On 23.09.2015 15:03, Jérôme wrote:
Hi all.
When resuming guest after suspend, the time is wrong (because the guest doesn't know it has been suspended).
Apparently, ntp running on the guest doesn't solve this. At least on Linux system. I read it works on Windows guests. I don't understand why, so I'd appreciate a link to an explanation, but I understand it is out of scope for this list.
The HW clock is correct and the guest agent is setup to use kvm-clock.
Using the guest-set-time command does set the clock on the guest according to the host. But this is not triggered automatically on resume.
I found discussions about this, even a patch proposal to call guest-set-time on resume, but all of this is one year old and I can't find any newer information.
http://serverfault.com/questions/334698/how-to-keep-time-on-resumed-kvm-gues... https://www.redhat.com/archives/libvirt-users/2014-October/msg00009.html https://www.redhat.com/archives/libvir-list/2014-February/msg00520.html
Is there any fresher information I have missed ?
You can use "virsh resume $dom && virsh domtime --sync $dom" which will resume and resync the domain's clock from domain RTC. There were some attempts to wrap these into a single API, however, I was persuaded that it's a wrong idea. Wrapping two distinct operations into a single API is always wrong. Michal