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"
46 #define mod_64(x, y) ((x) - (y) * div64_u64(x, y))
48 #define mod_64(x, y) ((x) % (y))
56 #define APIC_BUS_CYCLE_NS 1
58 /* #define apic_debug(fmt,arg...) printk(KERN_WARNING fmt,##arg) */
59 #define apic_debug(fmt, arg...)
61 #define APIC_LVT_NUM 6
62 /* 14 is the version for Xeon and Pentium 8.4.8*/
63 #define APIC_VERSION (0x14UL | ((APIC_LVT_NUM - 1) << 16))
64 #define LAPIC_MMIO_LENGTH (1 << 12)
65 /* followed define is not in apicdef.h */
66 #define APIC_SHORT_MASK 0xc0000
67 #define APIC_DEST_NOSHORT 0x0
68 #define APIC_DEST_MASK 0x800
69 #define MAX_APIC_VECTOR 256
70 #define APIC_VECTORS_PER_REG 32
72 #define APIC_BROADCAST 0xFF
73 #define X2APIC_BROADCAST 0xFFFFFFFFul
75 #define VEC_POS(v) ((v) & (32 - 1))
76 #define REG_POS(v) (((v) >> 5) << 4)
78 static inline void apic_set_reg(struct kvm_lapic *apic, int reg_off, u32 val)
80 *((u32 *) (apic->regs + reg_off)) = val;
83 static inline int apic_test_vector(int vec, void *bitmap)
85 return test_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
88 bool kvm_apic_pending_eoi(struct kvm_vcpu *vcpu, int vector)
90 struct kvm_lapic *apic = vcpu->arch.apic;
92 return apic_test_vector(vector, apic->regs + APIC_ISR) ||
93 apic_test_vector(vector, apic->regs + APIC_IRR);
96 static inline void apic_set_vector(int vec, void *bitmap)
98 set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
101 static inline void apic_clear_vector(int vec, void *bitmap)
103 clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
106 static inline int __apic_test_and_set_vector(int vec, void *bitmap)
108 return __test_and_set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
111 static inline int __apic_test_and_clear_vector(int vec, void *bitmap)
113 return __test_and_clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
116 struct static_key_deferred apic_hw_disabled __read_mostly;
117 struct static_key_deferred apic_sw_disabled __read_mostly;
119 static inline int apic_enabled(struct kvm_lapic *apic)
121 return kvm_apic_sw_enabled(apic) && kvm_apic_hw_enabled(apic);
125 (APIC_LVT_MASKED | APIC_SEND_PENDING | APIC_VECTOR_MASK)
128 (LVT_MASK | APIC_MODE_MASK | APIC_INPUT_POLARITY | \
129 APIC_LVT_REMOTE_IRR | APIC_LVT_LEVEL_TRIGGER)
131 static inline int kvm_apic_id(struct kvm_lapic *apic)
133 return (kvm_apic_get_reg(apic, APIC_ID) >> 24) & 0xff;
136 static void recalculate_apic_map(struct kvm *kvm)
138 struct kvm_apic_map *new, *old = NULL;
139 struct kvm_vcpu *vcpu;
142 new = kzalloc(sizeof(struct kvm_apic_map), GFP_KERNEL);
144 mutex_lock(&kvm->arch.apic_map_lock);
150 /* flat mode is default */
153 new->lid_mask = 0xff;
154 new->broadcast = APIC_BROADCAST;
156 kvm_for_each_vcpu(i, vcpu, kvm) {
157 struct kvm_lapic *apic = vcpu->arch.apic;
159 if (!kvm_apic_present(vcpu))
162 if (apic_x2apic_mode(apic)) {
165 new->cid_mask = new->lid_mask = 0xffff;
166 new->broadcast = X2APIC_BROADCAST;
167 } else if (kvm_apic_get_reg(apic, APIC_LDR)) {
168 if (kvm_apic_get_reg(apic, APIC_DFR) ==
176 new->lid_mask = 0xff;
181 * All APICs have to be configured in the same mode by an OS.
182 * We take advatage of this while building logical id loockup
183 * table. After reset APICs are in software disabled mode, so if
184 * we find apic with different setting we assume this is the mode
185 * OS wants all apics to be in; build lookup table accordingly.
187 if (kvm_apic_sw_enabled(apic))
191 kvm_for_each_vcpu(i, vcpu, kvm) {
192 struct kvm_lapic *apic = vcpu->arch.apic;
196 if (!kvm_apic_present(vcpu))
199 aid = kvm_apic_id(apic);
200 ldr = kvm_apic_get_reg(apic, APIC_LDR);
201 cid = apic_cluster_id(new, ldr);
202 lid = apic_logical_id(new, ldr);
204 if (aid < ARRAY_SIZE(new->phys_map))
205 new->phys_map[aid] = apic;
206 if (lid && cid < ARRAY_SIZE(new->logical_map))
207 new->logical_map[cid][ffs(lid) - 1] = apic;
210 old = rcu_dereference_protected(kvm->arch.apic_map,
211 lockdep_is_held(&kvm->arch.apic_map_lock));
212 rcu_assign_pointer(kvm->arch.apic_map, new);
213 mutex_unlock(&kvm->arch.apic_map_lock);
218 kvm_vcpu_request_scan_ioapic(kvm);
221 static inline void apic_set_spiv(struct kvm_lapic *apic, u32 val)
223 bool enabled = val & APIC_SPIV_APIC_ENABLED;
225 apic_set_reg(apic, APIC_SPIV, val);
227 if (enabled != apic->sw_enabled) {
228 apic->sw_enabled = enabled;
230 static_key_slow_dec_deferred(&apic_sw_disabled);
231 recalculate_apic_map(apic->vcpu->kvm);
233 static_key_slow_inc(&apic_sw_disabled.key);
237 static inline void kvm_apic_set_id(struct kvm_lapic *apic, u8 id)
239 apic_set_reg(apic, APIC_ID, id << 24);
240 recalculate_apic_map(apic->vcpu->kvm);
243 static inline void kvm_apic_set_ldr(struct kvm_lapic *apic, u32 id)
245 apic_set_reg(apic, APIC_LDR, id);
246 recalculate_apic_map(apic->vcpu->kvm);
249 static inline int apic_lvt_enabled(struct kvm_lapic *apic, int lvt_type)
251 return !(kvm_apic_get_reg(apic, lvt_type) & APIC_LVT_MASKED);
254 static inline int apic_lvt_vector(struct kvm_lapic *apic, int lvt_type)
256 return kvm_apic_get_reg(apic, lvt_type) & APIC_VECTOR_MASK;
259 static inline int apic_lvtt_oneshot(struct kvm_lapic *apic)
261 return apic->lapic_timer.timer_mode == APIC_LVT_TIMER_ONESHOT;
264 static inline int apic_lvtt_period(struct kvm_lapic *apic)
266 return apic->lapic_timer.timer_mode == APIC_LVT_TIMER_PERIODIC;
269 static inline int apic_lvtt_tscdeadline(struct kvm_lapic *apic)
271 return apic->lapic_timer.timer_mode == APIC_LVT_TIMER_TSCDEADLINE;
274 static inline int apic_lvt_nmi_mode(u32 lvt_val)
276 return (lvt_val & (APIC_MODE_MASK | APIC_LVT_MASKED)) == APIC_DM_NMI;
279 void kvm_apic_set_version(struct kvm_vcpu *vcpu)
281 struct kvm_lapic *apic = vcpu->arch.apic;
282 struct kvm_cpuid_entry2 *feat;
283 u32 v = APIC_VERSION;
285 if (!kvm_vcpu_has_lapic(vcpu))
288 feat = kvm_find_cpuid_entry(apic->vcpu, 0x1, 0);
289 if (feat && (feat->ecx & (1 << (X86_FEATURE_X2APIC & 31))))
290 v |= APIC_LVR_DIRECTED_EOI;
291 apic_set_reg(apic, APIC_LVR, v);
294 static const unsigned int apic_lvt_mask[APIC_LVT_NUM] = {
295 LVT_MASK , /* part LVTT mask, timer mode mask added at runtime */
296 LVT_MASK | APIC_MODE_MASK, /* LVTTHMR */
297 LVT_MASK | APIC_MODE_MASK, /* LVTPC */
298 LINT_MASK, LINT_MASK, /* LVT0-1 */
299 LVT_MASK /* LVTERR */
302 static int find_highest_vector(void *bitmap)
307 for (vec = MAX_APIC_VECTOR - APIC_VECTORS_PER_REG;
308 vec >= 0; vec -= APIC_VECTORS_PER_REG) {
309 reg = bitmap + REG_POS(vec);
311 return fls(*reg) - 1 + vec;
317 static u8 count_vectors(void *bitmap)
323 for (vec = 0; vec < MAX_APIC_VECTOR; vec += APIC_VECTORS_PER_REG) {
324 reg = bitmap + REG_POS(vec);
325 count += hweight32(*reg);
331 void __kvm_apic_update_irr(u32 *pir, void *regs)
335 for (i = 0; i <= 7; i++) {
336 pir_val = xchg(&pir[i], 0);
338 *((u32 *)(regs + APIC_IRR + i * 0x10)) |= pir_val;
341 EXPORT_SYMBOL_GPL(__kvm_apic_update_irr);
343 void kvm_apic_update_irr(struct kvm_vcpu *vcpu, u32 *pir)
345 struct kvm_lapic *apic = vcpu->arch.apic;
347 __kvm_apic_update_irr(pir, apic->regs);
349 EXPORT_SYMBOL_GPL(kvm_apic_update_irr);
351 static inline void apic_set_irr(int vec, struct kvm_lapic *apic)
353 apic_set_vector(vec, apic->regs + APIC_IRR);
355 * irr_pending must be true if any interrupt is pending; set it after
356 * APIC_IRR to avoid race with apic_clear_irr
358 apic->irr_pending = true;
361 static inline int apic_search_irr(struct kvm_lapic *apic)
363 return find_highest_vector(apic->regs + APIC_IRR);
366 static inline int apic_find_highest_irr(struct kvm_lapic *apic)
371 * Note that irr_pending is just a hint. It will be always
372 * true with virtual interrupt delivery enabled.
374 if (!apic->irr_pending)
377 kvm_x86_ops->sync_pir_to_irr(apic->vcpu);
378 result = apic_search_irr(apic);
379 ASSERT(result == -1 || result >= 16);
384 static inline void apic_clear_irr(int vec, struct kvm_lapic *apic)
386 struct kvm_vcpu *vcpu;
390 if (unlikely(kvm_apic_vid_enabled(vcpu->kvm))) {
391 /* try to update RVI */
392 apic_clear_vector(vec, apic->regs + APIC_IRR);
393 kvm_make_request(KVM_REQ_EVENT, vcpu);
395 apic->irr_pending = false;
396 apic_clear_vector(vec, apic->regs + APIC_IRR);
397 if (apic_search_irr(apic) != -1)
398 apic->irr_pending = true;
402 static inline void apic_set_isr(int vec, struct kvm_lapic *apic)
404 struct kvm_vcpu *vcpu;
406 if (__apic_test_and_set_vector(vec, apic->regs + APIC_ISR))
412 * With APIC virtualization enabled, all caching is disabled
413 * because the processor can modify ISR under the hood. Instead
416 if (unlikely(kvm_x86_ops->hwapic_isr_update))
417 kvm_x86_ops->hwapic_isr_update(vcpu->kvm, vec);
420 BUG_ON(apic->isr_count > MAX_APIC_VECTOR);
422 * ISR (in service register) bit is set when injecting an interrupt.
423 * The highest vector is injected. Thus the latest bit set matches
424 * the highest bit in ISR.
426 apic->highest_isr_cache = vec;
430 static inline int apic_find_highest_isr(struct kvm_lapic *apic)
435 * Note that isr_count is always 1, and highest_isr_cache
436 * is always -1, with APIC virtualization enabled.
438 if (!apic->isr_count)
440 if (likely(apic->highest_isr_cache != -1))
441 return apic->highest_isr_cache;
443 result = find_highest_vector(apic->regs + APIC_ISR);
444 ASSERT(result == -1 || result >= 16);
449 static inline void apic_clear_isr(int vec, struct kvm_lapic *apic)
451 struct kvm_vcpu *vcpu;
452 if (!__apic_test_and_clear_vector(vec, apic->regs + APIC_ISR))
458 * We do get here for APIC virtualization enabled if the guest
459 * uses the Hyper-V APIC enlightenment. In this case we may need
460 * to trigger a new interrupt delivery by writing the SVI field;
461 * on the other hand isr_count and highest_isr_cache are unused
462 * and must be left alone.
464 if (unlikely(kvm_x86_ops->hwapic_isr_update))
465 kvm_x86_ops->hwapic_isr_update(vcpu->kvm,
466 apic_find_highest_isr(apic));
469 BUG_ON(apic->isr_count < 0);
470 apic->highest_isr_cache = -1;
474 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 if (!kvm_vcpu_has_lapic(vcpu))
485 highest_irr = apic_find_highest_irr(vcpu->arch.apic);
490 static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
491 int vector, int level, int trig_mode,
492 unsigned long *dest_map);
494 int kvm_apic_set_irq(struct kvm_vcpu *vcpu, struct kvm_lapic_irq *irq,
495 unsigned long *dest_map)
497 struct kvm_lapic *apic = vcpu->arch.apic;
499 return __apic_accept_irq(apic, irq->delivery_mode, irq->vector,
500 irq->level, irq->trig_mode, dest_map);
503 static int pv_eoi_put_user(struct kvm_vcpu *vcpu, u8 val)
506 return kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.pv_eoi.data, &val,
510 static int pv_eoi_get_user(struct kvm_vcpu *vcpu, u8 *val)
513 return kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.pv_eoi.data, val,
517 static inline bool pv_eoi_enabled(struct kvm_vcpu *vcpu)
519 return vcpu->arch.pv_eoi.msr_val & KVM_MSR_ENABLED;
522 static bool pv_eoi_get_pending(struct kvm_vcpu *vcpu)
525 if (pv_eoi_get_user(vcpu, &val) < 0)
526 apic_debug("Can't read EOI MSR value: 0x%llx\n",
527 (unsigned long long)vcpu->arch.pv_eoi.msr_val);
531 static void pv_eoi_set_pending(struct kvm_vcpu *vcpu)
533 if (pv_eoi_put_user(vcpu, KVM_PV_EOI_ENABLED) < 0) {
534 apic_debug("Can't set EOI MSR value: 0x%llx\n",
535 (unsigned long long)vcpu->arch.pv_eoi.msr_val);
538 __set_bit(KVM_APIC_PV_EOI_PENDING, &vcpu->arch.apic_attention);
541 static void pv_eoi_clr_pending(struct kvm_vcpu *vcpu)
543 if (pv_eoi_put_user(vcpu, KVM_PV_EOI_DISABLED) < 0) {
544 apic_debug("Can't clear EOI MSR value: 0x%llx\n",
545 (unsigned long long)vcpu->arch.pv_eoi.msr_val);
548 __clear_bit(KVM_APIC_PV_EOI_PENDING, &vcpu->arch.apic_attention);
551 void kvm_apic_update_tmr(struct kvm_vcpu *vcpu, u32 *tmr)
553 struct kvm_lapic *apic = vcpu->arch.apic;
556 for (i = 0; i < 8; i++)
557 apic_set_reg(apic, APIC_TMR + 0x10 * i, tmr[i]);
560 static void apic_update_ppr(struct kvm_lapic *apic)
562 u32 tpr, isrv, ppr, old_ppr;
565 old_ppr = kvm_apic_get_reg(apic, APIC_PROCPRI);
566 tpr = kvm_apic_get_reg(apic, APIC_TASKPRI);
567 isr = apic_find_highest_isr(apic);
568 isrv = (isr != -1) ? isr : 0;
570 if ((tpr & 0xf0) >= (isrv & 0xf0))
575 apic_debug("vlapic %p, ppr 0x%x, isr 0x%x, isrv 0x%x",
576 apic, ppr, isr, isrv);
578 if (old_ppr != ppr) {
579 apic_set_reg(apic, APIC_PROCPRI, ppr);
581 kvm_make_request(KVM_REQ_EVENT, apic->vcpu);
585 static void apic_set_tpr(struct kvm_lapic *apic, u32 tpr)
587 apic_set_reg(apic, APIC_TASKPRI, tpr);
588 apic_update_ppr(apic);
591 static bool kvm_apic_broadcast(struct kvm_lapic *apic, u32 dest)
593 return dest == (apic_x2apic_mode(apic) ?
594 X2APIC_BROADCAST : APIC_BROADCAST);
597 static bool kvm_apic_match_physical_addr(struct kvm_lapic *apic, u32 dest)
599 return kvm_apic_id(apic) == dest || kvm_apic_broadcast(apic, dest);
602 static bool kvm_apic_match_logical_addr(struct kvm_lapic *apic, u32 mda)
606 if (kvm_apic_broadcast(apic, mda))
609 logical_id = kvm_apic_get_reg(apic, APIC_LDR);
611 if (apic_x2apic_mode(apic))
612 return ((logical_id >> 16) == (mda >> 16))
613 && (logical_id & mda & 0xffff) != 0;
615 logical_id = GET_APIC_LOGICAL_ID(logical_id);
617 switch (kvm_apic_get_reg(apic, APIC_DFR)) {
619 return (logical_id & mda) != 0;
620 case APIC_DFR_CLUSTER:
621 return ((logical_id >> 4) == (mda >> 4))
622 && (logical_id & mda & 0xf) != 0;
624 apic_debug("Bad DFR vcpu %d: %08x\n",
625 apic->vcpu->vcpu_id, kvm_apic_get_reg(apic, APIC_DFR));
630 bool kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
631 int short_hand, unsigned int dest, int dest_mode)
633 struct kvm_lapic *target = vcpu->arch.apic;
635 apic_debug("target %p, source %p, dest 0x%x, "
636 "dest_mode 0x%x, short_hand 0x%x\n",
637 target, source, dest, dest_mode, short_hand);
640 switch (short_hand) {
641 case APIC_DEST_NOSHORT:
642 if (dest_mode == APIC_DEST_PHYSICAL)
643 return kvm_apic_match_physical_addr(target, dest);
645 return kvm_apic_match_logical_addr(target, dest);
647 return target == source;
648 case APIC_DEST_ALLINC:
650 case APIC_DEST_ALLBUT:
651 return target != source;
653 apic_debug("kvm: apic: Bad dest shorthand value %x\n",
659 bool kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct kvm_lapic *src,
660 struct kvm_lapic_irq *irq, int *r, unsigned long *dest_map)
662 struct kvm_apic_map *map;
663 unsigned long bitmap = 1;
664 struct kvm_lapic **dst;
670 if (irq->shorthand == APIC_DEST_SELF) {
671 *r = kvm_apic_set_irq(src->vcpu, irq, dest_map);
679 map = rcu_dereference(kvm->arch.apic_map);
684 if (irq->dest_id == map->broadcast)
689 if (irq->dest_mode == APIC_DEST_PHYSICAL) {
690 if (irq->dest_id >= ARRAY_SIZE(map->phys_map))
693 dst = &map->phys_map[irq->dest_id];
695 u32 mda = irq->dest_id << (32 - map->ldr_bits);
696 u16 cid = apic_cluster_id(map, mda);
698 if (cid >= ARRAY_SIZE(map->logical_map))
701 dst = map->logical_map[cid];
703 bitmap = apic_logical_id(map, mda);
705 if (irq->delivery_mode == APIC_DM_LOWEST) {
707 for_each_set_bit(i, &bitmap, 16) {
712 else if (kvm_apic_compare_prio(dst[i]->vcpu, dst[l]->vcpu) < 0)
716 bitmap = (l >= 0) ? 1 << l : 0;
720 for_each_set_bit(i, &bitmap, 16) {
725 *r += kvm_apic_set_irq(dst[i]->vcpu, irq, dest_map);
733 * Add a pending IRQ into lapic.
734 * Return 1 if successfully added and 0 if discarded.
736 static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
737 int vector, int level, int trig_mode,
738 unsigned long *dest_map)
741 struct kvm_vcpu *vcpu = apic->vcpu;
743 trace_kvm_apic_accept_irq(vcpu->vcpu_id, delivery_mode,
745 switch (delivery_mode) {
747 vcpu->arch.apic_arb_prio++;
749 /* FIXME add logic for vcpu on reset */
750 if (unlikely(!apic_enabled(apic)))
756 __set_bit(vcpu->vcpu_id, dest_map);
758 if (kvm_x86_ops->deliver_posted_interrupt)
759 kvm_x86_ops->deliver_posted_interrupt(vcpu, vector);
761 apic_set_irr(vector, apic);
763 kvm_make_request(KVM_REQ_EVENT, vcpu);
770 vcpu->arch.pv.pv_unhalted = 1;
771 kvm_make_request(KVM_REQ_EVENT, vcpu);
776 apic_debug("Ignoring guest SMI\n");
781 kvm_inject_nmi(vcpu);
786 if (!trig_mode || level) {
788 /* assumes that there are only KVM_APIC_INIT/SIPI */
789 apic->pending_events = (1UL << KVM_APIC_INIT);
790 /* make sure pending_events is visible before sending
793 kvm_make_request(KVM_REQ_EVENT, vcpu);
796 apic_debug("Ignoring de-assert INIT to vcpu %d\n",
801 case APIC_DM_STARTUP:
802 apic_debug("SIPI to vcpu %d vector 0x%02x\n",
803 vcpu->vcpu_id, vector);
805 apic->sipi_vector = vector;
806 /* make sure sipi_vector is visible for the receiver */
808 set_bit(KVM_APIC_SIPI, &apic->pending_events);
809 kvm_make_request(KVM_REQ_EVENT, vcpu);
815 * Should only be called by kvm_apic_local_deliver() with LVT0,
816 * before NMI watchdog was enabled. Already handled by
817 * kvm_apic_accept_pic_intr().
822 printk(KERN_ERR "TODO: unsupported delivery mode %x\n",
829 int kvm_apic_compare_prio(struct kvm_vcpu *vcpu1, struct kvm_vcpu *vcpu2)
831 return vcpu1->arch.apic_arb_prio - vcpu2->arch.apic_arb_prio;
834 static void kvm_ioapic_send_eoi(struct kvm_lapic *apic, int vector)
836 if (!(kvm_apic_get_reg(apic, APIC_SPIV) & APIC_SPIV_DIRECTED_EOI) &&
837 kvm_ioapic_handles_vector(apic->vcpu->kvm, vector)) {
839 if (apic_test_vector(vector, apic->regs + APIC_TMR))
840 trigger_mode = IOAPIC_LEVEL_TRIG;
842 trigger_mode = IOAPIC_EDGE_TRIG;
843 kvm_ioapic_update_eoi(apic->vcpu, vector, trigger_mode);
847 static int apic_set_eoi(struct kvm_lapic *apic)
849 int vector = apic_find_highest_isr(apic);
851 trace_kvm_eoi(apic, vector);
854 * Not every write EOI will has corresponding ISR,
855 * one example is when Kernel check timer on setup_IO_APIC
860 apic_clear_isr(vector, apic);
861 apic_update_ppr(apic);
863 kvm_ioapic_send_eoi(apic, vector);
864 kvm_make_request(KVM_REQ_EVENT, apic->vcpu);
869 * this interface assumes a trap-like exit, which has already finished
870 * desired side effect including vISR and vPPR update.
872 void kvm_apic_set_eoi_accelerated(struct kvm_vcpu *vcpu, int vector)
874 struct kvm_lapic *apic = vcpu->arch.apic;
876 trace_kvm_eoi(apic, vector);
878 kvm_ioapic_send_eoi(apic, vector);
879 kvm_make_request(KVM_REQ_EVENT, apic->vcpu);
881 EXPORT_SYMBOL_GPL(kvm_apic_set_eoi_accelerated);
883 static void apic_send_ipi(struct kvm_lapic *apic)
885 u32 icr_low = kvm_apic_get_reg(apic, APIC_ICR);
886 u32 icr_high = kvm_apic_get_reg(apic, APIC_ICR2);
887 struct kvm_lapic_irq irq;
889 irq.vector = icr_low & APIC_VECTOR_MASK;
890 irq.delivery_mode = icr_low & APIC_MODE_MASK;
891 irq.dest_mode = icr_low & APIC_DEST_MASK;
892 irq.level = icr_low & APIC_INT_ASSERT;
893 irq.trig_mode = icr_low & APIC_INT_LEVELTRIG;
894 irq.shorthand = icr_low & APIC_SHORT_MASK;
895 if (apic_x2apic_mode(apic))
896 irq.dest_id = icr_high;
898 irq.dest_id = GET_APIC_DEST_FIELD(icr_high);
900 trace_kvm_apic_ipi(icr_low, irq.dest_id);
902 apic_debug("icr_high 0x%x, icr_low 0x%x, "
903 "short_hand 0x%x, dest 0x%x, trig_mode 0x%x, level 0x%x, "
904 "dest_mode 0x%x, delivery_mode 0x%x, vector 0x%x\n",
905 icr_high, icr_low, irq.shorthand, irq.dest_id,
906 irq.trig_mode, irq.level, irq.dest_mode, irq.delivery_mode,
909 kvm_irq_delivery_to_apic(apic->vcpu->kvm, apic, &irq, NULL);
912 static u32 apic_get_tmcct(struct kvm_lapic *apic)
918 ASSERT(apic != NULL);
920 /* if initial count is 0, current count should also be 0 */
921 if (kvm_apic_get_reg(apic, APIC_TMICT) == 0 ||
922 apic->lapic_timer.period == 0)
925 remaining = hrtimer_get_remaining(&apic->lapic_timer.timer);
926 if (ktime_to_ns(remaining) < 0)
927 remaining = ktime_set(0, 0);
929 ns = mod_64(ktime_to_ns(remaining), apic->lapic_timer.period);
930 tmcct = div64_u64(ns,
931 (APIC_BUS_CYCLE_NS * apic->divide_count));
936 static void __report_tpr_access(struct kvm_lapic *apic, bool write)
938 struct kvm_vcpu *vcpu = apic->vcpu;
939 struct kvm_run *run = vcpu->run;
941 kvm_make_request(KVM_REQ_REPORT_TPR_ACCESS, vcpu);
942 run->tpr_access.rip = kvm_rip_read(vcpu);
943 run->tpr_access.is_write = write;
946 static inline void report_tpr_access(struct kvm_lapic *apic, bool write)
948 if (apic->vcpu->arch.tpr_access_reporting)
949 __report_tpr_access(apic, write);
952 static u32 __apic_read(struct kvm_lapic *apic, unsigned int offset)
956 if (offset >= LAPIC_MMIO_LENGTH)
961 if (apic_x2apic_mode(apic))
962 val = kvm_apic_id(apic);
964 val = kvm_apic_id(apic) << 24;
967 apic_debug("Access APIC ARBPRI register which is for P6\n");
970 case APIC_TMCCT: /* Timer CCR */
971 if (apic_lvtt_tscdeadline(apic))
974 val = apic_get_tmcct(apic);
977 apic_update_ppr(apic);
978 val = kvm_apic_get_reg(apic, offset);
981 report_tpr_access(apic, false);
984 val = kvm_apic_get_reg(apic, offset);
991 static inline struct kvm_lapic *to_lapic(struct kvm_io_device *dev)
993 return container_of(dev, struct kvm_lapic, dev);
996 static int apic_reg_read(struct kvm_lapic *apic, u32 offset, int len,
999 unsigned char alignment = offset & 0xf;
1001 /* this bitmask has a bit cleared for each reserved register */
1002 static const u64 rmask = 0x43ff01ffffffe70cULL;
1004 if ((alignment + len) > 4) {
1005 apic_debug("KVM_APIC_READ: alignment error %x %d\n",
1010 if (offset > 0x3f0 || !(rmask & (1ULL << (offset >> 4)))) {
1011 apic_debug("KVM_APIC_READ: read reserved register %x\n",
1016 result = __apic_read(apic, offset & ~0xf);
1018 trace_kvm_apic_read(offset, result);
1024 memcpy(data, (char *)&result + alignment, len);
1027 printk(KERN_ERR "Local APIC read with len = %x, "
1028 "should be 1,2, or 4 instead\n", len);
1034 static int apic_mmio_in_range(struct kvm_lapic *apic, gpa_t addr)
1036 return kvm_apic_hw_enabled(apic) &&
1037 addr >= apic->base_address &&
1038 addr < apic->base_address + LAPIC_MMIO_LENGTH;
1041 static int apic_mmio_read(struct kvm_io_device *this,
1042 gpa_t address, int len, void *data)
1044 struct kvm_lapic *apic = to_lapic(this);
1045 u32 offset = address - apic->base_address;
1047 if (!apic_mmio_in_range(apic, address))
1050 apic_reg_read(apic, offset, len, data);
1055 static void update_divide_count(struct kvm_lapic *apic)
1057 u32 tmp1, tmp2, tdcr;
1059 tdcr = kvm_apic_get_reg(apic, APIC_TDCR);
1061 tmp2 = ((tmp1 & 0x3) | ((tmp1 & 0x8) >> 1)) + 1;
1062 apic->divide_count = 0x1 << (tmp2 & 0x7);
1064 apic_debug("timer divide count is 0x%x\n",
1065 apic->divide_count);
1068 static void apic_timer_expired(struct kvm_lapic *apic)
1070 struct kvm_vcpu *vcpu = apic->vcpu;
1071 wait_queue_head_t *q = &vcpu->wq;
1072 struct kvm_timer *ktimer = &apic->lapic_timer;
1074 if (atomic_read(&apic->lapic_timer.pending))
1077 atomic_inc(&apic->lapic_timer.pending);
1078 kvm_set_pending_timer(vcpu);
1080 if (waitqueue_active(q))
1081 wake_up_interruptible(q);
1083 if (apic_lvtt_tscdeadline(apic))
1084 ktimer->expired_tscdeadline = ktimer->tscdeadline;
1088 * On APICv, this test will cause a busy wait
1089 * during a higher-priority task.
1092 static bool lapic_timer_int_injected(struct kvm_vcpu *vcpu)
1094 struct kvm_lapic *apic = vcpu->arch.apic;
1095 u32 reg = kvm_apic_get_reg(apic, APIC_LVTT);
1097 if (kvm_apic_hw_enabled(apic)) {
1098 int vec = reg & APIC_VECTOR_MASK;
1099 void *bitmap = apic->regs + APIC_ISR;
1101 if (kvm_x86_ops->deliver_posted_interrupt)
1102 bitmap = apic->regs + APIC_IRR;
1104 if (apic_test_vector(vec, bitmap))
1110 void wait_lapic_expire(struct kvm_vcpu *vcpu)
1112 struct kvm_lapic *apic = vcpu->arch.apic;
1113 u64 guest_tsc, tsc_deadline;
1115 if (!kvm_vcpu_has_lapic(vcpu))
1118 if (apic->lapic_timer.expired_tscdeadline == 0)
1121 if (!lapic_timer_int_injected(vcpu))
1124 tsc_deadline = apic->lapic_timer.expired_tscdeadline;
1125 apic->lapic_timer.expired_tscdeadline = 0;
1126 guest_tsc = kvm_x86_ops->read_l1_tsc(vcpu, native_read_tsc());
1127 trace_kvm_wait_lapic_expire(vcpu->vcpu_id, guest_tsc - tsc_deadline);
1129 /* __delay is delay_tsc whenever the hardware has TSC, thus always. */
1130 if (guest_tsc < tsc_deadline)
1131 __delay(tsc_deadline - guest_tsc);
1134 static void start_apic_timer(struct kvm_lapic *apic)
1138 atomic_set(&apic->lapic_timer.pending, 0);
1140 if (apic_lvtt_period(apic) || apic_lvtt_oneshot(apic)) {
1141 /* lapic timer in oneshot or periodic mode */
1142 now = apic->lapic_timer.timer.base->get_time();
1143 apic->lapic_timer.period = (u64)kvm_apic_get_reg(apic, APIC_TMICT)
1144 * APIC_BUS_CYCLE_NS * apic->divide_count;
1146 if (!apic->lapic_timer.period)
1149 * Do not allow the guest to program periodic timers with small
1150 * interval, since the hrtimers are not throttled by the host
1153 if (apic_lvtt_period(apic)) {
1154 s64 min_period = min_timer_period_us * 1000LL;
1156 if (apic->lapic_timer.period < min_period) {
1157 pr_info_ratelimited(
1158 "kvm: vcpu %i: requested %lld ns "
1159 "lapic timer period limited to %lld ns\n",
1160 apic->vcpu->vcpu_id,
1161 apic->lapic_timer.period, min_period);
1162 apic->lapic_timer.period = min_period;
1166 hrtimer_start(&apic->lapic_timer.timer,
1167 ktime_add_ns(now, apic->lapic_timer.period),
1170 apic_debug("%s: bus cycle is %" PRId64 "ns, now 0x%016"
1172 "timer initial count 0x%x, period %lldns, "
1173 "expire @ 0x%016" PRIx64 ".\n", __func__,
1174 APIC_BUS_CYCLE_NS, ktime_to_ns(now),
1175 kvm_apic_get_reg(apic, APIC_TMICT),
1176 apic->lapic_timer.period,
1177 ktime_to_ns(ktime_add_ns(now,
1178 apic->lapic_timer.period)));
1179 } else if (apic_lvtt_tscdeadline(apic)) {
1180 /* lapic timer in tsc deadline mode */
1181 u64 guest_tsc, tscdeadline = apic->lapic_timer.tscdeadline;
1184 struct kvm_vcpu *vcpu = apic->vcpu;
1185 unsigned long this_tsc_khz = vcpu->arch.virtual_tsc_khz;
1186 unsigned long flags;
1188 if (unlikely(!tscdeadline || !this_tsc_khz))
1191 local_irq_save(flags);
1193 now = apic->lapic_timer.timer.base->get_time();
1194 guest_tsc = kvm_x86_ops->read_l1_tsc(vcpu, native_read_tsc());
1195 if (likely(tscdeadline > guest_tsc)) {
1196 ns = (tscdeadline - guest_tsc) * 1000000ULL;
1197 do_div(ns, this_tsc_khz);
1198 expire = ktime_add_ns(now, ns);
1199 expire = ktime_sub_ns(expire, lapic_timer_advance_ns);
1200 hrtimer_start(&apic->lapic_timer.timer,
1201 expire, HRTIMER_MODE_ABS);
1203 apic_timer_expired(apic);
1205 local_irq_restore(flags);
1209 static void apic_manage_nmi_watchdog(struct kvm_lapic *apic, u32 lvt0_val)
1211 int nmi_wd_enabled = apic_lvt_nmi_mode(kvm_apic_get_reg(apic, APIC_LVT0));
1213 if (apic_lvt_nmi_mode(lvt0_val)) {
1214 if (!nmi_wd_enabled) {
1215 apic_debug("Receive NMI setting on APIC_LVT0 "
1216 "for cpu %d\n", apic->vcpu->vcpu_id);
1217 apic->vcpu->kvm->arch.vapics_in_nmi_mode++;
1219 } else if (nmi_wd_enabled)
1220 apic->vcpu->kvm->arch.vapics_in_nmi_mode--;
1223 static int apic_reg_write(struct kvm_lapic *apic, u32 reg, u32 val)
1227 trace_kvm_apic_write(reg, val);
1230 case APIC_ID: /* Local APIC ID */
1231 if (!apic_x2apic_mode(apic))
1232 kvm_apic_set_id(apic, val >> 24);
1238 report_tpr_access(apic, true);
1239 apic_set_tpr(apic, val & 0xff);
1247 if (!apic_x2apic_mode(apic))
1248 kvm_apic_set_ldr(apic, val & APIC_LDR_MASK);
1254 if (!apic_x2apic_mode(apic)) {
1255 apic_set_reg(apic, APIC_DFR, val | 0x0FFFFFFF);
1256 recalculate_apic_map(apic->vcpu->kvm);
1263 if (kvm_apic_get_reg(apic, APIC_LVR) & APIC_LVR_DIRECTED_EOI)
1264 mask |= APIC_SPIV_DIRECTED_EOI;
1265 apic_set_spiv(apic, val & mask);
1266 if (!(val & APIC_SPIV_APIC_ENABLED)) {
1270 for (i = 0; i < APIC_LVT_NUM; i++) {
1271 lvt_val = kvm_apic_get_reg(apic,
1272 APIC_LVTT + 0x10 * i);
1273 apic_set_reg(apic, APIC_LVTT + 0x10 * i,
1274 lvt_val | APIC_LVT_MASKED);
1276 atomic_set(&apic->lapic_timer.pending, 0);
1282 /* No delay here, so we always clear the pending bit */
1283 apic_set_reg(apic, APIC_ICR, val & ~(1 << 12));
1284 apic_send_ipi(apic);
1288 if (!apic_x2apic_mode(apic))
1290 apic_set_reg(apic, APIC_ICR2, val);
1294 apic_manage_nmi_watchdog(apic, val);
1299 /* TODO: Check vector */
1300 if (!kvm_apic_sw_enabled(apic))
1301 val |= APIC_LVT_MASKED;
1303 val &= apic_lvt_mask[(reg - APIC_LVTT) >> 4];
1304 apic_set_reg(apic, reg, val);
1309 u32 timer_mode = val & apic->lapic_timer.timer_mode_mask;
1311 if (apic->lapic_timer.timer_mode != timer_mode) {
1312 apic->lapic_timer.timer_mode = timer_mode;
1313 hrtimer_cancel(&apic->lapic_timer.timer);
1316 if (!kvm_apic_sw_enabled(apic))
1317 val |= APIC_LVT_MASKED;
1318 val &= (apic_lvt_mask[0] | apic->lapic_timer.timer_mode_mask);
1319 apic_set_reg(apic, APIC_LVTT, val);
1324 if (apic_lvtt_tscdeadline(apic))
1327 hrtimer_cancel(&apic->lapic_timer.timer);
1328 apic_set_reg(apic, APIC_TMICT, val);
1329 start_apic_timer(apic);
1334 apic_debug("KVM_WRITE:TDCR %x\n", val);
1335 apic_set_reg(apic, APIC_TDCR, val);
1336 update_divide_count(apic);
1340 if (apic_x2apic_mode(apic) && val != 0) {
1341 apic_debug("KVM_WRITE:ESR not zero %x\n", val);
1347 if (apic_x2apic_mode(apic)) {
1348 apic_reg_write(apic, APIC_ICR, 0x40000 | (val & 0xff));
1357 apic_debug("Local APIC Write to read-only register %x\n", reg);
1361 static int apic_mmio_write(struct kvm_io_device *this,
1362 gpa_t address, int len, const void *data)
1364 struct kvm_lapic *apic = to_lapic(this);
1365 unsigned int offset = address - apic->base_address;
1368 if (!apic_mmio_in_range(apic, address))
1372 * APIC register must be aligned on 128-bits boundary.
1373 * 32/64/128 bits registers must be accessed thru 32 bits.
1376 if (len != 4 || (offset & 0xf)) {
1377 /* Don't shout loud, $infamous_os would cause only noise. */
1378 apic_debug("apic write: bad size=%d %lx\n", len, (long)address);
1384 /* too common printing */
1385 if (offset != APIC_EOI)
1386 apic_debug("%s: offset 0x%x with length 0x%x, and value is "
1387 "0x%x\n", __func__, offset, len, val);
1389 apic_reg_write(apic, offset & 0xff0, val);
1394 void kvm_lapic_set_eoi(struct kvm_vcpu *vcpu)
1396 if (kvm_vcpu_has_lapic(vcpu))
1397 apic_reg_write(vcpu->arch.apic, APIC_EOI, 0);
1399 EXPORT_SYMBOL_GPL(kvm_lapic_set_eoi);
1401 /* emulate APIC access in a trap manner */
1402 void kvm_apic_write_nodecode(struct kvm_vcpu *vcpu, u32 offset)
1406 /* hw has done the conditional check and inst decode */
1409 apic_reg_read(vcpu->arch.apic, offset, 4, &val);
1411 /* TODO: optimize to just emulate side effect w/o one more write */
1412 apic_reg_write(vcpu->arch.apic, offset, val);
1414 EXPORT_SYMBOL_GPL(kvm_apic_write_nodecode);
1416 void kvm_free_lapic(struct kvm_vcpu *vcpu)
1418 struct kvm_lapic *apic = vcpu->arch.apic;
1420 if (!vcpu->arch.apic)
1423 hrtimer_cancel(&apic->lapic_timer.timer);
1425 if (!(vcpu->arch.apic_base & MSR_IA32_APICBASE_ENABLE))
1426 static_key_slow_dec_deferred(&apic_hw_disabled);
1428 if (!apic->sw_enabled)
1429 static_key_slow_dec_deferred(&apic_sw_disabled);
1432 free_page((unsigned long)apic->regs);
1438 *----------------------------------------------------------------------
1440 *----------------------------------------------------------------------
1443 u64 kvm_get_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu)
1445 struct kvm_lapic *apic = vcpu->arch.apic;
1447 if (!kvm_vcpu_has_lapic(vcpu) || apic_lvtt_oneshot(apic) ||
1448 apic_lvtt_period(apic))
1451 return apic->lapic_timer.tscdeadline;
1454 void kvm_set_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu, u64 data)
1456 struct kvm_lapic *apic = vcpu->arch.apic;
1458 if (!kvm_vcpu_has_lapic(vcpu) || apic_lvtt_oneshot(apic) ||
1459 apic_lvtt_period(apic))
1462 hrtimer_cancel(&apic->lapic_timer.timer);
1463 apic->lapic_timer.tscdeadline = data;
1464 start_apic_timer(apic);
1467 void kvm_lapic_set_tpr(struct kvm_vcpu *vcpu, unsigned long cr8)
1469 struct kvm_lapic *apic = vcpu->arch.apic;
1471 if (!kvm_vcpu_has_lapic(vcpu))
1474 apic_set_tpr(apic, ((cr8 & 0x0f) << 4)
1475 | (kvm_apic_get_reg(apic, APIC_TASKPRI) & 4));
1478 u64 kvm_lapic_get_cr8(struct kvm_vcpu *vcpu)
1482 if (!kvm_vcpu_has_lapic(vcpu))
1485 tpr = (u64) kvm_apic_get_reg(vcpu->arch.apic, APIC_TASKPRI);
1487 return (tpr & 0xf0) >> 4;
1490 void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value)
1492 u64 old_value = vcpu->arch.apic_base;
1493 struct kvm_lapic *apic = vcpu->arch.apic;
1496 value |= MSR_IA32_APICBASE_BSP;
1497 vcpu->arch.apic_base = value;
1501 if (!kvm_vcpu_is_bsp(apic->vcpu))
1502 value &= ~MSR_IA32_APICBASE_BSP;
1503 vcpu->arch.apic_base = value;
1505 /* update jump label if enable bit changes */
1506 if ((old_value ^ value) & MSR_IA32_APICBASE_ENABLE) {
1507 if (value & MSR_IA32_APICBASE_ENABLE)
1508 static_key_slow_dec_deferred(&apic_hw_disabled);
1510 static_key_slow_inc(&apic_hw_disabled.key);
1511 recalculate_apic_map(vcpu->kvm);
1514 if ((old_value ^ value) & X2APIC_ENABLE) {
1515 if (value & X2APIC_ENABLE) {
1516 u32 id = kvm_apic_id(apic);
1517 u32 ldr = ((id >> 4) << 16) | (1 << (id & 0xf));
1518 kvm_apic_set_ldr(apic, ldr);
1519 kvm_x86_ops->set_virtual_x2apic_mode(vcpu, true);
1521 kvm_x86_ops->set_virtual_x2apic_mode(vcpu, false);
1524 apic->base_address = apic->vcpu->arch.apic_base &
1525 MSR_IA32_APICBASE_BASE;
1527 if ((value & MSR_IA32_APICBASE_ENABLE) &&
1528 apic->base_address != APIC_DEFAULT_PHYS_BASE)
1529 pr_warn_once("APIC base relocation is unsupported by KVM");
1531 /* with FSB delivery interrupt, we can restart APIC functionality */
1532 apic_debug("apic base msr is 0x%016" PRIx64 ", and base address is "
1533 "0x%lx.\n", apic->vcpu->arch.apic_base, apic->base_address);
1537 void kvm_lapic_reset(struct kvm_vcpu *vcpu)
1539 struct kvm_lapic *apic;
1542 apic_debug("%s\n", __func__);
1545 apic = vcpu->arch.apic;
1546 ASSERT(apic != NULL);
1548 /* Stop the timer in case it's a reset to an active apic */
1549 hrtimer_cancel(&apic->lapic_timer.timer);
1551 kvm_apic_set_id(apic, vcpu->vcpu_id);
1552 kvm_apic_set_version(apic->vcpu);
1554 for (i = 0; i < APIC_LVT_NUM; i++)
1555 apic_set_reg(apic, APIC_LVTT + 0x10 * i, APIC_LVT_MASKED);
1556 apic->lapic_timer.timer_mode = 0;
1557 apic_set_reg(apic, APIC_LVT0,
1558 SET_APIC_DELIVERY_MODE(0, APIC_MODE_EXTINT));
1560 apic_set_reg(apic, APIC_DFR, 0xffffffffU);
1561 apic_set_spiv(apic, 0xff);
1562 apic_set_reg(apic, APIC_TASKPRI, 0);
1563 kvm_apic_set_ldr(apic, 0);
1564 apic_set_reg(apic, APIC_ESR, 0);
1565 apic_set_reg(apic, APIC_ICR, 0);
1566 apic_set_reg(apic, APIC_ICR2, 0);
1567 apic_set_reg(apic, APIC_TDCR, 0);
1568 apic_set_reg(apic, APIC_TMICT, 0);
1569 for (i = 0; i < 8; i++) {
1570 apic_set_reg(apic, APIC_IRR + 0x10 * i, 0);
1571 apic_set_reg(apic, APIC_ISR + 0x10 * i, 0);
1572 apic_set_reg(apic, APIC_TMR + 0x10 * i, 0);
1574 apic->irr_pending = kvm_apic_vid_enabled(vcpu->kvm);
1575 apic->isr_count = kvm_x86_ops->hwapic_isr_update ? 1 : 0;
1576 apic->highest_isr_cache = -1;
1577 update_divide_count(apic);
1578 atomic_set(&apic->lapic_timer.pending, 0);
1579 if (kvm_vcpu_is_bsp(vcpu))
1580 kvm_lapic_set_base(vcpu,
1581 vcpu->arch.apic_base | MSR_IA32_APICBASE_BSP);
1582 vcpu->arch.pv_eoi.msr_val = 0;
1583 apic_update_ppr(apic);
1585 vcpu->arch.apic_arb_prio = 0;
1586 vcpu->arch.apic_attention = 0;
1588 apic_debug("%s: vcpu=%p, id=%d, base_msr="
1589 "0x%016" PRIx64 ", base_address=0x%0lx.\n", __func__,
1590 vcpu, kvm_apic_id(apic),
1591 vcpu->arch.apic_base, apic->base_address);
1595 *----------------------------------------------------------------------
1597 *----------------------------------------------------------------------
1600 static bool lapic_is_periodic(struct kvm_lapic *apic)
1602 return apic_lvtt_period(apic);
1605 int apic_has_pending_timer(struct kvm_vcpu *vcpu)
1607 struct kvm_lapic *apic = vcpu->arch.apic;
1609 if (kvm_vcpu_has_lapic(vcpu) && apic_enabled(apic) &&
1610 apic_lvt_enabled(apic, APIC_LVTT))
1611 return atomic_read(&apic->lapic_timer.pending);
1616 int kvm_apic_local_deliver(struct kvm_lapic *apic, int lvt_type)
1618 u32 reg = kvm_apic_get_reg(apic, lvt_type);
1619 int vector, mode, trig_mode;
1621 if (kvm_apic_hw_enabled(apic) && !(reg & APIC_LVT_MASKED)) {
1622 vector = reg & APIC_VECTOR_MASK;
1623 mode = reg & APIC_MODE_MASK;
1624 trig_mode = reg & APIC_LVT_LEVEL_TRIGGER;
1625 return __apic_accept_irq(apic, mode, vector, 1, trig_mode,
1631 void kvm_apic_nmi_wd_deliver(struct kvm_vcpu *vcpu)
1633 struct kvm_lapic *apic = vcpu->arch.apic;
1636 kvm_apic_local_deliver(apic, APIC_LVT0);
1639 static const struct kvm_io_device_ops apic_mmio_ops = {
1640 .read = apic_mmio_read,
1641 .write = apic_mmio_write,
1644 static enum hrtimer_restart apic_timer_fn(struct hrtimer *data)
1646 struct kvm_timer *ktimer = container_of(data, struct kvm_timer, timer);
1647 struct kvm_lapic *apic = container_of(ktimer, struct kvm_lapic, lapic_timer);
1649 apic_timer_expired(apic);
1651 if (lapic_is_periodic(apic)) {
1652 hrtimer_add_expires_ns(&ktimer->timer, ktimer->period);
1653 return HRTIMER_RESTART;
1655 return HRTIMER_NORESTART;
1658 int kvm_create_lapic(struct kvm_vcpu *vcpu)
1660 struct kvm_lapic *apic;
1662 ASSERT(vcpu != NULL);
1663 apic_debug("apic_init %d\n", vcpu->vcpu_id);
1665 apic = kzalloc(sizeof(*apic), GFP_KERNEL);
1669 vcpu->arch.apic = apic;
1671 apic->regs = (void *)get_zeroed_page(GFP_KERNEL);
1673 printk(KERN_ERR "malloc apic regs error for vcpu %x\n",
1675 goto nomem_free_apic;
1679 hrtimer_init(&apic->lapic_timer.timer, CLOCK_MONOTONIC,
1681 apic->lapic_timer.timer.function = apic_timer_fn;
1684 * APIC is created enabled. This will prevent kvm_lapic_set_base from
1685 * thinking that APIC satet has changed.
1687 vcpu->arch.apic_base = MSR_IA32_APICBASE_ENABLE;
1688 kvm_lapic_set_base(vcpu,
1689 APIC_DEFAULT_PHYS_BASE | MSR_IA32_APICBASE_ENABLE);
1691 static_key_slow_inc(&apic_sw_disabled.key); /* sw disabled at reset */
1692 kvm_lapic_reset(vcpu);
1693 kvm_iodevice_init(&apic->dev, &apic_mmio_ops);
1702 int kvm_apic_has_interrupt(struct kvm_vcpu *vcpu)
1704 struct kvm_lapic *apic = vcpu->arch.apic;
1707 if (!kvm_vcpu_has_lapic(vcpu) || !apic_enabled(apic))
1710 apic_update_ppr(apic);
1711 highest_irr = apic_find_highest_irr(apic);
1712 if ((highest_irr == -1) ||
1713 ((highest_irr & 0xF0) <= kvm_apic_get_reg(apic, APIC_PROCPRI)))
1718 int kvm_apic_accept_pic_intr(struct kvm_vcpu *vcpu)
1720 u32 lvt0 = kvm_apic_get_reg(vcpu->arch.apic, APIC_LVT0);
1723 if (!kvm_apic_hw_enabled(vcpu->arch.apic))
1725 if ((lvt0 & APIC_LVT_MASKED) == 0 &&
1726 GET_APIC_DELIVERY_MODE(lvt0) == APIC_MODE_EXTINT)
1731 void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu)
1733 struct kvm_lapic *apic = vcpu->arch.apic;
1735 if (!kvm_vcpu_has_lapic(vcpu))
1738 if (atomic_read(&apic->lapic_timer.pending) > 0) {
1739 kvm_apic_local_deliver(apic, APIC_LVTT);
1740 if (apic_lvtt_tscdeadline(apic))
1741 apic->lapic_timer.tscdeadline = 0;
1742 atomic_set(&apic->lapic_timer.pending, 0);
1746 int kvm_get_apic_interrupt(struct kvm_vcpu *vcpu)
1748 int vector = kvm_apic_has_interrupt(vcpu);
1749 struct kvm_lapic *apic = vcpu->arch.apic;
1755 * We get here even with APIC virtualization enabled, if doing
1756 * nested virtualization and L1 runs with the "acknowledge interrupt
1757 * on exit" mode. Then we cannot inject the interrupt via RVI,
1758 * because the process would deliver it through the IDT.
1761 apic_set_isr(vector, apic);
1762 apic_update_ppr(apic);
1763 apic_clear_irr(vector, apic);
1767 void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu,
1768 struct kvm_lapic_state *s)
1770 struct kvm_lapic *apic = vcpu->arch.apic;
1772 kvm_lapic_set_base(vcpu, vcpu->arch.apic_base);
1773 /* set SPIV separately to get count of SW disabled APICs right */
1774 apic_set_spiv(apic, *((u32 *)(s->regs + APIC_SPIV)));
1775 memcpy(vcpu->arch.apic->regs, s->regs, sizeof *s);
1776 /* call kvm_apic_set_id() to put apic into apic_map */
1777 kvm_apic_set_id(apic, kvm_apic_id(apic));
1778 kvm_apic_set_version(vcpu);
1780 apic_update_ppr(apic);
1781 hrtimer_cancel(&apic->lapic_timer.timer);
1782 update_divide_count(apic);
1783 start_apic_timer(apic);
1784 apic->irr_pending = true;
1785 apic->isr_count = kvm_x86_ops->hwapic_isr_update ?
1786 1 : count_vectors(apic->regs + APIC_ISR);
1787 apic->highest_isr_cache = -1;
1788 if (kvm_x86_ops->hwapic_irr_update)
1789 kvm_x86_ops->hwapic_irr_update(vcpu,
1790 apic_find_highest_irr(apic));
1791 if (unlikely(kvm_x86_ops->hwapic_isr_update))
1792 kvm_x86_ops->hwapic_isr_update(vcpu->kvm,
1793 apic_find_highest_isr(apic));
1794 kvm_make_request(KVM_REQ_EVENT, vcpu);
1795 kvm_rtc_eoi_tracking_restore_one(vcpu);
1798 void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu)
1800 struct hrtimer *timer;
1802 if (!kvm_vcpu_has_lapic(vcpu))
1805 timer = &vcpu->arch.apic->lapic_timer.timer;
1806 if (hrtimer_cancel(timer))
1807 hrtimer_start_expires(timer, HRTIMER_MODE_ABS);
1811 * apic_sync_pv_eoi_from_guest - called on vmexit or cancel interrupt
1813 * Detect whether guest triggered PV EOI since the
1814 * last entry. If yes, set EOI on guests's behalf.
1815 * Clear PV EOI in guest memory in any case.
1817 static void apic_sync_pv_eoi_from_guest(struct kvm_vcpu *vcpu,
1818 struct kvm_lapic *apic)
1823 * PV EOI state is derived from KVM_APIC_PV_EOI_PENDING in host
1824 * and KVM_PV_EOI_ENABLED in guest memory as follows:
1826 * KVM_APIC_PV_EOI_PENDING is unset:
1827 * -> host disabled PV EOI.
1828 * KVM_APIC_PV_EOI_PENDING is set, KVM_PV_EOI_ENABLED is set:
1829 * -> host enabled PV EOI, guest did not execute EOI yet.
1830 * KVM_APIC_PV_EOI_PENDING is set, KVM_PV_EOI_ENABLED is unset:
1831 * -> host enabled PV EOI, guest executed EOI.
1833 BUG_ON(!pv_eoi_enabled(vcpu));
1834 pending = pv_eoi_get_pending(vcpu);
1836 * Clear pending bit in any case: it will be set again on vmentry.
1837 * While this might not be ideal from performance point of view,
1838 * this makes sure pv eoi is only enabled when we know it's safe.
1840 pv_eoi_clr_pending(vcpu);
1843 vector = apic_set_eoi(apic);
1844 trace_kvm_pv_eoi(apic, vector);
1847 void kvm_lapic_sync_from_vapic(struct kvm_vcpu *vcpu)
1851 if (test_bit(KVM_APIC_PV_EOI_PENDING, &vcpu->arch.apic_attention))
1852 apic_sync_pv_eoi_from_guest(vcpu, vcpu->arch.apic);
1854 if (!test_bit(KVM_APIC_CHECK_VAPIC, &vcpu->arch.apic_attention))
1857 kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.apic->vapic_cache, &data,
1860 apic_set_tpr(vcpu->arch.apic, data & 0xff);
1864 * apic_sync_pv_eoi_to_guest - called before vmentry
1866 * Detect whether it's safe to enable PV EOI and
1869 static void apic_sync_pv_eoi_to_guest(struct kvm_vcpu *vcpu,
1870 struct kvm_lapic *apic)
1872 if (!pv_eoi_enabled(vcpu) ||
1873 /* IRR set or many bits in ISR: could be nested. */
1874 apic->irr_pending ||
1875 /* Cache not set: could be safe but we don't bother. */
1876 apic->highest_isr_cache == -1 ||
1877 /* Need EOI to update ioapic. */
1878 kvm_ioapic_handles_vector(vcpu->kvm, apic->highest_isr_cache)) {
1880 * PV EOI was disabled by apic_sync_pv_eoi_from_guest
1881 * so we need not do anything here.
1886 pv_eoi_set_pending(apic->vcpu);
1889 void kvm_lapic_sync_to_vapic(struct kvm_vcpu *vcpu)
1892 int max_irr, max_isr;
1893 struct kvm_lapic *apic = vcpu->arch.apic;
1895 apic_sync_pv_eoi_to_guest(vcpu, apic);
1897 if (!test_bit(KVM_APIC_CHECK_VAPIC, &vcpu->arch.apic_attention))
1900 tpr = kvm_apic_get_reg(apic, APIC_TASKPRI) & 0xff;
1901 max_irr = apic_find_highest_irr(apic);
1904 max_isr = apic_find_highest_isr(apic);
1907 data = (tpr & 0xff) | ((max_isr & 0xf0) << 8) | (max_irr << 24);
1909 kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.apic->vapic_cache, &data,
1913 int kvm_lapic_set_vapic_addr(struct kvm_vcpu *vcpu, gpa_t vapic_addr)
1916 if (kvm_gfn_to_hva_cache_init(vcpu->kvm,
1917 &vcpu->arch.apic->vapic_cache,
1918 vapic_addr, sizeof(u32)))
1920 __set_bit(KVM_APIC_CHECK_VAPIC, &vcpu->arch.apic_attention);
1922 __clear_bit(KVM_APIC_CHECK_VAPIC, &vcpu->arch.apic_attention);
1925 vcpu->arch.apic->vapic_addr = vapic_addr;
1929 int kvm_x2apic_msr_write(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1931 struct kvm_lapic *apic = vcpu->arch.apic;
1932 u32 reg = (msr - APIC_BASE_MSR) << 4;
1934 if (!irqchip_in_kernel(vcpu->kvm) || !apic_x2apic_mode(apic))
1937 if (reg == APIC_ICR2)
1940 /* if this is ICR write vector before command */
1941 if (reg == APIC_ICR)
1942 apic_reg_write(apic, APIC_ICR2, (u32)(data >> 32));
1943 return apic_reg_write(apic, reg, (u32)data);
1946 int kvm_x2apic_msr_read(struct kvm_vcpu *vcpu, u32 msr, u64 *data)
1948 struct kvm_lapic *apic = vcpu->arch.apic;
1949 u32 reg = (msr - APIC_BASE_MSR) << 4, low, high = 0;
1951 if (!irqchip_in_kernel(vcpu->kvm) || !apic_x2apic_mode(apic))
1954 if (reg == APIC_DFR || reg == APIC_ICR2) {
1955 apic_debug("KVM_APIC_READ: read x2apic reserved register %x\n",
1960 if (apic_reg_read(apic, reg, 4, &low))
1962 if (reg == APIC_ICR)
1963 apic_reg_read(apic, APIC_ICR2, 4, &high);
1965 *data = (((u64)high) << 32) | low;
1970 int kvm_hv_vapic_msr_write(struct kvm_vcpu *vcpu, u32 reg, u64 data)
1972 struct kvm_lapic *apic = vcpu->arch.apic;
1974 if (!kvm_vcpu_has_lapic(vcpu))
1977 /* if this is ICR write vector before command */
1978 if (reg == APIC_ICR)
1979 apic_reg_write(apic, APIC_ICR2, (u32)(data >> 32));
1980 return apic_reg_write(apic, reg, (u32)data);
1983 int kvm_hv_vapic_msr_read(struct kvm_vcpu *vcpu, u32 reg, u64 *data)
1985 struct kvm_lapic *apic = vcpu->arch.apic;
1988 if (!kvm_vcpu_has_lapic(vcpu))
1991 if (apic_reg_read(apic, reg, 4, &low))
1993 if (reg == APIC_ICR)
1994 apic_reg_read(apic, APIC_ICR2, 4, &high);
1996 *data = (((u64)high) << 32) | low;
2001 int kvm_lapic_enable_pv_eoi(struct kvm_vcpu *vcpu, u64 data)
2003 u64 addr = data & ~KVM_MSR_ENABLED;
2004 if (!IS_ALIGNED(addr, 4))
2007 vcpu->arch.pv_eoi.msr_val = data;
2008 if (!pv_eoi_enabled(vcpu))
2010 return kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.pv_eoi.data,
2014 void kvm_apic_accept_events(struct kvm_vcpu *vcpu)
2016 struct kvm_lapic *apic = vcpu->arch.apic;
2020 if (!kvm_vcpu_has_lapic(vcpu) || !apic->pending_events)
2023 pe = xchg(&apic->pending_events, 0);
2025 if (test_bit(KVM_APIC_INIT, &pe)) {
2026 kvm_lapic_reset(vcpu);
2027 kvm_vcpu_reset(vcpu);
2028 if (kvm_vcpu_is_bsp(apic->vcpu))
2029 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
2031 vcpu->arch.mp_state = KVM_MP_STATE_INIT_RECEIVED;
2033 if (test_bit(KVM_APIC_SIPI, &pe) &&
2034 vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) {
2035 /* evaluate pending_events before reading the vector */
2037 sipi_vector = apic->sipi_vector;
2038 apic_debug("vcpu %d received sipi with vector # %x\n",
2039 vcpu->vcpu_id, sipi_vector);
2040 kvm_vcpu_deliver_sipi_vector(vcpu, sipi_vector);
2041 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
2045 void kvm_lapic_init(void)
2047 /* do not patch jump label more than once per second */
2048 jump_label_rate_limit(&apic_hw_disabled, HZ);
2049 jump_label_rate_limit(&apic_sw_disabled, HZ);