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MIPS: KVM: Relative branch to common exit handler
[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 /* 14 is the version for Xeon and Pentium 8.4.8*/
63 #define APIC_VERSION (0x14UL | ((KVM_APIC_LVT_NUM - 1) << 16))
64 #define LAPIC_MMIO_LENGTH (1 << 12)
65 /* followed define is not in apicdef.h */
66 #define APIC_SHORT_MASK 0xc0000
67 #define APIC_DEST_NOSHORT 0x0
68 #define APIC_DEST_MASK 0x800
69 #define MAX_APIC_VECTOR 256
70 #define APIC_VECTORS_PER_REG 32
71
72 #define APIC_BROADCAST 0xFF
73 #define X2APIC_BROADCAST 0xFFFFFFFFul
74
75 static inline int apic_test_vector(int vec, void *bitmap)
76 {
77 return test_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
78 }
79
80 bool kvm_apic_pending_eoi(struct kvm_vcpu *vcpu, int vector)
81 {
82 struct kvm_lapic *apic = vcpu->arch.apic;
83
84 return apic_test_vector(vector, apic->regs + APIC_ISR) ||
85 apic_test_vector(vector, apic->regs + APIC_IRR);
86 }
87
88 static inline void apic_clear_vector(int vec, void *bitmap)
89 {
90 clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
91 }
92
93 static inline int __apic_test_and_set_vector(int vec, void *bitmap)
94 {
95 return __test_and_set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
96 }
97
98 static inline int __apic_test_and_clear_vector(int vec, void *bitmap)
99 {
100 return __test_and_clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
101 }
102
103 struct static_key_deferred apic_hw_disabled __read_mostly;
104 struct static_key_deferred apic_sw_disabled __read_mostly;
105
106 static inline int apic_enabled(struct kvm_lapic *apic)
107 {
108 return kvm_apic_sw_enabled(apic) && kvm_apic_hw_enabled(apic);
109 }
110
111 #define LVT_MASK \
112 (APIC_LVT_MASKED | APIC_SEND_PENDING | APIC_VECTOR_MASK)
113
114 #define LINT_MASK \
115 (LVT_MASK | APIC_MODE_MASK | APIC_INPUT_POLARITY | \
116 APIC_LVT_REMOTE_IRR | APIC_LVT_LEVEL_TRIGGER)
117
118 /* The logical map is definitely wrong if we have multiple
119 * modes at the same time. (Physical map is always right.)
120 */
121 static inline bool kvm_apic_logical_map_valid(struct kvm_apic_map *map)
122 {
123 return !(map->mode & (map->mode - 1));
124 }
125
126 static inline void
127 apic_logical_id(struct kvm_apic_map *map, u32 dest_id, u16 *cid, u16 *lid)
128 {
129 unsigned lid_bits;
130
131 BUILD_BUG_ON(KVM_APIC_MODE_XAPIC_CLUSTER != 4);
132 BUILD_BUG_ON(KVM_APIC_MODE_XAPIC_FLAT != 8);
133 BUILD_BUG_ON(KVM_APIC_MODE_X2APIC != 16);
134 lid_bits = map->mode;
135
136 *cid = dest_id >> lid_bits;
137 *lid = dest_id & ((1 << lid_bits) - 1);
138 }
139
140 static void recalculate_apic_map(struct kvm *kvm)
141 {
142 struct kvm_apic_map *new, *old = NULL;
143 struct kvm_vcpu *vcpu;
144 int i;
145
146 new = kzalloc(sizeof(struct kvm_apic_map), GFP_KERNEL);
147
148 mutex_lock(&kvm->arch.apic_map_lock);
149
150 if (!new)
151 goto out;
152
153 kvm_for_each_vcpu(i, vcpu, kvm) {
154 struct kvm_lapic *apic = vcpu->arch.apic;
155 u16 cid, lid;
156 u32 ldr, aid;
157
158 if (!kvm_apic_present(vcpu))
159 continue;
160
161 aid = kvm_apic_id(apic);
162 ldr = kvm_lapic_get_reg(apic, APIC_LDR);
163
164 if (aid < ARRAY_SIZE(new->phys_map))
165 new->phys_map[aid] = apic;
166
167 if (apic_x2apic_mode(apic)) {
168 new->mode |= KVM_APIC_MODE_X2APIC;
169 } else if (ldr) {
170 ldr = GET_APIC_LOGICAL_ID(ldr);
171 if (kvm_lapic_get_reg(apic, APIC_DFR) == APIC_DFR_FLAT)
172 new->mode |= KVM_APIC_MODE_XAPIC_FLAT;
173 else
174 new->mode |= KVM_APIC_MODE_XAPIC_CLUSTER;
175 }
176
177 if (!kvm_apic_logical_map_valid(new))
178 continue;
179
180 apic_logical_id(new, ldr, &cid, &lid);
181
182 if (lid && cid < ARRAY_SIZE(new->logical_map))
183 new->logical_map[cid][ffs(lid) - 1] = apic;
184 }
185 out:
186 old = rcu_dereference_protected(kvm->arch.apic_map,
187 lockdep_is_held(&kvm->arch.apic_map_lock));
188 rcu_assign_pointer(kvm->arch.apic_map, new);
189 mutex_unlock(&kvm->arch.apic_map_lock);
190
191 if (old)
192 kfree_rcu(old, rcu);
193
194 kvm_make_scan_ioapic_request(kvm);
195 }
196
197 static inline void apic_set_spiv(struct kvm_lapic *apic, u32 val)
198 {
199 bool enabled = val & APIC_SPIV_APIC_ENABLED;
200
201 kvm_lapic_set_reg(apic, APIC_SPIV, val);
202
203 if (enabled != apic->sw_enabled) {
204 apic->sw_enabled = enabled;
205 if (enabled) {
206 static_key_slow_dec_deferred(&apic_sw_disabled);
207 recalculate_apic_map(apic->vcpu->kvm);
208 } else
209 static_key_slow_inc(&apic_sw_disabled.key);
210 }
211 }
212
213 static inline void kvm_apic_set_id(struct kvm_lapic *apic, u8 id)
214 {
215 kvm_lapic_set_reg(apic, APIC_ID, id << 24);
216 recalculate_apic_map(apic->vcpu->kvm);
217 }
218
219 static inline void kvm_apic_set_ldr(struct kvm_lapic *apic, u32 id)
220 {
221 kvm_lapic_set_reg(apic, APIC_LDR, id);
222 recalculate_apic_map(apic->vcpu->kvm);
223 }
224
225 static inline void kvm_apic_set_x2apic_id(struct kvm_lapic *apic, u8 id)
226 {
227 u32 ldr = ((id >> 4) << 16) | (1 << (id & 0xf));
228
229 kvm_lapic_set_reg(apic, APIC_ID, id << 24);
230 kvm_lapic_set_reg(apic, APIC_LDR, ldr);
231 recalculate_apic_map(apic->vcpu->kvm);
232 }
233
234 static inline int apic_lvt_enabled(struct kvm_lapic *apic, int lvt_type)
235 {
236 return !(kvm_lapic_get_reg(apic, lvt_type) & APIC_LVT_MASKED);
237 }
238
239 static inline int apic_lvt_vector(struct kvm_lapic *apic, int lvt_type)
240 {
241 return kvm_lapic_get_reg(apic, lvt_type) & APIC_VECTOR_MASK;
242 }
243
244 static inline int apic_lvtt_oneshot(struct kvm_lapic *apic)
245 {
246 return apic->lapic_timer.timer_mode == APIC_LVT_TIMER_ONESHOT;
247 }
248
249 static inline int apic_lvtt_period(struct kvm_lapic *apic)
250 {
251 return apic->lapic_timer.timer_mode == APIC_LVT_TIMER_PERIODIC;
252 }
253
254 static inline int apic_lvtt_tscdeadline(struct kvm_lapic *apic)
255 {
256 return apic->lapic_timer.timer_mode == APIC_LVT_TIMER_TSCDEADLINE;
257 }
258
259 static inline int apic_lvt_nmi_mode(u32 lvt_val)
260 {
261 return (lvt_val & (APIC_MODE_MASK | APIC_LVT_MASKED)) == APIC_DM_NMI;
262 }
263
264 void kvm_apic_set_version(struct kvm_vcpu *vcpu)
265 {
266 struct kvm_lapic *apic = vcpu->arch.apic;
267 struct kvm_cpuid_entry2 *feat;
268 u32 v = APIC_VERSION;
269
270 if (!lapic_in_kernel(vcpu))
271 return;
272
273 feat = kvm_find_cpuid_entry(apic->vcpu, 0x1, 0);
274 if (feat && (feat->ecx & (1 << (X86_FEATURE_X2APIC & 31))))
275 v |= APIC_LVR_DIRECTED_EOI;
276 kvm_lapic_set_reg(apic, APIC_LVR, v);
277 }
278
279 static const unsigned int apic_lvt_mask[KVM_APIC_LVT_NUM] = {
280 LVT_MASK , /* part LVTT mask, timer mode mask added at runtime */
281 LVT_MASK | APIC_MODE_MASK, /* LVTTHMR */
282 LVT_MASK | APIC_MODE_MASK, /* LVTPC */
283 LINT_MASK, LINT_MASK, /* LVT0-1 */
284 LVT_MASK /* LVTERR */
285 };
286
287 static int find_highest_vector(void *bitmap)
288 {
289 int vec;
290 u32 *reg;
291
292 for (vec = MAX_APIC_VECTOR - APIC_VECTORS_PER_REG;
293 vec >= 0; vec -= APIC_VECTORS_PER_REG) {
294 reg = bitmap + REG_POS(vec);
295 if (*reg)
296 return fls(*reg) - 1 + vec;
297 }
298
299 return -1;
300 }
301
302 static u8 count_vectors(void *bitmap)
303 {
304 int vec;
305 u32 *reg;
306 u8 count = 0;
307
308 for (vec = 0; vec < MAX_APIC_VECTOR; vec += APIC_VECTORS_PER_REG) {
309 reg = bitmap + REG_POS(vec);
310 count += hweight32(*reg);
311 }
312
313 return count;
314 }
315
316 void __kvm_apic_update_irr(u32 *pir, void *regs)
317 {
318 u32 i, pir_val;
319
320 for (i = 0; i <= 7; i++) {
321 pir_val = xchg(&pir[i], 0);
322 if (pir_val)
323 *((u32 *)(regs + APIC_IRR + i * 0x10)) |= pir_val;
324 }
325 }
326 EXPORT_SYMBOL_GPL(__kvm_apic_update_irr);
327
328 void kvm_apic_update_irr(struct kvm_vcpu *vcpu, u32 *pir)
329 {
330 struct kvm_lapic *apic = vcpu->arch.apic;
331
332 __kvm_apic_update_irr(pir, apic->regs);
333
334 kvm_make_request(KVM_REQ_EVENT, vcpu);
335 }
336 EXPORT_SYMBOL_GPL(kvm_apic_update_irr);
337
338 static inline int apic_search_irr(struct kvm_lapic *apic)
339 {
340 return find_highest_vector(apic->regs + APIC_IRR);
341 }
342
343 static inline int apic_find_highest_irr(struct kvm_lapic *apic)
344 {
345 int result;
346
347 /*
348 * Note that irr_pending is just a hint. It will be always
349 * true with virtual interrupt delivery enabled.
350 */
351 if (!apic->irr_pending)
352 return -1;
353
354 if (apic->vcpu->arch.apicv_active)
355 kvm_x86_ops->sync_pir_to_irr(apic->vcpu);
356 result = apic_search_irr(apic);
357 ASSERT(result == -1 || result >= 16);
358
359 return result;
360 }
361
362 static inline void apic_clear_irr(int vec, struct kvm_lapic *apic)
363 {
364 struct kvm_vcpu *vcpu;
365
366 vcpu = apic->vcpu;
367
368 if (unlikely(vcpu->arch.apicv_active)) {
369 /* try to update RVI */
370 apic_clear_vector(vec, apic->regs + APIC_IRR);
371 kvm_make_request(KVM_REQ_EVENT, vcpu);
372 } else {
373 apic->irr_pending = false;
374 apic_clear_vector(vec, apic->regs + APIC_IRR);
375 if (apic_search_irr(apic) != -1)
376 apic->irr_pending = true;
377 }
378 }
379
380 static inline void apic_set_isr(int vec, struct kvm_lapic *apic)
381 {
382 struct kvm_vcpu *vcpu;
383
384 if (__apic_test_and_set_vector(vec, apic->regs + APIC_ISR))
385 return;
386
387 vcpu = apic->vcpu;
388
389 /*
390 * With APIC virtualization enabled, all caching is disabled
391 * because the processor can modify ISR under the hood. Instead
392 * just set SVI.
393 */
394 if (unlikely(vcpu->arch.apicv_active))
395 kvm_x86_ops->hwapic_isr_update(vcpu, vec);
396 else {
397 ++apic->isr_count;
398 BUG_ON(apic->isr_count > MAX_APIC_VECTOR);
399 /*
400 * ISR (in service register) bit is set when injecting an interrupt.
401 * The highest vector is injected. Thus the latest bit set matches
402 * the highest bit in ISR.
403 */
404 apic->highest_isr_cache = vec;
405 }
406 }
407
408 static inline int apic_find_highest_isr(struct kvm_lapic *apic)
409 {
410 int result;
411
412 /*
413 * Note that isr_count is always 1, and highest_isr_cache
414 * is always -1, with APIC virtualization enabled.
415 */
416 if (!apic->isr_count)
417 return -1;
418 if (likely(apic->highest_isr_cache != -1))
419 return apic->highest_isr_cache;
420
421 result = find_highest_vector(apic->regs + APIC_ISR);
422 ASSERT(result == -1 || result >= 16);
423
424 return result;
425 }
426
427 static inline void apic_clear_isr(int vec, struct kvm_lapic *apic)
428 {
429 struct kvm_vcpu *vcpu;
430 if (!__apic_test_and_clear_vector(vec, apic->regs + APIC_ISR))
431 return;
432
433 vcpu = apic->vcpu;
434
435 /*
436 * We do get here for APIC virtualization enabled if the guest
437 * uses the Hyper-V APIC enlightenment. In this case we may need
438 * to trigger a new interrupt delivery by writing the SVI field;
439 * on the other hand isr_count and highest_isr_cache are unused
440 * and must be left alone.
441 */
442 if (unlikely(vcpu->arch.apicv_active))
443 kvm_x86_ops->hwapic_isr_update(vcpu,
444 apic_find_highest_isr(apic));
445 else {
446 --apic->isr_count;
447 BUG_ON(apic->isr_count < 0);
448 apic->highest_isr_cache = -1;
449 }
450 }
451
452 int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu)
453 {
454 /* This may race with setting of irr in __apic_accept_irq() and
455 * value returned may be wrong, but kvm_vcpu_kick() in __apic_accept_irq
456 * will cause vmexit immediately and the value will be recalculated
457 * on the next vmentry.
458 */
459 return apic_find_highest_irr(vcpu->arch.apic);
460 }
461
462 static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
463 int vector, int level, int trig_mode,
464 struct dest_map *dest_map);
465
466 int kvm_apic_set_irq(struct kvm_vcpu *vcpu, struct kvm_lapic_irq *irq,
467 struct dest_map *dest_map)
468 {
469 struct kvm_lapic *apic = vcpu->arch.apic;
470
471 return __apic_accept_irq(apic, irq->delivery_mode, irq->vector,
472 irq->level, irq->trig_mode, dest_map);
473 }
474
475 static int pv_eoi_put_user(struct kvm_vcpu *vcpu, u8 val)
476 {
477
478 return kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.pv_eoi.data, &val,
479 sizeof(val));
480 }
481
482 static int pv_eoi_get_user(struct kvm_vcpu *vcpu, u8 *val)
483 {
484
485 return kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.pv_eoi.data, val,
486 sizeof(*val));
487 }
488
489 static inline bool pv_eoi_enabled(struct kvm_vcpu *vcpu)
490 {
491 return vcpu->arch.pv_eoi.msr_val & KVM_MSR_ENABLED;
492 }
493
494 static bool pv_eoi_get_pending(struct kvm_vcpu *vcpu)
495 {
496 u8 val;
497 if (pv_eoi_get_user(vcpu, &val) < 0)
498 apic_debug("Can't read EOI MSR value: 0x%llx\n",
499 (unsigned long long)vcpu->arch.pv_eoi.msr_val);
500 return val & 0x1;
501 }
502
503 static void pv_eoi_set_pending(struct kvm_vcpu *vcpu)
504 {
505 if (pv_eoi_put_user(vcpu, KVM_PV_EOI_ENABLED) < 0) {
506 apic_debug("Can't set EOI MSR value: 0x%llx\n",
507 (unsigned long long)vcpu->arch.pv_eoi.msr_val);
508 return;
509 }
510 __set_bit(KVM_APIC_PV_EOI_PENDING, &vcpu->arch.apic_attention);
511 }
512
513 static void pv_eoi_clr_pending(struct kvm_vcpu *vcpu)
514 {
515 if (pv_eoi_put_user(vcpu, KVM_PV_EOI_DISABLED) < 0) {
516 apic_debug("Can't clear EOI MSR value: 0x%llx\n",
517 (unsigned long long)vcpu->arch.pv_eoi.msr_val);
518 return;
519 }
520 __clear_bit(KVM_APIC_PV_EOI_PENDING, &vcpu->arch.apic_attention);
521 }
522
523 static void apic_update_ppr(struct kvm_lapic *apic)
524 {
525 u32 tpr, isrv, ppr, old_ppr;
526 int isr;
527
528 old_ppr = kvm_lapic_get_reg(apic, APIC_PROCPRI);
529 tpr = kvm_lapic_get_reg(apic, APIC_TASKPRI);
530 isr = apic_find_highest_isr(apic);
531 isrv = (isr != -1) ? isr : 0;
532
533 if ((tpr & 0xf0) >= (isrv & 0xf0))
534 ppr = tpr & 0xff;
535 else
536 ppr = isrv & 0xf0;
537
538 apic_debug("vlapic %p, ppr 0x%x, isr 0x%x, isrv 0x%x",
539 apic, ppr, isr, isrv);
540
541 if (old_ppr != ppr) {
542 kvm_lapic_set_reg(apic, APIC_PROCPRI, ppr);
543 if (ppr < old_ppr)
544 kvm_make_request(KVM_REQ_EVENT, apic->vcpu);
545 }
546 }
547
548 static void apic_set_tpr(struct kvm_lapic *apic, u32 tpr)
549 {
550 kvm_lapic_set_reg(apic, APIC_TASKPRI, tpr);
551 apic_update_ppr(apic);
552 }
553
554 static bool kvm_apic_broadcast(struct kvm_lapic *apic, u32 mda)
555 {
556 if (apic_x2apic_mode(apic))
557 return mda == X2APIC_BROADCAST;
558
559 return GET_APIC_DEST_FIELD(mda) == APIC_BROADCAST;
560 }
561
562 static bool kvm_apic_match_physical_addr(struct kvm_lapic *apic, u32 mda)
563 {
564 if (kvm_apic_broadcast(apic, mda))
565 return true;
566
567 if (apic_x2apic_mode(apic))
568 return mda == kvm_apic_id(apic);
569
570 return mda == SET_APIC_DEST_FIELD(kvm_apic_id(apic));
571 }
572
573 static bool kvm_apic_match_logical_addr(struct kvm_lapic *apic, u32 mda)
574 {
575 u32 logical_id;
576
577 if (kvm_apic_broadcast(apic, mda))
578 return true;
579
580 logical_id = kvm_lapic_get_reg(apic, APIC_LDR);
581
582 if (apic_x2apic_mode(apic))
583 return ((logical_id >> 16) == (mda >> 16))
584 && (logical_id & mda & 0xffff) != 0;
585
586 logical_id = GET_APIC_LOGICAL_ID(logical_id);
587 mda = GET_APIC_DEST_FIELD(mda);
588
589 switch (kvm_lapic_get_reg(apic, APIC_DFR)) {
590 case APIC_DFR_FLAT:
591 return (logical_id & mda) != 0;
592 case APIC_DFR_CLUSTER:
593 return ((logical_id >> 4) == (mda >> 4))
594 && (logical_id & mda & 0xf) != 0;
595 default:
596 apic_debug("Bad DFR vcpu %d: %08x\n",
597 apic->vcpu->vcpu_id, kvm_lapic_get_reg(apic, APIC_DFR));
598 return false;
599 }
600 }
601
602 /* KVM APIC implementation has two quirks
603 * - dest always begins at 0 while xAPIC MDA has offset 24,
604 * - IOxAPIC messages have to be delivered (directly) to x2APIC.
605 */
606 static u32 kvm_apic_mda(unsigned int dest_id, struct kvm_lapic *source,
607 struct kvm_lapic *target)
608 {
609 bool ipi = source != NULL;
610 bool x2apic_mda = apic_x2apic_mode(ipi ? source : target);
611
612 if (!ipi && dest_id == APIC_BROADCAST && x2apic_mda)
613 return X2APIC_BROADCAST;
614
615 return x2apic_mda ? dest_id : SET_APIC_DEST_FIELD(dest_id);
616 }
617
618 bool kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
619 int short_hand, unsigned int dest, int dest_mode)
620 {
621 struct kvm_lapic *target = vcpu->arch.apic;
622 u32 mda = kvm_apic_mda(dest, source, target);
623
624 apic_debug("target %p, source %p, dest 0x%x, "
625 "dest_mode 0x%x, short_hand 0x%x\n",
626 target, source, dest, dest_mode, short_hand);
627
628 ASSERT(target);
629 switch (short_hand) {
630 case APIC_DEST_NOSHORT:
631 if (dest_mode == APIC_DEST_PHYSICAL)
632 return kvm_apic_match_physical_addr(target, mda);
633 else
634 return kvm_apic_match_logical_addr(target, mda);
635 case APIC_DEST_SELF:
636 return target == source;
637 case APIC_DEST_ALLINC:
638 return true;
639 case APIC_DEST_ALLBUT:
640 return target != source;
641 default:
642 apic_debug("kvm: apic: Bad dest shorthand value %x\n",
643 short_hand);
644 return false;
645 }
646 }
647 EXPORT_SYMBOL_GPL(kvm_apic_match_dest);
648
649 int kvm_vector_to_index(u32 vector, u32 dest_vcpus,
650 const unsigned long *bitmap, u32 bitmap_size)
651 {
652 u32 mod;
653 int i, idx = -1;
654
655 mod = vector % dest_vcpus;
656
657 for (i = 0; i <= mod; i++) {
658 idx = find_next_bit(bitmap, bitmap_size, idx + 1);
659 BUG_ON(idx == bitmap_size);
660 }
661
662 return idx;
663 }
664
665 static void kvm_apic_disabled_lapic_found(struct kvm *kvm)
666 {
667 if (!kvm->arch.disabled_lapic_found) {
668 kvm->arch.disabled_lapic_found = true;
669 printk(KERN_INFO
670 "Disabled LAPIC found during irq injection\n");
671 }
672 }
673
674 bool kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct kvm_lapic *src,
675 struct kvm_lapic_irq *irq, int *r, struct dest_map *dest_map)
676 {
677 struct kvm_apic_map *map;
678 unsigned long bitmap = 1;
679 struct kvm_lapic **dst;
680 int i;
681 bool ret, x2apic_ipi;
682
683 *r = -1;
684
685 if (irq->shorthand == APIC_DEST_SELF) {
686 *r = kvm_apic_set_irq(src->vcpu, irq, dest_map);
687 return true;
688 }
689
690 if (irq->shorthand)
691 return false;
692
693 x2apic_ipi = src && apic_x2apic_mode(src);
694 if (irq->dest_id == (x2apic_ipi ? X2APIC_BROADCAST : APIC_BROADCAST))
695 return false;
696
697 ret = true;
698 rcu_read_lock();
699 map = rcu_dereference(kvm->arch.apic_map);
700
701 if (!map) {
702 ret = false;
703 goto out;
704 }
705
706 if (irq->dest_mode == APIC_DEST_PHYSICAL) {
707 if (irq->dest_id >= ARRAY_SIZE(map->phys_map))
708 goto out;
709
710 dst = &map->phys_map[irq->dest_id];
711 } else {
712 u16 cid;
713
714 if (!kvm_apic_logical_map_valid(map)) {
715 ret = false;
716 goto out;
717 }
718
719 apic_logical_id(map, irq->dest_id, &cid, (u16 *)&bitmap);
720
721 if (cid >= ARRAY_SIZE(map->logical_map))
722 goto out;
723
724 dst = map->logical_map[cid];
725
726 if (!kvm_lowest_prio_delivery(irq))
727 goto set_irq;
728
729 if (!kvm_vector_hashing_enabled()) {
730 int l = -1;
731 for_each_set_bit(i, &bitmap, 16) {
732 if (!dst[i])
733 continue;
734 if (l < 0)
735 l = i;
736 else if (kvm_apic_compare_prio(dst[i]->vcpu,
737 dst[l]->vcpu) < 0)
738 l = i;
739 }
740 bitmap = (l >= 0) ? 1 << l : 0;
741 } else {
742 int idx;
743 unsigned int dest_vcpus;
744
745 dest_vcpus = hweight16(bitmap);
746 if (dest_vcpus == 0)
747 goto out;
748
749 idx = kvm_vector_to_index(irq->vector,
750 dest_vcpus, &bitmap, 16);
751
752 if (!dst[idx]) {
753 kvm_apic_disabled_lapic_found(kvm);
754 goto out;
755 }
756
757 bitmap = (idx >= 0) ? 1 << idx : 0;
758 }
759 }
760
761 set_irq:
762 for_each_set_bit(i, &bitmap, 16) {
763 if (!dst[i])
764 continue;
765 if (*r < 0)
766 *r = 0;
767 *r += kvm_apic_set_irq(dst[i]->vcpu, irq, dest_map);
768 }
769 out:
770 rcu_read_unlock();
771 return ret;
772 }
773
774 /*
775 * This routine tries to handler interrupts in posted mode, here is how
776 * it deals with different cases:
777 * - For single-destination interrupts, handle it in posted mode
778 * - Else if vector hashing is enabled and it is a lowest-priority
779 * interrupt, handle it in posted mode and use the following mechanism
780 * to find the destinaiton vCPU.
781 * 1. For lowest-priority interrupts, store all the possible
782 * destination vCPUs in an array.
783 * 2. Use "guest vector % max number of destination vCPUs" to find
784 * the right destination vCPU in the array for the lowest-priority
785 * interrupt.
786 * - Otherwise, use remapped mode to inject the interrupt.
787 */
788 bool kvm_intr_is_single_vcpu_fast(struct kvm *kvm, struct kvm_lapic_irq *irq,
789 struct kvm_vcpu **dest_vcpu)
790 {
791 struct kvm_apic_map *map;
792 bool ret = false;
793 struct kvm_lapic *dst = NULL;
794
795 if (irq->shorthand)
796 return false;
797
798 rcu_read_lock();
799 map = rcu_dereference(kvm->arch.apic_map);
800
801 if (!map)
802 goto out;
803
804 if (irq->dest_mode == APIC_DEST_PHYSICAL) {
805 if (irq->dest_id == 0xFF)
806 goto out;
807
808 if (irq->dest_id >= ARRAY_SIZE(map->phys_map))
809 goto out;
810
811 dst = map->phys_map[irq->dest_id];
812 if (dst && kvm_apic_present(dst->vcpu))
813 *dest_vcpu = dst->vcpu;
814 else
815 goto out;
816 } else {
817 u16 cid;
818 unsigned long bitmap = 1;
819 int i, r = 0;
820
821 if (!kvm_apic_logical_map_valid(map))
822 goto out;
823
824 apic_logical_id(map, irq->dest_id, &cid, (u16 *)&bitmap);
825
826 if (cid >= ARRAY_SIZE(map->logical_map))
827 goto out;
828
829 if (kvm_vector_hashing_enabled() &&
830 kvm_lowest_prio_delivery(irq)) {
831 int idx;
832 unsigned int dest_vcpus;
833
834 dest_vcpus = hweight16(bitmap);
835 if (dest_vcpus == 0)
836 goto out;
837
838 idx = kvm_vector_to_index(irq->vector, dest_vcpus,
839 &bitmap, 16);
840
841 dst = map->logical_map[cid][idx];
842 if (!dst) {
843 kvm_apic_disabled_lapic_found(kvm);
844 goto out;
845 }
846
847 *dest_vcpu = dst->vcpu;
848 } else {
849 for_each_set_bit(i, &bitmap, 16) {
850 dst = map->logical_map[cid][i];
851 if (++r == 2)
852 goto out;
853 }
854
855 if (dst && kvm_apic_present(dst->vcpu))
856 *dest_vcpu = dst->vcpu;
857 else
858 goto out;
859 }
860 }
861
862 ret = true;
863 out:
864 rcu_read_unlock();
865 return ret;
866 }
867
868 /*
869 * Add a pending IRQ into lapic.
870 * Return 1 if successfully added and 0 if discarded.
871 */
872 static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
873 int vector, int level, int trig_mode,
874 struct dest_map *dest_map)
875 {
876 int result = 0;
877 struct kvm_vcpu *vcpu = apic->vcpu;
878
879 trace_kvm_apic_accept_irq(vcpu->vcpu_id, delivery_mode,
880 trig_mode, vector);
881 switch (delivery_mode) {
882 case APIC_DM_LOWEST:
883 vcpu->arch.apic_arb_prio++;
884 case APIC_DM_FIXED:
885 if (unlikely(trig_mode && !level))
886 break;
887
888 /* FIXME add logic for vcpu on reset */
889 if (unlikely(!apic_enabled(apic)))
890 break;
891
892 result = 1;
893
894 if (dest_map) {
895 __set_bit(vcpu->vcpu_id, dest_map->map);
896 dest_map->vectors[vcpu->vcpu_id] = vector;
897 }
898
899 if (apic_test_vector(vector, apic->regs + APIC_TMR) != !!trig_mode) {
900 if (trig_mode)
901 kvm_lapic_set_vector(vector, apic->regs + APIC_TMR);
902 else
903 apic_clear_vector(vector, apic->regs + APIC_TMR);
904 }
905
906 if (vcpu->arch.apicv_active)
907 kvm_x86_ops->deliver_posted_interrupt(vcpu, vector);
908 else {
909 kvm_lapic_set_irr(vector, apic);
910
911 kvm_make_request(KVM_REQ_EVENT, vcpu);
912 kvm_vcpu_kick(vcpu);
913 }
914 break;
915
916 case APIC_DM_REMRD:
917 result = 1;
918 vcpu->arch.pv.pv_unhalted = 1;
919 kvm_make_request(KVM_REQ_EVENT, vcpu);
920 kvm_vcpu_kick(vcpu);
921 break;
922
923 case APIC_DM_SMI:
924 result = 1;
925 kvm_make_request(KVM_REQ_SMI, vcpu);
926 kvm_vcpu_kick(vcpu);
927 break;
928
929 case APIC_DM_NMI:
930 result = 1;
931 kvm_inject_nmi(vcpu);
932 kvm_vcpu_kick(vcpu);
933 break;
934
935 case APIC_DM_INIT:
936 if (!trig_mode || level) {
937 result = 1;
938 /* assumes that there are only KVM_APIC_INIT/SIPI */
939 apic->pending_events = (1UL << KVM_APIC_INIT);
940 /* make sure pending_events is visible before sending
941 * the request */
942 smp_wmb();
943 kvm_make_request(KVM_REQ_EVENT, vcpu);
944 kvm_vcpu_kick(vcpu);
945 } else {
946 apic_debug("Ignoring de-assert INIT to vcpu %d\n",
947 vcpu->vcpu_id);
948 }
949 break;
950
951 case APIC_DM_STARTUP:
952 apic_debug("SIPI to vcpu %d vector 0x%02x\n",
953 vcpu->vcpu_id, vector);
954 result = 1;
955 apic->sipi_vector = vector;
956 /* make sure sipi_vector is visible for the receiver */
957 smp_wmb();
958 set_bit(KVM_APIC_SIPI, &apic->pending_events);
959 kvm_make_request(KVM_REQ_EVENT, vcpu);
960 kvm_vcpu_kick(vcpu);
961 break;
962
963 case APIC_DM_EXTINT:
964 /*
965 * Should only be called by kvm_apic_local_deliver() with LVT0,
966 * before NMI watchdog was enabled. Already handled by
967 * kvm_apic_accept_pic_intr().
968 */
969 break;
970
971 default:
972 printk(KERN_ERR "TODO: unsupported delivery mode %x\n",
973 delivery_mode);
974 break;
975 }
976 return result;
977 }
978
979 int kvm_apic_compare_prio(struct kvm_vcpu *vcpu1, struct kvm_vcpu *vcpu2)
980 {
981 return vcpu1->arch.apic_arb_prio - vcpu2->arch.apic_arb_prio;
982 }
983
984 static bool kvm_ioapic_handles_vector(struct kvm_lapic *apic, int vector)
985 {
986 return test_bit(vector, apic->vcpu->arch.ioapic_handled_vectors);
987 }
988
989 static void kvm_ioapic_send_eoi(struct kvm_lapic *apic, int vector)
990 {
991 int trigger_mode;
992
993 /* Eoi the ioapic only if the ioapic doesn't own the vector. */
994 if (!kvm_ioapic_handles_vector(apic, vector))
995 return;
996
997 /* Request a KVM exit to inform the userspace IOAPIC. */
998 if (irqchip_split(apic->vcpu->kvm)) {
999 apic->vcpu->arch.pending_ioapic_eoi = vector;
1000 kvm_make_request(KVM_REQ_IOAPIC_EOI_EXIT, apic->vcpu);
1001 return;
1002 }
1003
1004 if (apic_test_vector(vector, apic->regs + APIC_TMR))
1005 trigger_mode = IOAPIC_LEVEL_TRIG;
1006 else
1007 trigger_mode = IOAPIC_EDGE_TRIG;
1008
1009 kvm_ioapic_update_eoi(apic->vcpu, vector, trigger_mode);
1010 }
1011
1012 static int apic_set_eoi(struct kvm_lapic *apic)
1013 {
1014 int vector = apic_find_highest_isr(apic);
1015
1016 trace_kvm_eoi(apic, vector);
1017
1018 /*
1019 * Not every write EOI will has corresponding ISR,
1020 * one example is when Kernel check timer on setup_IO_APIC
1021 */
1022 if (vector == -1)
1023 return vector;
1024
1025 apic_clear_isr(vector, apic);
1026 apic_update_ppr(apic);
1027
1028 if (test_bit(vector, vcpu_to_synic(apic->vcpu)->vec_bitmap))
1029 kvm_hv_synic_send_eoi(apic->vcpu, vector);
1030
1031 kvm_ioapic_send_eoi(apic, vector);
1032 kvm_make_request(KVM_REQ_EVENT, apic->vcpu);
1033 return vector;
1034 }
1035
1036 /*
1037 * this interface assumes a trap-like exit, which has already finished
1038 * desired side effect including vISR and vPPR update.
1039 */
1040 void kvm_apic_set_eoi_accelerated(struct kvm_vcpu *vcpu, int vector)
1041 {
1042 struct kvm_lapic *apic = vcpu->arch.apic;
1043
1044 trace_kvm_eoi(apic, vector);
1045
1046 kvm_ioapic_send_eoi(apic, vector);
1047 kvm_make_request(KVM_REQ_EVENT, apic->vcpu);
1048 }
1049 EXPORT_SYMBOL_GPL(kvm_apic_set_eoi_accelerated);
1050
1051 static void apic_send_ipi(struct kvm_lapic *apic)
1052 {
1053 u32 icr_low = kvm_lapic_get_reg(apic, APIC_ICR);
1054 u32 icr_high = kvm_lapic_get_reg(apic, APIC_ICR2);
1055 struct kvm_lapic_irq irq;
1056
1057 irq.vector = icr_low & APIC_VECTOR_MASK;
1058 irq.delivery_mode = icr_low & APIC_MODE_MASK;
1059 irq.dest_mode = icr_low & APIC_DEST_MASK;
1060 irq.level = (icr_low & APIC_INT_ASSERT) != 0;
1061 irq.trig_mode = icr_low & APIC_INT_LEVELTRIG;
1062 irq.shorthand = icr_low & APIC_SHORT_MASK;
1063 irq.msi_redir_hint = false;
1064 if (apic_x2apic_mode(apic))
1065 irq.dest_id = icr_high;
1066 else
1067 irq.dest_id = GET_APIC_DEST_FIELD(icr_high);
1068
1069 trace_kvm_apic_ipi(icr_low, irq.dest_id);
1070
1071 apic_debug("icr_high 0x%x, icr_low 0x%x, "
1072 "short_hand 0x%x, dest 0x%x, trig_mode 0x%x, level 0x%x, "
1073 "dest_mode 0x%x, delivery_mode 0x%x, vector 0x%x, "
1074 "msi_redir_hint 0x%x\n",
1075 icr_high, icr_low, irq.shorthand, irq.dest_id,
1076 irq.trig_mode, irq.level, irq.dest_mode, irq.delivery_mode,
1077 irq.vector, irq.msi_redir_hint);
1078
1079 kvm_irq_delivery_to_apic(apic->vcpu->kvm, apic, &irq, NULL);
1080 }
1081
1082 static u32 apic_get_tmcct(struct kvm_lapic *apic)
1083 {
1084 ktime_t remaining;
1085 s64 ns;
1086 u32 tmcct;
1087
1088 ASSERT(apic != NULL);
1089
1090 /* if initial count is 0, current count should also be 0 */
1091 if (kvm_lapic_get_reg(apic, APIC_TMICT) == 0 ||
1092 apic->lapic_timer.period == 0)
1093 return 0;
1094
1095 remaining = hrtimer_get_remaining(&apic->lapic_timer.timer);
1096 if (ktime_to_ns(remaining) < 0)
1097 remaining = ktime_set(0, 0);
1098
1099 ns = mod_64(ktime_to_ns(remaining), apic->lapic_timer.period);
1100 tmcct = div64_u64(ns,
1101 (APIC_BUS_CYCLE_NS * apic->divide_count));
1102
1103 return tmcct;
1104 }
1105
1106 static void __report_tpr_access(struct kvm_lapic *apic, bool write)
1107 {
1108 struct kvm_vcpu *vcpu = apic->vcpu;
1109 struct kvm_run *run = vcpu->run;
1110
1111 kvm_make_request(KVM_REQ_REPORT_TPR_ACCESS, vcpu);
1112 run->tpr_access.rip = kvm_rip_read(vcpu);
1113 run->tpr_access.is_write = write;
1114 }
1115
1116 static inline void report_tpr_access(struct kvm_lapic *apic, bool write)
1117 {
1118 if (apic->vcpu->arch.tpr_access_reporting)
1119 __report_tpr_access(apic, write);
1120 }
1121
1122 static u32 __apic_read(struct kvm_lapic *apic, unsigned int offset)
1123 {
1124 u32 val = 0;
1125
1126 if (offset >= LAPIC_MMIO_LENGTH)
1127 return 0;
1128
1129 switch (offset) {
1130 case APIC_ID:
1131 if (apic_x2apic_mode(apic))
1132 val = kvm_apic_id(apic);
1133 else
1134 val = kvm_apic_id(apic) << 24;
1135 break;
1136 case APIC_ARBPRI:
1137 apic_debug("Access APIC ARBPRI register which is for P6\n");
1138 break;
1139
1140 case APIC_TMCCT: /* Timer CCR */
1141 if (apic_lvtt_tscdeadline(apic))
1142 return 0;
1143
1144 val = apic_get_tmcct(apic);
1145 break;
1146 case APIC_PROCPRI:
1147 apic_update_ppr(apic);
1148 val = kvm_lapic_get_reg(apic, offset);
1149 break;
1150 case APIC_TASKPRI:
1151 report_tpr_access(apic, false);
1152 /* fall thru */
1153 default:
1154 val = kvm_lapic_get_reg(apic, offset);
1155 break;
1156 }
1157
1158 return val;
1159 }
1160
1161 static inline struct kvm_lapic *to_lapic(struct kvm_io_device *dev)
1162 {
1163 return container_of(dev, struct kvm_lapic, dev);
1164 }
1165
1166 int kvm_lapic_reg_read(struct kvm_lapic *apic, u32 offset, int len,
1167 void *data)
1168 {
1169 unsigned char alignment = offset & 0xf;
1170 u32 result;
1171 /* this bitmask has a bit cleared for each reserved register */
1172 static const u64 rmask = 0x43ff01ffffffe70cULL;
1173
1174 if ((alignment + len) > 4) {
1175 apic_debug("KVM_APIC_READ: alignment error %x %d\n",
1176 offset, len);
1177 return 1;
1178 }
1179
1180 if (offset > 0x3f0 || !(rmask & (1ULL << (offset >> 4)))) {
1181 apic_debug("KVM_APIC_READ: read reserved register %x\n",
1182 offset);
1183 return 1;
1184 }
1185
1186 result = __apic_read(apic, offset & ~0xf);
1187
1188 trace_kvm_apic_read(offset, result);
1189
1190 switch (len) {
1191 case 1:
1192 case 2:
1193 case 4:
1194 memcpy(data, (char *)&result + alignment, len);
1195 break;
1196 default:
1197 printk(KERN_ERR "Local APIC read with len = %x, "
1198 "should be 1,2, or 4 instead\n", len);
1199 break;
1200 }
1201 return 0;
1202 }
1203 EXPORT_SYMBOL_GPL(kvm_lapic_reg_read);
1204
1205 static int apic_mmio_in_range(struct kvm_lapic *apic, gpa_t addr)
1206 {
1207 return kvm_apic_hw_enabled(apic) &&
1208 addr >= apic->base_address &&
1209 addr < apic->base_address + LAPIC_MMIO_LENGTH;
1210 }
1211
1212 static int apic_mmio_read(struct kvm_vcpu *vcpu, struct kvm_io_device *this,
1213 gpa_t address, int len, void *data)
1214 {
1215 struct kvm_lapic *apic = to_lapic(this);
1216 u32 offset = address - apic->base_address;
1217
1218 if (!apic_mmio_in_range(apic, address))
1219 return -EOPNOTSUPP;
1220
1221 kvm_lapic_reg_read(apic, offset, len, data);
1222
1223 return 0;
1224 }
1225
1226 static void update_divide_count(struct kvm_lapic *apic)
1227 {
1228 u32 tmp1, tmp2, tdcr;
1229
1230 tdcr = kvm_lapic_get_reg(apic, APIC_TDCR);
1231 tmp1 = tdcr & 0xf;
1232 tmp2 = ((tmp1 & 0x3) | ((tmp1 & 0x8) >> 1)) + 1;
1233 apic->divide_count = 0x1 << (tmp2 & 0x7);
1234
1235 apic_debug("timer divide count is 0x%x\n",
1236 apic->divide_count);
1237 }
1238
1239 static void apic_update_lvtt(struct kvm_lapic *apic)
1240 {
1241 u32 timer_mode = kvm_lapic_get_reg(apic, APIC_LVTT) &
1242 apic->lapic_timer.timer_mode_mask;
1243
1244 if (apic->lapic_timer.timer_mode != timer_mode) {
1245 apic->lapic_timer.timer_mode = timer_mode;
1246 hrtimer_cancel(&apic->lapic_timer.timer);
1247 }
1248 }
1249
1250 static void apic_timer_expired(struct kvm_lapic *apic)
1251 {
1252 struct kvm_vcpu *vcpu = apic->vcpu;
1253 struct swait_queue_head *q = &vcpu->wq;
1254 struct kvm_timer *ktimer = &apic->lapic_timer;
1255
1256 if (atomic_read(&apic->lapic_timer.pending))
1257 return;
1258
1259 atomic_inc(&apic->lapic_timer.pending);
1260 kvm_set_pending_timer(vcpu);
1261
1262 if (swait_active(q))
1263 swake_up(q);
1264
1265 if (apic_lvtt_tscdeadline(apic))
1266 ktimer->expired_tscdeadline = ktimer->tscdeadline;
1267 }
1268
1269 /*
1270 * On APICv, this test will cause a busy wait
1271 * during a higher-priority task.
1272 */
1273
1274 static bool lapic_timer_int_injected(struct kvm_vcpu *vcpu)
1275 {
1276 struct kvm_lapic *apic = vcpu->arch.apic;
1277 u32 reg = kvm_lapic_get_reg(apic, APIC_LVTT);
1278
1279 if (kvm_apic_hw_enabled(apic)) {
1280 int vec = reg & APIC_VECTOR_MASK;
1281 void *bitmap = apic->regs + APIC_ISR;
1282
1283 if (vcpu->arch.apicv_active)
1284 bitmap = apic->regs + APIC_IRR;
1285
1286 if (apic_test_vector(vec, bitmap))
1287 return true;
1288 }
1289 return false;
1290 }
1291
1292 void wait_lapic_expire(struct kvm_vcpu *vcpu)
1293 {
1294 struct kvm_lapic *apic = vcpu->arch.apic;
1295 u64 guest_tsc, tsc_deadline;
1296
1297 if (!lapic_in_kernel(vcpu))
1298 return;
1299
1300 if (apic->lapic_timer.expired_tscdeadline == 0)
1301 return;
1302
1303 if (!lapic_timer_int_injected(vcpu))
1304 return;
1305
1306 tsc_deadline = apic->lapic_timer.expired_tscdeadline;
1307 apic->lapic_timer.expired_tscdeadline = 0;
1308 guest_tsc = kvm_read_l1_tsc(vcpu, rdtsc());
1309 trace_kvm_wait_lapic_expire(vcpu->vcpu_id, guest_tsc - tsc_deadline);
1310
1311 /* __delay is delay_tsc whenever the hardware has TSC, thus always. */
1312 if (guest_tsc < tsc_deadline)
1313 __delay(tsc_deadline - guest_tsc);
1314 }
1315
1316 static void start_sw_tscdeadline(struct kvm_lapic *apic)
1317 {
1318 u64 guest_tsc, tscdeadline = apic->lapic_timer.tscdeadline;
1319 u64 ns = 0;
1320 ktime_t expire;
1321 struct kvm_vcpu *vcpu = apic->vcpu;
1322 unsigned long this_tsc_khz = vcpu->arch.virtual_tsc_khz;
1323 unsigned long flags;
1324 ktime_t now;
1325
1326 if (unlikely(!tscdeadline || !this_tsc_khz))
1327 return;
1328
1329 local_irq_save(flags);
1330
1331 now = apic->lapic_timer.timer.base->get_time();
1332 guest_tsc = kvm_read_l1_tsc(vcpu, rdtsc());
1333 if (likely(tscdeadline > guest_tsc)) {
1334 ns = (tscdeadline - guest_tsc) * 1000000ULL;
1335 do_div(ns, this_tsc_khz);
1336 expire = ktime_add_ns(now, ns);
1337 expire = ktime_sub_ns(expire, lapic_timer_advance_ns);
1338 hrtimer_start(&apic->lapic_timer.timer,
1339 expire, HRTIMER_MODE_ABS_PINNED);
1340 } else
1341 apic_timer_expired(apic);
1342
1343 local_irq_restore(flags);
1344 }
1345
1346 bool kvm_lapic_hv_timer_in_use(struct kvm_vcpu *vcpu)
1347 {
1348 return vcpu->arch.apic->lapic_timer.hv_timer_in_use;
1349 }
1350 EXPORT_SYMBOL_GPL(kvm_lapic_hv_timer_in_use);
1351
1352 static void cancel_hv_tscdeadline(struct kvm_lapic *apic)
1353 {
1354 kvm_x86_ops->cancel_hv_timer(apic->vcpu);
1355 apic->lapic_timer.hv_timer_in_use = false;
1356 }
1357
1358 void kvm_lapic_expired_hv_timer(struct kvm_vcpu *vcpu)
1359 {
1360 struct kvm_lapic *apic = vcpu->arch.apic;
1361
1362 WARN_ON(!apic->lapic_timer.hv_timer_in_use);
1363 WARN_ON(swait_active(&vcpu->wq));
1364 cancel_hv_tscdeadline(apic);
1365 apic_timer_expired(apic);
1366 }
1367 EXPORT_SYMBOL_GPL(kvm_lapic_expired_hv_timer);
1368
1369 static bool start_hv_tscdeadline(struct kvm_lapic *apic)
1370 {
1371 u64 tscdeadline = apic->lapic_timer.tscdeadline;
1372
1373 if (atomic_read(&apic->lapic_timer.pending) ||
1374 kvm_x86_ops->set_hv_timer(apic->vcpu, tscdeadline)) {
1375 if (apic->lapic_timer.hv_timer_in_use)
1376 cancel_hv_tscdeadline(apic);
1377 } else {
1378 apic->lapic_timer.hv_timer_in_use = true;
1379 hrtimer_cancel(&apic->lapic_timer.timer);
1380
1381 /* In case the sw timer triggered in the window */
1382 if (atomic_read(&apic->lapic_timer.pending))
1383 cancel_hv_tscdeadline(apic);
1384 }
1385 trace_kvm_hv_timer_state(apic->vcpu->vcpu_id,
1386 apic->lapic_timer.hv_timer_in_use);
1387 return apic->lapic_timer.hv_timer_in_use;
1388 }
1389
1390 void kvm_lapic_switch_to_hv_timer(struct kvm_vcpu *vcpu)
1391 {
1392 struct kvm_lapic *apic = vcpu->arch.apic;
1393
1394 WARN_ON(apic->lapic_timer.hv_timer_in_use);
1395
1396 if (apic_lvtt_tscdeadline(apic))
1397 start_hv_tscdeadline(apic);
1398 }
1399 EXPORT_SYMBOL_GPL(kvm_lapic_switch_to_hv_timer);
1400
1401 void kvm_lapic_switch_to_sw_timer(struct kvm_vcpu *vcpu)
1402 {
1403 struct kvm_lapic *apic = vcpu->arch.apic;
1404
1405 /* Possibly the TSC deadline timer is not enabled yet */
1406 if (!apic->lapic_timer.hv_timer_in_use)
1407 return;
1408
1409 cancel_hv_tscdeadline(apic);
1410
1411 if (atomic_read(&apic->lapic_timer.pending))
1412 return;
1413
1414 start_sw_tscdeadline(apic);
1415 }
1416 EXPORT_SYMBOL_GPL(kvm_lapic_switch_to_sw_timer);
1417
1418 static void start_apic_timer(struct kvm_lapic *apic)
1419 {
1420 ktime_t now;
1421
1422 atomic_set(&apic->lapic_timer.pending, 0);
1423
1424 if (apic_lvtt_period(apic) || apic_lvtt_oneshot(apic)) {
1425 /* lapic timer in oneshot or periodic mode */
1426 now = apic->lapic_timer.timer.base->get_time();
1427 apic->lapic_timer.period = (u64)kvm_lapic_get_reg(apic, APIC_TMICT)
1428 * APIC_BUS_CYCLE_NS * apic->divide_count;
1429
1430 if (!apic->lapic_timer.period)
1431 return;
1432 /*
1433 * Do not allow the guest to program periodic timers with small
1434 * interval, since the hrtimers are not throttled by the host
1435 * scheduler.
1436 */
1437 if (apic_lvtt_period(apic)) {
1438 s64 min_period = min_timer_period_us * 1000LL;
1439
1440 if (apic->lapic_timer.period < min_period) {
1441 pr_info_ratelimited(
1442 "kvm: vcpu %i: requested %lld ns "
1443 "lapic timer period limited to %lld ns\n",
1444 apic->vcpu->vcpu_id,
1445 apic->lapic_timer.period, min_period);
1446 apic->lapic_timer.period = min_period;
1447 }
1448 }
1449
1450 hrtimer_start(&apic->lapic_timer.timer,
1451 ktime_add_ns(now, apic->lapic_timer.period),
1452 HRTIMER_MODE_ABS_PINNED);
1453
1454 apic_debug("%s: bus cycle is %" PRId64 "ns, now 0x%016"
1455 PRIx64 ", "
1456 "timer initial count 0x%x, period %lldns, "
1457 "expire @ 0x%016" PRIx64 ".\n", __func__,
1458 APIC_BUS_CYCLE_NS, ktime_to_ns(now),
1459 kvm_lapic_get_reg(apic, APIC_TMICT),
1460 apic->lapic_timer.period,
1461 ktime_to_ns(ktime_add_ns(now,
1462 apic->lapic_timer.period)));
1463 } else if (apic_lvtt_tscdeadline(apic)) {
1464 if (!(kvm_x86_ops->set_hv_timer && start_hv_tscdeadline(apic)))
1465 start_sw_tscdeadline(apic);
1466 }
1467 }
1468
1469 static void apic_manage_nmi_watchdog(struct kvm_lapic *apic, u32 lvt0_val)
1470 {
1471 bool lvt0_in_nmi_mode = apic_lvt_nmi_mode(lvt0_val);
1472
1473 if (apic->lvt0_in_nmi_mode != lvt0_in_nmi_mode) {
1474 apic->lvt0_in_nmi_mode = lvt0_in_nmi_mode;
1475 if (lvt0_in_nmi_mode) {
1476 apic_debug("Receive NMI setting on APIC_LVT0 "
1477 "for cpu %d\n", apic->vcpu->vcpu_id);
1478 atomic_inc(&apic->vcpu->kvm->arch.vapics_in_nmi_mode);
1479 } else
1480 atomic_dec(&apic->vcpu->kvm->arch.vapics_in_nmi_mode);
1481 }
1482 }
1483
1484 int kvm_lapic_reg_write(struct kvm_lapic *apic, u32 reg, u32 val)
1485 {
1486 int ret = 0;
1487
1488 trace_kvm_apic_write(reg, val);
1489
1490 switch (reg) {
1491 case APIC_ID: /* Local APIC ID */
1492 if (!apic_x2apic_mode(apic))
1493 kvm_apic_set_id(apic, val >> 24);
1494 else
1495 ret = 1;
1496 break;
1497
1498 case APIC_TASKPRI:
1499 report_tpr_access(apic, true);
1500 apic_set_tpr(apic, val & 0xff);
1501 break;
1502
1503 case APIC_EOI:
1504 apic_set_eoi(apic);
1505 break;
1506
1507 case APIC_LDR:
1508 if (!apic_x2apic_mode(apic))
1509 kvm_apic_set_ldr(apic, val & APIC_LDR_MASK);
1510 else
1511 ret = 1;
1512 break;
1513
1514 case APIC_DFR:
1515 if (!apic_x2apic_mode(apic)) {
1516 kvm_lapic_set_reg(apic, APIC_DFR, val | 0x0FFFFFFF);
1517 recalculate_apic_map(apic->vcpu->kvm);
1518 } else
1519 ret = 1;
1520 break;
1521
1522 case APIC_SPIV: {
1523 u32 mask = 0x3ff;
1524 if (kvm_lapic_get_reg(apic, APIC_LVR) & APIC_LVR_DIRECTED_EOI)
1525 mask |= APIC_SPIV_DIRECTED_EOI;
1526 apic_set_spiv(apic, val & mask);
1527 if (!(val & APIC_SPIV_APIC_ENABLED)) {
1528 int i;
1529 u32 lvt_val;
1530
1531 for (i = 0; i < KVM_APIC_LVT_NUM; i++) {
1532 lvt_val = kvm_lapic_get_reg(apic,
1533 APIC_LVTT + 0x10 * i);
1534 kvm_lapic_set_reg(apic, APIC_LVTT + 0x10 * i,
1535 lvt_val | APIC_LVT_MASKED);
1536 }
1537 apic_update_lvtt(apic);
1538 atomic_set(&apic->lapic_timer.pending, 0);
1539
1540 }
1541 break;
1542 }
1543 case APIC_ICR:
1544 /* No delay here, so we always clear the pending bit */
1545 kvm_lapic_set_reg(apic, APIC_ICR, val & ~(1 << 12));
1546 apic_send_ipi(apic);
1547 break;
1548
1549 case APIC_ICR2:
1550 if (!apic_x2apic_mode(apic))
1551 val &= 0xff000000;
1552 kvm_lapic_set_reg(apic, APIC_ICR2, val);
1553 break;
1554
1555 case APIC_LVT0:
1556 apic_manage_nmi_watchdog(apic, val);
1557 case APIC_LVTTHMR:
1558 case APIC_LVTPC:
1559 case APIC_LVT1:
1560 case APIC_LVTERR:
1561 /* TODO: Check vector */
1562 if (!kvm_apic_sw_enabled(apic))
1563 val |= APIC_LVT_MASKED;
1564
1565 val &= apic_lvt_mask[(reg - APIC_LVTT) >> 4];
1566 kvm_lapic_set_reg(apic, reg, val);
1567
1568 break;
1569
1570 case APIC_LVTT:
1571 if (!kvm_apic_sw_enabled(apic))
1572 val |= APIC_LVT_MASKED;
1573 val &= (apic_lvt_mask[0] | apic->lapic_timer.timer_mode_mask);
1574 kvm_lapic_set_reg(apic, APIC_LVTT, val);
1575 apic_update_lvtt(apic);
1576 break;
1577
1578 case APIC_TMICT:
1579 if (apic_lvtt_tscdeadline(apic))
1580 break;
1581
1582 hrtimer_cancel(&apic->lapic_timer.timer);
1583 kvm_lapic_set_reg(apic, APIC_TMICT, val);
1584 start_apic_timer(apic);
1585 break;
1586
1587 case APIC_TDCR:
1588 if (val & 4)
1589 apic_debug("KVM_WRITE:TDCR %x\n", val);
1590 kvm_lapic_set_reg(apic, APIC_TDCR, val);
1591 update_divide_count(apic);
1592 break;
1593
1594 case APIC_ESR:
1595 if (apic_x2apic_mode(apic) && val != 0) {
1596 apic_debug("KVM_WRITE:ESR not zero %x\n", val);
1597 ret = 1;
1598 }
1599 break;
1600
1601 case APIC_SELF_IPI:
1602 if (apic_x2apic_mode(apic)) {
1603 kvm_lapic_reg_write(apic, APIC_ICR, 0x40000 | (val & 0xff));
1604 } else
1605 ret = 1;
1606 break;
1607 default:
1608 ret = 1;
1609 break;
1610 }
1611 if (ret)
1612 apic_debug("Local APIC Write to read-only register %x\n", reg);
1613 return ret;
1614 }
1615 EXPORT_SYMBOL_GPL(kvm_lapic_reg_write);
1616
1617 static int apic_mmio_write(struct kvm_vcpu *vcpu, struct kvm_io_device *this,
1618 gpa_t address, int len, const void *data)
1619 {
1620 struct kvm_lapic *apic = to_lapic(this);
1621 unsigned int offset = address - apic->base_address;
1622 u32 val;
1623
1624 if (!apic_mmio_in_range(apic, address))
1625 return -EOPNOTSUPP;
1626
1627 /*
1628 * APIC register must be aligned on 128-bits boundary.
1629 * 32/64/128 bits registers must be accessed thru 32 bits.
1630 * Refer SDM 8.4.1
1631 */
1632 if (len != 4 || (offset & 0xf)) {
1633 /* Don't shout loud, $infamous_os would cause only noise. */
1634 apic_debug("apic write: bad size=%d %lx\n", len, (long)address);
1635 return 0;
1636 }
1637
1638 val = *(u32*)data;
1639
1640 /* too common printing */
1641 if (offset != APIC_EOI)
1642 apic_debug("%s: offset 0x%x with length 0x%x, and value is "
1643 "0x%x\n", __func__, offset, len, val);
1644
1645 kvm_lapic_reg_write(apic, offset & 0xff0, val);
1646
1647 return 0;
1648 }
1649
1650 void kvm_lapic_set_eoi(struct kvm_vcpu *vcpu)
1651 {
1652 kvm_lapic_reg_write(vcpu->arch.apic, APIC_EOI, 0);
1653 }
1654 EXPORT_SYMBOL_GPL(kvm_lapic_set_eoi);
1655
1656 /* emulate APIC access in a trap manner */
1657 void kvm_apic_write_nodecode(struct kvm_vcpu *vcpu, u32 offset)
1658 {
1659 u32 val = 0;
1660
1661 /* hw has done the conditional check and inst decode */
1662 offset &= 0xff0;
1663
1664 kvm_lapic_reg_read(vcpu->arch.apic, offset, 4, &val);
1665
1666 /* TODO: optimize to just emulate side effect w/o one more write */
1667 kvm_lapic_reg_write(vcpu->arch.apic, offset, val);
1668 }
1669 EXPORT_SYMBOL_GPL(kvm_apic_write_nodecode);
1670
1671 void kvm_free_lapic(struct kvm_vcpu *vcpu)
1672 {
1673 struct kvm_lapic *apic = vcpu->arch.apic;
1674
1675 if (!vcpu->arch.apic)
1676 return;
1677
1678 hrtimer_cancel(&apic->lapic_timer.timer);
1679
1680 if (!(vcpu->arch.apic_base & MSR_IA32_APICBASE_ENABLE))
1681 static_key_slow_dec_deferred(&apic_hw_disabled);
1682
1683 if (!apic->sw_enabled)
1684 static_key_slow_dec_deferred(&apic_sw_disabled);
1685
1686 if (apic->regs)
1687 free_page((unsigned long)apic->regs);
1688
1689 kfree(apic);
1690 }
1691
1692 /*
1693 *----------------------------------------------------------------------
1694 * LAPIC interface
1695 *----------------------------------------------------------------------
1696 */
1697
1698 u64 kvm_get_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu)
1699 {
1700 struct kvm_lapic *apic = vcpu->arch.apic;
1701
1702 if (!lapic_in_kernel(vcpu) || apic_lvtt_oneshot(apic) ||
1703 apic_lvtt_period(apic))
1704 return 0;
1705
1706 return apic->lapic_timer.tscdeadline;
1707 }
1708
1709 void kvm_set_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu, u64 data)
1710 {
1711 struct kvm_lapic *apic = vcpu->arch.apic;
1712
1713 if (!lapic_in_kernel(vcpu) || apic_lvtt_oneshot(apic) ||
1714 apic_lvtt_period(apic))
1715 return;
1716
1717 hrtimer_cancel(&apic->lapic_timer.timer);
1718 apic->lapic_timer.tscdeadline = data;
1719 start_apic_timer(apic);
1720 }
1721
1722 void kvm_lapic_set_tpr(struct kvm_vcpu *vcpu, unsigned long cr8)
1723 {
1724 struct kvm_lapic *apic = vcpu->arch.apic;
1725
1726 apic_set_tpr(apic, ((cr8 & 0x0f) << 4)
1727 | (kvm_lapic_get_reg(apic, APIC_TASKPRI) & 4));
1728 }
1729
1730 u64 kvm_lapic_get_cr8(struct kvm_vcpu *vcpu)
1731 {
1732 u64 tpr;
1733
1734 tpr = (u64) kvm_lapic_get_reg(vcpu->arch.apic, APIC_TASKPRI);
1735
1736 return (tpr & 0xf0) >> 4;
1737 }
1738
1739 void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value)
1740 {
1741 u64 old_value = vcpu->arch.apic_base;
1742 struct kvm_lapic *apic = vcpu->arch.apic;
1743
1744 if (!apic) {
1745 value |= MSR_IA32_APICBASE_BSP;
1746 vcpu->arch.apic_base = value;
1747 return;
1748 }
1749
1750 vcpu->arch.apic_base = value;
1751
1752 /* update jump label if enable bit changes */
1753 if ((old_value ^ value) & MSR_IA32_APICBASE_ENABLE) {
1754 if (value & MSR_IA32_APICBASE_ENABLE)
1755 static_key_slow_dec_deferred(&apic_hw_disabled);
1756 else
1757 static_key_slow_inc(&apic_hw_disabled.key);
1758 recalculate_apic_map(vcpu->kvm);
1759 }
1760
1761 if ((old_value ^ value) & X2APIC_ENABLE) {
1762 if (value & X2APIC_ENABLE) {
1763 kvm_apic_set_x2apic_id(apic, vcpu->vcpu_id);
1764 kvm_x86_ops->set_virtual_x2apic_mode(vcpu, true);
1765 } else
1766 kvm_x86_ops->set_virtual_x2apic_mode(vcpu, false);
1767 }
1768
1769 apic->base_address = apic->vcpu->arch.apic_base &
1770 MSR_IA32_APICBASE_BASE;
1771
1772 if ((value & MSR_IA32_APICBASE_ENABLE) &&
1773 apic->base_address != APIC_DEFAULT_PHYS_BASE)
1774 pr_warn_once("APIC base relocation is unsupported by KVM");
1775
1776 /* with FSB delivery interrupt, we can restart APIC functionality */
1777 apic_debug("apic base msr is 0x%016" PRIx64 ", and base address is "
1778 "0x%lx.\n", apic->vcpu->arch.apic_base, apic->base_address);
1779
1780 }
1781
1782 void kvm_lapic_reset(struct kvm_vcpu *vcpu, bool init_event)
1783 {
1784 struct kvm_lapic *apic;
1785 int i;
1786
1787 apic_debug("%s\n", __func__);
1788
1789 ASSERT(vcpu);
1790 apic = vcpu->arch.apic;
1791 ASSERT(apic != NULL);
1792
1793 /* Stop the timer in case it's a reset to an active apic */
1794 hrtimer_cancel(&apic->lapic_timer.timer);
1795
1796 if (!init_event)
1797 kvm_apic_set_id(apic, vcpu->vcpu_id);
1798 kvm_apic_set_version(apic->vcpu);
1799
1800 for (i = 0; i < KVM_APIC_LVT_NUM; i++)
1801 kvm_lapic_set_reg(apic, APIC_LVTT + 0x10 * i, APIC_LVT_MASKED);
1802 apic_update_lvtt(apic);
1803 if (kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_LINT0_REENABLED))
1804 kvm_lapic_set_reg(apic, APIC_LVT0,
1805 SET_APIC_DELIVERY_MODE(0, APIC_MODE_EXTINT));
1806 apic_manage_nmi_watchdog(apic, kvm_lapic_get_reg(apic, APIC_LVT0));
1807
1808 kvm_lapic_set_reg(apic, APIC_DFR, 0xffffffffU);
1809 apic_set_spiv(apic, 0xff);
1810 kvm_lapic_set_reg(apic, APIC_TASKPRI, 0);
1811 if (!apic_x2apic_mode(apic))
1812 kvm_apic_set_ldr(apic, 0);
1813 kvm_lapic_set_reg(apic, APIC_ESR, 0);
1814 kvm_lapic_set_reg(apic, APIC_ICR, 0);
1815 kvm_lapic_set_reg(apic, APIC_ICR2, 0);
1816 kvm_lapic_set_reg(apic, APIC_TDCR, 0);
1817 kvm_lapic_set_reg(apic, APIC_TMICT, 0);
1818 for (i = 0; i < 8; i++) {
1819 kvm_lapic_set_reg(apic, APIC_IRR + 0x10 * i, 0);
1820 kvm_lapic_set_reg(apic, APIC_ISR + 0x10 * i, 0);
1821 kvm_lapic_set_reg(apic, APIC_TMR + 0x10 * i, 0);
1822 }
1823 apic->irr_pending = vcpu->arch.apicv_active;
1824 apic->isr_count = vcpu->arch.apicv_active ? 1 : 0;
1825 apic->highest_isr_cache = -1;
1826 update_divide_count(apic);
1827 atomic_set(&apic->lapic_timer.pending, 0);
1828 if (kvm_vcpu_is_bsp(vcpu))
1829 kvm_lapic_set_base(vcpu,
1830 vcpu->arch.apic_base | MSR_IA32_APICBASE_BSP);
1831 vcpu->arch.pv_eoi.msr_val = 0;
1832 apic_update_ppr(apic);
1833
1834 vcpu->arch.apic_arb_prio = 0;
1835 vcpu->arch.apic_attention = 0;
1836
1837 apic_debug("%s: vcpu=%p, id=%d, base_msr="
1838 "0x%016" PRIx64 ", base_address=0x%0lx.\n", __func__,
1839 vcpu, kvm_apic_id(apic),
1840 vcpu->arch.apic_base, apic->base_address);
1841 }
1842
1843 /*
1844 *----------------------------------------------------------------------
1845 * timer interface
1846 *----------------------------------------------------------------------
1847 */
1848
1849 static bool lapic_is_periodic(struct kvm_lapic *apic)
1850 {
1851 return apic_lvtt_period(apic);
1852 }
1853
1854 int apic_has_pending_timer(struct kvm_vcpu *vcpu)
1855 {
1856 struct kvm_lapic *apic = vcpu->arch.apic;
1857
1858 if (apic_enabled(apic) && apic_lvt_enabled(apic, APIC_LVTT))
1859 return atomic_read(&apic->lapic_timer.pending);
1860
1861 return 0;
1862 }
1863
1864 int kvm_apic_local_deliver(struct kvm_lapic *apic, int lvt_type)
1865 {
1866 u32 reg = kvm_lapic_get_reg(apic, lvt_type);
1867 int vector, mode, trig_mode;
1868
1869 if (kvm_apic_hw_enabled(apic) && !(reg & APIC_LVT_MASKED)) {
1870 vector = reg & APIC_VECTOR_MASK;
1871 mode = reg & APIC_MODE_MASK;
1872 trig_mode = reg & APIC_LVT_LEVEL_TRIGGER;
1873 return __apic_accept_irq(apic, mode, vector, 1, trig_mode,
1874 NULL);
1875 }
1876 return 0;
1877 }
1878
1879 void kvm_apic_nmi_wd_deliver(struct kvm_vcpu *vcpu)
1880 {
1881 struct kvm_lapic *apic = vcpu->arch.apic;
1882
1883 if (apic)
1884 kvm_apic_local_deliver(apic, APIC_LVT0);
1885 }
1886
1887 static const struct kvm_io_device_ops apic_mmio_ops = {
1888 .read = apic_mmio_read,
1889 .write = apic_mmio_write,
1890 };
1891
1892 static enum hrtimer_restart apic_timer_fn(struct hrtimer *data)
1893 {
1894 struct kvm_timer *ktimer = container_of(data, struct kvm_timer, timer);
1895 struct kvm_lapic *apic = container_of(ktimer, struct kvm_lapic, lapic_timer);
1896
1897 apic_timer_expired(apic);
1898
1899 if (lapic_is_periodic(apic)) {
1900 hrtimer_add_expires_ns(&ktimer->timer, ktimer->period);
1901 return HRTIMER_RESTART;
1902 } else
1903 return HRTIMER_NORESTART;
1904 }
1905
1906 int kvm_create_lapic(struct kvm_vcpu *vcpu)
1907 {
1908 struct kvm_lapic *apic;
1909
1910 ASSERT(vcpu != NULL);
1911 apic_debug("apic_init %d\n", vcpu->vcpu_id);
1912
1913 apic = kzalloc(sizeof(*apic), GFP_KERNEL);
1914 if (!apic)
1915 goto nomem;
1916
1917 vcpu->arch.apic = apic;
1918
1919 apic->regs = (void *)get_zeroed_page(GFP_KERNEL);
1920 if (!apic->regs) {
1921 printk(KERN_ERR "malloc apic regs error for vcpu %x\n",
1922 vcpu->vcpu_id);
1923 goto nomem_free_apic;
1924 }
1925 apic->vcpu = vcpu;
1926
1927 hrtimer_init(&apic->lapic_timer.timer, CLOCK_MONOTONIC,
1928 HRTIMER_MODE_ABS_PINNED);
1929 apic->lapic_timer.timer.function = apic_timer_fn;
1930
1931 /*
1932 * APIC is created enabled. This will prevent kvm_lapic_set_base from
1933 * thinking that APIC satet has changed.
1934 */
1935 vcpu->arch.apic_base = MSR_IA32_APICBASE_ENABLE;
1936 kvm_lapic_set_base(vcpu,
1937 APIC_DEFAULT_PHYS_BASE | MSR_IA32_APICBASE_ENABLE);
1938
1939 static_key_slow_inc(&apic_sw_disabled.key); /* sw disabled at reset */
1940 kvm_lapic_reset(vcpu, false);
1941 kvm_iodevice_init(&apic->dev, &apic_mmio_ops);
1942
1943 return 0;
1944 nomem_free_apic:
1945 kfree(apic);
1946 nomem:
1947 return -ENOMEM;
1948 }
1949
1950 int kvm_apic_has_interrupt(struct kvm_vcpu *vcpu)
1951 {
1952 struct kvm_lapic *apic = vcpu->arch.apic;
1953 int highest_irr;
1954
1955 if (!apic_enabled(apic))
1956 return -1;
1957
1958 apic_update_ppr(apic);
1959 highest_irr = apic_find_highest_irr(apic);
1960 if ((highest_irr == -1) ||
1961 ((highest_irr & 0xF0) <= kvm_lapic_get_reg(apic, APIC_PROCPRI)))
1962 return -1;
1963 return highest_irr;
1964 }
1965
1966 int kvm_apic_accept_pic_intr(struct kvm_vcpu *vcpu)
1967 {
1968 u32 lvt0 = kvm_lapic_get_reg(vcpu->arch.apic, APIC_LVT0);
1969 int r = 0;
1970
1971 if (!kvm_apic_hw_enabled(vcpu->arch.apic))
1972 r = 1;
1973 if ((lvt0 & APIC_LVT_MASKED) == 0 &&
1974 GET_APIC_DELIVERY_MODE(lvt0) == APIC_MODE_EXTINT)
1975 r = 1;
1976 return r;
1977 }
1978
1979 void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu)
1980 {
1981 struct kvm_lapic *apic = vcpu->arch.apic;
1982
1983 if (atomic_read(&apic->lapic_timer.pending) > 0) {
1984 kvm_apic_local_deliver(apic, APIC_LVTT);
1985 if (apic_lvtt_tscdeadline(apic))
1986 apic->lapic_timer.tscdeadline = 0;
1987 atomic_set(&apic->lapic_timer.pending, 0);
1988 }
1989 }
1990
1991 int kvm_get_apic_interrupt(struct kvm_vcpu *vcpu)
1992 {
1993 int vector = kvm_apic_has_interrupt(vcpu);
1994 struct kvm_lapic *apic = vcpu->arch.apic;
1995
1996 if (vector == -1)
1997 return -1;
1998
1999 /*
2000 * We get here even with APIC virtualization enabled, if doing
2001 * nested virtualization and L1 runs with the "acknowledge interrupt
2002 * on exit" mode. Then we cannot inject the interrupt via RVI,
2003 * because the process would deliver it through the IDT.
2004 */
2005
2006 apic_set_isr(vector, apic);
2007 apic_update_ppr(apic);
2008 apic_clear_irr(vector, apic);
2009
2010 if (test_bit(vector, vcpu_to_synic(vcpu)->auto_eoi_bitmap)) {
2011 apic_clear_isr(vector, apic);
2012 apic_update_ppr(apic);
2013 }
2014
2015 return vector;
2016 }
2017
2018 void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu,
2019 struct kvm_lapic_state *s)
2020 {
2021 struct kvm_lapic *apic = vcpu->arch.apic;
2022
2023 kvm_lapic_set_base(vcpu, vcpu->arch.apic_base);
2024 /* set SPIV separately to get count of SW disabled APICs right */
2025 apic_set_spiv(apic, *((u32 *)(s->regs + APIC_SPIV)));
2026 memcpy(vcpu->arch.apic->regs, s->regs, sizeof *s);
2027 /* call kvm_apic_set_id() to put apic into apic_map */
2028 kvm_apic_set_id(apic, kvm_apic_id(apic));
2029 kvm_apic_set_version(vcpu);
2030
2031 apic_update_ppr(apic);
2032 hrtimer_cancel(&apic->lapic_timer.timer);
2033 apic_update_lvtt(apic);
2034 apic_manage_nmi_watchdog(apic, kvm_lapic_get_reg(apic, APIC_LVT0));
2035 update_divide_count(apic);
2036 start_apic_timer(apic);
2037 apic->irr_pending = true;
2038 apic->isr_count = vcpu->arch.apicv_active ?
2039 1 : count_vectors(apic->regs + APIC_ISR);
2040 apic->highest_isr_cache = -1;
2041 if (vcpu->arch.apicv_active) {
2042 if (kvm_x86_ops->apicv_post_state_restore)
2043 kvm_x86_ops->apicv_post_state_restore(vcpu);
2044 kvm_x86_ops->hwapic_irr_update(vcpu,
2045 apic_find_highest_irr(apic));
2046 kvm_x86_ops->hwapic_isr_update(vcpu,
2047 apic_find_highest_isr(apic));
2048 }
2049 kvm_make_request(KVM_REQ_EVENT, vcpu);
2050 if (ioapic_in_kernel(vcpu->kvm))
2051 kvm_rtc_eoi_tracking_restore_one(vcpu);
2052
2053 vcpu->arch.apic_arb_prio = 0;
2054 }
2055
2056 void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu)
2057 {
2058 struct hrtimer *timer;
2059
2060 if (!lapic_in_kernel(vcpu))
2061 return;
2062
2063 timer = &vcpu->arch.apic->lapic_timer.timer;
2064 if (hrtimer_cancel(timer))
2065 hrtimer_start_expires(timer, HRTIMER_MODE_ABS_PINNED);
2066 }
2067
2068 /*
2069 * apic_sync_pv_eoi_from_guest - called on vmexit or cancel interrupt
2070 *
2071 * Detect whether guest triggered PV EOI since the
2072 * last entry. If yes, set EOI on guests's behalf.
2073 * Clear PV EOI in guest memory in any case.
2074 */
2075 static void apic_sync_pv_eoi_from_guest(struct kvm_vcpu *vcpu,
2076 struct kvm_lapic *apic)
2077 {
2078 bool pending;
2079 int vector;
2080 /*
2081 * PV EOI state is derived from KVM_APIC_PV_EOI_PENDING in host
2082 * and KVM_PV_EOI_ENABLED in guest memory as follows:
2083 *
2084 * KVM_APIC_PV_EOI_PENDING is unset:
2085 * -> host disabled PV EOI.
2086 * KVM_APIC_PV_EOI_PENDING is set, KVM_PV_EOI_ENABLED is set:
2087 * -> host enabled PV EOI, guest did not execute EOI yet.
2088 * KVM_APIC_PV_EOI_PENDING is set, KVM_PV_EOI_ENABLED is unset:
2089 * -> host enabled PV EOI, guest executed EOI.
2090 */
2091 BUG_ON(!pv_eoi_enabled(vcpu));
2092 pending = pv_eoi_get_pending(vcpu);
2093 /*
2094 * Clear pending bit in any case: it will be set again on vmentry.
2095 * While this might not be ideal from performance point of view,
2096 * this makes sure pv eoi is only enabled when we know it's safe.
2097 */
2098 pv_eoi_clr_pending(vcpu);
2099 if (pending)
2100 return;
2101 vector = apic_set_eoi(apic);
2102 trace_kvm_pv_eoi(apic, vector);
2103 }
2104
2105 void kvm_lapic_sync_from_vapic(struct kvm_vcpu *vcpu)
2106 {
2107 u32 data;
2108
2109 if (test_bit(KVM_APIC_PV_EOI_PENDING, &vcpu->arch.apic_attention))
2110 apic_sync_pv_eoi_from_guest(vcpu, vcpu->arch.apic);
2111
2112 if (!test_bit(KVM_APIC_CHECK_VAPIC, &vcpu->arch.apic_attention))
2113 return;
2114
2115 if (kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.apic->vapic_cache, &data,
2116 sizeof(u32)))
2117 return;
2118
2119 apic_set_tpr(vcpu->arch.apic, data & 0xff);
2120 }
2121
2122 /*
2123 * apic_sync_pv_eoi_to_guest - called before vmentry
2124 *
2125 * Detect whether it's safe to enable PV EOI and
2126 * if yes do so.
2127 */
2128 static void apic_sync_pv_eoi_to_guest(struct kvm_vcpu *vcpu,
2129 struct kvm_lapic *apic)
2130 {
2131 if (!pv_eoi_enabled(vcpu) ||
2132 /* IRR set or many bits in ISR: could be nested. */
2133 apic->irr_pending ||
2134 /* Cache not set: could be safe but we don't bother. */
2135 apic->highest_isr_cache == -1 ||
2136 /* Need EOI to update ioapic. */
2137 kvm_ioapic_handles_vector(apic, apic->highest_isr_cache)) {
2138 /*
2139 * PV EOI was disabled by apic_sync_pv_eoi_from_guest
2140 * so we need not do anything here.
2141 */
2142 return;
2143 }
2144
2145 pv_eoi_set_pending(apic->vcpu);
2146 }
2147
2148 void kvm_lapic_sync_to_vapic(struct kvm_vcpu *vcpu)
2149 {
2150 u32 data, tpr;
2151 int max_irr, max_isr;
2152 struct kvm_lapic *apic = vcpu->arch.apic;
2153
2154 apic_sync_pv_eoi_to_guest(vcpu, apic);
2155
2156 if (!test_bit(KVM_APIC_CHECK_VAPIC, &vcpu->arch.apic_attention))
2157 return;
2158
2159 tpr = kvm_lapic_get_reg(apic, APIC_TASKPRI) & 0xff;
2160 max_irr = apic_find_highest_irr(apic);
2161 if (max_irr < 0)
2162 max_irr = 0;
2163 max_isr = apic_find_highest_isr(apic);
2164 if (max_isr < 0)
2165 max_isr = 0;
2166 data = (tpr & 0xff) | ((max_isr & 0xf0) << 8) | (max_irr << 24);
2167
2168 kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.apic->vapic_cache, &data,
2169 sizeof(u32));
2170 }
2171
2172 int kvm_lapic_set_vapic_addr(struct kvm_vcpu *vcpu, gpa_t vapic_addr)
2173 {
2174 if (vapic_addr) {
2175 if (kvm_gfn_to_hva_cache_init(vcpu->kvm,
2176 &vcpu->arch.apic->vapic_cache,
2177 vapic_addr, sizeof(u32)))
2178 return -EINVAL;
2179 __set_bit(KVM_APIC_CHECK_VAPIC, &vcpu->arch.apic_attention);
2180 } else {
2181 __clear_bit(KVM_APIC_CHECK_VAPIC, &vcpu->arch.apic_attention);
2182 }
2183
2184 vcpu->arch.apic->vapic_addr = vapic_addr;
2185 return 0;
2186 }
2187
2188 int kvm_x2apic_msr_write(struct kvm_vcpu *vcpu, u32 msr, u64 data)
2189 {
2190 struct kvm_lapic *apic = vcpu->arch.apic;
2191 u32 reg = (msr - APIC_BASE_MSR) << 4;
2192
2193 if (!lapic_in_kernel(vcpu) || !apic_x2apic_mode(apic))
2194 return 1;
2195
2196 if (reg == APIC_ICR2)
2197 return 1;
2198
2199 /* if this is ICR write vector before command */
2200 if (reg == APIC_ICR)
2201 kvm_lapic_reg_write(apic, APIC_ICR2, (u32)(data >> 32));
2202 return kvm_lapic_reg_write(apic, reg, (u32)data);
2203 }
2204
2205 int kvm_x2apic_msr_read(struct kvm_vcpu *vcpu, u32 msr, u64 *data)
2206 {
2207 struct kvm_lapic *apic = vcpu->arch.apic;
2208 u32 reg = (msr - APIC_BASE_MSR) << 4, low, high = 0;
2209
2210 if (!lapic_in_kernel(vcpu) || !apic_x2apic_mode(apic))
2211 return 1;
2212
2213 if (reg == APIC_DFR || reg == APIC_ICR2) {
2214 apic_debug("KVM_APIC_READ: read x2apic reserved register %x\n",
2215 reg);
2216 return 1;
2217 }
2218
2219 if (kvm_lapic_reg_read(apic, reg, 4, &low))
2220 return 1;
2221 if (reg == APIC_ICR)
2222 kvm_lapic_reg_read(apic, APIC_ICR2, 4, &high);
2223
2224 *data = (((u64)high) << 32) | low;
2225
2226 return 0;
2227 }
2228
2229 int kvm_hv_vapic_msr_write(struct kvm_vcpu *vcpu, u32 reg, u64 data)
2230 {
2231 struct kvm_lapic *apic = vcpu->arch.apic;
2232
2233 if (!lapic_in_kernel(vcpu))
2234 return 1;
2235
2236 /* if this is ICR write vector before command */
2237 if (reg == APIC_ICR)
2238 kvm_lapic_reg_write(apic, APIC_ICR2, (u32)(data >> 32));
2239 return kvm_lapic_reg_write(apic, reg, (u32)data);
2240 }
2241
2242 int kvm_hv_vapic_msr_read(struct kvm_vcpu *vcpu, u32 reg, u64 *data)
2243 {
2244 struct kvm_lapic *apic = vcpu->arch.apic;
2245 u32 low, high = 0;
2246
2247 if (!lapic_in_kernel(vcpu))
2248 return 1;
2249
2250 if (kvm_lapic_reg_read(apic, reg, 4, &low))
2251 return 1;
2252 if (reg == APIC_ICR)
2253 kvm_lapic_reg_read(apic, APIC_ICR2, 4, &high);
2254
2255 *data = (((u64)high) << 32) | low;
2256
2257 return 0;
2258 }
2259
2260 int kvm_lapic_enable_pv_eoi(struct kvm_vcpu *vcpu, u64 data)
2261 {
2262 u64 addr = data & ~KVM_MSR_ENABLED;
2263 if (!IS_ALIGNED(addr, 4))
2264 return 1;
2265
2266 vcpu->arch.pv_eoi.msr_val = data;
2267 if (!pv_eoi_enabled(vcpu))
2268 return 0;
2269 return kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.pv_eoi.data,
2270 addr, sizeof(u8));
2271 }
2272
2273 void kvm_apic_accept_events(struct kvm_vcpu *vcpu)
2274 {
2275 struct kvm_lapic *apic = vcpu->arch.apic;
2276 u8 sipi_vector;
2277 unsigned long pe;
2278
2279 if (!lapic_in_kernel(vcpu) || !apic->pending_events)
2280 return;
2281
2282 /*
2283 * INITs are latched while in SMM. Because an SMM CPU cannot
2284 * be in KVM_MP_STATE_INIT_RECEIVED state, just eat SIPIs
2285 * and delay processing of INIT until the next RSM.
2286 */
2287 if (is_smm(vcpu)) {
2288 WARN_ON_ONCE(vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED);
2289 if (test_bit(KVM_APIC_SIPI, &apic->pending_events))
2290 clear_bit(KVM_APIC_SIPI, &apic->pending_events);
2291 return;
2292 }
2293
2294 pe = xchg(&apic->pending_events, 0);
2295 if (test_bit(KVM_APIC_INIT, &pe)) {
2296 kvm_lapic_reset(vcpu, true);
2297 kvm_vcpu_reset(vcpu, true);
2298 if (kvm_vcpu_is_bsp(apic->vcpu))
2299 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
2300 else
2301 vcpu->arch.mp_state = KVM_MP_STATE_INIT_RECEIVED;
2302 }
2303 if (test_bit(KVM_APIC_SIPI, &pe) &&
2304 vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) {
2305 /* evaluate pending_events before reading the vector */
2306 smp_rmb();
2307 sipi_vector = apic->sipi_vector;
2308 apic_debug("vcpu %d received sipi with vector # %x\n",
2309 vcpu->vcpu_id, sipi_vector);
2310 kvm_vcpu_deliver_sipi_vector(vcpu, sipi_vector);
2311 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
2312 }
2313 }
2314
2315 void kvm_lapic_init(void)
2316 {
2317 /* do not patch jump label more than once per second */
2318 jump_label_rate_limit(&apic_hw_disabled, HZ);
2319 jump_label_rate_limit(&apic_sw_disabled, HZ);
2320 }
Linux kernel - Deliverables
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