1 // SPDX-License-Identifier: GPL-2.0-only
4 * Local APIC virtualization
6 * Copyright (C) 2006 Qumranet, Inc.
7 * Copyright (C) 2007 Novell
8 * Copyright (C) 2007 Intel
9 * Copyright 2009 Red Hat, Inc. and/or its affiliates.
12 * Dor Laor <dor.laor@qumranet.com>
13 * Gregory Haskins <ghaskins@novell.com>
14 * Yaozu (Eddie) Dong <eddie.dong@intel.com>
16 * Based on Xen 3.1 code, Copyright (c) 2004, Intel Corporation.
19 #include <linux/kvm_host.h>
20 #include <linux/kvm.h>
22 #include <linux/highmem.h>
23 #include <linux/smp.h>
24 #include <linux/hrtimer.h>
26 #include <linux/export.h>
27 #include <linux/math64.h>
28 #include <linux/slab.h>
29 #include <asm/processor.h>
32 #include <asm/current.h>
33 #include <asm/apicdef.h>
34 #include <asm/delay.h>
35 #include <linux/atomic.h>
36 #include <linux/jump_label.h>
37 #include "kvm_cache_regs.h"
45 #define mod_64(x, y) ((x) - (y) * div64_u64(x, y))
47 #define mod_64(x, y) ((x) % (y))
55 /* 14 is the version for Xeon and Pentium 8.4.8*/
56 #define APIC_VERSION (0x14UL | ((KVM_APIC_LVT_NUM - 1) << 16))
57 #define LAPIC_MMIO_LENGTH (1 << 12)
58 /* followed define is not in apicdef.h */
59 #define APIC_SHORT_MASK 0xc0000
60 #define APIC_DEST_NOSHORT 0x0
61 #define APIC_DEST_MASK 0x800
62 #define MAX_APIC_VECTOR 256
63 #define APIC_VECTORS_PER_REG 32
65 #define APIC_BROADCAST 0xFF
66 #define X2APIC_BROADCAST 0xFFFFFFFFul
68 static bool lapic_timer_advance_dynamic __read_mostly
;
69 #define LAPIC_TIMER_ADVANCE_ADJUST_MIN 100 /* clock cycles */
70 #define LAPIC_TIMER_ADVANCE_ADJUST_MAX 10000 /* clock cycles */
71 #define LAPIC_TIMER_ADVANCE_NS_INIT 1000
72 #define LAPIC_TIMER_ADVANCE_NS_MAX 5000
73 /* step-by-step approximation to mitigate fluctuation */
74 #define LAPIC_TIMER_ADVANCE_ADJUST_STEP 8
76 static inline int apic_test_vector(int vec
, void *bitmap
)
78 return test_bit(VEC_POS(vec
), (bitmap
) + REG_POS(vec
));
81 bool kvm_apic_pending_eoi(struct kvm_vcpu
*vcpu
, int vector
)
83 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
85 return apic_test_vector(vector
, apic
->regs
+ APIC_ISR
) ||
86 apic_test_vector(vector
, apic
->regs
+ APIC_IRR
);
89 static inline int __apic_test_and_set_vector(int vec
, void *bitmap
)
91 return __test_and_set_bit(VEC_POS(vec
), (bitmap
) + REG_POS(vec
));
94 static inline int __apic_test_and_clear_vector(int vec
, void *bitmap
)
96 return __test_and_clear_bit(VEC_POS(vec
), (bitmap
) + REG_POS(vec
));
99 struct static_key_deferred apic_hw_disabled __read_mostly
;
100 struct static_key_deferred apic_sw_disabled __read_mostly
;
102 static inline int apic_enabled(struct kvm_lapic
*apic
)
104 return kvm_apic_sw_enabled(apic
) && kvm_apic_hw_enabled(apic
);
108 (APIC_LVT_MASKED | APIC_SEND_PENDING | APIC_VECTOR_MASK)
111 (LVT_MASK | APIC_MODE_MASK | APIC_INPUT_POLARITY | \
112 APIC_LVT_REMOTE_IRR | APIC_LVT_LEVEL_TRIGGER)
114 static inline u8
kvm_xapic_id(struct kvm_lapic
*apic
)
116 return kvm_lapic_get_reg(apic
, APIC_ID
) >> 24;
119 static inline u32
kvm_x2apic_id(struct kvm_lapic
*apic
)
121 return apic
->vcpu
->vcpu_id
;
124 bool kvm_can_post_timer_interrupt(struct kvm_vcpu
*vcpu
)
126 return pi_inject_timer
&& kvm_vcpu_apicv_active(vcpu
);
128 EXPORT_SYMBOL_GPL(kvm_can_post_timer_interrupt
);
130 static bool kvm_use_posted_timer_interrupt(struct kvm_vcpu
*vcpu
)
132 return kvm_can_post_timer_interrupt(vcpu
) && vcpu
->mode
== IN_GUEST_MODE
;
135 static inline bool kvm_apic_map_get_logical_dest(struct kvm_apic_map
*map
,
136 u32 dest_id
, struct kvm_lapic
***cluster
, u16
*mask
) {
138 case KVM_APIC_MODE_X2APIC
: {
139 u32 offset
= (dest_id
>> 16) * 16;
140 u32 max_apic_id
= map
->max_apic_id
;
142 if (offset
<= max_apic_id
) {
143 u8 cluster_size
= min(max_apic_id
- offset
+ 1, 16U);
145 offset
= array_index_nospec(offset
, map
->max_apic_id
+ 1);
146 *cluster
= &map
->phys_map
[offset
];
147 *mask
= dest_id
& (0xffff >> (16 - cluster_size
));
154 case KVM_APIC_MODE_XAPIC_FLAT
:
155 *cluster
= map
->xapic_flat_map
;
156 *mask
= dest_id
& 0xff;
158 case KVM_APIC_MODE_XAPIC_CLUSTER
:
159 *cluster
= map
->xapic_cluster_map
[(dest_id
>> 4) & 0xf];
160 *mask
= dest_id
& 0xf;
168 static void kvm_apic_map_free(struct rcu_head
*rcu
)
170 struct kvm_apic_map
*map
= container_of(rcu
, struct kvm_apic_map
, rcu
);
175 static void recalculate_apic_map(struct kvm
*kvm
)
177 struct kvm_apic_map
*new, *old
= NULL
;
178 struct kvm_vcpu
*vcpu
;
180 u32 max_id
= 255; /* enough space for any xAPIC ID */
182 mutex_lock(&kvm
->arch
.apic_map_lock
);
184 kvm_for_each_vcpu(i
, vcpu
, kvm
)
185 if (kvm_apic_present(vcpu
))
186 max_id
= max(max_id
, kvm_x2apic_id(vcpu
->arch
.apic
));
188 new = kvzalloc(sizeof(struct kvm_apic_map
) +
189 sizeof(struct kvm_lapic
*) * ((u64
)max_id
+ 1),
195 new->max_apic_id
= max_id
;
197 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
198 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
199 struct kvm_lapic
**cluster
;
205 if (!kvm_apic_present(vcpu
))
208 xapic_id
= kvm_xapic_id(apic
);
209 x2apic_id
= kvm_x2apic_id(apic
);
211 /* Hotplug hack: see kvm_apic_match_physical_addr(), ... */
212 if ((apic_x2apic_mode(apic
) || x2apic_id
> 0xff) &&
213 x2apic_id
<= new->max_apic_id
)
214 new->phys_map
[x2apic_id
] = apic
;
216 * ... xAPIC ID of VCPUs with APIC ID > 0xff will wrap-around,
217 * prevent them from masking VCPUs with APIC ID <= 0xff.
219 if (!apic_x2apic_mode(apic
) && !new->phys_map
[xapic_id
])
220 new->phys_map
[xapic_id
] = apic
;
222 if (!kvm_apic_sw_enabled(apic
))
225 ldr
= kvm_lapic_get_reg(apic
, APIC_LDR
);
227 if (apic_x2apic_mode(apic
)) {
228 new->mode
|= KVM_APIC_MODE_X2APIC
;
230 ldr
= GET_APIC_LOGICAL_ID(ldr
);
231 if (kvm_lapic_get_reg(apic
, APIC_DFR
) == APIC_DFR_FLAT
)
232 new->mode
|= KVM_APIC_MODE_XAPIC_FLAT
;
234 new->mode
|= KVM_APIC_MODE_XAPIC_CLUSTER
;
237 if (!kvm_apic_map_get_logical_dest(new, ldr
, &cluster
, &mask
))
241 cluster
[ffs(mask
) - 1] = apic
;
244 old
= rcu_dereference_protected(kvm
->arch
.apic_map
,
245 lockdep_is_held(&kvm
->arch
.apic_map_lock
));
246 rcu_assign_pointer(kvm
->arch
.apic_map
, new);
247 mutex_unlock(&kvm
->arch
.apic_map_lock
);
250 call_rcu(&old
->rcu
, kvm_apic_map_free
);
252 kvm_make_scan_ioapic_request(kvm
);
255 static inline void apic_set_spiv(struct kvm_lapic
*apic
, u32 val
)
257 bool enabled
= val
& APIC_SPIV_APIC_ENABLED
;
259 kvm_lapic_set_reg(apic
, APIC_SPIV
, val
);
261 if (enabled
!= apic
->sw_enabled
) {
262 apic
->sw_enabled
= enabled
;
264 static_key_slow_dec_deferred(&apic_sw_disabled
);
266 static_key_slow_inc(&apic_sw_disabled
.key
);
268 recalculate_apic_map(apic
->vcpu
->kvm
);
272 static inline void kvm_apic_set_xapic_id(struct kvm_lapic
*apic
, u8 id
)
274 kvm_lapic_set_reg(apic
, APIC_ID
, id
<< 24);
275 recalculate_apic_map(apic
->vcpu
->kvm
);
278 static inline void kvm_apic_set_ldr(struct kvm_lapic
*apic
, u32 id
)
280 kvm_lapic_set_reg(apic
, APIC_LDR
, id
);
281 recalculate_apic_map(apic
->vcpu
->kvm
);
284 static inline u32
kvm_apic_calc_x2apic_ldr(u32 id
)
286 return ((id
>> 4) << 16) | (1 << (id
& 0xf));
289 static inline void kvm_apic_set_x2apic_id(struct kvm_lapic
*apic
, u32 id
)
291 u32 ldr
= kvm_apic_calc_x2apic_ldr(id
);
293 WARN_ON_ONCE(id
!= apic
->vcpu
->vcpu_id
);
295 kvm_lapic_set_reg(apic
, APIC_ID
, id
);
296 kvm_lapic_set_reg(apic
, APIC_LDR
, ldr
);
297 recalculate_apic_map(apic
->vcpu
->kvm
);
300 static inline int apic_lvt_enabled(struct kvm_lapic
*apic
, int lvt_type
)
302 return !(kvm_lapic_get_reg(apic
, lvt_type
) & APIC_LVT_MASKED
);
305 static inline int apic_lvt_vector(struct kvm_lapic
*apic
, int lvt_type
)
307 return kvm_lapic_get_reg(apic
, lvt_type
) & APIC_VECTOR_MASK
;
310 static inline int apic_lvtt_oneshot(struct kvm_lapic
*apic
)
312 return apic
->lapic_timer
.timer_mode
== APIC_LVT_TIMER_ONESHOT
;
315 static inline int apic_lvtt_period(struct kvm_lapic
*apic
)
317 return apic
->lapic_timer
.timer_mode
== APIC_LVT_TIMER_PERIODIC
;
320 static inline int apic_lvtt_tscdeadline(struct kvm_lapic
*apic
)
322 return apic
->lapic_timer
.timer_mode
== APIC_LVT_TIMER_TSCDEADLINE
;
325 static inline int apic_lvt_nmi_mode(u32 lvt_val
)
327 return (lvt_val
& (APIC_MODE_MASK
| APIC_LVT_MASKED
)) == APIC_DM_NMI
;
330 void kvm_apic_set_version(struct kvm_vcpu
*vcpu
)
332 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
333 struct kvm_cpuid_entry2
*feat
;
334 u32 v
= APIC_VERSION
;
336 if (!lapic_in_kernel(vcpu
))
340 * KVM emulates 82093AA datasheet (with in-kernel IOAPIC implementation)
341 * which doesn't have EOI register; Some buggy OSes (e.g. Windows with
342 * Hyper-V role) disable EOI broadcast in lapic not checking for IOAPIC
343 * version first and level-triggered interrupts never get EOIed in
346 feat
= kvm_find_cpuid_entry(apic
->vcpu
, 0x1, 0);
347 if (feat
&& (feat
->ecx
& (1 << (X86_FEATURE_X2APIC
& 31))) &&
348 !ioapic_in_kernel(vcpu
->kvm
))
349 v
|= APIC_LVR_DIRECTED_EOI
;
350 kvm_lapic_set_reg(apic
, APIC_LVR
, v
);
353 static const unsigned int apic_lvt_mask
[KVM_APIC_LVT_NUM
] = {
354 LVT_MASK
, /* part LVTT mask, timer mode mask added at runtime */
355 LVT_MASK
| APIC_MODE_MASK
, /* LVTTHMR */
356 LVT_MASK
| APIC_MODE_MASK
, /* LVTPC */
357 LINT_MASK
, LINT_MASK
, /* LVT0-1 */
358 LVT_MASK
/* LVTERR */
361 static int find_highest_vector(void *bitmap
)
366 for (vec
= MAX_APIC_VECTOR
- APIC_VECTORS_PER_REG
;
367 vec
>= 0; vec
-= APIC_VECTORS_PER_REG
) {
368 reg
= bitmap
+ REG_POS(vec
);
370 return __fls(*reg
) + vec
;
376 static u8
count_vectors(void *bitmap
)
382 for (vec
= 0; vec
< MAX_APIC_VECTOR
; vec
+= APIC_VECTORS_PER_REG
) {
383 reg
= bitmap
+ REG_POS(vec
);
384 count
+= hweight32(*reg
);
390 bool __kvm_apic_update_irr(u32
*pir
, void *regs
, int *max_irr
)
393 u32 pir_val
, irr_val
, prev_irr_val
;
396 max_updated_irr
= -1;
399 for (i
= vec
= 0; i
<= 7; i
++, vec
+= 32) {
400 pir_val
= READ_ONCE(pir
[i
]);
401 irr_val
= *((u32
*)(regs
+ APIC_IRR
+ i
* 0x10));
403 prev_irr_val
= irr_val
;
404 irr_val
|= xchg(&pir
[i
], 0);
405 *((u32
*)(regs
+ APIC_IRR
+ i
* 0x10)) = irr_val
;
406 if (prev_irr_val
!= irr_val
) {
408 __fls(irr_val
^ prev_irr_val
) + vec
;
412 *max_irr
= __fls(irr_val
) + vec
;
415 return ((max_updated_irr
!= -1) &&
416 (max_updated_irr
== *max_irr
));
418 EXPORT_SYMBOL_GPL(__kvm_apic_update_irr
);
420 bool kvm_apic_update_irr(struct kvm_vcpu
*vcpu
, u32
*pir
, int *max_irr
)
422 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
424 return __kvm_apic_update_irr(pir
, apic
->regs
, max_irr
);
426 EXPORT_SYMBOL_GPL(kvm_apic_update_irr
);
428 static inline int apic_search_irr(struct kvm_lapic
*apic
)
430 return find_highest_vector(apic
->regs
+ APIC_IRR
);
433 static inline int apic_find_highest_irr(struct kvm_lapic
*apic
)
438 * Note that irr_pending is just a hint. It will be always
439 * true with virtual interrupt delivery enabled.
441 if (!apic
->irr_pending
)
444 result
= apic_search_irr(apic
);
445 ASSERT(result
== -1 || result
>= 16);
450 static inline void apic_clear_irr(int vec
, struct kvm_lapic
*apic
)
452 struct kvm_vcpu
*vcpu
;
456 if (unlikely(vcpu
->arch
.apicv_active
)) {
457 /* need to update RVI */
458 kvm_lapic_clear_vector(vec
, apic
->regs
+ APIC_IRR
);
459 kvm_x86_ops
->hwapic_irr_update(vcpu
,
460 apic_find_highest_irr(apic
));
462 apic
->irr_pending
= false;
463 kvm_lapic_clear_vector(vec
, apic
->regs
+ APIC_IRR
);
464 if (apic_search_irr(apic
) != -1)
465 apic
->irr_pending
= true;
469 static inline void apic_set_isr(int vec
, struct kvm_lapic
*apic
)
471 struct kvm_vcpu
*vcpu
;
473 if (__apic_test_and_set_vector(vec
, apic
->regs
+ APIC_ISR
))
479 * With APIC virtualization enabled, all caching is disabled
480 * because the processor can modify ISR under the hood. Instead
483 if (unlikely(vcpu
->arch
.apicv_active
))
484 kvm_x86_ops
->hwapic_isr_update(vcpu
, vec
);
487 BUG_ON(apic
->isr_count
> MAX_APIC_VECTOR
);
489 * ISR (in service register) bit is set when injecting an interrupt.
490 * The highest vector is injected. Thus the latest bit set matches
491 * the highest bit in ISR.
493 apic
->highest_isr_cache
= vec
;
497 static inline int apic_find_highest_isr(struct kvm_lapic
*apic
)
502 * Note that isr_count is always 1, and highest_isr_cache
503 * is always -1, with APIC virtualization enabled.
505 if (!apic
->isr_count
)
507 if (likely(apic
->highest_isr_cache
!= -1))
508 return apic
->highest_isr_cache
;
510 result
= find_highest_vector(apic
->regs
+ APIC_ISR
);
511 ASSERT(result
== -1 || result
>= 16);
516 static inline void apic_clear_isr(int vec
, struct kvm_lapic
*apic
)
518 struct kvm_vcpu
*vcpu
;
519 if (!__apic_test_and_clear_vector(vec
, apic
->regs
+ APIC_ISR
))
525 * We do get here for APIC virtualization enabled if the guest
526 * uses the Hyper-V APIC enlightenment. In this case we may need
527 * to trigger a new interrupt delivery by writing the SVI field;
528 * on the other hand isr_count and highest_isr_cache are unused
529 * and must be left alone.
531 if (unlikely(vcpu
->arch
.apicv_active
))
532 kvm_x86_ops
->hwapic_isr_update(vcpu
,
533 apic_find_highest_isr(apic
));
536 BUG_ON(apic
->isr_count
< 0);
537 apic
->highest_isr_cache
= -1;
541 int kvm_lapic_find_highest_irr(struct kvm_vcpu
*vcpu
)
543 /* This may race with setting of irr in __apic_accept_irq() and
544 * value returned may be wrong, but kvm_vcpu_kick() in __apic_accept_irq
545 * will cause vmexit immediately and the value will be recalculated
546 * on the next vmentry.
548 return apic_find_highest_irr(vcpu
->arch
.apic
);
550 EXPORT_SYMBOL_GPL(kvm_lapic_find_highest_irr
);
552 static int __apic_accept_irq(struct kvm_lapic
*apic
, int delivery_mode
,
553 int vector
, int level
, int trig_mode
,
554 struct dest_map
*dest_map
);
556 int kvm_apic_set_irq(struct kvm_vcpu
*vcpu
, struct kvm_lapic_irq
*irq
,
557 struct dest_map
*dest_map
)
559 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
561 return __apic_accept_irq(apic
, irq
->delivery_mode
, irq
->vector
,
562 irq
->level
, irq
->trig_mode
, dest_map
);
565 int kvm_pv_send_ipi(struct kvm
*kvm
, unsigned long ipi_bitmap_low
,
566 unsigned long ipi_bitmap_high
, u32 min
,
567 unsigned long icr
, int op_64_bit
)
570 struct kvm_apic_map
*map
;
571 struct kvm_vcpu
*vcpu
;
572 struct kvm_lapic_irq irq
= {0};
573 int cluster_size
= op_64_bit
? 64 : 32;
576 irq
.vector
= icr
& APIC_VECTOR_MASK
;
577 irq
.delivery_mode
= icr
& APIC_MODE_MASK
;
578 irq
.level
= (icr
& APIC_INT_ASSERT
) != 0;
579 irq
.trig_mode
= icr
& APIC_INT_LEVELTRIG
;
581 if (icr
& APIC_DEST_MASK
)
583 if (icr
& APIC_SHORT_MASK
)
587 map
= rcu_dereference(kvm
->arch
.apic_map
);
589 if (unlikely(!map
)) {
594 if (min
> map
->max_apic_id
)
596 /* Bits above cluster_size are masked in the caller. */
597 for_each_set_bit(i
, &ipi_bitmap_low
,
598 min((u32
)BITS_PER_LONG
, (map
->max_apic_id
- min
+ 1))) {
599 if (map
->phys_map
[min
+ i
]) {
600 vcpu
= map
->phys_map
[min
+ i
]->vcpu
;
601 count
+= kvm_apic_set_irq(vcpu
, &irq
, NULL
);
607 if (min
> map
->max_apic_id
)
610 for_each_set_bit(i
, &ipi_bitmap_high
,
611 min((u32
)BITS_PER_LONG
, (map
->max_apic_id
- min
+ 1))) {
612 if (map
->phys_map
[min
+ i
]) {
613 vcpu
= map
->phys_map
[min
+ i
]->vcpu
;
614 count
+= kvm_apic_set_irq(vcpu
, &irq
, NULL
);
623 static int pv_eoi_put_user(struct kvm_vcpu
*vcpu
, u8 val
)
626 return kvm_write_guest_cached(vcpu
->kvm
, &vcpu
->arch
.pv_eoi
.data
, &val
,
630 static int pv_eoi_get_user(struct kvm_vcpu
*vcpu
, u8
*val
)
633 return kvm_read_guest_cached(vcpu
->kvm
, &vcpu
->arch
.pv_eoi
.data
, val
,
637 static inline bool pv_eoi_enabled(struct kvm_vcpu
*vcpu
)
639 return vcpu
->arch
.pv_eoi
.msr_val
& KVM_MSR_ENABLED
;
642 static bool pv_eoi_get_pending(struct kvm_vcpu
*vcpu
)
645 if (pv_eoi_get_user(vcpu
, &val
) < 0)
646 printk(KERN_WARNING
"Can't read EOI MSR value: 0x%llx\n",
647 (unsigned long long)vcpu
->arch
.pv_eoi
.msr_val
);
651 static void pv_eoi_set_pending(struct kvm_vcpu
*vcpu
)
653 if (pv_eoi_put_user(vcpu
, KVM_PV_EOI_ENABLED
) < 0) {
654 printk(KERN_WARNING
"Can't set EOI MSR value: 0x%llx\n",
655 (unsigned long long)vcpu
->arch
.pv_eoi
.msr_val
);
658 __set_bit(KVM_APIC_PV_EOI_PENDING
, &vcpu
->arch
.apic_attention
);
661 static void pv_eoi_clr_pending(struct kvm_vcpu
*vcpu
)
663 if (pv_eoi_put_user(vcpu
, KVM_PV_EOI_DISABLED
) < 0) {
664 printk(KERN_WARNING
"Can't clear EOI MSR value: 0x%llx\n",
665 (unsigned long long)vcpu
->arch
.pv_eoi
.msr_val
);
668 __clear_bit(KVM_APIC_PV_EOI_PENDING
, &vcpu
->arch
.apic_attention
);
671 static int apic_has_interrupt_for_ppr(struct kvm_lapic
*apic
, u32 ppr
)
674 if (apic
->vcpu
->arch
.apicv_active
)
675 highest_irr
= kvm_x86_ops
->sync_pir_to_irr(apic
->vcpu
);
677 highest_irr
= apic_find_highest_irr(apic
);
678 if (highest_irr
== -1 || (highest_irr
& 0xF0) <= ppr
)
683 static bool __apic_update_ppr(struct kvm_lapic
*apic
, u32
*new_ppr
)
685 u32 tpr
, isrv
, ppr
, old_ppr
;
688 old_ppr
= kvm_lapic_get_reg(apic
, APIC_PROCPRI
);
689 tpr
= kvm_lapic_get_reg(apic
, APIC_TASKPRI
);
690 isr
= apic_find_highest_isr(apic
);
691 isrv
= (isr
!= -1) ? isr
: 0;
693 if ((tpr
& 0xf0) >= (isrv
& 0xf0))
700 kvm_lapic_set_reg(apic
, APIC_PROCPRI
, ppr
);
702 return ppr
< old_ppr
;
705 static void apic_update_ppr(struct kvm_lapic
*apic
)
709 if (__apic_update_ppr(apic
, &ppr
) &&
710 apic_has_interrupt_for_ppr(apic
, ppr
) != -1)
711 kvm_make_request(KVM_REQ_EVENT
, apic
->vcpu
);
714 void kvm_apic_update_ppr(struct kvm_vcpu
*vcpu
)
716 apic_update_ppr(vcpu
->arch
.apic
);
718 EXPORT_SYMBOL_GPL(kvm_apic_update_ppr
);
720 static void apic_set_tpr(struct kvm_lapic
*apic
, u32 tpr
)
722 kvm_lapic_set_reg(apic
, APIC_TASKPRI
, tpr
);
723 apic_update_ppr(apic
);
726 static bool kvm_apic_broadcast(struct kvm_lapic
*apic
, u32 mda
)
728 return mda
== (apic_x2apic_mode(apic
) ?
729 X2APIC_BROADCAST
: APIC_BROADCAST
);
732 static bool kvm_apic_match_physical_addr(struct kvm_lapic
*apic
, u32 mda
)
734 if (kvm_apic_broadcast(apic
, mda
))
737 if (apic_x2apic_mode(apic
))
738 return mda
== kvm_x2apic_id(apic
);
741 * Hotplug hack: Make LAPIC in xAPIC mode also accept interrupts as if
742 * it were in x2APIC mode. Hotplugged VCPUs start in xAPIC mode and
743 * this allows unique addressing of VCPUs with APIC ID over 0xff.
744 * The 0xff condition is needed because writeable xAPIC ID.
746 if (kvm_x2apic_id(apic
) > 0xff && mda
== kvm_x2apic_id(apic
))
749 return mda
== kvm_xapic_id(apic
);
752 static bool kvm_apic_match_logical_addr(struct kvm_lapic
*apic
, u32 mda
)
756 if (kvm_apic_broadcast(apic
, mda
))
759 logical_id
= kvm_lapic_get_reg(apic
, APIC_LDR
);
761 if (apic_x2apic_mode(apic
))
762 return ((logical_id
>> 16) == (mda
>> 16))
763 && (logical_id
& mda
& 0xffff) != 0;
765 logical_id
= GET_APIC_LOGICAL_ID(logical_id
);
767 switch (kvm_lapic_get_reg(apic
, APIC_DFR
)) {
769 return (logical_id
& mda
) != 0;
770 case APIC_DFR_CLUSTER
:
771 return ((logical_id
>> 4) == (mda
>> 4))
772 && (logical_id
& mda
& 0xf) != 0;
778 /* The KVM local APIC implementation has two quirks:
780 * - Real hardware delivers interrupts destined to x2APIC ID > 0xff to LAPICs
781 * in xAPIC mode if the "destination & 0xff" matches its xAPIC ID.
782 * KVM doesn't do that aliasing.
784 * - in-kernel IOAPIC messages have to be delivered directly to
785 * x2APIC, because the kernel does not support interrupt remapping.
786 * In order to support broadcast without interrupt remapping, x2APIC
787 * rewrites the destination of non-IPI messages from APIC_BROADCAST
788 * to X2APIC_BROADCAST.
790 * The broadcast quirk can be disabled with KVM_CAP_X2APIC_API. This is
791 * important when userspace wants to use x2APIC-format MSIs, because
792 * APIC_BROADCAST (0xff) is a legal route for "cluster 0, CPUs 0-7".
794 static u32
kvm_apic_mda(struct kvm_vcpu
*vcpu
, unsigned int dest_id
,
795 struct kvm_lapic
*source
, struct kvm_lapic
*target
)
797 bool ipi
= source
!= NULL
;
799 if (!vcpu
->kvm
->arch
.x2apic_broadcast_quirk_disabled
&&
800 !ipi
&& dest_id
== APIC_BROADCAST
&& apic_x2apic_mode(target
))
801 return X2APIC_BROADCAST
;
806 bool kvm_apic_match_dest(struct kvm_vcpu
*vcpu
, struct kvm_lapic
*source
,
807 int short_hand
, unsigned int dest
, int dest_mode
)
809 struct kvm_lapic
*target
= vcpu
->arch
.apic
;
810 u32 mda
= kvm_apic_mda(vcpu
, dest
, source
, target
);
813 switch (short_hand
) {
814 case APIC_DEST_NOSHORT
:
815 if (dest_mode
== APIC_DEST_PHYSICAL
)
816 return kvm_apic_match_physical_addr(target
, mda
);
818 return kvm_apic_match_logical_addr(target
, mda
);
820 return target
== source
;
821 case APIC_DEST_ALLINC
:
823 case APIC_DEST_ALLBUT
:
824 return target
!= source
;
829 EXPORT_SYMBOL_GPL(kvm_apic_match_dest
);
831 int kvm_vector_to_index(u32 vector
, u32 dest_vcpus
,
832 const unsigned long *bitmap
, u32 bitmap_size
)
837 mod
= vector
% dest_vcpus
;
839 for (i
= 0; i
<= mod
; i
++) {
840 idx
= find_next_bit(bitmap
, bitmap_size
, idx
+ 1);
841 BUG_ON(idx
== bitmap_size
);
847 static void kvm_apic_disabled_lapic_found(struct kvm
*kvm
)
849 if (!kvm
->arch
.disabled_lapic_found
) {
850 kvm
->arch
.disabled_lapic_found
= true;
852 "Disabled LAPIC found during irq injection\n");
856 static bool kvm_apic_is_broadcast_dest(struct kvm
*kvm
, struct kvm_lapic
**src
,
857 struct kvm_lapic_irq
*irq
, struct kvm_apic_map
*map
)
859 if (kvm
->arch
.x2apic_broadcast_quirk_disabled
) {
860 if ((irq
->dest_id
== APIC_BROADCAST
&&
861 map
->mode
!= KVM_APIC_MODE_X2APIC
))
863 if (irq
->dest_id
== X2APIC_BROADCAST
)
866 bool x2apic_ipi
= src
&& *src
&& apic_x2apic_mode(*src
);
867 if (irq
->dest_id
== (x2apic_ipi
?
868 X2APIC_BROADCAST
: APIC_BROADCAST
))
875 /* Return true if the interrupt can be handled by using *bitmap as index mask
876 * for valid destinations in *dst array.
877 * Return false if kvm_apic_map_get_dest_lapic did nothing useful.
878 * Note: we may have zero kvm_lapic destinations when we return true, which
879 * means that the interrupt should be dropped. In this case, *bitmap would be
880 * zero and *dst undefined.
882 static inline bool kvm_apic_map_get_dest_lapic(struct kvm
*kvm
,
883 struct kvm_lapic
**src
, struct kvm_lapic_irq
*irq
,
884 struct kvm_apic_map
*map
, struct kvm_lapic
***dst
,
885 unsigned long *bitmap
)
889 if (irq
->shorthand
== APIC_DEST_SELF
&& src
) {
893 } else if (irq
->shorthand
)
896 if (!map
|| kvm_apic_is_broadcast_dest(kvm
, src
, irq
, map
))
899 if (irq
->dest_mode
== APIC_DEST_PHYSICAL
) {
900 if (irq
->dest_id
> map
->max_apic_id
) {
903 u32 dest_id
= array_index_nospec(irq
->dest_id
, map
->max_apic_id
+ 1);
904 *dst
= &map
->phys_map
[dest_id
];
911 if (!kvm_apic_map_get_logical_dest(map
, irq
->dest_id
, dst
,
915 if (!kvm_lowest_prio_delivery(irq
))
918 if (!kvm_vector_hashing_enabled()) {
920 for_each_set_bit(i
, bitmap
, 16) {
925 else if (kvm_apic_compare_prio((*dst
)[i
]->vcpu
,
926 (*dst
)[lowest
]->vcpu
) < 0)
933 lowest
= kvm_vector_to_index(irq
->vector
, hweight16(*bitmap
),
936 if (!(*dst
)[lowest
]) {
937 kvm_apic_disabled_lapic_found(kvm
);
943 *bitmap
= (lowest
>= 0) ? 1 << lowest
: 0;
948 bool kvm_irq_delivery_to_apic_fast(struct kvm
*kvm
, struct kvm_lapic
*src
,
949 struct kvm_lapic_irq
*irq
, int *r
, struct dest_map
*dest_map
)
951 struct kvm_apic_map
*map
;
952 unsigned long bitmap
;
953 struct kvm_lapic
**dst
= NULL
;
959 if (irq
->shorthand
== APIC_DEST_SELF
) {
960 *r
= kvm_apic_set_irq(src
->vcpu
, irq
, dest_map
);
965 map
= rcu_dereference(kvm
->arch
.apic_map
);
967 ret
= kvm_apic_map_get_dest_lapic(kvm
, &src
, irq
, map
, &dst
, &bitmap
);
970 for_each_set_bit(i
, &bitmap
, 16) {
973 *r
+= kvm_apic_set_irq(dst
[i
]->vcpu
, irq
, dest_map
);
982 * This routine tries to handler interrupts in posted mode, here is how
983 * it deals with different cases:
984 * - For single-destination interrupts, handle it in posted mode
985 * - Else if vector hashing is enabled and it is a lowest-priority
986 * interrupt, handle it in posted mode and use the following mechanism
987 * to find the destinaiton vCPU.
988 * 1. For lowest-priority interrupts, store all the possible
989 * destination vCPUs in an array.
990 * 2. Use "guest vector % max number of destination vCPUs" to find
991 * the right destination vCPU in the array for the lowest-priority
993 * - Otherwise, use remapped mode to inject the interrupt.
995 bool kvm_intr_is_single_vcpu_fast(struct kvm
*kvm
, struct kvm_lapic_irq
*irq
,
996 struct kvm_vcpu
**dest_vcpu
)
998 struct kvm_apic_map
*map
;
999 unsigned long bitmap
;
1000 struct kvm_lapic
**dst
= NULL
;
1007 map
= rcu_dereference(kvm
->arch
.apic_map
);
1009 if (kvm_apic_map_get_dest_lapic(kvm
, NULL
, irq
, map
, &dst
, &bitmap
) &&
1010 hweight16(bitmap
) == 1) {
1011 unsigned long i
= find_first_bit(&bitmap
, 16);
1014 *dest_vcpu
= dst
[i
]->vcpu
;
1024 * Add a pending IRQ into lapic.
1025 * Return 1 if successfully added and 0 if discarded.
1027 static int __apic_accept_irq(struct kvm_lapic
*apic
, int delivery_mode
,
1028 int vector
, int level
, int trig_mode
,
1029 struct dest_map
*dest_map
)
1032 struct kvm_vcpu
*vcpu
= apic
->vcpu
;
1034 trace_kvm_apic_accept_irq(vcpu
->vcpu_id
, delivery_mode
,
1036 switch (delivery_mode
) {
1037 case APIC_DM_LOWEST
:
1038 vcpu
->arch
.apic_arb_prio
++;
1041 if (unlikely(trig_mode
&& !level
))
1044 /* FIXME add logic for vcpu on reset */
1045 if (unlikely(!apic_enabled(apic
)))
1051 __set_bit(vcpu
->vcpu_id
, dest_map
->map
);
1052 dest_map
->vectors
[vcpu
->vcpu_id
] = vector
;
1055 if (apic_test_vector(vector
, apic
->regs
+ APIC_TMR
) != !!trig_mode
) {
1057 kvm_lapic_set_vector(vector
,
1058 apic
->regs
+ APIC_TMR
);
1060 kvm_lapic_clear_vector(vector
,
1061 apic
->regs
+ APIC_TMR
);
1064 if (vcpu
->arch
.apicv_active
)
1065 kvm_x86_ops
->deliver_posted_interrupt(vcpu
, vector
);
1067 kvm_lapic_set_irr(vector
, apic
);
1069 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
1070 kvm_vcpu_kick(vcpu
);
1076 vcpu
->arch
.pv
.pv_unhalted
= 1;
1077 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
1078 kvm_vcpu_kick(vcpu
);
1083 kvm_make_request(KVM_REQ_SMI
, vcpu
);
1084 kvm_vcpu_kick(vcpu
);
1089 kvm_inject_nmi(vcpu
);
1090 kvm_vcpu_kick(vcpu
);
1094 if (!trig_mode
|| level
) {
1096 /* assumes that there are only KVM_APIC_INIT/SIPI */
1097 apic
->pending_events
= (1UL << KVM_APIC_INIT
);
1098 /* make sure pending_events is visible before sending
1101 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
1102 kvm_vcpu_kick(vcpu
);
1106 case APIC_DM_STARTUP
:
1108 apic
->sipi_vector
= vector
;
1109 /* make sure sipi_vector is visible for the receiver */
1111 set_bit(KVM_APIC_SIPI
, &apic
->pending_events
);
1112 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
1113 kvm_vcpu_kick(vcpu
);
1116 case APIC_DM_EXTINT
:
1118 * Should only be called by kvm_apic_local_deliver() with LVT0,
1119 * before NMI watchdog was enabled. Already handled by
1120 * kvm_apic_accept_pic_intr().
1125 printk(KERN_ERR
"TODO: unsupported delivery mode %x\n",
1132 int kvm_apic_compare_prio(struct kvm_vcpu
*vcpu1
, struct kvm_vcpu
*vcpu2
)
1134 return vcpu1
->arch
.apic_arb_prio
- vcpu2
->arch
.apic_arb_prio
;
1137 static bool kvm_ioapic_handles_vector(struct kvm_lapic
*apic
, int vector
)
1139 return test_bit(vector
, apic
->vcpu
->arch
.ioapic_handled_vectors
);
1142 static void kvm_ioapic_send_eoi(struct kvm_lapic
*apic
, int vector
)
1146 /* Eoi the ioapic only if the ioapic doesn't own the vector. */
1147 if (!kvm_ioapic_handles_vector(apic
, vector
))
1150 /* Request a KVM exit to inform the userspace IOAPIC. */
1151 if (irqchip_split(apic
->vcpu
->kvm
)) {
1152 apic
->vcpu
->arch
.pending_ioapic_eoi
= vector
;
1153 kvm_make_request(KVM_REQ_IOAPIC_EOI_EXIT
, apic
->vcpu
);
1157 if (apic_test_vector(vector
, apic
->regs
+ APIC_TMR
))
1158 trigger_mode
= IOAPIC_LEVEL_TRIG
;
1160 trigger_mode
= IOAPIC_EDGE_TRIG
;
1162 kvm_ioapic_update_eoi(apic
->vcpu
, vector
, trigger_mode
);
1165 static int apic_set_eoi(struct kvm_lapic
*apic
)
1167 int vector
= apic_find_highest_isr(apic
);
1169 trace_kvm_eoi(apic
, vector
);
1172 * Not every write EOI will has corresponding ISR,
1173 * one example is when Kernel check timer on setup_IO_APIC
1178 apic_clear_isr(vector
, apic
);
1179 apic_update_ppr(apic
);
1181 if (test_bit(vector
, vcpu_to_synic(apic
->vcpu
)->vec_bitmap
))
1182 kvm_hv_synic_send_eoi(apic
->vcpu
, vector
);
1184 kvm_ioapic_send_eoi(apic
, vector
);
1185 kvm_make_request(KVM_REQ_EVENT
, apic
->vcpu
);
1190 * this interface assumes a trap-like exit, which has already finished
1191 * desired side effect including vISR and vPPR update.
1193 void kvm_apic_set_eoi_accelerated(struct kvm_vcpu
*vcpu
, int vector
)
1195 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
1197 trace_kvm_eoi(apic
, vector
);
1199 kvm_ioapic_send_eoi(apic
, vector
);
1200 kvm_make_request(KVM_REQ_EVENT
, apic
->vcpu
);
1202 EXPORT_SYMBOL_GPL(kvm_apic_set_eoi_accelerated
);
1204 static void apic_send_ipi(struct kvm_lapic
*apic
, u32 icr_low
, u32 icr_high
)
1206 struct kvm_lapic_irq irq
;
1208 irq
.vector
= icr_low
& APIC_VECTOR_MASK
;
1209 irq
.delivery_mode
= icr_low
& APIC_MODE_MASK
;
1210 irq
.dest_mode
= icr_low
& APIC_DEST_MASK
;
1211 irq
.level
= (icr_low
& APIC_INT_ASSERT
) != 0;
1212 irq
.trig_mode
= icr_low
& APIC_INT_LEVELTRIG
;
1213 irq
.shorthand
= icr_low
& APIC_SHORT_MASK
;
1214 irq
.msi_redir_hint
= false;
1215 if (apic_x2apic_mode(apic
))
1216 irq
.dest_id
= icr_high
;
1218 irq
.dest_id
= GET_APIC_DEST_FIELD(icr_high
);
1220 trace_kvm_apic_ipi(icr_low
, irq
.dest_id
);
1222 kvm_irq_delivery_to_apic(apic
->vcpu
->kvm
, apic
, &irq
, NULL
);
1225 static u32
apic_get_tmcct(struct kvm_lapic
*apic
)
1227 ktime_t remaining
, now
;
1231 ASSERT(apic
!= NULL
);
1233 /* if initial count is 0, current count should also be 0 */
1234 if (kvm_lapic_get_reg(apic
, APIC_TMICT
) == 0 ||
1235 apic
->lapic_timer
.period
== 0)
1239 remaining
= ktime_sub(apic
->lapic_timer
.target_expiration
, now
);
1240 if (ktime_to_ns(remaining
) < 0)
1243 ns
= mod_64(ktime_to_ns(remaining
), apic
->lapic_timer
.period
);
1244 tmcct
= div64_u64(ns
,
1245 (APIC_BUS_CYCLE_NS
* apic
->divide_count
));
1250 static void __report_tpr_access(struct kvm_lapic
*apic
, bool write
)
1252 struct kvm_vcpu
*vcpu
= apic
->vcpu
;
1253 struct kvm_run
*run
= vcpu
->run
;
1255 kvm_make_request(KVM_REQ_REPORT_TPR_ACCESS
, vcpu
);
1256 run
->tpr_access
.rip
= kvm_rip_read(vcpu
);
1257 run
->tpr_access
.is_write
= write
;
1260 static inline void report_tpr_access(struct kvm_lapic
*apic
, bool write
)
1262 if (apic
->vcpu
->arch
.tpr_access_reporting
)
1263 __report_tpr_access(apic
, write
);
1266 static u32
__apic_read(struct kvm_lapic
*apic
, unsigned int offset
)
1270 if (offset
>= LAPIC_MMIO_LENGTH
)
1277 case APIC_TMCCT
: /* Timer CCR */
1278 if (apic_lvtt_tscdeadline(apic
))
1281 val
= apic_get_tmcct(apic
);
1284 apic_update_ppr(apic
);
1285 val
= kvm_lapic_get_reg(apic
, offset
);
1288 report_tpr_access(apic
, false);
1291 val
= kvm_lapic_get_reg(apic
, offset
);
1298 static inline struct kvm_lapic
*to_lapic(struct kvm_io_device
*dev
)
1300 return container_of(dev
, struct kvm_lapic
, dev
);
1303 #define APIC_REG_MASK(reg) (1ull << ((reg) >> 4))
1304 #define APIC_REGS_MASK(first, count) \
1305 (APIC_REG_MASK(first) * ((1ull << (count)) - 1))
1307 int kvm_lapic_reg_read(struct kvm_lapic
*apic
, u32 offset
, int len
,
1310 unsigned char alignment
= offset
& 0xf;
1312 /* this bitmask has a bit cleared for each reserved register */
1313 u64 valid_reg_mask
=
1314 APIC_REG_MASK(APIC_ID
) |
1315 APIC_REG_MASK(APIC_LVR
) |
1316 APIC_REG_MASK(APIC_TASKPRI
) |
1317 APIC_REG_MASK(APIC_PROCPRI
) |
1318 APIC_REG_MASK(APIC_LDR
) |
1319 APIC_REG_MASK(APIC_DFR
) |
1320 APIC_REG_MASK(APIC_SPIV
) |
1321 APIC_REGS_MASK(APIC_ISR
, APIC_ISR_NR
) |
1322 APIC_REGS_MASK(APIC_TMR
, APIC_ISR_NR
) |
1323 APIC_REGS_MASK(APIC_IRR
, APIC_ISR_NR
) |
1324 APIC_REG_MASK(APIC_ESR
) |
1325 APIC_REG_MASK(APIC_ICR
) |
1326 APIC_REG_MASK(APIC_ICR2
) |
1327 APIC_REG_MASK(APIC_LVTT
) |
1328 APIC_REG_MASK(APIC_LVTTHMR
) |
1329 APIC_REG_MASK(APIC_LVTPC
) |
1330 APIC_REG_MASK(APIC_LVT0
) |
1331 APIC_REG_MASK(APIC_LVT1
) |
1332 APIC_REG_MASK(APIC_LVTERR
) |
1333 APIC_REG_MASK(APIC_TMICT
) |
1334 APIC_REG_MASK(APIC_TMCCT
) |
1335 APIC_REG_MASK(APIC_TDCR
);
1337 /* ARBPRI is not valid on x2APIC */
1338 if (!apic_x2apic_mode(apic
))
1339 valid_reg_mask
|= APIC_REG_MASK(APIC_ARBPRI
);
1341 if (offset
> 0x3f0 || !(valid_reg_mask
& APIC_REG_MASK(offset
)))
1344 result
= __apic_read(apic
, offset
& ~0xf);
1346 trace_kvm_apic_read(offset
, result
);
1352 memcpy(data
, (char *)&result
+ alignment
, len
);
1355 printk(KERN_ERR
"Local APIC read with len = %x, "
1356 "should be 1,2, or 4 instead\n", len
);
1361 EXPORT_SYMBOL_GPL(kvm_lapic_reg_read
);
1363 static int apic_mmio_in_range(struct kvm_lapic
*apic
, gpa_t addr
)
1365 return addr
>= apic
->base_address
&&
1366 addr
< apic
->base_address
+ LAPIC_MMIO_LENGTH
;
1369 static int apic_mmio_read(struct kvm_vcpu
*vcpu
, struct kvm_io_device
*this,
1370 gpa_t address
, int len
, void *data
)
1372 struct kvm_lapic
*apic
= to_lapic(this);
1373 u32 offset
= address
- apic
->base_address
;
1375 if (!apic_mmio_in_range(apic
, address
))
1378 if (!kvm_apic_hw_enabled(apic
) || apic_x2apic_mode(apic
)) {
1379 if (!kvm_check_has_quirk(vcpu
->kvm
,
1380 KVM_X86_QUIRK_LAPIC_MMIO_HOLE
))
1383 memset(data
, 0xff, len
);
1387 kvm_lapic_reg_read(apic
, offset
, len
, data
);
1392 static void update_divide_count(struct kvm_lapic
*apic
)
1394 u32 tmp1
, tmp2
, tdcr
;
1396 tdcr
= kvm_lapic_get_reg(apic
, APIC_TDCR
);
1398 tmp2
= ((tmp1
& 0x3) | ((tmp1
& 0x8) >> 1)) + 1;
1399 apic
->divide_count
= 0x1 << (tmp2
& 0x7);
1402 static void limit_periodic_timer_frequency(struct kvm_lapic
*apic
)
1405 * Do not allow the guest to program periodic timers with small
1406 * interval, since the hrtimers are not throttled by the host
1409 if (apic_lvtt_period(apic
) && apic
->lapic_timer
.period
) {
1410 s64 min_period
= min_timer_period_us
* 1000LL;
1412 if (apic
->lapic_timer
.period
< min_period
) {
1413 pr_info_ratelimited(
1414 "kvm: vcpu %i: requested %lld ns "
1415 "lapic timer period limited to %lld ns\n",
1416 apic
->vcpu
->vcpu_id
,
1417 apic
->lapic_timer
.period
, min_period
);
1418 apic
->lapic_timer
.period
= min_period
;
1423 static void apic_update_lvtt(struct kvm_lapic
*apic
)
1425 u32 timer_mode
= kvm_lapic_get_reg(apic
, APIC_LVTT
) &
1426 apic
->lapic_timer
.timer_mode_mask
;
1428 if (apic
->lapic_timer
.timer_mode
!= timer_mode
) {
1429 if (apic_lvtt_tscdeadline(apic
) != (timer_mode
==
1430 APIC_LVT_TIMER_TSCDEADLINE
)) {
1431 hrtimer_cancel(&apic
->lapic_timer
.timer
);
1432 kvm_lapic_set_reg(apic
, APIC_TMICT
, 0);
1433 apic
->lapic_timer
.period
= 0;
1434 apic
->lapic_timer
.tscdeadline
= 0;
1436 apic
->lapic_timer
.timer_mode
= timer_mode
;
1437 limit_periodic_timer_frequency(apic
);
1442 * On APICv, this test will cause a busy wait
1443 * during a higher-priority task.
1446 static bool lapic_timer_int_injected(struct kvm_vcpu
*vcpu
)
1448 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
1449 u32 reg
= kvm_lapic_get_reg(apic
, APIC_LVTT
);
1451 if (kvm_apic_hw_enabled(apic
)) {
1452 int vec
= reg
& APIC_VECTOR_MASK
;
1453 void *bitmap
= apic
->regs
+ APIC_ISR
;
1455 if (vcpu
->arch
.apicv_active
)
1456 bitmap
= apic
->regs
+ APIC_IRR
;
1458 if (apic_test_vector(vec
, bitmap
))
1464 static inline void __wait_lapic_expire(struct kvm_vcpu
*vcpu
, u64 guest_cycles
)
1466 u64 timer_advance_ns
= vcpu
->arch
.apic
->lapic_timer
.timer_advance_ns
;
1469 * If the guest TSC is running at a different ratio than the host, then
1470 * convert the delay to nanoseconds to achieve an accurate delay. Note
1471 * that __delay() uses delay_tsc whenever the hardware has TSC, thus
1472 * always for VMX enabled hardware.
1474 if (vcpu
->arch
.tsc_scaling_ratio
== kvm_default_tsc_scaling_ratio
) {
1475 __delay(min(guest_cycles
,
1476 nsec_to_cycles(vcpu
, timer_advance_ns
)));
1478 u64 delay_ns
= guest_cycles
* 1000000ULL;
1479 do_div(delay_ns
, vcpu
->arch
.virtual_tsc_khz
);
1480 ndelay(min_t(u32
, delay_ns
, timer_advance_ns
));
1484 static inline void adjust_lapic_timer_advance(struct kvm_vcpu
*vcpu
,
1485 s64 advance_expire_delta
)
1487 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
1488 u32 timer_advance_ns
= apic
->lapic_timer
.timer_advance_ns
;
1491 /* Do not adjust for tiny fluctuations or large random spikes. */
1492 if (abs(advance_expire_delta
) > LAPIC_TIMER_ADVANCE_ADJUST_MAX
||
1493 abs(advance_expire_delta
) < LAPIC_TIMER_ADVANCE_ADJUST_MIN
)
1497 if (advance_expire_delta
< 0) {
1498 ns
= -advance_expire_delta
* 1000000ULL;
1499 do_div(ns
, vcpu
->arch
.virtual_tsc_khz
);
1500 timer_advance_ns
-= ns
/LAPIC_TIMER_ADVANCE_ADJUST_STEP
;
1503 ns
= advance_expire_delta
* 1000000ULL;
1504 do_div(ns
, vcpu
->arch
.virtual_tsc_khz
);
1505 timer_advance_ns
+= ns
/LAPIC_TIMER_ADVANCE_ADJUST_STEP
;
1508 if (unlikely(timer_advance_ns
> LAPIC_TIMER_ADVANCE_NS_MAX
))
1509 timer_advance_ns
= LAPIC_TIMER_ADVANCE_NS_INIT
;
1510 apic
->lapic_timer
.timer_advance_ns
= timer_advance_ns
;
1513 static void __kvm_wait_lapic_expire(struct kvm_vcpu
*vcpu
)
1515 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
1516 u64 guest_tsc
, tsc_deadline
;
1518 if (apic
->lapic_timer
.expired_tscdeadline
== 0)
1521 tsc_deadline
= apic
->lapic_timer
.expired_tscdeadline
;
1522 apic
->lapic_timer
.expired_tscdeadline
= 0;
1523 guest_tsc
= kvm_read_l1_tsc(vcpu
, rdtsc());
1524 apic
->lapic_timer
.advance_expire_delta
= guest_tsc
- tsc_deadline
;
1526 if (guest_tsc
< tsc_deadline
)
1527 __wait_lapic_expire(vcpu
, tsc_deadline
- guest_tsc
);
1529 if (lapic_timer_advance_dynamic
)
1530 adjust_lapic_timer_advance(vcpu
, apic
->lapic_timer
.advance_expire_delta
);
1533 void kvm_wait_lapic_expire(struct kvm_vcpu
*vcpu
)
1535 if (lapic_timer_int_injected(vcpu
))
1536 __kvm_wait_lapic_expire(vcpu
);
1538 EXPORT_SYMBOL_GPL(kvm_wait_lapic_expire
);
1540 static void kvm_apic_inject_pending_timer_irqs(struct kvm_lapic
*apic
)
1542 struct kvm_timer
*ktimer
= &apic
->lapic_timer
;
1544 kvm_apic_local_deliver(apic
, APIC_LVTT
);
1545 if (apic_lvtt_tscdeadline(apic
))
1546 ktimer
->tscdeadline
= 0;
1547 if (apic_lvtt_oneshot(apic
)) {
1548 ktimer
->tscdeadline
= 0;
1549 ktimer
->target_expiration
= 0;
1553 static void apic_timer_expired(struct kvm_lapic
*apic
)
1555 struct kvm_vcpu
*vcpu
= apic
->vcpu
;
1556 struct kvm_timer
*ktimer
= &apic
->lapic_timer
;
1558 if (atomic_read(&apic
->lapic_timer
.pending
))
1561 if (apic_lvtt_tscdeadline(apic
) || ktimer
->hv_timer_in_use
)
1562 ktimer
->expired_tscdeadline
= ktimer
->tscdeadline
;
1564 if (kvm_use_posted_timer_interrupt(apic
->vcpu
)) {
1565 if (apic
->lapic_timer
.timer_advance_ns
)
1566 __kvm_wait_lapic_expire(vcpu
);
1567 kvm_apic_inject_pending_timer_irqs(apic
);
1571 atomic_inc(&apic
->lapic_timer
.pending
);
1572 kvm_set_pending_timer(vcpu
);
1575 static void start_sw_tscdeadline(struct kvm_lapic
*apic
)
1577 struct kvm_timer
*ktimer
= &apic
->lapic_timer
;
1578 u64 guest_tsc
, tscdeadline
= ktimer
->tscdeadline
;
1581 struct kvm_vcpu
*vcpu
= apic
->vcpu
;
1582 unsigned long this_tsc_khz
= vcpu
->arch
.virtual_tsc_khz
;
1583 unsigned long flags
;
1586 if (unlikely(!tscdeadline
|| !this_tsc_khz
))
1589 local_irq_save(flags
);
1592 guest_tsc
= kvm_read_l1_tsc(vcpu
, rdtsc());
1594 ns
= (tscdeadline
- guest_tsc
) * 1000000ULL;
1595 do_div(ns
, this_tsc_khz
);
1597 if (likely(tscdeadline
> guest_tsc
) &&
1598 likely(ns
> apic
->lapic_timer
.timer_advance_ns
)) {
1599 expire
= ktime_add_ns(now
, ns
);
1600 expire
= ktime_sub_ns(expire
, ktimer
->timer_advance_ns
);
1601 hrtimer_start(&ktimer
->timer
, expire
, HRTIMER_MODE_ABS_HARD
);
1603 apic_timer_expired(apic
);
1605 local_irq_restore(flags
);
1608 static void update_target_expiration(struct kvm_lapic
*apic
, uint32_t old_divisor
)
1610 ktime_t now
, remaining
;
1611 u64 ns_remaining_old
, ns_remaining_new
;
1613 apic
->lapic_timer
.period
= (u64
)kvm_lapic_get_reg(apic
, APIC_TMICT
)
1614 * APIC_BUS_CYCLE_NS
* apic
->divide_count
;
1615 limit_periodic_timer_frequency(apic
);
1618 remaining
= ktime_sub(apic
->lapic_timer
.target_expiration
, now
);
1619 if (ktime_to_ns(remaining
) < 0)
1622 ns_remaining_old
= ktime_to_ns(remaining
);
1623 ns_remaining_new
= mul_u64_u32_div(ns_remaining_old
,
1624 apic
->divide_count
, old_divisor
);
1626 apic
->lapic_timer
.tscdeadline
+=
1627 nsec_to_cycles(apic
->vcpu
, ns_remaining_new
) -
1628 nsec_to_cycles(apic
->vcpu
, ns_remaining_old
);
1629 apic
->lapic_timer
.target_expiration
= ktime_add_ns(now
, ns_remaining_new
);
1632 static bool set_target_expiration(struct kvm_lapic
*apic
)
1638 apic
->lapic_timer
.period
= (u64
)kvm_lapic_get_reg(apic
, APIC_TMICT
)
1639 * APIC_BUS_CYCLE_NS
* apic
->divide_count
;
1641 if (!apic
->lapic_timer
.period
) {
1642 apic
->lapic_timer
.tscdeadline
= 0;
1646 limit_periodic_timer_frequency(apic
);
1648 apic
->lapic_timer
.tscdeadline
= kvm_read_l1_tsc(apic
->vcpu
, tscl
) +
1649 nsec_to_cycles(apic
->vcpu
, apic
->lapic_timer
.period
);
1650 apic
->lapic_timer
.target_expiration
= ktime_add_ns(now
, apic
->lapic_timer
.period
);
1655 static void advance_periodic_target_expiration(struct kvm_lapic
*apic
)
1657 ktime_t now
= ktime_get();
1662 * Synchronize both deadlines to the same time source or
1663 * differences in the periods (caused by differences in the
1664 * underlying clocks or numerical approximation errors) will
1665 * cause the two to drift apart over time as the errors
1668 apic
->lapic_timer
.target_expiration
=
1669 ktime_add_ns(apic
->lapic_timer
.target_expiration
,
1670 apic
->lapic_timer
.period
);
1671 delta
= ktime_sub(apic
->lapic_timer
.target_expiration
, now
);
1672 apic
->lapic_timer
.tscdeadline
= kvm_read_l1_tsc(apic
->vcpu
, tscl
) +
1673 nsec_to_cycles(apic
->vcpu
, delta
);
1676 static void start_sw_period(struct kvm_lapic
*apic
)
1678 if (!apic
->lapic_timer
.period
)
1681 if (ktime_after(ktime_get(),
1682 apic
->lapic_timer
.target_expiration
)) {
1683 apic_timer_expired(apic
);
1685 if (apic_lvtt_oneshot(apic
))
1688 advance_periodic_target_expiration(apic
);
1691 hrtimer_start(&apic
->lapic_timer
.timer
,
1692 apic
->lapic_timer
.target_expiration
,
1696 bool kvm_lapic_hv_timer_in_use(struct kvm_vcpu
*vcpu
)
1698 if (!lapic_in_kernel(vcpu
))
1701 return vcpu
->arch
.apic
->lapic_timer
.hv_timer_in_use
;
1703 EXPORT_SYMBOL_GPL(kvm_lapic_hv_timer_in_use
);
1705 static void cancel_hv_timer(struct kvm_lapic
*apic
)
1707 WARN_ON(preemptible());
1708 WARN_ON(!apic
->lapic_timer
.hv_timer_in_use
);
1709 kvm_x86_ops
->cancel_hv_timer(apic
->vcpu
);
1710 apic
->lapic_timer
.hv_timer_in_use
= false;
1713 static bool start_hv_timer(struct kvm_lapic
*apic
)
1715 struct kvm_timer
*ktimer
= &apic
->lapic_timer
;
1716 struct kvm_vcpu
*vcpu
= apic
->vcpu
;
1719 WARN_ON(preemptible());
1720 if (!kvm_x86_ops
->set_hv_timer
)
1723 if (!ktimer
->tscdeadline
)
1726 if (kvm_x86_ops
->set_hv_timer(vcpu
, ktimer
->tscdeadline
, &expired
))
1729 ktimer
->hv_timer_in_use
= true;
1730 hrtimer_cancel(&ktimer
->timer
);
1733 * To simplify handling the periodic timer, leave the hv timer running
1734 * even if the deadline timer has expired, i.e. rely on the resulting
1735 * VM-Exit to recompute the periodic timer's target expiration.
1737 if (!apic_lvtt_period(apic
)) {
1739 * Cancel the hv timer if the sw timer fired while the hv timer
1740 * was being programmed, or if the hv timer itself expired.
1742 if (atomic_read(&ktimer
->pending
)) {
1743 cancel_hv_timer(apic
);
1744 } else if (expired
) {
1745 apic_timer_expired(apic
);
1746 cancel_hv_timer(apic
);
1750 trace_kvm_hv_timer_state(vcpu
->vcpu_id
, ktimer
->hv_timer_in_use
);
1755 static void start_sw_timer(struct kvm_lapic
*apic
)
1757 struct kvm_timer
*ktimer
= &apic
->lapic_timer
;
1759 WARN_ON(preemptible());
1760 if (apic
->lapic_timer
.hv_timer_in_use
)
1761 cancel_hv_timer(apic
);
1762 if (!apic_lvtt_period(apic
) && atomic_read(&ktimer
->pending
))
1765 if (apic_lvtt_period(apic
) || apic_lvtt_oneshot(apic
))
1766 start_sw_period(apic
);
1767 else if (apic_lvtt_tscdeadline(apic
))
1768 start_sw_tscdeadline(apic
);
1769 trace_kvm_hv_timer_state(apic
->vcpu
->vcpu_id
, false);
1772 static void restart_apic_timer(struct kvm_lapic
*apic
)
1776 if (!apic_lvtt_period(apic
) && atomic_read(&apic
->lapic_timer
.pending
))
1779 if (!start_hv_timer(apic
))
1780 start_sw_timer(apic
);
1785 void kvm_lapic_expired_hv_timer(struct kvm_vcpu
*vcpu
)
1787 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
1790 /* If the preempt notifier has already run, it also called apic_timer_expired */
1791 if (!apic
->lapic_timer
.hv_timer_in_use
)
1793 WARN_ON(swait_active(&vcpu
->wq
));
1794 cancel_hv_timer(apic
);
1795 apic_timer_expired(apic
);
1797 if (apic_lvtt_period(apic
) && apic
->lapic_timer
.period
) {
1798 advance_periodic_target_expiration(apic
);
1799 restart_apic_timer(apic
);
1804 EXPORT_SYMBOL_GPL(kvm_lapic_expired_hv_timer
);
1806 void kvm_lapic_switch_to_hv_timer(struct kvm_vcpu
*vcpu
)
1808 restart_apic_timer(vcpu
->arch
.apic
);
1810 EXPORT_SYMBOL_GPL(kvm_lapic_switch_to_hv_timer
);
1812 void kvm_lapic_switch_to_sw_timer(struct kvm_vcpu
*vcpu
)
1814 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
1817 /* Possibly the TSC deadline timer is not enabled yet */
1818 if (apic
->lapic_timer
.hv_timer_in_use
)
1819 start_sw_timer(apic
);
1822 EXPORT_SYMBOL_GPL(kvm_lapic_switch_to_sw_timer
);
1824 void kvm_lapic_restart_hv_timer(struct kvm_vcpu
*vcpu
)
1826 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
1828 WARN_ON(!apic
->lapic_timer
.hv_timer_in_use
);
1829 restart_apic_timer(apic
);
1832 static void start_apic_timer(struct kvm_lapic
*apic
)
1834 atomic_set(&apic
->lapic_timer
.pending
, 0);
1836 if ((apic_lvtt_period(apic
) || apic_lvtt_oneshot(apic
))
1837 && !set_target_expiration(apic
))
1840 restart_apic_timer(apic
);
1843 static void apic_manage_nmi_watchdog(struct kvm_lapic
*apic
, u32 lvt0_val
)
1845 bool lvt0_in_nmi_mode
= apic_lvt_nmi_mode(lvt0_val
);
1847 if (apic
->lvt0_in_nmi_mode
!= lvt0_in_nmi_mode
) {
1848 apic
->lvt0_in_nmi_mode
= lvt0_in_nmi_mode
;
1849 if (lvt0_in_nmi_mode
) {
1850 atomic_inc(&apic
->vcpu
->kvm
->arch
.vapics_in_nmi_mode
);
1852 atomic_dec(&apic
->vcpu
->kvm
->arch
.vapics_in_nmi_mode
);
1856 int kvm_lapic_reg_write(struct kvm_lapic
*apic
, u32 reg
, u32 val
)
1860 trace_kvm_apic_write(reg
, val
);
1863 case APIC_ID
: /* Local APIC ID */
1864 if (!apic_x2apic_mode(apic
))
1865 kvm_apic_set_xapic_id(apic
, val
>> 24);
1871 report_tpr_access(apic
, true);
1872 apic_set_tpr(apic
, val
& 0xff);
1880 if (!apic_x2apic_mode(apic
))
1881 kvm_apic_set_ldr(apic
, val
& APIC_LDR_MASK
);
1887 if (!apic_x2apic_mode(apic
)) {
1888 kvm_lapic_set_reg(apic
, APIC_DFR
, val
| 0x0FFFFFFF);
1889 recalculate_apic_map(apic
->vcpu
->kvm
);
1896 if (kvm_lapic_get_reg(apic
, APIC_LVR
) & APIC_LVR_DIRECTED_EOI
)
1897 mask
|= APIC_SPIV_DIRECTED_EOI
;
1898 apic_set_spiv(apic
, val
& mask
);
1899 if (!(val
& APIC_SPIV_APIC_ENABLED
)) {
1903 for (i
= 0; i
< KVM_APIC_LVT_NUM
; i
++) {
1904 lvt_val
= kvm_lapic_get_reg(apic
,
1905 APIC_LVTT
+ 0x10 * i
);
1906 kvm_lapic_set_reg(apic
, APIC_LVTT
+ 0x10 * i
,
1907 lvt_val
| APIC_LVT_MASKED
);
1909 apic_update_lvtt(apic
);
1910 atomic_set(&apic
->lapic_timer
.pending
, 0);
1916 /* No delay here, so we always clear the pending bit */
1918 apic_send_ipi(apic
, val
, kvm_lapic_get_reg(apic
, APIC_ICR2
));
1919 kvm_lapic_set_reg(apic
, APIC_ICR
, val
);
1923 if (!apic_x2apic_mode(apic
))
1925 kvm_lapic_set_reg(apic
, APIC_ICR2
, val
);
1929 apic_manage_nmi_watchdog(apic
, val
);
1935 /* TODO: Check vector */
1936 if (!kvm_apic_sw_enabled(apic
))
1937 val
|= APIC_LVT_MASKED
;
1939 val
&= apic_lvt_mask
[(reg
- APIC_LVTT
) >> 4];
1940 kvm_lapic_set_reg(apic
, reg
, val
);
1945 if (!kvm_apic_sw_enabled(apic
))
1946 val
|= APIC_LVT_MASKED
;
1947 val
&= (apic_lvt_mask
[0] | apic
->lapic_timer
.timer_mode_mask
);
1948 kvm_lapic_set_reg(apic
, APIC_LVTT
, val
);
1949 apic_update_lvtt(apic
);
1953 if (apic_lvtt_tscdeadline(apic
))
1956 hrtimer_cancel(&apic
->lapic_timer
.timer
);
1957 kvm_lapic_set_reg(apic
, APIC_TMICT
, val
);
1958 start_apic_timer(apic
);
1962 uint32_t old_divisor
= apic
->divide_count
;
1964 kvm_lapic_set_reg(apic
, APIC_TDCR
, val
);
1965 update_divide_count(apic
);
1966 if (apic
->divide_count
!= old_divisor
&&
1967 apic
->lapic_timer
.period
) {
1968 hrtimer_cancel(&apic
->lapic_timer
.timer
);
1969 update_target_expiration(apic
, old_divisor
);
1970 restart_apic_timer(apic
);
1975 if (apic_x2apic_mode(apic
) && val
!= 0)
1980 if (apic_x2apic_mode(apic
)) {
1981 kvm_lapic_reg_write(apic
, APIC_ICR
, 0x40000 | (val
& 0xff));
1992 EXPORT_SYMBOL_GPL(kvm_lapic_reg_write
);
1994 static int apic_mmio_write(struct kvm_vcpu
*vcpu
, struct kvm_io_device
*this,
1995 gpa_t address
, int len
, const void *data
)
1997 struct kvm_lapic
*apic
= to_lapic(this);
1998 unsigned int offset
= address
- apic
->base_address
;
2001 if (!apic_mmio_in_range(apic
, address
))
2004 if (!kvm_apic_hw_enabled(apic
) || apic_x2apic_mode(apic
)) {
2005 if (!kvm_check_has_quirk(vcpu
->kvm
,
2006 KVM_X86_QUIRK_LAPIC_MMIO_HOLE
))
2013 * APIC register must be aligned on 128-bits boundary.
2014 * 32/64/128 bits registers must be accessed thru 32 bits.
2017 if (len
!= 4 || (offset
& 0xf))
2022 kvm_lapic_reg_write(apic
, offset
& 0xff0, val
);
2027 void kvm_lapic_set_eoi(struct kvm_vcpu
*vcpu
)
2029 kvm_lapic_reg_write(vcpu
->arch
.apic
, APIC_EOI
, 0);
2031 EXPORT_SYMBOL_GPL(kvm_lapic_set_eoi
);
2033 /* emulate APIC access in a trap manner */
2034 void kvm_apic_write_nodecode(struct kvm_vcpu
*vcpu
, u32 offset
)
2038 /* hw has done the conditional check and inst decode */
2041 kvm_lapic_reg_read(vcpu
->arch
.apic
, offset
, 4, &val
);
2043 /* TODO: optimize to just emulate side effect w/o one more write */
2044 kvm_lapic_reg_write(vcpu
->arch
.apic
, offset
, val
);
2046 EXPORT_SYMBOL_GPL(kvm_apic_write_nodecode
);
2048 void kvm_free_lapic(struct kvm_vcpu
*vcpu
)
2050 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
2052 if (!vcpu
->arch
.apic
)
2055 hrtimer_cancel(&apic
->lapic_timer
.timer
);
2057 if (!(vcpu
->arch
.apic_base
& MSR_IA32_APICBASE_ENABLE
))
2058 static_key_slow_dec_deferred(&apic_hw_disabled
);
2060 if (!apic
->sw_enabled
)
2061 static_key_slow_dec_deferred(&apic_sw_disabled
);
2064 free_page((unsigned long)apic
->regs
);
2070 *----------------------------------------------------------------------
2072 *----------------------------------------------------------------------
2074 u64
kvm_get_lapic_tscdeadline_msr(struct kvm_vcpu
*vcpu
)
2076 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
2078 if (!lapic_in_kernel(vcpu
) ||
2079 !apic_lvtt_tscdeadline(apic
))
2082 return apic
->lapic_timer
.tscdeadline
;
2085 void kvm_set_lapic_tscdeadline_msr(struct kvm_vcpu
*vcpu
, u64 data
)
2087 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
2089 if (!lapic_in_kernel(vcpu
) || apic_lvtt_oneshot(apic
) ||
2090 apic_lvtt_period(apic
))
2093 hrtimer_cancel(&apic
->lapic_timer
.timer
);
2094 apic
->lapic_timer
.tscdeadline
= data
;
2095 start_apic_timer(apic
);
2098 void kvm_lapic_set_tpr(struct kvm_vcpu
*vcpu
, unsigned long cr8
)
2100 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
2102 apic_set_tpr(apic
, ((cr8
& 0x0f) << 4)
2103 | (kvm_lapic_get_reg(apic
, APIC_TASKPRI
) & 4));
2106 u64
kvm_lapic_get_cr8(struct kvm_vcpu
*vcpu
)
2110 tpr
= (u64
) kvm_lapic_get_reg(vcpu
->arch
.apic
, APIC_TASKPRI
);
2112 return (tpr
& 0xf0) >> 4;
2115 void kvm_lapic_set_base(struct kvm_vcpu
*vcpu
, u64 value
)
2117 u64 old_value
= vcpu
->arch
.apic_base
;
2118 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
2121 value
|= MSR_IA32_APICBASE_BSP
;
2123 vcpu
->arch
.apic_base
= value
;
2125 if ((old_value
^ value
) & MSR_IA32_APICBASE_ENABLE
)
2126 kvm_update_cpuid(vcpu
);
2131 /* update jump label if enable bit changes */
2132 if ((old_value
^ value
) & MSR_IA32_APICBASE_ENABLE
) {
2133 if (value
& MSR_IA32_APICBASE_ENABLE
) {
2134 kvm_apic_set_xapic_id(apic
, vcpu
->vcpu_id
);
2135 static_key_slow_dec_deferred(&apic_hw_disabled
);
2137 static_key_slow_inc(&apic_hw_disabled
.key
);
2138 recalculate_apic_map(vcpu
->kvm
);
2142 if (((old_value
^ value
) & X2APIC_ENABLE
) && (value
& X2APIC_ENABLE
))
2143 kvm_apic_set_x2apic_id(apic
, vcpu
->vcpu_id
);
2145 if ((old_value
^ value
) & (MSR_IA32_APICBASE_ENABLE
| X2APIC_ENABLE
))
2146 kvm_x86_ops
->set_virtual_apic_mode(vcpu
);
2148 apic
->base_address
= apic
->vcpu
->arch
.apic_base
&
2149 MSR_IA32_APICBASE_BASE
;
2151 if ((value
& MSR_IA32_APICBASE_ENABLE
) &&
2152 apic
->base_address
!= APIC_DEFAULT_PHYS_BASE
)
2153 pr_warn_once("APIC base relocation is unsupported by KVM");
2156 void kvm_lapic_reset(struct kvm_vcpu
*vcpu
, bool init_event
)
2158 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
2164 /* Stop the timer in case it's a reset to an active apic */
2165 hrtimer_cancel(&apic
->lapic_timer
.timer
);
2168 kvm_lapic_set_base(vcpu
, APIC_DEFAULT_PHYS_BASE
|
2169 MSR_IA32_APICBASE_ENABLE
);
2170 kvm_apic_set_xapic_id(apic
, vcpu
->vcpu_id
);
2172 kvm_apic_set_version(apic
->vcpu
);
2174 for (i
= 0; i
< KVM_APIC_LVT_NUM
; i
++)
2175 kvm_lapic_set_reg(apic
, APIC_LVTT
+ 0x10 * i
, APIC_LVT_MASKED
);
2176 apic_update_lvtt(apic
);
2177 if (kvm_vcpu_is_reset_bsp(vcpu
) &&
2178 kvm_check_has_quirk(vcpu
->kvm
, KVM_X86_QUIRK_LINT0_REENABLED
))
2179 kvm_lapic_set_reg(apic
, APIC_LVT0
,
2180 SET_APIC_DELIVERY_MODE(0, APIC_MODE_EXTINT
));
2181 apic_manage_nmi_watchdog(apic
, kvm_lapic_get_reg(apic
, APIC_LVT0
));
2183 kvm_lapic_set_reg(apic
, APIC_DFR
, 0xffffffffU
);
2184 apic_set_spiv(apic
, 0xff);
2185 kvm_lapic_set_reg(apic
, APIC_TASKPRI
, 0);
2186 if (!apic_x2apic_mode(apic
))
2187 kvm_apic_set_ldr(apic
, 0);
2188 kvm_lapic_set_reg(apic
, APIC_ESR
, 0);
2189 kvm_lapic_set_reg(apic
, APIC_ICR
, 0);
2190 kvm_lapic_set_reg(apic
, APIC_ICR2
, 0);
2191 kvm_lapic_set_reg(apic
, APIC_TDCR
, 0);
2192 kvm_lapic_set_reg(apic
, APIC_TMICT
, 0);
2193 for (i
= 0; i
< 8; i
++) {
2194 kvm_lapic_set_reg(apic
, APIC_IRR
+ 0x10 * i
, 0);
2195 kvm_lapic_set_reg(apic
, APIC_ISR
+ 0x10 * i
, 0);
2196 kvm_lapic_set_reg(apic
, APIC_TMR
+ 0x10 * i
, 0);
2198 apic
->irr_pending
= vcpu
->arch
.apicv_active
;
2199 apic
->isr_count
= vcpu
->arch
.apicv_active
? 1 : 0;
2200 apic
->highest_isr_cache
= -1;
2201 update_divide_count(apic
);
2202 atomic_set(&apic
->lapic_timer
.pending
, 0);
2203 if (kvm_vcpu_is_bsp(vcpu
))
2204 kvm_lapic_set_base(vcpu
,
2205 vcpu
->arch
.apic_base
| MSR_IA32_APICBASE_BSP
);
2206 vcpu
->arch
.pv_eoi
.msr_val
= 0;
2207 apic_update_ppr(apic
);
2208 if (vcpu
->arch
.apicv_active
) {
2209 kvm_x86_ops
->apicv_post_state_restore(vcpu
);
2210 kvm_x86_ops
->hwapic_irr_update(vcpu
, -1);
2211 kvm_x86_ops
->hwapic_isr_update(vcpu
, -1);
2214 vcpu
->arch
.apic_arb_prio
= 0;
2215 vcpu
->arch
.apic_attention
= 0;
2219 *----------------------------------------------------------------------
2221 *----------------------------------------------------------------------
2224 static bool lapic_is_periodic(struct kvm_lapic
*apic
)
2226 return apic_lvtt_period(apic
);
2229 int apic_has_pending_timer(struct kvm_vcpu
*vcpu
)
2231 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
2233 if (apic_enabled(apic
) && apic_lvt_enabled(apic
, APIC_LVTT
))
2234 return atomic_read(&apic
->lapic_timer
.pending
);
2239 int kvm_apic_local_deliver(struct kvm_lapic
*apic
, int lvt_type
)
2241 u32 reg
= kvm_lapic_get_reg(apic
, lvt_type
);
2242 int vector
, mode
, trig_mode
;
2244 if (kvm_apic_hw_enabled(apic
) && !(reg
& APIC_LVT_MASKED
)) {
2245 vector
= reg
& APIC_VECTOR_MASK
;
2246 mode
= reg
& APIC_MODE_MASK
;
2247 trig_mode
= reg
& APIC_LVT_LEVEL_TRIGGER
;
2248 return __apic_accept_irq(apic
, mode
, vector
, 1, trig_mode
,
2254 void kvm_apic_nmi_wd_deliver(struct kvm_vcpu
*vcpu
)
2256 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
2259 kvm_apic_local_deliver(apic
, APIC_LVT0
);
2262 static const struct kvm_io_device_ops apic_mmio_ops
= {
2263 .read
= apic_mmio_read
,
2264 .write
= apic_mmio_write
,
2267 static enum hrtimer_restart
apic_timer_fn(struct hrtimer
*data
)
2269 struct kvm_timer
*ktimer
= container_of(data
, struct kvm_timer
, timer
);
2270 struct kvm_lapic
*apic
= container_of(ktimer
, struct kvm_lapic
, lapic_timer
);
2272 apic_timer_expired(apic
);
2274 if (lapic_is_periodic(apic
)) {
2275 advance_periodic_target_expiration(apic
);
2276 hrtimer_add_expires_ns(&ktimer
->timer
, ktimer
->period
);
2277 return HRTIMER_RESTART
;
2279 return HRTIMER_NORESTART
;
2282 int kvm_create_lapic(struct kvm_vcpu
*vcpu
, int timer_advance_ns
)
2284 struct kvm_lapic
*apic
;
2286 ASSERT(vcpu
!= NULL
);
2288 apic
= kzalloc(sizeof(*apic
), GFP_KERNEL_ACCOUNT
);
2292 vcpu
->arch
.apic
= apic
;
2294 apic
->regs
= (void *)get_zeroed_page(GFP_KERNEL_ACCOUNT
);
2296 printk(KERN_ERR
"malloc apic regs error for vcpu %x\n",
2298 goto nomem_free_apic
;
2302 hrtimer_init(&apic
->lapic_timer
.timer
, CLOCK_MONOTONIC
,
2303 HRTIMER_MODE_ABS_HARD
);
2304 apic
->lapic_timer
.timer
.function
= apic_timer_fn
;
2305 if (timer_advance_ns
== -1) {
2306 apic
->lapic_timer
.timer_advance_ns
= LAPIC_TIMER_ADVANCE_NS_INIT
;
2307 lapic_timer_advance_dynamic
= true;
2309 apic
->lapic_timer
.timer_advance_ns
= timer_advance_ns
;
2310 lapic_timer_advance_dynamic
= false;
2314 * APIC is created enabled. This will prevent kvm_lapic_set_base from
2315 * thinking that APIC state has changed.
2317 vcpu
->arch
.apic_base
= MSR_IA32_APICBASE_ENABLE
;
2318 static_key_slow_inc(&apic_sw_disabled
.key
); /* sw disabled at reset */
2319 kvm_iodevice_init(&apic
->dev
, &apic_mmio_ops
);
2324 vcpu
->arch
.apic
= NULL
;
2329 int kvm_apic_has_interrupt(struct kvm_vcpu
*vcpu
)
2331 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
2334 if (!kvm_apic_hw_enabled(apic
))
2337 __apic_update_ppr(apic
, &ppr
);
2338 return apic_has_interrupt_for_ppr(apic
, ppr
);
2341 int kvm_apic_accept_pic_intr(struct kvm_vcpu
*vcpu
)
2343 u32 lvt0
= kvm_lapic_get_reg(vcpu
->arch
.apic
, APIC_LVT0
);
2346 if (!kvm_apic_hw_enabled(vcpu
->arch
.apic
))
2348 if ((lvt0
& APIC_LVT_MASKED
) == 0 &&
2349 GET_APIC_DELIVERY_MODE(lvt0
) == APIC_MODE_EXTINT
)
2354 void kvm_inject_apic_timer_irqs(struct kvm_vcpu
*vcpu
)
2356 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
2358 if (atomic_read(&apic
->lapic_timer
.pending
) > 0) {
2359 kvm_apic_inject_pending_timer_irqs(apic
);
2360 atomic_set(&apic
->lapic_timer
.pending
, 0);
2364 int kvm_get_apic_interrupt(struct kvm_vcpu
*vcpu
)
2366 int vector
= kvm_apic_has_interrupt(vcpu
);
2367 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
2374 * We get here even with APIC virtualization enabled, if doing
2375 * nested virtualization and L1 runs with the "acknowledge interrupt
2376 * on exit" mode. Then we cannot inject the interrupt via RVI,
2377 * because the process would deliver it through the IDT.
2380 apic_clear_irr(vector
, apic
);
2381 if (test_bit(vector
, vcpu_to_synic(vcpu
)->auto_eoi_bitmap
)) {
2383 * For auto-EOI interrupts, there might be another pending
2384 * interrupt above PPR, so check whether to raise another
2387 apic_update_ppr(apic
);
2390 * For normal interrupts, PPR has been raised and there cannot
2391 * be a higher-priority pending interrupt---except if there was
2392 * a concurrent interrupt injection, but that would have
2393 * triggered KVM_REQ_EVENT already.
2395 apic_set_isr(vector
, apic
);
2396 __apic_update_ppr(apic
, &ppr
);
2402 static int kvm_apic_state_fixup(struct kvm_vcpu
*vcpu
,
2403 struct kvm_lapic_state
*s
, bool set
)
2405 if (apic_x2apic_mode(vcpu
->arch
.apic
)) {
2406 u32
*id
= (u32
*)(s
->regs
+ APIC_ID
);
2407 u32
*ldr
= (u32
*)(s
->regs
+ APIC_LDR
);
2409 if (vcpu
->kvm
->arch
.x2apic_format
) {
2410 if (*id
!= vcpu
->vcpu_id
)
2419 /* In x2APIC mode, the LDR is fixed and based on the id */
2421 *ldr
= kvm_apic_calc_x2apic_ldr(*id
);
2427 int kvm_apic_get_state(struct kvm_vcpu
*vcpu
, struct kvm_lapic_state
*s
)
2429 memcpy(s
->regs
, vcpu
->arch
.apic
->regs
, sizeof(*s
));
2430 return kvm_apic_state_fixup(vcpu
, s
, false);
2433 int kvm_apic_set_state(struct kvm_vcpu
*vcpu
, struct kvm_lapic_state
*s
)
2435 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
2439 kvm_lapic_set_base(vcpu
, vcpu
->arch
.apic_base
);
2440 /* set SPIV separately to get count of SW disabled APICs right */
2441 apic_set_spiv(apic
, *((u32
*)(s
->regs
+ APIC_SPIV
)));
2443 r
= kvm_apic_state_fixup(vcpu
, s
, true);
2446 memcpy(vcpu
->arch
.apic
->regs
, s
->regs
, sizeof(*s
));
2448 recalculate_apic_map(vcpu
->kvm
);
2449 kvm_apic_set_version(vcpu
);
2451 apic_update_ppr(apic
);
2452 hrtimer_cancel(&apic
->lapic_timer
.timer
);
2453 apic_update_lvtt(apic
);
2454 apic_manage_nmi_watchdog(apic
, kvm_lapic_get_reg(apic
, APIC_LVT0
));
2455 update_divide_count(apic
);
2456 start_apic_timer(apic
);
2457 apic
->irr_pending
= true;
2458 apic
->isr_count
= vcpu
->arch
.apicv_active
?
2459 1 : count_vectors(apic
->regs
+ APIC_ISR
);
2460 apic
->highest_isr_cache
= -1;
2461 if (vcpu
->arch
.apicv_active
) {
2462 kvm_x86_ops
->apicv_post_state_restore(vcpu
);
2463 kvm_x86_ops
->hwapic_irr_update(vcpu
,
2464 apic_find_highest_irr(apic
));
2465 kvm_x86_ops
->hwapic_isr_update(vcpu
,
2466 apic_find_highest_isr(apic
));
2468 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
2469 if (ioapic_in_kernel(vcpu
->kvm
))
2470 kvm_rtc_eoi_tracking_restore_one(vcpu
);
2472 vcpu
->arch
.apic_arb_prio
= 0;
2477 void __kvm_migrate_apic_timer(struct kvm_vcpu
*vcpu
)
2479 struct hrtimer
*timer
;
2481 if (!lapic_in_kernel(vcpu
) ||
2482 kvm_can_post_timer_interrupt(vcpu
))
2485 timer
= &vcpu
->arch
.apic
->lapic_timer
.timer
;
2486 if (hrtimer_cancel(timer
))
2487 hrtimer_start_expires(timer
, HRTIMER_MODE_ABS_HARD
);
2491 * apic_sync_pv_eoi_from_guest - called on vmexit or cancel interrupt
2493 * Detect whether guest triggered PV EOI since the
2494 * last entry. If yes, set EOI on guests's behalf.
2495 * Clear PV EOI in guest memory in any case.
2497 static void apic_sync_pv_eoi_from_guest(struct kvm_vcpu
*vcpu
,
2498 struct kvm_lapic
*apic
)
2503 * PV EOI state is derived from KVM_APIC_PV_EOI_PENDING in host
2504 * and KVM_PV_EOI_ENABLED in guest memory as follows:
2506 * KVM_APIC_PV_EOI_PENDING is unset:
2507 * -> host disabled PV EOI.
2508 * KVM_APIC_PV_EOI_PENDING is set, KVM_PV_EOI_ENABLED is set:
2509 * -> host enabled PV EOI, guest did not execute EOI yet.
2510 * KVM_APIC_PV_EOI_PENDING is set, KVM_PV_EOI_ENABLED is unset:
2511 * -> host enabled PV EOI, guest executed EOI.
2513 BUG_ON(!pv_eoi_enabled(vcpu
));
2514 pending
= pv_eoi_get_pending(vcpu
);
2516 * Clear pending bit in any case: it will be set again on vmentry.
2517 * While this might not be ideal from performance point of view,
2518 * this makes sure pv eoi is only enabled when we know it's safe.
2520 pv_eoi_clr_pending(vcpu
);
2523 vector
= apic_set_eoi(apic
);
2524 trace_kvm_pv_eoi(apic
, vector
);
2527 void kvm_lapic_sync_from_vapic(struct kvm_vcpu
*vcpu
)
2531 if (test_bit(KVM_APIC_PV_EOI_PENDING
, &vcpu
->arch
.apic_attention
))
2532 apic_sync_pv_eoi_from_guest(vcpu
, vcpu
->arch
.apic
);
2534 if (!test_bit(KVM_APIC_CHECK_VAPIC
, &vcpu
->arch
.apic_attention
))
2537 if (kvm_read_guest_cached(vcpu
->kvm
, &vcpu
->arch
.apic
->vapic_cache
, &data
,
2541 apic_set_tpr(vcpu
->arch
.apic
, data
& 0xff);
2545 * apic_sync_pv_eoi_to_guest - called before vmentry
2547 * Detect whether it's safe to enable PV EOI and
2550 static void apic_sync_pv_eoi_to_guest(struct kvm_vcpu
*vcpu
,
2551 struct kvm_lapic
*apic
)
2553 if (!pv_eoi_enabled(vcpu
) ||
2554 /* IRR set or many bits in ISR: could be nested. */
2555 apic
->irr_pending
||
2556 /* Cache not set: could be safe but we don't bother. */
2557 apic
->highest_isr_cache
== -1 ||
2558 /* Need EOI to update ioapic. */
2559 kvm_ioapic_handles_vector(apic
, apic
->highest_isr_cache
)) {
2561 * PV EOI was disabled by apic_sync_pv_eoi_from_guest
2562 * so we need not do anything here.
2567 pv_eoi_set_pending(apic
->vcpu
);
2570 void kvm_lapic_sync_to_vapic(struct kvm_vcpu
*vcpu
)
2573 int max_irr
, max_isr
;
2574 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
2576 apic_sync_pv_eoi_to_guest(vcpu
, apic
);
2578 if (!test_bit(KVM_APIC_CHECK_VAPIC
, &vcpu
->arch
.apic_attention
))
2581 tpr
= kvm_lapic_get_reg(apic
, APIC_TASKPRI
) & 0xff;
2582 max_irr
= apic_find_highest_irr(apic
);
2585 max_isr
= apic_find_highest_isr(apic
);
2588 data
= (tpr
& 0xff) | ((max_isr
& 0xf0) << 8) | (max_irr
<< 24);
2590 kvm_write_guest_cached(vcpu
->kvm
, &vcpu
->arch
.apic
->vapic_cache
, &data
,
2594 int kvm_lapic_set_vapic_addr(struct kvm_vcpu
*vcpu
, gpa_t vapic_addr
)
2597 if (kvm_gfn_to_hva_cache_init(vcpu
->kvm
,
2598 &vcpu
->arch
.apic
->vapic_cache
,
2599 vapic_addr
, sizeof(u32
)))
2601 __set_bit(KVM_APIC_CHECK_VAPIC
, &vcpu
->arch
.apic_attention
);
2603 __clear_bit(KVM_APIC_CHECK_VAPIC
, &vcpu
->arch
.apic_attention
);
2606 vcpu
->arch
.apic
->vapic_addr
= vapic_addr
;
2610 int kvm_x2apic_msr_write(struct kvm_vcpu
*vcpu
, u32 msr
, u64 data
)
2612 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
2613 u32 reg
= (msr
- APIC_BASE_MSR
) << 4;
2615 if (!lapic_in_kernel(vcpu
) || !apic_x2apic_mode(apic
))
2618 if (reg
== APIC_ICR2
)
2621 /* if this is ICR write vector before command */
2622 if (reg
== APIC_ICR
)
2623 kvm_lapic_reg_write(apic
, APIC_ICR2
, (u32
)(data
>> 32));
2624 return kvm_lapic_reg_write(apic
, reg
, (u32
)data
);
2627 int kvm_x2apic_msr_read(struct kvm_vcpu
*vcpu
, u32 msr
, u64
*data
)
2629 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
2630 u32 reg
= (msr
- APIC_BASE_MSR
) << 4, low
, high
= 0;
2632 if (!lapic_in_kernel(vcpu
) || !apic_x2apic_mode(apic
))
2635 if (reg
== APIC_DFR
|| reg
== APIC_ICR2
)
2638 if (kvm_lapic_reg_read(apic
, reg
, 4, &low
))
2640 if (reg
== APIC_ICR
)
2641 kvm_lapic_reg_read(apic
, APIC_ICR2
, 4, &high
);
2643 *data
= (((u64
)high
) << 32) | low
;
2648 int kvm_hv_vapic_msr_write(struct kvm_vcpu
*vcpu
, u32 reg
, u64 data
)
2650 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
2652 if (!lapic_in_kernel(vcpu
))
2655 /* if this is ICR write vector before command */
2656 if (reg
== APIC_ICR
)
2657 kvm_lapic_reg_write(apic
, APIC_ICR2
, (u32
)(data
>> 32));
2658 return kvm_lapic_reg_write(apic
, reg
, (u32
)data
);
2661 int kvm_hv_vapic_msr_read(struct kvm_vcpu
*vcpu
, u32 reg
, u64
*data
)
2663 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
2666 if (!lapic_in_kernel(vcpu
))
2669 if (kvm_lapic_reg_read(apic
, reg
, 4, &low
))
2671 if (reg
== APIC_ICR
)
2672 kvm_lapic_reg_read(apic
, APIC_ICR2
, 4, &high
);
2674 *data
= (((u64
)high
) << 32) | low
;
2679 int kvm_lapic_enable_pv_eoi(struct kvm_vcpu
*vcpu
, u64 data
, unsigned long len
)
2681 u64 addr
= data
& ~KVM_MSR_ENABLED
;
2682 struct gfn_to_hva_cache
*ghc
= &vcpu
->arch
.pv_eoi
.data
;
2683 unsigned long new_len
;
2685 if (!IS_ALIGNED(addr
, 4))
2688 vcpu
->arch
.pv_eoi
.msr_val
= data
;
2689 if (!pv_eoi_enabled(vcpu
))
2692 if (addr
== ghc
->gpa
&& len
<= ghc
->len
)
2697 return kvm_gfn_to_hva_cache_init(vcpu
->kvm
, ghc
, addr
, new_len
);
2700 void kvm_apic_accept_events(struct kvm_vcpu
*vcpu
)
2702 struct kvm_lapic
*apic
= vcpu
->arch
.apic
;
2706 if (!lapic_in_kernel(vcpu
) || !apic
->pending_events
)
2710 * INITs are latched while CPU is in specific states
2711 * (SMM, VMX non-root mode, SVM with GIF=0).
2712 * Because a CPU cannot be in these states immediately
2713 * after it has processed an INIT signal (and thus in
2714 * KVM_MP_STATE_INIT_RECEIVED state), just eat SIPIs
2715 * and leave the INIT pending.
2717 if (kvm_vcpu_latch_init(vcpu
)) {
2718 WARN_ON_ONCE(vcpu
->arch
.mp_state
== KVM_MP_STATE_INIT_RECEIVED
);
2719 if (test_bit(KVM_APIC_SIPI
, &apic
->pending_events
))
2720 clear_bit(KVM_APIC_SIPI
, &apic
->pending_events
);
2724 pe
= xchg(&apic
->pending_events
, 0);
2725 if (test_bit(KVM_APIC_INIT
, &pe
)) {
2726 kvm_vcpu_reset(vcpu
, true);
2727 if (kvm_vcpu_is_bsp(apic
->vcpu
))
2728 vcpu
->arch
.mp_state
= KVM_MP_STATE_RUNNABLE
;
2730 vcpu
->arch
.mp_state
= KVM_MP_STATE_INIT_RECEIVED
;
2732 if (test_bit(KVM_APIC_SIPI
, &pe
) &&
2733 vcpu
->arch
.mp_state
== KVM_MP_STATE_INIT_RECEIVED
) {
2734 /* evaluate pending_events before reading the vector */
2736 sipi_vector
= apic
->sipi_vector
;
2737 kvm_vcpu_deliver_sipi_vector(vcpu
, sipi_vector
);
2738 vcpu
->arch
.mp_state
= KVM_MP_STATE_RUNNABLE
;
2742 void kvm_lapic_init(void)
2744 /* do not patch jump label more than once per second */
2745 jump_label_rate_limit(&apic_hw_disabled
, HZ
);
2746 jump_label_rate_limit(&apic_sw_disabled
, HZ
);
2749 void kvm_lapic_exit(void)
2751 static_key_deferred_flush(&apic_hw_disabled
);
2752 static_key_deferred_flush(&apic_sw_disabled
);