[PATCH 0/3] KVM clock, new iteration

[Glauber de Oliveira Costa <gcosta-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>]

Hi folks,

A lot of time has been elapsed since I last sent a version of kvm clock,
with a lot of things in the middle, including my vacations and a nasty bug
in the clock itself ;-)

Here it is a new version. I'm following avi's last suggestion of using an msr
to make it more migration-proof. If it's not approved, we can easily switch back
to the hypercall mechanism. That's the easy part ;-)

Clock updates are done every time we're scheduled. It is _not_ enough to check
if we're changing cpus, because the tsc will change its frequency when the cpu is
idle (if using the mwait idle). So after a long idle period, one cpu will end up stepping
ahead causing a backward time (remember the bug I talked about? :-) )

As I fell it ready for inclusion (which obviously does not mean it is perfect, nor that
I don't value any further comments ), I'm also posting the userspace patches in a separate
series that will follow shortly.



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