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Description of problem: -------------------------- On latest RHEL6.5 host, migrate guest with -M 6.0.0 or 6.1.0, after migration, info mice shows PS/2 instead of usb tablet, and on des host, mice suffers from dislocation problem. It works fine with -M 6.2.0, 6.3.0, 6.4.0 and 6.5.0, all RHEL6 Z stream has the same problem. We find this in recent round of stable guest abi test, it seems we have this problem for a long time, probably a WONTFIX one, but i fail to locate the old bug. Version-Release number of selected component (if applicable): --------------------------------------------------------------- qemu-kvm-0.12.1.2-2.414.el6 connection: vnc guest: win2012-64 How reproducible: -------------------- 100% Steps to Reproduce: -------------------- 1. ping pong migration CMD: /usr/libexec/qemu-kvm -enable-kvm -M rhel6.1.0 -smp 4 -m 4G -name win2012 -uuid 3f2ea5cd-3d29-48ff-aab2-23df1b6ae213 -drive file=nfs/win2012-64-virtio.qcow2,cache=none,if=none,rerror=stop,werror=stop,id=drive-virtio-disk0,format=qcow2,aio=native -device virtio-blk-pci,drive=drive-virtio-disk0,id=device-virtio-disk0 -netdev tap,script=/etc/qemu-ifup,id=netdev0 -device virtio-net-pci,netdev=netdev0,id=device-net0,mac=aa:54:00:11:22:33 -boot order=cd -monitor stdio -usb -device usb-tablet,id=input0 -chardev socket,id=s1,path=/tmp/s1,server,nowait -device isa-serial,chardev=s1 -vnc :10 -monitor tcp::1234,server,nowait
Maybe a similar issue with: Bug 823846 - USB tablet mouse does not work well when migrating guest rhel6.0->rhel6.3 or rhel6.1->rhel6.3 According to Gerd, usb tablet migration in 6.0 and 6.1 is broken.
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> On latest RHEL6.5 host, migrate guest with -M 6.0.0 or 6.1.0, after > migration, info mice shows PS/2 instead of usb tablet, and on des host, mice > suffers from dislocation problem. It works fine with -M 6.2.0, 6.3.0, 6.4.0 > and 6.5.0, all RHEL6 Z stream has the same problem. > > We find this in recent round of stable guest abi test, it seems we have this > problem for a long time, probably a WONTFIX one, but i fail to locate the > old bug. WONTFIX indeed. live migration support for usb devices was added in 6.2.0. For bug compatibility reasons it must be turned off for 6.1.0 and 6.0.0 machine types. So live migration with these machine types and usb devices has a few known issues which can't be fixed without breaking live migration to RHEL-6.{0,1} qemu-kvm versions.