Re: [Qemu-devel] [PATCH] vmstate: Add unmigratable flag

[Jan Kiszka]

On 2011-06-09 22:00, Anthony Liguori wrote:
> On 06/09/2011 11:44 AM, Jan Kiszka wrote:
>> A first step towards getting rid of register_device_unmigratable
>> (ivshmem and lacking vmstate support in virtio are blocking this):
>>
>> Allow to register an unmigratable vmstate via qdev, i.e. tag a device
>> declaratively.
> 
> I thought part of the problem with this was that for some devices (like
> ivshmem), whether it can be migrated was dynamic.  It depends on
> configuration, state, etc.

That only applies to ivshmem (the other user is device assignment which
is unconditionally unmigratable). And the ivshmem issue could easily be
solved by defining two devices, ivshmem-peer (or just ivshmem) and
ivshmem-master, eliminating the need for the role property.

I don't think there will ever be a use case for a "transformer" device
that becomes unmigratable during runtime (would be a nightmare for
management apps anyway).

If breaking the user interface of ivshmem for this is OK, I'll post a patch.

Jan

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