[CentOS] question about upgrade qemu and libvirtd

Hi Team, I am not sure if I should put my question here, I have googled long time, no explicit information found.

Background: We need to support KVM encryption and decided to use LUKS.

Refer to:https://libvirt.org/formatsecret.html#VolumeUsageType

libvirtd and KVM should be able to support LUKS format disk directly.

Unfortunately, seems that we need to use libvirt2.2+ and qemu 2.6+, because our current qemu-kvm version does not support luks format:

And our hypervisor's OS is CentOS 7.2 with libvirt 2.0 and qemu-kvm 1.5.3

Question: Is there any safe way to upgrade to libvirt 2.2 and qemu 2.6? Safe way means: do not need to reboot hyper or VM, do not impact VM types support .

Any suggestion is welcome.

Thanks.