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I wonder how this will play out on Red Hat now that Xen's been cut from RHEL6 (in favor of KVM)?

Red Hat used to not care about Xen, and now they still don't care. But as long as they don't deliberately break it, I guess RHEL 7 will inherit Xen support for free from upstream Linux.

[Not speaking on behalf of Red Hat]

Even in RHEL 6 we have support for RHEL as a Xen guest.

However as aliguori says above, "Xen in Linux" is a misnomer: Xen is a separate and completely different kernel (the "Xen hypervisor") and it seems unlikely we'll be shipping that any time soon. No one gets rich by providing paid support for two completely different and incompatible kernels.

In theory libvirt should support Xen as the hypervisor instead of kvm just fine.

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