Hi all, I have a KVM system running debian squeeze with the backports qemu-kvm packages: # dpkg --list |grep kvm ii qemu-kvm 1.1.2+dfsg-5~bpo60+1 Full virtualization on x86 hardware I'm running 2 VM's with Windows 7 installed. The software running on the VM's require a hardware USB dongle (for licensing). I managed to get them to work using USB2.0 passthrough using the usb2 controller config file (ich9-ehci-uhci.cfg). I've added the following command line switches to the kvm command: -readconfig /kvm/ich9-ehci-uhci.cfg -device usb-host,hostbus=2,hostaddr=3,bus=ehci.0 offcourse for the other vm it uses a different hostbus,hostaddr. So far so good and everything works. Now when I reboot one of the VM's the USB dongle doesn't work anymore and comes up in windows device manager with a yellow exclamation mark with the status: "This device cannot start. (Code 10)" To get it to work again, i have to shutodwn the entire kvm host system and boot it up again forcing me to shutdown all other VM's too. It seems the USB Dongle expects some kind of power cycle between reboots and obviously this power cycle never happens on a virtualized system. I tested with a simple USB Flash Drive which didn't have any issues after a reboot of the VM, so i guess i need to look at the USB Dongle which causes this behaviour. Now my question: Is there a way to force a power cycle or reset of a single USB port while rebooting a VM or is there another way I can fix this? Kind regards and thanks in advance, Caspar -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
