Windows images are built by creating and configuring VMs hosted on AWS a1.metal instances then saving the image manually.
Prepare the linux QEMU host image by following the instructions in
Create an a1.metal instance (or other instance that supports KVM) in AWS.
Download a Windows 10 ARM64 image.
Convert vhdx images to qcow2 via the following command:
qemu-image convert -O qcow2 win.vhdx win.qcow2
SSH to your instance tunneling port 5903, and run
win10-arm64.sh script to boot the Windows VM.
sudo systemctl stop qemu
VNC to the tunneled port 5903.
Open the device control panel, and use the “Search for Drivers” button to search the virtio drive
D: for drivers.
startup.ps1 script to the Windows instance, and run in PowerShell. Check thoroughly for errors.
win10-arm64.shto forward ssh access to the VM, and run PowerShell in the CLI, which is a bit easier than through VNC.
Once the image is complete, download the image to your workstation and upload to
Re-run packer to build an AMI with your updated Windows image.
QEMU_EFI.fd is from the
qemu-efi-aarch64 Debian package, found at
/usr/share/qemu-efi-aarch64/QEMU_EFI.fd. It can be regenerated with the following command:
dd if=/dev/zero of=QEMU_EFI.fd bs=1M count=64 dd if=/usr/share/qemu-efi-aarch64/QEMU_EFI.fd of=QEMU_EFI.fd bs=1M count=64 conv=notrunc
QEMU_VARS.fd stores saved EFI state when booting a VM. It's generated via the following command:
dd if=/dev/zero of=QEMU_VARS.fd bs=1M count=64
The latest virtio driver image can be fetched from: https://fedorapeople.org/groups/virt/virtio-win/direct-downloads/latest-virtio/virtio-win.iso
win10-arm64.sh is hard-coded to run with 4 processors instead of the 16 available on an a1.metal instance. Higher numbers of processors are causing a fatal CLOCK_WATCHDOG_TIMEOUT error from interrupt requests not arriving in time. qemu-system-x86_64 has a workaround for this. We're still investigating how to increase this on aarch64.
Create a directory named
macmini-windows, and ensure it contains the following:
macmini-windows/UTM.app (from https://github.com/utmapp/UTM/releases/v2.1.2/download/UTM.dmg) macmini-windows/sysroot-macos-arm64 (from https://github.com/utmapp/UTM/suites/3210727480/artifacts/74269055) macmini-windows/Images/QEMU_EFI.fd (from steps above) macmini-windows/Images/virtio.iso (from https://fedorapeople.org/groups/virt/virtio-win/direct-downloads/latest-virtio/virtio-win.iso) macmini-windows/Images/win10.qcow2 (from above)
Tar the directory:
tar cvJf "windows-arm64.$(date +%+4Y%m%d).tar.xz" macmini-windows
Upload to GCS for safekeeping:
gsutil cp windows-arm64.DATE_FROM_ABOVE.tar.xz gs://go-builder-data/windows-arm64.DATE_FROM_ABOVE.tar.xz
On your target host, untar the directory in your home directory. See x/build/cmd/runqemubuildlet for more information.