3 * Local APIC virtualization
5 * Copyright (C) 2006 Qumranet, Inc.
6 * Copyright (C) 2007 Novell
7 * Copyright (C) 2007 Intel
8 * Copyright 2009 Red Hat, Inc. and/or its affiliates.
11 * Dor Laor <dor.laor@qumranet.com>
12 * Gregory Haskins <ghaskins@novell.com>
13 * Yaozu (Eddie) Dong <eddie.dong@intel.com>
15 * Based on Xen 3.1 code, Copyright (c) 2004, Intel Corporation.
17 * This work is licensed under the terms of the GNU GPL, version 2. See
18 * the COPYING file in the top-level directory.
21 #include <linux/kvm_host.h>
22 #include <linux/kvm.h>
24 #include <linux/highmem.h>
25 #include <linux/smp.h>
26 #include <linux/hrtimer.h>
28 #include <linux/module.h>
29 #include <linux/math64.h>
30 #include <linux/slab.h>
31 #include <asm/processor.h>
34 #include <asm/current.h>
35 #include <asm/apicdef.h>
36 #include <asm/delay.h>
37 #include <linux/atomic.h>
38 #include <linux/jump_label.h>
39 #include "kvm_cache_regs.h"
47 #define mod_64(x, y) ((x) - (y) * div64_u64(x, y))
49 #define mod_64(x, y) ((x) % (y))
57 #define APIC_BUS_CYCLE_NS 1
59 /* #define apic_debug(fmt,arg...) printk(KERN_WARNING fmt,##arg) */
60 #define apic_debug(fmt, arg...)
62 #define APIC_LVT_NUM 6
63 /* 14 is the version for Xeon and Pentium 8.4.8*/
64 #define APIC_VERSION (0x14UL | ((APIC_LVT_NUM - 1) << 16))
65 #define LAPIC_MMIO_LENGTH (1 << 12)
66 /* followed define is not in apicdef.h */
67 #define APIC_SHORT_MASK 0xc0000
68 #define APIC_DEST_NOSHORT 0x0
69 #define APIC_DEST_MASK 0x800
70 #define MAX_APIC_VECTOR 256
71 #define APIC_VECTORS_PER_REG 32
73 #define APIC_BROADCAST 0xFF
74 #define X2APIC_BROADCAST 0xFFFFFFFFul
76 #define VEC_POS(v) ((v) & (32 - 1))
77 #define REG_POS(v) (((v) >> 5) << 4)
79 static inline void apic_set_reg(struct kvm_lapic
*apic
, int reg_off
, u32 val
)
81 *((u32
*) (apic
->regs
+ reg_off
)) = val
;
84 static inline int apic_test_vector(int vec
, void *bitmap
)
86 return test_bit(VEC_POS(vec
), (bitmap
) + REG_POS(vec
));
89 bool kvm_apic_pending_eoi(struct kvm_vcpu
*vcpu
, int vector
)
91 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
93 return apic_test_vector(vector
, apic
->regs
+ APIC_ISR
) ||
94 apic_test_vector(vector
, apic
->regs
+ APIC_IRR
);
97 static inline void apic_set_vector(int vec
, void *bitmap
)
99 set_bit(VEC_POS(vec
), (bitmap
) + REG_POS(vec
));
102 static inline void apic_clear_vector(int vec
, void *bitmap
)
104 clear_bit(VEC_POS(vec
), (bitmap
) + REG_POS(vec
));
107 static inline int __apic_test_and_set_vector(int vec
, void *bitmap
)
109 return __test_and_set_bit(VEC_POS(vec
), (bitmap
) + REG_POS(vec
));
112 static inline int __apic_test_and_clear_vector(int vec
, void *bitmap
)
114 return __test_and_clear_bit(VEC_POS(vec
), (bitmap
) + REG_POS(vec
));
117 struct static_key_deferred apic_hw_disabled __read_mostly
;
118 struct static_key_deferred apic_sw_disabled __read_mostly
;
120 static inline int apic_enabled(struct kvm_lapic
*apic
)
122 return kvm_apic_sw_enabled(apic
) && kvm_apic_hw_enabled(apic
);
126 (APIC_LVT_MASKED | APIC_SEND_PENDING | APIC_VECTOR_MASK)
129 (LVT_MASK | APIC_MODE_MASK | APIC_INPUT_POLARITY | \
130 APIC_LVT_REMOTE_IRR | APIC_LVT_LEVEL_TRIGGER)
132 /* The logical map is definitely wrong if we have multiple
133 * modes at the same time. (Physical map is always right.)
135 static inline bool kvm_apic_logical_map_valid(struct kvm_apic_map
*map
)
137 return !(map
->mode
& (map
->mode
- 1));
141 apic_logical_id(struct kvm_apic_map
*map
, u32 dest_id
, u16
*cid
, u16
*lid
)
145 BUILD_BUG_ON(KVM_APIC_MODE_XAPIC_CLUSTER
!= 4);
146 BUILD_BUG_ON(KVM_APIC_MODE_XAPIC_FLAT
!= 8);
147 BUILD_BUG_ON(KVM_APIC_MODE_X2APIC
!= 16);
148 lid_bits
= map
->mode
;
150 *cid
= dest_id
>> lid_bits
;
151 *lid
= dest_id
& ((1 << lid_bits
) - 1);
154 static void recalculate_apic_map(struct kvm
*kvm
)
156 struct kvm_apic_map
*new, *old
= NULL
;
157 struct kvm_vcpu
*vcpu
;
160 new = kzalloc(sizeof(struct kvm_apic_map
), GFP_KERNEL
);
162 mutex_lock(&kvm
->arch
.apic_map_lock
);
167 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
168 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
172 if (!kvm_apic_present(vcpu
))
175 aid
= kvm_apic_id(apic
);
176 ldr
= kvm_apic_get_reg(apic
, APIC_LDR
);
178 if (aid
< ARRAY_SIZE(new->phys_map
))
179 new->phys_map
[aid
] = apic
;
181 if (apic_x2apic_mode(apic
)) {
182 new->mode
|= KVM_APIC_MODE_X2APIC
;
184 ldr
= GET_APIC_LOGICAL_ID(ldr
);
185 if (kvm_apic_get_reg(apic
, APIC_DFR
) == APIC_DFR_FLAT
)
186 new->mode
|= KVM_APIC_MODE_XAPIC_FLAT
;
188 new->mode
|= KVM_APIC_MODE_XAPIC_CLUSTER
;
191 if (!kvm_apic_logical_map_valid(new))
194 apic_logical_id(new, ldr
, &cid
, &lid
);
196 if (lid
&& cid
< ARRAY_SIZE(new->logical_map
))
197 new->logical_map
[cid
][ffs(lid
) - 1] = apic
;
200 old
= rcu_dereference_protected(kvm
->arch
.apic_map
,
201 lockdep_is_held(&kvm
->arch
.apic_map_lock
));
202 rcu_assign_pointer(kvm
->arch
.apic_map
, new);
203 mutex_unlock(&kvm
->arch
.apic_map_lock
);
208 kvm_make_scan_ioapic_request(kvm
);
211 static inline void apic_set_spiv(struct kvm_lapic
*apic
, u32 val
)
213 bool enabled
= val
& APIC_SPIV_APIC_ENABLED
;
215 apic_set_reg(apic
, APIC_SPIV
, val
);
217 if (enabled
!= apic
->sw_enabled
) {
218 apic
->sw_enabled
= enabled
;
220 static_key_slow_dec_deferred(&apic_sw_disabled
);
221 recalculate_apic_map(apic
->vcpu
->kvm
);
223 static_key_slow_inc(&apic_sw_disabled
.key
);
227 static inline void kvm_apic_set_id(struct kvm_lapic
*apic
, u8 id
)
229 apic_set_reg(apic
, APIC_ID
, id
<< 24);
230 recalculate_apic_map(apic
->vcpu
->kvm
);
233 static inline void kvm_apic_set_ldr(struct kvm_lapic
*apic
, u32 id
)
235 apic_set_reg(apic
, APIC_LDR
, id
);
236 recalculate_apic_map(apic
->vcpu
->kvm
);
239 static inline void kvm_apic_set_x2apic_id(struct kvm_lapic
*apic
, u8 id
)
241 u32 ldr
= ((id
>> 4) << 16) | (1 << (id
& 0xf));
243 apic_set_reg(apic
, APIC_ID
, id
<< 24);
244 apic_set_reg(apic
, APIC_LDR
, ldr
);
245 recalculate_apic_map(apic
->vcpu
->kvm
);
248 static inline int apic_lvt_enabled(struct kvm_lapic
*apic
, int lvt_type
)
250 return !(kvm_apic_get_reg(apic
, lvt_type
) & APIC_LVT_MASKED
);
253 static inline int apic_lvt_vector(struct kvm_lapic
*apic
, int lvt_type
)
255 return kvm_apic_get_reg(apic
, lvt_type
) & APIC_VECTOR_MASK
;
258 static inline int apic_lvtt_oneshot(struct kvm_lapic
*apic
)
260 return apic
->lapic_timer
.timer_mode
== APIC_LVT_TIMER_ONESHOT
;
263 static inline int apic_lvtt_period(struct kvm_lapic
*apic
)
265 return apic
->lapic_timer
.timer_mode
== APIC_LVT_TIMER_PERIODIC
;
268 static inline int apic_lvtt_tscdeadline(struct kvm_lapic
*apic
)
270 return apic
->lapic_timer
.timer_mode
== APIC_LVT_TIMER_TSCDEADLINE
;
273 static inline int apic_lvt_nmi_mode(u32 lvt_val
)
275 return (lvt_val
& (APIC_MODE_MASK
| APIC_LVT_MASKED
)) == APIC_DM_NMI
;
278 void kvm_apic_set_version(struct kvm_vcpu
*vcpu
)
280 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
281 struct kvm_cpuid_entry2
*feat
;
282 u32 v
= APIC_VERSION
;
284 if (!lapic_in_kernel(vcpu
))
287 feat
= kvm_find_cpuid_entry(apic
->vcpu
, 0x1, 0);
288 if (feat
&& (feat
->ecx
& (1 << (X86_FEATURE_X2APIC
& 31))))
289 v
|= APIC_LVR_DIRECTED_EOI
;
290 apic_set_reg(apic
, APIC_LVR
, v
);
293 static const unsigned int apic_lvt_mask
[APIC_LVT_NUM
] = {
294 LVT_MASK
, /* part LVTT mask, timer mode mask added at runtime */
295 LVT_MASK
| APIC_MODE_MASK
, /* LVTTHMR */
296 LVT_MASK
| APIC_MODE_MASK
, /* LVTPC */
297 LINT_MASK
, LINT_MASK
, /* LVT0-1 */
298 LVT_MASK
/* LVTERR */
301 static int find_highest_vector(void *bitmap
)
306 for (vec
= MAX_APIC_VECTOR
- APIC_VECTORS_PER_REG
;
307 vec
>= 0; vec
-= APIC_VECTORS_PER_REG
) {
308 reg
= bitmap
+ REG_POS(vec
);
310 return fls(*reg
) - 1 + vec
;
316 static u8
count_vectors(void *bitmap
)
322 for (vec
= 0; vec
< MAX_APIC_VECTOR
; vec
+= APIC_VECTORS_PER_REG
) {
323 reg
= bitmap
+ REG_POS(vec
);
324 count
+= hweight32(*reg
);
330 void __kvm_apic_update_irr(u32
*pir
, void *regs
)
334 for (i
= 0; i
<= 7; i
++) {
335 pir_val
= xchg(&pir
[i
], 0);
337 *((u32
*)(regs
+ APIC_IRR
+ i
* 0x10)) |= pir_val
;
340 EXPORT_SYMBOL_GPL(__kvm_apic_update_irr
);
342 void kvm_apic_update_irr(struct kvm_vcpu
*vcpu
, u32
*pir
)
344 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
346 __kvm_apic_update_irr(pir
, apic
->regs
);
348 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
350 EXPORT_SYMBOL_GPL(kvm_apic_update_irr
);
352 static inline void apic_set_irr(int vec
, struct kvm_lapic
*apic
)
354 apic_set_vector(vec
, apic
->regs
+ APIC_IRR
);
356 * irr_pending must be true if any interrupt is pending; set it after
357 * APIC_IRR to avoid race with apic_clear_irr
359 apic
->irr_pending
= true;
362 static inline int apic_search_irr(struct kvm_lapic
*apic
)
364 return find_highest_vector(apic
->regs
+ APIC_IRR
);
367 static inline int apic_find_highest_irr(struct kvm_lapic
*apic
)
372 * Note that irr_pending is just a hint. It will be always
373 * true with virtual interrupt delivery enabled.
375 if (!apic
->irr_pending
)
378 if (apic
->vcpu
->arch
.apicv_active
)
379 kvm_x86_ops
->sync_pir_to_irr(apic
->vcpu
);
380 result
= apic_search_irr(apic
);
381 ASSERT(result
== -1 || result
>= 16);
386 static inline void apic_clear_irr(int vec
, struct kvm_lapic
*apic
)
388 struct kvm_vcpu
*vcpu
;
392 if (unlikely(vcpu
->arch
.apicv_active
)) {
393 /* try to update RVI */
394 apic_clear_vector(vec
, apic
->regs
+ APIC_IRR
);
395 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
397 apic
->irr_pending
= false;
398 apic_clear_vector(vec
, apic
->regs
+ APIC_IRR
);
399 if (apic_search_irr(apic
) != -1)
400 apic
->irr_pending
= true;
404 static inline void apic_set_isr(int vec
, struct kvm_lapic
*apic
)
406 struct kvm_vcpu
*vcpu
;
408 if (__apic_test_and_set_vector(vec
, apic
->regs
+ APIC_ISR
))
414 * With APIC virtualization enabled, all caching is disabled
415 * because the processor can modify ISR under the hood. Instead
418 if (unlikely(vcpu
->arch
.apicv_active
))
419 kvm_x86_ops
->hwapic_isr_update(vcpu
->kvm
, vec
);
422 BUG_ON(apic
->isr_count
> MAX_APIC_VECTOR
);
424 * ISR (in service register) bit is set when injecting an interrupt.
425 * The highest vector is injected. Thus the latest bit set matches
426 * the highest bit in ISR.
428 apic
->highest_isr_cache
= vec
;
432 static inline int apic_find_highest_isr(struct kvm_lapic
*apic
)
437 * Note that isr_count is always 1, and highest_isr_cache
438 * is always -1, with APIC virtualization enabled.
440 if (!apic
->isr_count
)
442 if (likely(apic
->highest_isr_cache
!= -1))
443 return apic
->highest_isr_cache
;
445 result
= find_highest_vector(apic
->regs
+ APIC_ISR
);
446 ASSERT(result
== -1 || result
>= 16);
451 static inline void apic_clear_isr(int vec
, struct kvm_lapic
*apic
)
453 struct kvm_vcpu
*vcpu
;
454 if (!__apic_test_and_clear_vector(vec
, apic
->regs
+ APIC_ISR
))
460 * We do get here for APIC virtualization enabled if the guest
461 * uses the Hyper-V APIC enlightenment. In this case we may need
462 * to trigger a new interrupt delivery by writing the SVI field;
463 * on the other hand isr_count and highest_isr_cache are unused
464 * and must be left alone.
466 if (unlikely(vcpu
->arch
.apicv_active
))
467 kvm_x86_ops
->hwapic_isr_update(vcpu
->kvm
,
468 apic_find_highest_isr(apic
));
471 BUG_ON(apic
->isr_count
< 0);
472 apic
->highest_isr_cache
= -1;
476 int kvm_lapic_find_highest_irr(struct kvm_vcpu
*vcpu
)
478 /* This may race with setting of irr in __apic_accept_irq() and
479 * value returned may be wrong, but kvm_vcpu_kick() in __apic_accept_irq
480 * will cause vmexit immediately and the value will be recalculated
481 * on the next vmentry.
483 return apic_find_highest_irr(vcpu
->arch
.apic
);
486 static int __apic_accept_irq(struct kvm_lapic
*apic
, int delivery_mode
,
487 int vector
, int level
, int trig_mode
,
488 struct dest_map
*dest_map
);
490 int kvm_apic_set_irq(struct kvm_vcpu
*vcpu
, struct kvm_lapic_irq
*irq
,
491 struct dest_map
*dest_map
)
493 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
495 return __apic_accept_irq(apic
, irq
->delivery_mode
, irq
->vector
,
496 irq
->level
, irq
->trig_mode
, dest_map
);
499 static int pv_eoi_put_user(struct kvm_vcpu
*vcpu
, u8 val
)
502 return kvm_write_guest_cached(vcpu
->kvm
, &vcpu
->arch
.pv_eoi
.data
, &val
,
506 static int pv_eoi_get_user(struct kvm_vcpu
*vcpu
, u8
*val
)
509 return kvm_read_guest_cached(vcpu
->kvm
, &vcpu
->arch
.pv_eoi
.data
, val
,
513 static inline bool pv_eoi_enabled(struct kvm_vcpu
*vcpu
)
515 return vcpu
->arch
.pv_eoi
.msr_val
& KVM_MSR_ENABLED
;
518 static bool pv_eoi_get_pending(struct kvm_vcpu
*vcpu
)
521 if (pv_eoi_get_user(vcpu
, &val
) < 0)
522 apic_debug("Can't read EOI MSR value: 0x%llx\n",
523 (unsigned long long)vcpu
->arch
.pv_eoi
.msr_val
);
527 static void pv_eoi_set_pending(struct kvm_vcpu
*vcpu
)
529 if (pv_eoi_put_user(vcpu
, KVM_PV_EOI_ENABLED
) < 0) {
530 apic_debug("Can't set EOI MSR value: 0x%llx\n",
531 (unsigned long long)vcpu
->arch
.pv_eoi
.msr_val
);
534 __set_bit(KVM_APIC_PV_EOI_PENDING
, &vcpu
->arch
.apic_attention
);
537 static void pv_eoi_clr_pending(struct kvm_vcpu
*vcpu
)
539 if (pv_eoi_put_user(vcpu
, KVM_PV_EOI_DISABLED
) < 0) {
540 apic_debug("Can't clear EOI MSR value: 0x%llx\n",
541 (unsigned long long)vcpu
->arch
.pv_eoi
.msr_val
);
544 __clear_bit(KVM_APIC_PV_EOI_PENDING
, &vcpu
->arch
.apic_attention
);
547 static void apic_update_ppr(struct kvm_lapic
*apic
)
549 u32 tpr
, isrv
, ppr
, old_ppr
;
552 old_ppr
= kvm_apic_get_reg(apic
, APIC_PROCPRI
);
553 tpr
= kvm_apic_get_reg(apic
, APIC_TASKPRI
);
554 isr
= apic_find_highest_isr(apic
);
555 isrv
= (isr
!= -1) ? isr
: 0;
557 if ((tpr
& 0xf0) >= (isrv
& 0xf0))
562 apic_debug("vlapic %p, ppr 0x%x, isr 0x%x, isrv 0x%x",
563 apic
, ppr
, isr
, isrv
);
565 if (old_ppr
!= ppr
) {
566 apic_set_reg(apic
, APIC_PROCPRI
, ppr
);
568 kvm_make_request(KVM_REQ_EVENT
, apic
->vcpu
);
572 static void apic_set_tpr(struct kvm_lapic
*apic
, u32 tpr
)
574 apic_set_reg(apic
, APIC_TASKPRI
, tpr
);
575 apic_update_ppr(apic
);
578 static bool kvm_apic_broadcast(struct kvm_lapic
*apic
, u32 mda
)
580 if (apic_x2apic_mode(apic
))
581 return mda
== X2APIC_BROADCAST
;
583 return GET_APIC_DEST_FIELD(mda
) == APIC_BROADCAST
;
586 static bool kvm_apic_match_physical_addr(struct kvm_lapic
*apic
, u32 mda
)
588 if (kvm_apic_broadcast(apic
, mda
))
591 if (apic_x2apic_mode(apic
))
592 return mda
== kvm_apic_id(apic
);
594 return mda
== SET_APIC_DEST_FIELD(kvm_apic_id(apic
));
597 static bool kvm_apic_match_logical_addr(struct kvm_lapic
*apic
, u32 mda
)
601 if (kvm_apic_broadcast(apic
, mda
))
604 logical_id
= kvm_apic_get_reg(apic
, APIC_LDR
);
606 if (apic_x2apic_mode(apic
))
607 return ((logical_id
>> 16) == (mda
>> 16))
608 && (logical_id
& mda
& 0xffff) != 0;
610 logical_id
= GET_APIC_LOGICAL_ID(logical_id
);
611 mda
= GET_APIC_DEST_FIELD(mda
);
613 switch (kvm_apic_get_reg(apic
, APIC_DFR
)) {
615 return (logical_id
& mda
) != 0;
616 case APIC_DFR_CLUSTER
:
617 return ((logical_id
>> 4) == (mda
>> 4))
618 && (logical_id
& mda
& 0xf) != 0;
620 apic_debug("Bad DFR vcpu %d: %08x\n",
621 apic
->vcpu
->vcpu_id
, kvm_apic_get_reg(apic
, APIC_DFR
));
626 /* KVM APIC implementation has two quirks
627 * - dest always begins at 0 while xAPIC MDA has offset 24,
628 * - IOxAPIC messages have to be delivered (directly) to x2APIC.
630 static u32
kvm_apic_mda(unsigned int dest_id
, struct kvm_lapic
*source
,
631 struct kvm_lapic
*target
)
633 bool ipi
= source
!= NULL
;
634 bool x2apic_mda
= apic_x2apic_mode(ipi
? source
: target
);
636 if (!ipi
&& dest_id
== APIC_BROADCAST
&& x2apic_mda
)
637 return X2APIC_BROADCAST
;
639 return x2apic_mda
? dest_id
: SET_APIC_DEST_FIELD(dest_id
);
642 bool kvm_apic_match_dest(struct kvm_vcpu
*vcpu
, struct kvm_lapic
*source
,
643 int short_hand
, unsigned int dest
, int dest_mode
)
645 struct kvm_lapic
*target
= vcpu
->arch
.apic
;
646 u32 mda
= kvm_apic_mda(dest
, source
, target
);
648 apic_debug("target %p, source %p, dest 0x%x, "
649 "dest_mode 0x%x, short_hand 0x%x\n",
650 target
, source
, dest
, dest_mode
, short_hand
);
653 switch (short_hand
) {
654 case APIC_DEST_NOSHORT
:
655 if (dest_mode
== APIC_DEST_PHYSICAL
)
656 return kvm_apic_match_physical_addr(target
, mda
);
658 return kvm_apic_match_logical_addr(target
, mda
);
660 return target
== source
;
661 case APIC_DEST_ALLINC
:
663 case APIC_DEST_ALLBUT
:
664 return target
!= source
;
666 apic_debug("kvm: apic: Bad dest shorthand value %x\n",
672 int kvm_vector_to_index(u32 vector
, u32 dest_vcpus
,
673 const unsigned long *bitmap
, u32 bitmap_size
)
678 mod
= vector
% dest_vcpus
;
680 for (i
= 0; i
<= mod
; i
++) {
681 idx
= find_next_bit(bitmap
, bitmap_size
, idx
+ 1);
682 BUG_ON(idx
== bitmap_size
);
688 static void kvm_apic_disabled_lapic_found(struct kvm
*kvm
)
690 if (!kvm
->arch
.disabled_lapic_found
) {
691 kvm
->arch
.disabled_lapic_found
= true;
693 "Disabled LAPIC found during irq injection\n");
697 bool kvm_irq_delivery_to_apic_fast(struct kvm
*kvm
, struct kvm_lapic
*src
,
698 struct kvm_lapic_irq
*irq
, int *r
, struct dest_map
*dest_map
)
700 struct kvm_apic_map
*map
;
701 unsigned long bitmap
= 1;
702 struct kvm_lapic
**dst
;
704 bool ret
, x2apic_ipi
;
708 if (irq
->shorthand
== APIC_DEST_SELF
) {
709 *r
= kvm_apic_set_irq(src
->vcpu
, irq
, dest_map
);
716 x2apic_ipi
= src
&& apic_x2apic_mode(src
);
717 if (irq
->dest_id
== (x2apic_ipi
? X2APIC_BROADCAST
: APIC_BROADCAST
))
722 map
= rcu_dereference(kvm
->arch
.apic_map
);
729 if (irq
->dest_mode
== APIC_DEST_PHYSICAL
) {
730 if (irq
->dest_id
>= ARRAY_SIZE(map
->phys_map
))
733 dst
= &map
->phys_map
[irq
->dest_id
];
737 if (!kvm_apic_logical_map_valid(map
)) {
742 apic_logical_id(map
, irq
->dest_id
, &cid
, (u16
*)&bitmap
);
744 if (cid
>= ARRAY_SIZE(map
->logical_map
))
747 dst
= map
->logical_map
[cid
];
749 if (!kvm_lowest_prio_delivery(irq
))
752 if (!kvm_vector_hashing_enabled()) {
754 for_each_set_bit(i
, &bitmap
, 16) {
759 else if (kvm_apic_compare_prio(dst
[i
]->vcpu
,
763 bitmap
= (l
>= 0) ? 1 << l
: 0;
766 unsigned int dest_vcpus
;
768 dest_vcpus
= hweight16(bitmap
);
772 idx
= kvm_vector_to_index(irq
->vector
,
773 dest_vcpus
, &bitmap
, 16);
776 kvm_apic_disabled_lapic_found(kvm
);
780 bitmap
= (idx
>= 0) ? 1 << idx
: 0;
785 for_each_set_bit(i
, &bitmap
, 16) {
790 *r
+= kvm_apic_set_irq(dst
[i
]->vcpu
, irq
, dest_map
);
798 * This routine tries to handler interrupts in posted mode, here is how
799 * it deals with different cases:
800 * - For single-destination interrupts, handle it in posted mode
801 * - Else if vector hashing is enabled and it is a lowest-priority
802 * interrupt, handle it in posted mode and use the following mechanism
803 * to find the destinaiton vCPU.
804 * 1. For lowest-priority interrupts, store all the possible
805 * destination vCPUs in an array.
806 * 2. Use "guest vector % max number of destination vCPUs" to find
807 * the right destination vCPU in the array for the lowest-priority
809 * - Otherwise, use remapped mode to inject the interrupt.
811 bool kvm_intr_is_single_vcpu_fast(struct kvm
*kvm
, struct kvm_lapic_irq
*irq
,
812 struct kvm_vcpu
**dest_vcpu
)
814 struct kvm_apic_map
*map
;
816 struct kvm_lapic
*dst
= NULL
;
822 map
= rcu_dereference(kvm
->arch
.apic_map
);
827 if (irq
->dest_mode
== APIC_DEST_PHYSICAL
) {
828 if (irq
->dest_id
== 0xFF)
831 if (irq
->dest_id
>= ARRAY_SIZE(map
->phys_map
))
834 dst
= map
->phys_map
[irq
->dest_id
];
835 if (dst
&& kvm_apic_present(dst
->vcpu
))
836 *dest_vcpu
= dst
->vcpu
;
841 unsigned long bitmap
= 1;
844 if (!kvm_apic_logical_map_valid(map
))
847 apic_logical_id(map
, irq
->dest_id
, &cid
, (u16
*)&bitmap
);
849 if (cid
>= ARRAY_SIZE(map
->logical_map
))
852 if (kvm_vector_hashing_enabled() &&
853 kvm_lowest_prio_delivery(irq
)) {
855 unsigned int dest_vcpus
;
857 dest_vcpus
= hweight16(bitmap
);
861 idx
= kvm_vector_to_index(irq
->vector
, dest_vcpus
,
864 dst
= map
->logical_map
[cid
][idx
];
866 kvm_apic_disabled_lapic_found(kvm
);
870 *dest_vcpu
= dst
->vcpu
;
872 for_each_set_bit(i
, &bitmap
, 16) {
873 dst
= map
->logical_map
[cid
][i
];
878 if (dst
&& kvm_apic_present(dst
->vcpu
))
879 *dest_vcpu
= dst
->vcpu
;
892 * Add a pending IRQ into lapic.
893 * Return 1 if successfully added and 0 if discarded.
895 static int __apic_accept_irq(struct kvm_lapic
*apic
, int delivery_mode
,
896 int vector
, int level
, int trig_mode
,
897 struct dest_map
*dest_map
)
900 struct kvm_vcpu
*vcpu
= apic
->vcpu
;
902 trace_kvm_apic_accept_irq(vcpu
->vcpu_id
, delivery_mode
,
904 switch (delivery_mode
) {
906 vcpu
->arch
.apic_arb_prio
++;
908 if (unlikely(trig_mode
&& !level
))
911 /* FIXME add logic for vcpu on reset */
912 if (unlikely(!apic_enabled(apic
)))
918 __set_bit(vcpu
->vcpu_id
, dest_map
->map
);
919 dest_map
->vectors
[vcpu
->vcpu_id
] = vector
;
922 if (apic_test_vector(vector
, apic
->regs
+ APIC_TMR
) != !!trig_mode
) {
924 apic_set_vector(vector
, apic
->regs
+ APIC_TMR
);
926 apic_clear_vector(vector
, apic
->regs
+ APIC_TMR
);
929 if (vcpu
->arch
.apicv_active
)
930 kvm_x86_ops
->deliver_posted_interrupt(vcpu
, vector
);
932 apic_set_irr(vector
, apic
);
934 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
941 vcpu
->arch
.pv
.pv_unhalted
= 1;
942 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
948 kvm_make_request(KVM_REQ_SMI
, vcpu
);
954 kvm_inject_nmi(vcpu
);
959 if (!trig_mode
|| level
) {
961 /* assumes that there are only KVM_APIC_INIT/SIPI */
962 apic
->pending_events
= (1UL << KVM_APIC_INIT
);
963 /* make sure pending_events is visible before sending
966 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
969 apic_debug("Ignoring de-assert INIT to vcpu %d\n",
974 case APIC_DM_STARTUP
:
975 apic_debug("SIPI to vcpu %d vector 0x%02x\n",
976 vcpu
->vcpu_id
, vector
);
978 apic
->sipi_vector
= vector
;
979 /* make sure sipi_vector is visible for the receiver */
981 set_bit(KVM_APIC_SIPI
, &apic
->pending_events
);
982 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
988 * Should only be called by kvm_apic_local_deliver() with LVT0,
989 * before NMI watchdog was enabled. Already handled by
990 * kvm_apic_accept_pic_intr().
995 printk(KERN_ERR
"TODO: unsupported delivery mode %x\n",
1002 int kvm_apic_compare_prio(struct kvm_vcpu
*vcpu1
, struct kvm_vcpu
*vcpu2
)
1004 return vcpu1
->arch
.apic_arb_prio
- vcpu2
->arch
.apic_arb_prio
;
1007 static bool kvm_ioapic_handles_vector(struct kvm_lapic
*apic
, int vector
)
1009 return test_bit(vector
, apic
->vcpu
->arch
.ioapic_handled_vectors
);
1012 static void kvm_ioapic_send_eoi(struct kvm_lapic
*apic
, int vector
)
1016 /* Eoi the ioapic only if the ioapic doesn't own the vector. */
1017 if (!kvm_ioapic_handles_vector(apic
, vector
))
1020 /* Request a KVM exit to inform the userspace IOAPIC. */
1021 if (irqchip_split(apic
->vcpu
->kvm
)) {
1022 apic
->vcpu
->arch
.pending_ioapic_eoi
= vector
;
1023 kvm_make_request(KVM_REQ_IOAPIC_EOI_EXIT
, apic
->vcpu
);
1027 if (apic_test_vector(vector
, apic
->regs
+ APIC_TMR
))
1028 trigger_mode
= IOAPIC_LEVEL_TRIG
;
1030 trigger_mode
= IOAPIC_EDGE_TRIG
;
1032 kvm_ioapic_update_eoi(apic
->vcpu
, vector
, trigger_mode
);
1035 static int apic_set_eoi(struct kvm_lapic
*apic
)
1037 int vector
= apic_find_highest_isr(apic
);
1039 trace_kvm_eoi(apic
, vector
);
1042 * Not every write EOI will has corresponding ISR,
1043 * one example is when Kernel check timer on setup_IO_APIC
1048 apic_clear_isr(vector
, apic
);
1049 apic_update_ppr(apic
);
1051 if (test_bit(vector
, vcpu_to_synic(apic
->vcpu
)->vec_bitmap
))
1052 kvm_hv_synic_send_eoi(apic
->vcpu
, vector
);
1054 kvm_ioapic_send_eoi(apic
, vector
);
1055 kvm_make_request(KVM_REQ_EVENT
, apic
->vcpu
);
1060 * this interface assumes a trap-like exit, which has already finished
1061 * desired side effect including vISR and vPPR update.
1063 void kvm_apic_set_eoi_accelerated(struct kvm_vcpu
*vcpu
, int vector
)
1065 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
1067 trace_kvm_eoi(apic
, vector
);
1069 kvm_ioapic_send_eoi(apic
, vector
);
1070 kvm_make_request(KVM_REQ_EVENT
, apic
->vcpu
);
1072 EXPORT_SYMBOL_GPL(kvm_apic_set_eoi_accelerated
);
1074 static void apic_send_ipi(struct kvm_lapic
*apic
)
1076 u32 icr_low
= kvm_apic_get_reg(apic
, APIC_ICR
);
1077 u32 icr_high
= kvm_apic_get_reg(apic
, APIC_ICR2
);
1078 struct kvm_lapic_irq irq
;
1080 irq
.vector
= icr_low
& APIC_VECTOR_MASK
;
1081 irq
.delivery_mode
= icr_low
& APIC_MODE_MASK
;
1082 irq
.dest_mode
= icr_low
& APIC_DEST_MASK
;
1083 irq
.level
= (icr_low
& APIC_INT_ASSERT
) != 0;
1084 irq
.trig_mode
= icr_low
& APIC_INT_LEVELTRIG
;
1085 irq
.shorthand
= icr_low
& APIC_SHORT_MASK
;
1086 irq
.msi_redir_hint
= false;
1087 if (apic_x2apic_mode(apic
))
1088 irq
.dest_id
= icr_high
;
1090 irq
.dest_id
= GET_APIC_DEST_FIELD(icr_high
);
1092 trace_kvm_apic_ipi(icr_low
, irq
.dest_id
);
1094 apic_debug("icr_high 0x%x, icr_low 0x%x, "
1095 "short_hand 0x%x, dest 0x%x, trig_mode 0x%x, level 0x%x, "
1096 "dest_mode 0x%x, delivery_mode 0x%x, vector 0x%x, "
1097 "msi_redir_hint 0x%x\n",
1098 icr_high
, icr_low
, irq
.shorthand
, irq
.dest_id
,
1099 irq
.trig_mode
, irq
.level
, irq
.dest_mode
, irq
.delivery_mode
,
1100 irq
.vector
, irq
.msi_redir_hint
);
1102 kvm_irq_delivery_to_apic(apic
->vcpu
->kvm
, apic
, &irq
, NULL
);
1105 static u32
apic_get_tmcct(struct kvm_lapic
*apic
)
1111 ASSERT(apic
!= NULL
);
1113 /* if initial count is 0, current count should also be 0 */
1114 if (kvm_apic_get_reg(apic
, APIC_TMICT
) == 0 ||
1115 apic
->lapic_timer
.period
== 0)
1118 remaining
= hrtimer_get_remaining(&apic
->lapic_timer
.timer
);
1119 if (ktime_to_ns(remaining
) < 0)
1120 remaining
= ktime_set(0, 0);
1122 ns
= mod_64(ktime_to_ns(remaining
), apic
->lapic_timer
.period
);
1123 tmcct
= div64_u64(ns
,
1124 (APIC_BUS_CYCLE_NS
* apic
->divide_count
));
1129 static void __report_tpr_access(struct kvm_lapic
*apic
, bool write
)
1131 struct kvm_vcpu
*vcpu
= apic
->vcpu
;
1132 struct kvm_run
*run
= vcpu
->run
;
1134 kvm_make_request(KVM_REQ_REPORT_TPR_ACCESS
, vcpu
);
1135 run
->tpr_access
.rip
= kvm_rip_read(vcpu
);
1136 run
->tpr_access
.is_write
= write
;
1139 static inline void report_tpr_access(struct kvm_lapic
*apic
, bool write
)
1141 if (apic
->vcpu
->arch
.tpr_access_reporting
)
1142 __report_tpr_access(apic
, write
);
1145 static u32
__apic_read(struct kvm_lapic
*apic
, unsigned int offset
)
1149 if (offset
>= LAPIC_MMIO_LENGTH
)
1154 if (apic_x2apic_mode(apic
))
1155 val
= kvm_apic_id(apic
);
1157 val
= kvm_apic_id(apic
) << 24;
1160 apic_debug("Access APIC ARBPRI register which is for P6\n");
1163 case APIC_TMCCT
: /* Timer CCR */
1164 if (apic_lvtt_tscdeadline(apic
))
1167 val
= apic_get_tmcct(apic
);
1170 apic_update_ppr(apic
);
1171 val
= kvm_apic_get_reg(apic
, offset
);
1174 report_tpr_access(apic
, false);
1177 val
= kvm_apic_get_reg(apic
, offset
);
1184 static inline struct kvm_lapic
*to_lapic(struct kvm_io_device
*dev
)
1186 return container_of(dev
, struct kvm_lapic
, dev
);
1189 static int apic_reg_read(struct kvm_lapic
*apic
, u32 offset
, int len
,
1192 unsigned char alignment
= offset
& 0xf;
1194 /* this bitmask has a bit cleared for each reserved register */
1195 static const u64 rmask
= 0x43ff01ffffffe70cULL
;
1197 if ((alignment
+ len
) > 4) {
1198 apic_debug("KVM_APIC_READ: alignment error %x %d\n",
1203 if (offset
> 0x3f0 || !(rmask
& (1ULL << (offset
>> 4)))) {
1204 apic_debug("KVM_APIC_READ: read reserved register %x\n",
1209 result
= __apic_read(apic
, offset
& ~0xf);
1211 trace_kvm_apic_read(offset
, result
);
1217 memcpy(data
, (char *)&result
+ alignment
, len
);
1220 printk(KERN_ERR
"Local APIC read with len = %x, "
1221 "should be 1,2, or 4 instead\n", len
);
1227 static int apic_mmio_in_range(struct kvm_lapic
*apic
, gpa_t addr
)
1229 return kvm_apic_hw_enabled(apic
) &&
1230 addr
>= apic
->base_address
&&
1231 addr
< apic
->base_address
+ LAPIC_MMIO_LENGTH
;
1234 static int apic_mmio_read(struct kvm_vcpu
*vcpu
, struct kvm_io_device
*this,
1235 gpa_t address
, int len
, void *data
)
1237 struct kvm_lapic
*apic
= to_lapic(this);
1238 u32 offset
= address
- apic
->base_address
;
1240 if (!apic_mmio_in_range(apic
, address
))
1243 apic_reg_read(apic
, offset
, len
, data
);
1248 static void update_divide_count(struct kvm_lapic
*apic
)
1250 u32 tmp1
, tmp2
, tdcr
;
1252 tdcr
= kvm_apic_get_reg(apic
, APIC_TDCR
);
1254 tmp2
= ((tmp1
& 0x3) | ((tmp1
& 0x8) >> 1)) + 1;
1255 apic
->divide_count
= 0x1 << (tmp2
& 0x7);
1257 apic_debug("timer divide count is 0x%x\n",
1258 apic
->divide_count
);
1261 static void apic_update_lvtt(struct kvm_lapic
*apic
)
1263 u32 timer_mode
= kvm_apic_get_reg(apic
, APIC_LVTT
) &
1264 apic
->lapic_timer
.timer_mode_mask
;
1266 if (apic
->lapic_timer
.timer_mode
!= timer_mode
) {
1267 apic
->lapic_timer
.timer_mode
= timer_mode
;
1268 hrtimer_cancel(&apic
->lapic_timer
.timer
);
1272 static void apic_timer_expired(struct kvm_lapic
*apic
)
1274 struct kvm_vcpu
*vcpu
= apic
->vcpu
;
1275 struct swait_queue_head
*q
= &vcpu
->wq
;
1276 struct kvm_timer
*ktimer
= &apic
->lapic_timer
;
1278 if (atomic_read(&apic
->lapic_timer
.pending
))
1281 atomic_inc(&apic
->lapic_timer
.pending
);
1282 kvm_set_pending_timer(vcpu
);
1284 if (swait_active(q
))
1287 if (apic_lvtt_tscdeadline(apic
))
1288 ktimer
->expired_tscdeadline
= ktimer
->tscdeadline
;
1292 * On APICv, this test will cause a busy wait
1293 * during a higher-priority task.
1296 static bool lapic_timer_int_injected(struct kvm_vcpu
*vcpu
)
1298 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
1299 u32 reg
= kvm_apic_get_reg(apic
, APIC_LVTT
);
1301 if (kvm_apic_hw_enabled(apic
)) {
1302 int vec
= reg
& APIC_VECTOR_MASK
;
1303 void *bitmap
= apic
->regs
+ APIC_ISR
;
1305 if (vcpu
->arch
.apicv_active
)
1306 bitmap
= apic
->regs
+ APIC_IRR
;
1308 if (apic_test_vector(vec
, bitmap
))
1314 void wait_lapic_expire(struct kvm_vcpu
*vcpu
)
1316 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
1317 u64 guest_tsc
, tsc_deadline
;
1319 if (!lapic_in_kernel(vcpu
))
1322 if (apic
->lapic_timer
.expired_tscdeadline
== 0)
1325 if (!lapic_timer_int_injected(vcpu
))
1328 tsc_deadline
= apic
->lapic_timer
.expired_tscdeadline
;
1329 apic
->lapic_timer
.expired_tscdeadline
= 0;
1330 guest_tsc
= kvm_read_l1_tsc(vcpu
, rdtsc());
1331 trace_kvm_wait_lapic_expire(vcpu
->vcpu_id
, guest_tsc
- tsc_deadline
);
1333 /* __delay is delay_tsc whenever the hardware has TSC, thus always. */
1334 if (guest_tsc
< tsc_deadline
)
1335 __delay(tsc_deadline
- guest_tsc
);
1338 static void start_apic_timer(struct kvm_lapic
*apic
)
1342 atomic_set(&apic
->lapic_timer
.pending
, 0);
1344 if (apic_lvtt_period(apic
) || apic_lvtt_oneshot(apic
)) {
1345 /* lapic timer in oneshot or periodic mode */
1346 now
= apic
->lapic_timer
.timer
.base
->get_time();
1347 apic
->lapic_timer
.period
= (u64
)kvm_apic_get_reg(apic
, APIC_TMICT
)
1348 * APIC_BUS_CYCLE_NS
* apic
->divide_count
;
1350 if (!apic
->lapic_timer
.period
)
1353 * Do not allow the guest to program periodic timers with small
1354 * interval, since the hrtimers are not throttled by the host
1357 if (apic_lvtt_period(apic
)) {
1358 s64 min_period
= min_timer_period_us
* 1000LL;
1360 if (apic
->lapic_timer
.period
< min_period
) {
1361 pr_info_ratelimited(
1362 "kvm: vcpu %i: requested %lld ns "
1363 "lapic timer period limited to %lld ns\n",
1364 apic
->vcpu
->vcpu_id
,
1365 apic
->lapic_timer
.period
, min_period
);
1366 apic
->lapic_timer
.period
= min_period
;
1370 hrtimer_start(&apic
->lapic_timer
.timer
,
1371 ktime_add_ns(now
, apic
->lapic_timer
.period
),
1372 HRTIMER_MODE_ABS_PINNED
);
1374 apic_debug("%s: bus cycle is %" PRId64
"ns, now 0x%016"
1376 "timer initial count 0x%x, period %lldns, "
1377 "expire @ 0x%016" PRIx64
".\n", __func__
,
1378 APIC_BUS_CYCLE_NS
, ktime_to_ns(now
),
1379 kvm_apic_get_reg(apic
, APIC_TMICT
),
1380 apic
->lapic_timer
.period
,
1381 ktime_to_ns(ktime_add_ns(now
,
1382 apic
->lapic_timer
.period
)));
1383 } else if (apic_lvtt_tscdeadline(apic
)) {
1384 /* lapic timer in tsc deadline mode */
1385 u64 guest_tsc
, tscdeadline
= apic
->lapic_timer
.tscdeadline
;
1388 struct kvm_vcpu
*vcpu
= apic
->vcpu
;
1389 unsigned long this_tsc_khz
= vcpu
->arch
.virtual_tsc_khz
;
1390 unsigned long flags
;
1392 if (unlikely(!tscdeadline
|| !this_tsc_khz
))
1395 local_irq_save(flags
);
1397 now
= apic
->lapic_timer
.timer
.base
->get_time();
1398 guest_tsc
= kvm_read_l1_tsc(vcpu
, rdtsc());
1399 if (likely(tscdeadline
> guest_tsc
)) {
1400 ns
= (tscdeadline
- guest_tsc
) * 1000000ULL;
1401 do_div(ns
, this_tsc_khz
);
1402 expire
= ktime_add_ns(now
, ns
);
1403 expire
= ktime_sub_ns(expire
, lapic_timer_advance_ns
);
1404 hrtimer_start(&apic
->lapic_timer
.timer
,
1405 expire
, HRTIMER_MODE_ABS_PINNED
);
1407 apic_timer_expired(apic
);
1409 local_irq_restore(flags
);
1413 static void apic_manage_nmi_watchdog(struct kvm_lapic
*apic
, u32 lvt0_val
)
1415 bool lvt0_in_nmi_mode
= apic_lvt_nmi_mode(lvt0_val
);
1417 if (apic
->lvt0_in_nmi_mode
!= lvt0_in_nmi_mode
) {
1418 apic
->lvt0_in_nmi_mode
= lvt0_in_nmi_mode
;
1419 if (lvt0_in_nmi_mode
) {
1420 apic_debug("Receive NMI setting on APIC_LVT0 "
1421 "for cpu %d\n", apic
->vcpu
->vcpu_id
);
1422 atomic_inc(&apic
->vcpu
->kvm
->arch
.vapics_in_nmi_mode
);
1424 atomic_dec(&apic
->vcpu
->kvm
->arch
.vapics_in_nmi_mode
);
1428 static int apic_reg_write(struct kvm_lapic
*apic
, u32 reg
, u32 val
)
1432 trace_kvm_apic_write(reg
, val
);
1435 case APIC_ID
: /* Local APIC ID */
1436 if (!apic_x2apic_mode(apic
))
1437 kvm_apic_set_id(apic
, val
>> 24);
1443 report_tpr_access(apic
, true);
1444 apic_set_tpr(apic
, val
& 0xff);
1452 if (!apic_x2apic_mode(apic
))
1453 kvm_apic_set_ldr(apic
, val
& APIC_LDR_MASK
);
1459 if (!apic_x2apic_mode(apic
)) {
1460 apic_set_reg(apic
, APIC_DFR
, val
| 0x0FFFFFFF);
1461 recalculate_apic_map(apic
->vcpu
->kvm
);
1468 if (kvm_apic_get_reg(apic
, APIC_LVR
) & APIC_LVR_DIRECTED_EOI
)
1469 mask
|= APIC_SPIV_DIRECTED_EOI
;
1470 apic_set_spiv(apic
, val
& mask
);
1471 if (!(val
& APIC_SPIV_APIC_ENABLED
)) {
1475 for (i
= 0; i
< APIC_LVT_NUM
; i
++) {
1476 lvt_val
= kvm_apic_get_reg(apic
,
1477 APIC_LVTT
+ 0x10 * i
);
1478 apic_set_reg(apic
, APIC_LVTT
+ 0x10 * i
,
1479 lvt_val
| APIC_LVT_MASKED
);
1481 apic_update_lvtt(apic
);
1482 atomic_set(&apic
->lapic_timer
.pending
, 0);
1488 /* No delay here, so we always clear the pending bit */
1489 apic_set_reg(apic
, APIC_ICR
, val
& ~(1 << 12));
1490 apic_send_ipi(apic
);
1494 if (!apic_x2apic_mode(apic
))
1496 apic_set_reg(apic
, APIC_ICR2
, val
);
1500 apic_manage_nmi_watchdog(apic
, val
);
1505 /* TODO: Check vector */
1506 if (!kvm_apic_sw_enabled(apic
))
1507 val
|= APIC_LVT_MASKED
;
1509 val
&= apic_lvt_mask
[(reg
- APIC_LVTT
) >> 4];
1510 apic_set_reg(apic
, reg
, val
);
1515 if (!kvm_apic_sw_enabled(apic
))
1516 val
|= APIC_LVT_MASKED
;
1517 val
&= (apic_lvt_mask
[0] | apic
->lapic_timer
.timer_mode_mask
);
1518 apic_set_reg(apic
, APIC_LVTT
, val
);
1519 apic_update_lvtt(apic
);
1523 if (apic_lvtt_tscdeadline(apic
))
1526 hrtimer_cancel(&apic
->lapic_timer
.timer
);
1527 apic_set_reg(apic
, APIC_TMICT
, val
);
1528 start_apic_timer(apic
);
1533 apic_debug("KVM_WRITE:TDCR %x\n", val
);
1534 apic_set_reg(apic
, APIC_TDCR
, val
);
1535 update_divide_count(apic
);
1539 if (apic_x2apic_mode(apic
) && val
!= 0) {
1540 apic_debug("KVM_WRITE:ESR not zero %x\n", val
);
1546 if (apic_x2apic_mode(apic
)) {
1547 apic_reg_write(apic
, APIC_ICR
, 0x40000 | (val
& 0xff));
1556 apic_debug("Local APIC Write to read-only register %x\n", reg
);
1560 static int apic_mmio_write(struct kvm_vcpu
*vcpu
, struct kvm_io_device
*this,
1561 gpa_t address
, int len
, const void *data
)
1563 struct kvm_lapic
*apic
= to_lapic(this);
1564 unsigned int offset
= address
- apic
->base_address
;
1567 if (!apic_mmio_in_range(apic
, address
))
1571 * APIC register must be aligned on 128-bits boundary.
1572 * 32/64/128 bits registers must be accessed thru 32 bits.
1575 if (len
!= 4 || (offset
& 0xf)) {
1576 /* Don't shout loud, $infamous_os would cause only noise. */
1577 apic_debug("apic write: bad size=%d %lx\n", len
, (long)address
);
1583 /* too common printing */
1584 if (offset
!= APIC_EOI
)
1585 apic_debug("%s: offset 0x%x with length 0x%x, and value is "
1586 "0x%x\n", __func__
, offset
, len
, val
);
1588 apic_reg_write(apic
, offset
& 0xff0, val
);
1593 void kvm_lapic_set_eoi(struct kvm_vcpu
*vcpu
)
1595 apic_reg_write(vcpu
->arch
.apic
, APIC_EOI
, 0);
1597 EXPORT_SYMBOL_GPL(kvm_lapic_set_eoi
);
1599 /* emulate APIC access in a trap manner */
1600 void kvm_apic_write_nodecode(struct kvm_vcpu
*vcpu
, u32 offset
)
1604 /* hw has done the conditional check and inst decode */
1607 apic_reg_read(vcpu
->arch
.apic
, offset
, 4, &val
);
1609 /* TODO: optimize to just emulate side effect w/o one more write */
1610 apic_reg_write(vcpu
->arch
.apic
, offset
, val
);
1612 EXPORT_SYMBOL_GPL(kvm_apic_write_nodecode
);
1614 void kvm_free_lapic(struct kvm_vcpu
*vcpu
)
1616 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
1618 if (!vcpu
->arch
.apic
)
1621 hrtimer_cancel(&apic
->lapic_timer
.timer
);
1623 if (!(vcpu
->arch
.apic_base
& MSR_IA32_APICBASE_ENABLE
))
1624 static_key_slow_dec_deferred(&apic_hw_disabled
);
1626 if (!apic
->sw_enabled
)
1627 static_key_slow_dec_deferred(&apic_sw_disabled
);
1630 free_page((unsigned long)apic
->regs
);
1636 *----------------------------------------------------------------------
1638 *----------------------------------------------------------------------
1641 u64
kvm_get_lapic_tscdeadline_msr(struct kvm_vcpu
*vcpu
)
1643 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
1645 if (!lapic_in_kernel(vcpu
) || apic_lvtt_oneshot(apic
) ||
1646 apic_lvtt_period(apic
))
1649 return apic
->lapic_timer
.tscdeadline
;
1652 void kvm_set_lapic_tscdeadline_msr(struct kvm_vcpu
*vcpu
, u64 data
)
1654 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
1656 if (!lapic_in_kernel(vcpu
) || apic_lvtt_oneshot(apic
) ||
1657 apic_lvtt_period(apic
))
1660 hrtimer_cancel(&apic
->lapic_timer
.timer
);
1661 apic
->lapic_timer
.tscdeadline
= data
;
1662 start_apic_timer(apic
);
1665 void kvm_lapic_set_tpr(struct kvm_vcpu
*vcpu
, unsigned long cr8
)
1667 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
1669 apic_set_tpr(apic
, ((cr8
& 0x0f) << 4)
1670 | (kvm_apic_get_reg(apic
, APIC_TASKPRI
) & 4));
1673 u64
kvm_lapic_get_cr8(struct kvm_vcpu
*vcpu
)
1677 tpr
= (u64
) kvm_apic_get_reg(vcpu
->arch
.apic
, APIC_TASKPRI
);
1679 return (tpr
& 0xf0) >> 4;
1682 void kvm_lapic_set_base(struct kvm_vcpu
*vcpu
, u64 value
)
1684 u64 old_value
= vcpu
->arch
.apic_base
;
1685 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
1688 value
|= MSR_IA32_APICBASE_BSP
;
1689 vcpu
->arch
.apic_base
= value
;
1693 vcpu
->arch
.apic_base
= value
;
1695 /* update jump label if enable bit changes */
1696 if ((old_value
^ value
) & MSR_IA32_APICBASE_ENABLE
) {
1697 if (value
& MSR_IA32_APICBASE_ENABLE
)
1698 static_key_slow_dec_deferred(&apic_hw_disabled
);
1700 static_key_slow_inc(&apic_hw_disabled
.key
);
1701 recalculate_apic_map(vcpu
->kvm
);
1704 if ((old_value
^ value
) & X2APIC_ENABLE
) {
1705 if (value
& X2APIC_ENABLE
) {
1706 kvm_apic_set_x2apic_id(apic
, vcpu
->vcpu_id
);
1707 kvm_x86_ops
->set_virtual_x2apic_mode(vcpu
, true);
1709 kvm_x86_ops
->set_virtual_x2apic_mode(vcpu
, false);
1712 apic
->base_address
= apic
->vcpu
->arch
.apic_base
&
1713 MSR_IA32_APICBASE_BASE
;
1715 if ((value
& MSR_IA32_APICBASE_ENABLE
) &&
1716 apic
->base_address
!= APIC_DEFAULT_PHYS_BASE
)
1717 pr_warn_once("APIC base relocation is unsupported by KVM");
1719 /* with FSB delivery interrupt, we can restart APIC functionality */
1720 apic_debug("apic base msr is 0x%016" PRIx64
", and base address is "
1721 "0x%lx.\n", apic
->vcpu
->arch
.apic_base
, apic
->base_address
);
1725 void kvm_lapic_reset(struct kvm_vcpu
*vcpu
, bool init_event
)
1727 struct kvm_lapic
*apic
;
1730 apic_debug("%s\n", __func__
);
1733 apic
= vcpu
->arch
.apic
;
1734 ASSERT(apic
!= NULL
);
1736 /* Stop the timer in case it's a reset to an active apic */
1737 hrtimer_cancel(&apic
->lapic_timer
.timer
);
1740 kvm_apic_set_id(apic
, vcpu
->vcpu_id
);
1741 kvm_apic_set_version(apic
->vcpu
);
1743 for (i
= 0; i
< APIC_LVT_NUM
; i
++)
1744 apic_set_reg(apic
, APIC_LVTT
+ 0x10 * i
, APIC_LVT_MASKED
);
1745 apic_update_lvtt(apic
);
1746 if (kvm_check_has_quirk(vcpu
->kvm
, KVM_X86_QUIRK_LINT0_REENABLED
))
1747 apic_set_reg(apic
, APIC_LVT0
,
1748 SET_APIC_DELIVERY_MODE(0, APIC_MODE_EXTINT
));
1749 apic_manage_nmi_watchdog(apic
, kvm_apic_get_reg(apic
, APIC_LVT0
));
1751 apic_set_reg(apic
, APIC_DFR
, 0xffffffffU
);
1752 apic_set_spiv(apic
, 0xff);
1753 apic_set_reg(apic
, APIC_TASKPRI
, 0);
1754 if (!apic_x2apic_mode(apic
))
1755 kvm_apic_set_ldr(apic
, 0);
1756 apic_set_reg(apic
, APIC_ESR
, 0);
1757 apic_set_reg(apic
, APIC_ICR
, 0);
1758 apic_set_reg(apic
, APIC_ICR2
, 0);
1759 apic_set_reg(apic
, APIC_TDCR
, 0);
1760 apic_set_reg(apic
, APIC_TMICT
, 0);
1761 for (i
= 0; i
< 8; i
++) {
1762 apic_set_reg(apic
, APIC_IRR
+ 0x10 * i
, 0);
1763 apic_set_reg(apic
, APIC_ISR
+ 0x10 * i
, 0);
1764 apic_set_reg(apic
, APIC_TMR
+ 0x10 * i
, 0);
1766 apic
->irr_pending
= vcpu
->arch
.apicv_active
;
1767 apic
->isr_count
= vcpu
->arch
.apicv_active
? 1 : 0;
1768 apic
->highest_isr_cache
= -1;
1769 update_divide_count(apic
);
1770 atomic_set(&apic
->lapic_timer
.pending
, 0);
1771 if (kvm_vcpu_is_bsp(vcpu
))
1772 kvm_lapic_set_base(vcpu
,
1773 vcpu
->arch
.apic_base
| MSR_IA32_APICBASE_BSP
);
1774 vcpu
->arch
.pv_eoi
.msr_val
= 0;
1775 apic_update_ppr(apic
);
1777 vcpu
->arch
.apic_arb_prio
= 0;
1778 vcpu
->arch
.apic_attention
= 0;
1780 apic_debug("%s: vcpu=%p, id=%d, base_msr="
1781 "0x%016" PRIx64
", base_address=0x%0lx.\n", __func__
,
1782 vcpu
, kvm_apic_id(apic
),
1783 vcpu
->arch
.apic_base
, apic
->base_address
);
1787 *----------------------------------------------------------------------
1789 *----------------------------------------------------------------------
1792 static bool lapic_is_periodic(struct kvm_lapic
*apic
)
1794 return apic_lvtt_period(apic
);
1797 int apic_has_pending_timer(struct kvm_vcpu
*vcpu
)
1799 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
1801 if (apic_enabled(apic
) && apic_lvt_enabled(apic
, APIC_LVTT
))
1802 return atomic_read(&apic
->lapic_timer
.pending
);
1807 int kvm_apic_local_deliver(struct kvm_lapic
*apic
, int lvt_type
)
1809 u32 reg
= kvm_apic_get_reg(apic
, lvt_type
);
1810 int vector
, mode
, trig_mode
;
1812 if (kvm_apic_hw_enabled(apic
) && !(reg
& APIC_LVT_MASKED
)) {
1813 vector
= reg
& APIC_VECTOR_MASK
;
1814 mode
= reg
& APIC_MODE_MASK
;
1815 trig_mode
= reg
& APIC_LVT_LEVEL_TRIGGER
;
1816 return __apic_accept_irq(apic
, mode
, vector
, 1, trig_mode
,
1822 void kvm_apic_nmi_wd_deliver(struct kvm_vcpu
*vcpu
)
1824 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
1827 kvm_apic_local_deliver(apic
, APIC_LVT0
);
1830 static const struct kvm_io_device_ops apic_mmio_ops
= {
1831 .read
= apic_mmio_read
,
1832 .write
= apic_mmio_write
,
1835 static enum hrtimer_restart
apic_timer_fn(struct hrtimer
*data
)
1837 struct kvm_timer
*ktimer
= container_of(data
, struct kvm_timer
, timer
);
1838 struct kvm_lapic
*apic
= container_of(ktimer
, struct kvm_lapic
, lapic_timer
);
1840 apic_timer_expired(apic
);
1842 if (lapic_is_periodic(apic
)) {
1843 hrtimer_add_expires_ns(&ktimer
->timer
, ktimer
->period
);
1844 return HRTIMER_RESTART
;
1846 return HRTIMER_NORESTART
;
1849 int kvm_create_lapic(struct kvm_vcpu
*vcpu
)
1851 struct kvm_lapic
*apic
;
1853 ASSERT(vcpu
!= NULL
);
1854 apic_debug("apic_init %d\n", vcpu
->vcpu_id
);
1856 apic
= kzalloc(sizeof(*apic
), GFP_KERNEL
);
1860 vcpu
->arch
.apic
= apic
;
1862 apic
->regs
= (void *)get_zeroed_page(GFP_KERNEL
);
1864 printk(KERN_ERR
"malloc apic regs error for vcpu %x\n",
1866 goto nomem_free_apic
;
1870 hrtimer_init(&apic
->lapic_timer
.timer
, CLOCK_MONOTONIC
,
1871 HRTIMER_MODE_ABS_PINNED
);
1872 apic
->lapic_timer
.timer
.function
= apic_timer_fn
;
1875 * APIC is created enabled. This will prevent kvm_lapic_set_base from
1876 * thinking that APIC satet has changed.
1878 vcpu
->arch
.apic_base
= MSR_IA32_APICBASE_ENABLE
;
1879 kvm_lapic_set_base(vcpu
,
1880 APIC_DEFAULT_PHYS_BASE
| MSR_IA32_APICBASE_ENABLE
);
1882 static_key_slow_inc(&apic_sw_disabled
.key
); /* sw disabled at reset */
1883 kvm_lapic_reset(vcpu
, false);
1884 kvm_iodevice_init(&apic
->dev
, &apic_mmio_ops
);
1893 int kvm_apic_has_interrupt(struct kvm_vcpu
*vcpu
)
1895 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
1898 if (!apic_enabled(apic
))
1901 apic_update_ppr(apic
);
1902 highest_irr
= apic_find_highest_irr(apic
);
1903 if ((highest_irr
== -1) ||
1904 ((highest_irr
& 0xF0) <= kvm_apic_get_reg(apic
, APIC_PROCPRI
)))
1909 int kvm_apic_accept_pic_intr(struct kvm_vcpu
*vcpu
)
1911 u32 lvt0
= kvm_apic_get_reg(vcpu
->arch
.apic
, APIC_LVT0
);
1914 if (!kvm_apic_hw_enabled(vcpu
->arch
.apic
))
1916 if ((lvt0
& APIC_LVT_MASKED
) == 0 &&
1917 GET_APIC_DELIVERY_MODE(lvt0
) == APIC_MODE_EXTINT
)
1922 void kvm_inject_apic_timer_irqs(struct kvm_vcpu
*vcpu
)
1924 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
1926 if (atomic_read(&apic
->lapic_timer
.pending
) > 0) {
1927 kvm_apic_local_deliver(apic
, APIC_LVTT
);
1928 if (apic_lvtt_tscdeadline(apic
))
1929 apic
->lapic_timer
.tscdeadline
= 0;
1930 atomic_set(&apic
->lapic_timer
.pending
, 0);
1934 int kvm_get_apic_interrupt(struct kvm_vcpu
*vcpu
)
1936 int vector
= kvm_apic_has_interrupt(vcpu
);
1937 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
1943 * We get here even with APIC virtualization enabled, if doing
1944 * nested virtualization and L1 runs with the "acknowledge interrupt
1945 * on exit" mode. Then we cannot inject the interrupt via RVI,
1946 * because the process would deliver it through the IDT.
1949 apic_set_isr(vector
, apic
);
1950 apic_update_ppr(apic
);
1951 apic_clear_irr(vector
, apic
);
1953 if (test_bit(vector
, vcpu_to_synic(vcpu
)->auto_eoi_bitmap
)) {
1954 apic_clear_isr(vector
, apic
);
1955 apic_update_ppr(apic
);
1961 void kvm_apic_post_state_restore(struct kvm_vcpu
*vcpu
,
1962 struct kvm_lapic_state
*s
)
1964 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
1966 kvm_lapic_set_base(vcpu
, vcpu
->arch
.apic_base
);
1967 /* set SPIV separately to get count of SW disabled APICs right */
1968 apic_set_spiv(apic
, *((u32
*)(s
->regs
+ APIC_SPIV
)));
1969 memcpy(vcpu
->arch
.apic
->regs
, s
->regs
, sizeof *s
);
1970 /* call kvm_apic_set_id() to put apic into apic_map */
1971 kvm_apic_set_id(apic
, kvm_apic_id(apic
));
1972 kvm_apic_set_version(vcpu
);
1974 apic_update_ppr(apic
);
1975 hrtimer_cancel(&apic
->lapic_timer
.timer
);
1976 apic_update_lvtt(apic
);
1977 apic_manage_nmi_watchdog(apic
, kvm_apic_get_reg(apic
, APIC_LVT0
));
1978 update_divide_count(apic
);
1979 start_apic_timer(apic
);
1980 apic
->irr_pending
= true;
1981 apic
->isr_count
= vcpu
->arch
.apicv_active
?
1982 1 : count_vectors(apic
->regs
+ APIC_ISR
);
1983 apic
->highest_isr_cache
= -1;
1984 if (vcpu
->arch
.apicv_active
) {
1985 kvm_x86_ops
->hwapic_irr_update(vcpu
,
1986 apic_find_highest_irr(apic
));
1987 kvm_x86_ops
->hwapic_isr_update(vcpu
->kvm
,
1988 apic_find_highest_isr(apic
));
1990 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
1991 if (ioapic_in_kernel(vcpu
->kvm
))
1992 kvm_rtc_eoi_tracking_restore_one(vcpu
);
1994 vcpu
->arch
.apic_arb_prio
= 0;
1997 void __kvm_migrate_apic_timer(struct kvm_vcpu
*vcpu
)
1999 struct hrtimer
*timer
;
2001 if (!lapic_in_kernel(vcpu
))
2004 timer
= &vcpu
->arch
.apic
->lapic_timer
.timer
;
2005 if (hrtimer_cancel(timer
))
2006 hrtimer_start_expires(timer
, HRTIMER_MODE_ABS_PINNED
);
2010 * apic_sync_pv_eoi_from_guest - called on vmexit or cancel interrupt
2012 * Detect whether guest triggered PV EOI since the
2013 * last entry. If yes, set EOI on guests's behalf.
2014 * Clear PV EOI in guest memory in any case.
2016 static void apic_sync_pv_eoi_from_guest(struct kvm_vcpu
*vcpu
,
2017 struct kvm_lapic
*apic
)
2022 * PV EOI state is derived from KVM_APIC_PV_EOI_PENDING in host
2023 * and KVM_PV_EOI_ENABLED in guest memory as follows:
2025 * KVM_APIC_PV_EOI_PENDING is unset:
2026 * -> host disabled PV EOI.
2027 * KVM_APIC_PV_EOI_PENDING is set, KVM_PV_EOI_ENABLED is set:
2028 * -> host enabled PV EOI, guest did not execute EOI yet.
2029 * KVM_APIC_PV_EOI_PENDING is set, KVM_PV_EOI_ENABLED is unset:
2030 * -> host enabled PV EOI, guest executed EOI.
2032 BUG_ON(!pv_eoi_enabled(vcpu
));
2033 pending
= pv_eoi_get_pending(vcpu
);
2035 * Clear pending bit in any case: it will be set again on vmentry.
2036 * While this might not be ideal from performance point of view,
2037 * this makes sure pv eoi is only enabled when we know it's safe.
2039 pv_eoi_clr_pending(vcpu
);
2042 vector
= apic_set_eoi(apic
);
2043 trace_kvm_pv_eoi(apic
, vector
);
2046 void kvm_lapic_sync_from_vapic(struct kvm_vcpu
*vcpu
)
2050 if (test_bit(KVM_APIC_PV_EOI_PENDING
, &vcpu
->arch
.apic_attention
))
2051 apic_sync_pv_eoi_from_guest(vcpu
, vcpu
->arch
.apic
);
2053 if (!test_bit(KVM_APIC_CHECK_VAPIC
, &vcpu
->arch
.apic_attention
))
2056 if (kvm_read_guest_cached(vcpu
->kvm
, &vcpu
->arch
.apic
->vapic_cache
, &data
,
2060 apic_set_tpr(vcpu
->arch
.apic
, data
& 0xff);
2064 * apic_sync_pv_eoi_to_guest - called before vmentry
2066 * Detect whether it's safe to enable PV EOI and
2069 static void apic_sync_pv_eoi_to_guest(struct kvm_vcpu
*vcpu
,
2070 struct kvm_lapic
*apic
)
2072 if (!pv_eoi_enabled(vcpu
) ||
2073 /* IRR set or many bits in ISR: could be nested. */
2074 apic
->irr_pending
||
2075 /* Cache not set: could be safe but we don't bother. */
2076 apic
->highest_isr_cache
== -1 ||
2077 /* Need EOI to update ioapic. */
2078 kvm_ioapic_handles_vector(apic
, apic
->highest_isr_cache
)) {
2080 * PV EOI was disabled by apic_sync_pv_eoi_from_guest
2081 * so we need not do anything here.
2086 pv_eoi_set_pending(apic
->vcpu
);
2089 void kvm_lapic_sync_to_vapic(struct kvm_vcpu
*vcpu
)
2092 int max_irr
, max_isr
;
2093 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
2095 apic_sync_pv_eoi_to_guest(vcpu
, apic
);
2097 if (!test_bit(KVM_APIC_CHECK_VAPIC
, &vcpu
->arch
.apic_attention
))
2100 tpr
= kvm_apic_get_reg(apic
, APIC_TASKPRI
) & 0xff;
2101 max_irr
= apic_find_highest_irr(apic
);
2104 max_isr
= apic_find_highest_isr(apic
);
2107 data
= (tpr
& 0xff) | ((max_isr
& 0xf0) << 8) | (max_irr
<< 24);
2109 kvm_write_guest_cached(vcpu
->kvm
, &vcpu
->arch
.apic
->vapic_cache
, &data
,
2113 int kvm_lapic_set_vapic_addr(struct kvm_vcpu
*vcpu
, gpa_t vapic_addr
)
2116 if (kvm_gfn_to_hva_cache_init(vcpu
->kvm
,
2117 &vcpu
->arch
.apic
->vapic_cache
,
2118 vapic_addr
, sizeof(u32
)))
2120 __set_bit(KVM_APIC_CHECK_VAPIC
, &vcpu
->arch
.apic_attention
);
2122 __clear_bit(KVM_APIC_CHECK_VAPIC
, &vcpu
->arch
.apic_attention
);
2125 vcpu
->arch
.apic
->vapic_addr
= vapic_addr
;
2129 int kvm_x2apic_msr_write(struct kvm_vcpu
*vcpu
, u32 msr
, u64 data
)
2131 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
2132 u32 reg
= (msr
- APIC_BASE_MSR
) << 4;
2134 if (!lapic_in_kernel(vcpu
) || !apic_x2apic_mode(apic
))
2137 if (reg
== APIC_ICR2
)
2140 /* if this is ICR write vector before command */
2141 if (reg
== APIC_ICR
)
2142 apic_reg_write(apic
, APIC_ICR2
, (u32
)(data
>> 32));
2143 return apic_reg_write(apic
, reg
, (u32
)data
);
2146 int kvm_x2apic_msr_read(struct kvm_vcpu
*vcpu
, u32 msr
, u64
*data
)
2148 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
2149 u32 reg
= (msr
- APIC_BASE_MSR
) << 4, low
, high
= 0;
2151 if (!lapic_in_kernel(vcpu
) || !apic_x2apic_mode(apic
))
2154 if (reg
== APIC_DFR
|| reg
== APIC_ICR2
) {
2155 apic_debug("KVM_APIC_READ: read x2apic reserved register %x\n",
2160 if (apic_reg_read(apic
, reg
, 4, &low
))
2162 if (reg
== APIC_ICR
)
2163 apic_reg_read(apic
, APIC_ICR2
, 4, &high
);
2165 *data
= (((u64
)high
) << 32) | low
;
2170 int kvm_hv_vapic_msr_write(struct kvm_vcpu
*vcpu
, u32 reg
, u64 data
)
2172 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
2174 if (!lapic_in_kernel(vcpu
))
2177 /* if this is ICR write vector before command */
2178 if (reg
== APIC_ICR
)
2179 apic_reg_write(apic
, APIC_ICR2
, (u32
)(data
>> 32));
2180 return apic_reg_write(apic
, reg
, (u32
)data
);
2183 int kvm_hv_vapic_msr_read(struct kvm_vcpu
*vcpu
, u32 reg
, u64
*data
)
2185 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
2188 if (!lapic_in_kernel(vcpu
))
2191 if (apic_reg_read(apic
, reg
, 4, &low
))
2193 if (reg
== APIC_ICR
)
2194 apic_reg_read(apic
, APIC_ICR2
, 4, &high
);
2196 *data
= (((u64
)high
) << 32) | low
;
2201 int kvm_lapic_enable_pv_eoi(struct kvm_vcpu
*vcpu
, u64 data
)
2203 u64 addr
= data
& ~KVM_MSR_ENABLED
;
2204 if (!IS_ALIGNED(addr
, 4))
2207 vcpu
->arch
.pv_eoi
.msr_val
= data
;
2208 if (!pv_eoi_enabled(vcpu
))
2210 return kvm_gfn_to_hva_cache_init(vcpu
->kvm
, &vcpu
->arch
.pv_eoi
.data
,
2214 void kvm_apic_accept_events(struct kvm_vcpu
*vcpu
)
2216 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
2220 if (!lapic_in_kernel(vcpu
) || !apic
->pending_events
)
2224 * INITs are latched while in SMM. Because an SMM CPU cannot
2225 * be in KVM_MP_STATE_INIT_RECEIVED state, just eat SIPIs
2226 * and delay processing of INIT until the next RSM.
2229 WARN_ON_ONCE(vcpu
->arch
.mp_state
== KVM_MP_STATE_INIT_RECEIVED
);
2230 if (test_bit(KVM_APIC_SIPI
, &apic
->pending_events
))
2231 clear_bit(KVM_APIC_SIPI
, &apic
->pending_events
);
2235 pe
= xchg(&apic
->pending_events
, 0);
2236 if (test_bit(KVM_APIC_INIT
, &pe
)) {
2237 kvm_lapic_reset(vcpu
, true);
2238 kvm_vcpu_reset(vcpu
, true);
2239 if (kvm_vcpu_is_bsp(apic
->vcpu
))
2240 vcpu
->arch
.mp_state
= KVM_MP_STATE_RUNNABLE
;
2242 vcpu
->arch
.mp_state
= KVM_MP_STATE_INIT_RECEIVED
;
2244 if (test_bit(KVM_APIC_SIPI
, &pe
) &&
2245 vcpu
->arch
.mp_state
== KVM_MP_STATE_INIT_RECEIVED
) {
2246 /* evaluate pending_events before reading the vector */
2248 sipi_vector
= apic
->sipi_vector
;
2249 apic_debug("vcpu %d received sipi with vector # %x\n",
2250 vcpu
->vcpu_id
, sipi_vector
);
2251 kvm_vcpu_deliver_sipi_vector(vcpu
, sipi_vector
);
2252 vcpu
->arch
.mp_state
= KVM_MP_STATE_RUNNABLE
;
2256 void kvm_lapic_init(void)
2258 /* do not patch jump label more than once per second */
2259 jump_label_rate_limit(&apic_hw_disabled
, HZ
);
2260 jump_label_rate_limit(&apic_sw_disabled
, HZ
);