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Update manual USB qube creation instructions

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Also: Fix broken link to Assigning Devices page

This commit updates the manual USB qube creation instructions
based on user feedback from this discussion thread:

https://groups.google.com/d/topic/qubes-users/mPPZy57kw0w/discussion
This commit is contained in:
Andrew David Wong 2016-06-12 07:45:37 -07:00
parent 1b0bec296b
commit 85c5eda80c
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1 changed files with 20 additions and 8 deletions
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28
common-tasks/usb.md
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@ -28,7 +28,7 @@ Qubes OS supports the ability to attach a USB drive (or just one or more of its
partitions) to any qube easily, no matter which qube actually handles the USB
controller. (The USB controller may be assigned on the **Devices** tab of a
qube's settings page in Qubes VM Manager or by using the
[qvm-pci][assigning-devices] command. For guidance on finding the correct USB
[qvm-pci][Assigning Devices] command. For guidance on finding the correct USB
controller, see [here][usb-controller].)
USB drive mounting is integrated into the Qubes VM Manager GUI. Simply insert
@ -182,13 +182,25 @@ steps as root in dom0:
Alternatively, you can create a USB qube manually as follows:
1. In a dom0 terminal, type `lsusb` to check if you have a USB controller free
of input devices or programmable devices. If you find such free controller,
note its name and proceed to step 2.
1. Read the [Assigning Devices] page to learn how to list and identify your
USB controllers. Carefully check whether you have a USB controller that
would be appropriate to assign to a USB qube. Note that it should be free
of input devices, programmable devices, and any other devices that must be
directly available to dom0. If you find a free controller, note its name
and proceed to step 2.
2. Create a new qube. Give it an appropriate name and color label
(recommended: `sys-usb`, red).
3. In the qube's settings, go to the "Devices" tab. Find your USB controller
in the "Available" list. Move it to the "Selected" list.
(recommended: `sys-usb`, red). If you need to attach a networking device,
it might make sense to create a NetVM. If not, an AppVM might make more
sense. (The default `sys-usb` is a NetVM.)
3. In the qube's settings, go to the "Devices" tab. Find the USB controller
that you identified in step 1 in the "Available" list. Move it to the
"Selected" list.
**Caution:** By assigning a USB controller to a USB qube, it will no longer
be available to dom0. This can make your system unusable if, for example,
you have only one USB controller, and you are running Qubes off of a USB
drive.
4. Click "OK." Restart the qube.
5. Recommended: Check the box on the "Basic" tab which says "Start VM
automatically on boot." (This will help to mitigate attacks in which
@ -242,7 +254,7 @@ You can now use your USB keyboard.
[mass-storage]: https://en.wikipedia.org/wiki/USB_mass_storage_device_class
[devices]: /doc/assigning-devices/
[Assigning Devices]: /doc/assigning-devices/
[usb-controller]: /doc/assigning-devices/#finding-the-right-usb-controller
[623]: https://github.com/QubesOS/qubes-issues/issues/623
[1072-comm1]: https://github.com/QubesOS/qubes-issues/issues/1072#issuecomment-124270051