I wasn't able to compile the kvm-pr kernel module because there is something wrong in the source code. I think the problem is in the latest KVM updates.
Note: If you want to compile the kernel, then you have to patch the kernel source code with the Nemo patch. For the PR KVM support you have to patch the kernel source code with the kvm-pr patch additionally.
I successfully tested the new PR KVM with a virtual Power Mac G3 machine today.
Note: If you want to compile the kernel, then you have to patch the kernel source code with the Nemo patch. For the PR KVM support you have to patch the kernel source code with the kvm-pr patch additionally.