 return apic_get_reg(apic, APIC_LVTT) & APIC_LVT_TIMER_PERIODIC;
141}
142
143static inline int apic_lvt_nmi_mode(u32 lvt_val)
144{
145 return (lvt_val & (APIC_MODE_MASK | APIC_LVT_MASKED)) == APIC_DM_NMI;
146}
147
148void kvm_apic_set_version(struct kvm_vcpu *vcpu)
149{
150 struct kvm_lapic *apic = vcpu->arch.apic;
151 struct kvm_cpuid_entry2 *feat;
152 u32 v = APIC_VERSION;
153
154 if (!irqchip_in_kernel(vcpu->kvm))
155 return;
156
157 feat = kvm_find_cpuid_entry(apic->vcpu, 0x1, 0);
158 if (feat && (feat->ecx & (1 << (X86_FEATURE_X2APIC & 31))))
159 v |= APIC_LVR_DIRECTED_EOI;
160 apic_set_reg(apic, APIC_LVR, v);
161}
162
163static inline int apic_x2apic_mode(struct kvm_lapic *apic)
164{
165 return apic->vcpu->arch.apic_base & X2APIC_ENABLE;
166}
167
168static unsigned int apic_lvt_mask[APIC_LVT_NUM] = {
169 LVT_MASK | APIC_LVT_TIMER_PERIODIC,
170 LVT_MASK | APIC_MODE_MASK,
171 LVT_MASK | APIC_MODE_MASK,
172 LINT_MASK, LINT_MASK,
173 LVT_MASK
174};
175
176static int find_highest_vector(void *bitmap)
177{
178 u32 *word = bitmap;
179 int word_offset = MAX_APIC_VECTOR >> 5;
180
181 while ((word_offset != 0) && (word[(--word_offset) << 2] == 0))
182 continue;
183
184 if (likely(!word_offset && !word[0]))
185 return -1;
186 else
187 return fls(word[word_offset << 2]) - 1 + (word_offset << 5);
188}
189
190static inline int apic_test_and_set_irr(int vec, struct kvm_lapic *apic)
191{
192 apic->irr_pending = true;
193 return apic_test_and_set_vector(vec, apic->regs + APIC_IRR);
194}
195
196static inline int apic_search_irr(struct kvm_lapic *apic)
197{
198 return find_highest_vector(apic->regs + APIC_IRR);
199}
200
201static inline int apic_find_highest_irr(struct kvm_lapic *apic)
202{
203 int result;
204
205 if (!apic->irr_pending)
206 return -1;
207
208 result = apic_search_irr(apic);
209 ASSERT(result == -1 || result >= 16);
210
211 return result;
212}
213
214static inline void apic_clear_irr(int vec, struct kvm_lapic *apic)
215{
216 apic->irr_pending = false;
217 apic_clear_vector(vec, apic->regs + APIC_IRR);
218 if (apic_search_irr(apic) != -1)
219 apic->irr_pending = true;
220}
221
222int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu)
223{
224 struct kvm_lapic *apic = vcpu->arch.apic;
225 int highest_irr;
226
227
228
229
230
231
232 if (!apic)
233 return 0;
234 highest_irr = apic_find_highest_irr(apic);
235
236 return highest_irr;
237}
238
239static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
240 int vector, int level, int trig_mode);
241
242int kvm_apic_set_irq(struct kvm_vcpu *vcpu, struct kvm_lapic_irq *irq)
243{
244 struct kvm_lapic *apic = vcpu->arch.apic;
245
246 return __apic_accept_irq(apic, irq->delivery_mode, irq->vector,
247 irq->level, irq->trig_mode);
248}
249
250static inline int apic_find_highest_isr(struct kvm_lapic *apic)
251{
252 int result;
253
254 result = find_highest_vector(apic->regs + APIC_ISR);
255 ASSERT(result == -1 || result >= 16);
256
257 return result;
258}
259
260static void apic_update_ppr(struct kvm_lapic *apic)
261{
262 u32 tpr, isrv, ppr, old_ppr;
263 int isr;
264
265 old_ppr = apic_get_reg(apic, APIC_PROCPRI);
266 tpr = apic_get_reg(apic, APIC_TASKPRI);
267 isr = apic_find_highest_isr(apic);
268 isrv = (isr != -1) ? isr : 0;
269
270 if ((tpr & 0xf0) >= (isrv & 0xf0))
271 ppr = tpr & 0xff;
272 else
273 ppr = isrv & 0xf0;
274
275 apic_debug("vlapic %p, ppr 0x%x, isr 0x%x, isrv 0x%x",
276 apic, ppr, isr, isrv);
277
278 if (old_ppr != ppr) {
279 apic_set_reg(apic, APIC_PROCPRI, ppr);
280 if (ppr < old_ppr)
281 kvm_make_request(KVM_REQ_EVENT, apic->vcpu);
282 }
283}
284
285static void apic_set_tpr(struct kvm_lapic *apic, u32 tpr)
286{
287 apic_set_reg(apic, APIC_TASKPRI, tpr);
288 apic_update_ppr(apic);
289}
290
291int kvm_apic_match_physical_addr(struct kvm_lapic *apic, u16 dest)
292{
293 return dest == 0xff || kvm_apic_id(apic) == dest;
294}
295
296int kvm_apic_match_logical_addr(struct kvm_lapic *apic, u8 mda)
297{
298 int result = 0;
299 u32 logical_id;
300
301 if (apic_x2apic_mode(apic)) {
302 logical_id = apic_get_reg(apic, APIC_LDR);
303 return logical_id & mda;
304 }
305
306 logical_id = GET_APIC_LOGICAL_ID(apic_get_reg(apic, APIC_LDR));
307
308 switch (apic_get_reg(apic, APIC_DFR)) {
309 case APIC_DFR_FLAT:
310 if (logical_id & mda)
311 result = 1;
312 break;
313 case APIC_DFR_CLUSTER:
314 if (((logical_id >> 4) == (mda >> 0x4))
315 && (logical_id & mda & 0xf))
316 result = 1;
317 break;
318 default:
319 printk(KERN_WARNING "Bad DFR vcpu %d: %08x\n",
320 apic->vcpu->vcpu_id, apic_get_reg(apic, APIC_DFR));
321 break;
322 }
323
324 return result;
325}
326
327int kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
328 int short_hand, int dest, int dest_mode)
329{
330 int result = 0;
331 struct kvm_lapic *target = vcpu->arch.apic;
332
333 apic_debug("target %p, source %p, dest 0x%x, "
334 "dest_mode 0x%x, short_hand 0x%x\n",
335 target, source, dest, dest_mode, short_hand);
336
337 ASSERT(target);
338 switch (short_hand) {
339 case APIC_DEST_NOSHORT:
340 if (dest_mode == 0)
341
342 result = kvm_apic_match_physical_addr(target, dest);
343 else
344
345 result = kvm_apic_match_logical_addr(target, dest);
346 break;
347 case APIC_DEST_SELF:
348 result = (target == source);
349 break;
350 case APIC_DEST_ALLINC:
351 result = 1;
352 break;
353 case APIC_DEST_ALLBUT:
354 result = (target != source);
355 break;
356 default:
357 printk(KERN_WARNING "Bad dest shorthand value %x\n",
358 short_hand);
359 break;
360 }
361
362 return result;
363}
364
365
366
367
368
369static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
370 int vector, int level, int trig_mode)
371{
372 int result = 0;
373 struct kvm_vcpu *vcpu = apic->vcpu;
374
375 switch (delivery_mode) {
376 case APIC_DM_LOWEST:
377 vcpu->arch.apic_arb_prio++;
378 case APIC_DM_FIXED:
379
380 if (unlikely(!apic_enabled(apic)))
381 break;
382
383 if (trig_mode) {
384 apic_debug("level trig mode for vector %d", vector);
385 apic_set_vector(vector, apic->regs + APIC_TMR);
386 } else
387 apic_clear_vector(vector, apic->regs + APIC_TMR);
388
389 result = !apic_test_and_set_irr(vector, apic);
390 trace_kvm_apic_accept_irq(vcpu->vcpu_id, delivery_mode,
391 trig_mode, vector, !result);
392 if (!result) {
393 if (trig_mode)
394 apic_debug("level trig mode repeatedly for "
395 "vector %d", vector);
396 break;
397 }
398
399 kvm_make_request(KVM_REQ_EVENT, vcpu);
400 kvm_vcpu_kick(vcpu);
401 break;
402
403 case APIC_DM_REMRD:
404 printk(KERN_DEBUG "Ignoring delivery mode 3\n");
405 break;
406
407 case APIC_DM_SMI:
408 printk(KERN_DEBUG "Ignoring guest SMI\n");
409 break;
410
411 case APIC_DM_NMI:
412 result = 1;
413 kvm_inject_nmi(vcpu);
414 kvm_vcpu_kick(vcpu);
415 break;
416
417 case APIC_DM_INIT:
418 if (level) {
419 result = 1;
420 vcpu->arch.mp_state = KVM_MP_STATE_INIT_RECEIVED;
421 kvm_make_request(KVM_REQ_EVENT, vcpu);
422 kvm_vcpu_kick(vcpu);
423 } else {
424 apic_debug("Ignoring de-assert INIT to vcpu %d\n",
425 vcpu->vcpu_id);
426 }
427 break;
428
429 case APIC_DM_STARTUP:
430 apic_debug("SIPI to vcpu %d vector 0x%02x\n",
431 vcpu->vcpu_id, vector);
432 if (vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) {
433 result = 1;
434 vcpu->arch.sipi_vector = vector;
435 vcpu->arch.mp_state = KVM_MP_STATE_SIPI_RECEIVED;
436 kvm_make_request(KVM_REQ_EVENT, vcpu);
437 kvm_vcpu_kick(vcpu);
438 }
439 break;
440
441 case APIC_DM_EXTINT:
442
443
444
445
446
447 break;
448
449 default:
450 printk(KERN_ERR "TODO: unsupported delivery mode %x\n",
451 delivery_mode);
452 break;
453 }
454 return result;
455}
456
457int kvm_apic_compare_prio(struct kvm_vcpu *vcpu1, struct kvm_vcpu *vcpu2)
458{
459 return vcpu1->arch.apic_arb_prio - vcpu2->arch.apic_arb_prio;
460}
461
462static void apic_set_eoi(struct kvm_lapic *apic)
463{
464 int vector = apic_find_highest_isr(apic);
465 int trigger_mode;
466
467
468
469
470 if (vector == -1)
471 return;
472
473 apic_clear_vector(vector, apic->regs + APIC_ISR);
474 apic_update_ppr(apic);
475
476 if (apic_test_and_clear_vector(vector, apic->regs + APIC_TMR))
477 trigger_mode = IOAPIC_LEVEL_TRIG;
478 else
479 trigger_mode = IOAPIC_EDGE_TRIG;
480 if (!(apic_get_reg(apic, APIC_SPIV) & APIC_SPIV_DIRECTED_EOI))
481 kvm_ioapic_update_eoi(apic->vcpu->kvm, vector, trigger_mode);
482 kvm_make_request(KVM_REQ_EVENT, apic->vcpu);
483}
484
485static void apic_send_ipi(struct kvm_lapic *apic)
486{
487 u32 icr_low = apic_get_reg(apic, APIC_ICR);
488 u32 icr_high = apic_get_reg(apic, APIC_ICR2);
489 struct kvm_lapic_irq irq;
490
491 irq.vector = icr_low & APIC_VECTOR_MASK;
492 irq.delivery_mode = icr_low & APIC_MODE_MASK;
493 irq.dest_mode = icr_low & APIC_DEST_MASK;
494 irq.level = icr_low & APIC_INT_ASSERT;
495 irq.trig_mode = icr_low & APIC_INT_LEVELTRIG;
496 irq.shorthand = icr_low & APIC_SHORT_MASK;
497 if (apic_x2apic_mode(apic))
498 irq.dest_id = icr_high;
499 else
500 irq.dest_id = GET_APIC_DEST_FIELD(icr_high);
501
502 trace_kvm_apic_ipi(icr_low, irq.dest_id);
503
504 apic_debug("icr_high 0x%x, icr_low 0x%x, "
505 "short_hand 0x%x, dest 0x%x, trig_mode 0x%x, level 0x%x, "
506 "dest_mode 0x%x, delivery_mode 0x%x, vector 0x%x\n",
507 icr_high, icr_low, irq.shorthand, irq.dest_id,
508 irq.trig_mode, irq.level, irq.dest_mode, irq.delivery_mode,
509 irq.vector);
510
511 kvm_irq_delivery_to_apic(apic->vcpu->kvm, apic, &irq);
512}
513
514static u32 apic_get_tmcct(struct kvm_lapic *apic)
515{
516 ktime_t remaining;
517 s64 ns;
518 u32 tmcct;
519
520 ASSERT(apic != NULL);
521
522
523 if (apic_get_reg(apic, APIC_TMICT) == 0)
524 return 0;
525
526 remaining = hrtimer_get_remaining(&apic->lapic_timer.timer);
527 if (ktime_to_ns(remaining) < 0)
528 remaining = ktime_set(0, 0);
529
530 ns = mod_64(ktime_to_ns(remaining), apic->lapic_timer.period);
531 tmcct = div64_u64(ns,
532 (APIC_BUS_CYCLE_NS * apic->divide_count));
533
534 return tmcct;
535}
536
537static void __report_tpr_access(struct kvm_lapic *apic, bool write)
538{
539 struct kvm_vcpu *vcpu = apic->vcpu;
540 struct kvm_run *run = vcpu->run;
541
542 kvm_make_request(KVM_REQ_REPORT_TPR_ACCESS, vcpu);
543 run->tpr_access.rip = kvm_rip_read(vcpu);
544 run->tpr_access.is_write = write;
545}
546
547static inline void report_tpr_access(struct kvm_lapic *apic, bool write)
548{
549 if (apic->vcpu->arch.tpr_access_reporting)
550 __report_tpr_access(apic, write);
551}
552
553static u32 __apic_read(struct kvm_lapic *apic, unsigned int offset)
554{
555 u32 val = 0;
556
557 if (offset >= LAPIC_MMIO_LENGTH)
558 return 0;
559
560 switch (offset) {
561 case APIC_ID:
562 if (apic_x2apic_mode(apic))
563 val = kvm_apic_id(apic);
564 else
565 val = kvm_apic_id(apic) << 24;
566 break;
567 case APIC_ARBPRI:
568 printk(KERN_WARNING "Access APIC ARBPRI register "
569 "which is for P6\n");
570 break;
571
572 case APIC_TMCCT:
573 val = apic_get_tmcct(apic);
574 break;
575
576 case APIC_TASKPRI:
577 report_tpr_access(apic, false);
578
579 default:
580 apic_update_ppr(apic);
581 val = apic_get_reg(apic, offset);
582 break;
583 }
584
585 return val;
586}
587
588static inline struct kvm_lapic *to_lapic(struct kvm_io_device *dev)
589{
590 return container_of(dev, struct kvm_lapic, dev);
591}
592
593static int apic_reg_read(struct kvm_lapic *apic, u32 offset, int len,
594 void *data)
595{
596 unsigned char alignment = offset & 0xf;
597 u32 result;
598
599 static const u64 rmask = 0x43ff01ffffffe70cULL;
600
601 if ((alignment + len) > 4) {
602 apic_debug("KVM_APIC_READ: alignment error %x %d\n",
603 offset, len);
604 return 1;
605 }
606
607 if (offset > 0x3f0 || !(rmask & (1ULL << (offset >> 4)))) {
608 apic_debug("KVM_APIC_READ: read reserved register %x\n",
609 offset);
610 return 1;
611 }
612
613 result = __apic_read(apic, offset & ~0xf);
614
615 trace_kvm_apic_read(offset, result);
616
617 switch (len) {
618 case 1:
619 case 2:
620 case 4:
621 memcpy(data, (char *)&result + alignment, len);
622 break;
623 default:
624 printk(KERN_ERR "Local APIC read with len = %x, "
625 "should be 1,2, or 4 instead\n", len);
626 break;
627 }
628 return 0;
629}
630
631static int apic_mmio_in_range(struct kvm_lapic *apic, gpa_t addr)
632{
633 return apic_hw_enabled(apic) &&
634 addr >= apic->base_address &&
635 addr < apic->base_address + LAPIC_MMIO_LENGTH;
636}
637
638static int apic_mmio_read(struct kvm_io_device *this,
639 gpa_t address, int len, void *data)
640{
641 struct kvm_lapic *apic = to_lapic(this);
642 u32 offset = address - apic->base_address;
643
644 if (!apic_mmio_in_range(apic, address))
645 return -EOPNOTSUPP;
646
647 apic_reg_read(apic, offset, len, data);
648
649 return 0;
650}
651
652static void update_divide_count(struct kvm_lapic *apic)
653{
654 u32 tmp1, tmp2, tdcr;
655
656 tdcr = apic_get_reg(apic, APIC_TDCR);
657 tmp1 = tdcr & 0xf;
658 tmp2 = ((tmp1 & 0x3) | ((tmp1 & 0x8) >> 1)) + 1;
659 apic->divide_count = 0x1 << (tmp2 & 0x7);
660
661 apic_debug("timer divide count is 0x%x\n",
662 apic->divide_count);
663}
664
665static void start_apic_timer(struct kvm_lapic *apic)
666{
667 ktime_t now = apic->lapic_timer.timer.base->get_time();
668
669 apic->lapic_timer.period = (u64)apic_get_reg(apic, APIC_TMICT) *
670 APIC_BUS_CYCLE_NS * apic->divide_count;
671 atomic_set(&apic->lapic_timer.pending, 0);
672
673 if (!apic->lapic_timer.period)
674 return;
675
676
677
678
679
680 if (apic_lvtt_period(apic)) {
681 if (apic->lapic_timer.period < NSEC_PER_MSEC/2)
682 apic->lapic_timer.period = NSEC_PER_MSEC/2;
683 }
684
685 hrtimer_start(&apic->lapic_timer.timer,
686 ktime_add_ns(now, apic->lapic_timer.period),
687 HRTIMER_MODE_ABS);
688
689 apic_debug("%s: bus cycle is %" PRId64 "ns, now 0x%016"
690 PRIx64 ", "
691 "timer initial count 0x%x, period %lldns, "
692 "expire @ 0x%016" PRIx64 ".\n", __func__,
693 APIC_BUS_CYCLE_NS, ktime_to_ns(now),
694 apic_get_reg(apic, APIC_TMICT),
695 apic->lapic_timer.period,
696 ktime_to_ns(ktime_add_ns(now,
697 apic->lapic_timer.period)));
698}
699
700static void apic_manage_nmi_watchdog(struct kvm_lapic *apic, u32 lvt0_val)
701{
702 int nmi_wd_enabled = apic_lvt_nmi_mode(apic_get_reg(apic, APIC_LVT0));
703
704 if (apic_lvt_nmi_mode(lvt0_val)) {
705 if (!nmi_wd_enabled) {
706 apic_debug("Receive NMI setting on APIC_LVT0 "
707 "for cpu %d\n", apic->vcpu->vcpu_id);
708 apic->vcpu->kvm->arch.vapics_in_nmi_mode++;
709 }
710 } else if (nmi_wd_enabled)
711 apic->vcpu->kvm->arch.vapics_in_nmi_mode--;
712}
713
714static int apic_reg_write(struct kvm_lapic *apic, u32 reg, u32 val)
715{
716 int ret = 0;
717
718 trace_kvm_apic_write(reg, val);
719
720 switch (reg) {
721 case APIC_ID:
722 if (!apic_x2apic_mode(apic))
723 apic_set_reg(apic, APIC_ID, val);
724 else
725 ret = 1;
726 break;
727
728 case APIC_TASKPRI:
729 report_tpr_access(apic, true);
730 apic_set_tpr(apic, val & 0xff);
731 break;
732
733 case APIC_EOI:
734 apic_set_eoi(apic);
735 break;
736
737 case APIC_LDR:
738 if (!apic_x2apic_mode(apic))
739 apic_set_reg(apic, APIC_LDR, val & APIC_LDR_MASK);
740 else
741 ret = 1;
742 break;
743
744 case APIC_DFR:
745 if (!apic_x2apic_mode(apic))
746 apic_set_reg(apic, APIC_DFR, val | 0x0FFFFFFF);
747 else
748 ret = 1;
749 break;
750
751 case APIC_SPIV: {
752 u32 mask = 0x3ff;
753 if (apic_get_reg(apic, APIC_LVR) & APIC_LVR_DIRECTED_EOI)
754 mask |= APIC_SPIV_DIRECTED_EOI;
755 apic_set_reg(apic, APIC_SPIV, val & mask);
756 if (!(val & APIC_SPIV_APIC_ENABLED)) {
757 int i;
758 u32 lvt_val;
759
760 for (i = 0; i < APIC_LVT_NUM; i++) {
761 lvt_val = apic_get_reg(apic,
762 APIC_LVTT + 0x10 * i);
763 apic_set_reg(apic, APIC_LVTT + 0x10 * i,
764 lvt_val | APIC_LVT_MASKED);
765 }
766 atomic_set(&apic->lapic_timer.pending, 0);
767
768 }
769 break;
770 }
771 case APIC_ICR:
772
773 apic_set_reg(apic, APIC_ICR, val & ~(1 << 12));
774 apic_send_ipi(apic);
775 break;
776
777 case APIC_ICR2:
778 if (!apic_x2apic_mode(apic))
779 val &= 0xff000000;
780 apic_set_reg(apic, APIC_ICR2, val);
781 break;
782
783 case APIC_LVT0:
784 apic_manage_nmi_watchdog(apic, val);
785 case APIC_LVTT:
786 case APIC_LVTTHMR:
787 case APIC_LVTPC:
788 case APIC_LVT1:
789 case APIC_LVTERR:
790
791 if (!apic_sw_enabled(apic))
792 val |= APIC_LVT_MASKED;
793
794 val &= apic_lvt_mask[(reg - APIC_LVTT) >> 4];
795 apic_set_reg(apic, reg, val);
796
797 break;
798
799 case APIC_TMICT:
800 hrtimer_cancel(&apic->lapic_timer.timer);
801 apic_set_reg(apic, APIC_TMICT, val);
802 start_apic_timer(apic);
803 break;
804
805 case APIC_TDCR:
806 if (val & 4)
807 printk(KERN_ERR "KVM_WRITE:TDCR %x\n", val);
808 apic_set_reg(apic, APIC_TDCR, val);
809 update_divide_count(apic);
810 break;
811
812 case APIC_ESR:
813 if (apic_x2apic_mode(apic) && val != 0) {
814 printk(KERN_ERR "KVM_WRITE:ESR not zero %x\n", val);
815 ret = 1;
816 }
817 break;
818
819 case APIC_SELF_IPI:
820 if (apic_x2apic_mode(apic)) {
821 apic_reg_write(apic, APIC_ICR, 0x40000 | (val & 0xff));
822 } else
823 ret = 1;
824 break;
825 default:
826 ret = 1;
827 break;
828 }
829 if (ret)
830 apic_debug("Local APIC Write to read-only register %x\n", reg);
831 return ret;
832}
833
834static int apic_mmio_write(struct kvm_io_device *this,
835 gpa_t address, int len, const void *data)
836{
837 struct kvm_lapic *apic = to_lapic(this);
838 unsigned int offset = address - apic->base_address;
839 u32 val;
840
841 if (!apic_mmio_in_range(apic, address))
842 return -EOPNOTSUPP;
843
844
845
846
847
848
849 if (len != 4 || (offset & 0xf)) {
850
851 apic_debug("apic write: bad size=%d %lx\n", len, (long)address);
852 return 0;
853 }
854
855 val = *(u32*)data;
856
857
858 if (offset != APIC_EOI)
859 apic_debug("%s: offset 0x%x with length 0x%x, and value is "
860 "0x%x\n", __func__, offset, len, val);
861
862 apic_reg_write(apic, offset & 0xff0, val);
863
864 return 0;
865}
866
867void kvm_free_lapic(struct kvm_vcpu *vcpu)
868{
869 if (!vcpu->arch.apic)
870 return;
871
872 hrtimer_cancel(&vcpu->arch.apic->lapic_timer.timer);
873
874 if (vcpu->arch.apic->regs)
875 free_page((unsigned long)vcpu->arch.apic->regs);
876
877 kfree(vcpu->arch.apic);
878}
879
880
881
882
883
884
885
886void kvm_lapic_set_tpr(struct kvm_vcpu *vcpu, unsigned long cr8)
887{
888 struct kvm_lapic *apic = vcpu->arch.apic;
889
890 if (!apic)
891 return;
892 apic_set_tpr(apic, ((cr8 & 0x0f) << 4)
893 | (apic_get_reg(apic, APIC_TASKPRI) & 4));
894}
895
896u64 kvm_lapic_get_cr8(struct kvm_vcpu *vcpu)
897{
898 struct kvm_lapic *apic = vcpu->arch.apic;
899 u64 tpr;
900
901 if (!apic)
902 return 0;
903 tpr = (u64) apic_get_reg(apic, APIC_TASKPRI);
904
905 return (tpr & 0xf0) >> 4;
906}
907
908void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value)
909{
910 struct kvm_lapic *apic = vcpu->arch.apic;
911
912 if (!apic) {
913 value |= MSR_IA32_APICBASE_BSP;
914 vcpu->arch.apic_base = value;
915 return;
916 }
917
918 if (!kvm_vcpu_is_bsp(apic->vcpu))
919 value &= ~MSR_IA32_APICBASE_BSP;
920
921 vcpu->arch.apic_base = value;
922 if (apic_x2apic_mode(apic)) {
923 u32 id = kvm_apic_id(apic);
924 u32 ldr = ((id & ~0xf) << 16) | (1 << (id & 0xf));
925 apic_set_reg(apic, APIC_LDR, ldr);
926 }
927 apic->base_address = apic->vcpu->arch.apic_base &
928 MSR_IA32_APICBASE_BASE;
929
930
931 apic_debug("apic base msr is 0x%016" PRIx64 ", and base address is "
932 "0x%lx.\n", apic->vcpu->arch.apic_base, apic->base_address);
933
934}
935
936void kvm_lapic_reset(struct kvm_vcpu *vcpu)
937{
938 struct kvm_lapic *apic;
939 int i;
940
941 apic_debug("%s\n", __func__);
942
943 ASSERT(vcpu);
944 apic = vcpu->arch.apic;
945 ASSERT(apic != NULL);
946
947
948 hrtimer_cancel(&apic->lapic_timer.timer);
949
950 apic_set_reg(apic, APIC_ID, vcpu->vcpu_id << 24);
951 kvm_apic_set_version(apic->vcpu);
952
953 for (i = 0; i < APIC_LVT_NUM; i++)
954 apic_set_reg(apic, APIC_LVTT + 0x10 * i, APIC_LVT_MASKED);
955 apic_set_reg(apic, APIC_LVT0,
956 SET_APIC_DELIVERY_MODE(0, APIC_MODE_EXTINT));
957
958 apic_set_reg(apic, APIC_DFR, 0xffffffffU);
959 apic_set_reg(apic, APIC_SPIV, 0xff);
960 apic_set_reg(apic, APIC_TASKPRI, 0);
961 apic_set_reg(apic, APIC_LDR, 0);
962 apic_set_reg(apic, APIC_ESR, 0);
963 apic_set_reg(apic, APIC_ICR, 0);
964 apic_set_reg(apic, APIC_ICR2, 0);
965 apic_set_reg(apic, APIC_TDCR, 0);
966 apic_set_reg(apic, APIC_TMICT, 0);
967 for (i = 0; i < 8; i++) {
968 apic_set_reg(apic, APIC_IRR + 0x10 * i, 0);
969 apic_set_reg(apic, APIC_ISR + 0x10 * i, 0);
970 apic_set_reg(apic, APIC_TMR + 0x10 * i, 0);
971 }
972 apic->irr_pending = false;
973 update_divide_count(apic);
974 atomic_set(&apic->lapic_timer.pending, 0);
975 if (kvm_vcpu_is_bsp(vcpu))
976 vcpu->arch.apic_base |= MSR_IA32_APICBASE_BSP;
977 apic_update_ppr(apic);
978
979 vcpu->arch.apic_arb_prio = 0;
980
981 apic_debug(KERN_INFO "%s: vcpu=%p, id=%d, base_msr="
982 "0x%016" PRIx64 ", base_address=0x%0lx.\n", __func__,
983 vcpu, kvm_apic_id(apic),
984 vcpu->arch.apic_base, apic->base_address);
985}
986
987bool kvm_apic_present(struct kvm_vcpu *vcpu)
988{
989 return vcpu->arch.apic && apic_hw_enabled(vcpu->arch.apic);
990}
991
992int kvm_lapic_enabled(struct kvm_vcpu *vcpu)
993{
994 return kvm_apic_present(vcpu) && apic_sw_enabled(vcpu->arch.apic);
995}
996
997
998
999
1000
1001
1002
1003static bool lapic_is_periodic(struct kvm_timer *ktimer)
1004{
1005 struct kvm_lapic *apic = container_of(ktimer, struct kvm_lapic,
1006 lapic_timer);
1007 return apic_lvtt_period(apic);
1008}
1009
1010int apic_has_pending_timer(struct kvm_vcpu *vcpu)
1011{
1012 struct kvm_lapic *lapic = vcpu->arch.apic;
1013
1014 if (lapic && apic_enabled(lapic) && apic_lvt_enabled(lapic, APIC_LVTT))
1015 return atomic_read(&lapic->lapic_timer.pending);
1016
1017 return 0;
1018}
1019
1020static int kvm_apic_local_deliver(struct kvm_lapic *apic, int lvt_type)
1021{
1022 u32 reg = apic_get_reg(apic, lvt_type);
1023 int vector, mode, trig_mode;
1024
1025 if (apic_hw_enabled(apic) && !(reg & APIC_LVT_MASKED)) {
1026 vector = reg & APIC_VECTOR_MASK;
1027 mode = reg & APIC_MODE_MASK;
1028 trig_mode = reg & APIC_LVT_LEVEL_TRIGGER;
1029 return __apic_accept_irq(apic, mode, vector, 1, trig_mode);
1030 }
1031 return 0;
1032}
1033
1034void kvm_apic_nmi_wd_deliver(struct kvm_vcpu *vcpu)
1035{
1036 struct kvm_lapic *apic = vcpu->arch.apic;
1037
1038 if (apic)
1039 kvm_apic_local_deliver(apic, APIC_LVT0);
1040}
1041
1042static struct kvm_timer_ops lapic_timer_ops = {
1043 .is_periodic = lapic_is_periodic,
1044};
1045
1046static const struct kvm_io_device_ops apic_mmio_ops = {
1047 .read = apic_mmio_read,
1048 .write = apic_mmio_write,
1049};
1050
1051int kvm_create_lapic(struct kvm_vcpu *vcpu)
1052{
1053 struct kvm_lapic *apic;
1054
1055 ASSERT(vcpu != NULL);
1056 apic_debug("apic_init %d\n", vcpu->vcpu_id);
1057
1058 apic = kzalloc(sizeof(*apic), GFP_KERNEL);
1059 if (!apic)
1060 goto nomem;
1061
1062 vcpu->arch.apic = apic;
1063
1064 apic->regs = (void *)get_zeroed_page(GFP_KERNEL);
1065 if (!apic->regs) {
1066 printk(KERN_ERR "malloc apic regs error for vcpu %x\n",
1067 vcpu->vcpu_id);
1068 goto nomem_free_apic;
1069 }
1070 apic->vcpu = vcpu;
1071
1072 hrtimer_init(&apic->lapic_timer.timer, CLOCK_MONOTONIC,
1073 HRTIMER_MODE_ABS);
1074 apic->lapic_timer.timer.function = kvm_timer_fn;
1075 apic->lapic_timer.t_ops = &lapic_timer_ops;
1076 apic->lapic_timer.kvm = vcpu->kvm;
1077 apic->lapic_timer.vcpu = vcpu;
1078
1079 apic->base_address = APIC_DEFAULT_PHYS_BASE;
1080 vcpu->arch.apic_base = APIC_DEFAULT_PHYS_BASE;
1081
1082 kvm_lapic_reset(vcpu);
1083 kvm_iodevice_init(&apic->dev, &apic_mmio_ops);
1084
1085 return 0;
1086nomem_free_apic:
1087 kfree(apic);
1088nomem:
1089 return -ENOMEM;
1090}
1091
1092int kvm_apic_has_interrupt(struct kvm_vcpu *vcpu)
1093{
1094 struct kvm_lapic *apic = vcpu->arch.apic;
1095 int highest_irr;
1096
1097 if (!apic || !apic_enabled(apic))
1098 return -1;
1099
1100 apic_update_ppr(apic);
1101 highest_irr = apic_find_highest_irr(apic);
1102 if ((highest_irr == -1) ||
1103 ((highest_irr & 0xF0) <= apic_get_reg(apic, APIC_PROCPRI)))
1104 return -1;
1105 return highest_irr;
1106}
1107
1108int kvm_apic_accept_pic_intr(struct kvm_vcpu *vcpu)
1109{
1110 u32 lvt0 = apic_get_reg(vcpu->arch.apic, APIC_LVT0);
1111 int r = 0;
1112
1113 if (!apic_hw_enabled(vcpu->arch.apic))
1114 r = 1;
1115 if ((lvt0 & APIC_LVT_MASKED) == 0 &&
1116 GET_APIC_DELIVERY_MODE(lvt0) == APIC_MODE_EXTINT)
1117 r = 1;
1118 return r;
1119}
1120
1121void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu)
1122{
1123 struct kvm_lapic *apic = vcpu->arch.apic;
1124
1125 if (apic && atomic_read(&apic->lapic_timer.pending) > 0) {
1126 if (kvm_apic_local_deliver(apic, APIC_LVTT))
1127 atomic_dec(&apic->lapic_timer.pending);
1128 }
1129}
1130
1131int kvm_get_apic_interrupt(struct kvm_vcpu *vcpu)
1132{
1133 int vector = kvm_apic_has_interrupt(vcpu);
1134 struct kvm_lapic *apic = vcpu->arch.apic;
1135
1136 if (vector == -1)
1137 return -1;
1138
1139 apic_set_vector(vector, apic->regs + APIC_ISR);
1140 apic_update_ppr(apic);
1141 apic_clear_irr(vector, apic);
1142 return vector;
1143}
1144
1145void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu)
1146{
1147 struct kvm_lapic *apic = vcpu->arch.apic;
1148
1149 apic->base_address = vcpu->arch.apic_base &
1150 MSR_IA32_APICBASE_BASE;
1151 kvm_apic_set_version(vcpu);
1152
1153 apic_update_ppr(apic);
1154 hrtimer_cancel(&apic->lapic_timer.timer);
1155 update_divide_count(apic);
1156 start_apic_timer(apic);
1157 apic->irr_pending = true;
1158 kvm_make_request(KVM_REQ_EVENT, vcpu);
1159}
1160
1161void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu)
1162{
1163 struct kvm_lapic *apic = vcpu->arch.apic;
1164 struct hrtimer *timer;
1165
1166 if (!apic)
1167 return;
1168
1169 timer = &apic->lapic_timer.timer;
1170 if (hrtimer_cancel(timer))
1171 hrtimer_start_expires(timer, HRTIMER_MODE_ABS);
1172}
1173
1174void kvm_lapic_sync_from_vapic(struct kvm_vcpu *vcpu)
1175{
1176 u32 data;
1177 void *vapic;
1178
1179 if (!irqchip_in_kernel(vcpu->kvm) || !vcpu->arch.apic->vapic_addr)
1180 return;
1181
1182 vapic = kmap_atomic(vcpu->arch.apic->vapic_page, KM_USER0);
1183 data = *(u32 *)(vapic + offset_in_page(vcpu->arch.apic->vapic_addr));
1184 kunmap_atomic(vapic, KM_USER0);
1185
1186 apic_set_tpr(vcpu->arch.apic, data & 0xff);
1187}
1188
1189void kvm_lapic_sync_to_vapic(struct kvm_vcpu *vcpu)
1190{
1191 u32 data, tpr;
1192 int max_irr, max_isr;
1193 struct kvm_lapic *apic;
1194 void *vapic;
1195
1196 if (!irqchip_in_kernel(vcpu->kvm) || !vcpu->arch.apic->vapic_addr)
1197 return;
1198
1199 apic = vcpu->arch.apic;
1200 tpr = apic_get_reg(apic, APIC_TASKPRI) & 0xff;
1201 max_irr = apic_find_highest_irr(apic);
1202 if (max_irr < 0)
1203 max_irr = 0;
1204 max_isr = apic_find_highest_isr(apic);
1205 if (max_isr < 0)
1206 max_isr = 0;
1207 data = (tpr & 0xff) | ((max_isr & 0xf0) << 8) | (max_irr << 24);
1208
1209 vapic = kmap_atomic(vcpu->arch.apic->vapic_page, KM_USER0);
1210 *(u32 *)(vapic + offset_in_page(vcpu->arch.apic->vapic_addr)) = data;
1211 kunmap_atomic(vapic, KM_USER0);
1212}
1213
1214void kvm_lapic_set_vapic_addr(struct kvm_vcpu *vcpu, gpa_t vapic_addr)
1215{
1216 if (!irqchip_in_kernel(vcpu->kvm))
1217 return;
1218
1219 vcpu->arch.apic->vapic_addr = vapic_addr;
1220}
1221
1222int kvm_x2apic_msr_write(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1223{
1224 struct kvm_lapic *apic = vcpu->arch.apic;
1225 u32 reg = (msr - APIC_BASE_MSR) << 4;
1226
1227 if (!irqchip_in_kernel(vcpu->kvm) || !apic_x2apic_mode(apic))
1228 return 1;
1229
1230
1231 if (msr == 0x830)
1232 apic_reg_write(apic, APIC_ICR2, (u32)(data >> 32));
1233 return apic_reg_write(apic, reg, (u32)data);
1234}
1235
1236int kvm_x2apic_msr_read(struct kvm_vcpu *vcpu, u32 msr, u64 *data)
1237{
1238 struct kvm_lapic *apic = vcpu->arch.apic;
1239 u32 reg = (msr - APIC_BASE_MSR) << 4, low, high = 0;
1240
1241 if (!irqchip_in_kernel(vcpu->kvm) || !apic_x2apic_mode(apic))
1242 return 1;
1243
1244 if (apic_reg_read(apic, reg, 4, &low))
1245 return 1;
1246 if (msr == 0x830)
1247 apic_reg_read(apic, APIC_ICR2, 4, &high);
1248
1249 *data = (((u64)high) << 32) | low;
1250
1251 return 0;
1252}
1253
1254int kvm_hv_vapic_msr_write(struct kvm_vcpu *vcpu, u32 reg, u64 data)
1255{
1256 struct kvm_lapic *apic = vcpu->arch.apic;
1257
1258 if (!irqchip_in_kernel(vcpu->kvm))
1259 return 1;
1260
1261
1262 if (reg == APIC_ICR)
1263 apic_reg_write(apic, APIC_ICR2, (u32)(data >> 32));
1264 return apic_reg_write(apic, reg, (u32)data);
1265}
1266
1267int kvm_hv_vapic_msr_read(struct kvm_vcpu *vcpu, u32 reg, u64 *data)
1268{
1269 struct kvm_lapic *apic = vcpu->arch.apic;
1270 u32 low, high = 0;
1271
1272 if (!irqchip_in_kernel(vcpu->kvm))
1273 return 1;
1274
1275 if (apic_reg_read(apic, reg, 4, &low))
1276 return 1;
1277 if (reg == APIC_ICR)
1278 apic_reg_read(apic, APIC_ICR2, 4, &high);
1279
1280 *data = (((u64)high) << 32) | low;
1281
1282 return 0;
1283}
1284
