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 "hw/hw.h"
33#include "qemu/error-report.h"
34#include "qemu/main-loop.h"
35#include "qemu/range.h"
36#include "sysemu/balloon.h"
37#include "sysemu/kvm.h"
38#include "sysemu/reset.h"
39#include "trace.h"
40#include "qapi/error.h"
41
42VFIOGroupList vfio_group_list =
43 QLIST_HEAD_INITIALIZER(vfio_group_list);
44static QLIST_HEAD(, VFIOAddressSpace) vfio_address_spaces =
45 QLIST_HEAD_INITIALIZER(vfio_address_spaces);
46
47#ifdef CONFIG_KVM
48/*
49 * We have a single VFIO pseudo device per KVM VM. Once created it lives
50 * for the life of the VM. Closing the file descriptor only drops our
51 * reference to it and the device's reference to kvm. Therefore once
52 * initialized, this file descriptor is only released on QEMU exit and
53 * we'll re-use it should another vfio device be attached before then.
54 */
55static int vfio_kvm_device_fd = -1;
56#endif
57
58/*
59 * Common VFIO interrupt disable
60 */
61void vfio_disable_irqindex(VFIODevice *vbasedev, int index)
62{
63 struct vfio_irq_set irq_set = {
64 .argsz = sizeof(irq_set),
65 .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER,
66 .index = index,
67 .start = 0,
68 .count = 0,
69 };
70
71 ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set);
72}
73
74void vfio_unmask_single_irqindex(VFIODevice *vbasedev, int index)
75{
76 struct vfio_irq_set irq_set = {
77 .argsz = sizeof(irq_set),
78 .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_UNMASK,
79 .index = index,
80 .start = 0,
81 .count = 1,
82 };
83
84 ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set);
85}
86
87void vfio_mask_single_irqindex(VFIODevice *vbasedev, int index)
88{
89 struct vfio_irq_set irq_set = {
90 .argsz = sizeof(irq_set),
91 .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_MASK,
92 .index = index,
93 .start = 0,
94 .count = 1,
95 };
96
97 ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set);
98}
99
100static inline const char *action_to_str(int action)
101{
102 switch (action) {
103 case VFIO_IRQ_SET_ACTION_MASK:
104 return "MASK";
105 case VFIO_IRQ_SET_ACTION_UNMASK:
106 return "UNMASK";
107 case VFIO_IRQ_SET_ACTION_TRIGGER:
108 return "TRIGGER";
109 default:
110 return "UNKNOWN ACTION";
111 }
112}
113
114static const char *index_to_str(VFIODevice *vbasedev, int index)
115{
116 if (vbasedev->type != VFIO_DEVICE_TYPE_PCI) {
117 return NULL;
118 }
119
120 switch (index) {
121 case VFIO_PCI_INTX_IRQ_INDEX:
122 return "INTX";
123 case VFIO_PCI_MSI_IRQ_INDEX:
124 return "MSI";
125 case VFIO_PCI_MSIX_IRQ_INDEX:
126 return "MSIX";
127 case VFIO_PCI_ERR_IRQ_INDEX:
128 return "ERR";
129 case VFIO_PCI_REQ_IRQ_INDEX:
130 return "REQ";
131 default:
132 return NULL;
133 }
134}
135
136int vfio_set_irq_signaling(VFIODevice *vbasedev, int index, int subindex,
137 int action, int fd, Error **errp)
138{
139 struct vfio_irq_set *irq_set;
140 int argsz, ret = 0;
141 const char *name;
142 int32_t *pfd;
143
144 argsz = sizeof(*irq_set) + sizeof(*pfd);
145
146 irq_set = g_malloc0(argsz);
147 irq_set->argsz = argsz;
148 irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | action;
149 irq_set->index = index;
150 irq_set->start = subindex;
151 irq_set->count = 1;
152 pfd = (int32_t *)&irq_set->data;
153 *pfd = fd;
154
155 if (ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, irq_set)) {
156 ret = -errno;
157 }
158 g_free(irq_set);
159
160 if (!ret) {
161 return 0;
162 }
163
164 error_setg_errno(errp, -ret, "VFIO_DEVICE_SET_IRQS failure");
165
166 name = index_to_str(vbasedev, index);
167 if (name) {
168 error_prepend(errp, "%s-%d: ", name, subindex);
169 } else {
170 error_prepend(errp, "index %d-%d: ", index, subindex);
171 }
172 error_prepend(errp,
173 "Failed to %s %s eventfd signaling for interrupt ",
174 fd < 0 ? "tear down" : "set up", action_to_str(action));
175 return ret;
176}
177
178/*
179 * IO Port/MMIO - Beware of the endians, VFIO is always little endian
180 */
181void vfio_region_write(void *opaque, hwaddr addr,
182 uint64_t data, unsigned size)
183{
184 VFIORegion *region = opaque;
185 VFIODevice *vbasedev = region->vbasedev;
186 union {
187 uint8_t byte;
188 uint16_t word;
189 uint32_t dword;
190 uint64_t qword;
191 } buf;
192
193 switch (size) {
194 case 1:
195 buf.byte = data;
196 break;
197 case 2:
198 buf.word = cpu_to_le16(data);
199 break;
200 case 4:
201 buf.dword = cpu_to_le32(data);
202 break;
203 case 8:
204 buf.qword = cpu_to_le64(data);
205 break;
206 default:
207 hw_error("vfio: unsupported write size, %d bytes", size);
208 break;
209 }
210
211 if (pwrite(vbasedev->fd, &buf, size, region->fd_offset + addr) != size) {
212 error_report("%s(%s:region%d+0x%"HWADDR_PRIx", 0x%"PRIx64
213 ",%d) failed: %m",
214 __func__, vbasedev->name, region->nr,
215 addr, data, size);
216 }
217
218 trace_vfio_region_write(vbasedev->name, region->nr, addr, data, size);
219
220 /*
221 * A read or write to a BAR always signals an INTx EOI. This will
222 * do nothing if not pending (including not in INTx mode). We assume
223 * that a BAR access is in response to an interrupt and that BAR
224 * accesses will service the interrupt. Unfortunately, we don't know
225 * which access will service the interrupt, so we're potentially
226 * getting quite a few host interrupts per guest interrupt.
227 */
228 vbasedev->ops->vfio_eoi(vbasedev);
229}
230
231uint64_t vfio_region_read(void *opaque,
232 hwaddr addr, unsigned size)
233{
234 VFIORegion *region = opaque;
235 VFIODevice *vbasedev = region->vbasedev;
236 union {
237 uint8_t byte;
238 uint16_t word;
239 uint32_t dword;
240 uint64_t qword;
241 } buf;
242 uint64_t data = 0;
243
244 if (pread(vbasedev->fd, &buf, size, region->fd_offset + addr) != size) {
245 error_report("%s(%s:region%d+0x%"HWADDR_PRIx", %d) failed: %m",
246 __func__, vbasedev->name, region->nr,
247 addr, size);
248 return (uint64_t)-1;
249 }
250 switch (size) {
251 case 1:
252 data = buf.byte;
253 break;
254 case 2:
255 data = le16_to_cpu(buf.word);
256 break;
257 case 4:
258 data = le32_to_cpu(buf.dword);
259 break;
260 case 8:
261 data = le64_to_cpu(buf.qword);
262 break;
263 default:
264 hw_error("vfio: unsupported read size, %d bytes", size);
265 break;
266 }
267
268 trace_vfio_region_read(vbasedev->name, region->nr, addr, size, data);
269
270 /* Same as write above */
271 vbasedev->ops->vfio_eoi(vbasedev);
272
273 return data;
274}
275
276const MemoryRegionOps vfio_region_ops = {
277 .read = vfio_region_read,
278 .write = vfio_region_write,
279 .endianness = DEVICE_LITTLE_ENDIAN,
280 .valid = {
281 .min_access_size = 1,
282 .max_access_size = 8,
283 },
284 .impl = {
285 .min_access_size = 1,
286 .max_access_size = 8,
287 },
288};
289
290/*
291 * DMA - Mapping and unmapping for the "type1" IOMMU interface used on x86
292 */
293static int vfio_dma_unmap(VFIOContainer *container,
294 hwaddr iova, ram_addr_t size)
295{
296 struct vfio_iommu_type1_dma_unmap unmap = {
297 .argsz = sizeof(unmap),
298 .flags = 0,
299 .iova = iova,
300 .size = size,
301 };
302
303 while (ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, &unmap)) {
304 /*
305 * The type1 backend has an off-by-one bug in the kernel (71a7d3d78e3c
306 * v4.15) where an overflow in its wrap-around check prevents us from
307 * unmapping the last page of the address space. Test for the error
308 * condition and re-try the unmap excluding the last page. The
309 * expectation is that we've never mapped the last page anyway and this
310 * unmap request comes via vIOMMU support which also makes it unlikely
311 * that this page is used. This bug was introduced well after type1 v2
312 * support was introduced, so we shouldn't need to test for v1. A fix
313 * is queued for kernel v5.0 so this workaround can be removed once
314 * affected kernels are sufficiently deprecated.
315 */
316 if (errno == EINVAL && unmap.size && !(unmap.iova + unmap.size) &&
317 container->iommu_type == VFIO_TYPE1v2_IOMMU) {
318 trace_vfio_dma_unmap_overflow_workaround();
319 unmap.size -= 1ULL << ctz64(container->pgsizes);
320 continue;
321 }
322 error_report("VFIO_UNMAP_DMA: %d", -errno);
323 return -errno;
324 }
325
326 return 0;
327}
328
329static int vfio_dma_map(VFIOContainer *container, hwaddr iova,
330 ram_addr_t size, void *vaddr, bool readonly)
331{
332 struct vfio_iommu_type1_dma_map map = {
333 .argsz = sizeof(map),
334 .flags = VFIO_DMA_MAP_FLAG_READ,
335 .vaddr = (__u64)(uintptr_t)vaddr,
336 .iova = iova,
337 .size = size,
338 };
339
340 if (!readonly) {
341 map.flags |= VFIO_DMA_MAP_FLAG_WRITE;
342 }
343
344 /*
345 * Try the mapping, if it fails with EBUSY, unmap the region and try
346 * again. This shouldn't be necessary, but we sometimes see it in
347 * the VGA ROM space.
348 */
349 if (ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0 ||
350 (errno == EBUSY && vfio_dma_unmap(container, iova, size) == 0 &&
351 ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0)) {
352 return 0;
353 }
354
355 error_report("VFIO_MAP_DMA: %d", -errno);
356 return -errno;
357}
358
359static void vfio_host_win_add(VFIOContainer *container,
360 hwaddr min_iova, hwaddr max_iova,
361 uint64_t iova_pgsizes)
362{
363 VFIOHostDMAWindow *hostwin;
364
365 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) {
366 if (ranges_overlap(hostwin->min_iova,
367 hostwin->max_iova - hostwin->min_iova + 1,
368 min_iova,
369 max_iova - min_iova + 1)) {
370 hw_error("%s: Overlapped IOMMU are not enabled", __func__);
371 }
372 }
373
374 hostwin = g_malloc0(sizeof(*hostwin));
375
376 hostwin->min_iova = min_iova;
377 hostwin->max_iova = max_iova;
378 hostwin->iova_pgsizes = iova_pgsizes;
379 QLIST_INSERT_HEAD(&container->hostwin_list, hostwin, hostwin_next);
380}
381
382static int vfio_host_win_del(VFIOContainer *container, hwaddr min_iova,
383 hwaddr max_iova)
384{
385 VFIOHostDMAWindow *hostwin;
386
387 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) {
388 if (hostwin->min_iova == min_iova && hostwin->max_iova == max_iova) {
389 QLIST_REMOVE(hostwin, hostwin_next);
390 return 0;
391 }
392 }
393
394 return -1;
395}
396
397static bool vfio_listener_skipped_section(MemoryRegionSection *section)
398{
399 return (!memory_region_is_ram(section->mr) &&
400 !memory_region_is_iommu(section->mr)) ||
401 /*
402 * Sizing an enabled 64-bit BAR can cause spurious mappings to
403 * addresses in the upper part of the 64-bit address space. These
404 * are never accessed by the CPU and beyond the address width of
405 * some IOMMU hardware. TODO: VFIO should tell us the IOMMU width.
406 */
407 section->offset_within_address_space & (1ULL << 63);
408}
409
410/* Called with rcu_read_lock held. */
411static bool vfio_get_vaddr(IOMMUTLBEntry *iotlb, void **vaddr,
412 bool *read_only)
413{
414 MemoryRegion *mr;
415 hwaddr xlat;
416 hwaddr len = iotlb->addr_mask + 1;
417 bool writable = iotlb->perm & IOMMU_WO;
418
419 /*
420 * The IOMMU TLB entry we have just covers translation through
421 * this IOMMU to its immediate target. We need to translate
422 * it the rest of the way through to memory.
423 */
424 mr = address_space_translate(&address_space_memory,
425 iotlb->translated_addr,
426 &xlat, &len, writable,
427 MEMTXATTRS_UNSPECIFIED);
428 if (!memory_region_is_ram(mr)) {
429 error_report("iommu map to non memory area %"HWADDR_PRIx"",
430 xlat);
431 return false;
432 }
433
434 /*
435 * Translation truncates length to the IOMMU page size,
436 * check that it did not truncate too much.
437 */
438 if (len & iotlb->addr_mask) {
439 error_report("iommu has granularity incompatible with target AS");
440 return false;
441 }
442
443 *vaddr = memory_region_get_ram_ptr(mr) + xlat;
444 *read_only = !writable || mr->readonly;
445
446 return true;
447}
448
449static void vfio_iommu_map_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb)
450{
451 VFIOGuestIOMMU *giommu = container_of(n, VFIOGuestIOMMU, n);
452 VFIOContainer *container = giommu->container;
453 hwaddr iova = iotlb->iova + giommu->iommu_offset;
454 bool read_only;
455 void *vaddr;
456 int ret;
457
458 trace_vfio_iommu_map_notify(iotlb->perm == IOMMU_NONE ? "UNMAP" : "MAP",
459 iova, iova + iotlb->addr_mask);
460
461 if (iotlb->target_as != &address_space_memory) {
462 error_report("Wrong target AS \"%s\", only system memory is allowed",
463 iotlb->target_as->name ? iotlb->target_as->name : "none");
464 return;
465 }
466
467 rcu_read_lock();
468
469 if ((iotlb->perm & IOMMU_RW) != IOMMU_NONE) {
470 if (!vfio_get_vaddr(iotlb, &vaddr, &read_only)) {
471 goto out;
472 }
473 /*
474 * vaddr is only valid until rcu_read_unlock(). But after
475 * vfio_dma_map has set up the mapping the pages will be
476 * pinned by the kernel. This makes sure that the RAM backend
477 * of vaddr will always be there, even if the memory object is
478 * destroyed and its backing memory munmap-ed.
479 */
480 ret = vfio_dma_map(container, iova,
481 iotlb->addr_mask + 1, vaddr,
482 read_only);
483 if (ret) {
484 error_report("vfio_dma_map(%p, 0x%"HWADDR_PRIx", "
485 "0x%"HWADDR_PRIx", %p) = %d (%m)",
486 container, iova,
487 iotlb->addr_mask + 1, vaddr, ret);
488 }
489 } else {
490 ret = vfio_dma_unmap(container, iova, iotlb->addr_mask + 1);
491 if (ret) {
492 error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", "
493 "0x%"HWADDR_PRIx") = %d (%m)",
494 container, iova,
495 iotlb->addr_mask + 1, ret);
496 }
497 }
498out:
499 rcu_read_unlock();
500}
501
502static void vfio_listener_region_add(MemoryListener *listener,
503 MemoryRegionSection *section)
504{
505 VFIOContainer *container = container_of(listener, VFIOContainer, listener);
506 hwaddr iova, end;
507 Int128 llend, llsize;
508 void *vaddr;
509 int ret;
510 VFIOHostDMAWindow *hostwin;
511 bool hostwin_found;
512
513 if (vfio_listener_skipped_section(section)) {
514 trace_vfio_listener_region_add_skip(
515 section->offset_within_address_space,
516 section->offset_within_address_space +
517 int128_get64(int128_sub(section->size, int128_one())));
518 return;
519 }
520
521 if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) !=
522 (section->offset_within_region & ~TARGET_PAGE_MASK))) {
523 error_report("%s received unaligned region", __func__);
524 return;
525 }
526
527 iova = TARGET_PAGE_ALIGN(section->offset_within_address_space);
528 llend = int128_make64(section->offset_within_address_space);
529 llend = int128_add(llend, section->size);
530 llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK));
531
532 if (int128_ge(int128_make64(iova), llend)) {
533 return;
534 }
535 end = int128_get64(int128_sub(llend, int128_one()));
536
537 if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) {
538 hwaddr pgsize = 0;
539
540 /* For now intersections are not allowed, we may relax this later */
541 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) {
542 if (ranges_overlap(hostwin->min_iova,
543 hostwin->max_iova - hostwin->min_iova + 1,
544 section->offset_within_address_space,
545 int128_get64(section->size))) {
546 ret = -1;
547 goto fail;
548 }
549 }
550
551 ret = vfio_spapr_create_window(container, section, &pgsize);
552 if (ret) {
553 goto fail;
554 }
555
556 vfio_host_win_add(container, section->offset_within_address_space,
557 section->offset_within_address_space +
558 int128_get64(section->size) - 1, pgsize);
559#ifdef CONFIG_KVM
560 if (kvm_enabled()) {
561 VFIOGroup *group;
562 IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(section->mr);
563 struct kvm_vfio_spapr_tce param;
564 struct kvm_device_attr attr = {
565 .group = KVM_DEV_VFIO_GROUP,
566 .attr = KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE,
567 .addr = (uint64_t)(unsigned long)&param,
568 };
569
570 if (!memory_region_iommu_get_attr(iommu_mr, IOMMU_ATTR_SPAPR_TCE_FD,
571 &param.tablefd)) {
572 QLIST_FOREACH(group, &container->group_list, container_next) {
573 param.groupfd = group->fd;
574 if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) {
575 error_report("vfio: failed to setup fd %d "
576 "for a group with fd %d: %s",
577 param.tablefd, param.groupfd,
578 strerror(errno));
579 return;
580 }
581 trace_vfio_spapr_group_attach(param.groupfd, param.tablefd);
582 }
583 }
584 }
585#endif
586 }
587
588 hostwin_found = false;
589 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) {
590 if (hostwin->min_iova <= iova && end <= hostwin->max_iova) {
591 hostwin_found = true;
592 break;
593 }
594 }
595
596 if (!hostwin_found) {
597 error_report("vfio: IOMMU container %p can't map guest IOVA region"
598 " 0x%"HWADDR_PRIx"..0x%"HWADDR_PRIx,
599 container, iova, end);
600 ret = -EFAULT;
601 goto fail;
602 }
603
604 memory_region_ref(section->mr);
605
606 if (memory_region_is_iommu(section->mr)) {
607 VFIOGuestIOMMU *giommu;
608 IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(section->mr);
609 int iommu_idx;
610
611 trace_vfio_listener_region_add_iommu(iova, end);
612 /*
613 * FIXME: For VFIO iommu types which have KVM acceleration to
614 * avoid bouncing all map/unmaps through qemu this way, this
615 * would be the right place to wire that up (tell the KVM
616 * device emulation the VFIO iommu handles to use).
617 */
618 giommu = g_malloc0(sizeof(*giommu));
619 giommu->iommu = iommu_mr;
620 giommu->iommu_offset = section->offset_within_address_space -
621 section->offset_within_region;
622 giommu->container = container;
623 llend = int128_add(int128_make64(section->offset_within_region),
624 section->size);
625 llend = int128_sub(llend, int128_one());
626 iommu_idx = memory_region_iommu_attrs_to_index(iommu_mr,
627 MEMTXATTRS_UNSPECIFIED);
628 iommu_notifier_init(&giommu->n, vfio_iommu_map_notify,
629 IOMMU_NOTIFIER_ALL,
630 section->offset_within_region,
631 int128_get64(llend),
632 iommu_idx);
633 QLIST_INSERT_HEAD(&container->giommu_list, giommu, giommu_next);
634
635 memory_region_register_iommu_notifier(section->mr, &giommu->n);
636 memory_region_iommu_replay(giommu->iommu, &giommu->n);
637
638 return;
639 }
640
641 /* Here we assume that memory_region_is_ram(section->mr)==true */
642
643 vaddr = memory_region_get_ram_ptr(section->mr) +
644 section->offset_within_region +
645 (iova - section->offset_within_address_space);
646
647 trace_vfio_listener_region_add_ram(iova, end, vaddr);
648
649 llsize = int128_sub(llend, int128_make64(iova));
650
651 if (memory_region_is_ram_device(section->mr)) {
652 hwaddr pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1;
653
654 if ((iova & pgmask) || (int128_get64(llsize) & pgmask)) {
655 trace_vfio_listener_region_add_no_dma_map(
656 memory_region_name(section->mr),
657 section->offset_within_address_space,
658 int128_getlo(section->size),
659 pgmask + 1);
660 return;
661 }
662 }
663
664 ret = vfio_dma_map(container, iova, int128_get64(llsize),
665 vaddr, section->readonly);
666 if (ret) {
667 error_report("vfio_dma_map(%p, 0x%"HWADDR_PRIx", "
668 "0x%"HWADDR_PRIx", %p) = %d (%m)",
669 container, iova, int128_get64(llsize), vaddr, ret);
670 if (memory_region_is_ram_device(section->mr)) {
671 /* Allow unexpected mappings not to be fatal for RAM devices */
672 return;
673 }
674 goto fail;
675 }
676
677 return;
678
679fail:
680 if (memory_region_is_ram_device(section->mr)) {
681 error_report("failed to vfio_dma_map. pci p2p may not work");
682 return;
683 }
684 /*
685 * On the initfn path, store the first error in the container so we
686 * can gracefully fail. Runtime, there's not much we can do other
687 * than throw a hardware error.
688 */
689 if (!container->initialized) {
690 if (!container->error) {
691 container->error = ret;
692 }
693 } else {
694 hw_error("vfio: DMA mapping failed, unable to continue");
695 }
696}
697
698static void vfio_listener_region_del(MemoryListener *listener,
699 MemoryRegionSection *section)
700{
701 VFIOContainer *container = container_of(listener, VFIOContainer, listener);
702 hwaddr iova, end;
703 Int128 llend, llsize;
704 int ret;
705 bool try_unmap = true;
706
707 if (vfio_listener_skipped_section(section)) {
708 trace_vfio_listener_region_del_skip(
709 section->offset_within_address_space,
710 section->offset_within_address_space +
711 int128_get64(int128_sub(section->size, int128_one())));
712 return;
713 }
714
715 if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) !=
716 (section->offset_within_region & ~TARGET_PAGE_MASK))) {
717 error_report("%s received unaligned region", __func__);
718 return;
719 }
720
721 if (memory_region_is_iommu(section->mr)) {
722 VFIOGuestIOMMU *giommu;
723
724 QLIST_FOREACH(giommu, &container->giommu_list, giommu_next) {
725 if (MEMORY_REGION(giommu->iommu) == section->mr &&
726 giommu->n.start == section->offset_within_region) {
727 memory_region_unregister_iommu_notifier(section->mr,
728 &giommu->n);
729 QLIST_REMOVE(giommu, giommu_next);
730 g_free(giommu);
731 break;
732 }
733 }
734
735 /*
736 * FIXME: We assume the one big unmap below is adequate to
737 * remove any individual page mappings in the IOMMU which
738 * might have been copied into VFIO. This works for a page table
739 * based IOMMU where a big unmap flattens a large range of IO-PTEs.
740 * That may not be true for all IOMMU types.
741 */
742 }
743
744 iova = TARGET_PAGE_ALIGN(section->offset_within_address_space);
745 llend = int128_make64(section->offset_within_address_space);
746 llend = int128_add(llend, section->size);
747 llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK));
748
749 if (int128_ge(int128_make64(iova), llend)) {
750 return;
751 }
752 end = int128_get64(int128_sub(llend, int128_one()));
753
754 llsize = int128_sub(llend, int128_make64(iova));
755
756 trace_vfio_listener_region_del(iova, end);
757
758 if (memory_region_is_ram_device(section->mr)) {
759 hwaddr pgmask;
760 VFIOHostDMAWindow *hostwin;
761 bool hostwin_found = false;
762
763 QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) {
764 if (hostwin->min_iova <= iova && end <= hostwin->max_iova) {
765 hostwin_found = true;
766 break;
767 }
768 }
769 assert(hostwin_found); /* or region_add() would have failed */
770
771 pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1;
772 try_unmap = !((iova & pgmask) || (int128_get64(llsize) & pgmask));
773 }
774
775 if (try_unmap) {
776 ret = vfio_dma_unmap(container, iova, int128_get64(llsize));
777 if (ret) {
778 error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", "
779 "0x%"HWADDR_PRIx") = %d (%m)",
780 container, iova, int128_get64(llsize), ret);
781 }
782 }
783
784 memory_region_unref(section->mr);
785
786 if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) {
787 vfio_spapr_remove_window(container,
788 section->offset_within_address_space);
789 if (vfio_host_win_del(container,
790 section->offset_within_address_space,
791 section->offset_within_address_space +
792 int128_get64(section->size) - 1) < 0) {
793 hw_error("%s: Cannot delete missing window at %"HWADDR_PRIx,
794 __func__, section->offset_within_address_space);
795 }
796 }
797}
798
799static const MemoryListener vfio_memory_listener = {
800 .region_add = vfio_listener_region_add,
801 .region_del = vfio_listener_region_del,
802};
803
804static void vfio_listener_release(VFIOContainer *container)
805{
806 memory_listener_unregister(&container->listener);
807 if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) {
808 memory_listener_unregister(&container->prereg_listener);
809 }
810}
811
812struct vfio_info_cap_header *
813vfio_get_region_info_cap(struct vfio_region_info *info, uint16_t id)
814{
815 struct vfio_info_cap_header *hdr;
816 void *ptr = info;
817
818 if (!(info->flags & VFIO_REGION_INFO_FLAG_CAPS)) {
819 return NULL;
820 }
821
822 for (hdr = ptr + info->cap_offset; hdr != ptr; hdr = ptr + hdr->next) {
823 if (hdr->id == id) {
824 return hdr;
825 }
826 }
827
828 return NULL;
829}
830
831static int vfio_setup_region_sparse_mmaps(VFIORegion *region,
832 struct vfio_region_info *info)
833{
834 struct vfio_info_cap_header *hdr;
835 struct vfio_region_info_cap_sparse_mmap *sparse;
836 int i, j;
837
838 hdr = vfio_get_region_info_cap(info, VFIO_REGION_INFO_CAP_SPARSE_MMAP);
839 if (!hdr) {
840 return -ENODEV;
841 }
842
843 sparse = container_of(hdr, struct vfio_region_info_cap_sparse_mmap, header);
844
845 trace_vfio_region_sparse_mmap_header(region->vbasedev->name,
846 region->nr, sparse->nr_areas);
847
848 region->mmaps = g_new0(VFIOMmap, sparse->nr_areas);
849
850 for (i = 0, j = 0; i < sparse->nr_areas; i++) {
851 trace_vfio_region_sparse_mmap_entry(i, sparse->areas[i].offset,
852 sparse->areas[i].offset +
853 sparse->areas[i].size);
854
855 if (sparse->areas[i].size) {
856 region->mmaps[j].offset = sparse->areas[i].offset;
857 region->mmaps[j].size = sparse->areas[i].size;
858 j++;
859 }
860 }
861
862 region->nr_mmaps = j;
863 region->mmaps = g_realloc(region->mmaps, j * sizeof(VFIOMmap));
864
865 return 0;
866}
867
868int vfio_region_setup(Object *obj, VFIODevice *vbasedev, VFIORegion *region,
869 int index, const char *name)
870{
871 struct vfio_region_info *info;
872 int ret;
873
874 ret = vfio_get_region_info(vbasedev, index, &info);
875 if (ret) {
876 return ret;
877 }
878
879 region->vbasedev = vbasedev;
880 region->flags = info->flags;
881 region->size = info->size;
882 region->fd_offset = info->offset;
883 region->nr = index;
884
885 if (region->size) {
886 region->mem = g_new0(MemoryRegion, 1);
887 memory_region_init_io(region->mem, obj, &vfio_region_ops,
888 region, name, region->size);
889
890 if (!vbasedev->no_mmap &&
891 region->flags & VFIO_REGION_INFO_FLAG_MMAP) {
892
893 ret = vfio_setup_region_sparse_mmaps(region, info);
894
895 if (ret) {
896 region->nr_mmaps = 1;
897 region->mmaps = g_new0(VFIOMmap, region->nr_mmaps);
898 region->mmaps[0].offset = 0;
899 region->mmaps[0].size = region->size;
900 }
901 }
902 }
903
904 g_free(info);
905
906 trace_vfio_region_setup(vbasedev->name, index, name,
907 region->flags, region->fd_offset, region->size);
908 return 0;
909}
910
911int vfio_region_mmap(VFIORegion *region)
912{
913 int i, prot = 0;
914 char *name;
915
916 if (!region->mem) {
917 return 0;
918 }
919
920 prot |= region->flags & VFIO_REGION_INFO_FLAG_READ ? PROT_READ : 0;
921 prot |= region->flags & VFIO_REGION_INFO_FLAG_WRITE ? PROT_WRITE : 0;
922
923 for (i = 0; i < region->nr_mmaps; i++) {
924 region->mmaps[i].mmap = mmap(NULL, region->mmaps[i].size, prot,
925 MAP_SHARED, region->vbasedev->fd,
926 region->fd_offset +
927 region->mmaps[i].offset);
928 if (region->mmaps[i].mmap == MAP_FAILED) {
929 int ret = -errno;
930
931 trace_vfio_region_mmap_fault(memory_region_name(region->mem), i,
932 region->fd_offset +
933 region->mmaps[i].offset,
934 region->fd_offset +
935 region->mmaps[i].offset +
936 region->mmaps[i].size - 1, ret);
937
938 region->mmaps[i].mmap = NULL;
939
940 for (i--; i >= 0; i--) {
941 memory_region_del_subregion(region->mem, &region->mmaps[i].mem);
942 munmap(region->mmaps[i].mmap, region->mmaps[i].size);
943 object_unparent(OBJECT(&region->mmaps[i].mem));
944 region->mmaps[i].mmap = NULL;
945 }
946
947 return ret;
948 }
949
950 name = g_strdup_printf("%s mmaps[%d]",
951 memory_region_name(region->mem), i);
952 memory_region_init_ram_device_ptr(&region->mmaps[i].mem,
953 memory_region_owner(region->mem),
954 name, region->mmaps[i].size,
955 region->mmaps[i].mmap);
956 g_free(name);
957 memory_region_add_subregion(region->mem, region->mmaps[i].offset,
958 &region->mmaps[i].mem);
959
960 trace_vfio_region_mmap(memory_region_name(&region->mmaps[i].mem),
961 region->mmaps[i].offset,
962 region->mmaps[i].offset +
963 region->mmaps[i].size - 1);
964 }
965
966 return 0;
967}
968
969void vfio_region_exit(VFIORegion *region)
970{
971 int i;
972
973 if (!region->mem) {
974 return;
975 }
976
977 for (i = 0; i < region->nr_mmaps; i++) {
978 if (region->mmaps[i].mmap) {
979 memory_region_del_subregion(region->mem, &region->mmaps[i].mem);
980 }
981 }
982
983 trace_vfio_region_exit(region->vbasedev->name, region->nr);
984}
985
986void vfio_region_finalize(VFIORegion *region)
987{
988 int i;
989
990 if (!region->mem) {
991 return;
992 }
993
994 for (i = 0; i < region->nr_mmaps; i++) {
995 if (region->mmaps[i].mmap) {
996 munmap(region->mmaps[i].mmap, region->mmaps[i].size);
997 object_unparent(OBJECT(&region->mmaps[i].mem));
998 }
999 }
1000
1001 object_unparent(OBJECT(region->mem));
1002
1003 g_free(region->mem);
1004 g_free(region->mmaps);
1005
1006 trace_vfio_region_finalize(region->vbasedev->name, region->nr);
1007
1008 region->mem = NULL;
1009 region->mmaps = NULL;
1010 region->nr_mmaps = 0;
1011 region->size = 0;
1012 region->flags = 0;
1013 region->nr = 0;
1014}
1015
1016void vfio_region_mmaps_set_enabled(VFIORegion *region, bool enabled)
1017{
1018 int i;
1019
1020 if (!region->mem) {
1021 return;
1022 }
1023
1024 for (i = 0; i < region->nr_mmaps; i++) {
1025 if (region->mmaps[i].mmap) {
1026 memory_region_set_enabled(&region->mmaps[i].mem, enabled);
1027 }
1028 }
1029
1030 trace_vfio_region_mmaps_set_enabled(memory_region_name(region->mem),
1031 enabled);
1032}
1033
1034void vfio_reset_handler(void *opaque)
1035{
1036 VFIOGroup *group;
1037 VFIODevice *vbasedev;
1038
1039 QLIST_FOREACH(group, &vfio_group_list, next) {
1040 QLIST_FOREACH(vbasedev, &group->device_list, next) {
1041 if (vbasedev->dev->realized) {
1042 vbasedev->ops->vfio_compute_needs_reset(vbasedev);
1043 }
1044 }
1045 }
1046
1047 QLIST_FOREACH(group, &vfio_group_list, next) {
1048 QLIST_FOREACH(vbasedev, &group->device_list, next) {
1049 if (vbasedev->dev->realized && vbasedev->needs_reset) {
1050 vbasedev->ops->vfio_hot_reset_multi(vbasedev);
1051 }
1052 }
1053 }
1054}
1055
1056static void vfio_kvm_device_add_group(VFIOGroup *group)
1057{
1058#ifdef CONFIG_KVM
1059 struct kvm_device_attr attr = {
1060 .group = KVM_DEV_VFIO_GROUP,
1061 .attr = KVM_DEV_VFIO_GROUP_ADD,
1062 .addr = (uint64_t)(unsigned long)&group->fd,
1063 };
1064
1065 if (!kvm_enabled()) {
1066 return;
1067 }
1068
1069 if (vfio_kvm_device_fd < 0) {
1070 struct kvm_create_device cd = {
1071 .type = KVM_DEV_TYPE_VFIO,
1072 };
1073
1074 if (kvm_vm_ioctl(kvm_state, KVM_CREATE_DEVICE, &cd)) {
1075 error_report("Failed to create KVM VFIO device: %m");
1076 return;
1077 }
1078
1079 vfio_kvm_device_fd = cd.fd;
1080 }
1081
1082 if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) {
1083 error_report("Failed to add group %d to KVM VFIO device: %m",
1084 group->groupid);
1085 }
1086#endif
1087}
1088
1089static void vfio_kvm_device_del_group(VFIOGroup *group)
1090{
1091#ifdef CONFIG_KVM
1092 struct kvm_device_attr attr = {
1093 .group = KVM_DEV_VFIO_GROUP,
1094 .attr = KVM_DEV_VFIO_GROUP_DEL,
1095 .addr = (uint64_t)(unsigned long)&group->fd,
1096 };
1097
1098 if (vfio_kvm_device_fd < 0) {
1099 return;
1100 }
1101
1102 if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) {
1103 error_report("Failed to remove group %d from KVM VFIO device: %m",
1104 group->groupid);
1105 }
1106#endif
1107}
1108
1109static VFIOAddressSpace *vfio_get_address_space(AddressSpace *as)
1110{
1111 VFIOAddressSpace *space;
1112
1113 QLIST_FOREACH(space, &vfio_address_spaces, list) {
1114 if (space->as == as) {
1115 return space;
1116 }
1117 }
1118
1119 /* No suitable VFIOAddressSpace, create a new one */
1120 space = g_malloc0(sizeof(*space));
1121 space->as = as;
1122 QLIST_INIT(&space->containers);
1123
1124 QLIST_INSERT_HEAD(&vfio_address_spaces, space, list);
1125
1126 return space;
1127}
1128
1129static void vfio_put_address_space(VFIOAddressSpace *space)
1130{
1131 if (QLIST_EMPTY(&space->containers)) {
1132 QLIST_REMOVE(space, list);
1133 g_free(space);
1134 }
1135}
1136
1137/*
1138 * vfio_get_iommu_type - selects the richest iommu_type (v2 first)
1139 */
1140static int vfio_get_iommu_type(VFIOContainer *container,
1141 Error **errp)
1142{
1143 int iommu_types[] = { VFIO_TYPE1v2_IOMMU, VFIO_TYPE1_IOMMU,
1144 VFIO_SPAPR_TCE_v2_IOMMU, VFIO_SPAPR_TCE_IOMMU };
1145 int i;
1146
1147 for (i = 0; i < ARRAY_SIZE(iommu_types); i++) {
1148 if (ioctl(container->fd, VFIO_CHECK_EXTENSION, iommu_types[i])) {
1149 return iommu_types[i];
1150 }
1151 }
1152 error_setg(errp, "No available IOMMU models");
1153 return -EINVAL;
1154}
1155
1156static int vfio_init_container(VFIOContainer *container, int group_fd,
1157 Error **errp)
1158{
1159 int iommu_type, ret;
1160
1161 iommu_type = vfio_get_iommu_type(container, errp);
1162 if (iommu_type < 0) {
1163 return iommu_type;
1164 }
1165
1166 ret = ioctl(group_fd, VFIO_GROUP_SET_CONTAINER, &container->fd);
1167 if (ret) {
1168 error_setg_errno(errp, errno, "Failed to set group container");
1169 return -errno;
1170 }
1171
1172 while (ioctl(container->fd, VFIO_SET_IOMMU, iommu_type)) {
1173 if (iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) {
1174 /*
1175 * On sPAPR, despite the IOMMU subdriver always advertises v1 and
1176 * v2, the running platform may not support v2 and there is no
1177 * way to guess it until an IOMMU group gets added to the container.
1178 * So in case it fails with v2, try v1 as a fallback.
1179 */
1180 iommu_type = VFIO_SPAPR_TCE_IOMMU;
1181 continue;
1182 }
1183 error_setg_errno(errp, errno, "Failed to set iommu for container");
1184 return -errno;
1185 }
1186
1187 container->iommu_type = iommu_type;
1188 return 0;
1189}
1190
1191static int vfio_connect_container(VFIOGroup *group, AddressSpace *as,
1192 Error **errp)
1193{
1194 VFIOContainer *container;
1195 int ret, fd;
1196 VFIOAddressSpace *space;
1197
1198 space = vfio_get_address_space(as);
1199
1200 /*
1201 * VFIO is currently incompatible with memory ballooning insofar as the
1202 * madvise to purge (zap) the page from QEMU's address space does not
1203 * interact with the memory API and therefore leaves stale virtual to
1204 * physical mappings in the IOMMU if the page was previously pinned. We
1205 * therefore add a balloon inhibit for each group added to a container,
1206 * whether the container is used individually or shared. This provides
1207 * us with options to allow devices within a group to opt-in and allow
1208 * ballooning, so long as it is done consistently for a group (for instance
1209 * if the device is an mdev device where it is known that the host vendor
1210 * driver will never pin pages outside of the working set of the guest
1211 * driver, which would thus not be ballooning candidates).
1212 *
1213 * The first opportunity to induce pinning occurs here where we attempt to
1214 * attach the group to existing containers within the AddressSpace. If any
1215 * pages are already zapped from the virtual address space, such as from a
1216 * previous ballooning opt-in, new pinning will cause valid mappings to be
1217 * re-established. Likewise, when the overall MemoryListener for a new
1218 * container is registered, a replay of mappings within the AddressSpace
1219 * will occur, re-establishing any previously zapped pages as well.
1220 *
1221 * NB. Balloon inhibiting does not currently block operation of the
1222 * balloon driver or revoke previously pinned pages, it only prevents
1223 * calling madvise to modify the virtual mapping of ballooned pages.
1224 */
1225 qemu_balloon_inhibit(true);
1226
1227 QLIST_FOREACH(container, &space->containers, next) {
1228 if (!ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &container->fd)) {
1229 group->container = container;
1230 QLIST_INSERT_HEAD(&container->group_list, group, container_next);
1231 vfio_kvm_device_add_group(group);
1232 return 0;
1233 }
1234 }
1235
1236 fd = qemu_open("/dev/vfio/vfio", O_RDWR);
1237 if (fd < 0) {
1238 error_setg_errno(errp, errno, "failed to open /dev/vfio/vfio");
1239 ret = -errno;
1240 goto put_space_exit;
1241 }
1242
1243 ret = ioctl(fd, VFIO_GET_API_VERSION);
1244 if (ret != VFIO_API_VERSION) {
1245 error_setg(errp, "supported vfio version: %d, "
1246 "reported version: %d", VFIO_API_VERSION, ret);
1247 ret = -EINVAL;
1248 goto close_fd_exit;
1249 }
1250
1251 container = g_malloc0(sizeof(*container));
1252 container->space = space;
1253 container->fd = fd;
1254 QLIST_INIT(&container->giommu_list);
1255 QLIST_INIT(&container->hostwin_list);
1256
1257 ret = vfio_init_container(container, group->fd, errp);
1258 if (ret) {
1259 goto free_container_exit;
1260 }
1261
1262 switch (container->iommu_type) {
1263 case VFIO_TYPE1v2_IOMMU:
1264 case VFIO_TYPE1_IOMMU:
1265 {
1266 struct vfio_iommu_type1_info info;
1267
1268 /*
1269 * FIXME: This assumes that a Type1 IOMMU can map any 64-bit
1270 * IOVA whatsoever. That's not actually true, but the current
1271 * kernel interface doesn't tell us what it can map, and the
1272 * existing Type1 IOMMUs generally support any IOVA we're
1273 * going to actually try in practice.
1274 */
1275 info.argsz = sizeof(info);
1276 ret = ioctl(fd, VFIO_IOMMU_GET_INFO, &info);
1277 /* Ignore errors */
1278 if (ret || !(info.flags & VFIO_IOMMU_INFO_PGSIZES)) {
1279 /* Assume 4k IOVA page size */
1280 info.iova_pgsizes = 4096;
1281 }
1282 vfio_host_win_add(container, 0, (hwaddr)-1, info.iova_pgsizes);
1283 container->pgsizes = info.iova_pgsizes;
1284 break;
1285 }
1286 case VFIO_SPAPR_TCE_v2_IOMMU:
1287 case VFIO_SPAPR_TCE_IOMMU:
1288 {
1289 struct vfio_iommu_spapr_tce_info info;
1290 bool v2 = container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU;
1291
1292 /*
1293 * The host kernel code implementing VFIO_IOMMU_DISABLE is called
1294 * when container fd is closed so we do not call it explicitly
1295 * in this file.
1296 */
1297 if (!v2) {
1298 ret = ioctl(fd, VFIO_IOMMU_ENABLE);
1299 if (ret) {
1300 error_setg_errno(errp, errno, "failed to enable container");
1301 ret = -errno;
1302 goto free_container_exit;
1303 }
1304 } else {
1305 container->prereg_listener = vfio_prereg_listener;
1306
1307 memory_listener_register(&container->prereg_listener,
1308 &address_space_memory);
1309 if (container->error) {
1310 memory_listener_unregister(&container->prereg_listener);
1311 ret = container->error;
1312 error_setg(errp,
1313 "RAM memory listener initialization failed for container");
1314 goto free_container_exit;
1315 }
1316 }
1317
1318 info.argsz = sizeof(info);
1319 ret = ioctl(fd, VFIO_IOMMU_SPAPR_TCE_GET_INFO, &info);
1320 if (ret) {
1321 error_setg_errno(errp, errno,
1322 "VFIO_IOMMU_SPAPR_TCE_GET_INFO failed");
1323 ret = -errno;
1324 if (v2) {
1325 memory_listener_unregister(&container->prereg_listener);
1326 }
1327 goto free_container_exit;
1328 }
1329
1330 if (v2) {
1331 container->pgsizes = info.ddw.pgsizes;
1332 /*
1333 * There is a default window in just created container.
1334 * To make region_add/del simpler, we better remove this
1335 * window now and let those iommu_listener callbacks
1336 * create/remove them when needed.
1337 */
1338 ret = vfio_spapr_remove_window(container, info.dma32_window_start);
1339 if (ret) {
1340 error_setg_errno(errp, -ret,
1341 "failed to remove existing window");
1342 goto free_container_exit;
1343 }
1344 } else {
1345 /* The default table uses 4K pages */
1346 container->pgsizes = 0x1000;
1347 vfio_host_win_add(container, info.dma32_window_start,
1348 info.dma32_window_start +
1349 info.dma32_window_size - 1,
1350 0x1000);
1351 }
1352 }
1353 }
1354
1355 vfio_kvm_device_add_group(group);
1356
1357 QLIST_INIT(&container->group_list);
1358 QLIST_INSERT_HEAD(&space->containers, container, next);
1359
1360 group->container = container;
1361 QLIST_INSERT_HEAD(&container->group_list, group, container_next);
1362
1363 container->listener = vfio_memory_listener;
1364
1365 memory_listener_register(&container->listener, container->space->as);
1366
1367 if (container->error) {
1368 ret = container->error;
1369 error_setg_errno(errp, -ret,
1370 "memory listener initialization failed for container");
1371 goto listener_release_exit;
1372 }
1373
1374 container->initialized = true;
1375
1376 return 0;
1377listener_release_exit:
1378 QLIST_REMOVE(group, container_next);
1379 QLIST_REMOVE(container, next);
1380 vfio_kvm_device_del_group(group);
1381 vfio_listener_release(container);
1382
1383free_container_exit:
1384 g_free(container);
1385
1386close_fd_exit:
1387 close(fd);
1388
1389put_space_exit:
1390 qemu_balloon_inhibit(false);
1391 vfio_put_address_space(space);
1392
1393 return ret;
1394}
1395
1396static void vfio_disconnect_container(VFIOGroup *group)
1397{
1398 VFIOContainer *container = group->container;
1399
1400 QLIST_REMOVE(group, container_next);
1401 group->container = NULL;
1402
1403 /*
1404 * Explicitly release the listener first before unset container,
1405 * since unset may destroy the backend container if it's the last
1406 * group.
1407 */
1408 if (QLIST_EMPTY(&container->group_list)) {
1409 vfio_listener_release(container);
1410 }
1411
1412 if (ioctl(group->fd, VFIO_GROUP_UNSET_CONTAINER, &container->fd)) {
1413 error_report("vfio: error disconnecting group %d from container",
1414 group->groupid);
1415 }
1416
1417 if (QLIST_EMPTY(&container->group_list)) {
1418 VFIOAddressSpace *space = container->space;
1419 VFIOGuestIOMMU *giommu, *tmp;
1420
1421 QLIST_REMOVE(container, next);
1422
1423 QLIST_FOREACH_SAFE(giommu, &container->giommu_list, giommu_next, tmp) {
1424 memory_region_unregister_iommu_notifier(
1425 MEMORY_REGION(giommu->iommu), &giommu->n);
1426 QLIST_REMOVE(giommu, giommu_next);
1427 g_free(giommu);
1428 }
1429
1430 trace_vfio_disconnect_container(container->fd);
1431 close(container->fd);
1432 g_free(container);
1433
1434 vfio_put_address_space(space);
1435 }
1436}
1437
1438VFIOGroup *vfio_get_group(int groupid, AddressSpace *as, Error **errp)
1439{
1440 VFIOGroup *group;
1441 char path[32];
1442 struct vfio_group_status status = { .argsz = sizeof(status) };
1443
1444 QLIST_FOREACH(group, &vfio_group_list, next) {
1445 if (group->groupid == groupid) {
1446 /* Found it. Now is it already in the right context? */
1447 if (group->container->space->as == as) {
1448 return group;
1449 } else {
1450 error_setg(errp, "group %d used in multiple address spaces",
1451 group->groupid);
1452 return NULL;
1453 }
1454 }
1455 }
1456
1457 group = g_malloc0(sizeof(*group));
1458
1459 snprintf(path, sizeof(path), "/dev/vfio/%d", groupid);
1460 group->fd = qemu_open(path, O_RDWR);
1461 if (group->fd < 0) {
1462 error_setg_errno(errp, errno, "failed to open %s", path);
1463 goto free_group_exit;
1464 }
1465
1466 if (ioctl(group->fd, VFIO_GROUP_GET_STATUS, &status)) {
1467 error_setg_errno(errp, errno, "failed to get group %d status", groupid);
1468 goto close_fd_exit;
1469 }
1470
1471 if (!(status.flags & VFIO_GROUP_FLAGS_VIABLE)) {
1472 error_setg(errp, "group %d is not viable", groupid);
1473 error_append_hint(errp,
1474 "Please ensure all devices within the iommu_group "
1475 "are bound to their vfio bus driver.\n");
1476 goto close_fd_exit;
1477 }
1478
1479 group->groupid = groupid;
1480 QLIST_INIT(&group->device_list);
1481
1482 if (vfio_connect_container(group, as, errp)) {
1483 error_prepend(errp, "failed to setup container for group %d: ",
1484 groupid);
1485 goto close_fd_exit;
1486 }
1487
1488 if (QLIST_EMPTY(&vfio_group_list)) {
1489 qemu_register_reset(vfio_reset_handler, NULL);
1490 }
1491
1492 QLIST_INSERT_HEAD(&vfio_group_list, group, next);
1493
1494 return group;
1495
1496close_fd_exit:
1497 close(group->fd);
1498
1499free_group_exit:
1500 g_free(group);
1501
1502 return NULL;
1503}
1504
1505void vfio_put_group(VFIOGroup *group)
1506{
1507 if (!group || !QLIST_EMPTY(&group->device_list)) {
1508 return;
1509 }
1510
1511 if (!group->balloon_allowed) {
1512 qemu_balloon_inhibit(false);
1513 }
1514 vfio_kvm_device_del_group(group);
1515 vfio_disconnect_container(group);
1516 QLIST_REMOVE(group, next);
1517 trace_vfio_put_group(group->fd);
1518 close(group->fd);
1519 g_free(group);
1520
1521 if (QLIST_EMPTY(&vfio_group_list)) {
1522 qemu_unregister_reset(vfio_reset_handler, NULL);
1523 }
1524}
1525
1526int vfio_get_device(VFIOGroup *group, const char *name,
1527 VFIODevice *vbasedev, Error **errp)
1528{
1529 struct vfio_device_info dev_info = { .argsz = sizeof(dev_info) };
1530 int ret, fd;
1531
1532 fd = ioctl(group->fd, VFIO_GROUP_GET_DEVICE_FD, name);
1533 if (fd < 0) {
1534 error_setg_errno(errp, errno, "error getting device from group %d",
1535 group->groupid);
1536 error_append_hint(errp,
1537 "Verify all devices in group %d are bound to vfio-<bus> "
1538 "or pci-stub and not already in use\n", group->groupid);
1539 return fd;
1540 }
1541
1542 ret = ioctl(fd, VFIO_DEVICE_GET_INFO, &dev_info);
1543 if (ret) {
1544 error_setg_errno(errp, errno, "error getting device info");
1545 close(fd);
1546 return ret;
1547 }
1548
1549 /*
1550 * Clear the balloon inhibitor for this group if the driver knows the
1551 * device operates compatibly with ballooning. Setting must be consistent
1552 * per group, but since compatibility is really only possible with mdev
1553 * currently, we expect singleton groups.
1554 */
1555 if (vbasedev->balloon_allowed != group->balloon_allowed) {
1556 if (!QLIST_EMPTY(&group->device_list)) {
1557 error_setg(errp,
1558 "Inconsistent device balloon setting within group");
1559 close(fd);
1560 return -1;
1561 }
1562
1563 if (!group->balloon_allowed) {
1564 group->balloon_allowed = true;
1565 qemu_balloon_inhibit(false);
1566 }
1567 }
1568
1569 vbasedev->fd = fd;
1570 vbasedev->group = group;
1571 QLIST_INSERT_HEAD(&group->device_list, vbasedev, next);
1572
1573 vbasedev->num_irqs = dev_info.num_irqs;
1574 vbasedev->num_regions = dev_info.num_regions;
1575 vbasedev->flags = dev_info.flags;
1576
1577 trace_vfio_get_device(name, dev_info.flags, dev_info.num_regions,
1578 dev_info.num_irqs);
1579
1580 vbasedev->reset_works = !!(dev_info.flags & VFIO_DEVICE_FLAGS_RESET);
1581 return 0;
1582}
1583
1584void vfio_put_base_device(VFIODevice *vbasedev)
1585{
1586 if (!vbasedev->group) {
1587 return;
1588 }
1589 QLIST_REMOVE(vbasedev, next);
1590 vbasedev->group = NULL;
1591 trace_vfio_put_base_device(vbasedev->fd);
1592 close(vbasedev->fd);
1593}
1594
1595int vfio_get_region_info(VFIODevice *vbasedev, int index,
1596 struct vfio_region_info **info)
1597{
1598 size_t argsz = sizeof(struct vfio_region_info);
1599
1600 *info = g_malloc0(argsz);
1601
1602 (*info)->index = index;
1603retry:
1604 (*info)->argsz = argsz;
1605
1606 if (ioctl(vbasedev->fd, VFIO_DEVICE_GET_REGION_INFO, *info)) {
1607 g_free(*info);
1608 *info = NULL;
1609 return -errno;
1610 }
1611
1612 if ((*info)->argsz > argsz) {
1613 argsz = (*info)->argsz;
1614 *info = g_realloc(*info, argsz);
1615
1616 goto retry;
1617 }
1618
1619 return 0;
1620}
1621
1622int vfio_get_dev_region_info(VFIODevice *vbasedev, uint32_t type,
1623 uint32_t subtype, struct vfio_region_info **info)
1624{
1625 int i;
1626
1627 for (i = 0; i < vbasedev->num_regions; i++) {
1628 struct vfio_info_cap_header *hdr;
1629 struct vfio_region_info_cap_type *cap_type;
1630
1631 if (vfio_get_region_info(vbasedev, i, info)) {
1632 continue;
1633 }
1634
1635 hdr = vfio_get_region_info_cap(*info, VFIO_REGION_INFO_CAP_TYPE);
1636 if (!hdr) {
1637 g_free(*info);
1638 continue;
1639 }
1640
1641 cap_type = container_of(hdr, struct vfio_region_info_cap_type, header);
1642
1643 trace_vfio_get_dev_region(vbasedev->name, i,
1644 cap_type->type, cap_type->subtype);
1645
1646 if (cap_type->type == type && cap_type->subtype == subtype) {
1647 return 0;
1648 }
1649
1650 g_free(*info);
1651 }
1652
1653 *info = NULL;
1654 return -ENODEV;
1655}
1656
1657bool vfio_has_region_cap(VFIODevice *vbasedev, int region, uint16_t cap_type)
1658{
1659 struct vfio_region_info *info = NULL;
1660 bool ret = false;
1661
1662 if (!vfio_get_region_info(vbasedev, region, &info)) {
1663 if (vfio_get_region_info_cap(info, cap_type)) {
1664 ret = true;
1665 }
1666 g_free(info);
1667 }
1668
1669 return ret;
1670}
1671
1672/*
1673 * Interfaces for IBM EEH (Enhanced Error Handling)
1674 */
1675static bool vfio_eeh_container_ok(VFIOContainer *container)
1676{
1677 /*
1678 * As of 2016-03-04 (linux-4.5) the host kernel EEH/VFIO
1679 * implementation is broken if there are multiple groups in a
1680 * container. The hardware works in units of Partitionable
1681 * Endpoints (== IOMMU groups) and the EEH operations naively
1682 * iterate across all groups in the container, without any logic
1683 * to make sure the groups have their state synchronized. For
1684 * certain operations (ENABLE) that might be ok, until an error
1685 * occurs, but for others (GET_STATE) it's clearly broken.
1686 */
1687
1688 /*
1689 * XXX Once fixed kernels exist, test for them here
1690 */
1691
1692 if (QLIST_EMPTY(&container->group_list)) {
1693 return false;
1694 }
1695
1696 if (QLIST_NEXT(QLIST_FIRST(&container->group_list), container_next)) {
1697 return false;
1698 }
1699
1700 return true;
1701}
1702
1703static int vfio_eeh_container_op(VFIOContainer *container, uint32_t op)
1704{
1705 struct vfio_eeh_pe_op pe_op = {
1706 .argsz = sizeof(pe_op),
1707 .op = op,
1708 };
1709 int ret;
1710
1711 if (!vfio_eeh_container_ok(container)) {
1712 error_report("vfio/eeh: EEH_PE_OP 0x%x: "
1713 "kernel requires a container with exactly one group", op);
1714 return -EPERM;
1715 }
1716
1717 ret = ioctl(container->fd, VFIO_EEH_PE_OP, &pe_op);
1718 if (ret < 0) {
1719 error_report("vfio/eeh: EEH_PE_OP 0x%x failed: %m", op);
1720 return -errno;
1721 }
1722
1723 return ret;
1724}
1725
1726static VFIOContainer *vfio_eeh_as_container(AddressSpace *as)
1727{
1728 VFIOAddressSpace *space = vfio_get_address_space(as);
1729 VFIOContainer *container = NULL;
1730
1731 if (QLIST_EMPTY(&space->containers)) {
1732 /* No containers to act on */
1733 goto out;
1734 }
1735
1736 container = QLIST_FIRST(&space->containers);
1737
1738 if (QLIST_NEXT(container, next)) {
1739 /* We don't yet have logic to synchronize EEH state across
1740 * multiple containers */
1741 container = NULL;
1742 goto out;
1743 }
1744
1745out:
1746 vfio_put_address_space(space);
1747 return container;
1748}
1749
1750bool vfio_eeh_as_ok(AddressSpace *as)
1751{
1752 VFIOContainer *container = vfio_eeh_as_container(as);
1753
1754 return (container != NULL) && vfio_eeh_container_ok(container);
1755}
1756
1757int vfio_eeh_as_op(AddressSpace *as, uint32_t op)
1758{
1759 VFIOContainer *container = vfio_eeh_as_container(as);
1760
1761 if (!container) {
1762 return -ENODEV;
1763 }
1764 return vfio_eeh_container_op(container, op);
1765}
1766