2 * generic functions used by VFIO devices
4 * Copyright Red Hat, Inc. 2012
7 * Alex Williamson <alex.williamson@redhat.com>
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
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)
21 #include "qemu/osdep.h"
22 #include <sys/ioctl.h>
24 #include <linux/vfio.h>
26 #include "hw/vfio/vfio-common.h"
27 #include "hw/vfio/vfio.h"
28 #include "exec/address-spaces.h"
29 #include "exec/memory.h"
31 #include "qemu/error-report.h"
32 #include "sysemu/kvm.h"
35 struct vfio_group_head vfio_group_list
=
36 QLIST_HEAD_INITIALIZER(vfio_group_list
);
37 struct vfio_as_head vfio_address_spaces
=
38 QLIST_HEAD_INITIALIZER(vfio_address_spaces
);
42 * We have a single VFIO pseudo device per KVM VM. Once created it lives
43 * for the life of the VM. Closing the file descriptor only drops our
44 * reference to it and the device's reference to kvm. Therefore once
45 * initialized, this file descriptor is only released on QEMU exit and
46 * we'll re-use it should another vfio device be attached before then.
48 static int vfio_kvm_device_fd
= -1;
52 * Common VFIO interrupt disable
54 void vfio_disable_irqindex(VFIODevice
*vbasedev
, int index
)
56 struct vfio_irq_set irq_set
= {
57 .argsz
= sizeof(irq_set
),
58 .flags
= VFIO_IRQ_SET_DATA_NONE
| VFIO_IRQ_SET_ACTION_TRIGGER
,
64 ioctl(vbasedev
->fd
, VFIO_DEVICE_SET_IRQS
, &irq_set
);
67 void vfio_unmask_single_irqindex(VFIODevice
*vbasedev
, int index
)
69 struct vfio_irq_set irq_set
= {
70 .argsz
= sizeof(irq_set
),
71 .flags
= VFIO_IRQ_SET_DATA_NONE
| VFIO_IRQ_SET_ACTION_UNMASK
,
77 ioctl(vbasedev
->fd
, VFIO_DEVICE_SET_IRQS
, &irq_set
);
80 void vfio_mask_single_irqindex(VFIODevice
*vbasedev
, int index
)
82 struct vfio_irq_set irq_set
= {
83 .argsz
= sizeof(irq_set
),
84 .flags
= VFIO_IRQ_SET_DATA_NONE
| VFIO_IRQ_SET_ACTION_MASK
,
90 ioctl(vbasedev
->fd
, VFIO_DEVICE_SET_IRQS
, &irq_set
);
94 * IO Port/MMIO - Beware of the endians, VFIO is always little endian
96 void vfio_region_write(void *opaque
, hwaddr addr
,
97 uint64_t data
, unsigned size
)
99 VFIORegion
*region
= opaque
;
100 VFIODevice
*vbasedev
= region
->vbasedev
;
113 buf
.word
= cpu_to_le16(data
);
116 buf
.dword
= cpu_to_le32(data
);
119 hw_error("vfio: unsupported write size, %d bytes", size
);
123 if (pwrite(vbasedev
->fd
, &buf
, size
, region
->fd_offset
+ addr
) != size
) {
124 error_report("%s(%s:region%d+0x%"HWADDR_PRIx
", 0x%"PRIx64
126 __func__
, vbasedev
->name
, region
->nr
,
130 trace_vfio_region_write(vbasedev
->name
, region
->nr
, addr
, data
, size
);
133 * A read or write to a BAR always signals an INTx EOI. This will
134 * do nothing if not pending (including not in INTx mode). We assume
135 * that a BAR access is in response to an interrupt and that BAR
136 * accesses will service the interrupt. Unfortunately, we don't know
137 * which access will service the interrupt, so we're potentially
138 * getting quite a few host interrupts per guest interrupt.
140 vbasedev
->ops
->vfio_eoi(vbasedev
);
143 uint64_t vfio_region_read(void *opaque
,
144 hwaddr addr
, unsigned size
)
146 VFIORegion
*region
= opaque
;
147 VFIODevice
*vbasedev
= region
->vbasedev
;
156 if (pread(vbasedev
->fd
, &buf
, size
, region
->fd_offset
+ addr
) != size
) {
157 error_report("%s(%s:region%d+0x%"HWADDR_PRIx
", %d) failed: %m",
158 __func__
, vbasedev
->name
, region
->nr
,
167 data
= le16_to_cpu(buf
.word
);
170 data
= le32_to_cpu(buf
.dword
);
173 hw_error("vfio: unsupported read size, %d bytes", size
);
177 trace_vfio_region_read(vbasedev
->name
, region
->nr
, addr
, size
, data
);
179 /* Same as write above */
180 vbasedev
->ops
->vfio_eoi(vbasedev
);
185 const MemoryRegionOps vfio_region_ops
= {
186 .read
= vfio_region_read
,
187 .write
= vfio_region_write
,
188 .endianness
= DEVICE_LITTLE_ENDIAN
,
192 * DMA - Mapping and unmapping for the "type1" IOMMU interface used on x86
194 static int vfio_dma_unmap(VFIOContainer
*container
,
195 hwaddr iova
, ram_addr_t size
)
197 struct vfio_iommu_type1_dma_unmap unmap
= {
198 .argsz
= sizeof(unmap
),
204 if (ioctl(container
->fd
, VFIO_IOMMU_UNMAP_DMA
, &unmap
)) {
205 error_report("VFIO_UNMAP_DMA: %d", -errno
);
212 static int vfio_dma_map(VFIOContainer
*container
, hwaddr iova
,
213 ram_addr_t size
, void *vaddr
, bool readonly
)
215 struct vfio_iommu_type1_dma_map map
= {
216 .argsz
= sizeof(map
),
217 .flags
= VFIO_DMA_MAP_FLAG_READ
,
218 .vaddr
= (__u64
)(uintptr_t)vaddr
,
224 map
.flags
|= VFIO_DMA_MAP_FLAG_WRITE
;
228 * Try the mapping, if it fails with EBUSY, unmap the region and try
229 * again. This shouldn't be necessary, but we sometimes see it in
232 if (ioctl(container
->fd
, VFIO_IOMMU_MAP_DMA
, &map
) == 0 ||
233 (errno
== EBUSY
&& vfio_dma_unmap(container
, iova
, size
) == 0 &&
234 ioctl(container
->fd
, VFIO_IOMMU_MAP_DMA
, &map
) == 0)) {
238 error_report("VFIO_MAP_DMA: %d", -errno
);
242 static bool vfio_listener_skipped_section(MemoryRegionSection
*section
)
244 return (!memory_region_is_ram(section
->mr
) &&
245 !memory_region_is_iommu(section
->mr
)) ||
247 * Sizing an enabled 64-bit BAR can cause spurious mappings to
248 * addresses in the upper part of the 64-bit address space. These
249 * are never accessed by the CPU and beyond the address width of
250 * some IOMMU hardware. TODO: VFIO should tell us the IOMMU width.
252 section
->offset_within_address_space
& (1ULL << 63);
255 static void vfio_iommu_map_notify(Notifier
*n
, void *data
)
257 VFIOGuestIOMMU
*giommu
= container_of(n
, VFIOGuestIOMMU
, n
);
258 VFIOContainer
*container
= giommu
->container
;
259 IOMMUTLBEntry
*iotlb
= data
;
262 hwaddr len
= iotlb
->addr_mask
+ 1;
266 trace_vfio_iommu_map_notify(iotlb
->iova
,
267 iotlb
->iova
+ iotlb
->addr_mask
);
270 * The IOMMU TLB entry we have just covers translation through
271 * this IOMMU to its immediate target. We need to translate
272 * it the rest of the way through to memory.
275 mr
= address_space_translate(&address_space_memory
,
276 iotlb
->translated_addr
,
277 &xlat
, &len
, iotlb
->perm
& IOMMU_WO
);
278 if (!memory_region_is_ram(mr
)) {
279 error_report("iommu map to non memory area %"HWADDR_PRIx
"",
284 * Translation truncates length to the IOMMU page size,
285 * check that it did not truncate too much.
287 if (len
& iotlb
->addr_mask
) {
288 error_report("iommu has granularity incompatible with target AS");
292 if ((iotlb
->perm
& IOMMU_RW
) != IOMMU_NONE
) {
293 vaddr
= memory_region_get_ram_ptr(mr
) + xlat
;
294 ret
= vfio_dma_map(container
, iotlb
->iova
,
295 iotlb
->addr_mask
+ 1, vaddr
,
296 !(iotlb
->perm
& IOMMU_WO
) || mr
->readonly
);
298 error_report("vfio_dma_map(%p, 0x%"HWADDR_PRIx
", "
299 "0x%"HWADDR_PRIx
", %p) = %d (%m)",
300 container
, iotlb
->iova
,
301 iotlb
->addr_mask
+ 1, vaddr
, ret
);
304 ret
= vfio_dma_unmap(container
, iotlb
->iova
, iotlb
->addr_mask
+ 1);
306 error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx
", "
307 "0x%"HWADDR_PRIx
") = %d (%m)",
308 container
, iotlb
->iova
,
309 iotlb
->addr_mask
+ 1, ret
);
316 static hwaddr
vfio_container_granularity(VFIOContainer
*container
)
318 return (hwaddr
)1 << ctz64(container
->iova_pgsizes
);
321 static void vfio_listener_region_add(MemoryListener
*listener
,
322 MemoryRegionSection
*section
)
324 VFIOContainer
*container
= container_of(listener
, VFIOContainer
, listener
);
330 if (vfio_listener_skipped_section(section
)) {
331 trace_vfio_listener_region_add_skip(
332 section
->offset_within_address_space
,
333 section
->offset_within_address_space
+
334 int128_get64(int128_sub(section
->size
, int128_one())));
338 if (unlikely((section
->offset_within_address_space
& ~TARGET_PAGE_MASK
) !=
339 (section
->offset_within_region
& ~TARGET_PAGE_MASK
))) {
340 error_report("%s received unaligned region", __func__
);
344 iova
= TARGET_PAGE_ALIGN(section
->offset_within_address_space
);
345 llend
= int128_make64(section
->offset_within_address_space
);
346 llend
= int128_add(llend
, section
->size
);
347 llend
= int128_and(llend
, int128_exts64(TARGET_PAGE_MASK
));
349 if (int128_ge(int128_make64(iova
), llend
)) {
352 end
= int128_get64(llend
);
354 if ((iova
< container
->min_iova
) || ((end
- 1) > container
->max_iova
)) {
355 error_report("vfio: IOMMU container %p can't map guest IOVA region"
356 " 0x%"HWADDR_PRIx
"..0x%"HWADDR_PRIx
,
357 container
, iova
, end
- 1);
362 memory_region_ref(section
->mr
);
364 if (memory_region_is_iommu(section
->mr
)) {
365 VFIOGuestIOMMU
*giommu
;
367 trace_vfio_listener_region_add_iommu(iova
, end
- 1);
369 * FIXME: We should do some checking to see if the
370 * capabilities of the host VFIO IOMMU are adequate to model
373 * FIXME: For VFIO iommu types which have KVM acceleration to
374 * avoid bouncing all map/unmaps through qemu this way, this
375 * would be the right place to wire that up (tell the KVM
376 * device emulation the VFIO iommu handles to use).
378 giommu
= g_malloc0(sizeof(*giommu
));
379 giommu
->iommu
= section
->mr
;
380 giommu
->container
= container
;
381 giommu
->n
.notify
= vfio_iommu_map_notify
;
382 QLIST_INSERT_HEAD(&container
->giommu_list
, giommu
, giommu_next
);
384 memory_region_register_iommu_notifier(giommu
->iommu
, &giommu
->n
);
385 memory_region_iommu_replay(giommu
->iommu
, &giommu
->n
,
386 vfio_container_granularity(container
),
392 /* Here we assume that memory_region_is_ram(section->mr)==true */
394 vaddr
= memory_region_get_ram_ptr(section
->mr
) +
395 section
->offset_within_region
+
396 (iova
- section
->offset_within_address_space
);
398 trace_vfio_listener_region_add_ram(iova
, end
- 1, vaddr
);
400 ret
= vfio_dma_map(container
, iova
, end
- iova
, vaddr
, section
->readonly
);
402 error_report("vfio_dma_map(%p, 0x%"HWADDR_PRIx
", "
403 "0x%"HWADDR_PRIx
", %p) = %d (%m)",
404 container
, iova
, end
- iova
, vaddr
, ret
);
412 * On the initfn path, store the first error in the container so we
413 * can gracefully fail. Runtime, there's not much we can do other
414 * than throw a hardware error.
416 if (!container
->initialized
) {
417 if (!container
->error
) {
418 container
->error
= ret
;
421 hw_error("vfio: DMA mapping failed, unable to continue");
425 static void vfio_listener_region_del(MemoryListener
*listener
,
426 MemoryRegionSection
*section
)
428 VFIOContainer
*container
= container_of(listener
, VFIOContainer
, listener
);
432 if (vfio_listener_skipped_section(section
)) {
433 trace_vfio_listener_region_del_skip(
434 section
->offset_within_address_space
,
435 section
->offset_within_address_space
+
436 int128_get64(int128_sub(section
->size
, int128_one())));
440 if (unlikely((section
->offset_within_address_space
& ~TARGET_PAGE_MASK
) !=
441 (section
->offset_within_region
& ~TARGET_PAGE_MASK
))) {
442 error_report("%s received unaligned region", __func__
);
446 if (memory_region_is_iommu(section
->mr
)) {
447 VFIOGuestIOMMU
*giommu
;
449 QLIST_FOREACH(giommu
, &container
->giommu_list
, giommu_next
) {
450 if (giommu
->iommu
== section
->mr
) {
451 memory_region_unregister_iommu_notifier(&giommu
->n
);
452 QLIST_REMOVE(giommu
, giommu_next
);
459 * FIXME: We assume the one big unmap below is adequate to
460 * remove any individual page mappings in the IOMMU which
461 * might have been copied into VFIO. This works for a page table
462 * based IOMMU where a big unmap flattens a large range of IO-PTEs.
463 * That may not be true for all IOMMU types.
467 iova
= TARGET_PAGE_ALIGN(section
->offset_within_address_space
);
468 end
= (section
->offset_within_address_space
+ int128_get64(section
->size
)) &
475 trace_vfio_listener_region_del(iova
, end
- 1);
477 ret
= vfio_dma_unmap(container
, iova
, end
- iova
);
478 memory_region_unref(section
->mr
);
480 error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx
", "
481 "0x%"HWADDR_PRIx
") = %d (%m)",
482 container
, iova
, end
- iova
, ret
);
486 static const MemoryListener vfio_memory_listener
= {
487 .region_add
= vfio_listener_region_add
,
488 .region_del
= vfio_listener_region_del
,
491 static void vfio_listener_release(VFIOContainer
*container
)
493 memory_listener_unregister(&container
->listener
);
496 int vfio_mmap_region(Object
*obj
, VFIORegion
*region
,
497 MemoryRegion
*mem
, MemoryRegion
*submem
,
498 void **map
, size_t size
, off_t offset
,
502 VFIODevice
*vbasedev
= region
->vbasedev
;
504 if (!vbasedev
->no_mmap
&& size
&& region
->flags
&
505 VFIO_REGION_INFO_FLAG_MMAP
) {
508 if (region
->flags
& VFIO_REGION_INFO_FLAG_READ
) {
512 if (region
->flags
& VFIO_REGION_INFO_FLAG_WRITE
) {
516 *map
= mmap(NULL
, size
, prot
, MAP_SHARED
,
518 region
->fd_offset
+ offset
);
519 if (*map
== MAP_FAILED
) {
525 memory_region_init_ram_ptr(submem
, obj
, name
, size
, *map
);
526 memory_region_set_skip_dump(submem
);
529 /* Create a zero sized sub-region to make cleanup easy. */
530 memory_region_init(submem
, obj
, name
, 0);
533 memory_region_add_subregion(mem
, offset
, submem
);
538 void vfio_reset_handler(void *opaque
)
541 VFIODevice
*vbasedev
;
543 QLIST_FOREACH(group
, &vfio_group_list
, next
) {
544 QLIST_FOREACH(vbasedev
, &group
->device_list
, next
) {
545 vbasedev
->ops
->vfio_compute_needs_reset(vbasedev
);
549 QLIST_FOREACH(group
, &vfio_group_list
, next
) {
550 QLIST_FOREACH(vbasedev
, &group
->device_list
, next
) {
551 if (vbasedev
->needs_reset
) {
552 vbasedev
->ops
->vfio_hot_reset_multi(vbasedev
);
558 static void vfio_kvm_device_add_group(VFIOGroup
*group
)
561 struct kvm_device_attr attr
= {
562 .group
= KVM_DEV_VFIO_GROUP
,
563 .attr
= KVM_DEV_VFIO_GROUP_ADD
,
564 .addr
= (uint64_t)(unsigned long)&group
->fd
,
567 if (!kvm_enabled()) {
571 if (vfio_kvm_device_fd
< 0) {
572 struct kvm_create_device cd
= {
573 .type
= KVM_DEV_TYPE_VFIO
,
576 if (kvm_vm_ioctl(kvm_state
, KVM_CREATE_DEVICE
, &cd
)) {
577 error_report("Failed to create KVM VFIO device: %m");
581 vfio_kvm_device_fd
= cd
.fd
;
584 if (ioctl(vfio_kvm_device_fd
, KVM_SET_DEVICE_ATTR
, &attr
)) {
585 error_report("Failed to add group %d to KVM VFIO device: %m",
591 static void vfio_kvm_device_del_group(VFIOGroup
*group
)
594 struct kvm_device_attr attr
= {
595 .group
= KVM_DEV_VFIO_GROUP
,
596 .attr
= KVM_DEV_VFIO_GROUP_DEL
,
597 .addr
= (uint64_t)(unsigned long)&group
->fd
,
600 if (vfio_kvm_device_fd
< 0) {
604 if (ioctl(vfio_kvm_device_fd
, KVM_SET_DEVICE_ATTR
, &attr
)) {
605 error_report("Failed to remove group %d from KVM VFIO device: %m",
611 static VFIOAddressSpace
*vfio_get_address_space(AddressSpace
*as
)
613 VFIOAddressSpace
*space
;
615 QLIST_FOREACH(space
, &vfio_address_spaces
, list
) {
616 if (space
->as
== as
) {
621 /* No suitable VFIOAddressSpace, create a new one */
622 space
= g_malloc0(sizeof(*space
));
624 QLIST_INIT(&space
->containers
);
626 QLIST_INSERT_HEAD(&vfio_address_spaces
, space
, list
);
631 static void vfio_put_address_space(VFIOAddressSpace
*space
)
633 if (QLIST_EMPTY(&space
->containers
)) {
634 QLIST_REMOVE(space
, list
);
639 static int vfio_connect_container(VFIOGroup
*group
, AddressSpace
*as
)
641 VFIOContainer
*container
;
643 VFIOAddressSpace
*space
;
645 space
= vfio_get_address_space(as
);
647 QLIST_FOREACH(container
, &space
->containers
, next
) {
648 if (!ioctl(group
->fd
, VFIO_GROUP_SET_CONTAINER
, &container
->fd
)) {
649 group
->container
= container
;
650 QLIST_INSERT_HEAD(&container
->group_list
, group
, container_next
);
655 fd
= qemu_open("/dev/vfio/vfio", O_RDWR
);
657 error_report("vfio: failed to open /dev/vfio/vfio: %m");
662 ret
= ioctl(fd
, VFIO_GET_API_VERSION
);
663 if (ret
!= VFIO_API_VERSION
) {
664 error_report("vfio: supported vfio version: %d, "
665 "reported version: %d", VFIO_API_VERSION
, ret
);
670 container
= g_malloc0(sizeof(*container
));
671 container
->space
= space
;
673 if (ioctl(fd
, VFIO_CHECK_EXTENSION
, VFIO_TYPE1_IOMMU
) ||
674 ioctl(fd
, VFIO_CHECK_EXTENSION
, VFIO_TYPE1v2_IOMMU
)) {
675 bool v2
= !!ioctl(fd
, VFIO_CHECK_EXTENSION
, VFIO_TYPE1v2_IOMMU
);
676 struct vfio_iommu_type1_info info
;
678 ret
= ioctl(group
->fd
, VFIO_GROUP_SET_CONTAINER
, &fd
);
680 error_report("vfio: failed to set group container: %m");
682 goto free_container_exit
;
685 ret
= ioctl(fd
, VFIO_SET_IOMMU
,
686 v2
? VFIO_TYPE1v2_IOMMU
: VFIO_TYPE1_IOMMU
);
688 error_report("vfio: failed to set iommu for container: %m");
690 goto free_container_exit
;
694 * FIXME: This assumes that a Type1 IOMMU can map any 64-bit
695 * IOVA whatsoever. That's not actually true, but the current
696 * kernel interface doesn't tell us what it can map, and the
697 * existing Type1 IOMMUs generally support any IOVA we're
698 * going to actually try in practice.
700 container
->min_iova
= 0;
701 container
->max_iova
= (hwaddr
)-1;
703 /* Assume just 4K IOVA page size */
704 container
->iova_pgsizes
= 0x1000;
705 info
.argsz
= sizeof(info
);
706 ret
= ioctl(fd
, VFIO_IOMMU_GET_INFO
, &info
);
708 if ((ret
== 0) && (info
.flags
& VFIO_IOMMU_INFO_PGSIZES
)) {
709 container
->iova_pgsizes
= info
.iova_pgsizes
;
711 } else if (ioctl(fd
, VFIO_CHECK_EXTENSION
, VFIO_SPAPR_TCE_IOMMU
)) {
712 struct vfio_iommu_spapr_tce_info info
;
714 ret
= ioctl(group
->fd
, VFIO_GROUP_SET_CONTAINER
, &fd
);
716 error_report("vfio: failed to set group container: %m");
718 goto free_container_exit
;
720 ret
= ioctl(fd
, VFIO_SET_IOMMU
, VFIO_SPAPR_TCE_IOMMU
);
722 error_report("vfio: failed to set iommu for container: %m");
724 goto free_container_exit
;
728 * The host kernel code implementing VFIO_IOMMU_DISABLE is called
729 * when container fd is closed so we do not call it explicitly
732 ret
= ioctl(fd
, VFIO_IOMMU_ENABLE
);
734 error_report("vfio: failed to enable container: %m");
736 goto free_container_exit
;
740 * This only considers the host IOMMU's 32-bit window. At
741 * some point we need to add support for the optional 64-bit
742 * window and dynamic windows
744 info
.argsz
= sizeof(info
);
745 ret
= ioctl(fd
, VFIO_IOMMU_SPAPR_TCE_GET_INFO
, &info
);
747 error_report("vfio: VFIO_IOMMU_SPAPR_TCE_GET_INFO failed: %m");
749 goto free_container_exit
;
751 container
->min_iova
= info
.dma32_window_start
;
752 container
->max_iova
= container
->min_iova
+ info
.dma32_window_size
- 1;
754 /* Assume just 4K IOVA pages for now */
755 container
->iova_pgsizes
= 0x1000;
757 error_report("vfio: No available IOMMU models");
759 goto free_container_exit
;
762 container
->listener
= vfio_memory_listener
;
764 memory_listener_register(&container
->listener
, container
->space
->as
);
766 if (container
->error
) {
767 ret
= container
->error
;
768 error_report("vfio: memory listener initialization failed for container");
769 goto listener_release_exit
;
772 container
->initialized
= true;
774 QLIST_INIT(&container
->group_list
);
775 QLIST_INSERT_HEAD(&space
->containers
, container
, next
);
777 group
->container
= container
;
778 QLIST_INSERT_HEAD(&container
->group_list
, group
, container_next
);
781 listener_release_exit
:
782 vfio_listener_release(container
);
791 vfio_put_address_space(space
);
796 static void vfio_disconnect_container(VFIOGroup
*group
)
798 VFIOContainer
*container
= group
->container
;
800 if (ioctl(group
->fd
, VFIO_GROUP_UNSET_CONTAINER
, &container
->fd
)) {
801 error_report("vfio: error disconnecting group %d from container",
805 QLIST_REMOVE(group
, container_next
);
806 group
->container
= NULL
;
808 if (QLIST_EMPTY(&container
->group_list
)) {
809 VFIOAddressSpace
*space
= container
->space
;
810 VFIOGuestIOMMU
*giommu
, *tmp
;
812 vfio_listener_release(container
);
813 QLIST_REMOVE(container
, next
);
815 QLIST_FOREACH_SAFE(giommu
, &container
->giommu_list
, giommu_next
, tmp
) {
816 memory_region_unregister_iommu_notifier(&giommu
->n
);
817 QLIST_REMOVE(giommu
, giommu_next
);
821 trace_vfio_disconnect_container(container
->fd
);
822 close(container
->fd
);
825 vfio_put_address_space(space
);
829 VFIOGroup
*vfio_get_group(int groupid
, AddressSpace
*as
)
833 struct vfio_group_status status
= { .argsz
= sizeof(status
) };
835 QLIST_FOREACH(group
, &vfio_group_list
, next
) {
836 if (group
->groupid
== groupid
) {
837 /* Found it. Now is it already in the right context? */
838 if (group
->container
->space
->as
== as
) {
841 error_report("vfio: group %d used in multiple address spaces",
848 group
= g_malloc0(sizeof(*group
));
850 snprintf(path
, sizeof(path
), "/dev/vfio/%d", groupid
);
851 group
->fd
= qemu_open(path
, O_RDWR
);
853 error_report("vfio: error opening %s: %m", path
);
854 goto free_group_exit
;
857 if (ioctl(group
->fd
, VFIO_GROUP_GET_STATUS
, &status
)) {
858 error_report("vfio: error getting group status: %m");
862 if (!(status
.flags
& VFIO_GROUP_FLAGS_VIABLE
)) {
863 error_report("vfio: error, group %d is not viable, please ensure "
864 "all devices within the iommu_group are bound to their "
865 "vfio bus driver.", groupid
);
869 group
->groupid
= groupid
;
870 QLIST_INIT(&group
->device_list
);
872 if (vfio_connect_container(group
, as
)) {
873 error_report("vfio: failed to setup container for group %d", groupid
);
877 if (QLIST_EMPTY(&vfio_group_list
)) {
878 qemu_register_reset(vfio_reset_handler
, NULL
);
881 QLIST_INSERT_HEAD(&vfio_group_list
, group
, next
);
883 vfio_kvm_device_add_group(group
);
896 void vfio_put_group(VFIOGroup
*group
)
898 if (!group
|| !QLIST_EMPTY(&group
->device_list
)) {
902 vfio_kvm_device_del_group(group
);
903 vfio_disconnect_container(group
);
904 QLIST_REMOVE(group
, next
);
905 trace_vfio_put_group(group
->fd
);
909 if (QLIST_EMPTY(&vfio_group_list
)) {
910 qemu_unregister_reset(vfio_reset_handler
, NULL
);
914 int vfio_get_device(VFIOGroup
*group
, const char *name
,
915 VFIODevice
*vbasedev
)
917 struct vfio_device_info dev_info
= { .argsz
= sizeof(dev_info
) };
920 fd
= ioctl(group
->fd
, VFIO_GROUP_GET_DEVICE_FD
, name
);
922 error_report("vfio: error getting device %s from group %d: %m",
923 name
, group
->groupid
);
924 error_printf("Verify all devices in group %d are bound to vfio-<bus> "
925 "or pci-stub and not already in use\n", group
->groupid
);
929 ret
= ioctl(fd
, VFIO_DEVICE_GET_INFO
, &dev_info
);
931 error_report("vfio: error getting device info: %m");
937 vbasedev
->group
= group
;
938 QLIST_INSERT_HEAD(&group
->device_list
, vbasedev
, next
);
940 vbasedev
->num_irqs
= dev_info
.num_irqs
;
941 vbasedev
->num_regions
= dev_info
.num_regions
;
942 vbasedev
->flags
= dev_info
.flags
;
944 trace_vfio_get_device(name
, dev_info
.flags
, dev_info
.num_regions
,
947 vbasedev
->reset_works
= !!(dev_info
.flags
& VFIO_DEVICE_FLAGS_RESET
);
951 void vfio_put_base_device(VFIODevice
*vbasedev
)
953 if (!vbasedev
->group
) {
956 QLIST_REMOVE(vbasedev
, next
);
957 vbasedev
->group
= NULL
;
958 trace_vfio_put_base_device(vbasedev
->fd
);
962 static int vfio_container_do_ioctl(AddressSpace
*as
, int32_t groupid
,
963 int req
, void *param
)
966 VFIOContainer
*container
;
969 group
= vfio_get_group(groupid
, as
);
971 error_report("vfio: group %d not registered", groupid
);
975 container
= group
->container
;
976 if (group
->container
) {
977 ret
= ioctl(container
->fd
, req
, param
);
979 error_report("vfio: failed to ioctl %d to container: ret=%d, %s",
980 _IOC_NR(req
) - VFIO_BASE
, ret
, strerror(errno
));
984 vfio_put_group(group
);
989 int vfio_container_ioctl(AddressSpace
*as
, int32_t groupid
,
990 int req
, void *param
)
992 /* We allow only certain ioctls to the container */
994 case VFIO_CHECK_EXTENSION
:
995 case VFIO_IOMMU_SPAPR_TCE_GET_INFO
:
999 /* Return an error on unknown requests */
1000 error_report("vfio: unsupported ioctl %X", req
);
1004 return vfio_container_do_ioctl(as
, groupid
, req
, param
);