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RFC virtio-pci: polling mode support

Michael S. Tsirkin qemu-devel virtualization 1 version In review

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  1. v1 RFC Latest2 patches 5 repliesIn review

Patches in v1 No applies recorded yet

#Subject and filesSizeRepliesApplied
1/2virtio: ISR bit constantshw/virtio.c hw/virtio.h+9 -30 replies
2/2virtio-pci: recall and return msix notifications on ISR readhw/msix.c hw/msix.h hw/virtio-pci.c+39 -13 replies

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Cover letter [Qemu-devel] [PATCH RFC 0/2] virtio-pci: polling mode support

MSIX spec requires that device can be operated with all vectors masked, by polling.

So the following patchset (lightly tested) adds this
ability: when driver reads ISR, the device recalls a pending notification, and returns pending status in the ISR register.

The polling driver can operate as follows:
- map all VQs and config to the same vector
- poll ISR to get status - this also flushes VQ updates to memory
- handle config change or VQ event depending on ISR

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Signature · 1 line
1.7.5.53.gc233e

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