libvirt users - Nov 2018 - usb post passthough stopped workng after kernel upgrade

Greetings,

I have a vm on debian 9.5 to which I pass an specific usb from the host. here is
the relevant part in the vm's xml file:
    <hostdev mode='subsystem' type='usb'
managed='yes'>
      <source>
        <vendor id='0x148f'/>
        <product id='0x5572'/>
      </source>
      <address type='usb' bus='0' port='1'/>
    </hostdev>
the address line was added automatically by libvirt.
everything was working well with kernel 4.15.11-1~bpo9+1 until I needed to
upgrade the kernel to latest possible version due to usb issues
I've upgraded to 4.18.6-1~bpo9+1. after the upgrade, my vm doesn't
starts anymore, I see this msg:
error: Failed to start domain router
error: internal error: qemu unexpectedly closed the monitor:
2018-11-02T13:43:32.174730Z qemu-system-x86_64: -device
usb-host,hostbus=1,hostaddr=4,id=hostdev4,bus=usb.0,port=1: failed to find host
usb device 1:4

how can a kernel upgrade cause this? is there a fix for this issue?

Thanks,

Dagg.

anyone has any idea regarding this issue?
> Sent: Monday, November 05, 2018 at 7:55 PM
> From: daggs <daggs@gmx.com>
> To: libvirt-users@redhat.com
> Subject: [libvirt-users] usb post passthough stopped workng after kernel
upgrade
>
> Greetings,
> 
> I have a vm on debian 9.5 to which I pass an specific usb from the host.
here is the relevant part in the vm's xml file:
>     <hostdev mode='subsystem' type='usb'
managed='yes'>
>       <source>
>         <vendor id='0x148f'/>
>         <product id='0x5572'/>
>       </source>
>       <address type='usb' bus='0' port='1'/>
>     </hostdev>
> the address line was added automatically by libvirt.
> everything was working well with kernel 4.15.11-1~bpo9+1 until I needed to
upgrade the kernel to latest possible version due to usb issues
> I've upgraded to 4.18.6-1~bpo9+1. after the upgrade, my vm doesn't
starts anymore, I see this msg:
> error: Failed to start domain router
> error: internal error: qemu unexpectedly closed the monitor:
2018-11-02T13:43:32.174730Z qemu-system-x86_64: -device
usb-host,hostbus=1,hostaddr=4,id=hostdev4,bus=usb.0,port=1: failed to find host
usb device 1:4
> 
> how can a kernel upgrade cause this? is there a fix for this issue?
> 
> Thanks,
> 
> Dagg.
> 
> _______________________________________________
> libvirt-users mailing list
> libvirt-users@redhat.com
> https://www.redhat.com/mailman/listinfo/libvirt-users
>

Solved!

apparmor was to blame, I've disabled it on kernel params and all works
again.
> Sent: Thursday, November 08, 2018 at 9:16 AM
> From: daggs <daggs@gmx.com>
> To: libvirt-users@redhat.com
> Subject: Re: [libvirt-users] usb post passthough stopped workng after
kernel upgrade
>
> anyone has any idea regarding this issue?
> 
> > Sent: Monday, November 05, 2018 at 7:55 PM
> > From: daggs <daggs@gmx.com>
> > To: libvirt-users@redhat.com
> > Subject: [libvirt-users] usb post passthough stopped workng after
kernel upgrade
> >
> > Greetings,
> > 
> > I have a vm on debian 9.5 to which I pass an specific usb from the
host. here is the relevant part in the vm's xml file:
> >     <hostdev mode='subsystem' type='usb'
managed='yes'>
> >       <source>
> >         <vendor id='0x148f'/>
> >         <product id='0x5572'/>
> >       </source>
> >       <address type='usb' bus='0'
port='1'/>
> >     </hostdev>
> > the address line was added automatically by libvirt.
> > everything was working well with kernel 4.15.11-1~bpo9+1 until I
needed to upgrade the kernel to latest possible version due to usb issues
> > I've upgraded to 4.18.6-1~bpo9+1. after the upgrade, my vm
doesn't starts anymore, I see this msg:
> > error: Failed to start domain router
> > error: internal error: qemu unexpectedly closed the monitor:
2018-11-02T13:43:32.174730Z qemu-system-x86_64: -device
usb-host,hostbus=1,hostaddr=4,id=hostdev4,bus=usb.0,port=1: failed to find host
usb device 1:4
> > 
> > how can a kernel upgrade cause this? is there a fix for this issue?
> > 
> > Thanks,
> > 
> > Dagg.
> > 
> > _______________________________________________
> > libvirt-users mailing list
> > libvirt-users@redhat.com
> > https://www.redhat.com/mailman/listinfo/libvirt-users
> > 
> 
> _______________________________________________
> libvirt-users mailing list
> libvirt-users@redhat.com
> https://www.redhat.com/mailman/listinfo/libvirt-users
>