Re: [Qemu-discuss] Defining a bridge

[Jerry Stuckle]

Alexsei and all,

Well, I screwed up and responded to Aleksei directly instead of to the
list.  I really do appreciate his help; he's a lot more knowledgeable
than I am in this area.  In an attempt to catch up on this, here's
what's happened.

I tried loading virtio_net module; it also loaded the virtio and
virtio_ring modules, but no luck.  Still no device in Debian.  Aleksei
also recommended trying to load the virtio_mmio, but it does not exist
on my system.

My /etc/network/interfaces file contains the default:

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
allow-hotplug eth0
iface eth0 inet dhcp


Again, this setup is: Windows 7 as the base OS with two nics, wired and
wireless (only one active at a time).  Under this I have Oracle Virtual
Machine running Ubuntu 4.4.0-38-generic (latest stable release).  I have
set up a bridge in Ubuntu's Network Manager as described on
http://ask.xmodulo.com/configure-linux-bridge-network-manager-ubuntu.html.
 The bridge is defined as "bridge0" and works correctly in Ubuntu.

I start QEMU under Ubuntu with:

qemu-system-arm -m 1024M \
        -sd /export/armhf.qcow2 \
        -M vexpress-a9 \
        -cpu cortex-a9 \
        -kernel /export/boot/vmlinuz \
        -initrd /export/boot/initrd.img \
        -append "root=/dev/mmcblk0p2" \
        -device virtio-net-device,netdev=net0 \
        -netdev 
bridge,br=bridge0,id=net0,helper=/usr/lib/qemu/qemu-bridge-helper

Guest system is Debian 3.2.0-4-vexpress, again the latest stable
version.  I get a SLIRP connection just fine when I don't specify the
-device and -netdev parameters.  The "lshw" shows the driver to be
smsc911x, but I don't know how to relate that to which NIC is being
emulated (it at least works).

When I do specify the -device and -netdev parameters, I get no network.
The log shows nothing unusual other than no network device is found.

I'm also going to ask in the qemu-arm forum, just in case there's a
known problem there.  But I would appreciate any other help and ideas
from Aleksei and others.  Hopefully this catch-up will jog someone's memory.

Thanks again for everyone's help, especially Aleksei.

Jerry