On 10.04.14 12:51, Peter Maydell wrote:
On 10 April 2014 09:58, Antonios Motakis
<a.motakis@xxxxxxxxxxxxxxxxxxxxxx> wrote:
Though in this case, what makes IRQ routing support useful is not any
particular feature it enables, but how it is used as a standard
interface towards in-kernel IRQ chips for KVM. The eventfd support in
KVM makes heavy use of that, so IRQ routing gives us IRQFDs without
having to completely butcher all the eventfd and irqfd code.
I think you should propose a concrete API and give examples
of how userspace would be using it; these abstract discussions
aren't really coming together in my head. Can the kernel
just set up the initial routing mapping as 1:1 so userspace
can ignore the pointless extra level of indirection?
Yes, and it does by default.
Alex
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