[PATCH for-next 6/6] automation: add container for riscv64 builds

[Connor Davis <connojdavis@xxxxxxxxx>]

Add a container for cross-compiling xen to riscv64.
This just includes the cross-compiler and necessary packages for
building xen itself (packages for tools, stubdoms, etc., can be
added later).

To build xen in the container run the following:

$ make XEN_TARGET_ARCH=riscv64 SUBSYSTEMS=xen

Signed-off-by: Connor Davis <connojdavis@xxxxxxxxx>
---
 automation/build/archlinux/riscv64.dockerfile | 32 +++++++++++++++++++
 automation/scripts/containerize               |  1 +
 2 files changed, 33 insertions(+)
 create mode 100644 automation/build/archlinux/riscv64.dockerfile

diff --git a/automation/build/archlinux/riscv64.dockerfile 
b/automation/build/archlinux/riscv64.dockerfile
new file mode 100644
index 0000000000..d94048b6c3
--- /dev/null
+++ b/automation/build/archlinux/riscv64.dockerfile
@@ -0,0 +1,32 @@
+FROM archlinux/base
+LABEL maintainer.name="The Xen Project" \
+      maintainer.email="xen-devel@xxxxxxxxxxxxxxxxxxxx"
+
+# Packages needed for the build
+RUN pacman --noconfirm -Syu \
+    base-devel \
+    gcc \
+    git
+
+# Packages needed for QEMU
+RUN pacman --noconfirm -Syu \
+    pixman \
+    python \
+    sh
+
+# There is a regression in GDB that causes an assertion error
+# when setting breakpoints, use this commit until it is fixed!
+RUN git clone --recursive -j$(nproc) --progress 
https://github.com/riscv/riscv-gnu-toolchain && \
+    cd riscv-gnu-toolchain/riscv-gdb && \
+    git checkout 1dd588507782591478882a891f64945af9e2b86c && \
+    cd  .. && \
+    ./configure --prefix=/opt/riscv && \
+    make linux -j$(nproc) && \
+    rm -R /riscv-gnu-toolchain
+
+# Add compiler path
+ENV PATH=/opt/riscv/bin/:${PATH}
+
+RUN useradd --create-home user
+USER user
+WORKDIR /build
diff --git a/automation/scripts/containerize b/automation/scripts/containerize
index da45baed4e..1901e8c0ef 100755
--- a/automation/scripts/containerize
+++ b/automation/scripts/containerize
@@ -25,6 +25,7 @@ die() {
 BASE="registry.gitlab.com/xen-project/xen"
 case "_${CONTAINER}" in
     _archlinux|_arch) CONTAINER="${BASE}/archlinux:current" ;;
+    _riscv64) CONTAINER="${BASE}/archlinux:riscv64" ;;
     _centos7) CONTAINER="${BASE}/centos:7" ;;
     _centos72) CONTAINER="${BASE}/centos:7.2" ;;
     _fedora) CONTAINER="${BASE}/fedora:29";;
-- 
2.27.0