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0e1f616
(Get the code!)
I have what seems to be an identical issue.
I can confirm that a reboot of the XP SP3 guest OS /does/ return the networking to operation - at the expense of making live migration a bit of a pointless exercise since the intention is to avoid the reboot and keep things running seamlessly.
The identical cluster migrating a Linux VM works properly - there is no interruption to operation. NeatX/NoMachine sessions continue to operate and no pings are lost.
Right now, this seems to affect XP SP3. I've tried it with and without the virtio network driver but the result is identical.
My systems are AMD64 quad core CPUs - both servers are identical in all hardware.
A tcpdump shows the XP guest sends out packets, these are forwarded over the bridge and the reply packets also come back onto the guest vnet0 device but the guest does not see them. e.g. a tcpdump shows the ping request and the reply packet but the guest itself does not receive the reply packet even though tcpdump shows it is there.