IBM SEL(Secure Execution for Linux) is supported for s390
KVM guests. SEL images used to start a confidential computing
protected guest contain an encrypted boot image which encapsulates
the kernel the initrd and the bootparams. The encrypted Image is
provided by the KVM/hypervisor to the Embedded zFirmware of the
system (the ultravisor device). The decryption keys are hardware
based and each system has an individual keypool unique to that
system. The root filesystem is LUKS encrypted with a random key
produced by kiwi at build time and kept inside of the initrd which
exists only inside of the encrypted boot image and the encrypted
rootfs to allow kernel updates. The commit to support secure
execution also comes with an integration test that provides
profiled image builds to target SUSE's LinuxONE as well
as IBM Cloud systems.
b922d8ba2d