Re: [Xen-devel] Interrupt forwarding

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

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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