[Xen-devel] live migration from 4.12 to 4.13 fails due to qemu-xen bug

[Olaf Hering <olaf@xxxxxxxxx>]

I did not find anything in the Xen 4.13 release notes, so I'm asking here:

This HVM domU fails to live migrate from staging-4.12 to staging-4.13:

name='hvm'
serial='pty'
vcpus='4'
memory='888'
disk=[ 'vdev=xvda, format=raw, access=rw, target=/netshare/disk0.raw' ]
vif=[ 'bridge=br0,mac=3c:27:63:58:ca:35' ]
builder="hvm"
device_model_version="qemu-xen"

The receiving qemu fails like that:

char device redirected to /dev/pts/3 (label serial0)
xen_ram_alloc: do not alloc 37000000 bytes of ram at 0 when runstate is 
INMIGRATE
xen_ram_alloc: do not alloc 800000 bytes of ram at 37000000 when runstate is 
INMIGRATE
xen_ram_alloc: do not alloc 10000 bytes of ram at 37800000 when runstate is 
INMIGRATE
xen_ram_alloc: do not alloc 40000 bytes of ram at 37840000 when runstate is 
INMIGRATE
VNC server running on 127.0.0.1:5900
qemu-system-i386: Unknown savevm section type 111
qemu-system-i386: load of migration failed: Invalid argument

Google does not seem to know this specific error.
In fact, every upstream qemu-3.x fails to migrate to qemu-4.x.
Does anyone know what incompatible change was done to qemu.git?

Olaf

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