1 /* 2 * irq_comm.c: Common API for in kernel interrupt controller 3 * Copyright (c) 2007, Intel Corporation. 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms and conditions of the GNU General Public License, 7 * version 2, as published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 12 * more details. 13 * 14 * You should have received a copy of the GNU General Public License along with 15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple 16 * Place - Suite 330, Boston, MA 02111-1307 USA. 17 * Authors: 18 * Yaozu (Eddie) Dong <Eddie.dong@intel.com> 19 * 20 * Copyright 2010 Red Hat, Inc. and/or its affiliates. 21 */ 22 23 #include <linux/kvm_host.h> 24 #include <linux/slab.h> 25 #include <linux/export.h> 26 #include <trace/events/kvm.h> 27 28 #include <asm/msidef.h> 29 30 #include "irq.h" 31 32 #include "ioapic.h" 33 34 #include "lapic.h" 35 36 #include "hyperv.h" 37 #include "x86.h" 38 39 static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e, 40 struct kvm *kvm, int irq_source_id, int level, 41 bool line_status) 42 { 43 struct kvm_pic *pic = pic_irqchip(kvm); 44 return kvm_pic_set_irq(pic, e->irqchip.pin, irq_source_id, level); 45 } 46 47 static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e, 48 struct kvm *kvm, int irq_source_id, int level, 49 bool line_status) 50 { 51 struct kvm_ioapic *ioapic = kvm->arch.vioapic; 52 return kvm_ioapic_set_irq(ioapic, e->irqchip.pin, irq_source_id, level, 53 line_status); 54 } 55 56 int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src, 57 struct kvm_lapic_irq *irq, struct dest_map *dest_map) 58 { 59 int i, r = -1; 60 struct kvm_vcpu *vcpu, *lowest = NULL; 61 unsigned long dest_vcpu_bitmap[BITS_TO_LONGS(KVM_MAX_VCPUS)]; 62 unsigned int dest_vcpus = 0; 63 64 if (irq->dest_mode == 0 && irq->dest_id == 0xff && 65 kvm_lowest_prio_delivery(irq)) { 66 printk(KERN_INFO "kvm: apic: phys broadcast and lowest prio\n"); 67 irq->delivery_mode = APIC_DM_FIXED; 68 } 69 70 if (kvm_irq_delivery_to_apic_fast(kvm, src, irq, &r, dest_map)) 71 return r; 72 73 memset(dest_vcpu_bitmap, 0, sizeof(dest_vcpu_bitmap)); 74 75 kvm_for_each_vcpu(i, vcpu, kvm) { 76 if (!kvm_apic_present(vcpu)) 77 continue; 78 79 if (!kvm_apic_match_dest(vcpu, src, irq->shorthand, 80 irq->dest_id, irq->dest_mode)) 81 continue; 82 83 if (!kvm_lowest_prio_delivery(irq)) { 84 if (r < 0) 85 r = 0; 86 r += kvm_apic_set_irq(vcpu, irq, dest_map); 87 } else if (kvm_lapic_enabled(vcpu)) { 88 if (!kvm_vector_hashing_enabled()) { 89 if (!lowest) 90 lowest = vcpu; 91 else if (kvm_apic_compare_prio(vcpu, lowest) < 0) 92 lowest = vcpu; 93 } else { 94 __set_bit(i, dest_vcpu_bitmap); 95 dest_vcpus++; 96 } 97 } 98 } 99 100 if (dest_vcpus != 0) { 101 int idx = kvm_vector_to_index(irq->vector, dest_vcpus, 102 dest_vcpu_bitmap, KVM_MAX_VCPUS); 103 104 lowest = kvm_get_vcpu(kvm, idx); 105 } 106 107 if (lowest) 108 r = kvm_apic_set_irq(lowest, irq, dest_map); 109 110 return r; 111 } 112 113 void kvm_set_msi_irq(struct kvm *kvm, struct kvm_kernel_irq_routing_entry *e, 114 struct kvm_lapic_irq *irq) 115 { 116 trace_kvm_msi_set_irq(e->msi.address_lo | (kvm->arch.x2apic_format ? 117 (u64)e->msi.address_hi << 32 : 0), 118 e->msi.data); 119 120 irq->dest_id = (e->msi.address_lo & 121 MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT; 122 if (kvm->arch.x2apic_format) 123 irq->dest_id |= MSI_ADDR_EXT_DEST_ID(e->msi.address_hi); 124 irq->vector = (e->msi.data & 125 MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT; 126 irq->dest_mode = (1 << MSI_ADDR_DEST_MODE_SHIFT) & e->msi.address_lo; 127 irq->trig_mode = (1 << MSI_DATA_TRIGGER_SHIFT) & e->msi.data; 128 irq->delivery_mode = e->msi.data & 0x700; 129 irq->msi_redir_hint = ((e->msi.address_lo 130 & MSI_ADDR_REDIRECTION_LOWPRI) > 0); 131 irq->level = 1; 132 irq->shorthand = 0; 133 } 134 EXPORT_SYMBOL_GPL(kvm_set_msi_irq); 135 136 static inline bool kvm_msi_route_invalid(struct kvm *kvm, 137 struct kvm_kernel_irq_routing_entry *e) 138 { 139 return kvm->arch.x2apic_format && (e->msi.address_hi & 0xff); 140 } 141 142 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, 143 struct kvm *kvm, int irq_source_id, int level, bool line_status) 144 { 145 struct kvm_lapic_irq irq; 146 147 if (kvm_msi_route_invalid(kvm, e)) 148 return -EINVAL; 149 150 if (!level) 151 return -1; 152 153 kvm_set_msi_irq(kvm, e, &irq); 154 155 return kvm_irq_delivery_to_apic(kvm, NULL, &irq, NULL); 156 } 157 158 159 static int kvm_hv_set_sint(struct kvm_kernel_irq_routing_entry *e, 160 struct kvm *kvm, int irq_source_id, int level, 161 bool line_status) 162 { 163 if (!level) 164 return -1; 165 166 return kvm_hv_synic_set_irq(kvm, e->hv_sint.vcpu, e->hv_sint.sint); 167 } 168 169 int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e, 170 struct kvm *kvm, int irq_source_id, int level, 171 bool line_status) 172 { 173 struct kvm_lapic_irq irq; 174 int r; 175 176 switch (e->type) { 177 case KVM_IRQ_ROUTING_HV_SINT: 178 return kvm_hv_set_sint(e, kvm, irq_source_id, level, 179 line_status); 180 181 case KVM_IRQ_ROUTING_MSI: 182 if (kvm_msi_route_invalid(kvm, e)) 183 return -EINVAL; 184 185 kvm_set_msi_irq(kvm, e, &irq); 186 187 if (kvm_irq_delivery_to_apic_fast(kvm, NULL, &irq, &r, NULL)) 188 return r; 189 break; 190 191 default: 192 break; 193 } 194 195 return -EWOULDBLOCK; 196 } 197 198 int kvm_request_irq_source_id(struct kvm *kvm) 199 { 200 unsigned long *bitmap = &kvm->arch.irq_sources_bitmap; 201 int irq_source_id; 202 203 mutex_lock(&kvm->irq_lock); 204 irq_source_id = find_first_zero_bit(bitmap, BITS_PER_LONG); 205 206 if (irq_source_id >= BITS_PER_LONG) { 207 printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n"); 208 irq_source_id = -EFAULT; 209 goto unlock; 210 } 211 212 ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID); 213 ASSERT(irq_source_id != KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID); 214 set_bit(irq_source_id, bitmap); 215 unlock: 216 mutex_unlock(&kvm->irq_lock); 217 218 return irq_source_id; 219 } 220 221 void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id) 222 { 223 ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID); 224 ASSERT(irq_source_id != KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID); 225 226 mutex_lock(&kvm->irq_lock); 227 if (irq_source_id < 0 || 228 irq_source_id >= BITS_PER_LONG) { 229 printk(KERN_ERR "kvm: IRQ source ID out of range!\n"); 230 goto unlock; 231 } 232 clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap); 233 if (!ioapic_in_kernel(kvm)) 234 goto unlock; 235 236 kvm_ioapic_clear_all(kvm->arch.vioapic, irq_source_id); 237 kvm_pic_clear_all(pic_irqchip(kvm), irq_source_id); 238 unlock: 239 mutex_unlock(&kvm->irq_lock); 240 } 241 242 void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq, 243 struct kvm_irq_mask_notifier *kimn) 244 { 245 mutex_lock(&kvm->irq_lock); 246 kimn->irq = irq; 247 hlist_add_head_rcu(&kimn->link, &kvm->arch.mask_notifier_list); 248 mutex_unlock(&kvm->irq_lock); 249 } 250 251 void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq, 252 struct kvm_irq_mask_notifier *kimn) 253 { 254 mutex_lock(&kvm->irq_lock); 255 hlist_del_rcu(&kimn->link); 256 mutex_unlock(&kvm->irq_lock); 257 synchronize_srcu(&kvm->irq_srcu); 258 } 259 260 void kvm_fire_mask_notifiers(struct kvm *kvm, unsigned irqchip, unsigned pin, 261 bool mask) 262 { 263 struct kvm_irq_mask_notifier *kimn; 264 int idx, gsi; 265 266 idx = srcu_read_lock(&kvm->irq_srcu); 267 gsi = kvm_irq_map_chip_pin(kvm, irqchip, pin); 268 if (gsi != -1) 269 hlist_for_each_entry_rcu(kimn, &kvm->arch.mask_notifier_list, link) 270 if (kimn->irq == gsi) 271 kimn->func(kimn, mask); 272 srcu_read_unlock(&kvm->irq_srcu, idx); 273 } 274 275 int kvm_set_routing_entry(struct kvm *kvm, 276 struct kvm_kernel_irq_routing_entry *e, 277 const struct kvm_irq_routing_entry *ue) 278 { 279 int r = -EINVAL; 280 int delta; 281 unsigned max_pin; 282 283 switch (ue->type) { 284 case KVM_IRQ_ROUTING_IRQCHIP: 285 delta = 0; 286 switch (ue->u.irqchip.irqchip) { 287 case KVM_IRQCHIP_PIC_SLAVE: 288 delta = 8; 289 /* fall through */ 290 case KVM_IRQCHIP_PIC_MASTER: 291 if (!pic_in_kernel(kvm)) 292 goto out; 293 294 e->set = kvm_set_pic_irq; 295 max_pin = PIC_NUM_PINS; 296 break; 297 case KVM_IRQCHIP_IOAPIC: 298 if (!ioapic_in_kernel(kvm)) 299 goto out; 300 301 max_pin = KVM_IOAPIC_NUM_PINS; 302 e->set = kvm_set_ioapic_irq; 303 break; 304 default: 305 goto out; 306 } 307 e->irqchip.irqchip = ue->u.irqchip.irqchip; 308 e->irqchip.pin = ue->u.irqchip.pin + delta; 309 if (e->irqchip.pin >= max_pin) 310 goto out; 311 break; 312 case KVM_IRQ_ROUTING_MSI: 313 e->set = kvm_set_msi; 314 e->msi.address_lo = ue->u.msi.address_lo; 315 e->msi.address_hi = ue->u.msi.address_hi; 316 e->msi.data = ue->u.msi.data; 317 318 if (kvm_msi_route_invalid(kvm, e)) 319 goto out; 320 break; 321 case KVM_IRQ_ROUTING_HV_SINT: 322 e->set = kvm_hv_set_sint; 323 e->hv_sint.vcpu = ue->u.hv_sint.vcpu; 324 e->hv_sint.sint = ue->u.hv_sint.sint; 325 break; 326 default: 327 goto out; 328 } 329 330 r = 0; 331 out: 332 return r; 333 } 334 335 bool kvm_intr_is_single_vcpu(struct kvm *kvm, struct kvm_lapic_irq *irq, 336 struct kvm_vcpu **dest_vcpu) 337 { 338 int i, r = 0; 339 struct kvm_vcpu *vcpu; 340 341 if (kvm_intr_is_single_vcpu_fast(kvm, irq, dest_vcpu)) 342 return true; 343 344 kvm_for_each_vcpu(i, vcpu, kvm) { 345 if (!kvm_apic_present(vcpu)) 346 continue; 347 348 if (!kvm_apic_match_dest(vcpu, NULL, irq->shorthand, 349 irq->dest_id, irq->dest_mode)) 350 continue; 351 352 if (++r == 2) 353 return false; 354 355 *dest_vcpu = vcpu; 356 } 357 358 return r == 1; 359 } 360 EXPORT_SYMBOL_GPL(kvm_intr_is_single_vcpu); 361 362 #define IOAPIC_ROUTING_ENTRY(irq) \ 363 { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \ 364 .u.irqchip = { .irqchip = KVM_IRQCHIP_IOAPIC, .pin = (irq) } } 365 #define ROUTING_ENTRY1(irq) IOAPIC_ROUTING_ENTRY(irq) 366 367 #define PIC_ROUTING_ENTRY(irq) \ 368 { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \ 369 .u.irqchip = { .irqchip = SELECT_PIC(irq), .pin = (irq) % 8 } } 370 #define ROUTING_ENTRY2(irq) \ 371 IOAPIC_ROUTING_ENTRY(irq), PIC_ROUTING_ENTRY(irq) 372 373 static const struct kvm_irq_routing_entry default_routing[] = { 374 ROUTING_ENTRY2(0), ROUTING_ENTRY2(1), 375 ROUTING_ENTRY2(2), ROUTING_ENTRY2(3), 376 ROUTING_ENTRY2(4), ROUTING_ENTRY2(5), 377 ROUTING_ENTRY2(6), ROUTING_ENTRY2(7), 378 ROUTING_ENTRY2(8), ROUTING_ENTRY2(9), 379 ROUTING_ENTRY2(10), ROUTING_ENTRY2(11), 380 ROUTING_ENTRY2(12), ROUTING_ENTRY2(13), 381 ROUTING_ENTRY2(14), ROUTING_ENTRY2(15), 382 ROUTING_ENTRY1(16), ROUTING_ENTRY1(17), 383 ROUTING_ENTRY1(18), ROUTING_ENTRY1(19), 384 ROUTING_ENTRY1(20), ROUTING_ENTRY1(21), 385 ROUTING_ENTRY1(22), ROUTING_ENTRY1(23), 386 }; 387 388 int kvm_setup_default_irq_routing(struct kvm *kvm) 389 { 390 return kvm_set_irq_routing(kvm, default_routing, 391 ARRAY_SIZE(default_routing), 0); 392 } 393 394 static const struct kvm_irq_routing_entry empty_routing[] = {}; 395 396 int kvm_setup_empty_irq_routing(struct kvm *kvm) 397 { 398 return kvm_set_irq_routing(kvm, empty_routing, 0, 0); 399 } 400 401 void kvm_arch_post_irq_routing_update(struct kvm *kvm) 402 { 403 if (!irqchip_split(kvm)) 404 return; 405 kvm_make_scan_ioapic_request(kvm); 406 } 407 408 void kvm_scan_ioapic_routes(struct kvm_vcpu *vcpu, 409 ulong *ioapic_handled_vectors) 410 { 411 struct kvm *kvm = vcpu->kvm; 412 struct kvm_kernel_irq_routing_entry *entry; 413 struct kvm_irq_routing_table *table; 414 u32 i, nr_ioapic_pins; 415 int idx; 416 417 idx = srcu_read_lock(&kvm->irq_srcu); 418 table = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu); 419 nr_ioapic_pins = min_t(u32, table->nr_rt_entries, 420 kvm->arch.nr_reserved_ioapic_pins); 421 for (i = 0; i < nr_ioapic_pins; ++i) { 422 hlist_for_each_entry(entry, &table->map[i], link) { 423 struct kvm_lapic_irq irq; 424 425 if (entry->type != KVM_IRQ_ROUTING_MSI) 426 continue; 427 428 kvm_set_msi_irq(vcpu->kvm, entry, &irq); 429 430 if (irq.level && kvm_apic_match_dest(vcpu, NULL, 0, 431 irq.dest_id, irq.dest_mode)) 432 __set_bit(irq.vector, ioapic_handled_vectors); 433 } 434 } 435 srcu_read_unlock(&kvm->irq_srcu, idx); 436 } 437 438 void kvm_arch_irq_routing_update(struct kvm *kvm) 439 { 440 kvm_hv_irq_routing_update(kvm); 441 } 442