[Spice-devel] migration and qemu/spice versions
Gerd Hoffmann
kraxel at redhat.com
Tue Sep 6 03:03:28 PDT 2011
On 09/06/11 11:54, Yonit Halperin wrote:
> Hi,
> I'm working on the changes discussed in the thread "changing the timing
> of spice client linking in migration (RHBZ #725009)".
> In order to be backward compatible with respect to spice-server and qemu
> we need
> (1) new qemu calling the old switch_host if the server is old (instead
> of spice_server_migrate_end)
New qemu can just call spice_server_migrate_start() and check the return
value. If it succeeds just go on with seamless migration, otherwise
(return value < 0) fallback to switch-host.
> (2) new spice-server using the old switch host (and not the new
> migration mechanism) if qemu is old.
Old qemu which can't handle seamless migration will never ever call
spice_server_migrate_start().
cheers,
Gerd
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