46 #include "ioapic.h"
54 				      struct kvm_ioapic *ioapic,
58 static unsigned long ioapic_read_indirect(struct kvm_ioapic *ioapic)  in ioapic_read_indirect()  argument
62 	switch (ioapic->ioregsel) {  in ioapic_read_indirect()
70 		result = ((ioapic->id & 0xf) << 24);  in ioapic_read_indirect()
75 			u32 redir_index = (ioapic->ioregsel - 0x10) >> 1;  in ioapic_read_indirect()
82 				redir_content = ioapic->redirtbl[index].bits;  in ioapic_read_indirect()
85 			result = (ioapic->ioregsel & 0x1) ?  in ioapic_read_indirect()
95 static void rtc_irq_eoi_tracking_reset(struct kvm_ioapic *ioapic)  in rtc_irq_eoi_tracking_reset()  argument
97 	ioapic->rtc_status.pending_eoi = 0;  in rtc_irq_eoi_tracking_reset()
98 	bitmap_zero(ioapic->rtc_status.dest_map.map, KVM_MAX_VCPU_IDS);  in rtc_irq_eoi_tracking_reset()
101 static void kvm_rtc_eoi_tracking_restore_all(struct kvm_ioapic *ioapic);
103 static void rtc_status_pending_eoi_check_valid(struct kvm_ioapic *ioapic)  in rtc_status_pending_eoi_check_valid()  argument
105 	if (WARN_ON(ioapic->rtc_status.pending_eoi < 0))  in rtc_status_pending_eoi_check_valid()
106 		kvm_rtc_eoi_tracking_restore_all(ioapic);  in rtc_status_pending_eoi_check_valid()
112 	struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic;  in __rtc_irq_eoi_tracking_restore_one()  local
113 	struct dest_map *dest_map = &ioapic->rtc_status.dest_map;  in __rtc_irq_eoi_tracking_restore_one()
116 	e = &ioapic->redirtbl[RTC_GSI];  in __rtc_irq_eoi_tracking_restore_one()
131 		ioapic->rtc_status.pending_eoi++;  in __rtc_irq_eoi_tracking_restore_one()
134 		ioapic->rtc_status.pending_eoi--;  in __rtc_irq_eoi_tracking_restore_one()
135 		rtc_status_pending_eoi_check_valid(ioapic);  in __rtc_irq_eoi_tracking_restore_one()
141 	struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic;  in kvm_rtc_eoi_tracking_restore_one()  local
143 	spin_lock(&ioapic->lock);  in kvm_rtc_eoi_tracking_restore_one()
145 	spin_unlock(&ioapic->lock);  in kvm_rtc_eoi_tracking_restore_one()
148 static void kvm_rtc_eoi_tracking_restore_all(struct kvm_ioapic *ioapic)  in kvm_rtc_eoi_tracking_restore_all()  argument
156 	rtc_irq_eoi_tracking_reset(ioapic);  in kvm_rtc_eoi_tracking_restore_all()
157 	kvm_for_each_vcpu(i, vcpu, ioapic->kvm)  in kvm_rtc_eoi_tracking_restore_all()
161 static void rtc_irq_eoi(struct kvm_ioapic *ioapic, struct kvm_vcpu *vcpu,  in rtc_irq_eoi()  argument
164 	struct dest_map *dest_map = &ioapic->rtc_status.dest_map;  in rtc_irq_eoi()
170 				ioapic->rtc_status.dest_map.map))) {  in rtc_irq_eoi()
171 		--ioapic->rtc_status.pending_eoi;  in rtc_irq_eoi()
172 		rtc_status_pending_eoi_check_valid(ioapic);  in rtc_irq_eoi()
176 static bool rtc_irq_check_coalesced(struct kvm_ioapic *ioapic)  in rtc_irq_check_coalesced()  argument
178 	if (ioapic->rtc_status.pending_eoi > 0)  in rtc_irq_check_coalesced()
184 static void ioapic_lazy_update_eoi(struct kvm_ioapic *ioapic, int irq)  in ioapic_lazy_update_eoi()  argument
188 	union kvm_ioapic_redirect_entry *entry = &ioapic->redirtbl[irq];  in ioapic_lazy_update_eoi()
190 	kvm_for_each_vcpu(i, vcpu, ioapic->kvm) {  in ioapic_lazy_update_eoi()
201 		rtc_irq_eoi(ioapic, vcpu, entry->fields.vector);  in ioapic_lazy_update_eoi()
206 static int ioapic_set_irq(struct kvm_ioapic *ioapic, unsigned int irq,  in ioapic_set_irq()  argument
214 	entry = ioapic->redirtbl[irq];  in ioapic_set_irq()
218 		ioapic->irr &= ~mask;  in ioapic_set_irq()
225 	 * triggered, in which case the in-kernel IOAPIC will not be able  in ioapic_set_irq()
227 	 * pending EOI when trying to set IOAPIC irq.  in ioapic_set_irq()
229 	if (edge && kvm_apicv_activated(ioapic->kvm))  in ioapic_set_irq()
230 		ioapic_lazy_update_eoi(ioapic, irq);  in ioapic_set_irq()
244 		rtc_irq_check_coalesced(ioapic)) {  in ioapic_set_irq()
249 	old_irr = ioapic->irr;  in ioapic_set_irq()
250 	ioapic->irr |= mask;  in ioapic_set_irq()
252 		ioapic->irr_delivered &= ~mask;  in ioapic_set_irq()
253 		if (old_irr == ioapic->irr) {  in ioapic_set_irq()
259 	ret = ioapic_service(ioapic, irq, line_status);  in ioapic_set_irq()
266 static void kvm_ioapic_inject_all(struct kvm_ioapic *ioapic, unsigned long irr)  in kvm_ioapic_inject_all()  argument
270 	rtc_irq_eoi_tracking_reset(ioapic);  in kvm_ioapic_inject_all()
272 		ioapic_set_irq(ioapic, idx, 1, true);  in kvm_ioapic_inject_all()
274 	kvm_rtc_eoi_tracking_restore_all(ioapic);  in kvm_ioapic_inject_all()
280 	struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic;  in kvm_ioapic_scan_entry()  local
281 	struct dest_map *dest_map = &ioapic->rtc_status.dest_map;  in kvm_ioapic_scan_entry()
285 	spin_lock(&ioapic->lock);  in kvm_ioapic_scan_entry()
293 		e = &ioapic->redirtbl[index];  in kvm_ioapic_scan_entry()
295 		    kvm_irq_has_notifier(ioapic->kvm, KVM_IRQCHIP_IOAPIC, index) ||  in kvm_ioapic_scan_entry()
306 	spin_unlock(&ioapic->lock);  in kvm_ioapic_scan_entry()
316 static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)  in ioapic_write_indirect()  argument
324 	switch (ioapic->ioregsel) {  in ioapic_write_indirect()
330 		ioapic->id = (val >> 24) & 0xf;  in ioapic_write_indirect()
337 		index = (ioapic->ioregsel - 0x10) >> 1;  in ioapic_write_indirect()
342 		e = &ioapic->redirtbl[index];  in ioapic_write_indirect()
349 		if (ioapic->ioregsel & 1) {  in ioapic_write_indirect()
361 		 * be cleared by IOAPIC hardware when the entry is configured  in ioapic_write_indirect()
370 			kvm_fire_mask_notifiers(ioapic->kvm, KVM_IRQCHIP_IOAPIC, index, mask_after);  in ioapic_write_indirect()
372 		    ioapic->irr & (1 << index) && !e->fields.mask && !e->fields.remote_irr) {  in ioapic_write_indirect()
399 			if (kvm_notify_irqfd_resampler(ioapic->kvm, KVM_IRQCHIP_IOAPIC, index))  in ioapic_write_indirect()
400 				ioapic->irr &= ~(1 << index);  in ioapic_write_indirect()
402 				ioapic_service(ioapic, index, false);  in ioapic_write_indirect()
417 			kvm_bitmap_or_dest_vcpus(ioapic->kvm, &irq,  in ioapic_write_indirect()
430 				kvm_bitmap_or_dest_vcpus(ioapic->kvm, &irq,  in ioapic_write_indirect()
433 			kvm_make_scan_ioapic_request_mask(ioapic->kvm,  in ioapic_write_indirect()
436 			kvm_make_scan_ioapic_request(ioapic->kvm);  in ioapic_write_indirect()
442 static int ioapic_service(struct kvm_ioapic *ioapic, int irq, bool line_status)  in ioapic_service()  argument
444 	union kvm_ioapic_redirect_entry *entry = &ioapic->redirtbl[irq];  in ioapic_service()
463 		ioapic->irr_delivered |= 1 << irq;  in ioapic_service()
472 		BUG_ON(ioapic->rtc_status.pending_eoi != 0);  in ioapic_service()
473 		ret = kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe,  in ioapic_service()
474 					       &ioapic->rtc_status.dest_map);  in ioapic_service()
475 		ioapic->rtc_status.pending_eoi = (ret < 0 ? 0 : ret);  in ioapic_service()
477 		ret = kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe, NULL);  in ioapic_service()
485 int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int irq_source_id,  in kvm_ioapic_set_irq()  argument
492 	spin_lock(&ioapic->lock);  in kvm_ioapic_set_irq()
493 	irq_level = __kvm_irq_line_state(&ioapic->irq_states[irq],  in kvm_ioapic_set_irq()
495 	ret = ioapic_set_irq(ioapic, irq, irq_level, line_status);  in kvm_ioapic_set_irq()
497 	spin_unlock(&ioapic->lock);  in kvm_ioapic_set_irq()
502 void kvm_ioapic_clear_all(struct kvm_ioapic *ioapic, int irq_source_id)  in kvm_ioapic_clear_all()  argument
506 	spin_lock(&ioapic->lock);  in kvm_ioapic_clear_all()
508 		__clear_bit(irq_source_id, &ioapic->irq_states[i]);  in kvm_ioapic_clear_all()
509 	spin_unlock(&ioapic->lock);  in kvm_ioapic_clear_all()
515 	struct kvm_ioapic *ioapic = container_of(work, struct kvm_ioapic,  in kvm_ioapic_eoi_inject_work()  local
517 	spin_lock(&ioapic->lock);  in kvm_ioapic_eoi_inject_work()
519 		union kvm_ioapic_redirect_entry *ent = &ioapic->redirtbl[i];  in kvm_ioapic_eoi_inject_work()
524 		if (ioapic->irr & (1 << i) && !ent->fields.remote_irr)  in kvm_ioapic_eoi_inject_work()
525 			ioapic_service(ioapic, i, false);  in kvm_ioapic_eoi_inject_work()
527 	spin_unlock(&ioapic->lock);  in kvm_ioapic_eoi_inject_work()
532 				      struct kvm_ioapic *ioapic,  in kvm_ioapic_update_eoi_one()  argument
537 	union kvm_ioapic_redirect_entry *ent = &ioapic->redirtbl[pin];  in kvm_ioapic_update_eoi_one()
541 	 * notifier callbacks for assigned devices call into IOAPIC  in kvm_ioapic_update_eoi_one()
547 	spin_unlock(&ioapic->lock);  in kvm_ioapic_update_eoi_one()
548 	kvm_notify_acked_irq(ioapic->kvm, KVM_IRQCHIP_IOAPIC, pin);  in kvm_ioapic_update_eoi_one()
549 	spin_lock(&ioapic->lock);  in kvm_ioapic_update_eoi_one()
557 	if (!ent->fields.mask && (ioapic->irr & (1 << pin))) {  in kvm_ioapic_update_eoi_one()
558 		++ioapic->irq_eoi[pin];  in kvm_ioapic_update_eoi_one()
559 		if (ioapic->irq_eoi[pin] == IOAPIC_SUCCESSIVE_IRQ_MAX_COUNT) {  in kvm_ioapic_update_eoi_one()
568 			schedule_delayed_work(&ioapic->eoi_inject, HZ / 100);  in kvm_ioapic_update_eoi_one()
569 			ioapic->irq_eoi[pin] = 0;  in kvm_ioapic_update_eoi_one()
572 			ioapic_service(ioapic, pin, false);  in kvm_ioapic_update_eoi_one()
575 		ioapic->irq_eoi[pin] = 0;  in kvm_ioapic_update_eoi_one()
582 	struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic;  in kvm_ioapic_update_eoi()  local
584 	spin_lock(&ioapic->lock);  in kvm_ioapic_update_eoi()
585 	rtc_irq_eoi(ioapic, vcpu, vector);  in kvm_ioapic_update_eoi()
587 		union kvm_ioapic_redirect_entry *ent = &ioapic->redirtbl[i];  in kvm_ioapic_update_eoi()
591 		kvm_ioapic_update_eoi_one(vcpu, ioapic, trigger_mode, i);  in kvm_ioapic_update_eoi()
593 	spin_unlock(&ioapic->lock);  in kvm_ioapic_update_eoi()
601 static inline int ioapic_in_range(struct kvm_ioapic *ioapic, gpa_t addr)  in ioapic_in_range()  argument
603 	return ((addr >= ioapic->base_address &&  in ioapic_in_range()
604 		 (addr < ioapic->base_address + IOAPIC_MEM_LENGTH)));  in ioapic_in_range()
610 	struct kvm_ioapic *ioapic = to_ioapic(this);  in ioapic_mmio_read()  local
612 	if (!ioapic_in_range(ioapic, addr))  in ioapic_mmio_read()
618 	spin_lock(&ioapic->lock);  in ioapic_mmio_read()
621 		result = ioapic->ioregsel;  in ioapic_mmio_read()
625 		result = ioapic_read_indirect(ioapic);  in ioapic_mmio_read()
632 	spin_unlock(&ioapic->lock);  in ioapic_mmio_read()
644 		printk(KERN_WARNING "ioapic: wrong length %d\n", len);  in ioapic_mmio_read()
652 	struct kvm_ioapic *ioapic = to_ioapic(this);  in ioapic_mmio_write()  local
654 	if (!ioapic_in_range(ioapic, addr))  in ioapic_mmio_write()
671 		printk(KERN_WARNING "ioapic: Unsupported size %d\n", len);  in ioapic_mmio_write()
676 	spin_lock(&ioapic->lock);  in ioapic_mmio_write()
679 		ioapic->ioregsel = data & 0xFF; /* 8-bit register */  in ioapic_mmio_write()
683 		ioapic_write_indirect(ioapic, data);  in ioapic_mmio_write()
689 	spin_unlock(&ioapic->lock);  in ioapic_mmio_write()
693 static void kvm_ioapic_reset(struct kvm_ioapic *ioapic)  in kvm_ioapic_reset()  argument
697 	cancel_delayed_work_sync(&ioapic->eoi_inject);  in kvm_ioapic_reset()
699 		ioapic->redirtbl[i].fields.mask = 1;  in kvm_ioapic_reset()
700 	ioapic->base_address = IOAPIC_DEFAULT_BASE_ADDRESS;  in kvm_ioapic_reset()
701 	ioapic->ioregsel = 0;  in kvm_ioapic_reset()
702 	ioapic->irr = 0;  in kvm_ioapic_reset()
703 	ioapic->irr_delivered = 0;  in kvm_ioapic_reset()
704 	ioapic->id = 0;  in kvm_ioapic_reset()
705 	memset(ioapic->irq_eoi, 0x00, sizeof(ioapic->irq_eoi));  in kvm_ioapic_reset()
706 	rtc_irq_eoi_tracking_reset(ioapic);  in kvm_ioapic_reset()
716 	struct kvm_ioapic *ioapic;  in kvm_ioapic_init()  local
719 	ioapic = kzalloc(sizeof(struct kvm_ioapic), GFP_KERNEL_ACCOUNT);  in kvm_ioapic_init()
720 	if (!ioapic)  in kvm_ioapic_init()
722 	spin_lock_init(&ioapic->lock);  in kvm_ioapic_init()
723 	INIT_DELAYED_WORK(&ioapic->eoi_inject, kvm_ioapic_eoi_inject_work);  in kvm_ioapic_init()
724 	kvm->arch.vioapic = ioapic;  in kvm_ioapic_init()
725 	kvm_ioapic_reset(ioapic);  in kvm_ioapic_init()
726 	kvm_iodevice_init(&ioapic->dev, &ioapic_mmio_ops);  in kvm_ioapic_init()
727 	ioapic->kvm = kvm;  in kvm_ioapic_init()
729 	ret = kvm_io_bus_register_dev(kvm, KVM_MMIO_BUS, ioapic->base_address,  in kvm_ioapic_init()
730 				      IOAPIC_MEM_LENGTH, &ioapic->dev);  in kvm_ioapic_init()
734 		kfree(ioapic);  in kvm_ioapic_init()
742 	struct kvm_ioapic *ioapic = kvm->arch.vioapic;  in kvm_ioapic_destroy()  local
744 	if (!ioapic)  in kvm_ioapic_destroy()
747 	cancel_delayed_work_sync(&ioapic->eoi_inject);  in kvm_ioapic_destroy()
749 	kvm_io_bus_unregister_dev(kvm, KVM_MMIO_BUS, &ioapic->dev);  in kvm_ioapic_destroy()
752 	kfree(ioapic);  in kvm_ioapic_destroy()
757 	struct kvm_ioapic *ioapic = kvm->arch.vioapic;  in kvm_get_ioapic()  local
759 	spin_lock(&ioapic->lock);  in kvm_get_ioapic()
760 	memcpy(state, ioapic, sizeof(struct kvm_ioapic_state));  in kvm_get_ioapic()
761 	state->irr &= ~ioapic->irr_delivered;  in kvm_get_ioapic()
762 	spin_unlock(&ioapic->lock);  in kvm_get_ioapic()
767 	struct kvm_ioapic *ioapic = kvm->arch.vioapic;  in kvm_set_ioapic()  local
769 	spin_lock(&ioapic->lock);  in kvm_set_ioapic()
770 	memcpy(ioapic, state, sizeof(struct kvm_ioapic_state));  in kvm_set_ioapic()
771 	ioapic->irr = 0;  in kvm_set_ioapic()
772 	ioapic->irr_delivered = 0;  in kvm_set_ioapic()
774 	kvm_ioapic_inject_all(ioapic, state->irr);  in kvm_set_ioapic()
775 	spin_unlock(&ioapic->lock);  in kvm_set_ioapic()