live migration to qemu.git fails

[Olaf Hering <olaf@aepfle.de>]

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Doing a live migration of a HVM domU from staging-4.5 with its included
qemu-xen to staging-4.7 with qemu-xen from qemu.org (either master or
2.6.0) fails:

# cat /var/log/xen/qemu-dm-fv-x64-sles12sp1-clean--incoming.log
char device redirected to /dev/pts/4 (label serial0)
xen_ram_alloc: do not alloc f800000 bytes of ram at 0 when runstate is INMIGRATE
xen_ram_alloc: do not alloc 800000 bytes of ram at f800000 when runstate is INMIGRATE
xen_ram_alloc: do not alloc 10000 bytes of ram at 10000000 when runstate is INMIGRATE
xen_ram_alloc: do not alloc 40000 bytes of ram at 10010000 when runstate is INMIGRATE
VNC server running on 127.0.0.1:5900
qemu-system-i386: Expected vmdescription section, but got 0


'xl vnc domU' on the receiver side just shows "guest has not initialized
display yet". For some reason the domU is still alive, 'vmstat 1' via
ssh keeps running.

'xl shutdown domU' fails. It looks like the guest OS shuts down, the ssh
connection gets terminated, but the domU becomes busy according to 'xl
top', and never shuts down.

domU.cfg looks like this:
name="fv-x64-sles12sp1-clean"
memory=256
serial="pty"
builder="hvm"
boot="cd"
disk=[
        'file:/disk0.raw,hda,w',
        'file:/DVD1.iso,hdc:cdrom,r',
]
vif=[
        'bridge=br0'
]
keymap="de"
vfb = [
        'type=vnc,vncunused=1,keymap=de'
]

usb=1
usbdevice='tablet'
device_model_override="/root/dm.sh"


The override is to make sure to use qemu-xen as included in xen-4.5 on
the sending side and qemu.git on the receiving side.

Olaf

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