[patch 00/18] pvclock vsyscall support + KVM hypervisor support (v2)

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This patchset, based on earlier work by Jeremy Fitzhardinge, implements
paravirtual clock vsyscall support.

It should be possible to implement Xen support relatively easily.

It reduces clock_gettime from 500 cycles to 200 cycles
on my testbox.

Please review.

>From my POV, this is ready to merge.

v2: 
- Do not allow visibility of different <system_timestamp, tsc_timestamp> 
tuples.
- Add option to disable vsyscall.



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