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

[Michael S. Tsirkin]

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

Comments?

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1.7.5.53.gc233e