On Sat, May 21, 2016 at 05:37:27PM +0200, Paolo Bonzini wrote:
>
>
> On 21/05/2016 01:40, Stefan Hajnoczi wrote:
> > while (req) {
> > qemu_put_sbyte(f, 1);
>
> Could you just put an extra 32-bit queue id here if num_queues > 1? A
> guest with num_queues > 1 cannot be started on pre-2.7 QEMU, so you can
> change the migration format (if virtio were using vmstate, it would be a
> VMSTATE_UINT32_TEST).That's a good point: the same command-line would not work on old QEMU so there is no possibility of new->old migration in the first place! Your solution is much simpler than my hack (which took me a long time to find and I was kind of proud of). Will change for v2. Stefan
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