Time sync in KVM Guest

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Hi all,

We are working on Fedora 15 Host. And the KVM is used to create Fedora 14 guest.
The clock-source details are as below.

Our Host supports constant_tsc.

on HOST OS
cat /sys/devices/system/clocksource/clocksource0/current_clocksource
tsc

on GUEST OS
cat /sys/devices/system/clocksource/clocksource0/current_clocksource
kvm-clock

We are not having Wall-clock time Sync in Both Host and guest.
The Time in Host OS lags behind guest by atleast 2 seconds.
However, this time difference remains constant.
Does this mean that the Host and Guest clocks are synchronized ?
By using kvm-clock as clock source on the guest, the time sync should happen itself ?
Please correct me if I am wrong...
How exactly we can find the time difference between Host and guest?

Thanks in advance.



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