I am pleased to announce the official release of Virt SIG Xen packages for CentOS 7.
* Install CentOS-release-xen from CentOS-extras
yum install CentOS-release-xen
* Update to get the new kernel:
* Install the Xen packages from the CentOS-virt-xen repo:
yum install xen
There are also packages for libvirt 1.3.0 (which should be compatible with openstack) and virt-manager.
Please report any bugs you find in the packaging here.