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    SubjectRe: [PATCH 4/4][RFC] kvm: eoi_eventfd
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    On Sun, 2012-06-24 at 15:56 +0300, Avi Kivity wrote:
    > On 06/23/2012 01:16 AM, Alex Williamson wrote:
    > > I think we're probably also going to need something like this.
    > > When running in non-accelerated qemu, we're going to have to
    > > create some kind of EOI notifier for drivers. VFIO can make
    > > additional improvements when running on KVM so it will probably
    > > make use of the KVM_IRQFD_LEVEL_EOI interface, but we don't
    > > want to have a generic EOI notifier in qemu that just stops
    > > working when kvm-ioapic is enabled.
    >
    > Why?

    Hmm, I must be missing something or not describing it correctly, because
    it seems obvious. If we create a dependency in qemu of needing to know
    when an eoi occurs and notifier a driver and have no way to fulfill that
    dependency when running on kvm... that'd be bad, right? I don't want to
    assume that every consumer of such an interface would prefer to make use
    of an irqfd. Not sure if that answers your question though. Thanks,

    Alex



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