Re: [KVM timekeeping 10/35] Fix deep C-state TSC desynchronization

[Jan Kiszka]

Am 15.09.2010 14:32, Glauber Costa wrote:
> On Wed, Sep 15, 2010 at 10:09:33AM +0200, Jan Kiszka wrote:
>>> In any case, I'll proceed with the forcing of unstable TSC and HPET
>>> clocksource and see what happens.
>>
>> I tried that before, but it did not trigger the issue that kvm-clock
>> guests no longer boot properly. This only happens if the TSC is marked
>> unstable.
> 
> even artificially marked unstable ?
> 

Yes. As soon as I hack tsc_unstable to 1, things go wrong. When I hack
it back to 0, guest that wants kvm-clock boots again and seem to run fine.

This is issue #2, I guess. Issue #2 remains that the TSC is marked
unstable. I have the feeling that this is bogus, maybe due to lacking
suspend/resume awareness? The tsc clocksource does

	clocksource_tsc.cycle_last = 0;

on resume...

Jan

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