[PATCH v2 0/6] vfio: selftest: Add SR-IOV UAPI test

[Raghavendra Rao Ananta <rananta@google.com>]

Hello,

This series adds a vfio selftest, vfio_pci_sriov_uapi_test.c, to get some
coverage on SR-IOV UAPI handling. Specifically, it includes the
following cases that iterates over all the iommu modes:
 - 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.

The test takes care of creating/setting up the VF device, and hence, it
can be executed like any other test, simply by passing the PF's BDF to
run.sh. For example,

$ ./scripts/setup.sh 0000:16:00.1
$ ./scripts/run.sh ./vfio_pci_sriov_uapi_test

TAP version 13
1..45
Starting 45 tests from 15 test cases.
  RUN  vfio_pci_sriov_uapi_test.vfio_type1_iommu_same_uuid.init_token_match
    OK vfio_pci_sriov_uapi_test.vfio_type1_iommu_same_uuid.init_token_match
ok 1 vfio_pci_sriov_uapi_test.vfio_type1_iommu_same_uuid.init_token_match
  RUN vfio_pci_sriov_uapi_test.vfio_type1_iommu_same_uuid.pf_early_close
   OK vfio_pci_sriov_uapi_test.vfio_type1_iommu_same_uuid.pf_early_close
ok 2 vfio_pci_sriov_uapi_test.vfio_type1_iommu_same_uuid.pf_early_close
  RUN vfio_pci_sriov_uapi_test.vfio_type1_iommu_same_uuid.override_token
   OK vfio_pci_sriov_uapi_test.vfio_type1_iommu_same_uuid.override_token
[...]
  RUN vfio_pci_sriov_uapi_test.iommufd_null_uuid.override_token ...
   OK vfio_pci_sriov_uapi_test.iommufd_null_uuid.override_token
ok 45 vfio_pci_sriov_uapi_test.iommufd_null_uuid.override_token
PASSED: 45 / 45 tests passed.

Thank you.
Raghavendra

v2: Suggestions by David Matlack (thank you)
 - Introduce snprintf_assert() to check against content trucation.
 - Introduce a new sysfs library to handle all the common vfio/pci sysfs
   operations.
 - Rename vfio_pci_container_get_device_fd() to
   vfio_pci_group_get_device_fd().
 - Use a fixed size 'arg' array instead of dynamic allocation in
   __vfio_pci_group_get_device_fd().
 - Exclude vfio_pci_device_init() to accept the 'vf_token' arg.
 - Move the vfio_pci_sriov_uapi_test.c global variable to the FIXTURE()
   struct or as TEST_F() local variables.
 - test_vfio_pci_container_setup() returns 'int' to indicate status.
 - Skip the test if nr_vfs != 0.
 - Explicitly set "sriov_drivers_autoprobe" for the PF.
 - Make sure to bind the VF device to the "vfio-pci" driver.
 - Cleanup the things done by FIXTURE_SETUP() in FIXTURE_TEARDOWN().

v1: https://lore.kernel.org/all/20251104003536.3601931-1-rananta@google.com/

Raghavendra Rao Ananta (6):
  vfio: selftests: Introduce snprintf_assert()
  vfio: selftests: Introduce a sysfs lib
  vfio: selftests: Extend container/iommufd setup for passing vf_token
  vfio: selftests: Export more vfio_pci functions
  vfio: selftests: Add helper to set/override a vf_token
  vfio: selftests: Add tests to validate SR-IOV UAPI

 tools/testing/selftests/vfio/Makefile         |   1 +
 .../selftests/vfio/lib/include/libvfio.h      |   1 +
 .../vfio/lib/include/libvfio/assert.h         |   5 +
 .../vfio/lib/include/libvfio/sysfs.h          |  16 ++
 .../lib/include/libvfio/vfio_pci_device.h     |   9 +
 tools/testing/selftests/vfio/lib/libvfio.mk   |   5 +-
 tools/testing/selftests/vfio/lib/sysfs.c      | 151 ++++++++++++
 .../selftests/vfio/lib/vfio_pci_device.c      | 135 ++++++++---
 .../selftests/vfio/vfio_dma_mapping_test.c    |   6 +-
 .../selftests/vfio/vfio_pci_device_test.c     |  21 +-
 .../selftests/vfio/vfio_pci_sriov_uapi_test.c | 215 ++++++++++++++++++
 11 files changed, 515 insertions(+), 50 deletions(-)
 create mode 100644 tools/testing/selftests/vfio/lib/include/libvfio/sysfs.h
 create mode 100644 tools/testing/selftests/vfio/lib/sysfs.c
 create mode 100644 tools/testing/selftests/vfio/vfio_pci_sriov_uapi_test.c


base-commit: d721f52e31553a848e0e9947ca15a49c5674aef3
--
2.52.0.239.gd5f0c6e74e-goog