Ensure failure to talk to Xen hypervisor is fatal when privileged
As per the comment, the Xen hypervisor driver is considered to be mandatory when running privileged. When it fails to open, we should thus return an error, not ignore it.
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As per the comment, the Xen hypervisor driver is considered to be mandatory when running privileged. When it fails to open, we should thus return an error, not ignore it.