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[Xen-devel] [PATCH 0/4] x86/hvm: RTC periodic timer adjustments

With these four patches, the time drift that was happening on Windows XP
guests goes away, at least in my testing.  4/4 is probably the most
important (with the other three, I still see slow drift), but the others
all seem like a good idea to me. 

1/4 is just a bit of tidying, untangling the IRQ masking logic.
2/4 is the same patch I posted before, to keep the periods aligned.
3/4 avoids calling create_periodic_time() when it's already running.
4/4 holds off disabling the timer for a few ticks, while still
    disabling it if the guest is obviously ignoring the IRQ.



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