Re: [Xen-devel] do_iret bug in xen

[Andres Lagar-Cavilla <andreslc@xxxxxxxxxxxxxx>]

raise_softirq is not the same as actually doing it. Raise only sets a 
bit indicating pending softirq. Before returning to the guest, the bin 
triggers actual execution of the softirq
Andres

   since "sti" is on, an interrupt can occur which can cause the
   control to enter "__runq_tickle", which then invokes
   "cpumask_raise_softirq(mask, SCHEDULE_SOFTIRQ)" to send IPI to a
   processor causing the control to enter "__enter_scheduler" which
   changes the current. 


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