[BUG] usb devices disappear on xl reboot or reboot from inside of HVM DomU

[Petr Fedchenkov <giggsoff@xxxxxxxxx>]

Hi.

I have the HVM DomU with usb device assigned to it

Config for xl:

# This file is automatically generated by domainmgr

name = "12e26d98-2f0d-450c-a1ee-d287bd37794c.1.1"

type = "hvm"

uuid = "12e26d98-2f0d-450c-a1ee-d287bd37794c"

vnc = 0

memory = 977

maxmem = 977

vcpus = 1

maxcpus = 1

boot = "dc"

disk = ['/persist/vault/volumes/630ad2a6-cd3f-4659-8ac0-cdcfd5ad6b75#0.qcow2,qcow2,xvda,rw','/run/domainmgr/cloudinit/12e26d98-2f0d-450c-a1ee-d287bd37794c.cidata,raw,xvdz,ro']

vif = ['bridge=bn1,vifname=nbu1x1,mac=00:16:3e:00:01:01,type=vif']

serial = ['pty']

usbctrl = ['type=auto, version=2, ports=6']

usbdev = ['hostbus=2,hostaddr=2,controller=0,port=1']

It boots and works as expected.

But after doing xl reboot or reboot from inside DomU, I cannot see usb devices inside VM.

Before reboot:

#xenstore-ls

...

vusb = ""

    0 = ""

     type = "devicemodel"

     usb-ver = "2"

     num-ports = "6"

     port = ""

      1 = "2-1"

      2 = ""

      3 = ""

      4 = ""

      5 = ""

      6 = ""

#xl usb-list

Devid  Type         BE  state usb-ver ports

0      devicemodel  0   0     2       6    

  Port 1: Bus 002 Device 002

  Port 2:

  Port 3:

  Port 4:

  Port 5:

  Port 6:

After reboot:

#xenstore-ls

...

vusb = ""

    0 = ""

     type = "devicemodel"

     usb-ver = "2"

     num-ports = "6"

     port = ""

      1 = ""

      2 = ""

      3 = ""

      4 = ""

      5 = ""

      6 = ""

#xl usb-list

Devid  Type         BE  state usb-ver ports

0      devicemodel  0   0     2       6    

  Port 1:

  Port 2:

  Port 3:

  Port 4:

  Port 5:

  Port 6:

Steps to reproduce are inside https://github.com/lf-edge/eden/issues/578

xen_version            : 4.14.1

Best regard,

Petr Fedchenkov