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.
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