1 // SPDX-License-Identifier: GPL-2.0-only
3 * irq_comm.c: Common API for in kernel interrupt controller
4 * Copyright (c) 2007, Intel Corporation.
7 * Yaozu (Eddie) Dong <Eddie.dong@intel.com>
9 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
12 #include <linux/kvm_host.h>
13 #include <linux/slab.h>
14 #include <linux/export.h>
15 #include <linux/rculist.h>
17 #include <trace/events/kvm.h>
29 static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e,
30 struct kvm *kvm, int irq_source_id, int level,
33 struct kvm_pic *pic = kvm->arch.vpic;
34 return kvm_pic_set_irq(pic, e->irqchip.pin, irq_source_id, level);
37 static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e,
38 struct kvm *kvm, int irq_source_id, int level,
41 struct kvm_ioapic *ioapic = kvm->arch.vioapic;
42 return kvm_ioapic_set_irq(ioapic, e->irqchip.pin, irq_source_id, level,
46 int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src,
47 struct kvm_lapic_irq *irq, struct dest_map *dest_map)
50 struct kvm_vcpu *vcpu, *lowest = NULL;
51 unsigned long i, dest_vcpu_bitmap[BITS_TO_LONGS(KVM_MAX_VCPUS)];
52 unsigned int dest_vcpus = 0;
54 if (kvm_irq_delivery_to_apic_fast(kvm, src, irq, &r, dest_map))
57 if (irq->dest_mode == APIC_DEST_PHYSICAL &&
58 irq->dest_id == 0xff && kvm_lowest_prio_delivery(irq)) {
59 printk(KERN_INFO "kvm: apic: phys broadcast and lowest prio\n");
60 irq->delivery_mode = APIC_DM_FIXED;
63 memset(dest_vcpu_bitmap, 0, sizeof(dest_vcpu_bitmap));
65 kvm_for_each_vcpu(i, vcpu, kvm) {
66 if (!kvm_apic_present(vcpu))
69 if (!kvm_apic_match_dest(vcpu, src, irq->shorthand,
70 irq->dest_id, irq->dest_mode))
73 if (!kvm_lowest_prio_delivery(irq)) {
76 r += kvm_apic_set_irq(vcpu, irq, dest_map);
77 } else if (kvm_apic_sw_enabled(vcpu->arch.apic)) {
78 if (!kvm_vector_hashing_enabled()) {
81 else if (kvm_apic_compare_prio(vcpu, lowest) < 0)
84 __set_bit(i, dest_vcpu_bitmap);
90 if (dest_vcpus != 0) {
91 int idx = kvm_vector_to_index(irq->vector, dest_vcpus,
92 dest_vcpu_bitmap, KVM_MAX_VCPUS);
94 lowest = kvm_get_vcpu(kvm, idx);
98 r = kvm_apic_set_irq(lowest, irq, dest_map);
103 void kvm_set_msi_irq(struct kvm *kvm, struct kvm_kernel_irq_routing_entry *e,
104 struct kvm_lapic_irq *irq)
106 struct msi_msg msg = { .address_lo = e->msi.address_lo,
107 .address_hi = e->msi.address_hi,
108 .data = e->msi.data };
110 trace_kvm_msi_set_irq(msg.address_lo | (kvm->arch.x2apic_format ?
111 (u64)msg.address_hi << 32 : 0), msg.data);
113 irq->dest_id = x86_msi_msg_get_destid(&msg, kvm->arch.x2apic_format);
114 irq->vector = msg.arch_data.vector;
115 irq->dest_mode = kvm_lapic_irq_dest_mode(msg.arch_addr_lo.dest_mode_logical);
116 irq->trig_mode = msg.arch_data.is_level;
117 irq->delivery_mode = msg.arch_data.delivery_mode << 8;
118 irq->msi_redir_hint = msg.arch_addr_lo.redirect_hint;
120 irq->shorthand = APIC_DEST_NOSHORT;
122 EXPORT_SYMBOL_GPL(kvm_set_msi_irq);
124 static inline bool kvm_msi_route_invalid(struct kvm *kvm,
125 struct kvm_kernel_irq_routing_entry *e)
127 return kvm->arch.x2apic_format && (e->msi.address_hi & 0xff);
130 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
131 struct kvm *kvm, int irq_source_id, int level, bool line_status)
133 struct kvm_lapic_irq irq;
135 if (kvm_msi_route_invalid(kvm, e))
141 kvm_set_msi_irq(kvm, e, &irq);
143 return kvm_irq_delivery_to_apic(kvm, NULL, &irq, NULL);
147 static int kvm_hv_set_sint(struct kvm_kernel_irq_routing_entry *e,
148 struct kvm *kvm, int irq_source_id, int level,
154 return kvm_hv_synic_set_irq(kvm, e->hv_sint.vcpu, e->hv_sint.sint);
157 int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e,
158 struct kvm *kvm, int irq_source_id, int level,
161 struct kvm_lapic_irq irq;
165 case KVM_IRQ_ROUTING_HV_SINT:
166 return kvm_hv_set_sint(e, kvm, irq_source_id, level,
169 case KVM_IRQ_ROUTING_MSI:
170 if (kvm_msi_route_invalid(kvm, e))
173 kvm_set_msi_irq(kvm, e, &irq);
175 if (kvm_irq_delivery_to_apic_fast(kvm, NULL, &irq, &r, NULL))
179 #ifdef CONFIG_KVM_XEN
180 case KVM_IRQ_ROUTING_XEN_EVTCHN:
184 return kvm_xen_set_evtchn_fast(&e->xen_evtchn, kvm);
193 int kvm_request_irq_source_id(struct kvm *kvm)
195 unsigned long *bitmap = &kvm->arch.irq_sources_bitmap;
198 mutex_lock(&kvm->irq_lock);
199 irq_source_id = find_first_zero_bit(bitmap, BITS_PER_LONG);
201 if (irq_source_id >= BITS_PER_LONG) {
202 printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n");
203 irq_source_id = -EFAULT;
207 ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
208 ASSERT(irq_source_id != KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID);
209 set_bit(irq_source_id, bitmap);
211 mutex_unlock(&kvm->irq_lock);
213 return irq_source_id;
216 void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id)
218 ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
219 ASSERT(irq_source_id != KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID);
221 mutex_lock(&kvm->irq_lock);
222 if (irq_source_id < 0 ||
223 irq_source_id >= BITS_PER_LONG) {
224 printk(KERN_ERR "kvm: IRQ source ID out of range!\n");
227 clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap);
228 if (!irqchip_kernel(kvm))
231 kvm_ioapic_clear_all(kvm->arch.vioapic, irq_source_id);
232 kvm_pic_clear_all(kvm->arch.vpic, irq_source_id);
234 mutex_unlock(&kvm->irq_lock);
237 void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq,
238 struct kvm_irq_mask_notifier *kimn)
240 mutex_lock(&kvm->irq_lock);
242 hlist_add_head_rcu(&kimn->link, &kvm->arch.mask_notifier_list);
243 mutex_unlock(&kvm->irq_lock);
246 void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
247 struct kvm_irq_mask_notifier *kimn)
249 mutex_lock(&kvm->irq_lock);
250 hlist_del_rcu(&kimn->link);
251 mutex_unlock(&kvm->irq_lock);
252 synchronize_srcu(&kvm->irq_srcu);
255 void kvm_fire_mask_notifiers(struct kvm *kvm, unsigned irqchip, unsigned pin,
258 struct kvm_irq_mask_notifier *kimn;
261 idx = srcu_read_lock(&kvm->irq_srcu);
262 gsi = kvm_irq_map_chip_pin(kvm, irqchip, pin);
264 hlist_for_each_entry_rcu(kimn, &kvm->arch.mask_notifier_list, link)
265 if (kimn->irq == gsi)
266 kimn->func(kimn, mask);
267 srcu_read_unlock(&kvm->irq_srcu, idx);
270 bool kvm_arch_can_set_irq_routing(struct kvm *kvm)
272 return irqchip_in_kernel(kvm);
275 int kvm_set_routing_entry(struct kvm *kvm,
276 struct kvm_kernel_irq_routing_entry *e,
277 const struct kvm_irq_routing_entry *ue)
279 /* We can't check irqchip_in_kernel() here as some callers are
280 * currently initializing the irqchip. Other callers should therefore
281 * check kvm_arch_can_set_irq_routing() before calling this function.
284 case KVM_IRQ_ROUTING_IRQCHIP:
285 if (irqchip_split(kvm))
287 e->irqchip.pin = ue->u.irqchip.pin;
288 switch (ue->u.irqchip.irqchip) {
289 case KVM_IRQCHIP_PIC_SLAVE:
290 e->irqchip.pin += PIC_NUM_PINS / 2;
292 case KVM_IRQCHIP_PIC_MASTER:
293 if (ue->u.irqchip.pin >= PIC_NUM_PINS / 2)
295 e->set = kvm_set_pic_irq;
297 case KVM_IRQCHIP_IOAPIC:
298 if (ue->u.irqchip.pin >= KVM_IOAPIC_NUM_PINS)
300 e->set = kvm_set_ioapic_irq;
305 e->irqchip.irqchip = ue->u.irqchip.irqchip;
307 case KVM_IRQ_ROUTING_MSI:
308 e->set = kvm_set_msi;
309 e->msi.address_lo = ue->u.msi.address_lo;
310 e->msi.address_hi = ue->u.msi.address_hi;
311 e->msi.data = ue->u.msi.data;
313 if (kvm_msi_route_invalid(kvm, e))
316 case KVM_IRQ_ROUTING_HV_SINT:
317 e->set = kvm_hv_set_sint;
318 e->hv_sint.vcpu = ue->u.hv_sint.vcpu;
319 e->hv_sint.sint = ue->u.hv_sint.sint;
321 #ifdef CONFIG_KVM_XEN
322 case KVM_IRQ_ROUTING_XEN_EVTCHN:
323 return kvm_xen_setup_evtchn(kvm, e, ue);
332 bool kvm_intr_is_single_vcpu(struct kvm *kvm, struct kvm_lapic_irq *irq,
333 struct kvm_vcpu **dest_vcpu)
337 struct kvm_vcpu *vcpu;
339 if (kvm_intr_is_single_vcpu_fast(kvm, irq, dest_vcpu))
342 kvm_for_each_vcpu(i, vcpu, kvm) {
343 if (!kvm_apic_present(vcpu))
346 if (!kvm_apic_match_dest(vcpu, NULL, irq->shorthand,
347 irq->dest_id, irq->dest_mode))
358 EXPORT_SYMBOL_GPL(kvm_intr_is_single_vcpu);
360 #define IOAPIC_ROUTING_ENTRY(irq) \
361 { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
362 .u.irqchip = { .irqchip = KVM_IRQCHIP_IOAPIC, .pin = (irq) } }
363 #define ROUTING_ENTRY1(irq) IOAPIC_ROUTING_ENTRY(irq)
365 #define PIC_ROUTING_ENTRY(irq) \
366 { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
367 .u.irqchip = { .irqchip = SELECT_PIC(irq), .pin = (irq) % 8 } }
368 #define ROUTING_ENTRY2(irq) \
369 IOAPIC_ROUTING_ENTRY(irq), PIC_ROUTING_ENTRY(irq)
371 static const struct kvm_irq_routing_entry default_routing[] = {
372 ROUTING_ENTRY2(0), ROUTING_ENTRY2(1),
373 ROUTING_ENTRY2(2), ROUTING_ENTRY2(3),
374 ROUTING_ENTRY2(4), ROUTING_ENTRY2(5),
375 ROUTING_ENTRY2(6), ROUTING_ENTRY2(7),
376 ROUTING_ENTRY2(8), ROUTING_ENTRY2(9),
377 ROUTING_ENTRY2(10), ROUTING_ENTRY2(11),
378 ROUTING_ENTRY2(12), ROUTING_ENTRY2(13),
379 ROUTING_ENTRY2(14), ROUTING_ENTRY2(15),
380 ROUTING_ENTRY1(16), ROUTING_ENTRY1(17),
381 ROUTING_ENTRY1(18), ROUTING_ENTRY1(19),
382 ROUTING_ENTRY1(20), ROUTING_ENTRY1(21),
383 ROUTING_ENTRY1(22), ROUTING_ENTRY1(23),
386 int kvm_setup_default_irq_routing(struct kvm *kvm)
388 return kvm_set_irq_routing(kvm, default_routing,
389 ARRAY_SIZE(default_routing), 0);
392 static const struct kvm_irq_routing_entry empty_routing[] = {};
394 int kvm_setup_empty_irq_routing(struct kvm *kvm)
396 return kvm_set_irq_routing(kvm, empty_routing, 0, 0);
399 void kvm_arch_post_irq_routing_update(struct kvm *kvm)
401 if (!irqchip_split(kvm))
403 kvm_make_scan_ioapic_request(kvm);
406 void kvm_scan_ioapic_routes(struct kvm_vcpu *vcpu,
407 ulong *ioapic_handled_vectors)
409 struct kvm *kvm = vcpu->kvm;
410 struct kvm_kernel_irq_routing_entry *entry;
411 struct kvm_irq_routing_table *table;
412 u32 i, nr_ioapic_pins;
415 idx = srcu_read_lock(&kvm->irq_srcu);
416 table = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu);
417 nr_ioapic_pins = min_t(u32, table->nr_rt_entries,
418 kvm->arch.nr_reserved_ioapic_pins);
419 for (i = 0; i < nr_ioapic_pins; ++i) {
420 hlist_for_each_entry(entry, &table->map[i], link) {
421 struct kvm_lapic_irq irq;
423 if (entry->type != KVM_IRQ_ROUTING_MSI)
426 kvm_set_msi_irq(vcpu->kvm, entry, &irq);
429 kvm_apic_match_dest(vcpu, NULL, APIC_DEST_NOSHORT,
430 irq.dest_id, irq.dest_mode))
431 __set_bit(irq.vector, ioapic_handled_vectors);
434 srcu_read_unlock(&kvm->irq_srcu, idx);
437 void kvm_arch_irq_routing_update(struct kvm *kvm)
439 kvm_hv_irq_routing_update(kvm);