selftests/bpf: Consolidate VIRTIO/9P configs in config.vm file

Those configs are needed to be able to run VM somewhat consistently.
For instance, ATM, s390x is missing the `CONFIG_VIRTIO_CONSOLE` which
prevents s390x kernels built in CI to leverage qemu-guest-agent.

By moving them to `config,vm`, we should have selftest kernels which are
equal in term of VM functionalities when they include this file.

The set of config unabled were picked using

grep -h -E '(_9P|_VIRTIO)' config.x86_64 config | sort | uniq

added to `config.vm` and then
grep -vE '(_9P|_VIRTIO)' config.{x86_64,aarch64,s390x}

as a side-effect, some config may have disappeared to the aarch64 and
s390x kernels, but they should not be needed. CI will tell.

Signed-off-by: Manu Bretelle <chantr4@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20231031212717.4037892-1-chantr4@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

selftests/bpf: Fix s390x vmlinux path

After commit edd4a8667355 ("s390/boot: get rid of startup archive")
there is no more compressed/ subdirectory.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Link: https://lore.kernel.org/r/20230129190501.1624747-8-iii@linux.ibm.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

selftests/bpf: Update vmtests.sh to support aarch64

Add handling of aarch64 when setting QEMU options and provide the right
path to aarch64 kernel image.

Signed-off-by: Manu Bretelle <chantr4@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20221021210701.728135-4-chantr4@gmail.com

selftests/bpf: Fix vmtest.sh getopts optstring

Before, you could see the following errors:

$ ./vmtest.sh -j
./vmtest.sh: option requires an argument -- j
./vmtest.sh: line 357: OPTARG: unbound variable

$ ./vmtest.sh -z
./vmtest.sh: illegal option -- z
./vmtest.sh: line 357: OPTARG: unbound variable

Fix by adding ':' as first character of optstring. Reason is that getopts
requires ':' as the first character for OPTARG to be set in the `?` and `:`
error cases.

Note that the ':' as the first character of the optstring switches getopts
to silent mode. The desire to run in this mode seems to have been there all
along, as the script takes care of reporting errors.

Signed-off-by: Daniel Xu <dxu@dxuuu.xyz>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Daniel Müller <deso@posteo.net>
Link: https://lore.kernel.org/bpf/0f93b56198328b6b4da7b4cf4662d05c3edb5fd2.1660064925.git.dxu@dxuuu.xyz

selftests/bpf: Fix vmtest.sh -h to not require root

Set the exit trap only after argument parsing is done. This way argument
parse failure or `-h` will not require sudo.

Reasoning is that it's confusing that a help message would require root
access.

Signed-off-by: Daniel Xu <dxu@dxuuu.xyz>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Daniel Müller <deso@posteo.net>
Link: https://lore.kernel.org/bpf/6a802aa37758e5a7e6aa5de294634f5518005e2b.1660064925.git.dxu@dxuuu.xyz

selftests/bpf: Adjust vmtest.sh to use local kernel configuration

So far the vmtest.sh script, which can be used as a convenient way to
run bpf selftests, has obtained the kernel config safe to use for
testing from the libbpf/libbpf GitHub repository [0].

Given that we now have included this configuration into this very
repository, we can just consume it from here as well, eliminating the
necessity of remote accesses.

With this change we adjust the logic in the script to use the
configuration from below tools/testing/selftests/bpf/configs/ instead
of pulling it over the network.

[0] https://github.com/libbpf/libbpf

Signed-off-by: Daniel Müller <deso@posteo.net>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Mykola Lysenko <mykolal@fb.com>
Link: https://lore.kernel.org/bpf/20220727001156.3553701-4-deso@posteo.net

selftests/bpf: Fix vmtest.sh to launch smp vm.

Fix typo in vmtest.sh to make sure it launch proper vm with 8 cpus.

Signed-off-by: Yucong Sun <fallentree@fb.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20220217155212.2309672-1-fallentree@fb.com

selftests/bpf: Correct the INDEX address in vmtest.sh

Migration of vmtest to libbpf/ci will change the address
of INDEX in vmtest.sh, which will cause vmtest.sh to not
work due to the failure of rootfs fetching.

Signed-off-by: Pu Lehui <pulehui@huawei.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Tested-by: Lorenzo Fontana <lorenzo.fontana@elastic.co>
Link: https://lore.kernel.org/bpf/20211220050803.2670677-1-pulehui@huawei.com

selfetests/bpf: Adapt vmtest.sh to s390 libbpf CI changes

[1] added s390 support to libbpf CI and added an ${ARCH} prefix to a
number of paths and identifiers in libbpf GitHub repo, which vmtest.sh
relies upon. Update these and make use of the new s390 support.

[1] https://github.com/libbpf/libbpf/pull/204

Co-developed-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20211118115225.1349726-1-iii@linux.ibm.com

selfetests/bpf: Update vmtest.sh defaults

Increase memory to 4G, 8 SMP core with host cpu passthrough. This
make it run faster in parallel mode and more likely to succeed.

Signed-off-by: Yucong Sun <sunyucong@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20211025223345.2136168-2-fallentree@fb.com

selftests/bpf: Add an option for a debug shell in vmtest.sh

The newly introduced -s command line option starts an interactive shell.
If a command is specified, the shell is started after the command
finishes executing. It's useful to have a shell especially when
debugging failing tests or developing new tests.

Since the user may terminate the VM forcefully, an extra "sync" is added
after the execution of the command to persist any logs from the command
into the log file.

Signed-off-by: KP Singh <kpsingh@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210323014752.3198283-1-kpsingh@kernel.org

selftests/bpf: Propagate error code of the command to vmtest.sh

When vmtest.sh ran a command in a VM, it did not record or propagate the
error code of the command. This made the script less "script-able". The
script now saves the error code of the said command in a file in the VM,
copies the file back to the host and (when available) uses this error
code instead of its own.

Signed-off-by: KP Singh <kpsingh@google.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210225161947.1778590-1-kpsingh@kernel.org

bpf: Helper script for running BPF presubmit tests

The script runs the BPF selftests locally on the same kernel image
as they would run post submit in the BPF continuous integration
framework.

The goal of the script is to allow contributors to run selftests locally
in the same environment to check if their changes would end up breaking
the BPF CI and reduce the back-and-forth between the maintainers and the
developers.

Signed-off-by: KP Singh <kpsingh@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Tested-by: Jiri Olsa <jolsa@redhat.com>
Link: https://lore.kernel.org/bpf/20210204194544.3383814-2-kpsingh@kernel.org