live migration between qemu-kvm 1.0 and 0.15

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Hi,

is live migration between qemu-kvm stable-0.15 and stable-1.0 trees possible?
When I live migrate a VM from 1.0 to 0.15, the destination side 0.15 qemu-kvm
exits with:
(qemu) Unknown savevm section or instance 'i8259' 0

That's expected, since commit "i8259:convert to qdev" 747c70af78f7088f182c87e683bdf847beead1e4
introduces the i8259 device in the qdev tree.

The other direction (live migrate from 0.15.1 to 1.0.0) seems to work fine.
Are any other issues expected in this direction?

The vmstate for i8259 has not changed between these trees afaict. If the
qdev-ified i8259 is reverted from stable-1.0 tree (to restore live-migration
compatibility between the versions), would you expect problems?

thanks,

- Vasilis
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