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Merge tag 'clk-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[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 * Copyright 2009 Red Hat, Inc. and/or its affiliates.
9 *
10 * Authors:
11 * Dor Laor <dor.laor@qumranet.com>
12 * Gregory Haskins <ghaskins@novell.com>
13 * Yaozu (Eddie) Dong <eddie.dong@intel.com>
14 *
15 * Based on Xen 3.1 code, Copyright (c) 2004, Intel Corporation.
16 *
17 * This work is licensed under the terms of the GNU GPL, version 2. See
18 * the COPYING file in the top-level directory.
19 */
20
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 <asm/delay.h>
37 #include <linux/atomic.h>
38 #include <linux/jump_label.h>
39 #include "kvm_cache_regs.h"
40 #include "irq.h"
41 #include "trace.h"
42 #include "x86.h"
43 #include "cpuid.h"
44 #include "hyperv.h"
45
46 #ifndef CONFIG_X86_64
47 #define mod_64(x, y) ((x) - (y) * div64_u64(x, y))
48 #else
49 #define mod_64(x, y) ((x) % (y))
50 #endif
51
52 #define PRId64 "d"
53 #define PRIx64 "llx"
54 #define PRIu64 "u"
55 #define PRIo64 "o"
56
57 #define APIC_BUS_CYCLE_NS 1
58
59 /* #define apic_debug(fmt,arg...) printk(KERN_WARNING fmt,##arg) */
60 #define apic_debug(fmt, arg...)
61
62 #define APIC_LVT_NUM 6
63 /* 14 is the version for Xeon and Pentium 8.4.8*/
64 #define APIC_VERSION (0x14UL | ((APIC_LVT_NUM - 1) << 16))
65 #define LAPIC_MMIO_LENGTH (1 << 12)
66 /* followed define is not in apicdef.h */
67 #define APIC_SHORT_MASK 0xc0000
68 #define APIC_DEST_NOSHORT 0x0
69 #define APIC_DEST_MASK 0x800
70 #define MAX_APIC_VECTOR 256
71 #define APIC_VECTORS_PER_REG 32
72
73 #define APIC_BROADCAST 0xFF
74 #define X2APIC_BROADCAST 0xFFFFFFFFul
75
76 #define VEC_POS(v) ((v) & (32 - 1))
77 #define REG_POS(v) (((v) >> 5) << 4)
78
79 static inline void apic_set_reg(struct kvm_lapic *apic, int reg_off, u32 val)
80 {
81 *((u32 *) (apic->regs + reg_off)) = val;
82 }
83
84 static inline int apic_test_vector(int vec, void *bitmap)
85 {
86 return test_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
87 }
88
89 bool kvm_apic_pending_eoi(struct kvm_vcpu *vcpu, int vector)
90 {
91 struct kvm_lapic *apic = vcpu->arch.apic;
92
93 return apic_test_vector(vector, apic->regs + APIC_ISR) ||
94 apic_test_vector(vector, apic->regs + APIC_IRR);
95 }
96
97 static inline void apic_set_vector(int vec, void *bitmap)
98 {
99 set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
100 }
101
102 static inline void apic_clear_vector(int vec, void *bitmap)
103 {
104 clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
105 }
106
107 static inline int __apic_test_and_set_vector(int vec, void *bitmap)
108 {
109 return __test_and_set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
110 }
111
112 static inline int __apic_test_and_clear_vector(int vec, void *bitmap)
113 {
114 return __test_and_clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
115 }
116
117 struct static_key_deferred apic_hw_disabled __read_mostly;
118 struct static_key_deferred apic_sw_disabled __read_mostly;
119
120 static inline int apic_enabled(struct kvm_lapic *apic)
121 {
122 return kvm_apic_sw_enabled(apic) && kvm_apic_hw_enabled(apic);
123 }
124
125 #define LVT_MASK \
126 (APIC_LVT_MASKED | APIC_SEND_PENDING | APIC_VECTOR_MASK)
127
128 #define LINT_MASK \
129 (LVT_MASK | APIC_MODE_MASK | APIC_INPUT_POLARITY | \
130 APIC_LVT_REMOTE_IRR | APIC_LVT_LEVEL_TRIGGER)
131
132 /* The logical map is definitely wrong if we have multiple
133 * modes at the same time. (Physical map is always right.)
134 */
135 static inline bool kvm_apic_logical_map_valid(struct kvm_apic_map *map)
136 {
137 return !(map->mode & (map->mode - 1));
138 }
139
140 static inline void
141 apic_logical_id(struct kvm_apic_map *map, u32 dest_id, u16 *cid, u16 *lid)
142 {
143 unsigned lid_bits;
144
145 BUILD_BUG_ON(KVM_APIC_MODE_XAPIC_CLUSTER != 4);
146 BUILD_BUG_ON(KVM_APIC_MODE_XAPIC_FLAT != 8);
147 BUILD_BUG_ON(KVM_APIC_MODE_X2APIC != 16);
148 lid_bits = map->mode;
149
150 *cid = dest_id >> lid_bits;
151 *lid = dest_id & ((1 << lid_bits) - 1);
152 }
153
154 static void recalculate_apic_map(struct kvm *kvm)
155 {
156 struct kvm_apic_map *new, *old = NULL;
157 struct kvm_vcpu *vcpu;
158 int i;
159
160 new = kzalloc(sizeof(struct kvm_apic_map), GFP_KERNEL);
161
162 mutex_lock(&kvm->arch.apic_map_lock);
163
164 if (!new)
165 goto out;
166
167 kvm_for_each_vcpu(i, vcpu, kvm) {
168 struct kvm_lapic *apic = vcpu->arch.apic;
169 u16 cid, lid;
170 u32 ldr, aid;
171
172 if (!kvm_apic_present(vcpu))
173 continue;
174
175 aid = kvm_apic_id(apic);
176 ldr = kvm_apic_get_reg(apic, APIC_LDR);
177
178 if (aid < ARRAY_SIZE(new->phys_map))
179 new->phys_map[aid] = apic;
180
181 if (apic_x2apic_mode(apic)) {
182 new->mode |= KVM_APIC_MODE_X2APIC;
183 } else if (ldr) {
184 ldr = GET_APIC_LOGICAL_ID(ldr);
185 if (kvm_apic_get_reg(apic, APIC_DFR) == APIC_DFR_FLAT)
186 new->mode |= KVM_APIC_MODE_XAPIC_FLAT;
187 else
188 new->mode |= KVM_APIC_MODE_XAPIC_CLUSTER;
189 }
190
191 if (!kvm_apic_logical_map_valid(new))
192 continue;
193
194 apic_logical_id(new, ldr, &cid, &lid);
195
196 if (lid && cid < ARRAY_SIZE(new->logical_map))
197 new->logical_map[cid][ffs(lid) - 1] = apic;
198 }
199 out:
200 old = rcu_dereference_protected(kvm->arch.apic_map,
201 lockdep_is_held(&kvm->arch.apic_map_lock));
202 rcu_assign_pointer(kvm->arch.apic_map, new);
203 mutex_unlock(&kvm->arch.apic_map_lock);
204
205 if (old)
206 kfree_rcu(old, rcu);
207
208 kvm_make_scan_ioapic_request(kvm);
209 }
210
211 static inline void apic_set_spiv(struct kvm_lapic *apic, u32 val)
212 {
213 bool enabled = val & APIC_SPIV_APIC_ENABLED;
214
215 apic_set_reg(apic, APIC_SPIV, val);
216
217 if (enabled != apic->sw_enabled) {
218 apic->sw_enabled = enabled;
219 if (enabled) {
220 static_key_slow_dec_deferred(&apic_sw_disabled);
221 recalculate_apic_map(apic->vcpu->kvm);
222 } else
223 static_key_slow_inc(&apic_sw_disabled.key);
224 }
225 }
226
227 static inline void kvm_apic_set_id(struct kvm_lapic *apic, u8 id)
228 {
229 apic_set_reg(apic, APIC_ID, id << 24);
230 recalculate_apic_map(apic->vcpu->kvm);
231 }
232
233 static inline void kvm_apic_set_ldr(struct kvm_lapic *apic, u32 id)
234 {
235 apic_set_reg(apic, APIC_LDR, id);
236 recalculate_apic_map(apic->vcpu->kvm);
237 }
238
239 static inline void kvm_apic_set_x2apic_id(struct kvm_lapic *apic, u8 id)
240 {
241 u32 ldr = ((id >> 4) << 16) | (1 << (id & 0xf));
242
243 apic_set_reg(apic, APIC_ID, id << 24);
244 apic_set_reg(apic, APIC_LDR, ldr);
245 recalculate_apic_map(apic->vcpu->kvm);
246 }
247
248 static inline int apic_lvt_enabled(struct kvm_lapic *apic, int lvt_type)
249 {
250 return !(kvm_apic_get_reg(apic, lvt_type) & APIC_LVT_MASKED);
251 }
252
253 static inline int apic_lvt_vector(struct kvm_lapic *apic, int lvt_type)
254 {
255 return kvm_apic_get_reg(apic, lvt_type) & APIC_VECTOR_MASK;
256 }
257
258 static inline int apic_lvtt_oneshot(struct kvm_lapic *apic)
259 {
260 return apic->lapic_timer.timer_mode == APIC_LVT_TIMER_ONESHOT;
261 }
262
263 static inline int apic_lvtt_period(struct kvm_lapic *apic)
264 {
265 return apic->lapic_timer.timer_mode == APIC_LVT_TIMER_PERIODIC;
266 }
267
268 static inline int apic_lvtt_tscdeadline(struct kvm_lapic *apic)
269 {
270 return apic->lapic_timer.timer_mode == APIC_LVT_TIMER_TSCDEADLINE;
271 }
272
273 static inline int apic_lvt_nmi_mode(u32 lvt_val)
274 {
275 return (lvt_val & (APIC_MODE_MASK | APIC_LVT_MASKED)) == APIC_DM_NMI;
276 }
277
278 void kvm_apic_set_version(struct kvm_vcpu *vcpu)
279 {
280 struct kvm_lapic *apic = vcpu->arch.apic;
281 struct kvm_cpuid_entry2 *feat;
282 u32 v = APIC_VERSION;
283
284 if (!lapic_in_kernel(vcpu))
285 return;
286
287 feat = kvm_find_cpuid_entry(apic->vcpu, 0x1, 0);
288 if (feat && (feat->ecx & (1 << (X86_FEATURE_X2APIC & 31))))
289 v |= APIC_LVR_DIRECTED_EOI;
290 apic_set_reg(apic, APIC_LVR, v);
291 }
292
293 static const unsigned int apic_lvt_mask[APIC_LVT_NUM] = {
294 LVT_MASK , /* part LVTT mask, timer mode mask added at runtime */
295 LVT_MASK | APIC_MODE_MASK, /* LVTTHMR */
296 LVT_MASK | APIC_MODE_MASK, /* LVTPC */
297 LINT_MASK, LINT_MASK, /* LVT0-1 */
298 LVT_MASK /* LVTERR */
299 };
300
301 static int find_highest_vector(void *bitmap)
302 {
303 int vec;
304 u32 *reg;
305
306 for (vec = MAX_APIC_VECTOR - APIC_VECTORS_PER_REG;
307 vec >= 0; vec -= APIC_VECTORS_PER_REG) {
308 reg = bitmap + REG_POS(vec);
309 if (*reg)
310 return fls(*reg) - 1 + vec;
311 }
312
313 return -1;
314 }
315
316 static u8 count_vectors(void *bitmap)
317 {
318 int vec;
319 u32 *reg;
320 u8 count = 0;
321
322 for (vec = 0; vec < MAX_APIC_VECTOR; vec += APIC_VECTORS_PER_REG) {
323 reg = bitmap + REG_POS(vec);
324 count += hweight32(*reg);
325 }
326
327 return count;
328 }
329
330 void __kvm_apic_update_irr(u32 *pir, void *regs)
331 {
332 u32 i, pir_val;
333
334 for (i = 0; i <= 7; i++) {
335 pir_val = xchg(&pir[i], 0);
336 if (pir_val)
337 *((u32 *)(regs + APIC_IRR + i * 0x10)) |= pir_val;
338 }
339 }
340 EXPORT_SYMBOL_GPL(__kvm_apic_update_irr);
341
342 void kvm_apic_update_irr(struct kvm_vcpu *vcpu, u32 *pir)
343 {
344 struct kvm_lapic *apic = vcpu->arch.apic;
345
346 __kvm_apic_update_irr(pir, apic->regs);
347
348 kvm_make_request(KVM_REQ_EVENT, vcpu);
349 }
350 EXPORT_SYMBOL_GPL(kvm_apic_update_irr);
351
352 static inline void apic_set_irr(int vec, struct kvm_lapic *apic)
353 {
354 apic_set_vector(vec, apic->regs + APIC_IRR);
355 /*
356 * irr_pending must be true if any interrupt is pending; set it after
357 * APIC_IRR to avoid race with apic_clear_irr
358 */
359 apic->irr_pending = true;
360 }
361
362 static inline int apic_search_irr(struct kvm_lapic *apic)
363 {
364 return find_highest_vector(apic->regs + APIC_IRR);
365 }
366
367 static inline int apic_find_highest_irr(struct kvm_lapic *apic)
368 {
369 int result;
370
371 /*
372 * Note that irr_pending is just a hint. It will be always
373 * true with virtual interrupt delivery enabled.
374 */
375 if (!apic->irr_pending)
376 return -1;
377
378 if (apic->vcpu->arch.apicv_active)
379 kvm_x86_ops->sync_pir_to_irr(apic->vcpu);
380 result = apic_search_irr(apic);
381 ASSERT(result == -1 || result >= 16);
382
383 return result;
384 }
385
386 static inline void apic_clear_irr(int vec, struct kvm_lapic *apic)
387 {
388 struct kvm_vcpu *vcpu;
389
390 vcpu = apic->vcpu;
391
392 if (unlikely(vcpu->arch.apicv_active)) {
393 /* try to update RVI */
394 apic_clear_vector(vec, apic->regs + APIC_IRR);
395 kvm_make_request(KVM_REQ_EVENT, vcpu);
396 } else {
397 apic->irr_pending = false;
398 apic_clear_vector(vec, apic->regs + APIC_IRR);
399 if (apic_search_irr(apic) != -1)
400 apic->irr_pending = true;
401 }
402 }
403
404 static inline void apic_set_isr(int vec, struct kvm_lapic *apic)
405 {
406 struct kvm_vcpu *vcpu;
407
408 if (__apic_test_and_set_vector(vec, apic->regs + APIC_ISR))
409 return;
410
411 vcpu = apic->vcpu;
412
413 /*
414 * With APIC virtualization enabled, all caching is disabled
415 * because the processor can modify ISR under the hood. Instead
416 * just set SVI.
417 */
418 if (unlikely(vcpu->arch.apicv_active))
419 kvm_x86_ops->hwapic_isr_update(vcpu->kvm, vec);
420 else {
421 ++apic->isr_count;
422 BUG_ON(apic->isr_count > MAX_APIC_VECTOR);
423 /*
424 * ISR (in service register) bit is set when injecting an interrupt.
425 * The highest vector is injected. Thus the latest bit set matches
426 * the highest bit in ISR.
427 */
428 apic->highest_isr_cache = vec;
429 }
430 }
431
432 static inline int apic_find_highest_isr(struct kvm_lapic *apic)
433 {
434 int result;
435
436 /*
437 * Note that isr_count is always 1, and highest_isr_cache
438 * is always -1, with APIC virtualization enabled.
439 */
440 if (!apic->isr_count)
441 return -1;
442 if (likely(apic->highest_isr_cache != -1))
443 return apic->highest_isr_cache;
444
445 result = find_highest_vector(apic->regs + APIC_ISR);
446 ASSERT(result == -1 || result >= 16);
447
448 return result;
449 }
450
451 static inline void apic_clear_isr(int vec, struct kvm_lapic *apic)
452 {
453 struct kvm_vcpu *vcpu;
454 if (!__apic_test_and_clear_vector(vec, apic->regs + APIC_ISR))
455 return;
456
457 vcpu = apic->vcpu;
458
459 /*
460 * We do get here for APIC virtualization enabled if the guest
461 * uses the Hyper-V APIC enlightenment. In this case we may need
462 * to trigger a new interrupt delivery by writing the SVI field;
463 * on the other hand isr_count and highest_isr_cache are unused
464 * and must be left alone.
465 */
466 if (unlikely(vcpu->arch.apicv_active))
467 kvm_x86_ops->hwapic_isr_update(vcpu->kvm,
468 apic_find_highest_isr(apic));
469 else {
470 --apic->isr_count;
471 BUG_ON(apic->isr_count < 0);
472 apic->highest_isr_cache = -1;
473 }
474 }
475
476 int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu)
477 {
478 /* This may race with setting of irr in __apic_accept_irq() and
479 * value returned may be wrong, but kvm_vcpu_kick() in __apic_accept_irq
480 * will cause vmexit immediately and the value will be recalculated
481 * on the next vmentry.
482 */
483 return apic_find_highest_irr(vcpu->arch.apic);
484 }
485
486 static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
487 int vector, int level, int trig_mode,
488 struct dest_map *dest_map);
489
490 int kvm_apic_set_irq(struct kvm_vcpu *vcpu, struct kvm_lapic_irq *irq,
491 struct dest_map *dest_map)
492 {
493 struct kvm_lapic *apic = vcpu->arch.apic;
494
495 return __apic_accept_irq(apic, irq->delivery_mode, irq->vector,
496 irq->level, irq->trig_mode, dest_map);
497 }
498
499 static int pv_eoi_put_user(struct kvm_vcpu *vcpu, u8 val)
500 {
501
502 return kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.pv_eoi.data, &val,
503 sizeof(val));
504 }
505
506 static int pv_eoi_get_user(struct kvm_vcpu *vcpu, u8 *val)
507 {
508
509 return kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.pv_eoi.data, val,
510 sizeof(*val));
511 }
512
513 static inline bool pv_eoi_enabled(struct kvm_vcpu *vcpu)
514 {
515 return vcpu->arch.pv_eoi.msr_val & KVM_MSR_ENABLED;
516 }
517
518 static bool pv_eoi_get_pending(struct kvm_vcpu *vcpu)
519 {
520 u8 val;
521 if (pv_eoi_get_user(vcpu, &val) < 0)
522 apic_debug("Can't read EOI MSR value: 0x%llx\n",
523 (unsigned long long)vcpu->arch.pv_eoi.msr_val);
524 return val & 0x1;
525 }
526
527 static void pv_eoi_set_pending(struct kvm_vcpu *vcpu)
528 {
529 if (pv_eoi_put_user(vcpu, KVM_PV_EOI_ENABLED) < 0) {
530 apic_debug("Can't set EOI MSR value: 0x%llx\n",
531 (unsigned long long)vcpu->arch.pv_eoi.msr_val);
532 return;
533 }
534 __set_bit(KVM_APIC_PV_EOI_PENDING, &vcpu->arch.apic_attention);
535 }
536
537 static void pv_eoi_clr_pending(struct kvm_vcpu *vcpu)
538 {
539 if (pv_eoi_put_user(vcpu, KVM_PV_EOI_DISABLED) < 0) {
540 apic_debug("Can't clear EOI MSR value: 0x%llx\n",
541 (unsigned long long)vcpu->arch.pv_eoi.msr_val);
542 return;
543 }
544 __clear_bit(KVM_APIC_PV_EOI_PENDING, &vcpu->arch.apic_attention);
545 }
546
547 static void apic_update_ppr(struct kvm_lapic *apic)
548 {
549 u32 tpr, isrv, ppr, old_ppr;
550 int isr;
551
552 old_ppr = kvm_apic_get_reg(apic, APIC_PROCPRI);
553 tpr = kvm_apic_get_reg(apic, APIC_TASKPRI);
554 isr = apic_find_highest_isr(apic);
555 isrv = (isr != -1) ? isr : 0;
556
557 if ((tpr & 0xf0) >= (isrv & 0xf0))
558 ppr = tpr & 0xff;
559 else
560 ppr = isrv & 0xf0;
561
562 apic_debug("vlapic %p, ppr 0x%x, isr 0x%x, isrv 0x%x",
563 apic, ppr, isr, isrv);
564
565 if (old_ppr != ppr) {
566 apic_set_reg(apic, APIC_PROCPRI, ppr);
567 if (ppr < old_ppr)
568 kvm_make_request(KVM_REQ_EVENT, apic->vcpu);
569 }
570 }
571
572 static void apic_set_tpr(struct kvm_lapic *apic, u32 tpr)
573 {
574 apic_set_reg(apic, APIC_TASKPRI, tpr);
575 apic_update_ppr(apic);
576 }
577
578 static bool kvm_apic_broadcast(struct kvm_lapic *apic, u32 mda)
579 {
580 if (apic_x2apic_mode(apic))
581 return mda == X2APIC_BROADCAST;
582
583 return GET_APIC_DEST_FIELD(mda) == APIC_BROADCAST;
584 }
585
586 static bool kvm_apic_match_physical_addr(struct kvm_lapic *apic, u32 mda)
587 {
588 if (kvm_apic_broadcast(apic, mda))
589 return true;
590
591 if (apic_x2apic_mode(apic))
592 return mda == kvm_apic_id(apic);
593
594 return mda == SET_APIC_DEST_FIELD(kvm_apic_id(apic));
595 }
596
597 static bool kvm_apic_match_logical_addr(struct kvm_lapic *apic, u32 mda)
598 {
599 u32 logical_id;
600
601 if (kvm_apic_broadcast(apic, mda))
602 return true;
603
604 logical_id = kvm_apic_get_reg(apic, APIC_LDR);
605
606 if (apic_x2apic_mode(apic))
607 return ((logical_id >> 16) == (mda >> 16))
608 && (logical_id & mda & 0xffff) != 0;
609
610 logical_id = GET_APIC_LOGICAL_ID(logical_id);
611 mda = GET_APIC_DEST_FIELD(mda);
612
613 switch (kvm_apic_get_reg(apic, APIC_DFR)) {
614 case APIC_DFR_FLAT:
615 return (logical_id & mda) != 0;
616 case APIC_DFR_CLUSTER:
617 return ((logical_id >> 4) == (mda >> 4))
618 && (logical_id & mda & 0xf) != 0;
619 default:
620 apic_debug("Bad DFR vcpu %d: %08x\n",
621 apic->vcpu->vcpu_id, kvm_apic_get_reg(apic, APIC_DFR));
622 return false;
623 }
624 }
625
626 /* KVM APIC implementation has two quirks
627 * - dest always begins at 0 while xAPIC MDA has offset 24,
628 * - IOxAPIC messages have to be delivered (directly) to x2APIC.
629 */
630 static u32 kvm_apic_mda(unsigned int dest_id, struct kvm_lapic *source,
631 struct kvm_lapic *target)
632 {
633 bool ipi = source != NULL;
634 bool x2apic_mda = apic_x2apic_mode(ipi ? source : target);
635
636 if (!ipi && dest_id == APIC_BROADCAST && x2apic_mda)
637 return X2APIC_BROADCAST;
638
639 return x2apic_mda ? dest_id : SET_APIC_DEST_FIELD(dest_id);
640 }
641
642 bool kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
643 int short_hand, unsigned int dest, int dest_mode)
644 {
645 struct kvm_lapic *target = vcpu->arch.apic;
646 u32 mda = kvm_apic_mda(dest, source, target);
647
648 apic_debug("target %p, source %p, dest 0x%x, "
649 "dest_mode 0x%x, short_hand 0x%x\n",
650 target, source, dest, dest_mode, short_hand);
651
652 ASSERT(target);
653 switch (short_hand) {
654 case APIC_DEST_NOSHORT:
655 if (dest_mode == APIC_DEST_PHYSICAL)
656 return kvm_apic_match_physical_addr(target, mda);
657 else
658 return kvm_apic_match_logical_addr(target, mda);
659 case APIC_DEST_SELF:
660 return target == source;
661 case APIC_DEST_ALLINC:
662 return true;
663 case APIC_DEST_ALLBUT:
664 return target != source;
665 default:
666 apic_debug("kvm: apic: Bad dest shorthand value %x\n",
667 short_hand);
668 return false;
669 }
670 }
671
672 int kvm_vector_to_index(u32 vector, u32 dest_vcpus,
673 const unsigned long *bitmap, u32 bitmap_size)
674 {
675 u32 mod;
676 int i, idx = -1;
677
678 mod = vector % dest_vcpus;
679
680 for (i = 0; i <= mod; i++) {
681 idx = find_next_bit(bitmap, bitmap_size, idx + 1);
682 BUG_ON(idx == bitmap_size);
683 }
684
685 return idx;
686 }
687
688 static void kvm_apic_disabled_lapic_found(struct kvm *kvm)
689 {
690 if (!kvm->arch.disabled_lapic_found) {
691 kvm->arch.disabled_lapic_found = true;
692 printk(KERN_INFO
693 "Disabled LAPIC found during irq injection\n");
694 }
695 }
696
697 bool kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct kvm_lapic *src,
698 struct kvm_lapic_irq *irq, int *r, struct dest_map *dest_map)
699 {
700 struct kvm_apic_map *map;
701 unsigned long bitmap = 1;
702 struct kvm_lapic **dst;
703 int i;
704 bool ret, x2apic_ipi;
705
706 *r = -1;
707
708 if (irq->shorthand == APIC_DEST_SELF) {
709 *r = kvm_apic_set_irq(src->vcpu, irq, dest_map);
710 return true;
711 }
712
713 if (irq->shorthand)
714 return false;
715
716 x2apic_ipi = src && apic_x2apic_mode(src);
717 if (irq->dest_id == (x2apic_ipi ? X2APIC_BROADCAST : APIC_BROADCAST))
718 return false;
719
720 ret = true;
721 rcu_read_lock();
722 map = rcu_dereference(kvm->arch.apic_map);
723
724 if (!map) {
725 ret = false;
726 goto out;
727 }
728
729 if (irq->dest_mode == APIC_DEST_PHYSICAL) {
730 if (irq->dest_id >= ARRAY_SIZE(map->phys_map))
731 goto out;
732
733 dst = &map->phys_map[irq->dest_id];
734 } else {
735 u16 cid;
736
737 if (!kvm_apic_logical_map_valid(map)) {
738 ret = false;
739 goto out;
740 }
741
742 apic_logical_id(map, irq->dest_id, &cid, (u16 *)&bitmap);
743
744 if (cid >= ARRAY_SIZE(map->logical_map))
745 goto out;
746
747 dst = map->logical_map[cid];
748
749 if (!kvm_lowest_prio_delivery(irq))
750 goto set_irq;
751
752 if (!kvm_vector_hashing_enabled()) {
753 int l = -1;
754 for_each_set_bit(i, &bitmap, 16) {
755 if (!dst[i])
756 continue;
757 if (l < 0)
758 l = i;
759 else if (kvm_apic_compare_prio(dst[i]->vcpu,
760 dst[l]->vcpu) < 0)
761 l = i;
762 }
763 bitmap = (l >= 0) ? 1 << l : 0;
764 } else {
765 int idx;
766 unsigned int dest_vcpus;
767
768 dest_vcpus = hweight16(bitmap);
769 if (dest_vcpus == 0)
770 goto out;
771
772 idx = kvm_vector_to_index(irq->vector,
773 dest_vcpus, &bitmap, 16);
774
775 if (!dst[idx]) {
776 kvm_apic_disabled_lapic_found(kvm);
777 goto out;
778 }
779
780 bitmap = (idx >= 0) ? 1 << idx : 0;
781 }
782 }
783
784 set_irq:
785 for_each_set_bit(i, &bitmap, 16) {
786 if (!dst[i])
787 continue;
788 if (*r < 0)
789 *r = 0;
790 *r += kvm_apic_set_irq(dst[i]->vcpu, irq, dest_map);
791 }
792 out:
793 rcu_read_unlock();
794 return ret;
795 }
796
797 /*
798 * This routine tries to handler interrupts in posted mode, here is how
799 * it deals with different cases:
800 * - For single-destination interrupts, handle it in posted mode
801 * - Else if vector hashing is enabled and it is a lowest-priority
802 * interrupt, handle it in posted mode and use the following mechanism
803 * to find the destinaiton vCPU.
804 * 1. For lowest-priority interrupts, store all the possible
805 * destination vCPUs in an array.
806 * 2. Use "guest vector % max number of destination vCPUs" to find
807 * the right destination vCPU in the array for the lowest-priority
808 * interrupt.
809 * - Otherwise, use remapped mode to inject the interrupt.
810 */
811 bool kvm_intr_is_single_vcpu_fast(struct kvm *kvm, struct kvm_lapic_irq *irq,
812 struct kvm_vcpu **dest_vcpu)
813 {
814 struct kvm_apic_map *map;
815 bool ret = false;
816 struct kvm_lapic *dst = NULL;
817
818 if (irq->shorthand)
819 return false;
820
821 rcu_read_lock();
822 map = rcu_dereference(kvm->arch.apic_map);
823
824 if (!map)
825 goto out;
826
827 if (irq->dest_mode == APIC_DEST_PHYSICAL) {
828 if (irq->dest_id == 0xFF)
829 goto out;
830
831 if (irq->dest_id >= ARRAY_SIZE(map->phys_map))
832 goto out;
833
834 dst = map->phys_map[irq->dest_id];
835 if (dst && kvm_apic_present(dst->vcpu))
836 *dest_vcpu = dst->vcpu;
837 else
838 goto out;
839 } else {
840 u16 cid;
841 unsigned long bitmap = 1;
842 int i, r = 0;
843
844 if (!kvm_apic_logical_map_valid(map))
845 goto out;
846
847 apic_logical_id(map, irq->dest_id, &cid, (u16 *)&bitmap);
848
849 if (cid >= ARRAY_SIZE(map->logical_map))
850 goto out;
851
852 if (kvm_vector_hashing_enabled() &&
853 kvm_lowest_prio_delivery(irq)) {
854 int idx;
855 unsigned int dest_vcpus;
856
857 dest_vcpus = hweight16(bitmap);
858 if (dest_vcpus == 0)
859 goto out;
860
861 idx = kvm_vector_to_index(irq->vector, dest_vcpus,
862 &bitmap, 16);
863
864 dst = map->logical_map[cid][idx];
865 if (!dst) {
866 kvm_apic_disabled_lapic_found(kvm);
867 goto out;
868 }
869
870 *dest_vcpu = dst->vcpu;
871 } else {
872 for_each_set_bit(i, &bitmap, 16) {
873 dst = map->logical_map[cid][i];
874 if (++r == 2)
875 goto out;
876 }
877
878 if (dst && kvm_apic_present(dst->vcpu))
879 *dest_vcpu = dst->vcpu;
880 else
881 goto out;
882 }
883 }
884
885 ret = true;
886 out:
887 rcu_read_unlock();
888 return ret;
889 }
890
891 /*
892 * Add a pending IRQ into lapic.
893 * Return 1 if successfully added and 0 if discarded.
894 */
895 static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
896 int vector, int level, int trig_mode,
897 struct dest_map *dest_map)
898 {
899 int result = 0;
900 struct kvm_vcpu *vcpu = apic->vcpu;
901
902 trace_kvm_apic_accept_irq(vcpu->vcpu_id, delivery_mode,
903 trig_mode, vector);
904 switch (delivery_mode) {
905 case APIC_DM_LOWEST:
906 vcpu->arch.apic_arb_prio++;
907 case APIC_DM_FIXED:
908 if (unlikely(trig_mode && !level))
909 break;
910
911 /* FIXME add logic for vcpu on reset */
912 if (unlikely(!apic_enabled(apic)))
913 break;
914
915 result = 1;
916
917 if (dest_map) {
918 __set_bit(vcpu->vcpu_id, dest_map->map);
919 dest_map->vectors[vcpu->vcpu_id] = vector;
920 }
921
922 if (apic_test_vector(vector, apic->regs + APIC_TMR) != !!trig_mode) {
923 if (trig_mode)
924 apic_set_vector(vector, apic->regs + APIC_TMR);
925 else
926 apic_clear_vector(vector, apic->regs + APIC_TMR);
927 }
928
929 if (vcpu->arch.apicv_active)
930 kvm_x86_ops->deliver_posted_interrupt(vcpu, vector);
931 else {
932 apic_set_irr(vector, apic);
933
934 kvm_make_request(KVM_REQ_EVENT, vcpu);
935 kvm_vcpu_kick(vcpu);
936 }
937 break;
938
939 case APIC_DM_REMRD:
940 result = 1;
941 vcpu->arch.pv.pv_unhalted = 1;
942 kvm_make_request(KVM_REQ_EVENT, vcpu);
943 kvm_vcpu_kick(vcpu);
944 break;
945
946 case APIC_DM_SMI:
947 result = 1;
948 kvm_make_request(KVM_REQ_SMI, vcpu);
949 kvm_vcpu_kick(vcpu);
950 break;
951
952 case APIC_DM_NMI:
953 result = 1;
954 kvm_inject_nmi(vcpu);
955 kvm_vcpu_kick(vcpu);
956 break;
957
958 case APIC_DM_INIT:
959 if (!trig_mode || level) {
960 result = 1;
961 /* assumes that there are only KVM_APIC_INIT/SIPI */
962 apic->pending_events = (1UL << KVM_APIC_INIT);
963 /* make sure pending_events is visible before sending
964 * the request */
965 smp_wmb();
966 kvm_make_request(KVM_REQ_EVENT, vcpu);
967 kvm_vcpu_kick(vcpu);
968 } else {
969 apic_debug("Ignoring de-assert INIT to vcpu %d\n",
970 vcpu->vcpu_id);
971 }
972 break;
973
974 case APIC_DM_STARTUP:
975 apic_debug("SIPI to vcpu %d vector 0x%02x\n",
976 vcpu->vcpu_id, vector);
977 result = 1;
978 apic->sipi_vector = vector;
979 /* make sure sipi_vector is visible for the receiver */
980 smp_wmb();
981 set_bit(KVM_APIC_SIPI, &apic->pending_events);
982 kvm_make_request(KVM_REQ_EVENT, vcpu);
983 kvm_vcpu_kick(vcpu);
984 break;
985
986 case APIC_DM_EXTINT:
987 /*
988 * Should only be called by kvm_apic_local_deliver() with LVT0,
989 * before NMI watchdog was enabled. Already handled by
990 * kvm_apic_accept_pic_intr().
991 */
992 break;
993
994 default:
995 printk(KERN_ERR "TODO: unsupported delivery mode %x\n",
996 delivery_mode);
997 break;
998 }
999 return result;
1000 }
1001
1002 int kvm_apic_compare_prio(struct kvm_vcpu *vcpu1, struct kvm_vcpu *vcpu2)
1003 {
1004 return vcpu1->arch.apic_arb_prio - vcpu2->arch.apic_arb_prio;
1005 }
1006
1007 static bool kvm_ioapic_handles_vector(struct kvm_lapic *apic, int vector)
1008 {
1009 return test_bit(vector, apic->vcpu->arch.ioapic_handled_vectors);
1010 }
1011
1012 static void kvm_ioapic_send_eoi(struct kvm_lapic *apic, int vector)
1013 {
1014 int trigger_mode;
1015
1016 /* Eoi the ioapic only if the ioapic doesn't own the vector. */
1017 if (!kvm_ioapic_handles_vector(apic, vector))
1018 return;
1019
1020 /* Request a KVM exit to inform the userspace IOAPIC. */
1021 if (irqchip_split(apic->vcpu->kvm)) {
1022 apic->vcpu->arch.pending_ioapic_eoi = vector;
1023 kvm_make_request(KVM_REQ_IOAPIC_EOI_EXIT, apic->vcpu);
1024 return;
1025 }
1026
1027 if (apic_test_vector(vector, apic->regs + APIC_TMR))
1028 trigger_mode = IOAPIC_LEVEL_TRIG;
1029 else
1030 trigger_mode = IOAPIC_EDGE_TRIG;
1031
1032 kvm_ioapic_update_eoi(apic->vcpu, vector, trigger_mode);
1033 }
1034
1035 static int apic_set_eoi(struct kvm_lapic *apic)
1036 {
1037 int vector = apic_find_highest_isr(apic);
1038
1039 trace_kvm_eoi(apic, vector);
1040
1041 /*
1042 * Not every write EOI will has corresponding ISR,
1043 * one example is when Kernel check timer on setup_IO_APIC
1044 */
1045 if (vector == -1)
1046 return vector;
1047
1048 apic_clear_isr(vector, apic);
1049 apic_update_ppr(apic);
1050
1051 if (test_bit(vector, vcpu_to_synic(apic->vcpu)->vec_bitmap))
1052 kvm_hv_synic_send_eoi(apic->vcpu, vector);
1053
1054 kvm_ioapic_send_eoi(apic, vector);
1055 kvm_make_request(KVM_REQ_EVENT, apic->vcpu);
1056 return vector;
1057 }
1058
1059 /*
1060 * this interface assumes a trap-like exit, which has already finished
1061 * desired side effect including vISR and vPPR update.
1062 */
1063 void kvm_apic_set_eoi_accelerated(struct kvm_vcpu *vcpu, int vector)
1064 {
1065 struct kvm_lapic *apic = vcpu->arch.apic;
1066
1067 trace_kvm_eoi(apic, vector);
1068
1069 kvm_ioapic_send_eoi(apic, vector);
1070 kvm_make_request(KVM_REQ_EVENT, apic->vcpu);
1071 }
1072 EXPORT_SYMBOL_GPL(kvm_apic_set_eoi_accelerated);
1073
1074 static void apic_send_ipi(struct kvm_lapic *apic)
1075 {
1076 u32 icr_low = kvm_apic_get_reg(apic, APIC_ICR);
1077 u32 icr_high = kvm_apic_get_reg(apic, APIC_ICR2);
1078 struct kvm_lapic_irq irq;
1079
1080 irq.vector = icr_low & APIC_VECTOR_MASK;
1081 irq.delivery_mode = icr_low & APIC_MODE_MASK;
1082 irq.dest_mode = icr_low & APIC_DEST_MASK;
1083 irq.level = (icr_low & APIC_INT_ASSERT) != 0;
1084 irq.trig_mode = icr_low & APIC_INT_LEVELTRIG;
1085 irq.shorthand = icr_low & APIC_SHORT_MASK;
1086 irq.msi_redir_hint = false;
1087 if (apic_x2apic_mode(apic))
1088 irq.dest_id = icr_high;
1089 else
1090 irq.dest_id = GET_APIC_DEST_FIELD(icr_high);
1091
1092 trace_kvm_apic_ipi(icr_low, irq.dest_id);
1093
1094 apic_debug("icr_high 0x%x, icr_low 0x%x, "
1095 "short_hand 0x%x, dest 0x%x, trig_mode 0x%x, level 0x%x, "
1096 "dest_mode 0x%x, delivery_mode 0x%x, vector 0x%x, "
1097 "msi_redir_hint 0x%x\n",
1098 icr_high, icr_low, irq.shorthand, irq.dest_id,
1099 irq.trig_mode, irq.level, irq.dest_mode, irq.delivery_mode,
1100 irq.vector, irq.msi_redir_hint);
1101
1102 kvm_irq_delivery_to_apic(apic->vcpu->kvm, apic, &irq, NULL);
1103 }
1104
1105 static u32 apic_get_tmcct(struct kvm_lapic *apic)
1106 {
1107 ktime_t remaining;
1108 s64 ns;
1109 u32 tmcct;
1110
1111 ASSERT(apic != NULL);
1112
1113 /* if initial count is 0, current count should also be 0 */
1114 if (kvm_apic_get_reg(apic, APIC_TMICT) == 0 ||
1115 apic->lapic_timer.period == 0)
1116 return 0;
1117
1118 remaining = hrtimer_get_remaining(&apic->lapic_timer.timer);
1119 if (ktime_to_ns(remaining) < 0)
1120 remaining = ktime_set(0, 0);
1121
1122 ns = mod_64(ktime_to_ns(remaining), apic->lapic_timer.period);
1123 tmcct = div64_u64(ns,
1124 (APIC_BUS_CYCLE_NS * apic->divide_count));
1125
1126 return tmcct;
1127 }
1128
1129 static void __report_tpr_access(struct kvm_lapic *apic, bool write)
1130 {
1131 struct kvm_vcpu *vcpu = apic->vcpu;
1132 struct kvm_run *run = vcpu->run;
1133
1134 kvm_make_request(KVM_REQ_REPORT_TPR_ACCESS, vcpu);
1135 run->tpr_access.rip = kvm_rip_read(vcpu);
1136 run->tpr_access.is_write = write;
1137 }
1138
1139 static inline void report_tpr_access(struct kvm_lapic *apic, bool write)
1140 {
1141 if (apic->vcpu->arch.tpr_access_reporting)
1142 __report_tpr_access(apic, write);
1143 }
1144
1145 static u32 __apic_read(struct kvm_lapic *apic, unsigned int offset)
1146 {
1147 u32 val = 0;
1148
1149 if (offset >= LAPIC_MMIO_LENGTH)
1150 return 0;
1151
1152 switch (offset) {
1153 case APIC_ID:
1154 if (apic_x2apic_mode(apic))
1155 val = kvm_apic_id(apic);
1156 else
1157 val = kvm_apic_id(apic) << 24;
1158 break;
1159 case APIC_ARBPRI:
1160 apic_debug("Access APIC ARBPRI register which is for P6\n");
1161 break;
1162
1163 case APIC_TMCCT: /* Timer CCR */
1164 if (apic_lvtt_tscdeadline(apic))
1165 return 0;
1166
1167 val = apic_get_tmcct(apic);
1168 break;
1169 case APIC_PROCPRI:
1170 apic_update_ppr(apic);
1171 val = kvm_apic_get_reg(apic, offset);
1172 break;
1173 case APIC_TASKPRI:
1174 report_tpr_access(apic, false);
1175 /* fall thru */
1176 default:
1177 val = kvm_apic_get_reg(apic, offset);
1178 break;
1179 }
1180
1181 return val;
1182 }
1183
1184 static inline struct kvm_lapic *to_lapic(struct kvm_io_device *dev)
1185 {
1186 return container_of(dev, struct kvm_lapic, dev);
1187 }
1188
1189 static int apic_reg_read(struct kvm_lapic *apic, u32 offset, int len,
1190 void *data)
1191 {
1192 unsigned char alignment = offset & 0xf;
1193 u32 result;
1194 /* this bitmask has a bit cleared for each reserved register */
1195 static const u64 rmask = 0x43ff01ffffffe70cULL;
1196
1197 if ((alignment + len) > 4) {
1198 apic_debug("KVM_APIC_READ: alignment error %x %d\n",
1199 offset, len);
1200 return 1;
1201 }
1202
1203 if (offset > 0x3f0 || !(rmask & (1ULL << (offset >> 4)))) {
1204 apic_debug("KVM_APIC_READ: read reserved register %x\n",
1205 offset);
1206 return 1;
1207 }
1208
1209 result = __apic_read(apic, offset & ~0xf);
1210
1211 trace_kvm_apic_read(offset, result);
1212
1213 switch (len) {
1214 case 1:
1215 case 2:
1216 case 4:
1217 memcpy(data, (char *)&result + alignment, len);
1218 break;
1219 default:
1220 printk(KERN_ERR "Local APIC read with len = %x, "
1221 "should be 1,2, or 4 instead\n", len);
1222 break;
1223 }
1224 return 0;
1225 }
1226
1227 static int apic_mmio_in_range(struct kvm_lapic *apic, gpa_t addr)
1228 {
1229 return kvm_apic_hw_enabled(apic) &&
1230 addr >= apic->base_address &&
1231 addr < apic->base_address + LAPIC_MMIO_LENGTH;
1232 }
1233
1234 static int apic_mmio_read(struct kvm_vcpu *vcpu, struct kvm_io_device *this,
1235 gpa_t address, int len, void *data)
1236 {
1237 struct kvm_lapic *apic = to_lapic(this);
1238 u32 offset = address - apic->base_address;
1239
1240 if (!apic_mmio_in_range(apic, address))
1241 return -EOPNOTSUPP;
1242
1243 apic_reg_read(apic, offset, len, data);
1244
1245 return 0;
1246 }
1247
1248 static void update_divide_count(struct kvm_lapic *apic)
1249 {
1250 u32 tmp1, tmp2, tdcr;
1251
1252 tdcr = kvm_apic_get_reg(apic, APIC_TDCR);
1253 tmp1 = tdcr & 0xf;
1254 tmp2 = ((tmp1 & 0x3) | ((tmp1 & 0x8) >> 1)) + 1;
1255 apic->divide_count = 0x1 << (tmp2 & 0x7);
1256
1257 apic_debug("timer divide count is 0x%x\n",
1258 apic->divide_count);
1259 }
1260
1261 static void apic_update_lvtt(struct kvm_lapic *apic)
1262 {
1263 u32 timer_mode = kvm_apic_get_reg(apic, APIC_LVTT) &
1264 apic->lapic_timer.timer_mode_mask;
1265
1266 if (apic->lapic_timer.timer_mode != timer_mode) {
1267 apic->lapic_timer.timer_mode = timer_mode;
1268 hrtimer_cancel(&apic->lapic_timer.timer);
1269 }
1270 }
1271
1272 static void apic_timer_expired(struct kvm_lapic *apic)
1273 {
1274 struct kvm_vcpu *vcpu = apic->vcpu;
1275 struct swait_queue_head *q = &vcpu->wq;
1276 struct kvm_timer *ktimer = &apic->lapic_timer;
1277
1278 if (atomic_read(&apic->lapic_timer.pending))
1279 return;
1280
1281 atomic_inc(&apic->lapic_timer.pending);
1282 kvm_set_pending_timer(vcpu);
1283
1284 if (swait_active(q))
1285 swake_up(q);
1286
1287 if (apic_lvtt_tscdeadline(apic))
1288 ktimer->expired_tscdeadline = ktimer->tscdeadline;
1289 }
1290
1291 /*
1292 * On APICv, this test will cause a busy wait
1293 * during a higher-priority task.
1294 */
1295
1296 static bool lapic_timer_int_injected(struct kvm_vcpu *vcpu)
1297 {
1298 struct kvm_lapic *apic = vcpu->arch.apic;
1299 u32 reg = kvm_apic_get_reg(apic, APIC_LVTT);
1300
1301 if (kvm_apic_hw_enabled(apic)) {
1302 int vec = reg & APIC_VECTOR_MASK;
1303 void *bitmap = apic->regs + APIC_ISR;
1304
1305 if (vcpu->arch.apicv_active)
1306 bitmap = apic->regs + APIC_IRR;
1307
1308 if (apic_test_vector(vec, bitmap))
1309 return true;
1310 }
1311 return false;
1312 }
1313
1314 void wait_lapic_expire(struct kvm_vcpu *vcpu)
1315 {
1316 struct kvm_lapic *apic = vcpu->arch.apic;
1317 u64 guest_tsc, tsc_deadline;
1318
1319 if (!lapic_in_kernel(vcpu))
1320 return;
1321
1322 if (apic->lapic_timer.expired_tscdeadline == 0)
1323 return;
1324
1325 if (!lapic_timer_int_injected(vcpu))
1326 return;
1327
1328 tsc_deadline = apic->lapic_timer.expired_tscdeadline;
1329 apic->lapic_timer.expired_tscdeadline = 0;
1330 guest_tsc = kvm_read_l1_tsc(vcpu, rdtsc());
1331 trace_kvm_wait_lapic_expire(vcpu->vcpu_id, guest_tsc - tsc_deadline);
1332
1333 /* __delay is delay_tsc whenever the hardware has TSC, thus always. */
1334 if (guest_tsc < tsc_deadline)
1335 __delay(tsc_deadline - guest_tsc);
1336 }
1337
1338 static void start_apic_timer(struct kvm_lapic *apic)
1339 {
1340 ktime_t now;
1341
1342 atomic_set(&apic->lapic_timer.pending, 0);
1343
1344 if (apic_lvtt_period(apic) || apic_lvtt_oneshot(apic)) {
1345 /* lapic timer in oneshot or periodic mode */
1346 now = apic->lapic_timer.timer.base->get_time();
1347 apic->lapic_timer.period = (u64)kvm_apic_get_reg(apic, APIC_TMICT)
1348 * APIC_BUS_CYCLE_NS * apic->divide_count;
1349
1350 if (!apic->lapic_timer.period)
1351 return;
1352 /*
1353 * Do not allow the guest to program periodic timers with small
1354 * interval, since the hrtimers are not throttled by the host
1355 * scheduler.
1356 */
1357 if (apic_lvtt_period(apic)) {
1358 s64 min_period = min_timer_period_us * 1000LL;
1359
1360 if (apic->lapic_timer.period < min_period) {
1361 pr_info_ratelimited(
1362 "kvm: vcpu %i: requested %lld ns "
1363 "lapic timer period limited to %lld ns\n",
1364 apic->vcpu->vcpu_id,
1365 apic->lapic_timer.period, min_period);
1366 apic->lapic_timer.period = min_period;
1367 }
1368 }
1369
1370 hrtimer_start(&apic->lapic_timer.timer,
1371 ktime_add_ns(now, apic->lapic_timer.period),
1372 HRTIMER_MODE_ABS_PINNED);
1373
1374 apic_debug("%s: bus cycle is %" PRId64 "ns, now 0x%016"
1375 PRIx64 ", "
1376 "timer initial count 0x%x, period %lldns, "
1377 "expire @ 0x%016" PRIx64 ".\n", __func__,
1378 APIC_BUS_CYCLE_NS, ktime_to_ns(now),
1379 kvm_apic_get_reg(apic, APIC_TMICT),
1380 apic->lapic_timer.period,
1381 ktime_to_ns(ktime_add_ns(now,
1382 apic->lapic_timer.period)));
1383 } else if (apic_lvtt_tscdeadline(apic)) {
1384 /* lapic timer in tsc deadline mode */
1385 u64 guest_tsc, tscdeadline = apic->lapic_timer.tscdeadline;
1386 u64 ns = 0;
1387 ktime_t expire;
1388 struct kvm_vcpu *vcpu = apic->vcpu;
1389 unsigned long this_tsc_khz = vcpu->arch.virtual_tsc_khz;
1390 unsigned long flags;
1391
1392 if (unlikely(!tscdeadline || !this_tsc_khz))
1393 return;
1394
1395 local_irq_save(flags);
1396
1397 now = apic->lapic_timer.timer.base->get_time();
1398 guest_tsc = kvm_read_l1_tsc(vcpu, rdtsc());
1399 if (likely(tscdeadline > guest_tsc)) {
1400 ns = (tscdeadline - guest_tsc) * 1000000ULL;
1401 do_div(ns, this_tsc_khz);
1402 expire = ktime_add_ns(now, ns);
1403 expire = ktime_sub_ns(expire, lapic_timer_advance_ns);
1404 hrtimer_start(&apic->lapic_timer.timer,
1405 expire, HRTIMER_MODE_ABS_PINNED);
1406 } else
1407 apic_timer_expired(apic);
1408
1409 local_irq_restore(flags);
1410 }
1411 }
1412
1413 static void apic_manage_nmi_watchdog(struct kvm_lapic *apic, u32 lvt0_val)
1414 {
1415 bool lvt0_in_nmi_mode = apic_lvt_nmi_mode(lvt0_val);
1416
1417 if (apic->lvt0_in_nmi_mode != lvt0_in_nmi_mode) {
1418 apic->lvt0_in_nmi_mode = lvt0_in_nmi_mode;
1419 if (lvt0_in_nmi_mode) {
1420 apic_debug("Receive NMI setting on APIC_LVT0 "
1421 "for cpu %d\n", apic->vcpu->vcpu_id);
1422 atomic_inc(&apic->vcpu->kvm->arch.vapics_in_nmi_mode);
1423 } else
1424 atomic_dec(&apic->vcpu->kvm->arch.vapics_in_nmi_mode);
1425 }
1426 }
1427
1428 static int apic_reg_write(struct kvm_lapic *apic, u32 reg, u32 val)
1429 {
1430 int ret = 0;
1431
1432 trace_kvm_apic_write(reg, val);
1433
1434 switch (reg) {
1435 case APIC_ID: /* Local APIC ID */
1436 if (!apic_x2apic_mode(apic))
1437 kvm_apic_set_id(apic, val >> 24);
1438 else
1439 ret = 1;
1440 break;
1441
1442 case APIC_TASKPRI:
1443 report_tpr_access(apic, true);
1444 apic_set_tpr(apic, val & 0xff);
1445 break;
1446
1447 case APIC_EOI:
1448 apic_set_eoi(apic);
1449 break;
1450
1451 case APIC_LDR:
1452 if (!apic_x2apic_mode(apic))
1453 kvm_apic_set_ldr(apic, val & APIC_LDR_MASK);
1454 else
1455 ret = 1;
1456 break;
1457
1458 case APIC_DFR:
1459 if (!apic_x2apic_mode(apic)) {
1460 apic_set_reg(apic, APIC_DFR, val | 0x0FFFFFFF);
1461 recalculate_apic_map(apic->vcpu->kvm);
1462 } else
1463 ret = 1;
1464 break;
1465
1466 case APIC_SPIV: {
1467 u32 mask = 0x3ff;
1468 if (kvm_apic_get_reg(apic, APIC_LVR) & APIC_LVR_DIRECTED_EOI)
1469 mask |= APIC_SPIV_DIRECTED_EOI;
1470 apic_set_spiv(apic, val & mask);
1471 if (!(val & APIC_SPIV_APIC_ENABLED)) {
1472 int i;
1473 u32 lvt_val;
1474
1475 for (i = 0; i < APIC_LVT_NUM; i++) {
1476 lvt_val = kvm_apic_get_reg(apic,
1477 APIC_LVTT + 0x10 * i);
1478 apic_set_reg(apic, APIC_LVTT + 0x10 * i,
1479 lvt_val | APIC_LVT_MASKED);
1480 }
1481 apic_update_lvtt(apic);
1482 atomic_set(&apic->lapic_timer.pending, 0);
1483
1484 }
1485 break;
1486 }
1487 case APIC_ICR:
1488 /* No delay here, so we always clear the pending bit */
1489 apic_set_reg(apic, APIC_ICR, val & ~(1 << 12));
1490 apic_send_ipi(apic);
1491 break;
1492
1493 case APIC_ICR2:
1494 if (!apic_x2apic_mode(apic))
1495 val &= 0xff000000;
1496 apic_set_reg(apic, APIC_ICR2, val);
1497 break;
1498
1499 case APIC_LVT0:
1500 apic_manage_nmi_watchdog(apic, val);
1501 case APIC_LVTTHMR:
1502 case APIC_LVTPC:
1503 case APIC_LVT1:
1504 case APIC_LVTERR:
1505 /* TODO: Check vector */
1506 if (!kvm_apic_sw_enabled(apic))
1507 val |= APIC_LVT_MASKED;
1508
1509 val &= apic_lvt_mask[(reg - APIC_LVTT) >> 4];
1510 apic_set_reg(apic, reg, val);
1511
1512 break;
1513
1514 case APIC_LVTT:
1515 if (!kvm_apic_sw_enabled(apic))
1516 val |= APIC_LVT_MASKED;
1517 val &= (apic_lvt_mask[0] | apic->lapic_timer.timer_mode_mask);
1518 apic_set_reg(apic, APIC_LVTT, val);
1519 apic_update_lvtt(apic);
1520 break;
1521
1522 case APIC_TMICT:
1523 if (apic_lvtt_tscdeadline(apic))
1524 break;
1525
1526 hrtimer_cancel(&apic->lapic_timer.timer);
1527 apic_set_reg(apic, APIC_TMICT, val);
1528 start_apic_timer(apic);
1529 break;
1530
1531 case APIC_TDCR:
1532 if (val & 4)
1533 apic_debug("KVM_WRITE:TDCR %x\n", val);
1534 apic_set_reg(apic, APIC_TDCR, val);
1535 update_divide_count(apic);
1536 break;
1537
1538 case APIC_ESR:
1539 if (apic_x2apic_mode(apic) && val != 0) {
1540 apic_debug("KVM_WRITE:ESR not zero %x\n", val);
1541 ret = 1;
1542 }
1543 break;
1544
1545 case APIC_SELF_IPI:
1546 if (apic_x2apic_mode(apic)) {
1547 apic_reg_write(apic, APIC_ICR, 0x40000 | (val & 0xff));
1548 } else
1549 ret = 1;
1550 break;
1551 default:
1552 ret = 1;
1553 break;
1554 }
1555 if (ret)
1556 apic_debug("Local APIC Write to read-only register %x\n", reg);
1557 return ret;
1558 }
1559
1560 static int apic_mmio_write(struct kvm_vcpu *vcpu, struct kvm_io_device *this,
1561 gpa_t address, int len, const void *data)
1562 {
1563 struct kvm_lapic *apic = to_lapic(this);
1564 unsigned int offset = address - apic->base_address;
1565 u32 val;
1566
1567 if (!apic_mmio_in_range(apic, address))
1568 return -EOPNOTSUPP;
1569
1570 /*
1571 * APIC register must be aligned on 128-bits boundary.
1572 * 32/64/128 bits registers must be accessed thru 32 bits.
1573 * Refer SDM 8.4.1
1574 */
1575 if (len != 4 || (offset & 0xf)) {
1576 /* Don't shout loud, $infamous_os would cause only noise. */
1577 apic_debug("apic write: bad size=%d %lx\n", len, (long)address);
1578 return 0;
1579 }
1580
1581 val = *(u32*)data;
1582
1583 /* too common printing */
1584 if (offset != APIC_EOI)
1585 apic_debug("%s: offset 0x%x with length 0x%x, and value is "
1586 "0x%x\n", __func__, offset, len, val);
1587
1588 apic_reg_write(apic, offset & 0xff0, val);
1589
1590 return 0;
1591 }
1592
1593 void kvm_lapic_set_eoi(struct kvm_vcpu *vcpu)
1594 {
1595 apic_reg_write(vcpu->arch.apic, APIC_EOI, 0);
1596 }
1597 EXPORT_SYMBOL_GPL(kvm_lapic_set_eoi);
1598
1599 /* emulate APIC access in a trap manner */
1600 void kvm_apic_write_nodecode(struct kvm_vcpu *vcpu, u32 offset)
1601 {
1602 u32 val = 0;
1603
1604 /* hw has done the conditional check and inst decode */
1605 offset &= 0xff0;
1606
1607 apic_reg_read(vcpu->arch.apic, offset, 4, &val);
1608
1609 /* TODO: optimize to just emulate side effect w/o one more write */
1610 apic_reg_write(vcpu->arch.apic, offset, val);
1611 }
1612 EXPORT_SYMBOL_GPL(kvm_apic_write_nodecode);
1613
1614 void kvm_free_lapic(struct kvm_vcpu *vcpu)
1615 {
1616 struct kvm_lapic *apic = vcpu->arch.apic;
1617
1618 if (!vcpu->arch.apic)
1619 return;
1620
1621 hrtimer_cancel(&apic->lapic_timer.timer);
1622
1623 if (!(vcpu->arch.apic_base & MSR_IA32_APICBASE_ENABLE))
1624 static_key_slow_dec_deferred(&apic_hw_disabled);
1625
1626 if (!apic->sw_enabled)
1627 static_key_slow_dec_deferred(&apic_sw_disabled);
1628
1629 if (apic->regs)
1630 free_page((unsigned long)apic->regs);
1631
1632 kfree(apic);
1633 }
1634
1635 /*
1636 *----------------------------------------------------------------------
1637 * LAPIC interface
1638 *----------------------------------------------------------------------
1639 */
1640
1641 u64 kvm_get_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu)
1642 {
1643 struct kvm_lapic *apic = vcpu->arch.apic;
1644
1645 if (!lapic_in_kernel(vcpu) || apic_lvtt_oneshot(apic) ||
1646 apic_lvtt_period(apic))
1647 return 0;
1648
1649 return apic->lapic_timer.tscdeadline;
1650 }
1651
1652 void kvm_set_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu, u64 data)
1653 {
1654 struct kvm_lapic *apic = vcpu->arch.apic;
1655
1656 if (!lapic_in_kernel(vcpu) || apic_lvtt_oneshot(apic) ||
1657 apic_lvtt_period(apic))
1658 return;
1659
1660 hrtimer_cancel(&apic->lapic_timer.timer);
1661 apic->lapic_timer.tscdeadline = data;
1662 start_apic_timer(apic);
1663 }
1664
1665 void kvm_lapic_set_tpr(struct kvm_vcpu *vcpu, unsigned long cr8)
1666 {
1667 struct kvm_lapic *apic = vcpu->arch.apic;
1668
1669 apic_set_tpr(apic, ((cr8 & 0x0f) << 4)
1670 | (kvm_apic_get_reg(apic, APIC_TASKPRI) & 4));
1671 }
1672
1673 u64 kvm_lapic_get_cr8(struct kvm_vcpu *vcpu)
1674 {
1675 u64 tpr;
1676
1677 tpr = (u64) kvm_apic_get_reg(vcpu->arch.apic, APIC_TASKPRI);
1678
1679 return (tpr & 0xf0) >> 4;
1680 }
1681
1682 void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value)
1683 {
1684 u64 old_value = vcpu->arch.apic_base;
1685 struct kvm_lapic *apic = vcpu->arch.apic;
1686
1687 if (!apic) {
1688 value |= MSR_IA32_APICBASE_BSP;
1689 vcpu->arch.apic_base = value;
1690 return;
1691 }
1692
1693 vcpu->arch.apic_base = value;
1694
1695 /* update jump label if enable bit changes */
1696 if ((old_value ^ value) & MSR_IA32_APICBASE_ENABLE) {
1697 if (value & MSR_IA32_APICBASE_ENABLE)
1698 static_key_slow_dec_deferred(&apic_hw_disabled);
1699 else
1700 static_key_slow_inc(&apic_hw_disabled.key);
1701 recalculate_apic_map(vcpu->kvm);
1702 }
1703
1704 if ((old_value ^ value) & X2APIC_ENABLE) {
1705 if (value & X2APIC_ENABLE) {
1706 kvm_apic_set_x2apic_id(apic, vcpu->vcpu_id);
1707 kvm_x86_ops->set_virtual_x2apic_mode(vcpu, true);
1708 } else
1709 kvm_x86_ops->set_virtual_x2apic_mode(vcpu, false);
1710 }
1711
1712 apic->base_address = apic->vcpu->arch.apic_base &
1713 MSR_IA32_APICBASE_BASE;
1714
1715 if ((value & MSR_IA32_APICBASE_ENABLE) &&
1716 apic->base_address != APIC_DEFAULT_PHYS_BASE)
1717 pr_warn_once("APIC base relocation is unsupported by KVM");
1718
1719 /* with FSB delivery interrupt, we can restart APIC functionality */
1720 apic_debug("apic base msr is 0x%016" PRIx64 ", and base address is "
1721 "0x%lx.\n", apic->vcpu->arch.apic_base, apic->base_address);
1722
1723 }
1724
1725 void kvm_lapic_reset(struct kvm_vcpu *vcpu, bool init_event)
1726 {
1727 struct kvm_lapic *apic;
1728 int i;
1729
1730 apic_debug("%s\n", __func__);
1731
1732 ASSERT(vcpu);
1733 apic = vcpu->arch.apic;
1734 ASSERT(apic != NULL);
1735
1736 /* Stop the timer in case it's a reset to an active apic */
1737 hrtimer_cancel(&apic->lapic_timer.timer);
1738
1739 if (!init_event)
1740 kvm_apic_set_id(apic, vcpu->vcpu_id);
1741 kvm_apic_set_version(apic->vcpu);
1742
1743 for (i = 0; i < APIC_LVT_NUM; i++)
1744 apic_set_reg(apic, APIC_LVTT + 0x10 * i, APIC_LVT_MASKED);
1745 apic_update_lvtt(apic);
1746 if (kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_LINT0_REENABLED))
1747 apic_set_reg(apic, APIC_LVT0,
1748 SET_APIC_DELIVERY_MODE(0, APIC_MODE_EXTINT));
1749 apic_manage_nmi_watchdog(apic, kvm_apic_get_reg(apic, APIC_LVT0));
1750
1751 apic_set_reg(apic, APIC_DFR, 0xffffffffU);
1752 apic_set_spiv(apic, 0xff);
1753 apic_set_reg(apic, APIC_TASKPRI, 0);
1754 if (!apic_x2apic_mode(apic))
1755 kvm_apic_set_ldr(apic, 0);
1756 apic_set_reg(apic, APIC_ESR, 0);
1757 apic_set_reg(apic, APIC_ICR, 0);
1758 apic_set_reg(apic, APIC_ICR2, 0);
1759 apic_set_reg(apic, APIC_TDCR, 0);
1760 apic_set_reg(apic, APIC_TMICT, 0);
1761 for (i = 0; i < 8; i++) {
1762 apic_set_reg(apic, APIC_IRR + 0x10 * i, 0);
1763 apic_set_reg(apic, APIC_ISR + 0x10 * i, 0);
1764 apic_set_reg(apic, APIC_TMR + 0x10 * i, 0);
1765 }
1766 apic->irr_pending = vcpu->arch.apicv_active;
1767 apic->isr_count = vcpu->arch.apicv_active ? 1 : 0;
1768 apic->highest_isr_cache = -1;
1769 update_divide_count(apic);
1770 atomic_set(&apic->lapic_timer.pending, 0);
1771 if (kvm_vcpu_is_bsp(vcpu))
1772 kvm_lapic_set_base(vcpu,
1773 vcpu->arch.apic_base | MSR_IA32_APICBASE_BSP);
1774 vcpu->arch.pv_eoi.msr_val = 0;
1775 apic_update_ppr(apic);
1776
1777 vcpu->arch.apic_arb_prio = 0;
1778 vcpu->arch.apic_attention = 0;
1779
1780 apic_debug("%s: vcpu=%p, id=%d, base_msr="
1781 "0x%016" PRIx64 ", base_address=0x%0lx.\n", __func__,
1782 vcpu, kvm_apic_id(apic),
1783 vcpu->arch.apic_base, apic->base_address);
1784 }
1785
1786 /*
1787 *----------------------------------------------------------------------
1788 * timer interface
1789 *----------------------------------------------------------------------
1790 */
1791
1792 static bool lapic_is_periodic(struct kvm_lapic *apic)
1793 {
1794 return apic_lvtt_period(apic);
1795 }
1796
1797 int apic_has_pending_timer(struct kvm_vcpu *vcpu)
1798 {
1799 struct kvm_lapic *apic = vcpu->arch.apic;
1800
1801 if (apic_enabled(apic) && apic_lvt_enabled(apic, APIC_LVTT))
1802 return atomic_read(&apic->lapic_timer.pending);
1803
1804 return 0;
1805 }
1806
1807 int kvm_apic_local_deliver(struct kvm_lapic *apic, int lvt_type)
1808 {
1809 u32 reg = kvm_apic_get_reg(apic, lvt_type);
1810 int vector, mode, trig_mode;
1811
1812 if (kvm_apic_hw_enabled(apic) && !(reg & APIC_LVT_MASKED)) {
1813 vector = reg & APIC_VECTOR_MASK;
1814 mode = reg & APIC_MODE_MASK;
1815 trig_mode = reg & APIC_LVT_LEVEL_TRIGGER;
1816 return __apic_accept_irq(apic, mode, vector, 1, trig_mode,
1817 NULL);
1818 }
1819 return 0;
1820 }
1821
1822 void kvm_apic_nmi_wd_deliver(struct kvm_vcpu *vcpu)
1823 {
1824 struct kvm_lapic *apic = vcpu->arch.apic;
1825
1826 if (apic)
1827 kvm_apic_local_deliver(apic, APIC_LVT0);
1828 }
1829
1830 static const struct kvm_io_device_ops apic_mmio_ops = {
1831 .read = apic_mmio_read,
1832 .write = apic_mmio_write,
1833 };
1834
1835 static enum hrtimer_restart apic_timer_fn(struct hrtimer *data)
1836 {
1837 struct kvm_timer *ktimer = container_of(data, struct kvm_timer, timer);
1838 struct kvm_lapic *apic = container_of(ktimer, struct kvm_lapic, lapic_timer);
1839
1840 apic_timer_expired(apic);
1841
1842 if (lapic_is_periodic(apic)) {
1843 hrtimer_add_expires_ns(&ktimer->timer, ktimer->period);
1844 return HRTIMER_RESTART;
1845 } else
1846 return HRTIMER_NORESTART;
1847 }
1848
1849 int kvm_create_lapic(struct kvm_vcpu *vcpu)
1850 {
1851 struct kvm_lapic *apic;
1852
1853 ASSERT(vcpu != NULL);
1854 apic_debug("apic_init %d\n", vcpu->vcpu_id);
1855
1856 apic = kzalloc(sizeof(*apic), GFP_KERNEL);
1857 if (!apic)
1858 goto nomem;
1859
1860 vcpu->arch.apic = apic;
1861
1862 apic->regs = (void *)get_zeroed_page(GFP_KERNEL);
1863 if (!apic->regs) {
1864 printk(KERN_ERR "malloc apic regs error for vcpu %x\n",
1865 vcpu->vcpu_id);
1866 goto nomem_free_apic;
1867 }
1868 apic->vcpu = vcpu;
1869
1870 hrtimer_init(&apic->lapic_timer.timer, CLOCK_MONOTONIC,
1871 HRTIMER_MODE_ABS_PINNED);
1872 apic->lapic_timer.timer.function = apic_timer_fn;
1873
1874 /*
1875 * APIC is created enabled. This will prevent kvm_lapic_set_base from
1876 * thinking that APIC satet has changed.
1877 */
1878 vcpu->arch.apic_base = MSR_IA32_APICBASE_ENABLE;
1879 kvm_lapic_set_base(vcpu,
1880 APIC_DEFAULT_PHYS_BASE | MSR_IA32_APICBASE_ENABLE);
1881
1882 static_key_slow_inc(&apic_sw_disabled.key); /* sw disabled at reset */
1883 kvm_lapic_reset(vcpu, false);
1884 kvm_iodevice_init(&apic->dev, &apic_mmio_ops);
1885
1886 return 0;
1887 nomem_free_apic:
1888 kfree(apic);
1889 nomem:
1890 return -ENOMEM;
1891 }
1892
1893 int kvm_apic_has_interrupt(struct kvm_vcpu *vcpu)
1894 {
1895 struct kvm_lapic *apic = vcpu->arch.apic;
1896 int highest_irr;
1897
1898 if (!apic_enabled(apic))
1899 return -1;
1900
1901 apic_update_ppr(apic);
1902 highest_irr = apic_find_highest_irr(apic);
1903 if ((highest_irr == -1) ||
1904 ((highest_irr & 0xF0) <= kvm_apic_get_reg(apic, APIC_PROCPRI)))
1905 return -1;
1906 return highest_irr;
1907 }
1908
1909 int kvm_apic_accept_pic_intr(struct kvm_vcpu *vcpu)
1910 {
1911 u32 lvt0 = kvm_apic_get_reg(vcpu->arch.apic, APIC_LVT0);
1912 int r = 0;
1913
1914 if (!kvm_apic_hw_enabled(vcpu->arch.apic))
1915 r = 1;
1916 if ((lvt0 & APIC_LVT_MASKED) == 0 &&
1917 GET_APIC_DELIVERY_MODE(lvt0) == APIC_MODE_EXTINT)
1918 r = 1;
1919 return r;
1920 }
1921
1922 void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu)
1923 {
1924 struct kvm_lapic *apic = vcpu->arch.apic;
1925
1926 if (atomic_read(&apic->lapic_timer.pending) > 0) {
1927 kvm_apic_local_deliver(apic, APIC_LVTT);
1928 if (apic_lvtt_tscdeadline(apic))
1929 apic->lapic_timer.tscdeadline = 0;
1930 atomic_set(&apic->lapic_timer.pending, 0);
1931 }
1932 }
1933
1934 int kvm_get_apic_interrupt(struct kvm_vcpu *vcpu)
1935 {
1936 int vector = kvm_apic_has_interrupt(vcpu);
1937 struct kvm_lapic *apic = vcpu->arch.apic;
1938
1939 if (vector == -1)
1940 return -1;
1941
1942 /*
1943 * We get here even with APIC virtualization enabled, if doing
1944 * nested virtualization and L1 runs with the "acknowledge interrupt
1945 * on exit" mode. Then we cannot inject the interrupt via RVI,
1946 * because the process would deliver it through the IDT.
1947 */
1948
1949 apic_set_isr(vector, apic);
1950 apic_update_ppr(apic);
1951 apic_clear_irr(vector, apic);
1952
1953 if (test_bit(vector, vcpu_to_synic(vcpu)->auto_eoi_bitmap)) {
1954 apic_clear_isr(vector, apic);
1955 apic_update_ppr(apic);
1956 }
1957
1958 return vector;
1959 }
1960
1961 void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu,
1962 struct kvm_lapic_state *s)
1963 {
1964 struct kvm_lapic *apic = vcpu->arch.apic;
1965
1966 kvm_lapic_set_base(vcpu, vcpu->arch.apic_base);
1967 /* set SPIV separately to get count of SW disabled APICs right */
1968 apic_set_spiv(apic, *((u32 *)(s->regs + APIC_SPIV)));
1969 memcpy(vcpu->arch.apic->regs, s->regs, sizeof *s);
1970 /* call kvm_apic_set_id() to put apic into apic_map */
1971 kvm_apic_set_id(apic, kvm_apic_id(apic));
1972 kvm_apic_set_version(vcpu);
1973
1974 apic_update_ppr(apic);
1975 hrtimer_cancel(&apic->lapic_timer.timer);
1976 apic_update_lvtt(apic);
1977 apic_manage_nmi_watchdog(apic, kvm_apic_get_reg(apic, APIC_LVT0));
1978 update_divide_count(apic);
1979 start_apic_timer(apic);
1980 apic->irr_pending = true;
1981 apic->isr_count = vcpu->arch.apicv_active ?
1982 1 : count_vectors(apic->regs + APIC_ISR);
1983 apic->highest_isr_cache = -1;
1984 if (vcpu->arch.apicv_active) {
1985 kvm_x86_ops->hwapic_irr_update(vcpu,
1986 apic_find_highest_irr(apic));
1987 kvm_x86_ops->hwapic_isr_update(vcpu->kvm,
1988 apic_find_highest_isr(apic));
1989 }
1990 kvm_make_request(KVM_REQ_EVENT, vcpu);
1991 if (ioapic_in_kernel(vcpu->kvm))
1992 kvm_rtc_eoi_tracking_restore_one(vcpu);
1993
1994 vcpu->arch.apic_arb_prio = 0;
1995 }
1996
1997 void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu)
1998 {
1999 struct hrtimer *timer;
2000
2001 if (!lapic_in_kernel(vcpu))
2002 return;
2003
2004 timer = &vcpu->arch.apic->lapic_timer.timer;
2005 if (hrtimer_cancel(timer))
2006 hrtimer_start_expires(timer, HRTIMER_MODE_ABS_PINNED);
2007 }
2008
2009 /*
2010 * apic_sync_pv_eoi_from_guest - called on vmexit or cancel interrupt
2011 *
2012 * Detect whether guest triggered PV EOI since the
2013 * last entry. If yes, set EOI on guests's behalf.
2014 * Clear PV EOI in guest memory in any case.
2015 */
2016 static void apic_sync_pv_eoi_from_guest(struct kvm_vcpu *vcpu,
2017 struct kvm_lapic *apic)
2018 {
2019 bool pending;
2020 int vector;
2021 /*
2022 * PV EOI state is derived from KVM_APIC_PV_EOI_PENDING in host
2023 * and KVM_PV_EOI_ENABLED in guest memory as follows:
2024 *
2025 * KVM_APIC_PV_EOI_PENDING is unset:
2026 * -> host disabled PV EOI.
2027 * KVM_APIC_PV_EOI_PENDING is set, KVM_PV_EOI_ENABLED is set:
2028 * -> host enabled PV EOI, guest did not execute EOI yet.
2029 * KVM_APIC_PV_EOI_PENDING is set, KVM_PV_EOI_ENABLED is unset:
2030 * -> host enabled PV EOI, guest executed EOI.
2031 */
2032 BUG_ON(!pv_eoi_enabled(vcpu));
2033 pending = pv_eoi_get_pending(vcpu);
2034 /*
2035 * Clear pending bit in any case: it will be set again on vmentry.
2036 * While this might not be ideal from performance point of view,
2037 * this makes sure pv eoi is only enabled when we know it's safe.
2038 */
2039 pv_eoi_clr_pending(vcpu);
2040 if (pending)
2041 return;
2042 vector = apic_set_eoi(apic);
2043 trace_kvm_pv_eoi(apic, vector);
2044 }
2045
2046 void kvm_lapic_sync_from_vapic(struct kvm_vcpu *vcpu)
2047 {
2048 u32 data;
2049
2050 if (test_bit(KVM_APIC_PV_EOI_PENDING, &vcpu->arch.apic_attention))
2051 apic_sync_pv_eoi_from_guest(vcpu, vcpu->arch.apic);
2052
2053 if (!test_bit(KVM_APIC_CHECK_VAPIC, &vcpu->arch.apic_attention))
2054 return;
2055
2056 if (kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.apic->vapic_cache, &data,
2057 sizeof(u32)))
2058 return;
2059
2060 apic_set_tpr(vcpu->arch.apic, data & 0xff);
2061 }
2062
2063 /*
2064 * apic_sync_pv_eoi_to_guest - called before vmentry
2065 *
2066 * Detect whether it's safe to enable PV EOI and
2067 * if yes do so.
2068 */
2069 static void apic_sync_pv_eoi_to_guest(struct kvm_vcpu *vcpu,
2070 struct kvm_lapic *apic)
2071 {
2072 if (!pv_eoi_enabled(vcpu) ||
2073 /* IRR set or many bits in ISR: could be nested. */
2074 apic->irr_pending ||
2075 /* Cache not set: could be safe but we don't bother. */
2076 apic->highest_isr_cache == -1 ||
2077 /* Need EOI to update ioapic. */
2078 kvm_ioapic_handles_vector(apic, apic->highest_isr_cache)) {
2079 /*
2080 * PV EOI was disabled by apic_sync_pv_eoi_from_guest
2081 * so we need not do anything here.
2082 */
2083 return;
2084 }
2085
2086 pv_eoi_set_pending(apic->vcpu);
2087 }
2088
2089 void kvm_lapic_sync_to_vapic(struct kvm_vcpu *vcpu)
2090 {
2091 u32 data, tpr;
2092 int max_irr, max_isr;
2093 struct kvm_lapic *apic = vcpu->arch.apic;
2094
2095 apic_sync_pv_eoi_to_guest(vcpu, apic);
2096
2097 if (!test_bit(KVM_APIC_CHECK_VAPIC, &vcpu->arch.apic_attention))
2098 return;
2099
2100 tpr = kvm_apic_get_reg(apic, APIC_TASKPRI) & 0xff;
2101 max_irr = apic_find_highest_irr(apic);
2102 if (max_irr < 0)
2103 max_irr = 0;
2104 max_isr = apic_find_highest_isr(apic);
2105 if (max_isr < 0)
2106 max_isr = 0;
2107 data = (tpr & 0xff) | ((max_isr & 0xf0) << 8) | (max_irr << 24);
2108
2109 kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.apic->vapic_cache, &data,
2110 sizeof(u32));
2111 }
2112
2113 int kvm_lapic_set_vapic_addr(struct kvm_vcpu *vcpu, gpa_t vapic_addr)
2114 {
2115 if (vapic_addr) {
2116 if (kvm_gfn_to_hva_cache_init(vcpu->kvm,
2117 &vcpu->arch.apic->vapic_cache,
2118 vapic_addr, sizeof(u32)))
2119 return -EINVAL;
2120 __set_bit(KVM_APIC_CHECK_VAPIC, &vcpu->arch.apic_attention);
2121 } else {
2122 __clear_bit(KVM_APIC_CHECK_VAPIC, &vcpu->arch.apic_attention);
2123 }
2124
2125 vcpu->arch.apic->vapic_addr = vapic_addr;
2126 return 0;
2127 }
2128
2129 int kvm_x2apic_msr_write(struct kvm_vcpu *vcpu, u32 msr, u64 data)
2130 {
2131 struct kvm_lapic *apic = vcpu->arch.apic;
2132 u32 reg = (msr - APIC_BASE_MSR) << 4;
2133
2134 if (!lapic_in_kernel(vcpu) || !apic_x2apic_mode(apic))
2135 return 1;
2136
2137 if (reg == APIC_ICR2)
2138 return 1;
2139
2140 /* if this is ICR write vector before command */
2141 if (reg == APIC_ICR)
2142 apic_reg_write(apic, APIC_ICR2, (u32)(data >> 32));
2143 return apic_reg_write(apic, reg, (u32)data);
2144 }
2145
2146 int kvm_x2apic_msr_read(struct kvm_vcpu *vcpu, u32 msr, u64 *data)
2147 {
2148 struct kvm_lapic *apic = vcpu->arch.apic;
2149 u32 reg = (msr - APIC_BASE_MSR) << 4, low, high = 0;
2150
2151 if (!lapic_in_kernel(vcpu) || !apic_x2apic_mode(apic))
2152 return 1;
2153
2154 if (reg == APIC_DFR || reg == APIC_ICR2) {
2155 apic_debug("KVM_APIC_READ: read x2apic reserved register %x\n",
2156 reg);
2157 return 1;
2158 }
2159
2160 if (apic_reg_read(apic, reg, 4, &low))
2161 return 1;
2162 if (reg == APIC_ICR)
2163 apic_reg_read(apic, APIC_ICR2, 4, &high);
2164
2165 *data = (((u64)high) << 32) | low;
2166
2167 return 0;
2168 }
2169
2170 int kvm_hv_vapic_msr_write(struct kvm_vcpu *vcpu, u32 reg, u64 data)
2171 {
2172 struct kvm_lapic *apic = vcpu->arch.apic;
2173
2174 if (!lapic_in_kernel(vcpu))
2175 return 1;
2176
2177 /* if this is ICR write vector before command */
2178 if (reg == APIC_ICR)
2179 apic_reg_write(apic, APIC_ICR2, (u32)(data >> 32));
2180 return apic_reg_write(apic, reg, (u32)data);
2181 }
2182
2183 int kvm_hv_vapic_msr_read(struct kvm_vcpu *vcpu, u32 reg, u64 *data)
2184 {
2185 struct kvm_lapic *apic = vcpu->arch.apic;
2186 u32 low, high = 0;
2187
2188 if (!lapic_in_kernel(vcpu))
2189 return 1;
2190
2191 if (apic_reg_read(apic, reg, 4, &low))
2192 return 1;
2193 if (reg == APIC_ICR)
2194 apic_reg_read(apic, APIC_ICR2, 4, &high);
2195
2196 *data = (((u64)high) << 32) | low;
2197
2198 return 0;
2199 }
2200
2201 int kvm_lapic_enable_pv_eoi(struct kvm_vcpu *vcpu, u64 data)
2202 {
2203 u64 addr = data & ~KVM_MSR_ENABLED;
2204 if (!IS_ALIGNED(addr, 4))
2205 return 1;
2206
2207 vcpu->arch.pv_eoi.msr_val = data;
2208 if (!pv_eoi_enabled(vcpu))
2209 return 0;
2210 return kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.pv_eoi.data,
2211 addr, sizeof(u8));
2212 }
2213
2214 void kvm_apic_accept_events(struct kvm_vcpu *vcpu)
2215 {
2216 struct kvm_lapic *apic = vcpu->arch.apic;
2217 u8 sipi_vector;
2218 unsigned long pe;
2219
2220 if (!lapic_in_kernel(vcpu) || !apic->pending_events)
2221 return;
2222
2223 /*
2224 * INITs are latched while in SMM. Because an SMM CPU cannot
2225 * be in KVM_MP_STATE_INIT_RECEIVED state, just eat SIPIs
2226 * and delay processing of INIT until the next RSM.
2227 */
2228 if (is_smm(vcpu)) {
2229 WARN_ON_ONCE(vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED);
2230 if (test_bit(KVM_APIC_SIPI, &apic->pending_events))
2231 clear_bit(KVM_APIC_SIPI, &apic->pending_events);
2232 return;
2233 }
2234
2235 pe = xchg(&apic->pending_events, 0);
2236 if (test_bit(KVM_APIC_INIT, &pe)) {
2237 kvm_lapic_reset(vcpu, true);
2238 kvm_vcpu_reset(vcpu, true);
2239 if (kvm_vcpu_is_bsp(apic->vcpu))
2240 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
2241 else
2242 vcpu->arch.mp_state = KVM_MP_STATE_INIT_RECEIVED;
2243 }
2244 if (test_bit(KVM_APIC_SIPI, &pe) &&
2245 vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) {
2246 /* evaluate pending_events before reading the vector */
2247 smp_rmb();
2248 sipi_vector = apic->sipi_vector;
2249 apic_debug("vcpu %d received sipi with vector # %x\n",
2250 vcpu->vcpu_id, sipi_vector);
2251 kvm_vcpu_deliver_sipi_vector(vcpu, sipi_vector);
2252 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
2253 }
2254 }
2255
2256 void kvm_lapic_init(void)
2257 {
2258 /* do not patch jump label more than once per second */
2259 jump_label_rate_limit(&apic_hw_disabled, HZ);
2260 jump_label_rate_limit(&apic_sw_disabled, HZ);
2261 }
Linux kernel - Deliverables
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