linux-stable.git/tools/testing/selftests/liveupdate/init.c, branch master Linux kernel stable tree selftests/liveupdate: add end to end test infrastructure and scripts 2026-07-10T08:07:54+00:00 Pasha Tatashin pasha.tatashin@soleen.com 2026-06-26T09:15:36+00:00 89dd1421c554515e0f562ec67d976e6309f2710b Add the end to end testing infrastructure required to verify the liveupdate feature. This includes a custom init process, a test orchestration script, and a batch runner. The framework consists of: init.c: A lightweight init process that manages the kexec lifecycle. It mounts necessary filesystems, determines the current execution stage (1 or 2) via the kernel command line, and handles the kexec_file_load() sequence to transition between kernels. vmtest.sh: The primary KTAP-compliant test driver. It handles: - Kernel configuration merging and building. - Cross-compilation detection for x86_64 and arm64. - Generation of the initrd containing the test binary and init. - QEMU execution with automatic accelerator detection (KVM, HVF, or TCG). run-vmtests.sh: A wrapper that runs vmtest.sh for each LUO test across supported architectures, providing a summary of pass/fail/skip results. Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com> Co-developed-by: Jordan Richards <jordanrichards@google.com> Signed-off-by: Jordan Richards <jordanrichards@google.com> Co-developed-by: Mike Rapoport (Microsoft) <rppt@kernel.org> Acked-by: Pratyush Yadav <pratyush@kernel.org> Link: https://patch.msgid.link/20260626-luo-vmtest-v0-v4-1-e7d3111cd5b3@kernel.org Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org> 
Add the end to end testing infrastructure required to verify the
liveupdate feature. This includes a custom init process, a test
orchestration script, and a batch runner.

The framework consists of:

init.c:
A lightweight init process that manages the kexec lifecycle.
It mounts necessary filesystems, determines the current execution
stage (1 or 2) via the kernel command line, and handles the
kexec_file_load() sequence to transition between kernels.

vmtest.sh:
The primary KTAP-compliant test driver. It handles:
- Kernel configuration merging and building.
- Cross-compilation detection for x86_64 and arm64.
- Generation of the initrd containing the test binary and init.
- QEMU execution with automatic accelerator detection (KVM, HVF,
 or TCG).

run-vmtests.sh:
A wrapper that runs vmtest.sh for each LUO test across supported
architectures, providing a summary of pass/fail/skip results.

Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Co-developed-by: Jordan Richards <jordanrichards@google.com>
Signed-off-by: Jordan Richards <jordanrichards@google.com>
Co-developed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Acked-by: Pratyush Yadav <pratyush@kernel.org>
Link: https://patch.msgid.link/20260626-luo-vmtest-v0-v4-1-e7d3111cd5b3@kernel.org
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>