[RFC PATCH v3 00/11] tcg-plugins: add hooks for discontinuities

https://lore.kernel.org/qemu-devel/[email protected]

---

From: Julian Ganz <[email protected]>
To: [email protected]
Cc: Julian Ganz <[email protected]>
Subject: [RFC PATCH v3 00/11] tcg-plugins: add hooks for discontinuities
Date: Mon,  2 Dec 2024 20:26:41 +0100
Message-ID: <[email protected]>
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Some analysis greatly benefits, or depends on, information about
certain types of dicontinuities such as interrupts. For example, we may
need to handle the execution of a new translation block differently if
it is not the result of normal program flow but of an interrupt.

Even with the existing interfaces, it is more or less possible to
discern these situations, e.g. as done by the cflow plugin. However,
this process poses a considerable overhead to the core analysis one may
intend to perform.

These changes introduce a generic and easy-to-use interface for plugin
authors in the form of a callback for discontinuities. Patch 1 defines
an enumeration of some trap-related discontinuities including somewhat
narrow definitions of the discontinuity evetns and a callback type.
Patch 2 defines the callback registration function. Patch 3 adds some
hooks for triggering the callbacks. Patch 4 adds an example plugin
showcasing the new API. Patches 5 through 6 call the hooks for a
selection of architectures, mapping architecture specific events to the
three categories defined in patch 1. Future non-RFC patchsets will call
these hooks for all architectures (that have some concept of trap or
interrupt). Finally, patch 11 supplies a test plugin asserting that the
next PC provided to the plugin points to the next instruction executed.

Sidenote: I'm likely doing something wrong for one architecture or
the other. These patches are untested for most of them.

Since v2 (tcg-plugins: add hooks for interrupts, exceptions and traps):
  - Switched from traps as core concept to more generic discontinuities
  - Switched from semihosting to hostcall as term for emulated traps
  - Added enumeration of events and dedicated callback type
  - Make callback receive event type as well as origin and target PC
    (as requested by Pierrick Bouvier)
  - Combined registration functions for different traps into a single
    one for all types of discontinuities (as requested by Pierrick
    Bouvier)
  - Migrated records in example plugin from fully pre-allocated to a
    scoreboard (as suggested by Pierrick Bouvier)
  - Handle PSCI calls as hostcall (as pointed out by Peter Maydell)
  - Added hooks for ARM Cortex M arches (as pointed out by Peter
    Maydell)
  - Added hooks for Alpha targets
  - Added hooks for MIPS targets
  - Added a plugin for testing some of the interface behaviour

Since v1:
  - Split the one callback into multiple callbacks
  - Added a target-agnostic definition of the relevant event(s)
  - Call hooks from architecture-code rather than accel/tcg/cpu-exec.c
  - Added a plugin showcasing API usage

Julian Ganz (11):
  plugins: add types for callbacks related to certain discontinuities
  plugins: add API for registering discontinuity callbacks
  plugins: add hooks for new discontinuity related callbacks
  contrib/plugins: add plugin showcasing new dicontinuity related API
  target/alpha: call plugin trap callbacks
  target/arm: call plugin trap callbacks
  target/avr: call plugin trap callbacks
  target/mips: call plugin trap callbacks
  target/riscv: call plugin trap callbacks
  target/sparc: call plugin trap callbacks
  tests: add plugin asserting correctness of discon event's to_pc

 contrib/plugins/meson.build         |  3 +-
 contrib/plugins/traps.c             | 96 +++++++++++++++++++++++++++++
 include/qemu/plugin-event.h         |  3 +
 include/qemu/plugin.h               | 13 ++++
 include/qemu/qemu-plugin.h          | 58 +++++++++++++++++
 plugins/core.c                      | 67 ++++++++++++++++++++
 target/alpha/helper.c               | 12 ++++
 target/arm/helper.c                 | 25 ++++++++
 target/arm/tcg/m_helper.c           | 18 ++++++
 target/avr/helper.c                 |  3 +
 target/mips/tcg/sysemu/tlb_helper.c | 11 ++++
 target/riscv/cpu_helper.c           |  9 +++
 target/sparc/int32_helper.c         |  7 +++
 target/sparc/int64_helper.c         | 10 +++
 tests/tcg/plugins/discons.c         | 95 ++++++++++++++++++++++++++++
 tests/tcg/plugins/meson.build       |  2 +-
 16 files changed, 430 insertions(+), 2 deletions(-)
 create mode 100644 contrib/plugins/traps.c
 create mode 100644 tests/tcg/plugins/discons.c

--
2.45.2

Signed-off-by: GitHub Actions Bot <[email protected]>

.github/workflows/build.yml

@@ -0,0 +1,307 @@
+on: push
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  checkapply:
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+      # to debug container live from GitHub
+      # - uses: mxschmitt/action-tmate@v3
+      - run: bash -c '[ ! -f shazam.log ] || { cat shazam.log; exit 1; }'
+
+  checkpatch-ignore-signoff:
+    needs: checkapply
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+      - run: git fetch -a origin --unshallow || true
+      - run: git remote add upstream -f https://gitlab.com/qemu-project/qemu
+      - run: ./scripts/checkpatch.pl --no-signoff $(git merge-base upstream/master HEAD)..HEAD
+
+  checkpatch-with-signoff:
+    needs: checkapply
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+      - run: git fetch -a origin --unshallow || true
+      - run: git remote add upstream -f https://gitlab.com/qemu-project/qemu
+      - run: ./scripts/checkpatch.pl $(git merge-base upstream/master HEAD)..HEAD
+
+  # use docker-run to not rebuild images
+  # images are built daily and pushed on pbolinaro/qemu-ci:*
+  build-cross:
+    needs: checkapply
+    runs-on: ubuntu-24.04
+    strategy:
+      fail-fast: false
+      matrix:
+        container: [alpine,centos9,debian,debian-all-test-cross,debian-amd64-cross,debian-arm64-cross,debian-armhf-cross,debian-hexagon-cross,debian-i686-cross,debian-legacy-test-cross,debian-loongarch-cross,debian-mips64el-cross,debian-mipsel-cross,debian-ppc64el-cross,debian-riscv64-cross,debian-s390x-cross,debian-tricore-cross,fedora,fedora-rust-nightly,opensuse-leap,ubuntu2204]
+    steps:
+      - uses: actions/checkout@v4
+      - run: pip install meson
+      - run: make docker-run J=$(nproc) RUNC=podman TEST=test-build IMAGE=docker.io/pbolinaro/qemu-ci:${{matrix.container}}
+
+  build:
+    needs: checkapply
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+      - run: >
+          podman run --init --rm -it -v $(pwd):$(pwd) -w $(pwd)
+          docker.io/pbolinaro/qemu-ci:debian
+          bash -cx './configure && ninja -C build install'
+      - run: >
+          podman run --init --rm -it -v $(pwd):$(pwd) -w $(pwd)
+          docker.io/pbolinaro/qemu-ci:debian
+          ./build/qemu-system-x86_64 -nographic -plugin ./build/contrib/plugins/libstoptrigger,icount=1000000 -plugin ./build/tests/tcg/plugins/libinsn -d plugin
+
+  build-cross-mingw64:
+    needs: checkapply
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+      - run: >
+          podman run --init --rm -it -v $(pwd):$(pwd) -w $(pwd)
+          docker.io/pbolinaro/qemu-ci:fedora-win64-cross
+          bash -cx './configure $QEMU_CONFIGURE_OPTS && ninja -C build install'
+
+  build-windows:
+    needs: checkapply
+    runs-on: windows-2022
+    strategy:
+      fail-fast: false
+      matrix:
+        sys: [UCRT64, CLANG64, MINGW64]
+    defaults:
+      run:
+        shell: msys2 {0}
+    steps:
+      - uses: msys2/setup-msys2@v2
+        with:
+          update: true
+          msystem: ${{matrix.sys}}
+      - run: pacman -S --noconfirm curl git
+      - uses: actions/checkout@v4
+      - run: >
+            pacman -S --noconfirm
+            base-devel binutils bison diffutils flex git grep make sed
+            ${MINGW_PACKAGE_PREFIX}-toolchain
+            ${MINGW_PACKAGE_PREFIX}-glib2
+            ${MINGW_PACKAGE_PREFIX}-gtk3
+            ${MINGW_PACKAGE_PREFIX}-libnfs
+            ${MINGW_PACKAGE_PREFIX}-libssh
+            ${MINGW_PACKAGE_PREFIX}-ninja
+            ${MINGW_PACKAGE_PREFIX}-pixman
+            ${MINGW_PACKAGE_PREFIX}-pkgconf
+            ${MINGW_PACKAGE_PREFIX}-python
+            ${MINGW_PACKAGE_PREFIX}-SDL2
+            ${MINGW_PACKAGE_PREFIX}-zstd
+      - run: ./configure && ninja -C build
+      - run: ./build/qemu-system-x86_64 -nographic -plugin ./build/contrib/plugins/libstoptrigger,icount=1000000 -plugin ./build/tests/tcg/plugins/libinsn -d plugin
+
+  build-macos-x86_64:
+    needs: checkapply
+    runs-on: macos-13
+    steps:
+      - uses: actions/checkout@v4
+      - run: brew install --quiet $(brew deps --include-build qemu) || true
+      # on macos, werror is not on by default
+      - run: ./configure --enable-werror && ninja -C build
+      - run: ./build/qemu-system-x86_64 -nographic -plugin ./build/contrib/plugins/libstoptrigger,icount=1000000 -plugin ./build/tests/tcg/plugins/libinsn -d plugin
+
+  build-macos-aarch64:
+    needs: checkapply
+    runs-on: macos-14
+    steps:
+      - uses: actions/checkout@v4
+      - run: brew install --quiet $(brew deps --include-build qemu) || true
+      # on macos, werror is not on by default
+      - run: ./configure --enable-werror && ninja -C build
+      - run: ./build/qemu-system-x86_64 -nographic -plugin ./build/contrib/plugins/libstoptrigger,icount=1000000 -plugin ./build/tests/tcg/plugins/libinsn -d plugin
+
+  build-misc:
+    needs: checkapply
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+      - run: >
+          podman run --init --rm -it -v $(pwd):$(pwd) -w $(pwd)
+          docker.io/pbolinaro/qemu-ci:debian
+          bash -cx './configure --disable-user --disable-system --enable-docs --enable-tools && ninja -C build install'
+
+  build-32bits:
+    needs: checkapply
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+      - run: >
+          podman run --init --rm -it -v $(pwd):$(pwd) -w $(pwd)
+          docker.io/pbolinaro/qemu-ci:debian-i686-cross
+          bash -cx './configure $QEMU_CONFIGURE_OPTS && ninja -C build install'
+
+  build-big-endian:
+    needs: checkapply
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+      - run: >
+          podman run --init --rm -it -v $(pwd):$(pwd) -w $(pwd)
+          docker.io/pbolinaro/qemu-ci:debian-s390x-cross
+          bash -cx './configure $QEMU_CONFIGURE_OPTS && ninja -C build install'
+
+  build-debug:
+    needs: checkapply
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+      - run: >
+          podman run --init --rm -it -v $(pwd):$(pwd) -w $(pwd)
+          docker.io/pbolinaro/qemu-ci:debian
+          bash -cx './configure --enable-debug --enable-asan --enable-ubsan && ninja -C build install'
+      - run: >
+          podman run --init --rm -it -v $(pwd):$(pwd) -w $(pwd)
+          docker.io/pbolinaro/qemu-ci:debian
+          ./build/qemu-system-x86_64 -nographic -plugin ./build/contrib/plugins/libstoptrigger,icount=1000000 -plugin ./build/tests/tcg/plugins/libinsn -d plugin
+
+  build-static:
+    needs: checkapply
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+      - run: >
+          podman run --init --rm -it -v $(pwd):$(pwd) -w $(pwd)
+          docker.io/pbolinaro/qemu-ci:debian
+          bash -cx './configure --disable-system --disable-tools --disable-guest-agent --disable-docs --static && ninja -C build install'
+
+  build-tsan:
+    needs: checkapply
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+      - run: >
+          podman run --init --rm -it -v $(pwd):$(pwd) -w $(pwd)
+          docker.io/pbolinaro/qemu-ci:debian
+          bash -cx './configure --enable-tsan && ninja -C build install'
+
+  build-clang:
+    needs: checkapply
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+      - run: >
+          podman run --init --rm -it -v $(pwd):$(pwd) -w $(pwd)
+          docker.io/pbolinaro/qemu-ci:debian
+          bash -cx './configure --cxx=clang++ --cc=clang --host-cc=clang && ninja -C build install'
+
+  build-clang-latest:
+    needs: checkapply
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+      - run: >
+          podman run --init --rm -it -v $(pwd):$(pwd) -w $(pwd)
+          docker.io/pbolinaro/qemu-ci:debian
+          bash -cx 'LLVM_VERSION=19 && apt update && apt install -y lsb-release wget software-properties-common gnupg && wget https://apt.llvm.org/llvm.sh && bash llvm.sh ${LLVM_VERSION} && ./configure --cxx=clang++-${LLVM_VERSION} --cc=clang-${LLVM_VERSION} --host-cc=clang-${LLVM_VERSION} && ninja -C build install'
+
+  build-rust:
+    needs: checkapply
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+      - run: >
+          podman run --init --rm -it -v $(pwd):$(pwd) -w $(pwd)
+          docker.io/pbolinaro/qemu-ci:fedora-rust-nightly
+          bash -cx './configure $QEMU_CONFIGURE_OPTS --enable-rust && ninja -C build install'
+
+  build-disable-tcg:
+    needs: checkapply
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+      - run: >
+          podman run --init --rm -it -v $(pwd):$(pwd) -w $(pwd)
+          docker.io/pbolinaro/qemu-ci:debian
+          bash -cx './configure --disable-tcg && ninja -C build install'
+
+  build-disable-kvm:
+    needs: checkapply
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+      - run: >
+          podman run --init --rm -it -v $(pwd):$(pwd) -w $(pwd)
+          docker.io/pbolinaro/qemu-ci:debian
+          bash -cx './configure --disable-kvm && ninja -C build install'
+
+  build-disable-tcg-kvm-for-xen:
+    needs: checkapply
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+      - run: >
+          podman run --init --rm -it -v $(pwd):$(pwd) -w $(pwd)
+          docker.io/pbolinaro/qemu-ci:debian
+          bash -cx './configure --disable-tcg --disable-kvm && ninja -C build install'
+
+  build-minimal:
+    needs: checkapply
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+      - run: >
+          podman run --init --rm -it -v $(pwd):$(pwd) -w $(pwd)
+          docker.io/pbolinaro/qemu-ci:debian
+          bash -cx './configure --without-default-features --without-default-devices --disable-kvm --disable-tcg && ninja -C build install'
+
+  check-tcg:
+    needs: checkapply
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+      - run: >
+          podman run --init --rm -it -v $(pwd):$(pwd) -w $(pwd)
+          docker.io/pbolinaro/qemu-ci:debian-all-test-cross
+          bash -cx './configure $QEMU_CONFIGURE_OPTS --enable-debug-tcg && ninja -C build'
+      - run: >
+          podman run --init --privileged --rm -it -v $(pwd):$(pwd) -w $(pwd)
+          docker.io/pbolinaro/qemu-ci:debian-all-test-cross
+          bash -cx "make -k check-tcg"
+
+  # run all meson tests, including functional. Run -j1 to avoid sporadic issues.
+  check:
+    needs: checkapply
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+      # we use image with download cache filled. Solves servers flakiness.
+      - run: >
+          podman run --init --rm -it -v $(pwd):$(pwd) -w $(pwd)
+          docker.io/pbolinaro/qemu-ci:debian-precache-tests
+          bash -cx './configure --enable-debug-tcg && ninja -C build'
+      - run: sudo chown $USER:$USER /dev/kvm
+      - run: >
+          podman run --init --privileged --rm -it -v /dev/kvm:/dev/kvm -v $(pwd):$(pwd) -w $(pwd)
+          docker.io/pbolinaro/qemu-ci:debian-precache-tests
+          bash -cx "make -k check SPEED=thorough TIMEOUT_MULTIPLIER=5"
+
+  check-avocado:
+    needs: checkapply
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+      # add more time for all tests
+      - run: sed -i -e 's/timeout = .*/timeout = 3600/' $(find tests/avocado/ -type f)
+      # we use image with download cache filled. Solves servers flakiness.
+      - run: >
+          podman run --init --rm -it -v $(pwd):$(pwd) -w $(pwd)
+          docker.io/pbolinaro/qemu-ci:debian-precache-tests
+          bash -cx './configure --enable-debug-tcg && ninja -C build'
+      - run: sudo chown $USER:$USER /dev/kvm
+      - run: >
+          podman run --init --privileged --rm -it -v /dev/kvm:/dev/kvm -v $(pwd):$(pwd) -w $(pwd)
+          docker.io/pbolinaro/qemu-ci:debian-precache-tests
+          bash -cx "make -k check-avocado"

.github/workflows/containers.yml

@@ -0,0 +1,54 @@
+on:
+  schedule:
+    - cron: '0 6 * * *'
+  workflow_dispatch:
+
+permissions: write-all
+
+jobs:
+  build_container:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        # cd tests/docker/dockerfiles/
+        # ls *docker | sed -e 's/.docker//' | tr '\n' ','
+        # remove: debian-bootstrap,debian-toolchain
+        container: [alpine,centos9,debian-all-test-cross,debian-amd64-cross,debian-arm64-cross,debian-armhf-cross,debian,debian-hexagon-cross,debian-i686-cross,debian-legacy-test-cross,debian-loongarch-cross,debian-mips64el-cross,debian-mipsel-cross,debian-ppc64el-cross,debian-riscv64-cross,debian-s390x-cross,debian-tricore-cross,debian-xtensa-cross,fedora,fedora-rust-nightly,fedora-win64-cross,opensuse-leap,python,ubuntu2204]
+    steps:
+      - uses: actions/checkout@v4
+      - run: make docker-image-${{matrix.container}} RUNC=podman V=1
+      - run: podman tag qemu/${{matrix.container}} docker.io/pbolinaro/qemu-ci:${{matrix.container}}
+      - run: podman login -u pbolinaro -p ${{secrets.DOCKERHUB_PASSWORD}}
+      - run: podman push docker.io/pbolinaro/qemu-ci:${{matrix.container}}
+
+  build_container_debian-precache-tests:
+    runs-on: ubuntu-latest
+    steps:
+      # we clean up runner first, to get more disk space
+      - run: docker system prune -af && sudo rm -rf /opt/*
+      - uses: actions/checkout@v4
+      - run: make docker-image-debian RUNC=podman V=1
+      # fill download cache for functional and check-avocado
+      # running check-avocado without any qemu binary will only download data
+      # in /root/avocado
+      - run: >
+          podman run -it -v $(pwd):$(pwd) -w $(pwd) qemu/debian
+          ./precache_tests.sh
+      # commit result as a new image. Cache will be in /root/.cache and /root/avocado
+      - run: podman commit "$(podman ps -aq)" docker.io/pbolinaro/qemu-ci:debian-precache-tests
+      - run: podman login -u pbolinaro -p ${{secrets.DOCKERHUB_PASSWORD}}
+      - run: podman push docker.io/pbolinaro/qemu-ci:debian-precache-tests
+
+  keepalive-job:
+    name: Keepalive Workflow
+    if: ${{ always() }}
+    needs: build_container
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - uses: actions/checkout@v4
+      - uses: gautamkrishnar/keepalive-workflow@v2
+        with:
+          use_api: false