I tried some more:

4.10 rc3 does have the patch:
ubuntu@ubu-vm-01:~$ uname -a
Linux ubu-vm-01 4.10.0-041000rc3-generic #201701081831 SMP Mon Jan 9 00:34:16 
UTC 2017 s390x s390x s390x GNU/Linux
ubuntu@ubu-vm-01:~$ kvm-ok 
INFO: /dev/kvm does not exist
HINT:   sudo modprobe kvm
INFO: For more detailed results, you should run this as root
HINT:   sudo /usr/sbin/kvm-ok
ubuntu@ubu-vm-01:~$ ls -la /dev/kvm
ls: cannot access '/dev/kvm': No such file or directory

4.10-rc2 seems to be the last one without:

ubuntu@ubu-vm-01:~$ uname -a
Linux ubu-vm-01 4.10.0-041000rc2-generic #201701011831 SMP Mon Jan 2 00:41:33 
UTC 2017 s390x s390x s390x GNU/Linux
ubuntu@ubu-vm-01:~$ kvm-ok 
INFO: /dev/kvm exists
KVM acceleration can be used
ubuntu@ubu-vm-01:~$ ls -la /dev/kvm
crw------- 1 root root 10, 232 Mar 20 07:41 /dev/kvm

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Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1735420

Title:
  Avoid creation of /dev/kvm in Xenial KVM virtual machines on s390x

Status in Ubuntu on IBM z Systems:
  Triaged
Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Xenial:
  Triaged

Bug description:
  Since nested virtualization with KVM is not supported on s390x, please 
disable this in Xenial - in case it's doable with reasonable effort.
  (I think it was already disabled for later Ubuntu releases ... was also 
discussed on IRC)

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-z-systems/+bug/1735420/+subscriptions

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