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hwmon: (it87) Expose the PWM/temperature mappings
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / arch / x86 / kvm / lapic.c
blobba8c045da7820fceea3286b2a60c1378fe28265d
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 #include "trace.h"
38 #include "x86.h"
39
40 #ifndef CONFIG_X86_64
41 #define mod_64(x, y) ((x) - (y) * div64_u64(x, y))
42 #else
43 #define mod_64(x, y) ((x) % (y))
44 #endif
45
46 #define PRId64 "d"
47 #define PRIx64 "llx"
48 #define PRIu64 "u"
49 #define PRIo64 "o"
50
51 #define APIC_BUS_CYCLE_NS 1
52
53 /* #define apic_debug(fmt,arg...) printk(KERN_WARNING fmt,##arg) */
54 #define apic_debug(fmt, arg...)
55
56 #define APIC_LVT_NUM 6
57 /* 14 is the version for Xeon and Pentium 8.4.8*/
58 #define APIC_VERSION (0x14UL | ((APIC_LVT_NUM - 1) << 16))
59 #define LAPIC_MMIO_LENGTH (1 << 12)
60 /* followed define is not in apicdef.h */
61 #define APIC_SHORT_MASK 0xc0000
62 #define APIC_DEST_NOSHORT 0x0
63 #define APIC_DEST_MASK 0x800
64 #define MAX_APIC_VECTOR 256
65
66 #define VEC_POS(v) ((v) & (32 - 1))
67 #define REG_POS(v) (((v) >> 5) << 4)
68
69 static inline u32 apic_get_reg(struct kvm_lapic *apic, int reg_off)
70 {
71 return *((u32 *) (apic->regs + reg_off));
72 }
73
74 static inline void apic_set_reg(struct kvm_lapic *apic, int reg_off, u32 val)
75 {
76 *((u32 *) (apic->regs + reg_off)) = val;
77 }
78
79 static inline int apic_test_and_set_vector(int vec, void *bitmap)
80 {
81 return test_and_set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
82 }
83
84 static inline int apic_test_and_clear_vector(int vec, void *bitmap)
85 {
86 return test_and_clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
87 }
88
89 static inline void apic_set_vector(int vec, void *bitmap)
90 {
91 set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
92 }
93
94 static inline void apic_clear_vector(int vec, void *bitmap)
95 {
96 clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
97 }
98
99 static inline int apic_hw_enabled(struct kvm_lapic *apic)
100 {
101 return (apic)->vcpu->arch.apic_base & MSR_IA32_APICBASE_ENABLE;
102 }
103
104 static inline int apic_sw_enabled(struct kvm_lapic *apic)
105 {
106 return apic_get_reg(apic, APIC_SPIV) & APIC_SPIV_APIC_ENABLED;
107 }
108
109 static inline int apic_enabled(struct kvm_lapic *apic)
110 {
111 return apic_sw_enabled(apic) && apic_hw_enabled(apic);
112 }
113
114 #define LVT_MASK \
115 (APIC_LVT_MASKED | APIC_SEND_PENDING | APIC_VECTOR_MASK)
116
117 #define LINT_MASK \
118 (LVT_MASK | APIC_MODE_MASK | APIC_INPUT_POLARITY | \
119 APIC_LVT_REMOTE_IRR | APIC_LVT_LEVEL_TRIGGER)
120
121 static inline int kvm_apic_id(struct kvm_lapic *apic)
122 {
123 return (apic_get_reg(apic, APIC_ID) >> 24) & 0xff;
124 }
125
126 static inline int apic_lvt_enabled(struct kvm_lapic *apic, int lvt_type)
127 {
128 return !(apic_get_reg(apic, lvt_type) & APIC_LVT_MASKED);
129 }
130
131 static inline int apic_lvt_vector(struct kvm_lapic *apic, int lvt_type)
132 {
133 return apic_get_reg(apic, lvt_type) & APIC_VECTOR_MASK;
134 }
135
136 static inline int apic_lvtt_period(struct kvm_lapic *apic)
137 {
138 return apic_get_reg(apic, APIC_LVTT) & APIC_LVT_TIMER_PERIODIC;
139 }
140
141 static inline int apic_lvt_nmi_mode(u32 lvt_val)
142 {
143 return (lvt_val & (APIC_MODE_MASK | APIC_LVT_MASKED)) == APIC_DM_NMI;
144 }
145
146 void kvm_apic_set_version(struct kvm_vcpu *vcpu)
147 {
148 struct kvm_lapic *apic = vcpu->arch.apic;
149 struct kvm_cpuid_entry2 *feat;
150 u32 v = APIC_VERSION;
151
152 if (!irqchip_in_kernel(vcpu->kvm))
153 return;
154
155 feat = kvm_find_cpuid_entry(apic->vcpu, 0x1, 0);
156 if (feat && (feat->ecx & (1 << (X86_FEATURE_X2APIC & 31))))
157 v |= APIC_LVR_DIRECTED_EOI;
158 apic_set_reg(apic, APIC_LVR, v);
159 }
160
161 static inline int apic_x2apic_mode(struct kvm_lapic *apic)
162 {
163 return apic->vcpu->arch.apic_base & X2APIC_ENABLE;
164 }
165
166 static unsigned int apic_lvt_mask[APIC_LVT_NUM] = {
167 LVT_MASK | APIC_LVT_TIMER_PERIODIC, /* LVTT */
168 LVT_MASK | APIC_MODE_MASK, /* LVTTHMR */
169 LVT_MASK | APIC_MODE_MASK, /* LVTPC */
170 LINT_MASK, LINT_MASK, /* LVT0-1 */
171 LVT_MASK /* LVTERR */
172 };
173
174 static int find_highest_vector(void *bitmap)
175 {
176 u32 *word = bitmap;
177 int word_offset = MAX_APIC_VECTOR >> 5;
178
179 while ((word_offset != 0) && (word[(--word_offset) << 2] == 0))
180 continue;
181
182 if (likely(!word_offset && !word[0]))
183 return -1;
184 else
185 return fls(word[word_offset << 2]) - 1 + (word_offset << 5);
186 }
187
188 static inline int apic_test_and_set_irr(int vec, struct kvm_lapic *apic)
189 {
190 apic->irr_pending = true;
191 return apic_test_and_set_vector(vec, apic->regs + APIC_IRR);
192 }
193
194 static inline int apic_search_irr(struct kvm_lapic *apic)
195 {
196 return find_highest_vector(apic->regs + APIC_IRR);
197 }
198
199 static inline int apic_find_highest_irr(struct kvm_lapic *apic)
200 {
201 int result;
202
203 if (!apic->irr_pending)
204 return -1;
205
206 result = apic_search_irr(apic);
207 ASSERT(result == -1 || result >= 16);
208
209 return result;
210 }
211
212 static inline void apic_clear_irr(int vec, struct kvm_lapic *apic)
213 {
214 apic->irr_pending = false;
215 apic_clear_vector(vec, apic->regs + APIC_IRR);
216 if (apic_search_irr(apic) != -1)
217 apic->irr_pending = true;
218 }
219
220 int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu)
221 {
222 struct kvm_lapic *apic = vcpu->arch.apic;
223 int highest_irr;
224
225 /* This may race with setting of irr in __apic_accept_irq() and
226 * value returned may be wrong, but kvm_vcpu_kick() in __apic_accept_irq
227 * will cause vmexit immediately and the value will be recalculated
228 * on the next vmentry.
229 */
230 if (!apic)
231 return 0;
232 highest_irr = apic_find_highest_irr(apic);
233
234 return highest_irr;
235 }
236
237 static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
238 int vector, int level, int trig_mode);
239
240 int kvm_apic_set_irq(struct kvm_vcpu *vcpu, struct kvm_lapic_irq *irq)
241 {
242 struct kvm_lapic *apic = vcpu->arch.apic;
243
244 return __apic_accept_irq(apic, irq->delivery_mode, irq->vector,
245 irq->level, irq->trig_mode);
246 }
247
248 static inline int apic_find_highest_isr(struct kvm_lapic *apic)
249 {
250 int result;
251
252 result = find_highest_vector(apic->regs + APIC_ISR);
253 ASSERT(result == -1 || result >= 16);
254
255 return result;
256 }
257
258 static void apic_update_ppr(struct kvm_lapic *apic)
259 {
260 u32 tpr, isrv, ppr;
261 int isr;
262
263 tpr = apic_get_reg(apic, APIC_TASKPRI);
264 isr = apic_find_highest_isr(apic);
265 isrv = (isr != -1) ? isr : 0;
266
267 if ((tpr & 0xf0) >= (isrv & 0xf0))
268 ppr = tpr & 0xff;
269 else
270 ppr = isrv & 0xf0;
271
272 apic_debug("vlapic %p, ppr 0x%x, isr 0x%x, isrv 0x%x",
273 apic, ppr, isr, isrv);
274
275 apic_set_reg(apic, APIC_PROCPRI, ppr);
276 }
277
278 static void apic_set_tpr(struct kvm_lapic *apic, u32 tpr)
279 {
280 apic_set_reg(apic, APIC_TASKPRI, tpr);
281 apic_update_ppr(apic);
282 }
283
284 int kvm_apic_match_physical_addr(struct kvm_lapic *apic, u16 dest)
285 {
286 return dest == 0xff || kvm_apic_id(apic) == dest;
287 }
288
289 int kvm_apic_match_logical_addr(struct kvm_lapic *apic, u8 mda)
290 {
291 int result = 0;
292 u32 logical_id;
293
294 if (apic_x2apic_mode(apic)) {
295 logical_id = apic_get_reg(apic, APIC_LDR);
296 return logical_id & mda;
297 }
298
299 logical_id = GET_APIC_LOGICAL_ID(apic_get_reg(apic, APIC_LDR));
300
301 switch (apic_get_reg(apic, APIC_DFR)) {
302 case APIC_DFR_FLAT:
303 if (logical_id & mda)
304 result = 1;
305 break;
306 case APIC_DFR_CLUSTER:
307 if (((logical_id >> 4) == (mda >> 0x4))
308 && (logical_id & mda & 0xf))
309 result = 1;
310 break;
311 default:
312 printk(KERN_WARNING "Bad DFR vcpu %d: %08x\n",
313 apic->vcpu->vcpu_id, apic_get_reg(apic, APIC_DFR));
314 break;
315 }
316
317 return result;
318 }
319
320 int kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
321 int short_hand, int dest, int dest_mode)
322 {
323 int result = 0;
324 struct kvm_lapic *target = vcpu->arch.apic;
325
326 apic_debug("target %p, source %p, dest 0x%x, "
327 "dest_mode 0x%x, short_hand 0x%x\n",
328 target, source, dest, dest_mode, short_hand);
329
330 ASSERT(!target);
331 switch (short_hand) {
332 case APIC_DEST_NOSHORT:
333 if (dest_mode == 0)
334 /* Physical mode. */
335 result = kvm_apic_match_physical_addr(target, dest);
336 else
337 /* Logical mode. */
338 result = kvm_apic_match_logical_addr(target, dest);
339 break;
340 case APIC_DEST_SELF:
341 result = (target == source);
342 break;
343 case APIC_DEST_ALLINC:
344 result = 1;
345 break;
346 case APIC_DEST_ALLBUT:
347 result = (target != source);
348 break;
349 default:
350 printk(KERN_WARNING "Bad dest shorthand value %x\n",
351 short_hand);
352 break;
353 }
354
355 return result;
356 }
357
358 /*
359 * Add a pending IRQ into lapic.
360 * Return 1 if successfully added and 0 if discarded.
361 */
362 static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
363 int vector, int level, int trig_mode)
364 {
365 int result = 0;
366 struct kvm_vcpu *vcpu = apic->vcpu;
367
368 switch (delivery_mode) {
369 case APIC_DM_LOWEST:
370 vcpu->arch.apic_arb_prio++;
371 case APIC_DM_FIXED:
372 /* FIXME add logic for vcpu on reset */
373 if (unlikely(!apic_enabled(apic)))
374 break;
375
376 if (trig_mode) {
377 apic_debug("level trig mode for vector %d", vector);
378 apic_set_vector(vector, apic->regs + APIC_TMR);
379 } else
380 apic_clear_vector(vector, apic->regs + APIC_TMR);
381
382 result = !apic_test_and_set_irr(vector, apic);
383 trace_kvm_apic_accept_irq(vcpu->vcpu_id, delivery_mode,
384 trig_mode, vector, !result);
385 if (!result) {
386 if (trig_mode)
387 apic_debug("level trig mode repeatedly for "
388 "vector %d", vector);
389 break;
390 }
391
392 kvm_vcpu_kick(vcpu);
393 break;
394
395 case APIC_DM_REMRD:
396 printk(KERN_DEBUG "Ignoring delivery mode 3\n");
397 break;
398
399 case APIC_DM_SMI:
400 printk(KERN_DEBUG "Ignoring guest SMI\n");
401 break;
402
403 case APIC_DM_NMI:
404 result = 1;
405 kvm_inject_nmi(vcpu);
406 kvm_vcpu_kick(vcpu);
407 break;
408
409 case APIC_DM_INIT:
410 if (level) {
411 result = 1;
412 if (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE)
413 printk(KERN_DEBUG
414 "INIT on a runnable vcpu %d\n",
415 vcpu->vcpu_id);
416 vcpu->arch.mp_state = KVM_MP_STATE_INIT_RECEIVED;
417 kvm_vcpu_kick(vcpu);
418 } else {
419 apic_debug("Ignoring de-assert INIT to vcpu %d\n",
420 vcpu->vcpu_id);
421 }
422 break;
423
424 case APIC_DM_STARTUP:
425 apic_debug("SIPI to vcpu %d vector 0x%02x\n",
426 vcpu->vcpu_id, vector);
427 if (vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) {
428 result = 1;
429 vcpu->arch.sipi_vector = vector;
430 vcpu->arch.mp_state = KVM_MP_STATE_SIPI_RECEIVED;
431 kvm_vcpu_kick(vcpu);
432 }
433 break;
434
435 case APIC_DM_EXTINT:
436 /*
437 * Should only be called by kvm_apic_local_deliver() with LVT0,
438 * before NMI watchdog was enabled. Already handled by
439 * kvm_apic_accept_pic_intr().
440 */
441 break;
442
443 default:
444 printk(KERN_ERR "TODO: unsupported delivery mode %x\n",
445 delivery_mode);
446 break;
447 }
448 return result;
449 }
450
451 int kvm_apic_compare_prio(struct kvm_vcpu *vcpu1, struct kvm_vcpu *vcpu2)
452 {
453 return vcpu1->arch.apic_arb_prio - vcpu2->arch.apic_arb_prio;
454 }
455
456 static void apic_set_eoi(struct kvm_lapic *apic)
457 {
458 int vector = apic_find_highest_isr(apic);
459 int trigger_mode;
460 /*
461 * Not every write EOI will has corresponding ISR,
462 * one example is when Kernel check timer on setup_IO_APIC
463 */
464 if (vector == -1)
465 return;
466
467 apic_clear_vector(vector, apic->regs + APIC_ISR);
468 apic_update_ppr(apic);
469
470 if (apic_test_and_clear_vector(vector, apic->regs + APIC_TMR))
471 trigger_mode = IOAPIC_LEVEL_TRIG;
472 else
473 trigger_mode = IOAPIC_EDGE_TRIG;
474 if (!(apic_get_reg(apic, APIC_SPIV) & APIC_SPIV_DIRECTED_EOI))
475 kvm_ioapic_update_eoi(apic->vcpu->kvm, vector, trigger_mode);
476 }
477
478 static void apic_send_ipi(struct kvm_lapic *apic)
479 {
480 u32 icr_low = apic_get_reg(apic, APIC_ICR);
481 u32 icr_high = apic_get_reg(apic, APIC_ICR2);
482 struct kvm_lapic_irq irq;
483
484 irq.vector = icr_low & APIC_VECTOR_MASK;
485 irq.delivery_mode = icr_low & APIC_MODE_MASK;
486 irq.dest_mode = icr_low & APIC_DEST_MASK;
487 irq.level = icr_low & APIC_INT_ASSERT;
488 irq.trig_mode = icr_low & APIC_INT_LEVELTRIG;
489 irq.shorthand = icr_low & APIC_SHORT_MASK;
490 if (apic_x2apic_mode(apic))
491 irq.dest_id = icr_high;
492 else
493 irq.dest_id = GET_APIC_DEST_FIELD(icr_high);
494
495 trace_kvm_apic_ipi(icr_low, irq.dest_id);
496
497 apic_debug("icr_high 0x%x, icr_low 0x%x, "
498 "short_hand 0x%x, dest 0x%x, trig_mode 0x%x, level 0x%x, "
499 "dest_mode 0x%x, delivery_mode 0x%x, vector 0x%x\n",
500 icr_high, icr_low, irq.shorthand, irq.dest_id,
501 irq.trig_mode, irq.level, irq.dest_mode, irq.delivery_mode,
502 irq.vector);
503
504 kvm_irq_delivery_to_apic(apic->vcpu->kvm, apic, &irq);
505 }
506
507 static u32 apic_get_tmcct(struct kvm_lapic *apic)
508 {
509 ktime_t remaining;
510 s64 ns;
511 u32 tmcct;
512
513 ASSERT(apic != NULL);
514
515 /* if initial count is 0, current count should also be 0 */
516 if (apic_get_reg(apic, APIC_TMICT) == 0)
517 return 0;
518
519 remaining = hrtimer_get_remaining(&apic->lapic_timer.timer);
520 if (ktime_to_ns(remaining) < 0)
521 remaining = ktime_set(0, 0);
522
523 ns = mod_64(ktime_to_ns(remaining), apic->lapic_timer.period);
524 tmcct = div64_u64(ns,
525 (APIC_BUS_CYCLE_NS * apic->divide_count));
526
527 return tmcct;
528 }
529
530 static void __report_tpr_access(struct kvm_lapic *apic, bool write)
531 {
532 struct kvm_vcpu *vcpu = apic->vcpu;
533 struct kvm_run *run = vcpu->run;
534
535 set_bit(KVM_REQ_REPORT_TPR_ACCESS, &vcpu->requests);
536 run->tpr_access.rip = kvm_rip_read(vcpu);
537 run->tpr_access.is_write = write;
538 }
539
540 static inline void report_tpr_access(struct kvm_lapic *apic, bool write)
541 {
542 if (apic->vcpu->arch.tpr_access_reporting)
543 __report_tpr_access(apic, write);
544 }
545
546 static u32 __apic_read(struct kvm_lapic *apic, unsigned int offset)
547 {
548 u32 val = 0;
549
550 if (offset >= LAPIC_MMIO_LENGTH)
551 return 0;
552
553 switch (offset) {
554 case APIC_ID:
555 if (apic_x2apic_mode(apic))
556 val = kvm_apic_id(apic);
557 else
558 val = kvm_apic_id(apic) << 24;
559 break;
560 case APIC_ARBPRI:
561 printk(KERN_WARNING "Access APIC ARBPRI register "
562 "which is for P6\n");
563 break;
564
565 case APIC_TMCCT: /* Timer CCR */
566 val = apic_get_tmcct(apic);
567 break;
568
569 case APIC_TASKPRI:
570 report_tpr_access(apic, false);
571 /* fall thru */
572 default:
573 apic_update_ppr(apic);
574 val = apic_get_reg(apic, offset);
575 break;
576 }
577
578 return val;
579 }
580
581 static inline struct kvm_lapic *to_lapic(struct kvm_io_device *dev)
582 {
583 return container_of(dev, struct kvm_lapic, dev);
584 }
585
586 static int apic_reg_read(struct kvm_lapic *apic, u32 offset, int len,
587 void *data)
588 {
589 unsigned char alignment = offset & 0xf;
590 u32 result;
591 /* this bitmask has a bit cleared for each reserver register */
592 static const u64 rmask = 0x43ff01ffffffe70cULL;
593
594 if ((alignment + len) > 4) {
595 apic_debug("KVM_APIC_READ: alignment error %x %d\n",
596 offset, len);
597 return 1;
598 }
599
600 if (offset > 0x3f0 || !(rmask & (1ULL << (offset >> 4)))) {
601 apic_debug("KVM_APIC_READ: read reserved register %x\n",
602 offset);
603 return 1;
604 }
605
606 result = __apic_read(apic, offset & ~0xf);
607
608 trace_kvm_apic_read(offset, result);
609
610 switch (len) {
611 case 1:
612 case 2:
613 case 4:
614 memcpy(data, (char *)&result + alignment, len);
615 break;
616 default:
617 printk(KERN_ERR "Local APIC read with len = %x, "
618 "should be 1,2, or 4 instead\n", len);
619 break;
620 }
621 return 0;
622 }
623
624 static int apic_mmio_in_range(struct kvm_lapic *apic, gpa_t addr)
625 {
626 return apic_hw_enabled(apic) &&
627 addr >= apic->base_address &&
628 addr < apic->base_address + LAPIC_MMIO_LENGTH;
629 }
630
631 static int apic_mmio_read(struct kvm_io_device *this,
632 gpa_t address, int len, void *data)
633 {
634 struct kvm_lapic *apic = to_lapic(this);
635 u32 offset = address - apic->base_address;
636
637 if (!apic_mmio_in_range(apic, address))
638 return -EOPNOTSUPP;
639
640 apic_reg_read(apic, offset, len, data);
641
642 return 0;
643 }
644
645 static void update_divide_count(struct kvm_lapic *apic)
646 {
647 u32 tmp1, tmp2, tdcr;
648
649 tdcr = apic_get_reg(apic, APIC_TDCR);
650 tmp1 = tdcr & 0xf;
651 tmp2 = ((tmp1 & 0x3) | ((tmp1 & 0x8) >> 1)) + 1;
652 apic->divide_count = 0x1 << (tmp2 & 0x7);
653
654 apic_debug("timer divide count is 0x%x\n",
655 apic->divide_count);
656 }
657
658 static void start_apic_timer(struct kvm_lapic *apic)
659 {
660 ktime_t now = apic->lapic_timer.timer.base->get_time();
661
662 apic->lapic_timer.period = (u64)apic_get_reg(apic, APIC_TMICT) *
663 APIC_BUS_CYCLE_NS * apic->divide_count;
664 atomic_set(&apic->lapic_timer.pending, 0);
665
666 if (!apic->lapic_timer.period)
667 return;
668 /*
669 * Do not allow the guest to program periodic timers with small
670 * interval, since the hrtimers are not throttled by the host
671 * scheduler.
672 */
673 if (apic_lvtt_period(apic)) {
674 if (apic->lapic_timer.period < NSEC_PER_MSEC/2)
675 apic->lapic_timer.period = NSEC_PER_MSEC/2;
676 }
677
678 hrtimer_start(&apic->lapic_timer.timer,
679 ktime_add_ns(now, apic->lapic_timer.period),
680 HRTIMER_MODE_ABS);
681
682 apic_debug("%s: bus cycle is %" PRId64 "ns, now 0x%016"
683 PRIx64 ", "
684 "timer initial count 0x%x, period %lldns, "
685 "expire @ 0x%016" PRIx64 ".\n", __func__,
686 APIC_BUS_CYCLE_NS, ktime_to_ns(now),
687 apic_get_reg(apic, APIC_TMICT),
688 apic->lapic_timer.period,
689 ktime_to_ns(ktime_add_ns(now,
690 apic->lapic_timer.period)));
691 }
692
693 static void apic_manage_nmi_watchdog(struct kvm_lapic *apic, u32 lvt0_val)
694 {
695 int nmi_wd_enabled = apic_lvt_nmi_mode(apic_get_reg(apic, APIC_LVT0));
696
697 if (apic_lvt_nmi_mode(lvt0_val)) {
698 if (!nmi_wd_enabled) {
699 apic_debug("Receive NMI setting on APIC_LVT0 "
700 "for cpu %d\n", apic->vcpu->vcpu_id);
701 apic->vcpu->kvm->arch.vapics_in_nmi_mode++;
702 }
703 } else if (nmi_wd_enabled)
704 apic->vcpu->kvm->arch.vapics_in_nmi_mode--;
705 }
706
707 static int apic_reg_write(struct kvm_lapic *apic, u32 reg, u32 val)
708 {
709 int ret = 0;
710
711 trace_kvm_apic_write(reg, val);
712
713 switch (reg) {
714 case APIC_ID: /* Local APIC ID */
715 if (!apic_x2apic_mode(apic))
716 apic_set_reg(apic, APIC_ID, val);
717 else
718 ret = 1;
719 break;
720
721 case APIC_TASKPRI:
722 report_tpr_access(apic, true);
723 apic_set_tpr(apic, val & 0xff);
724 break;
725
726 case APIC_EOI:
727 apic_set_eoi(apic);
728 break;
729
730 case APIC_LDR:
731 if (!apic_x2apic_mode(apic))
732 apic_set_reg(apic, APIC_LDR, val & APIC_LDR_MASK);
733 else
734 ret = 1;
735 break;
736
737 case APIC_DFR:
738 if (!apic_x2apic_mode(apic))
739 apic_set_reg(apic, APIC_DFR, val | 0x0FFFFFFF);
740 else
741 ret = 1;
742 break;
743
744 case APIC_SPIV: {
745 u32 mask = 0x3ff;
746 if (apic_get_reg(apic, APIC_LVR) & APIC_LVR_DIRECTED_EOI)
747 mask |= APIC_SPIV_DIRECTED_EOI;
748 apic_set_reg(apic, APIC_SPIV, val & mask);
749 if (!(val & APIC_SPIV_APIC_ENABLED)) {
750 int i;
751 u32 lvt_val;
752
753 for (i = 0; i < APIC_LVT_NUM; i++) {
754 lvt_val = apic_get_reg(apic,
755 APIC_LVTT + 0x10 * i);
756 apic_set_reg(apic, APIC_LVTT + 0x10 * i,
757 lvt_val | APIC_LVT_MASKED);
758 }
759 atomic_set(&apic->lapic_timer.pending, 0);
760
761 }
762 break;
763 }
764 case APIC_ICR:
765 /* No delay here, so we always clear the pending bit */
766 apic_set_reg(apic, APIC_ICR, val & ~(1 << 12));
767 apic_send_ipi(apic);
768 break;
769
770 case APIC_ICR2:
771 if (!apic_x2apic_mode(apic))
772 val &= 0xff000000;
773 apic_set_reg(apic, APIC_ICR2, val);
774 break;
775
776 case APIC_LVT0:
777 apic_manage_nmi_watchdog(apic, val);
778 case APIC_LVTT:
779 case APIC_LVTTHMR:
780 case APIC_LVTPC:
781 case APIC_LVT1:
782 case APIC_LVTERR:
783 /* TODO: Check vector */
784 if (!apic_sw_enabled(apic))
785 val |= APIC_LVT_MASKED;
786
787 val &= apic_lvt_mask[(reg - APIC_LVTT) >> 4];
788 apic_set_reg(apic, reg, val);
789
790 break;
791
792 case APIC_TMICT:
793 hrtimer_cancel(&apic->lapic_timer.timer);
794 apic_set_reg(apic, APIC_TMICT, val);
795 start_apic_timer(apic);
796 break;
797
798 case APIC_TDCR:
799 if (val & 4)
800 printk(KERN_ERR "KVM_WRITE:TDCR %x\n", val);
801 apic_set_reg(apic, APIC_TDCR, val);
802 update_divide_count(apic);
803 break;
804
805 case APIC_ESR:
806 if (apic_x2apic_mode(apic) && val != 0) {
807 printk(KERN_ERR "KVM_WRITE:ESR not zero %x\n", val);
808 ret = 1;
809 }
810 break;
811
812 case APIC_SELF_IPI:
813 if (apic_x2apic_mode(apic)) {
814 apic_reg_write(apic, APIC_ICR, 0x40000 | (val & 0xff));
815 } else
816 ret = 1;
817 break;
818 default:
819 ret = 1;
820 break;
821 }
822 if (ret)
823 apic_debug("Local APIC Write to read-only register %x\n", reg);
824 return ret;
825 }
826
827 static int apic_mmio_write(struct kvm_io_device *this,
828 gpa_t address, int len, const void *data)
829 {
830 struct kvm_lapic *apic = to_lapic(this);
831 unsigned int offset = address - apic->base_address;
832 u32 val;
833
834 if (!apic_mmio_in_range(apic, address))
835 return -EOPNOTSUPP;
836
837 /*
838 * APIC register must be aligned on 128-bits boundary.
839 * 32/64/128 bits registers must be accessed thru 32 bits.
840 * Refer SDM 8.4.1
841 */
842 if (len != 4 || (offset & 0xf)) {
843 /* Don't shout loud, $infamous_os would cause only noise. */
844 apic_debug("apic write: bad size=%d %lx\n", len, (long)address);
845 return 0;
846 }
847
848 val = *(u32*)data;
849
850 /* too common printing */
851 if (offset != APIC_EOI)
852 apic_debug("%s: offset 0x%x with length 0x%x, and value is "
853 "0x%x\n", __func__, offset, len, val);
854
855 apic_reg_write(apic, offset & 0xff0, val);
856
857 return 0;
858 }
859
860 void kvm_free_lapic(struct kvm_vcpu *vcpu)
861 {
862 if (!vcpu->arch.apic)
863 return;
864
865 hrtimer_cancel(&vcpu->arch.apic->lapic_timer.timer);
866
867 if (vcpu->arch.apic->regs_page)
868 __free_page(vcpu->arch.apic->regs_page);
869
870 kfree(vcpu->arch.apic);
871 }
872
873 /*
874 *----------------------------------------------------------------------
875 * LAPIC interface
876 *----------------------------------------------------------------------
877 */
878
879 void kvm_lapic_set_tpr(struct kvm_vcpu *vcpu, unsigned long cr8)
880 {
881 struct kvm_lapic *apic = vcpu->arch.apic;
882
883 if (!apic)
884 return;
885 apic_set_tpr(apic, ((cr8 & 0x0f) << 4)
886 | (apic_get_reg(apic, APIC_TASKPRI) & 4));
887 }
888
889 u64 kvm_lapic_get_cr8(struct kvm_vcpu *vcpu)
890 {
891 struct kvm_lapic *apic = vcpu->arch.apic;
892 u64 tpr;
893
894 if (!apic)
895 return 0;
896 tpr = (u64) apic_get_reg(apic, APIC_TASKPRI);
897
898 return (tpr & 0xf0) >> 4;
899 }
900
901 void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value)
902 {
903 struct kvm_lapic *apic = vcpu->arch.apic;
904
905 if (!apic) {
906 value |= MSR_IA32_APICBASE_BSP;
907 vcpu->arch.apic_base = value;
908 return;
909 }
910
911 if (!kvm_vcpu_is_bsp(apic->vcpu))
912 value &= ~MSR_IA32_APICBASE_BSP;
913
914 vcpu->arch.apic_base = value;
915 if (apic_x2apic_mode(apic)) {
916 u32 id = kvm_apic_id(apic);
917 u32 ldr = ((id & ~0xf) << 16) | (1 << (id & 0xf));
918 apic_set_reg(apic, APIC_LDR, ldr);
919 }
920 apic->base_address = apic->vcpu->arch.apic_base &
921 MSR_IA32_APICBASE_BASE;
922
923 /* with FSB delivery interrupt, we can restart APIC functionality */
924 apic_debug("apic base msr is 0x%016" PRIx64 ", and base address is "
925 "0x%lx.\n", apic->vcpu->arch.apic_base, apic->base_address);
926
927 }
928
929 void kvm_lapic_reset(struct kvm_vcpu *vcpu)
930 {
931 struct kvm_lapic *apic;
932 int i;
933
934 apic_debug("%s\n", __func__);
935
936 ASSERT(vcpu);
937 apic = vcpu->arch.apic;
938 ASSERT(apic != NULL);
939
940 /* Stop the timer in case it's a reset to an active apic */
941 hrtimer_cancel(&apic->lapic_timer.timer);
942
943 apic_set_reg(apic, APIC_ID, vcpu->vcpu_id << 24);
944 kvm_apic_set_version(apic->vcpu);
945
946 for (i = 0; i < APIC_LVT_NUM; i++)
947 apic_set_reg(apic, APIC_LVTT + 0x10 * i, APIC_LVT_MASKED);
948 apic_set_reg(apic, APIC_LVT0,
949 SET_APIC_DELIVERY_MODE(0, APIC_MODE_EXTINT));
950
951 apic_set_reg(apic, APIC_DFR, 0xffffffffU);
952 apic_set_reg(apic, APIC_SPIV, 0xff);
953 apic_set_reg(apic, APIC_TASKPRI, 0);
954 apic_set_reg(apic, APIC_LDR, 0);
955 apic_set_reg(apic, APIC_ESR, 0);
956 apic_set_reg(apic, APIC_ICR, 0);
957 apic_set_reg(apic, APIC_ICR2, 0);
958 apic_set_reg(apic, APIC_TDCR, 0);
959 apic_set_reg(apic, APIC_TMICT, 0);
960 for (i = 0; i < 8; i++) {
961 apic_set_reg(apic, APIC_IRR + 0x10 * i, 0);
962 apic_set_reg(apic, APIC_ISR + 0x10 * i, 0);
963 apic_set_reg(apic, APIC_TMR + 0x10 * i, 0);
964 }
965 apic->irr_pending = false;
966 update_divide_count(apic);
967 atomic_set(&apic->lapic_timer.pending, 0);
968 if (kvm_vcpu_is_bsp(vcpu))
969 vcpu->arch.apic_base |= MSR_IA32_APICBASE_BSP;
970 apic_update_ppr(apic);
971
972 vcpu->arch.apic_arb_prio = 0;
973
974 apic_debug(KERN_INFO "%s: vcpu=%p, id=%d, base_msr="
975 "0x%016" PRIx64 ", base_address=0x%0lx.\n", __func__,
976 vcpu, kvm_apic_id(apic),
977 vcpu->arch.apic_base, apic->base_address);
978 }
979
980 bool kvm_apic_present(struct kvm_vcpu *vcpu)
981 {
982 return vcpu->arch.apic && apic_hw_enabled(vcpu->arch.apic);
983 }
984
985 int kvm_lapic_enabled(struct kvm_vcpu *vcpu)
986 {
987 return kvm_apic_present(vcpu) && apic_sw_enabled(vcpu->arch.apic);
988 }
989
990 /*
991 *----------------------------------------------------------------------
992 * timer interface
993 *----------------------------------------------------------------------
994 */
995
996 static bool lapic_is_periodic(struct kvm_timer *ktimer)
997 {
998 struct kvm_lapic *apic = container_of(ktimer, struct kvm_lapic,
999 lapic_timer);
1000 return apic_lvtt_period(apic);
1001 }
1002
1003 int apic_has_pending_timer(struct kvm_vcpu *vcpu)
1004 {
1005 struct kvm_lapic *lapic = vcpu->arch.apic;
1006
1007 if (lapic && apic_enabled(lapic) && apic_lvt_enabled(lapic, APIC_LVTT))
1008 return atomic_read(&lapic->lapic_timer.pending);
1009
1010 return 0;
1011 }
1012
1013 static int kvm_apic_local_deliver(struct kvm_lapic *apic, int lvt_type)
1014 {
1015 u32 reg = apic_get_reg(apic, lvt_type);
1016 int vector, mode, trig_mode;
1017
1018 if (apic_hw_enabled(apic) && !(reg & APIC_LVT_MASKED)) {
1019 vector = reg & APIC_VECTOR_MASK;
1020 mode = reg & APIC_MODE_MASK;
1021 trig_mode = reg & APIC_LVT_LEVEL_TRIGGER;
1022 return __apic_accept_irq(apic, mode, vector, 1, trig_mode);
1023 }
1024 return 0;
1025 }
1026
1027 void kvm_apic_nmi_wd_deliver(struct kvm_vcpu *vcpu)
1028 {
1029 struct kvm_lapic *apic = vcpu->arch.apic;
1030
1031 if (apic)
1032 kvm_apic_local_deliver(apic, APIC_LVT0);
1033 }
1034
1035 static struct kvm_timer_ops lapic_timer_ops = {
1036 .is_periodic = lapic_is_periodic,
1037 };
1038
1039 static const struct kvm_io_device_ops apic_mmio_ops = {
1040 .read = apic_mmio_read,
1041 .write = apic_mmio_write,
1042 };
1043
1044 int kvm_create_lapic(struct kvm_vcpu *vcpu)
1045 {
1046 struct kvm_lapic *apic;
1047
1048 ASSERT(vcpu != NULL);
1049 apic_debug("apic_init %d\n", vcpu->vcpu_id);
1050
1051 apic = kzalloc(sizeof(*apic), GFP_KERNEL);
1052 if (!apic)
1053 goto nomem;
1054
1055 vcpu->arch.apic = apic;
1056
1057 apic->regs_page = alloc_page(GFP_KERNEL);
1058 if (apic->regs_page == NULL) {
1059 printk(KERN_ERR "malloc apic regs error for vcpu %x\n",
1060 vcpu->vcpu_id);
1061 goto nomem_free_apic;
1062 }
1063 apic->regs = page_address(apic->regs_page);
1064 memset(apic->regs, 0, PAGE_SIZE);
1065 apic->vcpu = vcpu;
1066
1067 hrtimer_init(&apic->lapic_timer.timer, CLOCK_MONOTONIC,
1068 HRTIMER_MODE_ABS);
1069 apic->lapic_timer.timer.function = kvm_timer_fn;
1070 apic->lapic_timer.t_ops = &lapic_timer_ops;
1071 apic->lapic_timer.kvm = vcpu->kvm;
1072 apic->lapic_timer.vcpu = vcpu;
1073
1074 apic->base_address = APIC_DEFAULT_PHYS_BASE;
1075 vcpu->arch.apic_base = APIC_DEFAULT_PHYS_BASE;
1076
1077 kvm_lapic_reset(vcpu);
1078 kvm_iodevice_init(&apic->dev, &apic_mmio_ops);
1079
1080 return 0;
1081 nomem_free_apic:
1082 kfree(apic);
1083 nomem:
1084 return -ENOMEM;
1085 }
1086
1087 int kvm_apic_has_interrupt(struct kvm_vcpu *vcpu)
1088 {
1089 struct kvm_lapic *apic = vcpu->arch.apic;
1090 int highest_irr;
1091
1092 if (!apic || !apic_enabled(apic))
1093 return -1;
1094
1095 apic_update_ppr(apic);
1096 highest_irr = apic_find_highest_irr(apic);
1097 if ((highest_irr == -1) ||
1098 ((highest_irr & 0xF0) <= apic_get_reg(apic, APIC_PROCPRI)))
1099 return -1;
1100 return highest_irr;
1101 }
1102
1103 int kvm_apic_accept_pic_intr(struct kvm_vcpu *vcpu)
1104 {
1105 u32 lvt0 = apic_get_reg(vcpu->arch.apic, APIC_LVT0);
1106 int r = 0;
1107
1108 if (kvm_vcpu_is_bsp(vcpu)) {
1109 if (!apic_hw_enabled(vcpu->arch.apic))
1110 r = 1;
1111 if ((lvt0 & APIC_LVT_MASKED) == 0 &&
1112 GET_APIC_DELIVERY_MODE(lvt0) == APIC_MODE_EXTINT)
1113 r = 1;
1114 }
1115 return r;
1116 }
1117
1118 void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu)
1119 {
1120 struct kvm_lapic *apic = vcpu->arch.apic;
1121
1122 if (apic && atomic_read(&apic->lapic_timer.pending) > 0) {
1123 if (kvm_apic_local_deliver(apic, APIC_LVTT))
1124 atomic_dec(&apic->lapic_timer.pending);
1125 }
1126 }
1127
1128 int kvm_get_apic_interrupt(struct kvm_vcpu *vcpu)
1129 {
1130 int vector = kvm_apic_has_interrupt(vcpu);
1131 struct kvm_lapic *apic = vcpu->arch.apic;
1132
1133 if (vector == -1)
1134 return -1;
1135
1136 apic_set_vector(vector, apic->regs + APIC_ISR);
1137 apic_update_ppr(apic);
1138 apic_clear_irr(vector, apic);
1139 return vector;
1140 }
1141
1142 void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu)
1143 {
1144 struct kvm_lapic *apic = vcpu->arch.apic;
1145
1146 apic->base_address = vcpu->arch.apic_base &
1147 MSR_IA32_APICBASE_BASE;
1148 kvm_apic_set_version(vcpu);
1149
1150 apic_update_ppr(apic);
1151 hrtimer_cancel(&apic->lapic_timer.timer);
1152 update_divide_count(apic);
1153 start_apic_timer(apic);
1154 apic->irr_pending = true;
1155 }
1156
1157 void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu)
1158 {
1159 struct kvm_lapic *apic = vcpu->arch.apic;
1160 struct hrtimer *timer;
1161
1162 if (!apic)
1163 return;
1164
1165 timer = &apic->lapic_timer.timer;
1166 if (hrtimer_cancel(timer))
1167 hrtimer_start_expires(timer, HRTIMER_MODE_ABS);
1168 }
1169
1170 void kvm_lapic_sync_from_vapic(struct kvm_vcpu *vcpu)
1171 {
1172 u32 data;
1173 void *vapic;
1174
1175 if (!irqchip_in_kernel(vcpu->kvm) || !vcpu->arch.apic->vapic_addr)
1176 return;
1177
1178 vapic = kmap_atomic(vcpu->arch.apic->vapic_page, KM_USER0);
1179 data = *(u32 *)(vapic + offset_in_page(vcpu->arch.apic->vapic_addr));
1180 kunmap_atomic(vapic, KM_USER0);
1181
1182 apic_set_tpr(vcpu->arch.apic, data & 0xff);
1183 }
1184
1185 void kvm_lapic_sync_to_vapic(struct kvm_vcpu *vcpu)
1186 {
1187 u32 data, tpr;
1188 int max_irr, max_isr;
1189 struct kvm_lapic *apic;
1190 void *vapic;
1191
1192 if (!irqchip_in_kernel(vcpu->kvm) || !vcpu->arch.apic->vapic_addr)
1193 return;
1194
1195 apic = vcpu->arch.apic;
1196 tpr = apic_get_reg(apic, APIC_TASKPRI) & 0xff;
1197 max_irr = apic_find_highest_irr(apic);
1198 if (max_irr < 0)
1199 max_irr = 0;
1200 max_isr = apic_find_highest_isr(apic);
1201 if (max_isr < 0)
1202 max_isr = 0;
1203 data = (tpr & 0xff) | ((max_isr & 0xf0) << 8) | (max_irr << 24);
1204
1205 vapic = kmap_atomic(vcpu->arch.apic->vapic_page, KM_USER0);
1206 *(u32 *)(vapic + offset_in_page(vcpu->arch.apic->vapic_addr)) = data;
1207 kunmap_atomic(vapic, KM_USER0);
1208 }
1209
1210 void kvm_lapic_set_vapic_addr(struct kvm_vcpu *vcpu, gpa_t vapic_addr)
1211 {
1212 if (!irqchip_in_kernel(vcpu->kvm))
1213 return;
1214
1215 vcpu->arch.apic->vapic_addr = vapic_addr;
1216 }
1217
1218 int kvm_x2apic_msr_write(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1219 {
1220 struct kvm_lapic *apic = vcpu->arch.apic;
1221 u32 reg = (msr - APIC_BASE_MSR) << 4;
1222
1223 if (!irqchip_in_kernel(vcpu->kvm) || !apic_x2apic_mode(apic))
1224 return 1;
1225
1226 /* if this is ICR write vector before command */
1227 if (msr == 0x830)
1228 apic_reg_write(apic, APIC_ICR2, (u32)(data >> 32));
1229 return apic_reg_write(apic, reg, (u32)data);
1230 }
1231
1232 int kvm_x2apic_msr_read(struct kvm_vcpu *vcpu, u32 msr, u64 *data)
1233 {
1234 struct kvm_lapic *apic = vcpu->arch.apic;
1235 u32 reg = (msr - APIC_BASE_MSR) << 4, low, high = 0;
1236
1237 if (!irqchip_in_kernel(vcpu->kvm) || !apic_x2apic_mode(apic))
1238 return 1;
1239
1240 if (apic_reg_read(apic, reg, 4, &low))
1241 return 1;
1242 if (msr == 0x830)
1243 apic_reg_read(apic, APIC_ICR2, 4, &high);
1244
1245 *data = (((u64)high) << 32) | low;
1246
1247 return 0;
1248 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree