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When reverting to a snapshot, the inactive domain configuration has to be rolled back to what it was at the time of the snapshot. Additionally, if the VM is active and the snapshot was active, this now adds a failure if the two configurations are ABI incompatible, rather than risking qemu confusion. A future patch will add a VIR_DOMAIN_SNAPSHOT_FORCE flag, which will be required for two risky code paths - reverting to an older snapshot that lacked full domain information, and reverting from running to a live snapshot that requires starting a new qemu process. Any reverting that stops a running vm is also a form of data loss (discarding the current running state to go back in time), but as that is what reversion usually implies, it is probably not worth requiring a force flag. * src/qemu/qemu_driver.c (qemuDomainSnapshotCreateXML): Copy out domain. (qemuDomainSnapshotCreateXML, qemuDomainRevertToSnapshot): Perform ABI compatibility checks.