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    SubjectRe: [KVM PATCH 1/2] KVM: Directly inject interrupts via irqfd
    On 10/21/2009 05:42 PM, Gregory Haskins wrote:
    > I believe Avi, Michael, et. al. were in agreement with me on that design
    > choice. I believe the reason is that there is no good way to do EOI/ACK
    > feedback within the constraints of an eventfd pipe which would be
    > required for the legacy pin-type interrupts. Therefore, we won't even
    > bother trying. High-performance subsystems will use irqfd/msi, and
    > legacy emulation can use the existing injection code (which includes the
    > necessary feedback for ack/eoi).
    >
    >

    Right. But we don't actually prevent anyone using non-msi with irqfd,
    which can trigger the bad lock usage from irq context, with a nice boom
    afterwards. So we need to either prevent it during registration, or to
    gracefully handle it afterwards.

    --
    error compiling committee.c: too many arguments to function



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