soft lockup detector & virtualisation

[Dave Jones]

Lately I've noticed quite a few soft lockup bugs being reported.
In many of them, they're coming from inside virtual guests.

Is the softlockup detector fundamentally broken in this situation ?

If the host doesn't schedule the guest for whatever reason,
or the user suspends the VM and resumes it later ?

Here's the most recent example:
https://bugzilla.redhat.com/attachment.cgi?id=563767

In many of these, the code where it's "stuck" isn't anything
special, which is why I think the guest just hasn't had a
timeslice in 185 seconds.

Is there some way we can perhaps detect we're running virtualised,
and disable the detector automatically ?

thoughts ?

	Dave

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