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xen-devel
Re: [Xen-devel] Interrupt forwarding
On 12 Mar 2005, at 18:33, Jon Smirl wrote:
Shared interrupts are slightly worse because the irq won't get
unmasked
until all receivers say their work is done. If one lock sup it starves
the rest -- until this is detected and that domain gets blown away.
After you blow away the domain how do you acknowledge the interrupt?
Is all hardware required to have a tiny driver in the supervisor to
handling acking in this case? If you don't ack it, it is going to keep
interrupting.
We don't go that far. A sensible approach would be to require the
driver to be restarted, and to reset the hardware device, before
unmasking. Or to rate limit each interrupt line to an
administrator-configurable 'reasonable' number of IRQs per second --
this might also catch bugs where drivers are not properly acking
devices for other reasons.
-- Keir
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