setup-build-env: Decouple from Ubuntu

.github/workflows/kernel-build.yml

@@ -64,10 +64,25 @@ jobs:
         KBUILD_OUTPUT: ${{ github.workspace }}/kbuild-output
         KERNEL: ${{ inputs.kernel }}
         KERNEL_ROOT: ${{ github.workspace }}
+        REFERENCE_REPO_PATH: /libbpfci/mirrors/linux
         REPO_PATH: ""
         REPO_ROOT: ${{ github.workspace }}
         RUNNER_TYPE: ${{ contains(fromJSON(inputs.runs_on), 'codebuild') && 'codebuild' || 'default' }}
     steps:
+
+      # git version 2.43.0 (current Ubuntu 24 installation)
+      # does not support git clone --revision option
+      # so make sure latest git is installed
+      - name: Install latest git
+        shell: bash
+        run: |
+            sudo apt-get update
+            sudo apt-get install -y software-properties-common
+            sudo add-apt-repository -y ppa:git-core/ppa
+            sudo apt-get update
+            sudo apt-get install -y git
+            git --version
+
       - uses: actions/checkout@v4
         with:
           fetch-depth: ${{ inputs.download_sources && 1 || env.BPF_NEXT_FETCH_DEPTH }}
@@ -87,7 +102,7 @@ jobs:
 
       - uses: ./prepare-incremental-build
         with:
-          repo-root: ${{ inputs.download_sources && '.kernel' || env.REPO_ROOT }}
+          repo-root: '.kernel'
           base-branch: >-
             ${{    inputs.download_sources && env.BPF_NEXT_BASE_BRANCH
                 || github.event_name == 'pull_request' && github.base_ref
@@ -96,12 +111,12 @@ jobs:
           arch: ${{ inputs.arch }}
           toolchain_full: ${{ inputs.toolchain_full }}
           kbuild-output: ${{ env.KBUILD_OUTPUT }}
-      - if: ${{ inputs.download_sources }}
-        name: Move linux source in place
+
+      - name: Move linux source in place
         shell: bash
         run: |
           cd .kernel
-          rm -rf .git
+          rm -rf .git .github ci
           mv -t .. $(ls -A)
           cd ..
           rmdir .kernel

.github/workflows/kernel-test.yml

@@ -72,6 +72,8 @@ jobs:
           KERNEL_TEST: ${{ inputs.test }}
           SELFTESTS_BPF: ${{ github.workspace }}/selftests/bpf
           VMTEST_CONFIGS: ${{ github.workspace }}/ci/vmtest/configs
+          VMTEST_MEMORY: 5G
+          VMTEST_NUM_CPUS: 2
           TEST_PROGS_TRAFFIC_MONITOR: ${{ inputs.arch == 'x86_64' && 'true' || '' }}
           TEST_PROGS_WATCHDOG_TIMEOUT: 600
         with:

.github/workflows/test.yml

@@ -18,8 +18,8 @@ jobs:
         build_runs_on: ["ubuntu-24.04"]
         arch: ["x86_64"]
         kernel_compiler: ["gcc", "llvm"]
-        gcc_version: [15]
-        llvm_version: [20]
+        gcc_version: [14]
+        llvm_version: [21]
         kernel: ["LATEST"]
         build_release: [false]
         tests:
@@ -28,7 +28,7 @@ jobs:
             - {"test": "test_progs_no_alu32", "continue_on_error": false, "timeout_minutes": 360}
             - {"test": "test_verifier", "continue_on_error": false, "timeout_minutes": 360}
             - {"test": "test_maps", "continue_on_error": false, "timeout_minutes": 360}
-            - {"test": "sched_ext", "continue_on_error": false, "timeout_minutes": 360}
+            # - {"test": "sched_ext", "continue_on_error": false, "timeout_minutes": 360}
             # - {"test": "test_progs-bpf_gcc", "continue_on_error": false, "timeout_minutes": 360}
       fail-fast: false
 

build-selftests/build_selftests.sh

@@ -39,6 +39,7 @@ MAKE_OPTS=$(cat <<EOF
 	CROSS_COMPILE=${CROSS_COMPILE}
 	CLANG=clang-${LLVM_VERSION}
 	LLC=llc-${LLVM_VERSION}
+	LLVM_CONFIG=llvm-config-${LLVM_VERSION}
 	LLVM_STRIP=llvm-strip-${LLVM_VERSION}
 	VMLINUX_BTF=${VMLINUX_BTF}
 	VMLINUX_H=${VMLINUX_H}

run-vmtest/install-dependencies.sh

@@ -9,6 +9,8 @@ sudo chmod 755 /usr/bin/vmtest
 
 sudo apt-get update -y
 sudo -E apt-get install --no-install-recommends -y \
-     binutils cpu-checker ethtool gawk iproute2 iptables iputils-ping keyutils libpcap-dev make
+     binutils cpu-checker ethtool gawk iproute2 iptables iputils-ping \
+     keyutils libpcap-dev llvm-dev libz3-4 make zlib1g
+
 sudo -E apt-get install --no-install-recommends -y \
      qemu-guest-agent qemu-kvm qemu-system-arm qemu-system-s390x qemu-system-x86 qemu-utils

setup-build-env/action.sh

@@ -7,7 +7,7 @@ export GITHUB_ACTION_PATH=${GITHUB_ACTION_PATH:-$(pwd)}
 export PAHOLE_BRANCH=${PAHOLE_BRANCH:-master}
 export PAHOLE_ORIGIN=${PAHOLE_ORIGIN:-https://git.kernel.org/pub/scm/devel/pahole/pahole.git}
 export GCC_VERSION=${GCC_VERSION:-15}
-export LLVM_VERSION=${LLVM_VERSION:-20}
+export LLVM_VERSION=${LLVM_VERSION:-21}
 export TARGET_ARCH=${TARGET_ARCH:-$(uname -m)}
 
 # gcc >= 15 is not available in Ubuntu 24

setup-build-env/build_pahole.sh

@@ -26,11 +26,9 @@ git remote add origin ${PAHOLE_ORIGIN}
 git fetch --depth=1 origin "${PAHOLE_BRANCH}"
 git checkout "${PAHOLE_BRANCH}"
 
-mkdir -p build
-cd build
-cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo -D__LIB=lib ..
-make -j$((4*$(nproc)))
-sudo make install
+cmake -Bbuild -DCMAKE_BUILD_TYPE=RelWithDebInfo -DCMAKE_INSTALL_PREFIX=/usr
+make -C build -j$(nproc)
+sudo make -C build install
 
 export LD_LIBRARY_PATH=${LD_LIBRARY_PATH:-}:/usr/local/lib
 ldd $(which pahole)

setup-build-env/install_clang.sh

@@ -12,6 +12,6 @@ sudo -E apt-get install --no-install-recommends -y \
 
 curl -O https://apt.llvm.org/llvm.sh
 chmod +x llvm.sh
-sudo ./llvm.sh ${LLVM_VERSION}
+sudo ./llvm.sh ${LLVM_VERSION} all
 
 foldable end install_clang

setup-build-env/install_cross_compilation_toolchain.sh

@@ -20,31 +20,34 @@ source /etc/os-release
 DEB_ARCH="$(platform_to_deb_arch "${TARGET_ARCH}")"
 DEB_HOST_ARCH="$(dpkg --print-architecture)"
 GCC_VERSION=${GCC_VERSION:-14}
-UBUNTU_CODENAME=${UBUNTU_CODENAME:-noble}
 
-if [ "${GCC_VERSION}" -ge 15 ]; then
-    UBUNTU_CODENAME=${UBUNTU_CODENAME_OVERRIDE}
-fi
+if [ "${ID}" == "ubuntu" ]; then
+     UBUNTU_CODENAME=${UBUNTU_CODENAME:-noble}
+     if [ "${GCC_VERSION}" -ge 15 ]; then
+          UBUNTU_CODENAME=${UBUNTU_CODENAME_OVERRIDE}
+     fi
 
-# Disable other apt sources for foreign architectures to avoid 404 errors
-# Only allow fetching packages for the added architecture from ports.ubuntu.com
-sudo tee /etc/apt/apt.conf.d/99-no-foreign-arch <<APT_CONF
+     # Disable other apt sources for foreign architectures to avoid 404 errors
+     # Only allow fetching packages for the added architecture from ports.ubuntu.com
+     sudo tee /etc/apt/apt.conf.d/99-no-foreign-arch <<APT_CONF
 APT::Architectures "${DEB_HOST_ARCH}";
 APT::Architectures:: "${DEB_ARCH}";
 APT_CONF
 
-sudo dpkg --add-architecture "$DEB_ARCH"
-cat <<EOF | sudo tee /etc/apt/sources.list.d/xcompile.sources
+     cat <<EOF | sudo tee /etc/apt/sources.list.d/xcompile.sources
 Types: deb
 URIs: http://ports.ubuntu.com/ubuntu-ports
 Suites: ${UBUNTU_CODENAME} ${UBUNTU_CODENAME}-updates ${UBUNTU_CODENAME}-security
 Components: main restricted universe multiverse
 Architectures: ${DEB_ARCH}
 Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg
 EOF
+fi
 
+sudo dpkg --add-architecture "$DEB_ARCH"
 sudo apt-get update -y
 sudo apt-get install -y --no-install-recommends    \
+     binfmt-support qemu-user-static               \
      "gcc-${GCC_VERSION}-${TARGET_ARCH}-linux-gnu" \
      "g++-${GCC_VERSION}-${TARGET_ARCH}-linux-gnu" \
      "linux-libc-dev:${DEB_ARCH}"                  \

setup-build-env/install_packages.sh

@@ -12,7 +12,7 @@ foldable start install_packages
 
 source /etc/os-release
 
-if [[ "$GCC_VERSION" -ge 15 && "${UBUNTU_CODENAME}" != "${UBUNTU_CODENAME_OVERRIDE}" ]]; then
+if [[ "$ID" == "ubuntu" && $GCC_VERSION -ge 15 && "${UBUNTU_CODENAME}" != "${UBUNTU_CODENAME_OVERRIDE}" ]]; then
     UBUNTU_CODENAME=${UBUNTU_CODENAME_OVERRIDE}
     cat <<EOF | sudo tee /etc/apt/sources.list.d/${UBUNTU_CODENAME}.list
 deb http://archive.ubuntu.com/ubuntu ${UBUNTU_CODENAME} main universe
@@ -28,10 +28,12 @@ fi
 
 sudo apt-get update -y
 
-# add git-core/ppa to install latest git version
-sudo -E apt-get install -y software-properties-common
-sudo add-apt-repository -y ppa:git-core/ppa
-sudo apt-get update -y
+if [[ "$ID" == "ubuntu" ]]; then
+     # add git-core/ppa to install latest git version
+     sudo -E apt-get install -y software-properties-common
+     sudo add-apt-repository -y ppa:git-core/ppa
+     sudo apt-get update -y
+fi
 
 sudo -E apt-get install --no-install-recommends -y                     \
      bc bison build-essential cmake cpu-checker curl dumb-init         \