kernel/git/next/linux-next.git/drivers/vfio/iommufd.c, branch master

vfio: Enable cdev noiommu mode under iommufd

2026-07-14T15:05:01+00:00

Now that devices under noiommu mode can bind with IOMMUFD and perform IOAS operations, lift restrictions on cdev from VFIO side. Use cases are documented in Documentation/driver-api/vfio.rst Link: https://patch.msgid.link/r/fdac3395ecc52f87b722b54a055ced66733dc48f.1783360051.git.jacob.pan@linux.microsoft.com Reviewed-by: Kevin Tian Reviewed-by: Pranjal Shrivastava Reviewed-by: Yi Liu Reviewed-by: Alex Williamson Signed-off-by: Jacob Pan Fixes: 2c6cf6ab1564 ("iommufd: Allow binding to a noiommu device") Signed-off-by: Jason Gunthorpe

vfio: Fix unbalanced vfio_df_close call in no-iommu mode

2025-07-11T20:43:37+00:00

For devices with no-iommu enabled in IOMMUFD VFIO compat mode, the group open path skips vfio_df_open(), leaving open_count at 0. This causes a warning in vfio_assert_device_open(device) when vfio_df_close() is called during group close. The correct behavior is to skip only the IOMMUFD bind in the device open path for no-iommu devices. Commit 6086efe73498 omitted vfio_df_open(), which was too broad. This patch restores the previous behavior, ensuring the vfio_df_open is called in the group open path. Fixes: 6086efe73498 ("vfio-iommufd: Move noiommu compat validation out of vfio_iommufd_bind()") Suggested-by: Alex Williamson Suggested-by: Jason Gunthorpe Signed-off-by: Jacob Pan Reviewed-by: Jason Gunthorpe Link: https://lore.kernel.org/r/20250618234618.1910456-1-jacob.pan@linux.microsoft.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

iommufd: Support pasid attach/replace

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

This extends the below APIs to support PASID. Device drivers to manage pasid attach/replace/detach. int iommufd_device_attach(struct iommufd_device *idev, ioasid_t pasid, u32 *pt_id); int iommufd_device_replace(struct iommufd_device *idev, ioasid_t pasid, u32 *pt_id); void iommufd_device_detach(struct iommufd_device *idev, ioasid_t pasid); The pasid operations share underlying attach/replace/detach infrastructure with the device operations, but still have some different implications: - no reserved region per pasid otherwise SVA architecture is already broken (CPU address space doesn't count device reserved regions); - accordingly no sw_msi trick; Cache coherency enforcement is still applied to pasid operations since it is about memory accesses post page table walking (no matter the walk is per RID or per PASID). Link: https://patch.msgid.link/r/20250321171940.7213-12-yi.l.liu@intel.com Reviewed-by: Jason Gunthorpe Signed-off-by: Kevin Tian Reviewed-by: Nicolin Chen Signed-off-by: Yi Liu Tested-by: Nicolin Chen Signed-off-by: Jason Gunthorpe

module: Convert symbol namespace to string literal

2024-12-02T19:34:44+00:00

Clean up the existing export namespace code along the same lines of commit 33def8498fdd ("treewide: Convert macro and uses of __section(foo) to __section("foo")") and for the same reason, it is not desired for the namespace argument to be a macro expansion itself. Scripted using git grep -l -e MODULE_IMPORT_NS -e EXPORT_SYMBOL_NS | while read file; do awk -i inplace ' /^#define EXPORT_SYMBOL_NS/ { gsub(/__stringify$ns$/, "ns"); print; next; } /^#define MODULE_IMPORT_NS/ { gsub(/__stringify$ns$/, "ns"); print; next; } /MODULE_IMPORT_NS/ { $0 = gensub(/MODULE_IMPORT_NS$([^)]*)$/, "MODULE_IMPORT_NS(\"\\1\")", "g"); } /EXPORT_SYMBOL_NS/ { if ($0 ~ /(EXPORT_SYMBOL_NS[^(]*)$([^,]+),/) { if ($0 !~ /(EXPORT_SYMBOL_NS[^(]*)\(([^,]+), ([^)]+)$/ && $0 !~ /(EXPORT_SYMBOL_NS[^(]*)/ && $0 !~ /^my/) { getline line; gsub(/[[:space:]]*\\$/, ""); gsub(/[[:space:]]/, "", line); $0 = $0 " " line; } $0 = gensub(/(EXPORT_SYMBOL_NS[^(]*)$([^,]+), ([^)]+)$/, "\\1(\\2, \"\\3\")", "g"); } } { print }' $file; done Requested-by: Masahiro Yamada Signed-off-by: Peter Zijlstra (Intel) Link: https://mail.google.com/mail/u/2/#inbox/FMfcgzQXKWgMmjdFwwdsfgxzKpVHWPlc Acked-by: Greg KH Signed-off-by: Linus Torvalds

vfio: Support IO page table replacement

2023-07-28T16:31:24+00:00

Now both the physical path and the emulated path can support an IO page table replacement. Call iommufd_device_replace/iommufd_access_replace(), when vdev->iommufd_attached is true. Also update the VFIO_DEVICE_ATTACH_IOMMUFD_PT kdoc in the uAPI header. Link: https://lore.kernel.org/r/b5f01956ff161f76aa52c95b0fa1ad6eaca95c4a.1690523699.git.nicolinc@nvidia.com Reviewed-by: Kevin Tian Reviewed-by: Jason Gunthorpe Reviewed-by: Alex Williamson Signed-off-by: Nicolin Chen Signed-off-by: Jason Gunthorpe

vfio-iommufd: Add detach_ioas support for emulated VFIO devices

2023-07-25T16:19:18+00:00

This prepares for adding DETACH ioctl for emulated VFIO devices. Reviewed-by: Kevin Tian Reviewed-by: Jason Gunthorpe Tested-by: Terrence Xu Tested-by: Nicolin Chen Tested-by: Matthew Rosato Tested-by: Yanting Jiang Tested-by: Shameer Kolothum Tested-by: Zhenzhong Duan Signed-off-by: Yi Liu Link: https://lore.kernel.org/r/20230718135551.6592-16-yi.l.liu@intel.com Signed-off-by: Alex Williamson

vfio-iommufd: Add detach_ioas support for physical VFIO devices

2023-07-25T16:19:12+00:00

This prepares for adding DETACH ioctl for physical VFIO devices. Reviewed-by: Kevin Tian Reviewed-by: Jason Gunthorpe Tested-by: Terrence Xu Tested-by: Nicolin Chen Tested-by: Matthew Rosato Tested-by: Yanting Jiang Tested-by: Shameer Kolothum Tested-by: Zhenzhong Duan Signed-off-by: Yi Liu Link: https://lore.kernel.org/r/20230718135551.6592-14-yi.l.liu@intel.com Signed-off-by: Alex Williamson

vfio: Record devid in vfio_device_file

2023-07-25T16:19:08+00:00

.bind_iommufd() will generate an ID to represent this bond, which is needed by userspace for further usage. Store devid in vfio_device_file to avoid passing the pointer in multiple places. Reviewed-by: Kevin Tian Reviewed-by: Jason Gunthorpe Tested-by: Terrence Xu Tested-by: Nicolin Chen Tested-by: Matthew Rosato Tested-by: Yanting Jiang Tested-by: Shameer Kolothum Tested-by: Zhenzhong Duan Signed-off-by: Yi Liu Link: https://lore.kernel.org/r/20230718135551.6592-13-yi.l.liu@intel.com Signed-off-by: Alex Williamson

vfio-iommufd: Split bind/attach into two steps

2023-07-25T16:19:04+00:00

This aligns the bind/attach logic with the coming vfio device cdev support. Reviewed-by: Kevin Tian Reviewed-by: Jason Gunthorpe Tested-by: Terrence Xu Tested-by: Nicolin Chen Tested-by: Matthew Rosato Tested-by: Yanting Jiang Tested-by: Shameer Kolothum Tested-by: Zhenzhong Duan Signed-off-by: Yi Liu Link: https://lore.kernel.org/r/20230718135551.6592-12-yi.l.liu@intel.com Signed-off-by: Alex Williamson