November 2010 - Users - libvirt List Archives

[libvirt-users] (no subject)
by David M. Barlieb 17 Nov '10

17 Nov '10

HI, I've just begun using libvirt as part of my KVM installation and have been having some confusion regarding networking of my virtual guests. I'm not sure if I should even be sending this to this mailing list and if not please let me know and if possible where I should be sending this inquiry. I understand I can setup a dedicated bridged interface for my guest. But as for the virbr interface which is the default, I'm a little confused about. When using this, does the guest os use the same ip as the host? If so, then how to packets get to the guest instead of the host. I would guess there's an alternate mac address for the guest interface and this is how it gets there but am not certain. Sorry if this seems like a simple question but I'm not very well versed in networking. daveb

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[libvirt-users] java binding and virtualbox-ose
by Andrea Turli 15 Nov '10

15 Nov '10

I'm trying to connect to vbox hypervisor on an Ubuntu 10.04 machine through libvirt java binding (libvirt-java-0.4.6) by simply invoking: Connect conn = new Connect("vbox:///session", false); but I got this exception: libvir: warning : Failed to find the interface: Is the daemon running ? libvir: Remote error : unable to connect to '/var/run/libvirt/libvirt-sock': Connection refused libvir: warning : Failed to find a node driver: Is the libvirtd daemon running ? libvir: Remote error : unable to connect to '/var/run/libvirt/libvirt-sock': Connection refused libvir: warning : Failed to find a secret storage driver: Is the daemon running ? org.libvirt.LibvirtException: Failed to find a secret storage driver: Is the daemon running ? at org.libvirt.ErrorHandler.processError(ErrorHandler.java:28) at org.libvirt.Connect.<init>(Connect.java:195) at VBOX.main(VBOX.java:32) Otherwise, from virsh, I can correctly connect to the vbox hypervisor: $ export LIBVIRT_DEBUG=1 $virsh -c vbox:///session list --all 11:37:18.318: debug : virInitialize:336 : register drivers 11:37:18.318: debug : virRegisterDriver:837 : registering Test as driver 0 11:37:18.318: debug : virRegisterNetworkDriver:675 : registering Test as network driver 0 11:37:18.318: debug : virRegisterInterfaceDriver:706 : registering Test as interface driver 0 11:37:18.318: debug : virRegisterStorageDriver:737 : registering Test as storage driver 0 11:37:18.318: debug : virRegisterDeviceMonitor:768 : registering Test as device driver 0 11:37:18.318: debug : virRegisterSecretDriver:799 : registering Test as secret driver 0 11:37:18.318: debug : virRegisterDriver:837 : registering Xen as driver 1 11:37:18.318: debug : virRegisterDriver:837 : registering OPENVZ as driver 2 11:37:18.336: debug : vboxRegister:83 : VBoxCGlueInit found API version: 3.1.6 (3001006) 11:37:18.336: debug : vboxRegister:100 : VirtualBox API version: 3.1 11:37:18.336: debug : virRegisterDriver:837 : registering VBOX as driver 3 11:37:18.336: debug : virRegisterNetworkDriver:675 : registering VBOX as network driver 1 11:37:18.336: debug : virRegisterStorageDriver:737 : registering VBOX as storage driver 1 11:37:18.336: debug : virRegisterDriver:837 : registering remote as driver 4 11:37:18.336: debug : virRegisterNetworkDriver:675 : registering remote as network driver 2 11:37:18.336: debug : virRegisterInterfaceDriver:706 : registering remote as interface driver 1 11:37:18.336: debug : virRegisterStorageDriver:737 : registering remote as storage driver 2 11:37:18.336: debug : virRegisterDeviceMonitor:768 : registering remote as device driver 1 11:37:18.336: debug : virRegisterSecretDriver:799 : registering remote as secret driver 1 11:37:18.336: debug : virConnectOpenAuth:1337 : name=vbox:///session, auth=0x231638, flags=0 11:37:18.336: debug : do_open:1106 : name "vbox:///session" to URI components: scheme vbox opaque (null) authority (null) server (null) user (null) port 0 path /session 11:37:18.336: debug : do_open:1116 : trying driver 0 (Test) ... 11:37:18.336: debug : do_open:1122 : driver 0 Test returned DECLINED 11:37:18.336: debug : do_open:1116 : trying driver 1 (Xen) ... 11:37:18.336: debug : do_open:1122 : driver 1 Xen returned DECLINED 11:37:18.336: debug : do_open:1116 : trying driver 2 (OPENVZ) ... 11:37:18.336: debug : do_open:1122 : driver 2 OPENVZ returned DECLINED 11:37:18.336: debug : do_open:1116 : trying driver 3 (VBOX) ... 11:37:18.589: debug : vboxOpen:836 : in vboxOpen 11:37:18.589: debug : do_open:1122 : driver 3 VBOX returned SUCCESS 11:37:18.589: debug : do_open:1142 : network driver 0 Test returned DECLINED 11:37:18.589: debug : vboxNetworkOpen:5439 : network initialized 11:37:18.589: debug : do_open:1142 : network driver 1 VBOX returned SUCCESS 11:37:18.589: debug : do_open:1161 : interface driver 0 Test returned DECLINED 11:37:18.589: debug : doRemoteOpen:564 : proceeding with name = vbox:///session 11:37:18.590: debug : remoteIO:8455 : Do proc=66 serial=0 length=28 wait=(nil) 11:37:18.590: debug : remoteIO:8517 : We have the buck 66 0xb7516008 0xb7516008 11:37:18.595: debug : remoteIODecodeMessageLength:7939 : Got length, now need 64 total (60 more) 11:37:18.595: debug : remoteIOEventLoop:8381 : Giving up the buck 66 0xb7516008 (nil) 11:37:18.595: debug : remoteIO:8548 : All done with our call 66 (nil) 0xb7516008 11:37:18.596: debug : remoteIO:8455 : Do proc=1 serial=1 length=56 wait=(nil) 11:37:18.596: debug : remoteIO:8517 : We have the buck 1 0x95eb908 0x95eb908 11:37:18.659: debug : remoteIOEventLoop:8402 : Giving up the buck due to I/O error 1 0x95eb908 (nil) 11:37:18.660: debug : do_open:1161 : interface driver 1 remote returned ERROR 11:37:18.660: debug : do_open:1181 : storage driver 0 Test returned DECLINED 11:37:18.660: debug : vboxStorageOpen:6191 : vbox storage initialized 11:37:18.660: debug : do_open:1181 : storage driver 1 VBOX returned SUCCESS 11:37:18.660: debug : do_open:1201 : node driver 0 Test returned DECLINED 11:37:18.660: debug : doRemoteOpen:564 : proceeding with name = vbox:///session 11:37:18.661: debug : do_open:1201 : node driver 1 remote returned ERROR 11:37:18.661: debug : do_open:1228 : secret driver 0 Test returned DECLINED 11:37:18.661: debug : doRemoteOpen:564 : proceeding with name = vbox:///session 11:37:18.661: debug : do_open:1228 : secret driver 1 remote returned ERROR 11:37:18.661: debug : virConnectNumOfDomains:1714 : conn=0x95a1910 11:37:18.663: debug : virConnectNumOfDefinedDomains:4554 : conn=0x95a1910 11:37:18.664: debug : virConnectListDefinedDomains:4593 : conn=0x95a1910, names=0x95e9b58, maxnames=1 Id Name State ---------------------------------- 11:37:18.666: debug : virDomainLookupByName:1974 : conn=0x95a1910, name=tty 11:37:18.669: debug : virGetDomain:345 : New hash entry 0x95dad48 11:37:18.669: debug : virDomainGetInfo:2825 : domain=0x95dad48, info=0xbfeca708 - tty shut off 11:37:18.673: debug : virDomainFree:2062 : domain=0x95dad48 11:37:18.673: debug : virUnrefDomain:422 : unref domain 0x95dad48 tty 1 11:37:18.673: debug : virReleaseDomain:376 : release domain 0x95dad48 tty 11:37:18.673: debug : virReleaseDomain:392 : unref connection 0x95a1910 2 11:37:18.673: debug : virConnectClose:1355 : conn=0x95a1910 11:37:18.673: debug : virUnrefConnect:259 : unref connection 0x95a1910 1 11:37:18.673: debug : vboxNetworkClose:5448 : network uninitialized 11:37:18.673: debug : vboxStorageClose:6200 : vbox storage uninitialized 11:37:18.673: debug : vboxClose:843 : VBOX: in vboxClose 11:37:18.681: debug : virReleaseConnect:216 : release connection 0x95a1910 even if with some warnings/errors. Do you have any hint? Thank you -- Andrea Turli Ricercatore Direzione Ricerca e Innovazione andrea.turli(a)eng.it Engineering Ingegneria Informatica spa Via Riccardo Morandi, 32 00148 Roma (RM) Tel. +39 06 8307 4710 Fax +39 06 8307 4200 www.eng.it

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[libvirt-users] ESX(i) implemented functions
by Sherif Nagy 14 Nov '10

14 Nov '10

Dear All, I would like to know what functions and classes are implemented in the ESX(i) driver ? i am trying to use virsh to retrieve some simple information such as vcpuinfo domain, but it is not working, so I would like to know what functions are implemented in libvirt ESX(i) driver. Also i checked the http://libvirt.org/drvesx.html and nothing is mentioned there. Thank You, Regards, Sherif

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[libvirt-users] libvirtio version compatibility...
by Erik Brakkee 14 Nov '10

14 Nov '10

Hi, I intend to run a server with about 4 VMs with KVM and would like to use virtio for performance. However, one thing that is holding me back is compatibility. In the past I have seen with Xen that the paravirtualized drivers of one version in the host (dom0) would not always be compatible with a version in the client. If I would run into compatibility problems than I would like to continue to use full virtualization despite the performance impact. Therefore my question. In case I am running a setup with a host and a number of domains, is it guaranteed that I can do the following: * upgrade the host independent of the guests * upgrade a guest independent of the host Cheers Erik -- Nonsense and other useful things: http://brakkee.org MountainHoppers: http://mountainhoppers.nl Track Detective: http://trackdetective.com Twitter: http://twitter.com/ErikBrakkee

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[libvirt-users] java binding and virtualbox-ose
by Andrea Turli 14 Nov '10

14 Nov '10

I'm trying to connect to vbox hypervisor on an Ubuntu 10.04 machine through libvirt java binding (libvirt-java-0.4.6) by simply invoking: Connect conn = new Connect("vbox:///session", false); but I got this exception: libvir: warning : Failed to find the interface: Is the daemon running ? libvir: Remote error : unable to connect to '/var/run/libvirt/libvirt-sock': Connection refused libvir: warning : Failed to find a node driver: Is the libvirtd daemon running ? libvir: Remote error : unable to connect to '/var/run/libvirt/libvirt-sock': Connection refused libvir: warning : Failed to find a secret storage driver: Is the daemon running ? org.libvirt.LibvirtException: Failed to find a secret storage driver: Is the daemon running ? at org.libvirt.ErrorHandler.processError(ErrorHandler.java:28) at org.libvirt.Connect.<init>(Connect.java:195) at VBOX.main(VBOX.java:32) Otherwise, from virsh, I can correctly connect to the vbox hypervisor: $ export LIBVIRT_DEBUG=1 $virsh -c vbox:///session list --all 11:37:18.318: debug : virInitialize:336 : register drivers 11:37:18.318: debug : virRegisterDriver:837 : registering Test as driver 0 11:37:18.318: debug : virRegisterNetworkDriver:675 : registering Test as network driver 0 11:37:18.318: debug : virRegisterInterfaceDriver:706 : registering Test as interface driver 0 11:37:18.318: debug : virRegisterStorageDriver:737 : registering Test as storage driver 0 11:37:18.318: debug : virRegisterDeviceMonitor:768 : registering Test as device driver 0 11:37:18.318: debug : virRegisterSecretDriver:799 : registering Test as secret driver 0 11:37:18.318: debug : virRegisterDriver:837 : registering Xen as driver 1 11:37:18.318: debug : virRegisterDriver:837 : registering OPENVZ as driver 2 11:37:18.336: debug : vboxRegister:83 : VBoxCGlueInit found API version: 3.1.6 (3001006) 11:37:18.336: debug : vboxRegister:100 : VirtualBox API version: 3.1 11:37:18.336: debug : virRegisterDriver:837 : registering VBOX as driver 3 11:37:18.336: debug : virRegisterNetworkDriver:675 : registering VBOX as network driver 1 11:37:18.336: debug : virRegisterStorageDriver:737 : registering VBOX as storage driver 1 11:37:18.336: debug : virRegisterDriver:837 : registering remote as driver 4 11:37:18.336: debug : virRegisterNetworkDriver:675 : registering remote as network driver 2 11:37:18.336: debug : virRegisterInterfaceDriver:706 : registering remote as interface driver 1 11:37:18.336: debug : virRegisterStorageDriver:737 : registering remote as storage driver 2 11:37:18.336: debug : virRegisterDeviceMonitor:768 : registering remote as device driver 1 11:37:18.336: debug : virRegisterSecretDriver:799 : registering remote as secret driver 1 11:37:18.336: debug : virConnectOpenAuth:1337 : name=vbox:///session, auth=0x231638, flags=0 11:37:18.336: debug : do_open:1106 : name "vbox:///session" to URI components: scheme vbox opaque (null) authority (null) server (null) user (null) port 0 path /session 11:37:18.336: debug : do_open:1116 : trying driver 0 (Test) ... 11:37:18.336: debug : do_open:1122 : driver 0 Test returned DECLINED 11:37:18.336: debug : do_open:1116 : trying driver 1 (Xen) ... 11:37:18.336: debug : do_open:1122 : driver 1 Xen returned DECLINED 11:37:18.336: debug : do_open:1116 : trying driver 2 (OPENVZ) ... 11:37:18.336: debug : do_open:1122 : driver 2 OPENVZ returned DECLINED 11:37:18.336: debug : do_open:1116 : trying driver 3 (VBOX) ... 11:37:18.589: debug : vboxOpen:836 : in vboxOpen 11:37:18.589: debug : do_open:1122 : driver 3 VBOX returned SUCCESS 11:37:18.589: debug : do_open:1142 : network driver 0 Test returned DECLINED 11:37:18.589: debug : vboxNetworkOpen:5439 : network initialized 11:37:18.589: debug : do_open:1142 : network driver 1 VBOX returned SUCCESS 11:37:18.589: debug : do_open:1161 : interface driver 0 Test returned DECLINED 11:37:18.589: debug : doRemoteOpen:564 : proceeding with name = vbox:///session 11:37:18.590: debug : remoteIO:8455 : Do proc=66 serial=0 length=28 wait=(nil) 11:37:18.590: debug : remoteIO:8517 : We have the buck 66 0xb7516008 0xb7516008 11:37:18.595: debug : remoteIODecodeMessageLength:7939 : Got length, now need 64 total (60 more) 11:37:18.595: debug : remoteIOEventLoop:8381 : Giving up the buck 66 0xb7516008 (nil) 11:37:18.595: debug : remoteIO:8548 : All done with our call 66 (nil) 0xb7516008 11:37:18.596: debug : remoteIO:8455 : Do proc=1 serial=1 length=56 wait=(nil) 11:37:18.596: debug : remoteIO:8517 : We have the buck 1 0x95eb908 0x95eb908 11:37:18.659: debug : remoteIOEventLoop:8402 : Giving up the buck due to I/O error 1 0x95eb908 (nil) 11:37:18.660: debug : do_open:1161 : interface driver 1 remote returned ERROR 11:37:18.660: debug : do_open:1181 : storage driver 0 Test returned DECLINED 11:37:18.660: debug : vboxStorageOpen:6191 : vbox storage initialized 11:37:18.660: debug : do_open:1181 : storage driver 1 VBOX returned SUCCESS 11:37:18.660: debug : do_open:1201 : node driver 0 Test returned DECLINED 11:37:18.660: debug : doRemoteOpen:564 : proceeding with name = vbox:///session 11:37:18.661: debug : do_open:1201 : node driver 1 remote returned ERROR 11:37:18.661: debug : do_open:1228 : secret driver 0 Test returned DECLINED 11:37:18.661: debug : doRemoteOpen:564 : proceeding with name = vbox:///session 11:37:18.661: debug : do_open:1228 : secret driver 1 remote returned ERROR 11:37:18.661: debug : virConnectNumOfDomains:1714 : conn=0x95a1910 11:37:18.663: debug : virConnectNumOfDefinedDomains:4554 : conn=0x95a1910 11:37:18.664: debug : virConnectListDefinedDomains:4593 : conn=0x95a1910, names=0x95e9b58, maxnames=1 Id Name State ---------------------------------- 11:37:18.666: debug : virDomainLookupByName:1974 : conn=0x95a1910, name=tty 11:37:18.669: debug : virGetDomain:345 : New hash entry 0x95dad48 11:37:18.669: debug : virDomainGetInfo:2825 : domain=0x95dad48, info=0xbfeca708 - tty shut off 11:37:18.673: debug : virDomainFree:2062 : domain=0x95dad48 11:37:18.673: debug : virUnrefDomain:422 : unref domain 0x95dad48 tty 1 11:37:18.673: debug : virReleaseDomain:376 : release domain 0x95dad48 tty 11:37:18.673: debug : virReleaseDomain:392 : unref connection 0x95a1910 2 11:37:18.673: debug : virConnectClose:1355 : conn=0x95a1910 11:37:18.673: debug : virUnrefConnect:259 : unref connection 0x95a1910 1 11:37:18.673: debug : vboxNetworkClose:5448 : network uninitialized 11:37:18.673: debug : vboxStorageClose:6200 : vbox storage uninitialized 11:37:18.673: debug : vboxClose:843 : VBOX: in vboxClose 11:37:18.681: debug : virReleaseConnect:216 : release connection 0x95a1910 even if with some warnings/errors. Do you have any hint? Thank you -- Andrea Turli Ricercatore Direzione Ricerca e Innovazione andrea.turli(a)eng.it Engineering Ingegneria Informatica spa Via Riccardo Morandi, 32 00148 Roma (RM) Tel. +39 06 8307 4710 Fax +39 06 8307 4200 www.eng.it

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[libvirt-users] Updating Multiple VM Guests?
by Kenneth Stailey 12 Nov '10

12 Nov '10

Hi, The libvirt.org FAQ says that "virsh edit" is the recommended way of updating the libvirt xml. If a change has to be made to many VMs "virsh edit" is tedious, time-consuming and likely to be prone to careless errors. Is there a command line approach to updating multiple VMs? Thanks, Ken

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[libvirt-users] New wiki pages with libvirt SSH setup instructions
by Justin Clift 09 Nov '10

09 Nov '10

Hi all, Just added some new pages to the wiki, this time covering how to configure remote access to libvirt through SSH, not using root: http://wiki.libvirt.org/page/SSHSetup <--- entry page http://wiki.libvirt.org/page/SSHPolicyKitSetup This has details for several different Linux distributions: * RHEL 5 & 6 * Fedora 11-13 * Centos 5 & 6 * Ubuntu 10.04 Server & Desktop * openSUSE 11.2 onwards Does anyone have info they'd like to include for other distributions? :) Regards and best wishes, Justin Clift

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[libvirt-users] Problem booting Microsoft Windows KVM virtual machine
by RaSca 04 Nov '10

04 Nov '10

Hi all, I'm having problems with a vm's startup, I cloned the entire disk of a Windows 2000 with dd on a drbd device, that disk was configured with two partitions. I'm able to see all the partitions contents by using kpartx and mount them: # kpartx -l /dev/drbd0 drbd0p1 : 0 202751488 /dev/drbd0 32 drbd0p2 : 0 285567360 /dev/drbd0 202751520 The problem is that when i try to startup the vm with virsh it hangs on boot by saying "error on operating system load". Here are the details and the vm conf: # cat /etc/libvirt/qemu/vm-sophos.xml <domain type='kvm'> <name>vm-sophos</name> <uuid>213a464c-73ad-8122-3647-7ff6b78d9e07</uuid> <memory>262144</memory> <currentMemory>262144</currentMemory> <vcpu>1</vcpu> <os> <type arch='i686' machine='pc-0.12'>hvm</type> <boot dev='cdrom'/> <boot dev='hd'/> </os> <features> <acpi/> <apic/> <pae/> </features> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>restart</on_crash> <devices> <emulator>/usr/bin/kvm</emulator> <disk type='file' device='disk'> <driver name='qemu' type='raw'/> <source file='/dev/drbd0'/> <target dev='hda' bus='ide'/> <address type='drive' controller='0' bus='0' unit='0'/> </disk> <disk type='file' device='cdrom'> <driver name='qemu' type='raw'/> <target dev='hdc' bus='ide'/> <readonly/> <address type='drive' controller='0' bus='1' unit='0'/> </disk> <controller type='ide' index='0'> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/> </controller> <interface type='bridge'> <mac address='52:54:00:15:0d:68'/> <source bridge='br0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> <serial type='pty'> <target port='0'/> </serial> <console type='pty'> <target type='serial' port='0'/> </console> <input type='mouse' bus='ps2'/> <graphics type='vnc' port='-1' autoport='yes' keymap='en-us'/> <video> <model type='cirrus' vram='9216' heads='1'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </video> <memballoon model='virtio'> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </memballoon> </devices> </domain> Note that I've tried to change "source file" parameter with /dev/dm-0p1, /dev/drbd0p1, but virsh don't let me boot the machine saying it is unable to find the disk. The kvm command launched by virsh is this one: /usr/bin/kvm -S -M pc-0.12 -cpu qemu32 -enable-kvm -m 256 -smp 1,sockets=1,cores=1,threads=1 -name vm-sophos -uuid 213a464c-73ad-8122-3647-7ff6b78d9e07 -nodefaults -chardev socket,id=monitor,path=/var/lib/libvirt/qemu/vm-sophos.monitor,server,nowait -mon chardev=monitor,mode=readline -rtc base=utc -boot dc -drive file=/dev/drbd0,if=none,id=drive-ide0-0-0,boot=on,format=raw -device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 -drive if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=raw -device ide-drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 -device rtl8139,vlan=0,id=net0,mac=52:54:00:15:0d:68,bus=pci.0,addr=0x3 -net tap,fd=44,vlan=0,name=hostnet0 -chardev pty,id=serial0 -device isa-serial,chardev=serial0 -usb -vnc 0.0.0.0:0 -k en-us -vga cirrus -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4 I'd also followed the steps described here: http://www.brandonturner.net/blog/2010/01/convert-windows-to-xen-guest/ to use fixmbr and the operation succeed, but the error on the vm is still the same. What should else i check? -- Raoul Scarazzini Mia Mamma Usa Linux: Niente è impossibile da capire, se lo spieghi bene! mobile: +393281776712 rasca(a)miamammausalinux.org http://www.miamammausalinux.org

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[libvirt-users] controlling VM access to different tap devices
by Ryan Haggerty 03 Nov '10

03 Nov '10

Sorry if this off-topic but I have a qemu related question I was going to send to the qemu users mailing list but that list appears to have vanished. I thought this community might have some insight. I am interested in controlling VM access to different tap devices so I want to have different qemu processes bound to different tun devices. I've created new tun devices (eg. /dev/net/tun_low) followed by the use of tunctl to create new tap devices based off of the new device nodes (ie tunctl -t tap0 -f /dev/net/tun_low). This also did not seem to work as the VM's seemed to still be accessing /dev/net/tun (running strace on qemu-spice I found it was still doing an open on /dev/net/tun) and not my new device /dev/net/tun_low. Any suggestions on forcing qemu to use alternative tun devices?

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[libvirt-users] controlling VM access to different tap devices
by Ryan Haggerty 02 Nov '10

02 Nov '10

Sorry if this off-topic but I have a qemu related question I was going to send to the qemu users mailing list but that list appears to have vanished. I thought this community might have some insight. I am interested in controlling VM access to different tap devices so I want to have different qemu processes bound to different tun devices. I've created new tun devices (eg. /dev/net/tun_low) followed by the use of tunctl to create new tap devices based off of the new device nodes (ie tunctl -t tap0 -f /dev/net/tun_low). This also did not seem to work as the VM's seemed to still be accessing /dev/net/tun (running strace on qemu-spice I found it was still doing an open on /dev/net/tun) and not my new device /dev/net/tun_low. Any suggestions on forcing qemu to use alternative tun devices?

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