Merge git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild
[linux-2.6] / drivers / 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 "kvm.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 <asm/processor.h>
29 #include <asm/msr.h>
30 #include <asm/page.h>
31 #include <asm/current.h>
32 #include <asm/apicdef.h>
33 #include <asm/atomic.h>
34 #include <asm/div64.h>
35 #include "irq.h"
36
37 #define PRId64 "d"
38 #define PRIx64 "llx"
39 #define PRIu64 "u"
40 #define PRIo64 "o"
41
42 #define APIC_BUS_CYCLE_NS 1
43
44 /* #define apic_debug(fmt,arg...) printk(KERN_WARNING fmt,##arg) */
45 #define apic_debug(fmt, arg...)
46
47 #define APIC_LVT_NUM                    6
48 /* 14 is the version for Xeon and Pentium 8.4.8*/
49 #define APIC_VERSION                    (0x14UL | ((APIC_LVT_NUM - 1) << 16))
50 #define LAPIC_MMIO_LENGTH               (1 << 12)
51 /* followed define is not in apicdef.h */
52 #define APIC_SHORT_MASK                 0xc0000
53 #define APIC_DEST_NOSHORT               0x0
54 #define APIC_DEST_MASK                  0x800
55 #define MAX_APIC_VECTOR                 256
56
57 #define VEC_POS(v) ((v) & (32 - 1))
58 #define REG_POS(v) (((v) >> 5) << 4)
59 static inline u32 apic_get_reg(struct kvm_lapic *apic, int reg_off)
60 {
61         return *((u32 *) (apic->regs + reg_off));
62 }
63
64 static inline void apic_set_reg(struct kvm_lapic *apic, int reg_off, u32 val)
65 {
66         *((u32 *) (apic->regs + reg_off)) = val;
67 }
68
69 static inline int apic_test_and_set_vector(int vec, void *bitmap)
70 {
71         return test_and_set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
72 }
73
74 static inline int apic_test_and_clear_vector(int vec, void *bitmap)
75 {
76         return test_and_clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
77 }
78
79 static inline void apic_set_vector(int vec, void *bitmap)
80 {
81         set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
82 }
83
84 static inline void apic_clear_vector(int vec, void *bitmap)
85 {
86         clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
87 }
88
89 static inline int apic_hw_enabled(struct kvm_lapic *apic)
90 {
91         return (apic)->vcpu->apic_base & MSR_IA32_APICBASE_ENABLE;
92 }
93
94 static inline int  apic_sw_enabled(struct kvm_lapic *apic)
95 {
96         return apic_get_reg(apic, APIC_SPIV) & APIC_SPIV_APIC_ENABLED;
97 }
98
99 static inline int apic_enabled(struct kvm_lapic *apic)
100 {
101         return apic_sw_enabled(apic) && apic_hw_enabled(apic);
102 }
103
104 #define LVT_MASK        \
105         (APIC_LVT_MASKED | APIC_SEND_PENDING | APIC_VECTOR_MASK)
106
107 #define LINT_MASK       \
108         (LVT_MASK | APIC_MODE_MASK | APIC_INPUT_POLARITY | \
109          APIC_LVT_REMOTE_IRR | APIC_LVT_LEVEL_TRIGGER)
110
111 static inline int kvm_apic_id(struct kvm_lapic *apic)
112 {
113         return (apic_get_reg(apic, APIC_ID) >> 24) & 0xff;
114 }
115
116 static inline int apic_lvt_enabled(struct kvm_lapic *apic, int lvt_type)
117 {
118         return !(apic_get_reg(apic, lvt_type) & APIC_LVT_MASKED);
119 }
120
121 static inline int apic_lvt_vector(struct kvm_lapic *apic, int lvt_type)
122 {
123         return apic_get_reg(apic, lvt_type) & APIC_VECTOR_MASK;
124 }
125
126 static inline int apic_lvtt_period(struct kvm_lapic *apic)
127 {
128         return apic_get_reg(apic, APIC_LVTT) & APIC_LVT_TIMER_PERIODIC;
129 }
130
131 static unsigned int apic_lvt_mask[APIC_LVT_NUM] = {
132         LVT_MASK | APIC_LVT_TIMER_PERIODIC,     /* LVTT */
133         LVT_MASK | APIC_MODE_MASK,      /* LVTTHMR */
134         LVT_MASK | APIC_MODE_MASK,      /* LVTPC */
135         LINT_MASK, LINT_MASK,   /* LVT0-1 */
136         LVT_MASK                /* LVTERR */
137 };
138
139 static int find_highest_vector(void *bitmap)
140 {
141         u32 *word = bitmap;
142         int word_offset = MAX_APIC_VECTOR >> 5;
143
144         while ((word_offset != 0) && (word[(--word_offset) << 2] == 0))
145                 continue;
146
147         if (likely(!word_offset && !word[0]))
148                 return -1;
149         else
150                 return fls(word[word_offset << 2]) - 1 + (word_offset << 5);
151 }
152
153 static inline int apic_test_and_set_irr(int vec, struct kvm_lapic *apic)
154 {
155         return apic_test_and_set_vector(vec, apic->regs + APIC_IRR);
156 }
157
158 static inline void apic_clear_irr(int vec, struct kvm_lapic *apic)
159 {
160         apic_clear_vector(vec, apic->regs + APIC_IRR);
161 }
162
163 static inline int apic_find_highest_irr(struct kvm_lapic *apic)
164 {
165         int result;
166
167         result = find_highest_vector(apic->regs + APIC_IRR);
168         ASSERT(result == -1 || result >= 16);
169
170         return result;
171 }
172
173 int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu)
174 {
175         struct kvm_lapic *apic = (struct kvm_lapic *)vcpu->apic;
176         int highest_irr;
177
178         if (!apic)
179                 return 0;
180         highest_irr = apic_find_highest_irr(apic);
181
182         return highest_irr;
183 }
184 EXPORT_SYMBOL_GPL(kvm_lapic_find_highest_irr);
185
186 int kvm_apic_set_irq(struct kvm_lapic *apic, u8 vec, u8 trig)
187 {
188         if (!apic_test_and_set_irr(vec, apic)) {
189                 /* a new pending irq is set in IRR */
190                 if (trig)
191                         apic_set_vector(vec, apic->regs + APIC_TMR);
192                 else
193                         apic_clear_vector(vec, apic->regs + APIC_TMR);
194                 kvm_vcpu_kick(apic->vcpu);
195                 return 1;
196         }
197         return 0;
198 }
199
200 static inline int apic_find_highest_isr(struct kvm_lapic *apic)
201 {
202         int result;
203
204         result = find_highest_vector(apic->regs + APIC_ISR);
205         ASSERT(result == -1 || result >= 16);
206
207         return result;
208 }
209
210 static void apic_update_ppr(struct kvm_lapic *apic)
211 {
212         u32 tpr, isrv, ppr;
213         int isr;
214
215         tpr = apic_get_reg(apic, APIC_TASKPRI);
216         isr = apic_find_highest_isr(apic);
217         isrv = (isr != -1) ? isr : 0;
218
219         if ((tpr & 0xf0) >= (isrv & 0xf0))
220                 ppr = tpr & 0xff;
221         else
222                 ppr = isrv & 0xf0;
223
224         apic_debug("vlapic %p, ppr 0x%x, isr 0x%x, isrv 0x%x",
225                    apic, ppr, isr, isrv);
226
227         apic_set_reg(apic, APIC_PROCPRI, ppr);
228 }
229
230 static void apic_set_tpr(struct kvm_lapic *apic, u32 tpr)
231 {
232         apic_set_reg(apic, APIC_TASKPRI, tpr);
233         apic_update_ppr(apic);
234 }
235
236 int kvm_apic_match_physical_addr(struct kvm_lapic *apic, u16 dest)
237 {
238         return kvm_apic_id(apic) == dest;
239 }
240
241 int kvm_apic_match_logical_addr(struct kvm_lapic *apic, u8 mda)
242 {
243         int result = 0;
244         u8 logical_id;
245
246         logical_id = GET_APIC_LOGICAL_ID(apic_get_reg(apic, APIC_LDR));
247
248         switch (apic_get_reg(apic, APIC_DFR)) {
249         case APIC_DFR_FLAT:
250                 if (logical_id & mda)
251                         result = 1;
252                 break;
253         case APIC_DFR_CLUSTER:
254                 if (((logical_id >> 4) == (mda >> 0x4))
255                     && (logical_id & mda & 0xf))
256                         result = 1;
257                 break;
258         default:
259                 printk(KERN_WARNING "Bad DFR vcpu %d: %08x\n",
260                        apic->vcpu->vcpu_id, apic_get_reg(apic, APIC_DFR));
261                 break;
262         }
263
264         return result;
265 }
266
267 static int apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
268                            int short_hand, int dest, int dest_mode)
269 {
270         int result = 0;
271         struct kvm_lapic *target = vcpu->apic;
272
273         apic_debug("target %p, source %p, dest 0x%x, "
274                    "dest_mode 0x%x, short_hand 0x%x",
275                    target, source, dest, dest_mode, short_hand);
276
277         ASSERT(!target);
278         switch (short_hand) {
279         case APIC_DEST_NOSHORT:
280                 if (dest_mode == 0) {
281                         /* Physical mode. */
282                         if ((dest == 0xFF) || (dest == kvm_apic_id(target)))
283                                 result = 1;
284                 } else
285                         /* Logical mode. */
286                         result = kvm_apic_match_logical_addr(target, dest);
287                 break;
288         case APIC_DEST_SELF:
289                 if (target == source)
290                         result = 1;
291                 break;
292         case APIC_DEST_ALLINC:
293                 result = 1;
294                 break;
295         case APIC_DEST_ALLBUT:
296                 if (target != source)
297                         result = 1;
298                 break;
299         default:
300                 printk(KERN_WARNING "Bad dest shorthand value %x\n",
301                        short_hand);
302                 break;
303         }
304
305         return result;
306 }
307
308 /*
309  * Add a pending IRQ into lapic.
310  * Return 1 if successfully added and 0 if discarded.
311  */
312 static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
313                              int vector, int level, int trig_mode)
314 {
315         int orig_irr, result = 0;
316         struct kvm_vcpu *vcpu = apic->vcpu;
317
318         switch (delivery_mode) {
319         case APIC_DM_FIXED:
320         case APIC_DM_LOWEST:
321                 /* FIXME add logic for vcpu on reset */
322                 if (unlikely(!apic_enabled(apic)))
323                         break;
324
325                 orig_irr = apic_test_and_set_irr(vector, apic);
326                 if (orig_irr && trig_mode) {
327                         apic_debug("level trig mode repeatedly for vector %d",
328                                    vector);
329                         break;
330                 }
331
332                 if (trig_mode) {
333                         apic_debug("level trig mode for vector %d", vector);
334                         apic_set_vector(vector, apic->regs + APIC_TMR);
335                 } else
336                         apic_clear_vector(vector, apic->regs + APIC_TMR);
337
338                 if (vcpu->mp_state == VCPU_MP_STATE_RUNNABLE)
339                         kvm_vcpu_kick(vcpu);
340                 else if (vcpu->mp_state == VCPU_MP_STATE_HALTED) {
341                         vcpu->mp_state = VCPU_MP_STATE_RUNNABLE;
342                         if (waitqueue_active(&vcpu->wq))
343                                 wake_up_interruptible(&vcpu->wq);
344                 }
345
346                 result = (orig_irr == 0);
347                 break;
348
349         case APIC_DM_REMRD:
350                 printk(KERN_DEBUG "Ignoring delivery mode 3\n");
351                 break;
352
353         case APIC_DM_SMI:
354                 printk(KERN_DEBUG "Ignoring guest SMI\n");
355                 break;
356         case APIC_DM_NMI:
357                 printk(KERN_DEBUG "Ignoring guest NMI\n");
358                 break;
359
360         case APIC_DM_INIT:
361                 if (level) {
362                         if (vcpu->mp_state == VCPU_MP_STATE_RUNNABLE)
363                                 printk(KERN_DEBUG
364                                        "INIT on a runnable vcpu %d\n",
365                                        vcpu->vcpu_id);
366                         vcpu->mp_state = VCPU_MP_STATE_INIT_RECEIVED;
367                         kvm_vcpu_kick(vcpu);
368                 } else {
369                         printk(KERN_DEBUG
370                                "Ignoring de-assert INIT to vcpu %d\n",
371                                vcpu->vcpu_id);
372                 }
373
374                 break;
375
376         case APIC_DM_STARTUP:
377                 printk(KERN_DEBUG "SIPI to vcpu %d vector 0x%02x\n",
378                        vcpu->vcpu_id, vector);
379                 if (vcpu->mp_state == VCPU_MP_STATE_INIT_RECEIVED) {
380                         vcpu->sipi_vector = vector;
381                         vcpu->mp_state = VCPU_MP_STATE_SIPI_RECEIVED;
382                         if (waitqueue_active(&vcpu->wq))
383                                 wake_up_interruptible(&vcpu->wq);
384                 }
385                 break;
386
387         default:
388                 printk(KERN_ERR "TODO: unsupported delivery mode %x\n",
389                        delivery_mode);
390                 break;
391         }
392         return result;
393 }
394
395 struct kvm_lapic *kvm_apic_round_robin(struct kvm *kvm, u8 vector,
396                                        unsigned long bitmap)
397 {
398         int vcpu_id;
399         int last;
400         int next;
401         struct kvm_lapic *apic;
402
403         last = kvm->round_robin_prev_vcpu;
404         next = last;
405
406         do {
407                 if (++next == KVM_MAX_VCPUS)
408                         next = 0;
409                 if (kvm->vcpus[next] == NULL || !test_bit(next, &bitmap))
410                         continue;
411                 apic = kvm->vcpus[next]->apic;
412                 if (apic && apic_enabled(apic))
413                         break;
414                 apic = NULL;
415         } while (next != last);
416         kvm->round_robin_prev_vcpu = next;
417
418         if (!apic) {
419                 vcpu_id = ffs(bitmap) - 1;
420                 if (vcpu_id < 0) {
421                         vcpu_id = 0;
422                         printk(KERN_DEBUG "vcpu not ready for apic_round_robin\n");
423                 }
424                 apic = kvm->vcpus[vcpu_id]->apic;
425         }
426
427         return apic;
428 }
429
430 static void apic_set_eoi(struct kvm_lapic *apic)
431 {
432         int vector = apic_find_highest_isr(apic);
433
434         /*
435          * Not every write EOI will has corresponding ISR,
436          * one example is when Kernel check timer on setup_IO_APIC
437          */
438         if (vector == -1)
439                 return;
440
441         apic_clear_vector(vector, apic->regs + APIC_ISR);
442         apic_update_ppr(apic);
443
444         if (apic_test_and_clear_vector(vector, apic->regs + APIC_TMR))
445                 kvm_ioapic_update_eoi(apic->vcpu->kvm, vector);
446 }
447
448 static void apic_send_ipi(struct kvm_lapic *apic)
449 {
450         u32 icr_low = apic_get_reg(apic, APIC_ICR);
451         u32 icr_high = apic_get_reg(apic, APIC_ICR2);
452
453         unsigned int dest = GET_APIC_DEST_FIELD(icr_high);
454         unsigned int short_hand = icr_low & APIC_SHORT_MASK;
455         unsigned int trig_mode = icr_low & APIC_INT_LEVELTRIG;
456         unsigned int level = icr_low & APIC_INT_ASSERT;
457         unsigned int dest_mode = icr_low & APIC_DEST_MASK;
458         unsigned int delivery_mode = icr_low & APIC_MODE_MASK;
459         unsigned int vector = icr_low & APIC_VECTOR_MASK;
460
461         struct kvm_lapic *target;
462         struct kvm_vcpu *vcpu;
463         unsigned long lpr_map = 0;
464         int i;
465
466         apic_debug("icr_high 0x%x, icr_low 0x%x, "
467                    "short_hand 0x%x, dest 0x%x, trig_mode 0x%x, level 0x%x, "
468                    "dest_mode 0x%x, delivery_mode 0x%x, vector 0x%x\n",
469                    icr_high, icr_low, short_hand, dest,
470                    trig_mode, level, dest_mode, delivery_mode, vector);
471
472         for (i = 0; i < KVM_MAX_VCPUS; i++) {
473                 vcpu = apic->vcpu->kvm->vcpus[i];
474                 if (!vcpu)
475                         continue;
476
477                 if (vcpu->apic &&
478                     apic_match_dest(vcpu, apic, short_hand, dest, dest_mode)) {
479                         if (delivery_mode == APIC_DM_LOWEST)
480                                 set_bit(vcpu->vcpu_id, &lpr_map);
481                         else
482                                 __apic_accept_irq(vcpu->apic, delivery_mode,
483                                                   vector, level, trig_mode);
484                 }
485         }
486
487         if (delivery_mode == APIC_DM_LOWEST) {
488                 target = kvm_apic_round_robin(vcpu->kvm, vector, lpr_map);
489                 if (target != NULL)
490                         __apic_accept_irq(target, delivery_mode,
491                                           vector, level, trig_mode);
492         }
493 }
494
495 static u32 apic_get_tmcct(struct kvm_lapic *apic)
496 {
497         u32 counter_passed;
498         ktime_t passed, now = apic->timer.dev.base->get_time();
499         u32 tmcct = apic_get_reg(apic, APIC_TMICT);
500
501         ASSERT(apic != NULL);
502
503         if (unlikely(ktime_to_ns(now) <=
504                 ktime_to_ns(apic->timer.last_update))) {
505                 /* Wrap around */
506                 passed = ktime_add(( {
507                                     (ktime_t) {
508                                     .tv64 = KTIME_MAX -
509                                     (apic->timer.last_update).tv64}; }
510                                    ), now);
511                 apic_debug("time elapsed\n");
512         } else
513                 passed = ktime_sub(now, apic->timer.last_update);
514
515         counter_passed = div64_64(ktime_to_ns(passed),
516                                   (APIC_BUS_CYCLE_NS * apic->timer.divide_count));
517         tmcct -= counter_passed;
518
519         if (tmcct <= 0) {
520                 if (unlikely(!apic_lvtt_period(apic)))
521                         tmcct = 0;
522                 else
523                         do {
524                                 tmcct += apic_get_reg(apic, APIC_TMICT);
525                         } while (tmcct <= 0);
526         }
527
528         return tmcct;
529 }
530
531 static u32 __apic_read(struct kvm_lapic *apic, unsigned int offset)
532 {
533         u32 val = 0;
534
535         if (offset >= LAPIC_MMIO_LENGTH)
536                 return 0;
537
538         switch (offset) {
539         case APIC_ARBPRI:
540                 printk(KERN_WARNING "Access APIC ARBPRI register "
541                        "which is for P6\n");
542                 break;
543
544         case APIC_TMCCT:        /* Timer CCR */
545                 val = apic_get_tmcct(apic);
546                 break;
547
548         default:
549                 apic_update_ppr(apic);
550                 val = apic_get_reg(apic, offset);
551                 break;
552         }
553
554         return val;
555 }
556
557 static void apic_mmio_read(struct kvm_io_device *this,
558                            gpa_t address, int len, void *data)
559 {
560         struct kvm_lapic *apic = (struct kvm_lapic *)this->private;
561         unsigned int offset = address - apic->base_address;
562         unsigned char alignment = offset & 0xf;
563         u32 result;
564
565         if ((alignment + len) > 4) {
566                 printk(KERN_ERR "KVM_APIC_READ: alignment error %lx %d",
567                        (unsigned long)address, len);
568                 return;
569         }
570         result = __apic_read(apic, offset & ~0xf);
571
572         switch (len) {
573         case 1:
574         case 2:
575         case 4:
576                 memcpy(data, (char *)&result + alignment, len);
577                 break;
578         default:
579                 printk(KERN_ERR "Local APIC read with len = %x, "
580                        "should be 1,2, or 4 instead\n", len);
581                 break;
582         }
583 }
584
585 static void update_divide_count(struct kvm_lapic *apic)
586 {
587         u32 tmp1, tmp2, tdcr;
588
589         tdcr = apic_get_reg(apic, APIC_TDCR);
590         tmp1 = tdcr & 0xf;
591         tmp2 = ((tmp1 & 0x3) | ((tmp1 & 0x8) >> 1)) + 1;
592         apic->timer.divide_count = 0x1 << (tmp2 & 0x7);
593
594         apic_debug("timer divide count is 0x%x\n",
595                                    apic->timer.divide_count);
596 }
597
598 static void start_apic_timer(struct kvm_lapic *apic)
599 {
600         ktime_t now = apic->timer.dev.base->get_time();
601
602         apic->timer.last_update = now;
603
604         apic->timer.period = apic_get_reg(apic, APIC_TMICT) *
605                     APIC_BUS_CYCLE_NS * apic->timer.divide_count;
606         atomic_set(&apic->timer.pending, 0);
607         hrtimer_start(&apic->timer.dev,
608                       ktime_add_ns(now, apic->timer.period),
609                       HRTIMER_MODE_ABS);
610
611         apic_debug("%s: bus cycle is %" PRId64 "ns, now 0x%016"
612                            PRIx64 ", "
613                            "timer initial count 0x%x, period %lldns, "
614                            "expire @ 0x%016" PRIx64 ".\n", __FUNCTION__,
615                            APIC_BUS_CYCLE_NS, ktime_to_ns(now),
616                            apic_get_reg(apic, APIC_TMICT),
617                            apic->timer.period,
618                            ktime_to_ns(ktime_add_ns(now,
619                                         apic->timer.period)));
620 }
621
622 static void apic_mmio_write(struct kvm_io_device *this,
623                             gpa_t address, int len, const void *data)
624 {
625         struct kvm_lapic *apic = (struct kvm_lapic *)this->private;
626         unsigned int offset = address - apic->base_address;
627         unsigned char alignment = offset & 0xf;
628         u32 val;
629
630         /*
631          * APIC register must be aligned on 128-bits boundary.
632          * 32/64/128 bits registers must be accessed thru 32 bits.
633          * Refer SDM 8.4.1
634          */
635         if (len != 4 || alignment) {
636                 if (printk_ratelimit())
637                         printk(KERN_ERR "apic write: bad size=%d %lx\n",
638                                len, (long)address);
639                 return;
640         }
641
642         val = *(u32 *) data;
643
644         /* too common printing */
645         if (offset != APIC_EOI)
646                 apic_debug("%s: offset 0x%x with length 0x%x, and value is "
647                            "0x%x\n", __FUNCTION__, offset, len, val);
648
649         offset &= 0xff0;
650
651         switch (offset) {
652         case APIC_ID:           /* Local APIC ID */
653                 apic_set_reg(apic, APIC_ID, val);
654                 break;
655
656         case APIC_TASKPRI:
657                 apic_set_tpr(apic, val & 0xff);
658                 break;
659
660         case APIC_EOI:
661                 apic_set_eoi(apic);
662                 break;
663
664         case APIC_LDR:
665                 apic_set_reg(apic, APIC_LDR, val & APIC_LDR_MASK);
666                 break;
667
668         case APIC_DFR:
669                 apic_set_reg(apic, APIC_DFR, val | 0x0FFFFFFF);
670                 break;
671
672         case APIC_SPIV:
673                 apic_set_reg(apic, APIC_SPIV, val & 0x3ff);
674                 if (!(val & APIC_SPIV_APIC_ENABLED)) {
675                         int i;
676                         u32 lvt_val;
677
678                         for (i = 0; i < APIC_LVT_NUM; i++) {
679                                 lvt_val = apic_get_reg(apic,
680                                                        APIC_LVTT + 0x10 * i);
681                                 apic_set_reg(apic, APIC_LVTT + 0x10 * i,
682                                              lvt_val | APIC_LVT_MASKED);
683                         }
684                         atomic_set(&apic->timer.pending, 0);
685
686                 }
687                 break;
688
689         case APIC_ICR:
690                 /* No delay here, so we always clear the pending bit */
691                 apic_set_reg(apic, APIC_ICR, val & ~(1 << 12));
692                 apic_send_ipi(apic);
693                 break;
694
695         case APIC_ICR2:
696                 apic_set_reg(apic, APIC_ICR2, val & 0xff000000);
697                 break;
698
699         case APIC_LVTT:
700         case APIC_LVTTHMR:
701         case APIC_LVTPC:
702         case APIC_LVT0:
703         case APIC_LVT1:
704         case APIC_LVTERR:
705                 /* TODO: Check vector */
706                 if (!apic_sw_enabled(apic))
707                         val |= APIC_LVT_MASKED;
708
709                 val &= apic_lvt_mask[(offset - APIC_LVTT) >> 4];
710                 apic_set_reg(apic, offset, val);
711
712                 break;
713
714         case APIC_TMICT:
715                 hrtimer_cancel(&apic->timer.dev);
716                 apic_set_reg(apic, APIC_TMICT, val);
717                 start_apic_timer(apic);
718                 return;
719
720         case APIC_TDCR:
721                 if (val & 4)
722                         printk(KERN_ERR "KVM_WRITE:TDCR %x\n", val);
723                 apic_set_reg(apic, APIC_TDCR, val);
724                 update_divide_count(apic);
725                 break;
726
727         default:
728                 apic_debug("Local APIC Write to read-only register %x\n",
729                            offset);
730                 break;
731         }
732
733 }
734
735 static int apic_mmio_range(struct kvm_io_device *this, gpa_t addr)
736 {
737         struct kvm_lapic *apic = (struct kvm_lapic *)this->private;
738         int ret = 0;
739
740
741         if (apic_hw_enabled(apic) &&
742             (addr >= apic->base_address) &&
743             (addr < (apic->base_address + LAPIC_MMIO_LENGTH)))
744                 ret = 1;
745
746         return ret;
747 }
748
749 void kvm_free_apic(struct kvm_lapic *apic)
750 {
751         if (!apic)
752                 return;
753
754         hrtimer_cancel(&apic->timer.dev);
755
756         if (apic->regs_page) {
757                 __free_page(apic->regs_page);
758                 apic->regs_page = 0;
759         }
760
761         kfree(apic);
762 }
763
764 /*
765  *----------------------------------------------------------------------
766  * LAPIC interface
767  *----------------------------------------------------------------------
768  */
769
770 void kvm_lapic_set_tpr(struct kvm_vcpu *vcpu, unsigned long cr8)
771 {
772         struct kvm_lapic *apic = (struct kvm_lapic *)vcpu->apic;
773
774         if (!apic)
775                 return;
776         apic_set_tpr(apic, ((cr8 & 0x0f) << 4));
777 }
778
779 u64 kvm_lapic_get_cr8(struct kvm_vcpu *vcpu)
780 {
781         struct kvm_lapic *apic = (struct kvm_lapic *)vcpu->apic;
782         u64 tpr;
783
784         if (!apic)
785                 return 0;
786         tpr = (u64) apic_get_reg(apic, APIC_TASKPRI);
787
788         return (tpr & 0xf0) >> 4;
789 }
790 EXPORT_SYMBOL_GPL(kvm_lapic_get_cr8);
791
792 void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value)
793 {
794         struct kvm_lapic *apic = (struct kvm_lapic *)vcpu->apic;
795
796         if (!apic) {
797                 value |= MSR_IA32_APICBASE_BSP;
798                 vcpu->apic_base = value;
799                 return;
800         }
801         if (apic->vcpu->vcpu_id)
802                 value &= ~MSR_IA32_APICBASE_BSP;
803
804         vcpu->apic_base = value;
805         apic->base_address = apic->vcpu->apic_base &
806                              MSR_IA32_APICBASE_BASE;
807
808         /* with FSB delivery interrupt, we can restart APIC functionality */
809         apic_debug("apic base msr is 0x%016" PRIx64 ", and base address is "
810                    "0x%lx.\n", apic->apic_base, apic->base_address);
811
812 }
813
814 u64 kvm_lapic_get_base(struct kvm_vcpu *vcpu)
815 {
816         return vcpu->apic_base;
817 }
818 EXPORT_SYMBOL_GPL(kvm_lapic_get_base);
819
820 void kvm_lapic_reset(struct kvm_vcpu *vcpu)
821 {
822         struct kvm_lapic *apic;
823         int i;
824
825         apic_debug("%s\n", __FUNCTION__);
826
827         ASSERT(vcpu);
828         apic = vcpu->apic;
829         ASSERT(apic != NULL);
830
831         /* Stop the timer in case it's a reset to an active apic */
832         hrtimer_cancel(&apic->timer.dev);
833
834         apic_set_reg(apic, APIC_ID, vcpu->vcpu_id << 24);
835         apic_set_reg(apic, APIC_LVR, APIC_VERSION);
836
837         for (i = 0; i < APIC_LVT_NUM; i++)
838                 apic_set_reg(apic, APIC_LVTT + 0x10 * i, APIC_LVT_MASKED);
839         apic_set_reg(apic, APIC_LVT0,
840                      SET_APIC_DELIVERY_MODE(0, APIC_MODE_EXTINT));
841
842         apic_set_reg(apic, APIC_DFR, 0xffffffffU);
843         apic_set_reg(apic, APIC_SPIV, 0xff);
844         apic_set_reg(apic, APIC_TASKPRI, 0);
845         apic_set_reg(apic, APIC_LDR, 0);
846         apic_set_reg(apic, APIC_ESR, 0);
847         apic_set_reg(apic, APIC_ICR, 0);
848         apic_set_reg(apic, APIC_ICR2, 0);
849         apic_set_reg(apic, APIC_TDCR, 0);
850         apic_set_reg(apic, APIC_TMICT, 0);
851         for (i = 0; i < 8; i++) {
852                 apic_set_reg(apic, APIC_IRR + 0x10 * i, 0);
853                 apic_set_reg(apic, APIC_ISR + 0x10 * i, 0);
854                 apic_set_reg(apic, APIC_TMR + 0x10 * i, 0);
855         }
856         apic->timer.divide_count = 0;
857         atomic_set(&apic->timer.pending, 0);
858         if (vcpu->vcpu_id == 0)
859                 vcpu->apic_base |= MSR_IA32_APICBASE_BSP;
860         apic_update_ppr(apic);
861
862         apic_debug(KERN_INFO "%s: vcpu=%p, id=%d, base_msr="
863                    "0x%016" PRIx64 ", base_address=0x%0lx.\n", __FUNCTION__,
864                    vcpu, kvm_apic_id(apic),
865                    vcpu->apic_base, apic->base_address);
866 }
867 EXPORT_SYMBOL_GPL(kvm_lapic_reset);
868
869 int kvm_lapic_enabled(struct kvm_vcpu *vcpu)
870 {
871         struct kvm_lapic *apic = (struct kvm_lapic *)vcpu->apic;
872         int ret = 0;
873
874         if (!apic)
875                 return 0;
876         ret = apic_enabled(apic);
877
878         return ret;
879 }
880 EXPORT_SYMBOL_GPL(kvm_lapic_enabled);
881
882 /*
883  *----------------------------------------------------------------------
884  * timer interface
885  *----------------------------------------------------------------------
886  */
887
888 /* TODO: make sure __apic_timer_fn runs in current pCPU */
889 static int __apic_timer_fn(struct kvm_lapic *apic)
890 {
891         int result = 0;
892         wait_queue_head_t *q = &apic->vcpu->wq;
893
894         atomic_inc(&apic->timer.pending);
895         if (waitqueue_active(q))
896         {
897                 apic->vcpu->mp_state = VCPU_MP_STATE_RUNNABLE;
898                 wake_up_interruptible(q);
899         }
900         if (apic_lvtt_period(apic)) {
901                 result = 1;
902                 apic->timer.dev.expires = ktime_add_ns(
903                                         apic->timer.dev.expires,
904                                         apic->timer.period);
905         }
906         return result;
907 }
908
909 static int __inject_apic_timer_irq(struct kvm_lapic *apic)
910 {
911         int vector;
912
913         vector = apic_lvt_vector(apic, APIC_LVTT);
914         return __apic_accept_irq(apic, APIC_DM_FIXED, vector, 1, 0);
915 }
916
917 static enum hrtimer_restart apic_timer_fn(struct hrtimer *data)
918 {
919         struct kvm_lapic *apic;
920         int restart_timer = 0;
921
922         apic = container_of(data, struct kvm_lapic, timer.dev);
923
924         restart_timer = __apic_timer_fn(apic);
925
926         if (restart_timer)
927                 return HRTIMER_RESTART;
928         else
929                 return HRTIMER_NORESTART;
930 }
931
932 int kvm_create_lapic(struct kvm_vcpu *vcpu)
933 {
934         struct kvm_lapic *apic;
935
936         ASSERT(vcpu != NULL);
937         apic_debug("apic_init %d\n", vcpu->vcpu_id);
938
939         apic = kzalloc(sizeof(*apic), GFP_KERNEL);
940         if (!apic)
941                 goto nomem;
942
943         vcpu->apic = apic;
944
945         apic->regs_page = alloc_page(GFP_KERNEL);
946         if (apic->regs_page == NULL) {
947                 printk(KERN_ERR "malloc apic regs error for vcpu %x\n",
948                        vcpu->vcpu_id);
949                 goto nomem;
950         }
951         apic->regs = page_address(apic->regs_page);
952         memset(apic->regs, 0, PAGE_SIZE);
953         apic->vcpu = vcpu;
954
955         hrtimer_init(&apic->timer.dev, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
956         apic->timer.dev.function = apic_timer_fn;
957         apic->base_address = APIC_DEFAULT_PHYS_BASE;
958         vcpu->apic_base = APIC_DEFAULT_PHYS_BASE;
959
960         kvm_lapic_reset(vcpu);
961         apic->dev.read = apic_mmio_read;
962         apic->dev.write = apic_mmio_write;
963         apic->dev.in_range = apic_mmio_range;
964         apic->dev.private = apic;
965
966         return 0;
967 nomem:
968         kvm_free_apic(apic);
969         return -ENOMEM;
970 }
971 EXPORT_SYMBOL_GPL(kvm_create_lapic);
972
973 int kvm_apic_has_interrupt(struct kvm_vcpu *vcpu)
974 {
975         struct kvm_lapic *apic = vcpu->apic;
976         int highest_irr;
977
978         if (!apic || !apic_enabled(apic))
979                 return -1;
980
981         apic_update_ppr(apic);
982         highest_irr = apic_find_highest_irr(apic);
983         if ((highest_irr == -1) ||
984             ((highest_irr & 0xF0) <= apic_get_reg(apic, APIC_PROCPRI)))
985                 return -1;
986         return highest_irr;
987 }
988
989 int kvm_apic_accept_pic_intr(struct kvm_vcpu *vcpu)
990 {
991         u32 lvt0 = apic_get_reg(vcpu->apic, APIC_LVT0);
992         int r = 0;
993
994         if (vcpu->vcpu_id == 0) {
995                 if (!apic_hw_enabled(vcpu->apic))
996                         r = 1;
997                 if ((lvt0 & APIC_LVT_MASKED) == 0 &&
998                     GET_APIC_DELIVERY_MODE(lvt0) == APIC_MODE_EXTINT)
999                         r = 1;
1000         }
1001         return r;
1002 }
1003
1004 void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu)
1005 {
1006         struct kvm_lapic *apic = vcpu->apic;
1007
1008         if (apic && apic_lvt_enabled(apic, APIC_LVTT) &&
1009                 atomic_read(&apic->timer.pending) > 0) {
1010                 if (__inject_apic_timer_irq(apic))
1011                         atomic_dec(&apic->timer.pending);
1012         }
1013 }
1014
1015 void kvm_apic_timer_intr_post(struct kvm_vcpu *vcpu, int vec)
1016 {
1017         struct kvm_lapic *apic = vcpu->apic;
1018
1019         if (apic && apic_lvt_vector(apic, APIC_LVTT) == vec)
1020                 apic->timer.last_update = ktime_add_ns(
1021                                 apic->timer.last_update,
1022                                 apic->timer.period);
1023 }
1024
1025 int kvm_get_apic_interrupt(struct kvm_vcpu *vcpu)
1026 {
1027         int vector = kvm_apic_has_interrupt(vcpu);
1028         struct kvm_lapic *apic = vcpu->apic;
1029
1030         if (vector == -1)
1031                 return -1;
1032
1033         apic_set_vector(vector, apic->regs + APIC_ISR);
1034         apic_update_ppr(apic);
1035         apic_clear_irr(vector, apic);
1036         return vector;
1037 }
1038
1039 void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu)
1040 {
1041         struct kvm_lapic *apic = vcpu->apic;
1042
1043         apic->base_address = vcpu->apic_base &
1044                              MSR_IA32_APICBASE_BASE;
1045         apic_set_reg(apic, APIC_LVR, APIC_VERSION);
1046         apic_update_ppr(apic);
1047         hrtimer_cancel(&apic->timer.dev);
1048         update_divide_count(apic);
1049         start_apic_timer(apic);
1050 }
1051
1052 void kvm_migrate_apic_timer(struct kvm_vcpu *vcpu)
1053 {
1054         struct kvm_lapic *apic = vcpu->apic;
1055         struct hrtimer *timer;
1056
1057         if (!apic)
1058                 return;
1059
1060         timer = &apic->timer.dev;
1061         if (hrtimer_cancel(timer))
1062                 hrtimer_start(timer, timer->expires, HRTIMER_MODE_ABS);
1063 }
1064 EXPORT_SYMBOL_GPL(kvm_migrate_apic_timer);