On Tue, 2009-09-29 at 15:20 -0400, Jim Paris wrote:
Nevermind that, my conclusions were bogus. Things still didn't quite add up, so I tracked down what's really going on here:
- Libvirt 0.7.1 (as packaged by Debian) has IFF_VNET_HDR support. - Qemu-kvm 0.11.0 (as built by myself) did NOT include IFF_VNET_HDR support, because it was built against the older headers on my system.
Libvirt assumes that if it can support IFF_VNET_HDR, and qemu is new enough, then qemu must support IFF_VNET_HDR too. This assumption was wrong in my case, but it seems there's no easy way for libvirt to figure out the correct thing to do.
Anyway, after updating the linux-libc-dev package and rebuilding qemu-kvm, things work now.
Yeah, that makes some sense - we have no way of knowing whether qemu was compiled with IFF_VNET_HDR support, all we can do is check that that version of qemu would have support if compiled against headers with IFF_VNET_HDR. Thanks, Mark.