Hey,
At FUDCon yesterday, Paul asked me about how to get KVM USB device passthrough working and I had to admit I'd never tried it.
So, after some poking with F-11, here's what I found:
1) You need selinux-policy-targeted-3.6.12-55.fc11 or later
2) Make sure the virt_use_usb SELinux boolean is enabled, which it should be by default:
$> getsebool virt_use_usb virt_use_usb --> on $> setsebool -P virt_use_usb on
3) Plug your device in, and if it's a USB mass storage device, make sure it's not mounted in the host
4) In virt-manager, open the VM window, go to the details tap, clock 'Add hardware', select 'Phyiscal host device', choose 'USB device', then the device you wish to passthrough
5) Take a peek at the device in the guest XML config
$> virsh dumpxml xp ... <devices> ... <hostdev mode='subsystem' type='usb' managed='yes'> <source> <vendor id='0x0dda'/> <product id='0x0001'/> </source> </hostdev> </devices>
6) Start the guest and check whether the guest can see it. If not, check /var/log/libvirt/qemu/$guest.log because qemu will happily start up even if the device cannot be assigned.
7) It sucks that the device has to be plugged in before you start the guest; qemu now has a "autoconnect" mode which probably makes sense for libvirt to use by default, see bug #508645
Cheers, Mark.
This is precisely what I brought up on this list weeks ago -- USB device pass through. Thanks to work done by Mark and also Dan Walsh, I'm succeeding with something called a USB BUB developed by Paul Badger of moderndevice.com and Brian Riley of wulfden.org. The BUB is essentially an FTDI FT232RL-based uart. I use it to program my Freeduino devices, which I purchase as kits from Brian. I expect to pass other USB devices through to my Ubuntu guest as well.
Thanks again to Mark and Dan for the fantastic support when I both complained and filed a bug related to USB device passthrough.
Bob Cochran
On 06/29/2009 06:19 AM, Mark McLoughlin wrote:
Hey,
At FUDCon yesterday, Paul asked me about how to get KVM USB device passthrough working and I had to admit I'd never tried it.
So, after some poking with F-11, here's what I found:
You need selinux-policy-targeted-3.6.12-55.fc11 or later
Make sure the virt_use_usb SELinux boolean is enabled, which it should be by default:
$> getsebool virt_use_usb virt_use_usb --> on $> setsebool -P virt_use_usb on
Plug your device in, and if it's a USB mass storage device, make sure it's not mounted in the host
In virt-manager, open the VM window, go to the details tap, clock 'Add hardware', select 'Phyiscal host device', choose 'USB device', then the device you wish to passthrough
Take a peek at the device in the guest XML config
$> virsh dumpxml xp ...
<devices> ... <hostdev mode='subsystem' type='usb' managed='yes'> <source> <vendor id='0x0dda'/> <product id='0x0001'/> </source> </hostdev> </devices>
Start the guest and check whether the guest can see it. If not, check /var/log/libvirt/qemu/$guest.log because qemu will happily start up even if the device cannot be assigned.
It sucks that the device has to be plugged in before you start the guest; qemu now has a "autoconnect" mode which probably makes sense for libvirt to use by default, see bug #508645
Cheers, Mark.
Fedora-virt mailing list Fedora-virt@redhat.com https://www.redhat.com/mailman/listinfo/fedora-virt
On Mon, Jun 29, 2009 at 11:19:53AM +0100, Mark McLoughlin wrote:
At FUDCon yesterday, Paul asked me about how to get KVM USB device passthrough working and I had to admit I'd never tried it. So, after some poking with F-11, here's what I found:
Keep in mind that kvm currently only supports USB1.1 for forwarding to the guest. Some devices (especially current iphones/ipods) need USB2 to work.
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Frank Murphy -
Mark McLoughlin -
Robert L Cochran -
Sven Lankes