Currently lguest will spend a lot of of time waking up the host, as it
cannot go tickless (if the [host] TSC has been marked unstable). On my
laptop I was getting ~40% of wakeups from lguest.

With this patch applied, my laptop is much happier!
Signed-off-by: NTony Breeds <tony@bakeyournoodle.com>
Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>