On 2018-01-08 14:52, Eric Blake wrote: > On 01/07/2018 06:23 AM, Richard Palethorpe wrote: >> Add QAPI wrapper functions for the existing snapshot functionality. These >> functions behave the same way as the HMP savevm, loadvm and delvm >> commands. This will allow applications, such as OpenQA, to programmatically >> revert the VM to a previous state with no dependence on HMP or qemu-img. > > That's already possible; libvirt uses QMP's human-monitor-command to > access these HMP commands programmatically. > > We've had discussions in the past about what it would take to have > specific QMP commands for these operations; the biggest problem is that > these commands promote the use of internal snapshots, and there are > enough performance and other issues with internal snapshots that we are > not yet ready to commit to a long-term interface for making their use > easier. At this point, our recommendation is to prefer external snapshots.
We already have QMP commands for internal snapshots, though. Isn't the biggest issue that savevm takes too much time to be a synchronous QMP command? Max
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