Ah, that explains this patchset that was submitted to the Linux kernel today
"KVM: s390: Introduce arm64 KVM"
"By introducing a novel virtualization acceleration for the ARM architecture on s390 architecture, we aim to expand the platform's software ecosystem. This initial patch series lays the groundwork by enabling KVM-accelerated ARM CPU virtualization on s390....."
https://patchwork.kernel.org/project/linux-arm-kernel/cover/...
Z/OS for ARM then? ;-)
I’ve been running VM/370 and MVS on my RPi cluster for a long time now.
But I wonder if this is "much better" than x86 emulation or virt?
Is there really SW that's limited to (Linux) ARM and not x86?
Oh that's a weird way to do it; they used to have an x86 add on block for mainframes which was just a pile of x86 blades with some integration.