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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