On Mon, Aug 13, 2012 at 12:43:50PM +0300, Avi Kivity wrote: > On 08/13/2012 12:16 PM, Gleb Natapov wrote: > > Here is a quick prototype of what we discussed yesterday. This one > > caches only MSI interrupts for now. The obvious problem is that not > > all interrupts (namely IPIs and MSIs using KVM_CAP_SIGNAL_MSI) use irq > > routing table, so they cannot be cached. > > Missing: switch the uncached path to a work queue, so we don't have to > iterate over all vcpus in interrupt context. > > That isn't trivial; for edge-triggered interrupts we need to ignore > zeros (if polarity=0) but for level-triggered interrupts we need them to > override the previous setting. But we don't know the trigger mode and > polarity at this point. > Looked at it and I think we have enough info about trigger mode and polarity at the point where cache is checked, but we can't switch to a work queue there because some callers want to get injection state and this requires injection to be synchronous. Only high level caller knows if work queue is OK or not. -- Gleb. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
