qemu from home:olh:xen-4.20 project

对于 SLE 15，请以根用户 root 运行下面命令：

zypper addrepo https://download.opensuse.org/repositories/home:olh:xen-4.20/SLE_15/home:olh:xen-4.20.repo
zypper refresh
zypper install qemu