[vfio-users] USB >>port<< passthrough

[Jayme Howard]

You can't pass the port itself.  You can pass individual devices attached
to a port, but the latency can get weird sometimes.  I had pretty
significant problems when I did it that way.  I opted to use Francisco's
solution above, with a slight adjustment.  I have a dedicated card that
gets allocated to the VM.  Connected to that, and to one of the host's USB
ports, I have a USB A/B switch.  Connected to the switch is a 4 port hub.
Connected to the hub is my keyboard and mouse.  All I have to do to switch
the inputs from the host to the guest and back is to choose A or B on the
switch, and a few seconds later all input is directed to the correct
location.

On Tue, Aug 23, 2016 at 5:28 AM, Quentin Deldycke <quentindeldycke at gmail.com
> wrote:

> Yes, it is best way.
>
> My motherboard have 2 controllers. One is all time on Linux, the other one
> move between both.
>
> Keyboard mouse on the moving one, printer and other device all time on
> Linux.
>
> On 23 Aug 2016 12:16 p.m., "Francisco Menendez" <aterfelis at gmail.com>
> wrote:
>
>> If you don't mind spending a few dollars, what I did was basically buy
>> a PCIe USB port card, then give it exclusive control of the device to
>> the guest. I can't use it in the host, but I have other USB ports for
>> the host, so no biggie.
>>
>> On Tue, Aug 23, 2016 at 4:07 PM, Rokas Kupstys <rokups at zoho.com> wrote:
>> > Is it possible to pass-through USB port? I know we can pass-through
>> > specific usb devices or entire usb controllers however it is not ideal
>> > in all cases. For instance in my case single pci device drives all usb
>> > ports on the back panel. Naturally i cant pass-through that pci device
>> > because it would leave me without access to the host. Passing through
>> > USB devices is of little use if one wishes to use kvm switch -
>> > mouse/keyboard switched to another port would still have same
>> > vendor/device ids. Is there any solution to this?
>> >
>> > --
>> > Rokas Kupstys
>> >
>> >
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