> > The original error ("unable to reset PCI device...") still occurs when 
> > trying to start disp-sys-usb.
> >
>
> Despite have the "no-strict-reset" set to True, you will continue to see the 
> "Unable to reset PCI device: ... no FLR, PM reset or bus reset available" 
> "error" message each time you are trying to attach a PCI device that does not 
> support the FLR (Function Level Reset) [2].
>
> The "no-strict-reset" enablement patch [1] allows you (libvirt) to assign a 
> PCI device to domU, even when the device does not support any reset method .

Hum, I have just realized that you have also noticed one more error:

> 
> libxl_pci.c: libxl__device_pci_reset: The kernel doesn't support reset from 
> sysfs for PCI device 0000:00:14.0
> 
> 


It looks like this error is related to this code 
https://xenbits.xen.org/gitweb/?p=xen.git;a=blob;f=tools/libxl/libxl_pci.c;h=6f8f49c7c0a80478b244c52ae65e75f8a78c6481;hb=b03cee73197f4a37bf2941b9367105187355e638#l1150
 
[https://xenbits.xen.org/gitweb/?p=xen.git;a=blob;f=tools/libxl/libxl_pci.c;h=6f8f49c7c0a80478b244c52ae65e75f8a78c6481;hb=b03cee73197f4a37bf2941b9367105187355e638#l1150]
where, it appears to me at the first sight, we are not patching it.

I raised that question here 
https://github.com/QubesOS/qubes-issues/issues/3518#issuecomment-579526805

Kind regards,
Andrey Arapov


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