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PROTechThor 2020-10-26 04:22:27 +01:00
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introduction/faq.md
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@ -487,7 +487,26 @@ Enable "debug mode" in the qube's settings, either by checking the box labeled "
### I created a usbVM and assigned usb controllers to it. Now the usbVM wont boot.
This is probably because one of the controllers does not support reset.
See the [USB Troubleshooting guide](/doc/usb-troubleshooting/#usbVM-does-not-boot-after-creating-and-assigning-USB-controllers-to-it).
See the [USB Troubleshooting guide](/doc/usb-troubleshooting/#usbvm-does-not-boot-after-creating-and-assigning-usb-controllers-to-it).
### I assigned a PCI device to a qube, then unassigned it/shut down the qube. Why isn't the device available in dom0?
This is an intended feature.
A device which was previously assigned to a less trusted qube could attack dom0 if it were automatically reassigned there.
In order to re-enable the device in dom0, either:
* Reboot the physical machine.
or
* Go to the sysfs (`/sys/bus/pci`), find the right device, detach it from the pciback driver and attach back to the original driver. Replace `<BDF>` with your device, for example `00:1c.2`:
echo 0000:<BDF> > /sys/bus/pci/drivers/pciback/unbind
MODALIAS=`cat /sys/bus/pci/devices/0000:<BDF>/modalias`
MOD=`modprobe -R $MODALIAS | head -n 1`
echo 0000:<BDF> > /sys/bus/pci/drivers/$MOD/bind
See also [here][assign_devices].
### How do I install Flash in a Debian qube?