Re: [PATCH V3 11/16] migration: cpr-transfer mode

[Peter Xu <peterx@redhat.com>]

On Fri, Nov 01, 2024 at 06:47:50AM -0700, Steve Sistare wrote:
> Add the cpr-transfer migration mode.  Usage:
>   qemu-system-$arch -machine anon-alloc=memfd ...
> 
>   start new QEMU with "-incoming <uri-1> -cpr-uri <uri-2>"
> 
>   Issue commands to old QEMU:
>   migrate_set_parameter mode cpr-transfer
>   migrate_set_parameter cpr-uri <uri-2>
>   migrate -d <uri-1>

QMP command "migrate" already allows taking MigrationChannel lists, cpr can
be the 2nd supported channel besides "main".

I apologize on only noticing this until now.. I wished the incoming side
can do the same already (which also takes 'MigrationChannel') if monitors
init can be moved earlier, and if precreate worked out.  If not, we should
still consider doing that on source, because cpr-uri isn't usable on dest
anyway.. so they need to be treated separately even now.

Then after we make the monitor code run earlier in the future we could
introduce that to incoming side too, obsoleting -cpr-uri there.

-- 
Peter Xu