[Xen-devel] the irq_enter in do_IRQ

["Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx>]

Hi, Keir, in do_IRQ,  why do we call the irq_enter only in __do_IRQ_guest and 
the action->handler(), instead of the whole flow of do_IRQ?

I asked this because we noticed a bug that the map/unmap_domain_page() is 
called in a interrupt handler's ack() method, which is not guarded by 
irq_enter(), thus the "ASSERT(!in_irq())" in map/unmap_domain_page() is not 
work expected to guard this calling.

Thanks
--jyh

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