On Thu, May 23, 2013 at 04:51:17PM +0200, Paolo Bonzini wrote: > Il 23/05/2013 13:04, Michael S. Tsirkin ha scritto: > >> > Most current uses of pci_find_domain() are for error or informational > >> > messages, so the change in identifiers should be harmless. The exception > >> > is pci_get_dev_path(), whose results form part of migration streams. To > >> > maintain compatibility with old migration streams, the PIIX PCI host is > >> > altered to always supply "0000" for this path, which matches the old > >> > domain > >> > number (since the code didn't actually support domains other than 0). > >> > > >> > For the pseries (spapr) PCI bridge we use a different platform-unique > >> > identifier (pseries machines can routinely have dozens of PCI host > >> > bridges). Theoretically that breaks migration streams, but given that we > >> > don't yet have migration support for pseries, it doesn't matter. > >> > > >> > Any other machines that have working migration support including PCI > >> > devices will need to be updated to maintain migration stream > >> > compatibility. > >> > > >> > Signed-off-by: David Gibson <da...@gibson.dropbear.id.au> > > AFAIK PC is the only one with working migration, yes, but > > we have Q35 as well which can be migrated. > > Are we already supporting backwards/forwards migration with Q35? > > Paolo
We released 1.5 with Q35 so we better ...
