Bug#961057: debian-installer: qemu-system-s390x installation fails due to missing modules

[Valentin Vidic <vvidic@debian.org>]

Package: debian-installer
Version: 20190702+deb10u4
Severity: important

Dear Maintainer,

Installer initrd does not include modules virtio_blk and virtio_net
(+dependencies) preventing a successful installation inside a QEMU VM:

$ virt-install --arch=s390x --name test --memory 1024 --disk test.img \
  --extra-args=console=ttyS0 \
  -l http://ftp.de.debian.org/debian/dists/buster/main/installer-s390x/

-- System Information:
Debian Release: 10.4
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.19.0-9-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled