kernel/linux.git/tools/testing/selftests/vfio, branch v7.2-rc2

vfio: selftests: Add luuid to libvfio.mk's list of libraries, not to the Makefile

2026-06-30T21:50:55+00:00

Link to the uuid library as part of libvfio.mk instead of as only linking it via VFIO selftests' Makefile, as the whole point of providing libvfio.mk is to allow linking the VFIO library functionality into KVM selftests, without KVM selftests having to know the gory details or duplicate code. Cc: Raghavendra Rao Ananta Cc: David Matlack Cc: Vipin Sharma Cc: Alex Williamson Fixes: e65f1bf8a2db ("vfio: selftests: Extend container/iommufd setup for passing vf_token") Signed-off-by: Sean Christopherson Reviewed-by: David Matlack Link: https://lore.kernel.org/r/20260630212805.474418-1-seanjc@google.com Signed-off-by: Alex Williamson

vfio: selftests: Ensure libvfio output dirs are always created

2026-06-12T16:25:44+00:00

Add an explicit dependency between the output object files and the output directories that need to be created to hold those files. This ensures that the output directories are always created. Creating the output directories at parse time (current behavior) doesn't support the scenario where someone does "make clean all". The directories will be created during parsing, deleted during "clean" and then not available for the "all" target. Use an order-only prerequisite for the output directories, rather than a normal prerequisite, to avoid unnecessary recompilations. Fixes: 19faf6fd969c ("vfio: selftests: Add a helper library for VFIO selftests") Reported-by: Sashiko Closes: https://lore.kernel.org/kvm/20260610010314.DB8861F00893@smtp.kernel.org/ Signed-off-by: David Matlack Link: https://lore.kernel.org/r/20260611213945.3714421-1-dmatlack@google.com Signed-off-by: Alex Williamson

vfio: selftests: Add tests to validate SR-IOV UAPI

2026-05-20T17:54:10+00:00

Add a selftest, vfio_pci_sriov_uapi_test.c, to validate the SR-IOV UAPI, including the following cases, iterating over all the IOMMU modes currently supported: - Setting correct/incorrect/NULL tokens during device init. - Close the PF device immediately after setting the token. - Change/override the PF's token after device init. Signed-off-by: Raghavendra Rao Ananta Reviewed-by: Vipin Sharma Reviewed-by: David Matlack Tested-by: David Matlack Link: https://lore.kernel.org/r/20260505212838.1698034-9-rananta@google.com Signed-off-by: Alex Williamson

vfio: selftests: Add helpers to alloc/free vfio_pci_device

2026-05-20T17:54:10+00:00

Add a helper, vfio_pci_device_alloc(), to allocate 'struct vfio_pci_device'. The subsequent test patch will utilize this to get the struct with very minimal initialization done. Internally, let vfio_pci_device_init() also make use of this function and later do the full initialization. Symmetrically, add a free variant, vfio_pci_device_free(), to be used in a similar fashion. No functional change intended. Signed-off-by: Raghavendra Rao Ananta Reviewed-by: David Matlack Reviewed-by: Vipin Sharma Tested-by: David Matlack Link: https://lore.kernel.org/r/20260505212838.1698034-8-rananta@google.com Signed-off-by: Alex Williamson

vfio: selftests: Add helper to set/override a vf_token

2026-05-20T17:54:10+00:00

Add a helper function, vfio_device_set_vf_token(), to set or override a vf_token. Not only at init, but a vf_token can also be set via the VFIO_DEVICE_FEATURE ioctl, by setting the VFIO_DEVICE_FEATURE_PCI_VF_TOKEN flag. Hence, add an API to utilize this functionality from the test code. The subsequent commit will use this to test the functionality of this method to set the vf_token. Signed-off-by: Raghavendra Rao Ananta Reviewed-by: David Matlack Reviewed-by: Vipin Sharma Tested-by: David Matlack Link: https://lore.kernel.org/r/20260505212838.1698034-7-rananta@google.com Signed-off-by: Alex Williamson

vfio: selftests: Expose more vfio_pci_device functions

2026-05-20T17:54:10+00:00

Refactor and make the functions called under device initialization public. A later patch adds a test that calls these functions to validate the UAPI of SR-IOV devices. Opportunistically, to test the success and failure cases of the UAPI, split the functions dealing with VFIO_GROUP_GET_DEVICE_FD and VFIO_DEVICE_BIND_IOMMUFD into a core function and another one that asserts the ioctl. The former will be used for testing the SR-IOV UAPI, hence only export these. Signed-off-by: Raghavendra Rao Ananta Reviewed-by: David Matlack Reviewed-by: Vipin Sharma Tested-by: David Matlack Link: https://lore.kernel.org/r/20260505212838.1698034-6-rananta@google.com Signed-off-by: Alex Williamson

vfio: selftests: Extend container/iommufd setup for passing vf_token

2026-05-20T17:54:10+00:00

A UUID is normally set as a vf_token to correspond the VFs with the PFs, if they are both bound by the vfio-pci driver. This is true for iommufd-based approach and container-based approach. The token can be set either during device creation (VFIO_GROUP_GET_DEVICE_FD) in container-based approach or during iommu bind (VFIO_DEVICE_BIND_IOMMUFD) in the iommu-fd case. Hence extend the functions, vfio_pci_iommufd_setup() and vfio_pci_container_setup(), to accept vf_token as an (optional) argument and handle the necessary setup. No functional changes are expected. Signed-off-by: Raghavendra Rao Ananta Reviewed-by: David Matlack Reviewed-by: Vipin Sharma Tested-by: David Matlack Link: https://lore.kernel.org/r/20260505212838.1698034-5-rananta@google.com Signed-off-by: Alex Williamson

vfio: selftests: Introduce a sysfs lib

2026-05-20T17:54:10+00:00

Introduce a sysfs library to handle the common reads/writes to the PCI sysfs files, for example, getting the total number of VFs supported by the device via /sys/bus/pci/devices/$BDF/sriov_totalvfs. The library will be used in the upcoming test patch to configure the VFs for a given PF device. Since readlink() is quite commonly used in the lib, introduce and use readlink_safe() to take care of potential buffer overrun errors and to safely terminate the buffer with '\0'. Opportunistically, move vfio_pci_get_group_from_dev() to this library as it falls under the same bucket. Rename it to sysfs_iommu_group_get() to align with other function names. Signed-off-by: Raghavendra Rao Ananta Reviewed-by: Vipin Sharma Reviewed-by: David Matlack Tested-by: David Matlack Link: https://lore.kernel.org/r/20260505212838.1698034-4-rananta@google.com Signed-off-by: Alex Williamson

vfio: selftests: Introduce snprintf_assert()

2026-05-20T17:54:10+00:00

Introduce snprintf_assert() to protect the users of snprintf() to fail if the requested operation was truncated due to buffer limits. VFIO tests and libraries, including a new sysfs library that will be introduced by an upcoming patch, rely quite heavily on snprintf()s to build PCI sysfs paths. Having a protection against this will be helpful to prevent false test failures. Signed-off-by: Raghavendra Rao Ananta Reviewed-by: David Matlack Reviewed-by: Vipin Sharma Tested-by: David Matlack Link: https://lore.kernel.org/r/20260505212838.1698034-3-rananta@google.com Signed-off-by: Alex Williamson

vfio: selftests: Add -Wall and -Werror to the Makefile

2026-05-20T17:54:10+00:00

Add the compiler flags, -Wall and -Werror, to catch all the build warnings and flag them as a build error, respectively. This is to ensure that no obvious programmer errors are introduced. We can add -Wno-* flags in the future to ignore specific warnings as necesasry. Signed-off-by: Raghavendra Rao Ananta Reviewed-by: David Matlack Reviewed-by: Vipin Sharma Tested-by: David Matlack Link: https://lore.kernel.org/r/20260505212838.1698034-2-rananta@google.com Signed-off-by: Alex Williamson