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[Qemu-discuss] Should it be possible to live-migrate from 1.1.2 to 2.1.2

From: Brian Candler
Subject: [Qemu-discuss] Should it be possible to live-migrate from 1.1.2 to 2.1.2?
Date: Mon, 7 Nov 2016 21:43:53 +0000
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:45.0) Gecko/20100101 Thunderbird/45.4.0

I'm trying a live migration from Debian Wheezy (qemu 1.1.2) to Debian Jessie (qemu 2.1.2). My attempt didn't work, but is it supposed to?

At the sender, I started a simple kvm process:

# kvm -monitor stdio -vnc -M pc-1.1
QEMU 1.1.2 monitor - type 'help' for more information

At the receiver:

# kvm -monitor stdio -vnc -M pc-1.1 -incoming tcp:0:4444
QEMU 2.1.2 monitor - type 'help' for more information

Then at the sender:

(qemu) migrate -d tcp:
migrate: Connection can not be completed immediately

Receiver side shows:

(qemu) qemu-system-x86_64: Unknown ramblock "0000:00:03.0/rtl8139.rom", cannot accept migration
qemu-system-x86_64: Ack, bad migration stream!
qemu-system-x86_64: Illegal RAM offset 770632e62696000
qemu: warning: error while loading state for instance 0x0 of device 'ram'
qemu-system-x86_64: load of migration failed: Invalid argument

On the source machine, pc-1.1 is the latest available.

# kvm -machine help
Supported machines are:
pc                   Standard PC (alias of pc-1.1)
pc-1.1               Standard PC (default)
pc-1.0               Standard PC
pc-0.15              Standard PC
pc-0.14              Standard PC
pc-0.13              Standard PC
pc-0.12              Standard PC
pc-0.11              Standard PC, qemu 0.11
pc-0.10              Standard PC, qemu 0.10
isapc                ISA-only PC

Any clues?



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