Greetings! I created Bug 504444 <https://bugzilla.redhat.com/show_bug.cgi?id=504444> which is partially quoted in this post: ---------------------------------------------------------------- Coding this xml: <hostdev mode='subsystem' type='usb'> <source> <vendor id='0x0403'/> <product id='0x6001'/> </source> </hostdev> should let my Ubuntu 9.04 guest have access to the device, which in this case is a USB-to-Serial UART (based on an FTDI FT232RL chip.) However the guest does not "see" the device or recognize it in any way. It does not show up in the guest's /var/log/messages or in the output of lsusb. I would like the guest to have access to this device. This is what virsh seems to be seeing: # 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='0x0403'/> <product id='0x6001'/> </source> </hostdev> </devices> </domain> Version-Release number of selected component (if applicable): libvirt-0.6.2-11.fc11.x86_64 ---------------------------------- Any suggestions for fixing this problem? Is there a clear procedure for getting a Fedora virtualization guest to recognize a USB device? Thanks for your help! Bob Cochran