libvirt-daemon from home:olh:xen-4.18 project

需要 SLE 15 ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/home:olh:xen-4.18/SLE_15/home:olh:xen-4.18.repo
zypper refresh
zypper install libvirt-daemon