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
