Re: resume= kernel cmdline arg by default on servers

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On Thu, 2018-10-18 at 16:21 +0100, Daniel P. Berrangé wrote:
> On Thu, Oct 18, 2018 at 05:16:19PM +0200, Björn Persson wrote:
> > tonynelson@xxxxxxxxxxxxxxxxx wrote:
> > >  Stephen Gallagher said:
> > > >  I can't see anyone putting a Server or Atomic Host into hibernation, though. ...  
> > > 
> > > What happens when the "server" is a (K)VM on a desktop/laptop that is hibernated? I know what I'd want to happen.
> > 
> > When I suspend my Fedora laptop (not hibernate because that doesn't
> > work) with CentOS running in KVM, there is a rather high probability
> > that the VM will enter an infinite loop when resumed.
> 
> That will likely be QEMU trying to inject many hours worth of
> interrupts to the guest. In theory it should eventually fix
> itself, but it can take a very long time to recover - gets worse
> the longer you have been hibernating for too

Happens all the time for me, it is not a good experience.
Isn't there a way to save the instance from the hypervisor *and* on top
of that emulate a quick S3 to the guest so that it will just adjust the
clock w/o causing the VM to lock up ?

Simo.

-- 
Simo Sorce
Sr. Principal Software Engineer
Red Hat, Inc
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