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It is necessary to backport the libvirt components of the 

"Time sync after resuming from suspend" feature,
https://bugzilla.redhat.com/show_bug.cgi?id=1049038

as requested by

"[RFE] Clock in KVM guest is not up-to-date after save-to-disk/restore"
https://bugzilla.redhat.com/show_bug.cgi?id=1115340.

I've sent Michal a qemu-kvm build with rtc-reset-reinjection command.

The RHEL-6.7-beta qemu-kvm build already contains a qemu guest agent 
which supports "guest-set-time" without parameters.

Unfortunately, there's nothing libvirt can do in here. When implementing this feature in RHEL-7 I've invented this new API virDomainSetTime() which is, however, missing in RHEL-6. And to preserve ABI stability we can't backport an API.

But there's a workaround though. Since Marcello has backported the 'rtc-reset-reinjection' command, users can:
1) issue 'guest-set-time' via libvirt API
2) issue 'rtc-reset-reinjection', yet again via libvirt

Using virsh it boils down to the following:

virsh qemu-agent-command $dom '{"execute":"guest-set-time"}'
virsh qemu-monitor-command $dom '{"execute":"rtc-reset-reinjection"}'

I'm closing this one meanwhile.