[Qemu-devel] xhci migration breakage

["Dr. David Alan Gilbert" <dgilbert@redhat.com>]

Hi Gerd,
  2.9 seems to have an xhci migration breakage, I've bisected it
down to:
commit ddb603ab6c981c1d67cb42266fc700c33e5b2d8f
Author: Gerd Hoffmann <kraxel@redhat.com>
Date:   Mon Jan 30 16:36:46 2017 +0100

    xhci: don't kick in xhci_submit and xhci_fire_ctl_transfer

I guess maybe there's a kick needed pre/post migrate?

(it's https://bugzilla.redhat.com/show_bug.cgi?id=1436616 )

The symptoms on the destination are that the qemu prints:

qemu-kvm: usb-msd: Bad signature 53425300

and the guest sees:
  xhci_hcd 0000:00:06.0: WARN Event TRB for slot 1 ep 0 with no TDs queued?
  xhci_hcd 0000:00:06.0: WARN Event TRB for slot 1 ep 2 with no TDs queued?
  xhci_hcd 0000:00:06.0: WARN Event TRB for slot 1 ep 3 with no TDs queued?

and never gets any more IO on the USB disk.

Any ideas?

Dave

--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK