[Qemu-arm] aarch64 live migration failure between nodes with different CPU revisions

[Cosmin Smechea]

Hi,

Live migration fails between two connected aarch64 machines.

QEMU emulator version 2.9.0 is used on both of these nodes.

How to reproduce:

=== START ===

Start a VM on the designated source node.

Source: 

(qemu) migrate tcp:<TARGETIP>:49160 

Target: 

Warning: affinity is not specified for some (1) of the 1 smp cores. Will be using default mask 

qemu-system-aarch64: -chardev pty,id=charserial0,logfile=/root/qemu.log,logappend=on: char device redirected to /dev/pts/3 (label charserial0) 

qemu-system-aarch64: error while loading state for instance 0x0 of device 'cpu' 

qemu-system-aarch64: load of migration failed: Operation not permitted 

=== END ===

To note is that these two machines have different CPU revisions as shown by:

address@hidden:~# cat /proc/cpuinfo | grep 'CPU revision'

CPU revision : 1

address@hidden:~# cat /proc/cpuinfo | grep 'CPU revision'

CPU revision : 0

Between two nodes with the same CPU revision the live migration works as expected.

Is there any further planned support for aarch64 that may affect this issue?

Regards,

Cosmin