[XEN][POWERPC] workaround for context_switch() bug

[XEN][POWERPC] workaround for context_switch() bug
 We have a bug in that if we switch domains in schedule() we switch
 right away regardless of whatever else is pending.  This means that
 if the timer goes off while in schedule(), the next domain will be
 preempted by the interval defined below.  So until we fix our
 cotnext_switch(), the follow workaround will make sure that the
 domain we switch to does not run for to long so we can continue to
 service the other timers in the timer queue and that the value is
 long enough to escape this particular timer event.
Signed-off-by: Jimi Xenidis <jimix@watson.ibm.com>
Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
--HG--
extra : transplant_source : j%F6%01%C5%EB%E1%92%A0%DErC%0C%DD%94%DA%5B%A4o%F2%87