KVM / Windows XP guest / USB devices

scar scar at drigon.com
Sun Feb 7 22:33:51 UTC 2010

Hash: SHA256

scar @ 02/04/2010 12:17 PM:
> [snip]
> i have an external USB hard disk plugged into the host system, and
> it is formatted fat32.  i want to read/write to this disk in the winxp
> guest.

figured this part out.  in virt-manager i opened the VM, went to the
hardware tab, and added a storage device. i chose block device and
pointed it to the entire disk, not the partition (e.g. /dev/sdb and not
/dev/sdb1).  i chose type 'ide device' and then booted up the VM.
worked great.

> additionally, i have a scanner which isn't yet supported by sane (which
> was the main reason for installing a winxp guest OS) that i want to
> install the drivers for and use inside the winxp guest.

still trying to figure this part out.

i tried using 'lsusb' to get the ID of the device (xxxx:yyyy), and then
i manually added a USB device to the VM's XML file (in
/etc/libvirt/qemu) following the info at [1].  i took xxxx to be the
vendor id and yyyy to be the product id, and prepended "0x".  then i
redefined the VM ('sudo virsh define /etc/libvirt/qemu/myvm.xml') and
restarted it.  but that didn't work... i can't even see the device
showing up in device manager...

1. http://libvirt.org/formatdomain.html#elementsUSB


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