1 #include "kvm/virtio-pci.h" 2 3 #include "kvm/ioport.h" 4 #include "kvm/kvm.h" 5 #include "kvm/kvm-cpu.h" 6 #include "kvm/virtio-pci-dev.h" 7 #include "kvm/irq.h" 8 #include "kvm/virtio.h" 9 #include "kvm/ioeventfd.h" 10 #include "kvm/util.h" 11 12 #include <sys/ioctl.h> 13 #include <linux/virtio_pci.h> 14 #include <linux/byteorder.h> 15 #include <assert.h> 16 #include <string.h> 17 18 #define ALIGN_UP(x, s) ALIGN((x) + (s) - 1, (s)) 19 #define VIRTIO_NR_MSIX (VIRTIO_PCI_MAX_VQ + VIRTIO_PCI_MAX_CONFIG) 20 #define VIRTIO_MSIX_TABLE_SIZE (VIRTIO_NR_MSIX * 16) 21 #define VIRTIO_MSIX_PBA_SIZE (ALIGN_UP(VIRTIO_MSIX_TABLE_SIZE, 64) / 8) 22 #define VIRTIO_MSIX_BAR_SIZE (1UL << fls_long(VIRTIO_MSIX_TABLE_SIZE + \ 23 VIRTIO_MSIX_PBA_SIZE)) 24 25 static u16 virtio_pci__port_addr(struct virtio_pci *vpci) 26 { 27 return pci__bar_address(&vpci->pci_hdr, 0); 28 } 29 30 static u32 virtio_pci__mmio_addr(struct virtio_pci *vpci) 31 { 32 return pci__bar_address(&vpci->pci_hdr, 1); 33 } 34 35 static u32 virtio_pci__msix_io_addr(struct virtio_pci *vpci) 36 { 37 return pci__bar_address(&vpci->pci_hdr, 2); 38 } 39 40 static void virtio_pci__ioevent_callback(struct kvm *kvm, void *param) 41 { 42 struct virtio_pci_ioevent_param *ioeventfd = param; 43 struct virtio_pci *vpci = ioeventfd->vdev->virtio; 44 45 ioeventfd->vdev->ops->notify_vq(kvm, vpci->dev, ioeventfd->vq); 46 } 47 48 static int virtio_pci__init_ioeventfd(struct kvm *kvm, struct virtio_device *vdev, u32 vq) 49 { 50 struct ioevent ioevent; 51 struct virtio_pci *vpci = vdev->virtio; 52 u32 mmio_addr = virtio_pci__mmio_addr(vpci); 53 u16 port_addr = virtio_pci__port_addr(vpci); 54 int r, flags = 0; 55 int fd; 56 57 vpci->ioeventfds[vq] = (struct virtio_pci_ioevent_param) { 58 .vdev = vdev, 59 .vq = vq, 60 }; 61 62 ioevent = (struct ioevent) { 63 .fn = virtio_pci__ioevent_callback, 64 .fn_ptr = &vpci->ioeventfds[vq], 65 .datamatch = vq, 66 .fn_kvm = kvm, 67 }; 68 69 /* 70 * Vhost will poll the eventfd in host kernel side, otherwise we 71 * need to poll in userspace. 72 */ 73 if (!vdev->use_vhost) 74 flags |= IOEVENTFD_FLAG_USER_POLL; 75 76 /* ioport */ 77 ioevent.io_addr = port_addr + VIRTIO_PCI_QUEUE_NOTIFY; 78 ioevent.io_len = sizeof(u16); 79 ioevent.fd = fd = eventfd(0, 0); 80 r = ioeventfd__add_event(&ioevent, flags | IOEVENTFD_FLAG_PIO); 81 if (r) 82 return r; 83 84 /* mmio */ 85 ioevent.io_addr = mmio_addr + VIRTIO_PCI_QUEUE_NOTIFY; 86 ioevent.io_len = sizeof(u16); 87 ioevent.fd = eventfd(0, 0); 88 r = ioeventfd__add_event(&ioevent, flags); 89 if (r) 90 goto free_ioport_evt; 91 92 if (vdev->ops->notify_vq_eventfd) 93 vdev->ops->notify_vq_eventfd(kvm, vpci->dev, vq, fd); 94 return 0; 95 96 free_ioport_evt: 97 ioeventfd__del_event(port_addr + VIRTIO_PCI_QUEUE_NOTIFY, vq); 98 return r; 99 } 100 101 static void virtio_pci_exit_vq(struct kvm *kvm, struct virtio_device *vdev, 102 int vq) 103 { 104 struct virtio_pci *vpci = vdev->virtio; 105 u32 mmio_addr = virtio_pci__mmio_addr(vpci); 106 u16 port_addr = virtio_pci__port_addr(vpci); 107 108 ioeventfd__del_event(mmio_addr + VIRTIO_PCI_QUEUE_NOTIFY, vq); 109 ioeventfd__del_event(port_addr + VIRTIO_PCI_QUEUE_NOTIFY, vq); 110 virtio_exit_vq(kvm, vdev, vpci->dev, vq); 111 } 112 113 static inline bool virtio_pci__msix_enabled(struct virtio_pci *vpci) 114 { 115 return vpci->pci_hdr.msix.ctrl & cpu_to_le16(PCI_MSIX_FLAGS_ENABLE); 116 } 117 118 static bool virtio_pci__specific_data_in(struct kvm *kvm, struct virtio_device *vdev, 119 void *data, u32 size, unsigned long offset) 120 { 121 u32 config_offset; 122 struct virtio_pci *vpci = vdev->virtio; 123 int type = virtio__get_dev_specific_field(offset - 20, 124 virtio_pci__msix_enabled(vpci), 125 &config_offset); 126 if (type == VIRTIO_PCI_O_MSIX) { 127 switch (offset) { 128 case VIRTIO_MSI_CONFIG_VECTOR: 129 ioport__write16(data, vpci->config_vector); 130 break; 131 case VIRTIO_MSI_QUEUE_VECTOR: 132 ioport__write16(data, vpci->vq_vector[vpci->queue_selector]); 133 break; 134 }; 135 136 return true; 137 } else if (type == VIRTIO_PCI_O_CONFIG) { 138 u8 cfg; 139 size_t config_size; 140 141 config_size = vdev->ops->get_config_size(kvm, vpci->dev); 142 if (config_offset + size > config_size) { 143 /* Access goes beyond the config size, so return failure. */ 144 WARN_ONCE(1, "Config access offset (%u) is beyond config size (%zu)\n", 145 config_offset, config_size); 146 return false; 147 } 148 149 /* TODO: Handle access lengths beyond one byte */ 150 if (size != 1) { 151 WARN_ONCE(1, "Size (%u) not supported\n", size); 152 return false; 153 } 154 cfg = vdev->ops->get_config(kvm, vpci->dev)[config_offset]; 155 ioport__write8(data, cfg); 156 return true; 157 } 158 159 return false; 160 } 161 162 static bool virtio_pci__data_in(struct kvm_cpu *vcpu, struct virtio_device *vdev, 163 unsigned long offset, void *data, u32 size) 164 { 165 bool ret = true; 166 struct virtio_pci *vpci; 167 struct virt_queue *vq; 168 struct kvm *kvm; 169 u32 val; 170 171 kvm = vcpu->kvm; 172 vpci = vdev->virtio; 173 174 switch (offset) { 175 case VIRTIO_PCI_HOST_FEATURES: 176 val = vdev->ops->get_host_features(kvm, vpci->dev); 177 ioport__write32(data, val); 178 break; 179 case VIRTIO_PCI_QUEUE_PFN: 180 vq = vdev->ops->get_vq(kvm, vpci->dev, vpci->queue_selector); 181 ioport__write32(data, vq->pfn); 182 break; 183 case VIRTIO_PCI_QUEUE_NUM: 184 val = vdev->ops->get_size_vq(kvm, vpci->dev, vpci->queue_selector); 185 ioport__write16(data, val); 186 break; 187 case VIRTIO_PCI_STATUS: 188 ioport__write8(data, vpci->status); 189 break; 190 case VIRTIO_PCI_ISR: 191 ioport__write8(data, vpci->isr); 192 kvm__irq_line(kvm, vpci->legacy_irq_line, VIRTIO_IRQ_LOW); 193 vpci->isr = VIRTIO_IRQ_LOW; 194 break; 195 default: 196 ret = virtio_pci__specific_data_in(kvm, vdev, data, size, offset); 197 break; 198 }; 199 200 return ret; 201 } 202 203 static void update_msix_map(struct virtio_pci *vpci, 204 struct msix_table *msix_entry, u32 vecnum) 205 { 206 u32 gsi, i; 207 208 /* Find the GSI number used for that vector */ 209 if (vecnum == vpci->config_vector) { 210 gsi = vpci->config_gsi; 211 } else { 212 for (i = 0; i < VIRTIO_PCI_MAX_VQ; i++) 213 if (vpci->vq_vector[i] == vecnum) 214 break; 215 if (i == VIRTIO_PCI_MAX_VQ) 216 return; 217 gsi = vpci->gsis[i]; 218 } 219 220 if (gsi == 0) 221 return; 222 223 msix_entry = &msix_entry[vecnum]; 224 irq__update_msix_route(vpci->kvm, gsi, &msix_entry->msg); 225 } 226 227 static bool virtio_pci__specific_data_out(struct kvm *kvm, struct virtio_device *vdev, 228 void *data, u32 size, unsigned long offset) 229 { 230 struct virtio_pci *vpci = vdev->virtio; 231 u32 config_offset, vec; 232 int gsi; 233 int type = virtio__get_dev_specific_field(offset - 20, virtio_pci__msix_enabled(vpci), 234 &config_offset); 235 if (type == VIRTIO_PCI_O_MSIX) { 236 switch (offset) { 237 case VIRTIO_MSI_CONFIG_VECTOR: 238 vec = vpci->config_vector = ioport__read16(data); 239 if (vec == VIRTIO_MSI_NO_VECTOR) 240 break; 241 242 gsi = irq__add_msix_route(kvm, 243 &vpci->msix_table[vec].msg, 244 vpci->dev_hdr.dev_num << 3); 245 /* 246 * We don't need IRQ routing if we can use 247 * MSI injection via the KVM_SIGNAL_MSI ioctl. 248 */ 249 if (gsi == -ENXIO && 250 vpci->features & VIRTIO_PCI_F_SIGNAL_MSI) 251 break; 252 253 if (gsi < 0) { 254 die("failed to configure MSIs"); 255 break; 256 } 257 258 vpci->config_gsi = gsi; 259 break; 260 case VIRTIO_MSI_QUEUE_VECTOR: 261 vec = ioport__read16(data); 262 vpci->vq_vector[vpci->queue_selector] = vec; 263 264 if (vec == VIRTIO_MSI_NO_VECTOR) 265 break; 266 267 gsi = irq__add_msix_route(kvm, 268 &vpci->msix_table[vec].msg, 269 vpci->dev_hdr.dev_num << 3); 270 /* 271 * We don't need IRQ routing if we can use 272 * MSI injection via the KVM_SIGNAL_MSI ioctl. 273 */ 274 if (gsi == -ENXIO && 275 vpci->features & VIRTIO_PCI_F_SIGNAL_MSI) 276 break; 277 278 if (gsi < 0) { 279 die("failed to configure MSIs"); 280 break; 281 } 282 283 vpci->gsis[vpci->queue_selector] = gsi; 284 if (vdev->ops->notify_vq_gsi) 285 vdev->ops->notify_vq_gsi(kvm, vpci->dev, 286 vpci->queue_selector, 287 gsi); 288 break; 289 }; 290 291 return true; 292 } else if (type == VIRTIO_PCI_O_CONFIG) { 293 size_t config_size; 294 295 config_size = vdev->ops->get_config_size(kvm, vpci->dev); 296 if (config_offset + size > config_size) { 297 /* Access goes beyond the config size, so return failure. */ 298 WARN_ONCE(1, "Config access offset (%u) is beyond config size (%zu)\n", 299 config_offset, config_size); 300 return false; 301 } 302 303 /* TODO: Handle access lengths beyond one byte */ 304 if (size != 1) { 305 WARN_ONCE(1, "Size (%u) not supported\n", size); 306 return false; 307 } 308 vdev->ops->get_config(kvm, vpci->dev)[config_offset] = *(u8 *)data; 309 310 return true; 311 } 312 313 return false; 314 } 315 316 static bool virtio_pci__data_out(struct kvm_cpu *vcpu, struct virtio_device *vdev, 317 unsigned long offset, void *data, u32 size) 318 { 319 bool ret = true; 320 struct virtio_pci *vpci; 321 struct kvm *kvm; 322 u32 val; 323 324 kvm = vcpu->kvm; 325 vpci = vdev->virtio; 326 327 switch (offset) { 328 case VIRTIO_PCI_GUEST_FEATURES: 329 val = ioport__read32(data); 330 virtio_set_guest_features(kvm, vdev, vpci->dev, val); 331 break; 332 case VIRTIO_PCI_QUEUE_PFN: 333 val = ioport__read32(data); 334 if (val) { 335 virtio_pci__init_ioeventfd(kvm, vdev, 336 vpci->queue_selector); 337 vdev->ops->init_vq(kvm, vpci->dev, vpci->queue_selector, 338 1 << VIRTIO_PCI_QUEUE_ADDR_SHIFT, 339 VIRTIO_PCI_VRING_ALIGN, val); 340 } else { 341 virtio_pci_exit_vq(kvm, vdev, vpci->queue_selector); 342 } 343 break; 344 case VIRTIO_PCI_QUEUE_SEL: 345 vpci->queue_selector = ioport__read16(data); 346 break; 347 case VIRTIO_PCI_QUEUE_NOTIFY: 348 val = ioport__read16(data); 349 vdev->ops->notify_vq(kvm, vpci->dev, val); 350 break; 351 case VIRTIO_PCI_STATUS: 352 vpci->status = ioport__read8(data); 353 if (!vpci->status) /* Sample endianness on reset */ 354 vdev->endian = kvm_cpu__get_endianness(vcpu); 355 virtio_notify_status(kvm, vdev, vpci->dev, vpci->status); 356 break; 357 default: 358 ret = virtio_pci__specific_data_out(kvm, vdev, data, size, offset); 359 break; 360 }; 361 362 return ret; 363 } 364 365 static void virtio_pci__msix_mmio_callback(struct kvm_cpu *vcpu, 366 u64 addr, u8 *data, u32 len, 367 u8 is_write, void *ptr) 368 { 369 struct virtio_device *vdev = ptr; 370 struct virtio_pci *vpci = vdev->virtio; 371 struct msix_table *table; 372 u32 msix_io_addr = virtio_pci__msix_io_addr(vpci); 373 u32 pba_offset; 374 int vecnum; 375 size_t offset; 376 377 BUILD_BUG_ON(VIRTIO_NR_MSIX > (sizeof(vpci->msix_pba) * 8)); 378 379 pba_offset = vpci->pci_hdr.msix.pba_offset & ~PCI_MSIX_TABLE_BIR; 380 if (addr >= msix_io_addr + pba_offset) { 381 /* Read access to PBA */ 382 if (is_write) 383 return; 384 offset = addr - (msix_io_addr + pba_offset); 385 if ((offset + len) > sizeof (vpci->msix_pba)) 386 return; 387 memcpy(data, (void *)&vpci->msix_pba + offset, len); 388 return; 389 } 390 391 table = vpci->msix_table; 392 offset = addr - msix_io_addr; 393 394 vecnum = offset / sizeof(struct msix_table); 395 offset = offset % sizeof(struct msix_table); 396 397 if (!is_write) { 398 memcpy(data, (void *)&table[vecnum] + offset, len); 399 return; 400 } 401 402 memcpy((void *)&table[vecnum] + offset, data, len); 403 404 /* Did we just update the address or payload? */ 405 if (offset < offsetof(struct msix_table, ctrl)) 406 update_msix_map(vpci, table, vecnum); 407 } 408 409 static void virtio_pci__signal_msi(struct kvm *kvm, struct virtio_pci *vpci, 410 int vec) 411 { 412 struct kvm_msi msi = { 413 .address_lo = vpci->msix_table[vec].msg.address_lo, 414 .address_hi = vpci->msix_table[vec].msg.address_hi, 415 .data = vpci->msix_table[vec].msg.data, 416 }; 417 418 if (kvm->msix_needs_devid) { 419 msi.flags = KVM_MSI_VALID_DEVID; 420 msi.devid = vpci->dev_hdr.dev_num << 3; 421 } 422 423 irq__signal_msi(kvm, &msi); 424 } 425 426 int virtio_pci__signal_vq(struct kvm *kvm, struct virtio_device *vdev, u32 vq) 427 { 428 struct virtio_pci *vpci = vdev->virtio; 429 int tbl = vpci->vq_vector[vq]; 430 431 if (virtio_pci__msix_enabled(vpci) && tbl != VIRTIO_MSI_NO_VECTOR) { 432 if (vpci->pci_hdr.msix.ctrl & cpu_to_le16(PCI_MSIX_FLAGS_MASKALL) || 433 vpci->msix_table[tbl].ctrl & cpu_to_le16(PCI_MSIX_ENTRY_CTRL_MASKBIT)) { 434 435 vpci->msix_pba |= 1 << tbl; 436 return 0; 437 } 438 439 if (vpci->features & VIRTIO_PCI_F_SIGNAL_MSI) 440 virtio_pci__signal_msi(kvm, vpci, vpci->vq_vector[vq]); 441 else 442 kvm__irq_trigger(kvm, vpci->gsis[vq]); 443 } else { 444 vpci->isr = VIRTIO_IRQ_HIGH; 445 kvm__irq_line(kvm, vpci->legacy_irq_line, VIRTIO_IRQ_HIGH); 446 } 447 return 0; 448 } 449 450 int virtio_pci__signal_config(struct kvm *kvm, struct virtio_device *vdev) 451 { 452 struct virtio_pci *vpci = vdev->virtio; 453 int tbl = vpci->config_vector; 454 455 if (virtio_pci__msix_enabled(vpci) && tbl != VIRTIO_MSI_NO_VECTOR) { 456 if (vpci->pci_hdr.msix.ctrl & cpu_to_le16(PCI_MSIX_FLAGS_MASKALL) || 457 vpci->msix_table[tbl].ctrl & cpu_to_le16(PCI_MSIX_ENTRY_CTRL_MASKBIT)) { 458 459 vpci->msix_pba |= 1 << tbl; 460 return 0; 461 } 462 463 if (vpci->features & VIRTIO_PCI_F_SIGNAL_MSI) 464 virtio_pci__signal_msi(kvm, vpci, tbl); 465 else 466 kvm__irq_trigger(kvm, vpci->config_gsi); 467 } else { 468 vpci->isr = VIRTIO_PCI_ISR_CONFIG; 469 kvm__irq_trigger(kvm, vpci->legacy_irq_line); 470 } 471 472 return 0; 473 } 474 475 static void virtio_pci__io_mmio_callback(struct kvm_cpu *vcpu, 476 u64 addr, u8 *data, u32 len, 477 u8 is_write, void *ptr) 478 { 479 struct virtio_device *vdev = ptr; 480 struct virtio_pci *vpci = vdev->virtio; 481 u32 ioport_addr = virtio_pci__port_addr(vpci); 482 u32 base_addr; 483 484 if (addr >= ioport_addr && 485 addr < ioport_addr + pci__bar_size(&vpci->pci_hdr, 0)) 486 base_addr = ioport_addr; 487 else 488 base_addr = virtio_pci__mmio_addr(vpci); 489 490 if (!is_write) 491 virtio_pci__data_in(vcpu, vdev, addr - base_addr, data, len); 492 else 493 virtio_pci__data_out(vcpu, vdev, addr - base_addr, data, len); 494 } 495 496 static int virtio_pci__bar_activate(struct kvm *kvm, 497 struct pci_device_header *pci_hdr, 498 int bar_num, void *data) 499 { 500 struct virtio_device *vdev = data; 501 u32 bar_addr, bar_size; 502 int r = -EINVAL; 503 504 assert(bar_num <= 2); 505 506 bar_addr = pci__bar_address(pci_hdr, bar_num); 507 bar_size = pci__bar_size(pci_hdr, bar_num); 508 509 switch (bar_num) { 510 case 0: 511 r = kvm__register_pio(kvm, bar_addr, bar_size, 512 virtio_pci__io_mmio_callback, vdev); 513 break; 514 case 1: 515 r = kvm__register_mmio(kvm, bar_addr, bar_size, false, 516 virtio_pci__io_mmio_callback, vdev); 517 break; 518 case 2: 519 r = kvm__register_mmio(kvm, bar_addr, bar_size, false, 520 virtio_pci__msix_mmio_callback, vdev); 521 break; 522 } 523 524 return r; 525 } 526 527 static int virtio_pci__bar_deactivate(struct kvm *kvm, 528 struct pci_device_header *pci_hdr, 529 int bar_num, void *data) 530 { 531 u32 bar_addr; 532 bool success; 533 int r = -EINVAL; 534 535 assert(bar_num <= 2); 536 537 bar_addr = pci__bar_address(pci_hdr, bar_num); 538 539 switch (bar_num) { 540 case 0: 541 r = kvm__deregister_pio(kvm, bar_addr); 542 break; 543 case 1: 544 case 2: 545 success = kvm__deregister_mmio(kvm, bar_addr); 546 /* kvm__deregister_mmio fails when the region is not found. */ 547 r = (success ? 0 : -ENOENT); 548 break; 549 } 550 551 return r; 552 } 553 554 int virtio_pci__init(struct kvm *kvm, void *dev, struct virtio_device *vdev, 555 int device_id, int subsys_id, int class) 556 { 557 struct virtio_pci *vpci = vdev->virtio; 558 u32 mmio_addr, msix_io_block; 559 u16 port_addr; 560 int r; 561 562 vpci->kvm = kvm; 563 vpci->dev = dev; 564 565 BUILD_BUG_ON(!is_power_of_two(PCI_IO_SIZE)); 566 567 port_addr = pci_get_io_port_block(PCI_IO_SIZE); 568 mmio_addr = pci_get_mmio_block(PCI_IO_SIZE); 569 msix_io_block = pci_get_mmio_block(VIRTIO_MSIX_BAR_SIZE); 570 571 vpci->pci_hdr = (struct pci_device_header) { 572 .vendor_id = cpu_to_le16(PCI_VENDOR_ID_REDHAT_QUMRANET), 573 .device_id = cpu_to_le16(device_id), 574 .command = PCI_COMMAND_IO | PCI_COMMAND_MEMORY, 575 .header_type = PCI_HEADER_TYPE_NORMAL, 576 .revision_id = 0, 577 .class[0] = class & 0xff, 578 .class[1] = (class >> 8) & 0xff, 579 .class[2] = (class >> 16) & 0xff, 580 .subsys_vendor_id = cpu_to_le16(PCI_SUBSYSTEM_VENDOR_ID_REDHAT_QUMRANET), 581 .subsys_id = cpu_to_le16(subsys_id), 582 .bar[0] = cpu_to_le32(port_addr 583 | PCI_BASE_ADDRESS_SPACE_IO), 584 .bar[1] = cpu_to_le32(mmio_addr 585 | PCI_BASE_ADDRESS_SPACE_MEMORY), 586 .bar[2] = cpu_to_le32(msix_io_block 587 | PCI_BASE_ADDRESS_SPACE_MEMORY), 588 .status = cpu_to_le16(PCI_STATUS_CAP_LIST), 589 .capabilities = (void *)&vpci->pci_hdr.msix - (void *)&vpci->pci_hdr, 590 .bar_size[0] = cpu_to_le32(PCI_IO_SIZE), 591 .bar_size[1] = cpu_to_le32(PCI_IO_SIZE), 592 .bar_size[2] = cpu_to_le32(VIRTIO_MSIX_BAR_SIZE), 593 }; 594 595 r = pci__register_bar_regions(kvm, &vpci->pci_hdr, 596 virtio_pci__bar_activate, 597 virtio_pci__bar_deactivate, vdev); 598 if (r < 0) 599 return r; 600 601 vpci->dev_hdr = (struct device_header) { 602 .bus_type = DEVICE_BUS_PCI, 603 .data = &vpci->pci_hdr, 604 }; 605 606 vpci->pci_hdr.msix.cap = PCI_CAP_ID_MSIX; 607 vpci->pci_hdr.msix.next = 0; 608 /* 609 * We at most have VIRTIO_NR_MSIX entries (VIRTIO_PCI_MAX_VQ 610 * entries for virt queue, VIRTIO_PCI_MAX_CONFIG entries for 611 * config). 612 * 613 * To quote the PCI spec: 614 * 615 * System software reads this field to determine the 616 * MSI-X Table Size N, which is encoded as N-1. 617 * For example, a returned value of "00000000011" 618 * indicates a table size of 4. 619 */ 620 vpci->pci_hdr.msix.ctrl = cpu_to_le16(VIRTIO_NR_MSIX - 1); 621 622 /* Both table and PBA are mapped to the same BAR (2) */ 623 vpci->pci_hdr.msix.table_offset = cpu_to_le32(2); 624 vpci->pci_hdr.msix.pba_offset = cpu_to_le32(2 | VIRTIO_MSIX_TABLE_SIZE); 625 vpci->config_vector = 0; 626 627 if (irq__can_signal_msi(kvm)) 628 vpci->features |= VIRTIO_PCI_F_SIGNAL_MSI; 629 630 vpci->legacy_irq_line = pci__assign_irq(&vpci->pci_hdr); 631 632 r = device__register(&vpci->dev_hdr); 633 if (r < 0) 634 return r; 635 636 return 0; 637 } 638 639 int virtio_pci__reset(struct kvm *kvm, struct virtio_device *vdev) 640 { 641 int vq; 642 struct virtio_pci *vpci = vdev->virtio; 643 644 for (vq = 0; vq < vdev->ops->get_vq_count(kvm, vpci->dev); vq++) 645 virtio_pci_exit_vq(kvm, vdev, vq); 646 647 return 0; 648 } 649 650 int virtio_pci__exit(struct kvm *kvm, struct virtio_device *vdev) 651 { 652 struct virtio_pci *vpci = vdev->virtio; 653 654 virtio_pci__reset(kvm, vdev); 655 kvm__deregister_mmio(kvm, virtio_pci__mmio_addr(vpci)); 656 kvm__deregister_mmio(kvm, virtio_pci__msix_io_addr(vpci)); 657 kvm__deregister_pio(kvm, virtio_pci__port_addr(vpci)); 658 659 return 0; 660 } 661