What's kvmclock's custom sched_clock for?

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AFAICT KVM reliably passes a monotonic TSC through to guests, even if
the host suspends.  That's all that sched_clock needs, I think.

So why does kvmclock have a custom sched_clock?

On a related note, KVM doesn't pass the "invariant TSC" feature
through to guests on my machine even though "invtsc" is set in QEMU
and the kernel host code appears to support it.  What gives?

--Andy
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