higher graphics resolution with KVM ?

[Tomy]

Do you already have a tap1 ?

What are the permissions of /dev/net/tun ?

Yes, tap1 was automagically set up when I started boot-winXP3.sh (really just a command line using kvm-bridge) and was also deleted when I shutdown winXP. As I mentioned above tapX is incremented everytime I start/stop my winXP guest. Actually it is incremented everytime I TRY to start my winXP guest -- in my post above you will see that the first failed attempt as a user shows tap0 and the next successful attempt using sudo creates tap1. I am now up to tap4 because I started/stopped winXP guest several times.

the permissions

# ll /dev/net/
total 0
crw-rw-rw- 1 root root 10, 200 2009-05-04 14:59 tun

[bodhi.zazen]

You can remove old tap with

sudo tunctl -d tap{0,1,2,3,4,5,6}

It also appears your kvm-ifdown script is not running, is it executable ?

did you make a group kvm ?

Can you post boot-winXP3.sh ?

[Tomy]

It also appears your kvm-ifdown script is not running, is it executable ?

# ll /etc/kvm*
-rwxr-xr-x 1 root root  158 2009-06-26 07:19 /etc/kvm-ifdown
-rwxr-xr-x 1 root root  272 2009-06-26 12:46 /etc/kvm-ifup

/etc/kvm:
total 8
-rwxr-xr-x 1 root root  174 2009-04-17 11:10 kvm-ifup
drwxr-xr-x 2 root root 4096 2009-04-21 19:26 utils

Although I get the error message about kvm-ifdown it apparently is running because if I delete it tapX will not get removed.

did you make a group kvm ?

# cat group | grep kvm
kvm:x:124:tomy,root

Can you post boot-winXP3.sh ?

# cat boot-winXP3.sh
#!/bin/sh
kvm-bridge  -soundhw all -vga std \
-hda /winXP/winXP3.img \
-boot c \
-m 512

[bodhi.zazen]

post kvm-bridge also please

[Tomy]

post kvm-bridge also please

This was copied from your blog howto. I changed the NIC model.

# cat /bin/kvm-bridge
#!/usr/bin/env bash
# tap interface automagic allocation
# for linux kernels >= 2.6.18

# modified by bodhi.zazen from :
# http://calamari.reverse-dns.net:980/cgi-bin/moin.cgi/FrequentlyAskedQuestions

# set up a tap interface for qemu/kvm
# USERID – uid qemu is being run under.
USERID=`whoami`

# generate a random mac address for use the virtual nic
# With thanks to pheldens @ qemu forum

ranmac=$(echo -n DE:AD:BE:EF ; for i in `seq 1 2` ; \
do echo -n `echo ":$RANDOM$RANDOM" | cut -n -c -3` ;done)

# specify which NIC to use – see man qemu
model=rtl8139

# The iface variable is automatically set to the next available tap
# Numbering starts with tap0
iface=`sudo tunctl -b -u $USERID`

# start kvm with our parameters
# $@ allows us to add additional command like parameters
# such as -hda $HOME/ubuntu.qcow2
echo “Bringing up interface $iface with mac address $ranmac”
# For Fedora 11 change “kvm” to “qemu-kvm”
kvm -net nic,vlan=0,macaddr=$ranmac,model=$model -net tap,vlan=0,ifname=$iface -usb -usbdevice tablet $@
#

[bodhi.zazen]

I am not seeing anything obvious.

You can try removing -g kvm from your kvm-ifup script and / or running again as root to see where the problem may be.

[Tomy]

I am not seeing anything obvious.

You can try removing -g kvm from your kvm-ifup script and / or running again as root to see where the problem may be.

Okay, thanks very much for the follow-up.

In spite of the error message things work pretty well. I am using gksu to run my script from a menu entry -- so I have to enter my admin password. Not a big deal.

And did I say it works and thank you

Have a great day
Tomy

[bodhi.zazen]

you are welcome. If it runs when running as root the problem is most likely with the

-g kvm

you can test this by changing your primary group (this will be temporary)

newgrp kvm

That command will start a new shell and your primary group will be kvm.

If that works, either remove the -g kvm or change your primary group to kvm.

sudo usermod -g kvm user

you need to log off and back on or start a new log in shell for those changes to take effect

su - user

[Tomy]

Didn't seem to help -- the output looks the same.

$ newgrp kvm
$ kvm-bridge -hda winXP3.img -boot c -m 512
“Bringing up interface tap2 with mac address DE:AD:BE:EF:34:21”
warning: could not open /dev/net/tun: no virtual network emulation
Could not initialize device 'tap'
$ 
$ sudo kvm-bridge -hda winXP3.img -boot c -m 512
[sudo] password for tomy: 
“Bringing up interface tap3 with mac address DE:AD:BE:EF:19:46”
+ [ -n tap3 ]
+ /usr/bin/sudo /usr/sbin/tunctl -u tomy -g kvm -t tap3
TUNSETIFF: Device or resource busy
+ /usr/bin/sudo /sbin/ip link set tap3 up
+ sleep 0.5s
+ /usr/bin/sudo /usr/sbin/brctl addif br0 tap3
+ exit 0
TUNSETIFF: Device or resource busy
/etc/kvm-ifdown: could not launch network script
$

sudo kvm-bridge [options] works fine in spite of the "resource busy" and "could not launch" messages.

________________________________________________
Update: By adding kvm-bridge to /etc/sudoers (using visudo) I no longer have to enter my password. My addition to /etc/sudoers is now:

# Allow members of the kvm group to configure a bridged virtual network interface
%kvm ALL=(ALL) NOPASSWD: /sbin/ifconfig, /usr/sbin/brctl, /usr/sbin/tunctl, /bin/kvm-bridge