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xen-devel
[Xen-devel] Re: the irq_enter in do_IRQ
On 18/09/2010 03:22, "Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx> wrote:
> 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.
Okay, xen-unstable:22175 fixes do_IRQ() to be better covered by
irq_enter()/irq_exit(). Xen-unstable:22177 fixes
map_domain_page()/unmap_domain_page() to be IRQ safe.
If these work okay for you then they are candidates for backport for 4.0.2.
-- Keir
> Thanks
> --jyh
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