Re: [kvm-devel] [PATCH 3/3] virtio PCI device

Carsten Otte
2007-11-27T09:10:31Z

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.