how to get vm uptime through libvirt api

[Daniel P. Berrangé]

On Tue, Jul 26, 2022 at 10:27:19AM +0200, Michal Prívozník wrote:
> On 7/26/22 10:07, Jiatong Shen wrote:
> > thank you very much for reply. I have got another question which is off
> > topic.
> > Am I able to get vm's process id through libvirt api?
> 
> Unfortunately, no. We specifically try to avoid telling users this
> information so that they are not tempted to go behind libvirt's back and
> interact with QEMU directly (which can lead to a split brain scenario -
> libvirt thinks guest is in a certain state, but in fact it's in a
> different state).
> 
> But as I said, it should be fairly easy to extend stats to report when a
> domain was started. If you don't feel comfortable providing a patch for
> that I can try.

Note, the time since a guest was started on the host is NOT the same as
guest uptime. Guest uptime resets on every warm reboot the guest OS
does, while QEMU stays running.

With regards,
Daniel
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