[PVE-User] USB passthrouh with kernel 4.4.x

[Eneko Lacunza]

Hi all,

We're trying to migrate a Windows server 2000 VMs, from a PVE 3.2 host 
with kernel 2.6.32-28-pve to PVE 4.2 with kernel 4.4.6-1-pve .

This VM has a USB passtrough devide, a GSM modem:
Bus 003 Device 030: ID 1410:5010 Novatel Wireless

Sometimes it appears as 1410:4400 not 1410:5010 :) Don't know why is it 
doing this funny ID changing.

4.4 kernel is loading usb_storage and uas drivers for this, but it is a 
GSM modem.

Passtrough in PVE 3.2 works perfectly.

In PVE 4.4 is not reliable; sometimes VM doesn't see the device, 
sometimes it does see it, but doesn't appear to work almost all the time 
(it is used to send SMS), although sometimes it does send SMSs. This 
doesn't really seem a coverage problem, device led is showing data 
conection.

Any advice regarding this? We have others VMs on this node already, so 
trying different kernels is not an easy option...

Thanks
Eneko

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