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[Qemu-devel] [Bug 1771042] Re: dataplane interrupt handler doesn't suppo
[Qemu-devel] [Bug 1771042] Re: dataplane interrupt handler doesn't support msi
Mon, 14 May 2018 03:48:46 -0000
oh right, another note. this only manifests when using kvm.
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dataplane interrupt handler doesn't support msi
Status in QEMU:
in the function notify_guest_bh, the function virtio_notify_irqfd is called
to deliver the interrupt corresponding to the vq
however, without the dataplane, hw/block/virtio_blk_req_complete calls
virtio_notify to deliver the interrupt (immediately). this goes though
a slightly more involved path that calls virtio_pci_notify which includes
a case to handle msi interrupts.
so, msi interrupts with block devices aren't serviced when using dataplane
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