[PATCH v5 2/2] gitlab-ci: add an ARM32 qemu-based smoke test

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

Add a minimal ARM32 smoke test based on qemu-system-arm, as provided by
the test-artifacts qemu container. The minimal test simply boots Xen
(built from previous build stages) and Dom0.

The test needs a working kernel and minimal initrd for dom0. Instead of
building our own kernel and initrd, which would mean maintaining one or
two more builting scripts under automation/, we borrow a kernel and
initrd from distros.

For the kernel we pick the Debian Bullseye kernel, which has everything
we need already built-in. However, we cannot use the Debian Bullseye
initrd because it is 22MB and the large size causes QEMU to core dump.

Instead, use the tiny busybox-based rootfs provided by Alpine Linux,
which is really minimal: just 2.5MB. Note that we cannot use the Alpine
Linux kernel because that doesn't boot on Xen.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxx>
---
Changes in v5:
- use "virt" machine in QEMU
- remove init= option

Changes in v4:
- improve commit message
- use Debian Bullseye kernel
- use Alpine Linux initrd

---
 automation/gitlab-ci/test.yaml         | 23 ++++++++
 automation/scripts/qemu-smoke-arm32.sh | 81 ++++++++++++++++++++++++++
 2 files changed, 104 insertions(+)
 create mode 100755 automation/scripts/qemu-smoke-arm32.sh

diff --git a/automation/gitlab-ci/test.yaml b/automation/gitlab-ci/test.yaml
index ec2a2e1607..42cd725a12 100644
--- a/automation/gitlab-ci/test.yaml
+++ b/automation/gitlab-ci/test.yaml
@@ -95,6 +95,29 @@ qemu-smoke-arm64-gcc:
     - /^coverity-tested\/.*/
     - /^stable-.*/
 
+qemu-smoke-arm32-gcc:
+  stage: test
+  image: registry.gitlab.com/xen-project/xen/${CONTAINER}
+  variables:
+    CONTAINER: debian:unstable-arm64v8
+  script:
+    - ./automation/scripts/qemu-smoke-arm32.sh 2>&1 | tee qemu-smoke-arm32.log
+  dependencies:
+    - debian-unstable-gcc-arm32
+    - qemu-system-aarch64-6.0.0-arm32-export
+  artifacts:
+    paths:
+      - smoke.serial
+      - '*.log'
+    when: always
+  tags:
+    - arm64
+  except:
+    - master
+    - smoke
+    - /^coverity-tested\/.*/
+    - /^stable-.*/
+
 qemu-smoke-x86-64-gcc:
   stage: test
   image: registry.gitlab.com/xen-project/xen/${CONTAINER}
diff --git a/automation/scripts/qemu-smoke-arm32.sh 
b/automation/scripts/qemu-smoke-arm32.sh
new file mode 100755
index 0000000000..15e6f46ce9
--- /dev/null
+++ b/automation/scripts/qemu-smoke-arm32.sh
@@ -0,0 +1,81 @@
+#!/bin/bash
+
+set -ex
+
+export DEBIAN_FRONTENT=noninteractive
+apt-get -qy update
+apt-get -qy install --no-install-recommends device-tree-compiler \
+                                            curl \
+                                            cpio
+
+cd binaries
+# Use the kernel from Debian
+curl --fail --silent --show-error --location --output vmlinuz 
http://http.us.debian.org/debian/dists/bullseye/main/installer-armhf/current/images/netboot/vmlinuz
+# Use a tiny initrd based on busybox from Alpine Linux
+curl --fail --silent --show-error --location --output initrd.tar.gz 
https://dl-cdn.alpinelinux.org/alpine/v3.15/releases/armhf/alpine-minirootfs-3.15.1-armhf.tar.gz
+
+mkdir rootfs
+cd rootfs
+tar xvzf ../initrd.tar.gz
+find . | cpio -H newc -o | gzip > ../initrd.gz
+cd ..
+
+kernel=`stat -L --printf="%s" vmlinuz`
+initrd=`stat -L --printf="%s" initrd.gz`
+
+# For Xen, we need a couple of more node. Dump the DT from QEMU and add them
+# XXX QEMU looks for "efi-virtio.rom" even if it is unneeded
+curl -fsSLO https://github.com/qemu/qemu/raw/v5.2.0/pc-bios/efi-virtio.rom
+./qemu-system-arm \
+   -machine virt \
+   -machine virtualization=true \
+   -smp 4 \
+   -m 1024 \
+   -serial stdio \
+   -monitor none \
+   -display none \
+   -machine dumpdtb=virt.dtb
+
+dtc -I dtb -O dts virt.dtb > virt.dts
+
+cat >> virt.dts << EOF
+/ {
+       chosen {
+               #address-cells = <0x2>;
+               #size-cells = <0x2>;
+               stdout-path = "/pl011@9000000";
+        xen,xen-bootargs = "console=dtuart dtuart=/pl011@9000000 dom0_mem=512M 
bootscrub=0";
+               xen,dom0-bootargs = "console=tty0 console=hvc0 earlyprintk 
clk_ignore_unused root=/dev/ram0 rdinit=/bin/sh";
+               dom0 {
+                       compatible = "xen,linux-zimage", "xen,multiboot-module";
+                       reg = <0x0 0x1000000 0x0 $kernel>;
+               };
+        dom0-ramdisk {
+                       compatible = "xen,linux-initrd", "xen,multiboot-module";
+                       reg = <0x0 0x3200000 0x0 $initrd>;
+               };
+       };
+};
+EOF
+dtc -I dts -O dtb virt.dts > virt.dtb
+
+rm -f smoke.serial
+set +e
+timeout -k 1 240 \
+./qemu-system-arm \
+   -machine virt-6.0 \
+   -machine virtualization=true \
+   -smp 4 \
+   -m 1024 \
+   -serial stdio \
+   -monitor none \
+   -display none \
+   -dtb virt.dtb \
+   -no-reboot \
+   -kernel ./xen \
+   -device loader,file=./vmlinuz,addr=0x1000000 \
+   -device loader,file=./initrd.gz,addr=0x3200000 |& tee smoke.serial
+
+set -e
+(grep -q "^/ #" smoke.serial) || exit 1
+exit 0
-- 
2.25.1