Bug 1268290

USB camera attached at client and forwarded to guest disconnects after migration.

Client prints message:

"USB redirection error: Webcam C170 [046d:082b] at 2-15 rejected by host"

Destination qemu-kvm prints:

"qemu-kvm: usb-redir error: Device no longer matches speed after endpoint info change, disconnecting!"


Guest is RHEL7 with spice-vdagent-0.14.0-9.el7.x86_64
Client is RHEL7 with virt-viewer-2.0.6.el7.x86_64
Server is RHEL7 with:
spice-server-0.12.4-9.el7_1.3.x86_64 + spice-server-0.12.4-9.el7_1.1
qemu-kvm-1.5.3-86.el7_1.6.x86_64
kernel-3.10.0-229.el7.x86_64

Always, 100% reproducible


Steps to Reproduce:
1. run two instances qemu-kvm (src-qemu -> dst-qemu)
2. connect with remote-viewer spice://xx.xx.xx.xx:3000 to running src-qemu
3. Select & pass USB Camera in remote-viewer menu to guest
4. Start migration
5. Wait for migration is fished (`info migrate' in qemu monitor)
6. Try to use camera

Source qemu:
/usr/libexec/qemu-kvm -m 1024 -spice port=$SRCPORT,disable-ticketing,addr=$SRCIPADDR,seamless-migration=on -vga qxl -device virtio-serial -chardev spicevmc,id=vdagent,name=vdagent,debug=0 -device virtserialport,chardev=vdagent,name=com.redhat.spice.0 -chardev spicevmc,name=usbredir,id=usbredirchardev1 -device usb-redir,chardev=usbredirchardev1,id=usbredirdev1,debug=3 -readconfig /etc/qemu-kvm/ich9-ehci-uhci.cfg $GUEST_IMAGE_PATH -monitor stdio -usb

Destination qemu:
/usr/libexec/qemu-kvm -m 1024 -spice port=$DSTPORT,disable-ticketing,addr=$DSTIPADDR,seamless-migration=on -vga qxl -device virtio-serial -chardev spicevmc,id=vdagent,name=vdagent,debug=0 -device virtserialport,chardev=vdagent,name=com.redhat.spice.0 -chardev spicevmc,name=usbredir,id=usbredirchardev1 -device usb-redir,chardev=usbredirchardev1,id=usbredirdev1,debug=3 -readconfig /etc/qemu-kvm/ich9-ehci-uhci.cfg $GUEST_IMAGE_PATH -monitor stdio -incoming tcp:$DSTMIGIPADDR:$DSTMIGPORT -usb

Where:
export SRCPORT=3000
export SRCIPADDR="::"
export DSTPORT="3001"
export DSTIPADDR="::"
export GUEST_IMAGE_PATH="/var/lib/libvirt/images/rhel7.0.qcow2"
export DSTMIGIPADDR="127.0.0.1"
export DSTMIGPORT="55555"


cat /etc/qemu-kvm/ich9-ehci-uhci.cfg 
###########################################################################
#
# You can pass this file directly to qemu using the -readconfig
# command line switch.
#
# This config file creates a EHCI adapter with companion UHCI
# controllers as multifunction device in PCI slot "1d".
#
# Specify "bus=ehci.0" when creating usb devices to hook them up
# there.
#

[device "ehci"]
  driver = "ich9-usb-ehci1"
  addr = "1d.7"
  multifunction = "on"

[device "uhci-1"]
  driver = "ich9-usb-uhci1"
  addr = "1d.0"
  multifunction = "on"
  masterbus = "ehci.0"
  firstport = "0"

[device "uhci-2"]
  driver = "ich9-usb-uhci2"
  addr = "1d.1"
  multifunction = "on"
  masterbus = "ehci.0"
  firstport = "2"

[device "uhci-3"]
  driver = "ich9-usb-uhci3"
  addr = "1d.2"
  multifunction = "on"
  masterbus = "ehci.0"
  firstport = "4"


Commands to activate migration from source qemu to destination qemu:

(qemu) client_migrate_info spice xx.xx.xx.xx 3001
(qemu) migrate -d tcp:127.0.0.1:55555


Interesting thing that I can successfully migrate USB storage stick