On Thu, 11 Apr 2019, jrsmi...@gmail.com wrote:
> On Wednesday, April 10, 2019 at 3:25:34 AM UTC-7, unman wrote:
> > On Tue, Apr 09, 2019 at 11:45:02AM -0700, jrsmi...@gmail.com wrote:
> > > If there is no signal on PS/2 ground or I can eliminate it, is this the
> > > more secure route or is it worth doing the USB shuffle? I have 4 USB
> > > controllers available.
> > >
> >
> > If you really have 4 USB controllers I would allocate one to dom0 and 3
> > to sys-usb (or more than one sys-usb).
> > Depending on your level of paranoia you might want to permanently attach
> > the devices to the usb port in dom0 - I mean physically.
>
> I see now why you phrased it the way you did ("If you really have 4 USB
> controllers..."). After running `sudo lspci -vv | grep -i usb` and getting
> back only two hits as dom0 I began digging. After all, my mobo docs and box
> says:
>
> Chipset+Intel ® Thunderbolt TM 3 Controller:
> - 2 x USB Type-C TM ports on the back panel, with USB 3.1 Gen 2 support
> Chipset+ASMedia ® USB 3.1 Gen 2 Controller:
> - 1 x USB Type-C TM port with USB 3.1 Gen 2 support, available through the
> internal USB header
> Chipset+Realtek ® USB 3.1 Gen 1 Hub:
> - 4 x USB 3.1 Gen 1 ports on the back panel
> Chipset:
> - 4 x USB 3.1 Gen 1 ports available through the internal USB headers
> - 6 x USB 2.0/1.1 ports (2 ports on the back panel, 4 ports available through
> the internal USB headers)
>
> so *obviously* there are four USB controllers, right? I can account for one
> of them not showing up, that's the controller in the Tunderbolt chipset.
> This shows up in Ubuntu as one of three USB controllers seen by lspci, but
> Qubes doesn't see it. The fourth could be the USB 3.1 Gen 2 front panel
> controller, which I haven't populated yet.
>
> Some of the docs I ran across describing lsusb looked promising, but
> then they would say something like, "you can see from the output above
> that there are two controllers", but it wasn't clear to me which were
> controllers vs hubs. I did learn that some controllers have multiple
> hubs (say USB 2.0 and USB 3.0), but it's much less straightforward to
> clearly identify the USB controllers than I thought it would be. I'm no
> longer sure that even that is the correct way to look at it since there
> could be multiple controllers on the same PCIe bus and the level of
> granularity we have to work with in Qubes is at the PCIe level.
You could see if your bios allows disabling USB3/XHCI for the chipset
USB controllers. There are some USB combining tricks on some MBs that
might eat away (two) ehci controllers (and output only one xhci
controller).
--
i.
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