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tests/acceptance/boot_linux: Accept SSH pubkey
[qemu.git] / hw / vfio / common.c
blobe18ea2cf91246275a1a2f6c804f8105232c77010
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_stopped_and_saving(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 ((migration->device_state & VFIO_DEVICE_STATE_SAVING) &&
333 !(migration->device_state & VFIO_DEVICE_STATE_RUNNING)) {
334 continue;
335 } else {
336 return false;
337 }
338 }
339 }
340 return true;
341 }
342
343 static bool vfio_devices_all_running_and_saving(VFIOContainer *container)
344 {
345 VFIOGroup *group;
346 VFIODevice *vbasedev;
347 MigrationState *ms = migrate_get_current();
348
349 if (!migration_is_setup_or_active(ms->state)) {
350 return false;
351 }
352
353 QLIST_FOREACH(group, &container->group_list, container_next) {
354 QLIST_FOREACH(vbasedev, &group->device_list, next) {
355 VFIOMigration *migration = vbasedev->migration;
356
357 if (!migration) {
358 return false;
359 }
360
361 if ((migration->device_state & VFIO_DEVICE_STATE_SAVING) &&
362 (migration->device_state & VFIO_DEVICE_STATE_RUNNING)) {
363 continue;
364 } else {
365 return false;
366 }
367 }
368 }
369 return true;
370 }
371
372 static int vfio_dma_unmap_bitmap(VFIOContainer *container,
373 hwaddr iova, ram_addr_t size,
374 IOMMUTLBEntry *iotlb)
375 {
376 struct vfio_iommu_type1_dma_unmap *unmap;
377 struct vfio_bitmap *bitmap;
378 uint64_t pages = TARGET_PAGE_ALIGN(size) >> TARGET_PAGE_BITS;
379 int ret;
380
381 unmap = g_malloc0(sizeof(*unmap) + sizeof(*bitmap));
382
383 unmap->argsz = sizeof(*unmap) + sizeof(*bitmap);
384 unmap->iova = iova;
385 unmap->size = size;
386 unmap->flags |= VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP;
387 bitmap = (struct vfio_bitmap *)&unmap->data;
388
389 /*
390 * cpu_physical_memory_set_dirty_lebitmap() expects pages in bitmap of
391 * TARGET_PAGE_SIZE to mark those dirty. Hence set bitmap_pgsize to
392 * TARGET_PAGE_SIZE.
393 */
394
395 bitmap->pgsize = TARGET_PAGE_SIZE;
396 bitmap->size = ROUND_UP(pages, sizeof(__u64) * BITS_PER_BYTE) /
397 BITS_PER_BYTE;
398
399 if (bitmap->size > container->max_dirty_bitmap_size) {
400 error_report("UNMAP: Size of bitmap too big 0x%"PRIx64,
401 (uint64_t)bitmap->size);
402 ret = -E2BIG;
403 goto unmap_exit;
404 }
405
406 bitmap->data = g_try_malloc0(bitmap->size);
407 if (!bitmap->data) {
408 ret = -ENOMEM;
409 goto unmap_exit;
410 }
411
412 ret = ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, unmap);
413 if (!ret) {
414 cpu_physical_memory_set_dirty_lebitmap((unsigned long *)bitmap->data,
415 iotlb->translated_addr, pages);
416 } else {
417 error_report("VFIO_UNMAP_DMA with DIRTY_BITMAP : %m");
418 }
419
420 g_free(bitmap->data);
421 unmap_exit:
422 g_free(unmap);
423 return ret;
424 }
425
426 /*
427 * DMA - Mapping and unmapping for the "type1" IOMMU interface used on x86
428 */
429 static int vfio_dma_unmap(VFIOContainer *container,
430 hwaddr iova, ram_addr_t size,
431 IOMMUTLBEntry *iotlb)
432 {
433 struct vfio_iommu_type1_dma_unmap unmap = {
434 .argsz = sizeof(unmap),
435 .flags = 0,
436 .iova = iova,
437 .size = size,
438 };
439
440 if (iotlb && container->dirty_pages_supported &&
441 vfio_devices_all_running_and_saving(container)) {
442 return vfio_dma_unmap_bitmap(container, iova, size, iotlb);
443 }
444
445 while (ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, &unmap)) {
446 /*
447 * The type1 backend has an off-by-one bug in the kernel (71a7d3d78e3c
448 * v4.15) where an overflow in its wrap-around check prevents us from
449 * unmapping the last page of the address space. Test for the error
450 * condition and re-try the unmap excluding the last page. The
451 * expectation is that we've never mapped the last page anyway and this
452 * unmap request comes via vIOMMU support which also makes it unlikely
453 * that this page is used. This bug was introduced well after type1 v2
454 * support was introduced, so we shouldn't need to test for v1. A fix
455 * is queued for kernel v5.0 so this workaround can be removed once
456 * affected kernels are sufficiently deprecated.
457 */
458 if (errno == EINVAL && unmap.size && !(unmap.iova + unmap.size) &&
459 container->iommu_type == VFIO_TYPE1v2_IOMMU) {
460 trace_vfio_dma_unmap_overflow_workaround();
461 unmap.size -= 1ULL << ctz64(container->pgsizes);
462 continue;
463 }
464 error_report("VFIO_UNMAP_DMA failed: %s", strerror(errno));
465 return -errno;
466 }
467
468 return 0;
469 }
470
471 static int vfio_dma_map(VFIOContainer *container, hwaddr iova,
472 ram_addr_t size, void *vaddr, bool readonly)
473 {
474 struct vfio_iommu_type1_dma_map map = {
475 .argsz = sizeof(map),
476 .flags = VFIO_DMA_MAP_FLAG_READ,
477 .vaddr = (__u64)(uintptr_t)vaddr,
478 .iova = iova,
479 .size = size,
480 };
481
482 if (!readonly) {
483 map.flags |= VFIO_DMA_MAP_FLAG_WRITE;
484 }
485
486 /*
487 * Try the mapping, if it fails with EBUSY, unmap the region and try
488 * again. This shouldn't be necessary, but we sometimes see it in
489 * the VGA ROM space.
490 */
491 if (ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0 ||
492 (errno == EBUSY && vfio_dma_unmap(container, iova, size, NULL) == 0 &&
493 ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0)) {
494 return 0;
495 }
496
497 error_report("VFIO_MAP_DMA failed: %s", strerror(errno));
498 return -errno;
499 }
500
501 static void vfio_host_win_add(VFIOContainer *container,
502 hwaddr min_iova, hwaddr max_iova,
503 uint64_t iova_pgsizes)
504 {
505 VFIOHostDMAWindow *hostwin;
506
507 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) {
508 if (ranges_overlap(hostwin->min_iova,
509 hostwin->max_iova - hostwin->min_iova + 1,
510 min_iova,
511 max_iova - min_iova + 1)) {
512 hw_error("%s: Overlapped IOMMU are not enabled", __func__);
513 }
514 }
515
516 hostwin = g_malloc0(sizeof(*hostwin));
517
518 hostwin->min_iova = min_iova;
519 hostwin->max_iova = max_iova;
520 hostwin->iova_pgsizes = iova_pgsizes;
521 QLIST_INSERT_HEAD(&container->hostwin_list, hostwin, hostwin_next);
522 }
523
524 static int vfio_host_win_del(VFIOContainer *container, hwaddr min_iova,
525 hwaddr max_iova)
526 {
527 VFIOHostDMAWindow *hostwin;
528
529 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) {
530 if (hostwin->min_iova == min_iova && hostwin->max_iova == max_iova) {
531 QLIST_REMOVE(hostwin, hostwin_next);
532 return 0;
533 }
534 }
535
536 return -1;
537 }
538
539 static bool vfio_listener_skipped_section(MemoryRegionSection *section)
540 {
541 return (!memory_region_is_ram(section->mr) &&
542 !memory_region_is_iommu(section->mr)) ||
543 /*
544 * Sizing an enabled 64-bit BAR can cause spurious mappings to
545 * addresses in the upper part of the 64-bit address space. These
546 * are never accessed by the CPU and beyond the address width of
547 * some IOMMU hardware. TODO: VFIO should tell us the IOMMU width.
548 */
549 section->offset_within_address_space & (1ULL << 63);
550 }
551
552 /* Called with rcu_read_lock held. */
553 static bool vfio_get_xlat_addr(IOMMUTLBEntry *iotlb, void **vaddr,
554 ram_addr_t *ram_addr, bool *read_only)
555 {
556 MemoryRegion *mr;
557 hwaddr xlat;
558 hwaddr len = iotlb->addr_mask + 1;
559 bool writable = iotlb->perm & IOMMU_WO;
560
561 /*
562 * The IOMMU TLB entry we have just covers translation through
563 * this IOMMU to its immediate target. We need to translate
564 * it the rest of the way through to memory.
565 */
566 mr = address_space_translate(&address_space_memory,
567 iotlb->translated_addr,
568 &xlat, &len, writable,
569 MEMTXATTRS_UNSPECIFIED);
570 if (!memory_region_is_ram(mr)) {
571 error_report("iommu map to non memory area %"HWADDR_PRIx"",
572 xlat);
573 return false;
574 }
575
576 /*
577 * Translation truncates length to the IOMMU page size,
578 * check that it did not truncate too much.
579 */
580 if (len & iotlb->addr_mask) {
581 error_report("iommu has granularity incompatible with target AS");
582 return false;
583 }
584
585 if (vaddr) {
586 *vaddr = memory_region_get_ram_ptr(mr) + xlat;
587 }
588
589 if (ram_addr) {
590 *ram_addr = memory_region_get_ram_addr(mr) + xlat;
591 }
592
593 if (read_only) {
594 *read_only = !writable || mr->readonly;
595 }
596
597 return true;
598 }
599
600 static void vfio_iommu_map_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb)
601 {
602 VFIOGuestIOMMU *giommu = container_of(n, VFIOGuestIOMMU, n);
603 VFIOContainer *container = giommu->container;
604 hwaddr iova = iotlb->iova + giommu->iommu_offset;
605 void *vaddr;
606 int ret;
607
608 trace_vfio_iommu_map_notify(iotlb->perm == IOMMU_NONE ? "UNMAP" : "MAP",
609 iova, iova + iotlb->addr_mask);
610
611 if (iotlb->target_as != &address_space_memory) {
612 error_report("Wrong target AS \"%s\", only system memory is allowed",
613 iotlb->target_as->name ? iotlb->target_as->name : "none");
614 return;
615 }
616
617 rcu_read_lock();
618
619 if ((iotlb->perm & IOMMU_RW) != IOMMU_NONE) {
620 bool read_only;
621
622 if (!vfio_get_xlat_addr(iotlb, &vaddr, NULL, &read_only)) {
623 goto out;
624 }
625 /*
626 * vaddr is only valid until rcu_read_unlock(). But after
627 * vfio_dma_map has set up the mapping the pages will be
628 * pinned by the kernel. This makes sure that the RAM backend
629 * of vaddr will always be there, even if the memory object is
630 * destroyed and its backing memory munmap-ed.
631 */
632 ret = vfio_dma_map(container, iova,
633 iotlb->addr_mask + 1, vaddr,
634 read_only);
635 if (ret) {
636 error_report("vfio_dma_map(%p, 0x%"HWADDR_PRIx", "
637 "0x%"HWADDR_PRIx", %p) = %d (%m)",
638 container, iova,
639 iotlb->addr_mask + 1, vaddr, ret);
640 }
641 } else {
642 ret = vfio_dma_unmap(container, iova, iotlb->addr_mask + 1, iotlb);
643 if (ret) {
644 error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", "
645 "0x%"HWADDR_PRIx") = %d (%m)",
646 container, iova,
647 iotlb->addr_mask + 1, ret);
648 }
649 }
650 out:
651 rcu_read_unlock();
652 }
653
654 static void vfio_listener_region_add(MemoryListener *listener,
655 MemoryRegionSection *section)
656 {
657 VFIOContainer *container = container_of(listener, VFIOContainer, listener);
658 hwaddr iova, end;
659 Int128 llend, llsize;
660 void *vaddr;
661 int ret;
662 VFIOHostDMAWindow *hostwin;
663 bool hostwin_found;
664 Error *err = NULL;
665
666 if (vfio_listener_skipped_section(section)) {
667 trace_vfio_listener_region_add_skip(
668 section->offset_within_address_space,
669 section->offset_within_address_space +
670 int128_get64(int128_sub(section->size, int128_one())));
671 return;
672 }
673
674 if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) !=
675 (section->offset_within_region & ~TARGET_PAGE_MASK))) {
676 error_report("%s received unaligned region", __func__);
677 return;
678 }
679
680 iova = TARGET_PAGE_ALIGN(section->offset_within_address_space);
681 llend = int128_make64(section->offset_within_address_space);
682 llend = int128_add(llend, section->size);
683 llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK));
684
685 if (int128_ge(int128_make64(iova), llend)) {
686 return;
687 }
688 end = int128_get64(int128_sub(llend, int128_one()));
689
690 if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) {
691 hwaddr pgsize = 0;
692
693 /* For now intersections are not allowed, we may relax this later */
694 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) {
695 if (ranges_overlap(hostwin->min_iova,
696 hostwin->max_iova - hostwin->min_iova + 1,
697 section->offset_within_address_space,
698 int128_get64(section->size))) {
699 error_setg(&err,
700 "region [0x%"PRIx64",0x%"PRIx64"] overlaps with existing"
701 "host DMA window [0x%"PRIx64",0x%"PRIx64"]",
702 section->offset_within_address_space,
703 section->offset_within_address_space +
704 int128_get64(section->size) - 1,
705 hostwin->min_iova, hostwin->max_iova);
706 goto fail;
707 }
708 }
709
710 ret = vfio_spapr_create_window(container, section, &pgsize);
711 if (ret) {
712 error_setg_errno(&err, -ret, "Failed to create SPAPR window");
713 goto fail;
714 }
715
716 vfio_host_win_add(container, section->offset_within_address_space,
717 section->offset_within_address_space +
718 int128_get64(section->size) - 1, pgsize);
719 #ifdef CONFIG_KVM
720 if (kvm_enabled()) {
721 VFIOGroup *group;
722 IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(section->mr);
723 struct kvm_vfio_spapr_tce param;
724 struct kvm_device_attr attr = {
725 .group = KVM_DEV_VFIO_GROUP,
726 .attr = KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE,
727 .addr = (uint64_t)(unsigned long)&param,
728 };
729
730 if (!memory_region_iommu_get_attr(iommu_mr, IOMMU_ATTR_SPAPR_TCE_FD,
731 &param.tablefd)) {
732 QLIST_FOREACH(group, &container->group_list, container_next) {
733 param.groupfd = group->fd;
734 if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) {
735 error_report("vfio: failed to setup fd %d "
736 "for a group with fd %d: %s",
737 param.tablefd, param.groupfd,
738 strerror(errno));
739 return;
740 }
741 trace_vfio_spapr_group_attach(param.groupfd, param.tablefd);
742 }
743 }
744 }
745 #endif
746 }
747
748 hostwin_found = false;
749 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) {
750 if (hostwin->min_iova <= iova && end <= hostwin->max_iova) {
751 hostwin_found = true;
752 break;
753 }
754 }
755
756 if (!hostwin_found) {
757 error_setg(&err, "Container %p can't map guest IOVA region"
758 " 0x%"HWADDR_PRIx"..0x%"HWADDR_PRIx, container, iova, end);
759 goto fail;
760 }
761
762 memory_region_ref(section->mr);
763
764 if (memory_region_is_iommu(section->mr)) {
765 VFIOGuestIOMMU *giommu;
766 IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(section->mr);
767 int iommu_idx;
768
769 trace_vfio_listener_region_add_iommu(iova, end);
770 /*
771 * FIXME: For VFIO iommu types which have KVM acceleration to
772 * avoid bouncing all map/unmaps through qemu this way, this
773 * would be the right place to wire that up (tell the KVM
774 * device emulation the VFIO iommu handles to use).
775 */
776 giommu = g_malloc0(sizeof(*giommu));
777 giommu->iommu = iommu_mr;
778 giommu->iommu_offset = section->offset_within_address_space -
779 section->offset_within_region;
780 giommu->container = container;
781 llend = int128_add(int128_make64(section->offset_within_region),
782 section->size);
783 llend = int128_sub(llend, int128_one());
784 iommu_idx = memory_region_iommu_attrs_to_index(iommu_mr,
785 MEMTXATTRS_UNSPECIFIED);
786 iommu_notifier_init(&giommu->n, vfio_iommu_map_notify,
787 IOMMU_NOTIFIER_ALL,
788 section->offset_within_region,
789 int128_get64(llend),
790 iommu_idx);
791
792 ret = memory_region_register_iommu_notifier(section->mr, &giommu->n,
793 &err);
794 if (ret) {
795 g_free(giommu);
796 goto fail;
797 }
798 QLIST_INSERT_HEAD(&container->giommu_list, giommu, giommu_next);
799 memory_region_iommu_replay(giommu->iommu, &giommu->n);
800
801 return;
802 }
803
804 /* Here we assume that memory_region_is_ram(section->mr)==true */
805
806 vaddr = memory_region_get_ram_ptr(section->mr) +
807 section->offset_within_region +
808 (iova - section->offset_within_address_space);
809
810 trace_vfio_listener_region_add_ram(iova, end, vaddr);
811
812 llsize = int128_sub(llend, int128_make64(iova));
813
814 if (memory_region_is_ram_device(section->mr)) {
815 hwaddr pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1;
816
817 if ((iova & pgmask) || (int128_get64(llsize) & pgmask)) {
818 trace_vfio_listener_region_add_no_dma_map(
819 memory_region_name(section->mr),
820 section->offset_within_address_space,
821 int128_getlo(section->size),
822 pgmask + 1);
823 return;
824 }
825 }
826
827 ret = vfio_dma_map(container, iova, int128_get64(llsize),
828 vaddr, section->readonly);
829 if (ret) {
830 error_setg(&err, "vfio_dma_map(%p, 0x%"HWADDR_PRIx", "
831 "0x%"HWADDR_PRIx", %p) = %d (%m)",
832 container, iova, int128_get64(llsize), vaddr, ret);
833 if (memory_region_is_ram_device(section->mr)) {
834 /* Allow unexpected mappings not to be fatal for RAM devices */
835 error_report_err(err);
836 return;
837 }
838 goto fail;
839 }
840
841 return;
842
843 fail:
844 if (memory_region_is_ram_device(section->mr)) {
845 error_report("failed to vfio_dma_map. pci p2p may not work");
846 return;
847 }
848 /*
849 * On the initfn path, store the first error in the container so we
850 * can gracefully fail. Runtime, there's not much we can do other
851 * than throw a hardware error.
852 */
853 if (!container->initialized) {
854 if (!container->error) {
855 error_propagate_prepend(&container->error, err,
856 "Region %s: ",
857 memory_region_name(section->mr));
858 } else {
859 error_free(err);
860 }
861 } else {
862 error_report_err(err);
863 hw_error("vfio: DMA mapping failed, unable to continue");
864 }
865 }
866
867 static void vfio_listener_region_del(MemoryListener *listener,
868 MemoryRegionSection *section)
869 {
870 VFIOContainer *container = container_of(listener, VFIOContainer, listener);
871 hwaddr iova, end;
872 Int128 llend, llsize;
873 int ret;
874 bool try_unmap = true;
875
876 if (vfio_listener_skipped_section(section)) {
877 trace_vfio_listener_region_del_skip(
878 section->offset_within_address_space,
879 section->offset_within_address_space +
880 int128_get64(int128_sub(section->size, int128_one())));
881 return;
882 }
883
884 if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) !=
885 (section->offset_within_region & ~TARGET_PAGE_MASK))) {
886 error_report("%s received unaligned region", __func__);
887 return;
888 }
889
890 if (memory_region_is_iommu(section->mr)) {
891 VFIOGuestIOMMU *giommu;
892
893 QLIST_FOREACH(giommu, &container->giommu_list, giommu_next) {
894 if (MEMORY_REGION(giommu->iommu) == section->mr &&
895 giommu->n.start == section->offset_within_region) {
896 memory_region_unregister_iommu_notifier(section->mr,
897 &giommu->n);
898 QLIST_REMOVE(giommu, giommu_next);
899 g_free(giommu);
900 break;
901 }
902 }
903
904 /*
905 * FIXME: We assume the one big unmap below is adequate to
906 * remove any individual page mappings in the IOMMU which
907 * might have been copied into VFIO. This works for a page table
908 * based IOMMU where a big unmap flattens a large range of IO-PTEs.
909 * That may not be true for all IOMMU types.
910 */
911 }
912
913 iova = TARGET_PAGE_ALIGN(section->offset_within_address_space);
914 llend = int128_make64(section->offset_within_address_space);
915 llend = int128_add(llend, section->size);
916 llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK));
917
918 if (int128_ge(int128_make64(iova), llend)) {
919 return;
920 }
921 end = int128_get64(int128_sub(llend, int128_one()));
922
923 llsize = int128_sub(llend, int128_make64(iova));
924
925 trace_vfio_listener_region_del(iova, end);
926
927 if (memory_region_is_ram_device(section->mr)) {
928 hwaddr pgmask;
929 VFIOHostDMAWindow *hostwin;
930 bool hostwin_found = false;
931
932 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) {
933 if (hostwin->min_iova <= iova && end <= hostwin->max_iova) {
934 hostwin_found = true;
935 break;
936 }
937 }
938 assert(hostwin_found); /* or region_add() would have failed */
939
940 pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1;
941 try_unmap = !((iova & pgmask) || (int128_get64(llsize) & pgmask));
942 }
943
944 if (try_unmap) {
945 ret = vfio_dma_unmap(container, iova, int128_get64(llsize), NULL);
946 if (ret) {
947 error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", "
948 "0x%"HWADDR_PRIx") = %d (%m)",
949 container, iova, int128_get64(llsize), ret);
950 }
951 }
952
953 memory_region_unref(section->mr);
954
955 if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) {
956 vfio_spapr_remove_window(container,
957 section->offset_within_address_space);
958 if (vfio_host_win_del(container,
959 section->offset_within_address_space,
960 section->offset_within_address_space +
961 int128_get64(section->size) - 1) < 0) {
962 hw_error("%s: Cannot delete missing window at %"HWADDR_PRIx,
963 __func__, section->offset_within_address_space);
964 }
965 }
966 }
967
968 static int vfio_get_dirty_bitmap(VFIOContainer *container, uint64_t iova,
969 uint64_t size, ram_addr_t ram_addr)
970 {
971 struct vfio_iommu_type1_dirty_bitmap *dbitmap;
972 struct vfio_iommu_type1_dirty_bitmap_get *range;
973 uint64_t pages;
974 int ret;
975
976 dbitmap = g_malloc0(sizeof(*dbitmap) + sizeof(*range));
977
978 dbitmap->argsz = sizeof(*dbitmap) + sizeof(*range);
979 dbitmap->flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_GET_BITMAP;
980 range = (struct vfio_iommu_type1_dirty_bitmap_get *)&dbitmap->data;
981 range->iova = iova;
982 range->size = size;
983
984 /*
985 * cpu_physical_memory_set_dirty_lebitmap() expects pages in bitmap of
986 * TARGET_PAGE_SIZE to mark those dirty. Hence set bitmap's pgsize to
987 * TARGET_PAGE_SIZE.
988 */
989 range->bitmap.pgsize = TARGET_PAGE_SIZE;
990
991 pages = TARGET_PAGE_ALIGN(range->size) >> TARGET_PAGE_BITS;
992 range->bitmap.size = ROUND_UP(pages, sizeof(__u64) * BITS_PER_BYTE) /
993 BITS_PER_BYTE;
994 range->bitmap.data = g_try_malloc0(range->bitmap.size);
995 if (!range->bitmap.data) {
996 ret = -ENOMEM;
997 goto err_out;
998 }
999
1000 ret = ioctl(container->fd, VFIO_IOMMU_DIRTY_PAGES, dbitmap);
1001 if (ret) {
1002 error_report("Failed to get dirty bitmap for iova: 0x%"PRIx64
1003 " size: 0x%"PRIx64" err: %d", (uint64_t)range->iova,
1004 (uint64_t)range->size, errno);
1005 goto err_out;
1006 }
1007
1008 cpu_physical_memory_set_dirty_lebitmap((unsigned long *)range->bitmap.data,
1009 ram_addr, pages);
1010
1011 trace_vfio_get_dirty_bitmap(container->fd, range->iova, range->size,
1012 range->bitmap.size, ram_addr);
1013 err_out:
1014 g_free(range->bitmap.data);
1015 g_free(dbitmap);
1016
1017 return ret;
1018 }
1019
1020 typedef struct {
1021 IOMMUNotifier n;
1022 VFIOGuestIOMMU *giommu;
1023 } vfio_giommu_dirty_notifier;
1024
1025 static void vfio_iommu_map_dirty_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb)
1026 {
1027 vfio_giommu_dirty_notifier *gdn = container_of(n,
1028 vfio_giommu_dirty_notifier, n);
1029 VFIOGuestIOMMU *giommu = gdn->giommu;
1030 VFIOContainer *container = giommu->container;
1031 hwaddr iova = iotlb->iova + giommu->iommu_offset;
1032 ram_addr_t translated_addr;
1033
1034 trace_vfio_iommu_map_dirty_notify(iova, iova + iotlb->addr_mask);
1035
1036 if (iotlb->target_as != &address_space_memory) {
1037 error_report("Wrong target AS \"%s\", only system memory is allowed",
1038 iotlb->target_as->name ? iotlb->target_as->name : "none");
1039 return;
1040 }
1041
1042 rcu_read_lock();
1043 if (vfio_get_xlat_addr(iotlb, NULL, &translated_addr, NULL)) {
1044 int ret;
1045
1046 ret = vfio_get_dirty_bitmap(container, iova, iotlb->addr_mask + 1,
1047 translated_addr);
1048 if (ret) {
1049 error_report("vfio_iommu_map_dirty_notify(%p, 0x%"HWADDR_PRIx", "
1050 "0x%"HWADDR_PRIx") = %d (%m)",
1051 container, iova,
1052 iotlb->addr_mask + 1, ret);
1053 }
1054 }
1055 rcu_read_unlock();
1056 }
1057
1058 static int vfio_sync_dirty_bitmap(VFIOContainer *container,
1059 MemoryRegionSection *section)
1060 {
1061 ram_addr_t ram_addr;
1062
1063 if (memory_region_is_iommu(section->mr)) {
1064 VFIOGuestIOMMU *giommu;
1065
1066 QLIST_FOREACH(giommu, &container->giommu_list, giommu_next) {
1067 if (MEMORY_REGION(giommu->iommu) == section->mr &&
1068 giommu->n.start == section->offset_within_region) {
1069 Int128 llend;
1070 vfio_giommu_dirty_notifier gdn = { .giommu = giommu };
1071 int idx = memory_region_iommu_attrs_to_index(giommu->iommu,
1072 MEMTXATTRS_UNSPECIFIED);
1073
1074 llend = int128_add(int128_make64(section->offset_within_region),
1075 section->size);
1076 llend = int128_sub(llend, int128_one());
1077
1078 iommu_notifier_init(&gdn.n,
1079 vfio_iommu_map_dirty_notify,
1080 IOMMU_NOTIFIER_MAP,
1081 section->offset_within_region,
1082 int128_get64(llend),
1083 idx);
1084 memory_region_iommu_replay(giommu->iommu, &gdn.n);
1085 break;
1086 }
1087 }
1088 return 0;
1089 }
1090
1091 ram_addr = memory_region_get_ram_addr(section->mr) +
1092 section->offset_within_region;
1093
1094 return vfio_get_dirty_bitmap(container,
1095 TARGET_PAGE_ALIGN(section->offset_within_address_space),
1096 int128_get64(section->size), ram_addr);
1097 }
1098
1099 static void vfio_listerner_log_sync(MemoryListener *listener,
1100 MemoryRegionSection *section)
1101 {
1102 VFIOContainer *container = container_of(listener, VFIOContainer, listener);
1103
1104 if (vfio_listener_skipped_section(section) ||
1105 !container->dirty_pages_supported) {
1106 return;
1107 }
1108
1109 if (vfio_devices_all_stopped_and_saving(container)) {
1110 vfio_sync_dirty_bitmap(container, section);
1111 }
1112 }
1113
1114 static const MemoryListener vfio_memory_listener = {
1115 .region_add = vfio_listener_region_add,
1116 .region_del = vfio_listener_region_del,
1117 .log_sync = vfio_listerner_log_sync,
1118 };
1119
1120 static void vfio_listener_release(VFIOContainer *container)
1121 {
1122 memory_listener_unregister(&container->listener);
1123 if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) {
1124 memory_listener_unregister(&container->prereg_listener);
1125 }
1126 }
1127
1128 static struct vfio_info_cap_header *
1129 vfio_get_cap(void *ptr, uint32_t cap_offset, uint16_t id)
1130 {
1131 struct vfio_info_cap_header *hdr;
1132
1133 for (hdr = ptr + cap_offset; hdr != ptr; hdr = ptr + hdr->next) {
1134 if (hdr->id == id) {
1135 return hdr;
1136 }
1137 }
1138
1139 return NULL;
1140 }
1141
1142 struct vfio_info_cap_header *
1143 vfio_get_region_info_cap(struct vfio_region_info *info, uint16_t id)
1144 {
1145 if (!(info->flags & VFIO_REGION_INFO_FLAG_CAPS)) {
1146 return NULL;
1147 }
1148
1149 return vfio_get_cap((void *)info, info->cap_offset, id);
1150 }
1151
1152 static struct vfio_info_cap_header *
1153 vfio_get_iommu_type1_info_cap(struct vfio_iommu_type1_info *info, uint16_t id)
1154 {
1155 if (!(info->flags & VFIO_IOMMU_INFO_CAPS)) {
1156 return NULL;
1157 }
1158
1159 return vfio_get_cap((void *)info, info->cap_offset, id);
1160 }
1161
1162 struct vfio_info_cap_header *
1163 vfio_get_device_info_cap(struct vfio_device_info *info, uint16_t id)
1164 {
1165 if (!(info->flags & VFIO_DEVICE_FLAGS_CAPS)) {
1166 return NULL;
1167 }
1168
1169 return vfio_get_cap((void *)info, info->cap_offset, id);
1170 }
1171
1172 bool vfio_get_info_dma_avail(struct vfio_iommu_type1_info *info,
1173 unsigned int *avail)
1174 {
1175 struct vfio_info_cap_header *hdr;
1176 struct vfio_iommu_type1_info_dma_avail *cap;
1177
1178 /* If the capability cannot be found, assume no DMA limiting */
1179 hdr = vfio_get_iommu_type1_info_cap(info,
1180 VFIO_IOMMU_TYPE1_INFO_DMA_AVAIL);
1181 if (hdr == NULL) {
1182 return false;
1183 }
1184
1185 if (avail != NULL) {
1186 cap = (void *) hdr;
1187 *avail = cap->avail;
1188 }
1189
1190 return true;
1191 }
1192
1193 static int vfio_setup_region_sparse_mmaps(VFIORegion *region,
1194 struct vfio_region_info *info)
1195 {
1196 struct vfio_info_cap_header *hdr;
1197 struct vfio_region_info_cap_sparse_mmap *sparse;
1198 int i, j;
1199
1200 hdr = vfio_get_region_info_cap(info, VFIO_REGION_INFO_CAP_SPARSE_MMAP);
1201 if (!hdr) {
1202 return -ENODEV;
1203 }
1204
1205 sparse = container_of(hdr, struct vfio_region_info_cap_sparse_mmap, header);
1206
1207 trace_vfio_region_sparse_mmap_header(region->vbasedev->name,
1208 region->nr, sparse->nr_areas);
1209
1210 region->mmaps = g_new0(VFIOMmap, sparse->nr_areas);
1211
1212 for (i = 0, j = 0; i < sparse->nr_areas; i++) {
1213 trace_vfio_region_sparse_mmap_entry(i, sparse->areas[i].offset,
1214 sparse->areas[i].offset +
1215 sparse->areas[i].size);
1216
1217 if (sparse->areas[i].size) {
1218 region->mmaps[j].offset = sparse->areas[i].offset;
1219 region->mmaps[j].size = sparse->areas[i].size;
1220 j++;
1221 }
1222 }
1223
1224 region->nr_mmaps = j;
1225 region->mmaps = g_realloc(region->mmaps, j * sizeof(VFIOMmap));
1226
1227 return 0;
1228 }
1229
1230 int vfio_region_setup(Object *obj, VFIODevice *vbasedev, VFIORegion *region,
1231 int index, const char *name)
1232 {
1233 struct vfio_region_info *info;
1234 int ret;
1235
1236 ret = vfio_get_region_info(vbasedev, index, &info);
1237 if (ret) {
1238 return ret;
1239 }
1240
1241 region->vbasedev = vbasedev;
1242 region->flags = info->flags;
1243 region->size = info->size;
1244 region->fd_offset = info->offset;
1245 region->nr = index;
1246
1247 if (region->size) {
1248 region->mem = g_new0(MemoryRegion, 1);
1249 memory_region_init_io(region->mem, obj, &vfio_region_ops,
1250 region, name, region->size);
1251
1252 if (!vbasedev->no_mmap &&
1253 region->flags & VFIO_REGION_INFO_FLAG_MMAP) {
1254
1255 ret = vfio_setup_region_sparse_mmaps(region, info);
1256
1257 if (ret) {
1258 region->nr_mmaps = 1;
1259 region->mmaps = g_new0(VFIOMmap, region->nr_mmaps);
1260 region->mmaps[0].offset = 0;
1261 region->mmaps[0].size = region->size;
1262 }
1263 }
1264 }
1265
1266 g_free(info);
1267
1268 trace_vfio_region_setup(vbasedev->name, index, name,
1269 region->flags, region->fd_offset, region->size);
1270 return 0;
1271 }
1272
1273 static void vfio_subregion_unmap(VFIORegion *region, int index)
1274 {
1275 trace_vfio_region_unmap(memory_region_name(&region->mmaps[index].mem),
1276 region->mmaps[index].offset,
1277 region->mmaps[index].offset +
1278 region->mmaps[index].size - 1);
1279 memory_region_del_subregion(region->mem, &region->mmaps[index].mem);
1280 munmap(region->mmaps[index].mmap, region->mmaps[index].size);
1281 object_unparent(OBJECT(&region->mmaps[index].mem));
1282 region->mmaps[index].mmap = NULL;
1283 }
1284
1285 int vfio_region_mmap(VFIORegion *region)
1286 {
1287 int i, prot = 0;
1288 char *name;
1289
1290 if (!region->mem) {
1291 return 0;
1292 }
1293
1294 prot |= region->flags & VFIO_REGION_INFO_FLAG_READ ? PROT_READ : 0;
1295 prot |= region->flags & VFIO_REGION_INFO_FLAG_WRITE ? PROT_WRITE : 0;
1296
1297 for (i = 0; i < region->nr_mmaps; i++) {
1298 region->mmaps[i].mmap = mmap(NULL, region->mmaps[i].size, prot,
1299 MAP_SHARED, region->vbasedev->fd,
1300 region->fd_offset +
1301 region->mmaps[i].offset);
1302 if (region->mmaps[i].mmap == MAP_FAILED) {
1303 int ret = -errno;
1304
1305 trace_vfio_region_mmap_fault(memory_region_name(region->mem), i,
1306 region->fd_offset +
1307 region->mmaps[i].offset,
1308 region->fd_offset +
1309 region->mmaps[i].offset +
1310 region->mmaps[i].size - 1, ret);
1311
1312 region->mmaps[i].mmap = NULL;
1313
1314 for (i--; i >= 0; i--) {
1315 vfio_subregion_unmap(region, i);
1316 }
1317
1318 return ret;
1319 }
1320
1321 name = g_strdup_printf("%s mmaps[%d]",
1322 memory_region_name(region->mem), i);
1323 memory_region_init_ram_device_ptr(&region->mmaps[i].mem,
1324 memory_region_owner(region->mem),
1325 name, region->mmaps[i].size,
1326 region->mmaps[i].mmap);
1327 g_free(name);
1328 memory_region_add_subregion(region->mem, region->mmaps[i].offset,
1329 &region->mmaps[i].mem);
1330
1331 trace_vfio_region_mmap(memory_region_name(&region->mmaps[i].mem),
1332 region->mmaps[i].offset,
1333 region->mmaps[i].offset +
1334 region->mmaps[i].size - 1);
1335 }
1336
1337 return 0;
1338 }
1339
1340 void vfio_region_unmap(VFIORegion *region)
1341 {
1342 int i;
1343
1344 if (!region->mem) {
1345 return;
1346 }
1347
1348 for (i = 0; i < region->nr_mmaps; i++) {
1349 if (region->mmaps[i].mmap) {
1350 vfio_subregion_unmap(region, i);
1351 }
1352 }
1353 }
1354
1355 void vfio_region_exit(VFIORegion *region)
1356 {
1357 int i;
1358
1359 if (!region->mem) {
1360 return;
1361 }
1362
1363 for (i = 0; i < region->nr_mmaps; i++) {
1364 if (region->mmaps[i].mmap) {
1365 memory_region_del_subregion(region->mem, &region->mmaps[i].mem);
1366 }
1367 }
1368
1369 trace_vfio_region_exit(region->vbasedev->name, region->nr);
1370 }
1371
1372 void vfio_region_finalize(VFIORegion *region)
1373 {
1374 int i;
1375
1376 if (!region->mem) {
1377 return;
1378 }
1379
1380 for (i = 0; i < region->nr_mmaps; i++) {
1381 if (region->mmaps[i].mmap) {
1382 munmap(region->mmaps[i].mmap, region->mmaps[i].size);
1383 object_unparent(OBJECT(&region->mmaps[i].mem));
1384 }
1385 }
1386
1387 object_unparent(OBJECT(region->mem));
1388
1389 g_free(region->mem);
1390 g_free(region->mmaps);
1391
1392 trace_vfio_region_finalize(region->vbasedev->name, region->nr);
1393
1394 region->mem = NULL;
1395 region->mmaps = NULL;
1396 region->nr_mmaps = 0;
1397 region->size = 0;
1398 region->flags = 0;
1399 region->nr = 0;
1400 }
1401
1402 void vfio_region_mmaps_set_enabled(VFIORegion *region, bool enabled)
1403 {
1404 int i;
1405
1406 if (!region->mem) {
1407 return;
1408 }
1409
1410 for (i = 0; i < region->nr_mmaps; i++) {
1411 if (region->mmaps[i].mmap) {
1412 memory_region_set_enabled(&region->mmaps[i].mem, enabled);
1413 }
1414 }
1415
1416 trace_vfio_region_mmaps_set_enabled(memory_region_name(region->mem),
1417 enabled);
1418 }
1419
1420 void vfio_reset_handler(void *opaque)
1421 {
1422 VFIOGroup *group;
1423 VFIODevice *vbasedev;
1424
1425 QLIST_FOREACH(group, &vfio_group_list, next) {
1426 QLIST_FOREACH(vbasedev, &group->device_list, next) {
1427 if (vbasedev->dev->realized) {
1428 vbasedev->ops->vfio_compute_needs_reset(vbasedev);
1429 }
1430 }
1431 }
1432
1433 QLIST_FOREACH(group, &vfio_group_list, next) {
1434 QLIST_FOREACH(vbasedev, &group->device_list, next) {
1435 if (vbasedev->dev->realized && vbasedev->needs_reset) {
1436 vbasedev->ops->vfio_hot_reset_multi(vbasedev);
1437 }
1438 }
1439 }
1440 }
1441
1442 static void vfio_kvm_device_add_group(VFIOGroup *group)
1443 {
1444 #ifdef CONFIG_KVM
1445 struct kvm_device_attr attr = {
1446 .group = KVM_DEV_VFIO_GROUP,
1447 .attr = KVM_DEV_VFIO_GROUP_ADD,
1448 .addr = (uint64_t)(unsigned long)&group->fd,
1449 };
1450
1451 if (!kvm_enabled()) {
1452 return;
1453 }
1454
1455 if (vfio_kvm_device_fd < 0) {
1456 struct kvm_create_device cd = {
1457 .type = KVM_DEV_TYPE_VFIO,
1458 };
1459
1460 if (kvm_vm_ioctl(kvm_state, KVM_CREATE_DEVICE, &cd)) {
1461 error_report("Failed to create KVM VFIO device: %m");
1462 return;
1463 }
1464
1465 vfio_kvm_device_fd = cd.fd;
1466 }
1467
1468 if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) {
1469 error_report("Failed to add group %d to KVM VFIO device: %m",
1470 group->groupid);
1471 }
1472 #endif
1473 }
1474
1475 static void vfio_kvm_device_del_group(VFIOGroup *group)
1476 {
1477 #ifdef CONFIG_KVM
1478 struct kvm_device_attr attr = {
1479 .group = KVM_DEV_VFIO_GROUP,
1480 .attr = KVM_DEV_VFIO_GROUP_DEL,
1481 .addr = (uint64_t)(unsigned long)&group->fd,
1482 };
1483
1484 if (vfio_kvm_device_fd < 0) {
1485 return;
1486 }
1487
1488 if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) {
1489 error_report("Failed to remove group %d from KVM VFIO device: %m",
1490 group->groupid);
1491 }
1492 #endif
1493 }
1494
1495 static VFIOAddressSpace *vfio_get_address_space(AddressSpace *as)
1496 {
1497 VFIOAddressSpace *space;
1498
1499 QLIST_FOREACH(space, &vfio_address_spaces, list) {
1500 if (space->as == as) {
1501 return space;
1502 }
1503 }
1504
1505 /* No suitable VFIOAddressSpace, create a new one */
1506 space = g_malloc0(sizeof(*space));
1507 space->as = as;
1508 QLIST_INIT(&space->containers);
1509
1510 QLIST_INSERT_HEAD(&vfio_address_spaces, space, list);
1511
1512 return space;
1513 }
1514
1515 static void vfio_put_address_space(VFIOAddressSpace *space)
1516 {
1517 if (QLIST_EMPTY(&space->containers)) {
1518 QLIST_REMOVE(space, list);
1519 g_free(space);
1520 }
1521 }
1522
1523 /*
1524 * vfio_get_iommu_type - selects the richest iommu_type (v2 first)
1525 */
1526 static int vfio_get_iommu_type(VFIOContainer *container,
1527 Error **errp)
1528 {
1529 int iommu_types[] = { VFIO_TYPE1v2_IOMMU, VFIO_TYPE1_IOMMU,
1530 VFIO_SPAPR_TCE_v2_IOMMU, VFIO_SPAPR_TCE_IOMMU };
1531 int i;
1532
1533 for (i = 0; i < ARRAY_SIZE(iommu_types); i++) {
1534 if (ioctl(container->fd, VFIO_CHECK_EXTENSION, iommu_types[i])) {
1535 return iommu_types[i];
1536 }
1537 }
1538 error_setg(errp, "No available IOMMU models");
1539 return -EINVAL;
1540 }
1541
1542 static int vfio_init_container(VFIOContainer *container, int group_fd,
1543 Error **errp)
1544 {
1545 int iommu_type, ret;
1546
1547 iommu_type = vfio_get_iommu_type(container, errp);
1548 if (iommu_type < 0) {
1549 return iommu_type;
1550 }
1551
1552 ret = ioctl(group_fd, VFIO_GROUP_SET_CONTAINER, &container->fd);
1553 if (ret) {
1554 error_setg_errno(errp, errno, "Failed to set group container");
1555 return -errno;
1556 }
1557
1558 while (ioctl(container->fd, VFIO_SET_IOMMU, iommu_type)) {
1559 if (iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) {
1560 /*
1561 * On sPAPR, despite the IOMMU subdriver always advertises v1 and
1562 * v2, the running platform may not support v2 and there is no
1563 * way to guess it until an IOMMU group gets added to the container.
1564 * So in case it fails with v2, try v1 as a fallback.
1565 */
1566 iommu_type = VFIO_SPAPR_TCE_IOMMU;
1567 continue;
1568 }
1569 error_setg_errno(errp, errno, "Failed to set iommu for container");
1570 return -errno;
1571 }
1572
1573 container->iommu_type = iommu_type;
1574 return 0;
1575 }
1576
1577 static int vfio_get_iommu_info(VFIOContainer *container,
1578 struct vfio_iommu_type1_info **info)
1579 {
1580
1581 size_t argsz = sizeof(struct vfio_iommu_type1_info);
1582
1583 *info = g_new0(struct vfio_iommu_type1_info, 1);
1584 again:
1585 (*info)->argsz = argsz;
1586
1587 if (ioctl(container->fd, VFIO_IOMMU_GET_INFO, *info)) {
1588 g_free(*info);
1589 *info = NULL;
1590 return -errno;
1591 }
1592
1593 if (((*info)->argsz > argsz)) {
1594 argsz = (*info)->argsz;
1595 *info = g_realloc(*info, argsz);
1596 goto again;
1597 }
1598
1599 return 0;
1600 }
1601
1602 static struct vfio_info_cap_header *
1603 vfio_get_iommu_info_cap(struct vfio_iommu_type1_info *info, uint16_t id)
1604 {
1605 struct vfio_info_cap_header *hdr;
1606 void *ptr = info;
1607
1608 if (!(info->flags & VFIO_IOMMU_INFO_CAPS)) {
1609 return NULL;
1610 }
1611
1612 for (hdr = ptr + info->cap_offset; hdr != ptr; hdr = ptr + hdr->next) {
1613 if (hdr->id == id) {
1614 return hdr;
1615 }
1616 }
1617
1618 return NULL;
1619 }
1620
1621 static void vfio_get_iommu_info_migration(VFIOContainer *container,
1622 struct vfio_iommu_type1_info *info)
1623 {
1624 struct vfio_info_cap_header *hdr;
1625 struct vfio_iommu_type1_info_cap_migration *cap_mig;
1626
1627 hdr = vfio_get_iommu_info_cap(info, VFIO_IOMMU_TYPE1_INFO_CAP_MIGRATION);
1628 if (!hdr) {
1629 return;
1630 }
1631
1632 cap_mig = container_of(hdr, struct vfio_iommu_type1_info_cap_migration,
1633 header);
1634
1635 /*
1636 * cpu_physical_memory_set_dirty_lebitmap() expects pages in bitmap of
1637 * TARGET_PAGE_SIZE to mark those dirty.
1638 */
1639 if (cap_mig->pgsize_bitmap & TARGET_PAGE_SIZE) {
1640 container->dirty_pages_supported = true;
1641 container->max_dirty_bitmap_size = cap_mig->max_dirty_bitmap_size;
1642 container->dirty_pgsizes = cap_mig->pgsize_bitmap;
1643 }
1644 }
1645
1646 static int vfio_connect_container(VFIOGroup *group, AddressSpace *as,
1647 Error **errp)
1648 {
1649 VFIOContainer *container;
1650 int ret, fd;
1651 VFIOAddressSpace *space;
1652
1653 space = vfio_get_address_space(as);
1654
1655 /*
1656 * VFIO is currently incompatible with discarding of RAM insofar as the
1657 * madvise to purge (zap) the page from QEMU's address space does not
1658 * interact with the memory API and therefore leaves stale virtual to
1659 * physical mappings in the IOMMU if the page was previously pinned. We
1660 * therefore set discarding broken for each group added to a container,
1661 * whether the container is used individually or shared. This provides
1662 * us with options to allow devices within a group to opt-in and allow
1663 * discarding, so long as it is done consistently for a group (for instance
1664 * if the device is an mdev device where it is known that the host vendor
1665 * driver will never pin pages outside of the working set of the guest
1666 * driver, which would thus not be discarding candidates).
1667 *
1668 * The first opportunity to induce pinning occurs here where we attempt to
1669 * attach the group to existing containers within the AddressSpace. If any
1670 * pages are already zapped from the virtual address space, such as from
1671 * previous discards, new pinning will cause valid mappings to be
1672 * re-established. Likewise, when the overall MemoryListener for a new
1673 * container is registered, a replay of mappings within the AddressSpace
1674 * will occur, re-establishing any previously zapped pages as well.
1675 *
1676 * Especially virtio-balloon is currently only prevented from discarding
1677 * new memory, it will not yet set ram_block_discard_set_required() and
1678 * therefore, neither stops us here or deals with the sudden memory
1679 * consumption of inflated memory.
1680 */
1681 ret = ram_block_discard_disable(true);
1682 if (ret) {
1683 error_setg_errno(errp, -ret, "Cannot set discarding of RAM broken");
1684 return ret;
1685 }
1686
1687 QLIST_FOREACH(container, &space->containers, next) {
1688 if (!ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &container->fd)) {
1689 group->container = container;
1690 QLIST_INSERT_HEAD(&container->group_list, group, container_next);
1691 vfio_kvm_device_add_group(group);
1692 return 0;
1693 }
1694 }
1695
1696 fd = qemu_open_old("/dev/vfio/vfio", O_RDWR);
1697 if (fd < 0) {
1698 error_setg_errno(errp, errno, "failed to open /dev/vfio/vfio");
1699 ret = -errno;
1700 goto put_space_exit;
1701 }
1702
1703 ret = ioctl(fd, VFIO_GET_API_VERSION);
1704 if (ret != VFIO_API_VERSION) {
1705 error_setg(errp, "supported vfio version: %d, "
1706 "reported version: %d", VFIO_API_VERSION, ret);
1707 ret = -EINVAL;
1708 goto close_fd_exit;
1709 }
1710
1711 container = g_malloc0(sizeof(*container));
1712 container->space = space;
1713 container->fd = fd;
1714 container->error = NULL;
1715 container->dirty_pages_supported = false;
1716 QLIST_INIT(&container->giommu_list);
1717 QLIST_INIT(&container->hostwin_list);
1718
1719 ret = vfio_init_container(container, group->fd, errp);
1720 if (ret) {
1721 goto free_container_exit;
1722 }
1723
1724 switch (container->iommu_type) {
1725 case VFIO_TYPE1v2_IOMMU:
1726 case VFIO_TYPE1_IOMMU:
1727 {
1728 struct vfio_iommu_type1_info *info;
1729
1730 /*
1731 * FIXME: This assumes that a Type1 IOMMU can map any 64-bit
1732 * IOVA whatsoever. That's not actually true, but the current
1733 * kernel interface doesn't tell us what it can map, and the
1734 * existing Type1 IOMMUs generally support any IOVA we're
1735 * going to actually try in practice.
1736 */
1737 ret = vfio_get_iommu_info(container, &info);
1738
1739 if (ret || !(info->flags & VFIO_IOMMU_INFO_PGSIZES)) {
1740 /* Assume 4k IOVA page size */
1741 info->iova_pgsizes = 4096;
1742 }
1743 vfio_host_win_add(container, 0, (hwaddr)-1, info->iova_pgsizes);
1744 container->pgsizes = info->iova_pgsizes;
1745
1746 if (!ret) {
1747 vfio_get_iommu_info_migration(container, info);
1748 }
1749 g_free(info);
1750 break;
1751 }
1752 case VFIO_SPAPR_TCE_v2_IOMMU:
1753 case VFIO_SPAPR_TCE_IOMMU:
1754 {
1755 struct vfio_iommu_spapr_tce_info info;
1756 bool v2 = container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU;
1757
1758 /*
1759 * The host kernel code implementing VFIO_IOMMU_DISABLE is called
1760 * when container fd is closed so we do not call it explicitly
1761 * in this file.
1762 */
1763 if (!v2) {
1764 ret = ioctl(fd, VFIO_IOMMU_ENABLE);
1765 if (ret) {
1766 error_setg_errno(errp, errno, "failed to enable container");
1767 ret = -errno;
1768 goto free_container_exit;
1769 }
1770 } else {
1771 container->prereg_listener = vfio_prereg_listener;
1772
1773 memory_listener_register(&container->prereg_listener,
1774 &address_space_memory);
1775 if (container->error) {
1776 memory_listener_unregister(&container->prereg_listener);
1777 ret = -1;
1778 error_propagate_prepend(errp, container->error,
1779 "RAM memory listener initialization failed: ");
1780 goto free_container_exit;
1781 }
1782 }
1783
1784 info.argsz = sizeof(info);
1785 ret = ioctl(fd, VFIO_IOMMU_SPAPR_TCE_GET_INFO, &info);
1786 if (ret) {
1787 error_setg_errno(errp, errno,
1788 "VFIO_IOMMU_SPAPR_TCE_GET_INFO failed");
1789 ret = -errno;
1790 if (v2) {
1791 memory_listener_unregister(&container->prereg_listener);
1792 }
1793 goto free_container_exit;
1794 }
1795
1796 if (v2) {
1797 container->pgsizes = info.ddw.pgsizes;
1798 /*
1799 * There is a default window in just created container.
1800 * To make region_add/del simpler, we better remove this
1801 * window now and let those iommu_listener callbacks
1802 * create/remove them when needed.
1803 */
1804 ret = vfio_spapr_remove_window(container, info.dma32_window_start);
1805 if (ret) {
1806 error_setg_errno(errp, -ret,
1807 "failed to remove existing window");
1808 goto free_container_exit;
1809 }
1810 } else {
1811 /* The default table uses 4K pages */
1812 container->pgsizes = 0x1000;
1813 vfio_host_win_add(container, info.dma32_window_start,
1814 info.dma32_window_start +
1815 info.dma32_window_size - 1,
1816 0x1000);
1817 }
1818 }
1819 }
1820
1821 vfio_kvm_device_add_group(group);
1822
1823 QLIST_INIT(&container->group_list);
1824 QLIST_INSERT_HEAD(&space->containers, container, next);
1825
1826 group->container = container;
1827 QLIST_INSERT_HEAD(&container->group_list, group, container_next);
1828
1829 container->listener = vfio_memory_listener;
1830
1831 memory_listener_register(&container->listener, container->space->as);
1832
1833 if (container->error) {
1834 ret = -1;
1835 error_propagate_prepend(errp, container->error,
1836 "memory listener initialization failed: ");
1837 goto listener_release_exit;
1838 }
1839
1840 container->initialized = true;
1841
1842 return 0;
1843 listener_release_exit:
1844 QLIST_REMOVE(group, container_next);
1845 QLIST_REMOVE(container, next);
1846 vfio_kvm_device_del_group(group);
1847 vfio_listener_release(container);
1848
1849 free_container_exit:
1850 g_free(container);
1851
1852 close_fd_exit:
1853 close(fd);
1854
1855 put_space_exit:
1856 ram_block_discard_disable(false);
1857 vfio_put_address_space(space);
1858
1859 return ret;
1860 }
1861
1862 static void vfio_disconnect_container(VFIOGroup *group)
1863 {
1864 VFIOContainer *container = group->container;
1865
1866 QLIST_REMOVE(group, container_next);
1867 group->container = NULL;
1868
1869 /*
1870 * Explicitly release the listener first before unset container,
1871 * since unset may destroy the backend container if it's the last
1872 * group.
1873 */
1874 if (QLIST_EMPTY(&container->group_list)) {
1875 vfio_listener_release(container);
1876 }
1877
1878 if (ioctl(group->fd, VFIO_GROUP_UNSET_CONTAINER, &container->fd)) {
1879 error_report("vfio: error disconnecting group %d from container",
1880 group->groupid);
1881 }
1882
1883 if (QLIST_EMPTY(&container->group_list)) {
1884 VFIOAddressSpace *space = container->space;
1885 VFIOGuestIOMMU *giommu, *tmp;
1886
1887 QLIST_REMOVE(container, next);
1888
1889 QLIST_FOREACH_SAFE(giommu, &container->giommu_list, giommu_next, tmp) {
1890 memory_region_unregister_iommu_notifier(
1891 MEMORY_REGION(giommu->iommu), &giommu->n);
1892 QLIST_REMOVE(giommu, giommu_next);
1893 g_free(giommu);
1894 }
1895
1896 trace_vfio_disconnect_container(container->fd);
1897 close(container->fd);
1898 g_free(container);
1899
1900 vfio_put_address_space(space);
1901 }
1902 }
1903
1904 VFIOGroup *vfio_get_group(int groupid, AddressSpace *as, Error **errp)
1905 {
1906 VFIOGroup *group;
1907 char path[32];
1908 struct vfio_group_status status = { .argsz = sizeof(status) };
1909
1910 QLIST_FOREACH(group, &vfio_group_list, next) {
1911 if (group->groupid == groupid) {
1912 /* Found it. Now is it already in the right context? */
1913 if (group->container->space->as == as) {
1914 return group;
1915 } else {
1916 error_setg(errp, "group %d used in multiple address spaces",
1917 group->groupid);
1918 return NULL;
1919 }
1920 }
1921 }
1922
1923 group = g_malloc0(sizeof(*group));
1924
1925 snprintf(path, sizeof(path), "/dev/vfio/%d", groupid);
1926 group->fd = qemu_open_old(path, O_RDWR);
1927 if (group->fd < 0) {
1928 error_setg_errno(errp, errno, "failed to open %s", path);
1929 goto free_group_exit;
1930 }
1931
1932 if (ioctl(group->fd, VFIO_GROUP_GET_STATUS, &status)) {
1933 error_setg_errno(errp, errno, "failed to get group %d status", groupid);
1934 goto close_fd_exit;
1935 }
1936
1937 if (!(status.flags & VFIO_GROUP_FLAGS_VIABLE)) {
1938 error_setg(errp, "group %d is not viable", groupid);
1939 error_append_hint(errp,
1940 "Please ensure all devices within the iommu_group "
1941 "are bound to their vfio bus driver.\n");
1942 goto close_fd_exit;
1943 }
1944
1945 group->groupid = groupid;
1946 QLIST_INIT(&group->device_list);
1947
1948 if (vfio_connect_container(group, as, errp)) {
1949 error_prepend(errp, "failed to setup container for group %d: ",
1950 groupid);
1951 goto close_fd_exit;
1952 }
1953
1954 if (QLIST_EMPTY(&vfio_group_list)) {
1955 qemu_register_reset(vfio_reset_handler, NULL);
1956 }
1957
1958 QLIST_INSERT_HEAD(&vfio_group_list, group, next);
1959
1960 return group;
1961
1962 close_fd_exit:
1963 close(group->fd);
1964
1965 free_group_exit:
1966 g_free(group);
1967
1968 return NULL;
1969 }
1970
1971 void vfio_put_group(VFIOGroup *group)
1972 {
1973 if (!group || !QLIST_EMPTY(&group->device_list)) {
1974 return;
1975 }
1976
1977 if (!group->ram_block_discard_allowed) {
1978 ram_block_discard_disable(false);
1979 }
1980 vfio_kvm_device_del_group(group);
1981 vfio_disconnect_container(group);
1982 QLIST_REMOVE(group, next);
1983 trace_vfio_put_group(group->fd);
1984 close(group->fd);
1985 g_free(group);
1986
1987 if (QLIST_EMPTY(&vfio_group_list)) {
1988 qemu_unregister_reset(vfio_reset_handler, NULL);
1989 }
1990 }
1991
1992 int vfio_get_device(VFIOGroup *group, const char *name,
1993 VFIODevice *vbasedev, Error **errp)
1994 {
1995 struct vfio_device_info dev_info = { .argsz = sizeof(dev_info) };
1996 int ret, fd;
1997
1998 fd = ioctl(group->fd, VFIO_GROUP_GET_DEVICE_FD, name);
1999 if (fd < 0) {
2000 error_setg_errno(errp, errno, "error getting device from group %d",
2001 group->groupid);
2002 error_append_hint(errp,
2003 "Verify all devices in group %d are bound to vfio-<bus> "
2004 "or pci-stub and not already in use\n", group->groupid);
2005 return fd;
2006 }
2007
2008 ret = ioctl(fd, VFIO_DEVICE_GET_INFO, &dev_info);
2009 if (ret) {
2010 error_setg_errno(errp, errno, "error getting device info");
2011 close(fd);
2012 return ret;
2013 }
2014
2015 /*
2016 * Set discarding of RAM as not broken for this group if the driver knows
2017 * the device operates compatibly with discarding. Setting must be
2018 * consistent per group, but since compatibility is really only possible
2019 * with mdev currently, we expect singleton groups.
2020 */
2021 if (vbasedev->ram_block_discard_allowed !=
2022 group->ram_block_discard_allowed) {
2023 if (!QLIST_EMPTY(&group->device_list)) {
2024 error_setg(errp, "Inconsistent setting of support for discarding "
2025 "RAM (e.g., balloon) within group");
2026 close(fd);
2027 return -1;
2028 }
2029
2030 if (!group->ram_block_discard_allowed) {
2031 group->ram_block_discard_allowed = true;
2032 ram_block_discard_disable(false);
2033 }
2034 }
2035
2036 vbasedev->fd = fd;
2037 vbasedev->group = group;
2038 QLIST_INSERT_HEAD(&group->device_list, vbasedev, next);
2039
2040 vbasedev->num_irqs = dev_info.num_irqs;
2041 vbasedev->num_regions = dev_info.num_regions;
2042 vbasedev->flags = dev_info.flags;
2043
2044 trace_vfio_get_device(name, dev_info.flags, dev_info.num_regions,
2045 dev_info.num_irqs);
2046
2047 vbasedev->reset_works = !!(dev_info.flags & VFIO_DEVICE_FLAGS_RESET);
2048 return 0;
2049 }
2050
2051 void vfio_put_base_device(VFIODevice *vbasedev)
2052 {
2053 if (!vbasedev->group) {
2054 return;
2055 }
2056 QLIST_REMOVE(vbasedev, next);
2057 vbasedev->group = NULL;
2058 trace_vfio_put_base_device(vbasedev->fd);
2059 close(vbasedev->fd);
2060 }
2061
2062 int vfio_get_region_info(VFIODevice *vbasedev, int index,
2063 struct vfio_region_info **info)
2064 {
2065 size_t argsz = sizeof(struct vfio_region_info);
2066
2067 *info = g_malloc0(argsz);
2068
2069 (*info)->index = index;
2070 retry:
2071 (*info)->argsz = argsz;
2072
2073 if (ioctl(vbasedev->fd, VFIO_DEVICE_GET_REGION_INFO, *info)) {
2074 g_free(*info);
2075 *info = NULL;
2076 return -errno;
2077 }
2078
2079 if ((*info)->argsz > argsz) {
2080 argsz = (*info)->argsz;
2081 *info = g_realloc(*info, argsz);
2082
2083 goto retry;
2084 }
2085
2086 return 0;
2087 }
2088
2089 int vfio_get_dev_region_info(VFIODevice *vbasedev, uint32_t type,
2090 uint32_t subtype, struct vfio_region_info **info)
2091 {
2092 int i;
2093
2094 for (i = 0; i < vbasedev->num_regions; i++) {
2095 struct vfio_info_cap_header *hdr;
2096 struct vfio_region_info_cap_type *cap_type;
2097
2098 if (vfio_get_region_info(vbasedev, i, info)) {
2099 continue;
2100 }
2101
2102 hdr = vfio_get_region_info_cap(*info, VFIO_REGION_INFO_CAP_TYPE);
2103 if (!hdr) {
2104 g_free(*info);
2105 continue;
2106 }
2107
2108 cap_type = container_of(hdr, struct vfio_region_info_cap_type, header);
2109
2110 trace_vfio_get_dev_region(vbasedev->name, i,
2111 cap_type->type, cap_type->subtype);
2112
2113 if (cap_type->type == type && cap_type->subtype == subtype) {
2114 return 0;
2115 }
2116
2117 g_free(*info);
2118 }
2119
2120 *info = NULL;
2121 return -ENODEV;
2122 }
2123
2124 bool vfio_has_region_cap(VFIODevice *vbasedev, int region, uint16_t cap_type)
2125 {
2126 struct vfio_region_info *info = NULL;
2127 bool ret = false;
2128
2129 if (!vfio_get_region_info(vbasedev, region, &info)) {
2130 if (vfio_get_region_info_cap(info, cap_type)) {
2131 ret = true;
2132 }
2133 g_free(info);
2134 }
2135
2136 return ret;
2137 }
2138
2139 /*
2140 * Interfaces for IBM EEH (Enhanced Error Handling)
2141 */
2142 static bool vfio_eeh_container_ok(VFIOContainer *container)
2143 {
2144 /*
2145 * As of 2016-03-04 (linux-4.5) the host kernel EEH/VFIO
2146 * implementation is broken if there are multiple groups in a
2147 * container. The hardware works in units of Partitionable
2148 * Endpoints (== IOMMU groups) and the EEH operations naively
2149 * iterate across all groups in the container, without any logic
2150 * to make sure the groups have their state synchronized. For
2151 * certain operations (ENABLE) that might be ok, until an error
2152 * occurs, but for others (GET_STATE) it's clearly broken.
2153 */
2154
2155 /*
2156 * XXX Once fixed kernels exist, test for them here
2157 */
2158
2159 if (QLIST_EMPTY(&container->group_list)) {
2160 return false;
2161 }
2162
2163 if (QLIST_NEXT(QLIST_FIRST(&container->group_list), container_next)) {
2164 return false;
2165 }
2166
2167 return true;
2168 }
2169
2170 static int vfio_eeh_container_op(VFIOContainer *container, uint32_t op)
2171 {
2172 struct vfio_eeh_pe_op pe_op = {
2173 .argsz = sizeof(pe_op),
2174 .op = op,
2175 };
2176 int ret;
2177
2178 if (!vfio_eeh_container_ok(container)) {
2179 error_report("vfio/eeh: EEH_PE_OP 0x%x: "
2180 "kernel requires a container with exactly one group", op);
2181 return -EPERM;
2182 }
2183
2184 ret = ioctl(container->fd, VFIO_EEH_PE_OP, &pe_op);
2185 if (ret < 0) {
2186 error_report("vfio/eeh: EEH_PE_OP 0x%x failed: %m", op);
2187 return -errno;
2188 }
2189
2190 return ret;
2191 }
2192
2193 static VFIOContainer *vfio_eeh_as_container(AddressSpace *as)
2194 {
2195 VFIOAddressSpace *space = vfio_get_address_space(as);
2196 VFIOContainer *container = NULL;
2197
2198 if (QLIST_EMPTY(&space->containers)) {
2199 /* No containers to act on */
2200 goto out;
2201 }
2202
2203 container = QLIST_FIRST(&space->containers);
2204
2205 if (QLIST_NEXT(container, next)) {
2206 /* We don't yet have logic to synchronize EEH state across
2207 * multiple containers */
2208 container = NULL;
2209 goto out;
2210 }
2211
2212 out:
2213 vfio_put_address_space(space);
2214 return container;
2215 }
2216
2217 bool vfio_eeh_as_ok(AddressSpace *as)
2218 {
2219 VFIOContainer *container = vfio_eeh_as_container(as);
2220
2221 return (container != NULL) && vfio_eeh_container_ok(container);
2222 }
2223
2224 int vfio_eeh_as_op(AddressSpace *as, uint32_t op)
2225 {
2226 VFIOContainer *container = vfio_eeh_as_container(as);
2227
2228 if (!container) {
2229 return -ENODEV;
2230 }
2231 return vfio_eeh_container_op(container, op);
2232 }
QEmu