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/kvm.h>
26 #include <linux/vfio.h>
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"
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 "sysemu/runstate.h"
41 #include "qapi/error.h"
42 #include "migration/migration.h"
43 #include "sysemu/tpm.h"
45 VFIOGroupList vfio_group_list
=
46 QLIST_HEAD_INITIALIZER(vfio_group_list
);
47 static QLIST_HEAD(, VFIOAddressSpace
) vfio_address_spaces
=
48 QLIST_HEAD_INITIALIZER(vfio_address_spaces
);
52 * We have a single VFIO pseudo device per KVM VM. Once created it lives
53 * for the life of the VM. Closing the file descriptor only drops our
54 * reference to it and the device's reference to kvm. Therefore once
55 * initialized, this file descriptor is only released on QEMU exit and
56 * we'll re-use it should another vfio device be attached before then.
58 static int vfio_kvm_device_fd
= -1;
62 * Common VFIO interrupt disable
64 void vfio_disable_irqindex(VFIODevice
*vbasedev
, int index
)
66 struct vfio_irq_set irq_set
= {
67 .argsz
= sizeof(irq_set
),
68 .flags
= VFIO_IRQ_SET_DATA_NONE
| VFIO_IRQ_SET_ACTION_TRIGGER
,
74 ioctl(vbasedev
->fd
, VFIO_DEVICE_SET_IRQS
, &irq_set
);
77 void vfio_unmask_single_irqindex(VFIODevice
*vbasedev
, int index
)
79 struct vfio_irq_set irq_set
= {
80 .argsz
= sizeof(irq_set
),
81 .flags
= VFIO_IRQ_SET_DATA_NONE
| VFIO_IRQ_SET_ACTION_UNMASK
,
87 ioctl(vbasedev
->fd
, VFIO_DEVICE_SET_IRQS
, &irq_set
);
90 void vfio_mask_single_irqindex(VFIODevice
*vbasedev
, int index
)
92 struct vfio_irq_set irq_set
= {
93 .argsz
= sizeof(irq_set
),
94 .flags
= VFIO_IRQ_SET_DATA_NONE
| VFIO_IRQ_SET_ACTION_MASK
,
100 ioctl(vbasedev
->fd
, VFIO_DEVICE_SET_IRQS
, &irq_set
);
103 static inline const char *action_to_str(int action
)
106 case VFIO_IRQ_SET_ACTION_MASK
:
108 case VFIO_IRQ_SET_ACTION_UNMASK
:
110 case VFIO_IRQ_SET_ACTION_TRIGGER
:
113 return "UNKNOWN ACTION";
117 static const char *index_to_str(VFIODevice
*vbasedev
, int index
)
119 if (vbasedev
->type
!= VFIO_DEVICE_TYPE_PCI
) {
124 case VFIO_PCI_INTX_IRQ_INDEX
:
126 case VFIO_PCI_MSI_IRQ_INDEX
:
128 case VFIO_PCI_MSIX_IRQ_INDEX
:
130 case VFIO_PCI_ERR_IRQ_INDEX
:
132 case VFIO_PCI_REQ_IRQ_INDEX
:
139 static int vfio_ram_block_discard_disable(VFIOContainer
*container
, bool state
)
141 switch (container
->iommu_type
) {
142 case VFIO_TYPE1v2_IOMMU
:
143 case VFIO_TYPE1_IOMMU
:
145 * We support coordinated discarding of RAM via the RamDiscardManager.
147 return ram_block_uncoordinated_discard_disable(state
);
150 * VFIO_SPAPR_TCE_IOMMU most probably works just fine with
151 * RamDiscardManager, however, it is completely untested.
153 * VFIO_SPAPR_TCE_v2_IOMMU with "DMA memory preregistering" does
154 * completely the opposite of managing mapping/pinning dynamically as
155 * required by RamDiscardManager. We would have to special-case sections
156 * with a RamDiscardManager.
158 return ram_block_discard_disable(state
);
162 int vfio_set_irq_signaling(VFIODevice
*vbasedev
, int index
, int subindex
,
163 int action
, int fd
, Error
**errp
)
165 struct vfio_irq_set
*irq_set
;
170 argsz
= sizeof(*irq_set
) + sizeof(*pfd
);
172 irq_set
= g_malloc0(argsz
);
173 irq_set
->argsz
= argsz
;
174 irq_set
->flags
= VFIO_IRQ_SET_DATA_EVENTFD
| action
;
175 irq_set
->index
= index
;
176 irq_set
->start
= subindex
;
178 pfd
= (int32_t *)&irq_set
->data
;
181 if (ioctl(vbasedev
->fd
, VFIO_DEVICE_SET_IRQS
, irq_set
)) {
190 error_setg_errno(errp
, -ret
, "VFIO_DEVICE_SET_IRQS failure");
192 name
= index_to_str(vbasedev
, index
);
194 error_prepend(errp
, "%s-%d: ", name
, subindex
);
196 error_prepend(errp
, "index %d-%d: ", index
, subindex
);
199 "Failed to %s %s eventfd signaling for interrupt ",
200 fd
< 0 ? "tear down" : "set up", action_to_str(action
));
205 * IO Port/MMIO - Beware of the endians, VFIO is always little endian
207 void vfio_region_write(void *opaque
, hwaddr addr
,
208 uint64_t data
, unsigned size
)
210 VFIORegion
*region
= opaque
;
211 VFIODevice
*vbasedev
= region
->vbasedev
;
224 buf
.word
= cpu_to_le16(data
);
227 buf
.dword
= cpu_to_le32(data
);
230 buf
.qword
= cpu_to_le64(data
);
233 hw_error("vfio: unsupported write size, %u bytes", size
);
237 if (pwrite(vbasedev
->fd
, &buf
, size
, region
->fd_offset
+ addr
) != size
) {
238 error_report("%s(%s:region%d+0x%"HWADDR_PRIx
", 0x%"PRIx64
240 __func__
, vbasedev
->name
, region
->nr
,
244 trace_vfio_region_write(vbasedev
->name
, region
->nr
, addr
, data
, size
);
247 * A read or write to a BAR always signals an INTx EOI. This will
248 * do nothing if not pending (including not in INTx mode). We assume
249 * that a BAR access is in response to an interrupt and that BAR
250 * accesses will service the interrupt. Unfortunately, we don't know
251 * which access will service the interrupt, so we're potentially
252 * getting quite a few host interrupts per guest interrupt.
254 vbasedev
->ops
->vfio_eoi(vbasedev
);
257 uint64_t vfio_region_read(void *opaque
,
258 hwaddr addr
, unsigned size
)
260 VFIORegion
*region
= opaque
;
261 VFIODevice
*vbasedev
= region
->vbasedev
;
270 if (pread(vbasedev
->fd
, &buf
, size
, region
->fd_offset
+ addr
) != size
) {
271 error_report("%s(%s:region%d+0x%"HWADDR_PRIx
", %d) failed: %m",
272 __func__
, vbasedev
->name
, region
->nr
,
281 data
= le16_to_cpu(buf
.word
);
284 data
= le32_to_cpu(buf
.dword
);
287 data
= le64_to_cpu(buf
.qword
);
290 hw_error("vfio: unsupported read size, %u bytes", size
);
294 trace_vfio_region_read(vbasedev
->name
, region
->nr
, addr
, size
, data
);
296 /* Same as write above */
297 vbasedev
->ops
->vfio_eoi(vbasedev
);
302 const MemoryRegionOps vfio_region_ops
= {
303 .read
= vfio_region_read
,
304 .write
= vfio_region_write
,
305 .endianness
= DEVICE_LITTLE_ENDIAN
,
307 .min_access_size
= 1,
308 .max_access_size
= 8,
311 .min_access_size
= 1,
312 .max_access_size
= 8,
317 * Device state interfaces
320 bool vfio_mig_active(void)
323 VFIODevice
*vbasedev
;
325 if (QLIST_EMPTY(&vfio_group_list
)) {
329 QLIST_FOREACH(group
, &vfio_group_list
, next
) {
330 QLIST_FOREACH(vbasedev
, &group
->device_list
, next
) {
331 if (vbasedev
->migration_blocker
) {
339 static bool vfio_devices_all_dirty_tracking(VFIOContainer
*container
)
342 VFIODevice
*vbasedev
;
343 MigrationState
*ms
= migrate_get_current();
345 if (!migration_is_setup_or_active(ms
->state
)) {
349 QLIST_FOREACH(group
, &container
->group_list
, container_next
) {
350 QLIST_FOREACH(vbasedev
, &group
->device_list
, next
) {
351 VFIOMigration
*migration
= vbasedev
->migration
;
357 if ((vbasedev
->pre_copy_dirty_page_tracking
== ON_OFF_AUTO_OFF
)
358 && (migration
->device_state
& VFIO_DEVICE_STATE_V1_RUNNING
)) {
366 static bool vfio_devices_all_running_and_saving(VFIOContainer
*container
)
369 VFIODevice
*vbasedev
;
370 MigrationState
*ms
= migrate_get_current();
372 if (!migration_is_setup_or_active(ms
->state
)) {
376 QLIST_FOREACH(group
, &container
->group_list
, container_next
) {
377 QLIST_FOREACH(vbasedev
, &group
->device_list
, next
) {
378 VFIOMigration
*migration
= vbasedev
->migration
;
384 if ((migration
->device_state
& VFIO_DEVICE_STATE_V1_SAVING
) &&
385 (migration
->device_state
& VFIO_DEVICE_STATE_V1_RUNNING
)) {
395 static int vfio_dma_unmap_bitmap(VFIOContainer
*container
,
396 hwaddr iova
, ram_addr_t size
,
397 IOMMUTLBEntry
*iotlb
)
399 struct vfio_iommu_type1_dma_unmap
*unmap
;
400 struct vfio_bitmap
*bitmap
;
401 uint64_t pages
= REAL_HOST_PAGE_ALIGN(size
) / qemu_real_host_page_size();
404 unmap
= g_malloc0(sizeof(*unmap
) + sizeof(*bitmap
));
406 unmap
->argsz
= sizeof(*unmap
) + sizeof(*bitmap
);
409 unmap
->flags
|= VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP
;
410 bitmap
= (struct vfio_bitmap
*)&unmap
->data
;
413 * cpu_physical_memory_set_dirty_lebitmap() supports pages in bitmap of
414 * qemu_real_host_page_size to mark those dirty. Hence set bitmap_pgsize
415 * to qemu_real_host_page_size.
418 bitmap
->pgsize
= qemu_real_host_page_size();
419 bitmap
->size
= ROUND_UP(pages
, sizeof(__u64
) * BITS_PER_BYTE
) /
422 if (bitmap
->size
> container
->max_dirty_bitmap_size
) {
423 error_report("UNMAP: Size of bitmap too big 0x%"PRIx64
,
424 (uint64_t)bitmap
->size
);
429 bitmap
->data
= g_try_malloc0(bitmap
->size
);
435 ret
= ioctl(container
->fd
, VFIO_IOMMU_UNMAP_DMA
, unmap
);
437 cpu_physical_memory_set_dirty_lebitmap((unsigned long *)bitmap
->data
,
438 iotlb
->translated_addr
, pages
);
440 error_report("VFIO_UNMAP_DMA with DIRTY_BITMAP : %m");
443 g_free(bitmap
->data
);
450 * DMA - Mapping and unmapping for the "type1" IOMMU interface used on x86
452 static int vfio_dma_unmap(VFIOContainer
*container
,
453 hwaddr iova
, ram_addr_t size
,
454 IOMMUTLBEntry
*iotlb
)
456 struct vfio_iommu_type1_dma_unmap unmap
= {
457 .argsz
= sizeof(unmap
),
463 if (iotlb
&& container
->dirty_pages_supported
&&
464 vfio_devices_all_running_and_saving(container
)) {
465 return vfio_dma_unmap_bitmap(container
, iova
, size
, iotlb
);
468 while (ioctl(container
->fd
, VFIO_IOMMU_UNMAP_DMA
, &unmap
)) {
470 * The type1 backend has an off-by-one bug in the kernel (71a7d3d78e3c
471 * v4.15) where an overflow in its wrap-around check prevents us from
472 * unmapping the last page of the address space. Test for the error
473 * condition and re-try the unmap excluding the last page. The
474 * expectation is that we've never mapped the last page anyway and this
475 * unmap request comes via vIOMMU support which also makes it unlikely
476 * that this page is used. This bug was introduced well after type1 v2
477 * support was introduced, so we shouldn't need to test for v1. A fix
478 * is queued for kernel v5.0 so this workaround can be removed once
479 * affected kernels are sufficiently deprecated.
481 if (errno
== EINVAL
&& unmap
.size
&& !(unmap
.iova
+ unmap
.size
) &&
482 container
->iommu_type
== VFIO_TYPE1v2_IOMMU
) {
483 trace_vfio_dma_unmap_overflow_workaround();
484 unmap
.size
-= 1ULL << ctz64(container
->pgsizes
);
487 error_report("VFIO_UNMAP_DMA failed: %s", strerror(errno
));
494 static int vfio_dma_map(VFIOContainer
*container
, hwaddr iova
,
495 ram_addr_t size
, void *vaddr
, bool readonly
)
497 struct vfio_iommu_type1_dma_map map
= {
498 .argsz
= sizeof(map
),
499 .flags
= VFIO_DMA_MAP_FLAG_READ
,
500 .vaddr
= (__u64
)(uintptr_t)vaddr
,
506 map
.flags
|= VFIO_DMA_MAP_FLAG_WRITE
;
510 * Try the mapping, if it fails with EBUSY, unmap the region and try
511 * again. This shouldn't be necessary, but we sometimes see it in
514 if (ioctl(container
->fd
, VFIO_IOMMU_MAP_DMA
, &map
) == 0 ||
515 (errno
== EBUSY
&& vfio_dma_unmap(container
, iova
, size
, NULL
) == 0 &&
516 ioctl(container
->fd
, VFIO_IOMMU_MAP_DMA
, &map
) == 0)) {
520 error_report("VFIO_MAP_DMA failed: %s", strerror(errno
));
524 static void vfio_host_win_add(VFIOContainer
*container
,
525 hwaddr min_iova
, hwaddr max_iova
,
526 uint64_t iova_pgsizes
)
528 VFIOHostDMAWindow
*hostwin
;
530 QLIST_FOREACH(hostwin
, &container
->hostwin_list
, hostwin_next
) {
531 if (ranges_overlap(hostwin
->min_iova
,
532 hostwin
->max_iova
- hostwin
->min_iova
+ 1,
534 max_iova
- min_iova
+ 1)) {
535 hw_error("%s: Overlapped IOMMU are not enabled", __func__
);
539 hostwin
= g_malloc0(sizeof(*hostwin
));
541 hostwin
->min_iova
= min_iova
;
542 hostwin
->max_iova
= max_iova
;
543 hostwin
->iova_pgsizes
= iova_pgsizes
;
544 QLIST_INSERT_HEAD(&container
->hostwin_list
, hostwin
, hostwin_next
);
547 static int vfio_host_win_del(VFIOContainer
*container
, hwaddr min_iova
,
550 VFIOHostDMAWindow
*hostwin
;
552 QLIST_FOREACH(hostwin
, &container
->hostwin_list
, hostwin_next
) {
553 if (hostwin
->min_iova
== min_iova
&& hostwin
->max_iova
== max_iova
) {
554 QLIST_REMOVE(hostwin
, hostwin_next
);
563 static bool vfio_listener_skipped_section(MemoryRegionSection
*section
)
565 return (!memory_region_is_ram(section
->mr
) &&
566 !memory_region_is_iommu(section
->mr
)) ||
567 memory_region_is_protected(section
->mr
) ||
569 * Sizing an enabled 64-bit BAR can cause spurious mappings to
570 * addresses in the upper part of the 64-bit address space. These
571 * are never accessed by the CPU and beyond the address width of
572 * some IOMMU hardware. TODO: VFIO should tell us the IOMMU width.
574 section
->offset_within_address_space
& (1ULL << 63);
577 /* Called with rcu_read_lock held. */
578 static bool vfio_get_xlat_addr(IOMMUTLBEntry
*iotlb
, void **vaddr
,
579 ram_addr_t
*ram_addr
, bool *read_only
)
581 bool ret
, mr_has_discard_manager
;
583 ret
= memory_get_xlat_addr(iotlb
, vaddr
, ram_addr
, read_only
,
584 &mr_has_discard_manager
);
585 if (ret
&& mr_has_discard_manager
) {
587 * Malicious VMs might trigger discarding of IOMMU-mapped memory. The
588 * pages will remain pinned inside vfio until unmapped, resulting in a
589 * higher memory consumption than expected. If memory would get
590 * populated again later, there would be an inconsistency between pages
591 * pinned by vfio and pages seen by QEMU. This is the case until
592 * unmapped from the IOMMU (e.g., during device reset).
594 * With malicious guests, we really only care about pinning more memory
595 * than expected. RLIMIT_MEMLOCK set for the user/process can never be
596 * exceeded and can be used to mitigate this problem.
598 warn_report_once("Using vfio with vIOMMUs and coordinated discarding of"
599 " RAM (e.g., virtio-mem) works, however, malicious"
600 " guests can trigger pinning of more memory than"
601 " intended via an IOMMU. It's possible to mitigate "
602 " by setting/adjusting RLIMIT_MEMLOCK.");
607 static void vfio_iommu_map_notify(IOMMUNotifier
*n
, IOMMUTLBEntry
*iotlb
)
609 VFIOGuestIOMMU
*giommu
= container_of(n
, VFIOGuestIOMMU
, n
);
610 VFIOContainer
*container
= giommu
->container
;
611 hwaddr iova
= iotlb
->iova
+ giommu
->iommu_offset
;
615 trace_vfio_iommu_map_notify(iotlb
->perm
== IOMMU_NONE
? "UNMAP" : "MAP",
616 iova
, iova
+ iotlb
->addr_mask
);
618 if (iotlb
->target_as
!= &address_space_memory
) {
619 error_report("Wrong target AS \"%s\", only system memory is allowed",
620 iotlb
->target_as
->name
? iotlb
->target_as
->name
: "none");
626 if ((iotlb
->perm
& IOMMU_RW
) != IOMMU_NONE
) {
629 if (!vfio_get_xlat_addr(iotlb
, &vaddr
, NULL
, &read_only
)) {
633 * vaddr is only valid until rcu_read_unlock(). But after
634 * vfio_dma_map has set up the mapping the pages will be
635 * pinned by the kernel. This makes sure that the RAM backend
636 * of vaddr will always be there, even if the memory object is
637 * destroyed and its backing memory munmap-ed.
639 ret
= vfio_dma_map(container
, iova
,
640 iotlb
->addr_mask
+ 1, vaddr
,
643 error_report("vfio_dma_map(%p, 0x%"HWADDR_PRIx
", "
644 "0x%"HWADDR_PRIx
", %p) = %d (%m)",
646 iotlb
->addr_mask
+ 1, vaddr
, ret
);
649 ret
= vfio_dma_unmap(container
, iova
, iotlb
->addr_mask
+ 1, iotlb
);
651 error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx
", "
652 "0x%"HWADDR_PRIx
") = %d (%m)",
654 iotlb
->addr_mask
+ 1, ret
);
661 static void vfio_ram_discard_notify_discard(RamDiscardListener
*rdl
,
662 MemoryRegionSection
*section
)
664 VFIORamDiscardListener
*vrdl
= container_of(rdl
, VFIORamDiscardListener
,
666 const hwaddr size
= int128_get64(section
->size
);
667 const hwaddr iova
= section
->offset_within_address_space
;
670 /* Unmap with a single call. */
671 ret
= vfio_dma_unmap(vrdl
->container
, iova
, size
, NULL
);
673 error_report("%s: vfio_dma_unmap() failed: %s", __func__
,
678 static int vfio_ram_discard_notify_populate(RamDiscardListener
*rdl
,
679 MemoryRegionSection
*section
)
681 VFIORamDiscardListener
*vrdl
= container_of(rdl
, VFIORamDiscardListener
,
683 const hwaddr end
= section
->offset_within_region
+
684 int128_get64(section
->size
);
685 hwaddr start
, next
, iova
;
690 * Map in (aligned within memory region) minimum granularity, so we can
691 * unmap in minimum granularity later.
693 for (start
= section
->offset_within_region
; start
< end
; start
= next
) {
694 next
= ROUND_UP(start
+ 1, vrdl
->granularity
);
695 next
= MIN(next
, end
);
697 iova
= start
- section
->offset_within_region
+
698 section
->offset_within_address_space
;
699 vaddr
= memory_region_get_ram_ptr(section
->mr
) + start
;
701 ret
= vfio_dma_map(vrdl
->container
, iova
, next
- start
,
702 vaddr
, section
->readonly
);
705 vfio_ram_discard_notify_discard(rdl
, section
);
712 static void vfio_register_ram_discard_listener(VFIOContainer
*container
,
713 MemoryRegionSection
*section
)
715 RamDiscardManager
*rdm
= memory_region_get_ram_discard_manager(section
->mr
);
716 VFIORamDiscardListener
*vrdl
;
718 /* Ignore some corner cases not relevant in practice. */
719 g_assert(QEMU_IS_ALIGNED(section
->offset_within_region
, TARGET_PAGE_SIZE
));
720 g_assert(QEMU_IS_ALIGNED(section
->offset_within_address_space
,
722 g_assert(QEMU_IS_ALIGNED(int128_get64(section
->size
), TARGET_PAGE_SIZE
));
724 vrdl
= g_new0(VFIORamDiscardListener
, 1);
725 vrdl
->container
= container
;
726 vrdl
->mr
= section
->mr
;
727 vrdl
->offset_within_address_space
= section
->offset_within_address_space
;
728 vrdl
->size
= int128_get64(section
->size
);
729 vrdl
->granularity
= ram_discard_manager_get_min_granularity(rdm
,
732 g_assert(vrdl
->granularity
&& is_power_of_2(vrdl
->granularity
));
733 g_assert(container
->pgsizes
&&
734 vrdl
->granularity
>= 1ULL << ctz64(container
->pgsizes
));
736 ram_discard_listener_init(&vrdl
->listener
,
737 vfio_ram_discard_notify_populate
,
738 vfio_ram_discard_notify_discard
, true);
739 ram_discard_manager_register_listener(rdm
, &vrdl
->listener
, section
);
740 QLIST_INSERT_HEAD(&container
->vrdl_list
, vrdl
, next
);
743 * Sanity-check if we have a theoretically problematic setup where we could
744 * exceed the maximum number of possible DMA mappings over time. We assume
745 * that each mapped section in the same address space as a RamDiscardManager
746 * section consumes exactly one DMA mapping, with the exception of
747 * RamDiscardManager sections; i.e., we don't expect to have gIOMMU sections
748 * in the same address space as RamDiscardManager sections.
750 * We assume that each section in the address space consumes one memslot.
751 * We take the number of KVM memory slots as a best guess for the maximum
752 * number of sections in the address space we could have over time,
753 * also consuming DMA mappings.
755 if (container
->dma_max_mappings
) {
756 unsigned int vrdl_count
= 0, vrdl_mappings
= 0, max_memslots
= 512;
760 max_memslots
= kvm_get_max_memslots();
764 QLIST_FOREACH(vrdl
, &container
->vrdl_list
, next
) {
767 start
= QEMU_ALIGN_DOWN(vrdl
->offset_within_address_space
,
769 end
= ROUND_UP(vrdl
->offset_within_address_space
+ vrdl
->size
,
771 vrdl_mappings
+= (end
- start
) / vrdl
->granularity
;
775 if (vrdl_mappings
+ max_memslots
- vrdl_count
>
776 container
->dma_max_mappings
) {
777 warn_report("%s: possibly running out of DMA mappings. E.g., try"
778 " increasing the 'block-size' of virtio-mem devies."
779 " Maximum possible DMA mappings: %d, Maximum possible"
780 " memslots: %d", __func__
, container
->dma_max_mappings
,
786 static void vfio_unregister_ram_discard_listener(VFIOContainer
*container
,
787 MemoryRegionSection
*section
)
789 RamDiscardManager
*rdm
= memory_region_get_ram_discard_manager(section
->mr
);
790 VFIORamDiscardListener
*vrdl
= NULL
;
792 QLIST_FOREACH(vrdl
, &container
->vrdl_list
, next
) {
793 if (vrdl
->mr
== section
->mr
&&
794 vrdl
->offset_within_address_space
==
795 section
->offset_within_address_space
) {
801 hw_error("vfio: Trying to unregister missing RAM discard listener");
804 ram_discard_manager_unregister_listener(rdm
, &vrdl
->listener
);
805 QLIST_REMOVE(vrdl
, next
);
809 static bool vfio_known_safe_misalignment(MemoryRegionSection
*section
)
811 MemoryRegion
*mr
= section
->mr
;
813 if (!TPM_IS_CRB(mr
->owner
)) {
817 /* this is a known safe misaligned region, just trace for debug purpose */
818 trace_vfio_known_safe_misalignment(memory_region_name(mr
),
819 section
->offset_within_address_space
,
820 section
->offset_within_region
,
821 qemu_real_host_page_size());
825 static void vfio_listener_region_add(MemoryListener
*listener
,
826 MemoryRegionSection
*section
)
828 VFIOContainer
*container
= container_of(listener
, VFIOContainer
, listener
);
830 Int128 llend
, llsize
;
833 VFIOHostDMAWindow
*hostwin
;
837 if (vfio_listener_skipped_section(section
)) {
838 trace_vfio_listener_region_add_skip(
839 section
->offset_within_address_space
,
840 section
->offset_within_address_space
+
841 int128_get64(int128_sub(section
->size
, int128_one())));
845 if (unlikely((section
->offset_within_address_space
&
846 ~qemu_real_host_page_mask()) !=
847 (section
->offset_within_region
& ~qemu_real_host_page_mask()))) {
848 if (!vfio_known_safe_misalignment(section
)) {
849 error_report("%s received unaligned region %s iova=0x%"PRIx64
850 " offset_within_region=0x%"PRIx64
851 " qemu_real_host_page_size=0x%"PRIxPTR
,
852 __func__
, memory_region_name(section
->mr
),
853 section
->offset_within_address_space
,
854 section
->offset_within_region
,
855 qemu_real_host_page_size());
860 iova
= REAL_HOST_PAGE_ALIGN(section
->offset_within_address_space
);
861 llend
= int128_make64(section
->offset_within_address_space
);
862 llend
= int128_add(llend
, section
->size
);
863 llend
= int128_and(llend
, int128_exts64(qemu_real_host_page_mask()));
865 if (int128_ge(int128_make64(iova
), llend
)) {
866 if (memory_region_is_ram_device(section
->mr
)) {
867 trace_vfio_listener_region_add_no_dma_map(
868 memory_region_name(section
->mr
),
869 section
->offset_within_address_space
,
870 int128_getlo(section
->size
),
871 qemu_real_host_page_size());
875 end
= int128_get64(int128_sub(llend
, int128_one()));
877 if (container
->iommu_type
== VFIO_SPAPR_TCE_v2_IOMMU
) {
880 /* For now intersections are not allowed, we may relax this later */
881 QLIST_FOREACH(hostwin
, &container
->hostwin_list
, hostwin_next
) {
882 if (ranges_overlap(hostwin
->min_iova
,
883 hostwin
->max_iova
- hostwin
->min_iova
+ 1,
884 section
->offset_within_address_space
,
885 int128_get64(section
->size
))) {
887 "region [0x%"PRIx64
",0x%"PRIx64
"] overlaps with existing"
888 "host DMA window [0x%"PRIx64
",0x%"PRIx64
"]",
889 section
->offset_within_address_space
,
890 section
->offset_within_address_space
+
891 int128_get64(section
->size
) - 1,
892 hostwin
->min_iova
, hostwin
->max_iova
);
897 ret
= vfio_spapr_create_window(container
, section
, &pgsize
);
899 error_setg_errno(&err
, -ret
, "Failed to create SPAPR window");
903 vfio_host_win_add(container
, section
->offset_within_address_space
,
904 section
->offset_within_address_space
+
905 int128_get64(section
->size
) - 1, pgsize
);
909 IOMMUMemoryRegion
*iommu_mr
= IOMMU_MEMORY_REGION(section
->mr
);
910 struct kvm_vfio_spapr_tce param
;
911 struct kvm_device_attr attr
= {
912 .group
= KVM_DEV_VFIO_GROUP
,
913 .attr
= KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE
,
914 .addr
= (uint64_t)(unsigned long)¶m
,
917 if (!memory_region_iommu_get_attr(iommu_mr
, IOMMU_ATTR_SPAPR_TCE_FD
,
919 QLIST_FOREACH(group
, &container
->group_list
, container_next
) {
920 param
.groupfd
= group
->fd
;
921 if (ioctl(vfio_kvm_device_fd
, KVM_SET_DEVICE_ATTR
, &attr
)) {
922 error_report("vfio: failed to setup fd %d "
923 "for a group with fd %d: %s",
924 param
.tablefd
, param
.groupfd
,
928 trace_vfio_spapr_group_attach(param
.groupfd
, param
.tablefd
);
935 hostwin_found
= false;
936 QLIST_FOREACH(hostwin
, &container
->hostwin_list
, hostwin_next
) {
937 if (hostwin
->min_iova
<= iova
&& end
<= hostwin
->max_iova
) {
938 hostwin_found
= true;
943 if (!hostwin_found
) {
944 error_setg(&err
, "Container %p can't map guest IOVA region"
945 " 0x%"HWADDR_PRIx
"..0x%"HWADDR_PRIx
, container
, iova
, end
);
949 memory_region_ref(section
->mr
);
951 if (memory_region_is_iommu(section
->mr
)) {
952 VFIOGuestIOMMU
*giommu
;
953 IOMMUMemoryRegion
*iommu_mr
= IOMMU_MEMORY_REGION(section
->mr
);
956 trace_vfio_listener_region_add_iommu(iova
, end
);
958 * FIXME: For VFIO iommu types which have KVM acceleration to
959 * avoid bouncing all map/unmaps through qemu this way, this
960 * would be the right place to wire that up (tell the KVM
961 * device emulation the VFIO iommu handles to use).
963 giommu
= g_malloc0(sizeof(*giommu
));
964 giommu
->iommu_mr
= iommu_mr
;
965 giommu
->iommu_offset
= section
->offset_within_address_space
-
966 section
->offset_within_region
;
967 giommu
->container
= container
;
968 llend
= int128_add(int128_make64(section
->offset_within_region
),
970 llend
= int128_sub(llend
, int128_one());
971 iommu_idx
= memory_region_iommu_attrs_to_index(iommu_mr
,
972 MEMTXATTRS_UNSPECIFIED
);
973 iommu_notifier_init(&giommu
->n
, vfio_iommu_map_notify
,
974 IOMMU_NOTIFIER_IOTLB_EVENTS
,
975 section
->offset_within_region
,
979 ret
= memory_region_iommu_set_page_size_mask(giommu
->iommu_mr
,
987 ret
= memory_region_register_iommu_notifier(section
->mr
, &giommu
->n
,
993 QLIST_INSERT_HEAD(&container
->giommu_list
, giommu
, giommu_next
);
994 memory_region_iommu_replay(giommu
->iommu_mr
, &giommu
->n
);
999 /* Here we assume that memory_region_is_ram(section->mr)==true */
1002 * For RAM memory regions with a RamDiscardManager, we only want to map the
1003 * actually populated parts - and update the mapping whenever we're notified
1006 if (memory_region_has_ram_discard_manager(section
->mr
)) {
1007 vfio_register_ram_discard_listener(container
, section
);
1011 vaddr
= memory_region_get_ram_ptr(section
->mr
) +
1012 section
->offset_within_region
+
1013 (iova
- section
->offset_within_address_space
);
1015 trace_vfio_listener_region_add_ram(iova
, end
, vaddr
);
1017 llsize
= int128_sub(llend
, int128_make64(iova
));
1019 if (memory_region_is_ram_device(section
->mr
)) {
1020 hwaddr pgmask
= (1ULL << ctz64(hostwin
->iova_pgsizes
)) - 1;
1022 if ((iova
& pgmask
) || (int128_get64(llsize
) & pgmask
)) {
1023 trace_vfio_listener_region_add_no_dma_map(
1024 memory_region_name(section
->mr
),
1025 section
->offset_within_address_space
,
1026 int128_getlo(section
->size
),
1032 ret
= vfio_dma_map(container
, iova
, int128_get64(llsize
),
1033 vaddr
, section
->readonly
);
1035 error_setg(&err
, "vfio_dma_map(%p, 0x%"HWADDR_PRIx
", "
1036 "0x%"HWADDR_PRIx
", %p) = %d (%m)",
1037 container
, iova
, int128_get64(llsize
), vaddr
, ret
);
1038 if (memory_region_is_ram_device(section
->mr
)) {
1039 /* Allow unexpected mappings not to be fatal for RAM devices */
1040 error_report_err(err
);
1049 if (memory_region_is_ram_device(section
->mr
)) {
1050 error_report("failed to vfio_dma_map. pci p2p may not work");
1054 * On the initfn path, store the first error in the container so we
1055 * can gracefully fail. Runtime, there's not much we can do other
1056 * than throw a hardware error.
1058 if (!container
->initialized
) {
1059 if (!container
->error
) {
1060 error_propagate_prepend(&container
->error
, err
,
1062 memory_region_name(section
->mr
));
1067 error_report_err(err
);
1068 hw_error("vfio: DMA mapping failed, unable to continue");
1072 static void vfio_listener_region_del(MemoryListener
*listener
,
1073 MemoryRegionSection
*section
)
1075 VFIOContainer
*container
= container_of(listener
, VFIOContainer
, listener
);
1077 Int128 llend
, llsize
;
1079 bool try_unmap
= true;
1081 if (vfio_listener_skipped_section(section
)) {
1082 trace_vfio_listener_region_del_skip(
1083 section
->offset_within_address_space
,
1084 section
->offset_within_address_space
+
1085 int128_get64(int128_sub(section
->size
, int128_one())));
1089 if (unlikely((section
->offset_within_address_space
&
1090 ~qemu_real_host_page_mask()) !=
1091 (section
->offset_within_region
& ~qemu_real_host_page_mask()))) {
1092 if (!vfio_known_safe_misalignment(section
)) {
1093 error_report("%s received unaligned region %s iova=0x%"PRIx64
1094 " offset_within_region=0x%"PRIx64
1095 " qemu_real_host_page_size=0x%"PRIxPTR
,
1096 __func__
, memory_region_name(section
->mr
),
1097 section
->offset_within_address_space
,
1098 section
->offset_within_region
,
1099 qemu_real_host_page_size());
1104 if (memory_region_is_iommu(section
->mr
)) {
1105 VFIOGuestIOMMU
*giommu
;
1107 QLIST_FOREACH(giommu
, &container
->giommu_list
, giommu_next
) {
1108 if (MEMORY_REGION(giommu
->iommu_mr
) == section
->mr
&&
1109 giommu
->n
.start
== section
->offset_within_region
) {
1110 memory_region_unregister_iommu_notifier(section
->mr
,
1112 QLIST_REMOVE(giommu
, giommu_next
);
1119 * FIXME: We assume the one big unmap below is adequate to
1120 * remove any individual page mappings in the IOMMU which
1121 * might have been copied into VFIO. This works for a page table
1122 * based IOMMU where a big unmap flattens a large range of IO-PTEs.
1123 * That may not be true for all IOMMU types.
1127 iova
= REAL_HOST_PAGE_ALIGN(section
->offset_within_address_space
);
1128 llend
= int128_make64(section
->offset_within_address_space
);
1129 llend
= int128_add(llend
, section
->size
);
1130 llend
= int128_and(llend
, int128_exts64(qemu_real_host_page_mask()));
1132 if (int128_ge(int128_make64(iova
), llend
)) {
1135 end
= int128_get64(int128_sub(llend
, int128_one()));
1137 llsize
= int128_sub(llend
, int128_make64(iova
));
1139 trace_vfio_listener_region_del(iova
, end
);
1141 if (memory_region_is_ram_device(section
->mr
)) {
1143 VFIOHostDMAWindow
*hostwin
;
1144 bool hostwin_found
= false;
1146 QLIST_FOREACH(hostwin
, &container
->hostwin_list
, hostwin_next
) {
1147 if (hostwin
->min_iova
<= iova
&& end
<= hostwin
->max_iova
) {
1148 hostwin_found
= true;
1152 assert(hostwin_found
); /* or region_add() would have failed */
1154 pgmask
= (1ULL << ctz64(hostwin
->iova_pgsizes
)) - 1;
1155 try_unmap
= !((iova
& pgmask
) || (int128_get64(llsize
) & pgmask
));
1156 } else if (memory_region_has_ram_discard_manager(section
->mr
)) {
1157 vfio_unregister_ram_discard_listener(container
, section
);
1158 /* Unregistering will trigger an unmap. */
1163 if (int128_eq(llsize
, int128_2_64())) {
1164 /* The unmap ioctl doesn't accept a full 64-bit span. */
1165 llsize
= int128_rshift(llsize
, 1);
1166 ret
= vfio_dma_unmap(container
, iova
, int128_get64(llsize
), NULL
);
1168 error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx
", "
1169 "0x%"HWADDR_PRIx
") = %d (%m)",
1170 container
, iova
, int128_get64(llsize
), ret
);
1172 iova
+= int128_get64(llsize
);
1174 ret
= vfio_dma_unmap(container
, iova
, int128_get64(llsize
), NULL
);
1176 error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx
", "
1177 "0x%"HWADDR_PRIx
") = %d (%m)",
1178 container
, iova
, int128_get64(llsize
), ret
);
1182 memory_region_unref(section
->mr
);
1184 if (container
->iommu_type
== VFIO_SPAPR_TCE_v2_IOMMU
) {
1185 vfio_spapr_remove_window(container
,
1186 section
->offset_within_address_space
);
1187 if (vfio_host_win_del(container
,
1188 section
->offset_within_address_space
,
1189 section
->offset_within_address_space
+
1190 int128_get64(section
->size
) - 1) < 0) {
1191 hw_error("%s: Cannot delete missing window at %"HWADDR_PRIx
,
1192 __func__
, section
->offset_within_address_space
);
1197 static void vfio_set_dirty_page_tracking(VFIOContainer
*container
, bool start
)
1200 struct vfio_iommu_type1_dirty_bitmap dirty
= {
1201 .argsz
= sizeof(dirty
),
1205 dirty
.flags
= VFIO_IOMMU_DIRTY_PAGES_FLAG_START
;
1207 dirty
.flags
= VFIO_IOMMU_DIRTY_PAGES_FLAG_STOP
;
1210 ret
= ioctl(container
->fd
, VFIO_IOMMU_DIRTY_PAGES
, &dirty
);
1212 error_report("Failed to set dirty tracking flag 0x%x errno: %d",
1213 dirty
.flags
, errno
);
1217 static void vfio_listener_log_global_start(MemoryListener
*listener
)
1219 VFIOContainer
*container
= container_of(listener
, VFIOContainer
, listener
);
1221 vfio_set_dirty_page_tracking(container
, true);
1224 static void vfio_listener_log_global_stop(MemoryListener
*listener
)
1226 VFIOContainer
*container
= container_of(listener
, VFIOContainer
, listener
);
1228 vfio_set_dirty_page_tracking(container
, false);
1231 static int vfio_get_dirty_bitmap(VFIOContainer
*container
, uint64_t iova
,
1232 uint64_t size
, ram_addr_t ram_addr
)
1234 struct vfio_iommu_type1_dirty_bitmap
*dbitmap
;
1235 struct vfio_iommu_type1_dirty_bitmap_get
*range
;
1239 dbitmap
= g_malloc0(sizeof(*dbitmap
) + sizeof(*range
));
1241 dbitmap
->argsz
= sizeof(*dbitmap
) + sizeof(*range
);
1242 dbitmap
->flags
= VFIO_IOMMU_DIRTY_PAGES_FLAG_GET_BITMAP
;
1243 range
= (struct vfio_iommu_type1_dirty_bitmap_get
*)&dbitmap
->data
;
1248 * cpu_physical_memory_set_dirty_lebitmap() supports pages in bitmap of
1249 * qemu_real_host_page_size to mark those dirty. Hence set bitmap's pgsize
1250 * to qemu_real_host_page_size.
1252 range
->bitmap
.pgsize
= qemu_real_host_page_size();
1254 pages
= REAL_HOST_PAGE_ALIGN(range
->size
) / qemu_real_host_page_size();
1255 range
->bitmap
.size
= ROUND_UP(pages
, sizeof(__u64
) * BITS_PER_BYTE
) /
1257 range
->bitmap
.data
= g_try_malloc0(range
->bitmap
.size
);
1258 if (!range
->bitmap
.data
) {
1263 ret
= ioctl(container
->fd
, VFIO_IOMMU_DIRTY_PAGES
, dbitmap
);
1265 error_report("Failed to get dirty bitmap for iova: 0x%"PRIx64
1266 " size: 0x%"PRIx64
" err: %d", (uint64_t)range
->iova
,
1267 (uint64_t)range
->size
, errno
);
1271 cpu_physical_memory_set_dirty_lebitmap((unsigned long *)range
->bitmap
.data
,
1274 trace_vfio_get_dirty_bitmap(container
->fd
, range
->iova
, range
->size
,
1275 range
->bitmap
.size
, ram_addr
);
1277 g_free(range
->bitmap
.data
);
1285 VFIOGuestIOMMU
*giommu
;
1286 } vfio_giommu_dirty_notifier
;
1288 static void vfio_iommu_map_dirty_notify(IOMMUNotifier
*n
, IOMMUTLBEntry
*iotlb
)
1290 vfio_giommu_dirty_notifier
*gdn
= container_of(n
,
1291 vfio_giommu_dirty_notifier
, n
);
1292 VFIOGuestIOMMU
*giommu
= gdn
->giommu
;
1293 VFIOContainer
*container
= giommu
->container
;
1294 hwaddr iova
= iotlb
->iova
+ giommu
->iommu_offset
;
1295 ram_addr_t translated_addr
;
1297 trace_vfio_iommu_map_dirty_notify(iova
, iova
+ iotlb
->addr_mask
);
1299 if (iotlb
->target_as
!= &address_space_memory
) {
1300 error_report("Wrong target AS \"%s\", only system memory is allowed",
1301 iotlb
->target_as
->name
? iotlb
->target_as
->name
: "none");
1306 if (vfio_get_xlat_addr(iotlb
, NULL
, &translated_addr
, NULL
)) {
1309 ret
= vfio_get_dirty_bitmap(container
, iova
, iotlb
->addr_mask
+ 1,
1312 error_report("vfio_iommu_map_dirty_notify(%p, 0x%"HWADDR_PRIx
", "
1313 "0x%"HWADDR_PRIx
") = %d (%m)",
1315 iotlb
->addr_mask
+ 1, ret
);
1321 static int vfio_ram_discard_get_dirty_bitmap(MemoryRegionSection
*section
,
1324 const hwaddr size
= int128_get64(section
->size
);
1325 const hwaddr iova
= section
->offset_within_address_space
;
1326 const ram_addr_t ram_addr
= memory_region_get_ram_addr(section
->mr
) +
1327 section
->offset_within_region
;
1328 VFIORamDiscardListener
*vrdl
= opaque
;
1331 * Sync the whole mapped region (spanning multiple individual mappings)
1334 return vfio_get_dirty_bitmap(vrdl
->container
, iova
, size
, ram_addr
);
1337 static int vfio_sync_ram_discard_listener_dirty_bitmap(VFIOContainer
*container
,
1338 MemoryRegionSection
*section
)
1340 RamDiscardManager
*rdm
= memory_region_get_ram_discard_manager(section
->mr
);
1341 VFIORamDiscardListener
*vrdl
= NULL
;
1343 QLIST_FOREACH(vrdl
, &container
->vrdl_list
, next
) {
1344 if (vrdl
->mr
== section
->mr
&&
1345 vrdl
->offset_within_address_space
==
1346 section
->offset_within_address_space
) {
1352 hw_error("vfio: Trying to sync missing RAM discard listener");
1356 * We only want/can synchronize the bitmap for actually mapped parts -
1357 * which correspond to populated parts. Replay all populated parts.
1359 return ram_discard_manager_replay_populated(rdm
, section
,
1360 vfio_ram_discard_get_dirty_bitmap
,
1364 static int vfio_sync_dirty_bitmap(VFIOContainer
*container
,
1365 MemoryRegionSection
*section
)
1367 ram_addr_t ram_addr
;
1369 if (memory_region_is_iommu(section
->mr
)) {
1370 VFIOGuestIOMMU
*giommu
;
1372 QLIST_FOREACH(giommu
, &container
->giommu_list
, giommu_next
) {
1373 if (MEMORY_REGION(giommu
->iommu_mr
) == section
->mr
&&
1374 giommu
->n
.start
== section
->offset_within_region
) {
1376 vfio_giommu_dirty_notifier gdn
= { .giommu
= giommu
};
1377 int idx
= memory_region_iommu_attrs_to_index(giommu
->iommu_mr
,
1378 MEMTXATTRS_UNSPECIFIED
);
1380 llend
= int128_add(int128_make64(section
->offset_within_region
),
1382 llend
= int128_sub(llend
, int128_one());
1384 iommu_notifier_init(&gdn
.n
,
1385 vfio_iommu_map_dirty_notify
,
1387 section
->offset_within_region
,
1388 int128_get64(llend
),
1390 memory_region_iommu_replay(giommu
->iommu_mr
, &gdn
.n
);
1395 } else if (memory_region_has_ram_discard_manager(section
->mr
)) {
1396 return vfio_sync_ram_discard_listener_dirty_bitmap(container
, section
);
1399 ram_addr
= memory_region_get_ram_addr(section
->mr
) +
1400 section
->offset_within_region
;
1402 return vfio_get_dirty_bitmap(container
,
1403 REAL_HOST_PAGE_ALIGN(section
->offset_within_address_space
),
1404 int128_get64(section
->size
), ram_addr
);
1407 static void vfio_listener_log_sync(MemoryListener
*listener
,
1408 MemoryRegionSection
*section
)
1410 VFIOContainer
*container
= container_of(listener
, VFIOContainer
, listener
);
1412 if (vfio_listener_skipped_section(section
) ||
1413 !container
->dirty_pages_supported
) {
1417 if (vfio_devices_all_dirty_tracking(container
)) {
1418 vfio_sync_dirty_bitmap(container
, section
);
1422 static const MemoryListener vfio_memory_listener
= {
1424 .region_add
= vfio_listener_region_add
,
1425 .region_del
= vfio_listener_region_del
,
1426 .log_global_start
= vfio_listener_log_global_start
,
1427 .log_global_stop
= vfio_listener_log_global_stop
,
1428 .log_sync
= vfio_listener_log_sync
,
1431 static void vfio_listener_release(VFIOContainer
*container
)
1433 memory_listener_unregister(&container
->listener
);
1434 if (container
->iommu_type
== VFIO_SPAPR_TCE_v2_IOMMU
) {
1435 memory_listener_unregister(&container
->prereg_listener
);
1439 static struct vfio_info_cap_header
*
1440 vfio_get_cap(void *ptr
, uint32_t cap_offset
, uint16_t id
)
1442 struct vfio_info_cap_header
*hdr
;
1444 for (hdr
= ptr
+ cap_offset
; hdr
!= ptr
; hdr
= ptr
+ hdr
->next
) {
1445 if (hdr
->id
== id
) {
1453 struct vfio_info_cap_header
*
1454 vfio_get_region_info_cap(struct vfio_region_info
*info
, uint16_t id
)
1456 if (!(info
->flags
& VFIO_REGION_INFO_FLAG_CAPS
)) {
1460 return vfio_get_cap((void *)info
, info
->cap_offset
, id
);
1463 static struct vfio_info_cap_header
*
1464 vfio_get_iommu_type1_info_cap(struct vfio_iommu_type1_info
*info
, uint16_t id
)
1466 if (!(info
->flags
& VFIO_IOMMU_INFO_CAPS
)) {
1470 return vfio_get_cap((void *)info
, info
->cap_offset
, id
);
1473 struct vfio_info_cap_header
*
1474 vfio_get_device_info_cap(struct vfio_device_info
*info
, uint16_t id
)
1476 if (!(info
->flags
& VFIO_DEVICE_FLAGS_CAPS
)) {
1480 return vfio_get_cap((void *)info
, info
->cap_offset
, id
);
1483 bool vfio_get_info_dma_avail(struct vfio_iommu_type1_info
*info
,
1484 unsigned int *avail
)
1486 struct vfio_info_cap_header
*hdr
;
1487 struct vfio_iommu_type1_info_dma_avail
*cap
;
1489 /* If the capability cannot be found, assume no DMA limiting */
1490 hdr
= vfio_get_iommu_type1_info_cap(info
,
1491 VFIO_IOMMU_TYPE1_INFO_DMA_AVAIL
);
1496 if (avail
!= NULL
) {
1498 *avail
= cap
->avail
;
1504 static int vfio_setup_region_sparse_mmaps(VFIORegion
*region
,
1505 struct vfio_region_info
*info
)
1507 struct vfio_info_cap_header
*hdr
;
1508 struct vfio_region_info_cap_sparse_mmap
*sparse
;
1511 hdr
= vfio_get_region_info_cap(info
, VFIO_REGION_INFO_CAP_SPARSE_MMAP
);
1516 sparse
= container_of(hdr
, struct vfio_region_info_cap_sparse_mmap
, header
);
1518 trace_vfio_region_sparse_mmap_header(region
->vbasedev
->name
,
1519 region
->nr
, sparse
->nr_areas
);
1521 region
->mmaps
= g_new0(VFIOMmap
, sparse
->nr_areas
);
1523 for (i
= 0, j
= 0; i
< sparse
->nr_areas
; i
++) {
1524 if (sparse
->areas
[i
].size
) {
1525 trace_vfio_region_sparse_mmap_entry(i
, sparse
->areas
[i
].offset
,
1526 sparse
->areas
[i
].offset
+
1527 sparse
->areas
[i
].size
- 1);
1528 region
->mmaps
[j
].offset
= sparse
->areas
[i
].offset
;
1529 region
->mmaps
[j
].size
= sparse
->areas
[i
].size
;
1534 region
->nr_mmaps
= j
;
1535 region
->mmaps
= g_realloc(region
->mmaps
, j
* sizeof(VFIOMmap
));
1540 int vfio_region_setup(Object
*obj
, VFIODevice
*vbasedev
, VFIORegion
*region
,
1541 int index
, const char *name
)
1543 struct vfio_region_info
*info
;
1546 ret
= vfio_get_region_info(vbasedev
, index
, &info
);
1551 region
->vbasedev
= vbasedev
;
1552 region
->flags
= info
->flags
;
1553 region
->size
= info
->size
;
1554 region
->fd_offset
= info
->offset
;
1558 region
->mem
= g_new0(MemoryRegion
, 1);
1559 memory_region_init_io(region
->mem
, obj
, &vfio_region_ops
,
1560 region
, name
, region
->size
);
1562 if (!vbasedev
->no_mmap
&&
1563 region
->flags
& VFIO_REGION_INFO_FLAG_MMAP
) {
1565 ret
= vfio_setup_region_sparse_mmaps(region
, info
);
1568 region
->nr_mmaps
= 1;
1569 region
->mmaps
= g_new0(VFIOMmap
, region
->nr_mmaps
);
1570 region
->mmaps
[0].offset
= 0;
1571 region
->mmaps
[0].size
= region
->size
;
1578 trace_vfio_region_setup(vbasedev
->name
, index
, name
,
1579 region
->flags
, region
->fd_offset
, region
->size
);
1583 static void vfio_subregion_unmap(VFIORegion
*region
, int index
)
1585 trace_vfio_region_unmap(memory_region_name(®ion
->mmaps
[index
].mem
),
1586 region
->mmaps
[index
].offset
,
1587 region
->mmaps
[index
].offset
+
1588 region
->mmaps
[index
].size
- 1);
1589 memory_region_del_subregion(region
->mem
, ®ion
->mmaps
[index
].mem
);
1590 munmap(region
->mmaps
[index
].mmap
, region
->mmaps
[index
].size
);
1591 object_unparent(OBJECT(®ion
->mmaps
[index
].mem
));
1592 region
->mmaps
[index
].mmap
= NULL
;
1595 int vfio_region_mmap(VFIORegion
*region
)
1604 prot
|= region
->flags
& VFIO_REGION_INFO_FLAG_READ
? PROT_READ
: 0;
1605 prot
|= region
->flags
& VFIO_REGION_INFO_FLAG_WRITE
? PROT_WRITE
: 0;
1607 for (i
= 0; i
< region
->nr_mmaps
; i
++) {
1608 region
->mmaps
[i
].mmap
= mmap(NULL
, region
->mmaps
[i
].size
, prot
,
1609 MAP_SHARED
, region
->vbasedev
->fd
,
1611 region
->mmaps
[i
].offset
);
1612 if (region
->mmaps
[i
].mmap
== MAP_FAILED
) {
1615 trace_vfio_region_mmap_fault(memory_region_name(region
->mem
), i
,
1617 region
->mmaps
[i
].offset
,
1619 region
->mmaps
[i
].offset
+
1620 region
->mmaps
[i
].size
- 1, ret
);
1622 region
->mmaps
[i
].mmap
= NULL
;
1624 for (i
--; i
>= 0; i
--) {
1625 vfio_subregion_unmap(region
, i
);
1631 name
= g_strdup_printf("%s mmaps[%d]",
1632 memory_region_name(region
->mem
), i
);
1633 memory_region_init_ram_device_ptr(®ion
->mmaps
[i
].mem
,
1634 memory_region_owner(region
->mem
),
1635 name
, region
->mmaps
[i
].size
,
1636 region
->mmaps
[i
].mmap
);
1638 memory_region_add_subregion(region
->mem
, region
->mmaps
[i
].offset
,
1639 ®ion
->mmaps
[i
].mem
);
1641 trace_vfio_region_mmap(memory_region_name(®ion
->mmaps
[i
].mem
),
1642 region
->mmaps
[i
].offset
,
1643 region
->mmaps
[i
].offset
+
1644 region
->mmaps
[i
].size
- 1);
1650 void vfio_region_unmap(VFIORegion
*region
)
1658 for (i
= 0; i
< region
->nr_mmaps
; i
++) {
1659 if (region
->mmaps
[i
].mmap
) {
1660 vfio_subregion_unmap(region
, i
);
1665 void vfio_region_exit(VFIORegion
*region
)
1673 for (i
= 0; i
< region
->nr_mmaps
; i
++) {
1674 if (region
->mmaps
[i
].mmap
) {
1675 memory_region_del_subregion(region
->mem
, ®ion
->mmaps
[i
].mem
);
1679 trace_vfio_region_exit(region
->vbasedev
->name
, region
->nr
);
1682 void vfio_region_finalize(VFIORegion
*region
)
1690 for (i
= 0; i
< region
->nr_mmaps
; i
++) {
1691 if (region
->mmaps
[i
].mmap
) {
1692 munmap(region
->mmaps
[i
].mmap
, region
->mmaps
[i
].size
);
1693 object_unparent(OBJECT(®ion
->mmaps
[i
].mem
));
1697 object_unparent(OBJECT(region
->mem
));
1699 g_free(region
->mem
);
1700 g_free(region
->mmaps
);
1702 trace_vfio_region_finalize(region
->vbasedev
->name
, region
->nr
);
1705 region
->mmaps
= NULL
;
1706 region
->nr_mmaps
= 0;
1712 void vfio_region_mmaps_set_enabled(VFIORegion
*region
, bool enabled
)
1720 for (i
= 0; i
< region
->nr_mmaps
; i
++) {
1721 if (region
->mmaps
[i
].mmap
) {
1722 memory_region_set_enabled(®ion
->mmaps
[i
].mem
, enabled
);
1726 trace_vfio_region_mmaps_set_enabled(memory_region_name(region
->mem
),
1730 void vfio_reset_handler(void *opaque
)
1733 VFIODevice
*vbasedev
;
1735 QLIST_FOREACH(group
, &vfio_group_list
, next
) {
1736 QLIST_FOREACH(vbasedev
, &group
->device_list
, next
) {
1737 if (vbasedev
->dev
->realized
) {
1738 vbasedev
->ops
->vfio_compute_needs_reset(vbasedev
);
1743 QLIST_FOREACH(group
, &vfio_group_list
, next
) {
1744 QLIST_FOREACH(vbasedev
, &group
->device_list
, next
) {
1745 if (vbasedev
->dev
->realized
&& vbasedev
->needs_reset
) {
1746 vbasedev
->ops
->vfio_hot_reset_multi(vbasedev
);
1752 static void vfio_kvm_device_add_group(VFIOGroup
*group
)
1755 struct kvm_device_attr attr
= {
1756 .group
= KVM_DEV_VFIO_GROUP
,
1757 .attr
= KVM_DEV_VFIO_GROUP_ADD
,
1758 .addr
= (uint64_t)(unsigned long)&group
->fd
,
1761 if (!kvm_enabled()) {
1765 if (vfio_kvm_device_fd
< 0) {
1766 struct kvm_create_device cd
= {
1767 .type
= KVM_DEV_TYPE_VFIO
,
1770 if (kvm_vm_ioctl(kvm_state
, KVM_CREATE_DEVICE
, &cd
)) {
1771 error_report("Failed to create KVM VFIO device: %m");
1775 vfio_kvm_device_fd
= cd
.fd
;
1778 if (ioctl(vfio_kvm_device_fd
, KVM_SET_DEVICE_ATTR
, &attr
)) {
1779 error_report("Failed to add group %d to KVM VFIO device: %m",
1785 static void vfio_kvm_device_del_group(VFIOGroup
*group
)
1788 struct kvm_device_attr attr
= {
1789 .group
= KVM_DEV_VFIO_GROUP
,
1790 .attr
= KVM_DEV_VFIO_GROUP_DEL
,
1791 .addr
= (uint64_t)(unsigned long)&group
->fd
,
1794 if (vfio_kvm_device_fd
< 0) {
1798 if (ioctl(vfio_kvm_device_fd
, KVM_SET_DEVICE_ATTR
, &attr
)) {
1799 error_report("Failed to remove group %d from KVM VFIO device: %m",
1805 static VFIOAddressSpace
*vfio_get_address_space(AddressSpace
*as
)
1807 VFIOAddressSpace
*space
;
1809 QLIST_FOREACH(space
, &vfio_address_spaces
, list
) {
1810 if (space
->as
== as
) {
1815 /* No suitable VFIOAddressSpace, create a new one */
1816 space
= g_malloc0(sizeof(*space
));
1818 QLIST_INIT(&space
->containers
);
1820 QLIST_INSERT_HEAD(&vfio_address_spaces
, space
, list
);
1825 static void vfio_put_address_space(VFIOAddressSpace
*space
)
1827 if (QLIST_EMPTY(&space
->containers
)) {
1828 QLIST_REMOVE(space
, list
);
1834 * vfio_get_iommu_type - selects the richest iommu_type (v2 first)
1836 static int vfio_get_iommu_type(VFIOContainer
*container
,
1839 int iommu_types
[] = { VFIO_TYPE1v2_IOMMU
, VFIO_TYPE1_IOMMU
,
1840 VFIO_SPAPR_TCE_v2_IOMMU
, VFIO_SPAPR_TCE_IOMMU
};
1843 for (i
= 0; i
< ARRAY_SIZE(iommu_types
); i
++) {
1844 if (ioctl(container
->fd
, VFIO_CHECK_EXTENSION
, iommu_types
[i
])) {
1845 return iommu_types
[i
];
1848 error_setg(errp
, "No available IOMMU models");
1852 static int vfio_init_container(VFIOContainer
*container
, int group_fd
,
1855 int iommu_type
, ret
;
1857 iommu_type
= vfio_get_iommu_type(container
, errp
);
1858 if (iommu_type
< 0) {
1862 ret
= ioctl(group_fd
, VFIO_GROUP_SET_CONTAINER
, &container
->fd
);
1864 error_setg_errno(errp
, errno
, "Failed to set group container");
1868 while (ioctl(container
->fd
, VFIO_SET_IOMMU
, iommu_type
)) {
1869 if (iommu_type
== VFIO_SPAPR_TCE_v2_IOMMU
) {
1871 * On sPAPR, despite the IOMMU subdriver always advertises v1 and
1872 * v2, the running platform may not support v2 and there is no
1873 * way to guess it until an IOMMU group gets added to the container.
1874 * So in case it fails with v2, try v1 as a fallback.
1876 iommu_type
= VFIO_SPAPR_TCE_IOMMU
;
1879 error_setg_errno(errp
, errno
, "Failed to set iommu for container");
1883 container
->iommu_type
= iommu_type
;
1887 static int vfio_get_iommu_info(VFIOContainer
*container
,
1888 struct vfio_iommu_type1_info
**info
)
1891 size_t argsz
= sizeof(struct vfio_iommu_type1_info
);
1893 *info
= g_new0(struct vfio_iommu_type1_info
, 1);
1895 (*info
)->argsz
= argsz
;
1897 if (ioctl(container
->fd
, VFIO_IOMMU_GET_INFO
, *info
)) {
1903 if (((*info
)->argsz
> argsz
)) {
1904 argsz
= (*info
)->argsz
;
1905 *info
= g_realloc(*info
, argsz
);
1912 static struct vfio_info_cap_header
*
1913 vfio_get_iommu_info_cap(struct vfio_iommu_type1_info
*info
, uint16_t id
)
1915 struct vfio_info_cap_header
*hdr
;
1918 if (!(info
->flags
& VFIO_IOMMU_INFO_CAPS
)) {
1922 for (hdr
= ptr
+ info
->cap_offset
; hdr
!= ptr
; hdr
= ptr
+ hdr
->next
) {
1923 if (hdr
->id
== id
) {
1931 static void vfio_get_iommu_info_migration(VFIOContainer
*container
,
1932 struct vfio_iommu_type1_info
*info
)
1934 struct vfio_info_cap_header
*hdr
;
1935 struct vfio_iommu_type1_info_cap_migration
*cap_mig
;
1937 hdr
= vfio_get_iommu_info_cap(info
, VFIO_IOMMU_TYPE1_INFO_CAP_MIGRATION
);
1942 cap_mig
= container_of(hdr
, struct vfio_iommu_type1_info_cap_migration
,
1946 * cpu_physical_memory_set_dirty_lebitmap() supports pages in bitmap of
1947 * qemu_real_host_page_size to mark those dirty.
1949 if (cap_mig
->pgsize_bitmap
& qemu_real_host_page_size()) {
1950 container
->dirty_pages_supported
= true;
1951 container
->max_dirty_bitmap_size
= cap_mig
->max_dirty_bitmap_size
;
1952 container
->dirty_pgsizes
= cap_mig
->pgsize_bitmap
;
1956 static int vfio_connect_container(VFIOGroup
*group
, AddressSpace
*as
,
1959 VFIOContainer
*container
;
1961 VFIOAddressSpace
*space
;
1963 space
= vfio_get_address_space(as
);
1966 * VFIO is currently incompatible with discarding of RAM insofar as the
1967 * madvise to purge (zap) the page from QEMU's address space does not
1968 * interact with the memory API and therefore leaves stale virtual to
1969 * physical mappings in the IOMMU if the page was previously pinned. We
1970 * therefore set discarding broken for each group added to a container,
1971 * whether the container is used individually or shared. This provides
1972 * us with options to allow devices within a group to opt-in and allow
1973 * discarding, so long as it is done consistently for a group (for instance
1974 * if the device is an mdev device where it is known that the host vendor
1975 * driver will never pin pages outside of the working set of the guest
1976 * driver, which would thus not be discarding candidates).
1978 * The first opportunity to induce pinning occurs here where we attempt to
1979 * attach the group to existing containers within the AddressSpace. If any
1980 * pages are already zapped from the virtual address space, such as from
1981 * previous discards, new pinning will cause valid mappings to be
1982 * re-established. Likewise, when the overall MemoryListener for a new
1983 * container is registered, a replay of mappings within the AddressSpace
1984 * will occur, re-establishing any previously zapped pages as well.
1986 * Especially virtio-balloon is currently only prevented from discarding
1987 * new memory, it will not yet set ram_block_discard_set_required() and
1988 * therefore, neither stops us here or deals with the sudden memory
1989 * consumption of inflated memory.
1991 * We do support discarding of memory coordinated via the RamDiscardManager
1992 * with some IOMMU types. vfio_ram_block_discard_disable() handles the
1993 * details once we know which type of IOMMU we are using.
1996 QLIST_FOREACH(container
, &space
->containers
, next
) {
1997 if (!ioctl(group
->fd
, VFIO_GROUP_SET_CONTAINER
, &container
->fd
)) {
1998 ret
= vfio_ram_block_discard_disable(container
, true);
2000 error_setg_errno(errp
, -ret
,
2001 "Cannot set discarding of RAM broken");
2002 if (ioctl(group
->fd
, VFIO_GROUP_UNSET_CONTAINER
,
2004 error_report("vfio: error disconnecting group %d from"
2005 " container", group
->groupid
);
2009 group
->container
= container
;
2010 QLIST_INSERT_HEAD(&container
->group_list
, group
, container_next
);
2011 vfio_kvm_device_add_group(group
);
2016 fd
= qemu_open_old("/dev/vfio/vfio", O_RDWR
);
2018 error_setg_errno(errp
, errno
, "failed to open /dev/vfio/vfio");
2020 goto put_space_exit
;
2023 ret
= ioctl(fd
, VFIO_GET_API_VERSION
);
2024 if (ret
!= VFIO_API_VERSION
) {
2025 error_setg(errp
, "supported vfio version: %d, "
2026 "reported version: %d", VFIO_API_VERSION
, ret
);
2031 container
= g_malloc0(sizeof(*container
));
2032 container
->space
= space
;
2034 container
->error
= NULL
;
2035 container
->dirty_pages_supported
= false;
2036 container
->dma_max_mappings
= 0;
2037 QLIST_INIT(&container
->giommu_list
);
2038 QLIST_INIT(&container
->hostwin_list
);
2039 QLIST_INIT(&container
->vrdl_list
);
2041 ret
= vfio_init_container(container
, group
->fd
, errp
);
2043 goto free_container_exit
;
2046 ret
= vfio_ram_block_discard_disable(container
, true);
2048 error_setg_errno(errp
, -ret
, "Cannot set discarding of RAM broken");
2049 goto free_container_exit
;
2052 switch (container
->iommu_type
) {
2053 case VFIO_TYPE1v2_IOMMU
:
2054 case VFIO_TYPE1_IOMMU
:
2056 struct vfio_iommu_type1_info
*info
;
2058 ret
= vfio_get_iommu_info(container
, &info
);
2060 error_setg_errno(errp
, -ret
, "Failed to get VFIO IOMMU info");
2061 goto enable_discards_exit
;
2064 if (info
->flags
& VFIO_IOMMU_INFO_PGSIZES
) {
2065 container
->pgsizes
= info
->iova_pgsizes
;
2067 container
->pgsizes
= qemu_real_host_page_size();
2070 if (!vfio_get_info_dma_avail(info
, &container
->dma_max_mappings
)) {
2071 container
->dma_max_mappings
= 65535;
2073 vfio_get_iommu_info_migration(container
, info
);
2077 * FIXME: We should parse VFIO_IOMMU_TYPE1_INFO_CAP_IOVA_RANGE
2078 * information to get the actual window extent rather than assume
2079 * a 64-bit IOVA address space.
2081 vfio_host_win_add(container
, 0, (hwaddr
)-1, container
->pgsizes
);
2085 case VFIO_SPAPR_TCE_v2_IOMMU
:
2086 case VFIO_SPAPR_TCE_IOMMU
:
2088 struct vfio_iommu_spapr_tce_info info
;
2089 bool v2
= container
->iommu_type
== VFIO_SPAPR_TCE_v2_IOMMU
;
2092 * The host kernel code implementing VFIO_IOMMU_DISABLE is called
2093 * when container fd is closed so we do not call it explicitly
2097 ret
= ioctl(fd
, VFIO_IOMMU_ENABLE
);
2099 error_setg_errno(errp
, errno
, "failed to enable container");
2101 goto enable_discards_exit
;
2104 container
->prereg_listener
= vfio_prereg_listener
;
2106 memory_listener_register(&container
->prereg_listener
,
2107 &address_space_memory
);
2108 if (container
->error
) {
2109 memory_listener_unregister(&container
->prereg_listener
);
2111 error_propagate_prepend(errp
, container
->error
,
2112 "RAM memory listener initialization failed: ");
2113 goto enable_discards_exit
;
2117 info
.argsz
= sizeof(info
);
2118 ret
= ioctl(fd
, VFIO_IOMMU_SPAPR_TCE_GET_INFO
, &info
);
2120 error_setg_errno(errp
, errno
,
2121 "VFIO_IOMMU_SPAPR_TCE_GET_INFO failed");
2124 memory_listener_unregister(&container
->prereg_listener
);
2126 goto enable_discards_exit
;
2130 container
->pgsizes
= info
.ddw
.pgsizes
;
2132 * There is a default window in just created container.
2133 * To make region_add/del simpler, we better remove this
2134 * window now and let those iommu_listener callbacks
2135 * create/remove them when needed.
2137 ret
= vfio_spapr_remove_window(container
, info
.dma32_window_start
);
2139 error_setg_errno(errp
, -ret
,
2140 "failed to remove existing window");
2141 goto enable_discards_exit
;
2144 /* The default table uses 4K pages */
2145 container
->pgsizes
= 0x1000;
2146 vfio_host_win_add(container
, info
.dma32_window_start
,
2147 info
.dma32_window_start
+
2148 info
.dma32_window_size
- 1,
2154 vfio_kvm_device_add_group(group
);
2156 QLIST_INIT(&container
->group_list
);
2157 QLIST_INSERT_HEAD(&space
->containers
, container
, next
);
2159 group
->container
= container
;
2160 QLIST_INSERT_HEAD(&container
->group_list
, group
, container_next
);
2162 container
->listener
= vfio_memory_listener
;
2164 memory_listener_register(&container
->listener
, container
->space
->as
);
2166 if (container
->error
) {
2168 error_propagate_prepend(errp
, container
->error
,
2169 "memory listener initialization failed: ");
2170 goto listener_release_exit
;
2173 container
->initialized
= true;
2176 listener_release_exit
:
2177 QLIST_REMOVE(group
, container_next
);
2178 QLIST_REMOVE(container
, next
);
2179 vfio_kvm_device_del_group(group
);
2180 vfio_listener_release(container
);
2182 enable_discards_exit
:
2183 vfio_ram_block_discard_disable(container
, false);
2185 free_container_exit
:
2192 vfio_put_address_space(space
);
2197 static void vfio_disconnect_container(VFIOGroup
*group
)
2199 VFIOContainer
*container
= group
->container
;
2201 QLIST_REMOVE(group
, container_next
);
2202 group
->container
= NULL
;
2205 * Explicitly release the listener first before unset container,
2206 * since unset may destroy the backend container if it's the last
2209 if (QLIST_EMPTY(&container
->group_list
)) {
2210 vfio_listener_release(container
);
2213 if (ioctl(group
->fd
, VFIO_GROUP_UNSET_CONTAINER
, &container
->fd
)) {
2214 error_report("vfio: error disconnecting group %d from container",
2218 if (QLIST_EMPTY(&container
->group_list
)) {
2219 VFIOAddressSpace
*space
= container
->space
;
2220 VFIOGuestIOMMU
*giommu
, *tmp
;
2221 VFIOHostDMAWindow
*hostwin
, *next
;
2223 QLIST_REMOVE(container
, next
);
2225 QLIST_FOREACH_SAFE(giommu
, &container
->giommu_list
, giommu_next
, tmp
) {
2226 memory_region_unregister_iommu_notifier(
2227 MEMORY_REGION(giommu
->iommu_mr
), &giommu
->n
);
2228 QLIST_REMOVE(giommu
, giommu_next
);
2232 QLIST_FOREACH_SAFE(hostwin
, &container
->hostwin_list
, hostwin_next
,
2234 QLIST_REMOVE(hostwin
, hostwin_next
);
2238 trace_vfio_disconnect_container(container
->fd
);
2239 close(container
->fd
);
2242 vfio_put_address_space(space
);
2246 VFIOGroup
*vfio_get_group(int groupid
, AddressSpace
*as
, Error
**errp
)
2250 struct vfio_group_status status
= { .argsz
= sizeof(status
) };
2252 QLIST_FOREACH(group
, &vfio_group_list
, next
) {
2253 if (group
->groupid
== groupid
) {
2254 /* Found it. Now is it already in the right context? */
2255 if (group
->container
->space
->as
== as
) {
2258 error_setg(errp
, "group %d used in multiple address spaces",
2265 group
= g_malloc0(sizeof(*group
));
2267 snprintf(path
, sizeof(path
), "/dev/vfio/%d", groupid
);
2268 group
->fd
= qemu_open_old(path
, O_RDWR
);
2269 if (group
->fd
< 0) {
2270 error_setg_errno(errp
, errno
, "failed to open %s", path
);
2271 goto free_group_exit
;
2274 if (ioctl(group
->fd
, VFIO_GROUP_GET_STATUS
, &status
)) {
2275 error_setg_errno(errp
, errno
, "failed to get group %d status", groupid
);
2279 if (!(status
.flags
& VFIO_GROUP_FLAGS_VIABLE
)) {
2280 error_setg(errp
, "group %d is not viable", groupid
);
2281 error_append_hint(errp
,
2282 "Please ensure all devices within the iommu_group "
2283 "are bound to their vfio bus driver.\n");
2287 group
->groupid
= groupid
;
2288 QLIST_INIT(&group
->device_list
);
2290 if (vfio_connect_container(group
, as
, errp
)) {
2291 error_prepend(errp
, "failed to setup container for group %d: ",
2296 if (QLIST_EMPTY(&vfio_group_list
)) {
2297 qemu_register_reset(vfio_reset_handler
, NULL
);
2300 QLIST_INSERT_HEAD(&vfio_group_list
, group
, next
);
2313 void vfio_put_group(VFIOGroup
*group
)
2315 if (!group
|| !QLIST_EMPTY(&group
->device_list
)) {
2319 if (!group
->ram_block_discard_allowed
) {
2320 vfio_ram_block_discard_disable(group
->container
, false);
2322 vfio_kvm_device_del_group(group
);
2323 vfio_disconnect_container(group
);
2324 QLIST_REMOVE(group
, next
);
2325 trace_vfio_put_group(group
->fd
);
2329 if (QLIST_EMPTY(&vfio_group_list
)) {
2330 qemu_unregister_reset(vfio_reset_handler
, NULL
);
2334 int vfio_get_device(VFIOGroup
*group
, const char *name
,
2335 VFIODevice
*vbasedev
, Error
**errp
)
2337 struct vfio_device_info dev_info
= { .argsz
= sizeof(dev_info
) };
2340 fd
= ioctl(group
->fd
, VFIO_GROUP_GET_DEVICE_FD
, name
);
2342 error_setg_errno(errp
, errno
, "error getting device from group %d",
2344 error_append_hint(errp
,
2345 "Verify all devices in group %d are bound to vfio-<bus> "
2346 "or pci-stub and not already in use\n", group
->groupid
);
2350 ret
= ioctl(fd
, VFIO_DEVICE_GET_INFO
, &dev_info
);
2352 error_setg_errno(errp
, errno
, "error getting device info");
2358 * Set discarding of RAM as not broken for this group if the driver knows
2359 * the device operates compatibly with discarding. Setting must be
2360 * consistent per group, but since compatibility is really only possible
2361 * with mdev currently, we expect singleton groups.
2363 if (vbasedev
->ram_block_discard_allowed
!=
2364 group
->ram_block_discard_allowed
) {
2365 if (!QLIST_EMPTY(&group
->device_list
)) {
2366 error_setg(errp
, "Inconsistent setting of support for discarding "
2367 "RAM (e.g., balloon) within group");
2372 if (!group
->ram_block_discard_allowed
) {
2373 group
->ram_block_discard_allowed
= true;
2374 vfio_ram_block_discard_disable(group
->container
, false);
2379 vbasedev
->group
= group
;
2380 QLIST_INSERT_HEAD(&group
->device_list
, vbasedev
, next
);
2382 vbasedev
->num_irqs
= dev_info
.num_irqs
;
2383 vbasedev
->num_regions
= dev_info
.num_regions
;
2384 vbasedev
->flags
= dev_info
.flags
;
2386 trace_vfio_get_device(name
, dev_info
.flags
, dev_info
.num_regions
,
2389 vbasedev
->reset_works
= !!(dev_info
.flags
& VFIO_DEVICE_FLAGS_RESET
);
2393 void vfio_put_base_device(VFIODevice
*vbasedev
)
2395 if (!vbasedev
->group
) {
2398 QLIST_REMOVE(vbasedev
, next
);
2399 vbasedev
->group
= NULL
;
2400 trace_vfio_put_base_device(vbasedev
->fd
);
2401 close(vbasedev
->fd
);
2404 int vfio_get_region_info(VFIODevice
*vbasedev
, int index
,
2405 struct vfio_region_info
**info
)
2407 size_t argsz
= sizeof(struct vfio_region_info
);
2409 *info
= g_malloc0(argsz
);
2411 (*info
)->index
= index
;
2413 (*info
)->argsz
= argsz
;
2415 if (ioctl(vbasedev
->fd
, VFIO_DEVICE_GET_REGION_INFO
, *info
)) {
2421 if ((*info
)->argsz
> argsz
) {
2422 argsz
= (*info
)->argsz
;
2423 *info
= g_realloc(*info
, argsz
);
2431 int vfio_get_dev_region_info(VFIODevice
*vbasedev
, uint32_t type
,
2432 uint32_t subtype
, struct vfio_region_info
**info
)
2436 for (i
= 0; i
< vbasedev
->num_regions
; i
++) {
2437 struct vfio_info_cap_header
*hdr
;
2438 struct vfio_region_info_cap_type
*cap_type
;
2440 if (vfio_get_region_info(vbasedev
, i
, info
)) {
2444 hdr
= vfio_get_region_info_cap(*info
, VFIO_REGION_INFO_CAP_TYPE
);
2450 cap_type
= container_of(hdr
, struct vfio_region_info_cap_type
, header
);
2452 trace_vfio_get_dev_region(vbasedev
->name
, i
,
2453 cap_type
->type
, cap_type
->subtype
);
2455 if (cap_type
->type
== type
&& cap_type
->subtype
== subtype
) {
2466 bool vfio_has_region_cap(VFIODevice
*vbasedev
, int region
, uint16_t cap_type
)
2468 struct vfio_region_info
*info
= NULL
;
2471 if (!vfio_get_region_info(vbasedev
, region
, &info
)) {
2472 if (vfio_get_region_info_cap(info
, cap_type
)) {
2482 * Interfaces for IBM EEH (Enhanced Error Handling)
2484 static bool vfio_eeh_container_ok(VFIOContainer
*container
)
2487 * As of 2016-03-04 (linux-4.5) the host kernel EEH/VFIO
2488 * implementation is broken if there are multiple groups in a
2489 * container. The hardware works in units of Partitionable
2490 * Endpoints (== IOMMU groups) and the EEH operations naively
2491 * iterate across all groups in the container, without any logic
2492 * to make sure the groups have their state synchronized. For
2493 * certain operations (ENABLE) that might be ok, until an error
2494 * occurs, but for others (GET_STATE) it's clearly broken.
2498 * XXX Once fixed kernels exist, test for them here
2501 if (QLIST_EMPTY(&container
->group_list
)) {
2505 if (QLIST_NEXT(QLIST_FIRST(&container
->group_list
), container_next
)) {
2512 static int vfio_eeh_container_op(VFIOContainer
*container
, uint32_t op
)
2514 struct vfio_eeh_pe_op pe_op
= {
2515 .argsz
= sizeof(pe_op
),
2520 if (!vfio_eeh_container_ok(container
)) {
2521 error_report("vfio/eeh: EEH_PE_OP 0x%x: "
2522 "kernel requires a container with exactly one group", op
);
2526 ret
= ioctl(container
->fd
, VFIO_EEH_PE_OP
, &pe_op
);
2528 error_report("vfio/eeh: EEH_PE_OP 0x%x failed: %m", op
);
2535 static VFIOContainer
*vfio_eeh_as_container(AddressSpace
*as
)
2537 VFIOAddressSpace
*space
= vfio_get_address_space(as
);
2538 VFIOContainer
*container
= NULL
;
2540 if (QLIST_EMPTY(&space
->containers
)) {
2541 /* No containers to act on */
2545 container
= QLIST_FIRST(&space
->containers
);
2547 if (QLIST_NEXT(container
, next
)) {
2548 /* We don't yet have logic to synchronize EEH state across
2549 * multiple containers */
2555 vfio_put_address_space(space
);
2559 bool vfio_eeh_as_ok(AddressSpace
*as
)
2561 VFIOContainer
*container
= vfio_eeh_as_container(as
);
2563 return (container
!= NULL
) && vfio_eeh_container_ok(container
);
2566 int vfio_eeh_as_op(AddressSpace
*as
, uint32_t op
)
2568 VFIOContainer
*container
= vfio_eeh_as_container(as
);
2573 return vfio_eeh_container_op(container
, op
);