Re: [PATCH 0/5 V5] Avoid soft lockup message when KVM is stoppedby host

[Anthony Liguori]

On 12/14/2011 08:39 AM, Avi Kivity wrote:
> On 12/14/2011 02:16 PM, Marcelo Tosatti wrote:
> > > Having this controlled from userspace means it doesn't work for SIGSTOP
> > > or for long scheduling delays.  What about doing this automatically
> > > based on preempt notifiers?
> >
> > Long scheduling delays should be considered hangups from the guest
> > perspective.
>
> Why?  To the guest it looks like slow hardware, but it will interpret it
> as a softlockup.
>
> > About SIGSTOP, that is a corner case. Unsure if its even properly supported
> > by QEMU.
>
> It works from my experience.

We don't adjust vm_clock's offset on SIGSTOP/SIGCONT so while it may appear to 
work okay, QEMU isn't exhibiting the behavior it is supposed to.

Regards,

Anthony Liguori

>

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