This will be used in subsequent patches to access the XIVE associated to
a TCTX without reaching out to the machine through qdev_get_machine().
Signed-off-by: NCédric Le Goater <clg@kaod.org>
[ groug: - split patch
         - write subject and changelog ]
Signed-off-by: NGreg Kurz <groug@kaod.org>
Signed-off-by: NCédric Le Goater <clg@kaod.org>
Message-Id: <20200106145645.4539-9-clg@kaod.org>
Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>