1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * irq_comm.c: Common API for in kernel interrupt controller 4 * Copyright (c) 2007, Intel Corporation. 5 * 6 * Authors: 7 * Yaozu (Eddie) Dong <Eddie.dong@intel.com> 8 * 9 * Copyright 2010 Red Hat, Inc. and/or its affiliates. 10 */ 11 12 #include <linux/kvm_host.h> 13 #include <linux/slab.h> 14 #include <linux/export.h> 15 #include <linux/rculist.h> 16 17 #include <trace/events/kvm.h> 18 19 #include <asm/msidef.h> 20 21 #include "irq.h" 22 23 #include "ioapic.h" 24 25 #include "lapic.h" 26 27 #include "hyperv.h" 28 #include "x86.h" 29 30 static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e, 31 struct kvm *kvm, int irq_source_id, int level, 32 bool line_status) 33 { 34 struct kvm_pic *pic = kvm->arch.vpic; 35 return kvm_pic_set_irq(pic, e->irqchip.pin, irq_source_id, level); 36 } 37 38 static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e, 39 struct kvm *kvm, int irq_source_id, int level, 40 bool line_status) 41 { 42 struct kvm_ioapic *ioapic = kvm->arch.vioapic; 43 return kvm_ioapic_set_irq(ioapic, e->irqchip.pin, irq_source_id, level, 44 line_status); 45 } 46 47 int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src, 48 struct kvm_lapic_irq *irq, struct dest_map *dest_map) 49 { 50 int i, r = -1; 51 struct kvm_vcpu *vcpu, *lowest = NULL; 52 unsigned long dest_vcpu_bitmap[BITS_TO_LONGS(KVM_MAX_VCPUS)]; 53 unsigned int dest_vcpus = 0; 54 55 if (irq->dest_mode == 0 && irq->dest_id == 0xff && 56 kvm_lowest_prio_delivery(irq)) { 57 printk(KERN_INFO "kvm: apic: phys broadcast and lowest prio\n"); 58 irq->delivery_mode = APIC_DM_FIXED; 59 } 60 61 if (kvm_irq_delivery_to_apic_fast(kvm, src, irq, &r, dest_map)) 62 return r; 63 64 memset(dest_vcpu_bitmap, 0, sizeof(dest_vcpu_bitmap)); 65 66 kvm_for_each_vcpu(i, vcpu, kvm) { 67 if (!kvm_apic_present(vcpu)) 68 continue; 69 70 if (!kvm_apic_match_dest(vcpu, src, irq->shorthand, 71 irq->dest_id, irq->dest_mode)) 72 continue; 73 74 if (!kvm_lowest_prio_delivery(irq)) { 75 if (r < 0) 76 r = 0; 77 r += kvm_apic_set_irq(vcpu, irq, dest_map); 78 } else if (kvm_apic_sw_enabled(vcpu->arch.apic)) { 79 if (!kvm_vector_hashing_enabled()) { 80 if (!lowest) 81 lowest = vcpu; 82 else if (kvm_apic_compare_prio(vcpu, lowest) < 0) 83 lowest = vcpu; 84 } else { 85 __set_bit(i, dest_vcpu_bitmap); 86 dest_vcpus++; 87 } 88 } 89 } 90 91 if (dest_vcpus != 0) { 92 int idx = kvm_vector_to_index(irq->vector, dest_vcpus, 93 dest_vcpu_bitmap, KVM_MAX_VCPUS); 94 95 lowest = kvm_get_vcpu(kvm, idx); 96 } 97 98 if (lowest) 99 r = kvm_apic_set_irq(lowest, irq, dest_map); 100 101 return r; 102 } 103 104 void kvm_set_msi_irq(struct kvm *kvm, struct kvm_kernel_irq_routing_entry *e, 105 struct kvm_lapic_irq *irq) 106 { 107 trace_kvm_msi_set_irq(e->msi.address_lo | (kvm->arch.x2apic_format ? 108 (u64)e->msi.address_hi << 32 : 0), 109 e->msi.data); 110 111 irq->dest_id = (e->msi.address_lo & 112 MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT; 113 if (kvm->arch.x2apic_format) 114 irq->dest_id |= MSI_ADDR_EXT_DEST_ID(e->msi.address_hi); 115 irq->vector = (e->msi.data & 116 MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT; 117 irq->dest_mode = (1 << MSI_ADDR_DEST_MODE_SHIFT) & e->msi.address_lo; 118 irq->trig_mode = (1 << MSI_DATA_TRIGGER_SHIFT) & e->msi.data; 119 irq->delivery_mode = e->msi.data & 0x700; 120 irq->msi_redir_hint = ((e->msi.address_lo 121 & MSI_ADDR_REDIRECTION_LOWPRI) > 0); 122 irq->level = 1; 123 irq->shorthand = 0; 124 } 125 EXPORT_SYMBOL_GPL(kvm_set_msi_irq); 126 127 static inline bool kvm_msi_route_invalid(struct kvm *kvm, 128 struct kvm_kernel_irq_routing_entry *e) 129 { 130 return kvm->arch.x2apic_format && (e->msi.address_hi & 0xff); 131 } 132 133 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, 134 struct kvm *kvm, int irq_source_id, int level, bool line_status) 135 { 136 struct kvm_lapic_irq irq; 137 138 if (kvm_msi_route_invalid(kvm, e)) 139 return -EINVAL; 140 141 if (!level) 142 return -1; 143 144 kvm_set_msi_irq(kvm, e, &irq); 145 146 return kvm_irq_delivery_to_apic(kvm, NULL, &irq, NULL); 147 } 148 149 150 static int kvm_hv_set_sint(struct kvm_kernel_irq_routing_entry *e, 151 struct kvm *kvm, int irq_source_id, int level, 152 bool line_status) 153 { 154 if (!level) 155 return -1; 156 157 return kvm_hv_synic_set_irq(kvm, e->hv_sint.vcpu, e->hv_sint.sint); 158 } 159 160 int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e, 161 struct kvm *kvm, int irq_source_id, int level, 162 bool line_status) 163 { 164 struct kvm_lapic_irq irq; 165 int r; 166 167 switch (e->type) { 168 case KVM_IRQ_ROUTING_HV_SINT: 169 return kvm_hv_set_sint(e, kvm, irq_source_id, level, 170 line_status); 171 172 case KVM_IRQ_ROUTING_MSI: 173 if (kvm_msi_route_invalid(kvm, e)) 174 return -EINVAL; 175 176 kvm_set_msi_irq(kvm, e, &irq); 177 178 if (kvm_irq_delivery_to_apic_fast(kvm, NULL, &irq, &r, NULL)) 179 return r; 180 break; 181 182 default: 183 break; 184 } 185 186 return -EWOULDBLOCK; 187 } 188 189 int kvm_request_irq_source_id(struct kvm *kvm) 190 { 191 unsigned long *bitmap = &kvm->arch.irq_sources_bitmap; 192 int irq_source_id; 193 194 mutex_lock(&kvm->irq_lock); 195 irq_source_id = find_first_zero_bit(bitmap, BITS_PER_LONG); 196 197 if (irq_source_id >= BITS_PER_LONG) { 198 printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n"); 199 irq_source_id = -EFAULT; 200 goto unlock; 201 } 202 203 ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID); 204 ASSERT(irq_source_id != KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID); 205 set_bit(irq_source_id, bitmap); 206 unlock: 207 mutex_unlock(&kvm->irq_lock); 208 209 return irq_source_id; 210 } 211 212 void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id) 213 { 214 ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID); 215 ASSERT(irq_source_id != KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID); 216 217 mutex_lock(&kvm->irq_lock); 218 if (irq_source_id < 0 || 219 irq_source_id >= BITS_PER_LONG) { 220 printk(KERN_ERR "kvm: IRQ source ID out of range!\n"); 221 goto unlock; 222 } 223 clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap); 224 if (!irqchip_kernel(kvm)) 225 goto unlock; 226 227 kvm_ioapic_clear_all(kvm->arch.vioapic, irq_source_id); 228 kvm_pic_clear_all(kvm->arch.vpic, irq_source_id); 229 unlock: 230 mutex_unlock(&kvm->irq_lock); 231 } 232 233 void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq, 234 struct kvm_irq_mask_notifier *kimn) 235 { 236 mutex_lock(&kvm->irq_lock); 237 kimn->irq = irq; 238 hlist_add_head_rcu(&kimn->link, &kvm->arch.mask_notifier_list); 239 mutex_unlock(&kvm->irq_lock); 240 } 241 242 void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq, 243 struct kvm_irq_mask_notifier *kimn) 244 { 245 mutex_lock(&kvm->irq_lock); 246 hlist_del_rcu(&kimn->link); 247 mutex_unlock(&kvm->irq_lock); 248 synchronize_srcu(&kvm->irq_srcu); 249 } 250 251 void kvm_fire_mask_notifiers(struct kvm *kvm, unsigned irqchip, unsigned pin, 252 bool mask) 253 { 254 struct kvm_irq_mask_notifier *kimn; 255 int idx, gsi; 256 257 idx = srcu_read_lock(&kvm->irq_srcu); 258 gsi = kvm_irq_map_chip_pin(kvm, irqchip, pin); 259 if (gsi != -1) 260 hlist_for_each_entry_rcu(kimn, &kvm->arch.mask_notifier_list, link) 261 if (kimn->irq == gsi) 262 kimn->func(kimn, mask); 263 srcu_read_unlock(&kvm->irq_srcu, idx); 264 } 265 266 bool kvm_arch_can_set_irq_routing(struct kvm *kvm) 267 { 268 return irqchip_in_kernel(kvm); 269 } 270 271 int kvm_set_routing_entry(struct kvm *kvm, 272 struct kvm_kernel_irq_routing_entry *e, 273 const struct kvm_irq_routing_entry *ue) 274 { 275 /* We can't check irqchip_in_kernel() here as some callers are 276 * currently inititalizing the irqchip. Other callers should therefore 277 * check kvm_arch_can_set_irq_routing() before calling this function. 278 */ 279 switch (ue->type) { 280 case KVM_IRQ_ROUTING_IRQCHIP: 281 if (irqchip_split(kvm)) 282 return -EINVAL; 283 e->irqchip.pin = ue->u.irqchip.pin; 284 switch (ue->u.irqchip.irqchip) { 285 case KVM_IRQCHIP_PIC_SLAVE: 286 e->irqchip.pin += PIC_NUM_PINS / 2; 287 /* fall through */ 288 case KVM_IRQCHIP_PIC_MASTER: 289 if (ue->u.irqchip.pin >= PIC_NUM_PINS / 2) 290 return -EINVAL; 291 e->set = kvm_set_pic_irq; 292 break; 293 case KVM_IRQCHIP_IOAPIC: 294 if (ue->u.irqchip.pin >= KVM_IOAPIC_NUM_PINS) 295 return -EINVAL; 296 e->set = kvm_set_ioapic_irq; 297 break; 298 default: 299 return -EINVAL; 300 } 301 e->irqchip.irqchip = ue->u.irqchip.irqchip; 302 break; 303 case KVM_IRQ_ROUTING_MSI: 304 e->set = kvm_set_msi; 305 e->msi.address_lo = ue->u.msi.address_lo; 306 e->msi.address_hi = ue->u.msi.address_hi; 307 e->msi.data = ue->u.msi.data; 308 309 if (kvm_msi_route_invalid(kvm, e)) 310 return -EINVAL; 311 break; 312 case KVM_IRQ_ROUTING_HV_SINT: 313 e->set = kvm_hv_set_sint; 314 e->hv_sint.vcpu = ue->u.hv_sint.vcpu; 315 e->hv_sint.sint = ue->u.hv_sint.sint; 316 break; 317 default: 318 return -EINVAL; 319 } 320 321 return 0; 322 } 323 324 bool kvm_intr_is_single_vcpu(struct kvm *kvm, struct kvm_lapic_irq *irq, 325 struct kvm_vcpu **dest_vcpu) 326 { 327 int i, r = 0; 328 struct kvm_vcpu *vcpu; 329 330 if (kvm_intr_is_single_vcpu_fast(kvm, irq, dest_vcpu)) 331 return true; 332 333 kvm_for_each_vcpu(i, vcpu, kvm) { 334 if (!kvm_apic_present(vcpu)) 335 continue; 336 337 if (!kvm_apic_match_dest(vcpu, NULL, irq->shorthand, 338 irq->dest_id, irq->dest_mode)) 339 continue; 340 341 if (++r == 2) 342 return false; 343 344 *dest_vcpu = vcpu; 345 } 346 347 return r == 1; 348 } 349 EXPORT_SYMBOL_GPL(kvm_intr_is_single_vcpu); 350 351 #define IOAPIC_ROUTING_ENTRY(irq) \ 352 { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \ 353 .u.irqchip = { .irqchip = KVM_IRQCHIP_IOAPIC, .pin = (irq) } } 354 #define ROUTING_ENTRY1(irq) IOAPIC_ROUTING_ENTRY(irq) 355 356 #define PIC_ROUTING_ENTRY(irq) \ 357 { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \ 358 .u.irqchip = { .irqchip = SELECT_PIC(irq), .pin = (irq) % 8 } } 359 #define ROUTING_ENTRY2(irq) \ 360 IOAPIC_ROUTING_ENTRY(irq), PIC_ROUTING_ENTRY(irq) 361 362 static const struct kvm_irq_routing_entry default_routing[] = { 363 ROUTING_ENTRY2(0), ROUTING_ENTRY2(1), 364 ROUTING_ENTRY2(2), ROUTING_ENTRY2(3), 365 ROUTING_ENTRY2(4), ROUTING_ENTRY2(5), 366 ROUTING_ENTRY2(6), ROUTING_ENTRY2(7), 367 ROUTING_ENTRY2(8), ROUTING_ENTRY2(9), 368 ROUTING_ENTRY2(10), ROUTING_ENTRY2(11), 369 ROUTING_ENTRY2(12), ROUTING_ENTRY2(13), 370 ROUTING_ENTRY2(14), ROUTING_ENTRY2(15), 371 ROUTING_ENTRY1(16), ROUTING_ENTRY1(17), 372 ROUTING_ENTRY1(18), ROUTING_ENTRY1(19), 373 ROUTING_ENTRY1(20), ROUTING_ENTRY1(21), 374 ROUTING_ENTRY1(22), ROUTING_ENTRY1(23), 375 }; 376 377 int kvm_setup_default_irq_routing(struct kvm *kvm) 378 { 379 return kvm_set_irq_routing(kvm, default_routing, 380 ARRAY_SIZE(default_routing), 0); 381 } 382 383 static const struct kvm_irq_routing_entry empty_routing[] = {}; 384 385 int kvm_setup_empty_irq_routing(struct kvm *kvm) 386 { 387 return kvm_set_irq_routing(kvm, empty_routing, 0, 0); 388 } 389 390 void kvm_arch_post_irq_routing_update(struct kvm *kvm) 391 { 392 if (!irqchip_split(kvm)) 393 return; 394 kvm_make_scan_ioapic_request(kvm); 395 } 396 397 void kvm_scan_ioapic_routes(struct kvm_vcpu *vcpu, 398 ulong *ioapic_handled_vectors) 399 { 400 struct kvm *kvm = vcpu->kvm; 401 struct kvm_kernel_irq_routing_entry *entry; 402 struct kvm_irq_routing_table *table; 403 u32 i, nr_ioapic_pins; 404 int idx; 405 406 idx = srcu_read_lock(&kvm->irq_srcu); 407 table = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu); 408 nr_ioapic_pins = min_t(u32, table->nr_rt_entries, 409 kvm->arch.nr_reserved_ioapic_pins); 410 for (i = 0; i < nr_ioapic_pins; ++i) { 411 hlist_for_each_entry(entry, &table->map[i], link) { 412 struct kvm_lapic_irq irq; 413 414 if (entry->type != KVM_IRQ_ROUTING_MSI) 415 continue; 416 417 kvm_set_msi_irq(vcpu->kvm, entry, &irq); 418 419 if (irq.level && kvm_apic_match_dest(vcpu, NULL, 0, 420 irq.dest_id, irq.dest_mode)) 421 __set_bit(irq.vector, ioapic_handled_vectors); 422 } 423 } 424 srcu_read_unlock(&kvm->irq_srcu, idx); 425 } 426 427 void kvm_arch_irq_routing_update(struct kvm *kvm) 428 { 429 kvm_hv_irq_routing_update(kvm); 430 } 431