PV USB documentation needs to be updated for Qubes R3.2

[adrelanos]

Now, that #531 is done in R3.2... I think PVUSB documentation needs to be updated.

• https://www.qubes-os.org/doc/pvusb/
• https://www.qubes-os.org/doc/security-guidelines/#tocAnchor-1-1-8
• https://www.qubes-os.org/doc/user-faq/#i-created-a-usbvm-and-assigned-usb-controllers-to-it-now-the-usbvm-wont-boot

Suggested contents:

• What is PVUSB?
• Why should I use it?
• Is PVUSB stable or experimental?
• How do I get (setup) it if I install Qubes R3.2?
• How do I get (setup) it if I upgraded Qubes to R3.2?
• Perhaps document what to do if one can only connect only USB input devices... And worse so, if these are internally connected to the same USB controller as all other USB devices... (Such as in my case.) If that is still an issue?
  • How to recover from situations where my keyboard and mice stops working?
• document #1630 - if that still applies?
• document #1649
• Anything else?

[Sen-Dion]

Correct the policy in How to use a USB keyboard manual. It should be:
sys-usb dom0 ask,user=root

[Sen-Dion]

Correct the policy in How to use a USB keyboard manual. It should be:
sys-usb dom0 ask,user=root

[andrewdavidwong]

@Sen-Dion: Updated.

[andrewdavidwong]

@Sen-Dion: Updated.