Gregory Haskins wrote:
I'll just add that you could tie the irqfd to an iosignalfd to eliminate the involvement of qemu on either side as well. I'm not sure if that really works with the design of this particular device (e.g. perhaps qemu is needed for other reasons besides signaling), but it is a neat demonstration of the flexibility of the newly emerging kvm-eventfd interfaces.
If we have an iosignalfd for point-to-point (say, a pio port with the guest ID) we can do direct guest-to-guest signalling. For broadcast or multicast, we need to exit to qemu to handle the loop.
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