Avi Kivity wrote:
No, definitely not define a hypercall ABI. The feature bit should say "this device understands a hypervisor-specific way of kicking. consult your hypervisor manual and cpuid bits for further details. should you not be satisfied with this method, port io is still available".
...unless you're lucky enough to be on s390 where pio is not available.I don't see why we'd have two different ways to talk to a virtio device. I think we should use a hypercall for interrupt injection, without support for grumpy old soldered pci features other than HPA-style Lguest PCI bus organization. There are no devices that we want to be backward compatible with.
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