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Merge commit 'ftrace/function-graph' into next
[deliverable/linux.git] / arch / x86 / kvm / lapic.c
1
2 /*
3 * Local APIC virtualization
4 *
5 * Copyright (C) 2006 Qumranet, Inc.
6 * Copyright (C) 2007 Novell
7 * Copyright (C) 2007 Intel
8 *
9 * Authors:
10 * Dor Laor <dor.laor@qumranet.com>
11 * Gregory Haskins <ghaskins@novell.com>
12 * Yaozu (Eddie) Dong <eddie.dong@intel.com>
13 *
14 * Based on Xen 3.1 code, Copyright (c) 2004, Intel Corporation.
15 *
16 * This work is licensed under the terms of the GNU GPL, version 2. See
17 * the COPYING file in the top-level directory.
18 */
19
20 #include <linux/kvm_host.h>
21 #include <linux/kvm.h>
22 #include <linux/mm.h>
23 #include <linux/highmem.h>
24 #include <linux/smp.h>
25 #include <linux/hrtimer.h>
26 #include <linux/io.h>
27 #include <linux/module.h>
28 #include <linux/math64.h>
29 #include <asm/processor.h>
30 #include <asm/msr.h>
31 #include <asm/page.h>
32 #include <asm/current.h>
33 #include <asm/apicdef.h>
34 #include <asm/atomic.h>
35 #include "kvm_cache_regs.h"
36 #include "irq.h"
37
38 #ifndef CONFIG_X86_64
39 #define mod_64(x, y) ((x) - (y) * div64_u64(x, y))
40 #else
41 #define mod_64(x, y) ((x) % (y))
42 #endif
43
44 #define PRId64 "d"
45 #define PRIx64 "llx"
46 #define PRIu64 "u"
47 #define PRIo64 "o"
48
49 #define APIC_BUS_CYCLE_NS 1
50
51 /* #define apic_debug(fmt,arg...) printk(KERN_WARNING fmt,##arg) */
52 #define apic_debug(fmt, arg...)
53
54 #define APIC_LVT_NUM 6
55 /* 14 is the version for Xeon and Pentium 8.4.8*/
56 #define APIC_VERSION (0x14UL | ((APIC_LVT_NUM - 1) << 16))
57 #define LAPIC_MMIO_LENGTH (1 << 12)
58 /* followed define is not in apicdef.h */
59 #define APIC_SHORT_MASK 0xc0000
60 #define APIC_DEST_NOSHORT 0x0
61 #define APIC_DEST_MASK 0x800
62 #define MAX_APIC_VECTOR 256
63
64 #define VEC_POS(v) ((v) & (32 - 1))
65 #define REG_POS(v) (((v) >> 5) << 4)
66
67 static inline u32 apic_get_reg(struct kvm_lapic *apic, int reg_off)
68 {
69 return *((u32 *) (apic->regs + reg_off));
70 }
71
72 static inline void apic_set_reg(struct kvm_lapic *apic, int reg_off, u32 val)
73 {
74 *((u32 *) (apic->regs + reg_off)) = val;
75 }
76
77 static inline int apic_test_and_set_vector(int vec, void *bitmap)
78 {
79 return test_and_set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
80 }
81
82 static inline int apic_test_and_clear_vector(int vec, void *bitmap)
83 {
84 return test_and_clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
85 }
86
87 static inline void apic_set_vector(int vec, void *bitmap)
88 {
89 set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
90 }
91
92 static inline void apic_clear_vector(int vec, void *bitmap)
93 {
94 clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
95 }
96
97 static inline int apic_hw_enabled(struct kvm_lapic *apic)
98 {
99 return (apic)->vcpu->arch.apic_base & MSR_IA32_APICBASE_ENABLE;
100 }
101
102 static inline int apic_sw_enabled(struct kvm_lapic *apic)
103 {
104 return apic_get_reg(apic, APIC_SPIV) & APIC_SPIV_APIC_ENABLED;
105 }
106
107 static inline int apic_enabled(struct kvm_lapic *apic)
108 {
109 return apic_sw_enabled(apic) && apic_hw_enabled(apic);
110 }
111
112 #define LVT_MASK \
113 (APIC_LVT_MASKED | APIC_SEND_PENDING | APIC_VECTOR_MASK)
114
115 #define LINT_MASK \
116 (LVT_MASK | APIC_MODE_MASK | APIC_INPUT_POLARITY | \
117 APIC_LVT_REMOTE_IRR | APIC_LVT_LEVEL_TRIGGER)
118
119 static inline int kvm_apic_id(struct kvm_lapic *apic)
120 {
121 return (apic_get_reg(apic, APIC_ID) >> 24) & 0xff;
122 }
123
124 static inline int apic_lvt_enabled(struct kvm_lapic *apic, int lvt_type)
125 {
126 return !(apic_get_reg(apic, lvt_type) & APIC_LVT_MASKED);
127 }
128
129 static inline int apic_lvt_vector(struct kvm_lapic *apic, int lvt_type)
130 {
131 return apic_get_reg(apic, lvt_type) & APIC_VECTOR_MASK;
132 }
133
134 static inline int apic_lvtt_period(struct kvm_lapic *apic)
135 {
136 return apic_get_reg(apic, APIC_LVTT) & APIC_LVT_TIMER_PERIODIC;
137 }
138
139 static inline int apic_lvt_nmi_mode(u32 lvt_val)
140 {
141 return (lvt_val & (APIC_MODE_MASK | APIC_LVT_MASKED)) == APIC_DM_NMI;
142 }
143
144 static unsigned int apic_lvt_mask[APIC_LVT_NUM] = {
145 LVT_MASK | APIC_LVT_TIMER_PERIODIC, /* LVTT */
146 LVT_MASK | APIC_MODE_MASK, /* LVTTHMR */
147 LVT_MASK | APIC_MODE_MASK, /* LVTPC */
148 LINT_MASK, LINT_MASK, /* LVT0-1 */
149 LVT_MASK /* LVTERR */
150 };
151
152 static int find_highest_vector(void *bitmap)
153 {
154 u32 *word = bitmap;
155 int word_offset = MAX_APIC_VECTOR >> 5;
156
157 while ((word_offset != 0) && (word[(--word_offset) << 2] == 0))
158 continue;
159
160 if (likely(!word_offset && !word[0]))
161 return -1;
162 else
163 return fls(word[word_offset << 2]) - 1 + (word_offset << 5);
164 }
165
166 static inline int apic_test_and_set_irr(int vec, struct kvm_lapic *apic)
167 {
168 return apic_test_and_set_vector(vec, apic->regs + APIC_IRR);
169 }
170
171 static inline void apic_clear_irr(int vec, struct kvm_lapic *apic)
172 {
173 apic_clear_vector(vec, apic->regs + APIC_IRR);
174 }
175
176 static inline int apic_find_highest_irr(struct kvm_lapic *apic)
177 {
178 int result;
179
180 result = find_highest_vector(apic->regs + APIC_IRR);
181 ASSERT(result == -1 || result >= 16);
182
183 return result;
184 }
185
186 int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu)
187 {
188 struct kvm_lapic *apic = vcpu->arch.apic;
189 int highest_irr;
190
191 if (!apic)
192 return 0;
193 highest_irr = apic_find_highest_irr(apic);
194
195 return highest_irr;
196 }
197 EXPORT_SYMBOL_GPL(kvm_lapic_find_highest_irr);
198
199 int kvm_apic_set_irq(struct kvm_vcpu *vcpu, u8 vec, u8 trig)
200 {
201 struct kvm_lapic *apic = vcpu->arch.apic;
202
203 if (!apic_test_and_set_irr(vec, apic)) {
204 /* a new pending irq is set in IRR */
205 if (trig)
206 apic_set_vector(vec, apic->regs + APIC_TMR);
207 else
208 apic_clear_vector(vec, apic->regs + APIC_TMR);
209 kvm_vcpu_kick(apic->vcpu);
210 return 1;
211 }
212 return 0;
213 }
214
215 static inline int apic_find_highest_isr(struct kvm_lapic *apic)
216 {
217 int result;
218
219 result = find_highest_vector(apic->regs + APIC_ISR);
220 ASSERT(result == -1 || result >= 16);
221
222 return result;
223 }
224
225 static void apic_update_ppr(struct kvm_lapic *apic)
226 {
227 u32 tpr, isrv, ppr;
228 int isr;
229
230 tpr = apic_get_reg(apic, APIC_TASKPRI);
231 isr = apic_find_highest_isr(apic);
232 isrv = (isr != -1) ? isr : 0;
233
234 if ((tpr & 0xf0) >= (isrv & 0xf0))
235 ppr = tpr & 0xff;
236 else
237 ppr = isrv & 0xf0;
238
239 apic_debug("vlapic %p, ppr 0x%x, isr 0x%x, isrv 0x%x",
240 apic, ppr, isr, isrv);
241
242 apic_set_reg(apic, APIC_PROCPRI, ppr);
243 }
244
245 static void apic_set_tpr(struct kvm_lapic *apic, u32 tpr)
246 {
247 apic_set_reg(apic, APIC_TASKPRI, tpr);
248 apic_update_ppr(apic);
249 }
250
251 int kvm_apic_match_physical_addr(struct kvm_lapic *apic, u16 dest)
252 {
253 return kvm_apic_id(apic) == dest;
254 }
255
256 int kvm_apic_match_logical_addr(struct kvm_lapic *apic, u8 mda)
257 {
258 int result = 0;
259 u8 logical_id;
260
261 logical_id = GET_APIC_LOGICAL_ID(apic_get_reg(apic, APIC_LDR));
262
263 switch (apic_get_reg(apic, APIC_DFR)) {
264 case APIC_DFR_FLAT:
265 if (logical_id & mda)
266 result = 1;
267 break;
268 case APIC_DFR_CLUSTER:
269 if (((logical_id >> 4) == (mda >> 0x4))
270 && (logical_id & mda & 0xf))
271 result = 1;
272 break;
273 default:
274 printk(KERN_WARNING "Bad DFR vcpu %d: %08x\n",
275 apic->vcpu->vcpu_id, apic_get_reg(apic, APIC_DFR));
276 break;
277 }
278
279 return result;
280 }
281
282 static int apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
283 int short_hand, int dest, int dest_mode)
284 {
285 int result = 0;
286 struct kvm_lapic *target = vcpu->arch.apic;
287
288 apic_debug("target %p, source %p, dest 0x%x, "
289 "dest_mode 0x%x, short_hand 0x%x",
290 target, source, dest, dest_mode, short_hand);
291
292 ASSERT(!target);
293 switch (short_hand) {
294 case APIC_DEST_NOSHORT:
295 if (dest_mode == 0) {
296 /* Physical mode. */
297 if ((dest == 0xFF) || (dest == kvm_apic_id(target)))
298 result = 1;
299 } else
300 /* Logical mode. */
301 result = kvm_apic_match_logical_addr(target, dest);
302 break;
303 case APIC_DEST_SELF:
304 if (target == source)
305 result = 1;
306 break;
307 case APIC_DEST_ALLINC:
308 result = 1;
309 break;
310 case APIC_DEST_ALLBUT:
311 if (target != source)
312 result = 1;
313 break;
314 default:
315 printk(KERN_WARNING "Bad dest shorthand value %x\n",
316 short_hand);
317 break;
318 }
319
320 return result;
321 }
322
323 /*
324 * Add a pending IRQ into lapic.
325 * Return 1 if successfully added and 0 if discarded.
326 */
327 static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
328 int vector, int level, int trig_mode)
329 {
330 int orig_irr, result = 0;
331 struct kvm_vcpu *vcpu = apic->vcpu;
332
333 switch (delivery_mode) {
334 case APIC_DM_FIXED:
335 case APIC_DM_LOWEST:
336 /* FIXME add logic for vcpu on reset */
337 if (unlikely(!apic_enabled(apic)))
338 break;
339
340 orig_irr = apic_test_and_set_irr(vector, apic);
341 if (orig_irr && trig_mode) {
342 apic_debug("level trig mode repeatedly for vector %d",
343 vector);
344 break;
345 }
346
347 if (trig_mode) {
348 apic_debug("level trig mode for vector %d", vector);
349 apic_set_vector(vector, apic->regs + APIC_TMR);
350 } else
351 apic_clear_vector(vector, apic->regs + APIC_TMR);
352
353 kvm_vcpu_kick(vcpu);
354
355 result = (orig_irr == 0);
356 break;
357
358 case APIC_DM_REMRD:
359 printk(KERN_DEBUG "Ignoring delivery mode 3\n");
360 break;
361
362 case APIC_DM_SMI:
363 printk(KERN_DEBUG "Ignoring guest SMI\n");
364 break;
365
366 case APIC_DM_NMI:
367 kvm_inject_nmi(vcpu);
368 kvm_vcpu_kick(vcpu);
369 break;
370
371 case APIC_DM_INIT:
372 if (level) {
373 if (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE)
374 printk(KERN_DEBUG
375 "INIT on a runnable vcpu %d\n",
376 vcpu->vcpu_id);
377 vcpu->arch.mp_state = KVM_MP_STATE_INIT_RECEIVED;
378 kvm_vcpu_kick(vcpu);
379 } else {
380 apic_debug("Ignoring de-assert INIT to vcpu %d\n",
381 vcpu->vcpu_id);
382 }
383 break;
384
385 case APIC_DM_STARTUP:
386 apic_debug("SIPI to vcpu %d vector 0x%02x\n",
387 vcpu->vcpu_id, vector);
388 if (vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) {
389 vcpu->arch.sipi_vector = vector;
390 vcpu->arch.mp_state = KVM_MP_STATE_SIPI_RECEIVED;
391 kvm_vcpu_kick(vcpu);
392 }
393 break;
394
395 case APIC_DM_EXTINT:
396 /*
397 * Should only be called by kvm_apic_local_deliver() with LVT0,
398 * before NMI watchdog was enabled. Already handled by
399 * kvm_apic_accept_pic_intr().
400 */
401 break;
402
403 default:
404 printk(KERN_ERR "TODO: unsupported delivery mode %x\n",
405 delivery_mode);
406 break;
407 }
408 return result;
409 }
410
411 static struct kvm_lapic *kvm_apic_round_robin(struct kvm *kvm, u8 vector,
412 unsigned long bitmap)
413 {
414 int last;
415 int next;
416 struct kvm_lapic *apic = NULL;
417
418 last = kvm->arch.round_robin_prev_vcpu;
419 next = last;
420
421 do {
422 if (++next == KVM_MAX_VCPUS)
423 next = 0;
424 if (kvm->vcpus[next] == NULL || !test_bit(next, &bitmap))
425 continue;
426 apic = kvm->vcpus[next]->arch.apic;
427 if (apic && apic_enabled(apic))
428 break;
429 apic = NULL;
430 } while (next != last);
431 kvm->arch.round_robin_prev_vcpu = next;
432
433 if (!apic)
434 printk(KERN_DEBUG "vcpu not ready for apic_round_robin\n");
435
436 return apic;
437 }
438
439 struct kvm_vcpu *kvm_get_lowest_prio_vcpu(struct kvm *kvm, u8 vector,
440 unsigned long bitmap)
441 {
442 struct kvm_lapic *apic;
443
444 apic = kvm_apic_round_robin(kvm, vector, bitmap);
445 if (apic)
446 return apic->vcpu;
447 return NULL;
448 }
449
450 static void apic_set_eoi(struct kvm_lapic *apic)
451 {
452 int vector = apic_find_highest_isr(apic);
453 int trigger_mode;
454 /*
455 * Not every write EOI will has corresponding ISR,
456 * one example is when Kernel check timer on setup_IO_APIC
457 */
458 if (vector == -1)
459 return;
460
461 apic_clear_vector(vector, apic->regs + APIC_ISR);
462 apic_update_ppr(apic);
463
464 if (apic_test_and_clear_vector(vector, apic->regs + APIC_TMR))
465 trigger_mode = IOAPIC_LEVEL_TRIG;
466 else
467 trigger_mode = IOAPIC_EDGE_TRIG;
468 kvm_ioapic_update_eoi(apic->vcpu->kvm, vector, trigger_mode);
469 }
470
471 static void apic_send_ipi(struct kvm_lapic *apic)
472 {
473 u32 icr_low = apic_get_reg(apic, APIC_ICR);
474 u32 icr_high = apic_get_reg(apic, APIC_ICR2);
475
476 unsigned int dest = GET_APIC_DEST_FIELD(icr_high);
477 unsigned int short_hand = icr_low & APIC_SHORT_MASK;
478 unsigned int trig_mode = icr_low & APIC_INT_LEVELTRIG;
479 unsigned int level = icr_low & APIC_INT_ASSERT;
480 unsigned int dest_mode = icr_low & APIC_DEST_MASK;
481 unsigned int delivery_mode = icr_low & APIC_MODE_MASK;
482 unsigned int vector = icr_low & APIC_VECTOR_MASK;
483
484 struct kvm_vcpu *target;
485 struct kvm_vcpu *vcpu;
486 unsigned long lpr_map = 0;
487 int i;
488
489 apic_debug("icr_high 0x%x, icr_low 0x%x, "
490 "short_hand 0x%x, dest 0x%x, trig_mode 0x%x, level 0x%x, "
491 "dest_mode 0x%x, delivery_mode 0x%x, vector 0x%x\n",
492 icr_high, icr_low, short_hand, dest,
493 trig_mode, level, dest_mode, delivery_mode, vector);
494
495 for (i = 0; i < KVM_MAX_VCPUS; i++) {
496 vcpu = apic->vcpu->kvm->vcpus[i];
497 if (!vcpu)
498 continue;
499
500 if (vcpu->arch.apic &&
501 apic_match_dest(vcpu, apic, short_hand, dest, dest_mode)) {
502 if (delivery_mode == APIC_DM_LOWEST)
503 set_bit(vcpu->vcpu_id, &lpr_map);
504 else
505 __apic_accept_irq(vcpu->arch.apic, delivery_mode,
506 vector, level, trig_mode);
507 }
508 }
509
510 if (delivery_mode == APIC_DM_LOWEST) {
511 target = kvm_get_lowest_prio_vcpu(vcpu->kvm, vector, lpr_map);
512 if (target != NULL)
513 __apic_accept_irq(target->arch.apic, delivery_mode,
514 vector, level, trig_mode);
515 }
516 }
517
518 static u32 apic_get_tmcct(struct kvm_lapic *apic)
519 {
520 ktime_t remaining;
521 s64 ns;
522 u32 tmcct;
523
524 ASSERT(apic != NULL);
525
526 /* if initial count is 0, current count should also be 0 */
527 if (apic_get_reg(apic, APIC_TMICT) == 0)
528 return 0;
529
530 remaining = hrtimer_expires_remaining(&apic->timer.dev);
531 if (ktime_to_ns(remaining) < 0)
532 remaining = ktime_set(0, 0);
533
534 ns = mod_64(ktime_to_ns(remaining), apic->timer.period);
535 tmcct = div64_u64(ns, (APIC_BUS_CYCLE_NS * apic->timer.divide_count));
536
537 return tmcct;
538 }
539
540 static void __report_tpr_access(struct kvm_lapic *apic, bool write)
541 {
542 struct kvm_vcpu *vcpu = apic->vcpu;
543 struct kvm_run *run = vcpu->run;
544
545 set_bit(KVM_REQ_REPORT_TPR_ACCESS, &vcpu->requests);
546 run->tpr_access.rip = kvm_rip_read(vcpu);
547 run->tpr_access.is_write = write;
548 }
549
550 static inline void report_tpr_access(struct kvm_lapic *apic, bool write)
551 {
552 if (apic->vcpu->arch.tpr_access_reporting)
553 __report_tpr_access(apic, write);
554 }
555
556 static u32 __apic_read(struct kvm_lapic *apic, unsigned int offset)
557 {
558 u32 val = 0;
559
560 KVMTRACE_1D(APIC_ACCESS, apic->vcpu, (u32)offset, handler);
561
562 if (offset >= LAPIC_MMIO_LENGTH)
563 return 0;
564
565 switch (offset) {
566 case APIC_ARBPRI:
567 printk(KERN_WARNING "Access APIC ARBPRI register "
568 "which is for P6\n");
569 break;
570
571 case APIC_TMCCT: /* Timer CCR */
572 val = apic_get_tmcct(apic);
573 break;
574
575 case APIC_TASKPRI:
576 report_tpr_access(apic, false);
577 /* fall thru */
578 default:
579 apic_update_ppr(apic);
580 val = apic_get_reg(apic, offset);
581 break;
582 }
583
584 return val;
585 }
586
587 static void apic_mmio_read(struct kvm_io_device *this,
588 gpa_t address, int len, void *data)
589 {
590 struct kvm_lapic *apic = (struct kvm_lapic *)this->private;
591 unsigned int offset = address - apic->base_address;
592 unsigned char alignment = offset & 0xf;
593 u32 result;
594
595 if ((alignment + len) > 4) {
596 printk(KERN_ERR "KVM_APIC_READ: alignment error %lx %d",
597 (unsigned long)address, len);
598 return;
599 }
600 result = __apic_read(apic, offset & ~0xf);
601
602 switch (len) {
603 case 1:
604 case 2:
605 case 4:
606 memcpy(data, (char *)&result + alignment, len);
607 break;
608 default:
609 printk(KERN_ERR "Local APIC read with len = %x, "
610 "should be 1,2, or 4 instead\n", len);
611 break;
612 }
613 }
614
615 static void update_divide_count(struct kvm_lapic *apic)
616 {
617 u32 tmp1, tmp2, tdcr;
618
619 tdcr = apic_get_reg(apic, APIC_TDCR);
620 tmp1 = tdcr & 0xf;
621 tmp2 = ((tmp1 & 0x3) | ((tmp1 & 0x8) >> 1)) + 1;
622 apic->timer.divide_count = 0x1 << (tmp2 & 0x7);
623
624 apic_debug("timer divide count is 0x%x\n",
625 apic->timer.divide_count);
626 }
627
628 static void start_apic_timer(struct kvm_lapic *apic)
629 {
630 ktime_t now = apic->timer.dev.base->get_time();
631
632 apic->timer.period = apic_get_reg(apic, APIC_TMICT) *
633 APIC_BUS_CYCLE_NS * apic->timer.divide_count;
634 atomic_set(&apic->timer.pending, 0);
635
636 if (!apic->timer.period)
637 return;
638
639 hrtimer_start(&apic->timer.dev,
640 ktime_add_ns(now, apic->timer.period),
641 HRTIMER_MODE_ABS);
642
643 apic_debug("%s: bus cycle is %" PRId64 "ns, now 0x%016"
644 PRIx64 ", "
645 "timer initial count 0x%x, period %lldns, "
646 "expire @ 0x%016" PRIx64 ".\n", __func__,
647 APIC_BUS_CYCLE_NS, ktime_to_ns(now),
648 apic_get_reg(apic, APIC_TMICT),
649 apic->timer.period,
650 ktime_to_ns(ktime_add_ns(now,
651 apic->timer.period)));
652 }
653
654 static void apic_manage_nmi_watchdog(struct kvm_lapic *apic, u32 lvt0_val)
655 {
656 int nmi_wd_enabled = apic_lvt_nmi_mode(apic_get_reg(apic, APIC_LVT0));
657
658 if (apic_lvt_nmi_mode(lvt0_val)) {
659 if (!nmi_wd_enabled) {
660 apic_debug("Receive NMI setting on APIC_LVT0 "
661 "for cpu %d\n", apic->vcpu->vcpu_id);
662 apic->vcpu->kvm->arch.vapics_in_nmi_mode++;
663 }
664 } else if (nmi_wd_enabled)
665 apic->vcpu->kvm->arch.vapics_in_nmi_mode--;
666 }
667
668 static void apic_mmio_write(struct kvm_io_device *this,
669 gpa_t address, int len, const void *data)
670 {
671 struct kvm_lapic *apic = (struct kvm_lapic *)this->private;
672 unsigned int offset = address - apic->base_address;
673 unsigned char alignment = offset & 0xf;
674 u32 val;
675
676 /*
677 * APIC register must be aligned on 128-bits boundary.
678 * 32/64/128 bits registers must be accessed thru 32 bits.
679 * Refer SDM 8.4.1
680 */
681 if (len != 4 || alignment) {
682 /* Don't shout loud, $infamous_os would cause only noise. */
683 apic_debug("apic write: bad size=%d %lx\n",
684 len, (long)address);
685 return;
686 }
687
688 val = *(u32 *) data;
689
690 /* too common printing */
691 if (offset != APIC_EOI)
692 apic_debug("%s: offset 0x%x with length 0x%x, and value is "
693 "0x%x\n", __func__, offset, len, val);
694
695 offset &= 0xff0;
696
697 KVMTRACE_1D(APIC_ACCESS, apic->vcpu, (u32)offset, handler);
698
699 switch (offset) {
700 case APIC_ID: /* Local APIC ID */
701 apic_set_reg(apic, APIC_ID, val);
702 break;
703
704 case APIC_TASKPRI:
705 report_tpr_access(apic, true);
706 apic_set_tpr(apic, val & 0xff);
707 break;
708
709 case APIC_EOI:
710 apic_set_eoi(apic);
711 break;
712
713 case APIC_LDR:
714 apic_set_reg(apic, APIC_LDR, val & APIC_LDR_MASK);
715 break;
716
717 case APIC_DFR:
718 apic_set_reg(apic, APIC_DFR, val | 0x0FFFFFFF);
719 break;
720
721 case APIC_SPIV:
722 apic_set_reg(apic, APIC_SPIV, val & 0x3ff);
723 if (!(val & APIC_SPIV_APIC_ENABLED)) {
724 int i;
725 u32 lvt_val;
726
727 for (i = 0; i < APIC_LVT_NUM; i++) {
728 lvt_val = apic_get_reg(apic,
729 APIC_LVTT + 0x10 * i);
730 apic_set_reg(apic, APIC_LVTT + 0x10 * i,
731 lvt_val | APIC_LVT_MASKED);
732 }
733 atomic_set(&apic->timer.pending, 0);
734
735 }
736 break;
737
738 case APIC_ICR:
739 /* No delay here, so we always clear the pending bit */
740 apic_set_reg(apic, APIC_ICR, val & ~(1 << 12));
741 apic_send_ipi(apic);
742 break;
743
744 case APIC_ICR2:
745 apic_set_reg(apic, APIC_ICR2, val & 0xff000000);
746 break;
747
748 case APIC_LVT0:
749 apic_manage_nmi_watchdog(apic, val);
750 case APIC_LVTT:
751 case APIC_LVTTHMR:
752 case APIC_LVTPC:
753 case APIC_LVT1:
754 case APIC_LVTERR:
755 /* TODO: Check vector */
756 if (!apic_sw_enabled(apic))
757 val |= APIC_LVT_MASKED;
758
759 val &= apic_lvt_mask[(offset - APIC_LVTT) >> 4];
760 apic_set_reg(apic, offset, val);
761
762 break;
763
764 case APIC_TMICT:
765 hrtimer_cancel(&apic->timer.dev);
766 apic_set_reg(apic, APIC_TMICT, val);
767 start_apic_timer(apic);
768 return;
769
770 case APIC_TDCR:
771 if (val & 4)
772 printk(KERN_ERR "KVM_WRITE:TDCR %x\n", val);
773 apic_set_reg(apic, APIC_TDCR, val);
774 update_divide_count(apic);
775 break;
776
777 default:
778 apic_debug("Local APIC Write to read-only register %x\n",
779 offset);
780 break;
781 }
782
783 }
784
785 static int apic_mmio_range(struct kvm_io_device *this, gpa_t addr,
786 int len, int size)
787 {
788 struct kvm_lapic *apic = (struct kvm_lapic *)this->private;
789 int ret = 0;
790
791
792 if (apic_hw_enabled(apic) &&
793 (addr >= apic->base_address) &&
794 (addr < (apic->base_address + LAPIC_MMIO_LENGTH)))
795 ret = 1;
796
797 return ret;
798 }
799
800 void kvm_free_lapic(struct kvm_vcpu *vcpu)
801 {
802 if (!vcpu->arch.apic)
803 return;
804
805 hrtimer_cancel(&vcpu->arch.apic->timer.dev);
806
807 if (vcpu->arch.apic->regs_page)
808 __free_page(vcpu->arch.apic->regs_page);
809
810 kfree(vcpu->arch.apic);
811 }
812
813 /*
814 *----------------------------------------------------------------------
815 * LAPIC interface
816 *----------------------------------------------------------------------
817 */
818
819 void kvm_lapic_set_tpr(struct kvm_vcpu *vcpu, unsigned long cr8)
820 {
821 struct kvm_lapic *apic = vcpu->arch.apic;
822
823 if (!apic)
824 return;
825 apic_set_tpr(apic, ((cr8 & 0x0f) << 4)
826 | (apic_get_reg(apic, APIC_TASKPRI) & 4));
827 }
828 EXPORT_SYMBOL_GPL(kvm_lapic_set_tpr);
829
830 u64 kvm_lapic_get_cr8(struct kvm_vcpu *vcpu)
831 {
832 struct kvm_lapic *apic = vcpu->arch.apic;
833 u64 tpr;
834
835 if (!apic)
836 return 0;
837 tpr = (u64) apic_get_reg(apic, APIC_TASKPRI);
838
839 return (tpr & 0xf0) >> 4;
840 }
841 EXPORT_SYMBOL_GPL(kvm_lapic_get_cr8);
842
843 void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value)
844 {
845 struct kvm_lapic *apic = vcpu->arch.apic;
846
847 if (!apic) {
848 value |= MSR_IA32_APICBASE_BSP;
849 vcpu->arch.apic_base = value;
850 return;
851 }
852 if (apic->vcpu->vcpu_id)
853 value &= ~MSR_IA32_APICBASE_BSP;
854
855 vcpu->arch.apic_base = value;
856 apic->base_address = apic->vcpu->arch.apic_base &
857 MSR_IA32_APICBASE_BASE;
858
859 /* with FSB delivery interrupt, we can restart APIC functionality */
860 apic_debug("apic base msr is 0x%016" PRIx64 ", and base address is "
861 "0x%lx.\n", apic->vcpu->arch.apic_base, apic->base_address);
862
863 }
864
865 u64 kvm_lapic_get_base(struct kvm_vcpu *vcpu)
866 {
867 return vcpu->arch.apic_base;
868 }
869 EXPORT_SYMBOL_GPL(kvm_lapic_get_base);
870
871 void kvm_lapic_reset(struct kvm_vcpu *vcpu)
872 {
873 struct kvm_lapic *apic;
874 int i;
875
876 apic_debug("%s\n", __func__);
877
878 ASSERT(vcpu);
879 apic = vcpu->arch.apic;
880 ASSERT(apic != NULL);
881
882 /* Stop the timer in case it's a reset to an active apic */
883 hrtimer_cancel(&apic->timer.dev);
884
885 apic_set_reg(apic, APIC_ID, vcpu->vcpu_id << 24);
886 apic_set_reg(apic, APIC_LVR, APIC_VERSION);
887
888 for (i = 0; i < APIC_LVT_NUM; i++)
889 apic_set_reg(apic, APIC_LVTT + 0x10 * i, APIC_LVT_MASKED);
890 apic_set_reg(apic, APIC_LVT0,
891 SET_APIC_DELIVERY_MODE(0, APIC_MODE_EXTINT));
892
893 apic_set_reg(apic, APIC_DFR, 0xffffffffU);
894 apic_set_reg(apic, APIC_SPIV, 0xff);
895 apic_set_reg(apic, APIC_TASKPRI, 0);
896 apic_set_reg(apic, APIC_LDR, 0);
897 apic_set_reg(apic, APIC_ESR, 0);
898 apic_set_reg(apic, APIC_ICR, 0);
899 apic_set_reg(apic, APIC_ICR2, 0);
900 apic_set_reg(apic, APIC_TDCR, 0);
901 apic_set_reg(apic, APIC_TMICT, 0);
902 for (i = 0; i < 8; i++) {
903 apic_set_reg(apic, APIC_IRR + 0x10 * i, 0);
904 apic_set_reg(apic, APIC_ISR + 0x10 * i, 0);
905 apic_set_reg(apic, APIC_TMR + 0x10 * i, 0);
906 }
907 update_divide_count(apic);
908 atomic_set(&apic->timer.pending, 0);
909 if (vcpu->vcpu_id == 0)
910 vcpu->arch.apic_base |= MSR_IA32_APICBASE_BSP;
911 apic_update_ppr(apic);
912
913 apic_debug(KERN_INFO "%s: vcpu=%p, id=%d, base_msr="
914 "0x%016" PRIx64 ", base_address=0x%0lx.\n", __func__,
915 vcpu, kvm_apic_id(apic),
916 vcpu->arch.apic_base, apic->base_address);
917 }
918 EXPORT_SYMBOL_GPL(kvm_lapic_reset);
919
920 int kvm_lapic_enabled(struct kvm_vcpu *vcpu)
921 {
922 struct kvm_lapic *apic = vcpu->arch.apic;
923 int ret = 0;
924
925 if (!apic)
926 return 0;
927 ret = apic_enabled(apic);
928
929 return ret;
930 }
931 EXPORT_SYMBOL_GPL(kvm_lapic_enabled);
932
933 /*
934 *----------------------------------------------------------------------
935 * timer interface
936 *----------------------------------------------------------------------
937 */
938
939 /* TODO: make sure __apic_timer_fn runs in current pCPU */
940 static int __apic_timer_fn(struct kvm_lapic *apic)
941 {
942 int result = 0;
943 wait_queue_head_t *q = &apic->vcpu->wq;
944
945 if(!atomic_inc_and_test(&apic->timer.pending))
946 set_bit(KVM_REQ_PENDING_TIMER, &apic->vcpu->requests);
947 if (waitqueue_active(q))
948 wake_up_interruptible(q);
949
950 if (apic_lvtt_period(apic)) {
951 result = 1;
952 hrtimer_add_expires_ns(&apic->timer.dev, apic->timer.period);
953 }
954 return result;
955 }
956
957 int apic_has_pending_timer(struct kvm_vcpu *vcpu)
958 {
959 struct kvm_lapic *lapic = vcpu->arch.apic;
960
961 if (lapic && apic_enabled(lapic) && apic_lvt_enabled(lapic, APIC_LVTT))
962 return atomic_read(&lapic->timer.pending);
963
964 return 0;
965 }
966
967 static int kvm_apic_local_deliver(struct kvm_lapic *apic, int lvt_type)
968 {
969 u32 reg = apic_get_reg(apic, lvt_type);
970 int vector, mode, trig_mode;
971
972 if (apic_hw_enabled(apic) && !(reg & APIC_LVT_MASKED)) {
973 vector = reg & APIC_VECTOR_MASK;
974 mode = reg & APIC_MODE_MASK;
975 trig_mode = reg & APIC_LVT_LEVEL_TRIGGER;
976 return __apic_accept_irq(apic, mode, vector, 1, trig_mode);
977 }
978 return 0;
979 }
980
981 void kvm_apic_nmi_wd_deliver(struct kvm_vcpu *vcpu)
982 {
983 struct kvm_lapic *apic = vcpu->arch.apic;
984
985 if (apic)
986 kvm_apic_local_deliver(apic, APIC_LVT0);
987 }
988
989 static enum hrtimer_restart apic_timer_fn(struct hrtimer *data)
990 {
991 struct kvm_lapic *apic;
992 int restart_timer = 0;
993
994 apic = container_of(data, struct kvm_lapic, timer.dev);
995
996 restart_timer = __apic_timer_fn(apic);
997
998 if (restart_timer)
999 return HRTIMER_RESTART;
1000 else
1001 return HRTIMER_NORESTART;
1002 }
1003
1004 int kvm_create_lapic(struct kvm_vcpu *vcpu)
1005 {
1006 struct kvm_lapic *apic;
1007
1008 ASSERT(vcpu != NULL);
1009 apic_debug("apic_init %d\n", vcpu->vcpu_id);
1010
1011 apic = kzalloc(sizeof(*apic), GFP_KERNEL);
1012 if (!apic)
1013 goto nomem;
1014
1015 vcpu->arch.apic = apic;
1016
1017 apic->regs_page = alloc_page(GFP_KERNEL);
1018 if (apic->regs_page == NULL) {
1019 printk(KERN_ERR "malloc apic regs error for vcpu %x\n",
1020 vcpu->vcpu_id);
1021 goto nomem_free_apic;
1022 }
1023 apic->regs = page_address(apic->regs_page);
1024 memset(apic->regs, 0, PAGE_SIZE);
1025 apic->vcpu = vcpu;
1026
1027 hrtimer_init(&apic->timer.dev, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
1028 apic->timer.dev.function = apic_timer_fn;
1029 apic->base_address = APIC_DEFAULT_PHYS_BASE;
1030 vcpu->arch.apic_base = APIC_DEFAULT_PHYS_BASE;
1031
1032 kvm_lapic_reset(vcpu);
1033 apic->dev.read = apic_mmio_read;
1034 apic->dev.write = apic_mmio_write;
1035 apic->dev.in_range = apic_mmio_range;
1036 apic->dev.private = apic;
1037
1038 return 0;
1039 nomem_free_apic:
1040 kfree(apic);
1041 nomem:
1042 return -ENOMEM;
1043 }
1044 EXPORT_SYMBOL_GPL(kvm_create_lapic);
1045
1046 int kvm_apic_has_interrupt(struct kvm_vcpu *vcpu)
1047 {
1048 struct kvm_lapic *apic = vcpu->arch.apic;
1049 int highest_irr;
1050
1051 if (!apic || !apic_enabled(apic))
1052 return -1;
1053
1054 apic_update_ppr(apic);
1055 highest_irr = apic_find_highest_irr(apic);
1056 if ((highest_irr == -1) ||
1057 ((highest_irr & 0xF0) <= apic_get_reg(apic, APIC_PROCPRI)))
1058 return -1;
1059 return highest_irr;
1060 }
1061
1062 int kvm_apic_accept_pic_intr(struct kvm_vcpu *vcpu)
1063 {
1064 u32 lvt0 = apic_get_reg(vcpu->arch.apic, APIC_LVT0);
1065 int r = 0;
1066
1067 if (vcpu->vcpu_id == 0) {
1068 if (!apic_hw_enabled(vcpu->arch.apic))
1069 r = 1;
1070 if ((lvt0 & APIC_LVT_MASKED) == 0 &&
1071 GET_APIC_DELIVERY_MODE(lvt0) == APIC_MODE_EXTINT)
1072 r = 1;
1073 }
1074 return r;
1075 }
1076
1077 void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu)
1078 {
1079 struct kvm_lapic *apic = vcpu->arch.apic;
1080
1081 if (apic && atomic_read(&apic->timer.pending) > 0) {
1082 if (kvm_apic_local_deliver(apic, APIC_LVTT))
1083 atomic_dec(&apic->timer.pending);
1084 }
1085 }
1086
1087 int kvm_get_apic_interrupt(struct kvm_vcpu *vcpu)
1088 {
1089 int vector = kvm_apic_has_interrupt(vcpu);
1090 struct kvm_lapic *apic = vcpu->arch.apic;
1091
1092 if (vector == -1)
1093 return -1;
1094
1095 apic_set_vector(vector, apic->regs + APIC_ISR);
1096 apic_update_ppr(apic);
1097 apic_clear_irr(vector, apic);
1098 return vector;
1099 }
1100
1101 void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu)
1102 {
1103 struct kvm_lapic *apic = vcpu->arch.apic;
1104
1105 apic->base_address = vcpu->arch.apic_base &
1106 MSR_IA32_APICBASE_BASE;
1107 apic_set_reg(apic, APIC_LVR, APIC_VERSION);
1108 apic_update_ppr(apic);
1109 hrtimer_cancel(&apic->timer.dev);
1110 update_divide_count(apic);
1111 start_apic_timer(apic);
1112 }
1113
1114 void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu)
1115 {
1116 struct kvm_lapic *apic = vcpu->arch.apic;
1117 struct hrtimer *timer;
1118
1119 if (!apic)
1120 return;
1121
1122 timer = &apic->timer.dev;
1123 if (hrtimer_cancel(timer))
1124 hrtimer_start_expires(timer, HRTIMER_MODE_ABS);
1125 }
1126
1127 void kvm_lapic_sync_from_vapic(struct kvm_vcpu *vcpu)
1128 {
1129 u32 data;
1130 void *vapic;
1131
1132 if (!irqchip_in_kernel(vcpu->kvm) || !vcpu->arch.apic->vapic_addr)
1133 return;
1134
1135 vapic = kmap_atomic(vcpu->arch.apic->vapic_page, KM_USER0);
1136 data = *(u32 *)(vapic + offset_in_page(vcpu->arch.apic->vapic_addr));
1137 kunmap_atomic(vapic, KM_USER0);
1138
1139 apic_set_tpr(vcpu->arch.apic, data & 0xff);
1140 }
1141
1142 void kvm_lapic_sync_to_vapic(struct kvm_vcpu *vcpu)
1143 {
1144 u32 data, tpr;
1145 int max_irr, max_isr;
1146 struct kvm_lapic *apic;
1147 void *vapic;
1148
1149 if (!irqchip_in_kernel(vcpu->kvm) || !vcpu->arch.apic->vapic_addr)
1150 return;
1151
1152 apic = vcpu->arch.apic;
1153 tpr = apic_get_reg(apic, APIC_TASKPRI) & 0xff;
1154 max_irr = apic_find_highest_irr(apic);
1155 if (max_irr < 0)
1156 max_irr = 0;
1157 max_isr = apic_find_highest_isr(apic);
1158 if (max_isr < 0)
1159 max_isr = 0;
1160 data = (tpr & 0xff) | ((max_isr & 0xf0) << 8) | (max_irr << 24);
1161
1162 vapic = kmap_atomic(vcpu->arch.apic->vapic_page, KM_USER0);
1163 *(u32 *)(vapic + offset_in_page(vcpu->arch.apic->vapic_addr)) = data;
1164 kunmap_atomic(vapic, KM_USER0);
1165 }
1166
1167 void kvm_lapic_set_vapic_addr(struct kvm_vcpu *vcpu, gpa_t vapic_addr)
1168 {
1169 if (!irqchip_in_kernel(vcpu->kvm))
1170 return;
1171
1172 vcpu->arch.apic->vapic_addr = vapic_addr;
1173 }
Linux kernel - Deliverables
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