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Kernel Patches Daemon
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adding ci files
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‎.github/actions/vmtest/action.yml‎

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name: 'vmtest'
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description: 'Build + run vmtest'
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inputs:
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arch:
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description: 'what arch to test'
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required: true
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default: 'x86_64'
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toolchain:
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description: 'what toolchain to use'
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required: true
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default: 'gcc'
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runs:
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using: "composite"
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steps:
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# 1. Setup environment
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- name: Setup build environment
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uses: libbpf/ci/setup-build-env@master
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# 2. Build
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- name: Build kernel image
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shell: bash
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run: ${GITHUB_ACTION_PATH}/build.sh ${{ inputs.arch }} ${{ inputs.toolchain }}
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- name: Build selftests
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shell: bash
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run: ${GITHUB_ACTION_PATH}/build_selftests.sh ${{ inputs.toolchain }}
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env:
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VMLINUX_BTF: ${{ github.workspace }}/vmlinux
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# 3. Test
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- name: Prepare rootfs
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uses: libbpf/ci/prepare-rootfs@master
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with:
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project-name: 'libbpf'
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arch: ${{ inputs.arch }}
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kernel-root: '.'
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- name: Run selftests
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uses: libbpf/ci/run-qemu@master
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with:
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arch: ${{ inputs.arch}}
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img: '/tmp/root.img'
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vmlinuz: '${{ github.workspace }}/vmlinuz'

‎.github/actions/vmtest/build.sh‎

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#!/bin/bash
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set -euo pipefail
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ARCH="$1"
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TOOLCHAIN="$2"
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TOOLCHAIN_NAME="$(echo $TOOLCHAIN | cut -d '-' -f 1)"
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TOOLCHAIN_VERSION="$(echo $TOOLCHAIN | cut -d '-' -f 2)"
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if [ "$TOOLCHAIN_NAME" == "llvm" ]; then
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export LLVM="-$TOOLCHAIN_VERSION"
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fi
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THISDIR="$(cd $(dirname $0) && pwd)"
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source "${THISDIR}"/helpers.sh
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travis_fold start build_kernel "Building kernel with $TOOLCHAIN"
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cp ${GITHUB_WORKSPACE}/travis-ci/vmtest/configs/config-latest.${ARCH} .config
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make -j $((4*$(nproc))) olddefconfig all > /dev/null
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travis_fold end build_kernel

‎.github/actions/vmtest/build_selftests.sh‎

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#!/bin/bash
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set -euo pipefail
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THISDIR="$(cd $(dirname $0) && pwd)"
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source "${THISDIR}"/helpers.sh
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TOOLCHAIN="$1"
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TOOLCHAIN_NAME="$(echo $TOOLCHAIN | cut -d '-' -f 1)"
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TOOLCHAIN_VERSION="$(echo $TOOLCHAIN | cut -d '-' -f 2)"
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if [ "$TOOLCHAIN_NAME" == "llvm" ]; then
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export LLVM="-$TOOLCHAIN_VERSION"
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LLVM_VER=$TOOLCHAIN_VERSION
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else
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LLVM_VER=15
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fi
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travis_fold start prepare_selftests "Building selftests with $TOOLCHAIN"
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LIBBPF_PATH="${REPO_ROOT}"
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PREPARE_SELFTESTS_SCRIPT=${THISDIR}/prepare_selftests-${KERNEL}.sh
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if [ -f "${PREPARE_SELFTESTS_SCRIPT}" ]; then
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(cd "${REPO_ROOT}/${REPO_PATH}/tools/testing/selftests/bpf" && ${PREPARE_SELFTESTS_SCRIPT})
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fi
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if [[ "${KERNEL}" = 'LATEST' ]]; then
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VMLINUX_H=
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else
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VMLINUX_H=${THISDIR}/vmlinux.h
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fi
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cd ${REPO_ROOT}/${REPO_PATH}
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make \
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CLANG=clang-${LLVM_VER} \
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LLC=llc-${LLVM_VER} \
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LLVM_STRIP=llvm-strip-${LLVM_VER} \
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VMLINUX_BTF="${VMLINUX_BTF}" \
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VMLINUX_H="${VMLINUX_H}" \
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-C "${REPO_ROOT}/${REPO_PATH}/tools/testing/selftests/bpf" \
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-j $((4*$(nproc))) > /dev/null
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cd -
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mkdir "${LIBBPF_PATH}"/selftests
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cp -R "${REPO_ROOT}/${REPO_PATH}/tools/testing/selftests/bpf" \
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"${LIBBPF_PATH}"/selftests
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cd "${LIBBPF_PATH}"
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rm selftests/bpf/.gitignore
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git add selftests
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travis_fold end prepare_selftests

‎.github/actions/vmtest/helpers.sh‎

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# $1 - start or end
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# $2 - fold identifier, no spaces
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# $3 - fold section description
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travis_fold() {
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local YELLOW='\033[1;33m'
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local NOCOLOR='\033[0m'
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if [ -z ${GITHUB_WORKFLOW+x} ]; then
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echo travis_fold:$1:$2
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if [ ! -z "${3:-}" ]; then
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echo -e "${YELLOW}$3${NOCOLOR}"
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fi
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echo
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else
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if [ $1 = "start" ]; then
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line="::group::$2"
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if [ ! -z "${3:-}" ]; then
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line="$line - ${YELLOW}$3${NOCOLOR}"
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fi
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else
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line="::endgroup::"
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fi
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echo -e "$line"
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fi
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}
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__print() {
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local TITLE=""
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if [[ -n $2 ]]; then
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TITLE=" title=$2"
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fi
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echo "::$1${TITLE}::$3"
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}
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# $1 - title
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# $2 - message
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print_error() {
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__print error $1 $2
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}
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# $1 - title
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# $2 - message
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print_notice() {
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__print notice $1 $2
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}

‎.github/workflows/test.yml‎

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name: bpf-ci
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on:
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pull_request:
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concurrency:
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group: ci-test-${{ github.head_ref }}
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cancel-in-progress: true
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jobs:
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VM_Test:
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runs-on: ${{ matrix.runs_on }}
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name: Kernel ${{ matrix.kernel }} on ${{ matrix.runs_on }} with ${{ matrix.toolchain }}
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timeout-minutes: 100
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strategy:
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fail-fast: false
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matrix:
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include:
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- kernel: 'LATEST'
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runs_on: ubuntu-latest
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arch: 'x86_64'
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toolchain: 'gcc'
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- kernel: 'LATEST'
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runs_on: ubuntu-latest
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arch: 'x86_64'
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toolchain: 'llvm-15'
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- kernel: 'LATEST'
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runs_on: z15
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arch: 's390x'
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toolchain: 'gcc'
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env:
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AUTHOR_EMAIL: "$(git log -1 --pretty=\"%aE\")"
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KERNEL: LATEST
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REPO_ROOT: ${{ github.workspace }}
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REPO_PATH: ""
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steps:
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- uses: actions/checkout@v2
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- if: ${{ github.repository == 'kernel-patches/vmtest' }}
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name: Download bpf-next tree
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uses: libbpf/ci/get-linux-source@master
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with:
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dest: '.kernel'
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- if: ${{ github.repository == 'kernel-patches/vmtest' }}
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name: Move linux source in place
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shell: bash
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run: |
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rm -rf .kernel/.git
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cp -rf .kernel/. .
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rm -rf .kernel
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- uses: libbpf/ci/patch-kernel@master
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with:
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patches-root: '${{ github.workspace }}/travis-ci/diffs'
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repo-root: '${{ github.workspace }}'
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- uses: ./.github/actions/vmtest
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with:
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arch: ${{ matrix.arch }}
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toolchain: ${{ matrix.toolchain }}

‎README‎

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Linux kernel
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============
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There are several guides for kernel developers and users. These guides can
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be rendered in a number of formats, like HTML and PDF. Please read
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Documentation/admin-guide/README.rst first.
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In order to build the documentation, use ``make htmldocs`` or
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``make pdfdocs``. The formatted documentation can also be read online at:
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https://www.kernel.org/doc/html/latest/
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There are various text files in the Documentation/ subdirectory,
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several of them using the Restructured Text markup notation.
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Please read the Documentation/process/changes.rst file, as it contains the
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requirements for building and running the kernel, and information about
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the problems which may result by upgrading your kernel.

‎travis-ci/diffs/0001-selftests-bpf-Limit-unroll_count-for-pyperf600-test.diff‎

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From 8c89b5db7a2894e33417dd69680729e8f65f5709 Mon Sep 17 00:00:00 2001
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From: Yonghong Song <[email protected]>
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Date: Mon, 18 Apr 2022 21:32:30 -0700
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Subject: [PATCH] selftests/bpf: Limit unroll_count for pyperf600 test
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LLVM commit [1] changed loop pragma behavior such that
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full loop unroll is always honored with user pragma.
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Previously, unroll count also depends on the unrolled
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code size. For pyperf600, without [1], the loop unroll
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count is 150. With [1], the loop unroll count is 600.
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The unroll count of 600 caused the program size close to
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298k and this caused the following code is generated:
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0: 7b 1a 00 ff 00 00 00 00 *(u64 *)(r10 - 256) = r1
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; uint64_t pid_tgid = bpf_get_current_pid_tgid();
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1: 85 00 00 00 0e 00 00 00 call 14
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2: bf 06 00 00 00 00 00 00 r6 = r0
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; pid_t pid = (pid_t)(pid_tgid >> 32);
19+
3: bf 61 00 00 00 00 00 00 r1 = r6
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4: 77 01 00 00 20 00 00 00 r1 >>= 32
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5: 63 1a fc ff 00 00 00 00 *(u32 *)(r10 - 4) = r1
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6: bf a2 00 00 00 00 00 00 r2 = r10
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7: 07 02 00 00 fc ff ff ff r2 += -4
24+
; PidData* pidData = bpf_map_lookup_elem(&pidmap, &pid);
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8: 18 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 r1 = 0 ll
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10: 85 00 00 00 01 00 00 00 call 1
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11: bf 08 00 00 00 00 00 00 r8 = r0
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; if (!pidData)
29+
12: 15 08 15 e8 00 00 00 00 if r8 == 0 goto -6123 <LBB0_27588+0xffffffffffdae100>
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Note that insn 12 has a branch offset -6123 which is clearly illegal
32+
and will be rejected by the verifier. The negative offset is due to
33+
the branch range is greater than INT16_MAX.
34+
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This patch changed the unroll count to be 150 to avoid above
36+
branch target insn out-of-range issue. Also the llvm is enhanced ([2])
37+
to assert if the branch target insn is out of INT16 range.
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[1] https://reviews.llvm.org/D119148
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[2] https://reviews.llvm.org/D123877
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Signed-off-by: Yonghong Song <[email protected]>
43+
Signed-off-by: Alexei Starovoitov <[email protected]>
44+
Link: https://lore.kernel.org/bpf/[email protected]
45+
---
46+
tools/testing/selftests/bpf/progs/pyperf.h | 4 ++++
47+
tools/testing/selftests/bpf/progs/pyperf600.c | 11 +++++++----
48+
2 files changed, 11 insertions(+), 4 deletions(-)
49+
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diff --git a/tools/testing/selftests/bpf/progs/pyperf.h b/tools/testing/selftests/bpf/progs/pyperf.h
51+
index 1ed28882daf3..5d3dc4d66d47 100644
52+
--- a/tools/testing/selftests/bpf/progs/pyperf.h
53+
+++ b/tools/testing/selftests/bpf/progs/pyperf.h
54+
@@ -299,7 +299,11 @@ int __on_event(struct bpf_raw_tracepoint_args *ctx)
55+
#ifdef NO_UNROLL
56+
#pragma clang loop unroll(disable)
57+
#else
58+
+#ifdef UNROLL_COUNT
59+
+#pragma clang loop unroll_count(UNROLL_COUNT)
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+#else
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#pragma clang loop unroll(full)
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+#endif
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#endif /* NO_UNROLL */
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/* Unwind python stack */
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for (int i = 0; i < STACK_MAX_LEN; ++i) {
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diff --git a/tools/testing/selftests/bpf/progs/pyperf600.c b/tools/testing/selftests/bpf/progs/pyperf600.c
67+
index cb49b89e37cd..ce1aa5189cc4 100644
68+
--- a/tools/testing/selftests/bpf/progs/pyperf600.c
69+
+++ b/tools/testing/selftests/bpf/progs/pyperf600.c
70+
@@ -1,9 +1,12 @@
71+
// SPDX-License-Identifier: GPL-2.0
72+
// Copyright (c) 2019 Facebook
73+
#define STACK_MAX_LEN 600
74+
-/* clang will not unroll the loop 600 times.
75+
- * Instead it will unroll it to the amount it deemed
76+
- * appropriate, but the loop will still execute 600 times.
77+
- * Total program size is around 90k insns
78+
+/* Full unroll of 600 iterations will have total
79+
+ * program size close to 298k insns and this may
80+
+ * cause BPF_JMP insn out of 16-bit integer range.
81+
+ * So limit the unroll size to 150 so the
82+
+ * total program size is around 80k insns but
83+
+ * the loop will still execute 600 times.
84+
*/
85+
+#define UNROLL_COUNT 150
86+
#include "pyperf.h"
87+
--
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2.30.2
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‎travis-ci/diffs/0001-selftests-bpf-fix-stacktrace_build_id-with-missing-k.diff‎

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From 0744fe5996e977b7a1634504b6a77426f6384bbe Mon Sep 17 00:00:00 2001
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From: Song Liu <[email protected]>
3+
Date: Thu, 26 May 2022 12:06:12 -0700
4+
Subject: [PATCH bpf] selftests/bpf: fix stacktrace_build_id with missing
5+
kprobe/urandom_read
6+
7+
Kernel function urandom_read is replaced with urandom_read_iter.
8+
Therefore, kprobe on urandom_read is not working any more:
9+
10+
[root@eth50-1 bpf]# ./test_progs -n 161
11+
test_stacktrace_build_id:PASS:skel_open_and_load 0 nsec
12+
libbpf: kprobe perf_event_open() failed: No such file or directory
13+
libbpf: prog 'oncpu': failed to create kprobe 'urandom_read+0x0' \
14+
perf event: No such file or directory
15+
libbpf: prog 'oncpu': failed to auto-attach: -2
16+
test_stacktrace_build_id:FAIL:attach_tp err -2
17+
161 stacktrace_build_id:FAIL
18+
19+
Fix this by replacing urandom_read with urandom_read_iter in the test.
20+
21+
Fixes: 1b388e7765f2 ("random: convert to using fops->read_iter()")
22+
Reported-by: Mykola Lysenko <[email protected]>
23+
Signed-off-by: Song Liu <[email protected]>
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---
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tools/testing/selftests/bpf/progs/test_stacktrace_build_id.c | 2 +-
26+
1 file changed, 1 insertion(+), 1 deletion(-)
27+
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diff --git a/tools/testing/selftests/bpf/progs/test_stacktrace_build_id.c b/tools/testing/selftests/bpf/progs/test_stacktrace_build_id.c
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index 6c62bfb8bb6f..0c4426592a26 100644
30+
--- a/tools/testing/selftests/bpf/progs/test_stacktrace_build_id.c
31+
+++ b/tools/testing/selftests/bpf/progs/test_stacktrace_build_id.c
32+
@@ -39,7 +39,7 @@ struct {
33+
__type(value, stack_trace_t);
34+
} stack_amap SEC(".maps");
35+
36+
-SEC("kprobe/urandom_read")
37+
+SEC("kprobe/urandom_read_iter")
38+
int oncpu(struct pt_regs *args)
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{
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__u32 max_len = sizeof(struct bpf_stack_build_id)
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--
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2.30.2
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‎travis-ci/vmtest/configs/blacklist/BLACKLIST-latest‎

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# TEMPORARY
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btf_dump/btf_dump: syntax
3+
kprobe_multi_test/bench_attach
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core_reloc/enum64val
5+
varlen
6+
core_reloc/size___diff_sz
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core_reloc/type_based___diff_sz

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