kernel-rt from home:avicenzi:xen-on-arm project
Select Your Operating System
Add repository and install manually
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:avicenzi:xen-on-arm/15.4/home:avicenzi:xen-on-arm.repo zypper refresh zypper install kernel-rt