On Sun, Aug 09, 2009 at 05:56:30PM +0300, Avi Kivity wrote:
> On 08/09/2009 03:41 PM, Gleb Natapov wrote:
> >Sending of MSI using IRQ routing is an artificial concept and potentially
> >big number of MSIs (2048 per device) make it also inefficient. This
> >patch adds an interface to inject MSI messages from userspace to lapic
> >logic directly. The patch also reduces the maximum number of IRQ routing
> >entries to 128 since MSIs will no longer go there and 128 entries cover
> >5 ioapics and this ought to be enough for anybody.
>
> In the future many MSIs will be triggered via irqfds, and those
> require irq routing.
>
Why? My plan is to change irqfd to use the MSI functions.
--
Gleb.
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