VM limited to 3 USB 3.0 devices

[Ivo]

Hello,

i seem to be only able to connect 3 USB3.0 devices to one VM.

Version is 4.4.20.

It seems like the xhci controller only has 4 ports, so adding the 4th device triggers the addition of a nested hub at only 12Mb/s. Is there a way to increase the number of ports, or make the nested hub 5000Mb/s?

<vmid.conf>
...
usb0: host=3-1,usb3=yes
usb1: host=3-2,usb3=yes
usb2: host=3-3,usb3=yes
usb3: host=3-4,usb3=yes
usb4: host=2-5
...

qm monitor <vmid> info usb
Device 0.2, Port 1, Speed 12 Mb/s, Product QEMU USB Tablet, ID: tablet
Device 1.2, Port 1, Speed 480 Mb/s, Product Ext HDD 1021, ID: usb4
Device 2.2, Port 1, Speed 5000 Mb/s, Product ASM1153E, ID: usb0
Device 2.3, Port 2, Speed 5000 Mb/s, Product ASM1153E, ID: usb1
Device 2.4, Port 3, Speed 5000 Mb/s, Product ASMT1053, ID: usb2
Device 2.1, Port 4, Speed 12 Mb/s, Product QEMU USB Hub
Device 2.0, Port 4.1, Speed 5000 Mb/s, Product ASMT1053, ID: usb3

qm monitor <vmid> info usbhost
Bus 3, Addr 9, Port 4, Speed 5000 Mb/s
Class 00: USB device 174c:55aa, ASMT1053
Bus 3, Addr 8, Port 3, Speed 5000 Mb/s
Class 00: USB device 174c:55aa, ASMT1053
Bus 3, Addr 3, Port 2, Speed 5000 Mb/s
Class 00: USB device 174c:55aa, ASM1153E
Bus 3, Addr 2, Port 1, Speed 5000 Mb/s
Class 00: USB device 174c:55aa, ASM1153E
Bus 2, Addr 5, Port 6, Speed 12 Mb/s
Class 00: USB device 0403:6001, FT232R USB UART
Bus 2, Addr 4, Port 5, Speed 480 Mb/s
Class 00: USB device 1058:1021, Ext HDD 1021


lsusb -t on the guest
/: Bus 07.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
/: Bus 06.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
/: Bus 05.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
/: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/6p, 480M
|__ Port 1: Dev 2, If 0, Class=Mass Storage, Driver=usb-storage, 480M
/: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M
|__ Port 1: Dev 2, If 0, Class=Mass Storage, Driver=uas, 5000M
|__ Port 2: Dev 3, If 0, Class=Mass Storage, Driver=uas, 5000M
|__ Port 3: Dev 4, If 0, Class=Mass Storage, Driver=uas, 5000M
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 480M
|__ Port 4: Dev 2, If 0, Class=Hub, Driver=hub/8p, 12M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
|__ Port 1: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 12M

 

[dcsapak]

did you try if the speed is limited?
afaik it only displays as 12M but is not limited

 

[Ivo]

The 4th USB 3.0 drive does not even register in the guest. As you can see in the lsusb of the guest, the 4th device is not listed.

 

[dcsapak]

hmm thats weird, i will see if i have time tomorrow to look at this in more detail

 

[Ivo]

Any news on this?

 

[Ivo]

I also tried it with a usb 3.0 hub, same problem

 

[Ivo]

I actually found a workaround for this by editing /usr/share/perl5/PVE/QemuServer.pm
And changing my $MAX_USB_DEVICES = 5; to my $MAX_USB_DEVICES = 9;

This worked until i did an apt upgrade yesterday. now only 3 USB3 Devices will be mapped in again. (I applied the change again after the update)

my $MAX_USB_DEVICES = 9;

Any way to troubleshoot this? I'm at a loss here.

 

[Ivo]

I found the solution:

There is also a patch needed for /usr/share/perl5/PVE/QemuServer/USB.pm:

push @$devices, '-device', "nec-usb-xhci,id=xhci$pciaddr,p3=$max_usb_devices" if $use_usb3;

Here the ",p3=$max_usb_devices" was added

Could this be changed for some version down the line?

 

[genel]

What has happened with this? I am running version 7.1-10 and the problem still exists. The patch recommended above does not work. I made both changes and still can only access 3 devices.