?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
tap-bsd: Remove special casing for older OpenBSD releases
[qemu.git] / hw / vfio / common.c
blobae5654fcdb8dfd60de963d4087ab65dcffc6f523
1 /*
2 * generic functions used by VFIO devices
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 <sys/ioctl.h>
23 #ifdef CONFIG_KVM
24 #include <linux/kvm.h>
25 #endif
26 #include <linux/vfio.h>
27
28 #include "hw/vfio/vfio-common.h"
29 #include "hw/vfio/vfio.h"
30 #include "exec/address-spaces.h"
31 #include "exec/memory.h"
32 #include "exec/ram_addr.h"
33 #include "hw/hw.h"
34 #include "qemu/error-report.h"
35 #include "qemu/main-loop.h"
36 #include "qemu/range.h"
37 #include "sysemu/kvm.h"
38 #include "sysemu/reset.h"
39 #include "trace.h"
40 #include "qapi/error.h"
41 #include "migration/migration.h"
42
43 VFIOGroupList vfio_group_list =
44 QLIST_HEAD_INITIALIZER(vfio_group_list);
45 static QLIST_HEAD(, VFIOAddressSpace) vfio_address_spaces =
46 QLIST_HEAD_INITIALIZER(vfio_address_spaces);
47
48 #ifdef CONFIG_KVM
49 /*
50 * We have a single VFIO pseudo device per KVM VM. Once created it lives
51 * for the life of the VM. Closing the file descriptor only drops our
52 * reference to it and the device's reference to kvm. Therefore once
53 * initialized, this file descriptor is only released on QEMU exit and
54 * we'll re-use it should another vfio device be attached before then.
55 */
56 static int vfio_kvm_device_fd = -1;
57 #endif
58
59 /*
60 * Common VFIO interrupt disable
61 */
62 void vfio_disable_irqindex(VFIODevice *vbasedev, int index)
63 {
64 struct vfio_irq_set irq_set = {
65 .argsz = sizeof(irq_set),
66 .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER,
67 .index = index,
68 .start = 0,
69 .count = 0,
70 };
71
72 ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set);
73 }
74
75 void vfio_unmask_single_irqindex(VFIODevice *vbasedev, int index)
76 {
77 struct vfio_irq_set irq_set = {
78 .argsz = sizeof(irq_set),
79 .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_UNMASK,
80 .index = index,
81 .start = 0,
82 .count = 1,
83 };
84
85 ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set);
86 }
87
88 void vfio_mask_single_irqindex(VFIODevice *vbasedev, int index)
89 {
90 struct vfio_irq_set irq_set = {
91 .argsz = sizeof(irq_set),
92 .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_MASK,
93 .index = index,
94 .start = 0,
95 .count = 1,
96 };
97
98 ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set);
99 }
100
101 static inline const char *action_to_str(int action)
102 {
103 switch (action) {
104 case VFIO_IRQ_SET_ACTION_MASK:
105 return "MASK";
106 case VFIO_IRQ_SET_ACTION_UNMASK:
107 return "UNMASK";
108 case VFIO_IRQ_SET_ACTION_TRIGGER:
109 return "TRIGGER";
110 default:
111 return "UNKNOWN ACTION";
112 }
113 }
114
115 static const char *index_to_str(VFIODevice *vbasedev, int index)
116 {
117 if (vbasedev->type != VFIO_DEVICE_TYPE_PCI) {
118 return NULL;
119 }
120
121 switch (index) {
122 case VFIO_PCI_INTX_IRQ_INDEX:
123 return "INTX";
124 case VFIO_PCI_MSI_IRQ_INDEX:
125 return "MSI";
126 case VFIO_PCI_MSIX_IRQ_INDEX:
127 return "MSIX";
128 case VFIO_PCI_ERR_IRQ_INDEX:
129 return "ERR";
130 case VFIO_PCI_REQ_IRQ_INDEX:
131 return "REQ";
132 default:
133 return NULL;
134 }
135 }
136
137 int vfio_set_irq_signaling(VFIODevice *vbasedev, int index, int subindex,
138 int action, int fd, Error **errp)
139 {
140 struct vfio_irq_set *irq_set;
141 int argsz, ret = 0;
142 const char *name;
143 int32_t *pfd;
144
145 argsz = sizeof(*irq_set) + sizeof(*pfd);
146
147 irq_set = g_malloc0(argsz);
148 irq_set->argsz = argsz;
149 irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | action;
150 irq_set->index = index;
151 irq_set->start = subindex;
152 irq_set->count = 1;
153 pfd = (int32_t *)&irq_set->data;
154 *pfd = fd;
155
156 if (ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, irq_set)) {
157 ret = -errno;
158 }
159 g_free(irq_set);
160
161 if (!ret) {
162 return 0;
163 }
164
165 error_setg_errno(errp, -ret, "VFIO_DEVICE_SET_IRQS failure");
166
167 name = index_to_str(vbasedev, index);
168 if (name) {
169 error_prepend(errp, "%s-%d: ", name, subindex);
170 } else {
171 error_prepend(errp, "index %d-%d: ", index, subindex);
172 }
173 error_prepend(errp,
174 "Failed to %s %s eventfd signaling for interrupt ",
175 fd < 0 ? "tear down" : "set up", action_to_str(action));
176 return ret;
177 }
178
179 /*
180 * IO Port/MMIO - Beware of the endians, VFIO is always little endian
181 */
182 void vfio_region_write(void *opaque, hwaddr addr,
183 uint64_t data, unsigned size)
184 {
185 VFIORegion *region = opaque;
186 VFIODevice *vbasedev = region->vbasedev;
187 union {
188 uint8_t byte;
189 uint16_t word;
190 uint32_t dword;
191 uint64_t qword;
192 } buf;
193
194 switch (size) {
195 case 1:
196 buf.byte = data;
197 break;
198 case 2:
199 buf.word = cpu_to_le16(data);
200 break;
201 case 4:
202 buf.dword = cpu_to_le32(data);
203 break;
204 case 8:
205 buf.qword = cpu_to_le64(data);
206 break;
207 default:
208 hw_error("vfio: unsupported write size, %u bytes", size);
209 break;
210 }
211
212 if (pwrite(vbasedev->fd, &buf, size, region->fd_offset + addr) != size) {
213 error_report("%s(%s:region%d+0x%"HWADDR_PRIx", 0x%"PRIx64
214 ",%d) failed: %m",
215 __func__, vbasedev->name, region->nr,
216 addr, data, size);
217 }
218
219 trace_vfio_region_write(vbasedev->name, region->nr, addr, data, size);
220
221 /*
222 * A read or write to a BAR always signals an INTx EOI. This will
223 * do nothing if not pending (including not in INTx mode). We assume
224 * that a BAR access is in response to an interrupt and that BAR
225 * accesses will service the interrupt. Unfortunately, we don't know
226 * which access will service the interrupt, so we're potentially
227 * getting quite a few host interrupts per guest interrupt.
228 */
229 vbasedev->ops->vfio_eoi(vbasedev);
230 }
231
232 uint64_t vfio_region_read(void *opaque,
233 hwaddr addr, unsigned size)
234 {
235 VFIORegion *region = opaque;
236 VFIODevice *vbasedev = region->vbasedev;
237 union {
238 uint8_t byte;
239 uint16_t word;
240 uint32_t dword;
241 uint64_t qword;
242 } buf;
243 uint64_t data = 0;
244
245 if (pread(vbasedev->fd, &buf, size, region->fd_offset + addr) != size) {
246 error_report("%s(%s:region%d+0x%"HWADDR_PRIx", %d) failed: %m",
247 __func__, vbasedev->name, region->nr,
248 addr, size);
249 return (uint64_t)-1;
250 }
251 switch (size) {
252 case 1:
253 data = buf.byte;
254 break;
255 case 2:
256 data = le16_to_cpu(buf.word);
257 break;
258 case 4:
259 data = le32_to_cpu(buf.dword);
260 break;
261 case 8:
262 data = le64_to_cpu(buf.qword);
263 break;
264 default:
265 hw_error("vfio: unsupported read size, %u bytes", size);
266 break;
267 }
268
269 trace_vfio_region_read(vbasedev->name, region->nr, addr, size, data);
270
271 /* Same as write above */
272 vbasedev->ops->vfio_eoi(vbasedev);
273
274 return data;
275 }
276
277 const MemoryRegionOps vfio_region_ops = {
278 .read = vfio_region_read,
279 .write = vfio_region_write,
280 .endianness = DEVICE_LITTLE_ENDIAN,
281 .valid = {
282 .min_access_size = 1,
283 .max_access_size = 8,
284 },
285 .impl = {
286 .min_access_size = 1,
287 .max_access_size = 8,
288 },
289 };
290
291 /*
292 * Device state interfaces
293 */
294
295 bool vfio_mig_active(void)
296 {
297 VFIOGroup *group;
298 VFIODevice *vbasedev;
299
300 if (QLIST_EMPTY(&vfio_group_list)) {
301 return false;
302 }
303
304 QLIST_FOREACH(group, &vfio_group_list, next) {
305 QLIST_FOREACH(vbasedev, &group->device_list, next) {
306 if (vbasedev->migration_blocker) {
307 return false;
308 }
309 }
310 }
311 return true;
312 }
313
314 static bool vfio_devices_all_dirty_tracking(VFIOContainer *container)
315 {
316 VFIOGroup *group;
317 VFIODevice *vbasedev;
318 MigrationState *ms = migrate_get_current();
319
320 if (!migration_is_setup_or_active(ms->state)) {
321 return false;
322 }
323
324 QLIST_FOREACH(group, &container->group_list, container_next) {
325 QLIST_FOREACH(vbasedev, &group->device_list, next) {
326 VFIOMigration *migration = vbasedev->migration;
327
328 if (!migration) {
329 return false;
330 }
331
332 if ((vbasedev->pre_copy_dirty_page_tracking == ON_OFF_AUTO_OFF)
333 && (migration->device_state & VFIO_DEVICE_STATE_RUNNING)) {
334 return false;
335 }
336 }
337 }
338 return true;
339 }
340
341 static bool vfio_devices_all_running_and_saving(VFIOContainer *container)
342 {
343 VFIOGroup *group;
344 VFIODevice *vbasedev;
345 MigrationState *ms = migrate_get_current();
346
347 if (!migration_is_setup_or_active(ms->state)) {
348 return false;
349 }
350
351 QLIST_FOREACH(group, &container->group_list, container_next) {
352 QLIST_FOREACH(vbasedev, &group->device_list, next) {
353 VFIOMigration *migration = vbasedev->migration;
354
355 if (!migration) {
356 return false;
357 }
358
359 if ((migration->device_state & VFIO_DEVICE_STATE_SAVING) &&
360 (migration->device_state & VFIO_DEVICE_STATE_RUNNING)) {
361 continue;
362 } else {
363 return false;
364 }
365 }
366 }
367 return true;
368 }
369
370 static int vfio_dma_unmap_bitmap(VFIOContainer *container,
371 hwaddr iova, ram_addr_t size,
372 IOMMUTLBEntry *iotlb)
373 {
374 struct vfio_iommu_type1_dma_unmap *unmap;
375 struct vfio_bitmap *bitmap;
376 uint64_t pages = REAL_HOST_PAGE_ALIGN(size) / qemu_real_host_page_size;
377 int ret;
378
379 unmap = g_malloc0(sizeof(*unmap) + sizeof(*bitmap));
380
381 unmap->argsz = sizeof(*unmap) + sizeof(*bitmap);
382 unmap->iova = iova;
383 unmap->size = size;
384 unmap->flags |= VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP;
385 bitmap = (struct vfio_bitmap *)&unmap->data;
386
387 /*
388 * cpu_physical_memory_set_dirty_lebitmap() supports pages in bitmap of
389 * qemu_real_host_page_size to mark those dirty. Hence set bitmap_pgsize
390 * to qemu_real_host_page_size.
391 */
392
393 bitmap->pgsize = qemu_real_host_page_size;
394 bitmap->size = ROUND_UP(pages, sizeof(__u64) * BITS_PER_BYTE) /
395 BITS_PER_BYTE;
396
397 if (bitmap->size > container->max_dirty_bitmap_size) {
398 error_report("UNMAP: Size of bitmap too big 0x%"PRIx64,
399 (uint64_t)bitmap->size);
400 ret = -E2BIG;
401 goto unmap_exit;
402 }
403
404 bitmap->data = g_try_malloc0(bitmap->size);
405 if (!bitmap->data) {
406 ret = -ENOMEM;
407 goto unmap_exit;
408 }
409
410 ret = ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, unmap);
411 if (!ret) {
412 cpu_physical_memory_set_dirty_lebitmap((unsigned long *)bitmap->data,
413 iotlb->translated_addr, pages);
414 } else {
415 error_report("VFIO_UNMAP_DMA with DIRTY_BITMAP : %m");
416 }
417
418 g_free(bitmap->data);
419 unmap_exit:
420 g_free(unmap);
421 return ret;
422 }
423
424 /*
425 * DMA - Mapping and unmapping for the "type1" IOMMU interface used on x86
426 */
427 static int vfio_dma_unmap(VFIOContainer *container,
428 hwaddr iova, ram_addr_t size,
429 IOMMUTLBEntry *iotlb)
430 {
431 struct vfio_iommu_type1_dma_unmap unmap = {
432 .argsz = sizeof(unmap),
433 .flags = 0,
434 .iova = iova,
435 .size = size,
436 };
437
438 if (iotlb && container->dirty_pages_supported &&
439 vfio_devices_all_running_and_saving(container)) {
440 return vfio_dma_unmap_bitmap(container, iova, size, iotlb);
441 }
442
443 while (ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, &unmap)) {
444 /*
445 * The type1 backend has an off-by-one bug in the kernel (71a7d3d78e3c
446 * v4.15) where an overflow in its wrap-around check prevents us from
447 * unmapping the last page of the address space. Test for the error
448 * condition and re-try the unmap excluding the last page. The
449 * expectation is that we've never mapped the last page anyway and this
450 * unmap request comes via vIOMMU support which also makes it unlikely
451 * that this page is used. This bug was introduced well after type1 v2
452 * support was introduced, so we shouldn't need to test for v1. A fix
453 * is queued for kernel v5.0 so this workaround can be removed once
454 * affected kernels are sufficiently deprecated.
455 */
456 if (errno == EINVAL && unmap.size && !(unmap.iova + unmap.size) &&
457 container->iommu_type == VFIO_TYPE1v2_IOMMU) {
458 trace_vfio_dma_unmap_overflow_workaround();
459 unmap.size -= 1ULL << ctz64(container->pgsizes);
460 continue;
461 }
462 error_report("VFIO_UNMAP_DMA failed: %s", strerror(errno));
463 return -errno;
464 }
465
466 return 0;
467 }
468
469 static int vfio_dma_map(VFIOContainer *container, hwaddr iova,
470 ram_addr_t size, void *vaddr, bool readonly)
471 {
472 struct vfio_iommu_type1_dma_map map = {
473 .argsz = sizeof(map),
474 .flags = VFIO_DMA_MAP_FLAG_READ,
475 .vaddr = (__u64)(uintptr_t)vaddr,
476 .iova = iova,
477 .size = size,
478 };
479
480 if (!readonly) {
481 map.flags |= VFIO_DMA_MAP_FLAG_WRITE;
482 }
483
484 /*
485 * Try the mapping, if it fails with EBUSY, unmap the region and try
486 * again. This shouldn't be necessary, but we sometimes see it in
487 * the VGA ROM space.
488 */
489 if (ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0 ||
490 (errno == EBUSY && vfio_dma_unmap(container, iova, size, NULL) == 0 &&
491 ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0)) {
492 return 0;
493 }
494
495 error_report("VFIO_MAP_DMA failed: %s", strerror(errno));
496 return -errno;
497 }
498
499 static void vfio_host_win_add(VFIOContainer *container,
500 hwaddr min_iova, hwaddr max_iova,
501 uint64_t iova_pgsizes)
502 {
503 VFIOHostDMAWindow *hostwin;
504
505 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) {
506 if (ranges_overlap(hostwin->min_iova,
507 hostwin->max_iova - hostwin->min_iova + 1,
508 min_iova,
509 max_iova - min_iova + 1)) {
510 hw_error("%s: Overlapped IOMMU are not enabled", __func__);
511 }
512 }
513
514 hostwin = g_malloc0(sizeof(*hostwin));
515
516 hostwin->min_iova = min_iova;
517 hostwin->max_iova = max_iova;
518 hostwin->iova_pgsizes = iova_pgsizes;
519 QLIST_INSERT_HEAD(&container->hostwin_list, hostwin, hostwin_next);
520 }
521
522 static int vfio_host_win_del(VFIOContainer *container, hwaddr min_iova,
523 hwaddr max_iova)
524 {
525 VFIOHostDMAWindow *hostwin;
526
527 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) {
528 if (hostwin->min_iova == min_iova && hostwin->max_iova == max_iova) {
529 QLIST_REMOVE(hostwin, hostwin_next);
530 return 0;
531 }
532 }
533
534 return -1;
535 }
536
537 static bool vfio_listener_skipped_section(MemoryRegionSection *section)
538 {
539 return (!memory_region_is_ram(section->mr) &&
540 !memory_region_is_iommu(section->mr)) ||
541 /*
542 * Sizing an enabled 64-bit BAR can cause spurious mappings to
543 * addresses in the upper part of the 64-bit address space. These
544 * are never accessed by the CPU and beyond the address width of
545 * some IOMMU hardware. TODO: VFIO should tell us the IOMMU width.
546 */
547 section->offset_within_address_space & (1ULL << 63);
548 }
549
550 /* Called with rcu_read_lock held. */
551 static bool vfio_get_xlat_addr(IOMMUTLBEntry *iotlb, void **vaddr,
552 ram_addr_t *ram_addr, bool *read_only)
553 {
554 MemoryRegion *mr;
555 hwaddr xlat;
556 hwaddr len = iotlb->addr_mask + 1;
557 bool writable = iotlb->perm & IOMMU_WO;
558
559 /*
560 * The IOMMU TLB entry we have just covers translation through
561 * this IOMMU to its immediate target. We need to translate
562 * it the rest of the way through to memory.
563 */
564 mr = address_space_translate(&address_space_memory,
565 iotlb->translated_addr,
566 &xlat, &len, writable,
567 MEMTXATTRS_UNSPECIFIED);
568 if (!memory_region_is_ram(mr)) {
569 error_report("iommu map to non memory area %"HWADDR_PRIx"",
570 xlat);
571 return false;
572 }
573
574 /*
575 * Translation truncates length to the IOMMU page size,
576 * check that it did not truncate too much.
577 */
578 if (len & iotlb->addr_mask) {
579 error_report("iommu has granularity incompatible with target AS");
580 return false;
581 }
582
583 if (vaddr) {
584 *vaddr = memory_region_get_ram_ptr(mr) + xlat;
585 }
586
587 if (ram_addr) {
588 *ram_addr = memory_region_get_ram_addr(mr) + xlat;
589 }
590
591 if (read_only) {
592 *read_only = !writable || mr->readonly;
593 }
594
595 return true;
596 }
597
598 static void vfio_iommu_map_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb)
599 {
600 VFIOGuestIOMMU *giommu = container_of(n, VFIOGuestIOMMU, n);
601 VFIOContainer *container = giommu->container;
602 hwaddr iova = iotlb->iova + giommu->iommu_offset;
603 void *vaddr;
604 int ret;
605
606 trace_vfio_iommu_map_notify(iotlb->perm == IOMMU_NONE ? "UNMAP" : "MAP",
607 iova, iova + iotlb->addr_mask);
608
609 if (iotlb->target_as != &address_space_memory) {
610 error_report("Wrong target AS \"%s\", only system memory is allowed",
611 iotlb->target_as->name ? iotlb->target_as->name : "none");
612 return;
613 }
614
615 rcu_read_lock();
616
617 if ((iotlb->perm & IOMMU_RW) != IOMMU_NONE) {
618 bool read_only;
619
620 if (!vfio_get_xlat_addr(iotlb, &vaddr, NULL, &read_only)) {
621 goto out;
622 }
623 /*
624 * vaddr is only valid until rcu_read_unlock(). But after
625 * vfio_dma_map has set up the mapping the pages will be
626 * pinned by the kernel. This makes sure that the RAM backend
627 * of vaddr will always be there, even if the memory object is
628 * destroyed and its backing memory munmap-ed.
629 */
630 ret = vfio_dma_map(container, iova,
631 iotlb->addr_mask + 1, vaddr,
632 read_only);
633 if (ret) {
634 error_report("vfio_dma_map(%p, 0x%"HWADDR_PRIx", "
635 "0x%"HWADDR_PRIx", %p) = %d (%m)",
636 container, iova,
637 iotlb->addr_mask + 1, vaddr, ret);
638 }
639 } else {
640 ret = vfio_dma_unmap(container, iova, iotlb->addr_mask + 1, iotlb);
641 if (ret) {
642 error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", "
643 "0x%"HWADDR_PRIx") = %d (%m)",
644 container, iova,
645 iotlb->addr_mask + 1, ret);
646 }
647 }
648 out:
649 rcu_read_unlock();
650 }
651
652 static void vfio_listener_region_add(MemoryListener *listener,
653 MemoryRegionSection *section)
654 {
655 VFIOContainer *container = container_of(listener, VFIOContainer, listener);
656 hwaddr iova, end;
657 Int128 llend, llsize;
658 void *vaddr;
659 int ret;
660 VFIOHostDMAWindow *hostwin;
661 bool hostwin_found;
662 Error *err = NULL;
663
664 if (vfio_listener_skipped_section(section)) {
665 trace_vfio_listener_region_add_skip(
666 section->offset_within_address_space,
667 section->offset_within_address_space +
668 int128_get64(int128_sub(section->size, int128_one())));
669 return;
670 }
671
672 if (unlikely((section->offset_within_address_space &
673 ~qemu_real_host_page_mask) !=
674 (section->offset_within_region & ~qemu_real_host_page_mask))) {
675 error_report("%s received unaligned region", __func__);
676 return;
677 }
678
679 iova = REAL_HOST_PAGE_ALIGN(section->offset_within_address_space);
680 llend = int128_make64(section->offset_within_address_space);
681 llend = int128_add(llend, section->size);
682 llend = int128_and(llend, int128_exts64(qemu_real_host_page_mask));
683
684 if (int128_ge(int128_make64(iova), llend)) {
685 return;
686 }
687 end = int128_get64(int128_sub(llend, int128_one()));
688
689 if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) {
690 hwaddr pgsize = 0;
691
692 /* For now intersections are not allowed, we may relax this later */
693 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) {
694 if (ranges_overlap(hostwin->min_iova,
695 hostwin->max_iova - hostwin->min_iova + 1,
696 section->offset_within_address_space,
697 int128_get64(section->size))) {
698 error_setg(&err,
699 "region [0x%"PRIx64",0x%"PRIx64"] overlaps with existing"
700 "host DMA window [0x%"PRIx64",0x%"PRIx64"]",
701 section->offset_within_address_space,
702 section->offset_within_address_space +
703 int128_get64(section->size) - 1,
704 hostwin->min_iova, hostwin->max_iova);
705 goto fail;
706 }
707 }
708
709 ret = vfio_spapr_create_window(container, section, &pgsize);
710 if (ret) {
711 error_setg_errno(&err, -ret, "Failed to create SPAPR window");
712 goto fail;
713 }
714
715 vfio_host_win_add(container, section->offset_within_address_space,
716 section->offset_within_address_space +
717 int128_get64(section->size) - 1, pgsize);
718 #ifdef CONFIG_KVM
719 if (kvm_enabled()) {
720 VFIOGroup *group;
721 IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(section->mr);
722 struct kvm_vfio_spapr_tce param;
723 struct kvm_device_attr attr = {
724 .group = KVM_DEV_VFIO_GROUP,
725 .attr = KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE,
726 .addr = (uint64_t)(unsigned long)&param,
727 };
728
729 if (!memory_region_iommu_get_attr(iommu_mr, IOMMU_ATTR_SPAPR_TCE_FD,
730 &param.tablefd)) {
731 QLIST_FOREACH(group, &container->group_list, container_next) {
732 param.groupfd = group->fd;
733 if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) {
734 error_report("vfio: failed to setup fd %d "
735 "for a group with fd %d: %s",
736 param.tablefd, param.groupfd,
737 strerror(errno));
738 return;
739 }
740 trace_vfio_spapr_group_attach(param.groupfd, param.tablefd);
741 }
742 }
743 }
744 #endif
745 }
746
747 hostwin_found = false;
748 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) {
749 if (hostwin->min_iova <= iova && end <= hostwin->max_iova) {
750 hostwin_found = true;
751 break;
752 }
753 }
754
755 if (!hostwin_found) {
756 error_setg(&err, "Container %p can't map guest IOVA region"
757 " 0x%"HWADDR_PRIx"..0x%"HWADDR_PRIx, container, iova, end);
758 goto fail;
759 }
760
761 memory_region_ref(section->mr);
762
763 if (memory_region_is_iommu(section->mr)) {
764 VFIOGuestIOMMU *giommu;
765 IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(section->mr);
766 int iommu_idx;
767
768 trace_vfio_listener_region_add_iommu(iova, end);
769 /*
770 * FIXME: For VFIO iommu types which have KVM acceleration to
771 * avoid bouncing all map/unmaps through qemu this way, this
772 * would be the right place to wire that up (tell the KVM
773 * device emulation the VFIO iommu handles to use).
774 */
775 giommu = g_malloc0(sizeof(*giommu));
776 giommu->iommu = iommu_mr;
777 giommu->iommu_offset = section->offset_within_address_space -
778 section->offset_within_region;
779 giommu->container = container;
780 llend = int128_add(int128_make64(section->offset_within_region),
781 section->size);
782 llend = int128_sub(llend, int128_one());
783 iommu_idx = memory_region_iommu_attrs_to_index(iommu_mr,
784 MEMTXATTRS_UNSPECIFIED);
785 iommu_notifier_init(&giommu->n, vfio_iommu_map_notify,
786 IOMMU_NOTIFIER_IOTLB_EVENTS,
787 section->offset_within_region,
788 int128_get64(llend),
789 iommu_idx);
790
791 ret = memory_region_iommu_set_page_size_mask(giommu->iommu,
792 container->pgsizes,
793 &err);
794 if (ret) {
795 g_free(giommu);
796 goto fail;
797 }
798
799 ret = memory_region_register_iommu_notifier(section->mr, &giommu->n,
800 &err);
801 if (ret) {
802 g_free(giommu);
803 goto fail;
804 }
805 QLIST_INSERT_HEAD(&container->giommu_list, giommu, giommu_next);
806 memory_region_iommu_replay(giommu->iommu, &giommu->n);
807
808 return;
809 }
810
811 /* Here we assume that memory_region_is_ram(section->mr)==true */
812
813 vaddr = memory_region_get_ram_ptr(section->mr) +
814 section->offset_within_region +
815 (iova - section->offset_within_address_space);
816
817 trace_vfio_listener_region_add_ram(iova, end, vaddr);
818
819 llsize = int128_sub(llend, int128_make64(iova));
820
821 if (memory_region_is_ram_device(section->mr)) {
822 hwaddr pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1;
823
824 if ((iova & pgmask) || (int128_get64(llsize) & pgmask)) {
825 trace_vfio_listener_region_add_no_dma_map(
826 memory_region_name(section->mr),
827 section->offset_within_address_space,
828 int128_getlo(section->size),
829 pgmask + 1);
830 return;
831 }
832 }
833
834 ret = vfio_dma_map(container, iova, int128_get64(llsize),
835 vaddr, section->readonly);
836 if (ret) {
837 error_setg(&err, "vfio_dma_map(%p, 0x%"HWADDR_PRIx", "
838 "0x%"HWADDR_PRIx", %p) = %d (%m)",
839 container, iova, int128_get64(llsize), vaddr, ret);
840 if (memory_region_is_ram_device(section->mr)) {
841 /* Allow unexpected mappings not to be fatal for RAM devices */
842 error_report_err(err);
843 return;
844 }
845 goto fail;
846 }
847
848 return;
849
850 fail:
851 if (memory_region_is_ram_device(section->mr)) {
852 error_report("failed to vfio_dma_map. pci p2p may not work");
853 return;
854 }
855 /*
856 * On the initfn path, store the first error in the container so we
857 * can gracefully fail. Runtime, there's not much we can do other
858 * than throw a hardware error.
859 */
860 if (!container->initialized) {
861 if (!container->error) {
862 error_propagate_prepend(&container->error, err,
863 "Region %s: ",
864 memory_region_name(section->mr));
865 } else {
866 error_free(err);
867 }
868 } else {
869 error_report_err(err);
870 hw_error("vfio: DMA mapping failed, unable to continue");
871 }
872 }
873
874 static void vfio_listener_region_del(MemoryListener *listener,
875 MemoryRegionSection *section)
876 {
877 VFIOContainer *container = container_of(listener, VFIOContainer, listener);
878 hwaddr iova, end;
879 Int128 llend, llsize;
880 int ret;
881 bool try_unmap = true;
882
883 if (vfio_listener_skipped_section(section)) {
884 trace_vfio_listener_region_del_skip(
885 section->offset_within_address_space,
886 section->offset_within_address_space +
887 int128_get64(int128_sub(section->size, int128_one())));
888 return;
889 }
890
891 if (unlikely((section->offset_within_address_space &
892 ~qemu_real_host_page_mask) !=
893 (section->offset_within_region & ~qemu_real_host_page_mask))) {
894 error_report("%s received unaligned region", __func__);
895 return;
896 }
897
898 if (memory_region_is_iommu(section->mr)) {
899 VFIOGuestIOMMU *giommu;
900
901 QLIST_FOREACH(giommu, &container->giommu_list, giommu_next) {
902 if (MEMORY_REGION(giommu->iommu) == section->mr &&
903 giommu->n.start == section->offset_within_region) {
904 memory_region_unregister_iommu_notifier(section->mr,
905 &giommu->n);
906 QLIST_REMOVE(giommu, giommu_next);
907 g_free(giommu);
908 break;
909 }
910 }
911
912 /*
913 * FIXME: We assume the one big unmap below is adequate to
914 * remove any individual page mappings in the IOMMU which
915 * might have been copied into VFIO. This works for a page table
916 * based IOMMU where a big unmap flattens a large range of IO-PTEs.
917 * That may not be true for all IOMMU types.
918 */
919 }
920
921 iova = REAL_HOST_PAGE_ALIGN(section->offset_within_address_space);
922 llend = int128_make64(section->offset_within_address_space);
923 llend = int128_add(llend, section->size);
924 llend = int128_and(llend, int128_exts64(qemu_real_host_page_mask));
925
926 if (int128_ge(int128_make64(iova), llend)) {
927 return;
928 }
929 end = int128_get64(int128_sub(llend, int128_one()));
930
931 llsize = int128_sub(llend, int128_make64(iova));
932
933 trace_vfio_listener_region_del(iova, end);
934
935 if (memory_region_is_ram_device(section->mr)) {
936 hwaddr pgmask;
937 VFIOHostDMAWindow *hostwin;
938 bool hostwin_found = false;
939
940 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) {
941 if (hostwin->min_iova <= iova && end <= hostwin->max_iova) {
942 hostwin_found = true;
943 break;
944 }
945 }
946 assert(hostwin_found); /* or region_add() would have failed */
947
948 pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1;
949 try_unmap = !((iova & pgmask) || (int128_get64(llsize) & pgmask));
950 }
951
952 if (try_unmap) {
953 if (int128_eq(llsize, int128_2_64())) {
954 /* The unmap ioctl doesn't accept a full 64-bit span. */
955 llsize = int128_rshift(llsize, 1);
956 ret = vfio_dma_unmap(container, iova, int128_get64(llsize), NULL);
957 if (ret) {
958 error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", "
959 "0x%"HWADDR_PRIx") = %d (%m)",
960 container, iova, int128_get64(llsize), ret);
961 }
962 iova += int128_get64(llsize);
963 }
964 ret = vfio_dma_unmap(container, iova, int128_get64(llsize), NULL);
965 if (ret) {
966 error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", "
967 "0x%"HWADDR_PRIx") = %d (%m)",
968 container, iova, int128_get64(llsize), ret);
969 }
970 }
971
972 memory_region_unref(section->mr);
973
974 if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) {
975 vfio_spapr_remove_window(container,
976 section->offset_within_address_space);
977 if (vfio_host_win_del(container,
978 section->offset_within_address_space,
979 section->offset_within_address_space +
980 int128_get64(section->size) - 1) < 0) {
981 hw_error("%s: Cannot delete missing window at %"HWADDR_PRIx,
982 __func__, section->offset_within_address_space);
983 }
984 }
985 }
986
987 static void vfio_set_dirty_page_tracking(VFIOContainer *container, bool start)
988 {
989 int ret;
990 struct vfio_iommu_type1_dirty_bitmap dirty = {
991 .argsz = sizeof(dirty),
992 };
993
994 if (start) {
995 dirty.flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_START;
996 } else {
997 dirty.flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_STOP;
998 }
999
1000 ret = ioctl(container->fd, VFIO_IOMMU_DIRTY_PAGES, &dirty);
1001 if (ret) {
1002 error_report("Failed to set dirty tracking flag 0x%x errno: %d",
1003 dirty.flags, errno);
1004 }
1005 }
1006
1007 static void vfio_listener_log_global_start(MemoryListener *listener)
1008 {
1009 VFIOContainer *container = container_of(listener, VFIOContainer, listener);
1010
1011 vfio_set_dirty_page_tracking(container, true);
1012 }
1013
1014 static void vfio_listener_log_global_stop(MemoryListener *listener)
1015 {
1016 VFIOContainer *container = container_of(listener, VFIOContainer, listener);
1017
1018 vfio_set_dirty_page_tracking(container, false);
1019 }
1020
1021 static int vfio_get_dirty_bitmap(VFIOContainer *container, uint64_t iova,
1022 uint64_t size, ram_addr_t ram_addr)
1023 {
1024 struct vfio_iommu_type1_dirty_bitmap *dbitmap;
1025 struct vfio_iommu_type1_dirty_bitmap_get *range;
1026 uint64_t pages;
1027 int ret;
1028
1029 dbitmap = g_malloc0(sizeof(*dbitmap) + sizeof(*range));
1030
1031 dbitmap->argsz = sizeof(*dbitmap) + sizeof(*range);
1032 dbitmap->flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_GET_BITMAP;
1033 range = (struct vfio_iommu_type1_dirty_bitmap_get *)&dbitmap->data;
1034 range->iova = iova;
1035 range->size = size;
1036
1037 /*
1038 * cpu_physical_memory_set_dirty_lebitmap() supports pages in bitmap of
1039 * qemu_real_host_page_size to mark those dirty. Hence set bitmap's pgsize
1040 * to qemu_real_host_page_size.
1041 */
1042 range->bitmap.pgsize = qemu_real_host_page_size;
1043
1044 pages = REAL_HOST_PAGE_ALIGN(range->size) / qemu_real_host_page_size;
1045 range->bitmap.size = ROUND_UP(pages, sizeof(__u64) * BITS_PER_BYTE) /
1046 BITS_PER_BYTE;
1047 range->bitmap.data = g_try_malloc0(range->bitmap.size);
1048 if (!range->bitmap.data) {
1049 ret = -ENOMEM;
1050 goto err_out;
1051 }
1052
1053 ret = ioctl(container->fd, VFIO_IOMMU_DIRTY_PAGES, dbitmap);
1054 if (ret) {
1055 error_report("Failed to get dirty bitmap for iova: 0x%"PRIx64
1056 " size: 0x%"PRIx64" err: %d", (uint64_t)range->iova,
1057 (uint64_t)range->size, errno);
1058 goto err_out;
1059 }
1060
1061 cpu_physical_memory_set_dirty_lebitmap((unsigned long *)range->bitmap.data,
1062 ram_addr, pages);
1063
1064 trace_vfio_get_dirty_bitmap(container->fd, range->iova, range->size,
1065 range->bitmap.size, ram_addr);
1066 err_out:
1067 g_free(range->bitmap.data);
1068 g_free(dbitmap);
1069
1070 return ret;
1071 }
1072
1073 typedef struct {
1074 IOMMUNotifier n;
1075 VFIOGuestIOMMU *giommu;
1076 } vfio_giommu_dirty_notifier;
1077
1078 static void vfio_iommu_map_dirty_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb)
1079 {
1080 vfio_giommu_dirty_notifier *gdn = container_of(n,
1081 vfio_giommu_dirty_notifier, n);
1082 VFIOGuestIOMMU *giommu = gdn->giommu;
1083 VFIOContainer *container = giommu->container;
1084 hwaddr iova = iotlb->iova + giommu->iommu_offset;
1085 ram_addr_t translated_addr;
1086
1087 trace_vfio_iommu_map_dirty_notify(iova, iova + iotlb->addr_mask);
1088
1089 if (iotlb->target_as != &address_space_memory) {
1090 error_report("Wrong target AS \"%s\", only system memory is allowed",
1091 iotlb->target_as->name ? iotlb->target_as->name : "none");
1092 return;
1093 }
1094
1095 rcu_read_lock();
1096 if (vfio_get_xlat_addr(iotlb, NULL, &translated_addr, NULL)) {
1097 int ret;
1098
1099 ret = vfio_get_dirty_bitmap(container, iova, iotlb->addr_mask + 1,
1100 translated_addr);
1101 if (ret) {
1102 error_report("vfio_iommu_map_dirty_notify(%p, 0x%"HWADDR_PRIx", "
1103 "0x%"HWADDR_PRIx") = %d (%m)",
1104 container, iova,
1105 iotlb->addr_mask + 1, ret);
1106 }
1107 }
1108 rcu_read_unlock();
1109 }
1110
1111 static int vfio_sync_dirty_bitmap(VFIOContainer *container,
1112 MemoryRegionSection *section)
1113 {
1114 ram_addr_t ram_addr;
1115
1116 if (memory_region_is_iommu(section->mr)) {
1117 VFIOGuestIOMMU *giommu;
1118
1119 QLIST_FOREACH(giommu, &container->giommu_list, giommu_next) {
1120 if (MEMORY_REGION(giommu->iommu) == section->mr &&
1121 giommu->n.start == section->offset_within_region) {
1122 Int128 llend;
1123 vfio_giommu_dirty_notifier gdn = { .giommu = giommu };
1124 int idx = memory_region_iommu_attrs_to_index(giommu->iommu,
1125 MEMTXATTRS_UNSPECIFIED);
1126
1127 llend = int128_add(int128_make64(section->offset_within_region),
1128 section->size);
1129 llend = int128_sub(llend, int128_one());
1130
1131 iommu_notifier_init(&gdn.n,
1132 vfio_iommu_map_dirty_notify,
1133 IOMMU_NOTIFIER_MAP,
1134 section->offset_within_region,
1135 int128_get64(llend),
1136 idx);
1137 memory_region_iommu_replay(giommu->iommu, &gdn.n);
1138 break;
1139 }
1140 }
1141 return 0;
1142 }
1143
1144 ram_addr = memory_region_get_ram_addr(section->mr) +
1145 section->offset_within_region;
1146
1147 return vfio_get_dirty_bitmap(container,
1148 REAL_HOST_PAGE_ALIGN(section->offset_within_address_space),
1149 int128_get64(section->size), ram_addr);
1150 }
1151
1152 static void vfio_listener_log_sync(MemoryListener *listener,
1153 MemoryRegionSection *section)
1154 {
1155 VFIOContainer *container = container_of(listener, VFIOContainer, listener);
1156
1157 if (vfio_listener_skipped_section(section) ||
1158 !container->dirty_pages_supported) {
1159 return;
1160 }
1161
1162 if (vfio_devices_all_dirty_tracking(container)) {
1163 vfio_sync_dirty_bitmap(container, section);
1164 }
1165 }
1166
1167 static const MemoryListener vfio_memory_listener = {
1168 .region_add = vfio_listener_region_add,
1169 .region_del = vfio_listener_region_del,
1170 .log_global_start = vfio_listener_log_global_start,
1171 .log_global_stop = vfio_listener_log_global_stop,
1172 .log_sync = vfio_listener_log_sync,
1173 };
1174
1175 static void vfio_listener_release(VFIOContainer *container)
1176 {
1177 memory_listener_unregister(&container->listener);
1178 if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) {
1179 memory_listener_unregister(&container->prereg_listener);
1180 }
1181 }
1182
1183 static struct vfio_info_cap_header *
1184 vfio_get_cap(void *ptr, uint32_t cap_offset, uint16_t id)
1185 {
1186 struct vfio_info_cap_header *hdr;
1187
1188 for (hdr = ptr + cap_offset; hdr != ptr; hdr = ptr + hdr->next) {
1189 if (hdr->id == id) {
1190 return hdr;
1191 }
1192 }
1193
1194 return NULL;
1195 }
1196
1197 struct vfio_info_cap_header *
1198 vfio_get_region_info_cap(struct vfio_region_info *info, uint16_t id)
1199 {
1200 if (!(info->flags & VFIO_REGION_INFO_FLAG_CAPS)) {
1201 return NULL;
1202 }
1203
1204 return vfio_get_cap((void *)info, info->cap_offset, id);
1205 }
1206
1207 static struct vfio_info_cap_header *
1208 vfio_get_iommu_type1_info_cap(struct vfio_iommu_type1_info *info, uint16_t id)
1209 {
1210 if (!(info->flags & VFIO_IOMMU_INFO_CAPS)) {
1211 return NULL;
1212 }
1213
1214 return vfio_get_cap((void *)info, info->cap_offset, id);
1215 }
1216
1217 struct vfio_info_cap_header *
1218 vfio_get_device_info_cap(struct vfio_device_info *info, uint16_t id)
1219 {
1220 if (!(info->flags & VFIO_DEVICE_FLAGS_CAPS)) {
1221 return NULL;
1222 }
1223
1224 return vfio_get_cap((void *)info, info->cap_offset, id);
1225 }
1226
1227 bool vfio_get_info_dma_avail(struct vfio_iommu_type1_info *info,
1228 unsigned int *avail)
1229 {
1230 struct vfio_info_cap_header *hdr;
1231 struct vfio_iommu_type1_info_dma_avail *cap;
1232
1233 /* If the capability cannot be found, assume no DMA limiting */
1234 hdr = vfio_get_iommu_type1_info_cap(info,
1235 VFIO_IOMMU_TYPE1_INFO_DMA_AVAIL);
1236 if (hdr == NULL) {
1237 return false;
1238 }
1239
1240 if (avail != NULL) {
1241 cap = (void *) hdr;
1242 *avail = cap->avail;
1243 }
1244
1245 return true;
1246 }
1247
1248 static int vfio_setup_region_sparse_mmaps(VFIORegion *region,
1249 struct vfio_region_info *info)
1250 {
1251 struct vfio_info_cap_header *hdr;
1252 struct vfio_region_info_cap_sparse_mmap *sparse;
1253 int i, j;
1254
1255 hdr = vfio_get_region_info_cap(info, VFIO_REGION_INFO_CAP_SPARSE_MMAP);
1256 if (!hdr) {
1257 return -ENODEV;
1258 }
1259
1260 sparse = container_of(hdr, struct vfio_region_info_cap_sparse_mmap, header);
1261
1262 trace_vfio_region_sparse_mmap_header(region->vbasedev->name,
1263 region->nr, sparse->nr_areas);
1264
1265 region->mmaps = g_new0(VFIOMmap, sparse->nr_areas);
1266
1267 for (i = 0, j = 0; i < sparse->nr_areas; i++) {
1268 trace_vfio_region_sparse_mmap_entry(i, sparse->areas[i].offset,
1269 sparse->areas[i].offset +
1270 sparse->areas[i].size);
1271
1272 if (sparse->areas[i].size) {
1273 region->mmaps[j].offset = sparse->areas[i].offset;
1274 region->mmaps[j].size = sparse->areas[i].size;
1275 j++;
1276 }
1277 }
1278
1279 region->nr_mmaps = j;
1280 region->mmaps = g_realloc(region->mmaps, j * sizeof(VFIOMmap));
1281
1282 return 0;
1283 }
1284
1285 int vfio_region_setup(Object *obj, VFIODevice *vbasedev, VFIORegion *region,
1286 int index, const char *name)
1287 {
1288 struct vfio_region_info *info;
1289 int ret;
1290
1291 ret = vfio_get_region_info(vbasedev, index, &info);
1292 if (ret) {
1293 return ret;
1294 }
1295
1296 region->vbasedev = vbasedev;
1297 region->flags = info->flags;
1298 region->size = info->size;
1299 region->fd_offset = info->offset;
1300 region->nr = index;
1301
1302 if (region->size) {
1303 region->mem = g_new0(MemoryRegion, 1);
1304 memory_region_init_io(region->mem, obj, &vfio_region_ops,
1305 region, name, region->size);
1306
1307 if (!vbasedev->no_mmap &&
1308 region->flags & VFIO_REGION_INFO_FLAG_MMAP) {
1309
1310 ret = vfio_setup_region_sparse_mmaps(region, info);
1311
1312 if (ret) {
1313 region->nr_mmaps = 1;
1314 region->mmaps = g_new0(VFIOMmap, region->nr_mmaps);
1315 region->mmaps[0].offset = 0;
1316 region->mmaps[0].size = region->size;
1317 }
1318 }
1319 }
1320
1321 g_free(info);
1322
1323 trace_vfio_region_setup(vbasedev->name, index, name,
1324 region->flags, region->fd_offset, region->size);
1325 return 0;
1326 }
1327
1328 static void vfio_subregion_unmap(VFIORegion *region, int index)
1329 {
1330 trace_vfio_region_unmap(memory_region_name(&region->mmaps[index].mem),
1331 region->mmaps[index].offset,
1332 region->mmaps[index].offset +
1333 region->mmaps[index].size - 1);
1334 memory_region_del_subregion(region->mem, &region->mmaps[index].mem);
1335 munmap(region->mmaps[index].mmap, region->mmaps[index].size);
1336 object_unparent(OBJECT(&region->mmaps[index].mem));
1337 region->mmaps[index].mmap = NULL;
1338 }
1339
1340 int vfio_region_mmap(VFIORegion *region)
1341 {
1342 int i, prot = 0;
1343 char *name;
1344
1345 if (!region->mem) {
1346 return 0;
1347 }
1348
1349 prot |= region->flags & VFIO_REGION_INFO_FLAG_READ ? PROT_READ : 0;
1350 prot |= region->flags & VFIO_REGION_INFO_FLAG_WRITE ? PROT_WRITE : 0;
1351
1352 for (i = 0; i < region->nr_mmaps; i++) {
1353 region->mmaps[i].mmap = mmap(NULL, region->mmaps[i].size, prot,
1354 MAP_SHARED, region->vbasedev->fd,
1355 region->fd_offset +
1356 region->mmaps[i].offset);
1357 if (region->mmaps[i].mmap == MAP_FAILED) {
1358 int ret = -errno;
1359
1360 trace_vfio_region_mmap_fault(memory_region_name(region->mem), i,
1361 region->fd_offset +
1362 region->mmaps[i].offset,
1363 region->fd_offset +
1364 region->mmaps[i].offset +
1365 region->mmaps[i].size - 1, ret);
1366
1367 region->mmaps[i].mmap = NULL;
1368
1369 for (i--; i >= 0; i--) {
1370 vfio_subregion_unmap(region, i);
1371 }
1372
1373 return ret;
1374 }
1375
1376 name = g_strdup_printf("%s mmaps[%d]",
1377 memory_region_name(region->mem), i);
1378 memory_region_init_ram_device_ptr(&region->mmaps[i].mem,
1379 memory_region_owner(region->mem),
1380 name, region->mmaps[i].size,
1381 region->mmaps[i].mmap);
1382 g_free(name);
1383 memory_region_add_subregion(region->mem, region->mmaps[i].offset,
1384 &region->mmaps[i].mem);
1385
1386 trace_vfio_region_mmap(memory_region_name(&region->mmaps[i].mem),
1387 region->mmaps[i].offset,
1388 region->mmaps[i].offset +
1389 region->mmaps[i].size - 1);
1390 }
1391
1392 return 0;
1393 }
1394
1395 void vfio_region_unmap(VFIORegion *region)
1396 {
1397 int i;
1398
1399 if (!region->mem) {
1400 return;
1401 }
1402
1403 for (i = 0; i < region->nr_mmaps; i++) {
1404 if (region->mmaps[i].mmap) {
1405 vfio_subregion_unmap(region, i);
1406 }
1407 }
1408 }
1409
1410 void vfio_region_exit(VFIORegion *region)
1411 {
1412 int i;
1413
1414 if (!region->mem) {
1415 return;
1416 }
1417
1418 for (i = 0; i < region->nr_mmaps; i++) {
1419 if (region->mmaps[i].mmap) {
1420 memory_region_del_subregion(region->mem, &region->mmaps[i].mem);
1421 }
1422 }
1423
1424 trace_vfio_region_exit(region->vbasedev->name, region->nr);
1425 }
1426
1427 void vfio_region_finalize(VFIORegion *region)
1428 {
1429 int i;
1430
1431 if (!region->mem) {
1432 return;
1433 }
1434
1435 for (i = 0; i < region->nr_mmaps; i++) {
1436 if (region->mmaps[i].mmap) {
1437 munmap(region->mmaps[i].mmap, region->mmaps[i].size);
1438 object_unparent(OBJECT(&region->mmaps[i].mem));
1439 }
1440 }
1441
1442 object_unparent(OBJECT(region->mem));
1443
1444 g_free(region->mem);
1445 g_free(region->mmaps);
1446
1447 trace_vfio_region_finalize(region->vbasedev->name, region->nr);
1448
1449 region->mem = NULL;
1450 region->mmaps = NULL;
1451 region->nr_mmaps = 0;
1452 region->size = 0;
1453 region->flags = 0;
1454 region->nr = 0;
1455 }
1456
1457 void vfio_region_mmaps_set_enabled(VFIORegion *region, bool enabled)
1458 {
1459 int i;
1460
1461 if (!region->mem) {
1462 return;
1463 }
1464
1465 for (i = 0; i < region->nr_mmaps; i++) {
1466 if (region->mmaps[i].mmap) {
1467 memory_region_set_enabled(&region->mmaps[i].mem, enabled);
1468 }
1469 }
1470
1471 trace_vfio_region_mmaps_set_enabled(memory_region_name(region->mem),
1472 enabled);
1473 }
1474
1475 void vfio_reset_handler(void *opaque)
1476 {
1477 VFIOGroup *group;
1478 VFIODevice *vbasedev;
1479
1480 QLIST_FOREACH(group, &vfio_group_list, next) {
1481 QLIST_FOREACH(vbasedev, &group->device_list, next) {
1482 if (vbasedev->dev->realized) {
1483 vbasedev->ops->vfio_compute_needs_reset(vbasedev);
1484 }
1485 }
1486 }
1487
1488 QLIST_FOREACH(group, &vfio_group_list, next) {
1489 QLIST_FOREACH(vbasedev, &group->device_list, next) {
1490 if (vbasedev->dev->realized && vbasedev->needs_reset) {
1491 vbasedev->ops->vfio_hot_reset_multi(vbasedev);
1492 }
1493 }
1494 }
1495 }
1496
1497 static void vfio_kvm_device_add_group(VFIOGroup *group)
1498 {
1499 #ifdef CONFIG_KVM
1500 struct kvm_device_attr attr = {
1501 .group = KVM_DEV_VFIO_GROUP,
1502 .attr = KVM_DEV_VFIO_GROUP_ADD,
1503 .addr = (uint64_t)(unsigned long)&group->fd,
1504 };
1505
1506 if (!kvm_enabled()) {
1507 return;
1508 }
1509
1510 if (vfio_kvm_device_fd < 0) {
1511 struct kvm_create_device cd = {
1512 .type = KVM_DEV_TYPE_VFIO,
1513 };
1514
1515 if (kvm_vm_ioctl(kvm_state, KVM_CREATE_DEVICE, &cd)) {
1516 error_report("Failed to create KVM VFIO device: %m");
1517 return;
1518 }
1519
1520 vfio_kvm_device_fd = cd.fd;
1521 }
1522
1523 if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) {
1524 error_report("Failed to add group %d to KVM VFIO device: %m",
1525 group->groupid);
1526 }
1527 #endif
1528 }
1529
1530 static void vfio_kvm_device_del_group(VFIOGroup *group)
1531 {
1532 #ifdef CONFIG_KVM
1533 struct kvm_device_attr attr = {
1534 .group = KVM_DEV_VFIO_GROUP,
1535 .attr = KVM_DEV_VFIO_GROUP_DEL,
1536 .addr = (uint64_t)(unsigned long)&group->fd,
1537 };
1538
1539 if (vfio_kvm_device_fd < 0) {
1540 return;
1541 }
1542
1543 if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) {
1544 error_report("Failed to remove group %d from KVM VFIO device: %m",
1545 group->groupid);
1546 }
1547 #endif
1548 }
1549
1550 static VFIOAddressSpace *vfio_get_address_space(AddressSpace *as)
1551 {
1552 VFIOAddressSpace *space;
1553
1554 QLIST_FOREACH(space, &vfio_address_spaces, list) {
1555 if (space->as == as) {
1556 return space;
1557 }
1558 }
1559
1560 /* No suitable VFIOAddressSpace, create a new one */
1561 space = g_malloc0(sizeof(*space));
1562 space->as = as;
1563 QLIST_INIT(&space->containers);
1564
1565 QLIST_INSERT_HEAD(&vfio_address_spaces, space, list);
1566
1567 return space;
1568 }
1569
1570 static void vfio_put_address_space(VFIOAddressSpace *space)
1571 {
1572 if (QLIST_EMPTY(&space->containers)) {
1573 QLIST_REMOVE(space, list);
1574 g_free(space);
1575 }
1576 }
1577
1578 /*
1579 * vfio_get_iommu_type - selects the richest iommu_type (v2 first)
1580 */
1581 static int vfio_get_iommu_type(VFIOContainer *container,
1582 Error **errp)
1583 {
1584 int iommu_types[] = { VFIO_TYPE1v2_IOMMU, VFIO_TYPE1_IOMMU,
1585 VFIO_SPAPR_TCE_v2_IOMMU, VFIO_SPAPR_TCE_IOMMU };
1586 int i;
1587
1588 for (i = 0; i < ARRAY_SIZE(iommu_types); i++) {
1589 if (ioctl(container->fd, VFIO_CHECK_EXTENSION, iommu_types[i])) {
1590 return iommu_types[i];
1591 }
1592 }
1593 error_setg(errp, "No available IOMMU models");
1594 return -EINVAL;
1595 }
1596
1597 static int vfio_init_container(VFIOContainer *container, int group_fd,
1598 Error **errp)
1599 {
1600 int iommu_type, ret;
1601
1602 iommu_type = vfio_get_iommu_type(container, errp);
1603 if (iommu_type < 0) {
1604 return iommu_type;
1605 }
1606
1607 ret = ioctl(group_fd, VFIO_GROUP_SET_CONTAINER, &container->fd);
1608 if (ret) {
1609 error_setg_errno(errp, errno, "Failed to set group container");
1610 return -errno;
1611 }
1612
1613 while (ioctl(container->fd, VFIO_SET_IOMMU, iommu_type)) {
1614 if (iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) {
1615 /*
1616 * On sPAPR, despite the IOMMU subdriver always advertises v1 and
1617 * v2, the running platform may not support v2 and there is no
1618 * way to guess it until an IOMMU group gets added to the container.
1619 * So in case it fails with v2, try v1 as a fallback.
1620 */
1621 iommu_type = VFIO_SPAPR_TCE_IOMMU;
1622 continue;
1623 }
1624 error_setg_errno(errp, errno, "Failed to set iommu for container");
1625 return -errno;
1626 }
1627
1628 container->iommu_type = iommu_type;
1629 return 0;
1630 }
1631
1632 static int vfio_get_iommu_info(VFIOContainer *container,
1633 struct vfio_iommu_type1_info **info)
1634 {
1635
1636 size_t argsz = sizeof(struct vfio_iommu_type1_info);
1637
1638 *info = g_new0(struct vfio_iommu_type1_info, 1);
1639 again:
1640 (*info)->argsz = argsz;
1641
1642 if (ioctl(container->fd, VFIO_IOMMU_GET_INFO, *info)) {
1643 g_free(*info);
1644 *info = NULL;
1645 return -errno;
1646 }
1647
1648 if (((*info)->argsz > argsz)) {
1649 argsz = (*info)->argsz;
1650 *info = g_realloc(*info, argsz);
1651 goto again;
1652 }
1653
1654 return 0;
1655 }
1656
1657 static struct vfio_info_cap_header *
1658 vfio_get_iommu_info_cap(struct vfio_iommu_type1_info *info, uint16_t id)
1659 {
1660 struct vfio_info_cap_header *hdr;
1661 void *ptr = info;
1662
1663 if (!(info->flags & VFIO_IOMMU_INFO_CAPS)) {
1664 return NULL;
1665 }
1666
1667 for (hdr = ptr + info->cap_offset; hdr != ptr; hdr = ptr + hdr->next) {
1668 if (hdr->id == id) {
1669 return hdr;
1670 }
1671 }
1672
1673 return NULL;
1674 }
1675
1676 static void vfio_get_iommu_info_migration(VFIOContainer *container,
1677 struct vfio_iommu_type1_info *info)
1678 {
1679 struct vfio_info_cap_header *hdr;
1680 struct vfio_iommu_type1_info_cap_migration *cap_mig;
1681
1682 hdr = vfio_get_iommu_info_cap(info, VFIO_IOMMU_TYPE1_INFO_CAP_MIGRATION);
1683 if (!hdr) {
1684 return;
1685 }
1686
1687 cap_mig = container_of(hdr, struct vfio_iommu_type1_info_cap_migration,
1688 header);
1689
1690 /*
1691 * cpu_physical_memory_set_dirty_lebitmap() supports pages in bitmap of
1692 * qemu_real_host_page_size to mark those dirty.
1693 */
1694 if (cap_mig->pgsize_bitmap & qemu_real_host_page_size) {
1695 container->dirty_pages_supported = true;
1696 container->max_dirty_bitmap_size = cap_mig->max_dirty_bitmap_size;
1697 container->dirty_pgsizes = cap_mig->pgsize_bitmap;
1698 }
1699 }
1700
1701 static int vfio_connect_container(VFIOGroup *group, AddressSpace *as,
1702 Error **errp)
1703 {
1704 VFIOContainer *container;
1705 int ret, fd;
1706 VFIOAddressSpace *space;
1707
1708 space = vfio_get_address_space(as);
1709
1710 /*
1711 * VFIO is currently incompatible with discarding of RAM insofar as the
1712 * madvise to purge (zap) the page from QEMU's address space does not
1713 * interact with the memory API and therefore leaves stale virtual to
1714 * physical mappings in the IOMMU if the page was previously pinned. We
1715 * therefore set discarding broken for each group added to a container,
1716 * whether the container is used individually or shared. This provides
1717 * us with options to allow devices within a group to opt-in and allow
1718 * discarding, so long as it is done consistently for a group (for instance
1719 * if the device is an mdev device where it is known that the host vendor
1720 * driver will never pin pages outside of the working set of the guest
1721 * driver, which would thus not be discarding candidates).
1722 *
1723 * The first opportunity to induce pinning occurs here where we attempt to
1724 * attach the group to existing containers within the AddressSpace. If any
1725 * pages are already zapped from the virtual address space, such as from
1726 * previous discards, new pinning will cause valid mappings to be
1727 * re-established. Likewise, when the overall MemoryListener for a new
1728 * container is registered, a replay of mappings within the AddressSpace
1729 * will occur, re-establishing any previously zapped pages as well.
1730 *
1731 * Especially virtio-balloon is currently only prevented from discarding
1732 * new memory, it will not yet set ram_block_discard_set_required() and
1733 * therefore, neither stops us here or deals with the sudden memory
1734 * consumption of inflated memory.
1735 */
1736 ret = ram_block_discard_disable(true);
1737 if (ret) {
1738 error_setg_errno(errp, -ret, "Cannot set discarding of RAM broken");
1739 return ret;
1740 }
1741
1742 QLIST_FOREACH(container, &space->containers, next) {
1743 if (!ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &container->fd)) {
1744 group->container = container;
1745 QLIST_INSERT_HEAD(&container->group_list, group, container_next);
1746 vfio_kvm_device_add_group(group);
1747 return 0;
1748 }
1749 }
1750
1751 fd = qemu_open_old("/dev/vfio/vfio", O_RDWR);
1752 if (fd < 0) {
1753 error_setg_errno(errp, errno, "failed to open /dev/vfio/vfio");
1754 ret = -errno;
1755 goto put_space_exit;
1756 }
1757
1758 ret = ioctl(fd, VFIO_GET_API_VERSION);
1759 if (ret != VFIO_API_VERSION) {
1760 error_setg(errp, "supported vfio version: %d, "
1761 "reported version: %d", VFIO_API_VERSION, ret);
1762 ret = -EINVAL;
1763 goto close_fd_exit;
1764 }
1765
1766 container = g_malloc0(sizeof(*container));
1767 container->space = space;
1768 container->fd = fd;
1769 container->error = NULL;
1770 container->dirty_pages_supported = false;
1771 QLIST_INIT(&container->giommu_list);
1772 QLIST_INIT(&container->hostwin_list);
1773
1774 ret = vfio_init_container(container, group->fd, errp);
1775 if (ret) {
1776 goto free_container_exit;
1777 }
1778
1779 switch (container->iommu_type) {
1780 case VFIO_TYPE1v2_IOMMU:
1781 case VFIO_TYPE1_IOMMU:
1782 {
1783 struct vfio_iommu_type1_info *info;
1784
1785 /*
1786 * FIXME: This assumes that a Type1 IOMMU can map any 64-bit
1787 * IOVA whatsoever. That's not actually true, but the current
1788 * kernel interface doesn't tell us what it can map, and the
1789 * existing Type1 IOMMUs generally support any IOVA we're
1790 * going to actually try in practice.
1791 */
1792 ret = vfio_get_iommu_info(container, &info);
1793
1794 if (ret || !(info->flags & VFIO_IOMMU_INFO_PGSIZES)) {
1795 /* Assume 4k IOVA page size */
1796 info->iova_pgsizes = 4096;
1797 }
1798 vfio_host_win_add(container, 0, (hwaddr)-1, info->iova_pgsizes);
1799 container->pgsizes = info->iova_pgsizes;
1800
1801 if (!ret) {
1802 vfio_get_iommu_info_migration(container, info);
1803 }
1804 g_free(info);
1805 break;
1806 }
1807 case VFIO_SPAPR_TCE_v2_IOMMU:
1808 case VFIO_SPAPR_TCE_IOMMU:
1809 {
1810 struct vfio_iommu_spapr_tce_info info;
1811 bool v2 = container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU;
1812
1813 /*
1814 * The host kernel code implementing VFIO_IOMMU_DISABLE is called
1815 * when container fd is closed so we do not call it explicitly
1816 * in this file.
1817 */
1818 if (!v2) {
1819 ret = ioctl(fd, VFIO_IOMMU_ENABLE);
1820 if (ret) {
1821 error_setg_errno(errp, errno, "failed to enable container");
1822 ret = -errno;
1823 goto free_container_exit;
1824 }
1825 } else {
1826 container->prereg_listener = vfio_prereg_listener;
1827
1828 memory_listener_register(&container->prereg_listener,
1829 &address_space_memory);
1830 if (container->error) {
1831 memory_listener_unregister(&container->prereg_listener);
1832 ret = -1;
1833 error_propagate_prepend(errp, container->error,
1834 "RAM memory listener initialization failed: ");
1835 goto free_container_exit;
1836 }
1837 }
1838
1839 info.argsz = sizeof(info);
1840 ret = ioctl(fd, VFIO_IOMMU_SPAPR_TCE_GET_INFO, &info);
1841 if (ret) {
1842 error_setg_errno(errp, errno,
1843 "VFIO_IOMMU_SPAPR_TCE_GET_INFO failed");
1844 ret = -errno;
1845 if (v2) {
1846 memory_listener_unregister(&container->prereg_listener);
1847 }
1848 goto free_container_exit;
1849 }
1850
1851 if (v2) {
1852 container->pgsizes = info.ddw.pgsizes;
1853 /*
1854 * There is a default window in just created container.
1855 * To make region_add/del simpler, we better remove this
1856 * window now and let those iommu_listener callbacks
1857 * create/remove them when needed.
1858 */
1859 ret = vfio_spapr_remove_window(container, info.dma32_window_start);
1860 if (ret) {
1861 error_setg_errno(errp, -ret,
1862 "failed to remove existing window");
1863 goto free_container_exit;
1864 }
1865 } else {
1866 /* The default table uses 4K pages */
1867 container->pgsizes = 0x1000;
1868 vfio_host_win_add(container, info.dma32_window_start,
1869 info.dma32_window_start +
1870 info.dma32_window_size - 1,
1871 0x1000);
1872 }
1873 }
1874 }
1875
1876 vfio_kvm_device_add_group(group);
1877
1878 QLIST_INIT(&container->group_list);
1879 QLIST_INSERT_HEAD(&space->containers, container, next);
1880
1881 group->container = container;
1882 QLIST_INSERT_HEAD(&container->group_list, group, container_next);
1883
1884 container->listener = vfio_memory_listener;
1885
1886 memory_listener_register(&container->listener, container->space->as);
1887
1888 if (container->error) {
1889 ret = -1;
1890 error_propagate_prepend(errp, container->error,
1891 "memory listener initialization failed: ");
1892 goto listener_release_exit;
1893 }
1894
1895 container->initialized = true;
1896
1897 return 0;
1898 listener_release_exit:
1899 QLIST_REMOVE(group, container_next);
1900 QLIST_REMOVE(container, next);
1901 vfio_kvm_device_del_group(group);
1902 vfio_listener_release(container);
1903
1904 free_container_exit:
1905 g_free(container);
1906
1907 close_fd_exit:
1908 close(fd);
1909
1910 put_space_exit:
1911 ram_block_discard_disable(false);
1912 vfio_put_address_space(space);
1913
1914 return ret;
1915 }
1916
1917 static void vfio_disconnect_container(VFIOGroup *group)
1918 {
1919 VFIOContainer *container = group->container;
1920
1921 QLIST_REMOVE(group, container_next);
1922 group->container = NULL;
1923
1924 /*
1925 * Explicitly release the listener first before unset container,
1926 * since unset may destroy the backend container if it's the last
1927 * group.
1928 */
1929 if (QLIST_EMPTY(&container->group_list)) {
1930 vfio_listener_release(container);
1931 }
1932
1933 if (ioctl(group->fd, VFIO_GROUP_UNSET_CONTAINER, &container->fd)) {
1934 error_report("vfio: error disconnecting group %d from container",
1935 group->groupid);
1936 }
1937
1938 if (QLIST_EMPTY(&container->group_list)) {
1939 VFIOAddressSpace *space = container->space;
1940 VFIOGuestIOMMU *giommu, *tmp;
1941
1942 QLIST_REMOVE(container, next);
1943
1944 QLIST_FOREACH_SAFE(giommu, &container->giommu_list, giommu_next, tmp) {
1945 memory_region_unregister_iommu_notifier(
1946 MEMORY_REGION(giommu->iommu), &giommu->n);
1947 QLIST_REMOVE(giommu, giommu_next);
1948 g_free(giommu);
1949 }
1950
1951 trace_vfio_disconnect_container(container->fd);
1952 close(container->fd);
1953 g_free(container);
1954
1955 vfio_put_address_space(space);
1956 }
1957 }
1958
1959 VFIOGroup *vfio_get_group(int groupid, AddressSpace *as, Error **errp)
1960 {
1961 VFIOGroup *group;
1962 char path[32];
1963 struct vfio_group_status status = { .argsz = sizeof(status) };
1964
1965 QLIST_FOREACH(group, &vfio_group_list, next) {
1966 if (group->groupid == groupid) {
1967 /* Found it. Now is it already in the right context? */
1968 if (group->container->space->as == as) {
1969 return group;
1970 } else {
1971 error_setg(errp, "group %d used in multiple address spaces",
1972 group->groupid);
1973 return NULL;
1974 }
1975 }
1976 }
1977
1978 group = g_malloc0(sizeof(*group));
1979
1980 snprintf(path, sizeof(path), "/dev/vfio/%d", groupid);
1981 group->fd = qemu_open_old(path, O_RDWR);
1982 if (group->fd < 0) {
1983 error_setg_errno(errp, errno, "failed to open %s", path);
1984 goto free_group_exit;
1985 }
1986
1987 if (ioctl(group->fd, VFIO_GROUP_GET_STATUS, &status)) {
1988 error_setg_errno(errp, errno, "failed to get group %d status", groupid);
1989 goto close_fd_exit;
1990 }
1991
1992 if (!(status.flags & VFIO_GROUP_FLAGS_VIABLE)) {
1993 error_setg(errp, "group %d is not viable", groupid);
1994 error_append_hint(errp,
1995 "Please ensure all devices within the iommu_group "
1996 "are bound to their vfio bus driver.\n");
1997 goto close_fd_exit;
1998 }
1999
2000 group->groupid = groupid;
2001 QLIST_INIT(&group->device_list);
2002
2003 if (vfio_connect_container(group, as, errp)) {
2004 error_prepend(errp, "failed to setup container for group %d: ",
2005 groupid);
2006 goto close_fd_exit;
2007 }
2008
2009 if (QLIST_EMPTY(&vfio_group_list)) {
2010 qemu_register_reset(vfio_reset_handler, NULL);
2011 }
2012
2013 QLIST_INSERT_HEAD(&vfio_group_list, group, next);
2014
2015 return group;
2016
2017 close_fd_exit:
2018 close(group->fd);
2019
2020 free_group_exit:
2021 g_free(group);
2022
2023 return NULL;
2024 }
2025
2026 void vfio_put_group(VFIOGroup *group)
2027 {
2028 if (!group || !QLIST_EMPTY(&group->device_list)) {
2029 return;
2030 }
2031
2032 if (!group->ram_block_discard_allowed) {
2033 ram_block_discard_disable(false);
2034 }
2035 vfio_kvm_device_del_group(group);
2036 vfio_disconnect_container(group);
2037 QLIST_REMOVE(group, next);
2038 trace_vfio_put_group(group->fd);
2039 close(group->fd);
2040 g_free(group);
2041
2042 if (QLIST_EMPTY(&vfio_group_list)) {
2043 qemu_unregister_reset(vfio_reset_handler, NULL);
2044 }
2045 }
2046
2047 int vfio_get_device(VFIOGroup *group, const char *name,
2048 VFIODevice *vbasedev, Error **errp)
2049 {
2050 struct vfio_device_info dev_info = { .argsz = sizeof(dev_info) };
2051 int ret, fd;
2052
2053 fd = ioctl(group->fd, VFIO_GROUP_GET_DEVICE_FD, name);
2054 if (fd < 0) {
2055 error_setg_errno(errp, errno, "error getting device from group %d",
2056 group->groupid);
2057 error_append_hint(errp,
2058 "Verify all devices in group %d are bound to vfio-<bus> "
2059 "or pci-stub and not already in use\n", group->groupid);
2060 return fd;
2061 }
2062
2063 ret = ioctl(fd, VFIO_DEVICE_GET_INFO, &dev_info);
2064 if (ret) {
2065 error_setg_errno(errp, errno, "error getting device info");
2066 close(fd);
2067 return ret;
2068 }
2069
2070 /*
2071 * Set discarding of RAM as not broken for this group if the driver knows
2072 * the device operates compatibly with discarding. Setting must be
2073 * consistent per group, but since compatibility is really only possible
2074 * with mdev currently, we expect singleton groups.
2075 */
2076 if (vbasedev->ram_block_discard_allowed !=
2077 group->ram_block_discard_allowed) {
2078 if (!QLIST_EMPTY(&group->device_list)) {
2079 error_setg(errp, "Inconsistent setting of support for discarding "
2080 "RAM (e.g., balloon) within group");
2081 close(fd);
2082 return -1;
2083 }
2084
2085 if (!group->ram_block_discard_allowed) {
2086 group->ram_block_discard_allowed = true;
2087 ram_block_discard_disable(false);
2088 }
2089 }
2090
2091 vbasedev->fd = fd;
2092 vbasedev->group = group;
2093 QLIST_INSERT_HEAD(&group->device_list, vbasedev, next);
2094
2095 vbasedev->num_irqs = dev_info.num_irqs;
2096 vbasedev->num_regions = dev_info.num_regions;
2097 vbasedev->flags = dev_info.flags;
2098
2099 trace_vfio_get_device(name, dev_info.flags, dev_info.num_regions,
2100 dev_info.num_irqs);
2101
2102 vbasedev->reset_works = !!(dev_info.flags & VFIO_DEVICE_FLAGS_RESET);
2103 return 0;
2104 }
2105
2106 void vfio_put_base_device(VFIODevice *vbasedev)
2107 {
2108 if (!vbasedev->group) {
2109 return;
2110 }
2111 QLIST_REMOVE(vbasedev, next);
2112 vbasedev->group = NULL;
2113 trace_vfio_put_base_device(vbasedev->fd);
2114 close(vbasedev->fd);
2115 }
2116
2117 int vfio_get_region_info(VFIODevice *vbasedev, int index,
2118 struct vfio_region_info **info)
2119 {
2120 size_t argsz = sizeof(struct vfio_region_info);
2121
2122 *info = g_malloc0(argsz);
2123
2124 (*info)->index = index;
2125 retry:
2126 (*info)->argsz = argsz;
2127
2128 if (ioctl(vbasedev->fd, VFIO_DEVICE_GET_REGION_INFO, *info)) {
2129 g_free(*info);
2130 *info = NULL;
2131 return -errno;
2132 }
2133
2134 if ((*info)->argsz > argsz) {
2135 argsz = (*info)->argsz;
2136 *info = g_realloc(*info, argsz);
2137
2138 goto retry;
2139 }
2140
2141 return 0;
2142 }
2143
2144 int vfio_get_dev_region_info(VFIODevice *vbasedev, uint32_t type,
2145 uint32_t subtype, struct vfio_region_info **info)
2146 {
2147 int i;
2148
2149 for (i = 0; i < vbasedev->num_regions; i++) {
2150 struct vfio_info_cap_header *hdr;
2151 struct vfio_region_info_cap_type *cap_type;
2152
2153 if (vfio_get_region_info(vbasedev, i, info)) {
2154 continue;
2155 }
2156
2157 hdr = vfio_get_region_info_cap(*info, VFIO_REGION_INFO_CAP_TYPE);
2158 if (!hdr) {
2159 g_free(*info);
2160 continue;
2161 }
2162
2163 cap_type = container_of(hdr, struct vfio_region_info_cap_type, header);
2164
2165 trace_vfio_get_dev_region(vbasedev->name, i,
2166 cap_type->type, cap_type->subtype);
2167
2168 if (cap_type->type == type && cap_type->subtype == subtype) {
2169 return 0;
2170 }
2171
2172 g_free(*info);
2173 }
2174
2175 *info = NULL;
2176 return -ENODEV;
2177 }
2178
2179 bool vfio_has_region_cap(VFIODevice *vbasedev, int region, uint16_t cap_type)
2180 {
2181 struct vfio_region_info *info = NULL;
2182 bool ret = false;
2183
2184 if (!vfio_get_region_info(vbasedev, region, &info)) {
2185 if (vfio_get_region_info_cap(info, cap_type)) {
2186 ret = true;
2187 }
2188 g_free(info);
2189 }
2190
2191 return ret;
2192 }
2193
2194 /*
2195 * Interfaces for IBM EEH (Enhanced Error Handling)
2196 */
2197 static bool vfio_eeh_container_ok(VFIOContainer *container)
2198 {
2199 /*
2200 * As of 2016-03-04 (linux-4.5) the host kernel EEH/VFIO
2201 * implementation is broken if there are multiple groups in a
2202 * container. The hardware works in units of Partitionable
2203 * Endpoints (== IOMMU groups) and the EEH operations naively
2204 * iterate across all groups in the container, without any logic
2205 * to make sure the groups have their state synchronized. For
2206 * certain operations (ENABLE) that might be ok, until an error
2207 * occurs, but for others (GET_STATE) it's clearly broken.
2208 */
2209
2210 /*
2211 * XXX Once fixed kernels exist, test for them here
2212 */
2213
2214 if (QLIST_EMPTY(&container->group_list)) {
2215 return false;
2216 }
2217
2218 if (QLIST_NEXT(QLIST_FIRST(&container->group_list), container_next)) {
2219 return false;
2220 }
2221
2222 return true;
2223 }
2224
2225 static int vfio_eeh_container_op(VFIOContainer *container, uint32_t op)
2226 {
2227 struct vfio_eeh_pe_op pe_op = {
2228 .argsz = sizeof(pe_op),
2229 .op = op,
2230 };
2231 int ret;
2232
2233 if (!vfio_eeh_container_ok(container)) {
2234 error_report("vfio/eeh: EEH_PE_OP 0x%x: "
2235 "kernel requires a container with exactly one group", op);
2236 return -EPERM;
2237 }
2238
2239 ret = ioctl(container->fd, VFIO_EEH_PE_OP, &pe_op);
2240 if (ret < 0) {
2241 error_report("vfio/eeh: EEH_PE_OP 0x%x failed: %m", op);
2242 return -errno;
2243 }
2244
2245 return ret;
2246 }
2247
2248 static VFIOContainer *vfio_eeh_as_container(AddressSpace *as)
2249 {
2250 VFIOAddressSpace *space = vfio_get_address_space(as);
2251 VFIOContainer *container = NULL;
2252
2253 if (QLIST_EMPTY(&space->containers)) {
2254 /* No containers to act on */
2255 goto out;
2256 }
2257
2258 container = QLIST_FIRST(&space->containers);
2259
2260 if (QLIST_NEXT(container, next)) {
2261 /* We don't yet have logic to synchronize EEH state across
2262 * multiple containers */
2263 container = NULL;
2264 goto out;
2265 }
2266
2267 out:
2268 vfio_put_address_space(space);
2269 return container;
2270 }
2271
2272 bool vfio_eeh_as_ok(AddressSpace *as)
2273 {
2274 VFIOContainer *container = vfio_eeh_as_container(as);
2275
2276 return (container != NULL) && vfio_eeh_container_ok(container);
2277 }
2278
2279 int vfio_eeh_as_op(AddressSpace *as, uint32_t op)
2280 {
2281 VFIOContainer *container = vfio_eeh_as_container(as);
2282
2283 if (!container) {
2284 return -ENODEV;
2285 }
2286 return vfio_eeh_container_op(container, op);
2287 }
QEmu