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

[Rokas Kupstys]

Oh this is interesting, i will definitely try this. Even if it is not
exposed to libvirt we can pass custom command line parameters via xml.
Thanks a lot!

Rokas Kupstys

On 2016.08.24 03:31, Samuel Holland wrote:
> Hello,
>
> On 08/23/2016 02:07 AM, Rokas Kupstys 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.
>
> Sorry for all of the not-quite-accurate answers you've gotten. You
> _can_, in fact, pass through a USB port by its location:
>
> $ qemu-system-x86_64 -device usb-host,? 2>&1 | sort
> usb-host.bootindex=int32
> usb-host.full-path=bool (on/off)
> usb-host.hostaddr=uint32
> usb-host.hostbus=uint32
> usb-host.hostport=str
> usb-host.isobsize=uint32
> usb-host.isobufs=uint32
> usb-host.loglevel=uint32
> usb-host.msos-desc=bool (on/off)
> usb-host.pipeline=bool (on/off)
> usb-host.port=str
> usb-host.productid=uint32
> usb-host.serial=str
> usb-host.vendorid=uint32
>
> See the hostbus and hostport options. I don't know if this is exposed by
> libvirt, since I don't use that, but at least qemu has support for it.
>
>> Is there any solution to this?
>
> Passing through a port using `-device usb-host,hostbus=foo,hostport=bar`
> is one solution. Another solution can be to use your several integrated
> USB controllers (if you have an Intel chipset). Even though all of your
> devices may show up on one controller, you can change which controller
> the ports are attached to in the PCI configuration space. See [1] and
> the thread at [2].
>
> Hope that helps,
> Samuel
>
> [1] http://sholland.org/thoughts.html#2016-02-29
> [2]
> https://www.redhat.com/archives/vfio-users/2016-February/msg00110.html
>
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