Re: qemu no-shutdown feature in libvirt

On Mon, Nov 30, 2020 at 14:45:18 -0500, Luna Xu wrote: > Hi developers, Hi, [...] > When I start a VM with the qemu command I can specify the -no-shutdown > flag so that my qemu process doesn't quit even if I shutdown the VM > from the inside (issue shutdown or halt command inside VM). The VM is > shutdown but the qemu process is not killed so that the jobs I > submitted before for example backup (drive-backup) can continue to run > even after VM gets shutdown by the user, and I'm able to check the > status of the job through qmp commands (by communicating with the qemu > process). As I've noted in my reply on libvirt-users, we currently don't support this on the shutdown part of the VM lifecycle. On the startup part you can use VIR_DOMAIN_START_PAUSED for a VM which didn't yet excecute any guest instructions. > Is anyone aware of any project that is currently implementing this > functionality? Thanks for reading. I don't think that there's anybody working on it. If you are interested in implementing the feature the idea would be to add a 'pause' action for <on_poweroff>pause</on_poweroff> along with a new 'virDomainPausedReason' such as VIR_DOMAIN_PAUSED_POWEROFF and implement the lifecycle transition from PAUSED -> RUNNING via qemuDomainResume, which would in this case have to issue a 'system-reset' qmp command and emit the appropriate events.