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[Xen-users] PCI passthrough not working during boot for one device.



Hello,

I am using
options xen-pciback hide=(0000:02:00.0)(0000:04:00.0)(0000:06:00.0)
in /etc/modprobe.d/xen-pciback.conf to passthrough my USB controller to guest.

Everything worked perfect, but now after some update, it's no longer working.
It's not working only for the USB controller 04:00.0. 
02:00.0 and 06:00.0 which are LAN adapters are passed successfully.

When system boot up is done, I can issue the command:
xl pci-assignable-add 00:04:00.0
and then I can launch the guest that use the USB controller.

I mean that pci passthrough is working from command line, but its not working during boot time for that specific 04:00.0 device.

I can put 

xl pci-assignable-add 00:04:00.0
xl create /etc/xen/vm1.cfg

in /etc/rc.local but that is some ugly solution.


Currently I am using Debian/testing with kernel 4.3 and 4.4-rc8 and xen 4.6.

I don't know where to look for clues as there is no error messages in dmesg syslog.
Any ideas/suggestions how to fix that are welcome.

Thank you.

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