Closed chantra closed 6 months ago
I have tested this again and it works as expected from my manual tests.
Currently using a fork of danobi/vmtest due to https://github.com/danobi/vmtest/issues/40 which is affecting s390x.
From the look of it, using vmtest instead of our old mechanism saves us 170s (p90) when testing s390x as we do not need to prepare the chroot anymore.
The first commit message explains the rationale. Copied below.
Note that this PR only adds a new action and is essentially a no-op until kernel-patches/vmtest is modified.
Test done:
Pointed kernel-patches/vmtest to use chantra/libbpf-ci/run-vmtest@vmtest (kernel-patches/vmtest#243): https://github.com/kernel-patches/vmtest/actions/runs/7506022729/job/20436527154?pr=243
To validate Meta's veristat, hacked up a PR on kernel-patches/bpf#6245:
https://github.com/kernel-patches/bpf/actions/runs/7496945955/job/20409897434?pr=6245
First commit message:
Add a new action to mimick what used to be done by
run-qemu
.This action is roughly a
cp run-qemu run-vmtest
in term of functionalities. See end of this commit message for a rationale of this change.Just like
run-qemu
assumes the presence of a rootfs which is provisioned with a copy of the script fromci/vmtest/run_selftests.sh
,run-vmtest
assumes the presence ofci/vmtest/vmtest_selftests.sh
and will run it.vmtest_selftests.sh
functionally does the same asrun_selftests.sh
with a few adjustments to make it work in thevmtest
world` and leave in the "callee" repository, not libbpf-ci.print_test_summary.py
was copied over unchanged. Later diff will remove the version fromrun-qemu
and point to this one instead.action.yml
needs to install a few tools that were historically baked in the rootfs. A bunch of parameters are now historical.... this diff does not attempt to remove them yet. This will be address later too and will probably change as libbpf/libbpf use case is merged in.run.sh
gets rid of the logic to create theqemu
one-liner as well as the downloading of files from within the rootfs, and adjust it to using files on disk that were left over by the test run.Full end-to-end testing will be done through a PR in https://github.com/kernel-patches/vmtest
== Main functional difference between
run-qemu
andrun-vmtest
.run-qemu
runs the kernel inside a rootfs which is isolated from the host FS, meaning that we potentially have a host in which we build the kernel/selftests which is different than the host we run in. Causing depedency issues, see https://github.com/libbpf/ci/pull/83 and to some extends https://github.com/libbpf/ci/issues/103 . We could work around this with statically built binaries, but because of the different rootfs, we end up having to maintain rootfs and doing a dance of copying files in and out of the rootfs (through the prepare-rootfs action), which is slow, pulls a fair amount of bytes through the network...run-vmtest
on the other hand does mount the host rootfs (read-only) and shares the current directory (read-write) under /mnt/vmtest. This resolves 2 things for us.On top of this,
vmtest
also handles the peculiarities of crafting the right qemu one-liner.