[Fwd: Re: [fedora-virt] Hostdev XML Not Working (Libvirt)]

[Robert L Cochran]

Well, I do understand that virt-install and libguestfs are very 
important, but I hope there can be some attention focused on my tiny 
problem. Or perhaps I should file a bug?

Bob



-------- Original Message --------
Subject: 	Re: [fedora-virt] Hostdev XML Not Working (Libvirt)
Date: 	Wed, 27 May 2009 17:28:36 -0400
From: 	Robert L Cochran <cochranb(a)speakeasy.net&gt;
To: 	Cole Robinson <crobinso(a)redhat.com&gt;
CC: 	fedora-virt(a)redhat.com




On 05/27/2009 10:23 AM, Cole Robinson wrote:
>  Robert L Cochran wrote:
>     
> > Why doesn't the hostdev xml shown below for a USB device work? I've
> > shown the entire<devices>  block for context.
> >
> > <devices>
> > <emulator>/usr/bin/qemu-kvm</emulator>
> > <disk type='file' device='cdrom'>
> > <target dev='hdc' bus='ide'/>
> > <readonly/>
> > </disk>
> > <disk type='file' device='disk'>
> > <source file='/var/lib/libvirt/images/Ubuntu9.img'/>
> > <target dev='vda' bus='virtio'/>
> > </disk>
> > <interface type='network'>
> > <mac address='54:52:00:74:32:2f'/>
> > <source network='default'/>
> > <model type='virtio'/>
> > </interface>
> > <serial type='pty'>
> > <target port='0'/>
> > </serial>
> > <console type='pty'>
> > <target port='0'/>
> > </console>
> > <hostdev mode='subsystem' type='usb'>
> > <source>
> > <vendor id='0403'/>
> > <product id='6001'/>
> > </source>
> > </hostdev>
> > <input type='mouse' bus='ps2'/>
> > <graphics type='vnc' port='-1' autoport='yes'/>
> > <sound model='es1370'/>
> > </devices>
> >
> > The USB device of interest to me is an FTDI FT232RL chip. When I plug
> > the board into a USB port on the host, I want it to be passed through to
> > my Ubuntu guest so that it can be seen as /dev/ttyUSB0. The guest
> > doesn't see it. I took the product and vendor id numbers from the
> > /var/log/messages output, and these might be in hexadecimal (and I
> > should be writing e.g.<vendorid=0x0403'/>. I might also be getting the
> > physical handling of the device wrong: maybe it needs to be already
> > plugged in at the time the Ubuntu guest is started up, or maybe I should
> > start the guest first and then plug in the device?
> >
> > Advice appreciated.
> >
> > Bob Cochran
> >
> >      
>
>  For future reference, easiest way to get device product + vendor info is
>  to use 'lsusb'.
>
>  I think you need to use the hex format you mention above to get this to
>  work correctly (<vendor id='0x0403'/>  ...). Also, make sure that the
>  <hostdev>  device is still listed in the domain xml when you use 'virsh
>  dumpxml<domname>': this will guarantee that libvirt is at least
>  recognizing the new xml.
>
>  You can also check /var/log/libvirt/qemu/<domname>.log to see what QEMU
>  command line libvirt is generating, which helps debugging these issues.
>
>  - Cole
>
>
>      
Cole,

Thanks for your response. I modified the file 
/etc/libvirt/qemu/Ubuntu9.xml so that it looks like this:

<domain type='kvm'>
<name>Ubuntu9</name>
<uuid>cb8c3d15-fe92-1bf2-5676-03370743e815</uuid>
<memory>1572864</memory>
<currentMemory>1572864</currentMemory>
<vcpu>1</vcpu>
<os>
<type arch='x86_64' machine='pc'>hvm</type>
<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/qemu-kvm</emulator>
<disk type='file' device='cdrom'>
<target dev='hdc' bus='ide'/>
<readonly/>
</disk>
<disk type='file' device='disk'>
<source file='/var/lib/libvirt/images/Ubuntu9.img'/>
<target dev='vda' bus='virtio'/>
</disk>
<interface type='network'>
<mac address='54:52:00:74:32:2f'/>
<source network='default'/>
<model type='virtio'/>
</interface>
<serial type='pty'>
<target port='0'/>
</serial>
<console type='pty'>
<target port='0'/>
</console>
<hostdev mode='subsystem' type='usb'>
<source>
<vendor id='0x0403'/>
<product id='0x6001'/>
</source>
</hostdev>
<input type='mouse' bus='ps2'/>
<graphics type='vnc' port='-1' autoport='yes'/>
<sound model='es1370'/>
</devices>
</domain>



My interest is getting the Ubuntu machine to recognize the FTDI device 
indicated in the <hostdev> entry you see above. I did not start the 
virtual machine or actually plug the USB device of interest into an 
available port at this point. Instead I ran 'virsh' as you suggested 
above. Here is the output:

[root@deafeng3 qemu]# virsh dumpxml Ubuntu9
<domain type='kvm'>
<name>Ubuntu9</name>
<uuid>cb8c3d15-fe92-1bf2-5676-03370743e815</uuid>
<memory>1572864</memory>
<currentMemory>1572864</currentMemory>
<vcpu>1</vcpu>
<os>
<type arch='x86_64' machine='pc'>hvm</type>
<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/qemu-kvm</emulator>
<disk type='file' device='cdrom'>
<target dev='hdc' bus='ide'/>
<readonly/>
</disk>
<disk type='file' device='disk'>
<source file='/var/lib/libvirt/images/Ubuntu9.img'/>
<target dev='vda' bus='virtio'/>
</disk>
<interface type='network'>
<mac address='54:52:00:74:32:2f'/>
<source network='default'/>
<model type='virtio'/>
</interface>
<serial type='pty'>
<target port='0'/>
</serial>
<console type='pty'>
<target port='0'/>
</console>
<input type='mouse' bus='ps2'/>
<graphics type='vnc' port='-1' autoport='yes'/>
<sound model='es1370'/>
<hostdev mode='subsystem' type='usb' managed='no'>
<source>
<vendor id='0x0103'/>
<product id='0x1771'/>
</source>
</hostdev>
</devices>
</domain>

At this point, I plugged in the USB device I am interested in and again 
ran 'virsh', repeating the command above. Here is the output:

[root@deafeng3 qemu]# virsh dumpxml Ubuntu9
<domain type='kvm'>
<name>Ubuntu9</name>
<uuid>cb8c3d15-fe92-1bf2-5676-03370743e815</uuid>
<memory>1572864</memory>
<currentMemory>1572864</currentMemory>
<vcpu>1</vcpu>
<os>
<type arch='x86_64' machine='pc'>hvm</type>
<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/qemu-kvm</emulator>
<disk type='file' device='cdrom'>
<target dev='hdc' bus='ide'/>
<readonly/>
</disk>
<disk type='file' device='disk'>
<source file='/var/lib/libvirt/images/Ubuntu9.img'/>
<target dev='vda' bus='virtio'/>
</disk>
<interface type='network'>
<mac address='54:52:00:74:32:2f'/>
<source network='default'/>
<model type='virtio'/>
</interface>
<serial type='pty'>
<target port='0'/>
</serial>
<console type='pty'>
<target port='0'/>
</console>
<input type='mouse' bus='ps2'/>
<graphics type='vnc' port='-1' autoport='yes'/>
<sound model='es1370'/>
<hostdev mode='subsystem' type='usb' managed='no'>
<source>
<vendor id='0x0103'/>
<product id='0x1771'/>
</source>
</hostdev>
</devices>
</domain>

I'm not sure what device 0103:1771 is. Here is the output of lsusb. 
Notice the device on bus 007 device 003. This is what I want the Ubuntu 
machine to see and manage.

[root@deafeng3 qemu]# lsusb
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 002: ID 0403:6001 Future Technology Devices 
International, Ltd FT232 USB-Serial (UART) IC
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 006: ID 0c45:63f8 Microdia
Bus 001 Device 011: ID 045e:0084 Microsoft Corp. Basic Optical Mouse
Bus 001 Device 010: ID 046d:c315 Logitech, Inc. Classic New Touch Keyboard
Bus 001 Device 009: ID 051d:0002 American Power Conversion 
Uninterruptible Power Supply
Bus 001 Device 012: ID 413c:8153 Dell Computer Corp.
Bus 001 Device 013: ID 413c:8154 Dell Computer Corp.
Bus 001 Device 003: ID 413c:2513 Dell Computer Corp.
Bus 001 Device 008: ID 0a5c:4500 Broadcom Corp.
Bus 001 Device 007: ID 413c:8149 Dell Computer Corp.
Bus 001 Device 004: ID 413c:2513 Dell Computer Corp.
Bus 001 Device 002: ID 0424:2512 Standard Microsystems Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 002: ID 0a5c:5800 Broadcom Corp.
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

Lastly, you wondered what command line qemu is using. I checked 
/var/log/libvirt/qemu and at the very start of the file I see this:


LC_ALL=C PATH=/sbin:/usr/sbin:/bin:/usr/bin /usr/bin/qemu-kvm -S -M pc 
-m 1536 -smp 1 -name Ubuntu9 -uuid cb8c3d15-fe92-1bf2-5676-03370743e815 
-monitor pty -pidfile /var/run/libvirt/qemu//Ubuntu9.pid -no-reboot 
-boot d -drive 
file=/home/rlc/Download/ubuntu-9.04-desktop-i386.iso,if=ide,media=cdrom,index=2 
-drive file=/var/lib/libvirt/images/Ubuntu9.img,if=virtio,index=0 -net 
nic,macaddr=54:52:00:74:32:2f,vlan=0,model=virtio -net 
tap,fd=18,script=,vlan=0,ifname=vnet0 -serial pty -parallel none -usb 
-vnc 127.0.0.1:0
char device redirected to /dev/pts/1
char device redirected to /dev/pts/2
info cpus
* CPU #0: pc=0x00000000000ffff0 thread_id=3476
cont
balloon 1536
info balloon
balloon: actual=1536
info balloon
balloon: actual=1536
info balloon
balloon: actual=1536
info balloon
balloon: actual=1536
info balloon
balloon: actual=1536
[above two lines repeat for a few thousand lines]

Advice appreciated. How can I get the USB device to work? By the way, I 
thought I have an installed virtual machine on my hard drive, so I'm a 
little puzzled that the reference

-drive file=/home/rlc/Download/ubuntu-9.04-desktop-i386.iso

still exists in the qemu-kvm command line. Am I still starting up from 
the iso image? I'm confused.

Bob

[Fwd: Re: Hostdev XML Not Working (Libvirt)]

[Richard W.M. Jones]

On Mon, Jun 01, 2009 at 05:14:22PM -0400, Robert L Cochran wrote:
>  Well, I do understand that virt-install and libguestfs are very  
>  important, but I hope there can be some attention focused on my tiny  
>  problem. Or perhaps I should file a bug? 
Yes - also try on libvir-list since it's a libvirt problem.

Rich.

-- 
Richard Jones, Emerging Technologies, Red Hat  http://et.redhat.com/~rjones
virt-df lists disk usage of guests without needing to install any
software inside the virtual machine.  Supports Linux and Windows.
http://et.redhat.com/~rjones/virt-df/