The services running on alice seem to require a bit more memory with
Debian bookworm, so increase the memory allocation. But at the same
time reduce winnetou's allocation by the same amount as it really doesn't
require that much memory.
The unit change makes it easier to read.
It might not exist on all platforms and according to the man page:
The kvm wrapper script is used to provide compatibility with old
qemu-kvm package which has been merged into qemu as of version 1.3.
The script executes
qemu-system-x86_64 -enable-kvm
passing all other command-line arguments to the qemu binary.
Closesstrongswan/strongswan#385.
This should give us the best performance and feature set on modern
hardware (in particular when compared to code2duo, which e.g. does not allow
nested virtualization).
Closesstrongswan/strongswan#340.
It's ever so close with strongTNC, sometimes the OOM killer got triggered
and the tests failed, or even worse, the whole guest system got stuck.
This might just be enough for now.
Newer versions of systemd etc. seem to require quite a lot of entropy
from /dev/random while booting, which can block and therefore delay the
start of other services (in particular sshd) by more than a minute.
Using the host's /dev/urandom via VirtIO RNG, we can avoid blocking the
guests.
The required kernel options are added for kernel versions 5.4+.
This avoids having to copy testresults, makes results of cancelled runs
browsable (runs may actually be followed live) and preserves old results
when rebuilding guest images (e.g. when using the build-strongswan script).
The number of consecutive test runs without any intermittent rebuild of the
guest images is also not limited by the image size anymore.
