linux.git/include/linux/vfio.h, branch v7.1-rc4

vfio: unhide vdev->debug_root

2026-03-30T22:43:24+00:00

When debugfs is disabled, the hisilicon driver now fails to build:

drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c: In function 'hisi_acc_vfio_debug_init':
drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c:1671:62: error: 'struct vfio_device' has no member named 'debug_root'
 1671 |         vfio_dev_migration = debugfs_lookup("migration", vdev->debug_root);
      |                                                              ^~

The driver otherwise relies on dead-code elimination, but this reference
fails. The single struct member is not going to make much of a difference
for memory consumption, so just keep this visible unconditionally.

Signed-off-by: Arnd Bergmann 
Fixes: b398f91779b8 ("hisi_acc_vfio_pci: register debugfs for hisilicon migration driver")
Link: https://lore.kernel.org/r/20260327165521.3779707-1-arnd@kernel.org
Signed-off-by: Alex Williamson

vfio: Adapt drivers to use the core helper vfio_check_precopy_ioctl

2026-03-19T18:32:09+00:00

Introduce a core helper function for VFIO_MIG_GET_PRECOPY_INFO and adapt
all drivers to use it.

It centralizes the common code and ensures that output flags are cleared
on entry, in case user opts in to VFIO_DEVICE_FEATURE_MIG_PRECOPY_INFOv2.
This preventing any unintended echoing of userspace data back to
userspace.

Signed-off-by: Yishai Hadas 
Link: https://lore.kernel.org/r/20260317161753.18964-4-yishaih@nvidia.com
Signed-off-by: Alex Williamson

vfio: Add support for VFIO_DEVICE_FEATURE_MIG_PRECOPY_INFOv2

2026-03-19T18:32:08+00:00

Currently, existing VFIO_MIG_GET_PRECOPY_INFO implementations don't
assign info.flags before copy_to_user().

Because they copy the struct in from userspace first, this effectively
echoes userspace-provided flags back as output, preventing the field
from being used to report new reliable data from the drivers.

Add support for a new device feature named
VFIO_DEVICE_FEATURE_MIG_PRECOPY_INFOv2.

On SET, enables the v2 pre_copy_info behaviour, where the
vfio_precopy_info.flags is a valid output field.

Signed-off-by: Yishai Hadas 
Link: https://lore.kernel.org/r/20260317161753.18964-3-yishaih@nvidia.com
Signed-off-by: Alex Williamson

Merge tag 'vfio-v6.19-dma-buf-v9+' into v6.19/vfio/next

2025-11-21T04:20:00+00:00

[v9] vfio/pci: Allow MMIO regions to be exported through dma-buf

https://lore.kernel.org/all/20251120-dmabuf-vfio-v9-0-d7f71607f371@nvidia.com

Signed-off-by: Alex Williamson

vfio: Export vfio device get and put registration helpers

2025-11-20T19:02:32+00:00

These helpers are useful for managing additional references taken
on the device from other associated VFIO modules.

Original-patch-by: Jason Gunthorpe 
Signed-off-by: Vivek Kasireddy 
Reviewed-by: Kevin Tian 
Tested-by: Alex Mastro 
Tested-by: Nicolin Chen 
Signed-off-by: Leon Romanovsky 
Acked-by: Ankit Agrawal 
Link: https://lore.kernel.org/r/20251120-dmabuf-vfio-v9-7-d7f71607f371@nvidia.com
Signed-off-by: Alex Williamson

vfio: Remove the get_region_info op

2025-11-12T22:06:41+00:00

No driver uses it now, all are using get_region_info_caps().

Reviewed-by: Kevin Tian 
Signed-off-by: Jason Gunthorpe 
Link: https://lore.kernel.org/r/22-v2-2a9e24d62f1b+e10a-vfio_get_region_info_op_jgg@nvidia.com
Signed-off-by: Alex Williamson

vfio: Add get_region_info_caps op

2025-11-12T22:05:02+00:00

This op does the copy to/from user for the info and can return back
a cap chain through a vfio_info_cap * result.

Reviewed-by: Kevin Tian 
Reviewed-by: Pranjal Shrivastava 
Signed-off-by: Jason Gunthorpe 
Link: https://lore.kernel.org/r/15-v2-2a9e24d62f1b+e10a-vfio_get_region_info_op_jgg@nvidia.com
Signed-off-by: Alex Williamson

vfio: Provide a get_region_info op

2025-11-12T21:58:23+00:00

Instead of hooking the general ioctl op, have the core code directly
decode VFIO_DEVICE_GET_REGION_INFO and call an op just for it.

This is intended to allow mechanical changes to the drivers to pull their
VFIO_DEVICE_GET_REGION_INFO int oa function. Later patches will improve
the function signature to consolidate more code.

Reviewed-by: Kevin Tian 
Reviewed-by: Pranjal Shrivastava 
Signed-off-by: Jason Gunthorpe 
Link: https://lore.kernel.org/r/1-v2-2a9e24d62f1b+e10a-vfio_get_region_info_op_jgg@nvidia.com
Signed-off-by: Alex Williamson

vfio/pci: Do vf_token checks for VFIO_DEVICE_BIND_IOMMUFD

2025-08-05T21:41:14+00:00

This was missed during the initial implementation. The VFIO PCI encodes
the vf_token inside the device name when opening the device from the group
FD, something like:

  "0000:04:10.0 vf_token=bd8d9d2b-5a5f-4f5a-a211-f591514ba1f3"

This is used to control access to a VF unless there is co-ordination with
the owner of the PF.

Since we no longer have a device name in the cdev path, pass the token
directly through VFIO_DEVICE_BIND_IOMMUFD using an optional field
indicated by VFIO_DEVICE_BIND_FLAG_TOKEN.

Fixes: 5fcc26969a16 ("vfio: Add VFIO_DEVICE_BIND_IOMMUFD")
Tested-by: Shameer Kolothum 
Reviewed-by: Yi Liu 
Signed-off-by: Jason Gunthorpe 
Reviewed-by: Kevin Tian 
Link: https://lore.kernel.org/r/0-v3-bdd8716e85fe+3978a-vfio_token_jgg@nvidia.com
Signed-off-by: Alex Williamson

vfio-iommufd: Support pasid [at|de]tach for physical VFIO devices

2025-03-25T13:18:31+00:00

This adds pasid_at|de]tach_ioas ops for attaching hwpt to pasid of a
device and the helpers for it. For now, only vfio-pci supports pasid
attach/detach.

Link: https://patch.msgid.link/r/20250321180143.8468-3-yi.l.liu@intel.com
Signed-off-by: Kevin Tian 
Reviewed-by: Jason Gunthorpe 
Reviewed-by: Alex Williamson 
Tested-by: Nicolin Chen 
Signed-off-by: Yi Liu 
Signed-off-by: Jason Gunthorpe