With the latest upstream qemu-kvm git tree, all the offloads are disabled on virtio-net. peer_has_vnet_hdr(n) in virtio_net_get_features() is failing because n->vc->peer is NULL. Could not figure out yet why peer field is not initialized. Do i need any new options to be specified with qemu command? qemu-system-x86_64 -m 1024 -kernel /boot/vmlinuz-2.6.32-guest -append 'root=/dev/vda1 console=tty0 console=ttyS0,115200' -initrd /boot/initrd-2.6.32-guest.img -drive file=/kvm_images/fedora10-2-vm,if=virtio,index=0 -net nic,macaddr=54:52:00:35:e3:74,model=virtio -net tap,ifname=vnet1,script=no,downscript=no Works fine with qemu-kvm-0.11.0 and i see checksum/tso/gso are enabled on guest virtio-net device. Thanks Sridhar -- 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