[PATCH bpf-next v2 00/10] Local vmtest enhancement and RV64 enabled

[Pu Lehui]

Patch 1-3 fix some problem about bpf selftests. Patch 4 add local rootfs
image support for vmtest. Patch 5 enable cross-platform testing for
vmtest. Patch 6-10 enable vmtest on RV64.

We can now perform cross platform testing for riscv64 bpf using the
following command:

PLATFORM=riscv64 CROSS_COMPILE=riscv64-linux-gnu- \
  tools/testing/selftests/bpf/vmtest.sh \
  -l <path of local rootfs image> -- \
  ./test_progs -d \
      \"$(cat tools/testing/selftests/bpf/DENYLIST.riscv64 \
          | cut -d'#' -f1 \
          | sed -e 's/^[[:space:]]*//' \
                -e 's/[[:space:]]*$//' \
          | tr -s '\n' ',' \
      )\"

For better regression, we rely on commit [0] [1]. And since the work of riscv
ftrace to remove stop_machine atomic replacement is in progress, we also
need to revert commit [2] [3].

The test platform is x86_64 architecture, and the versions of relevant
components are as follows:
    QEMU: 8.2.0
    CLANG: 17.0.6 (align to BPF CI)
    ROOTFS: ubuntu noble (generated by [4])

Link: https://lore.kernel.org/all/20240831071520.1630360-1-pulehui@huaweicloud.com/ [0]
Link: https://lore.kernel.org/all/20240831041934.1629216-1-pulehui@huaweicloud.com/ [1]
Link: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3308172276db [2]
Link: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7caa9765465f [3]
Link: https://github.com/libbpf/ci/blob/main/rootfs/mkrootfs_debian.sh [4]

v2:
- Drop patch about relaxing Zbb insns restrictions.
- Add local rootfs image support
- Add description about running vmtest on RV64 
- Fix some problem about bpf selftests

v1: https://lore.kernel.org/all/20240328124916.293173-1-pulehui@huaweicloud.com/

Pu Lehui (10):
  selftests/bpf: Adapt OUTPUT appending logic to lower versions of Make
  selftests/bpf: Rename fallback in bpf_dctcp to avoid naming conflict
  selftests/bpf: Disable feature-llvm for vmtest
  selftests/bpf: Limit URLS parsing logic to actual scope in vmtest
  selftests/bpf: Support local rootfs image for vmtest
  selftests/bpf: Enable cross platform testing for vmtest
  selftests/bpf: Add config.riscv64
  selftests/bpf: Add DENYLIST.riscv64
  selftests/bpf: Add riscv64 configurations to local vmtest
  selftests/bpf: Add description for running vmtest on RV64

 tools/testing/selftests/bpf/DENYLIST.riscv64  |   3 +
 tools/testing/selftests/bpf/Makefile          |   8 ++
 tools/testing/selftests/bpf/README.rst        |  32 ++++-
 tools/testing/selftests/bpf/config.riscv64    |  84 ++++++++++++++
 .../selftests/bpf/prog_tests/bpf_tcp_ca.c     |   2 +-
 tools/testing/selftests/bpf/progs/bpf_dctcp.c |   8 +-
 tools/testing/selftests/bpf/vmtest.sh         | 109 ++++++++++++------
 7 files changed, 205 insertions(+), 41 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/DENYLIST.riscv64
 create mode 100644 tools/testing/selftests/bpf/config.riscv64

-- 
2.34.1