On 13/12/11 21:23, Sasha Levin wrote: > On Tue, 2011-12-13 at 18:00 +1100, Matt Evans wrote: >> The second patch is a small fix for generic virtio code (now that we have a >> PPC build) which removes reliance on ioeventfds for PPC, which doesn't provide >> them. > > Hm... ioeventfds are located in the generic code and should be available > on all archs (it doesn't use any arch specific code at all afaik). > > Why don't they work on ppc? > Well, there are two problems: you're right that it's generic code, but it's configurable and CONFIG_HAVE_KVM_EVENTFD isn't set for PPC KVM (thus the ioctl fails). That's probably off because ioevents won't work anyway-- the in-kernel MMIO exit route isn't wired up to kvm_io_bus_read/write() yet. (It looks like KVM_IRQFD will also fail, which virtio-pci /would/ use if I supported MSIs, which I currently don't.) Yes, this can be fixed, but relying on it means that virtio on kvmtool/PPC won't work on today's kernels. :( Cheers, Matt -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
