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+++ This bug was initially created as a clone of Bug #766958 +++ qemu is adding interfaces to allow the guest to be told to enter s4. Libvirt should support those interfaces.
In the case of virt-manager we're not speaking about api but to change the implementation of suspend guest from live migration to file towards internal s4.
Dor's follow up of changing managedsave->s4 is unlikely to happen and I don't think is what users will ever want, so just closing this as WONTFIX.