Just a heads-up for now, no real diagnostics or anything like that.
Current git master (a9c87c586ba9ee290792a98dc126b2861b7f8b03), when booted a windows guest, results in no virtio-net inside. Neither winXP nor Win7, neither older nor latest (22 Jan 2013) virtio-net drivers works. Windows displays a yellow exclamation mark near the virtio-net device and says it can't start the device (Code 10). Linux guests work fine, quick test anyway. Cc'ing Jason since his virtio-net changes was last. But I repeat: no diagnostics as of yet, no bisection. Just a heads-up. Thanks, /mjt