1 /* 2 * vfio based device assignment support 3 * 4 * Copyright Red Hat, Inc. 2012 5 * 6 * Authors: 7 * Alex Williamson <alex.williamson@redhat.com> 8 * 9 * This work is licensed under the terms of the GNU GPL, version 2. See 10 * the COPYING file in the top-level directory. 11 * 12 * Based on qemu-kvm device-assignment: 13 * Adapted for KVM by Qumranet. 14 * Copyright (c) 2007, Neocleus, Alex Novik (alex@neocleus.com) 15 * Copyright (c) 2007, Neocleus, Guy Zana (guy@neocleus.com) 16 * Copyright (C) 2008, Qumranet, Amit Shah (amit.shah@qumranet.com) 17 * Copyright (C) 2008, Red Hat, Amit Shah (amit.shah@redhat.com) 18 * Copyright (C) 2008, IBM, Muli Ben-Yehuda (muli@il.ibm.com) 19 */ 20 21 #include "qemu/osdep.h" 22 #include <linux/vfio.h> 23 #include <sys/ioctl.h> 24 25 #include "hw/pci/msi.h" 26 #include "hw/pci/msix.h" 27 #include "hw/pci/pci_bridge.h" 28 #include "qemu/error-report.h" 29 #include "qemu/range.h" 30 #include "sysemu/kvm.h" 31 #include "sysemu/sysemu.h" 32 #include "pci.h" 33 #include "trace.h" 34 35 #define MSIX_CAP_LENGTH 12 36 37 static void vfio_disable_interrupts(VFIOPCIDevice *vdev); 38 static void vfio_mmap_set_enabled(VFIOPCIDevice *vdev, bool enabled); 39 40 /* 41 * Disabling BAR mmaping can be slow, but toggling it around INTx can 42 * also be a huge overhead. We try to get the best of both worlds by 43 * waiting until an interrupt to disable mmaps (subsequent transitions 44 * to the same state are effectively no overhead). If the interrupt has 45 * been serviced and the time gap is long enough, we re-enable mmaps for 46 * performance. This works well for things like graphics cards, which 47 * may not use their interrupt at all and are penalized to an unusable 48 * level by read/write BAR traps. Other devices, like NICs, have more 49 * regular interrupts and see much better latency by staying in non-mmap 50 * mode. We therefore set the default mmap_timeout such that a ping 51 * is just enough to keep the mmap disabled. Users can experiment with 52 * other options with the x-intx-mmap-timeout-ms parameter (a value of 53 * zero disables the timer). 54 */ 55 static void vfio_intx_mmap_enable(void *opaque) 56 { 57 VFIOPCIDevice *vdev = opaque; 58 59 if (vdev->intx.pending) { 60 timer_mod(vdev->intx.mmap_timer, 61 qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + vdev->intx.mmap_timeout); 62 return; 63 } 64 65 vfio_mmap_set_enabled(vdev, true); 66 } 67 68 static void vfio_intx_interrupt(void *opaque) 69 { 70 VFIOPCIDevice *vdev = opaque; 71 72 if (!event_notifier_test_and_clear(&vdev->intx.interrupt)) { 73 return; 74 } 75 76 trace_vfio_intx_interrupt(vdev->vbasedev.name, 'A' + vdev->intx.pin); 77 78 vdev->intx.pending = true; 79 pci_irq_assert(&vdev->pdev); 80 vfio_mmap_set_enabled(vdev, false); 81 if (vdev->intx.mmap_timeout) { 82 timer_mod(vdev->intx.mmap_timer, 83 qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + vdev->intx.mmap_timeout); 84 } 85 } 86 87 static void vfio_intx_eoi(VFIODevice *vbasedev) 88 { 89 VFIOPCIDevice *vdev = container_of(vbasedev, VFIOPCIDevice, vbasedev); 90 91 if (!vdev->intx.pending) { 92 return; 93 } 94 95 trace_vfio_intx_eoi(vbasedev->name); 96 97 vdev->intx.pending = false; 98 pci_irq_deassert(&vdev->pdev); 99 vfio_unmask_single_irqindex(vbasedev, VFIO_PCI_INTX_IRQ_INDEX); 100 } 101 102 static void vfio_intx_enable_kvm(VFIOPCIDevice *vdev) 103 { 104 #ifdef CONFIG_KVM 105 struct kvm_irqfd irqfd = { 106 .fd = event_notifier_get_fd(&vdev->intx.interrupt), 107 .gsi = vdev->intx.route.irq, 108 .flags = KVM_IRQFD_FLAG_RESAMPLE, 109 }; 110 struct vfio_irq_set *irq_set; 111 int ret, argsz; 112 int32_t *pfd; 113 114 if (vdev->no_kvm_intx || !kvm_irqfds_enabled() || 115 vdev->intx.route.mode != PCI_INTX_ENABLED || 116 !kvm_resamplefds_enabled()) { 117 return; 118 } 119 120 /* Get to a known interrupt state */ 121 qemu_set_fd_handler(irqfd.fd, NULL, NULL, vdev); 122 vfio_mask_single_irqindex(&vdev->vbasedev, VFIO_PCI_INTX_IRQ_INDEX); 123 vdev->intx.pending = false; 124 pci_irq_deassert(&vdev->pdev); 125 126 /* Get an eventfd for resample/unmask */ 127 if (event_notifier_init(&vdev->intx.unmask, 0)) { 128 error_report("vfio: Error: event_notifier_init failed eoi"); 129 goto fail; 130 } 131 132 /* KVM triggers it, VFIO listens for it */ 133 irqfd.resamplefd = event_notifier_get_fd(&vdev->intx.unmask); 134 135 if (kvm_vm_ioctl(kvm_state, KVM_IRQFD, &irqfd)) { 136 error_report("vfio: Error: Failed to setup resample irqfd: %m"); 137 goto fail_irqfd; 138 } 139 140 argsz = sizeof(*irq_set) + sizeof(*pfd); 141 142 irq_set = g_malloc0(argsz); 143 irq_set->argsz = argsz; 144 irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_UNMASK; 145 irq_set->index = VFIO_PCI_INTX_IRQ_INDEX; 146 irq_set->start = 0; 147 irq_set->count = 1; 148 pfd = (int32_t *)&irq_set->data; 149 150 *pfd = irqfd.resamplefd; 151 152 ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_SET_IRQS, irq_set); 153 g_free(irq_set); 154 if (ret) { 155 error_report("vfio: Error: Failed to setup INTx unmask fd: %m"); 156 goto fail_vfio; 157 } 158 159 /* Let'em rip */ 160 vfio_unmask_single_irqindex(&vdev->vbasedev, VFIO_PCI_INTX_IRQ_INDEX); 161 162 vdev->intx.kvm_accel = true; 163 164 trace_vfio_intx_enable_kvm(vdev->vbasedev.name); 165 166 return; 167 168 fail_vfio: 169 irqfd.flags = KVM_IRQFD_FLAG_DEASSIGN; 170 kvm_vm_ioctl(kvm_state, KVM_IRQFD, &irqfd); 171 fail_irqfd: 172 event_notifier_cleanup(&vdev->intx.unmask); 173 fail: 174 qemu_set_fd_handler(irqfd.fd, vfio_intx_interrupt, NULL, vdev); 175 vfio_unmask_single_irqindex(&vdev->vbasedev, VFIO_PCI_INTX_IRQ_INDEX); 176 #endif 177 } 178 179 static void vfio_intx_disable_kvm(VFIOPCIDevice *vdev) 180 { 181 #ifdef CONFIG_KVM 182 struct kvm_irqfd irqfd = { 183 .fd = event_notifier_get_fd(&vdev->intx.interrupt), 184 .gsi = vdev->intx.route.irq, 185 .flags = KVM_IRQFD_FLAG_DEASSIGN, 186 }; 187 188 if (!vdev->intx.kvm_accel) { 189 return; 190 } 191 192 /* 193 * Get to a known state, hardware masked, QEMU ready to accept new 194 * interrupts, QEMU IRQ de-asserted. 195 */ 196 vfio_mask_single_irqindex(&vdev->vbasedev, VFIO_PCI_INTX_IRQ_INDEX); 197 vdev->intx.pending = false; 198 pci_irq_deassert(&vdev->pdev); 199 200 /* Tell KVM to stop listening for an INTx irqfd */ 201 if (kvm_vm_ioctl(kvm_state, KVM_IRQFD, &irqfd)) { 202 error_report("vfio: Error: Failed to disable INTx irqfd: %m"); 203 } 204 205 /* We only need to close the eventfd for VFIO to cleanup the kernel side */ 206 event_notifier_cleanup(&vdev->intx.unmask); 207 208 /* QEMU starts listening for interrupt events. */ 209 qemu_set_fd_handler(irqfd.fd, vfio_intx_interrupt, NULL, vdev); 210 211 vdev->intx.kvm_accel = false; 212 213 /* If we've missed an event, let it re-fire through QEMU */ 214 vfio_unmask_single_irqindex(&vdev->vbasedev, VFIO_PCI_INTX_IRQ_INDEX); 215 216 trace_vfio_intx_disable_kvm(vdev->vbasedev.name); 217 #endif 218 } 219 220 static void vfio_intx_update(PCIDevice *pdev) 221 { 222 VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, pdev); 223 PCIINTxRoute route; 224 225 if (vdev->interrupt != VFIO_INT_INTx) { 226 return; 227 } 228 229 route = pci_device_route_intx_to_irq(&vdev->pdev, vdev->intx.pin); 230 231 if (!pci_intx_route_changed(&vdev->intx.route, &route)) { 232 return; /* Nothing changed */ 233 } 234 235 trace_vfio_intx_update(vdev->vbasedev.name, 236 vdev->intx.route.irq, route.irq); 237 238 vfio_intx_disable_kvm(vdev); 239 240 vdev->intx.route = route; 241 242 if (route.mode != PCI_INTX_ENABLED) { 243 return; 244 } 245 246 vfio_intx_enable_kvm(vdev); 247 248 /* Re-enable the interrupt in cased we missed an EOI */ 249 vfio_intx_eoi(&vdev->vbasedev); 250 } 251 252 static int vfio_intx_enable(VFIOPCIDevice *vdev) 253 { 254 uint8_t pin = vfio_pci_read_config(&vdev->pdev, PCI_INTERRUPT_PIN, 1); 255 int ret, argsz; 256 struct vfio_irq_set *irq_set; 257 int32_t *pfd; 258 259 if (!pin) { 260 return 0; 261 } 262 263 vfio_disable_interrupts(vdev); 264 265 vdev->intx.pin = pin - 1; /* Pin A (1) -> irq[0] */ 266 pci_config_set_interrupt_pin(vdev->pdev.config, pin); 267 268 #ifdef CONFIG_KVM 269 /* 270 * Only conditional to avoid generating error messages on platforms 271 * where we won't actually use the result anyway. 272 */ 273 if (kvm_irqfds_enabled() && kvm_resamplefds_enabled()) { 274 vdev->intx.route = pci_device_route_intx_to_irq(&vdev->pdev, 275 vdev->intx.pin); 276 } 277 #endif 278 279 ret = event_notifier_init(&vdev->intx.interrupt, 0); 280 if (ret) { 281 error_report("vfio: Error: event_notifier_init failed"); 282 return ret; 283 } 284 285 argsz = sizeof(*irq_set) + sizeof(*pfd); 286 287 irq_set = g_malloc0(argsz); 288 irq_set->argsz = argsz; 289 irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER; 290 irq_set->index = VFIO_PCI_INTX_IRQ_INDEX; 291 irq_set->start = 0; 292 irq_set->count = 1; 293 pfd = (int32_t *)&irq_set->data; 294 295 *pfd = event_notifier_get_fd(&vdev->intx.interrupt); 296 qemu_set_fd_handler(*pfd, vfio_intx_interrupt, NULL, vdev); 297 298 ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_SET_IRQS, irq_set); 299 g_free(irq_set); 300 if (ret) { 301 error_report("vfio: Error: Failed to setup INTx fd: %m"); 302 qemu_set_fd_handler(*pfd, NULL, NULL, vdev); 303 event_notifier_cleanup(&vdev->intx.interrupt); 304 return -errno; 305 } 306 307 vfio_intx_enable_kvm(vdev); 308 309 vdev->interrupt = VFIO_INT_INTx; 310 311 trace_vfio_intx_enable(vdev->vbasedev.name); 312 313 return 0; 314 } 315 316 static void vfio_intx_disable(VFIOPCIDevice *vdev) 317 { 318 int fd; 319 320 timer_del(vdev->intx.mmap_timer); 321 vfio_intx_disable_kvm(vdev); 322 vfio_disable_irqindex(&vdev->vbasedev, VFIO_PCI_INTX_IRQ_INDEX); 323 vdev->intx.pending = false; 324 pci_irq_deassert(&vdev->pdev); 325 vfio_mmap_set_enabled(vdev, true); 326 327 fd = event_notifier_get_fd(&vdev->intx.interrupt); 328 qemu_set_fd_handler(fd, NULL, NULL, vdev); 329 event_notifier_cleanup(&vdev->intx.interrupt); 330 331 vdev->interrupt = VFIO_INT_NONE; 332 333 trace_vfio_intx_disable(vdev->vbasedev.name); 334 } 335 336 /* 337 * MSI/X 338 */ 339 static void vfio_msi_interrupt(void *opaque) 340 { 341 VFIOMSIVector *vector = opaque; 342 VFIOPCIDevice *vdev = vector->vdev; 343 MSIMessage (*get_msg)(PCIDevice *dev, unsigned vector); 344 void (*notify)(PCIDevice *dev, unsigned vector); 345 MSIMessage msg; 346 int nr = vector - vdev->msi_vectors; 347 348 if (!event_notifier_test_and_clear(&vector->interrupt)) { 349 return; 350 } 351 352 if (vdev->interrupt == VFIO_INT_MSIX) { 353 get_msg = msix_get_message; 354 notify = msix_notify; 355 356 /* A masked vector firing needs to use the PBA, enable it */ 357 if (msix_is_masked(&vdev->pdev, nr)) { 358 set_bit(nr, vdev->msix->pending); 359 memory_region_set_enabled(&vdev->pdev.msix_pba_mmio, true); 360 trace_vfio_msix_pba_enable(vdev->vbasedev.name); 361 } 362 } else if (vdev->interrupt == VFIO_INT_MSI) { 363 get_msg = msi_get_message; 364 notify = msi_notify; 365 } else { 366 abort(); 367 } 368 369 msg = get_msg(&vdev->pdev, nr); 370 trace_vfio_msi_interrupt(vdev->vbasedev.name, nr, msg.address, msg.data); 371 notify(&vdev->pdev, nr); 372 } 373 374 static int vfio_enable_vectors(VFIOPCIDevice *vdev, bool msix) 375 { 376 struct vfio_irq_set *irq_set; 377 int ret = 0, i, argsz; 378 int32_t *fds; 379 380 argsz = sizeof(*irq_set) + (vdev->nr_vectors * sizeof(*fds)); 381 382 irq_set = g_malloc0(argsz); 383 irq_set->argsz = argsz; 384 irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER; 385 irq_set->index = msix ? VFIO_PCI_MSIX_IRQ_INDEX : VFIO_PCI_MSI_IRQ_INDEX; 386 irq_set->start = 0; 387 irq_set->count = vdev->nr_vectors; 388 fds = (int32_t *)&irq_set->data; 389 390 for (i = 0; i < vdev->nr_vectors; i++) { 391 int fd = -1; 392 393 /* 394 * MSI vs MSI-X - The guest has direct access to MSI mask and pending 395 * bits, therefore we always use the KVM signaling path when setup. 396 * MSI-X mask and pending bits are emulated, so we want to use the 397 * KVM signaling path only when configured and unmasked. 398 */ 399 if (vdev->msi_vectors[i].use) { 400 if (vdev->msi_vectors[i].virq < 0 || 401 (msix && msix_is_masked(&vdev->pdev, i))) { 402 fd = event_notifier_get_fd(&vdev->msi_vectors[i].interrupt); 403 } else { 404 fd = event_notifier_get_fd(&vdev->msi_vectors[i].kvm_interrupt); 405 } 406 } 407 408 fds[i] = fd; 409 } 410 411 ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_SET_IRQS, irq_set); 412 413 g_free(irq_set); 414 415 return ret; 416 } 417 418 static void vfio_add_kvm_msi_virq(VFIOPCIDevice *vdev, VFIOMSIVector *vector, 419 MSIMessage *msg, bool msix) 420 { 421 int virq; 422 423 if ((msix && vdev->no_kvm_msix) || (!msix && vdev->no_kvm_msi) || !msg) { 424 return; 425 } 426 427 if (event_notifier_init(&vector->kvm_interrupt, 0)) { 428 return; 429 } 430 431 virq = kvm_irqchip_add_msi_route(kvm_state, *msg, &vdev->pdev); 432 if (virq < 0) { 433 event_notifier_cleanup(&vector->kvm_interrupt); 434 return; 435 } 436 437 if (kvm_irqchip_add_irqfd_notifier_gsi(kvm_state, &vector->kvm_interrupt, 438 NULL, virq) < 0) { 439 kvm_irqchip_release_virq(kvm_state, virq); 440 event_notifier_cleanup(&vector->kvm_interrupt); 441 return; 442 } 443 444 vector->virq = virq; 445 } 446 447 static void vfio_remove_kvm_msi_virq(VFIOMSIVector *vector) 448 { 449 kvm_irqchip_remove_irqfd_notifier_gsi(kvm_state, &vector->kvm_interrupt, 450 vector->virq); 451 kvm_irqchip_release_virq(kvm_state, vector->virq); 452 vector->virq = -1; 453 event_notifier_cleanup(&vector->kvm_interrupt); 454 } 455 456 static void vfio_update_kvm_msi_virq(VFIOMSIVector *vector, MSIMessage msg, 457 PCIDevice *pdev) 458 { 459 kvm_irqchip_update_msi_route(kvm_state, vector->virq, msg, pdev); 460 } 461 462 static int vfio_msix_vector_do_use(PCIDevice *pdev, unsigned int nr, 463 MSIMessage *msg, IOHandler *handler) 464 { 465 VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, pdev); 466 VFIOMSIVector *vector; 467 int ret; 468 469 trace_vfio_msix_vector_do_use(vdev->vbasedev.name, nr); 470 471 vector = &vdev->msi_vectors[nr]; 472 473 if (!vector->use) { 474 vector->vdev = vdev; 475 vector->virq = -1; 476 if (event_notifier_init(&vector->interrupt, 0)) { 477 error_report("vfio: Error: event_notifier_init failed"); 478 } 479 vector->use = true; 480 msix_vector_use(pdev, nr); 481 } 482 483 qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt), 484 handler, NULL, vector); 485 486 /* 487 * Attempt to enable route through KVM irqchip, 488 * default to userspace handling if unavailable. 489 */ 490 if (vector->virq >= 0) { 491 if (!msg) { 492 vfio_remove_kvm_msi_virq(vector); 493 } else { 494 vfio_update_kvm_msi_virq(vector, *msg, pdev); 495 } 496 } else { 497 vfio_add_kvm_msi_virq(vdev, vector, msg, true); 498 } 499 500 /* 501 * We don't want to have the host allocate all possible MSI vectors 502 * for a device if they're not in use, so we shutdown and incrementally 503 * increase them as needed. 504 */ 505 if (vdev->nr_vectors < nr + 1) { 506 vfio_disable_irqindex(&vdev->vbasedev, VFIO_PCI_MSIX_IRQ_INDEX); 507 vdev->nr_vectors = nr + 1; 508 ret = vfio_enable_vectors(vdev, true); 509 if (ret) { 510 error_report("vfio: failed to enable vectors, %d", ret); 511 } 512 } else { 513 int argsz; 514 struct vfio_irq_set *irq_set; 515 int32_t *pfd; 516 517 argsz = sizeof(*irq_set) + sizeof(*pfd); 518 519 irq_set = g_malloc0(argsz); 520 irq_set->argsz = argsz; 521 irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | 522 VFIO_IRQ_SET_ACTION_TRIGGER; 523 irq_set->index = VFIO_PCI_MSIX_IRQ_INDEX; 524 irq_set->start = nr; 525 irq_set->count = 1; 526 pfd = (int32_t *)&irq_set->data; 527 528 if (vector->virq >= 0) { 529 *pfd = event_notifier_get_fd(&vector->kvm_interrupt); 530 } else { 531 *pfd = event_notifier_get_fd(&vector->interrupt); 532 } 533 534 ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_SET_IRQS, irq_set); 535 g_free(irq_set); 536 if (ret) { 537 error_report("vfio: failed to modify vector, %d", ret); 538 } 539 } 540 541 /* Disable PBA emulation when nothing more is pending. */ 542 clear_bit(nr, vdev->msix->pending); 543 if (find_first_bit(vdev->msix->pending, 544 vdev->nr_vectors) == vdev->nr_vectors) { 545 memory_region_set_enabled(&vdev->pdev.msix_pba_mmio, false); 546 trace_vfio_msix_pba_disable(vdev->vbasedev.name); 547 } 548 549 return 0; 550 } 551 552 static int vfio_msix_vector_use(PCIDevice *pdev, 553 unsigned int nr, MSIMessage msg) 554 { 555 return vfio_msix_vector_do_use(pdev, nr, &msg, vfio_msi_interrupt); 556 } 557 558 static void vfio_msix_vector_release(PCIDevice *pdev, unsigned int nr) 559 { 560 VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, pdev); 561 VFIOMSIVector *vector = &vdev->msi_vectors[nr]; 562 563 trace_vfio_msix_vector_release(vdev->vbasedev.name, nr); 564 565 /* 566 * There are still old guests that mask and unmask vectors on every 567 * interrupt. If we're using QEMU bypass with a KVM irqfd, leave all of 568 * the KVM setup in place, simply switch VFIO to use the non-bypass 569 * eventfd. We'll then fire the interrupt through QEMU and the MSI-X 570 * core will mask the interrupt and set pending bits, allowing it to 571 * be re-asserted on unmask. Nothing to do if already using QEMU mode. 572 */ 573 if (vector->virq >= 0) { 574 int argsz; 575 struct vfio_irq_set *irq_set; 576 int32_t *pfd; 577 578 argsz = sizeof(*irq_set) + sizeof(*pfd); 579 580 irq_set = g_malloc0(argsz); 581 irq_set->argsz = argsz; 582 irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | 583 VFIO_IRQ_SET_ACTION_TRIGGER; 584 irq_set->index = VFIO_PCI_MSIX_IRQ_INDEX; 585 irq_set->start = nr; 586 irq_set->count = 1; 587 pfd = (int32_t *)&irq_set->data; 588 589 *pfd = event_notifier_get_fd(&vector->interrupt); 590 591 ioctl(vdev->vbasedev.fd, VFIO_DEVICE_SET_IRQS, irq_set); 592 593 g_free(irq_set); 594 } 595 } 596 597 static void vfio_msix_enable(VFIOPCIDevice *vdev) 598 { 599 vfio_disable_interrupts(vdev); 600 601 vdev->msi_vectors = g_new0(VFIOMSIVector, vdev->msix->entries); 602 603 vdev->interrupt = VFIO_INT_MSIX; 604 605 /* 606 * Some communication channels between VF & PF or PF & fw rely on the 607 * physical state of the device and expect that enabling MSI-X from the 608 * guest enables the same on the host. When our guest is Linux, the 609 * guest driver call to pci_enable_msix() sets the enabling bit in the 610 * MSI-X capability, but leaves the vector table masked. We therefore 611 * can't rely on a vector_use callback (from request_irq() in the guest) 612 * to switch the physical device into MSI-X mode because that may come a 613 * long time after pci_enable_msix(). This code enables vector 0 with 614 * triggering to userspace, then immediately release the vector, leaving 615 * the physical device with no vectors enabled, but MSI-X enabled, just 616 * like the guest view. 617 */ 618 vfio_msix_vector_do_use(&vdev->pdev, 0, NULL, NULL); 619 vfio_msix_vector_release(&vdev->pdev, 0); 620 621 if (msix_set_vector_notifiers(&vdev->pdev, vfio_msix_vector_use, 622 vfio_msix_vector_release, NULL)) { 623 error_report("vfio: msix_set_vector_notifiers failed"); 624 } 625 626 trace_vfio_msix_enable(vdev->vbasedev.name); 627 } 628 629 static void vfio_msi_enable(VFIOPCIDevice *vdev) 630 { 631 int ret, i; 632 633 vfio_disable_interrupts(vdev); 634 635 vdev->nr_vectors = msi_nr_vectors_allocated(&vdev->pdev); 636 retry: 637 vdev->msi_vectors = g_new0(VFIOMSIVector, vdev->nr_vectors); 638 639 for (i = 0; i < vdev->nr_vectors; i++) { 640 VFIOMSIVector *vector = &vdev->msi_vectors[i]; 641 MSIMessage msg = msi_get_message(&vdev->pdev, i); 642 643 vector->vdev = vdev; 644 vector->virq = -1; 645 vector->use = true; 646 647 if (event_notifier_init(&vector->interrupt, 0)) { 648 error_report("vfio: Error: event_notifier_init failed"); 649 } 650 651 qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt), 652 vfio_msi_interrupt, NULL, vector); 653 654 /* 655 * Attempt to enable route through KVM irqchip, 656 * default to userspace handling if unavailable. 657 */ 658 vfio_add_kvm_msi_virq(vdev, vector, &msg, false); 659 } 660 661 /* Set interrupt type prior to possible interrupts */ 662 vdev->interrupt = VFIO_INT_MSI; 663 664 ret = vfio_enable_vectors(vdev, false); 665 if (ret) { 666 if (ret < 0) { 667 error_report("vfio: Error: Failed to setup MSI fds: %m"); 668 } else if (ret != vdev->nr_vectors) { 669 error_report("vfio: Error: Failed to enable %d " 670 "MSI vectors, retry with %d", vdev->nr_vectors, ret); 671 } 672 673 for (i = 0; i < vdev->nr_vectors; i++) { 674 VFIOMSIVector *vector = &vdev->msi_vectors[i]; 675 if (vector->virq >= 0) { 676 vfio_remove_kvm_msi_virq(vector); 677 } 678 qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt), 679 NULL, NULL, NULL); 680 event_notifier_cleanup(&vector->interrupt); 681 } 682 683 g_free(vdev->msi_vectors); 684 685 if (ret > 0 && ret != vdev->nr_vectors) { 686 vdev->nr_vectors = ret; 687 goto retry; 688 } 689 vdev->nr_vectors = 0; 690 691 /* 692 * Failing to setup MSI doesn't really fall within any specification. 693 * Let's try leaving interrupts disabled and hope the guest figures 694 * out to fall back to INTx for this device. 695 */ 696 error_report("vfio: Error: Failed to enable MSI"); 697 vdev->interrupt = VFIO_INT_NONE; 698 699 return; 700 } 701 702 trace_vfio_msi_enable(vdev->vbasedev.name, vdev->nr_vectors); 703 } 704 705 static void vfio_msi_disable_common(VFIOPCIDevice *vdev) 706 { 707 int i; 708 709 for (i = 0; i < vdev->nr_vectors; i++) { 710 VFIOMSIVector *vector = &vdev->msi_vectors[i]; 711 if (vdev->msi_vectors[i].use) { 712 if (vector->virq >= 0) { 713 vfio_remove_kvm_msi_virq(vector); 714 } 715 qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt), 716 NULL, NULL, NULL); 717 event_notifier_cleanup(&vector->interrupt); 718 } 719 } 720 721 g_free(vdev->msi_vectors); 722 vdev->msi_vectors = NULL; 723 vdev->nr_vectors = 0; 724 vdev->interrupt = VFIO_INT_NONE; 725 726 vfio_intx_enable(vdev); 727 } 728 729 static void vfio_msix_disable(VFIOPCIDevice *vdev) 730 { 731 int i; 732 733 msix_unset_vector_notifiers(&vdev->pdev); 734 735 /* 736 * MSI-X will only release vectors if MSI-X is still enabled on the 737 * device, check through the rest and release it ourselves if necessary. 738 */ 739 for (i = 0; i < vdev->nr_vectors; i++) { 740 if (vdev->msi_vectors[i].use) { 741 vfio_msix_vector_release(&vdev->pdev, i); 742 msix_vector_unuse(&vdev->pdev, i); 743 } 744 } 745 746 if (vdev->nr_vectors) { 747 vfio_disable_irqindex(&vdev->vbasedev, VFIO_PCI_MSIX_IRQ_INDEX); 748 } 749 750 vfio_msi_disable_common(vdev); 751 752 memset(vdev->msix->pending, 0, 753 BITS_TO_LONGS(vdev->msix->entries) * sizeof(unsigned long)); 754 755 trace_vfio_msix_disable(vdev->vbasedev.name); 756 } 757 758 static void vfio_msi_disable(VFIOPCIDevice *vdev) 759 { 760 vfio_disable_irqindex(&vdev->vbasedev, VFIO_PCI_MSI_IRQ_INDEX); 761 vfio_msi_disable_common(vdev); 762 763 trace_vfio_msi_disable(vdev->vbasedev.name); 764 } 765 766 static void vfio_update_msi(VFIOPCIDevice *vdev) 767 { 768 int i; 769 770 for (i = 0; i < vdev->nr_vectors; i++) { 771 VFIOMSIVector *vector = &vdev->msi_vectors[i]; 772 MSIMessage msg; 773 774 if (!vector->use || vector->virq < 0) { 775 continue; 776 } 777 778 msg = msi_get_message(&vdev->pdev, i); 779 vfio_update_kvm_msi_virq(vector, msg, &vdev->pdev); 780 } 781 } 782 783 static void vfio_pci_load_rom(VFIOPCIDevice *vdev) 784 { 785 struct vfio_region_info *reg_info; 786 uint64_t size; 787 off_t off = 0; 788 ssize_t bytes; 789 790 if (vfio_get_region_info(&vdev->vbasedev, 791 VFIO_PCI_ROM_REGION_INDEX, ®_info)) { 792 error_report("vfio: Error getting ROM info: %m"); 793 return; 794 } 795 796 trace_vfio_pci_load_rom(vdev->vbasedev.name, (unsigned long)reg_info->size, 797 (unsigned long)reg_info->offset, 798 (unsigned long)reg_info->flags); 799 800 vdev->rom_size = size = reg_info->size; 801 vdev->rom_offset = reg_info->offset; 802 803 g_free(reg_info); 804 805 if (!vdev->rom_size) { 806 vdev->rom_read_failed = true; 807 error_report("vfio-pci: Cannot read device rom at " 808 "%s", vdev->vbasedev.name); 809 error_printf("Device option ROM contents are probably invalid " 810 "(check dmesg).\nSkip option ROM probe with rombar=0, " 811 "or load from file with romfile=\n"); 812 return; 813 } 814 815 vdev->rom = g_malloc(size); 816 memset(vdev->rom, 0xff, size); 817 818 while (size) { 819 bytes = pread(vdev->vbasedev.fd, vdev->rom + off, 820 size, vdev->rom_offset + off); 821 if (bytes == 0) { 822 break; 823 } else if (bytes > 0) { 824 off += bytes; 825 size -= bytes; 826 } else { 827 if (errno == EINTR || errno == EAGAIN) { 828 continue; 829 } 830 error_report("vfio: Error reading device ROM: %m"); 831 break; 832 } 833 } 834 835 /* 836 * Test the ROM signature against our device, if the vendor is correct 837 * but the device ID doesn't match, store the correct device ID and 838 * recompute the checksum. Intel IGD devices need this and are known 839 * to have bogus checksums so we can't simply adjust the checksum. 840 */ 841 if (pci_get_word(vdev->rom) == 0xaa55 && 842 pci_get_word(vdev->rom + 0x18) + 8 < vdev->rom_size && 843 !memcmp(vdev->rom + pci_get_word(vdev->rom + 0x18), "PCIR", 4)) { 844 uint16_t vid, did; 845 846 vid = pci_get_word(vdev->rom + pci_get_word(vdev->rom + 0x18) + 4); 847 did = pci_get_word(vdev->rom + pci_get_word(vdev->rom + 0x18) + 6); 848 849 if (vid == vdev->vendor_id && did != vdev->device_id) { 850 int i; 851 uint8_t csum, *data = vdev->rom; 852 853 pci_set_word(vdev->rom + pci_get_word(vdev->rom + 0x18) + 6, 854 vdev->device_id); 855 data[6] = 0; 856 857 for (csum = 0, i = 0; i < vdev->rom_size; i++) { 858 csum += data[i]; 859 } 860 861 data[6] = -csum; 862 } 863 } 864 } 865 866 static uint64_t vfio_rom_read(void *opaque, hwaddr addr, unsigned size) 867 { 868 VFIOPCIDevice *vdev = opaque; 869 union { 870 uint8_t byte; 871 uint16_t word; 872 uint32_t dword; 873 uint64_t qword; 874 } val; 875 uint64_t data = 0; 876 877 /* Load the ROM lazily when the guest tries to read it */ 878 if (unlikely(!vdev->rom && !vdev->rom_read_failed)) { 879 vfio_pci_load_rom(vdev); 880 } 881 882 memcpy(&val, vdev->rom + addr, 883 (addr < vdev->rom_size) ? MIN(size, vdev->rom_size - addr) : 0); 884 885 switch (size) { 886 case 1: 887 data = val.byte; 888 break; 889 case 2: 890 data = le16_to_cpu(val.word); 891 break; 892 case 4: 893 data = le32_to_cpu(val.dword); 894 break; 895 default: 896 hw_error("vfio: unsupported read size, %d bytes\n", size); 897 break; 898 } 899 900 trace_vfio_rom_read(vdev->vbasedev.name, addr, size, data); 901 902 return data; 903 } 904 905 static void vfio_rom_write(void *opaque, hwaddr addr, 906 uint64_t data, unsigned size) 907 { 908 } 909 910 static const MemoryRegionOps vfio_rom_ops = { 911 .read = vfio_rom_read, 912 .write = vfio_rom_write, 913 .endianness = DEVICE_LITTLE_ENDIAN, 914 }; 915 916 static void vfio_pci_size_rom(VFIOPCIDevice *vdev) 917 { 918 uint32_t orig, size = cpu_to_le32((uint32_t)PCI_ROM_ADDRESS_MASK); 919 off_t offset = vdev->config_offset + PCI_ROM_ADDRESS; 920 DeviceState *dev = DEVICE(vdev); 921 char *name; 922 int fd = vdev->vbasedev.fd; 923 924 if (vdev->pdev.romfile || !vdev->pdev.rom_bar) { 925 /* Since pci handles romfile, just print a message and return */ 926 if (vfio_blacklist_opt_rom(vdev) && vdev->pdev.romfile) { 927 error_printf("Warning : Device at %s is known to cause system instability issues during option rom execution. Proceeding anyway since user specified romfile\n", 928 vdev->vbasedev.name); 929 } 930 return; 931 } 932 933 /* 934 * Use the same size ROM BAR as the physical device. The contents 935 * will get filled in later when the guest tries to read it. 936 */ 937 if (pread(fd, &orig, 4, offset) != 4 || 938 pwrite(fd, &size, 4, offset) != 4 || 939 pread(fd, &size, 4, offset) != 4 || 940 pwrite(fd, &orig, 4, offset) != 4) { 941 error_report("%s(%s) failed: %m", __func__, vdev->vbasedev.name); 942 return; 943 } 944 945 size = ~(le32_to_cpu(size) & PCI_ROM_ADDRESS_MASK) + 1; 946 947 if (!size) { 948 return; 949 } 950 951 if (vfio_blacklist_opt_rom(vdev)) { 952 if (dev->opts && qemu_opt_get(dev->opts, "rombar")) { 953 error_printf("Warning : Device at %s is known to cause system instability issues during option rom execution. Proceeding anyway since user specified non zero value for rombar\n", 954 vdev->vbasedev.name); 955 } else { 956 error_printf("Warning : Rom loading for device at %s has been disabled due to system instability issues. Specify rombar=1 or romfile to force\n", 957 vdev->vbasedev.name); 958 return; 959 } 960 } 961 962 trace_vfio_pci_size_rom(vdev->vbasedev.name, size); 963 964 name = g_strdup_printf("vfio[%s].rom", vdev->vbasedev.name); 965 966 memory_region_init_io(&vdev->pdev.rom, OBJECT(vdev), 967 &vfio_rom_ops, vdev, name, size); 968 g_free(name); 969 970 pci_register_bar(&vdev->pdev, PCI_ROM_SLOT, 971 PCI_BASE_ADDRESS_SPACE_MEMORY, &vdev->pdev.rom); 972 973 vdev->pdev.has_rom = true; 974 vdev->rom_read_failed = false; 975 } 976 977 void vfio_vga_write(void *opaque, hwaddr addr, 978 uint64_t data, unsigned size) 979 { 980 VFIOVGARegion *region = opaque; 981 VFIOVGA *vga = container_of(region, VFIOVGA, region[region->nr]); 982 union { 983 uint8_t byte; 984 uint16_t word; 985 uint32_t dword; 986 uint64_t qword; 987 } buf; 988 off_t offset = vga->fd_offset + region->offset + addr; 989 990 switch (size) { 991 case 1: 992 buf.byte = data; 993 break; 994 case 2: 995 buf.word = cpu_to_le16(data); 996 break; 997 case 4: 998 buf.dword = cpu_to_le32(data); 999 break; 1000 default: 1001 hw_error("vfio: unsupported write size, %d bytes", size); 1002 break; 1003 } 1004 1005 if (pwrite(vga->fd, &buf, size, offset) != size) { 1006 error_report("%s(,0x%"HWADDR_PRIx", 0x%"PRIx64", %d) failed: %m", 1007 __func__, region->offset + addr, data, size); 1008 } 1009 1010 trace_vfio_vga_write(region->offset + addr, data, size); 1011 } 1012 1013 uint64_t vfio_vga_read(void *opaque, hwaddr addr, unsigned size) 1014 { 1015 VFIOVGARegion *region = opaque; 1016 VFIOVGA *vga = container_of(region, VFIOVGA, region[region->nr]); 1017 union { 1018 uint8_t byte; 1019 uint16_t word; 1020 uint32_t dword; 1021 uint64_t qword; 1022 } buf; 1023 uint64_t data = 0; 1024 off_t offset = vga->fd_offset + region->offset + addr; 1025 1026 if (pread(vga->fd, &buf, size, offset) != size) { 1027 error_report("%s(,0x%"HWADDR_PRIx", %d) failed: %m", 1028 __func__, region->offset + addr, size); 1029 return (uint64_t)-1; 1030 } 1031 1032 switch (size) { 1033 case 1: 1034 data = buf.byte; 1035 break; 1036 case 2: 1037 data = le16_to_cpu(buf.word); 1038 break; 1039 case 4: 1040 data = le32_to_cpu(buf.dword); 1041 break; 1042 default: 1043 hw_error("vfio: unsupported read size, %d bytes", size); 1044 break; 1045 } 1046 1047 trace_vfio_vga_read(region->offset + addr, size, data); 1048 1049 return data; 1050 } 1051 1052 static const MemoryRegionOps vfio_vga_ops = { 1053 .read = vfio_vga_read, 1054 .write = vfio_vga_write, 1055 .endianness = DEVICE_LITTLE_ENDIAN, 1056 }; 1057 1058 /* 1059 * PCI config space 1060 */ 1061 uint32_t vfio_pci_read_config(PCIDevice *pdev, uint32_t addr, int len) 1062 { 1063 VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, pdev); 1064 uint32_t emu_bits = 0, emu_val = 0, phys_val = 0, val; 1065 1066 memcpy(&emu_bits, vdev->emulated_config_bits + addr, len); 1067 emu_bits = le32_to_cpu(emu_bits); 1068 1069 if (emu_bits) { 1070 emu_val = pci_default_read_config(pdev, addr, len); 1071 } 1072 1073 if (~emu_bits & (0xffffffffU >> (32 - len * 8))) { 1074 ssize_t ret; 1075 1076 ret = pread(vdev->vbasedev.fd, &phys_val, len, 1077 vdev->config_offset + addr); 1078 if (ret != len) { 1079 error_report("%s(%s, 0x%x, 0x%x) failed: %m", 1080 __func__, vdev->vbasedev.name, addr, len); 1081 return -errno; 1082 } 1083 phys_val = le32_to_cpu(phys_val); 1084 } 1085 1086 val = (emu_val & emu_bits) | (phys_val & ~emu_bits); 1087 1088 trace_vfio_pci_read_config(vdev->vbasedev.name, addr, len, val); 1089 1090 return val; 1091 } 1092 1093 void vfio_pci_write_config(PCIDevice *pdev, 1094 uint32_t addr, uint32_t val, int len) 1095 { 1096 VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, pdev); 1097 uint32_t val_le = cpu_to_le32(val); 1098 1099 trace_vfio_pci_write_config(vdev->vbasedev.name, addr, val, len); 1100 1101 /* Write everything to VFIO, let it filter out what we can't write */ 1102 if (pwrite(vdev->vbasedev.fd, &val_le, len, vdev->config_offset + addr) 1103 != len) { 1104 error_report("%s(%s, 0x%x, 0x%x, 0x%x) failed: %m", 1105 __func__, vdev->vbasedev.name, addr, val, len); 1106 } 1107 1108 /* MSI/MSI-X Enabling/Disabling */ 1109 if (pdev->cap_present & QEMU_PCI_CAP_MSI && 1110 ranges_overlap(addr, len, pdev->msi_cap, vdev->msi_cap_size)) { 1111 int is_enabled, was_enabled = msi_enabled(pdev); 1112 1113 pci_default_write_config(pdev, addr, val, len); 1114 1115 is_enabled = msi_enabled(pdev); 1116 1117 if (!was_enabled) { 1118 if (is_enabled) { 1119 vfio_msi_enable(vdev); 1120 } 1121 } else { 1122 if (!is_enabled) { 1123 vfio_msi_disable(vdev); 1124 } else { 1125 vfio_update_msi(vdev); 1126 } 1127 } 1128 } else if (pdev->cap_present & QEMU_PCI_CAP_MSIX && 1129 ranges_overlap(addr, len, pdev->msix_cap, MSIX_CAP_LENGTH)) { 1130 int is_enabled, was_enabled = msix_enabled(pdev); 1131 1132 pci_default_write_config(pdev, addr, val, len); 1133 1134 is_enabled = msix_enabled(pdev); 1135 1136 if (!was_enabled && is_enabled) { 1137 vfio_msix_enable(vdev); 1138 } else if (was_enabled && !is_enabled) { 1139 vfio_msix_disable(vdev); 1140 } 1141 } else { 1142 /* Write everything to QEMU to keep emulated bits correct */ 1143 pci_default_write_config(pdev, addr, val, len); 1144 } 1145 } 1146 1147 /* 1148 * Interrupt setup 1149 */ 1150 static void vfio_disable_interrupts(VFIOPCIDevice *vdev) 1151 { 1152 /* 1153 * More complicated than it looks. Disabling MSI/X transitions the 1154 * device to INTx mode (if supported). Therefore we need to first 1155 * disable MSI/X and then cleanup by disabling INTx. 1156 */ 1157 if (vdev->interrupt == VFIO_INT_MSIX) { 1158 vfio_msix_disable(vdev); 1159 } else if (vdev->interrupt == VFIO_INT_MSI) { 1160 vfio_msi_disable(vdev); 1161 } 1162 1163 if (vdev->interrupt == VFIO_INT_INTx) { 1164 vfio_intx_disable(vdev); 1165 } 1166 } 1167 1168 static int vfio_msi_setup(VFIOPCIDevice *vdev, int pos) 1169 { 1170 uint16_t ctrl; 1171 bool msi_64bit, msi_maskbit; 1172 int ret, entries; 1173 1174 if (pread(vdev->vbasedev.fd, &ctrl, sizeof(ctrl), 1175 vdev->config_offset + pos + PCI_CAP_FLAGS) != sizeof(ctrl)) { 1176 return -errno; 1177 } 1178 ctrl = le16_to_cpu(ctrl); 1179 1180 msi_64bit = !!(ctrl & PCI_MSI_FLAGS_64BIT); 1181 msi_maskbit = !!(ctrl & PCI_MSI_FLAGS_MASKBIT); 1182 entries = 1 << ((ctrl & PCI_MSI_FLAGS_QMASK) >> 1); 1183 1184 trace_vfio_msi_setup(vdev->vbasedev.name, pos); 1185 1186 ret = msi_init(&vdev->pdev, pos, entries, msi_64bit, msi_maskbit); 1187 if (ret < 0) { 1188 if (ret == -ENOTSUP) { 1189 return 0; 1190 } 1191 error_report("vfio: msi_init failed"); 1192 return ret; 1193 } 1194 vdev->msi_cap_size = 0xa + (msi_maskbit ? 0xa : 0) + (msi_64bit ? 0x4 : 0); 1195 1196 return 0; 1197 } 1198 1199 static void vfio_pci_fixup_msix_region(VFIOPCIDevice *vdev) 1200 { 1201 off_t start, end; 1202 VFIORegion *region = &vdev->bars[vdev->msix->table_bar].region; 1203 1204 /* 1205 * We expect to find a single mmap covering the whole BAR, anything else 1206 * means it's either unsupported or already setup. 1207 */ 1208 if (region->nr_mmaps != 1 || region->mmaps[0].offset || 1209 region->size != region->mmaps[0].size) { 1210 return; 1211 } 1212 1213 /* MSI-X table start and end aligned to host page size */ 1214 start = vdev->msix->table_offset & qemu_real_host_page_mask; 1215 end = REAL_HOST_PAGE_ALIGN((uint64_t)vdev->msix->table_offset + 1216 (vdev->msix->entries * PCI_MSIX_ENTRY_SIZE)); 1217 1218 /* 1219 * Does the MSI-X table cover the beginning of the BAR? The whole BAR? 1220 * NB - Host page size is necessarily a power of two and so is the PCI 1221 * BAR (not counting EA yet), therefore if we have host page aligned 1222 * @start and @end, then any remainder of the BAR before or after those 1223 * must be at least host page sized and therefore mmap'able. 1224 */ 1225 if (!start) { 1226 if (end >= region->size) { 1227 region->nr_mmaps = 0; 1228 g_free(region->mmaps); 1229 region->mmaps = NULL; 1230 trace_vfio_msix_fixup(vdev->vbasedev.name, 1231 vdev->msix->table_bar, 0, 0); 1232 } else { 1233 region->mmaps[0].offset = end; 1234 region->mmaps[0].size = region->size - end; 1235 trace_vfio_msix_fixup(vdev->vbasedev.name, 1236 vdev->msix->table_bar, region->mmaps[0].offset, 1237 region->mmaps[0].offset + region->mmaps[0].size); 1238 } 1239 1240 /* Maybe it's aligned at the end of the BAR */ 1241 } else if (end >= region->size) { 1242 region->mmaps[0].size = start; 1243 trace_vfio_msix_fixup(vdev->vbasedev.name, 1244 vdev->msix->table_bar, region->mmaps[0].offset, 1245 region->mmaps[0].offset + region->mmaps[0].size); 1246 1247 /* Otherwise it must split the BAR */ 1248 } else { 1249 region->nr_mmaps = 2; 1250 region->mmaps = g_renew(VFIOMmap, region->mmaps, 2); 1251 1252 memcpy(®ion->mmaps[1], ®ion->mmaps[0], sizeof(VFIOMmap)); 1253 1254 region->mmaps[0].size = start; 1255 trace_vfio_msix_fixup(vdev->vbasedev.name, 1256 vdev->msix->table_bar, region->mmaps[0].offset, 1257 region->mmaps[0].offset + region->mmaps[0].size); 1258 1259 region->mmaps[1].offset = end; 1260 region->mmaps[1].size = region->size - end; 1261 trace_vfio_msix_fixup(vdev->vbasedev.name, 1262 vdev->msix->table_bar, region->mmaps[1].offset, 1263 region->mmaps[1].offset + region->mmaps[1].size); 1264 } 1265 } 1266 1267 /* 1268 * We don't have any control over how pci_add_capability() inserts 1269 * capabilities into the chain. In order to setup MSI-X we need a 1270 * MemoryRegion for the BAR. In order to setup the BAR and not 1271 * attempt to mmap the MSI-X table area, which VFIO won't allow, we 1272 * need to first look for where the MSI-X table lives. So we 1273 * unfortunately split MSI-X setup across two functions. 1274 */ 1275 static int vfio_msix_early_setup(VFIOPCIDevice *vdev) 1276 { 1277 uint8_t pos; 1278 uint16_t ctrl; 1279 uint32_t table, pba; 1280 int fd = vdev->vbasedev.fd; 1281 VFIOMSIXInfo *msix; 1282 1283 pos = pci_find_capability(&vdev->pdev, PCI_CAP_ID_MSIX); 1284 if (!pos) { 1285 return 0; 1286 } 1287 1288 if (pread(fd, &ctrl, sizeof(ctrl), 1289 vdev->config_offset + pos + PCI_MSIX_FLAGS) != sizeof(ctrl)) { 1290 return -errno; 1291 } 1292 1293 if (pread(fd, &table, sizeof(table), 1294 vdev->config_offset + pos + PCI_MSIX_TABLE) != sizeof(table)) { 1295 return -errno; 1296 } 1297 1298 if (pread(fd, &pba, sizeof(pba), 1299 vdev->config_offset + pos + PCI_MSIX_PBA) != sizeof(pba)) { 1300 return -errno; 1301 } 1302 1303 ctrl = le16_to_cpu(ctrl); 1304 table = le32_to_cpu(table); 1305 pba = le32_to_cpu(pba); 1306 1307 msix = g_malloc0(sizeof(*msix)); 1308 msix->table_bar = table & PCI_MSIX_FLAGS_BIRMASK; 1309 msix->table_offset = table & ~PCI_MSIX_FLAGS_BIRMASK; 1310 msix->pba_bar = pba & PCI_MSIX_FLAGS_BIRMASK; 1311 msix->pba_offset = pba & ~PCI_MSIX_FLAGS_BIRMASK; 1312 msix->entries = (ctrl & PCI_MSIX_FLAGS_QSIZE) + 1; 1313 1314 /* 1315 * Test the size of the pba_offset variable and catch if it extends outside 1316 * of the specified BAR. If it is the case, we need to apply a hardware 1317 * specific quirk if the device is known or we have a broken configuration. 1318 */ 1319 if (msix->pba_offset >= vdev->bars[msix->pba_bar].region.size) { 1320 /* 1321 * Chelsio T5 Virtual Function devices are encoded as 0x58xx for T5 1322 * adapters. The T5 hardware returns an incorrect value of 0x8000 for 1323 * the VF PBA offset while the BAR itself is only 8k. The correct value 1324 * is 0x1000, so we hard code that here. 1325 */ 1326 if (vdev->vendor_id == PCI_VENDOR_ID_CHELSIO && 1327 (vdev->device_id & 0xff00) == 0x5800) { 1328 msix->pba_offset = 0x1000; 1329 } else { 1330 error_report("vfio: Hardware reports invalid configuration, " 1331 "MSIX PBA outside of specified BAR"); 1332 g_free(msix); 1333 return -EINVAL; 1334 } 1335 } 1336 1337 trace_vfio_msix_early_setup(vdev->vbasedev.name, pos, msix->table_bar, 1338 msix->table_offset, msix->entries); 1339 vdev->msix = msix; 1340 1341 vfio_pci_fixup_msix_region(vdev); 1342 1343 return 0; 1344 } 1345 1346 static int vfio_msix_setup(VFIOPCIDevice *vdev, int pos) 1347 { 1348 int ret; 1349 1350 vdev->msix->pending = g_malloc0(BITS_TO_LONGS(vdev->msix->entries) * 1351 sizeof(unsigned long)); 1352 ret = msix_init(&vdev->pdev, vdev->msix->entries, 1353 vdev->bars[vdev->msix->table_bar].region.mem, 1354 vdev->msix->table_bar, vdev->msix->table_offset, 1355 vdev->bars[vdev->msix->pba_bar].region.mem, 1356 vdev->msix->pba_bar, vdev->msix->pba_offset, pos); 1357 if (ret < 0) { 1358 if (ret == -ENOTSUP) { 1359 return 0; 1360 } 1361 error_report("vfio: msix_init failed"); 1362 return ret; 1363 } 1364 1365 /* 1366 * The PCI spec suggests that devices provide additional alignment for 1367 * MSI-X structures and avoid overlapping non-MSI-X related registers. 1368 * For an assigned device, this hopefully means that emulation of MSI-X 1369 * structures does not affect the performance of the device. If devices 1370 * fail to provide that alignment, a significant performance penalty may 1371 * result, for instance Mellanox MT27500 VFs: 1372 * http://www.spinics.net/lists/kvm/msg125881.html 1373 * 1374 * The PBA is simply not that important for such a serious regression and 1375 * most drivers do not appear to look at it. The solution for this is to 1376 * disable the PBA MemoryRegion unless it's being used. We disable it 1377 * here and only enable it if a masked vector fires through QEMU. As the 1378 * vector-use notifier is called, which occurs on unmask, we test whether 1379 * PBA emulation is needed and again disable if not. 1380 */ 1381 memory_region_set_enabled(&vdev->pdev.msix_pba_mmio, false); 1382 1383 return 0; 1384 } 1385 1386 static void vfio_teardown_msi(VFIOPCIDevice *vdev) 1387 { 1388 msi_uninit(&vdev->pdev); 1389 1390 if (vdev->msix) { 1391 msix_uninit(&vdev->pdev, 1392 vdev->bars[vdev->msix->table_bar].region.mem, 1393 vdev->bars[vdev->msix->pba_bar].region.mem); 1394 g_free(vdev->msix->pending); 1395 } 1396 } 1397 1398 /* 1399 * Resource setup 1400 */ 1401 static void vfio_mmap_set_enabled(VFIOPCIDevice *vdev, bool enabled) 1402 { 1403 int i; 1404 1405 for (i = 0; i < PCI_ROM_SLOT; i++) { 1406 vfio_region_mmaps_set_enabled(&vdev->bars[i].region, enabled); 1407 } 1408 } 1409 1410 static void vfio_bar_setup(VFIOPCIDevice *vdev, int nr) 1411 { 1412 VFIOBAR *bar = &vdev->bars[nr]; 1413 1414 uint32_t pci_bar; 1415 uint8_t type; 1416 int ret; 1417 1418 /* Skip both unimplemented BARs and the upper half of 64bit BARS. */ 1419 if (!bar->region.size) { 1420 return; 1421 } 1422 1423 /* Determine what type of BAR this is for registration */ 1424 ret = pread(vdev->vbasedev.fd, &pci_bar, sizeof(pci_bar), 1425 vdev->config_offset + PCI_BASE_ADDRESS_0 + (4 * nr)); 1426 if (ret != sizeof(pci_bar)) { 1427 error_report("vfio: Failed to read BAR %d (%m)", nr); 1428 return; 1429 } 1430 1431 pci_bar = le32_to_cpu(pci_bar); 1432 bar->ioport = (pci_bar & PCI_BASE_ADDRESS_SPACE_IO); 1433 bar->mem64 = bar->ioport ? 0 : (pci_bar & PCI_BASE_ADDRESS_MEM_TYPE_64); 1434 type = pci_bar & (bar->ioport ? ~PCI_BASE_ADDRESS_IO_MASK : 1435 ~PCI_BASE_ADDRESS_MEM_MASK); 1436 1437 if (vfio_region_mmap(&bar->region)) { 1438 error_report("Failed to mmap %s BAR %d. Performance may be slow", 1439 vdev->vbasedev.name, nr); 1440 } 1441 1442 pci_register_bar(&vdev->pdev, nr, type, bar->region.mem); 1443 } 1444 1445 static void vfio_bars_setup(VFIOPCIDevice *vdev) 1446 { 1447 int i; 1448 1449 for (i = 0; i < PCI_ROM_SLOT; i++) { 1450 vfio_bar_setup(vdev, i); 1451 } 1452 } 1453 1454 static void vfio_bars_exit(VFIOPCIDevice *vdev) 1455 { 1456 int i; 1457 1458 for (i = 0; i < PCI_ROM_SLOT; i++) { 1459 vfio_bar_quirk_exit(vdev, i); 1460 vfio_region_exit(&vdev->bars[i].region); 1461 } 1462 1463 if (vdev->vga) { 1464 pci_unregister_vga(&vdev->pdev); 1465 vfio_vga_quirk_exit(vdev); 1466 } 1467 } 1468 1469 static void vfio_bars_finalize(VFIOPCIDevice *vdev) 1470 { 1471 int i; 1472 1473 for (i = 0; i < PCI_ROM_SLOT; i++) { 1474 vfio_bar_quirk_finalize(vdev, i); 1475 vfio_region_finalize(&vdev->bars[i].region); 1476 } 1477 1478 if (vdev->vga) { 1479 vfio_vga_quirk_finalize(vdev); 1480 for (i = 0; i < ARRAY_SIZE(vdev->vga->region); i++) { 1481 object_unparent(OBJECT(&vdev->vga->region[i].mem)); 1482 } 1483 g_free(vdev->vga); 1484 } 1485 } 1486 1487 /* 1488 * General setup 1489 */ 1490 static uint8_t vfio_std_cap_max_size(PCIDevice *pdev, uint8_t pos) 1491 { 1492 uint8_t tmp; 1493 uint16_t next = PCI_CONFIG_SPACE_SIZE; 1494 1495 for (tmp = pdev->config[PCI_CAPABILITY_LIST]; tmp; 1496 tmp = pdev->config[tmp + PCI_CAP_LIST_NEXT]) { 1497 if (tmp > pos && tmp < next) { 1498 next = tmp; 1499 } 1500 } 1501 1502 return next - pos; 1503 } 1504 1505 static void vfio_set_word_bits(uint8_t *buf, uint16_t val, uint16_t mask) 1506 { 1507 pci_set_word(buf, (pci_get_word(buf) & ~mask) | val); 1508 } 1509 1510 static void vfio_add_emulated_word(VFIOPCIDevice *vdev, int pos, 1511 uint16_t val, uint16_t mask) 1512 { 1513 vfio_set_word_bits(vdev->pdev.config + pos, val, mask); 1514 vfio_set_word_bits(vdev->pdev.wmask + pos, ~mask, mask); 1515 vfio_set_word_bits(vdev->emulated_config_bits + pos, mask, mask); 1516 } 1517 1518 static void vfio_set_long_bits(uint8_t *buf, uint32_t val, uint32_t mask) 1519 { 1520 pci_set_long(buf, (pci_get_long(buf) & ~mask) | val); 1521 } 1522 1523 static void vfio_add_emulated_long(VFIOPCIDevice *vdev, int pos, 1524 uint32_t val, uint32_t mask) 1525 { 1526 vfio_set_long_bits(vdev->pdev.config + pos, val, mask); 1527 vfio_set_long_bits(vdev->pdev.wmask + pos, ~mask, mask); 1528 vfio_set_long_bits(vdev->emulated_config_bits + pos, mask, mask); 1529 } 1530 1531 static int vfio_setup_pcie_cap(VFIOPCIDevice *vdev, int pos, uint8_t size) 1532 { 1533 uint16_t flags; 1534 uint8_t type; 1535 1536 flags = pci_get_word(vdev->pdev.config + pos + PCI_CAP_FLAGS); 1537 type = (flags & PCI_EXP_FLAGS_TYPE) >> 4; 1538 1539 if (type != PCI_EXP_TYPE_ENDPOINT && 1540 type != PCI_EXP_TYPE_LEG_END && 1541 type != PCI_EXP_TYPE_RC_END) { 1542 1543 error_report("vfio: Assignment of PCIe type 0x%x " 1544 "devices is not currently supported", type); 1545 return -EINVAL; 1546 } 1547 1548 if (!pci_bus_is_express(vdev->pdev.bus)) { 1549 PCIBus *bus = vdev->pdev.bus; 1550 PCIDevice *bridge; 1551 1552 /* 1553 * Traditionally PCI device assignment exposes the PCIe capability 1554 * as-is on non-express buses. The reason being that some drivers 1555 * simply assume that it's there, for example tg3. However when 1556 * we're running on a native PCIe machine type, like Q35, we need 1557 * to hide the PCIe capability. The reason for this is twofold; 1558 * first Windows guests get a Code 10 error when the PCIe capability 1559 * is exposed in this configuration. Therefore express devices won't 1560 * work at all unless they're attached to express buses in the VM. 1561 * Second, a native PCIe machine introduces the possibility of fine 1562 * granularity IOMMUs supporting both translation and isolation. 1563 * Guest code to discover the IOMMU visibility of a device, such as 1564 * IOMMU grouping code on Linux, is very aware of device types and 1565 * valid transitions between bus types. An express device on a non- 1566 * express bus is not a valid combination on bare metal systems. 1567 * 1568 * Drivers that require a PCIe capability to make the device 1569 * functional are simply going to need to have their devices placed 1570 * on a PCIe bus in the VM. 1571 */ 1572 while (!pci_bus_is_root(bus)) { 1573 bridge = pci_bridge_get_device(bus); 1574 bus = bridge->bus; 1575 } 1576 1577 if (pci_bus_is_express(bus)) { 1578 return 0; 1579 } 1580 1581 } else if (pci_bus_is_root(vdev->pdev.bus)) { 1582 /* 1583 * On a Root Complex bus Endpoints become Root Complex Integrated 1584 * Endpoints, which changes the type and clears the LNK & LNK2 fields. 1585 */ 1586 if (type == PCI_EXP_TYPE_ENDPOINT) { 1587 vfio_add_emulated_word(vdev, pos + PCI_CAP_FLAGS, 1588 PCI_EXP_TYPE_RC_END << 4, 1589 PCI_EXP_FLAGS_TYPE); 1590 1591 /* Link Capabilities, Status, and Control goes away */ 1592 if (size > PCI_EXP_LNKCTL) { 1593 vfio_add_emulated_long(vdev, pos + PCI_EXP_LNKCAP, 0, ~0); 1594 vfio_add_emulated_word(vdev, pos + PCI_EXP_LNKCTL, 0, ~0); 1595 vfio_add_emulated_word(vdev, pos + PCI_EXP_LNKSTA, 0, ~0); 1596 1597 #ifndef PCI_EXP_LNKCAP2 1598 #define PCI_EXP_LNKCAP2 44 1599 #endif 1600 #ifndef PCI_EXP_LNKSTA2 1601 #define PCI_EXP_LNKSTA2 50 1602 #endif 1603 /* Link 2 Capabilities, Status, and Control goes away */ 1604 if (size > PCI_EXP_LNKCAP2) { 1605 vfio_add_emulated_long(vdev, pos + PCI_EXP_LNKCAP2, 0, ~0); 1606 vfio_add_emulated_word(vdev, pos + PCI_EXP_LNKCTL2, 0, ~0); 1607 vfio_add_emulated_word(vdev, pos + PCI_EXP_LNKSTA2, 0, ~0); 1608 } 1609 } 1610 1611 } else if (type == PCI_EXP_TYPE_LEG_END) { 1612 /* 1613 * Legacy endpoints don't belong on the root complex. Windows 1614 * seems to be happier with devices if we skip the capability. 1615 */ 1616 return 0; 1617 } 1618 1619 } else { 1620 /* 1621 * Convert Root Complex Integrated Endpoints to regular endpoints. 1622 * These devices don't support LNK/LNK2 capabilities, so make them up. 1623 */ 1624 if (type == PCI_EXP_TYPE_RC_END) { 1625 vfio_add_emulated_word(vdev, pos + PCI_CAP_FLAGS, 1626 PCI_EXP_TYPE_ENDPOINT << 4, 1627 PCI_EXP_FLAGS_TYPE); 1628 vfio_add_emulated_long(vdev, pos + PCI_EXP_LNKCAP, 1629 PCI_EXP_LNK_MLW_1 | PCI_EXP_LNK_LS_25, ~0); 1630 vfio_add_emulated_word(vdev, pos + PCI_EXP_LNKCTL, 0, ~0); 1631 } 1632 1633 /* Mark the Link Status bits as emulated to allow virtual negotiation */ 1634 vfio_add_emulated_word(vdev, pos + PCI_EXP_LNKSTA, 1635 pci_get_word(vdev->pdev.config + pos + 1636 PCI_EXP_LNKSTA), 1637 PCI_EXP_LNKCAP_MLW | PCI_EXP_LNKCAP_SLS); 1638 } 1639 1640 pos = pci_add_capability(&vdev->pdev, PCI_CAP_ID_EXP, pos, size); 1641 if (pos >= 0) { 1642 vdev->pdev.exp.exp_cap = pos; 1643 } 1644 1645 return pos; 1646 } 1647 1648 static void vfio_check_pcie_flr(VFIOPCIDevice *vdev, uint8_t pos) 1649 { 1650 uint32_t cap = pci_get_long(vdev->pdev.config + pos + PCI_EXP_DEVCAP); 1651 1652 if (cap & PCI_EXP_DEVCAP_FLR) { 1653 trace_vfio_check_pcie_flr(vdev->vbasedev.name); 1654 vdev->has_flr = true; 1655 } 1656 } 1657 1658 static void vfio_check_pm_reset(VFIOPCIDevice *vdev, uint8_t pos) 1659 { 1660 uint16_t csr = pci_get_word(vdev->pdev.config + pos + PCI_PM_CTRL); 1661 1662 if (!(csr & PCI_PM_CTRL_NO_SOFT_RESET)) { 1663 trace_vfio_check_pm_reset(vdev->vbasedev.name); 1664 vdev->has_pm_reset = true; 1665 } 1666 } 1667 1668 static void vfio_check_af_flr(VFIOPCIDevice *vdev, uint8_t pos) 1669 { 1670 uint8_t cap = pci_get_byte(vdev->pdev.config + pos + PCI_AF_CAP); 1671 1672 if ((cap & PCI_AF_CAP_TP) && (cap & PCI_AF_CAP_FLR)) { 1673 trace_vfio_check_af_flr(vdev->vbasedev.name); 1674 vdev->has_flr = true; 1675 } 1676 } 1677 1678 static int vfio_add_std_cap(VFIOPCIDevice *vdev, uint8_t pos) 1679 { 1680 PCIDevice *pdev = &vdev->pdev; 1681 uint8_t cap_id, next, size; 1682 int ret; 1683 1684 cap_id = pdev->config[pos]; 1685 next = pdev->config[pos + PCI_CAP_LIST_NEXT]; 1686 1687 /* 1688 * If it becomes important to configure capabilities to their actual 1689 * size, use this as the default when it's something we don't recognize. 1690 * Since QEMU doesn't actually handle many of the config accesses, 1691 * exact size doesn't seem worthwhile. 1692 */ 1693 size = vfio_std_cap_max_size(pdev, pos); 1694 1695 /* 1696 * pci_add_capability always inserts the new capability at the head 1697 * of the chain. Therefore to end up with a chain that matches the 1698 * physical device, we insert from the end by making this recursive. 1699 * This is also why we pre-calculate size above as cached config space 1700 * will be changed as we unwind the stack. 1701 */ 1702 if (next) { 1703 ret = vfio_add_std_cap(vdev, next); 1704 if (ret) { 1705 return ret; 1706 } 1707 } else { 1708 /* Begin the rebuild, use QEMU emulated list bits */ 1709 pdev->config[PCI_CAPABILITY_LIST] = 0; 1710 vdev->emulated_config_bits[PCI_CAPABILITY_LIST] = 0xff; 1711 vdev->emulated_config_bits[PCI_STATUS] |= PCI_STATUS_CAP_LIST; 1712 } 1713 1714 /* Use emulated next pointer to allow dropping caps */ 1715 pci_set_byte(vdev->emulated_config_bits + pos + PCI_CAP_LIST_NEXT, 0xff); 1716 1717 switch (cap_id) { 1718 case PCI_CAP_ID_MSI: 1719 ret = vfio_msi_setup(vdev, pos); 1720 break; 1721 case PCI_CAP_ID_EXP: 1722 vfio_check_pcie_flr(vdev, pos); 1723 ret = vfio_setup_pcie_cap(vdev, pos, size); 1724 break; 1725 case PCI_CAP_ID_MSIX: 1726 ret = vfio_msix_setup(vdev, pos); 1727 break; 1728 case PCI_CAP_ID_PM: 1729 vfio_check_pm_reset(vdev, pos); 1730 vdev->pm_cap = pos; 1731 ret = pci_add_capability(pdev, cap_id, pos, size); 1732 break; 1733 case PCI_CAP_ID_AF: 1734 vfio_check_af_flr(vdev, pos); 1735 ret = pci_add_capability(pdev, cap_id, pos, size); 1736 break; 1737 default: 1738 ret = pci_add_capability(pdev, cap_id, pos, size); 1739 break; 1740 } 1741 1742 if (ret < 0) { 1743 error_report("vfio: %s Error adding PCI capability " 1744 "0x%x[0x%x]@0x%x: %d", vdev->vbasedev.name, 1745 cap_id, size, pos, ret); 1746 return ret; 1747 } 1748 1749 return 0; 1750 } 1751 1752 static int vfio_add_capabilities(VFIOPCIDevice *vdev) 1753 { 1754 PCIDevice *pdev = &vdev->pdev; 1755 1756 if (!(pdev->config[PCI_STATUS] & PCI_STATUS_CAP_LIST) || 1757 !pdev->config[PCI_CAPABILITY_LIST]) { 1758 return 0; /* Nothing to add */ 1759 } 1760 1761 return vfio_add_std_cap(vdev, pdev->config[PCI_CAPABILITY_LIST]); 1762 } 1763 1764 static void vfio_pci_pre_reset(VFIOPCIDevice *vdev) 1765 { 1766 PCIDevice *pdev = &vdev->pdev; 1767 uint16_t cmd; 1768 1769 vfio_disable_interrupts(vdev); 1770 1771 /* Make sure the device is in D0 */ 1772 if (vdev->pm_cap) { 1773 uint16_t pmcsr; 1774 uint8_t state; 1775 1776 pmcsr = vfio_pci_read_config(pdev, vdev->pm_cap + PCI_PM_CTRL, 2); 1777 state = pmcsr & PCI_PM_CTRL_STATE_MASK; 1778 if (state) { 1779 pmcsr &= ~PCI_PM_CTRL_STATE_MASK; 1780 vfio_pci_write_config(pdev, vdev->pm_cap + PCI_PM_CTRL, pmcsr, 2); 1781 /* vfio handles the necessary delay here */ 1782 pmcsr = vfio_pci_read_config(pdev, vdev->pm_cap + PCI_PM_CTRL, 2); 1783 state = pmcsr & PCI_PM_CTRL_STATE_MASK; 1784 if (state) { 1785 error_report("vfio: Unable to power on device, stuck in D%d", 1786 state); 1787 } 1788 } 1789 } 1790 1791 /* 1792 * Stop any ongoing DMA by disconecting I/O, MMIO, and bus master. 1793 * Also put INTx Disable in known state. 1794 */ 1795 cmd = vfio_pci_read_config(pdev, PCI_COMMAND, 2); 1796 cmd &= ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | 1797 PCI_COMMAND_INTX_DISABLE); 1798 vfio_pci_write_config(pdev, PCI_COMMAND, cmd, 2); 1799 } 1800 1801 static void vfio_pci_post_reset(VFIOPCIDevice *vdev) 1802 { 1803 vfio_intx_enable(vdev); 1804 } 1805 1806 static bool vfio_pci_host_match(PCIHostDeviceAddress *addr, const char *name) 1807 { 1808 char tmp[13]; 1809 1810 sprintf(tmp, "%04x:%02x:%02x.%1x", addr->domain, 1811 addr->bus, addr->slot, addr->function); 1812 1813 return (strcmp(tmp, name) == 0); 1814 } 1815 1816 static int vfio_pci_hot_reset(VFIOPCIDevice *vdev, bool single) 1817 { 1818 VFIOGroup *group; 1819 struct vfio_pci_hot_reset_info *info; 1820 struct vfio_pci_dependent_device *devices; 1821 struct vfio_pci_hot_reset *reset; 1822 int32_t *fds; 1823 int ret, i, count; 1824 bool multi = false; 1825 1826 trace_vfio_pci_hot_reset(vdev->vbasedev.name, single ? "one" : "multi"); 1827 1828 vfio_pci_pre_reset(vdev); 1829 vdev->vbasedev.needs_reset = false; 1830 1831 info = g_malloc0(sizeof(*info)); 1832 info->argsz = sizeof(*info); 1833 1834 ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_GET_PCI_HOT_RESET_INFO, info); 1835 if (ret && errno != ENOSPC) { 1836 ret = -errno; 1837 if (!vdev->has_pm_reset) { 1838 error_report("vfio: Cannot reset device %s, " 1839 "no available reset mechanism.", vdev->vbasedev.name); 1840 } 1841 goto out_single; 1842 } 1843 1844 count = info->count; 1845 info = g_realloc(info, sizeof(*info) + (count * sizeof(*devices))); 1846 info->argsz = sizeof(*info) + (count * sizeof(*devices)); 1847 devices = &info->devices[0]; 1848 1849 ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_GET_PCI_HOT_RESET_INFO, info); 1850 if (ret) { 1851 ret = -errno; 1852 error_report("vfio: hot reset info failed: %m"); 1853 goto out_single; 1854 } 1855 1856 trace_vfio_pci_hot_reset_has_dep_devices(vdev->vbasedev.name); 1857 1858 /* Verify that we have all the groups required */ 1859 for (i = 0; i < info->count; i++) { 1860 PCIHostDeviceAddress host; 1861 VFIOPCIDevice *tmp; 1862 VFIODevice *vbasedev_iter; 1863 1864 host.domain = devices[i].segment; 1865 host.bus = devices[i].bus; 1866 host.slot = PCI_SLOT(devices[i].devfn); 1867 host.function = PCI_FUNC(devices[i].devfn); 1868 1869 trace_vfio_pci_hot_reset_dep_devices(host.domain, 1870 host.bus, host.slot, host.function, devices[i].group_id); 1871 1872 if (vfio_pci_host_match(&host, vdev->vbasedev.name)) { 1873 continue; 1874 } 1875 1876 QLIST_FOREACH(group, &vfio_group_list, next) { 1877 if (group->groupid == devices[i].group_id) { 1878 break; 1879 } 1880 } 1881 1882 if (!group) { 1883 if (!vdev->has_pm_reset) { 1884 error_report("vfio: Cannot reset device %s, " 1885 "depends on group %d which is not owned.", 1886 vdev->vbasedev.name, devices[i].group_id); 1887 } 1888 ret = -EPERM; 1889 goto out; 1890 } 1891 1892 /* Prep dependent devices for reset and clear our marker. */ 1893 QLIST_FOREACH(vbasedev_iter, &group->device_list, next) { 1894 if (vbasedev_iter->type != VFIO_DEVICE_TYPE_PCI) { 1895 continue; 1896 } 1897 tmp = container_of(vbasedev_iter, VFIOPCIDevice, vbasedev); 1898 if (vfio_pci_host_match(&host, tmp->vbasedev.name)) { 1899 if (single) { 1900 ret = -EINVAL; 1901 goto out_single; 1902 } 1903 vfio_pci_pre_reset(tmp); 1904 tmp->vbasedev.needs_reset = false; 1905 multi = true; 1906 break; 1907 } 1908 } 1909 } 1910 1911 if (!single && !multi) { 1912 ret = -EINVAL; 1913 goto out_single; 1914 } 1915 1916 /* Determine how many group fds need to be passed */ 1917 count = 0; 1918 QLIST_FOREACH(group, &vfio_group_list, next) { 1919 for (i = 0; i < info->count; i++) { 1920 if (group->groupid == devices[i].group_id) { 1921 count++; 1922 break; 1923 } 1924 } 1925 } 1926 1927 reset = g_malloc0(sizeof(*reset) + (count * sizeof(*fds))); 1928 reset->argsz = sizeof(*reset) + (count * sizeof(*fds)); 1929 fds = &reset->group_fds[0]; 1930 1931 /* Fill in group fds */ 1932 QLIST_FOREACH(group, &vfio_group_list, next) { 1933 for (i = 0; i < info->count; i++) { 1934 if (group->groupid == devices[i].group_id) { 1935 fds[reset->count++] = group->fd; 1936 break; 1937 } 1938 } 1939 } 1940 1941 /* Bus reset! */ 1942 ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_PCI_HOT_RESET, reset); 1943 g_free(reset); 1944 1945 trace_vfio_pci_hot_reset_result(vdev->vbasedev.name, 1946 ret ? "%m" : "Success"); 1947 1948 out: 1949 /* Re-enable INTx on affected devices */ 1950 for (i = 0; i < info->count; i++) { 1951 PCIHostDeviceAddress host; 1952 VFIOPCIDevice *tmp; 1953 VFIODevice *vbasedev_iter; 1954 1955 host.domain = devices[i].segment; 1956 host.bus = devices[i].bus; 1957 host.slot = PCI_SLOT(devices[i].devfn); 1958 host.function = PCI_FUNC(devices[i].devfn); 1959 1960 if (vfio_pci_host_match(&host, vdev->vbasedev.name)) { 1961 continue; 1962 } 1963 1964 QLIST_FOREACH(group, &vfio_group_list, next) { 1965 if (group->groupid == devices[i].group_id) { 1966 break; 1967 } 1968 } 1969 1970 if (!group) { 1971 break; 1972 } 1973 1974 QLIST_FOREACH(vbasedev_iter, &group->device_list, next) { 1975 if (vbasedev_iter->type != VFIO_DEVICE_TYPE_PCI) { 1976 continue; 1977 } 1978 tmp = container_of(vbasedev_iter, VFIOPCIDevice, vbasedev); 1979 if (vfio_pci_host_match(&host, tmp->vbasedev.name)) { 1980 vfio_pci_post_reset(tmp); 1981 break; 1982 } 1983 } 1984 } 1985 out_single: 1986 vfio_pci_post_reset(vdev); 1987 g_free(info); 1988 1989 return ret; 1990 } 1991 1992 /* 1993 * We want to differentiate hot reset of mulitple in-use devices vs hot reset 1994 * of a single in-use device. VFIO_DEVICE_RESET will already handle the case 1995 * of doing hot resets when there is only a single device per bus. The in-use 1996 * here refers to how many VFIODevices are affected. A hot reset that affects 1997 * multiple devices, but only a single in-use device, means that we can call 1998 * it from our bus ->reset() callback since the extent is effectively a single 1999 * device. This allows us to make use of it in the hotplug path. When there 2000 * are multiple in-use devices, we can only trigger the hot reset during a 2001 * system reset and thus from our reset handler. We separate _one vs _multi 2002 * here so that we don't overlap and do a double reset on the system reset 2003 * path where both our reset handler and ->reset() callback are used. Calling 2004 * _one() will only do a hot reset for the one in-use devices case, calling 2005 * _multi() will do nothing if a _one() would have been sufficient. 2006 */ 2007 static int vfio_pci_hot_reset_one(VFIOPCIDevice *vdev) 2008 { 2009 return vfio_pci_hot_reset(vdev, true); 2010 } 2011 2012 static int vfio_pci_hot_reset_multi(VFIODevice *vbasedev) 2013 { 2014 VFIOPCIDevice *vdev = container_of(vbasedev, VFIOPCIDevice, vbasedev); 2015 return vfio_pci_hot_reset(vdev, false); 2016 } 2017 2018 static void vfio_pci_compute_needs_reset(VFIODevice *vbasedev) 2019 { 2020 VFIOPCIDevice *vdev = container_of(vbasedev, VFIOPCIDevice, vbasedev); 2021 if (!vbasedev->reset_works || (!vdev->has_flr && vdev->has_pm_reset)) { 2022 vbasedev->needs_reset = true; 2023 } 2024 } 2025 2026 static VFIODeviceOps vfio_pci_ops = { 2027 .vfio_compute_needs_reset = vfio_pci_compute_needs_reset, 2028 .vfio_hot_reset_multi = vfio_pci_hot_reset_multi, 2029 .vfio_eoi = vfio_intx_eoi, 2030 }; 2031 2032 int vfio_populate_vga(VFIOPCIDevice *vdev) 2033 { 2034 VFIODevice *vbasedev = &vdev->vbasedev; 2035 struct vfio_region_info *reg_info; 2036 int ret; 2037 2038 ret = vfio_get_region_info(vbasedev, VFIO_PCI_VGA_REGION_INDEX, ®_info); 2039 if (ret) { 2040 return ret; 2041 } 2042 2043 if (!(reg_info->flags & VFIO_REGION_INFO_FLAG_READ) || 2044 !(reg_info->flags & VFIO_REGION_INFO_FLAG_WRITE) || 2045 reg_info->size < 0xbffff + 1) { 2046 error_report("vfio: Unexpected VGA info, flags 0x%lx, size 0x%lx", 2047 (unsigned long)reg_info->flags, 2048 (unsigned long)reg_info->size); 2049 g_free(reg_info); 2050 return -EINVAL; 2051 } 2052 2053 vdev->vga = g_new0(VFIOVGA, 1); 2054 2055 vdev->vga->fd_offset = reg_info->offset; 2056 vdev->vga->fd = vdev->vbasedev.fd; 2057 2058 g_free(reg_info); 2059 2060 vdev->vga->region[QEMU_PCI_VGA_MEM].offset = QEMU_PCI_VGA_MEM_BASE; 2061 vdev->vga->region[QEMU_PCI_VGA_MEM].nr = QEMU_PCI_VGA_MEM; 2062 QLIST_INIT(&vdev->vga->region[QEMU_PCI_VGA_MEM].quirks); 2063 2064 memory_region_init_io(&vdev->vga->region[QEMU_PCI_VGA_MEM].mem, 2065 OBJECT(vdev), &vfio_vga_ops, 2066 &vdev->vga->region[QEMU_PCI_VGA_MEM], 2067 "vfio-vga-mmio@0xa0000", 2068 QEMU_PCI_VGA_MEM_SIZE); 2069 2070 vdev->vga->region[QEMU_PCI_VGA_IO_LO].offset = QEMU_PCI_VGA_IO_LO_BASE; 2071 vdev->vga->region[QEMU_PCI_VGA_IO_LO].nr = QEMU_PCI_VGA_IO_LO; 2072 QLIST_INIT(&vdev->vga->region[QEMU_PCI_VGA_IO_LO].quirks); 2073 2074 memory_region_init_io(&vdev->vga->region[QEMU_PCI_VGA_IO_LO].mem, 2075 OBJECT(vdev), &vfio_vga_ops, 2076 &vdev->vga->region[QEMU_PCI_VGA_IO_LO], 2077 "vfio-vga-io@0x3b0", 2078 QEMU_PCI_VGA_IO_LO_SIZE); 2079 2080 vdev->vga->region[QEMU_PCI_VGA_IO_HI].offset = QEMU_PCI_VGA_IO_HI_BASE; 2081 vdev->vga->region[QEMU_PCI_VGA_IO_HI].nr = QEMU_PCI_VGA_IO_HI; 2082 QLIST_INIT(&vdev->vga->region[QEMU_PCI_VGA_IO_HI].quirks); 2083 2084 memory_region_init_io(&vdev->vga->region[QEMU_PCI_VGA_IO_HI].mem, 2085 OBJECT(vdev), &vfio_vga_ops, 2086 &vdev->vga->region[QEMU_PCI_VGA_IO_HI], 2087 "vfio-vga-io@0x3c0", 2088 QEMU_PCI_VGA_IO_HI_SIZE); 2089 2090 pci_register_vga(&vdev->pdev, &vdev->vga->region[QEMU_PCI_VGA_MEM].mem, 2091 &vdev->vga->region[QEMU_PCI_VGA_IO_LO].mem, 2092 &vdev->vga->region[QEMU_PCI_VGA_IO_HI].mem); 2093 2094 return 0; 2095 } 2096 2097 static int vfio_populate_device(VFIOPCIDevice *vdev) 2098 { 2099 VFIODevice *vbasedev = &vdev->vbasedev; 2100 struct vfio_region_info *reg_info; 2101 struct vfio_irq_info irq_info = { .argsz = sizeof(irq_info) }; 2102 int i, ret = -1; 2103 2104 /* Sanity check device */ 2105 if (!(vbasedev->flags & VFIO_DEVICE_FLAGS_PCI)) { 2106 error_report("vfio: Um, this isn't a PCI device"); 2107 goto error; 2108 } 2109 2110 if (vbasedev->num_regions < VFIO_PCI_CONFIG_REGION_INDEX + 1) { 2111 error_report("vfio: unexpected number of io regions %u", 2112 vbasedev->num_regions); 2113 goto error; 2114 } 2115 2116 if (vbasedev->num_irqs < VFIO_PCI_MSIX_IRQ_INDEX + 1) { 2117 error_report("vfio: unexpected number of irqs %u", vbasedev->num_irqs); 2118 goto error; 2119 } 2120 2121 for (i = VFIO_PCI_BAR0_REGION_INDEX; i < VFIO_PCI_ROM_REGION_INDEX; i++) { 2122 char *name = g_strdup_printf("%s BAR %d", vbasedev->name, i); 2123 2124 ret = vfio_region_setup(OBJECT(vdev), vbasedev, 2125 &vdev->bars[i].region, i, name); 2126 g_free(name); 2127 2128 if (ret) { 2129 error_report("vfio: Error getting region %d info: %m", i); 2130 goto error; 2131 } 2132 2133 QLIST_INIT(&vdev->bars[i].quirks); 2134 } 2135 2136 ret = vfio_get_region_info(vbasedev, 2137 VFIO_PCI_CONFIG_REGION_INDEX, ®_info); 2138 if (ret) { 2139 error_report("vfio: Error getting config info: %m"); 2140 goto error; 2141 } 2142 2143 trace_vfio_populate_device_config(vdev->vbasedev.name, 2144 (unsigned long)reg_info->size, 2145 (unsigned long)reg_info->offset, 2146 (unsigned long)reg_info->flags); 2147 2148 vdev->config_size = reg_info->size; 2149 if (vdev->config_size == PCI_CONFIG_SPACE_SIZE) { 2150 vdev->pdev.cap_present &= ~QEMU_PCI_CAP_EXPRESS; 2151 } 2152 vdev->config_offset = reg_info->offset; 2153 2154 g_free(reg_info); 2155 2156 if (vdev->features & VFIO_FEATURE_ENABLE_VGA) { 2157 ret = vfio_populate_vga(vdev); 2158 if (ret) { 2159 error_report( 2160 "vfio: Device does not support requested feature x-vga"); 2161 goto error; 2162 } 2163 } 2164 2165 irq_info.index = VFIO_PCI_ERR_IRQ_INDEX; 2166 2167 ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_GET_IRQ_INFO, &irq_info); 2168 if (ret) { 2169 /* This can fail for an old kernel or legacy PCI dev */ 2170 trace_vfio_populate_device_get_irq_info_failure(); 2171 ret = 0; 2172 } else if (irq_info.count == 1) { 2173 vdev->pci_aer = true; 2174 } else { 2175 error_report("vfio: %s " 2176 "Could not enable error recovery for the device", 2177 vbasedev->name); 2178 } 2179 2180 error: 2181 return ret; 2182 } 2183 2184 static void vfio_put_device(VFIOPCIDevice *vdev) 2185 { 2186 g_free(vdev->vbasedev.name); 2187 g_free(vdev->msix); 2188 2189 vfio_put_base_device(&vdev->vbasedev); 2190 } 2191 2192 static void vfio_err_notifier_handler(void *opaque) 2193 { 2194 VFIOPCIDevice *vdev = opaque; 2195 2196 if (!event_notifier_test_and_clear(&vdev->err_notifier)) { 2197 return; 2198 } 2199 2200 /* 2201 * TBD. Retrieve the error details and decide what action 2202 * needs to be taken. One of the actions could be to pass 2203 * the error to the guest and have the guest driver recover 2204 * from the error. This requires that PCIe capabilities be 2205 * exposed to the guest. For now, we just terminate the 2206 * guest to contain the error. 2207 */ 2208 2209 error_report("%s(%s) Unrecoverable error detected. Please collect any data possible and then kill the guest", __func__, vdev->vbasedev.name); 2210 2211 vm_stop(RUN_STATE_INTERNAL_ERROR); 2212 } 2213 2214 /* 2215 * Registers error notifier for devices supporting error recovery. 2216 * If we encounter a failure in this function, we report an error 2217 * and continue after disabling error recovery support for the 2218 * device. 2219 */ 2220 static void vfio_register_err_notifier(VFIOPCIDevice *vdev) 2221 { 2222 int ret; 2223 int argsz; 2224 struct vfio_irq_set *irq_set; 2225 int32_t *pfd; 2226 2227 if (!vdev->pci_aer) { 2228 return; 2229 } 2230 2231 if (event_notifier_init(&vdev->err_notifier, 0)) { 2232 error_report("vfio: Unable to init event notifier for error detection"); 2233 vdev->pci_aer = false; 2234 return; 2235 } 2236 2237 argsz = sizeof(*irq_set) + sizeof(*pfd); 2238 2239 irq_set = g_malloc0(argsz); 2240 irq_set->argsz = argsz; 2241 irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | 2242 VFIO_IRQ_SET_ACTION_TRIGGER; 2243 irq_set->index = VFIO_PCI_ERR_IRQ_INDEX; 2244 irq_set->start = 0; 2245 irq_set->count = 1; 2246 pfd = (int32_t *)&irq_set->data; 2247 2248 *pfd = event_notifier_get_fd(&vdev->err_notifier); 2249 qemu_set_fd_handler(*pfd, vfio_err_notifier_handler, NULL, vdev); 2250 2251 ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_SET_IRQS, irq_set); 2252 if (ret) { 2253 error_report("vfio: Failed to set up error notification"); 2254 qemu_set_fd_handler(*pfd, NULL, NULL, vdev); 2255 event_notifier_cleanup(&vdev->err_notifier); 2256 vdev->pci_aer = false; 2257 } 2258 g_free(irq_set); 2259 } 2260 2261 static void vfio_unregister_err_notifier(VFIOPCIDevice *vdev) 2262 { 2263 int argsz; 2264 struct vfio_irq_set *irq_set; 2265 int32_t *pfd; 2266 int ret; 2267 2268 if (!vdev->pci_aer) { 2269 return; 2270 } 2271 2272 argsz = sizeof(*irq_set) + sizeof(*pfd); 2273 2274 irq_set = g_malloc0(argsz); 2275 irq_set->argsz = argsz; 2276 irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | 2277 VFIO_IRQ_SET_ACTION_TRIGGER; 2278 irq_set->index = VFIO_PCI_ERR_IRQ_INDEX; 2279 irq_set->start = 0; 2280 irq_set->count = 1; 2281 pfd = (int32_t *)&irq_set->data; 2282 *pfd = -1; 2283 2284 ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_SET_IRQS, irq_set); 2285 if (ret) { 2286 error_report("vfio: Failed to de-assign error fd: %m"); 2287 } 2288 g_free(irq_set); 2289 qemu_set_fd_handler(event_notifier_get_fd(&vdev->err_notifier), 2290 NULL, NULL, vdev); 2291 event_notifier_cleanup(&vdev->err_notifier); 2292 } 2293 2294 static void vfio_req_notifier_handler(void *opaque) 2295 { 2296 VFIOPCIDevice *vdev = opaque; 2297 2298 if (!event_notifier_test_and_clear(&vdev->req_notifier)) { 2299 return; 2300 } 2301 2302 qdev_unplug(&vdev->pdev.qdev, NULL); 2303 } 2304 2305 static void vfio_register_req_notifier(VFIOPCIDevice *vdev) 2306 { 2307 struct vfio_irq_info irq_info = { .argsz = sizeof(irq_info), 2308 .index = VFIO_PCI_REQ_IRQ_INDEX }; 2309 int argsz; 2310 struct vfio_irq_set *irq_set; 2311 int32_t *pfd; 2312 2313 if (!(vdev->features & VFIO_FEATURE_ENABLE_REQ)) { 2314 return; 2315 } 2316 2317 if (ioctl(vdev->vbasedev.fd, 2318 VFIO_DEVICE_GET_IRQ_INFO, &irq_info) < 0 || irq_info.count < 1) { 2319 return; 2320 } 2321 2322 if (event_notifier_init(&vdev->req_notifier, 0)) { 2323 error_report("vfio: Unable to init event notifier for device request"); 2324 return; 2325 } 2326 2327 argsz = sizeof(*irq_set) + sizeof(*pfd); 2328 2329 irq_set = g_malloc0(argsz); 2330 irq_set->argsz = argsz; 2331 irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | 2332 VFIO_IRQ_SET_ACTION_TRIGGER; 2333 irq_set->index = VFIO_PCI_REQ_IRQ_INDEX; 2334 irq_set->start = 0; 2335 irq_set->count = 1; 2336 pfd = (int32_t *)&irq_set->data; 2337 2338 *pfd = event_notifier_get_fd(&vdev->req_notifier); 2339 qemu_set_fd_handler(*pfd, vfio_req_notifier_handler, NULL, vdev); 2340 2341 if (ioctl(vdev->vbasedev.fd, VFIO_DEVICE_SET_IRQS, irq_set)) { 2342 error_report("vfio: Failed to set up device request notification"); 2343 qemu_set_fd_handler(*pfd, NULL, NULL, vdev); 2344 event_notifier_cleanup(&vdev->req_notifier); 2345 } else { 2346 vdev->req_enabled = true; 2347 } 2348 2349 g_free(irq_set); 2350 } 2351 2352 static void vfio_unregister_req_notifier(VFIOPCIDevice *vdev) 2353 { 2354 int argsz; 2355 struct vfio_irq_set *irq_set; 2356 int32_t *pfd; 2357 2358 if (!vdev->req_enabled) { 2359 return; 2360 } 2361 2362 argsz = sizeof(*irq_set) + sizeof(*pfd); 2363 2364 irq_set = g_malloc0(argsz); 2365 irq_set->argsz = argsz; 2366 irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | 2367 VFIO_IRQ_SET_ACTION_TRIGGER; 2368 irq_set->index = VFIO_PCI_REQ_IRQ_INDEX; 2369 irq_set->start = 0; 2370 irq_set->count = 1; 2371 pfd = (int32_t *)&irq_set->data; 2372 *pfd = -1; 2373 2374 if (ioctl(vdev->vbasedev.fd, VFIO_DEVICE_SET_IRQS, irq_set)) { 2375 error_report("vfio: Failed to de-assign device request fd: %m"); 2376 } 2377 g_free(irq_set); 2378 qemu_set_fd_handler(event_notifier_get_fd(&vdev->req_notifier), 2379 NULL, NULL, vdev); 2380 event_notifier_cleanup(&vdev->req_notifier); 2381 2382 vdev->req_enabled = false; 2383 } 2384 2385 static int vfio_initfn(PCIDevice *pdev) 2386 { 2387 VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, pdev); 2388 VFIODevice *vbasedev_iter; 2389 VFIOGroup *group; 2390 char *tmp, group_path[PATH_MAX], *group_name; 2391 ssize_t len; 2392 struct stat st; 2393 int groupid; 2394 int i, ret; 2395 2396 if (!vdev->vbasedev.sysfsdev) { 2397 vdev->vbasedev.sysfsdev = 2398 g_strdup_printf("/sys/bus/pci/devices/%04x:%02x:%02x.%01x", 2399 vdev->host.domain, vdev->host.bus, 2400 vdev->host.slot, vdev->host.function); 2401 } 2402 2403 if (stat(vdev->vbasedev.sysfsdev, &st) < 0) { 2404 error_report("vfio: error: no such host device: %s", 2405 vdev->vbasedev.sysfsdev); 2406 return -errno; 2407 } 2408 2409 vdev->vbasedev.name = g_strdup(basename(vdev->vbasedev.sysfsdev)); 2410 vdev->vbasedev.ops = &vfio_pci_ops; 2411 vdev->vbasedev.type = VFIO_DEVICE_TYPE_PCI; 2412 2413 tmp = g_strdup_printf("%s/iommu_group", vdev->vbasedev.sysfsdev); 2414 len = readlink(tmp, group_path, sizeof(group_path)); 2415 g_free(tmp); 2416 2417 if (len <= 0 || len >= sizeof(group_path)) { 2418 error_report("vfio: error no iommu_group for device"); 2419 return len < 0 ? -errno : -ENAMETOOLONG; 2420 } 2421 2422 group_path[len] = 0; 2423 2424 group_name = basename(group_path); 2425 if (sscanf(group_name, "%d", &groupid) != 1) { 2426 error_report("vfio: error reading %s: %m", group_path); 2427 return -errno; 2428 } 2429 2430 trace_vfio_initfn(vdev->vbasedev.name, groupid); 2431 2432 group = vfio_get_group(groupid, pci_device_iommu_address_space(pdev)); 2433 if (!group) { 2434 error_report("vfio: failed to get group %d", groupid); 2435 return -ENOENT; 2436 } 2437 2438 QLIST_FOREACH(vbasedev_iter, &group->device_list, next) { 2439 if (strcmp(vbasedev_iter->name, vdev->vbasedev.name) == 0) { 2440 error_report("vfio: error: device %s is already attached", 2441 vdev->vbasedev.name); 2442 vfio_put_group(group); 2443 return -EBUSY; 2444 } 2445 } 2446 2447 ret = vfio_get_device(group, vdev->vbasedev.name, &vdev->vbasedev); 2448 if (ret) { 2449 error_report("vfio: failed to get device %s", vdev->vbasedev.name); 2450 vfio_put_group(group); 2451 return ret; 2452 } 2453 2454 ret = vfio_populate_device(vdev); 2455 if (ret) { 2456 return ret; 2457 } 2458 2459 /* Get a copy of config space */ 2460 ret = pread(vdev->vbasedev.fd, vdev->pdev.config, 2461 MIN(pci_config_size(&vdev->pdev), vdev->config_size), 2462 vdev->config_offset); 2463 if (ret < (int)MIN(pci_config_size(&vdev->pdev), vdev->config_size)) { 2464 ret = ret < 0 ? -errno : -EFAULT; 2465 error_report("vfio: Failed to read device config space"); 2466 return ret; 2467 } 2468 2469 /* vfio emulates a lot for us, but some bits need extra love */ 2470 vdev->emulated_config_bits = g_malloc0(vdev->config_size); 2471 2472 /* QEMU can choose to expose the ROM or not */ 2473 memset(vdev->emulated_config_bits + PCI_ROM_ADDRESS, 0xff, 4); 2474 2475 /* 2476 * The PCI spec reserves vendor ID 0xffff as an invalid value. The 2477 * device ID is managed by the vendor and need only be a 16-bit value. 2478 * Allow any 16-bit value for subsystem so they can be hidden or changed. 2479 */ 2480 if (vdev->vendor_id != PCI_ANY_ID) { 2481 if (vdev->vendor_id >= 0xffff) { 2482 error_report("vfio: Invalid PCI vendor ID provided"); 2483 return -EINVAL; 2484 } 2485 vfio_add_emulated_word(vdev, PCI_VENDOR_ID, vdev->vendor_id, ~0); 2486 trace_vfio_pci_emulated_vendor_id(vdev->vbasedev.name, vdev->vendor_id); 2487 } else { 2488 vdev->vendor_id = pci_get_word(pdev->config + PCI_VENDOR_ID); 2489 } 2490 2491 if (vdev->device_id != PCI_ANY_ID) { 2492 if (vdev->device_id > 0xffff) { 2493 error_report("vfio: Invalid PCI device ID provided"); 2494 return -EINVAL; 2495 } 2496 vfio_add_emulated_word(vdev, PCI_DEVICE_ID, vdev->device_id, ~0); 2497 trace_vfio_pci_emulated_device_id(vdev->vbasedev.name, vdev->device_id); 2498 } else { 2499 vdev->device_id = pci_get_word(pdev->config + PCI_DEVICE_ID); 2500 } 2501 2502 if (vdev->sub_vendor_id != PCI_ANY_ID) { 2503 if (vdev->sub_vendor_id > 0xffff) { 2504 error_report("vfio: Invalid PCI subsystem vendor ID provided"); 2505 return -EINVAL; 2506 } 2507 vfio_add_emulated_word(vdev, PCI_SUBSYSTEM_VENDOR_ID, 2508 vdev->sub_vendor_id, ~0); 2509 trace_vfio_pci_emulated_sub_vendor_id(vdev->vbasedev.name, 2510 vdev->sub_vendor_id); 2511 } 2512 2513 if (vdev->sub_device_id != PCI_ANY_ID) { 2514 if (vdev->sub_device_id > 0xffff) { 2515 error_report("vfio: Invalid PCI subsystem device ID provided"); 2516 return -EINVAL; 2517 } 2518 vfio_add_emulated_word(vdev, PCI_SUBSYSTEM_ID, vdev->sub_device_id, ~0); 2519 trace_vfio_pci_emulated_sub_device_id(vdev->vbasedev.name, 2520 vdev->sub_device_id); 2521 } 2522 2523 /* QEMU can change multi-function devices to single function, or reverse */ 2524 vdev->emulated_config_bits[PCI_HEADER_TYPE] = 2525 PCI_HEADER_TYPE_MULTI_FUNCTION; 2526 2527 /* Restore or clear multifunction, this is always controlled by QEMU */ 2528 if (vdev->pdev.cap_present & QEMU_PCI_CAP_MULTIFUNCTION) { 2529 vdev->pdev.config[PCI_HEADER_TYPE] |= PCI_HEADER_TYPE_MULTI_FUNCTION; 2530 } else { 2531 vdev->pdev.config[PCI_HEADER_TYPE] &= ~PCI_HEADER_TYPE_MULTI_FUNCTION; 2532 } 2533 2534 /* 2535 * Clear host resource mapping info. If we choose not to register a 2536 * BAR, such as might be the case with the option ROM, we can get 2537 * confusing, unwritable, residual addresses from the host here. 2538 */ 2539 memset(&vdev->pdev.config[PCI_BASE_ADDRESS_0], 0, 24); 2540 memset(&vdev->pdev.config[PCI_ROM_ADDRESS], 0, 4); 2541 2542 vfio_pci_size_rom(vdev); 2543 2544 ret = vfio_msix_early_setup(vdev); 2545 if (ret) { 2546 return ret; 2547 } 2548 2549 vfio_bars_setup(vdev); 2550 2551 ret = vfio_add_capabilities(vdev); 2552 if (ret) { 2553 goto out_teardown; 2554 } 2555 2556 if (vdev->vga) { 2557 vfio_vga_quirk_setup(vdev); 2558 } 2559 2560 for (i = 0; i < PCI_ROM_SLOT; i++) { 2561 vfio_bar_quirk_setup(vdev, i); 2562 } 2563 2564 if (!vdev->igd_opregion && 2565 vdev->features & VFIO_FEATURE_ENABLE_IGD_OPREGION) { 2566 struct vfio_region_info *opregion; 2567 2568 if (vdev->pdev.qdev.hotplugged) { 2569 error_report("Cannot support IGD OpRegion feature on hotplugged " 2570 "device %s", vdev->vbasedev.name); 2571 ret = -EINVAL; 2572 goto out_teardown; 2573 } 2574 2575 ret = vfio_get_dev_region_info(&vdev->vbasedev, 2576 VFIO_REGION_TYPE_PCI_VENDOR_TYPE | PCI_VENDOR_ID_INTEL, 2577 VFIO_REGION_SUBTYPE_INTEL_IGD_OPREGION, &opregion); 2578 if (ret) { 2579 error_report("Device %s does not support requested IGD OpRegion " 2580 "feature", vdev->vbasedev.name); 2581 goto out_teardown; 2582 } 2583 2584 ret = vfio_pci_igd_opregion_init(vdev, opregion); 2585 g_free(opregion); 2586 if (ret) { 2587 error_report("Device %s IGD OpRegion initialization failed", 2588 vdev->vbasedev.name); 2589 goto out_teardown; 2590 } 2591 } 2592 2593 /* QEMU emulates all of MSI & MSIX */ 2594 if (pdev->cap_present & QEMU_PCI_CAP_MSIX) { 2595 memset(vdev->emulated_config_bits + pdev->msix_cap, 0xff, 2596 MSIX_CAP_LENGTH); 2597 } 2598 2599 if (pdev->cap_present & QEMU_PCI_CAP_MSI) { 2600 memset(vdev->emulated_config_bits + pdev->msi_cap, 0xff, 2601 vdev->msi_cap_size); 2602 } 2603 2604 if (vfio_pci_read_config(&vdev->pdev, PCI_INTERRUPT_PIN, 1)) { 2605 vdev->intx.mmap_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL, 2606 vfio_intx_mmap_enable, vdev); 2607 pci_device_set_intx_routing_notifier(&vdev->pdev, vfio_intx_update); 2608 ret = vfio_intx_enable(vdev); 2609 if (ret) { 2610 goto out_teardown; 2611 } 2612 } 2613 2614 vfio_register_err_notifier(vdev); 2615 vfio_register_req_notifier(vdev); 2616 vfio_setup_resetfn_quirk(vdev); 2617 2618 return 0; 2619 2620 out_teardown: 2621 pci_device_set_intx_routing_notifier(&vdev->pdev, NULL); 2622 vfio_teardown_msi(vdev); 2623 vfio_bars_exit(vdev); 2624 return ret; 2625 } 2626 2627 static void vfio_instance_finalize(Object *obj) 2628 { 2629 PCIDevice *pci_dev = PCI_DEVICE(obj); 2630 VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, pci_dev); 2631 VFIOGroup *group = vdev->vbasedev.group; 2632 2633 vfio_bars_finalize(vdev); 2634 g_free(vdev->emulated_config_bits); 2635 g_free(vdev->rom); 2636 /* 2637 * XXX Leaking igd_opregion is not an oversight, we can't remove the 2638 * fw_cfg entry therefore leaking this allocation seems like the safest 2639 * option. 2640 * 2641 * g_free(vdev->igd_opregion); 2642 */ 2643 vfio_put_device(vdev); 2644 vfio_put_group(group); 2645 } 2646 2647 static void vfio_exitfn(PCIDevice *pdev) 2648 { 2649 VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, pdev); 2650 2651 vfio_unregister_req_notifier(vdev); 2652 vfio_unregister_err_notifier(vdev); 2653 pci_device_set_intx_routing_notifier(&vdev->pdev, NULL); 2654 vfio_disable_interrupts(vdev); 2655 if (vdev->intx.mmap_timer) { 2656 timer_free(vdev->intx.mmap_timer); 2657 } 2658 vfio_teardown_msi(vdev); 2659 vfio_bars_exit(vdev); 2660 } 2661 2662 static void vfio_pci_reset(DeviceState *dev) 2663 { 2664 PCIDevice *pdev = DO_UPCAST(PCIDevice, qdev, dev); 2665 VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, pdev); 2666 2667 trace_vfio_pci_reset(vdev->vbasedev.name); 2668 2669 vfio_pci_pre_reset(vdev); 2670 2671 if (vdev->resetfn && !vdev->resetfn(vdev)) { 2672 goto post_reset; 2673 } 2674 2675 if (vdev->vbasedev.reset_works && 2676 (vdev->has_flr || !vdev->has_pm_reset) && 2677 !ioctl(vdev->vbasedev.fd, VFIO_DEVICE_RESET)) { 2678 trace_vfio_pci_reset_flr(vdev->vbasedev.name); 2679 goto post_reset; 2680 } 2681 2682 /* See if we can do our own bus reset */ 2683 if (!vfio_pci_hot_reset_one(vdev)) { 2684 goto post_reset; 2685 } 2686 2687 /* If nothing else works and the device supports PM reset, use it */ 2688 if (vdev->vbasedev.reset_works && vdev->has_pm_reset && 2689 !ioctl(vdev->vbasedev.fd, VFIO_DEVICE_RESET)) { 2690 trace_vfio_pci_reset_pm(vdev->vbasedev.name); 2691 goto post_reset; 2692 } 2693 2694 post_reset: 2695 vfio_pci_post_reset(vdev); 2696 } 2697 2698 static void vfio_instance_init(Object *obj) 2699 { 2700 PCIDevice *pci_dev = PCI_DEVICE(obj); 2701 VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, PCI_DEVICE(obj)); 2702 2703 device_add_bootindex_property(obj, &vdev->bootindex, 2704 "bootindex", NULL, 2705 &pci_dev->qdev, NULL); 2706 } 2707 2708 static Property vfio_pci_dev_properties[] = { 2709 DEFINE_PROP_PCI_HOST_DEVADDR("host", VFIOPCIDevice, host), 2710 DEFINE_PROP_STRING("sysfsdev", VFIOPCIDevice, vbasedev.sysfsdev), 2711 DEFINE_PROP_UINT32("x-intx-mmap-timeout-ms", VFIOPCIDevice, 2712 intx.mmap_timeout, 1100), 2713 DEFINE_PROP_BIT("x-vga", VFIOPCIDevice, features, 2714 VFIO_FEATURE_ENABLE_VGA_BIT, false), 2715 DEFINE_PROP_BIT("x-req", VFIOPCIDevice, features, 2716 VFIO_FEATURE_ENABLE_REQ_BIT, true), 2717 DEFINE_PROP_BIT("x-igd-opregion", VFIOPCIDevice, features, 2718 VFIO_FEATURE_ENABLE_IGD_OPREGION_BIT, false), 2719 DEFINE_PROP_BOOL("x-no-mmap", VFIOPCIDevice, vbasedev.no_mmap, false), 2720 DEFINE_PROP_BOOL("x-no-kvm-intx", VFIOPCIDevice, no_kvm_intx, false), 2721 DEFINE_PROP_BOOL("x-no-kvm-msi", VFIOPCIDevice, no_kvm_msi, false), 2722 DEFINE_PROP_BOOL("x-no-kvm-msix", VFIOPCIDevice, no_kvm_msix, false), 2723 DEFINE_PROP_UINT32("x-pci-vendor-id", VFIOPCIDevice, vendor_id, PCI_ANY_ID), 2724 DEFINE_PROP_UINT32("x-pci-device-id", VFIOPCIDevice, device_id, PCI_ANY_ID), 2725 DEFINE_PROP_UINT32("x-pci-sub-vendor-id", VFIOPCIDevice, 2726 sub_vendor_id, PCI_ANY_ID), 2727 DEFINE_PROP_UINT32("x-pci-sub-device-id", VFIOPCIDevice, 2728 sub_device_id, PCI_ANY_ID), 2729 DEFINE_PROP_UINT32("x-igd-gms", VFIOPCIDevice, igd_gms, 0), 2730 /* 2731 * TODO - support passed fds... is this necessary? 2732 * DEFINE_PROP_STRING("vfiofd", VFIOPCIDevice, vfiofd_name), 2733 * DEFINE_PROP_STRING("vfiogroupfd, VFIOPCIDevice, vfiogroupfd_name), 2734 */ 2735 DEFINE_PROP_END_OF_LIST(), 2736 }; 2737 2738 static const VMStateDescription vfio_pci_vmstate = { 2739 .name = "vfio-pci", 2740 .unmigratable = 1, 2741 }; 2742 2743 static void vfio_pci_dev_class_init(ObjectClass *klass, void *data) 2744 { 2745 DeviceClass *dc = DEVICE_CLASS(klass); 2746 PCIDeviceClass *pdc = PCI_DEVICE_CLASS(klass); 2747 2748 dc->reset = vfio_pci_reset; 2749 dc->props = vfio_pci_dev_properties; 2750 dc->vmsd = &vfio_pci_vmstate; 2751 dc->desc = "VFIO-based PCI device assignment"; 2752 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 2753 pdc->init = vfio_initfn; 2754 pdc->exit = vfio_exitfn; 2755 pdc->config_read = vfio_pci_read_config; 2756 pdc->config_write = vfio_pci_write_config; 2757 pdc->is_express = 1; /* We might be */ 2758 } 2759 2760 static const TypeInfo vfio_pci_dev_info = { 2761 .name = "vfio-pci", 2762 .parent = TYPE_PCI_DEVICE, 2763 .instance_size = sizeof(VFIOPCIDevice), 2764 .class_init = vfio_pci_dev_class_init, 2765 .instance_init = vfio_instance_init, 2766 .instance_finalize = vfio_instance_finalize, 2767 }; 2768 2769 static void register_vfio_pci_dev_type(void) 2770 { 2771 type_register_static(&vfio_pci_dev_info); 2772 } 2773 2774 type_init(register_vfio_pci_dev_type) 2775