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[Qemu-devel] [Bug 1771042] Re: dataplane interrupt handler doesn't suppo
From: |
Max Khon |
Subject: |
[Qemu-devel] [Bug 1771042] Re: dataplane interrupt handler doesn't support msi |
Date: |
Tue, 12 Mar 2019 21:22:31 -0000 |
This bug is invalid. MSI/MSI-X interrupts are properly serviced when
dataplane batching is used. The original problem was in the incorrect
virtio driver initialization sequence (virtqueues and MSI-X interrupts
configured after DRIVER_OK bit is set).
This bug can be closed as INVALID.
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https://bugs.launchpad.net/bugs/1771042
Title:
dataplane interrupt handler doesn't support msi
Status in QEMU:
New
Bug description:
hw/block/dataplane/virtio-blk.c commit
1010cadf62332017648abee0d7a3dc7f2eef9632
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
batching.
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