Linux-kselftest-mirror March 2025

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[PATCH v2 00/16] selftests: vDSO: parse_vdso: Make compatible with nolibc

by Thomas Weißschuh

For testing the functionality of the vDSO, it is necessary to build userspace programs for multiple different architectures. It is additional work to acquire matching userspace cross-compilers with full C libraries and then building root images out of those. The kernel tree already contains nolibc, a small, header-only C library. By using it, it is possible to build userspace programs without any additional dependencies. For example the kernel.org crosstools or multi-target clang can be used to build test programs for a multitude of architectures. While nolibc is very limited, it is enough for many selftests. With some minor adjustments it is possible to make parse_vdso.c compatible with nolibc. As an example, vdso_standalone_test_x86 is now built from the same C code as the regular vdso_test_gettimeofday, while still being completely standalone. Also drop the dependency of parse_vdso.c on the elf.h header from libc and only use the one from the kernel's UAPI. While this series is useful on its own now, it will also integrate with the kunit UAPI framework currently under development: https://lore.kernel.org/lkml/20250217-kunit-kselftests-v1-0-42b4524c3b0a@li… Signed-off-by: Thomas Weißschuh <thomas.weissschuh(a)linutronix.de> --- Changes in v2: - Provide a limits.h header in nolibc - Pick up Reviewed-by tags from Kees - Link to v1: https://lore.kernel.org/r/20250203-parse_vdso-nolibc-v1-0-9cb6268d77be@linu… --- Thomas Weißschuh (16): MAINTAINERS: Add vDSO selftests elf, uapi: Add definition for STN_UNDEF elf, uapi: Add definition for DT_GNU_HASH elf, uapi: Add definitions for VER_FLG_BASE and VER_FLG_WEAK elf, uapi: Add type ElfXX_Versym elf, uapi: Add types ElfXX_Verdef and ElfXX_Veraux tools/include: Add uapi/linux/elf.h selftests: Add headers target tools/nolibc: add limits.h shim header selftests: vDSO: vdso_standalone_test_x86: Use vdso_init_form_sysinfo_ehdr selftests: vDSO: parse_vdso: Drop vdso_init_from_auxv() selftests: vDSO: parse_vdso: Use UAPI headers instead of libc headers selftests: vDSO: parse_vdso: Test __SIZEOF_LONG__ instead of ULONG_MAX selftests: vDSO: vdso_test_gettimeofday: Clean up includes selftests: vDSO: vdso_test_gettimeofday: Make compatible with nolibc selftests: vDSO: vdso_standalone_test_x86: Switch to nolibc MAINTAINERS | 1 + include/uapi/linux/elf.h | 38 ++ tools/include/nolibc/Makefile | 1 + tools/include/nolibc/limits.h | 7 + tools/include/uapi/linux/elf.h | 524 +++++++++++++++++++++ tools/testing/selftests/lib.mk | 5 +- tools/testing/selftests/vDSO/Makefile | 11 +- tools/testing/selftests/vDSO/parse_vdso.c | 19 +- tools/testing/selftests/vDSO/parse_vdso.h | 1 - .../selftests/vDSO/vdso_standalone_test_x86.c | 143 +----- .../selftests/vDSO/vdso_test_gettimeofday.c | 4 +- 11 files changed, 590 insertions(+), 164 deletions(-) --- base-commit: 2014c95afecee3e76ca4a56956a936e23283f05b change-id: 20241017-parse_vdso-nolibc-e069baa7ff48 Best regards, -- Thomas Weißschuh <thomas.weissschuh(a)linutronix.de>

5 days, 2 hours

[PATCH v8 00/14] iommufd: Add vIOMMU infrastructure (Part-3: vEVENTQ)

by Nicolin Chen

As the vIOMMU infrastructure series part-3, this introduces a new vEVENTQ object. The existing FAULT object provides a nice notification pathway to the user space with a queue already, so let vEVENTQ reuse that. Mimicing the HWPT structure, add a common EVENTQ structure to support its derivatives: IOMMUFD_OBJ_FAULT (existing) and IOMMUFD_OBJ_VEVENTQ (new). An IOMMUFD_CMD_VEVENTQ_ALLOC is introduced to allocate vEVENTQ object for vIOMMUs. One vIOMMU can have multiple vEVENTQs in different types but can not support multiple vEVENTQs in the same type. The forwarding part is fairly simple but might need to replace a physical device ID with a virtual device ID in a driver-level event data structure. So, this also adds some helpers for drivers to use. As usual, this series comes with the selftest coverage for this new ioctl and with a real world use case in the ARM SMMUv3 driver. This is on Github: https://github.com/nicolinc/iommufd/commits/iommufd_veventq-v8 Paring QEMU branch for testing: https://github.com/nicolinc/qemu/commits/wip/for_iommufd_veventq-v8 Changelog v8 * Add Reviewed-by from Jason and Pranjal * Fix errno returned in arm_smmu_handle_event() * Validate domain->type outside of arm_smmu_attach_prepare_vmaster() * Drop unnecessary vmaster comparison in arm_smmu_attach_commit_vmaster() v7 https://lore.kernel.org/all/cover.1740238876.git.nicolinc@nvidia.com/ * Rebase on Jason's for-next tree for latest fault.c * Add Reviewed-by * Update commit logs * Add __reserved field sanity * Skip kfree() on the static header * Replace "bool on_list" with list_is_last() * Use u32 for flags in iommufd_vevent_header * Drop casting in iommufd_viommu_get_vdev_id() * Update the bounding logic to veventq->sequence * Add missing cpu_to_le64() around STRTAB_STE_1_MEV * Reuse veventq->common.lock to fence sequence and num_events * Rename overflow to lost_events and log it in upon kmalloc failure * Correct the error handling part in iommufd_veventq_deliver_fetch() * Add an arm_smmu_clear_vmaster() to simplify identity/blocked domain attach ops * Add additional four event records to forward to user space VM, and update the uAPI doc * Reuse the existing smmu->streams_mutex lock to fence master->vmaster pointer, instead of adding a new rwsem v6 https://lore.kernel.org/all/cover.1737754129.git.nicolinc@nvidia.com/ * Drop supports_veventq viommu op * Split bug/cosmetics fixes out of the series * Drop the blocking mutex around copy_to_user() * Add veventq_depth in uAPI to limit vEVENTQ size * Revise the documentation for a clear description * Fix sparse warnings in arm_vmaster_report_event() * Rework iommufd_viommu_get_vdev_id() to return -ENOENT v.s. 0 * Allow Abort/Bypass STEs to allocate vEVENTQ and set STE.MEV for DoS mitigations v5 https://lore.kernel.org/all/cover.1736237481.git.nicolinc@nvidia.com/ * Add Reviewed-by from Baolu * Reorder the OBJ list as well * Fix alphabetical order after renaming in v4 * Add supports_veventq viommu op for vEVENTQ type validation v4 https://lore.kernel.org/all/cover.1735933254.git.nicolinc@nvidia.com/ * Rename "vIRQ" to "vEVENTQ" * Use flexible array in struct iommufd_vevent * Add the new ioctl command to union ucmd_buffer * Fix the alphabetical order in union ucmd_buffer too * Rename _TYPE_NONE to _TYPE_DEFAULT aligning with vIOMMU naming v3 https://lore.kernel.org/all/cover.1734477608.git.nicolinc@nvidia.com/ * Rebase on Will's for-joerg/arm-smmu/updates for arm_smmu_event series * Add "Reviewed-by" lines from Kevin * Fix typos in comments, kdocs, and jump tags * Add a patch to sort struct iommufd_ioctl_op * Update iommufd's userpsace-api documentation * Update uAPI kdoc to quote SMMUv3 offical spec * Drop the unused workqueue in struct iommufd_virq * Drop might_sleep() in iommufd_viommu_report_irq() helper * Add missing "break" in iommufd_viommu_get_vdev_id() helper * Shrink the scope of the vmaster's read lock in SMMUv3 driver * Pass in two arguments to iommufd_eventq_virq_handler() helper * Move "!ops || !ops->read" validation into iommufd_eventq_init() * Move "fault->ictx = ictx" closer to iommufd_ctx_get(fault->ictx) * Update commit message for arm_smmu_attach_prepare/commit_vmaster() * Keep "iommufd_fault" as-is and rename "iommufd_eventq_virq" to just "iommufd_virq" v2 https://lore.kernel.org/all/cover.1733263737.git.nicolinc@nvidia.com/ * Rebase on v6.13-rc1 * Add IOPF and vIRQ in iommufd.rst (userspace-api) * Add a proper locking in iommufd_event_virq_destroy * Add iommufd_event_virq_abort with a lockdep_assert_held * Rename "EVENT_*" to "EVENTQ_*" to describe the objects better * Reorganize flows in iommufd_eventq_virq_alloc for abort() to work * Adde struct arm_smmu_vmaster to store vSID upon attaching to a nested domain, calling a newly added iommufd_viommu_get_vdev_id helper * Adde an arm_vmaster_report_event helper in arm-smmu-v3-iommufd file to simplify the routine in arm_smmu_handle_evt() of the main driver v1 https://lore.kernel.org/all/cover.1724777091.git.nicolinc@nvidia.com/ Thanks! Nicolin Nicolin Chen (14): iommufd/fault: Move two fault functions out of the header iommufd/fault: Add an iommufd_fault_init() helper iommufd: Abstract an iommufd_eventq from iommufd_fault iommufd: Rename fault.c to eventq.c iommufd: Add IOMMUFD_OBJ_VEVENTQ and IOMMUFD_CMD_VEVENTQ_ALLOC iommufd/viommu: Add iommufd_viommu_get_vdev_id helper iommufd/viommu: Add iommufd_viommu_report_event helper iommufd/selftest: Require vdev_id when attaching to a nested domain iommufd/selftest: Add IOMMU_TEST_OP_TRIGGER_VEVENT for vEVENTQ coverage iommufd/selftest: Add IOMMU_VEVENTQ_ALLOC test coverage Documentation: userspace-api: iommufd: Update FAULT and VEVENTQ iommu/arm-smmu-v3: Introduce struct arm_smmu_vmaster iommu/arm-smmu-v3: Report events that belong to devices attached to vIOMMU iommu/arm-smmu-v3: Set MEV bit in nested STE for DoS mitigations drivers/iommu/iommufd/Makefile | 2 +- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 36 ++ drivers/iommu/iommufd/iommufd_private.h | 135 +++- drivers/iommu/iommufd/iommufd_test.h | 10 + include/linux/iommufd.h | 23 + include/uapi/linux/iommufd.h | 105 +++ tools/testing/selftests/iommu/iommufd_utils.h | 115 ++++ .../arm/arm-smmu-v3/arm-smmu-v3-iommufd.c | 64 ++ drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 82 ++- drivers/iommu/iommufd/driver.c | 72 +++ drivers/iommu/iommufd/eventq.c | 597 ++++++++++++++++++ drivers/iommu/iommufd/fault.c | 342 ---------- drivers/iommu/iommufd/hw_pagetable.c | 6 +- drivers/iommu/iommufd/main.c | 7 + drivers/iommu/iommufd/selftest.c | 54 ++ drivers/iommu/iommufd/viommu.c | 2 + tools/testing/selftests/iommu/iommufd.c | 36 ++ .../selftests/iommu/iommufd_fail_nth.c | 7 + Documentation/userspace-api/iommufd.rst | 17 + 19 files changed, 1304 insertions(+), 408 deletions(-) create mode 100644 drivers/iommu/iommufd/eventq.c delete mode 100644 drivers/iommu/iommufd/fault.c base-commit: 598749522d4254afb33b8a6c1bea614a95896868 -- 2.43.0

5 days, 9 hours

[PATCH V3 0/3] selftests: add ublk selftests

by Ming Lei

Hello Jens, This patchset adds ublk kernel selftests, which is very handy for developer for verifying kernel change, especially ublk heavily depends on io_uring subsystem. Also it provides template for target implementation. Please consider it for v6.15. The 1st patch adds one ublk utility and one entry test. The 2nd patch adds test over file backed ublk. The 3rd patch adds test for ublk zero copy. How to run: - make install - make headers_install INSTALL_HDR_PATH=/usr # in case UAPI is changed - reboot - make -C tools/testing/selftests TARGETS=ublk run_test Thanks, V3: - re-organize code, and move target code into standalone source file - fix one error handling bug - add licence tag - add dma limit for zero copy file backed target - kill checkpatch ERROR V2: - fix one sqe allocation bug, so ublk zero copy with io_link can pass - dump log in case of error - add one more test for mkfs/mount on zero copy Ming Lei (3): selftests: ublk: add kernel selftests for ublk selftests: ublk: add file backed ublk selftests: ublk: add ublk zero copy test MAINTAINERS | 1 + tools/testing/selftests/Makefile | 1 + tools/testing/selftests/ublk/.gitignore | 3 + tools/testing/selftests/ublk/Makefile | 16 + tools/testing/selftests/ublk/config | 1 + tools/testing/selftests/ublk/file_backed.c | 220 ++++ tools/testing/selftests/ublk/kublk.c | 1110 ++++++++++++++++++ tools/testing/selftests/ublk/kublk.h | 326 +++++ tools/testing/selftests/ublk/null.c | 38 + tools/testing/selftests/ublk/test_common.sh | 113 ++ tools/testing/selftests/ublk/test_loop_01.sh | 31 + tools/testing/selftests/ublk/test_loop_02.sh | 22 + tools/testing/selftests/ublk/test_loop_03.sh | 33 + tools/testing/selftests/ublk/test_loop_04.sh | 22 + tools/testing/selftests/ublk/test_null_01.sh | 19 + 15 files changed, 1956 insertions(+) create mode 100644 tools/testing/selftests/ublk/.gitignore create mode 100644 tools/testing/selftests/ublk/Makefile create mode 100644 tools/testing/selftests/ublk/config create mode 100644 tools/testing/selftests/ublk/file_backed.c create mode 100644 tools/testing/selftests/ublk/kublk.c create mode 100644 tools/testing/selftests/ublk/kublk.h create mode 100644 tools/testing/selftests/ublk/null.c create mode 100755 tools/testing/selftests/ublk/test_common.sh create mode 100755 tools/testing/selftests/ublk/test_loop_01.sh create mode 100755 tools/testing/selftests/ublk/test_loop_02.sh create mode 100755 tools/testing/selftests/ublk/test_loop_03.sh create mode 100755 tools/testing/selftests/ublk/test_loop_04.sh create mode 100755 tools/testing/selftests/ublk/test_null_01.sh -- 2.47.0

5 days, 11 hours

[PATCH bpf-next v1 0/3] Optimize bpf selftest to increase CI success rate

by Jiayuan Chen

1. Optimized some static bound port selftests to avoid port occupation when running test_progs -j. 2. Optimized the retry logic for test_maps. Some Failed CI: https://github.com/kernel-patches/bpf/actions/runs/13275542359/job/37064974… https://github.com/kernel-patches/bpf/actions/runs/13549227497/job/37868926… https://github.com/kernel-patches/bpf/actions/runs/13548089029/job/37865812… https://github.com/kernel-patches/bpf/actions/runs/13553536268/job/37883329… (Perhaps it's due to the large number of pull requests requiring CI runs?) Jiayuan Chen (3): selftests/bpf: Allow auto port binding for cgroup connect selftests/bpf: Allow auto port binding for bpf nf selftests/bpf: Fixes for test_maps test tools/testing/selftests/bpf/prog_tests/bpf_nf.c | 9 ++++++--- .../testing/selftests/bpf/prog_tests/cgroup_v1v2.c | 13 +++++++++---- .../testing/selftests/bpf/progs/connect4_dropper.c | 4 +++- tools/testing/selftests/bpf/test_maps.c | 9 +++++---- 4 files changed, 23 insertions(+), 12 deletions(-) -- 2.47.1

5 days, 12 hours

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